bluetooth: Add hci_h4p driver

Commit Message

Pavel Machek Dec. 13, 2014, 10:37 p.m. UTC

Add hci_h4p bluetooth driver to staging tree. This device is used
for example on Nokia N900 cell phone.

Signed-off-by: Pavel Machek <[e-mail]>
Thanks-to: Sebastian Reichel <[e-mail]>
Thanks-to: Joe Perches <[e-mail]>

---


I'd prefer to resurect the driver in staging/ in order not to lose
history, but Marcel wanted to treat it as new submission, so I'm doing
that.

Firmware load was converted to hci_cmd_sync(). Unfortunately, the
firmware is needed after every open/close, so the setup mechanism does
not quite fit. (But code is now way cleaner).

Device tree bindings work for me, but they are not yet official and I
expect some more fun there.

Hacks surrounding bluetooth address were removed; this results in
working driver with address that is probably not unique.

HCI_QUIRK_RESET_ON_CLOSE will need to be investigated some more.

My notes say that Marcel wanted different filenames, but I'd need
advice exactly what filenames. I guess platform data supprort should
be removed altogether, rather than renamed.

Thanks,
								Pavel

Comments

Marcel Holtmann Dec. 13, 2014, 11:30 p.m. UTC | #1

Hi Pavel,

> Add hci_h4p bluetooth driver to staging tree. This device is used
> for example on Nokia N900 cell phone.
> 
> Signed-off-by: Pavel Machek <[e-mail]>
> Thanks-to: Sebastian Reichel <[e-mail]>
> Thanks-to: Joe Perches <[e-mail]>
> 
> ---
> 
> 
> I'd prefer to resurect the driver in staging/ in order not to lose
> history, but Marcel wanted to treat it as new submission, so I'm doing
> that.

that history is in linux.git now for all times. No need to repeat it. I rather not play around with that again. Lets get a minimal driver merged so we can give people something to improve.

> 
> Firmware load was converted to hci_cmd_sync(). Unfortunately, the
> firmware is needed after every open/close, so the setup mechanism does
> not quite fit. (But code is now way cleaner).

What is the reason for that? Does it mean that the device will always loose all its settings when powering it down. Do we know why that is that way and can we maybe change it?

If there is no way around this, we can introduce a quirk that will always run hdev->setup. However if the device keeps forgetting all settings all the time, that means it will also keep forgetting its address. So that power on procedure will be wasting time. We would need to check if we can make it so that it only has unconfigured state once and then keeps remembering the address even if we have to re-program it every time.

> Device tree bindings work for me, but they are not yet official and I
> expect some more fun there.
> 
> Hacks surrounding bluetooth address were removed; this results in
> working driver with address that is probably not unique.

Just set HCI_QUIRK_INVALID_BDADDR and let someone deal with that in userspace. You can use the btmgmt public-addr command for testing.

In the end someone needs to write a small tool that users mgmt interface and listens for unconfigured controllers, reads the address from whatever storage it is, uses the Set Public Address command and that is it.

On the kernel side you need to add hdev->set_bdaddr support. For the Broadcom based devices you can copy it from the btusb.c driver.

> HCI_QUIRK_RESET_ON_CLOSE will need to be investigated some more.

Why was that needed again? If the device loses power anyway, then that seems wasteful. Also the core changed to make sure it resets all settings on power down correctly.

> My notes say that Marcel wanted different filenames, but I'd need
> advice exactly what filenames. I guess platform data supprort should
> be removed altogether, rather than renamed.

Yes, the platform support should go away. This should be purely based on DT.

Can you also start using git format-patch so that patches get a diffstat.

Regards

Marcel

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Pavel Machek Dec. 13, 2014, 11:51 p.m. UTC | #2

Hi!

> > My notes say that Marcel wanted different filenames, but I'd need
> > advice exactly what filenames. I guess platform data supprort should
> > be removed altogether, rather than renamed.
> 
> Yes, the platform support should go away. This should be purely based on DT.
> 
> Can you also start using git format-patch so that patches get a diffstat.

So the rest of filenames look ok?
									Pavel

Marcel Holtmann Dec. 14, 2014, 12:07 a.m. UTC | #3

Hi Pavel,

>>> My notes say that Marcel wanted different filenames, but I'd need
>>> advice exactly what filenames. I guess platform data supprort should
>>> be removed altogether, rather than renamed.
>> 
>> Yes, the platform support should go away. This should be purely based on DT.
>> 
>> Can you also start using git format-patch so that patches get a diffstat.
> 
> So the rest of filenames look ok?

I have not looked at the patch or the filenames at all.

Regards

Marcel


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Pavel Machek Dec. 14, 2014, 9:47 a.m. UTC | #4

On Sun 2014-12-14 01:07:42, Marcel Holtmann wrote:
> Hi Pavel,
> 
> >>> My notes say that Marcel wanted different filenames, but I'd need
> >>> advice exactly what filenames. I guess platform data supprort should
> >>> be removed altogether, rather than renamed.
> >> 
> >> Yes, the platform support should go away. This should be purely based on DT.
> >> 
> >> Can you also start using git format-patch so that patches get a diffstat.
> > 
> > So the rest of filenames look ok?
> 
> I have not looked at the patch or the filenames at all.

Ok, so here's diffstat. Can you take a look?

Thanks,
									Pavel

 drivers/bluetooth/Kconfig                  |   10 
 drivers/bluetooth/Makefile                 |    3 
 drivers/bluetooth/hci_h4p.h                |  234 +++++
 drivers/bluetooth/nokia_core.c             | 1262 +++++++++++++++++++++++++++++
 drivers/bluetooth/nokia_fw-bcm.c           |   27 
 drivers/bluetooth/nokia_fw.c               |  105 ++
 drivers/bluetooth/nokia_uart.c             |  179 ++++
 include/linux/platform_data/bt-nokia-h4p.h |    4 
 8 files changed, 1822 insertions(+), 2 deletions(-)

Pavel Machek Dec. 14, 2014, 10:40 a.m. UTC | #5

On Sun 2014-12-14 00:30:13, Marcel Holtmann wrote:
> Hi Pavel,
> 
> > Add hci_h4p bluetooth driver to staging tree. This device is used
> > for example on Nokia N900 cell phone.
> > 
> > Signed-off-by: Pavel Machek <[e-mail]>
> > Thanks-to: Sebastian Reichel <[e-mail]>
> > Thanks-to: Joe Perches <[e-mail]>
> > 
> > ---
> > 
> > 
> > I'd prefer to resurect the driver in staging/ in order not to lose
> > history, but Marcel wanted to treat it as new submission, so I'm doing
> > that.
> 
> that history is in linux.git now for all times. No need to repeat it. I rather not play around with that again. Lets get a minimal driver merged so we can give people something to improve.
>

We will merge minimum version. Still I'd like complete history for
credits and bisect and easy ability to diff original and minimum
version.

> > Firmware load was converted to hci_cmd_sync(). Unfortunately, the
> > firmware is needed after every open/close, so the setup mechanism does
> > not quite fit. (But code is now way cleaner).
> 
> What is the reason for that? Does it mean that the device will always loose all its settings when powering it down. Do we know why that is that way and can we maybe change it?
> 
> If there is no way around this, we can introduce a quirk that will always run hdev->setup. However if the device keeps forgetting all settings all the time, that means it will also keep forgetting its address. So that power on procedure will be wasting time. We would need to check if we can make it so that it only has unconfigured state once and then keeps remembering the address even if we have to re-program it every time.
> 
> > Device tree bindings work for me, but they are not yet official and I
> > expect some more fun there.
> > 
> > Hacks surrounding bluetooth address were removed; this results in
> > working driver with address that is probably not unique.
> 
> Just set HCI_QUIRK_INVALID_BDADDR and let someone deal with that in
> userspace. You can use the btmgmt public-addr command for testing.

What command would that be? Do I need some new versions of tools?

root@n900:/my/modules# man hciconfig
(don't see anything relevant).
root@n900:/my/modules# btmgmt
-bash: btmgmt: command not found
root@n900:/my/modules# apt-cache search btmgmt
root@n900:/my/modules#

> On the kernel side you need to add hdev->set_bdaddr support. For the Broadcom based devices you can copy it from the btusb.c driver.
> 

I tried doing that from setup, but either command failed or it killed
hte kernel. 

> > HCI_QUIRK_RESET_ON_CLOSE will need to be investigated some more.
> 
> Why was that needed again? If the device loses power anyway, then that seems wasteful. Also the core changed to make sure it resets all settings on power down correctly.
>

Ok.

> > My notes say that Marcel wanted different filenames, but I'd need
> > advice exactly what filenames. I guess platform data supprort should
> > be removed altogether, rather than renamed.
> 
> Yes, the platform support should go away. This should be purely based on DT.
> 
> Can you also start using git format-patch so that patches get a diffstat.

I can do diffstat manually for you, git format-patch does not fit my
workflow.

Thanks,
								Pavel

Pavel Machek Dec. 14, 2014, 11:16 a.m. UTC | #6

On Sun 2014-12-14 00:30:13, Marcel Holtmann wrote:
> Hi Pavel,
> 
> > Add hci_h4p bluetooth driver to staging tree. This device is used
> > for example on Nokia N900 cell phone.
> > 
> > Signed-off-by: Pavel Machek <[e-mail]>
> > Thanks-to: Sebastian Reichel <[e-mail]>
> > Thanks-to: Joe Perches <[e-mail]>
> > 
> > ---
> > 
> > 
> > I'd prefer to resurect the driver in staging/ in order not to lose
> > history, but Marcel wanted to treat it as new submission, so I'm doing
> > that.
> 
> that history is in linux.git now for all times. No need to repeat it. I rather not play around with that again. Lets get a minimal driver merged so we can give people something to improve.
> 
> > 
> > Firmware load was converted to hci_cmd_sync(). Unfortunately, the
> > firmware is needed after every open/close, so the setup mechanism does
> > not quite fit. (But code is now way cleaner).
> 
> What is the reason for that? Does it mean that the device will always loose all its settings when powering it down. Do we know why that is that way and can we maybe change it?
> 
> If there is no way around this, we can introduce a quirk that will always run hdev->setup. However if the device keeps forgetting all settings all the time, that means it will also keep forgetting its address. So that power on procedure will be wasting time. We would need to check if we can make it so that it only has unconfigured state once and then keeps remembering the address even if we have to re-program it every time.
> 
> > Device tree bindings work for me, but they are not yet official and I
> > expect some more fun there.
> > 
> > Hacks surrounding bluetooth address were removed; this results in
> > working driver with address that is probably not unique.
> 
> Just set HCI_QUIRK_INVALID_BDADDR and let someone deal with that in
>userspace. You can use the btmgmt public-addr command for testing.

Hmm. So I installed bluez-5.36, then libudev-dev, then libical-dev,
libreadline-dev. I'm glad I have debian and not maemo, and nfsroot and
not limited flash.  I had to turn off systemd support.

It still compiles..
								Pavel

Pavel Machek Dec. 14, 2014, 9:52 p.m. UTC | #7

Hi!

> > Firmware load was converted to hci_cmd_sync(). Unfortunately, the
> > firmware is needed after every open/close, so the setup mechanism does
> > not quite fit. (But code is now way cleaner).
> 
> What is the reason for that? Does it mean that the device will always loose all its settings when powering it down. Do we know why that is that way and can we maybe change it?
>

Well, on hci_close(), original code asserts reset GPIO. I guess that
clears everything... I got it working with that removed, and it means
I can set the address the normal way. What are implications for power
consumption... I'm not sure at this point. Lets worry about that
later.
									Pavel

Oliver Neukum Dec. 15, 2014, 10:01 a.m. UTC | #8

Hi,

a few remarks about possible issues.

	Regards
		Oliver

> +static int h4p_send_negotiation(struct h4p_info *info)
> +{
> +	struct h4p_neg_cmd *neg_cmd;
> +	struct h4p_neg_hdr *neg_hdr;
> +	struct sk_buff *skb;
> +	int err, len;
> +	u16 sysclk = 38400;
> +
> +	printk("Sending negotiation..");
> +	len = sizeof(*neg_cmd) + sizeof(*neg_hdr) + H4_TYPE_SIZE;
> +
> +	skb = bt_skb_alloc(len, GFP_KERNEL);
> +	if (!skb)
> +		return -ENOMEM;
> +
> +	memset(skb->data, 0x00, len);
> +	*skb_put(skb, 1) = H4_NEG_PKT;
> +	neg_hdr = (struct h4p_neg_hdr *)skb_put(skb, sizeof(*neg_hdr));
> +	neg_cmd = (struct h4p_neg_cmd *)skb_put(skb, sizeof(*neg_cmd));
> +
> +	neg_hdr->dlen = sizeof(*neg_cmd);
> +	neg_cmd->ack = H4P_NEG_REQ;
> +	neg_cmd->baud = cpu_to_le16(BT_BAUDRATE_DIVIDER/MAX_BAUD_RATE);
> +	neg_cmd->proto = H4P_PROTO_BYTE;
> +	neg_cmd->sys_clk = cpu_to_le16(sysclk);
> +
> +	h4p_change_speed(info, INIT_SPEED);
> +
> +	h4p_set_rts(info, 1);
> +	info->init_error = 0;
> +	init_completion(&info->init_completion);
> +
> +	h4p_simple_send_frame(info, skb);
> +
> +	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> +						       msecs_to_jiffies(1000))) {
> +		printk("h4p: negotiation did not return\n");

Memory leak in the error case

> +		return -ETIMEDOUT;
> +	}
> +
> +	if (info->init_error < 0)
> +		return info->init_error;
> +
> +	/* Change to operational settings */
> +	h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
> +	h4p_set_rts(info, 0);
> +	h4p_change_speed(info, MAX_BAUD_RATE);
> +
> +	err = h4p_wait_for_cts(info, 1, 100);
> +	if (err < 0)
> +		return err;
> +
> +	h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
> +	init_completion(&info->init_completion);
> +	err = h4p_send_alive_packet(info);
> +
> +	if (err < 0)
> +		return err;
> +
> +	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> +				msecs_to_jiffies(1000)))
> +		return -ETIMEDOUT;
> +
> +	if (info->init_error < 0)
> +		return info->init_error;
> +
> +	printk("Negotiation successful\n");
> +	return 0;
> +}



> +static unsigned int h4p_get_data_len(struct h4p_info *info,
> +					 struct sk_buff *skb)
> +{
> +	long retval = -1;
> +	struct hci_acl_hdr *acl_hdr;
> +	struct hci_sco_hdr *sco_hdr;
> +	struct hci_event_hdr *evt_hdr;
> +	struct h4p_neg_hdr *neg_hdr;
> +	struct h4p_alive_hdr *alive_hdr;
> +	struct h4p_radio_hdr *radio_hdr;
> +
> +	switch (bt_cb(skb)->pkt_type) {
> +	case H4_EVT_PKT:
> +		evt_hdr = (struct hci_event_hdr *)skb->data;
> +		retval = evt_hdr->plen;
> +		break;
> +	case H4_ACL_PKT:
> +		acl_hdr = (struct hci_acl_hdr *)skb->data;
> +		retval = le16_to_cpu(acl_hdr->dlen);

Could you explain, why only this needs endianness converted?

> +		break;
> +	case H4_SCO_PKT:
> +		sco_hdr = (struct hci_sco_hdr *)skb->data;
> +		retval = sco_hdr->dlen;
> +		break;
> +	case H4_RADIO_PKT:
> +		radio_hdr = (struct h4p_radio_hdr *)skb->data;
> +		retval = radio_hdr->dlen;
> +		break;
> +	case H4_NEG_PKT:
> +		neg_hdr = (struct h4p_neg_hdr *)skb->data;
> +		retval = neg_hdr->dlen;
> +		break;
> +	case H4_ALIVE_PKT:
> +		alive_hdr = (struct h4p_alive_hdr *)skb->data;
> +		retval = alive_hdr->dlen;
> +		break;
> +	}
> +
> +	return retval;
> +}



> +static void h4p_rx_tasklet(unsigned long data)
> +{
> +	u8 byte;
> +	struct h4p_info *info = (struct h4p_info *)data;
> +
> +	BT_DBG("tasklet woke up");
> +	BT_DBG("rx_tasklet woke up");

Isn't this a bit redundant?

> +
> +	while (h4p_inb(info, UART_LSR) & UART_LSR_DR) {
> +		byte = h4p_inb(info, UART_RX);
> +		BT_DBG("[in: %02x]", byte);
> +		if (info->garbage_bytes) {
> +			info->garbage_bytes--;
> +			continue;
> +		}
> +		if (info->rx_skb == NULL) {
> +			info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
> +						    GFP_ATOMIC | GFP_DMA);
> +			if (!info->rx_skb) {
> +				dev_err(info->dev,
> +					"No memory for new packet\n");
> +				goto finish_rx;
> +			}
> +			info->rx_state = WAIT_FOR_PKT_TYPE;
> +			info->rx_skb->dev = (void *)info->hdev;
> +		}
> +		info->hdev->stat.byte_rx++;
> +		h4p_handle_byte(info, byte);
> +	}
> +
> +	if (!info->rx_enabled) {
> +		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT &&
> +						  info->autorts) {
> +			__h4p_set_auto_ctsrts(info, 0 , UART_EFR_RTS);
> +			info->autorts = 0;
> +		}
> +		/* Flush posted write to avoid spurious interrupts */
> +		h4p_inb(info, UART_OMAP_SCR);
> +		h4p_set_clk(info, &info->rx_clocks_en, 0);
> +	}
> +
> +finish_rx:
> +	BT_DBG("rx_ended");
> +}
> +
> +static void h4p_tx_tasklet(unsigned long data)
> +{
> +	unsigned int sent = 0;
> +	struct sk_buff *skb;
> +	struct h4p_info *info = (struct h4p_info *)data;
> +
> +	BT_DBG("tasklet woke up");
> +	BT_DBG("tx_tasklet woke up");

Doubled?

> +	if (info->autorts != info->rx_enabled) {
> +		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
> +			if (info->autorts && !info->rx_enabled) {
> +				__h4p_set_auto_ctsrts(info, 0,
> +							  UART_EFR_RTS);
> +				info->autorts = 0;
> +			}
> +			if (!info->autorts && info->rx_enabled) {
> +				__h4p_set_auto_ctsrts(info, 1,
> +							  UART_EFR_RTS);
> +				info->autorts = 1;
> +			}
> +		} else {
> +			h4p_outb(info, UART_OMAP_SCR,
> +				     h4p_inb(info, UART_OMAP_SCR) |
> +				     UART_OMAP_SCR_EMPTY_THR);
> +			goto finish_tx;
> +		}
> +	}
> +
> +	skb = skb_dequeue(&info->txq);
> +	if (!skb) {
> +		/* No data in buffer */
> +		BT_DBG("skb ready");
> +		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
> +			h4p_outb(info, UART_IER,
> +				     h4p_inb(info, UART_IER) &
> +				     ~UART_IER_THRI);
> +			h4p_inb(info, UART_OMAP_SCR);
> +			h4p_disable_tx(info);
> +			return;
> +		}
> +		h4p_outb(info, UART_OMAP_SCR,
> +			     h4p_inb(info, UART_OMAP_SCR) |
> +			     UART_OMAP_SCR_EMPTY_THR);
> +		goto finish_tx;
> +	}
> +
> +	/* Copy data to tx fifo */
> +	while (!(h4p_inb(info, UART_OMAP_SSR) & UART_OMAP_SSR_TXFULL) &&
> +	       (sent < skb->len)) {
> +		//printk("[Out: %02x]", skb->data[sent]);
> +		//printk("%02x ", skb->data[sent]);
> +		h4p_outb(info, UART_TX, skb->data[sent]);
> +		sent++;
> +	}
> +
> +	info->hdev->stat.byte_tx += sent;
> +	if (skb->len == sent) {
> +		kfree_skb(skb);
> +	} else {
> +		skb_pull(skb, sent);
> +		skb_queue_head(&info->txq, skb);
> +	}
> +
> +	h4p_outb(info, UART_OMAP_SCR, h4p_inb(info, UART_OMAP_SCR) &
> +						     ~UART_OMAP_SCR_EMPTY_THR);
> +	h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
> +						 UART_IER_THRI);
> +
> +finish_tx:
> +	/* Flush posted write to avoid spurious interrupts */
> +	h4p_inb(info, UART_OMAP_SCR);
> +
> +}



















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Marcel Holtmann Dec. 15, 2014, 12:10 p.m. UTC | #9

Hi Pavel,

> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index 4547dc2..0fc7d3a 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -243,4 +243,14 @@ config BT_WILINK
> 	  Say Y here to compile support for Texas Instrument's WiLink7 driver
> 	  into the kernel or say M to compile it as module (btwilink).
> 
> +config BT_NOKIA_H4P
> +	tristate "HCI driver with H4 Nokia extensions"
> +	depends on ARCH_OMAP

this dependency needs to go away. The actual loading and detection of the driver should purely be based on DT. All OMAP specific details should not really be part of the Bluetooth driver.

> +	help
> +	  Bluetooth HCI driver with H4 extensions.  This driver provides
> +	  support for H4+ Bluetooth chip with vendor-specific H4 extensions.
> +
> +	  Say Y here to compile support for h4 extended devices into the kernel
> +	  or say M to compile it as module (btnokia_h4p).
> +
> endmenu
> diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> index 9fe8a87..ec7074fe 100644
> --- a/drivers/bluetooth/Makefile
> +++ b/drivers/bluetooth/Makefile
> @@ -31,4 +31,7 @@ hci_uart-$(CONFIG_BT_HCIUART_ATH3K)	+= hci_ath.o
> hci_uart-$(CONFIG_BT_HCIUART_3WIRE)	+= hci_h5.o
> hci_uart-objs				:= $(hci_uart-y)
> 
> +obj-$(CONFIG_BT_NOKIA_H4P)      += hci_h4p.o
> +hci_h4p-objs := nokia_core.o nokia_fw.o nokia_uart.o
> +

We are moving away from calling drivers hci_ since that is a bit too generic. Just call the the driver object nokia_h4p.o for now.

> ccflags-y += -D__CHECK_ENDIAN__
> new file mode 100644
> index 0000000..6445a99
> --- /dev/null
> +++ b/drivers/bluetooth/hci_h4p.h

this should be nokia_h4p.h then.

> @@ -0,0 +1,234 @@
> +/*
> + * This file is part of Nokia H4P bluetooth driver
> + *
> + * Copyright (C) 2005-2008 Nokia Corporation.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#ifndef __DRIVERS_BLUETOOTH_H4P_H
> +#define __DRIVERS_BLUETOOTH_H4P_H

Skip these circular inclusion protection checks. The header file is local and you know what you are doing.

> +
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <net/bluetooth/hci.h>
> +
> +#include <linux/serial_reg.h>
> +
> +#define UART_SYSC_OMAP_RESET	0x03
> +#define UART_SYSS_RESETDONE	0x01
> +#define UART_OMAP_SCR_EMPTY_THR	0x08
> +#define UART_OMAP_SCR_WAKEUP	0x10
> +#define UART_OMAP_SSR_WAKEUP	0x02
> +#define UART_OMAP_SSR_TXFULL	0x01
> +
> +#define UART_OMAP_SYSC_IDLEMODE		0x03
> +#define UART_OMAP_SYSC_IDLEMASK		(3 << UART_OMAP_SYSC_IDLEMODE)
> +
> +#define UART_OMAP_SYSC_FORCE_IDLE	(0 << UART_OMAP_SYSC_IDLEMODE)
> +#define UART_OMAP_SYSC_NO_IDLE		(1 << UART_OMAP_SYSC_IDLEMODE)
> +#define UART_OMAP_SYSC_SMART_IDLE	(2 << UART_OMAP_SYSC_IDLEMODE)
> +
> +#define H4P_TRANSFER_MODE		1
> +#define H4P_SCHED_TRANSFER_MODE		2
> +#define H4P_ACTIVE_MODE			3
> +
> +struct h4p_info {
> +	struct timer_list lazy_release;
> +	struct hci_dev *hdev;
> +	spinlock_t lock;
> +
> +	void __iomem *uart_base;
> +	unsigned long uart_phys_base;
> +	int irq;
> +	struct device *dev;
> +	u8 chip_type;
> +	u8 bt_wakeup_gpio;
> +	u8 host_wakeup_gpio;
> +	u8 reset_gpio;
> +	u8 reset_gpio_shared;
> +	u8 bt_sysclk;
> +	u8 man_id;
> +	u8 ver_id;
> +
> +	struct sk_buff_head fw_queue;
> +	struct sk_buff *alive_cmd_skb;
> +	struct completion init_completion;
> +	struct completion fw_completion;
> +	struct completion test_completion;
> +	int fw_error;
> +	int init_error;
> +
> +	struct sk_buff_head txq;
> +
> +	struct sk_buff *rx_skb;
> +	long rx_count;
> +	unsigned long rx_state;
> +	unsigned long garbage_bytes;
> +
> +	bdaddr_t bd_addr;

Remove this one. Let the core handle any BD_ADDR related details.

> +	struct sk_buff_head *fw_q;
> +
> +	int pm_enabled;
> +	int tx_enabled;
> +	int autorts;
> +	int rx_enabled;
> +	unsigned long pm_flags;
> +
> +	int tx_clocks_en;
> +	int rx_clocks_en;
> +	spinlock_t clocks_lock;
> +	struct clk *uart_iclk;
> +	struct clk *uart_fclk;
> +	atomic_t clk_users;
> +	u16 dll;
> +	u16 dlh;
> +	u16 ier;
> +	u16 mdr1;
> +	u16 efr;
> +
> +	int initing;
> +};
> +
> +struct h4p_radio_hdr {
> +	u8 evt;
> +	u8 dlen;
> +} __packed;
> +
> +struct h4p_neg_hdr {
> +	u8 dlen;
> +} __packed;
> +#define H4P_NEG_HDR_SIZE 1
> +
> +#define H4P_NEG_REQ	0x00
> +#define H4P_NEG_ACK	0x20
> +#define H4P_NEG_NAK	0x40
> +
> +#define H4P_PROTO_PKT	0x44
> +#define H4P_PROTO_BYTE	0x4c
> +
> +#define H4P_ID_CSR	0x02
> +#define H4P_ID_BCM2048	0x04
> +#define H4P_ID_TI1271	0x31
> +
> +struct h4p_neg_cmd {
> +	u8	ack;
> +	u16	baud;
> +	u16	unused1;
> +	u8	proto;
> +	u16	sys_clk;
> +	u16	unused2;
> +} __packed;
> +
> +struct h4p_neg_evt {
> +	u8	ack;
> +	u16	baud;
> +	u16	unused1;
> +	u8	proto;
> +	u16	sys_clk;
> +	u16	unused2;
> +	u8	man_id;
> +	u8	ver_id;
> +} __packed;
> +
> +#define H4P_ALIVE_REQ	0x55
> +#define H4P_ALIVE_RESP	0xcc
> +
> +struct h4p_alive_hdr {
> +	u8	dlen;
> +} __packed;
> +#define H4P_ALIVE_HDR_SIZE 1
> +
> +struct h4p_alive_pkt {
> +	u8	mid;
> +	u8	unused;
> +} __packed;
> +
> +#define MAX_BAUD_RATE		921600
> +#define BC4_MAX_BAUD_RATE	3692300
> +#define UART_CLOCK		48000000
> +#define BT_INIT_DIVIDER		320
> +#define BT_BAUDRATE_DIVIDER	384000000
> +#define BT_SYSCLK_DIV		1000
> +#define INIT_SPEED		120000
> +
> +#define H4_TYPE_SIZE		1
> +#define H4_RADIO_HDR_SIZE	2
> +
> +/* H4+ packet types */
> +#define H4_CMD_PKT		0x01
> +#define H4_ACL_PKT		0x02
> +#define H4_SCO_PKT		0x03
> +#define H4_EVT_PKT		0x04
> +#define H4_NEG_PKT		0x06
> +#define H4_ALIVE_PKT		0x07
> +#define H4_RADIO_PKT		0x08
> +
> +/* TX states */
> +#define WAIT_FOR_PKT_TYPE	1
> +#define WAIT_FOR_HEADER		2
> +#define WAIT_FOR_DATA		3
> +
> +struct hci_fw_event {
> +	struct hci_event_hdr hev;
> +	struct hci_ev_cmd_complete cmd;
> +	u8 status;
> +} __packed;
> +
> +void h4p_simple_send_frame(struct h4p_info *info, struct sk_buff *skb);
> +
> +int h4p_send_alive_packet(struct h4p_info *info);
> +
> +int h4p_read_fw(struct h4p_info *info);
> +int h4p_send_fw(struct h4p_info *info);
> +void h4p_parse_fw_event(struct h4p_info *info, struct sk_buff *skb);
> +
> +static inline void h4p_outb(struct h4p_info *info, unsigned int offset, u8 val)
> +{
> +	__raw_writeb(val, info->uart_base + (offset << 2));
> +}
> +
> +static inline u8 h4p_inb(struct h4p_info *info, unsigned int offset)
> +{
> +	u8 val;
> +	val = __raw_readb(info->uart_base + (offset << 2));
> +	return val;
> +}
> +
> +static inline void h4p_set_rts(struct h4p_info *info, int active)
> +{
> +	u8 b;
> +
> +	b = h4p_inb(info, UART_MCR);
> +	if (active)
> +		b |= UART_MCR_RTS;
> +	else
> +		b &= ~UART_MCR_RTS;
> +	h4p_outb(info, UART_MCR, b);
> +}
> +
> +int h4p_wait_for_cts(struct h4p_info *info, int active, int timeout_ms);
> +void __h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which);
> +void h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which);
> +void h4p_change_speed(struct h4p_info *info, unsigned long speed);
> +int h4p_reset_uart(struct h4p_info *info);
> +void h4p_init_uart(struct h4p_info *info);
> +void h4p_enable_tx(struct h4p_info *info);
> +void h4p_store_regs(struct h4p_info *info);
> +void h4p_restore_regs(struct h4p_info *info);
> +void h4p_smart_idle(struct h4p_info *info, bool enable);
> +
> +#endif /* __DRIVERS_BLUETOOTH_H4P_H */
> diff --git a/drivers/bluetooth/nokia_core.c b/drivers/bluetooth/nokia_core.c
> new file mode 100644
> index 0000000..ca9746d
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_core.c
> @@ -0,0 +1,1262 @@
> +/*
> + * This file is part of Nokia H4P bluetooth driver
> + *
> + * Copyright (C) 2005-2008 Nokia Corporation.
> + * Copyright (C) 2014 Pavel Machek <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + * Thanks to all the Nokia people that helped with this driver,
> + * including Ville Tervo and Roger Quadros.
> + *
> + * Power saving functionality was removed from this driver to make
> + * merging easier.
> + */
> +
> +/*
> +insmod hci_h4p.ko && hciconfig hci0 up && hcitool inq && hciconfig hci0 down && hciconfig hci0 up && hcitool inq && rmmod hci_h4p
> +
> +*/

This command should not be in the source.

> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/errno.h>
> +#include <linux/delay.h>
> +#include <linux/spinlock.h>
> +#include <linux/serial_reg.h>
> +#include <linux/skbuff.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/interrupt.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_irq.h>
> +#include <linux/timer.h>
> +#include <linux/kthread.h>
> +#include <linux/io.h>
> +#include <linux/completion.h>
> +#include <linux/sizes.h>
> +
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <net/bluetooth/hci.h>
> +
> +#include <linux/platform_data/bt-nokia-h4p.h>

We need to move towards DT and not platform data.

> +
> +#include "hci_h4p.h"
> +
> +#define BT_DBG(a...) do {} while(0)

Why is this needed? BT_DBG is hooked up with dynamic debug.

> +
> +/* This should be used in function that cannot release clocks */
> +static void h4p_set_clk(struct h4p_info *info, int *clock, int enable)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&info->clocks_lock, flags);
> +	if (enable && !*clock) {
> +		BT_DBG("Enabling %p", clock);
> +		clk_prepare_enable(info->uart_fclk);
> +		clk_prepare_enable(info->uart_iclk);
> +		if (atomic_read(&info->clk_users) == 0)
> +			h4p_restore_regs(info);
> +		atomic_inc(&info->clk_users);
> +	}
> +
> +	if (!enable && *clock) {
> +		BT_DBG("Disabling %p", clock);
> +		if (atomic_dec_and_test(&info->clk_users))
> +			h4p_store_regs(info);
> +		clk_disable_unprepare(info->uart_fclk);
> +		clk_disable_unprepare(info->uart_iclk);
> +	}
> +
> +	*clock = enable;
> +	spin_unlock_irqrestore(&info->clocks_lock, flags);
> +}
> +
> +static void h4p_lazy_clock_release(unsigned long data)
> +{
> +	struct h4p_info *info = (struct h4p_info *)data;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&info->lock, flags);
> +	if (!info->tx_enabled)
> +		h4p_set_clk(info, &info->tx_clocks_en, 0);
> +	spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +/* Power management functions */
> +void h4p_smart_idle(struct h4p_info *info, bool enable)
> +{
> +	u8 v;
> +
> +	v = h4p_inb(info, UART_OMAP_SYSC);
> +	v &= ~(UART_OMAP_SYSC_IDLEMASK);
> +
> +	if (enable)
> +		v |= UART_OMAP_SYSC_SMART_IDLE;
> +	else
> +		v |= UART_OMAP_SYSC_NO_IDLE;
> +
> +	h4p_outb(info, UART_OMAP_SYSC, v);
> +}
> +
> +static inline void h4p_schedule_pm(struct h4p_info *info)
> +{
> +}
> +
> +static void h4p_disable_tx(struct h4p_info *info)
> +{
> +	if (!info->pm_enabled)
> +		return;
> +
> +	/* Re-enable smart-idle */
> +	h4p_smart_idle(info, 1);
> +
> +	gpio_set_value(info->bt_wakeup_gpio, 0);
> +	mod_timer(&info->lazy_release, jiffies + msecs_to_jiffies(100));
> +	info->tx_enabled = 0;
> +}
> +
> +void h4p_enable_tx_nopm(struct h4p_info *info)
> +{
> +	unsigned long flags;
> +	
> +	spin_lock_irqsave(&info->lock, flags);
> +	h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
> +		     UART_IER_THRI);
> +	spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +void h4p_enable_tx(struct h4p_info *info)
> +{
> +	unsigned long flags;
> +
> +	if (!info->pm_enabled)
> +		return;
> +
> +	h4p_schedule_pm(info);
> +
> +	spin_lock_irqsave(&info->lock, flags);
> +	del_timer(&info->lazy_release);
> +	h4p_set_clk(info, &info->tx_clocks_en, 1);
> +	info->tx_enabled = 1;
> +	gpio_set_value(info->bt_wakeup_gpio, 1);
> +	h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
> +		     UART_IER_THRI);
> +	/*
> +	 * Disable smart-idle as UART TX interrupts
> +	 * are not wake-up capable
> +	 */
> +	h4p_smart_idle(info, 0);
> +
> +	spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +static void h4p_disable_rx(struct h4p_info *info)
> +{
> +	if (!info->pm_enabled)
> +		return;
> +
> +	info->rx_enabled = 0;
> +
> +	if (h4p_inb(info, UART_LSR) & UART_LSR_DR)
> +		return;
> +
> +	if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
> +		return;
> +
> +	__h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
> +	info->autorts = 0;
> +	h4p_set_clk(info, &info->rx_clocks_en, 0);
> +}
> +
> +static void h4p_enable_rx(struct h4p_info *info)
> +{
> +	if (!info->pm_enabled)
> +		return;
> +
> +	h4p_schedule_pm(info);
> +
> +	h4p_set_clk(info, &info->rx_clocks_en, 1);
> +	info->rx_enabled = 1;
> +
> +	if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
> +		return;
> +
> +	__h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
> +	info->autorts = 1;
> +}
> +
> +void h4p_simple_send_frame(struct h4p_info *info, struct sk_buff *skb)
> +{
> +	skb_queue_tail(&info->txq, skb);
> +	h4p_enable_tx_nopm(info);
> +}
> +
> +/* Negotiation functions */
> +int h4p_send_alive_packet(struct h4p_info *info)
> +{
> +	struct h4p_alive_hdr *hdr;
> +	struct h4p_alive_pkt *pkt;
> +	struct sk_buff *skb;
> +	int len;
> +
> +	BT_DBG("Sending alive packet");
> +
> +	len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt);
> +	skb = bt_skb_alloc(len, GFP_KERNEL);
> +	if (!skb)
> +		return -ENOMEM;
> +
> +	memset(skb->data, 0x00, len);
> +	*skb_put(skb, 1) = H4_ALIVE_PKT;
> +	hdr = (struct h4p_alive_hdr *)skb_put(skb, sizeof(*hdr));
> +	hdr->dlen = sizeof(*pkt);
> +	pkt = (struct h4p_alive_pkt *)skb_put(skb, sizeof(*pkt));
> +	pkt->mid = H4P_ALIVE_REQ;
> +
> +	h4p_simple_send_frame(info, skb);
> +
> +	BT_DBG("Alive packet sent");
> +
> +	return 0;
> +}
> +
> +static void h4p_alive_packet(struct h4p_info *info,
> +				 struct sk_buff *skb)
> +{
> +	struct h4p_alive_hdr *hdr;
> +	struct h4p_alive_pkt *pkt;
> +
> +	BT_DBG("Received alive packet");
> +	hdr = (struct h4p_alive_hdr *)skb->data;
> +	if (hdr->dlen != sizeof(*pkt)) {
> +		dev_err(info->dev, "Corrupted alive message\n");
> +		info->init_error = -EIO;
> +		goto finish_alive;
> +	}
> +
> +	pkt = (struct h4p_alive_pkt *)skb_pull(skb, sizeof(*hdr));
> +	if (pkt->mid != H4P_ALIVE_RESP) {
> +		dev_err(info->dev, "Could not negotiate hci_h4p settings\n");
> +		info->init_error = -EINVAL;
> +	}
> +
> +finish_alive:
> +	complete(&info->init_completion);
> +	kfree_skb(skb);
> +}
> +
> +static int h4p_send_negotiation(struct h4p_info *info)
> +{
> +	struct h4p_neg_cmd *neg_cmd;
> +	struct h4p_neg_hdr *neg_hdr;
> +	struct sk_buff *skb;
> +	int err, len;
> +	u16 sysclk = 38400;
> +
> +	printk("Sending negotiation..");
> +	len = sizeof(*neg_cmd) + sizeof(*neg_hdr) + H4_TYPE_SIZE;
> +
> +	skb = bt_skb_alloc(len, GFP_KERNEL);
> +	if (!skb)
> +		return -ENOMEM;
> +
> +	memset(skb->data, 0x00, len);
> +	*skb_put(skb, 1) = H4_NEG_PKT;
> +	neg_hdr = (struct h4p_neg_hdr *)skb_put(skb, sizeof(*neg_hdr));
> +	neg_cmd = (struct h4p_neg_cmd *)skb_put(skb, sizeof(*neg_cmd));
> +
> +	neg_hdr->dlen = sizeof(*neg_cmd);
> +	neg_cmd->ack = H4P_NEG_REQ;
> +	neg_cmd->baud = cpu_to_le16(BT_BAUDRATE_DIVIDER/MAX_BAUD_RATE);
> +	neg_cmd->proto = H4P_PROTO_BYTE;
> +	neg_cmd->sys_clk = cpu_to_le16(sysclk);
> +
> +	h4p_change_speed(info, INIT_SPEED);
> +
> +	h4p_set_rts(info, 1);
> +	info->init_error = 0;
> +	init_completion(&info->init_completion);
> +
> +	h4p_simple_send_frame(info, skb);
> +
> +	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> +						       msecs_to_jiffies(1000))) {
> +		printk("h4p: negotiation did not return\n");
> +		return -ETIMEDOUT;
> +	}
> +
> +	if (info->init_error < 0)
> +		return info->init_error;
> +
> +	/* Change to operational settings */
> +	h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
> +	h4p_set_rts(info, 0);
> +	h4p_change_speed(info, MAX_BAUD_RATE);
> +
> +	err = h4p_wait_for_cts(info, 1, 100);
> +	if (err < 0)
> +		return err;
> +
> +	h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
> +	init_completion(&info->init_completion);
> +	err = h4p_send_alive_packet(info);
> +
> +	if (err < 0)
> +		return err;
> +
> +	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> +				msecs_to_jiffies(1000)))
> +		return -ETIMEDOUT;
> +
> +	if (info->init_error < 0)
> +		return info->init_error;
> +
> +	printk("Negotiation successful\n");
> +	return 0;
> +}
> +
> +static void h4p_negotiation_packet(struct h4p_info *info,
> +				       struct sk_buff *skb)
> +{
> +	struct h4p_neg_hdr *hdr;
> +	struct h4p_neg_evt *evt;
> +
> +	hdr = (struct h4p_neg_hdr *)skb->data;
> +	if (hdr->dlen != sizeof(*evt)) {
> +		info->init_error = -EIO;
> +		goto finish_neg;
> +	}
> +
> +	evt = (struct h4p_neg_evt *)skb_pull(skb, sizeof(*hdr));
> +
> +	if (evt->ack != H4P_NEG_ACK) {
> +		dev_err(info->dev, "Could not negotiate hci_h4p settings\n");
> +		info->init_error = -EINVAL;
> +	}
> +
> +	info->man_id = evt->man_id;
> +	info->ver_id = evt->ver_id;
> +	printk("Negotiation finished.\n");
> +
> +finish_neg:
> +
> +	complete(&info->init_completion);
> +	kfree_skb(skb);
> +}
> +
> +/* H4 packet handling functions */
> +static int h4p_get_hdr_len(struct h4p_info *info, u8 pkt_type)
> +{
> +	long retval;
> +
> +	switch (pkt_type) {
> +	case H4_EVT_PKT:
> +		retval = HCI_EVENT_HDR_SIZE;
> +		break;
> +	case H4_ACL_PKT:
> +		retval = HCI_ACL_HDR_SIZE;
> +		break;
> +	case H4_SCO_PKT:
> +		retval = HCI_SCO_HDR_SIZE;
> +		break;
> +	case H4_NEG_PKT:
> +		retval = H4P_NEG_HDR_SIZE;
> +		break;
> +	case H4_ALIVE_PKT:
> +		retval = H4P_ALIVE_HDR_SIZE;
> +		break;
> +	case H4_RADIO_PKT:
> +		retval = H4_RADIO_HDR_SIZE;
> +		break;
> +	default:
> +		dev_err(info->dev, "Unknown H4 packet type 0x%.2x\n", pkt_type);
> +		retval = -1;
> +		break;
> +	}
> +
> +	return retval;
> +}
> +
> +static unsigned int h4p_get_data_len(struct h4p_info *info,
> +					 struct sk_buff *skb)
> +{
> +	long retval = -1;
> +	struct hci_acl_hdr *acl_hdr;
> +	struct hci_sco_hdr *sco_hdr;
> +	struct hci_event_hdr *evt_hdr;
> +	struct h4p_neg_hdr *neg_hdr;
> +	struct h4p_alive_hdr *alive_hdr;
> +	struct h4p_radio_hdr *radio_hdr;
> +
> +	switch (bt_cb(skb)->pkt_type) {
> +	case H4_EVT_PKT:
> +		evt_hdr = (struct hci_event_hdr *)skb->data;
> +		retval = evt_hdr->plen;
> +		break;
> +	case H4_ACL_PKT:
> +		acl_hdr = (struct hci_acl_hdr *)skb->data;
> +		retval = le16_to_cpu(acl_hdr->dlen);
> +		break;
> +	case H4_SCO_PKT:
> +		sco_hdr = (struct hci_sco_hdr *)skb->data;
> +		retval = sco_hdr->dlen;
> +		break;
> +	case H4_RADIO_PKT:
> +		radio_hdr = (struct h4p_radio_hdr *)skb->data;
> +		retval = radio_hdr->dlen;
> +		break;
> +	case H4_NEG_PKT:
> +		neg_hdr = (struct h4p_neg_hdr *)skb->data;
> +		retval = neg_hdr->dlen;
> +		break;
> +	case H4_ALIVE_PKT:
> +		alive_hdr = (struct h4p_alive_hdr *)skb->data;
> +		retval = alive_hdr->dlen;
> +		break;
> +	}
> +
> +	return retval;
> +}
> +
> +static inline void h4p_recv_frame(struct h4p_info *info,
> +				      struct sk_buff *skb)
> +{
> +	if (info->initing)
> +	/*if (unlikely(!test_bit(HCI_RUNNING, &info->hdev->flags))) */ {
> +		switch (bt_cb(skb)->pkt_type) {
> +		case H4_NEG_PKT:
> +			h4p_negotiation_packet(info, skb);
> +			info->rx_state = WAIT_FOR_PKT_TYPE;
> +			return;
> +		case H4_ALIVE_PKT:
> +			h4p_alive_packet(info, skb);
> +			info->rx_state = WAIT_FOR_PKT_TYPE;
> +			return;
> +		}
> +	}
> +
> +	hci_recv_frame(info->hdev, skb);
> +	BT_DBG("Frame sent to upper layer");
> +}
> +
> +static inline void h4p_handle_byte(struct h4p_info *info, u8 byte)
> +{
> +	switch (info->rx_state) {
> +	case WAIT_FOR_PKT_TYPE:
> +		bt_cb(info->rx_skb)->pkt_type = byte;
> +		info->rx_count = h4p_get_hdr_len(info, byte);
> +		if (info->rx_count < 0) {
> +			info->hdev->stat.err_rx++;
> +			kfree_skb(info->rx_skb);
> +			info->rx_skb = NULL;
> +		} else {
> +			info->rx_state = WAIT_FOR_HEADER;
> +		}
> +		break;
> +	case WAIT_FOR_HEADER:
> +		info->rx_count--;
> +		*skb_put(info->rx_skb, 1) = byte;
> +		if (info->rx_count != 0)
> +			break;
> +		info->rx_count = h4p_get_data_len(info, info->rx_skb);
> +		if (info->rx_count > skb_tailroom(info->rx_skb)) {
> +			dev_err(info->dev, "frame too long\n");
> +			info->garbage_bytes = info->rx_count
> +				- skb_tailroom(info->rx_skb);
> +			kfree_skb(info->rx_skb);
> +			info->rx_skb = NULL;
> +			break;
> +		}
> +		info->rx_state = WAIT_FOR_DATA;
> +		break;
> +	case WAIT_FOR_DATA:
> +		info->rx_count--;
> +		*skb_put(info->rx_skb, 1) = byte;
> +		break;
> +	default:
> +		WARN_ON(1);
> +		break;
> +	}
> +
> +	if (info->rx_count == 0) {
> +		/* H4+ devices should always send word aligned packets */
> +		if (!(info->rx_skb->len % 2))
> +			info->garbage_bytes++;
> +		h4p_recv_frame(info, info->rx_skb);

The h4p_recv_frame should maybe done inline here since it only handles 2 exception packets. Also to make it easy, just leave the function if (info->rx_count).

This packet processing feels like a bit of spaghetti code. I think that is better handled in a proper function that goes through it and not with many tiny sub functions.

> +		info->rx_skb = NULL;
> +	}
> +}
> +
> +static void h4p_rx_tasklet(unsigned long data)
> +{
> +	u8 byte;
> +	struct h4p_info *info = (struct h4p_info *)data;
> +
> +	BT_DBG("tasklet woke up");
> +	BT_DBG("rx_tasklet woke up");
> +
> +	while (h4p_inb(info, UART_LSR) & UART_LSR_DR) {
> +		byte = h4p_inb(info, UART_RX);
> +		BT_DBG("[in: %02x]", byte);
> +		if (info->garbage_bytes) {
> +			info->garbage_bytes--;
> +			continue;
> +		}
> +		if (info->rx_skb == NULL) {
> +			info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
> +						    GFP_ATOMIC | GFP_DMA);
> +			if (!info->rx_skb) {
> +				dev_err(info->dev,
> +					"No memory for new packet\n");
> +				goto finish_rx;
> +			}
> +			info->rx_state = WAIT_FOR_PKT_TYPE;
> +			info->rx_skb->dev = (void *)info->hdev;
> +		}
> +		info->hdev->stat.byte_rx++;
> +		h4p_handle_byte(info, byte);
> +	}
> +
> +	if (!info->rx_enabled) {
> +		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT &&
> +						  info->autorts) {
> +			__h4p_set_auto_ctsrts(info, 0 , UART_EFR_RTS);
> +			info->autorts = 0;
> +		}
> +		/* Flush posted write to avoid spurious interrupts */
> +		h4p_inb(info, UART_OMAP_SCR);
> +		h4p_set_clk(info, &info->rx_clocks_en, 0);
> +	}
> +
> +finish_rx:
> +	BT_DBG("rx_ended");
> +}
> +
> +static void h4p_tx_tasklet(unsigned long data)
> +{
> +	unsigned int sent = 0;
> +	struct sk_buff *skb;
> +	struct h4p_info *info = (struct h4p_info *)data;
> +
> +	BT_DBG("tasklet woke up");
> +	BT_DBG("tx_tasklet woke up");
> +
> +	if (info->autorts != info->rx_enabled) {
> +		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
> +			if (info->autorts && !info->rx_enabled) {
> +				__h4p_set_auto_ctsrts(info, 0,
> +							  UART_EFR_RTS);
> +				info->autorts = 0;
> +			}
> +			if (!info->autorts && info->rx_enabled) {
> +				__h4p_set_auto_ctsrts(info, 1,
> +							  UART_EFR_RTS);
> +				info->autorts = 1;
> +			}
> +		} else {
> +			h4p_outb(info, UART_OMAP_SCR,
> +				     h4p_inb(info, UART_OMAP_SCR) |
> +				     UART_OMAP_SCR_EMPTY_THR);
> +			goto finish_tx;
> +		}
> +	}
> +
> +	skb = skb_dequeue(&info->txq);
> +	if (!skb) {
> +		/* No data in buffer */
> +		BT_DBG("skb ready");
> +		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
> +			h4p_outb(info, UART_IER,
> +				     h4p_inb(info, UART_IER) &
> +				     ~UART_IER_THRI);
> +			h4p_inb(info, UART_OMAP_SCR);
> +			h4p_disable_tx(info);
> +			return;
> +		}
> +		h4p_outb(info, UART_OMAP_SCR,
> +			     h4p_inb(info, UART_OMAP_SCR) |
> +			     UART_OMAP_SCR_EMPTY_THR);
> +		goto finish_tx;
> +	}
> +
> +	/* Copy data to tx fifo */
> +	while (!(h4p_inb(info, UART_OMAP_SSR) & UART_OMAP_SSR_TXFULL) &&
> +	       (sent < skb->len)) {
> +		//printk("[Out: %02x]", skb->data[sent]);
> +		//printk("%02x ", skb->data[sent]);
> +		h4p_outb(info, UART_TX, skb->data[sent]);
> +		sent++;
> +	}
> +
> +	info->hdev->stat.byte_tx += sent;
> +	if (skb->len == sent) {
> +		kfree_skb(skb);
> +	} else {
> +		skb_pull(skb, sent);
> +		skb_queue_head(&info->txq, skb);
> +	}
> +
> +	h4p_outb(info, UART_OMAP_SCR, h4p_inb(info, UART_OMAP_SCR) &
> +						     ~UART_OMAP_SCR_EMPTY_THR);
> +	h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
> +						 UART_IER_THRI);
> +
> +finish_tx:
> +	/* Flush posted write to avoid spurious interrupts */
> +	h4p_inb(info, UART_OMAP_SCR);
> +
> +}
> +
> +static irqreturn_t h4p_interrupt(int irq, void *data)
> +{
> +	struct h4p_info *info = (struct h4p_info *)data;
> +	u8 iir, msr;
> +	int ret;
> +
> +	ret = IRQ_NONE;
> +
> +	iir = h4p_inb(info, UART_IIR);
> +	if (iir & UART_IIR_NO_INT)
> +		return IRQ_HANDLED;
> +
> +	//BT_DBG("<%2x>", iir);
> +
> +	iir &= UART_IIR_ID;
> +
> +	if (iir == UART_IIR_MSI) {
> +		msr = h4p_inb(info, UART_MSR);
> +		ret = IRQ_HANDLED;
> +	}
> +	if (iir == UART_IIR_RLSI) {
> +		h4p_inb(info, UART_RX);
> +		h4p_inb(info, UART_LSR);
> +		ret = IRQ_HANDLED;
> +	}
> +
> +	if (iir == UART_IIR_RDI) {
> +		h4p_rx_tasklet((unsigned long)data);
> +		ret = IRQ_HANDLED;
> +	}
> +
> +	if (iir == UART_IIR_THRI) {
> +		h4p_tx_tasklet((unsigned long)data);
> +		ret = IRQ_HANDLED;
> +	}
> +
> +	return ret;
> +}
> +
> +static irqreturn_t h4p_wakeup_interrupt(int irq, void *dev_inst)
> +{
> +	struct h4p_info *info = dev_inst;
> +	int should_wakeup;
> +	struct hci_dev *hdev;
> +
> +	BT_DBG("[wakeup irq]");
> +	
> +	if (!info->hdev)
> +		return IRQ_HANDLED;
> +
> +	should_wakeup = gpio_get_value(info->host_wakeup_gpio);
> +	hdev = info->hdev;
> +
> +	if (!test_bit(HCI_RUNNING, &hdev->flags)) {
> +		if (should_wakeup == 1)
> +			complete_all(&info->test_completion);
> +
> +		printk("wakeup irq handled\n");
> +
> +		return IRQ_HANDLED;
> +	}
> +
> +	BT_DBG("gpio interrupt %d", should_wakeup);
> +
> +	/* Check if wee have missed some interrupts */
> +	if (info->rx_enabled == should_wakeup)
> +		return IRQ_HANDLED;
> +
> +	if (should_wakeup)
> +		h4p_enable_rx(info);
> +	else
> +		h4p_disable_rx(info);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static inline void h4p_set_pm_limits(struct h4p_info *info, bool set)
> +{
> +	struct h4p_platform_data *bt_plat_data = info->dev->platform_data;
> +
> +	if (unlikely(!bt_plat_data || !bt_plat_data->set_pm_limits))
> +		return;
> +
> +	if (set != !!test_bit(H4P_ACTIVE_MODE, &info->pm_flags)) {

I wonder what is the difference between x != !!y and x == !y or how many negations are really need.
 
> +		bt_plat_data->set_pm_limits(info->dev, set);
> +		if (set)
> +			set_bit(H4P_ACTIVE_MODE, &info->pm_flags);
> +		else
> +			clear_bit(H4P_ACTIVE_MODE, &info->pm_flags);
> +		BT_DBG("Change pm constraints to: %s", set ? "set" : "clear");
> +		return;
> +	}
> +
> +	BT_DBG("pm constraints remains: %s", set ? "set" : "clear");
> +}
> +
> +static int h4p_reset(struct h4p_info *info)
> +{
> +	int err;
> +
> +	err = h4p_reset_uart(info);
> +	if (err < 0) {
> +		dev_err(info->dev, "Uart reset failed\n");
> +		return err;
> +	}
> +	h4p_init_uart(info);
> +	h4p_set_rts(info, 0);
> +
> +	gpio_set_value(info->reset_gpio, 0);
> +	gpio_set_value(info->bt_wakeup_gpio, 1);
> +	msleep(10);
> +
> +	if (gpio_get_value(info->host_wakeup_gpio) == 1) {
> +		dev_err(info->dev, "host_wakeup_gpio not low\n");
> +		return -EPROTO;
> +	}
> +
> +	init_completion(&info->test_completion);
> +	gpio_set_value(info->reset_gpio, 1);
> +
> +	if (!wait_for_completion_interruptible_timeout(&info->test_completion,
> +						       msecs_to_jiffies(100))) {
> +		dev_err(info->dev, "wakeup test timed out\n");
> +		complete_all(&info->test_completion);
> +		return -EPROTO;
> +	}
> +
> +	err = h4p_wait_for_cts(info, 1, 100);
> +	if (err < 0) {
> +		dev_err(info->dev, "No cts from bt chip\n");
> +		return err;
> +	}
> +
> +	h4p_set_rts(info, 1);
> +
> +	return 0;
> +}
> +
> +/* hci callback functions */
> +static int h4p_hci_flush(struct hci_dev *hdev)
> +{
> +	struct h4p_info *info = hci_get_drvdata(hdev);
> +
> +	skb_queue_purge(&info->txq);
> +
> +	return 0;
> +}
> +
> +static int h4p_bt_wakeup_test(struct h4p_info *info)
> +{
> +	/*
> +	 * Test Sequence:
> +	 * Host de-asserts the BT_WAKE_UP line.
> +	 * Host polls the UART_CTS line, waiting for it to be de-asserted.
> +	 * Host asserts the BT_WAKE_UP line.
> +	 * Host polls the UART_CTS line, waiting for it to be asserted.
> +	 * Host de-asserts the BT_WAKE_UP line (allow the Bluetooth device to
> +	 * sleep).
> +	 * Host polls the UART_CTS line, waiting for it to be de-asserted.
> +	 */
> +	int err;
> +	int ret = -ECOMM;
> +
> +	if (!info)
> +		return -EINVAL;
> +
> +	/* Disable wakeup interrupts */
> +	disable_irq(gpio_to_irq(info->host_wakeup_gpio));
> +
> +	gpio_set_value(info->bt_wakeup_gpio, 0);
> +	err = h4p_wait_for_cts(info, 0, 100);
> +	if (err) {
> +		dev_warn(info->dev,
> +				"bt_wakeup_test: fail: CTS low timed out: %d\n",
> +				err);
> +		goto out;
> +	}
> +
> +	gpio_set_value(info->bt_wakeup_gpio, 1);
> +	err = h4p_wait_for_cts(info, 1, 100);
> +	if (err) {
> +		dev_warn(info->dev,
> +				"bt_wakeup_test: fail: CTS high timed out: %d\n",
> +				err);
> +		goto out;
> +	}
> +
> +	gpio_set_value(info->bt_wakeup_gpio, 0);
> +	err = h4p_wait_for_cts(info, 0, 100);
> +	if (err) {
> +		dev_warn(info->dev,
> +				"bt_wakeup_test: fail: CTS re-low timed out: %d\n",
> +				err);
> +		goto out;
> +	}
> +
> +	ret = 0;
> +
> +out:
> +
> +	/* Re-enable wakeup interrupts */
> +	enable_irq(gpio_to_irq(info->host_wakeup_gpio));
> +
> +	return ret;
> +}
> +
> +static int h4p_setup(struct hci_dev *hdev)
> +{
> +	struct h4p_info *info = hci_get_drvdata(hdev);
> +	int err;
> +	unsigned long flags;
> +
> +	/*
> +	 * Disable smart-idle as UART TX interrupts
> +	 * are not wake-up capable
> +	 */
> +	h4p_smart_idle(info, 0);
> +	
> +	err = h4p_read_fw(info);
> +	if (err < 0) {
> +		dev_err(info->dev, "Cannot read firmware\n");
> +		goto err_clean;
> +	}
> +
> +	h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
> +	h4p_set_rts(info, 0);
> +	h4p_change_speed(info, BC4_MAX_BAUD_RATE);
> +	h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
> +
> +	info->pm_enabled = 1;
> +
> +	err = h4p_bt_wakeup_test(info);
> +	if (err < 0) {
> +		dev_err(info->dev, "BT wakeup test failed.\n");
> +		goto err_clean;
> +	}
> +
> +	spin_lock_irqsave(&info->lock, flags);
> +	info->rx_enabled = gpio_get_value(info->host_wakeup_gpio);
> +	h4p_set_clk(info, &info->rx_clocks_en, info->rx_enabled);
> +	spin_unlock_irqrestore(&info->lock, flags);
> +
> +	h4p_set_clk(info, &info->tx_clocks_en, 0);
> +
> +	kfree_skb(info->alive_cmd_skb);
> +	info->alive_cmd_skb = NULL;
> +	info->initing = 0;
> +	return 0;
> +
> +err_clean:
> +	printk("hci_setup: something failed, should do the clean up\n");
> +	return err;
> +}
> +
> +static int h4p_hci_setup(struct hci_dev *hdev)
> +{
> +	return 0;
> +}

If you do not use it, then there is no point in including it. The core will do the right thing if you leave it out.

> +
> +static void hci_uninit(struct hci_dev *hdev)
> +{
> +	struct h4p_info *info = hci_get_drvdata(hdev);
> +
> +	h4p_reset_uart(info);
> +	del_timer_sync(&info->lazy_release);
> +	h4p_set_clk(info, &info->tx_clocks_en, 0);
> +	h4p_set_clk(info, &info->rx_clocks_en, 0);
> +	gpio_set_value(info->reset_gpio, 0);
> +	gpio_set_value(info->bt_wakeup_gpio, 0);
> +	kfree_skb(info->rx_skb);
> +	info->rx_skb = NULL;
> +}
> +
> +static int h4p_hci_open(struct hci_dev *hdev)
> +{
> +	struct h4p_info *info;
> +	int err;
> +
> +	info = hci_get_drvdata(hdev);

Fold this into the variable declaration.

> +
> +	if (test_bit(HCI_RUNNING, &hdev->flags))
> +		return 0;
> +
> +	/* TI1271 has HW bug and boot up might fail. Original code retried 
> +	   up to three times, but we removed TI1271 support. */

Comment coding style needs to be correct.

> +
> +	info->rx_enabled = 1;
> +	info->rx_state = WAIT_FOR_PKT_TYPE;
> +	info->rx_count = 0;
> +	info->garbage_bytes = 0;
> +	info->rx_skb = NULL;
> +	info->pm_enabled = 0;
> +	init_completion(&info->fw_completion);
> +	h4p_set_clk(info, &info->tx_clocks_en, 1);
> +	h4p_set_clk(info, &info->rx_clocks_en, 1);
> +
> +	err = h4p_reset(info);
> +	if (err < 0)
> +		goto err_clean;
> +
> +	h4p_set_auto_ctsrts(info, 1, UART_EFR_CTS | UART_EFR_RTS);
> +	info->autorts = 1;
> +
> +	info->initing = 1;
> +	printk("hci_setup\n");
> +
> +	err = h4p_send_negotiation(info);
> +	set_bit(HCI_RUNNING, &hdev->flags);
> +#if 0
> +	err = h4p_setup(hdev);
> +	if (err < 0) {
> +		printk("h4p setup failed\n");
> +		goto err_clean;
> +	}
> +#endif
> +
> +	atomic_set(&hdev->cmd_cnt, 1);
> +	set_bit(HCI_INIT, &hdev->flags);
> +	
> +	return h4p_setup(hdev);
> +
> +err_clean:
> +	printk("hci_open: something failed\n");
> +	h4p_hci_flush(hdev);
> +	hci_uninit(hdev);
> +	kfree_skb(info->alive_cmd_skb);
> +	info->alive_cmd_skb = NULL;
> +
> +	return err;
> +}
> +
> +static int h4p_hci_close(struct hci_dev *hdev)
> +{
> +	struct h4p_info *info = hci_get_drvdata(hdev);
> +
> +	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
> +		return 0;
> +
> +	h4p_hci_flush(hdev);
> +	h4p_set_clk(info, &info->tx_clocks_en, 1);
> +	h4p_set_clk(info, &info->rx_clocks_en, 1);
> +	hci_uninit(hdev);
> +	return 0;
> +}
> +
> +static int h4p_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> +	struct h4p_info *info;
> +	int err = 0;
> +
> +	BT_DBG("hci_send_frame: dev %p, skb %p\n", hdev, skb);
> +
> +	info = hci_get_drvdata(hdev);

Same as above and for all other cases as well.

> +
> +	if (!test_bit(HCI_RUNNING, &hdev->flags)) {
> +		dev_warn(info->dev, "Frame for non-running device\n");
> +		return -EIO;
> +	}
> +
> +	switch (bt_cb(skb)->pkt_type) {
> +	case HCI_COMMAND_PKT:
> +		hdev->stat.cmd_tx++;
> +		break;
> +	case HCI_ACLDATA_PKT:
> +		hdev->stat.acl_tx++;
> +		break;
> +	case HCI_SCODATA_PKT:
> +		hdev->stat.sco_tx++;
> +		break;
> +	}
> +
> +	/* Push frame type to skb */
> +	*skb_push(skb, 1) = (bt_cb(skb)->pkt_type);
> +	/* We should always send word aligned data to h4+ devices */
> +	if (skb->len % 2) {
> +		err = skb_pad(skb, 1);
> +		if (!err)
> +			*skb_put(skb, 1) = 0x00;
> +	}
> +	if (err)
> +		return err;
> +
> +	skb_queue_tail(&info->txq, skb);
> +	if (!info->initing)
> +		h4p_enable_tx(info);
> +	else
> +		h4p_enable_tx_nopm(info);
> +
> +	return 0;
> +}
> +
> +static ssize_t h4p_hci_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
> +{
> +	struct h4p_info *info = hci_get_drvdata(hdev);
> +
> +	printk("Set bdaddr... %pMR\n", bdaddr);
> +	return 0;
> +}
> +
> +static int h4p_register_hdev(struct h4p_info *info)
> +{
> +	struct hci_dev *hdev;
> +
> +	/* Initialize and register HCI device */
> +
> +	hdev = hci_alloc_dev();
> +	if (!hdev) {
> +		dev_err(info->dev, "Can't allocate memory for device\n");
> +		return -ENOMEM;
> +	}
> +	info->hdev = hdev;
> +
> +	hdev->bus = HCI_UART;
> +	hci_set_drvdata(hdev, info);
> +
> +	hdev->open = h4p_hci_open;
> +	hdev->setup = h4p_hci_setup;
> +	hdev->close = h4p_hci_close;
> +	hdev->flush = h4p_hci_flush;
> +	hdev->send = h4p_hci_send_frame;
> +	hdev->set_bdaddr = h4p_hci_set_bdaddr;
> +
> +	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);

Not sure why this one is needed. So that needs to be figured out.

And you want to set the QUIRK_INVALID_BADDR. At least you want to do that in the final submission.

> +
> +	SET_HCIDEV_DEV(hdev, info->dev);
> +
> +	if (hci_register_dev(hdev) >= 0)
> +		return 0;
> +
> +	dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
> +	hci_free_dev(info->hdev);
> +	return -ENODEV;
> +}

And normally this is folded into the probe handling and not in a separate function.

> +
> +static int h4p_probe_pdata(struct platform_device *pdev, struct h4p_info *info,
> +			       struct h4p_platform_data *bt_plat_data)
> +{
> +	info->chip_type = bt_plat_data->chip_type;
> +	info->bt_wakeup_gpio = bt_plat_data->bt_wakeup_gpio;
> +	info->host_wakeup_gpio = bt_plat_data->host_wakeup_gpio;
> +	info->reset_gpio = bt_plat_data->reset_gpio;
> +	info->reset_gpio_shared = bt_plat_data->reset_gpio_shared;
> +	info->bt_sysclk = bt_plat_data->bt_sysclk;
> +
> +	info->irq = bt_plat_data->uart_irq;
> +	info->uart_base = devm_ioremap(&pdev->dev, bt_plat_data->uart_base,
> +					SZ_2K);
> +	info->uart_iclk = devm_clk_get(&pdev->dev, bt_plat_data->uart_iclk);
> +	info->uart_fclk = devm_clk_get(&pdev->dev, bt_plat_data->uart_fclk);
> +	return 0;
> +}
> +
> +static int h4p_probe_dt(struct platform_device *pdev, struct h4p_info *info)
> +{
> +	struct device_node *node;
> +	struct device_node *uart = pdev->dev.of_node;
> +	u32 val;
> +	struct resource *mem;	
> +
> +	node = of_get_child_by_name(uart, "device");
> +
> +	if (!node)
> +		return -ENODATA;
> +
> +	info->chip_type = 3;	/* Bcm2048 */
> +	
> +	if (of_property_read_u32(node, "bt-sysclk", &val)) return -EINVAL;
> +	info->bt_sysclk = val;
> +
> +	info->reset_gpio       = of_get_named_gpio(node, "reset-gpios", 0);
> +	info->host_wakeup_gpio = of_get_named_gpio(node, "host-wakeup-gpios", 0);
> +	info->bt_wakeup_gpio   = of_get_named_gpio(node, "bluetooth-wakeup-gpios", 0);	
> +
> +	if (!uart) {
> +		dev_err(&pdev->dev, "UART link not provided\n");
> +		return -EINVAL;
> +	}
> +
> +	info->irq = irq_of_parse_and_map(uart, 0);
> +
> +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	info->uart_base = devm_ioremap_resource(&pdev->dev, mem);
> +
> +	info->uart_iclk = of_clk_get_by_name(uart, "ick");
> +	info->uart_fclk = of_clk_get_by_name(uart, "fck");	
> +
> +	printk("DT: have neccessary data\n");
> +	return 0;
> +}
> +			  
> +
> +static int h4p_probe(struct platform_device *pdev)
> +{
> +
> +	struct h4p_info *info;
> +	int err;
> +
> +	dev_info(&pdev->dev, "Registering HCI H4P device\n");
> +	info = devm_kzalloc(&pdev->dev, sizeof(struct h4p_info),
> +			GFP_KERNEL);
> +	if (!info)
> +		return -ENOMEM;
> +
> +	info->dev = &pdev->dev;
> +	info->tx_enabled = 1;
> +	info->rx_enabled = 1;
> +	spin_lock_init(&info->lock);
> +	spin_lock_init(&info->clocks_lock);
> +	skb_queue_head_init(&info->txq);
> +
> +	if (pdev->dev.platform_data) {
> +		err = h4p_probe_pdata(pdev, info, pdev->dev.platform_data);
> +	} else {
> +		err = h4p_probe_dt(pdev, info);
> +	}
> +	if (err) {
> +		dev_err(&pdev->dev, "Could not get Bluetooth config data\n");
> +		return -ENODATA;
> +	}
> +
> +	printk("base/irq gpio: %lx/%d/%d\n",
> +	       info->uart_base, info->irq);
> +	printk("RESET/BTWU/HOSTWU gpio: %d/%d/%d\n",
> +	       info->reset_gpio, info->bt_wakeup_gpio, info->host_wakeup_gpio);
> +	printk("chip type, sysclk: %d/%d\n", info->chip_type, info->bt_sysclk);
> +	printk("clock i/f: %lx/%lx\n", info->uart_iclk, info->uart_fclk);	
> +
> +	init_completion(&info->test_completion);
> +	complete_all(&info->test_completion);
> +
> +	err = devm_gpio_request_one(&pdev->dev, info->reset_gpio,
> +				    GPIOF_OUT_INIT_LOW, "bt_reset");
> +	if (err < 0) {
> +		dev_err(&pdev->dev, "Cannot get GPIO line %d\n",
> +			info->reset_gpio);
> +		return err;
> +	}
> +
> +	err = devm_gpio_request_one(&pdev->dev, info->bt_wakeup_gpio,
> +				    GPIOF_OUT_INIT_LOW, "bt_wakeup");
> +	if (err < 0) {
> +		dev_err(info->dev, "Cannot get GPIO line 0x%d",
> +			info->bt_wakeup_gpio);
> +		return err;
> +	}
> +
> +	err = devm_gpio_request_one(&pdev->dev, info->host_wakeup_gpio,
> +				    GPIOF_DIR_IN, "host_wakeup");
> +	if (err < 0) {
> +		dev_err(info->dev, "Cannot get GPIO line %d",
> +		       info->host_wakeup_gpio);
> +		return err;
> +	}
> +
> +	err = devm_request_irq(&pdev->dev, info->irq, h4p_interrupt,
> +				IRQF_DISABLED, "hci_h4p", info);
> +	if (err < 0) {
> +		dev_err(info->dev, "hci_h4p: unable to get IRQ %d\n",
> +			info->irq);
> +		return err;
> +	}
> +
> +	err = devm_request_irq(&pdev->dev, gpio_to_irq(info->host_wakeup_gpio),
> +			  h4p_wakeup_interrupt,  IRQF_TRIGGER_FALLING |
> +			  IRQF_TRIGGER_RISING | IRQF_DISABLED,
> +			  "h4p_wkup", info);
> +	if (err < 0) {
> +		dev_err(info->dev, "hci_h4p: unable to get wakeup IRQ %d\n",
> +			  gpio_to_irq(info->host_wakeup_gpio));
> +		return err;
> +	}
> +
> +	err = irq_set_irq_wake(gpio_to_irq(info->host_wakeup_gpio), 1);
> +	if (err < 0) {
> +		dev_err(info->dev, "hci_h4p: unable to set wakeup for IRQ %d\n",
> +				gpio_to_irq(info->host_wakeup_gpio));
> +		return err;
> +	}
> +
> +	init_timer_deferrable(&info->lazy_release);
> +	info->lazy_release.function = h4p_lazy_clock_release;
> +	info->lazy_release.data = (unsigned long)info;
> +	h4p_set_clk(info, &info->tx_clocks_en, 1);
> +	printk("resetting uart....\n");
> +	err = h4p_reset_uart(info);
> +	printk("reset ok....\n");

I would really prefer that you either use BT_* print functions here or dev_* ones.

> +	if (err < 0)
> +		return err;
> +	gpio_set_value(info->reset_gpio, 0);
> +	h4p_set_clk(info, &info->tx_clocks_en, 0);
> +
> +	platform_set_drvdata(pdev, info);
> +
> +	if (h4p_register_hdev(info) < 0) {
> +		dev_err(info->dev, "failed to register hci_h4p hci device\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int h4p_remove(struct platform_device *pdev)
> +{
> +	struct h4p_info *info;
> +
> +	info = platform_get_drvdata(pdev);
> +
> +	h4p_hci_close(info->hdev);
> +	hci_unregister_dev(info->hdev);
> +	hci_free_dev(info->hdev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id h4p_of_match[] = {
> +	{ .compatible = "brcm,uart,bcm2048" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, h4p_of_match);
> +
> +static struct platform_driver h4p_driver = {
> +	.probe		= h4p_probe,
> +	.remove		= h4p_remove,
> +	.driver		= {
> +		.name	= "disabled" "hci_h4p",
> +		.owner  = THIS_MODULE,
> +		.of_match_table = of_match_ptr(h4p_of_match),
> +	},
> +};
> +
> +module_platform_driver(h4p_driver);
> +
> +MODULE_ALIAS("platform:hci_h4p");
> +MODULE_DESCRIPTION("Bluetooth h4 driver with nokia extensions");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ville Tervo");
> diff --git a/drivers/bluetooth/nokia_fw-bcm.c b/drivers/bluetooth/nokia_fw-bcm.c
> new file mode 100644
> index 0000000..fd88727
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_fw-bcm.c
> @@ -0,0 +1,27 @@
> +/*
> + * This file is part of Nokia H4P bluetooth driver
> + *
> + * Copyright (C) 2005-2008 Nokia Corporation.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#include <linux/skbuff.h>
> +#include <linux/delay.h>
> +#include <linux/serial_reg.h>
> +
> +#include "hci_h4p.h"
> +
> diff --git a/drivers/bluetooth/nokia_fw.c b/drivers/bluetooth/nokia_fw.c
> new file mode 100644
> index 0000000..7b6a750
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_fw.c
> @@ -0,0 +1,105 @@
> +/*
> + * This file is part of hci_h4p bluetooth driver
> + *
> + * Copyright (C) 2005-2008 Nokia Corporation.
> + * Copyright (C) 2014 Pavel Machek <[e-mail]>
> + *
> + * Contact: Ville Tervo <[e-mail]>

Since he no longer works for Nokia, this email will bounce. Might just take it out as well.

> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/skbuff.h>
> +#include <linux/firmware.h>
> +#include <linux/clk.h>
> +
> +#include <net/bluetooth/bluetooth.h>
> +
> +#include "hci_h4p.h"
> +
> +#define FW_NAME_BCM2048		"bcmfw.bin"

I have the feeling, we really want to put that into "nokia/bcmfw.bin" since all these firmwares were special releases made for Nokia.

> +
> +#define BT_DBG printk

I do not get these re-declartions.

> +
> +
> +/* Read fw. Return length of the command. If no more commands in
> + * fw 0 is returned. In error case return value is negative.
> + */
> +int h4p_read_fw(struct h4p_info *info)
> +{
> +	int num = 0;
> +	int fw_pos = 0;
> +	struct sk_buff *skb;
> +	const struct firmware *fw_entry = NULL;
> +	int err = -ENOENT;
> +	unsigned int cmd_len = 0;	
> +
> +	err = request_firmware(&fw_entry, FW_NAME_BCM2048, info->dev);
> +	if (err != 0 || !fw_entry)
> +		return err;

I think that checking for err < 0 is plenty here.

> +
> +	while(1) {

while (1) or while (true)

> +		int cmd, len;
> +
> +		fw_pos += cmd_len;		
> +		
> +		if (fw_pos >= fw_entry->size)
> +			break;
> +
> +		if (fw_pos + 2 > fw_entry->size) {
> +			dev_err(info->dev, "Corrupted firmware image 1\n");
> +			err = -EMSGSIZE;
> +			break;
> +		}
> +
> +		cmd_len = fw_entry->data[fw_pos++];
> +		cmd_len += fw_entry->data[fw_pos++] << 8;
> +		if (cmd_len == 0)
> +			break;
> +
> +		if (fw_pos + cmd_len > fw_entry->size) {
> +			dev_err(info->dev, "Corrupted firmware image 2\n");
> +			err = -EMSGSIZE;
> +			break;
> +		}
> +
> +		/* Skip first two packets */
> +		if (++num <= 2)
> +			continue;
> +
> +		/* Note that this is timing-critical. If sending packets takes too
> +		   long, initialization will fail. */
> +		printk("Packet %d...", num);
> +
> +		cmd = fw_entry->data[fw_pos+1];
> +		cmd += fw_entry->data[fw_pos+2] << 8;
> +		len = fw_entry->data[fw_pos+3];
> +		printk("cmd %x, len %d.", cmd, len);
> +
> +		skb = __hci_cmd_sync(info->hdev, cmd, len, fw_entry->data+fw_pos+4, 500);
> +		if (IS_ERR(skb)) {
> +			dev_err(info->dev, "...sending cmd failed %d\n", PTR_ERR(skb));
> +			err = -EIO;
> +			break;
> +		}
> +	}
> +
> +	release_firmware(fw_entry);
> +	return err;
> +}
> +
> +MODULE_FIRMWARE(FW_NAME_BCM2048);
> diff --git a/drivers/bluetooth/nokia_uart.c b/drivers/bluetooth/nokia_uart.c
> new file mode 100644
> index 0000000..2cae639
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_uart.c
> @@ -0,0 +1,179 @@
> +/*
> + * This file is part of Nokia H4P bluetooth driver
> + *
> + * Copyright (C) 2005, 2006 Nokia Corporation.
> + * Copyright (C) 2014 Pavel Machek <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/clk.h>
> +
> +#include <linux/io.h>
> +
> +#include "hci_h4p.h"
> +
> +
> +

Why is this a separate file? And if so, why not all UART specific details are in this file. Including bunch of the defines you have in the header.

> +int h4p_wait_for_cts(struct h4p_info *info, int active,
> +			 int timeout_ms)
> +{
> +	unsigned long timeout;
> +	int state;
> +
> +	timeout = jiffies + msecs_to_jiffies(timeout_ms);
> +	for (;;) {
> +		state = h4p_inb(info, UART_MSR) & UART_MSR_CTS;
> +		if (active) {
> +			if (state)
> +				return 0;
> +		} else {
> +			if (!state)
> +				return 0;
> +		}
> +		if (time_after(jiffies, timeout))
> +			return -ETIMEDOUT;
> +		msleep(1);
> +	}
> +}
> +
> +void __h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which)
> +{
> +	u8 lcr, b;
> +
> +	lcr = h4p_inb(info, UART_LCR);
> +	h4p_outb(info, UART_LCR, 0xbf);
> +	b = h4p_inb(info, UART_EFR);
> +	if (on)
> +		b |= which;
> +	else
> +		b &= ~which;
> +	h4p_outb(info, UART_EFR, b);
> +	h4p_outb(info, UART_LCR, lcr);
> +}
> +
> +void h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&info->lock, flags);
> +	__h4p_set_auto_ctsrts(info, on, which);
> +	spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +void h4p_change_speed(struct h4p_info *info, unsigned long speed)
> +{
> +	unsigned int divisor;
> +	u8 lcr, mdr1;
> +
> +	BT_DBG("Setting speed %lu", speed);
> +
> +	if (speed >= 460800) {
> +		divisor = UART_CLOCK / 13 / speed;
> +		mdr1 = 3;
> +	} else {
> +		divisor = UART_CLOCK / 16 / speed;
> +		mdr1 = 0;
> +	}
> +
> +	/* Make sure UART mode is disabled */
> +	h4p_outb(info, UART_OMAP_MDR1, 7);
> +
> +	lcr = h4p_inb(info, UART_LCR);
> +	h4p_outb(info, UART_LCR, UART_LCR_DLAB);     /* Set DLAB */
> +	h4p_outb(info, UART_DLL, divisor & 0xff);    /* Set speed */
> +	h4p_outb(info, UART_DLM, divisor >> 8);
> +	h4p_outb(info, UART_LCR, lcr);
> +
> +	/* Make sure UART mode is enabled */
> +	h4p_outb(info, UART_OMAP_MDR1, mdr1);
> +}
> +
> +int h4p_reset_uart(struct h4p_info *info)
> +{
> +	int count = 0;
> +
> +	/* Reset the UART */
> +	h4p_outb(info, UART_OMAP_SYSC, UART_SYSC_OMAP_RESET);
> +	while (!(h4p_inb(info, UART_OMAP_SYSS) & UART_SYSS_RESETDONE)) {
> +		if (count++ > 100) {
> +			dev_err(info->dev, "hci_h4p: UART reset timeout\n");
> +			return -ENODEV;
> +		}
> +		udelay(1);
> +	}
> +
> +	return 0;
> +}
> +
> +void h4p_store_regs(struct h4p_info *info)
> +{
> +	u16 lcr = 0;
> +
> +	lcr = h4p_inb(info, UART_LCR);
> +	h4p_outb(info, UART_LCR, 0xBF);
> +	info->dll = h4p_inb(info, UART_DLL);
> +	info->dlh = h4p_inb(info, UART_DLM);
> +	info->efr = h4p_inb(info, UART_EFR);
> +	h4p_outb(info, UART_LCR, lcr);
> +	info->mdr1 = h4p_inb(info, UART_OMAP_MDR1);
> +	info->ier = h4p_inb(info, UART_IER);
> +}
> +
> +void h4p_restore_regs(struct h4p_info *info)
> +{
> +	u16 lcr = 0;
> +
> +	h4p_init_uart(info);
> +
> +	h4p_outb(info, UART_OMAP_MDR1, 7);
> +	lcr = h4p_inb(info, UART_LCR);
> +	h4p_outb(info, UART_LCR, 0xBF);
> +	h4p_outb(info, UART_DLL, info->dll);    /* Set speed */
> +	h4p_outb(info, UART_DLM, info->dlh);
> +	h4p_outb(info, UART_EFR, info->efr);
> +	h4p_outb(info, UART_LCR, lcr);
> +	h4p_outb(info, UART_OMAP_MDR1, info->mdr1);
> +	h4p_outb(info, UART_IER, info->ier);
> +}
> +
> +void h4p_init_uart(struct h4p_info *info)
> +{
> +	u8 mcr, efr;
> +
> +	/* Enable and setup FIFO */
> +	h4p_outb(info, UART_OMAP_MDR1, 0x00);
> +
> +	h4p_outb(info, UART_LCR, 0xbf);
> +	efr = h4p_inb(info, UART_EFR);
> +	h4p_outb(info, UART_EFR, UART_EFR_ECB);
> +	h4p_outb(info, UART_LCR, UART_LCR_DLAB);
> +	mcr = h4p_inb(info, UART_MCR);
> +	h4p_outb(info, UART_MCR, UART_MCR_TCRTLR);
> +	h4p_outb(info, UART_FCR, UART_FCR_ENABLE_FIFO |
> +			UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
> +			(3 << 6) | (0 << 4));
> +	h4p_outb(info, UART_LCR, 0xbf);
> +	h4p_outb(info, UART_TI752_TLR, 0xed);
> +	h4p_outb(info, UART_TI752_TCR, 0xef);
> +	h4p_outb(info, UART_EFR, efr);
> +	h4p_outb(info, UART_LCR, UART_LCR_DLAB);
> +	h4p_outb(info, UART_MCR, 0x00);
> +	h4p_outb(info, UART_LCR, UART_LCR_WLEN8);
> +	h4p_outb(info, UART_IER, UART_IER_RDI);
> +	h4p_outb(info, UART_OMAP_SYSC, (1 << 0) | (1 << 2) | (2 << 3));
> +}
> diff --git a/include/linux/platform_data/bt-nokia-h4p.h b/include/linux/platform_data/bt-nokia-h4p.h
> index 30d169d..c1a7e64 100644
> --- a/include/linux/platform_data/bt-nokia-h4p.h
> +++ b/include/linux/platform_data/bt-nokia-h4p.h
> @@ -21,9 +21,9 @@
> 
> 
> /**
> - * struct hci_h4p_platform data - hci_h4p Platform data structure
> + * struct h4p_platform data - hci_h4p Platform data structure
>  */
> -struct hci_h4p_platform_data {
> +struct h4p_platform_data {
> 	int chip_type;
> 	int bt_sysclk;
> 	unsigned int bt_wakeup_gpio;

And this just needs to ultimately go away. We need to get this as DT detail.

Regards

Marcel

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Pavel Machek Dec. 18, 2014, 7:31 p.m. UTC | #10

Hi!

> > +	h4p_simple_send_frame(info, skb);
> > +
> > +	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> > +						       msecs_to_jiffies(1000))) {
> > +		printk("h4p: negotiation did not return\n");
> 
> Memory leak in the error case

And memory leak in the normal case, too, no? Fixed.

> > +	case H4_ACL_PKT:
> > +		acl_hdr = (struct hci_acl_hdr *)skb->data;
> > +		retval = le16_to_cpu(acl_hdr->dlen);
> 
> Could you explain, why only this needs endianness converted?

This one is 16 bit, the others I checked are 8 bit.

> > +static void h4p_rx_tasklet(unsigned long data)
> > +{
> > +	u8 byte;
> > +	struct h4p_info *info = (struct h4p_info *)data;
> > +
> > +	BT_DBG("tasklet woke up");
> > +	BT_DBG("rx_tasklet woke up");
> 
> Isn't this a bit redundant?

Fixed.

> > +	struct sk_buff *skb;
> > +	struct h4p_info *info = (struct h4p_info *)data;
> > +
> > +	BT_DBG("tasklet woke up");
> > +	BT_DBG("tx_tasklet woke up");
> 
> Doubled?

Fixed.

Thanks,
									Pavel

Pavel Machek Dec. 18, 2014, 8:10 p.m. UTC | #11

Hi!
On Thu 2014-12-18 20:31:53, Pavel Machek wrote:
> Hi!
> 
> > > +	h4p_simple_send_frame(info, skb);
> > > +
> > > +	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> > > +						       msecs_to_jiffies(1000))) {
> > > +		printk("h4p: negotiation did not return\n");
> > 
> > Memory leak in the error case
> 
> And memory leak in the normal case, too, no? Fixed.

Actually, no, h4p_simple_send_frame passes skb to network stack, and
it should free it as neccessary.

								Pavel

Pavel Machek Dec. 19, 2014, 9:50 a.m. UTC | #12

Hi!

> And you want to set the QUIRK_INVALID_BADDR. At least you want to do that in the final submission.
> 

Ok, I found out that I can do it and result works, provided that I do
hciconfig hci0 up/down first.

I have trouble understanding... h4p_hci_open() seems to be called as
soon as I insmod the driver. Who does that? Is it some kind of udev
magic?

...
> > +#include "hci_h4p.h"
> > +
> > +#define BT_DBG(a...) do {} while(0)
> 
> Why is this needed? BT_DBG is hooked up with dynamic debug.
...

I did all the changes as requested. Thanks. I did't see harm in
include guards, but I removed them; it is not important.

> > +	if (info->rx_count == 0) {
> > +		/* H4+ devices should always send word aligned packets */
> > +		if (!(info->rx_skb->len % 2))
> > +			info->garbage_bytes++;
> > +		h4p_recv_frame(info, info->rx_skb);
> 
> The h4p_recv_frame should maybe done inline here since it only handles 2 exception packets. Also to make it easy, just leave the function if (info->rx_count).
> 
> This packet processing feels like a bit of spaghetti code. I think that is better handled in a proper function that goes through it and not with many tiny sub functions.
>

Well, CodingStyle says something about functions that should be kept
short... And when manually inlined, the inner function would have to
be made less readable, as it uses return to shortcut processing. 


To use __hci_cmd_sync()

> > +
> > +	SET_HCIDEV_DEV(hdev, info->dev);
> > +
> > +	if (hci_register_dev(hdev) >= 0)
> > +		return 0;
> > +
> > +	dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
> > +	hci_free_dev(info->hdev);
> > +	return -ENODEV;
> > +}
> 
> And normally this is folded into the probe handling and not in a
> separate function.

The probe function is too long, already...

> > +#include <linux/delay.h>
> > +#include <linux/clk.h>
> > +
> > +#include <linux/io.h>
> > +
> > +#include "hci_h4p.h"
> 
> Why is this a separate file? And if so, why not all UART specific details are in this file. Including bunch of the defines you have in the header.
> 

Well, you wanted less global functions, so I moved some as inlines to
headers. I guess I can merge nokia_core and nokia_uart if really wanted.

I did rest of requested changes.

Thanks,
									Pavel

Marcel Holtmann Dec. 19, 2014, 9:58 a.m. UTC | #13

Hi Pavel,

>> And you want to set the QUIRK_INVALID_BADDR. At least you want to do that in the final submission.
>> 
> 
> Ok, I found out that I can do it and result works, provided that I do
> hciconfig hci0 up/down first.

that should not be the case. Actually hciconfig uses old ioctl. A full Bluetooth system running bluetoothd (from BlueZ 5) will never use any old ioctl. Only an old system (BlueZ 4) will use ioctl.

> I have trouble understanding... h4p_hci_open() seems to be called as
> soon as I insmod the driver. Who does that? Is it some kind of udev
> magic?

As soon as you do hci_register_dev, it will bring up the device and run the basic initialization. That is needed to get the address, version information and features. Otherwise the mgmt interface can not work. We need basic information about the device.

So what the kernel will do internally when you find a device is bring it up, get the basics and then bring it back down (in case nobody uses it). See hci_power_on work.

> ...
>>> +#include "hci_h4p.h"
>>> +
>>> +#define BT_DBG(a...) do {} while(0)
>> 
>> Why is this needed? BT_DBG is hooked up with dynamic debug.
> ...
> 
> I did all the changes as requested. Thanks. I did't see harm in
> include guards, but I removed them; it is not important.

There is no harm in including the guards. We just don't do it for internal files. And thus if anyone tries to be sneaky and build circular inclusion they will fall flat on their faces. That is the only reason.

> 
>>> +	if (info->rx_count == 0) {
>>> +		/* H4+ devices should always send word aligned packets */
>>> +		if (!(info->rx_skb->len % 2))
>>> +			info->garbage_bytes++;
>>> +		h4p_recv_frame(info, info->rx_skb);
>> 
>> The h4p_recv_frame should maybe done inline here since it only handles 2 exception packets. Also to make it easy, just leave the function if (info->rx_count).
>> 
>> This packet processing feels like a bit of spaghetti code. I think that is better handled in a proper function that goes through it and not with many tiny sub functions.
>> 
> 
> Well, CodingStyle says something about functions that should be kept
> short... And when manually inlined, the inner function would have to
> be made less readable, as it uses return to shortcut processing. 

It also should not make me have to follow 3 functions to figure out what it is actually doing.

> 
> 
> To use __hci_cmd_sync()
> 
>>> +
>>> +	SET_HCIDEV_DEV(hdev, info->dev);
>>> +
>>> +	if (hci_register_dev(hdev) >= 0)
>>> +		return 0;
>>> +
>>> +	dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
>>> +	hci_free_dev(info->hdev);
>>> +	return -ENODEV;
>>> +}
>> 
>> And normally this is folded into the probe handling and not in a
>> separate function.
> 
> The probe function is too long, already...

Have you compared it to other functions. Normally probe() functions in general are all pretty long since they have to do tons of stuff. Having all in one function means you can read through it at once.

> 
>>> +#include <linux/delay.h>
>>> +#include <linux/clk.h>
>>> +
>>> +#include <linux/io.h>
>>> +
>>> +#include "hci_h4p.h"
>> 
>> Why is this a separate file? And if so, why not all UART specific details are in this file. Including bunch of the defines you have in the header.
>> 
> 
> Well, you wanted less global functions, so I moved some as inlines to
> headers. I guess I can merge nokia_core and nokia_uart if really wanted.

Would this become easier when some of the OMAP specific stuff is moved out of this driver? If that is possible.

Regards

Marcel

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Pavel Machek Dec. 20, 2014, 3:48 p.m. UTC | #14

Hi!

> > I have trouble understanding... h4p_hci_open() seems to be called as
> > soon as I insmod the driver. Who does that? Is it some kind of udev
> > magic?
> 
> As soon as you do hci_register_dev, it will bring up the device and run the basic initialization. That is needed to get the address, version information and features. Otherwise the mgmt interface can not work. We need basic information about the device.
> 
> So what the kernel will do internally when you find a device is bring it up, get the basics and then bring it back down (in case nobody uses it). See hci_power_on work.
>

Aha, slightly unexpected, but it matches observations. Good.

> > To use __hci_cmd_sync()
> > 
> >>> +
> >>> +	SET_HCIDEV_DEV(hdev, info->dev);
> >>> +
> >>> +	if (hci_register_dev(hdev) >= 0)
> >>> +		return 0;
> >>> +
> >>> +	dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
> >>> +	hci_free_dev(info->hdev);
> >>> +	return -ENODEV;
> >>> +}
> >> 
> >> And normally this is folded into the probe handling and not in a
> >> separate function.
> > 
> > The probe function is too long, already...
> 
> Have you compared it to other functions. Normally probe() functions in general are all pretty long since they have to do tons of stuff. Having all in one function means you can read through it at once.
>

Ok.

> >>> +#include "hci_h4p.h"
> >> 
> >> Why is this a separate file? And if so, why not all UART specific details are in this file. Including bunch of the defines you have in the header.
> >> 
> > 
> > Well, you wanted less global functions, so I moved some as inlines to
> > headers. I guess I can merge nokia_core and nokia_uart if really wanted.
> 
> Would this become easier when some of the OMAP specific stuff is moved out of this driver? If that is possible.
> 

Yes, I can investigate further cleanups. But original plan was to
merge it and then clean up the rest. Could we do that, please?

Thanks,
									Pavel

Marcel Holtmann Dec. 20, 2014, 11:39 p.m. UTC | #15

Hi Pavel,

>>> I have trouble understanding... h4p_hci_open() seems to be called as
>>> soon as I insmod the driver. Who does that? Is it some kind of udev
>>> magic?
>> 
>> As soon as you do hci_register_dev, it will bring up the device and run the basic initialization. That is needed to get the address, version information and features. Otherwise the mgmt interface can not work. We need basic information about the device.
>> 
>> So what the kernel will do internally when you find a device is bring it up, get the basics and then bring it back down (in case nobody uses it). See hci_power_on work.
>> 
> 
> Aha, slightly unexpected, but it matches observations. Good.

we are at Bluetooth 4.2 specification now. Thinks got a lot more complicated these days.

> 
>>> To use __hci_cmd_sync()
>>> 
>>>>> +
>>>>> +	SET_HCIDEV_DEV(hdev, info->dev);
>>>>> +
>>>>> +	if (hci_register_dev(hdev) >= 0)
>>>>> +		return 0;
>>>>> +
>>>>> +	dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
>>>>> +	hci_free_dev(info->hdev);
>>>>> +	return -ENODEV;
>>>>> +}
>>>> 
>>>> And normally this is folded into the probe handling and not in a
>>>> separate function.
>>> 
>>> The probe function is too long, already...
>> 
>> Have you compared it to other functions. Normally probe() functions in general are all pretty long since they have to do tons of stuff. Having all in one function means you can read through it at once.
>> 
> 
> Ok.
> 
>>>>> +#include "hci_h4p.h"
>>>> 
>>>> Why is this a separate file? And if so, why not all UART specific details are in this file. Including bunch of the defines you have in the header.
>>>> 
>>> 
>>> Well, you wanted less global functions, so I moved some as inlines to
>>> headers. I guess I can merge nokia_core and nokia_uart if really wanted.
>> 
>> Would this become easier when some of the OMAP specific stuff is moved out of this driver? If that is possible.
>> 
> 
> Yes, I can investigate further cleanups. But original plan was to
> merge it and then clean up the rest. Could we do that, please?

You need to fix all these small details. There are tons of whitespace damages, indentation issues, trailing whitespaces and what not. Even if they were in the original driver to begin this, they can not be in a driver submitted these days.

Regards

Marcel

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Patch

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 4547dc2..0fc7d3a 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -243,4 +243,14 @@  config BT_WILINK
 	  Say Y here to compile support for Texas Instrument's WiLink7 driver
 	  into the kernel or say M to compile it as module (btwilink).
 
+config BT_NOKIA_H4P
+	tristate "HCI driver with H4 Nokia extensions"
+	depends on ARCH_OMAP
+	help
+	  Bluetooth HCI driver with H4 extensions.  This driver provides
+	  support for H4+ Bluetooth chip with vendor-specific H4 extensions.
+
+	  Say Y here to compile support for h4 extended devices into the kernel
+	  or say M to compile it as module (btnokia_h4p).
+
 endmenu
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 9fe8a87..ec7074fe 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -31,4 +31,7 @@  hci_uart-$(CONFIG_BT_HCIUART_ATH3K)	+= hci_ath.o
 hci_uart-$(CONFIG_BT_HCIUART_3WIRE)	+= hci_h5.o
 hci_uart-objs				:= $(hci_uart-y)
 
+obj-$(CONFIG_BT_NOKIA_H4P)      += hci_h4p.o
+hci_h4p-objs := nokia_core.o nokia_fw.o nokia_uart.o
+
 ccflags-y += -D__CHECK_ENDIAN__
new file mode 100644
index 0000000..6445a99
--- /dev/null
+++ b/drivers/bluetooth/hci_h4p.h
@@ -0,0 +1,234 @@ 
+/*
+ * This file is part of Nokia H4P bluetooth driver
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __DRIVERS_BLUETOOTH_H4P_H
+#define __DRIVERS_BLUETOOTH_H4P_H
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/hci.h>
+
+#include <linux/serial_reg.h>
+
+#define UART_SYSC_OMAP_RESET	0x03
+#define UART_SYSS_RESETDONE	0x01
+#define UART_OMAP_SCR_EMPTY_THR	0x08
+#define UART_OMAP_SCR_WAKEUP	0x10
+#define UART_OMAP_SSR_WAKEUP	0x02
+#define UART_OMAP_SSR_TXFULL	0x01
+
+#define UART_OMAP_SYSC_IDLEMODE		0x03
+#define UART_OMAP_SYSC_IDLEMASK		(3 << UART_OMAP_SYSC_IDLEMODE)
+
+#define UART_OMAP_SYSC_FORCE_IDLE	(0 << UART_OMAP_SYSC_IDLEMODE)
+#define UART_OMAP_SYSC_NO_IDLE		(1 << UART_OMAP_SYSC_IDLEMODE)
+#define UART_OMAP_SYSC_SMART_IDLE	(2 << UART_OMAP_SYSC_IDLEMODE)
+
+#define H4P_TRANSFER_MODE		1
+#define H4P_SCHED_TRANSFER_MODE		2
+#define H4P_ACTIVE_MODE			3
+
+struct h4p_info {
+	struct timer_list lazy_release;
+	struct hci_dev *hdev;
+	spinlock_t lock;
+
+	void __iomem *uart_base;
+	unsigned long uart_phys_base;
+	int irq;
+	struct device *dev;
+	u8 chip_type;
+	u8 bt_wakeup_gpio;
+	u8 host_wakeup_gpio;
+	u8 reset_gpio;
+	u8 reset_gpio_shared;
+	u8 bt_sysclk;
+	u8 man_id;
+	u8 ver_id;
+
+	struct sk_buff_head fw_queue;
+	struct sk_buff *alive_cmd_skb;
+	struct completion init_completion;
+	struct completion fw_completion;
+	struct completion test_completion;
+	int fw_error;
+	int init_error;
+
+	struct sk_buff_head txq;
+
+	struct sk_buff *rx_skb;
+	long rx_count;
+	unsigned long rx_state;
+	unsigned long garbage_bytes;
+
+	bdaddr_t bd_addr;
+	struct sk_buff_head *fw_q;
+
+	int pm_enabled;
+	int tx_enabled;
+	int autorts;
+	int rx_enabled;
+	unsigned long pm_flags;
+
+	int tx_clocks_en;
+	int rx_clocks_en;
+	spinlock_t clocks_lock;
+	struct clk *uart_iclk;
+	struct clk *uart_fclk;
+	atomic_t clk_users;
+	u16 dll;
+	u16 dlh;
+	u16 ier;
+	u16 mdr1;
+	u16 efr;
+
+	int initing;
+};
+
+struct h4p_radio_hdr {
+	u8 evt;
+	u8 dlen;
+} __packed;
+
+struct h4p_neg_hdr {
+	u8 dlen;
+} __packed;
+#define H4P_NEG_HDR_SIZE 1
+
+#define H4P_NEG_REQ	0x00
+#define H4P_NEG_ACK	0x20
+#define H4P_NEG_NAK	0x40
+
+#define H4P_PROTO_PKT	0x44
+#define H4P_PROTO_BYTE	0x4c
+
+#define H4P_ID_CSR	0x02
+#define H4P_ID_BCM2048	0x04
+#define H4P_ID_TI1271	0x31
+
+struct h4p_neg_cmd {
+	u8	ack;
+	u16	baud;
+	u16	unused1;
+	u8	proto;
+	u16	sys_clk;
+	u16	unused2;
+} __packed;
+
+struct h4p_neg_evt {
+	u8	ack;
+	u16	baud;
+	u16	unused1;
+	u8	proto;
+	u16	sys_clk;
+	u16	unused2;
+	u8	man_id;
+	u8	ver_id;
+} __packed;
+
+#define H4P_ALIVE_REQ	0x55
+#define H4P_ALIVE_RESP	0xcc
+
+struct h4p_alive_hdr {
+	u8	dlen;
+} __packed;
+#define H4P_ALIVE_HDR_SIZE 1
+
+struct h4p_alive_pkt {
+	u8	mid;
+	u8	unused;
+} __packed;
+
+#define MAX_BAUD_RATE		921600
+#define BC4_MAX_BAUD_RATE	3692300
+#define UART_CLOCK		48000000
+#define BT_INIT_DIVIDER		320
+#define BT_BAUDRATE_DIVIDER	384000000
+#define BT_SYSCLK_DIV		1000
+#define INIT_SPEED		120000
+
+#define H4_TYPE_SIZE		1
+#define H4_RADIO_HDR_SIZE	2
+
+/* H4+ packet types */
+#define H4_CMD_PKT		0x01
+#define H4_ACL_PKT		0x02
+#define H4_SCO_PKT		0x03
+#define H4_EVT_PKT		0x04
+#define H4_NEG_PKT		0x06
+#define H4_ALIVE_PKT		0x07
+#define H4_RADIO_PKT		0x08
+
+/* TX states */
+#define WAIT_FOR_PKT_TYPE	1
+#define WAIT_FOR_HEADER		2
+#define WAIT_FOR_DATA		3
+
+struct hci_fw_event {
+	struct hci_event_hdr hev;
+	struct hci_ev_cmd_complete cmd;
+	u8 status;
+} __packed;
+
+void h4p_simple_send_frame(struct h4p_info *info, struct sk_buff *skb);
+
+int h4p_send_alive_packet(struct h4p_info *info);
+
+int h4p_read_fw(struct h4p_info *info);
+int h4p_send_fw(struct h4p_info *info);
+void h4p_parse_fw_event(struct h4p_info *info, struct sk_buff *skb);
+
+static inline void h4p_outb(struct h4p_info *info, unsigned int offset, u8 val)
+{
+	__raw_writeb(val, info->uart_base + (offset << 2));
+}
+
+static inline u8 h4p_inb(struct h4p_info *info, unsigned int offset)
+{
+	u8 val;
+	val = __raw_readb(info->uart_base + (offset << 2));
+	return val;
+}
+
+static inline void h4p_set_rts(struct h4p_info *info, int active)
+{
+	u8 b;
+
+	b = h4p_inb(info, UART_MCR);
+	if (active)
+		b |= UART_MCR_RTS;
+	else
+		b &= ~UART_MCR_RTS;
+	h4p_outb(info, UART_MCR, b);
+}
+
+int h4p_wait_for_cts(struct h4p_info *info, int active, int timeout_ms);
+void __h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which);
+void h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which);
+void h4p_change_speed(struct h4p_info *info, unsigned long speed);
+int h4p_reset_uart(struct h4p_info *info);
+void h4p_init_uart(struct h4p_info *info);
+void h4p_enable_tx(struct h4p_info *info);
+void h4p_store_regs(struct h4p_info *info);
+void h4p_restore_regs(struct h4p_info *info);
+void h4p_smart_idle(struct h4p_info *info, bool enable);
+
+#endif /* __DRIVERS_BLUETOOTH_H4P_H */
diff --git a/drivers/bluetooth/nokia_core.c b/drivers/bluetooth/nokia_core.c
new file mode 100644
index 0000000..ca9746d
--- /dev/null
+++ b/drivers/bluetooth/nokia_core.c
@@ -0,0 +1,1262 @@ 
+/*
+ * This file is part of Nokia H4P bluetooth driver
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation.
+ * Copyright (C) 2014 Pavel Machek <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * Thanks to all the Nokia people that helped with this driver,
+ * including Ville Tervo and Roger Quadros.
+ *
+ * Power saving functionality was removed from this driver to make
+ * merging easier.
+ */
+
+/*
+insmod hci_h4p.ko && hciconfig hci0 up && hcitool inq && hciconfig hci0 down && hciconfig hci0 up && hcitool inq && rmmod hci_h4p
+
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/serial_reg.h>
+#include <linux/skbuff.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/timer.h>
+#include <linux/kthread.h>
+#include <linux/io.h>
+#include <linux/completion.h>
+#include <linux/sizes.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/hci.h>
+
+#include <linux/platform_data/bt-nokia-h4p.h>
+
+#include "hci_h4p.h"
+
+#define BT_DBG(a...) do {} while(0)
+
+/* This should be used in function that cannot release clocks */
+static void h4p_set_clk(struct h4p_info *info, int *clock, int enable)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->clocks_lock, flags);
+	if (enable && !*clock) {
+		BT_DBG("Enabling %p", clock);
+		clk_prepare_enable(info->uart_fclk);
+		clk_prepare_enable(info->uart_iclk);
+		if (atomic_read(&info->clk_users) == 0)
+			h4p_restore_regs(info);
+		atomic_inc(&info->clk_users);
+	}
+
+	if (!enable && *clock) {
+		BT_DBG("Disabling %p", clock);
+		if (atomic_dec_and_test(&info->clk_users))
+			h4p_store_regs(info);
+		clk_disable_unprepare(info->uart_fclk);
+		clk_disable_unprepare(info->uart_iclk);
+	}
+
+	*clock = enable;
+	spin_unlock_irqrestore(&info->clocks_lock, flags);
+}
+
+static void h4p_lazy_clock_release(unsigned long data)
+{
+	struct h4p_info *info = (struct h4p_info *)data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->lock, flags);
+	if (!info->tx_enabled)
+		h4p_set_clk(info, &info->tx_clocks_en, 0);
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+/* Power management functions */
+void h4p_smart_idle(struct h4p_info *info, bool enable)
+{
+	u8 v;
+
+	v = h4p_inb(info, UART_OMAP_SYSC);
+	v &= ~(UART_OMAP_SYSC_IDLEMASK);
+
+	if (enable)
+		v |= UART_OMAP_SYSC_SMART_IDLE;
+	else
+		v |= UART_OMAP_SYSC_NO_IDLE;
+
+	h4p_outb(info, UART_OMAP_SYSC, v);
+}
+
+static inline void h4p_schedule_pm(struct h4p_info *info)
+{
+}
+
+static void h4p_disable_tx(struct h4p_info *info)
+{
+	if (!info->pm_enabled)
+		return;
+
+	/* Re-enable smart-idle */
+	h4p_smart_idle(info, 1);
+
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	mod_timer(&info->lazy_release, jiffies + msecs_to_jiffies(100));
+	info->tx_enabled = 0;
+}
+
+void h4p_enable_tx_nopm(struct h4p_info *info)
+{
+	unsigned long flags;
+	
+	spin_lock_irqsave(&info->lock, flags);
+	h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
+		     UART_IER_THRI);
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+void h4p_enable_tx(struct h4p_info *info)
+{
+	unsigned long flags;
+
+	if (!info->pm_enabled)
+		return;
+
+	h4p_schedule_pm(info);
+
+	spin_lock_irqsave(&info->lock, flags);
+	del_timer(&info->lazy_release);
+	h4p_set_clk(info, &info->tx_clocks_en, 1);
+	info->tx_enabled = 1;
+	gpio_set_value(info->bt_wakeup_gpio, 1);
+	h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
+		     UART_IER_THRI);
+	/*
+	 * Disable smart-idle as UART TX interrupts
+	 * are not wake-up capable
+	 */
+	h4p_smart_idle(info, 0);
+
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void h4p_disable_rx(struct h4p_info *info)
+{
+	if (!info->pm_enabled)
+		return;
+
+	info->rx_enabled = 0;
+
+	if (h4p_inb(info, UART_LSR) & UART_LSR_DR)
+		return;
+
+	if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
+		return;
+
+	__h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
+	info->autorts = 0;
+	h4p_set_clk(info, &info->rx_clocks_en, 0);
+}
+
+static void h4p_enable_rx(struct h4p_info *info)
+{
+	if (!info->pm_enabled)
+		return;
+
+	h4p_schedule_pm(info);
+
+	h4p_set_clk(info, &info->rx_clocks_en, 1);
+	info->rx_enabled = 1;
+
+	if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
+		return;
+
+	__h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
+	info->autorts = 1;
+}
+
+void h4p_simple_send_frame(struct h4p_info *info, struct sk_buff *skb)
+{
+	skb_queue_tail(&info->txq, skb);
+	h4p_enable_tx_nopm(info);
+}
+
+/* Negotiation functions */
+int h4p_send_alive_packet(struct h4p_info *info)
+{
+	struct h4p_alive_hdr *hdr;
+	struct h4p_alive_pkt *pkt;
+	struct sk_buff *skb;
+	int len;
+
+	BT_DBG("Sending alive packet");
+
+	len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt);
+	skb = bt_skb_alloc(len, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	memset(skb->data, 0x00, len);
+	*skb_put(skb, 1) = H4_ALIVE_PKT;
+	hdr = (struct h4p_alive_hdr *)skb_put(skb, sizeof(*hdr));
+	hdr->dlen = sizeof(*pkt);
+	pkt = (struct h4p_alive_pkt *)skb_put(skb, sizeof(*pkt));
+	pkt->mid = H4P_ALIVE_REQ;
+
+	h4p_simple_send_frame(info, skb);
+
+	BT_DBG("Alive packet sent");
+
+	return 0;
+}
+
+static void h4p_alive_packet(struct h4p_info *info,
+				 struct sk_buff *skb)
+{
+	struct h4p_alive_hdr *hdr;
+	struct h4p_alive_pkt *pkt;
+
+	BT_DBG("Received alive packet");
+	hdr = (struct h4p_alive_hdr *)skb->data;
+	if (hdr->dlen != sizeof(*pkt)) {
+		dev_err(info->dev, "Corrupted alive message\n");
+		info->init_error = -EIO;
+		goto finish_alive;
+	}
+
+	pkt = (struct h4p_alive_pkt *)skb_pull(skb, sizeof(*hdr));
+	if (pkt->mid != H4P_ALIVE_RESP) {
+		dev_err(info->dev, "Could not negotiate hci_h4p settings\n");
+		info->init_error = -EINVAL;
+	}
+
+finish_alive:
+	complete(&info->init_completion);
+	kfree_skb(skb);
+}
+
+static int h4p_send_negotiation(struct h4p_info *info)
+{
+	struct h4p_neg_cmd *neg_cmd;
+	struct h4p_neg_hdr *neg_hdr;
+	struct sk_buff *skb;
+	int err, len;
+	u16 sysclk = 38400;
+
+	printk("Sending negotiation..");
+	len = sizeof(*neg_cmd) + sizeof(*neg_hdr) + H4_TYPE_SIZE;
+
+	skb = bt_skb_alloc(len, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	memset(skb->data, 0x00, len);
+	*skb_put(skb, 1) = H4_NEG_PKT;
+	neg_hdr = (struct h4p_neg_hdr *)skb_put(skb, sizeof(*neg_hdr));
+	neg_cmd = (struct h4p_neg_cmd *)skb_put(skb, sizeof(*neg_cmd));
+
+	neg_hdr->dlen = sizeof(*neg_cmd);
+	neg_cmd->ack = H4P_NEG_REQ;
+	neg_cmd->baud = cpu_to_le16(BT_BAUDRATE_DIVIDER/MAX_BAUD_RATE);
+	neg_cmd->proto = H4P_PROTO_BYTE;
+	neg_cmd->sys_clk = cpu_to_le16(sysclk);
+
+	h4p_change_speed(info, INIT_SPEED);
+
+	h4p_set_rts(info, 1);
+	info->init_error = 0;
+	init_completion(&info->init_completion);
+
+	h4p_simple_send_frame(info, skb);
+
+	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
+						       msecs_to_jiffies(1000))) {
+		printk("h4p: negotiation did not return\n");
+		return -ETIMEDOUT;
+	}
+
+	if (info->init_error < 0)
+		return info->init_error;
+
+	/* Change to operational settings */
+	h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
+	h4p_set_rts(info, 0);
+	h4p_change_speed(info, MAX_BAUD_RATE);
+
+	err = h4p_wait_for_cts(info, 1, 100);
+	if (err < 0)
+		return err;
+
+	h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
+	init_completion(&info->init_completion);
+	err = h4p_send_alive_packet(info);
+
+	if (err < 0)
+		return err;
+
+	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
+				msecs_to_jiffies(1000)))
+		return -ETIMEDOUT;
+
+	if (info->init_error < 0)
+		return info->init_error;
+
+	printk("Negotiation successful\n");
+	return 0;
+}
+
+static void h4p_negotiation_packet(struct h4p_info *info,
+				       struct sk_buff *skb)
+{
+	struct h4p_neg_hdr *hdr;
+	struct h4p_neg_evt *evt;
+
+	hdr = (struct h4p_neg_hdr *)skb->data;
+	if (hdr->dlen != sizeof(*evt)) {
+		info->init_error = -EIO;
+		goto finish_neg;
+	}
+
+	evt = (struct h4p_neg_evt *)skb_pull(skb, sizeof(*hdr));
+
+	if (evt->ack != H4P_NEG_ACK) {
+		dev_err(info->dev, "Could not negotiate hci_h4p settings\n");
+		info->init_error = -EINVAL;
+	}
+
+	info->man_id = evt->man_id;
+	info->ver_id = evt->ver_id;
+	printk("Negotiation finished.\n");
+
+finish_neg:
+
+	complete(&info->init_completion);
+	kfree_skb(skb);
+}
+
+/* H4 packet handling functions */
+static int h4p_get_hdr_len(struct h4p_info *info, u8 pkt_type)
+{
+	long retval;
+
+	switch (pkt_type) {
+	case H4_EVT_PKT:
+		retval = HCI_EVENT_HDR_SIZE;
+		break;
+	case H4_ACL_PKT:
+		retval = HCI_ACL_HDR_SIZE;
+		break;
+	case H4_SCO_PKT:
+		retval = HCI_SCO_HDR_SIZE;
+		break;
+	case H4_NEG_PKT:
+		retval = H4P_NEG_HDR_SIZE;
+		break;
+	case H4_ALIVE_PKT:
+		retval = H4P_ALIVE_HDR_SIZE;
+		break;
+	case H4_RADIO_PKT:
+		retval = H4_RADIO_HDR_SIZE;
+		break;
+	default:
+		dev_err(info->dev, "Unknown H4 packet type 0x%.2x\n", pkt_type);
+		retval = -1;
+		break;
+	}
+
+	return retval;
+}
+
+static unsigned int h4p_get_data_len(struct h4p_info *info,
+					 struct sk_buff *skb)
+{
+	long retval = -1;
+	struct hci_acl_hdr *acl_hdr;
+	struct hci_sco_hdr *sco_hdr;
+	struct hci_event_hdr *evt_hdr;
+	struct h4p_neg_hdr *neg_hdr;
+	struct h4p_alive_hdr *alive_hdr;
+	struct h4p_radio_hdr *radio_hdr;
+
+	switch (bt_cb(skb)->pkt_type) {
+	case H4_EVT_PKT:
+		evt_hdr = (struct hci_event_hdr *)skb->data;
+		retval = evt_hdr->plen;
+		break;
+	case H4_ACL_PKT:
+		acl_hdr = (struct hci_acl_hdr *)skb->data;
+		retval = le16_to_cpu(acl_hdr->dlen);
+		break;
+	case H4_SCO_PKT:
+		sco_hdr = (struct hci_sco_hdr *)skb->data;
+		retval = sco_hdr->dlen;
+		break;
+	case H4_RADIO_PKT:
+		radio_hdr = (struct h4p_radio_hdr *)skb->data;
+		retval = radio_hdr->dlen;
+		break;
+	case H4_NEG_PKT:
+		neg_hdr = (struct h4p_neg_hdr *)skb->data;
+		retval = neg_hdr->dlen;
+		break;
+	case H4_ALIVE_PKT:
+		alive_hdr = (struct h4p_alive_hdr *)skb->data;
+		retval = alive_hdr->dlen;
+		break;
+	}
+
+	return retval;
+}
+
+static inline void h4p_recv_frame(struct h4p_info *info,
+				      struct sk_buff *skb)
+{
+	if (info->initing)
+	/*if (unlikely(!test_bit(HCI_RUNNING, &info->hdev->flags))) */ {
+		switch (bt_cb(skb)->pkt_type) {
+		case H4_NEG_PKT:
+			h4p_negotiation_packet(info, skb);
+			info->rx_state = WAIT_FOR_PKT_TYPE;
+			return;
+		case H4_ALIVE_PKT:
+			h4p_alive_packet(info, skb);
+			info->rx_state = WAIT_FOR_PKT_TYPE;
+			return;
+		}
+	}
+
+	hci_recv_frame(info->hdev, skb);
+	BT_DBG("Frame sent to upper layer");
+}
+
+static inline void h4p_handle_byte(struct h4p_info *info, u8 byte)
+{
+	switch (info->rx_state) {
+	case WAIT_FOR_PKT_TYPE:
+		bt_cb(info->rx_skb)->pkt_type = byte;
+		info->rx_count = h4p_get_hdr_len(info, byte);
+		if (info->rx_count < 0) {
+			info->hdev->stat.err_rx++;
+			kfree_skb(info->rx_skb);
+			info->rx_skb = NULL;
+		} else {
+			info->rx_state = WAIT_FOR_HEADER;
+		}
+		break;
+	case WAIT_FOR_HEADER:
+		info->rx_count--;
+		*skb_put(info->rx_skb, 1) = byte;
+		if (info->rx_count != 0)
+			break;
+		info->rx_count = h4p_get_data_len(info, info->rx_skb);
+		if (info->rx_count > skb_tailroom(info->rx_skb)) {
+			dev_err(info->dev, "frame too long\n");
+			info->garbage_bytes = info->rx_count
+				- skb_tailroom(info->rx_skb);
+			kfree_skb(info->rx_skb);
+			info->rx_skb = NULL;
+			break;
+		}
+		info->rx_state = WAIT_FOR_DATA;
+		break;
+	case WAIT_FOR_DATA:
+		info->rx_count--;
+		*skb_put(info->rx_skb, 1) = byte;
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+
+	if (info->rx_count == 0) {
+		/* H4+ devices should always send word aligned packets */
+		if (!(info->rx_skb->len % 2))
+			info->garbage_bytes++;
+		h4p_recv_frame(info, info->rx_skb);
+		info->rx_skb = NULL;
+	}
+}
+
+static void h4p_rx_tasklet(unsigned long data)
+{
+	u8 byte;
+	struct h4p_info *info = (struct h4p_info *)data;
+
+	BT_DBG("tasklet woke up");
+	BT_DBG("rx_tasklet woke up");
+
+	while (h4p_inb(info, UART_LSR) & UART_LSR_DR) {
+		byte = h4p_inb(info, UART_RX);
+		BT_DBG("[in: %02x]", byte);
+		if (info->garbage_bytes) {
+			info->garbage_bytes--;
+			continue;
+		}
+		if (info->rx_skb == NULL) {
+			info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
+						    GFP_ATOMIC | GFP_DMA);
+			if (!info->rx_skb) {
+				dev_err(info->dev,
+					"No memory for new packet\n");
+				goto finish_rx;
+			}
+			info->rx_state = WAIT_FOR_PKT_TYPE;
+			info->rx_skb->dev = (void *)info->hdev;
+		}
+		info->hdev->stat.byte_rx++;
+		h4p_handle_byte(info, byte);
+	}
+
+	if (!info->rx_enabled) {
+		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT &&
+						  info->autorts) {
+			__h4p_set_auto_ctsrts(info, 0 , UART_EFR_RTS);
+			info->autorts = 0;
+		}
+		/* Flush posted write to avoid spurious interrupts */
+		h4p_inb(info, UART_OMAP_SCR);
+		h4p_set_clk(info, &info->rx_clocks_en, 0);
+	}
+
+finish_rx:
+	BT_DBG("rx_ended");
+}
+
+static void h4p_tx_tasklet(unsigned long data)
+{
+	unsigned int sent = 0;
+	struct sk_buff *skb;
+	struct h4p_info *info = (struct h4p_info *)data;
+
+	BT_DBG("tasklet woke up");
+	BT_DBG("tx_tasklet woke up");
+
+	if (info->autorts != info->rx_enabled) {
+		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
+			if (info->autorts && !info->rx_enabled) {
+				__h4p_set_auto_ctsrts(info, 0,
+							  UART_EFR_RTS);
+				info->autorts = 0;
+			}
+			if (!info->autorts && info->rx_enabled) {
+				__h4p_set_auto_ctsrts(info, 1,
+							  UART_EFR_RTS);
+				info->autorts = 1;
+			}
+		} else {
+			h4p_outb(info, UART_OMAP_SCR,
+				     h4p_inb(info, UART_OMAP_SCR) |
+				     UART_OMAP_SCR_EMPTY_THR);
+			goto finish_tx;
+		}
+	}
+
+	skb = skb_dequeue(&info->txq);
+	if (!skb) {
+		/* No data in buffer */
+		BT_DBG("skb ready");
+		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
+			h4p_outb(info, UART_IER,
+				     h4p_inb(info, UART_IER) &
+				     ~UART_IER_THRI);
+			h4p_inb(info, UART_OMAP_SCR);
+			h4p_disable_tx(info);
+			return;
+		}
+		h4p_outb(info, UART_OMAP_SCR,
+			     h4p_inb(info, UART_OMAP_SCR) |
+			     UART_OMAP_SCR_EMPTY_THR);
+		goto finish_tx;
+	}
+
+	/* Copy data to tx fifo */
+	while (!(h4p_inb(info, UART_OMAP_SSR) & UART_OMAP_SSR_TXFULL) &&
+	       (sent < skb->len)) {
+		//printk("[Out: %02x]", skb->data[sent]);
+		//printk("%02x ", skb->data[sent]);
+		h4p_outb(info, UART_TX, skb->data[sent]);
+		sent++;
+	}
+
+	info->hdev->stat.byte_tx += sent;
+	if (skb->len == sent) {
+		kfree_skb(skb);
+	} else {
+		skb_pull(skb, sent);
+		skb_queue_head(&info->txq, skb);
+	}
+
+	h4p_outb(info, UART_OMAP_SCR, h4p_inb(info, UART_OMAP_SCR) &
+						     ~UART_OMAP_SCR_EMPTY_THR);
+	h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
+						 UART_IER_THRI);
+
+finish_tx:
+	/* Flush posted write to avoid spurious interrupts */
+	h4p_inb(info, UART_OMAP_SCR);
+
+}
+
+static irqreturn_t h4p_interrupt(int irq, void *data)
+{
+	struct h4p_info *info = (struct h4p_info *)data;
+	u8 iir, msr;
+	int ret;
+
+	ret = IRQ_NONE;
+
+	iir = h4p_inb(info, UART_IIR);
+	if (iir & UART_IIR_NO_INT)
+		return IRQ_HANDLED;
+
+	//BT_DBG("<%2x>", iir);
+
+	iir &= UART_IIR_ID;
+
+	if (iir == UART_IIR_MSI) {
+		msr = h4p_inb(info, UART_MSR);
+		ret = IRQ_HANDLED;
+	}
+	if (iir == UART_IIR_RLSI) {
+		h4p_inb(info, UART_RX);
+		h4p_inb(info, UART_LSR);
+		ret = IRQ_HANDLED;
+	}
+
+	if (iir == UART_IIR_RDI) {
+		h4p_rx_tasklet((unsigned long)data);
+		ret = IRQ_HANDLED;
+	}
+
+	if (iir == UART_IIR_THRI) {
+		h4p_tx_tasklet((unsigned long)data);
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static irqreturn_t h4p_wakeup_interrupt(int irq, void *dev_inst)
+{
+	struct h4p_info *info = dev_inst;
+	int should_wakeup;
+	struct hci_dev *hdev;
+
+	BT_DBG("[wakeup irq]");
+	
+	if (!info->hdev)
+		return IRQ_HANDLED;
+
+	should_wakeup = gpio_get_value(info->host_wakeup_gpio);
+	hdev = info->hdev;
+
+	if (!test_bit(HCI_RUNNING, &hdev->flags)) {
+		if (should_wakeup == 1)
+			complete_all(&info->test_completion);
+
+		printk("wakeup irq handled\n");
+
+		return IRQ_HANDLED;
+	}
+
+	BT_DBG("gpio interrupt %d", should_wakeup);
+
+	/* Check if wee have missed some interrupts */
+	if (info->rx_enabled == should_wakeup)
+		return IRQ_HANDLED;
+
+	if (should_wakeup)
+		h4p_enable_rx(info);
+	else
+		h4p_disable_rx(info);
+
+	return IRQ_HANDLED;
+}
+
+static inline void h4p_set_pm_limits(struct h4p_info *info, bool set)
+{
+	struct h4p_platform_data *bt_plat_data = info->dev->platform_data;
+
+	if (unlikely(!bt_plat_data || !bt_plat_data->set_pm_limits))
+		return;
+
+	if (set != !!test_bit(H4P_ACTIVE_MODE, &info->pm_flags)) {
+		bt_plat_data->set_pm_limits(info->dev, set);
+		if (set)
+			set_bit(H4P_ACTIVE_MODE, &info->pm_flags);
+		else
+			clear_bit(H4P_ACTIVE_MODE, &info->pm_flags);
+		BT_DBG("Change pm constraints to: %s", set ? "set" : "clear");
+		return;
+	}
+
+	BT_DBG("pm constraints remains: %s", set ? "set" : "clear");
+}
+
+static int h4p_reset(struct h4p_info *info)
+{
+	int err;
+
+	err = h4p_reset_uart(info);
+	if (err < 0) {
+		dev_err(info->dev, "Uart reset failed\n");
+		return err;
+	}
+	h4p_init_uart(info);
+	h4p_set_rts(info, 0);
+
+	gpio_set_value(info->reset_gpio, 0);
+	gpio_set_value(info->bt_wakeup_gpio, 1);
+	msleep(10);
+
+	if (gpio_get_value(info->host_wakeup_gpio) == 1) {
+		dev_err(info->dev, "host_wakeup_gpio not low\n");
+		return -EPROTO;
+	}
+
+	init_completion(&info->test_completion);
+	gpio_set_value(info->reset_gpio, 1);
+
+	if (!wait_for_completion_interruptible_timeout(&info->test_completion,
+						       msecs_to_jiffies(100))) {
+		dev_err(info->dev, "wakeup test timed out\n");
+		complete_all(&info->test_completion);
+		return -EPROTO;
+	}
+
+	err = h4p_wait_for_cts(info, 1, 100);
+	if (err < 0) {
+		dev_err(info->dev, "No cts from bt chip\n");
+		return err;
+	}
+
+	h4p_set_rts(info, 1);
+
+	return 0;
+}
+
+/* hci callback functions */
+static int h4p_hci_flush(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+
+	skb_queue_purge(&info->txq);
+
+	return 0;
+}
+
+static int h4p_bt_wakeup_test(struct h4p_info *info)
+{
+	/*
+	 * Test Sequence:
+	 * Host de-asserts the BT_WAKE_UP line.
+	 * Host polls the UART_CTS line, waiting for it to be de-asserted.
+	 * Host asserts the BT_WAKE_UP line.
+	 * Host polls the UART_CTS line, waiting for it to be asserted.
+	 * Host de-asserts the BT_WAKE_UP line (allow the Bluetooth device to
+	 * sleep).
+	 * Host polls the UART_CTS line, waiting for it to be de-asserted.
+	 */
+	int err;
+	int ret = -ECOMM;
+
+	if (!info)
+		return -EINVAL;
+
+	/* Disable wakeup interrupts */
+	disable_irq(gpio_to_irq(info->host_wakeup_gpio));
+
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	err = h4p_wait_for_cts(info, 0, 100);
+	if (err) {
+		dev_warn(info->dev,
+				"bt_wakeup_test: fail: CTS low timed out: %d\n",
+				err);
+		goto out;
+	}
+
+	gpio_set_value(info->bt_wakeup_gpio, 1);
+	err = h4p_wait_for_cts(info, 1, 100);
+	if (err) {
+		dev_warn(info->dev,
+				"bt_wakeup_test: fail: CTS high timed out: %d\n",
+				err);
+		goto out;
+	}
+
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	err = h4p_wait_for_cts(info, 0, 100);
+	if (err) {
+		dev_warn(info->dev,
+				"bt_wakeup_test: fail: CTS re-low timed out: %d\n",
+				err);
+		goto out;
+	}
+
+	ret = 0;
+
+out:
+
+	/* Re-enable wakeup interrupts */
+	enable_irq(gpio_to_irq(info->host_wakeup_gpio));
+
+	return ret;
+}
+
+static int h4p_setup(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+	int err;
+	unsigned long flags;
+
+	/*
+	 * Disable smart-idle as UART TX interrupts
+	 * are not wake-up capable
+	 */
+	h4p_smart_idle(info, 0);
+	
+	err = h4p_read_fw(info);
+	if (err < 0) {
+		dev_err(info->dev, "Cannot read firmware\n");
+		goto err_clean;
+	}
+
+	h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
+	h4p_set_rts(info, 0);
+	h4p_change_speed(info, BC4_MAX_BAUD_RATE);
+	h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
+
+	info->pm_enabled = 1;
+
+	err = h4p_bt_wakeup_test(info);
+	if (err < 0) {
+		dev_err(info->dev, "BT wakeup test failed.\n");
+		goto err_clean;
+	}
+
+	spin_lock_irqsave(&info->lock, flags);
+	info->rx_enabled = gpio_get_value(info->host_wakeup_gpio);
+	h4p_set_clk(info, &info->rx_clocks_en, info->rx_enabled);
+	spin_unlock_irqrestore(&info->lock, flags);
+
+	h4p_set_clk(info, &info->tx_clocks_en, 0);
+
+	kfree_skb(info->alive_cmd_skb);
+	info->alive_cmd_skb = NULL;
+	info->initing = 0;
+	return 0;
+
+err_clean:
+	printk("hci_setup: something failed, should do the clean up\n");
+	return err;
+}
+
+static int h4p_hci_setup(struct hci_dev *hdev)
+{
+	return 0;
+}
+
+static void hci_uninit(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+
+	h4p_reset_uart(info);
+	del_timer_sync(&info->lazy_release);
+	h4p_set_clk(info, &info->tx_clocks_en, 0);
+	h4p_set_clk(info, &info->rx_clocks_en, 0);
+	gpio_set_value(info->reset_gpio, 0);
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	kfree_skb(info->rx_skb);
+	info->rx_skb = NULL;
+}
+
+static int h4p_hci_open(struct hci_dev *hdev)
+{
+	struct h4p_info *info;
+	int err;
+
+	info = hci_get_drvdata(hdev);
+
+	if (test_bit(HCI_RUNNING, &hdev->flags))
+		return 0;
+
+	/* TI1271 has HW bug and boot up might fail. Original code retried 
+	   up to three times, but we removed TI1271 support. */
+
+	info->rx_enabled = 1;
+	info->rx_state = WAIT_FOR_PKT_TYPE;
+	info->rx_count = 0;
+	info->garbage_bytes = 0;
+	info->rx_skb = NULL;
+	info->pm_enabled = 0;
+	init_completion(&info->fw_completion);
+	h4p_set_clk(info, &info->tx_clocks_en, 1);
+	h4p_set_clk(info, &info->rx_clocks_en, 1);
+
+	err = h4p_reset(info);
+	if (err < 0)
+		goto err_clean;
+
+	h4p_set_auto_ctsrts(info, 1, UART_EFR_CTS | UART_EFR_RTS);
+	info->autorts = 1;
+
+	info->initing = 1;
+	printk("hci_setup\n");
+
+	err = h4p_send_negotiation(info);
+	set_bit(HCI_RUNNING, &hdev->flags);
+#if 0
+	err = h4p_setup(hdev);
+	if (err < 0) {
+		printk("h4p setup failed\n");
+		goto err_clean;
+	}
+#endif
+
+	atomic_set(&hdev->cmd_cnt, 1);
+	set_bit(HCI_INIT, &hdev->flags);
+	
+	return h4p_setup(hdev);
+
+err_clean:
+	printk("hci_open: something failed\n");
+	h4p_hci_flush(hdev);
+	hci_uninit(hdev);
+	kfree_skb(info->alive_cmd_skb);
+	info->alive_cmd_skb = NULL;
+
+	return err;
+}
+
+static int h4p_hci_close(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+
+	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
+		return 0;
+
+	h4p_hci_flush(hdev);
+	h4p_set_clk(info, &info->tx_clocks_en, 1);
+	h4p_set_clk(info, &info->rx_clocks_en, 1);
+	hci_uninit(hdev);
+	return 0;
+}
+
+static int h4p_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct h4p_info *info;
+	int err = 0;
+
+	BT_DBG("hci_send_frame: dev %p, skb %p\n", hdev, skb);
+
+	info = hci_get_drvdata(hdev);
+
+	if (!test_bit(HCI_RUNNING, &hdev->flags)) {
+		dev_warn(info->dev, "Frame for non-running device\n");
+		return -EIO;
+	}
+
+	switch (bt_cb(skb)->pkt_type) {
+	case HCI_COMMAND_PKT:
+		hdev->stat.cmd_tx++;
+		break;
+	case HCI_ACLDATA_PKT:
+		hdev->stat.acl_tx++;
+		break;
+	case HCI_SCODATA_PKT:
+		hdev->stat.sco_tx++;
+		break;
+	}
+
+	/* Push frame type to skb */
+	*skb_push(skb, 1) = (bt_cb(skb)->pkt_type);
+	/* We should always send word aligned data to h4+ devices */
+	if (skb->len % 2) {
+		err = skb_pad(skb, 1);
+		if (!err)
+			*skb_put(skb, 1) = 0x00;
+	}
+	if (err)
+		return err;
+
+	skb_queue_tail(&info->txq, skb);
+	if (!info->initing)
+		h4p_enable_tx(info);
+	else
+		h4p_enable_tx_nopm(info);
+
+	return 0;
+}
+
+static ssize_t h4p_hci_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+
+	printk("Set bdaddr... %pMR\n", bdaddr);
+	return 0;
+}
+
+static int h4p_register_hdev(struct h4p_info *info)
+{
+	struct hci_dev *hdev;
+
+	/* Initialize and register HCI device */
+
+	hdev = hci_alloc_dev();
+	if (!hdev) {
+		dev_err(info->dev, "Can't allocate memory for device\n");
+		return -ENOMEM;
+	}
+	info->hdev = hdev;
+
+	hdev->bus = HCI_UART;
+	hci_set_drvdata(hdev, info);
+
+	hdev->open = h4p_hci_open;
+	hdev->setup = h4p_hci_setup;
+	hdev->close = h4p_hci_close;
+	hdev->flush = h4p_hci_flush;
+	hdev->send = h4p_hci_send_frame;
+	hdev->set_bdaddr = h4p_hci_set_bdaddr;
+
+	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
+
+	SET_HCIDEV_DEV(hdev, info->dev);
+
+	if (hci_register_dev(hdev) >= 0)
+		return 0;
+
+	dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
+	hci_free_dev(info->hdev);
+	return -ENODEV;
+}
+
+static int h4p_probe_pdata(struct platform_device *pdev, struct h4p_info *info,
+			       struct h4p_platform_data *bt_plat_data)
+{
+	info->chip_type = bt_plat_data->chip_type;
+	info->bt_wakeup_gpio = bt_plat_data->bt_wakeup_gpio;
+	info->host_wakeup_gpio = bt_plat_data->host_wakeup_gpio;
+	info->reset_gpio = bt_plat_data->reset_gpio;
+	info->reset_gpio_shared = bt_plat_data->reset_gpio_shared;
+	info->bt_sysclk = bt_plat_data->bt_sysclk;
+
+	info->irq = bt_plat_data->uart_irq;
+	info->uart_base = devm_ioremap(&pdev->dev, bt_plat_data->uart_base,
+					SZ_2K);
+	info->uart_iclk = devm_clk_get(&pdev->dev, bt_plat_data->uart_iclk);
+	info->uart_fclk = devm_clk_get(&pdev->dev, bt_plat_data->uart_fclk);
+	return 0;
+}
+
+static int h4p_probe_dt(struct platform_device *pdev, struct h4p_info *info)
+{
+	struct device_node *node;
+	struct device_node *uart = pdev->dev.of_node;
+	u32 val;
+	struct resource *mem;	
+
+	node = of_get_child_by_name(uart, "device");
+
+	if (!node)
+		return -ENODATA;
+
+	info->chip_type = 3;	/* Bcm2048 */
+	
+	if (of_property_read_u32(node, "bt-sysclk", &val)) return -EINVAL;
+	info->bt_sysclk = val;
+
+	info->reset_gpio       = of_get_named_gpio(node, "reset-gpios", 0);
+	info->host_wakeup_gpio = of_get_named_gpio(node, "host-wakeup-gpios", 0);
+	info->bt_wakeup_gpio   = of_get_named_gpio(node, "bluetooth-wakeup-gpios", 0);	
+
+	if (!uart) {
+		dev_err(&pdev->dev, "UART link not provided\n");
+		return -EINVAL;
+	}
+
+	info->irq = irq_of_parse_and_map(uart, 0);
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	info->uart_base = devm_ioremap_resource(&pdev->dev, mem);
+
+	info->uart_iclk = of_clk_get_by_name(uart, "ick");
+	info->uart_fclk = of_clk_get_by_name(uart, "fck");	
+
+	printk("DT: have neccessary data\n");
+	return 0;
+}
+			  
+
+static int h4p_probe(struct platform_device *pdev)
+{
+
+	struct h4p_info *info;
+	int err;
+
+	dev_info(&pdev->dev, "Registering HCI H4P device\n");
+	info = devm_kzalloc(&pdev->dev, sizeof(struct h4p_info),
+			GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = &pdev->dev;
+	info->tx_enabled = 1;
+	info->rx_enabled = 1;
+	spin_lock_init(&info->lock);
+	spin_lock_init(&info->clocks_lock);
+	skb_queue_head_init(&info->txq);
+
+	if (pdev->dev.platform_data) {
+		err = h4p_probe_pdata(pdev, info, pdev->dev.platform_data);
+	} else {
+		err = h4p_probe_dt(pdev, info);
+	}
+	if (err) {
+		dev_err(&pdev->dev, "Could not get Bluetooth config data\n");
+		return -ENODATA;
+	}
+
+	printk("base/irq gpio: %lx/%d/%d\n",
+	       info->uart_base, info->irq);
+	printk("RESET/BTWU/HOSTWU gpio: %d/%d/%d\n",
+	       info->reset_gpio, info->bt_wakeup_gpio, info->host_wakeup_gpio);
+	printk("chip type, sysclk: %d/%d\n", info->chip_type, info->bt_sysclk);
+	printk("clock i/f: %lx/%lx\n", info->uart_iclk, info->uart_fclk);	
+
+	init_completion(&info->test_completion);
+	complete_all(&info->test_completion);
+
+	err = devm_gpio_request_one(&pdev->dev, info->reset_gpio,
+				    GPIOF_OUT_INIT_LOW, "bt_reset");
+	if (err < 0) {
+		dev_err(&pdev->dev, "Cannot get GPIO line %d\n",
+			info->reset_gpio);
+		return err;
+	}
+
+	err = devm_gpio_request_one(&pdev->dev, info->bt_wakeup_gpio,
+				    GPIOF_OUT_INIT_LOW, "bt_wakeup");
+	if (err < 0) {
+		dev_err(info->dev, "Cannot get GPIO line 0x%d",
+			info->bt_wakeup_gpio);
+		return err;
+	}
+
+	err = devm_gpio_request_one(&pdev->dev, info->host_wakeup_gpio,
+				    GPIOF_DIR_IN, "host_wakeup");
+	if (err < 0) {
+		dev_err(info->dev, "Cannot get GPIO line %d",
+		       info->host_wakeup_gpio);
+		return err;
+	}
+
+	err = devm_request_irq(&pdev->dev, info->irq, h4p_interrupt,
+				IRQF_DISABLED, "hci_h4p", info);
+	if (err < 0) {
+		dev_err(info->dev, "hci_h4p: unable to get IRQ %d\n",
+			info->irq);
+		return err;
+	}
+
+	err = devm_request_irq(&pdev->dev, gpio_to_irq(info->host_wakeup_gpio),
+			  h4p_wakeup_interrupt,  IRQF_TRIGGER_FALLING |
+			  IRQF_TRIGGER_RISING | IRQF_DISABLED,
+			  "h4p_wkup", info);
+	if (err < 0) {
+		dev_err(info->dev, "hci_h4p: unable to get wakeup IRQ %d\n",
+			  gpio_to_irq(info->host_wakeup_gpio));
+		return err;
+	}
+
+	err = irq_set_irq_wake(gpio_to_irq(info->host_wakeup_gpio), 1);
+	if (err < 0) {
+		dev_err(info->dev, "hci_h4p: unable to set wakeup for IRQ %d\n",
+				gpio_to_irq(info->host_wakeup_gpio));
+		return err;
+	}
+
+	init_timer_deferrable(&info->lazy_release);
+	info->lazy_release.function = h4p_lazy_clock_release;
+	info->lazy_release.data = (unsigned long)info;
+	h4p_set_clk(info, &info->tx_clocks_en, 1);
+	printk("resetting uart....\n");
+	err = h4p_reset_uart(info);
+	printk("reset ok....\n");
+	if (err < 0)
+		return err;
+	gpio_set_value(info->reset_gpio, 0);
+	h4p_set_clk(info, &info->tx_clocks_en, 0);
+
+	platform_set_drvdata(pdev, info);
+
+	if (h4p_register_hdev(info) < 0) {
+		dev_err(info->dev, "failed to register hci_h4p hci device\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int h4p_remove(struct platform_device *pdev)
+{
+	struct h4p_info *info;
+
+	info = platform_get_drvdata(pdev);
+
+	h4p_hci_close(info->hdev);
+	hci_unregister_dev(info->hdev);
+	hci_free_dev(info->hdev);
+
+	return 0;
+}
+
+static const struct of_device_id h4p_of_match[] = {
+	{ .compatible = "brcm,uart,bcm2048" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, h4p_of_match);
+
+static struct platform_driver h4p_driver = {
+	.probe		= h4p_probe,
+	.remove		= h4p_remove,
+	.driver		= {
+		.name	= "disabled" "hci_h4p",
+		.owner  = THIS_MODULE,
+		.of_match_table = of_match_ptr(h4p_of_match),
+	},
+};
+
+module_platform_driver(h4p_driver);
+
+MODULE_ALIAS("platform:hci_h4p");
+MODULE_DESCRIPTION("Bluetooth h4 driver with nokia extensions");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ville Tervo");
diff --git a/drivers/bluetooth/nokia_fw-bcm.c b/drivers/bluetooth/nokia_fw-bcm.c
new file mode 100644
index 0000000..fd88727
--- /dev/null
+++ b/drivers/bluetooth/nokia_fw-bcm.c
@@ -0,0 +1,27 @@ 
+/*
+ * This file is part of Nokia H4P bluetooth driver
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/skbuff.h>
+#include <linux/delay.h>
+#include <linux/serial_reg.h>
+
+#include "hci_h4p.h"
+
diff --git a/drivers/bluetooth/nokia_fw.c b/drivers/bluetooth/nokia_fw.c
new file mode 100644
index 0000000..7b6a750
--- /dev/null
+++ b/drivers/bluetooth/nokia_fw.c
@@ -0,0 +1,105 @@ 
+/*
+ * This file is part of hci_h4p bluetooth driver
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation.
+ * Copyright (C) 2014 Pavel Machek <[e-mail]>
+ *
+ * Contact: Ville Tervo <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/firmware.h>
+#include <linux/clk.h>
+
+#include <net/bluetooth/bluetooth.h>
+
+#include "hci_h4p.h"
+
+#define FW_NAME_BCM2048		"bcmfw.bin"
+
+#define BT_DBG printk
+
+
+/* Read fw. Return length of the command. If no more commands in
+ * fw 0 is returned. In error case return value is negative.
+ */
+int h4p_read_fw(struct h4p_info *info)
+{
+	int num = 0;
+	int fw_pos = 0;
+	struct sk_buff *skb;
+	const struct firmware *fw_entry = NULL;
+	int err = -ENOENT;
+	unsigned int cmd_len = 0;	
+
+	err = request_firmware(&fw_entry, FW_NAME_BCM2048, info->dev);
+	if (err != 0 || !fw_entry)
+		return err;
+
+	while(1) {
+		int cmd, len;
+
+		fw_pos += cmd_len;		
+		
+		if (fw_pos >= fw_entry->size)
+			break;
+
+		if (fw_pos + 2 > fw_entry->size) {
+			dev_err(info->dev, "Corrupted firmware image 1\n");
+			err = -EMSGSIZE;
+			break;
+		}
+
+		cmd_len = fw_entry->data[fw_pos++];
+		cmd_len += fw_entry->data[fw_pos++] << 8;
+		if (cmd_len == 0)
+			break;
+
+		if (fw_pos + cmd_len > fw_entry->size) {
+			dev_err(info->dev, "Corrupted firmware image 2\n");
+			err = -EMSGSIZE;
+			break;
+		}
+
+		/* Skip first two packets */
+		if (++num <= 2)
+			continue;
+
+		/* Note that this is timing-critical. If sending packets takes too
+		   long, initialization will fail. */
+		printk("Packet %d...", num);
+
+		cmd = fw_entry->data[fw_pos+1];
+		cmd += fw_entry->data[fw_pos+2] << 8;
+		len = fw_entry->data[fw_pos+3];
+		printk("cmd %x, len %d.", cmd, len);
+
+		skb = __hci_cmd_sync(info->hdev, cmd, len, fw_entry->data+fw_pos+4, 500);
+		if (IS_ERR(skb)) {
+			dev_err(info->dev, "...sending cmd failed %d\n", PTR_ERR(skb));
+			err = -EIO;
+			break;
+		}
+	}
+
+	release_firmware(fw_entry);
+	return err;
+}
+
+MODULE_FIRMWARE(FW_NAME_BCM2048);
diff --git a/drivers/bluetooth/nokia_uart.c b/drivers/bluetooth/nokia_uart.c
new file mode 100644
index 0000000..2cae639
--- /dev/null
+++ b/drivers/bluetooth/nokia_uart.c
@@ -0,0 +1,179 @@ 
+/*
+ * This file is part of Nokia H4P bluetooth driver
+ *
+ * Copyright (C) 2005, 2006 Nokia Corporation.
+ * Copyright (C) 2014 Pavel Machek <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/clk.h>
+
+#include <linux/io.h>
+
+#include "hci_h4p.h"
+
+
+
+int h4p_wait_for_cts(struct h4p_info *info, int active,
+			 int timeout_ms)
+{
+	unsigned long timeout;
+	int state;
+
+	timeout = jiffies + msecs_to_jiffies(timeout_ms);
+	for (;;) {
+		state = h4p_inb(info, UART_MSR) & UART_MSR_CTS;
+		if (active) {
+			if (state)
+				return 0;
+		} else {
+			if (!state)
+				return 0;
+		}
+		if (time_after(jiffies, timeout))
+			return -ETIMEDOUT;
+		msleep(1);
+	}
+}
+
+void __h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which)
+{
+	u8 lcr, b;
+
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, 0xbf);
+	b = h4p_inb(info, UART_EFR);
+	if (on)
+		b |= which;
+	else
+		b &= ~which;
+	h4p_outb(info, UART_EFR, b);
+	h4p_outb(info, UART_LCR, lcr);
+}
+
+void h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->lock, flags);
+	__h4p_set_auto_ctsrts(info, on, which);
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+void h4p_change_speed(struct h4p_info *info, unsigned long speed)
+{
+	unsigned int divisor;
+	u8 lcr, mdr1;
+
+	BT_DBG("Setting speed %lu", speed);
+
+	if (speed >= 460800) {
+		divisor = UART_CLOCK / 13 / speed;
+		mdr1 = 3;
+	} else {
+		divisor = UART_CLOCK / 16 / speed;
+		mdr1 = 0;
+	}
+
+	/* Make sure UART mode is disabled */
+	h4p_outb(info, UART_OMAP_MDR1, 7);
+
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, UART_LCR_DLAB);     /* Set DLAB */
+	h4p_outb(info, UART_DLL, divisor & 0xff);    /* Set speed */
+	h4p_outb(info, UART_DLM, divisor >> 8);
+	h4p_outb(info, UART_LCR, lcr);
+
+	/* Make sure UART mode is enabled */
+	h4p_outb(info, UART_OMAP_MDR1, mdr1);
+}
+
+int h4p_reset_uart(struct h4p_info *info)
+{
+	int count = 0;
+
+	/* Reset the UART */
+	h4p_outb(info, UART_OMAP_SYSC, UART_SYSC_OMAP_RESET);
+	while (!(h4p_inb(info, UART_OMAP_SYSS) & UART_SYSS_RESETDONE)) {
+		if (count++ > 100) {
+			dev_err(info->dev, "hci_h4p: UART reset timeout\n");
+			return -ENODEV;
+		}
+		udelay(1);
+	}
+
+	return 0;
+}
+
+void h4p_store_regs(struct h4p_info *info)
+{
+	u16 lcr = 0;
+
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, 0xBF);
+	info->dll = h4p_inb(info, UART_DLL);
+	info->dlh = h4p_inb(info, UART_DLM);
+	info->efr = h4p_inb(info, UART_EFR);
+	h4p_outb(info, UART_LCR, lcr);
+	info->mdr1 = h4p_inb(info, UART_OMAP_MDR1);
+	info->ier = h4p_inb(info, UART_IER);
+}
+
+void h4p_restore_regs(struct h4p_info *info)
+{
+	u16 lcr = 0;
+
+	h4p_init_uart(info);
+
+	h4p_outb(info, UART_OMAP_MDR1, 7);
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, 0xBF);
+	h4p_outb(info, UART_DLL, info->dll);    /* Set speed */
+	h4p_outb(info, UART_DLM, info->dlh);
+	h4p_outb(info, UART_EFR, info->efr);
+	h4p_outb(info, UART_LCR, lcr);
+	h4p_outb(info, UART_OMAP_MDR1, info->mdr1);
+	h4p_outb(info, UART_IER, info->ier);
+}
+
+void h4p_init_uart(struct h4p_info *info)
+{
+	u8 mcr, efr;
+
+	/* Enable and setup FIFO */
+	h4p_outb(info, UART_OMAP_MDR1, 0x00);
+
+	h4p_outb(info, UART_LCR, 0xbf);
+	efr = h4p_inb(info, UART_EFR);
+	h4p_outb(info, UART_EFR, UART_EFR_ECB);
+	h4p_outb(info, UART_LCR, UART_LCR_DLAB);
+	mcr = h4p_inb(info, UART_MCR);
+	h4p_outb(info, UART_MCR, UART_MCR_TCRTLR);
+	h4p_outb(info, UART_FCR, UART_FCR_ENABLE_FIFO |
+			UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
+			(3 << 6) | (0 << 4));
+	h4p_outb(info, UART_LCR, 0xbf);
+	h4p_outb(info, UART_TI752_TLR, 0xed);
+	h4p_outb(info, UART_TI752_TCR, 0xef);
+	h4p_outb(info, UART_EFR, efr);
+	h4p_outb(info, UART_LCR, UART_LCR_DLAB);
+	h4p_outb(info, UART_MCR, 0x00);
+	h4p_outb(info, UART_LCR, UART_LCR_WLEN8);
+	h4p_outb(info, UART_IER, UART_IER_RDI);
+	h4p_outb(info, UART_OMAP_SYSC, (1 << 0) | (1 << 2) | (2 << 3));
+}
diff --git a/include/linux/platform_data/bt-nokia-h4p.h b/include/linux/platform_data/bt-nokia-h4p.h
index 30d169d..c1a7e64 100644
--- a/include/linux/platform_data/bt-nokia-h4p.h
+++ b/include/linux/platform_data/bt-nokia-h4p.h
@@ -21,9 +21,9 @@ 
 
 
 /**
- * struct hci_h4p_platform data - hci_h4p Platform data structure
+ * struct h4p_platform data - hci_h4p Platform data structure
  */
-struct hci_h4p_platform_data {
+struct h4p_platform_data {
 	int chip_type;
 	int bt_sysclk;
 	unsigned int bt_wakeup_gpio;