Message ID | 1396636850-2765-1-git-send-email-dev@kicherer.org (mailing list archive) |
---|---|
State | Accepted |
Commit | b47a22290d581277be70e8a597824a4985d39e83 |
Headers | show |
Hi Mario, On 04/04/2014 08:40 PM, Mario Kicherer wrote: > This patch adds initial support for the Behringer BCD2000 USB DJ controller. > At the moment, only the MIDI part of the device is working, i.e. knobs, > buttons and LEDs. > > I also plan to add support for the audio part, but I assume that this will > require more effort than the rather simple MIDI interface. Progress can be > tracked at https://github.com/anyc/snd-usb-bcd2000. > > Signed-off-by: Mario Kicherer <dev@kicherer.org> FWIW, this looks good to me now. Clemens, Takashi, any further comments from your side? Thanks, Daniel > --- > > Changes since v8: > - module_usb_driver() macro for module initialization > - improved some comments > > Changes since v7: > - replaced snd_card_create with snd_card_new > > Changes since v6: > - applied more style improvements > > Changes since v5: > - use kernel bitmap functions for devices_used > > Changes since v4: > - devices_used as array to support arbitrary number of SNDRV_CARDS > - removed unused array "enable" > > Changes since v3: > - applied style and snd_printk changes as suggested by Daniel Mack > > Changes since v2: > - applied more changes from Daniel Mack and Clemens Ladisch > > Changes since v1: > - fixed the various code style issues, thanks to Daniel Mack and > checkpatch.pl. > > sound/usb/Kconfig | 13 ++ > sound/usb/Makefile | 2 +- > sound/usb/bcd2000/Makefile | 3 + > sound/usb/bcd2000/bcd2000.c | 461 ++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 478 insertions(+), 1 deletion(-) > create mode 100644 sound/usb/bcd2000/Makefile > create mode 100644 sound/usb/bcd2000/bcd2000.c > > diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig > index e05a86b..d393153 100644 > --- a/sound/usb/Kconfig > +++ b/sound/usb/Kconfig > @@ -147,5 +147,18 @@ config SND_USB_HIFACE > To compile this driver as a module, choose M here: the module > will be called snd-usb-hiface. > > +config SND_BCD2000 > + tristate "Behringer BCD2000 MIDI driver" > + select SND_RAWMIDI > + help > + Say Y here to include MIDI support for the Behringer BCD2000 DJ > + controller. > + > + Audio support is still work-in-progress at > + https://github.com/anyc/snd-usb-bcd2000 > + > + To compile this driver as a module, choose M here: the module > + will be called snd-bcd2000. > + > endif # SND_USB > > diff --git a/sound/usb/Makefile b/sound/usb/Makefile > index abe668f..2b92f0d 100644 > --- a/sound/usb/Makefile > +++ b/sound/usb/Makefile > @@ -23,4 +23,4 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o > obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o > obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o > > -obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ > +obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ > diff --git a/sound/usb/bcd2000/Makefile b/sound/usb/bcd2000/Makefile > new file mode 100644 > index 0000000..f09ccc0 > --- /dev/null > +++ b/sound/usb/bcd2000/Makefile > @@ -0,0 +1,3 @@ > +snd-bcd2000-y := bcd2000.o > + > +obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o > \ No newline at end of file > diff --git a/sound/usb/bcd2000/bcd2000.c b/sound/usb/bcd2000/bcd2000.c > new file mode 100644 > index 0000000..820d6ca > --- /dev/null > +++ b/sound/usb/bcd2000/bcd2000.c > @@ -0,0 +1,461 @@ > +/* > + * Behringer BCD2000 driver > + * > + * Copyright (C) 2014 Mario Kicherer (dev@kicherer.org) > + * > + * 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. > + * > + * 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. > + */ > + > +#include <linux/kernel.h> > +#include <linux/errno.h> > +#include <linux/init.h> > +#include <linux/slab.h> > +#include <linux/module.h> > +#include <linux/bitmap.h> > +#include <linux/usb.h> > +#include <linux/usb/audio.h> > +#include <sound/core.h> > +#include <sound/initval.h> > +#include <sound/rawmidi.h> > + > +#define PREFIX "snd-bcd2000: " > +#define BUFSIZE 64 > + > +static struct usb_device_id id_table[] = { > + { USB_DEVICE(0x1397, 0x00bd) }, > + { }, > +}; > + > +static unsigned char device_cmd_prefix[] = {0x03, 0x00}; > + > +static unsigned char bcd2000_init_sequence[] = { > + 0x07, 0x00, 0x00, 0x00, 0x78, 0x48, 0x1c, 0x81, > + 0xc4, 0x00, 0x00, 0x00, 0x5e, 0x53, 0x4a, 0xf7, > + 0x18, 0xfa, 0x11, 0xff, 0x6c, 0xf3, 0x90, 0xff, > + 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, > + 0x18, 0xfa, 0x11, 0xff, 0x14, 0x00, 0x00, 0x00, > + 0x00, 0x00, 0x00, 0x00, 0xf2, 0x34, 0x4a, 0xf7, > + 0x18, 0xfa, 0x11, 0xff > +}; > + > +struct bcd2000 { > + struct usb_device *dev; > + struct snd_card *card; > + struct usb_interface *intf; > + int card_index; > + > + int midi_out_active; > + struct snd_rawmidi *rmidi; > + struct snd_rawmidi_substream *midi_receive_substream; > + struct snd_rawmidi_substream *midi_out_substream; > + > + unsigned char midi_in_buf[BUFSIZE]; > + unsigned char midi_out_buf[BUFSIZE]; > + > + struct urb *midi_out_urb; > + struct urb *midi_in_urb; > + > + struct usb_anchor anchor; > +}; > + > +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; > +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; > + > +static DEFINE_MUTEX(devices_mutex); > +DECLARE_BITMAP(devices_used, SNDRV_CARDS); > +static struct usb_driver bcd2000_driver; > + > +#ifdef CONFIG_SND_DEBUG > +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) > +{ > + print_hex_dump(KERN_DEBUG, prefix, > + DUMP_PREFIX_NONE, 16, 1, > + buf, len, false); > +} > +#else > +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) {} > +#endif > + > +static int bcd2000_midi_input_open(struct snd_rawmidi_substream *substream) > +{ > + return 0; > +} > + > +static int bcd2000_midi_input_close(struct snd_rawmidi_substream *substream) > +{ > + return 0; > +} > + > +/* (de)register midi substream from client */ > +static void bcd2000_midi_input_trigger(struct snd_rawmidi_substream *substream, > + int up) > +{ > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > + bcd2k->midi_receive_substream = up ? substream : NULL; > +} > + > +static void bcd2000_midi_handle_input(struct bcd2000 *bcd2k, > + const unsigned char *buf, unsigned int buf_len) > +{ > + unsigned int payload_length, tocopy; > + struct snd_rawmidi_substream *midi_receive_substream; > + > + midi_receive_substream = ACCESS_ONCE(bcd2k->midi_receive_substream); > + if (!midi_receive_substream) > + return; > + > + bcd2000_dump_buffer(PREFIX "received from device: ", buf, buf_len); > + > + if (buf_len < 2) > + return; > + > + payload_length = buf[0]; > + > + /* ignore packets without payload */ > + if (payload_length == 0) > + return; > + > + tocopy = min(payload_length, buf_len-1); > + > + bcd2000_dump_buffer(PREFIX "sending to userspace: ", > + &buf[1], tocopy); > + > + snd_rawmidi_receive(midi_receive_substream, > + &buf[1], tocopy); > +} > + > +static void bcd2000_midi_send(struct bcd2000 *bcd2k) > +{ > + int len, ret; > + struct snd_rawmidi_substream *midi_out_substream; > + > + BUILD_BUG_ON(sizeof(device_cmd_prefix) >= BUFSIZE); > + > + midi_out_substream = ACCESS_ONCE(bcd2k->midi_out_substream); > + if (!midi_out_substream) > + return; > + > + /* copy command prefix bytes */ > + memcpy(bcd2k->midi_out_buf, device_cmd_prefix, > + sizeof(device_cmd_prefix)); > + > + /* > + * get MIDI packet and leave space for command prefix > + * and payload length > + */ > + len = snd_rawmidi_transmit(midi_out_substream, > + bcd2k->midi_out_buf + 3, BUFSIZE - 3); > + > + if (len < 0) > + dev_err(&bcd2k->dev->dev, "%s: snd_rawmidi_transmit error %d\n", > + __func__, len); > + > + if (len <= 0) > + return; > + > + /* set payload length */ > + bcd2k->midi_out_buf[2] = len; > + bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; > + > + bcd2000_dump_buffer(PREFIX "sending to device: ", > + bcd2k->midi_out_buf, len+3); > + > + /* send packet to the BCD2000 */ > + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s (%p): usb_submit_urb() failed, ret=%d, len=%d\n", > + __func__, midi_out_substream, ret, len); > + else > + bcd2k->midi_out_active = 1; > +} > + > +static int bcd2000_midi_output_open(struct snd_rawmidi_substream *substream) > +{ > + return 0; > +} > + > +static int bcd2000_midi_output_close(struct snd_rawmidi_substream *substream) > +{ > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > + > + if (bcd2k->midi_out_active) { > + usb_kill_urb(bcd2k->midi_out_urb); > + bcd2k->midi_out_active = 0; > + } > + > + return 0; > +} > + > +/* (de)register midi substream from client */ > +static void bcd2000_midi_output_trigger(struct snd_rawmidi_substream *substream, > + int up) > +{ > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > + > + if (up) { > + bcd2k->midi_out_substream = substream; > + /* check if there is data userspace wants to send */ > + if (!bcd2k->midi_out_active) > + bcd2000_midi_send(bcd2k); > + } else { > + bcd2k->midi_out_substream = NULL; > + } > +} > + > +static void bcd2000_output_complete(struct urb *urb) > +{ > + struct bcd2000 *bcd2k = urb->context; > + > + bcd2k->midi_out_active = 0; > + > + if (urb->status) > + dev_warn(&urb->dev->dev, > + PREFIX "output urb->status: %d\n", urb->status); > + > + if (urb->status == -ESHUTDOWN) > + return; > + > + /* check if there is more data userspace wants to send */ > + bcd2000_midi_send(bcd2k); > +} > + > +static void bcd2000_input_complete(struct urb *urb) > +{ > + int ret; > + struct bcd2000 *bcd2k = urb->context; > + > + if (urb->status) > + dev_warn(&urb->dev->dev, > + PREFIX "input urb->status: %i\n", urb->status); > + > + if (!bcd2k || urb->status == -ESHUTDOWN) > + return; > + > + if (urb->actual_length > 0) > + bcd2000_midi_handle_input(bcd2k, urb->transfer_buffer, > + urb->actual_length); > + > + /* return URB to device */ > + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s: usb_submit_urb() failed, ret=%d\n", > + __func__, ret); > +} > + > +static struct snd_rawmidi_ops bcd2000_midi_output = { > + .open = bcd2000_midi_output_open, > + .close = bcd2000_midi_output_close, > + .trigger = bcd2000_midi_output_trigger, > +}; > + > +static struct snd_rawmidi_ops bcd2000_midi_input = { > + .open = bcd2000_midi_input_open, > + .close = bcd2000_midi_input_close, > + .trigger = bcd2000_midi_input_trigger, > +}; > + > +static void bcd2000_init_device(struct bcd2000 *bcd2k) > +{ > + int ret; > + > + init_usb_anchor(&bcd2k->anchor); > + usb_anchor_urb(bcd2k->midi_out_urb, &bcd2k->anchor); > + usb_anchor_urb(bcd2k->midi_in_urb, &bcd2k->anchor); > + > + /* copy init sequence into buffer */ > + memcpy(bcd2k->midi_out_buf, bcd2000_init_sequence, 52); > + bcd2k->midi_out_urb->transfer_buffer_length = 52; > + > + /* submit sequence */ > + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_KERNEL); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s: usb_submit_urb() out failed, ret=%d: ", > + __func__, ret); > + else > + bcd2k->midi_out_active = 1; > + > + /* pass URB to device to enable button and controller events */ > + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_KERNEL); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s: usb_submit_urb() in failed, ret=%d: ", > + __func__, ret); > + > + /* ensure initialization is finished */ > + usb_wait_anchor_empty_timeout(&bcd2k->anchor, 1000); > +} > + > +static int bcd2000_init_midi(struct bcd2000 *bcd2k) > +{ > + int ret; > + struct snd_rawmidi *rmidi; > + > + ret = snd_rawmidi_new(bcd2k->card, bcd2k->card->shortname, 0, > + 1, /* output */ > + 1, /* input */ > + &rmidi); > + > + if (ret < 0) > + return ret; > + > + strlcpy(rmidi->name, bcd2k->card->shortname, sizeof(rmidi->name)); > + > + rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX; > + rmidi->private_data = bcd2k; > + > + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; > + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, > + &bcd2000_midi_output); > + > + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; > + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, > + &bcd2000_midi_input); > + > + bcd2k->rmidi = rmidi; > + > + bcd2k->midi_in_urb = usb_alloc_urb(0, GFP_KERNEL); > + bcd2k->midi_out_urb = usb_alloc_urb(0, GFP_KERNEL); > + > + if (!bcd2k->midi_in_urb || !bcd2k->midi_out_urb) { > + dev_err(&bcd2k->dev->dev, PREFIX "usb_alloc_urb failed\n"); > + return -ENOMEM; > + } > + > + usb_fill_int_urb(bcd2k->midi_in_urb, bcd2k->dev, > + usb_rcvintpipe(bcd2k->dev, 0x81), > + bcd2k->midi_in_buf, BUFSIZE, > + bcd2000_input_complete, bcd2k, 1); > + > + usb_fill_int_urb(bcd2k->midi_out_urb, bcd2k->dev, > + usb_sndintpipe(bcd2k->dev, 0x1), > + bcd2k->midi_out_buf, BUFSIZE, > + bcd2000_output_complete, bcd2k, 1); > + > + bcd2000_init_device(bcd2k); > + > + return 0; > +} > + > +static void bcd2000_free_usb_related_resources(struct bcd2000 *bcd2k, > + struct usb_interface *interface) > +{ > + /* usb_kill_urb not necessary, urb is aborted automatically */ > + > + usb_free_urb(bcd2k->midi_out_urb); > + usb_free_urb(bcd2k->midi_in_urb); > + > + if (bcd2k->intf) { > + usb_set_intfdata(bcd2k->intf, NULL); > + bcd2k->intf = NULL; > + } > +} > + > +static int bcd2000_probe(struct usb_interface *interface, > + const struct usb_device_id *usb_id) > +{ > + struct snd_card *card; > + struct bcd2000 *bcd2k; > + unsigned int card_index; > + char usb_path[32]; > + int err; > + > + mutex_lock(&devices_mutex); > + > + for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) > + if (!test_bit(card_index, devices_used)) > + break; > + > + if (card_index >= SNDRV_CARDS) { > + mutex_unlock(&devices_mutex); > + return -ENOENT; > + } > + > + err = snd_card_new(&interface->dev, index[card_index], id[card_index], > + THIS_MODULE, sizeof(*bcd2k), &card); > + if (err < 0) { > + mutex_unlock(&devices_mutex); > + return err; > + } > + > + bcd2k = card->private_data; > + bcd2k->dev = interface_to_usbdev(interface); > + bcd2k->card = card; > + bcd2k->card_index = card_index; > + bcd2k->intf = interface; > + > + snd_card_set_dev(card, &interface->dev); > + > + strncpy(card->driver, "snd-bcd2000", sizeof(card->driver)); > + strncpy(card->shortname, "BCD2000", sizeof(card->shortname)); > + usb_make_path(bcd2k->dev, usb_path, sizeof(usb_path)); > + snprintf(bcd2k->card->longname, sizeof(bcd2k->card->longname), > + "Behringer BCD2000 at %s", > + usb_path); > + > + err = bcd2000_init_midi(bcd2k); > + if (err < 0) > + goto probe_error; > + > + err = snd_card_register(card); > + if (err < 0) > + goto probe_error; > + > + usb_set_intfdata(interface, bcd2k); > + set_bit(card_index, devices_used); > + > + mutex_unlock(&devices_mutex); > + return 0; > + > +probe_error: > + dev_info(&bcd2k->dev->dev, PREFIX "error during probing"); > + bcd2000_free_usb_related_resources(bcd2k, interface); > + snd_card_free(card); > + mutex_unlock(&devices_mutex); > + return err; > +} > + > +static void bcd2000_disconnect(struct usb_interface *interface) > +{ > + struct bcd2000 *bcd2k = usb_get_intfdata(interface); > + > + if (!bcd2k) > + return; > + > + mutex_lock(&devices_mutex); > + > + /* make sure that userspace cannot create new requests */ > + snd_card_disconnect(bcd2k->card); > + > + bcd2000_free_usb_related_resources(bcd2k, interface); > + > + clear_bit(bcd2k->card_index, devices_used); > + > + snd_card_free_when_closed(bcd2k->card); > + > + mutex_unlock(&devices_mutex); > +} > + > +static struct usb_driver bcd2000_driver = { > + .name = "snd-bcd2000", > + .probe = bcd2000_probe, > + .disconnect = bcd2000_disconnect, > + .id_table = id_table, > +}; > + > +module_usb_driver(bcd2000_driver); > + > +MODULE_DEVICE_TABLE(usb, id_table); > +MODULE_AUTHOR("Mario Kicherer, dev@kicherer.org"); > +MODULE_DESCRIPTION("Behringer BCD2000 driver"); > +MODULE_LICENSE("GPL"); >
At Mon, 07 Apr 2014 15:44:21 +0200, Daniel Mack wrote: > > Hi Mario, > > On 04/04/2014 08:40 PM, Mario Kicherer wrote: > > This patch adds initial support for the Behringer BCD2000 USB DJ controller. > > At the moment, only the MIDI part of the device is working, i.e. knobs, > > buttons and LEDs. > > > > I also plan to add support for the audio part, but I assume that this will > > require more effort than the rather simple MIDI interface. Progress can be > > tracked at https://github.com/anyc/snd-usb-bcd2000. > > > > Signed-off-by: Mario Kicherer <dev@kicherer.org> > > FWIW, this looks good to me now. Clemens, Takashi, any further comments > from your side? Could you give your ack if the review is OK? Then I'm going to merge the patch (but for post 3.15). thanks, Takashi > Thanks, > Daniel > > > --- > > > > Changes since v8: > > - module_usb_driver() macro for module initialization > > - improved some comments > > > > Changes since v7: > > - replaced snd_card_create with snd_card_new > > > > Changes since v6: > > - applied more style improvements > > > > Changes since v5: > > - use kernel bitmap functions for devices_used > > > > Changes since v4: > > - devices_used as array to support arbitrary number of SNDRV_CARDS > > - removed unused array "enable" > > > > Changes since v3: > > - applied style and snd_printk changes as suggested by Daniel Mack > > > > Changes since v2: > > - applied more changes from Daniel Mack and Clemens Ladisch > > > > Changes since v1: > > - fixed the various code style issues, thanks to Daniel Mack and > > checkpatch.pl. > > > > sound/usb/Kconfig | 13 ++ > > sound/usb/Makefile | 2 +- > > sound/usb/bcd2000/Makefile | 3 + > > sound/usb/bcd2000/bcd2000.c | 461 ++++++++++++++++++++++++++++++++++++++++++++ > > 4 files changed, 478 insertions(+), 1 deletion(-) > > create mode 100644 sound/usb/bcd2000/Makefile > > create mode 100644 sound/usb/bcd2000/bcd2000.c > > > > diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig > > index e05a86b..d393153 100644 > > --- a/sound/usb/Kconfig > > +++ b/sound/usb/Kconfig > > @@ -147,5 +147,18 @@ config SND_USB_HIFACE > > To compile this driver as a module, choose M here: the module > > will be called snd-usb-hiface. > > > > +config SND_BCD2000 > > + tristate "Behringer BCD2000 MIDI driver" > > + select SND_RAWMIDI > > + help > > + Say Y here to include MIDI support for the Behringer BCD2000 DJ > > + controller. > > + > > + Audio support is still work-in-progress at > > + https://github.com/anyc/snd-usb-bcd2000 > > + > > + To compile this driver as a module, choose M here: the module > > + will be called snd-bcd2000. > > + > > endif # SND_USB > > > > diff --git a/sound/usb/Makefile b/sound/usb/Makefile > > index abe668f..2b92f0d 100644 > > --- a/sound/usb/Makefile > > +++ b/sound/usb/Makefile > > @@ -23,4 +23,4 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o > > obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o > > obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o > > > > -obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ > > +obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ > > diff --git a/sound/usb/bcd2000/Makefile b/sound/usb/bcd2000/Makefile > > new file mode 100644 > > index 0000000..f09ccc0 > > --- /dev/null > > +++ b/sound/usb/bcd2000/Makefile > > @@ -0,0 +1,3 @@ > > +snd-bcd2000-y := bcd2000.o > > + > > +obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o > > \ No newline at end of file > > diff --git a/sound/usb/bcd2000/bcd2000.c b/sound/usb/bcd2000/bcd2000.c > > new file mode 100644 > > index 0000000..820d6ca > > --- /dev/null > > +++ b/sound/usb/bcd2000/bcd2000.c > > @@ -0,0 +1,461 @@ > > +/* > > + * Behringer BCD2000 driver > > + * > > + * Copyright (C) 2014 Mario Kicherer (dev@kicherer.org) > > + * > > + * 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. > > + * > > + * 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. > > + */ > > + > > +#include <linux/kernel.h> > > +#include <linux/errno.h> > > +#include <linux/init.h> > > +#include <linux/slab.h> > > +#include <linux/module.h> > > +#include <linux/bitmap.h> > > +#include <linux/usb.h> > > +#include <linux/usb/audio.h> > > +#include <sound/core.h> > > +#include <sound/initval.h> > > +#include <sound/rawmidi.h> > > + > > +#define PREFIX "snd-bcd2000: " > > +#define BUFSIZE 64 > > + > > +static struct usb_device_id id_table[] = { > > + { USB_DEVICE(0x1397, 0x00bd) }, > > + { }, > > +}; > > + > > +static unsigned char device_cmd_prefix[] = {0x03, 0x00}; > > + > > +static unsigned char bcd2000_init_sequence[] = { > > + 0x07, 0x00, 0x00, 0x00, 0x78, 0x48, 0x1c, 0x81, > > + 0xc4, 0x00, 0x00, 0x00, 0x5e, 0x53, 0x4a, 0xf7, > > + 0x18, 0xfa, 0x11, 0xff, 0x6c, 0xf3, 0x90, 0xff, > > + 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, > > + 0x18, 0xfa, 0x11, 0xff, 0x14, 0x00, 0x00, 0x00, > > + 0x00, 0x00, 0x00, 0x00, 0xf2, 0x34, 0x4a, 0xf7, > > + 0x18, 0xfa, 0x11, 0xff > > +}; > > + > > +struct bcd2000 { > > + struct usb_device *dev; > > + struct snd_card *card; > > + struct usb_interface *intf; > > + int card_index; > > + > > + int midi_out_active; > > + struct snd_rawmidi *rmidi; > > + struct snd_rawmidi_substream *midi_receive_substream; > > + struct snd_rawmidi_substream *midi_out_substream; > > + > > + unsigned char midi_in_buf[BUFSIZE]; > > + unsigned char midi_out_buf[BUFSIZE]; > > + > > + struct urb *midi_out_urb; > > + struct urb *midi_in_urb; > > + > > + struct usb_anchor anchor; > > +}; > > + > > +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; > > +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; > > + > > +static DEFINE_MUTEX(devices_mutex); > > +DECLARE_BITMAP(devices_used, SNDRV_CARDS); > > +static struct usb_driver bcd2000_driver; > > + > > +#ifdef CONFIG_SND_DEBUG > > +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) > > +{ > > + print_hex_dump(KERN_DEBUG, prefix, > > + DUMP_PREFIX_NONE, 16, 1, > > + buf, len, false); > > +} > > +#else > > +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) {} > > +#endif > > + > > +static int bcd2000_midi_input_open(struct snd_rawmidi_substream *substream) > > +{ > > + return 0; > > +} > > + > > +static int bcd2000_midi_input_close(struct snd_rawmidi_substream *substream) > > +{ > > + return 0; > > +} > > + > > +/* (de)register midi substream from client */ > > +static void bcd2000_midi_input_trigger(struct snd_rawmidi_substream *substream, > > + int up) > > +{ > > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > > + bcd2k->midi_receive_substream = up ? substream : NULL; > > +} > > + > > +static void bcd2000_midi_handle_input(struct bcd2000 *bcd2k, > > + const unsigned char *buf, unsigned int buf_len) > > +{ > > + unsigned int payload_length, tocopy; > > + struct snd_rawmidi_substream *midi_receive_substream; > > + > > + midi_receive_substream = ACCESS_ONCE(bcd2k->midi_receive_substream); > > + if (!midi_receive_substream) > > + return; > > + > > + bcd2000_dump_buffer(PREFIX "received from device: ", buf, buf_len); > > + > > + if (buf_len < 2) > > + return; > > + > > + payload_length = buf[0]; > > + > > + /* ignore packets without payload */ > > + if (payload_length == 0) > > + return; > > + > > + tocopy = min(payload_length, buf_len-1); > > + > > + bcd2000_dump_buffer(PREFIX "sending to userspace: ", > > + &buf[1], tocopy); > > + > > + snd_rawmidi_receive(midi_receive_substream, > > + &buf[1], tocopy); > > +} > > + > > +static void bcd2000_midi_send(struct bcd2000 *bcd2k) > > +{ > > + int len, ret; > > + struct snd_rawmidi_substream *midi_out_substream; > > + > > + BUILD_BUG_ON(sizeof(device_cmd_prefix) >= BUFSIZE); > > + > > + midi_out_substream = ACCESS_ONCE(bcd2k->midi_out_substream); > > + if (!midi_out_substream) > > + return; > > + > > + /* copy command prefix bytes */ > > + memcpy(bcd2k->midi_out_buf, device_cmd_prefix, > > + sizeof(device_cmd_prefix)); > > + > > + /* > > + * get MIDI packet and leave space for command prefix > > + * and payload length > > + */ > > + len = snd_rawmidi_transmit(midi_out_substream, > > + bcd2k->midi_out_buf + 3, BUFSIZE - 3); > > + > > + if (len < 0) > > + dev_err(&bcd2k->dev->dev, "%s: snd_rawmidi_transmit error %d\n", > > + __func__, len); > > + > > + if (len <= 0) > > + return; > > + > > + /* set payload length */ > > + bcd2k->midi_out_buf[2] = len; > > + bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; > > + > > + bcd2000_dump_buffer(PREFIX "sending to device: ", > > + bcd2k->midi_out_buf, len+3); > > + > > + /* send packet to the BCD2000 */ > > + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); > > + if (ret < 0) > > + dev_err(&bcd2k->dev->dev, PREFIX > > + "%s (%p): usb_submit_urb() failed, ret=%d, len=%d\n", > > + __func__, midi_out_substream, ret, len); > > + else > > + bcd2k->midi_out_active = 1; > > +} > > + > > +static int bcd2000_midi_output_open(struct snd_rawmidi_substream *substream) > > +{ > > + return 0; > > +} > > + > > +static int bcd2000_midi_output_close(struct snd_rawmidi_substream *substream) > > +{ > > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > > + > > + if (bcd2k->midi_out_active) { > > + usb_kill_urb(bcd2k->midi_out_urb); > > + bcd2k->midi_out_active = 0; > > + } > > + > > + return 0; > > +} > > + > > +/* (de)register midi substream from client */ > > +static void bcd2000_midi_output_trigger(struct snd_rawmidi_substream *substream, > > + int up) > > +{ > > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > > + > > + if (up) { > > + bcd2k->midi_out_substream = substream; > > + /* check if there is data userspace wants to send */ > > + if (!bcd2k->midi_out_active) > > + bcd2000_midi_send(bcd2k); > > + } else { > > + bcd2k->midi_out_substream = NULL; > > + } > > +} > > + > > +static void bcd2000_output_complete(struct urb *urb) > > +{ > > + struct bcd2000 *bcd2k = urb->context; > > + > > + bcd2k->midi_out_active = 0; > > + > > + if (urb->status) > > + dev_warn(&urb->dev->dev, > > + PREFIX "output urb->status: %d\n", urb->status); > > + > > + if (urb->status == -ESHUTDOWN) > > + return; > > + > > + /* check if there is more data userspace wants to send */ > > + bcd2000_midi_send(bcd2k); > > +} > > + > > +static void bcd2000_input_complete(struct urb *urb) > > +{ > > + int ret; > > + struct bcd2000 *bcd2k = urb->context; > > + > > + if (urb->status) > > + dev_warn(&urb->dev->dev, > > + PREFIX "input urb->status: %i\n", urb->status); > > + > > + if (!bcd2k || urb->status == -ESHUTDOWN) > > + return; > > + > > + if (urb->actual_length > 0) > > + bcd2000_midi_handle_input(bcd2k, urb->transfer_buffer, > > + urb->actual_length); > > + > > + /* return URB to device */ > > + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC); > > + if (ret < 0) > > + dev_err(&bcd2k->dev->dev, PREFIX > > + "%s: usb_submit_urb() failed, ret=%d\n", > > + __func__, ret); > > +} > > + > > +static struct snd_rawmidi_ops bcd2000_midi_output = { > > + .open = bcd2000_midi_output_open, > > + .close = bcd2000_midi_output_close, > > + .trigger = bcd2000_midi_output_trigger, > > +}; > > + > > +static struct snd_rawmidi_ops bcd2000_midi_input = { > > + .open = bcd2000_midi_input_open, > > + .close = bcd2000_midi_input_close, > > + .trigger = bcd2000_midi_input_trigger, > > +}; > > + > > +static void bcd2000_init_device(struct bcd2000 *bcd2k) > > +{ > > + int ret; > > + > > + init_usb_anchor(&bcd2k->anchor); > > + usb_anchor_urb(bcd2k->midi_out_urb, &bcd2k->anchor); > > + usb_anchor_urb(bcd2k->midi_in_urb, &bcd2k->anchor); > > + > > + /* copy init sequence into buffer */ > > + memcpy(bcd2k->midi_out_buf, bcd2000_init_sequence, 52); > > + bcd2k->midi_out_urb->transfer_buffer_length = 52; > > + > > + /* submit sequence */ > > + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_KERNEL); > > + if (ret < 0) > > + dev_err(&bcd2k->dev->dev, PREFIX > > + "%s: usb_submit_urb() out failed, ret=%d: ", > > + __func__, ret); > > + else > > + bcd2k->midi_out_active = 1; > > + > > + /* pass URB to device to enable button and controller events */ > > + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_KERNEL); > > + if (ret < 0) > > + dev_err(&bcd2k->dev->dev, PREFIX > > + "%s: usb_submit_urb() in failed, ret=%d: ", > > + __func__, ret); > > + > > + /* ensure initialization is finished */ > > + usb_wait_anchor_empty_timeout(&bcd2k->anchor, 1000); > > +} > > + > > +static int bcd2000_init_midi(struct bcd2000 *bcd2k) > > +{ > > + int ret; > > + struct snd_rawmidi *rmidi; > > + > > + ret = snd_rawmidi_new(bcd2k->card, bcd2k->card->shortname, 0, > > + 1, /* output */ > > + 1, /* input */ > > + &rmidi); > > + > > + if (ret < 0) > > + return ret; > > + > > + strlcpy(rmidi->name, bcd2k->card->shortname, sizeof(rmidi->name)); > > + > > + rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX; > > + rmidi->private_data = bcd2k; > > + > > + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; > > + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, > > + &bcd2000_midi_output); > > + > > + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; > > + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, > > + &bcd2000_midi_input); > > + > > + bcd2k->rmidi = rmidi; > > + > > + bcd2k->midi_in_urb = usb_alloc_urb(0, GFP_KERNEL); > > + bcd2k->midi_out_urb = usb_alloc_urb(0, GFP_KERNEL); > > + > > + if (!bcd2k->midi_in_urb || !bcd2k->midi_out_urb) { > > + dev_err(&bcd2k->dev->dev, PREFIX "usb_alloc_urb failed\n"); > > + return -ENOMEM; > > + } > > + > > + usb_fill_int_urb(bcd2k->midi_in_urb, bcd2k->dev, > > + usb_rcvintpipe(bcd2k->dev, 0x81), > > + bcd2k->midi_in_buf, BUFSIZE, > > + bcd2000_input_complete, bcd2k, 1); > > + > > + usb_fill_int_urb(bcd2k->midi_out_urb, bcd2k->dev, > > + usb_sndintpipe(bcd2k->dev, 0x1), > > + bcd2k->midi_out_buf, BUFSIZE, > > + bcd2000_output_complete, bcd2k, 1); > > + > > + bcd2000_init_device(bcd2k); > > + > > + return 0; > > +} > > + > > +static void bcd2000_free_usb_related_resources(struct bcd2000 *bcd2k, > > + struct usb_interface *interface) > > +{ > > + /* usb_kill_urb not necessary, urb is aborted automatically */ > > + > > + usb_free_urb(bcd2k->midi_out_urb); > > + usb_free_urb(bcd2k->midi_in_urb); > > + > > + if (bcd2k->intf) { > > + usb_set_intfdata(bcd2k->intf, NULL); > > + bcd2k->intf = NULL; > > + } > > +} > > + > > +static int bcd2000_probe(struct usb_interface *interface, > > + const struct usb_device_id *usb_id) > > +{ > > + struct snd_card *card; > > + struct bcd2000 *bcd2k; > > + unsigned int card_index; > > + char usb_path[32]; > > + int err; > > + > > + mutex_lock(&devices_mutex); > > + > > + for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) > > + if (!test_bit(card_index, devices_used)) > > + break; > > + > > + if (card_index >= SNDRV_CARDS) { > > + mutex_unlock(&devices_mutex); > > + return -ENOENT; > > + } > > + > > + err = snd_card_new(&interface->dev, index[card_index], id[card_index], > > + THIS_MODULE, sizeof(*bcd2k), &card); > > + if (err < 0) { > > + mutex_unlock(&devices_mutex); > > + return err; > > + } > > + > > + bcd2k = card->private_data; > > + bcd2k->dev = interface_to_usbdev(interface); > > + bcd2k->card = card; > > + bcd2k->card_index = card_index; > > + bcd2k->intf = interface; > > + > > + snd_card_set_dev(card, &interface->dev); > > + > > + strncpy(card->driver, "snd-bcd2000", sizeof(card->driver)); > > + strncpy(card->shortname, "BCD2000", sizeof(card->shortname)); > > + usb_make_path(bcd2k->dev, usb_path, sizeof(usb_path)); > > + snprintf(bcd2k->card->longname, sizeof(bcd2k->card->longname), > > + "Behringer BCD2000 at %s", > > + usb_path); > > + > > + err = bcd2000_init_midi(bcd2k); > > + if (err < 0) > > + goto probe_error; > > + > > + err = snd_card_register(card); > > + if (err < 0) > > + goto probe_error; > > + > > + usb_set_intfdata(interface, bcd2k); > > + set_bit(card_index, devices_used); > > + > > + mutex_unlock(&devices_mutex); > > + return 0; > > + > > +probe_error: > > + dev_info(&bcd2k->dev->dev, PREFIX "error during probing"); > > + bcd2000_free_usb_related_resources(bcd2k, interface); > > + snd_card_free(card); > > + mutex_unlock(&devices_mutex); > > + return err; > > +} > > + > > +static void bcd2000_disconnect(struct usb_interface *interface) > > +{ > > + struct bcd2000 *bcd2k = usb_get_intfdata(interface); > > + > > + if (!bcd2k) > > + return; > > + > > + mutex_lock(&devices_mutex); > > + > > + /* make sure that userspace cannot create new requests */ > > + snd_card_disconnect(bcd2k->card); > > + > > + bcd2000_free_usb_related_resources(bcd2k, interface); > > + > > + clear_bit(bcd2k->card_index, devices_used); > > + > > + snd_card_free_when_closed(bcd2k->card); > > + > > + mutex_unlock(&devices_mutex); > > +} > > + > > +static struct usb_driver bcd2000_driver = { > > + .name = "snd-bcd2000", > > + .probe = bcd2000_probe, > > + .disconnect = bcd2000_disconnect, > > + .id_table = id_table, > > +}; > > + > > +module_usb_driver(bcd2000_driver); > > + > > +MODULE_DEVICE_TABLE(usb, id_table); > > +MODULE_AUTHOR("Mario Kicherer, dev@kicherer.org"); > > +MODULE_DESCRIPTION("Behringer BCD2000 driver"); > > +MODULE_LICENSE("GPL"); > > >
On 04/07/2014 03:50 PM, Takashi Iwai wrote: > At Mon, 07 Apr 2014 15:44:21 +0200, > Daniel Mack wrote: >> >> Hi Mario, >> >> On 04/04/2014 08:40 PM, Mario Kicherer wrote: >>> This patch adds initial support for the Behringer BCD2000 USB DJ controller. >>> At the moment, only the MIDI part of the device is working, i.e. knobs, >>> buttons and LEDs. >>> >>> I also plan to add support for the audio part, but I assume that this will >>> require more effort than the rather simple MIDI interface. Progress can be >>> tracked at https://github.com/anyc/snd-usb-bcd2000. >>> >>> Signed-off-by: Mario Kicherer <dev@kicherer.org> >> >> FWIW, this looks good to me now. Clemens, Takashi, any further comments >> from your side? > > Could you give your ack if the review is OK? I think this one is more appropriate: Reviewed-by: Daniel Mack <daniel@zonque.org> > Then I'm going to merge the patch (but for post 3.15). Thanks, Daniel >>> --- >>> >>> Changes since v8: >>> - module_usb_driver() macro for module initialization >>> - improved some comments >>> >>> Changes since v7: >>> - replaced snd_card_create with snd_card_new >>> >>> Changes since v6: >>> - applied more style improvements >>> >>> Changes since v5: >>> - use kernel bitmap functions for devices_used >>> >>> Changes since v4: >>> - devices_used as array to support arbitrary number of SNDRV_CARDS >>> - removed unused array "enable" >>> >>> Changes since v3: >>> - applied style and snd_printk changes as suggested by Daniel Mack >>> >>> Changes since v2: >>> - applied more changes from Daniel Mack and Clemens Ladisch >>> >>> Changes since v1: >>> - fixed the various code style issues, thanks to Daniel Mack and >>> checkpatch.pl. >>> >>> sound/usb/Kconfig | 13 ++ >>> sound/usb/Makefile | 2 +- >>> sound/usb/bcd2000/Makefile | 3 + >>> sound/usb/bcd2000/bcd2000.c | 461 ++++++++++++++++++++++++++++++++++++++++++++ >>> 4 files changed, 478 insertions(+), 1 deletion(-) >>> create mode 100644 sound/usb/bcd2000/Makefile >>> create mode 100644 sound/usb/bcd2000/bcd2000.c >>> >>> diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig >>> index e05a86b..d393153 100644 >>> --- a/sound/usb/Kconfig >>> +++ b/sound/usb/Kconfig >>> @@ -147,5 +147,18 @@ config SND_USB_HIFACE >>> To compile this driver as a module, choose M here: the module >>> will be called snd-usb-hiface. >>> >>> +config SND_BCD2000 >>> + tristate "Behringer BCD2000 MIDI driver" >>> + select SND_RAWMIDI >>> + help >>> + Say Y here to include MIDI support for the Behringer BCD2000 DJ >>> + controller. >>> + >>> + Audio support is still work-in-progress at >>> + https://github.com/anyc/snd-usb-bcd2000 >>> + >>> + To compile this driver as a module, choose M here: the module >>> + will be called snd-bcd2000. >>> + >>> endif # SND_USB >>> >>> diff --git a/sound/usb/Makefile b/sound/usb/Makefile >>> index abe668f..2b92f0d 100644 >>> --- a/sound/usb/Makefile >>> +++ b/sound/usb/Makefile >>> @@ -23,4 +23,4 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o >>> obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o >>> obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o >>> >>> -obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ >>> +obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ >>> diff --git a/sound/usb/bcd2000/Makefile b/sound/usb/bcd2000/Makefile >>> new file mode 100644 >>> index 0000000..f09ccc0 >>> --- /dev/null >>> +++ b/sound/usb/bcd2000/Makefile >>> @@ -0,0 +1,3 @@ >>> +snd-bcd2000-y := bcd2000.o >>> + >>> +obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o >>> \ No newline at end of file >>> diff --git a/sound/usb/bcd2000/bcd2000.c b/sound/usb/bcd2000/bcd2000.c >>> new file mode 100644 >>> index 0000000..820d6ca >>> --- /dev/null >>> +++ b/sound/usb/bcd2000/bcd2000.c >>> @@ -0,0 +1,461 @@ >>> +/* >>> + * Behringer BCD2000 driver >>> + * >>> + * Copyright (C) 2014 Mario Kicherer (dev@kicherer.org) >>> + * >>> + * 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. >>> + * >>> + * 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. >>> + */ >>> + >>> +#include <linux/kernel.h> >>> +#include <linux/errno.h> >>> +#include <linux/init.h> >>> +#include <linux/slab.h> >>> +#include <linux/module.h> >>> +#include <linux/bitmap.h> >>> +#include <linux/usb.h> >>> +#include <linux/usb/audio.h> >>> +#include <sound/core.h> >>> +#include <sound/initval.h> >>> +#include <sound/rawmidi.h> >>> + >>> +#define PREFIX "snd-bcd2000: " >>> +#define BUFSIZE 64 >>> + >>> +static struct usb_device_id id_table[] = { >>> + { USB_DEVICE(0x1397, 0x00bd) }, >>> + { }, >>> +}; >>> + >>> +static unsigned char device_cmd_prefix[] = {0x03, 0x00}; >>> + >>> +static unsigned char bcd2000_init_sequence[] = { >>> + 0x07, 0x00, 0x00, 0x00, 0x78, 0x48, 0x1c, 0x81, >>> + 0xc4, 0x00, 0x00, 0x00, 0x5e, 0x53, 0x4a, 0xf7, >>> + 0x18, 0xfa, 0x11, 0xff, 0x6c, 0xf3, 0x90, 0xff, >>> + 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, >>> + 0x18, 0xfa, 0x11, 0xff, 0x14, 0x00, 0x00, 0x00, >>> + 0x00, 0x00, 0x00, 0x00, 0xf2, 0x34, 0x4a, 0xf7, >>> + 0x18, 0xfa, 0x11, 0xff >>> +}; >>> + >>> +struct bcd2000 { >>> + struct usb_device *dev; >>> + struct snd_card *card; >>> + struct usb_interface *intf; >>> + int card_index; >>> + >>> + int midi_out_active; >>> + struct snd_rawmidi *rmidi; >>> + struct snd_rawmidi_substream *midi_receive_substream; >>> + struct snd_rawmidi_substream *midi_out_substream; >>> + >>> + unsigned char midi_in_buf[BUFSIZE]; >>> + unsigned char midi_out_buf[BUFSIZE]; >>> + >>> + struct urb *midi_out_urb; >>> + struct urb *midi_in_urb; >>> + >>> + struct usb_anchor anchor; >>> +}; >>> + >>> +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; >>> +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; >>> + >>> +static DEFINE_MUTEX(devices_mutex); >>> +DECLARE_BITMAP(devices_used, SNDRV_CARDS); >>> +static struct usb_driver bcd2000_driver; >>> + >>> +#ifdef CONFIG_SND_DEBUG >>> +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) >>> +{ >>> + print_hex_dump(KERN_DEBUG, prefix, >>> + DUMP_PREFIX_NONE, 16, 1, >>> + buf, len, false); >>> +} >>> +#else >>> +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) {} >>> +#endif >>> + >>> +static int bcd2000_midi_input_open(struct snd_rawmidi_substream *substream) >>> +{ >>> + return 0; >>> +} >>> + >>> +static int bcd2000_midi_input_close(struct snd_rawmidi_substream *substream) >>> +{ >>> + return 0; >>> +} >>> + >>> +/* (de)register midi substream from client */ >>> +static void bcd2000_midi_input_trigger(struct snd_rawmidi_substream *substream, >>> + int up) >>> +{ >>> + struct bcd2000 *bcd2k = substream->rmidi->private_data; >>> + bcd2k->midi_receive_substream = up ? substream : NULL; >>> +} >>> + >>> +static void bcd2000_midi_handle_input(struct bcd2000 *bcd2k, >>> + const unsigned char *buf, unsigned int buf_len) >>> +{ >>> + unsigned int payload_length, tocopy; >>> + struct snd_rawmidi_substream *midi_receive_substream; >>> + >>> + midi_receive_substream = ACCESS_ONCE(bcd2k->midi_receive_substream); >>> + if (!midi_receive_substream) >>> + return; >>> + >>> + bcd2000_dump_buffer(PREFIX "received from device: ", buf, buf_len); >>> + >>> + if (buf_len < 2) >>> + return; >>> + >>> + payload_length = buf[0]; >>> + >>> + /* ignore packets without payload */ >>> + if (payload_length == 0) >>> + return; >>> + >>> + tocopy = min(payload_length, buf_len-1); >>> + >>> + bcd2000_dump_buffer(PREFIX "sending to userspace: ", >>> + &buf[1], tocopy); >>> + >>> + snd_rawmidi_receive(midi_receive_substream, >>> + &buf[1], tocopy); >>> +} >>> + >>> +static void bcd2000_midi_send(struct bcd2000 *bcd2k) >>> +{ >>> + int len, ret; >>> + struct snd_rawmidi_substream *midi_out_substream; >>> + >>> + BUILD_BUG_ON(sizeof(device_cmd_prefix) >= BUFSIZE); >>> + >>> + midi_out_substream = ACCESS_ONCE(bcd2k->midi_out_substream); >>> + if (!midi_out_substream) >>> + return; >>> + >>> + /* copy command prefix bytes */ >>> + memcpy(bcd2k->midi_out_buf, device_cmd_prefix, >>> + sizeof(device_cmd_prefix)); >>> + >>> + /* >>> + * get MIDI packet and leave space for command prefix >>> + * and payload length >>> + */ >>> + len = snd_rawmidi_transmit(midi_out_substream, >>> + bcd2k->midi_out_buf + 3, BUFSIZE - 3); >>> + >>> + if (len < 0) >>> + dev_err(&bcd2k->dev->dev, "%s: snd_rawmidi_transmit error %d\n", >>> + __func__, len); >>> + >>> + if (len <= 0) >>> + return; >>> + >>> + /* set payload length */ >>> + bcd2k->midi_out_buf[2] = len; >>> + bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; >>> + >>> + bcd2000_dump_buffer(PREFIX "sending to device: ", >>> + bcd2k->midi_out_buf, len+3); >>> + >>> + /* send packet to the BCD2000 */ >>> + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); >>> + if (ret < 0) >>> + dev_err(&bcd2k->dev->dev, PREFIX >>> + "%s (%p): usb_submit_urb() failed, ret=%d, len=%d\n", >>> + __func__, midi_out_substream, ret, len); >>> + else >>> + bcd2k->midi_out_active = 1; >>> +} >>> + >>> +static int bcd2000_midi_output_open(struct snd_rawmidi_substream *substream) >>> +{ >>> + return 0; >>> +} >>> + >>> +static int bcd2000_midi_output_close(struct snd_rawmidi_substream *substream) >>> +{ >>> + struct bcd2000 *bcd2k = substream->rmidi->private_data; >>> + >>> + if (bcd2k->midi_out_active) { >>> + usb_kill_urb(bcd2k->midi_out_urb); >>> + bcd2k->midi_out_active = 0; >>> + } >>> + >>> + return 0; >>> +} >>> + >>> +/* (de)register midi substream from client */ >>> +static void bcd2000_midi_output_trigger(struct snd_rawmidi_substream *substream, >>> + int up) >>> +{ >>> + struct bcd2000 *bcd2k = substream->rmidi->private_data; >>> + >>> + if (up) { >>> + bcd2k->midi_out_substream = substream; >>> + /* check if there is data userspace wants to send */ >>> + if (!bcd2k->midi_out_active) >>> + bcd2000_midi_send(bcd2k); >>> + } else { >>> + bcd2k->midi_out_substream = NULL; >>> + } >>> +} >>> + >>> +static void bcd2000_output_complete(struct urb *urb) >>> +{ >>> + struct bcd2000 *bcd2k = urb->context; >>> + >>> + bcd2k->midi_out_active = 0; >>> + >>> + if (urb->status) >>> + dev_warn(&urb->dev->dev, >>> + PREFIX "output urb->status: %d\n", urb->status); >>> + >>> + if (urb->status == -ESHUTDOWN) >>> + return; >>> + >>> + /* check if there is more data userspace wants to send */ >>> + bcd2000_midi_send(bcd2k); >>> +} >>> + >>> +static void bcd2000_input_complete(struct urb *urb) >>> +{ >>> + int ret; >>> + struct bcd2000 *bcd2k = urb->context; >>> + >>> + if (urb->status) >>> + dev_warn(&urb->dev->dev, >>> + PREFIX "input urb->status: %i\n", urb->status); >>> + >>> + if (!bcd2k || urb->status == -ESHUTDOWN) >>> + return; >>> + >>> + if (urb->actual_length > 0) >>> + bcd2000_midi_handle_input(bcd2k, urb->transfer_buffer, >>> + urb->actual_length); >>> + >>> + /* return URB to device */ >>> + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC); >>> + if (ret < 0) >>> + dev_err(&bcd2k->dev->dev, PREFIX >>> + "%s: usb_submit_urb() failed, ret=%d\n", >>> + __func__, ret); >>> +} >>> + >>> +static struct snd_rawmidi_ops bcd2000_midi_output = { >>> + .open = bcd2000_midi_output_open, >>> + .close = bcd2000_midi_output_close, >>> + .trigger = bcd2000_midi_output_trigger, >>> +}; >>> + >>> +static struct snd_rawmidi_ops bcd2000_midi_input = { >>> + .open = bcd2000_midi_input_open, >>> + .close = bcd2000_midi_input_close, >>> + .trigger = bcd2000_midi_input_trigger, >>> +}; >>> + >>> +static void bcd2000_init_device(struct bcd2000 *bcd2k) >>> +{ >>> + int ret; >>> + >>> + init_usb_anchor(&bcd2k->anchor); >>> + usb_anchor_urb(bcd2k->midi_out_urb, &bcd2k->anchor); >>> + usb_anchor_urb(bcd2k->midi_in_urb, &bcd2k->anchor); >>> + >>> + /* copy init sequence into buffer */ >>> + memcpy(bcd2k->midi_out_buf, bcd2000_init_sequence, 52); >>> + bcd2k->midi_out_urb->transfer_buffer_length = 52; >>> + >>> + /* submit sequence */ >>> + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_KERNEL); >>> + if (ret < 0) >>> + dev_err(&bcd2k->dev->dev, PREFIX >>> + "%s: usb_submit_urb() out failed, ret=%d: ", >>> + __func__, ret); >>> + else >>> + bcd2k->midi_out_active = 1; >>> + >>> + /* pass URB to device to enable button and controller events */ >>> + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_KERNEL); >>> + if (ret < 0) >>> + dev_err(&bcd2k->dev->dev, PREFIX >>> + "%s: usb_submit_urb() in failed, ret=%d: ", >>> + __func__, ret); >>> + >>> + /* ensure initialization is finished */ >>> + usb_wait_anchor_empty_timeout(&bcd2k->anchor, 1000); >>> +} >>> + >>> +static int bcd2000_init_midi(struct bcd2000 *bcd2k) >>> +{ >>> + int ret; >>> + struct snd_rawmidi *rmidi; >>> + >>> + ret = snd_rawmidi_new(bcd2k->card, bcd2k->card->shortname, 0, >>> + 1, /* output */ >>> + 1, /* input */ >>> + &rmidi); >>> + >>> + if (ret < 0) >>> + return ret; >>> + >>> + strlcpy(rmidi->name, bcd2k->card->shortname, sizeof(rmidi->name)); >>> + >>> + rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX; >>> + rmidi->private_data = bcd2k; >>> + >>> + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; >>> + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, >>> + &bcd2000_midi_output); >>> + >>> + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; >>> + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, >>> + &bcd2000_midi_input); >>> + >>> + bcd2k->rmidi = rmidi; >>> + >>> + bcd2k->midi_in_urb = usb_alloc_urb(0, GFP_KERNEL); >>> + bcd2k->midi_out_urb = usb_alloc_urb(0, GFP_KERNEL); >>> + >>> + if (!bcd2k->midi_in_urb || !bcd2k->midi_out_urb) { >>> + dev_err(&bcd2k->dev->dev, PREFIX "usb_alloc_urb failed\n"); >>> + return -ENOMEM; >>> + } >>> + >>> + usb_fill_int_urb(bcd2k->midi_in_urb, bcd2k->dev, >>> + usb_rcvintpipe(bcd2k->dev, 0x81), >>> + bcd2k->midi_in_buf, BUFSIZE, >>> + bcd2000_input_complete, bcd2k, 1); >>> + >>> + usb_fill_int_urb(bcd2k->midi_out_urb, bcd2k->dev, >>> + usb_sndintpipe(bcd2k->dev, 0x1), >>> + bcd2k->midi_out_buf, BUFSIZE, >>> + bcd2000_output_complete, bcd2k, 1); >>> + >>> + bcd2000_init_device(bcd2k); >>> + >>> + return 0; >>> +} >>> + >>> +static void bcd2000_free_usb_related_resources(struct bcd2000 *bcd2k, >>> + struct usb_interface *interface) >>> +{ >>> + /* usb_kill_urb not necessary, urb is aborted automatically */ >>> + >>> + usb_free_urb(bcd2k->midi_out_urb); >>> + usb_free_urb(bcd2k->midi_in_urb); >>> + >>> + if (bcd2k->intf) { >>> + usb_set_intfdata(bcd2k->intf, NULL); >>> + bcd2k->intf = NULL; >>> + } >>> +} >>> + >>> +static int bcd2000_probe(struct usb_interface *interface, >>> + const struct usb_device_id *usb_id) >>> +{ >>> + struct snd_card *card; >>> + struct bcd2000 *bcd2k; >>> + unsigned int card_index; >>> + char usb_path[32]; >>> + int err; >>> + >>> + mutex_lock(&devices_mutex); >>> + >>> + for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) >>> + if (!test_bit(card_index, devices_used)) >>> + break; >>> + >>> + if (card_index >= SNDRV_CARDS) { >>> + mutex_unlock(&devices_mutex); >>> + return -ENOENT; >>> + } >>> + >>> + err = snd_card_new(&interface->dev, index[card_index], id[card_index], >>> + THIS_MODULE, sizeof(*bcd2k), &card); >>> + if (err < 0) { >>> + mutex_unlock(&devices_mutex); >>> + return err; >>> + } >>> + >>> + bcd2k = card->private_data; >>> + bcd2k->dev = interface_to_usbdev(interface); >>> + bcd2k->card = card; >>> + bcd2k->card_index = card_index; >>> + bcd2k->intf = interface; >>> + >>> + snd_card_set_dev(card, &interface->dev); >>> + >>> + strncpy(card->driver, "snd-bcd2000", sizeof(card->driver)); >>> + strncpy(card->shortname, "BCD2000", sizeof(card->shortname)); >>> + usb_make_path(bcd2k->dev, usb_path, sizeof(usb_path)); >>> + snprintf(bcd2k->card->longname, sizeof(bcd2k->card->longname), >>> + "Behringer BCD2000 at %s", >>> + usb_path); >>> + >>> + err = bcd2000_init_midi(bcd2k); >>> + if (err < 0) >>> + goto probe_error; >>> + >>> + err = snd_card_register(card); >>> + if (err < 0) >>> + goto probe_error; >>> + >>> + usb_set_intfdata(interface, bcd2k); >>> + set_bit(card_index, devices_used); >>> + >>> + mutex_unlock(&devices_mutex); >>> + return 0; >>> + >>> +probe_error: >>> + dev_info(&bcd2k->dev->dev, PREFIX "error during probing"); >>> + bcd2000_free_usb_related_resources(bcd2k, interface); >>> + snd_card_free(card); >>> + mutex_unlock(&devices_mutex); >>> + return err; >>> +} >>> + >>> +static void bcd2000_disconnect(struct usb_interface *interface) >>> +{ >>> + struct bcd2000 *bcd2k = usb_get_intfdata(interface); >>> + >>> + if (!bcd2k) >>> + return; >>> + >>> + mutex_lock(&devices_mutex); >>> + >>> + /* make sure that userspace cannot create new requests */ >>> + snd_card_disconnect(bcd2k->card); >>> + >>> + bcd2000_free_usb_related_resources(bcd2k, interface); >>> + >>> + clear_bit(bcd2k->card_index, devices_used); >>> + >>> + snd_card_free_when_closed(bcd2k->card); >>> + >>> + mutex_unlock(&devices_mutex); >>> +} >>> + >>> +static struct usb_driver bcd2000_driver = { >>> + .name = "snd-bcd2000", >>> + .probe = bcd2000_probe, >>> + .disconnect = bcd2000_disconnect, >>> + .id_table = id_table, >>> +}; >>> + >>> +module_usb_driver(bcd2000_driver); >>> + >>> +MODULE_DEVICE_TABLE(usb, id_table); >>> +MODULE_AUTHOR("Mario Kicherer, dev@kicherer.org"); >>> +MODULE_DESCRIPTION("Behringer BCD2000 driver"); >>> +MODULE_LICENSE("GPL"); >>> >> > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@alsa-project.org > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel >
Mario Kicherer wrote: > This patch adds initial support for the Behringer BCD2000 USB DJ controller. > At the moment, only the MIDI part of the device is working, i.e. knobs, > buttons and LEDs. > > I also plan to add support for the audio part, but I assume that this will > require more effort than the rather simple MIDI interface. Progress can be > tracked at https://github.com/anyc/snd-usb-bcd2000. > > Signed-off-by: Mario Kicherer <dev@kicherer.org> Reviewed-by: Clemens Ladisch <clemens@ladisch.de>
At Fri, 4 Apr 2014 20:40:50 +0200, Mario Kicherer wrote: > > This patch adds initial support for the Behringer BCD2000 USB DJ controller. > At the moment, only the MIDI part of the device is working, i.e. knobs, > buttons and LEDs. > > I also plan to add support for the audio part, but I assume that this will > require more effort than the rather simple MIDI interface. Progress can be > tracked at https://github.com/anyc/snd-usb-bcd2000. > > Signed-off-by: Mario Kicherer <dev@kicherer.org> Now I applied the patch with review tags by Daniel and Clemens. It'll be merged to linux-next branch once when the 3.15 merge window is closed. Thanks! Takashi > --- > > Changes since v8: > - module_usb_driver() macro for module initialization > - improved some comments > > Changes since v7: > - replaced snd_card_create with snd_card_new > > Changes since v6: > - applied more style improvements > > Changes since v5: > - use kernel bitmap functions for devices_used > > Changes since v4: > - devices_used as array to support arbitrary number of SNDRV_CARDS > - removed unused array "enable" > > Changes since v3: > - applied style and snd_printk changes as suggested by Daniel Mack > > Changes since v2: > - applied more changes from Daniel Mack and Clemens Ladisch > > Changes since v1: > - fixed the various code style issues, thanks to Daniel Mack and > checkpatch.pl. > > sound/usb/Kconfig | 13 ++ > sound/usb/Makefile | 2 +- > sound/usb/bcd2000/Makefile | 3 + > sound/usb/bcd2000/bcd2000.c | 461 ++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 478 insertions(+), 1 deletion(-) > create mode 100644 sound/usb/bcd2000/Makefile > create mode 100644 sound/usb/bcd2000/bcd2000.c > > diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig > index e05a86b..d393153 100644 > --- a/sound/usb/Kconfig > +++ b/sound/usb/Kconfig > @@ -147,5 +147,18 @@ config SND_USB_HIFACE > To compile this driver as a module, choose M here: the module > will be called snd-usb-hiface. > > +config SND_BCD2000 > + tristate "Behringer BCD2000 MIDI driver" > + select SND_RAWMIDI > + help > + Say Y here to include MIDI support for the Behringer BCD2000 DJ > + controller. > + > + Audio support is still work-in-progress at > + https://github.com/anyc/snd-usb-bcd2000 > + > + To compile this driver as a module, choose M here: the module > + will be called snd-bcd2000. > + > endif # SND_USB > > diff --git a/sound/usb/Makefile b/sound/usb/Makefile > index abe668f..2b92f0d 100644 > --- a/sound/usb/Makefile > +++ b/sound/usb/Makefile > @@ -23,4 +23,4 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o > obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o > obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o > > -obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ > +obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ > diff --git a/sound/usb/bcd2000/Makefile b/sound/usb/bcd2000/Makefile > new file mode 100644 > index 0000000..f09ccc0 > --- /dev/null > +++ b/sound/usb/bcd2000/Makefile > @@ -0,0 +1,3 @@ > +snd-bcd2000-y := bcd2000.o > + > +obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o > \ No newline at end of file > diff --git a/sound/usb/bcd2000/bcd2000.c b/sound/usb/bcd2000/bcd2000.c > new file mode 100644 > index 0000000..820d6ca > --- /dev/null > +++ b/sound/usb/bcd2000/bcd2000.c > @@ -0,0 +1,461 @@ > +/* > + * Behringer BCD2000 driver > + * > + * Copyright (C) 2014 Mario Kicherer (dev@kicherer.org) > + * > + * 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. > + * > + * 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. > + */ > + > +#include <linux/kernel.h> > +#include <linux/errno.h> > +#include <linux/init.h> > +#include <linux/slab.h> > +#include <linux/module.h> > +#include <linux/bitmap.h> > +#include <linux/usb.h> > +#include <linux/usb/audio.h> > +#include <sound/core.h> > +#include <sound/initval.h> > +#include <sound/rawmidi.h> > + > +#define PREFIX "snd-bcd2000: " > +#define BUFSIZE 64 > + > +static struct usb_device_id id_table[] = { > + { USB_DEVICE(0x1397, 0x00bd) }, > + { }, > +}; > + > +static unsigned char device_cmd_prefix[] = {0x03, 0x00}; > + > +static unsigned char bcd2000_init_sequence[] = { > + 0x07, 0x00, 0x00, 0x00, 0x78, 0x48, 0x1c, 0x81, > + 0xc4, 0x00, 0x00, 0x00, 0x5e, 0x53, 0x4a, 0xf7, > + 0x18, 0xfa, 0x11, 0xff, 0x6c, 0xf3, 0x90, 0xff, > + 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, > + 0x18, 0xfa, 0x11, 0xff, 0x14, 0x00, 0x00, 0x00, > + 0x00, 0x00, 0x00, 0x00, 0xf2, 0x34, 0x4a, 0xf7, > + 0x18, 0xfa, 0x11, 0xff > +}; > + > +struct bcd2000 { > + struct usb_device *dev; > + struct snd_card *card; > + struct usb_interface *intf; > + int card_index; > + > + int midi_out_active; > + struct snd_rawmidi *rmidi; > + struct snd_rawmidi_substream *midi_receive_substream; > + struct snd_rawmidi_substream *midi_out_substream; > + > + unsigned char midi_in_buf[BUFSIZE]; > + unsigned char midi_out_buf[BUFSIZE]; > + > + struct urb *midi_out_urb; > + struct urb *midi_in_urb; > + > + struct usb_anchor anchor; > +}; > + > +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; > +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; > + > +static DEFINE_MUTEX(devices_mutex); > +DECLARE_BITMAP(devices_used, SNDRV_CARDS); > +static struct usb_driver bcd2000_driver; > + > +#ifdef CONFIG_SND_DEBUG > +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) > +{ > + print_hex_dump(KERN_DEBUG, prefix, > + DUMP_PREFIX_NONE, 16, 1, > + buf, len, false); > +} > +#else > +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) {} > +#endif > + > +static int bcd2000_midi_input_open(struct snd_rawmidi_substream *substream) > +{ > + return 0; > +} > + > +static int bcd2000_midi_input_close(struct snd_rawmidi_substream *substream) > +{ > + return 0; > +} > + > +/* (de)register midi substream from client */ > +static void bcd2000_midi_input_trigger(struct snd_rawmidi_substream *substream, > + int up) > +{ > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > + bcd2k->midi_receive_substream = up ? substream : NULL; > +} > + > +static void bcd2000_midi_handle_input(struct bcd2000 *bcd2k, > + const unsigned char *buf, unsigned int buf_len) > +{ > + unsigned int payload_length, tocopy; > + struct snd_rawmidi_substream *midi_receive_substream; > + > + midi_receive_substream = ACCESS_ONCE(bcd2k->midi_receive_substream); > + if (!midi_receive_substream) > + return; > + > + bcd2000_dump_buffer(PREFIX "received from device: ", buf, buf_len); > + > + if (buf_len < 2) > + return; > + > + payload_length = buf[0]; > + > + /* ignore packets without payload */ > + if (payload_length == 0) > + return; > + > + tocopy = min(payload_length, buf_len-1); > + > + bcd2000_dump_buffer(PREFIX "sending to userspace: ", > + &buf[1], tocopy); > + > + snd_rawmidi_receive(midi_receive_substream, > + &buf[1], tocopy); > +} > + > +static void bcd2000_midi_send(struct bcd2000 *bcd2k) > +{ > + int len, ret; > + struct snd_rawmidi_substream *midi_out_substream; > + > + BUILD_BUG_ON(sizeof(device_cmd_prefix) >= BUFSIZE); > + > + midi_out_substream = ACCESS_ONCE(bcd2k->midi_out_substream); > + if (!midi_out_substream) > + return; > + > + /* copy command prefix bytes */ > + memcpy(bcd2k->midi_out_buf, device_cmd_prefix, > + sizeof(device_cmd_prefix)); > + > + /* > + * get MIDI packet and leave space for command prefix > + * and payload length > + */ > + len = snd_rawmidi_transmit(midi_out_substream, > + bcd2k->midi_out_buf + 3, BUFSIZE - 3); > + > + if (len < 0) > + dev_err(&bcd2k->dev->dev, "%s: snd_rawmidi_transmit error %d\n", > + __func__, len); > + > + if (len <= 0) > + return; > + > + /* set payload length */ > + bcd2k->midi_out_buf[2] = len; > + bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; > + > + bcd2000_dump_buffer(PREFIX "sending to device: ", > + bcd2k->midi_out_buf, len+3); > + > + /* send packet to the BCD2000 */ > + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s (%p): usb_submit_urb() failed, ret=%d, len=%d\n", > + __func__, midi_out_substream, ret, len); > + else > + bcd2k->midi_out_active = 1; > +} > + > +static int bcd2000_midi_output_open(struct snd_rawmidi_substream *substream) > +{ > + return 0; > +} > + > +static int bcd2000_midi_output_close(struct snd_rawmidi_substream *substream) > +{ > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > + > + if (bcd2k->midi_out_active) { > + usb_kill_urb(bcd2k->midi_out_urb); > + bcd2k->midi_out_active = 0; > + } > + > + return 0; > +} > + > +/* (de)register midi substream from client */ > +static void bcd2000_midi_output_trigger(struct snd_rawmidi_substream *substream, > + int up) > +{ > + struct bcd2000 *bcd2k = substream->rmidi->private_data; > + > + if (up) { > + bcd2k->midi_out_substream = substream; > + /* check if there is data userspace wants to send */ > + if (!bcd2k->midi_out_active) > + bcd2000_midi_send(bcd2k); > + } else { > + bcd2k->midi_out_substream = NULL; > + } > +} > + > +static void bcd2000_output_complete(struct urb *urb) > +{ > + struct bcd2000 *bcd2k = urb->context; > + > + bcd2k->midi_out_active = 0; > + > + if (urb->status) > + dev_warn(&urb->dev->dev, > + PREFIX "output urb->status: %d\n", urb->status); > + > + if (urb->status == -ESHUTDOWN) > + return; > + > + /* check if there is more data userspace wants to send */ > + bcd2000_midi_send(bcd2k); > +} > + > +static void bcd2000_input_complete(struct urb *urb) > +{ > + int ret; > + struct bcd2000 *bcd2k = urb->context; > + > + if (urb->status) > + dev_warn(&urb->dev->dev, > + PREFIX "input urb->status: %i\n", urb->status); > + > + if (!bcd2k || urb->status == -ESHUTDOWN) > + return; > + > + if (urb->actual_length > 0) > + bcd2000_midi_handle_input(bcd2k, urb->transfer_buffer, > + urb->actual_length); > + > + /* return URB to device */ > + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s: usb_submit_urb() failed, ret=%d\n", > + __func__, ret); > +} > + > +static struct snd_rawmidi_ops bcd2000_midi_output = { > + .open = bcd2000_midi_output_open, > + .close = bcd2000_midi_output_close, > + .trigger = bcd2000_midi_output_trigger, > +}; > + > +static struct snd_rawmidi_ops bcd2000_midi_input = { > + .open = bcd2000_midi_input_open, > + .close = bcd2000_midi_input_close, > + .trigger = bcd2000_midi_input_trigger, > +}; > + > +static void bcd2000_init_device(struct bcd2000 *bcd2k) > +{ > + int ret; > + > + init_usb_anchor(&bcd2k->anchor); > + usb_anchor_urb(bcd2k->midi_out_urb, &bcd2k->anchor); > + usb_anchor_urb(bcd2k->midi_in_urb, &bcd2k->anchor); > + > + /* copy init sequence into buffer */ > + memcpy(bcd2k->midi_out_buf, bcd2000_init_sequence, 52); > + bcd2k->midi_out_urb->transfer_buffer_length = 52; > + > + /* submit sequence */ > + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_KERNEL); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s: usb_submit_urb() out failed, ret=%d: ", > + __func__, ret); > + else > + bcd2k->midi_out_active = 1; > + > + /* pass URB to device to enable button and controller events */ > + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_KERNEL); > + if (ret < 0) > + dev_err(&bcd2k->dev->dev, PREFIX > + "%s: usb_submit_urb() in failed, ret=%d: ", > + __func__, ret); > + > + /* ensure initialization is finished */ > + usb_wait_anchor_empty_timeout(&bcd2k->anchor, 1000); > +} > + > +static int bcd2000_init_midi(struct bcd2000 *bcd2k) > +{ > + int ret; > + struct snd_rawmidi *rmidi; > + > + ret = snd_rawmidi_new(bcd2k->card, bcd2k->card->shortname, 0, > + 1, /* output */ > + 1, /* input */ > + &rmidi); > + > + if (ret < 0) > + return ret; > + > + strlcpy(rmidi->name, bcd2k->card->shortname, sizeof(rmidi->name)); > + > + rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX; > + rmidi->private_data = bcd2k; > + > + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; > + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, > + &bcd2000_midi_output); > + > + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; > + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, > + &bcd2000_midi_input); > + > + bcd2k->rmidi = rmidi; > + > + bcd2k->midi_in_urb = usb_alloc_urb(0, GFP_KERNEL); > + bcd2k->midi_out_urb = usb_alloc_urb(0, GFP_KERNEL); > + > + if (!bcd2k->midi_in_urb || !bcd2k->midi_out_urb) { > + dev_err(&bcd2k->dev->dev, PREFIX "usb_alloc_urb failed\n"); > + return -ENOMEM; > + } > + > + usb_fill_int_urb(bcd2k->midi_in_urb, bcd2k->dev, > + usb_rcvintpipe(bcd2k->dev, 0x81), > + bcd2k->midi_in_buf, BUFSIZE, > + bcd2000_input_complete, bcd2k, 1); > + > + usb_fill_int_urb(bcd2k->midi_out_urb, bcd2k->dev, > + usb_sndintpipe(bcd2k->dev, 0x1), > + bcd2k->midi_out_buf, BUFSIZE, > + bcd2000_output_complete, bcd2k, 1); > + > + bcd2000_init_device(bcd2k); > + > + return 0; > +} > + > +static void bcd2000_free_usb_related_resources(struct bcd2000 *bcd2k, > + struct usb_interface *interface) > +{ > + /* usb_kill_urb not necessary, urb is aborted automatically */ > + > + usb_free_urb(bcd2k->midi_out_urb); > + usb_free_urb(bcd2k->midi_in_urb); > + > + if (bcd2k->intf) { > + usb_set_intfdata(bcd2k->intf, NULL); > + bcd2k->intf = NULL; > + } > +} > + > +static int bcd2000_probe(struct usb_interface *interface, > + const struct usb_device_id *usb_id) > +{ > + struct snd_card *card; > + struct bcd2000 *bcd2k; > + unsigned int card_index; > + char usb_path[32]; > + int err; > + > + mutex_lock(&devices_mutex); > + > + for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) > + if (!test_bit(card_index, devices_used)) > + break; > + > + if (card_index >= SNDRV_CARDS) { > + mutex_unlock(&devices_mutex); > + return -ENOENT; > + } > + > + err = snd_card_new(&interface->dev, index[card_index], id[card_index], > + THIS_MODULE, sizeof(*bcd2k), &card); > + if (err < 0) { > + mutex_unlock(&devices_mutex); > + return err; > + } > + > + bcd2k = card->private_data; > + bcd2k->dev = interface_to_usbdev(interface); > + bcd2k->card = card; > + bcd2k->card_index = card_index; > + bcd2k->intf = interface; > + > + snd_card_set_dev(card, &interface->dev); > + > + strncpy(card->driver, "snd-bcd2000", sizeof(card->driver)); > + strncpy(card->shortname, "BCD2000", sizeof(card->shortname)); > + usb_make_path(bcd2k->dev, usb_path, sizeof(usb_path)); > + snprintf(bcd2k->card->longname, sizeof(bcd2k->card->longname), > + "Behringer BCD2000 at %s", > + usb_path); > + > + err = bcd2000_init_midi(bcd2k); > + if (err < 0) > + goto probe_error; > + > + err = snd_card_register(card); > + if (err < 0) > + goto probe_error; > + > + usb_set_intfdata(interface, bcd2k); > + set_bit(card_index, devices_used); > + > + mutex_unlock(&devices_mutex); > + return 0; > + > +probe_error: > + dev_info(&bcd2k->dev->dev, PREFIX "error during probing"); > + bcd2000_free_usb_related_resources(bcd2k, interface); > + snd_card_free(card); > + mutex_unlock(&devices_mutex); > + return err; > +} > + > +static void bcd2000_disconnect(struct usb_interface *interface) > +{ > + struct bcd2000 *bcd2k = usb_get_intfdata(interface); > + > + if (!bcd2k) > + return; > + > + mutex_lock(&devices_mutex); > + > + /* make sure that userspace cannot create new requests */ > + snd_card_disconnect(bcd2k->card); > + > + bcd2000_free_usb_related_resources(bcd2k, interface); > + > + clear_bit(bcd2k->card_index, devices_used); > + > + snd_card_free_when_closed(bcd2k->card); > + > + mutex_unlock(&devices_mutex); > +} > + > +static struct usb_driver bcd2000_driver = { > + .name = "snd-bcd2000", > + .probe = bcd2000_probe, > + .disconnect = bcd2000_disconnect, > + .id_table = id_table, > +}; > + > +module_usb_driver(bcd2000_driver); > + > +MODULE_DEVICE_TABLE(usb, id_table); > +MODULE_AUTHOR("Mario Kicherer, dev@kicherer.org"); > +MODULE_DESCRIPTION("Behringer BCD2000 driver"); > +MODULE_LICENSE("GPL"); > -- > 1.8.3.2 >
diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig index e05a86b..d393153 100644 --- a/sound/usb/Kconfig +++ b/sound/usb/Kconfig @@ -147,5 +147,18 @@ config SND_USB_HIFACE To compile this driver as a module, choose M here: the module will be called snd-usb-hiface. +config SND_BCD2000 + tristate "Behringer BCD2000 MIDI driver" + select SND_RAWMIDI + help + Say Y here to include MIDI support for the Behringer BCD2000 DJ + controller. + + Audio support is still work-in-progress at + https://github.com/anyc/snd-usb-bcd2000 + + To compile this driver as a module, choose M here: the module + will be called snd-bcd2000. + endif # SND_USB diff --git a/sound/usb/Makefile b/sound/usb/Makefile index abe668f..2b92f0d 100644 --- a/sound/usb/Makefile +++ b/sound/usb/Makefile @@ -23,4 +23,4 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o -obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ +obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ diff --git a/sound/usb/bcd2000/Makefile b/sound/usb/bcd2000/Makefile new file mode 100644 index 0000000..f09ccc0 --- /dev/null +++ b/sound/usb/bcd2000/Makefile @@ -0,0 +1,3 @@ +snd-bcd2000-y := bcd2000.o + +obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o \ No newline at end of file diff --git a/sound/usb/bcd2000/bcd2000.c b/sound/usb/bcd2000/bcd2000.c new file mode 100644 index 0000000..820d6ca --- /dev/null +++ b/sound/usb/bcd2000/bcd2000.c @@ -0,0 +1,461 @@ +/* + * Behringer BCD2000 driver + * + * Copyright (C) 2014 Mario Kicherer (dev@kicherer.org) + * + * 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. + * + * 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. + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/bitmap.h> +#include <linux/usb.h> +#include <linux/usb/audio.h> +#include <sound/core.h> +#include <sound/initval.h> +#include <sound/rawmidi.h> + +#define PREFIX "snd-bcd2000: " +#define BUFSIZE 64 + +static struct usb_device_id id_table[] = { + { USB_DEVICE(0x1397, 0x00bd) }, + { }, +}; + +static unsigned char device_cmd_prefix[] = {0x03, 0x00}; + +static unsigned char bcd2000_init_sequence[] = { + 0x07, 0x00, 0x00, 0x00, 0x78, 0x48, 0x1c, 0x81, + 0xc4, 0x00, 0x00, 0x00, 0x5e, 0x53, 0x4a, 0xf7, + 0x18, 0xfa, 0x11, 0xff, 0x6c, 0xf3, 0x90, 0xff, + 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, + 0x18, 0xfa, 0x11, 0xff, 0x14, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0xf2, 0x34, 0x4a, 0xf7, + 0x18, 0xfa, 0x11, 0xff +}; + +struct bcd2000 { + struct usb_device *dev; + struct snd_card *card; + struct usb_interface *intf; + int card_index; + + int midi_out_active; + struct snd_rawmidi *rmidi; + struct snd_rawmidi_substream *midi_receive_substream; + struct snd_rawmidi_substream *midi_out_substream; + + unsigned char midi_in_buf[BUFSIZE]; + unsigned char midi_out_buf[BUFSIZE]; + + struct urb *midi_out_urb; + struct urb *midi_in_urb; + + struct usb_anchor anchor; +}; + +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; + +static DEFINE_MUTEX(devices_mutex); +DECLARE_BITMAP(devices_used, SNDRV_CARDS); +static struct usb_driver bcd2000_driver; + +#ifdef CONFIG_SND_DEBUG +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) +{ + print_hex_dump(KERN_DEBUG, prefix, + DUMP_PREFIX_NONE, 16, 1, + buf, len, false); +} +#else +static void bcd2000_dump_buffer(const char *prefix, const char *buf, int len) {} +#endif + +static int bcd2000_midi_input_open(struct snd_rawmidi_substream *substream) +{ + return 0; +} + +static int bcd2000_midi_input_close(struct snd_rawmidi_substream *substream) +{ + return 0; +} + +/* (de)register midi substream from client */ +static void bcd2000_midi_input_trigger(struct snd_rawmidi_substream *substream, + int up) +{ + struct bcd2000 *bcd2k = substream->rmidi->private_data; + bcd2k->midi_receive_substream = up ? substream : NULL; +} + +static void bcd2000_midi_handle_input(struct bcd2000 *bcd2k, + const unsigned char *buf, unsigned int buf_len) +{ + unsigned int payload_length, tocopy; + struct snd_rawmidi_substream *midi_receive_substream; + + midi_receive_substream = ACCESS_ONCE(bcd2k->midi_receive_substream); + if (!midi_receive_substream) + return; + + bcd2000_dump_buffer(PREFIX "received from device: ", buf, buf_len); + + if (buf_len < 2) + return; + + payload_length = buf[0]; + + /* ignore packets without payload */ + if (payload_length == 0) + return; + + tocopy = min(payload_length, buf_len-1); + + bcd2000_dump_buffer(PREFIX "sending to userspace: ", + &buf[1], tocopy); + + snd_rawmidi_receive(midi_receive_substream, + &buf[1], tocopy); +} + +static void bcd2000_midi_send(struct bcd2000 *bcd2k) +{ + int len, ret; + struct snd_rawmidi_substream *midi_out_substream; + + BUILD_BUG_ON(sizeof(device_cmd_prefix) >= BUFSIZE); + + midi_out_substream = ACCESS_ONCE(bcd2k->midi_out_substream); + if (!midi_out_substream) + return; + + /* copy command prefix bytes */ + memcpy(bcd2k->midi_out_buf, device_cmd_prefix, + sizeof(device_cmd_prefix)); + + /* + * get MIDI packet and leave space for command prefix + * and payload length + */ + len = snd_rawmidi_transmit(midi_out_substream, + bcd2k->midi_out_buf + 3, BUFSIZE - 3); + + if (len < 0) + dev_err(&bcd2k->dev->dev, "%s: snd_rawmidi_transmit error %d\n", + __func__, len); + + if (len <= 0) + return; + + /* set payload length */ + bcd2k->midi_out_buf[2] = len; + bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; + + bcd2000_dump_buffer(PREFIX "sending to device: ", + bcd2k->midi_out_buf, len+3); + + /* send packet to the BCD2000 */ + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); + if (ret < 0) + dev_err(&bcd2k->dev->dev, PREFIX + "%s (%p): usb_submit_urb() failed, ret=%d, len=%d\n", + __func__, midi_out_substream, ret, len); + else + bcd2k->midi_out_active = 1; +} + +static int bcd2000_midi_output_open(struct snd_rawmidi_substream *substream) +{ + return 0; +} + +static int bcd2000_midi_output_close(struct snd_rawmidi_substream *substream) +{ + struct bcd2000 *bcd2k = substream->rmidi->private_data; + + if (bcd2k->midi_out_active) { + usb_kill_urb(bcd2k->midi_out_urb); + bcd2k->midi_out_active = 0; + } + + return 0; +} + +/* (de)register midi substream from client */ +static void bcd2000_midi_output_trigger(struct snd_rawmidi_substream *substream, + int up) +{ + struct bcd2000 *bcd2k = substream->rmidi->private_data; + + if (up) { + bcd2k->midi_out_substream = substream; + /* check if there is data userspace wants to send */ + if (!bcd2k->midi_out_active) + bcd2000_midi_send(bcd2k); + } else { + bcd2k->midi_out_substream = NULL; + } +} + +static void bcd2000_output_complete(struct urb *urb) +{ + struct bcd2000 *bcd2k = urb->context; + + bcd2k->midi_out_active = 0; + + if (urb->status) + dev_warn(&urb->dev->dev, + PREFIX "output urb->status: %d\n", urb->status); + + if (urb->status == -ESHUTDOWN) + return; + + /* check if there is more data userspace wants to send */ + bcd2000_midi_send(bcd2k); +} + +static void bcd2000_input_complete(struct urb *urb) +{ + int ret; + struct bcd2000 *bcd2k = urb->context; + + if (urb->status) + dev_warn(&urb->dev->dev, + PREFIX "input urb->status: %i\n", urb->status); + + if (!bcd2k || urb->status == -ESHUTDOWN) + return; + + if (urb->actual_length > 0) + bcd2000_midi_handle_input(bcd2k, urb->transfer_buffer, + urb->actual_length); + + /* return URB to device */ + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC); + if (ret < 0) + dev_err(&bcd2k->dev->dev, PREFIX + "%s: usb_submit_urb() failed, ret=%d\n", + __func__, ret); +} + +static struct snd_rawmidi_ops bcd2000_midi_output = { + .open = bcd2000_midi_output_open, + .close = bcd2000_midi_output_close, + .trigger = bcd2000_midi_output_trigger, +}; + +static struct snd_rawmidi_ops bcd2000_midi_input = { + .open = bcd2000_midi_input_open, + .close = bcd2000_midi_input_close, + .trigger = bcd2000_midi_input_trigger, +}; + +static void bcd2000_init_device(struct bcd2000 *bcd2k) +{ + int ret; + + init_usb_anchor(&bcd2k->anchor); + usb_anchor_urb(bcd2k->midi_out_urb, &bcd2k->anchor); + usb_anchor_urb(bcd2k->midi_in_urb, &bcd2k->anchor); + + /* copy init sequence into buffer */ + memcpy(bcd2k->midi_out_buf, bcd2000_init_sequence, 52); + bcd2k->midi_out_urb->transfer_buffer_length = 52; + + /* submit sequence */ + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_KERNEL); + if (ret < 0) + dev_err(&bcd2k->dev->dev, PREFIX + "%s: usb_submit_urb() out failed, ret=%d: ", + __func__, ret); + else + bcd2k->midi_out_active = 1; + + /* pass URB to device to enable button and controller events */ + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_KERNEL); + if (ret < 0) + dev_err(&bcd2k->dev->dev, PREFIX + "%s: usb_submit_urb() in failed, ret=%d: ", + __func__, ret); + + /* ensure initialization is finished */ + usb_wait_anchor_empty_timeout(&bcd2k->anchor, 1000); +} + +static int bcd2000_init_midi(struct bcd2000 *bcd2k) +{ + int ret; + struct snd_rawmidi *rmidi; + + ret = snd_rawmidi_new(bcd2k->card, bcd2k->card->shortname, 0, + 1, /* output */ + 1, /* input */ + &rmidi); + + if (ret < 0) + return ret; + + strlcpy(rmidi->name, bcd2k->card->shortname, sizeof(rmidi->name)); + + rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX; + rmidi->private_data = bcd2k; + + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, + &bcd2000_midi_output); + + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, + &bcd2000_midi_input); + + bcd2k->rmidi = rmidi; + + bcd2k->midi_in_urb = usb_alloc_urb(0, GFP_KERNEL); + bcd2k->midi_out_urb = usb_alloc_urb(0, GFP_KERNEL); + + if (!bcd2k->midi_in_urb || !bcd2k->midi_out_urb) { + dev_err(&bcd2k->dev->dev, PREFIX "usb_alloc_urb failed\n"); + return -ENOMEM; + } + + usb_fill_int_urb(bcd2k->midi_in_urb, bcd2k->dev, + usb_rcvintpipe(bcd2k->dev, 0x81), + bcd2k->midi_in_buf, BUFSIZE, + bcd2000_input_complete, bcd2k, 1); + + usb_fill_int_urb(bcd2k->midi_out_urb, bcd2k->dev, + usb_sndintpipe(bcd2k->dev, 0x1), + bcd2k->midi_out_buf, BUFSIZE, + bcd2000_output_complete, bcd2k, 1); + + bcd2000_init_device(bcd2k); + + return 0; +} + +static void bcd2000_free_usb_related_resources(struct bcd2000 *bcd2k, + struct usb_interface *interface) +{ + /* usb_kill_urb not necessary, urb is aborted automatically */ + + usb_free_urb(bcd2k->midi_out_urb); + usb_free_urb(bcd2k->midi_in_urb); + + if (bcd2k->intf) { + usb_set_intfdata(bcd2k->intf, NULL); + bcd2k->intf = NULL; + } +} + +static int bcd2000_probe(struct usb_interface *interface, + const struct usb_device_id *usb_id) +{ + struct snd_card *card; + struct bcd2000 *bcd2k; + unsigned int card_index; + char usb_path[32]; + int err; + + mutex_lock(&devices_mutex); + + for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) + if (!test_bit(card_index, devices_used)) + break; + + if (card_index >= SNDRV_CARDS) { + mutex_unlock(&devices_mutex); + return -ENOENT; + } + + err = snd_card_new(&interface->dev, index[card_index], id[card_index], + THIS_MODULE, sizeof(*bcd2k), &card); + if (err < 0) { + mutex_unlock(&devices_mutex); + return err; + } + + bcd2k = card->private_data; + bcd2k->dev = interface_to_usbdev(interface); + bcd2k->card = card; + bcd2k->card_index = card_index; + bcd2k->intf = interface; + + snd_card_set_dev(card, &interface->dev); + + strncpy(card->driver, "snd-bcd2000", sizeof(card->driver)); + strncpy(card->shortname, "BCD2000", sizeof(card->shortname)); + usb_make_path(bcd2k->dev, usb_path, sizeof(usb_path)); + snprintf(bcd2k->card->longname, sizeof(bcd2k->card->longname), + "Behringer BCD2000 at %s", + usb_path); + + err = bcd2000_init_midi(bcd2k); + if (err < 0) + goto probe_error; + + err = snd_card_register(card); + if (err < 0) + goto probe_error; + + usb_set_intfdata(interface, bcd2k); + set_bit(card_index, devices_used); + + mutex_unlock(&devices_mutex); + return 0; + +probe_error: + dev_info(&bcd2k->dev->dev, PREFIX "error during probing"); + bcd2000_free_usb_related_resources(bcd2k, interface); + snd_card_free(card); + mutex_unlock(&devices_mutex); + return err; +} + +static void bcd2000_disconnect(struct usb_interface *interface) +{ + struct bcd2000 *bcd2k = usb_get_intfdata(interface); + + if (!bcd2k) + return; + + mutex_lock(&devices_mutex); + + /* make sure that userspace cannot create new requests */ + snd_card_disconnect(bcd2k->card); + + bcd2000_free_usb_related_resources(bcd2k, interface); + + clear_bit(bcd2k->card_index, devices_used); + + snd_card_free_when_closed(bcd2k->card); + + mutex_unlock(&devices_mutex); +} + +static struct usb_driver bcd2000_driver = { + .name = "snd-bcd2000", + .probe = bcd2000_probe, + .disconnect = bcd2000_disconnect, + .id_table = id_table, +}; + +module_usb_driver(bcd2000_driver); + +MODULE_DEVICE_TABLE(usb, id_table); +MODULE_AUTHOR("Mario Kicherer, dev@kicherer.org"); +MODULE_DESCRIPTION("Behringer BCD2000 driver"); +MODULE_LICENSE("GPL");
This patch adds initial support for the Behringer BCD2000 USB DJ controller. At the moment, only the MIDI part of the device is working, i.e. knobs, buttons and LEDs. I also plan to add support for the audio part, but I assume that this will require more effort than the rather simple MIDI interface. Progress can be tracked at https://github.com/anyc/snd-usb-bcd2000. Signed-off-by: Mario Kicherer <dev@kicherer.org> --- Changes since v8: - module_usb_driver() macro for module initialization - improved some comments Changes since v7: - replaced snd_card_create with snd_card_new Changes since v6: - applied more style improvements Changes since v5: - use kernel bitmap functions for devices_used Changes since v4: - devices_used as array to support arbitrary number of SNDRV_CARDS - removed unused array "enable" Changes since v3: - applied style and snd_printk changes as suggested by Daniel Mack Changes since v2: - applied more changes from Daniel Mack and Clemens Ladisch Changes since v1: - fixed the various code style issues, thanks to Daniel Mack and checkpatch.pl. sound/usb/Kconfig | 13 ++ sound/usb/Makefile | 2 +- sound/usb/bcd2000/Makefile | 3 + sound/usb/bcd2000/bcd2000.c | 461 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 478 insertions(+), 1 deletion(-) create mode 100644 sound/usb/bcd2000/Makefile create mode 100644 sound/usb/bcd2000/bcd2000.c