sound: add Edirol UA-101 support
Clemens Ladisch [Mon, 14 Dec 2009 11:48:35 +0000 (12:48 +0100)]
Add experimental support for the Edirol UA-101 audio/MIDI interface.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Documentation/sound/alsa/ALSA-Configuration.txt
sound/usb/Kconfig
sound/usb/Makefile
sound/usb/ua101.c [new file with mode: 0644]
sound/usb/usbaudio.c
sound/usb/usbaudio.h
sound/usb/usbquirks.h

index 8923597..7a0a4a9 100644 (file)
@@ -1791,6 +1791,13 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
     The power-management is supported.
 
+  Module snd-ua101
+  ----------------
+
+    Module for the Edirol UA-101 audio/MIDI interface.
+
+    This module supports multiple devices, autoprobe and hotplugging.
+
   Module snd-usb-audio
   --------------------
 
index 73525c0..8c29258 100644 (file)
@@ -21,6 +21,18 @@ config SND_USB_AUDIO
          To compile this driver as a module, choose M here: the module
          will be called snd-usb-audio.
 
+config SND_USB_UA101
+       tristate "Edirol UA-101 driver (EXPERIMENTAL)"
+       depends on EXPERIMENTAL
+       select SND_PCM
+       select SND_RAWMIDI
+       help
+         Say Y here to include support for the Edirol UA-101 audio/MIDI
+         interface.
+
+         To compile this driver as a module, choose M here: the module
+         will be called snd-ua101.
+
 config SND_USB_USX2Y
        tristate "Tascam US-122, US-224 and US-428 USB driver"
        depends on X86 || PPC || ALPHA
index abb288b..5bf64ae 100644 (file)
@@ -4,9 +4,11 @@
 
 snd-usb-audio-objs := usbaudio.o usbmixer.o
 snd-usb-lib-objs := usbmidi.o
+snd-ua101-objs := ua101.o
 
 # Toplevel Module Dependency
 obj-$(CONFIG_SND_USB_AUDIO) += snd-usb-audio.o snd-usb-lib.o
+obj-$(CONFIG_SND_USB_UA101) += snd-ua101.o snd-usb-lib.o
 obj-$(CONFIG_SND_USB_USX2Y) += snd-usb-lib.o
 obj-$(CONFIG_SND_USB_US122L) += snd-usb-lib.o
 
diff --git a/sound/usb/ua101.c b/sound/usb/ua101.c
new file mode 100644 (file)
index 0000000..ab9f8a2
--- /dev/null
@@ -0,0 +1,1457 @@
+/*
+ * Edirol UA-101 driver
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ *
+ * This driver is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2.
+ *
+ * This driver 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 driver.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/usb/audio.h>
+#include <linux/vmalloc.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include "usbaudio.h"
+
+MODULE_DESCRIPTION("Edirol UA-101 driver");
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101}}");
+
+/* I use my UA-1A for testing because I don't have a UA-101 ... */
+#define UA1A_HACK
+
+/*
+ * Should not be lower than the minimum scheduling delay of the host
+ * controller.  Some Intel controllers need more than one frame; as long as
+ * that driver doesn't tell us about this, use 1.5 frames just to be sure.
+ */
+#define MIN_QUEUE_LENGTH       12
+/* Somewhat random. */
+#define MAX_QUEUE_LENGTH       30
+/*
+ * This magic value optimizes memory usage efficiency for the UA-101's packet
+ * sizes at all sample rates, taking into account the stupid cache pool sizes
+ * that usb_buffer_alloc() uses.
+ */
+#define DEFAULT_QUEUE_LENGTH   21
+
+#define MAX_PACKET_SIZE                672 /* hardware specific */
+#define MAX_MEMORY_BUFFERS     DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
+                                            PAGE_SIZE / MAX_PACKET_SIZE)
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
+static unsigned int queue_length = 21;
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "card index");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "enable card");
+module_param(queue_length, uint, 0644);
+MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
+                __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
+
+enum {
+       INTF_PLAYBACK,
+       INTF_CAPTURE,
+       INTF_MIDI,
+
+       INTF_COUNT
+};
+
+/* bits in struct ua101::states */
+enum {
+       USB_CAPTURE_RUNNING,
+       USB_PLAYBACK_RUNNING,
+       ALSA_CAPTURE_OPEN,
+       ALSA_PLAYBACK_OPEN,
+       ALSA_CAPTURE_RUNNING,
+       ALSA_PLAYBACK_RUNNING,
+       CAPTURE_URB_COMPLETED,
+       PLAYBACK_URB_COMPLETED,
+       DISCONNECTED,
+};
+
+struct ua101 {
+       struct usb_device *dev;
+       struct snd_card *card;
+       struct usb_interface *intf[INTF_COUNT];
+       int card_index;
+       struct snd_pcm *pcm;
+       struct list_head midi_list;
+       u64 format_bit;
+       unsigned int rate;
+       unsigned int packets_per_second;
+       spinlock_t lock;
+       struct mutex mutex;
+       unsigned long states;
+
+       /* FIFO to synchronize playback rate to capture rate */
+       unsigned int rate_feedback_start;
+       unsigned int rate_feedback_count;
+       u8 rate_feedback[MAX_QUEUE_LENGTH];
+
+       struct list_head ready_playback_urbs;
+       struct tasklet_struct playback_tasklet;
+       wait_queue_head_t alsa_capture_wait;
+       wait_queue_head_t rate_feedback_wait;
+       wait_queue_head_t alsa_playback_wait;
+       struct ua101_stream {
+               struct snd_pcm_substream *substream;
+               unsigned int usb_pipe;
+               unsigned int channels;
+               unsigned int frame_bytes;
+               unsigned int max_packet_bytes;
+               unsigned int period_pos;
+               unsigned int buffer_pos;
+               unsigned int queue_length;
+               struct ua101_urb {
+                       struct urb urb;
+                       struct usb_iso_packet_descriptor iso_frame_desc[1];
+                       struct list_head ready_list;
+               } *urbs[MAX_QUEUE_LENGTH];
+               struct {
+                       unsigned int size;
+                       void *addr;
+                       dma_addr_t dma;
+               } buffers[MAX_MEMORY_BUFFERS];
+       } capture, playback;
+
+       unsigned int fps[10];
+       unsigned int frame_counter;
+};
+
+static DEFINE_MUTEX(devices_mutex);
+static unsigned int devices_used;
+static struct usb_driver ua101_driver;
+
+static void abort_alsa_playback(struct ua101 *ua);
+static void abort_alsa_capture(struct ua101 *ua);
+
+/* allocate virtual buffer; may be called more than once */
+static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
+                                       size_t size)
+{
+       struct snd_pcm_runtime *runtime = subs->runtime;
+
+       if (runtime->dma_area) {
+               if (runtime->dma_bytes >= size)
+                       return 0; /* already large enough */
+               vfree(runtime->dma_area);
+       }
+       runtime->dma_area = vmalloc_user(size);
+       if (!runtime->dma_area)
+               return -ENOMEM;
+       runtime->dma_bytes = size;
+       return 0;
+}
+
+/* free virtual buffer; may be called more than once */
+static int snd_pcm_free_vmalloc_buffer(struct snd_pcm_substream *subs)
+{
+       struct snd_pcm_runtime *runtime = subs->runtime;
+
+       vfree(runtime->dma_area);
+       runtime->dma_area = NULL;
+       return 0;
+}
+
+/* get the physical page pointer at the given offset */
+static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
+                                            unsigned long offset)
+{
+       void *pageptr = subs->runtime->dma_area + offset;
+       return vmalloc_to_page(pageptr);
+}
+
+static const char *usb_error_string(int err)
+{
+       switch (err) {
+       case -ENODEV:
+               return "no device";
+       case -ENOENT:
+               return "endpoint not enabled";
+       case -EPIPE:
+               return "endpoint stalled";
+       case -ENOSPC:
+               return "not enough bandwidth";
+       case -ESHUTDOWN:
+               return "device disabled";
+       case -EHOSTUNREACH:
+               return "device suspended";
+       case -EINVAL:
+       case -EAGAIN:
+       case -EFBIG:
+       case -EMSGSIZE:
+               return "internal error";
+       default:
+               return "unknown error";
+       }
+}
+
+static void abort_usb_capture(struct ua101 *ua)
+{
+       if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
+               wake_up(&ua->alsa_capture_wait);
+               wake_up(&ua->rate_feedback_wait);
+       }
+}
+
+static void abort_usb_playback(struct ua101 *ua)
+{
+       if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
+               wake_up(&ua->alsa_playback_wait);
+}
+
+static void playback_urb_complete(struct urb *usb_urb)
+{
+       struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
+       struct ua101 *ua = urb->urb.context;
+       unsigned long flags;
+
+       if (unlikely(urb->urb.status == -ENOENT ||      /* unlinked */
+                    urb->urb.status == -ENODEV ||      /* device removed */
+                    urb->urb.status == -ECONNRESET ||  /* unlinked */
+                    urb->urb.status == -ESHUTDOWN)) {  /* device disabled */
+               abort_usb_playback(ua);
+               abort_alsa_playback(ua);
+               return;
+       }
+
+       if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
+               /* append URB to FIFO */
+               spin_lock_irqsave(&ua->lock, flags);
+               list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
+               if (ua->rate_feedback_count > 0)
+                       tasklet_schedule(&ua->playback_tasklet);
+               ua->playback.substream->runtime->delay -=
+                               urb->urb.iso_frame_desc[0].length /
+                                               ua->playback.frame_bytes;
+               spin_unlock_irqrestore(&ua->lock, flags);
+       }
+}
+
+static void first_playback_urb_complete(struct urb *urb)
+{
+       struct ua101 *ua = urb->context;
+
+       urb->complete = playback_urb_complete;
+       playback_urb_complete(urb);
+
+       set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
+       wake_up(&ua->alsa_playback_wait);
+}
+
+/* copy data from the ALSA ring buffer into the URB buffer */
+static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
+                              unsigned int frames)
+{
+       struct snd_pcm_runtime *runtime;
+       unsigned int frame_bytes, frames1;
+       const u8 *source;
+
+       runtime = stream->substream->runtime;
+       frame_bytes = stream->frame_bytes;
+       source = runtime->dma_area + stream->buffer_pos * frame_bytes;
+       if (stream->buffer_pos + frames <= runtime->buffer_size) {
+               memcpy(urb->transfer_buffer, source, frames * frame_bytes);
+       } else {
+               /* wrap around at end of ring buffer */
+               frames1 = runtime->buffer_size - stream->buffer_pos;
+               memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
+               memcpy(urb->transfer_buffer + frames1 * frame_bytes,
+                      runtime->dma_area, (frames - frames1) * frame_bytes);
+       }
+
+       stream->buffer_pos += frames;
+       if (stream->buffer_pos >= runtime->buffer_size)
+               stream->buffer_pos -= runtime->buffer_size;
+       stream->period_pos += frames;
+       if (stream->period_pos >= runtime->period_size) {
+               stream->period_pos -= runtime->period_size;
+               return true;
+       }
+       return false;
+}
+
+static inline void add_with_wraparound(struct ua101 *ua,
+                                      unsigned int *value, unsigned int add)
+{
+       *value += add;
+       if (*value >= ua->playback.queue_length)
+               *value -= ua->playback.queue_length;
+}
+
+static void playback_tasklet(unsigned long data)
+{
+       struct ua101 *ua = (void *)data;
+       unsigned long flags;
+       unsigned int frames;
+       struct ua101_urb *urb;
+       bool do_period_elapsed = false;
+       int err;
+
+       if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
+               return;
+
+       /*
+        * Synchronizing the playback rate to the capture rate is done by using
+        * the same sequence of packet sizes for both streams.
+        * Submitting a playback URB therefore requires both a ready URB and
+        * the size of the corresponding capture packet, i.e., both playback
+        * and capture URBs must have been completed.  Since the USB core does
+        * not guarantee that playback and capture complete callbacks are
+        * called alternately, we use two FIFOs for packet sizes and read URBs;
+        * submitting playback URBs is possible as long as both FIFOs are
+        * nonempty.
+        */
+       spin_lock_irqsave(&ua->lock, flags);
+       while (ua->rate_feedback_count > 0 &&
+              !list_empty(&ua->ready_playback_urbs)) {
+               /* take packet size out of FIFO */
+               frames = ua->rate_feedback[ua->rate_feedback_start];
+               add_with_wraparound(ua, &ua->rate_feedback_start, 1);
+               ua->rate_feedback_count--;
+
+               /* take URB out of FIFO */
+               urb = list_first_entry(&ua->ready_playback_urbs,
+                                      struct ua101_urb, ready_list);
+               list_del(&urb->ready_list);
+
+               /* fill packet with data or silence */
+               urb->urb.iso_frame_desc[0].length =
+                       frames * ua->playback.frame_bytes;
+               if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
+                       do_period_elapsed |= copy_playback_data(&ua->playback,
+                                                               &urb->urb,
+                                                               frames);
+               else
+                       memset(urb->urb.transfer_buffer, 0,
+                              urb->urb.iso_frame_desc[0].length);
+
+               /* and off you go ... */
+               err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
+               if (unlikely(err < 0)) {
+                       spin_unlock_irqrestore(&ua->lock, flags);
+                       abort_usb_playback(ua);
+                       abort_alsa_playback(ua);
+                       dev_err(&ua->dev->dev, "USB request error %d: %s\n",
+                               err, usb_error_string(err));
+                       return;
+               }
+               ua->playback.substream->runtime->delay += frames;
+       }
+       spin_unlock_irqrestore(&ua->lock, flags);
+       if (do_period_elapsed)
+               snd_pcm_period_elapsed(ua->playback.substream);
+}
+
+/* copy data from the URB buffer into the ALSA ring buffer */
+static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
+                             unsigned int frames)
+{
+       struct snd_pcm_runtime *runtime;
+       unsigned int frame_bytes, frames1;
+       u8 *dest;
+
+       runtime = stream->substream->runtime;
+       frame_bytes = stream->frame_bytes;
+       dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
+       if (stream->buffer_pos + frames <= runtime->buffer_size) {
+               memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
+       } else {
+               /* wrap around at end of ring buffer */
+               frames1 = runtime->buffer_size - stream->buffer_pos;
+               memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
+               memcpy(runtime->dma_area,
+                      urb->transfer_buffer + frames1 * frame_bytes,
+                      (frames - frames1) * frame_bytes);
+       }
+
+       stream->buffer_pos += frames;
+       if (stream->buffer_pos >= runtime->buffer_size)
+               stream->buffer_pos -= runtime->buffer_size;
+       stream->period_pos += frames;
+       if (stream->period_pos >= runtime->period_size) {
+               stream->period_pos -= runtime->period_size;
+               return true;
+       }
+       return false;
+}
+
+static void capture_urb_complete(struct urb *urb)
+{
+       struct ua101 *ua = urb->context;
+       struct ua101_stream *stream = &ua->capture;
+       unsigned long flags;
+       unsigned int frames, write_ptr;
+       bool do_period_elapsed;
+       int err;
+
+       if (unlikely(urb->status == -ENOENT ||          /* unlinked */
+                    urb->status == -ENODEV ||          /* device removed */
+                    urb->status == -ECONNRESET ||      /* unlinked */
+                    urb->status == -ESHUTDOWN))        /* device disabled */
+               goto stream_stopped;
+
+       if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
+               frames = urb->iso_frame_desc[0].actual_length /
+                       stream->frame_bytes;
+       else
+               frames = 0;
+
+       spin_lock_irqsave(&ua->lock, flags);
+
+       if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
+               do_period_elapsed = copy_capture_data(stream, urb, frames);
+       else
+               do_period_elapsed = false;
+
+       if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
+               err = usb_submit_urb(urb, GFP_ATOMIC);
+               if (unlikely(err < 0)) {
+                       spin_unlock_irqrestore(&ua->lock, flags);
+                       dev_err(&ua->dev->dev, "USB request error %d: %s\n",
+                               err, usb_error_string(err));
+                       goto stream_stopped;
+               }
+
+               /* append packet size to FIFO */
+               write_ptr = ua->rate_feedback_start;
+               add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
+               ua->rate_feedback[write_ptr] = frames;
+               if (ua->rate_feedback_count < ua->playback.queue_length) {
+                       ua->rate_feedback_count++;
+                       if (ua->rate_feedback_count ==
+                                               ua->playback.queue_length)
+                               wake_up(&ua->rate_feedback_wait);
+               } else {
+                       /*
+                        * Ring buffer overflow; this happens when the playback
+                        * stream is not running.  Throw away the oldest entry,
+                        * so that the playback stream, when it starts, sees
+                        * the most recent packet sizes.
+                        */
+                       add_with_wraparound(ua, &ua->rate_feedback_start, 1);
+               }
+               if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
+                   !list_empty(&ua->ready_playback_urbs))
+                       tasklet_schedule(&ua->playback_tasklet);
+       }
+
+       spin_unlock_irqrestore(&ua->lock, flags);
+
+       if (do_period_elapsed)
+               snd_pcm_period_elapsed(stream->substream);
+
+       /* for debugging: measure the sample rate relative to the USB clock */
+       ua->fps[ua->frame_counter++ / ua->packets_per_second] += frames;
+       if (ua->frame_counter >= ARRAY_SIZE(ua->fps) * ua->packets_per_second) {
+               printk(KERN_DEBUG "capture rate:");
+               for (frames = 0; frames < ARRAY_SIZE(ua->fps); ++frames)
+                       printk(KERN_CONT " %u", ua->fps[frames]);
+               printk(KERN_CONT "\n");
+               memset(ua->fps, 0, sizeof(ua->fps));
+               ua->frame_counter = 0;
+       }
+       return;
+
+stream_stopped:
+       abort_usb_playback(ua);
+       abort_usb_capture(ua);
+       abort_alsa_playback(ua);
+       abort_alsa_capture(ua);
+}
+
+static void first_capture_urb_complete(struct urb *urb)
+{
+       struct ua101 *ua = urb->context;
+
+       urb->complete = capture_urb_complete;
+       capture_urb_complete(urb);
+
+       set_bit(CAPTURE_URB_COMPLETED, &ua->states);
+       wake_up(&ua->alsa_capture_wait);
+}
+
+static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
+{
+       unsigned int i;
+
+       for (i = 0; i < stream->queue_length; ++i) {
+               int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
+               if (err < 0) {
+                       dev_err(&ua->dev->dev, "USB request error %d: %s\n",
+                               err, usb_error_string(err));
+                       return err;
+               }
+       }
+       return 0;
+}
+
+static void kill_stream_urbs(struct ua101_stream *stream)
+{
+       unsigned int i;
+
+       for (i = 0; i < stream->queue_length; ++i)
+               usb_kill_urb(&stream->urbs[i]->urb);
+}
+
+static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
+{
+       struct usb_host_interface *alts;
+
+       alts = ua->intf[intf_index]->cur_altsetting;
+       if (alts->desc.bAlternateSetting != 1) {
+               int err = usb_set_interface(ua->dev,
+                                           alts->desc.bInterfaceNumber, 1);
+               if (err < 0) {
+                       dev_err(&ua->dev->dev,
+                               "cannot initialize interface; error %d: %s\n",
+                               err, usb_error_string(err));
+                       return err;
+               }
+       }
+       return 0;
+}
+
+static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
+{
+       struct usb_host_interface *alts;
+
+       alts = ua->intf[intf_index]->cur_altsetting;
+       if (alts->desc.bAlternateSetting != 0) {
+               int err = usb_set_interface(ua->dev,
+                                           alts->desc.bInterfaceNumber, 0);
+               if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
+                       dev_warn(&ua->dev->dev,
+                                "interface reset failed; error %d: %s\n",
+                                err, usb_error_string(err));
+       }
+}
+
+static void stop_usb_capture(struct ua101 *ua)
+{
+       clear_bit(USB_CAPTURE_RUNNING, &ua->states);
+
+       kill_stream_urbs(&ua->capture);
+
+       disable_iso_interface(ua, INTF_CAPTURE);
+}
+
+static int start_usb_capture(struct ua101 *ua)
+{
+       int err;
+
+       if (test_bit(DISCONNECTED, &ua->states))
+               return -ENODEV;
+
+       if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
+               return 0;
+
+       kill_stream_urbs(&ua->capture);
+
+       err = enable_iso_interface(ua, INTF_CAPTURE);
+       if (err < 0)
+               return err;
+
+       clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
+       ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
+       ua->rate_feedback_start = 0;
+       ua->rate_feedback_count = 0;
+
+       set_bit(USB_CAPTURE_RUNNING, &ua->states);
+       err = submit_stream_urbs(ua, &ua->capture);
+       if (err < 0)
+               stop_usb_capture(ua);
+       return err;
+}
+
+static void stop_usb_playback(struct ua101 *ua)
+{
+       clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
+
+       kill_stream_urbs(&ua->playback);
+
+       tasklet_kill(&ua->playback_tasklet);
+
+       disable_iso_interface(ua, INTF_PLAYBACK);
+}
+
+static int start_usb_playback(struct ua101 *ua)
+{
+       unsigned int i, frames;
+       struct urb *urb;
+       int err = 0;
+
+       if (test_bit(DISCONNECTED, &ua->states))
+               return -ENODEV;
+
+       if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
+               return 0;
+
+       kill_stream_urbs(&ua->playback);
+       tasklet_kill(&ua->playback_tasklet);
+
+       err = enable_iso_interface(ua, INTF_PLAYBACK);
+       if (err < 0)
+               return err;
+
+       clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
+       ua->playback.urbs[0]->urb.complete =
+               first_playback_urb_complete;
+       spin_lock_irq(&ua->lock);
+       INIT_LIST_HEAD(&ua->ready_playback_urbs);
+       spin_unlock_irq(&ua->lock);
+
+       /*
+        * We submit the initial URBs all at once, so we have to wait for the
+        * packet size FIFO to be full.
+        */
+       wait_event(ua->rate_feedback_wait,
+                  ua->rate_feedback_count >= ua->playback.queue_length ||
+                  !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
+                  test_bit(DISCONNECTED, &ua->states));
+       if (test_bit(DISCONNECTED, &ua->states)) {
+               stop_usb_playback(ua);
+               return -ENODEV;
+       }
+       if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
+               stop_usb_playback(ua);
+               return -EIO;
+       }
+
+       for (i = 0; i < ua->playback.queue_length; ++i) {
+               /* all initial URBs contain silence */
+               spin_lock_irq(&ua->lock);
+               frames = ua->rate_feedback[ua->rate_feedback_start];
+               add_with_wraparound(ua, &ua->rate_feedback_start, 1);
+               ua->rate_feedback_count--;
+               spin_unlock_irq(&ua->lock);
+               urb = &ua->playback.urbs[i]->urb;
+               urb->iso_frame_desc[0].length =
+                       frames * ua->playback.frame_bytes;
+               memset(urb->transfer_buffer, 0,
+                      urb->iso_frame_desc[0].length);
+       }
+
+       set_bit(USB_PLAYBACK_RUNNING, &ua->states);
+       err = submit_stream_urbs(ua, &ua->playback);
+       if (err < 0)
+               stop_usb_playback(ua);
+       return err;
+}
+
+static void abort_alsa_capture(struct ua101 *ua)
+{
+       if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
+               snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
+}
+
+static void abort_alsa_playback(struct ua101 *ua)
+{
+       if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
+               snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
+}
+
+static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
+                        unsigned int channels)
+{
+       int err;
+
+       substream->runtime->hw.info =
+               SNDRV_PCM_INFO_MMAP |
+               SNDRV_PCM_INFO_MMAP_VALID |
+               SNDRV_PCM_INFO_BATCH |
+               SNDRV_PCM_INFO_INTERLEAVED |
+               SNDRV_PCM_INFO_BLOCK_TRANSFER |
+               SNDRV_PCM_INFO_FIFO_IN_FRAMES;
+       substream->runtime->hw.formats = ua->format_bit;
+       substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
+       substream->runtime->hw.rate_min = ua->rate;
+       substream->runtime->hw.rate_max = ua->rate;
+       substream->runtime->hw.channels_min = channels;
+       substream->runtime->hw.channels_max = channels;
+       substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
+       substream->runtime->hw.period_bytes_min = 1;
+       substream->runtime->hw.period_bytes_max = UINT_MAX;
+       substream->runtime->hw.periods_min = 2;
+       substream->runtime->hw.periods_max = UINT_MAX;
+       err = snd_pcm_hw_constraint_minmax(substream->runtime,
+                                          SNDRV_PCM_HW_PARAM_PERIOD_TIME,
+                                          1500000 / ua->packets_per_second,
+                                          8192000);
+       if (err < 0)
+               return err;
+       err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
+       return err;
+}
+
+static int capture_pcm_open(struct snd_pcm_substream *substream)
+{
+       struct ua101 *ua = substream->private_data;
+       int err;
+
+       ua->capture.substream = substream;
+       err = set_stream_hw(ua, substream, ua->capture.channels);
+       if (err < 0)
+               return err;
+       substream->runtime->hw.fifo_size =
+               DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
+       substream->runtime->delay = substream->runtime->hw.fifo_size;
+
+       mutex_lock(&ua->mutex);
+       err = start_usb_capture(ua);
+       if (err >= 0)
+               set_bit(ALSA_CAPTURE_OPEN, &ua->states);
+       mutex_unlock(&ua->mutex);
+       return err;
+}
+
+static int playback_pcm_open(struct snd_pcm_substream *substream)
+{
+       struct ua101 *ua = substream->private_data;
+       int err;
+
+       ua->playback.substream = substream;
+       err = set_stream_hw(ua, substream, ua->playback.channels);
+       if (err < 0)
+               return err;
+       substream->runtime->hw.fifo_size =
+               DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
+                                 ua->packets_per_second);
+
+       mutex_lock(&ua->mutex);
+       err = start_usb_capture(ua);
+       if (err < 0)
+               goto error;
+       err = start_usb_playback(ua);
+       if (err < 0) {
+               if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
+                       stop_usb_capture(ua);
+               goto error;
+       }
+       set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
+error:
+       mutex_unlock(&ua->mutex);
+       return err;
+}
+
+static int capture_pcm_close(struct snd_pcm_substream *substream)
+{
+       struct ua101 *ua = substream->private_data;
+
+       mutex_lock(&ua->mutex);
+       clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
+       if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
+               stop_usb_capture(ua);
+       mutex_unlock(&ua->mutex);
+       return 0;
+}
+
+static int playback_pcm_close(struct snd_pcm_substream *substream)
+{
+       struct ua101 *ua = substream->private_data;
+
+       mutex_lock(&ua->mutex);
+       stop_usb_playback(ua);
+       clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
+       if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
+               stop_usb_capture(ua);
+       mutex_unlock(&ua->mutex);
+       return 0;
+}
+
+static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
+                                struct snd_pcm_hw_params *hw_params)
+{
+       struct ua101 *ua = substream->private_data;
+       int err;
+
+       mutex_lock(&ua->mutex);
+       err = start_usb_capture(ua);
+       mutex_unlock(&ua->mutex);
+       if (err < 0)
+               return err;
+
+       return snd_pcm_alloc_vmalloc_buffer(substream,
+                                           params_buffer_bytes(hw_params));
+}
+
+static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
+                                 struct snd_pcm_hw_params *hw_params)
+{
+       struct ua101 *ua = substream->private_data;
+       int err;
+
+       mutex_lock(&ua->mutex);
+       err = start_usb_capture(ua);
+       if (err >= 0)
+               err = start_usb_playback(ua);
+       mutex_unlock(&ua->mutex);
+       if (err < 0)
+               return err;
+
+       return snd_pcm_alloc_vmalloc_buffer(substream,
+                                           params_buffer_bytes(hw_params));
+}
+
+static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+       snd_pcm_free_vmalloc_buffer(substream);
+       return 0;
+}
+
+static int capture_pcm_prepare(struct snd_pcm_substream *substream)
+{
+       struct ua101 *ua = substream->private_data;
+       int err;
+
+       mutex_lock(&ua->mutex);
+       err = start_usb_capture(ua);
+       mutex_unlock(&ua->mutex);
+       if (err < 0)
+               return err;
+
+       /*
+        * The EHCI driver schedules the first packet of an iso stream at 10 ms
+        * in the future, i.e., no data is actually captured for that long.
+        * Take the wait here so that the stream is known to be actually
+        * running when the start trigger has been called.
+        */
+       wait_event(ua->alsa_capture_wait,
+                  test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
+                  !test_bit(USB_CAPTURE_RUNNING, &ua->states));
+       if (test_bit(DISCONNECTED, &ua->states))
+               return -ENODEV;
+       if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
+               return -EIO;
+
+       ua->capture.period_pos = 0;
+       ua->capture.buffer_pos = 0;
+       return 0;
+}
+
+static int playback_pcm_prepare(struct snd_pcm_substream *substream)
+{
+       struct ua101 *ua = substream->private_data;
+       int err;
+
+       mutex_lock(&ua->mutex);
+       err = start_usb_capture(ua);
+       if (err >= 0)
+               err = start_usb_playback(ua);
+       mutex_unlock(&ua->mutex);
+       if (err < 0)
+               return err;
+
+       /* see the comment in capture_pcm_prepare() */
+       wait_event(ua->alsa_playback_wait,
+                  test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
+                  !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
+       if (test_bit(DISCONNECTED, &ua->states))
+               return -ENODEV;
+       if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
+               return -EIO;
+
+       substream->runtime->delay = 0;
+       ua->playback.period_pos = 0;
+       ua->playback.buffer_pos = 0;
+       return 0;
+}
+
+static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+       struct ua101 *ua = substream->private_data;
+
+       switch (cmd) {
+       case SNDRV_PCM_TRIGGER_START:
+               if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
+                       return -EIO;
+               set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
+               return 0;
+       case SNDRV_PCM_TRIGGER_STOP:
+               clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
+               return 0;
+       default:
+               return -EINVAL;
+       }
+}
+
+static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+       struct ua101 *ua = substream->private_data;
+
+       switch (cmd) {
+       case SNDRV_PCM_TRIGGER_START:
+               if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
+                       return -EIO;
+               set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
+               return 0;
+       case SNDRV_PCM_TRIGGER_STOP:
+               clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
+               return 0;
+       default:
+               return -EINVAL;
+       }
+}
+
+static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
+                                                 struct ua101_stream *stream)
+{
+       unsigned long flags;
+       unsigned int pos;
+
+       spin_lock_irqsave(&ua->lock, flags);
+       pos = stream->buffer_pos;
+       spin_unlock_irqrestore(&ua->lock, flags);
+       return pos;
+}
+
+static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
+{
+       struct ua101 *ua = subs->private_data;
+
+       return ua101_pcm_pointer(ua, &ua->capture);
+}
+
+static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
+{
+       struct ua101 *ua = subs->private_data;
+
+       return ua101_pcm_pointer(ua, &ua->playback);
+}
+
+static struct snd_pcm_ops capture_pcm_ops = {
+       .open = capture_pcm_open,
+       .close = capture_pcm_close,
+       .ioctl = snd_pcm_lib_ioctl,
+       .hw_params = capture_pcm_hw_params,
+       .hw_free = ua101_pcm_hw_free,
+       .prepare = capture_pcm_prepare,
+       .trigger = capture_pcm_trigger,
+       .pointer = capture_pcm_pointer,
+       .page = snd_pcm_get_vmalloc_page,
+};
+
+static struct snd_pcm_ops playback_pcm_ops = {
+       .open = playback_pcm_open,
+       .close = playback_pcm_close,
+       .ioctl = snd_pcm_lib_ioctl,
+       .hw_params = playback_pcm_hw_params,
+       .hw_free = ua101_pcm_hw_free,
+       .prepare = playback_pcm_prepare,
+       .trigger = playback_pcm_trigger,
+       .pointer = playback_pcm_pointer,
+       .page = snd_pcm_get_vmalloc_page,
+};
+
+static const struct uac_format_type_i_discrete_descriptor *
+find_format_descriptor(struct usb_interface *interface)
+{
+       struct usb_host_interface *alt;
+       u8 *extra;
+       int extralen;
+
+       if (interface->num_altsetting != 2) {
+               dev_err(&interface->dev, "invalid num_altsetting\n");
+               return NULL;
+       }
+
+       alt = &interface->altsetting[0];
+       if (alt->desc.bNumEndpoints != 0) {
+               dev_err(&interface->dev, "invalid bNumEndpoints\n");
+               return NULL;
+       }
+
+       alt = &interface->altsetting[1];
+       if (alt->desc.bNumEndpoints != 1) {
+               dev_err(&interface->dev, "invalid bNumEndpoints\n");
+               return NULL;
+       }
+
+       extra = alt->extra;
+       extralen = alt->extralen;
+       while (extralen >= sizeof(struct usb_descriptor_header)) {
+               struct uac_format_type_i_discrete_descriptor *desc;
+
+               desc = (struct uac_format_type_i_discrete_descriptor *)extra;
+               if (desc->bLength > extralen) {
+                       dev_err(&interface->dev, "descriptor overflow\n");
+                       return NULL;
+               }
+               if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
+                   desc->bDescriptorType == USB_DT_CS_INTERFACE &&
+                   desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
+                       if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
+                           desc->bSamFreqType != 1) {
+                               dev_err(&interface->dev,
+                                       "invalid format type\n");
+                               return NULL;
+                       }
+                       return desc;
+               }
+               extralen -= desc->bLength;
+               extra += desc->bLength;
+       }
+       dev_err(&interface->dev, "sample format descriptor not found\n");
+       return NULL;
+}
+
+static int detect_usb_format(struct ua101 *ua)
+{
+       const struct uac_format_type_i_discrete_descriptor *fmt_capture;
+       const struct uac_format_type_i_discrete_descriptor *fmt_playback;
+       const struct usb_endpoint_descriptor *epd;
+       unsigned int rate2;
+
+       fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
+       fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
+       if (!fmt_capture || !fmt_playback)
+               return -ENXIO;
+
+       switch (fmt_capture->bSubframeSize) {
+       case 3:
+               ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
+               break;
+       case 4:
+               ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
+               break;
+       default:
+               dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
+               return -ENXIO;
+       }
+       if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
+               dev_err(&ua->dev->dev,
+                       "playback/capture sample widths do not match\n");
+               return -ENXIO;
+       }
+
+       if (fmt_capture->bBitResolution != 24 ||
+           fmt_playback->bBitResolution != 24) {
+               dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
+               return -ENXIO;
+       }
+
+       ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
+       rate2 = combine_triple(fmt_playback->tSamFreq[0]);
+       if (ua->rate != rate2) {
+               dev_err(&ua->dev->dev,
+                       "playback/capture rates do not match: %u/%u\n",
+                       rate2, ua->rate);
+               return -ENXIO;
+       }
+
+       switch (ua->dev->speed) {
+       case USB_SPEED_FULL:
+               ua->packets_per_second = 1000;
+               break;
+       case USB_SPEED_HIGH:
+               ua->packets_per_second = 8000;
+               break;
+       default:
+               dev_err(&ua->dev->dev, "unknown device speed\n");
+               return -ENXIO;
+       }
+
+       ua->capture.channels = fmt_capture->bNrChannels;
+       ua->playback.channels = fmt_playback->bNrChannels;
+       ua->capture.frame_bytes =
+               fmt_capture->bSubframeSize * ua->capture.channels;
+       ua->playback.frame_bytes =
+               fmt_playback->bSubframeSize * ua->playback.channels;
+
+       epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
+       if (!usb_endpoint_is_isoc_in(epd)) {
+               dev_err(&ua->dev->dev, "invalid capture endpoint\n");
+               return -ENXIO;
+       }
+       ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
+       ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
+
+       epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
+       if (!usb_endpoint_is_isoc_out(epd)) {
+               dev_err(&ua->dev->dev, "invalid playback endpoint\n");
+               return -ENXIO;
+       }
+       ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
+       ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
+       return 0;
+}
+
+static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
+{
+       unsigned int remaining_packets, packets, packets_per_page, i;
+       size_t size;
+
+       stream->queue_length = queue_length;
+       stream->queue_length = max(stream->queue_length,
+                                  (unsigned int)MIN_QUEUE_LENGTH);
+       stream->queue_length = min(stream->queue_length,
+                                  (unsigned int)MAX_QUEUE_LENGTH);
+
+       /*
+        * The cache pool sizes used by usb_buffer_alloc() (128, 512, 2048) are
+        * quite bad when used with the packet sizes of this device (e.g. 280,
+        * 520, 624).  Therefore, we allocate and subdivide entire pages, using
+        * a smaller buffer only for the last chunk.
+        */
+       remaining_packets = stream->queue_length;
+       packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
+       for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
+               packets = min(remaining_packets, packets_per_page);
+               size = packets * stream->max_packet_bytes;
+               stream->buffers[i].addr =
+                       usb_buffer_alloc(ua->dev, size, GFP_KERNEL,
+                                        &stream->buffers[i].dma);
+               if (!stream->buffers[i].addr)
+                       return -ENOMEM;
+               stream->buffers[i].size = size;
+               remaining_packets -= packets;
+               if (!remaining_packets)
+                       break;
+       }
+       if (remaining_packets) {
+               dev_err(&ua->dev->dev, "too many packets\n");
+               return -ENXIO;
+       }
+       return 0;
+}
+
+static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
+{
+       unsigned int i;
+
+       for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
+               usb_buffer_free(ua->dev,
+                               stream->buffers[i].size,
+                               stream->buffers[i].addr,
+                               stream->buffers[i].dma);
+}
+
+static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
+                            void (*urb_complete)(struct urb *))
+{
+       unsigned max_packet_size = stream->max_packet_bytes;
+       struct ua101_urb *urb;
+       unsigned int b, u = 0;
+
+       for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
+               unsigned int size = stream->buffers[b].size;
+               u8 *addr = stream->buffers[b].addr;
+               dma_addr_t dma = stream->buffers[b].dma;
+
+               while (size >= max_packet_size) {
+                       if (u >= stream->queue_length)
+                               goto bufsize_error;
+                       urb = kmalloc(sizeof(*urb), GFP_KERNEL);
+                       if (!urb)
+                               return -ENOMEM;
+                       usb_init_urb(&urb->urb);
+                       urb->urb.dev = ua->dev;
+                       urb->urb.pipe = stream->usb_pipe;
+                       urb->urb.transfer_flags = URB_ISO_ASAP |
+                                       URB_NO_TRANSFER_DMA_MAP;
+                       urb->urb.transfer_buffer = addr;
+                       urb->urb.transfer_dma = dma;
+                       urb->urb.transfer_buffer_length = max_packet_size;
+                       urb->urb.number_of_packets = 1;
+                       urb->urb.interval = 1;
+                       urb->urb.context = ua;
+                       urb->urb.complete = urb_complete;
+                       urb->urb.iso_frame_desc[0].offset = 0;
+                       urb->urb.iso_frame_desc[0].length = max_packet_size;
+                       stream->urbs[u++] = urb;
+                       size -= max_packet_size;
+                       addr += max_packet_size;
+                       dma += max_packet_size;
+               }
+       }
+       if (u == stream->queue_length)
+               return 0;
+bufsize_error:
+       dev_err(&ua->dev->dev, "internal buffer size error\n");
+       return -ENXIO;
+}
+
+static void free_stream_urbs(struct ua101_stream *stream)
+{
+       unsigned int i;
+
+       for (i = 0; i < stream->queue_length; ++i)
+               kfree(stream->urbs[i]);
+}
+
+static void free_usb_related_resources(struct ua101 *ua,
+                                      struct usb_interface *interface)
+{
+       unsigned int i;
+
+       free_stream_urbs(&ua->capture);
+       free_stream_urbs(&ua->playback);
+       free_stream_buffers(ua, &ua->capture);
+       free_stream_buffers(ua, &ua->playback);
+
+       for (i = 0; i < ARRAY_SIZE(ua->intf); ++i)
+               if (ua->intf[i]) {
+                       usb_set_intfdata(ua->intf[i], NULL);
+                       if (ua->intf[i] != interface)
+                               usb_driver_release_interface(&ua101_driver,
+                                                            ua->intf[i]);
+               }
+}
+
+static void ua101_card_free(struct snd_card *card)
+{
+       struct ua101 *ua = card->private_data;
+
+       mutex_destroy(&ua->mutex);
+}
+
+static int ua101_probe(struct usb_interface *interface,
+                      const struct usb_device_id *usb_id)
+{
+       static const struct snd_usb_midi_endpoint_info midi_ep = {
+               .out_cables = 0x0001,
+               .in_cables = 0x0001
+       };
+       static const struct snd_usb_audio_quirk midi_quirk = {
+               .type = QUIRK_MIDI_FIXED_ENDPOINT,
+               .data = &midi_ep
+       };
+       struct snd_card *card;
+       struct ua101 *ua;
+       unsigned int card_index, i;
+       char usb_path[32];
+       int err;
+
+       if (interface->altsetting->desc.bInterfaceNumber != 0)
+               return -ENODEV;
+
+       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(*ua), &card);
+       if (err < 0) {
+               mutex_unlock(&devices_mutex);
+               return err;
+       }
+       card->private_free = ua101_card_free;
+       ua = card->private_data;
+       ua->dev = interface_to_usbdev(interface);
+       ua->card = card;
+       ua->card_index = card_index;
+       INIT_LIST_HEAD(&ua->midi_list);
+       spin_lock_init(&ua->lock);
+       mutex_init(&ua->mutex);
+       INIT_LIST_HEAD(&ua->ready_playback_urbs);
+       tasklet_init(&ua->playback_tasklet,
+                    playback_tasklet, (unsigned long)ua);
+       init_waitqueue_head(&ua->alsa_capture_wait);
+       init_waitqueue_head(&ua->rate_feedback_wait);
+       init_waitqueue_head(&ua->alsa_playback_wait);
+
+#ifdef UA1A_HACK
+       if (ua->dev->descriptor.idProduct == cpu_to_le16(0x0018)) {
+               ua->intf[2] = interface;
+               ua->intf[0] = usb_ifnum_to_if(ua->dev, 1);
+               ua->intf[1] = usb_ifnum_to_if(ua->dev, 2);
+               usb_driver_claim_interface(&ua101_driver, ua->intf[0], ua);
+               usb_driver_claim_interface(&ua101_driver, ua->intf[1], ua);
+       } else {
+#endif
+       ua->intf[0] = interface;
+       for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
+               ua->intf[i] = usb_ifnum_to_if(ua->dev, i);
+               if (!ua->intf[i]) {
+                       dev_err(&ua->dev->dev, "interface %u not found\n", i);
+                       err = -ENXIO;
+                       goto probe_error;
+               }
+               err = usb_driver_claim_interface(&ua101_driver,
+                                                ua->intf[i], ua);
+               if (err < 0) {
+                       ua->intf[i] = NULL;
+                       err = -EBUSY;
+                       goto probe_error;
+               }
+       }
+#ifdef UA1A_HACK
+       }
+#endif
+
+       snd_card_set_dev(card, &interface->dev);
+
+#ifdef UA1A_HACK
+       if (ua->dev->descriptor.idProduct == cpu_to_le16(0x0018)) {
+               ua->format_bit = SNDRV_PCM_FMTBIT_S16_LE;
+               ua->rate = 44100;
+               ua->packets_per_second = 1000;
+               ua->capture.channels = 2;
+               ua->playback.channels = 2;
+               ua->capture.frame_bytes = 4;
+               ua->playback.frame_bytes = 4;
+               ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, 2);
+               ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, 1);
+               ua->capture.max_packet_bytes = 192;
+               ua->playback.max_packet_bytes = 192;
+       } else {
+#endif
+       err = detect_usb_format(ua);
+       if (err < 0)
+               goto probe_error;
+#ifdef UA1A_HACK
+       }
+#endif
+
+       strcpy(card->driver, "UA-101");
+       strcpy(card->shortname, "UA-101");
+       usb_make_path(ua->dev, usb_path, sizeof(usb_path));
+       snprintf(ua->card->longname, sizeof(ua->card->longname),
+                "EDIROL UA-101 (serial %s), %u Hz at %s, %s speed",
+                ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
+                ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
+
+       err = alloc_stream_buffers(ua, &ua->capture);
+       if (err < 0)
+               goto probe_error;
+       err = alloc_stream_buffers(ua, &ua->playback);
+       if (err < 0)
+               goto probe_error;
+
+       err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
+       if (err < 0)
+               goto probe_error;
+       err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
+       if (err < 0)
+               goto probe_error;
+
+       err = snd_pcm_new(card, "UA-101", 0, 1, 1, &ua->pcm);
+       if (err < 0)
+               goto probe_error;
+       ua->pcm->private_data = ua;
+       strcpy(ua->pcm->name, "UA-101");
+       snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
+       snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
+
+#ifdef UA1A_HACK
+       if (ua->dev->descriptor.idProduct != cpu_to_le16(0x0018)) {
+#endif
+       err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
+                                &ua->midi_list, &midi_quirk);
+       if (err < 0)
+               goto probe_error;
+#ifdef UA1A_HACK
+       }
+#endif
+
+       err = snd_card_register(card);
+       if (err < 0)
+               goto probe_error;
+
+       usb_set_intfdata(interface, ua);
+       devices_used |= 1 << card_index;
+
+       mutex_unlock(&devices_mutex);
+       return 0;
+
+probe_error:
+       free_usb_related_resources(ua, interface);
+       snd_card_free(card);
+       mutex_unlock(&devices_mutex);
+       return err;
+}
+
+static void ua101_disconnect(struct usb_interface *interface)
+{
+       struct ua101 *ua = usb_get_intfdata(interface);
+       struct list_head *midi;
+
+       if (!ua)
+               return;
+
+       mutex_lock(&devices_mutex);
+
+       set_bit(DISCONNECTED, &ua->states);
+       wake_up(&ua->rate_feedback_wait);
+
+       /* make sure that userspace cannot create new requests */
+       snd_card_disconnect(ua->card);
+
+       /* make sure that there are no pending USB requests */
+       __list_for_each(midi, &ua->midi_list)
+               snd_usbmidi_disconnect(midi);
+       abort_alsa_playback(ua);
+       abort_alsa_capture(ua);
+       mutex_lock(&ua->mutex);
+       stop_usb_playback(ua);
+       stop_usb_capture(ua);
+       mutex_unlock(&ua->mutex);
+
+       free_usb_related_resources(ua, interface);
+
+       devices_used &= ~(1 << ua->card_index);
+
+       snd_card_free_when_closed(ua->card);
+
+       mutex_unlock(&devices_mutex);
+}
+
+static struct usb_device_id ua101_ids[] = {
+#ifdef UA1A_HACK
+       { USB_DEVICE(0x0582, 0x0018) },
+#endif
+       { USB_DEVICE(0x0582, 0x007d) },
+       { USB_DEVICE(0x0582, 0x008d) },
+       { }
+};
+MODULE_DEVICE_TABLE(usb, ua101_ids);
+
+static struct usb_driver ua101_driver = {
+       .name = "snd-ua101",
+       .id_table = ua101_ids,
+       .probe = ua101_probe,
+       .disconnect = ua101_disconnect,
+#if 0
+       .suspend = ua101_suspend,
+       .resume = ua101_resume,
+#endif
+};
+
+static int __init alsa_card_ua101_init(void)
+{
+       return usb_register(&ua101_driver);
+}
+
+static void __exit alsa_card_ua101_exit(void)
+{
+       usb_deregister(&ua101_driver);
+       mutex_destroy(&devices_mutex);
+}
+
+module_init(alsa_card_ua101_init);
+module_exit(alsa_card_ua101_exit);
index b074a59..f352141 100644 (file)
@@ -3142,59 +3142,6 @@ static int create_ua1000_quirk(struct snd_usb_audio *chip,
        return 0;
 }
 
-/*
- * Create a stream for an Edirol UA-101 interface.
- * Copy, paste and modify from Edirol UA-1000
- */
-static int create_ua101_quirk(struct snd_usb_audio *chip,
-                              struct usb_interface *iface,
-                              const struct snd_usb_audio_quirk *quirk)
-{
-       static const struct audioformat ua101_format = {
-               .format = SNDRV_PCM_FORMAT_S32_LE,
-               .fmt_type = USB_FORMAT_TYPE_I,
-               .altsetting = 1,
-               .altset_idx = 1,
-               .attributes = 0,
-               .rates = SNDRV_PCM_RATE_CONTINUOUS,
-       };
-       struct usb_host_interface *alts;
-       struct usb_interface_descriptor *altsd;
-       struct audioformat *fp;
-       int stream, err;
-
-       if (iface->num_altsetting != 2)
-               return -ENXIO;
-       alts = &iface->altsetting[1];
-       altsd = get_iface_desc(alts);
-       if (alts->extralen != 18 || alts->extra[1] != USB_DT_CS_INTERFACE ||
-           altsd->bNumEndpoints != 1)
-               return -ENXIO;
-
-       fp = kmemdup(&ua101_format, sizeof(*fp), GFP_KERNEL);
-       if (!fp)
-               return -ENOMEM;
-
-       fp->channels = alts->extra[11];
-       fp->iface = altsd->bInterfaceNumber;
-       fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
-       fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
-       fp->datainterval = parse_datainterval(chip, alts);
-       fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
-       fp->rate_max = fp->rate_min = combine_triple(&alts->extra[15]);
-
-       stream = (fp->endpoint & USB_DIR_IN)
-               ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
-       err = add_audio_endpoint(chip, stream, fp);
-       if (err < 0) {
-               kfree(fp);
-               return err;
-       }
-       /* FIXME: playback must be synchronized to capture */
-       usb_set_interface(chip->dev, fp->iface, 0);
-       return 0;
-}
-
 static int snd_usb_create_quirk(struct snd_usb_audio *chip,
                                struct usb_interface *iface,
                                const struct snd_usb_audio_quirk *quirk);
@@ -3406,7 +3353,6 @@ static int snd_usb_create_quirk(struct snd_usb_audio *chip,
                [QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
                [QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
                [QUIRK_AUDIO_EDIROL_UA1000] = create_ua1000_quirk,
-               [QUIRK_AUDIO_EDIROL_UA101] = create_ua101_quirk,
                [QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk
        };
 
index 40ba811..9826337 100644 (file)
@@ -159,7 +159,6 @@ enum quirk_type {
        QUIRK_AUDIO_STANDARD_INTERFACE,
        QUIRK_AUDIO_FIXED_ENDPOINT,
        QUIRK_AUDIO_EDIROL_UA1000,
-       QUIRK_AUDIO_EDIROL_UA101,
        QUIRK_AUDIO_EDIROL_UAXX,
 
        QUIRK_TYPE_COUNT
index a892bda..bd6706c 100644 (file)
@@ -1266,37 +1266,6 @@ YAMAHA_DEVICE(0x7010, "UB99"),
                }
        }
 },
-/* Roland UA-101 in High-Speed Mode only */
-{
-       USB_DEVICE(0x0582, 0x007d),
-       .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
-               .vendor_name = "Roland",
-               .product_name = "UA-101",
-               .ifnum = QUIRK_ANY_INTERFACE,
-               .type = QUIRK_COMPOSITE,
-               .data = (const struct snd_usb_audio_quirk[]) {
-                       {
-                               .ifnum = 0,
-                               .type = QUIRK_AUDIO_EDIROL_UA101
-                       },
-                       {
-                               .ifnum = 1,
-                               .type = QUIRK_AUDIO_EDIROL_UA101
-                       },
-                       {
-                               .ifnum = 2,
-                               .type = QUIRK_MIDI_FIXED_ENDPOINT,
-                               .data = & (const struct snd_usb_midi_endpoint_info) {
-                                       .out_cables = 0x0001,
-                                       .in_cables  = 0x0001
-                               }
-                       },
-                       {
-                               .ifnum = -1
-                       }
-               }
-       }
-},
 {
        /* has ID 0x0081 when not in "Advanced Driver" mode */
        USB_DEVICE(0x0582, 0x0080),