Logo Search packages:      
Sourcecode: alsa-driver version File versions  Download package

usbusx2yaudio.c

/*
 *   US-X2Y AUDIO
 *   Copyright (c) 2002-2004 by Karsten Wiese
 *
 *   based on
 *
 *   (Tentative) USB Audio Driver for ALSA
 *
 *   Main and PCM part
 *
 *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
 *
 *   Many codes borrowed from audio.c by 
 *        Alan Cox (alan@lxorguk.ukuu.org.uk)
 *        Thomas Sailer (sailer@ife.ee.ethz.ch)
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */


#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "usx2y.h"
#include "usbusx2y.h"

#define USX2Y_NRPACKS 4             /* Default value used for nr of packs per urb.
                                1 to 4 have been tested ok on uhci.
                                To use 3 on ohci, you'd need a patch:
                                look for "0000425-linux-2.6.9-rc4-mm1_ohci-hcd.patch.gz" on
                                "https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000425"
                                .
                                1, 2 and 4 work out of the box on ohci, if I recall correctly.
                                Bigger is safer operation,
                                smaller gives lower latencies.
                              */
#define USX2Y_NRPACKS_VARIABLE y    /* If your system works ok with this module's parameter
                                 nrpacks set to 1, you might as well comment 
                                 this #define out, and thereby produce smaller, faster code.
                                 You'd also set USX2Y_NRPACKS to 1 then.
                              */

#ifdef USX2Y_NRPACKS_VARIABLE
 static int nrpacks = USX2Y_NRPACKS; /* number of packets per urb */
 #define  nr_of_packs() nrpacks
 module_param(nrpacks, int, 0444);
 MODULE_PARM_DESC(nrpacks, "Number of packets per URB.");
#else
 #define nr_of_packs() USX2Y_NRPACKS
#endif


static int usX2Y_urb_capt_retire(struct snd_usX2Y_substream *subs)
{
      struct urb  *urb = subs->completed_urb;
      struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
      unsigned char     *cp;
      int         i, len, lens = 0, hwptr_done = subs->hwptr_done;
      struct usX2Ydev   *usX2Y = subs->usX2Y;

      for (i = 0; i < nr_of_packs(); i++) {
            cp = (unsigned char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
            if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */
                  snd_printk(KERN_ERR "active frame status %i. "
                           "Most propably some hardware problem.\n",
                           urb->iso_frame_desc[i].status);
                  return urb->iso_frame_desc[i].status;
            }
            len = urb->iso_frame_desc[i].actual_length / usX2Y->stride;
            if (! len) {
                  snd_printd("0 == len ERROR!\n");
                  continue;
            }

            /* copy a data chunk */
            if ((hwptr_done + len) > runtime->buffer_size) {
                  int cnt = runtime->buffer_size - hwptr_done;
                  int blen = cnt * usX2Y->stride;
                  memcpy(runtime->dma_area + hwptr_done * usX2Y->stride, cp, blen);
                  memcpy(runtime->dma_area, cp + blen, len * usX2Y->stride - blen);
            } else {
                  memcpy(runtime->dma_area + hwptr_done * usX2Y->stride, cp,
                         len * usX2Y->stride);
            }
            lens += len;
            if ((hwptr_done += len) >= runtime->buffer_size)
                  hwptr_done -= runtime->buffer_size;
      }

      subs->hwptr_done = hwptr_done;
      subs->transfer_done += lens;
      /* update the pointer, call callback if necessary */
      if (subs->transfer_done >= runtime->period_size) {
            subs->transfer_done -= runtime->period_size;
            snd_pcm_period_elapsed(subs->pcm_substream);
      }
      return 0;
}
/*
 * prepare urb for playback data pipe
 *
 * we copy the data directly from the pcm buffer.
 * the current position to be copied is held in hwptr field.
 * since a urb can handle only a single linear buffer, if the total
 * transferred area overflows the buffer boundary, we cannot send
 * it directly from the buffer.  thus the data is once copied to
 * a temporary buffer and urb points to that.
 */
static int usX2Y_urb_play_prepare(struct snd_usX2Y_substream *subs,
                          struct urb *cap_urb,
                          struct urb *urb)
{
      int count, counts, pack;
      struct usX2Ydev *usX2Y = subs->usX2Y;
      struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;

      count = 0;
      for (pack = 0; pack <  nr_of_packs(); pack++) {
            /* calculate the size of a packet */
            counts = cap_urb->iso_frame_desc[pack].actual_length / usX2Y->stride;
            count += counts;
            if (counts < 43 || counts > 50) {
                  snd_printk(KERN_ERR "should not be here with counts=%i\n", counts);
                  return -EPIPE;
            }
            /* set up descriptor */
            urb->iso_frame_desc[pack].offset = pack ?
                  urb->iso_frame_desc[pack - 1].offset +
                  urb->iso_frame_desc[pack - 1].length :
                  0;
            urb->iso_frame_desc[pack].length = cap_urb->iso_frame_desc[pack].actual_length;
      }
      if (atomic_read(&subs->state) >= state_PRERUNNING)
            if (subs->hwptr + count > runtime->buffer_size) {
                  /* err, the transferred area goes over buffer boundary.
                   * copy the data to the temp buffer.
                   */
                  int len;
                  len = runtime->buffer_size - subs->hwptr;
                  urb->transfer_buffer = subs->tmpbuf;
                  memcpy(subs->tmpbuf, runtime->dma_area +
                         subs->hwptr * usX2Y->stride, len * usX2Y->stride);
                  memcpy(subs->tmpbuf + len * usX2Y->stride,
                         runtime->dma_area, (count - len) * usX2Y->stride);
                  subs->hwptr += count;
                  subs->hwptr -= runtime->buffer_size;
            } else {
                  /* set the buffer pointer */
                  urb->transfer_buffer = runtime->dma_area + subs->hwptr * usX2Y->stride;
                  if ((subs->hwptr += count) >= runtime->buffer_size)
                  subs->hwptr -= runtime->buffer_size;                  
            }
      else
            urb->transfer_buffer = subs->tmpbuf;
      urb->transfer_buffer_length = count * usX2Y->stride;
      return 0;
}

/*
 * process after playback data complete
 *
 * update the current position and call callback if a period is processed.
 */
static void usX2Y_urb_play_retire(struct snd_usX2Y_substream *subs, struct urb *urb)
{
      struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
      int         len = urb->actual_length / subs->usX2Y->stride;

      subs->transfer_done += len;
      subs->hwptr_done +=  len;
      if (subs->hwptr_done >= runtime->buffer_size)
            subs->hwptr_done -= runtime->buffer_size;
      if (subs->transfer_done >= runtime->period_size) {
            subs->transfer_done -= runtime->period_size;
            snd_pcm_period_elapsed(subs->pcm_substream);
      }
}

static int usX2Y_urb_submit(struct snd_usX2Y_substream *subs, struct urb *urb, int frame)
{
      int err;
      if (!urb)
            return -ENODEV;
      urb->start_frame = (frame + NRURBS * nr_of_packs());  // let hcd do rollover sanity checks
      urb->hcpriv = NULL;
      urb->dev = subs->usX2Y->dev; /* we need to set this at each time */
      if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
            snd_printk(KERN_ERR "usb_submit_urb() returned %i\n", err);
            return err;
      }
      return 0;
}

static inline int usX2Y_usbframe_complete(struct snd_usX2Y_substream *capsubs,
                                struct snd_usX2Y_substream *playbacksubs,
                                int frame)
{
      int err, state;
      struct urb *urb = playbacksubs->completed_urb;

      state = atomic_read(&playbacksubs->state);
      if (NULL != urb) {
            if (state == state_RUNNING)
                  usX2Y_urb_play_retire(playbacksubs, urb);
            else if (state >= state_PRERUNNING)
                  atomic_inc(&playbacksubs->state);
      } else {
            switch (state) {
            case state_STARTING1:
                  urb = playbacksubs->urb[0];
                  atomic_inc(&playbacksubs->state);
                  break;
            case state_STARTING2:
                  urb = playbacksubs->urb[1];
                  atomic_inc(&playbacksubs->state);
                  break;
            }
      }
      if (urb) {
            if ((err = usX2Y_urb_play_prepare(playbacksubs, capsubs->completed_urb, urb)) ||
                (err = usX2Y_urb_submit(playbacksubs, urb, frame))) {
                  return err;
            }
      }

      playbacksubs->completed_urb = NULL;

      state = atomic_read(&capsubs->state);
      if (state >= state_PREPARED) {
            if (state == state_RUNNING) {
                  if ((err = usX2Y_urb_capt_retire(capsubs)))
                        return err;
            } else if (state >= state_PRERUNNING)
                  atomic_inc(&capsubs->state);
            if ((err = usX2Y_urb_submit(capsubs, capsubs->completed_urb, frame)))
                  return err;
      }
      capsubs->completed_urb = NULL;
      return 0;
}


static void usX2Y_clients_stop(struct usX2Ydev *usX2Y)
{
      int s, u;

      for (s = 0; s < 4; s++) {
            struct snd_usX2Y_substream *subs = usX2Y->subs[s];
            if (subs) {
                  snd_printdd("%i %p state=%i\n", s, subs, atomic_read(&subs->state));
                  atomic_set(&subs->state, state_STOPPED);
            }
      }
      for (s = 0; s < 4; s++) {
            struct snd_usX2Y_substream *subs = usX2Y->subs[s];
            if (subs) {
                  if (atomic_read(&subs->state) >= state_PRERUNNING) {
                        snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
                  }
                  for (u = 0; u < NRURBS; u++) {
                        struct urb *urb = subs->urb[u];
                        if (NULL != urb)
                              snd_printdd("%i status=%i start_frame=%i\n",
                                        u, urb->status, urb->start_frame);
                  }
            }
      }
      usX2Y->prepare_subs = NULL;
      wake_up(&usX2Y->prepare_wait_queue);
}

static void usX2Y_error_urb_status(struct usX2Ydev *usX2Y,
                           struct snd_usX2Y_substream *subs, struct urb *urb)
{
      snd_printk(KERN_ERR "ep=%i stalled with status=%i\n", subs->endpoint, urb->status);
      urb->status = 0;
      usX2Y_clients_stop(usX2Y);
}

static void usX2Y_error_sequence(struct usX2Ydev *usX2Y,
                         struct snd_usX2Y_substream *subs, struct urb *urb)
{
      snd_printk(KERN_ERR
"Sequence Error!(hcd_frame=%i ep=%i%s;wait=%i,frame=%i).\n"
"Most propably some urb of usb-frame %i is still missing.\n"
"Cause could be too long delays in usb-hcd interrupt handling.\n",
               usb_get_current_frame_number(usX2Y->dev),
               subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
               usX2Y->wait_iso_frame, urb->start_frame, usX2Y->wait_iso_frame);
      usX2Y_clients_stop(usX2Y);
}

static void i_usX2Y_urb_complete(struct urb *urb)
{
      struct snd_usX2Y_substream *subs = urb->context;
      struct usX2Ydev *usX2Y = subs->usX2Y;

      if (unlikely(atomic_read(&subs->state) < state_PREPARED)) {
            snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n",
                      usb_get_current_frame_number(usX2Y->dev),
                      subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
                      urb->status, urb->start_frame);
            return;
      }
      if (unlikely(urb->status)) {
            usX2Y_error_urb_status(usX2Y, subs, urb);
            return;
      }
      if (likely((urb->start_frame & 0xFFFF) == (usX2Y->wait_iso_frame & 0xFFFF)))
            subs->completed_urb = urb;
      else {
            usX2Y_error_sequence(usX2Y, subs, urb);
            return;
      }
      {
            struct snd_usX2Y_substream *capsubs = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE],
                  *playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
            if (capsubs->completed_urb &&
                atomic_read(&capsubs->state) >= state_PREPARED &&
                (playbacksubs->completed_urb ||
                 atomic_read(&playbacksubs->state) < state_PREPARED)) {
                  if (!usX2Y_usbframe_complete(capsubs, playbacksubs, urb->start_frame))
                        usX2Y->wait_iso_frame += nr_of_packs();
                  else {
                        snd_printdd("\n");
                        usX2Y_clients_stop(usX2Y);
                  }
            }
      }
}

static void usX2Y_urbs_set_complete(struct usX2Ydev * usX2Y,
                            void (*complete)(struct urb *))
{
      int s, u;
      for (s = 0; s < 4; s++) {
            struct snd_usX2Y_substream *subs = usX2Y->subs[s];
            if (NULL != subs)
                  for (u = 0; u < NRURBS; u++) {
                        struct urb * urb = subs->urb[u];
                        if (NULL != urb)
                              urb->complete = complete;
                  }
      }
}

static void usX2Y_subs_startup_finish(struct usX2Ydev * usX2Y)
{
      usX2Y_urbs_set_complete(usX2Y, i_usX2Y_urb_complete);
      usX2Y->prepare_subs = NULL;
}

static void i_usX2Y_subs_startup(struct urb *urb)
{
      struct snd_usX2Y_substream *subs = urb->context;
      struct usX2Ydev *usX2Y = subs->usX2Y;
      struct snd_usX2Y_substream *prepare_subs = usX2Y->prepare_subs;
      if (NULL != prepare_subs)
            if (urb->start_frame == prepare_subs->urb[0]->start_frame) {
                  usX2Y_subs_startup_finish(usX2Y);
                  atomic_inc(&prepare_subs->state);
                  wake_up(&usX2Y->prepare_wait_queue);
            }

      i_usX2Y_urb_complete(urb);
}

static void usX2Y_subs_prepare(struct snd_usX2Y_substream *subs)
{
      snd_printdd("usX2Y_substream_prepare(%p) ep=%i urb0=%p urb1=%p\n",
                subs, subs->endpoint, subs->urb[0], subs->urb[1]);
      /* reset the pointer */
      subs->hwptr = 0;
      subs->hwptr_done = 0;
      subs->transfer_done = 0;
}


static void usX2Y_urb_release(struct urb **urb, int free_tb)
{
      if (*urb) {
            usb_kill_urb(*urb);
            if (free_tb)
                  kfree((*urb)->transfer_buffer);
            usb_free_urb(*urb);
            *urb = NULL;
      }
}
/*
 * release a substreams urbs
 */
static void usX2Y_urbs_release(struct snd_usX2Y_substream *subs)
{
      int i;
      snd_printdd("usX2Y_urbs_release() %i\n", subs->endpoint);
      for (i = 0; i < NRURBS; i++)
            usX2Y_urb_release(subs->urb + i,
                          subs != subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK]);

      kfree(subs->tmpbuf);
      subs->tmpbuf = NULL;
}
/*
 * initialize a substream's urbs
 */
static int usX2Y_urbs_allocate(struct snd_usX2Y_substream *subs)
{
      int i;
      unsigned int pipe;
      int is_playback = subs == subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
      struct usb_device *dev = subs->usX2Y->dev;

      pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
                  usb_rcvisocpipe(dev, subs->endpoint);
      subs->maxpacksize = usb_maxpacket(dev, pipe, is_playback);
      if (!subs->maxpacksize)
            return -EINVAL;

      if (is_playback && NULL == subs->tmpbuf) {      /* allocate a temporary buffer for playback */
            subs->tmpbuf = kcalloc(nr_of_packs(), subs->maxpacksize, GFP_KERNEL);
            if (NULL == subs->tmpbuf) {
                  snd_printk(KERN_ERR "cannot malloc tmpbuf\n");
                  return -ENOMEM;
            }
      }
      /* allocate and initialize data urbs */
      for (i = 0; i < NRURBS; i++) {
            struct urb **purb = subs->urb + i;
            if (*purb) {
                  usb_kill_urb(*purb);
                  continue;
            }
            *purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
            if (NULL == *purb) {
                  usX2Y_urbs_release(subs);
                  return -ENOMEM;
            }
            if (!is_playback && !(*purb)->transfer_buffer) {
                  /* allocate a capture buffer per urb */
                  (*purb)->transfer_buffer = kmalloc(subs->maxpacksize * nr_of_packs(), GFP_KERNEL);
                  if (NULL == (*purb)->transfer_buffer) {
                        usX2Y_urbs_release(subs);
                        return -ENOMEM;
                  }
            }
            (*purb)->dev = dev;
            (*purb)->pipe = pipe;
            (*purb)->number_of_packets = nr_of_packs();
            (*purb)->context = subs;
            (*purb)->interval = 1;
            (*purb)->complete = i_usX2Y_subs_startup;
      }
      return 0;
}

static void usX2Y_subs_startup(struct snd_usX2Y_substream *subs)
{
      struct usX2Ydev *usX2Y = subs->usX2Y;
      usX2Y->prepare_subs = subs;
      subs->urb[0]->start_frame = -1;
      wmb();
      usX2Y_urbs_set_complete(usX2Y, i_usX2Y_subs_startup);
}

static int usX2Y_urbs_start(struct snd_usX2Y_substream *subs)
{
      int i, err;
      struct usX2Ydev *usX2Y = subs->usX2Y;

      if ((err = usX2Y_urbs_allocate(subs)) < 0)
            return err;
      subs->completed_urb = NULL;
      for (i = 0; i < 4; i++) {
            struct snd_usX2Y_substream *subs = usX2Y->subs[i];
            if (subs != NULL && atomic_read(&subs->state) >= state_PREPARED)
                  goto start;
      }

 start:
      usX2Y_subs_startup(subs);
      for (i = 0; i < NRURBS; i++) {
            struct urb *urb = subs->urb[i];
            if (usb_pipein(urb->pipe)) {
                  unsigned long pack;
                  if (0 == i)
                        atomic_set(&subs->state, state_STARTING3);
                  urb->dev = usX2Y->dev;
                  urb->transfer_flags = URB_ISO_ASAP;
                  for (pack = 0; pack < nr_of_packs(); pack++) {
                        urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
                        urb->iso_frame_desc[pack].length = subs->maxpacksize;
                  }
                  urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs(); 
                  if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
                        snd_printk (KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
                        err = -EPIPE;
                        goto cleanup;
                  } else
                        if (i == 0)
                              usX2Y->wait_iso_frame = urb->start_frame;
                  urb->transfer_flags = 0;
            } else {
                  atomic_set(&subs->state, state_STARTING1);
                  break;
            }
      }
      err = 0;
      wait_event(usX2Y->prepare_wait_queue, NULL == usX2Y->prepare_subs);
      if (atomic_read(&subs->state) != state_PREPARED)
            err = -EPIPE;

 cleanup:
      if (err) {
            usX2Y_subs_startup_finish(usX2Y);
            usX2Y_clients_stop(usX2Y);          // something is completely wroong > stop evrything
      }
      return err;
}

/*
 * return the current pcm pointer.  just return the hwptr_done value.
 */
static snd_pcm_uframes_t snd_usX2Y_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct snd_usX2Y_substream *subs = substream->runtime->private_data;
      return subs->hwptr_done;
}
/*
 * start/stop substream
 */
static int snd_usX2Y_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct snd_usX2Y_substream *subs = substream->runtime->private_data;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            snd_printdd("snd_usX2Y_pcm_trigger(START)\n");
            if (atomic_read(&subs->state) == state_PREPARED &&
                atomic_read(&subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE]->state) >= state_PREPARED) {
                  atomic_set(&subs->state, state_PRERUNNING);
            } else {
                  snd_printdd("\n");
                  return -EPIPE;
            }
            break;
      case SNDRV_PCM_TRIGGER_STOP:
            snd_printdd("snd_usX2Y_pcm_trigger(STOP)\n");
            if (atomic_read(&subs->state) >= state_PRERUNNING)
                  atomic_set(&subs->state, state_PREPARED);
            break;
      default:
            return -EINVAL;
      }
      return 0;
}


/*
 * allocate a buffer, setup samplerate
 *
 * so far we use a physically linear buffer although packetize transfer
 * doesn't need a continuous area.
 * if sg buffer is supported on the later version of alsa, we'll follow
 * that.
 */
00583 static struct s_c2
{
      char c1, c2;
}
      SetRate44100[] =
{
      { 0x14, 0x08},    // this line sets 44100, well actually a little less
      { 0x18, 0x40},    // only tascam / frontier design knows the further lines .......
      { 0x18, 0x42},
      { 0x18, 0x45},
      { 0x18, 0x46},
      { 0x18, 0x48},
      { 0x18, 0x4A},
      { 0x18, 0x4C},
      { 0x18, 0x4E},
      { 0x18, 0x50},
      { 0x18, 0x52},
      { 0x18, 0x54},
      { 0x18, 0x56},
      { 0x18, 0x58},
      { 0x18, 0x5A},
      { 0x18, 0x5C},
      { 0x18, 0x5E},
      { 0x18, 0x60},
      { 0x18, 0x62},
      { 0x18, 0x64},
      { 0x18, 0x66},
      { 0x18, 0x68},
      { 0x18, 0x6A},
      { 0x18, 0x6C},
      { 0x18, 0x6E},
      { 0x18, 0x70},
      { 0x18, 0x72},
      { 0x18, 0x74},
      { 0x18, 0x76},
      { 0x18, 0x78},
      { 0x18, 0x7A},
      { 0x18, 0x7C},
      { 0x18, 0x7E}
};
static struct s_c2 SetRate48000[] =
{
      { 0x14, 0x09},    // this line sets 48000, well actually a little less
      { 0x18, 0x40},    // only tascam / frontier design knows the further lines .......
      { 0x18, 0x42},
      { 0x18, 0x45},
      { 0x18, 0x46},
      { 0x18, 0x48},
      { 0x18, 0x4A},
      { 0x18, 0x4C},
      { 0x18, 0x4E},
      { 0x18, 0x50},
      { 0x18, 0x52},
      { 0x18, 0x54},
      { 0x18, 0x56},
      { 0x18, 0x58},
      { 0x18, 0x5A},
      { 0x18, 0x5C},
      { 0x18, 0x5E},
      { 0x18, 0x60},
      { 0x18, 0x62},
      { 0x18, 0x64},
      { 0x18, 0x66},
      { 0x18, 0x68},
      { 0x18, 0x6A},
      { 0x18, 0x6C},
      { 0x18, 0x6E},
      { 0x18, 0x70},
      { 0x18, 0x73},
      { 0x18, 0x74},
      { 0x18, 0x76},
      { 0x18, 0x78},
      { 0x18, 0x7A},
      { 0x18, 0x7C},
      { 0x18, 0x7E}
};
#define NOOF_SETRATE_URBS ARRAY_SIZE(SetRate48000)

static void i_usX2Y_04Int(struct urb *urb)
{
      struct usX2Ydev *usX2Y = urb->context;
      
      if (urb->status)
            snd_printk(KERN_ERR "snd_usX2Y_04Int() urb->status=%i\n", urb->status);
      if (0 == --usX2Y->US04->len)
            wake_up(&usX2Y->In04WaitQueue);
}

static int usX2Y_rate_set(struct usX2Ydev *usX2Y, int rate)
{
      int               err = 0, i;
      struct snd_usX2Y_urbSeq *us = NULL;
      int               *usbdata = NULL;
      struct s_c2       *ra = rate == 48000 ? SetRate48000 : SetRate44100;

      if (usX2Y->rate != rate) {
            us = kzalloc(sizeof(*us) + sizeof(struct urb*) * NOOF_SETRATE_URBS, GFP_KERNEL);
            if (NULL == us) {
                  err = -ENOMEM;
                  goto cleanup;
            }
            usbdata = kmalloc(sizeof(int) * NOOF_SETRATE_URBS, GFP_KERNEL);
            if (NULL == usbdata) {
                  err = -ENOMEM;
                  goto cleanup;
            }
            for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
                  if (NULL == (us->urb[i] = usb_alloc_urb(0, GFP_KERNEL))) {
                        err = -ENOMEM;
                        goto cleanup;
                  }
                  ((char*)(usbdata + i))[0] = ra[i].c1;
                  ((char*)(usbdata + i))[1] = ra[i].c2;
                  usb_fill_bulk_urb(us->urb[i], usX2Y->dev, usb_sndbulkpipe(usX2Y->dev, 4),
                                usbdata + i, 2, i_usX2Y_04Int, usX2Y);
#ifdef OLD_USB
                  us->urb[i]->transfer_flags = USB_QUEUE_BULK;
#endif
            }
            us->submitted =   0;
            us->len =   NOOF_SETRATE_URBS;
            usX2Y->US04 =     us;
            wait_event_timeout(usX2Y->In04WaitQueue, 0 == us->len, HZ);
            usX2Y->US04 =     NULL;
            if (us->len)
                  err = -ENODEV;
      cleanup:
            if (us) {
                  us->submitted =   2*NOOF_SETRATE_URBS;
                  for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
                        struct urb *urb = us->urb[i];
                        if (urb->status) {
                              if (!err)
                                    err = -ENODEV;
                              usb_kill_urb(urb);
                        }
                        usb_free_urb(urb);
                  }
                  usX2Y->US04 = NULL;
                  kfree(usbdata);
                  kfree(us);
                  if (!err)
                        usX2Y->rate = rate;
            }
      }

      return err;
}


static int usX2Y_format_set(struct usX2Ydev *usX2Y, snd_pcm_format_t format)
{
      int alternate, err;
      struct list_head* p;
      if (format == SNDRV_PCM_FORMAT_S24_3LE) {
            alternate = 2;
            usX2Y->stride = 6;
      } else {
            alternate = 1;
            usX2Y->stride = 4;
      }
      list_for_each(p, &usX2Y->midi_list) {
            snd_usbmidi_input_stop(p);
      }
      usb_kill_urb(usX2Y->In04urb);
      if ((err = usb_set_interface(usX2Y->dev, 0, alternate))) {
            snd_printk(KERN_ERR "usb_set_interface error \n");
            return err;
      }
      usX2Y->In04urb->dev = usX2Y->dev;
      err = usb_submit_urb(usX2Y->In04urb, GFP_KERNEL);
      list_for_each(p, &usX2Y->midi_list) {
            snd_usbmidi_input_start(p);
      }
      usX2Y->format = format;
      usX2Y->rate = 0;
      return err;
}


static int snd_usX2Y_pcm_hw_params(struct snd_pcm_substream *substream,
                           struct snd_pcm_hw_params *hw_params)
{
      int               err = 0;
      unsigned int            rate = params_rate(hw_params);
      snd_pcm_format_t  format = params_format(hw_params);
      struct snd_card *card = substream->pstr->pcm->card;
      struct list_head *list;

      snd_printdd("snd_usX2Y_hw_params(%p, %p)\n", substream, hw_params);
      // all pcm substreams off one usX2Y have to operate at the same rate & format
      list_for_each(list, &card->devices) {
            struct snd_device *dev;
            struct snd_pcm *pcm;
            int s;
            dev = snd_device(list);
            if (dev->type != SNDRV_DEV_PCM)
                  continue;
            pcm = dev->device_data;
            for (s = 0; s < 2; ++s) {
                  struct snd_pcm_substream *test_substream;
                  test_substream = pcm->streams[s].substream;
                  if (test_substream && test_substream != substream  &&
                      test_substream->runtime &&
                      ((test_substream->runtime->format &&
                        test_substream->runtime->format != format) ||
                       (test_substream->runtime->rate &&
                        test_substream->runtime->rate != rate)))
                        return -EINVAL;
            }
      }
      if (0 > (err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)))) {
            snd_printk(KERN_ERR "snd_pcm_lib_malloc_pages(%p, %i) returned %i\n",
                     substream, params_buffer_bytes(hw_params), err);
            return err;
      }
      return 0;
}

/*
 * free the buffer
 */
static int snd_usX2Y_pcm_hw_free(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_usX2Y_substream *subs = runtime->private_data;
      mutex_lock(&subs->usX2Y->prepare_mutex);
      snd_printdd("snd_usX2Y_hw_free(%p)\n", substream);

      if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
            struct snd_usX2Y_substream *cap_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
            atomic_set(&subs->state, state_STOPPED);
            usX2Y_urbs_release(subs);
            if (!cap_subs->pcm_substream ||
                !cap_subs->pcm_substream->runtime ||
                !cap_subs->pcm_substream->runtime->status ||
                cap_subs->pcm_substream->runtime->status->state < SNDRV_PCM_STATE_PREPARED) {
                  atomic_set(&cap_subs->state, state_STOPPED);
                  usX2Y_urbs_release(cap_subs);
            }
      } else {
            struct snd_usX2Y_substream *playback_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
            if (atomic_read(&playback_subs->state) < state_PREPARED) {
                  atomic_set(&subs->state, state_STOPPED);
                  usX2Y_urbs_release(subs);
            }
      }
      mutex_unlock(&subs->usX2Y->prepare_mutex);
      return snd_pcm_lib_free_pages(substream);
}
/*
 * prepare callback
 *
 * set format and initialize urbs
 */
static int snd_usX2Y_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_usX2Y_substream *subs = runtime->private_data;
      struct usX2Ydev *usX2Y = subs->usX2Y;
      struct snd_usX2Y_substream *capsubs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
      int err = 0;
      snd_printdd("snd_usX2Y_pcm_prepare(%p)\n", substream);

      mutex_lock(&usX2Y->prepare_mutex);
      usX2Y_subs_prepare(subs);
// Start hardware streams
// SyncStream first....
      if (atomic_read(&capsubs->state) < state_PREPARED) {
            if (usX2Y->format != runtime->format)
                  if ((err = usX2Y_format_set(usX2Y, runtime->format)) < 0)
                        goto up_prepare_mutex;
            if (usX2Y->rate != runtime->rate)
                  if ((err = usX2Y_rate_set(usX2Y, runtime->rate)) < 0)
                        goto up_prepare_mutex;
            snd_printdd("starting capture pipe for %s\n", subs == capsubs ? "self" : "playpipe");
            if (0 > (err = usX2Y_urbs_start(capsubs)))
                  goto up_prepare_mutex;
      }

      if (subs != capsubs && atomic_read(&subs->state) < state_PREPARED)
            err = usX2Y_urbs_start(subs);

 up_prepare_mutex:
      mutex_unlock(&usX2Y->prepare_mutex);
      return err;
}

static struct snd_pcm_hardware snd_usX2Y_2c =
{
      .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                         SNDRV_PCM_INFO_BLOCK_TRANSFER |
                         SNDRV_PCM_INFO_MMAP_VALID |
                         SNDRV_PCM_INFO_BATCH),
      .formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
      .rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
      .rate_min =                44100,
      .rate_max =                48000,
      .channels_min =            2,
      .channels_max =            2,
      .buffer_bytes_max =     (2*128*1024),
      .period_bytes_min =     64,
      .period_bytes_max =     (128*1024),
      .periods_min =          2,
      .periods_max =          1024,
      .fifo_size =              0
};



static int snd_usX2Y_pcm_open(struct snd_pcm_substream *substream)
{
      struct snd_usX2Y_substream    *subs = ((struct snd_usX2Y_substream **)
                               snd_pcm_substream_chip(substream))[substream->stream];
      struct snd_pcm_runtime  *runtime = substream->runtime;

      if (subs->usX2Y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS)
            return -EBUSY;

      runtime->hw = snd_usX2Y_2c;
      runtime->private_data = subs;
      subs->pcm_substream = substream;
      snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
      return 0;
}



static int snd_usX2Y_pcm_close(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_usX2Y_substream *subs = runtime->private_data;

      subs->pcm_substream = NULL;

      return 0;
}


static struct snd_pcm_ops snd_usX2Y_pcm_ops = 
{
      .open =           snd_usX2Y_pcm_open,
      .close =    snd_usX2Y_pcm_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_usX2Y_pcm_hw_params,
      .hw_free =  snd_usX2Y_pcm_hw_free,
      .prepare =  snd_usX2Y_pcm_prepare,
      .trigger =  snd_usX2Y_pcm_trigger,
      .pointer =  snd_usX2Y_pcm_pointer,
};


/*
 * free a usb stream instance
 */
static void usX2Y_audio_stream_free(struct snd_usX2Y_substream **usX2Y_substream)
{
      kfree(usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]);
      usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK] = NULL;

      kfree(usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]);
      usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE] = NULL;
}

static void snd_usX2Y_pcm_private_free(struct snd_pcm *pcm)
{
      struct snd_usX2Y_substream **usX2Y_stream = pcm->private_data;
      if (usX2Y_stream)
            usX2Y_audio_stream_free(usX2Y_stream);
}

static int usX2Y_audio_stream_new(struct snd_card *card, int playback_endpoint, int capture_endpoint)
{
      struct snd_pcm *pcm;
      int err, i;
      struct snd_usX2Y_substream **usX2Y_substream =
            usX2Y(card)->subs + 2 * usX2Y(card)->pcm_devs;

      for (i = playback_endpoint ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
           i <= SNDRV_PCM_STREAM_CAPTURE; ++i) {
            usX2Y_substream[i] = kzalloc(sizeof(struct snd_usX2Y_substream), GFP_KERNEL);
            if (NULL == usX2Y_substream[i]) {
                  snd_printk(KERN_ERR "cannot malloc\n");
                  return -ENOMEM;
            }
            usX2Y_substream[i]->usX2Y = usX2Y(card);
      }

      if (playback_endpoint)
            usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]->endpoint = playback_endpoint;
      usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]->endpoint = capture_endpoint;

      err = snd_pcm_new(card, NAME_ALLCAPS" Audio", usX2Y(card)->pcm_devs,
                    playback_endpoint ? 1 : 0, 1,
                    &pcm);
      if (err < 0) {
            usX2Y_audio_stream_free(usX2Y_substream);
            return err;
      }

      if (playback_endpoint)
            snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usX2Y_pcm_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usX2Y_pcm_ops);

      pcm->private_data = usX2Y_substream;
      pcm->private_free = snd_usX2Y_pcm_private_free;
      pcm->info_flags = 0;

      sprintf(pcm->name, NAME_ALLCAPS" Audio #%d", usX2Y(card)->pcm_devs);

      if ((playback_endpoint &&
           0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
                                         SNDRV_DMA_TYPE_CONTINUOUS,
                                         snd_dma_continuous_data(GFP_KERNEL),
                                         64*1024, 128*1024))) ||
          0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
                                         SNDRV_DMA_TYPE_CONTINUOUS,
                                         snd_dma_continuous_data(GFP_KERNEL),
                                         64*1024, 128*1024))) {
            snd_usX2Y_pcm_private_free(pcm);
            return err;
      }
      usX2Y(card)->pcm_devs++;

      return 0;
}

/*
 * create a chip instance and set its names.
 */
int usX2Y_audio_create(struct snd_card *card)
{
      int err = 0;
      
      INIT_LIST_HEAD(&usX2Y(card)->pcm_list);

      if (0 > (err = usX2Y_audio_stream_new(card, 0xA, 0x8)))
            return err;
      if (le16_to_cpu(usX2Y(card)->dev->descriptor.idProduct) == USB_ID_US428)
           if (0 > (err = usX2Y_audio_stream_new(card, 0, 0xA)))
                 return err;
      if (le16_to_cpu(usX2Y(card)->dev->descriptor.idProduct) != USB_ID_US122)
            err = usX2Y_rate_set(usX2Y(card), 44100); // Lets us428 recognize output-volume settings, disturbs us122.
      return err;
}

Generated by  Doxygen 1.6.0   Back to index