ALSA: MIDI driver for Behringer BCD2000 USB device (b47a2229) · Commits · 戴 / test

sound/usb/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -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

sound/usb/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -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/

sound/usb/bcd2000/Makefile

0 → 100644

+3 −0

Original line number	Diff line number	Diff line
		snd-bcd2000-y := bcd2000.o

		obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o
		No newline at end of file

sound/usb/bcd2000/bcd2000.c

0 → 100644

+461 −0

Original line number	Diff line number	Diff line
		/*
		* 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");

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