Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: (250 commits)
  ALSA: hda: Storage class should be before const qualifier
  ASoC: tpa6130a2: Remove CPVSS and HPVdd supplies
  ASoC: tpa6130a2: Define output pins with SND_SOC_DAPM_OUTPUT
  ASoC: sdp4430 - add sdp4430 pcm ops to DAI.
  ASoC: TWL6040: Enable earphone path in codec
  ASoC: SDP4430: Add support for Earphone speaker
  ASoC: SDP4430: Add sdp4430 machine driver
  ASoC: tlv320dac33: Avoid powering off while in BIAS_OFF
  ASoC: tlv320dac33: Use dev_dbg in dac33_hard_power function
  ALSA: sound/pci/asihpi: Use kzalloc
  ALSA: hdmi - dont fail on extra nodes
  ALSA: intelhdmi - add id for the CougarPoint chipset
  ALSA: intelhdmi - user friendly codec name
  ALSA: intelhdmi - add dependency on SND_DYNAMIC_MINORS
  ALSA: asihpi: incorrect range check
  ALSA: asihpi: testing the wrong variable
  ALSA: es1688: add pedantic range checks
  ARM: McBSP: Add support for omap4 in McBSP driver
  ARM: McBSP: Fix request for irq in OMAP4
  OMAP: McBSP: Add 32-bit mode support
  ...

2 files changed, 1390 insertions, 0 deletions

diff --git a/sound/usb/misc/Makefile b/sound/usb/misc/Makefile
new file mode 100644
index 000000000000..ccefd8158936
--- /dev/null
+++ b/sound/usb/misc/Makefile
@@ -0,0 +1,2 @@
+snd-ua101-objs := ua101.o
+obj-$(CONFIG_SND_USB_UA101) += snd-ua101.o
diff --git a/sound/usb/misc/ua101.c b/sound/usb/misc/ua101.c
new file mode 100644
index 000000000000..796d8b25ee89
--- /dev/null
+++ b/sound/usb/misc/ua101.c
@@ -0,0 +1,1388 @@
+/*
+ * Edirol UA-101/UA-1000 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 <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include "../usbaudio.h"
+#include "../midi.h"
+
+MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101},{Edirol,UA-1000}}");
+
+/*
+ * 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;
+};
+
+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);
+
+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);
+
+        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_lib_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_lib_alloc_vmalloc_buffer(substream,
+                                                params_buffer_bytes(hw_params));
+}
+
+static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+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_lib_get_vmalloc_page,
+        .mmap = snd_pcm_lib_mmap_vmalloc,
+};
+
+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_lib_get_vmalloc_page,
+        .mmap = snd_pcm_lib_mmap_vmalloc,
+};
+
+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
+        };
+        static const int intf_numbers[2][3] = {
+                {       /* UA-101 */
+                        [INTF_PLAYBACK] = 0,
+                        [INTF_CAPTURE] = 1,
+                        [INTF_MIDI] = 2,
+                },
+                {       /* UA-1000 */
+                        [INTF_CAPTURE] = 1,
+                        [INTF_PLAYBACK] = 2,
+                        [INTF_MIDI] = 3,
+                },
+        };
+        struct snd_card *card;
+        struct ua101 *ua;
+        unsigned int card_index, i;
+        int is_ua1000;
+        const char *name;
+        char usb_path[32];
+        int err;
+
+        is_ua1000 = usb_id->idProduct == 0x0044;
+
+        if (interface->altsetting->desc.bInterfaceNumber !=
+            intf_numbers[is_ua1000][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);
+
+        ua->intf[0] = interface;
+        for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
+                ua->intf[i] = usb_ifnum_to_if(ua->dev,
+                                              intf_numbers[is_ua1000][i]);
+                if (!ua->intf[i]) {
+                        dev_err(&ua->dev->dev, "interface %u not found\n",
+                                intf_numbers[is_ua1000][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;
+                }
+        }
+
+        snd_card_set_dev(card, &interface->dev);
+
+        err = detect_usb_format(ua);
+        if (err < 0)
+                goto probe_error;
+
+        name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
+        strcpy(card->driver, "UA-101");
+        strcpy(card->shortname, name);
+        usb_make_path(ua->dev, usb_path, sizeof(usb_path));
+        snprintf(ua->card->longname, sizeof(ua->card->longname),
+                 "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
+                 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, name, 0, 1, 1, &ua->pcm);
+        if (err < 0)
+                goto probe_error;
+        ua->pcm->private_data = ua;
+        strcpy(ua->pcm->name, name);
+        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);
+
+        err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
+                                 &ua->midi_list, &midi_quirk);
+        if (err < 0)
+                goto probe_error;
+
+        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[] = {
+        { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
+        { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
+        { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
+        { }
+};
+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);