| Message ID | 1349089282-22105-1-git-send-email-sourav.poddar@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi, On Mon, Oct 1, 2012 at 4:31 PM, Sourav Poddar <sourav.poddar@ti.com> wrote: > smsc ece1099 is a keyboard scan or gpio expansion device. > The patch create keypad and gpio expander child for this > multi function smsc driver. > > Tested on omap5430 evm with 3.6-rc6 custom kernel. Can we have this line in comment section and not in commit log? > > Cc: Samuel Ortiz <sameo@linux.intel.com> > Cc: Benoit Cousson <b-cousson@ti.com> > Cc: Felipe Balbi <balbi@ti.com> > Cc: Santosh Shilimkar <santosh.shilimkar@ti.com> > Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> > --- > Changes since v2: > - Change the cache type, max register assignment > - remove of_device_table, since i2c based device gets > probed according to i2c_device_id through dt. > - Modify the remove function > - Minor return patch cleanups. > Documentation/smsc_ece1099.txt | 56 ++++++++++++++++++++ > drivers/mfd/Kconfig | 12 ++++ > drivers/mfd/Makefile | 1 + > drivers/mfd/smsc-ece1099.c | 113 ++++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/smsc.h | 109 ++++++++++++++++++++++++++++++++++++++ > 5 files changed, 291 insertions(+), 0 deletions(-) > create mode 100644 Documentation/smsc_ece1099.txt > create mode 100644 drivers/mfd/smsc-ece1099.c > create mode 100644 include/linux/mfd/smsc.h > > diff --git a/Documentation/smsc_ece1099.txt b/Documentation/smsc_ece1099.txt > new file mode 100644 > index 0000000..6b492e8 > --- /dev/null > +++ b/Documentation/smsc_ece1099.txt > @@ -0,0 +1,56 @@ > +What is smsc-ece1099? > +---------------------- > + > +The ECE1099 is a 40-Pin 3.3V Keyboard Scan Expansion > +or GPIO Expansion device. The device supports a keyboard > +scan matrix of 23x8. The device is connected to a Master > +via the SMSC BC-Link interface or via the SMBus. > +Keypad scan Input(KSI) and Keypad Scan Output(KSO) signals > +are multiplexed with GPIOs. > + > +Interrupt generation > +-------------------- > + > +Interrupts can be generated by an edge detection on a GPIO > +pin or an edge detection on one of the bus interface pins. > +Interrupts can also be detected on the keyboard scan interface. > +The bus interrupt pin (BC_INT# or SMBUS_INT#) is asserted if > +any bit in one of the Interrupt Status registers is 1 and > +the corresponding Interrupt Mask bit is also 1. > + > +In order for software to determine which device is the source > +of an interrupt, it should first read the Group Interrupt Status Register > +to determine which Status register group is a source for the interrupt. > +Software should read both the Status register and the associated Mask register, > +then AND the two values together. Bits that are 1 in the result of the AND > +are active interrupts. Software clears an interrupt by writing a 1 to the > +corresponding bit in the Status register. > + > +Communication Protocol > +---------------------- > + > +- SMbus slave Interface > + The host processor communicates with the ECE1099 device > + through a series of read/write registers via the SMBus > + interface. SMBus is a serial communication protocol between > + a computer host and its peripheral devices. The SMBus data > + rate is 10KHz minimum to 400 KHz maximum > + > +- Slave Bus Interface > + The ECE1099 device SMBus implementation is a subset of the > + SMBus interface to the host. The device is a slave-only SMBus device. > + The implementation in the device is a subset of SMBus since it > + only supports four protocols. > + > + The Write Byte, Read Byte, Send Byte, and Receive Byte protocols are the > + only valid SMBus protocols for the device. > + > +- BC-LinkTM Interface > + The BC-Link is a proprietary bus that allows communication > + between a Master device and a Companion device. The Master > + device uses this serial bus to read and write registers > + located on the Companion device. The bus comprises three signals, > + BC_CLK, BC_DAT and BC_INT#. The Master device always provides the > + clock, BC_CLK, and the Companion device is the source for an > + independent asynchronous interrupt signal, BC_INT#. The ECE1099 > + supports BC-Link speeds up to 24MHz. > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index b1a1462..dedc874 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -385,6 +385,18 @@ config MFD_T7L66XB > help > Support for Toshiba Mobile IO Controller T7L66XB > > +config MFD_SMSC > + bool "Support for the SMSC ECE1099 series chips" > + depends on I2C=y > + select MFD_CORE > + select REGMAP_I2C > + help > + If you say yes here you get support for the > + ece1099 chips from SMSC. > + > + To compile this driver as a module, choose M here: the > + module will be called smsc. *bool* attribute for MFD_SMSC, does not allow to select the driver as module. use *trisate* instead. > + > config MFD_TC6387XB > bool "Support Toshiba TC6387XB" > depends on ARM && HAVE_CLK > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index 79dd22d..3323345 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -77,6 +77,7 @@ obj-$(CONFIG_EZX_PCAP) += ezx-pcap.o > obj-$(CONFIG_MCP) += mcp-core.o > obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o > obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o > +obj-$(CONFIG_MFD_SMSC) += smsc-ece1099.o > obj-$(CONFIG_MCP_UCB1200_TS) += ucb1x00-ts.o > > ifeq ($(CONFIG_SA1100_ASSABET),y) > diff --git a/drivers/mfd/smsc-ece1099.c b/drivers/mfd/smsc-ece1099.c > new file mode 100644 > index 0000000..220aec2 > --- /dev/null > +++ b/drivers/mfd/smsc-ece1099.c > @@ -0,0 +1,113 @@ > +/* > + * TI SMSC MFD Driver > + * > + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com > + * > + * Author: Sourav Poddar <sourav.poddar@ti.com> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; GPL v2. > + * > + */ > + > +#include <linux/module.h> > +#include <linux/moduleparam.h> > +#include <linux/init.h> > +#include <linux/slab.h> > +#include <linux/i2c.h> > +#include <linux/gpio.h> > +#include <linux/workqueue.h> > +#include <linux/irq.h> > +#include <linux/regmap.h> > +#include <linux/err.h> > +#include <linux/mfd/core.h> > +#include <linux/mfd/smsc.h> > +#include <linux/of_platform.h> > + > +static struct regmap_config smsc_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > + .max_register = SMSC_VEN_ID_H, > + .cache_type = REGCACHE_RBTREE, > +}; > + > +static int smsc_i2c_probe(struct i2c_client *i2c, > + const struct i2c_device_id *id) > +{ > + struct device_node *node = i2c->dev.of_node; > + struct smsc *smsc; > + int devid, rev, venid_l, venid_h; > + int ret = 0; > + > + smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc), > + GFP_KERNEL); > + if (!smsc) { > + dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n"); > + return -ENOMEM; > + } > + > + smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config); > + if (IS_ERR(smsc->regmap)) { > + ret = PTR_ERR(smsc->regmap); > + goto err; > + } > + > + i2c_set_clientdata(i2c, smsc); > + smsc->dev = &i2c->dev; > + > +#ifdef CONFIG_OF > + of_property_read_u32(node, "clock", &smsc->clk); This functions need not come under macro. > +#endif > + > + regmap_read(smsc->regmap, SMSC_DEV_ID, &devid); > + regmap_read(smsc->regmap, SMSC_DEV_REV, &rev); > + regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l); > + regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h); > + > + dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n", > + devid, rev, (venid_h << 8) | venid_l); dev_info makes the boot noisy. > + > + ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk); > + if (ret) > + goto err; > + > +#ifdef CONFIG_OF > + if (node) > + ret = of_platform_populate(node, NULL, NULL, &i2c->dev); of_platform_populate() need not come under macro. > +#endif > + > +err: > + return ret; > +} > + > +static int smsc_i2c_remove(struct i2c_client *i2c) > +{ > + struct smsc *smsc = i2c_get_clientdata(i2c); > + > + mfd_remove_devices(smsc->dev); IMO, this should have resulted in an abort (hint: see mfd_remove_devices_fn()). Trying to do mfd_remove_devices without mfd_add_devices(). Use device_for_each_child here to remove the device. Thanks Kishon
On Mon, Oct 01, 2012 at 05:00:06PM +0530, ABRAHAM, KISHON VIJAY wrote: > On Mon, Oct 1, 2012 at 4:31 PM, Sourav Poddar <sourav.poddar@ti.com> wrote: Delete irrelevant context from your replies, it makes it much easier to find new text. > > +static int smsc_i2c_remove(struct i2c_client *i2c) > > +{ > > + struct smsc *smsc = i2c_get_clientdata(i2c); > > + > > + mfd_remove_devices(smsc->dev); > IMO, this should have resulted in an abort (hint: see > mfd_remove_devices_fn()). Trying to do mfd_remove_devices without > mfd_add_devices(). Use device_for_each_child here to remove the > device. No, this is not at all sensible - if there's an mfd_remove_devices() function we really ought to be able to use it to remove the children. If we can't do that we should fix the API usability, not open code the same stuff in every user.
Hi, On Mon, Oct 1, 2012 at 5:14 PM, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote: > On Mon, Oct 01, 2012 at 05:00:06PM +0530, ABRAHAM, KISHON VIJAY wrote: >> On Mon, Oct 1, 2012 at 4:31 PM, Sourav Poddar <sourav.poddar@ti.com> wrote: > > Delete irrelevant context from your replies, it makes it much easier to > find new text. > >> > +static int smsc_i2c_remove(struct i2c_client *i2c) >> > +{ >> > + struct smsc *smsc = i2c_get_clientdata(i2c); >> > + >> > + mfd_remove_devices(smsc->dev); > >> IMO, this should have resulted in an abort (hint: see >> mfd_remove_devices_fn()). Trying to do mfd_remove_devices without >> mfd_add_devices(). Use device_for_each_child here to remove the >> device. > > No, this is not at all sensible - if there's an mfd_remove_devices() > function we really ought to be able to use it to remove the children. > If we can't do that we should fix the API usability, not open code the > same stuff in every user. What makes more sense to me is extend mfd_add_devices to create child devices from dt data. Then for removing devices, one can use mfd_remove_devices(). Thanks Kishon
Hi Sourav, On Mon, Oct 01, 2012 at 04:31:22PM +0530, Sourav Poddar wrote: > smsc ece1099 is a keyboard scan or gpio expansion device. > The patch create keypad and gpio expander child for this > multi function smsc driver. > > Tested on omap5430 evm with 3.6-rc6 custom kernel. > > Cc: Samuel Ortiz <sameo@linux.intel.com> > Cc: Benoit Cousson <b-cousson@ti.com> > Cc: Felipe Balbi <balbi@ti.com> > Cc: Santosh Shilimkar <santosh.shilimkar@ti.com> > Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> > --- > Changes since v2: > - Change the cache type, max register assignment > - remove of_device_table, since i2c based device gets > probed according to i2c_device_id through dt. > - Modify the remove function > - Minor return patch cleanups. > Documentation/smsc_ece1099.txt | 56 ++++++++++++++++++++ > drivers/mfd/Kconfig | 12 ++++ > drivers/mfd/Makefile | 1 + > drivers/mfd/smsc-ece1099.c | 113 ++++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/smsc.h | 109 ++++++++++++++++++++++++++++++++++++++ > 5 files changed, 291 insertions(+), 0 deletions(-) > create mode 100644 Documentation/smsc_ece1099.txt > create mode 100644 drivers/mfd/smsc-ece1099.c > create mode 100644 include/linux/mfd/smsc.h Applied with a warning fix for the !CONFIG_OF case. Cheers, Samuel.
On Mon, Oct 01, 2012 at 05:23:15PM +0530, ABRAHAM, KISHON VIJAY wrote: > On Mon, Oct 1, 2012 at 5:14 PM, Mark Brown > > No, this is not at all sensible - if there's an mfd_remove_devices() > > function we really ought to be able to use it to remove the children. > > If we can't do that we should fix the API usability, not open code the > > same stuff in every user. > What makes more sense to me is extend mfd_add_devices to create child > devices from dt data. Then for removing devices, one can use > mfd_remove_devices(). Why would that be helpful? Most platforms don't support DT at all, and having the API behave differently depending on the platform doesn't seem like a step forwards. I would really expect any usage of DT to be totally orthogonal here.
Hi, On Mon, Oct 1, 2012 at 5:39 PM, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote: > On Mon, Oct 01, 2012 at 05:23:15PM +0530, ABRAHAM, KISHON VIJAY wrote: >> On Mon, Oct 1, 2012 at 5:14 PM, Mark Brown > >> > No, this is not at all sensible - if there's an mfd_remove_devices() >> > function we really ought to be able to use it to remove the children. >> > If we can't do that we should fix the API usability, not open code the >> > same stuff in every user. > >> What makes more sense to me is extend mfd_add_devices to create child >> devices from dt data. Then for removing devices, one can use >> mfd_remove_devices(). > > Why would that be helpful? Most platforms don't support DT at all, and I'm not sure how to put it correctly. All I'm trying to tell is mfd is a framework that exposes a set of API's to create and remove a device among others. If a mfd child device is not created using mfd API, it'll be unfair to expect that child be removed properly using mfd API. Like in this patch, the device is created using of_platform_populate (not a mfd API) but is removed using mfd_remove_devices (mfd API) [which should result in an abort]. This means mfd framework does not have an API to create a device from dt data or so do I think since of_platform_populate() is used. Thats why I suggested the idea of extending mfd_add_devices() (or adding a new API in mfd framework) to create child devices from dt data so that we'll have API's in mfd framework to both create and delete a device. Thanks Kishon
On Mon, Oct 01, 2012 at 08:54:23PM +0530, ABRAHAM, KISHON VIJAY wrote: > On Mon, Oct 1, 2012 at 5:39 PM, Mark Brown > > Why would that be helpful? Most platforms don't support DT at all, and > I'm not sure how to put it correctly. All I'm trying to tell is mfd is > a framework that exposes a set of API's to create and remove a device > among others. If a mfd child device is not created using mfd API, > it'll be unfair to expect that child be removed properly using mfd > API. Like in this patch, the device is created using > of_platform_populate (not a mfd API) but is removed using > mfd_remove_devices (mfd API) [which should result in an abort]. That doesn't sound terribly clever, no, though it's not immediately clear to me if the non-clever bit is using mfd_remove_devices() or of_platform_populate(). > This means mfd framework does not have an API to create a device from > dt data or so do I think since of_platform_populate() is used. Thats > why I suggested the idea of extending mfd_add_devices() (or adding a > new API in mfd framework) to create child devices from dt data so that > we'll have API's in mfd framework to both create and delete a device. The trouble that always exists with representing MFD children in DT is that unless you've got a usefully reusable IP block which is clearly separate from the chip integration you end up essentially just dumping the Linux data structures into DT which often doesn't leave you with something which describes the hardware.
Hi, coming late to the discussion, so bear with me On Tue, Oct 02, 2012 at 01:38:56PM +0100, Mark Brown wrote: > > This means mfd framework does not have an API to create a device from > > dt data or so do I think since of_platform_populate() is used. Thats > > why I suggested the idea of extending mfd_add_devices() (or adding a > > new API in mfd framework) to create child devices from dt data so that > > we'll have API's in mfd framework to both create and delete a device. > > The trouble that always exists with representing MFD children in DT is > that unless you've got a usefully reusable IP block which is clearly > separate from the chip integration you end up essentially just dumping > the Linux data structures into DT which often doesn't leave you with > something which describes the hardware. do you mean to say that children creation should be left into the driver (outside dt) ? That should be doable, indeed. BTW, OTOH writing all children into the DT actually describes the HW, no ? And depending on the device I feel it'd be better to write that data to DT. Think of twlxxxx (TI's PMICs), we might have completely unrelated drivers using one of TWL's GPIO lines as an interrupt source. If that particular children isn't listed in DT, it can't be used as an interrupt-parent, right ?
On Tue, Oct 02, 2012 at 03:43:22PM +0300, Felipe Balbi wrote: > BTW, OTOH writing all children into the DT actually describes the HW, > no ? And depending on the device I feel it'd be better to write that Well, it depends on the hardware. Some hardware has a bunch of nice, neat IPs which can usefully be reproduced and which map sensibly onto OS abstractions but a lot of it doesn't and frequently the abstractions which Linux wants to use don't bear a huge resemblance to the hardware (and Linux's ideas can change over time, as with the clock API being factored out for example). > data to DT. Think of twlxxxx (TI's PMICs), we might have completely > unrelated drivers using one of TWL's GPIO lines as an interrupt source. > If that particular children isn't listed in DT, it can't be used as an > interrupt-parent, right ? You can have the interrupt controller there without having to list every IP in the device, just make the parent device the interrupt controller to DT.
Hi, On Tue, Oct 02, 2012 at 01:58:20PM +0100, Mark Brown wrote: > On Tue, Oct 02, 2012 at 03:43:22PM +0300, Felipe Balbi wrote: > > > BTW, OTOH writing all children into the DT actually describes the HW, > > no ? And depending on the device I feel it'd be better to write that > > Well, it depends on the hardware. Some hardware has a bunch of nice, > neat IPs which can usefully be reproduced and which map sensibly onto OS > abstractions but a lot of it doesn't and frequently the abstractions > which Linux wants to use don't bear a huge resemblance to the hardware > (and Linux's ideas can change over time, as with the clock API being > factored out for example). > > > data to DT. Think of twlxxxx (TI's PMICs), we might have completely > > unrelated drivers using one of TWL's GPIO lines as an interrupt source. > > > If that particular children isn't listed in DT, it can't be used as an > > interrupt-parent, right ? > > You can have the interrupt controller there without having to list every > IP in the device, just make the parent device the interrupt controller > to DT. fair enough, thanks ;-)
Hi, On Tue, Oct 2, 2012 at 6:08 PM, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote: > On Mon, Oct 01, 2012 at 08:54:23PM +0530, ABRAHAM, KISHON VIJAY wrote: >> On Mon, Oct 1, 2012 at 5:39 PM, Mark Brown > >> > Why would that be helpful? Most platforms don't support DT at all, and > >> I'm not sure how to put it correctly. All I'm trying to tell is mfd is >> a framework that exposes a set of API's to create and remove a device >> among others. If a mfd child device is not created using mfd API, >> it'll be unfair to expect that child be removed properly using mfd >> API. Like in this patch, the device is created using >> of_platform_populate (not a mfd API) but is removed using >> mfd_remove_devices (mfd API) [which should result in an abort]. > > That doesn't sound terribly clever, no, though it's not immediately > clear to me if the non-clever bit is using mfd_remove_devices() or > of_platform_populate(). > >> This means mfd framework does not have an API to create a device from >> dt data or so do I think since of_platform_populate() is used. Thats >> why I suggested the idea of extending mfd_add_devices() (or adding a >> new API in mfd framework) to create child devices from dt data so that >> we'll have API's in mfd framework to both create and delete a device. > > The trouble that always exists with representing MFD children in DT is > that unless you've got a usefully reusable IP block which is clearly > separate from the chip integration you end up essentially just dumping > the Linux data structures into DT which often doesn't leave you with > something which describes the hardware. indeed! Thanks Kishon
diff --git a/Documentation/smsc_ece1099.txt b/Documentation/smsc_ece1099.txt new file mode 100644 index 0000000..6b492e8 --- /dev/null +++ b/Documentation/smsc_ece1099.txt @@ -0,0 +1,56 @@ +What is smsc-ece1099? +---------------------- + +The ECE1099 is a 40-Pin 3.3V Keyboard Scan Expansion +or GPIO Expansion device. The device supports a keyboard +scan matrix of 23x8. The device is connected to a Master +via the SMSC BC-Link interface or via the SMBus. +Keypad scan Input(KSI) and Keypad Scan Output(KSO) signals +are multiplexed with GPIOs. + +Interrupt generation +-------------------- + +Interrupts can be generated by an edge detection on a GPIO +pin or an edge detection on one of the bus interface pins. +Interrupts can also be detected on the keyboard scan interface. +The bus interrupt pin (BC_INT# or SMBUS_INT#) is asserted if +any bit in one of the Interrupt Status registers is 1 and +the corresponding Interrupt Mask bit is also 1. + +In order for software to determine which device is the source +of an interrupt, it should first read the Group Interrupt Status Register +to determine which Status register group is a source for the interrupt. +Software should read both the Status register and the associated Mask register, +then AND the two values together. Bits that are 1 in the result of the AND +are active interrupts. Software clears an interrupt by writing a 1 to the +corresponding bit in the Status register. + +Communication Protocol +---------------------- + +- SMbus slave Interface + The host processor communicates with the ECE1099 device + through a series of read/write registers via the SMBus + interface. SMBus is a serial communication protocol between + a computer host and its peripheral devices. The SMBus data + rate is 10KHz minimum to 400 KHz maximum + +- Slave Bus Interface + The ECE1099 device SMBus implementation is a subset of the + SMBus interface to the host. The device is a slave-only SMBus device. + The implementation in the device is a subset of SMBus since it + only supports four protocols. + + The Write Byte, Read Byte, Send Byte, and Receive Byte protocols are the + only valid SMBus protocols for the device. + +- BC-LinkTM Interface + The BC-Link is a proprietary bus that allows communication + between a Master device and a Companion device. The Master + device uses this serial bus to read and write registers + located on the Companion device. The bus comprises three signals, + BC_CLK, BC_DAT and BC_INT#. The Master device always provides the + clock, BC_CLK, and the Companion device is the source for an + independent asynchronous interrupt signal, BC_INT#. The ECE1099 + supports BC-Link speeds up to 24MHz. diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b1a1462..dedc874 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -385,6 +385,18 @@ config MFD_T7L66XB help Support for Toshiba Mobile IO Controller T7L66XB +config MFD_SMSC + bool "Support for the SMSC ECE1099 series chips" + depends on I2C=y + select MFD_CORE + select REGMAP_I2C + help + If you say yes here you get support for the + ece1099 chips from SMSC. + + To compile this driver as a module, choose M here: the + module will be called smsc. + config MFD_TC6387XB bool "Support Toshiba TC6387XB" depends on ARM && HAVE_CLK diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 79dd22d..3323345 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_EZX_PCAP) += ezx-pcap.o obj-$(CONFIG_MCP) += mcp-core.o obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o +obj-$(CONFIG_MFD_SMSC) += smsc-ece1099.o obj-$(CONFIG_MCP_UCB1200_TS) += ucb1x00-ts.o ifeq ($(CONFIG_SA1100_ASSABET),y) diff --git a/drivers/mfd/smsc-ece1099.c b/drivers/mfd/smsc-ece1099.c new file mode 100644 index 0000000..220aec2 --- /dev/null +++ b/drivers/mfd/smsc-ece1099.c @@ -0,0 +1,113 @@ +/* + * TI SMSC MFD Driver + * + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com + * + * Author: Sourav Poddar <sourav.poddar@ti.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; GPL v2. + * + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/workqueue.h> +#include <linux/irq.h> +#include <linux/regmap.h> +#include <linux/err.h> +#include <linux/mfd/core.h> +#include <linux/mfd/smsc.h> +#include <linux/of_platform.h> + +static struct regmap_config smsc_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = SMSC_VEN_ID_H, + .cache_type = REGCACHE_RBTREE, +}; + +static int smsc_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct device_node *node = i2c->dev.of_node; + struct smsc *smsc; + int devid, rev, venid_l, venid_h; + int ret = 0; + + smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc), + GFP_KERNEL); + if (!smsc) { + dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n"); + return -ENOMEM; + } + + smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config); + if (IS_ERR(smsc->regmap)) { + ret = PTR_ERR(smsc->regmap); + goto err; + } + + i2c_set_clientdata(i2c, smsc); + smsc->dev = &i2c->dev; + +#ifdef CONFIG_OF + of_property_read_u32(node, "clock", &smsc->clk); +#endif + + regmap_read(smsc->regmap, SMSC_DEV_ID, &devid); + regmap_read(smsc->regmap, SMSC_DEV_REV, &rev); + regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l); + regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h); + + dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n", + devid, rev, (venid_h << 8) | venid_l); + + ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk); + if (ret) + goto err; + +#ifdef CONFIG_OF + if (node) + ret = of_platform_populate(node, NULL, NULL, &i2c->dev); +#endif + +err: + return ret; +} + +static int smsc_i2c_remove(struct i2c_client *i2c) +{ + struct smsc *smsc = i2c_get_clientdata(i2c); + + mfd_remove_devices(smsc->dev); + + return 0; +} + +static const struct i2c_device_id smsc_i2c_id[] = { + { "smscece1099", 0}, + {}, +}; +MODULE_DEVICE_TABLE(i2c, smsc_i2c_id); + +static struct i2c_driver smsc_i2c_driver = { + .driver = { + .name = "smsc", + .owner = THIS_MODULE, + }, + .probe = smsc_i2c_probe, + .remove = smsc_i2c_remove, + .id_table = smsc_i2c_id, +}; + +module_i2c_driver(smsc_i2c_driver); + +MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); +MODULE_DESCRIPTION("SMSC chip multi-function driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/smsc.h b/include/linux/mfd/smsc.h new file mode 100644 index 0000000..9747b29 --- /dev/null +++ b/include/linux/mfd/smsc.h @@ -0,0 +1,109 @@ +/* + * SMSC ECE1099 + * + * Copyright 2012 Texas Instruments Inc. + * + * Author: Sourav Poddar <sourav.poddar@ti.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#ifndef __LINUX_MFD_SMSC_H +#define __LINUX_MFD_SMSC_H + +#include <linux/regmap.h> + +#define SMSC_ID_ECE1099 1 +#define SMSC_NUM_CLIENTS 2 + +#define SMSC_BASE_ADDR 0x38 +#define OMAP_GPIO_SMSC_IRQ 151 + +#define SMSC_MAXGPIO 32 +#define SMSC_BANK(offs) ((offs) >> 3) +#define SMSC_BIT(offs) (1u << ((offs) & 0x7)) + +struct smsc { + struct device *dev; + struct i2c_client *i2c_clients[SMSC_NUM_CLIENTS]; + struct regmap *regmap; + int clk; + /* Stored chip id */ + int id; +}; + +struct smsc_gpio; +struct smsc_keypad; + +static inline int smsc_read(struct device *child, unsigned int reg, + unsigned int *dest) +{ + struct smsc *smsc = dev_get_drvdata(child->parent); + + return regmap_read(smsc->regmap, reg, dest); +} + +static inline int smsc_write(struct device *child, unsigned int reg, + unsigned int value) +{ + struct smsc *smsc = dev_get_drvdata(child->parent); + + return regmap_write(smsc->regmap, reg, value); +} + +/* Registers for SMSC */ +#define SMSC_RESET 0xF5 +#define SMSC_GRP_INT 0xF9 +#define SMSC_CLK_CTRL 0xFA +#define SMSC_WKUP_CTRL 0xFB +#define SMSC_DEV_ID 0xFC +#define SMSC_DEV_REV 0xFD +#define SMSC_VEN_ID_L 0xFE +#define SMSC_VEN_ID_H 0xFF + +/* CLK VALUE */ +#define SMSC_CLK_VALUE 0x13 + +/* Registers for function GPIO INPUT */ +#define SMSC_GPIO_DATA_IN_START 0x00 + +/* Registers for function GPIO OUPUT */ +#define SMSC_GPIO_DATA_OUT_START 0x05 + +/* Definitions for SMSC GPIO CONFIGURATION REGISTER*/ +#define SMSC_GPIO_INPUT_LOW 0x01 +#define SMSC_GPIO_INPUT_RISING 0x09 +#define SMSC_GPIO_INPUT_FALLING 0x11 +#define SMSC_GPIO_INPUT_BOTH_EDGE 0x19 +#define SMSC_GPIO_OUTPUT_PP 0x21 +#define SMSC_GPIO_OUTPUT_OP 0x31 + +#define GRP_INT_STAT 0xf9 +#define SMSC_GPI_INT 0x0f +#define SMSC_CFG_START 0x0A + +/* Registers for SMSC GPIO INTERRUPT STATUS REGISTER*/ +#define SMSC_GPIO_INT_STAT_START 0x32 + +/* Registers for SMSC GPIO INTERRUPT MASK REGISTER*/ +#define SMSC_GPIO_INT_MASK_START 0x37 + +/* Registers for SMSC function KEYPAD*/ +#define SMSC_KP_OUT 0x40 +#define SMSC_KP_IN 0x41 +#define SMSC_KP_INT_STAT 0x42 +#define SMSC_KP_INT_MASK 0x43 + +/* Definitions for keypad */ +#define SMSC_KP_KSO 0x70 +#define SMSC_KP_KSI 0x51 +#define SMSC_KSO_ALL_LOW 0x20 +#define SMSC_KP_SET_LOW_PWR 0x0B +#define SMSC_KP_SET_HIGH 0xFF +#define SMSC_KSO_EVAL 0x00 + +#endif /* __LINUX_MFD_SMSC_H */
smsc ece1099 is a keyboard scan or gpio expansion device. The patch create keypad and gpio expander child for this multi function smsc driver. Tested on omap5430 evm with 3.6-rc6 custom kernel. Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Benoit Cousson <b-cousson@ti.com> Cc: Felipe Balbi <balbi@ti.com> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> --- Changes since v2: - Change the cache type, max register assignment - remove of_device_table, since i2c based device gets probed according to i2c_device_id through dt. - Modify the remove function - Minor return patch cleanups. Documentation/smsc_ece1099.txt | 56 ++++++++++++++++++++ drivers/mfd/Kconfig | 12 ++++ drivers/mfd/Makefile | 1 + drivers/mfd/smsc-ece1099.c | 113 ++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/smsc.h | 109 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 291 insertions(+), 0 deletions(-) create mode 100644 Documentation/smsc_ece1099.txt create mode 100644 drivers/mfd/smsc-ece1099.c create mode 100644 include/linux/mfd/smsc.h