4 files changed, 478 insertions, 1 deletions

diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig
index e05a86b7c0da..d393153c474f 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 abe668f660d1..2b92f0dcbc4c 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 000000000000..f09ccc0af6ff
--- /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 000000000000..820d6ca8c458
--- /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");