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 --- sound/usb/Kconfig | 14 + sound/usb/Makefile | 2 +- sound/usb/bcd2000/Makefile | 3 + sound/usb/bcd2000/bcd2000.c | 629 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 647 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 de9408b..50af405 100644 --- a/sound/usb/Kconfig +++ b/sound/usb/Kconfig @@ -146,5 +146,19 @@ config SND_USB_HIFACE To compile this driver as a module, choose M here: the module will be called snd-usb-hiface.

+config SND_USB_BCD2000 + tristate "Behringer BCD2000 MIDI driver" + select SND_HWDEP + 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-usb-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..6540136 --- /dev/null +++ b/sound/usb/bcd2000/Makefile @@ -0,0 +1,3 @@ +snd-usb-bcd2000-y := bcd2000.o + +obj-$(CONFIG_SND_USB_BCD2000) += snd-usb-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..100c39f --- /dev/null +++ b/sound/usb/bcd2000/bcd2000.c @@ -0,0 +1,629 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifdef CONFIG_USB_DEBUG +#define DEBUG 1 +#else +#define DEBUG 0 +#endif +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/usb/audio.h> +#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/rawmidi.h> +#include "../usbaudio.h" +#include "../midi.h" + +#define DEVICE_NAME "Behringer BCD2000" +#define DEVICE_SHORTNAME "bcd2000" + +#define PREFIX DEVICE_SHORTNAME ": " +#define BUFSIZE 64 + +static struct usb_device_id id_table [] = { + { USB_DEVICE(0x1397, 0x00bd) }, + { }, +}; +MODULE_DEVICE_TABLE (usb, id_table); +MODULE_AUTHOR("Mario Kicherer, dev@kicherer.org"); +MODULE_DESCRIPTION("Behringer BCD2000 driver"); +MODULE_LICENSE("GPL"); + +static int debug = 0; +module_param(debug, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "enable debug output (default: 0)"); + +static unsigned char set_led_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; + struct snd_pcm *pcm; + struct list_head midi_list; + spinlock_t lock; + struct mutex mutex; + + 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]; + + unsigned char midi_cmd_buf[3]; + unsigned char midi_cmd_offset; + + struct urb * midi_out_urb; + struct urb * midi_in_urb; +}; + +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; +static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; + +static DEFINE_MUTEX(devices_mutex); +static unsigned int devices_used; +static struct usb_driver bcd2000_driver; + + + + + + +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; +} + +static void bcd2000_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) +{ + struct bcd2000 *bcd2k = substream->rmidi->private_data; + + if (!bcd2k) + return; + + bcd2k->midi_receive_substream = up ? substream : NULL; +} + +static void bcd2000_midi_handle_input(struct bcd2000 *bcd2k, + const unsigned char *buf, int len) +{ + unsigned char length, cmd, buf_offset, tocopy; + int ret; + + if (!bcd2k->midi_receive_substream) + return; + + if (DEBUG || debug) { + printk(KERN_DEBUG PREFIX "received (%d bytes): ", len); + for (ret=0; ret < len; ret++) { + printk("%x ", buf[ret]); + } + printk("\n"); + } + + if (len < 2) + return; + + /* + * The BCD2000 sends MIDI commands with 2 or 3 bytes length. In case of + * 2 bytes, the command is the same as before. + * + * Packet structure: mm nn oo (pp) + * mm: payload length + * nn: MIDI command or note + * oo: note or velocity + * pp: velocity + */ + + length = buf[0]; + + /* ignore packets without payload, should not happen */ + if (length == 0) + return; + + /* + * The MIDI packets the BCD2000 sends can be arbitrarily truncated or + * concatenated. Therefore, this loop accumulates the bytes from the + * input buffer until a full valid MIDI packet is in the MIDI command + * buffer "midi_cmd_buf". + */ + + buf_offset = 1; + while (buf_offset <= length) { + cmd = buf[buf_offset]; + + if (bcd2k->midi_cmd_offset == 0 && cmd != 0x90 && cmd != 0xb0) { + /* + * this is a 2-byte midi packet -> reuse command byte from + * last midi packet + */ + bcd2k->midi_cmd_offset = 1; + } + + /* determine the number of bytes we want to copy this time */ + tocopy = min( 3 - bcd2k->midi_cmd_offset, length - (buf_offset - 1)); + + if (tocopy > 0) { + memcpy(&bcd2k->midi_cmd_buf[bcd2k->midi_cmd_offset], + &buf[buf_offset], tocopy); + } else + printk(KERN_ERR PREFIX "error parsing\n"); + + bcd2k->midi_cmd_offset += tocopy; + buf_offset += tocopy; + + /* is our MIDI packet complete? */ + if (bcd2k->midi_cmd_offset == 3) { + if (DEBUG || debug) { + printk(KERN_DEBUG PREFIX "send midi packet (%d bytes): ", + bcd2k->midi_cmd_offset); + for (ret=0;ret< bcd2k->midi_cmd_offset;ret++) { + printk("%x ", bcd2k->midi_cmd_buf[ret]); + } + printk("\n"); + } + + /* send MIDI packet */ + snd_rawmidi_receive(bcd2k->midi_receive_substream, + bcd2k->midi_cmd_buf, 3); + + bcd2k->midi_cmd_offset = 0; + } + } +} + +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_free_urb(bcd2k->midi_out_urb); + bcd2k->midi_out_active = 0; + } + return 0; +} + +static void bcd2000_midi_send(struct bcd2000 *bcd2k, + struct snd_rawmidi_substream *substream) +{ + int len, ret; + + /* copy the "set LED" command bytes */ + memcpy(bcd2k->midi_out_buf, set_led_prefix, sizeof(set_led_prefix)); + + /* get MIDI packet */ + len = snd_rawmidi_transmit(substream, bcd2k->midi_out_buf + 3, BUFSIZE - 3); + + if (len <= 0) + return; + + /* set payload length */ + bcd2k->midi_out_buf[2] = len; + bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; + + if (DEBUG || debug) { + printk(KERN_DEBUG PREFIX "sending: "); + for (ret=0;ret< 3 + len;ret++) { + printk("%x ", bcd2k->midi_out_buf[ret]); + } + printk("\n"); + } + + /* send packet to the BCD2000 */ + ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); + if (ret < 0) { + printk(KERN_ERR PREFIX + "bcd2000_midi_send(%p): usb_submit_urb() failed," + "ret=%d, len=%d: ", substream, ret, len); + switch (ret) { + case -ENOMEM: printk("ENOMEM\n"); break; + case -ENODEV: printk("ENODEV\n"); break; + case -ENXIO: printk("ENXIO\n"); break; + case -EINVAL: printk("EINVAL\n"); break; + case -EAGAIN: printk("EAGAIN\n"); break; + case -EFBIG: printk("EFBIG\n"); break; + case -EPIPE: printk("EPIPE\n"); break; + case -EMSGSIZE: printk("EMSGSIZE\n"); break; + default: printk("\n"); + } + } else { + bcd2k->midi_out_active = 1; + } +} + +static void bcd2000_midi_output_done(struct urb* urb) +{ + struct bcd2000 * bcd2k = urb->context; + + bcd2k->midi_out_active = 0; + if (urb->status != 0) { + printk(KERN_ERR PREFIX "urb status: %d\n", urb->status); + return; + } + + if (!bcd2k->midi_out_substream) + return; + + bcd2000_midi_send(bcd2k, bcd2k->midi_out_substream); +} + +static void bcd2000_command_reply_dispatch(struct urb* urb) +{ + int ret; + struct device *dev = &urb->dev->dev; + struct bcd2000 *bcd2k = urb->context; + + if (urb->status || !bcd2k) { + dev_warn(dev, "received urb->status = %i\n", urb->status); + return; + } + + if (urb->actual_length > 0) + bcd2000_midi_handle_input(bcd2k, urb->transfer_buffer, urb->actual_length); + + bcd2k->midi_in_urb->actual_length = 0; + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC); + if (ret < 0) + dev_err(dev, "unable to submit urb. OOM!?\n"); +} + +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; + if (!bcd2k->midi_out_active) + bcd2000_midi_send(bcd2k, substream); + } else { + bcd2k->midi_out_substream = NULL; + } +} + +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; + + /* 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_ATOMIC); + if (ret < 0) { + printk(KERN_ERR PREFIX + "bcd2000_init_device: usb_submit_urb() failed," + "ret=%d: ", ret); + switch (ret) { + case -ENOMEM: printk("ENOMEM\n"); break; + case -ENODEV: printk("ENODEV\n"); break; + case -ENXIO: printk("ENXIO\n"); break; + case -EINVAL: printk("EINVAL\n"); break; + case -EAGAIN: printk("EAGAIN\n"); break; + case -EFBIG: printk("EFBIG\n"); break; + case -EPIPE: printk("EPIPE\n"); break; + case -EMSGSIZE: printk("EMSGSIZE\n"); break; + default: printk("\n"); + } + } else { + bcd2k->midi_out_active = 1; + } + + /* send empty packet to enable button and controller events */ + bcd2k->midi_in_urb->actual_length = 0; + ret = usb_submit_urb(bcd2k->midi_in_urb, GFP_ATOMIC); +} + +static void 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; + + 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); + + usb_fill_int_urb(bcd2k->midi_in_urb, bcd2k->dev, + usb_rcvbulkpipe(bcd2k->dev, 0x81), + bcd2k->midi_in_buf, BUFSIZE, + bcd2000_command_reply_dispatch, bcd2k, 1); + + usb_fill_int_urb(bcd2k->midi_out_urb, bcd2k->dev, + usb_sndbulkpipe(bcd2k->dev, 0x1), + bcd2k->midi_out_buf, BUFSIZE, + bcd2000_midi_output_done, bcd2k, 1); + + bcd2000_init_device(bcd2k); +} + +static void bcd2000_close_midi(struct bcd2000 * bcd2k) { + usb_free_urb(bcd2k->midi_out_urb); + usb_free_urb(bcd2k->midi_in_urb); +} + + + + + +/* + * general part + */ + +static void bcd2000_free_usb_related_resources(struct bcd2000 *bcd2k, + struct usb_interface *interface) +{ + unsigned int i; + struct usb_interface *intf; + +// mutex_lock(&ua->mutex); +// free_stream_urbs(&ua->capture); +// free_stream_urbs(&ua->playback); +// mutex_unlock(&ua->mutex); +// free_stream_buffers(ua, &ua->capture); +// free_stream_buffers(ua, &ua->playback); + + for (i = 0; i < 1; ++i) { + mutex_lock(&bcd2k->mutex); + intf = bcd2k->intf; + bcd2k->intf = NULL; + mutex_unlock(&bcd2k->mutex); + if (intf) { + usb_set_intfdata(intf, NULL); + if (intf != interface) + usb_driver_release_interface(&bcd2000_driver, + intf); + } + } +} + +static void bcd2000_card_free(struct snd_card *card) +{ +// struct bcd2000 *bcd2k = card->private_data; +// mutex_destroy(&ua->mutex); +} + +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 (enable[card_index] && !(devices_used & (1 << card_index))) + break; + if (card_index >= SNDRV_CARDS) { + mutex_unlock(&devices_mutex); + return -ENOENT; + } + err = snd_card_create(index[card_index], id[card_index], THIS_MODULE, + sizeof(*bcd2k), &card); + if (err < 0) { + mutex_unlock(&devices_mutex); + return err; + } + card->private_free = bcd2000_card_free; + bcd2k = card->private_data; + bcd2k->dev = interface_to_usbdev(interface); + bcd2k->card = card; + bcd2k->card_index = card_index; + INIT_LIST_HEAD(&bcd2k->midi_list); + spin_lock_init(&bcd2k->lock); + mutex_init(&bcd2k->mutex); + +// INIT_LIST_HEAD(&bcd2k->ready_playback_urbs); +// tasklet_init(&bcd2k->playback_tasklet, +// playback_tasklet, (unsigned long)bcd2k); +// init_waitqueue_head(&bcd2k->alsa_capture_wait); +// init_waitqueue_head(&bcd2k->rate_feedback_wait); +// init_waitqueue_head(&bcd2k->alsa_playback_wait); + + bcd2k->intf = interface; + + snd_card_set_dev(card, &interface->dev); + + strcpy(card->driver, DEVICE_NAME); + strcpy(card->shortname, DEVICE_SHORTNAME); + usb_make_path(bcd2k->dev, usb_path, sizeof(usb_path)); + snprintf(bcd2k->card->longname, sizeof(bcd2k->card->longname), + DEVICE_NAME ", at %s, %s speed", + usb_path, + bcd2k->dev->speed == USB_SPEED_HIGH ? "high" : "full"); + + printk(KERN_INFO PREFIX "%s", bcd2k->card->longname); + +// err = alloc_stream_buffers(bcd2k, &bcd2k->capture); +// if (err < 0) +// goto probe_error; +// err = alloc_stream_buffers(bcd2k, &bcd2k->playback); +// if (err < 0) +// goto probe_error; +// +// err = alloc_stream_urbs(bcd2k, &bcd2k->capture, capture_urb_complete); +// if (err < 0) +// goto probe_error; +// err = alloc_stream_urbs(bcd2k, &bcd2k->playback, playback_urb_complete); +// if (err < 0) +// goto probe_error; +// +// err = snd_pcm_new(card, "bcd2000", 0, 1, 1, &bcd2k->pcm); +// if (err < 0) +// goto probe_error; +// bcd2k->pcm->private_data = bcd2k; +// strcpy(bcd2k->pcm->name, "bcd2000"); +// snd_pcm_set_ops(bcd2k->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops); +// snd_pcm_set_ops(bcd2k->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops); + +// err = snd_usbmidi_create(card, bcd2k->intf, +// &bcd2k->midi_list, &midi_quirk); +// if (err < 0) +// goto probe_error; + + + + bcd2000_init_midi(bcd2k); + + + err = snd_card_register(card); + if (err < 0) + goto probe_error; + + usb_set_intfdata(interface, bcd2k); + devices_used |= 1 << card_index; + + mutex_unlock(&devices_mutex); + return 0; + +probe_error: + 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); + struct list_head *midi; + + if (!bcd2k) + return; + + bcd2000_close_midi(bcd2k); + + mutex_lock(&devices_mutex); + +// set_bit(DISCONNECTED, &bcd2k->states); +// wake_up(&bcd2k->rate_feedback_wait); + + /* make sure that userspace cannot create new requests */ + snd_card_disconnect(bcd2k->card); + + /* make sure that there are no pending USB requests */ + list_for_each(midi, &bcd2k->midi_list) + snd_usbmidi_disconnect(midi); + +// abort_alsa_playback(bcd2k); +// abort_alsa_capture(bcd2k); +// mutex_lock(&bcd2k->mutex); +// stop_usb_playback(bcd2k); +// stop_usb_capture(bcd2k); +// mutex_unlock(&bcd2k->mutex); + + bcd2000_free_usb_related_resources(bcd2k, interface); + + devices_used &= ~(1 << bcd2k->card_index); + + snd_card_free_when_closed(bcd2k->card); + + mutex_unlock(&devices_mutex); +} + +static struct usb_driver bcd2000_driver = { + .name = DEVICE_SHORTNAME, + .probe = bcd2000_probe, + .disconnect = bcd2000_disconnect, + .id_table = id_table, +}; + +static int __init bcd2000_init(void) +{ + int retval = 0; + + retval = usb_register(&bcd2000_driver); + if (retval) + printk(KERN_INFO "usb_register failed. Error number %d", retval); + return retval; +} + +static void __exit bcd2000_exit(void) +{ + usb_deregister(&bcd2000_driver); +} + +module_init (bcd2000_init); +module_exit (bcd2000_exit);