#include <linux/ratelimit.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
+#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
+#include <sound/pcm_params.h>
#include "usbaudio.h"
#include "helper.h"
#include "endpoint.h"
#include "pcm.h"
+#define EP_FLAG_ACTIVATED 0
+#define EP_FLAG_RUNNING 1
+
/*
* convert a sampling rate into our full speed format (fs/1000 in Q16.16)
* this will overflow at approx 524 kHz
/*
* unlink active urbs.
*/
-static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
+static int deactivate_urbs_old(struct snd_usb_substream *subs, int force, int can_sleep)
{
struct snd_usb_audio *chip = subs->stream->chip;
unsigned int i;
/*
* wait until all urbs are processed.
*/
-static int wait_clear_urbs(struct snd_usb_substream *subs)
+static int wait_clear_urbs_old(struct snd_usb_substream *subs)
{
unsigned long end_time = jiffies + msecs_to_jiffies(1000);
unsigned int i;
int i;
/* stop urbs (to be sure) */
- deactivate_urbs(subs, force, 1);
- wait_clear_urbs(subs);
+ deactivate_urbs_old(subs, force, 1);
+ wait_clear_urbs_old(subs);
for (i = 0; i < MAX_URBS; i++)
release_urb_ctx(&subs->dataurb[i]);
/*
* complete callback from data urb
*/
-static void snd_complete_urb(struct urb *urb)
+static void snd_complete_urb_old(struct urb *urb)
{
struct snd_urb_ctx *ctx = urb->context;
struct snd_usb_substream *subs = ctx->subs;
u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
u->urb->interval = 1 << subs->datainterval;
u->urb->context = u;
- u->urb->complete = snd_complete_urb;
+ u->urb->complete = snd_complete_urb_old;
}
if (subs->syncpipe) {
__error:
// snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
- deactivate_urbs(subs, 0, 0);
+ deactivate_urbs_old(subs, 0, 0);
return -EPIPE;
}
subs->ops.prepare = prepare_playback_urb;
return 0;
case SNDRV_PCM_TRIGGER_STOP:
- return deactivate_urbs(subs, 0, 0);
+ return deactivate_urbs_old(subs, 0, 0);
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
subs->ops.prepare = prepare_nodata_playback_urb;
return 0;
subs->ops.retire = retire_capture_urb;
return start_urbs(subs, substream->runtime);
case SNDRV_PCM_TRIGGER_STOP:
- return deactivate_urbs(subs, 0, 0);
+ return deactivate_urbs_old(subs, 0, 0);
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
subs->ops.retire = retire_paused_capture_urb;
return 0;
struct snd_pcm_runtime *runtime)
{
/* clear urbs (to be sure) */
- deactivate_urbs(subs, 0, 1);
- wait_clear_urbs(subs);
+ deactivate_urbs_old(subs, 0, 1);
+ wait_clear_urbs_old(subs);
/* for playback, submit the URBs now; otherwise, the first hwptr_done
* updates for all URBs would happen at the same time when starting */
return 0;
}
+int snd_usb_endpoint_implict_feedback_sink(struct snd_usb_endpoint *ep)
+{
+ return ep->sync_master &&
+ ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA &&
+ ep->type == SND_USB_ENDPOINT_TYPE_DATA &&
+ usb_pipeout(ep->pipe);
+}
+
+/* determine the number of frames in the next packet */
+static int next_packet_size(struct snd_usb_endpoint *ep)
+{
+ unsigned long flags;
+ int ret;
+
+ if (ep->fill_max)
+ return ep->maxframesize;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ ep->phase = (ep->phase & 0xffff)
+ + (ep->freqm << ep->datainterval);
+ ret = min(ep->phase >> 16, ep->maxframesize);
+ spin_unlock_irqrestore(&ep->lock, flags);
+
+ return ret;
+}
+
+static void retire_outbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *urb_ctx)
+{
+ if (ep->retire_data_urb)
+ ep->retire_data_urb(ep->data_subs, urb_ctx->urb);
+}
+
+static void retire_inbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *urb_ctx)
+{
+ struct urb *urb = urb_ctx->urb;
+
+ if (ep->sync_slave)
+ snd_usb_handle_sync_urb(ep->sync_slave, ep, urb);
+
+ if (ep->retire_data_urb)
+ ep->retire_data_urb(ep->data_subs, urb);
+}
+
+static void prepare_outbound_urb_sizes(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->packets; ++i)
+ ctx->packet_size[i] = next_packet_size(ep);
+}
+
+/*
+ * Prepare a PLAYBACK urb for submission to the bus.
+ */
+static void prepare_outbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *ctx)
+{
+ int i;
+ struct urb *urb = ctx->urb;
+ unsigned char *cp = urb->transfer_buffer;
+
+ urb->dev = ep->chip->dev; /* we need to set this at each time */
+
+ switch (ep->type) {
+ case SND_USB_ENDPOINT_TYPE_DATA:
+ if (ep->prepare_data_urb) {
+ ep->prepare_data_urb(ep->data_subs, urb);
+ } else {
+ /* no data provider, so send silence */
+ unsigned int offs = 0;
+ for (i = 0; i < ctx->packets; ++i) {
+ int counts = ctx->packet_size[i];
+ urb->iso_frame_desc[i].offset = offs * ep->stride;
+ urb->iso_frame_desc[i].length = counts * ep->stride;
+ offs += counts;
+ }
+
+ urb->number_of_packets = ctx->packets;
+ urb->transfer_buffer_length = offs * ep->stride;
+ memset(urb->transfer_buffer, ep->silence_value,
+ offs * ep->stride);
+ }
+ break;
+
+ case SND_USB_ENDPOINT_TYPE_SYNC:
+ if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) {
+ /*
+ * fill the length and offset of each urb descriptor.
+ * the fixed 12.13 frequency is passed as 16.16 through the pipe.
+ */
+ urb->iso_frame_desc[0].length = 4;
+ urb->iso_frame_desc[0].offset = 0;
+ cp[0] = ep->freqn;
+ cp[1] = ep->freqn >> 8;
+ cp[2] = ep->freqn >> 16;
+ cp[3] = ep->freqn >> 24;
+ } else {
+ /*
+ * fill the length and offset of each urb descriptor.
+ * the fixed 10.14 frequency is passed through the pipe.
+ */
+ urb->iso_frame_desc[0].length = 3;
+ urb->iso_frame_desc[0].offset = 0;
+ cp[0] = ep->freqn >> 2;
+ cp[1] = ep->freqn >> 10;
+ cp[2] = ep->freqn >> 18;
+ }
+
+ break;
+ }
+}
+
+/*
+ * Prepare a CAPTURE or SYNC urb for submission to the bus.
+ */
+static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *urb_ctx)
+{
+ int i, offs;
+ struct urb *urb = urb_ctx->urb;
+
+ urb->dev = ep->chip->dev; /* we need to set this at each time */
+
+ switch (ep->type) {
+ case SND_USB_ENDPOINT_TYPE_DATA:
+ offs = 0;
+ for (i = 0; i < urb_ctx->packets; i++) {
+ urb->iso_frame_desc[i].offset = offs;
+ urb->iso_frame_desc[i].length = ep->curpacksize;
+ offs += ep->curpacksize;
+ }
+
+ urb->transfer_buffer_length = offs;
+ urb->number_of_packets = urb_ctx->packets;
+ break;
+
+ case SND_USB_ENDPOINT_TYPE_SYNC:
+ urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize);
+ urb->iso_frame_desc[0].offset = 0;
+ break;
+ }
+}
+
+static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
+{
+ while (test_bit(EP_FLAG_RUNNING, &ep->flags)) {
+
+ unsigned long flags;
+ struct snd_usb_packet_info *packet;
+ struct snd_urb_ctx *ctx = NULL;
+ struct urb *urb;
+ int err, i;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ if (ep->next_packet_read_pos != ep->next_packet_write_pos) {
+ packet = ep->next_packet + ep->next_packet_read_pos;
+ ep->next_packet_read_pos++;
+ ep->next_packet_read_pos %= MAX_URBS;
+
+ /* take URB out of FIFO */
+ if (!list_empty(&ep->ready_playback_urbs))
+ ctx = list_first_entry(&ep->ready_playback_urbs,
+ struct snd_urb_ctx, ready_list);
+ }
+ spin_unlock_irqrestore(&ep->lock, flags);
+
+ if (ctx == NULL)
+ return;
+
+ list_del_init(&ctx->ready_list);
+ urb = ctx->urb;
+
+ /* copy over the length information */
+ for (i = 0; i < packet->packets; i++)
+ ctx->packet_size[i] = packet->packet_size[i];
+
+ prepare_outbound_urb(ep, ctx);
+
+ err = usb_submit_urb(ctx->urb, GFP_ATOMIC);
+ if (err < 0)
+ snd_printk(KERN_ERR "Unable to submit urb #%d: %d (urb %p)\n",
+ ctx->index, err, ctx->urb);
+ else
+ set_bit(ctx->index, &ep->active_mask);
+ }
+}
+
+/*
+ * complete callback for urbs
+ */
+static void snd_complete_urb(struct urb *urb)
+{
+ struct snd_urb_ctx *ctx = urb->context;
+ struct snd_usb_endpoint *ep = ctx->ep;
+ int err;
+
+ if (unlikely(urb->status == -ENOENT || /* unlinked */
+ urb->status == -ENODEV || /* device removed */
+ urb->status == -ECONNRESET || /* unlinked */
+ urb->status == -ESHUTDOWN || /* device disabled */
+ ep->chip->shutdown)) /* device disconnected */
+ goto exit_clear;
+
+ if (usb_pipeout(ep->pipe)) {
+ retire_outbound_urb(ep, ctx);
+ /* can be stopped during retire callback */
+ if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
+ goto exit_clear;
+
+ if (snd_usb_endpoint_implict_feedback_sink(ep)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
+ spin_unlock_irqrestore(&ep->lock, flags);
+ queue_pending_output_urbs(ep);
+
+ goto exit_clear;
+ }
+
+ prepare_outbound_urb_sizes(ep, ctx);
+ prepare_outbound_urb(ep, ctx);
+ } else {
+ retire_inbound_urb(ep, ctx);
+ /* can be stopped during retire callback */
+ if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
+ goto exit_clear;
+
+ prepare_inbound_urb(ep, ctx);
+ }
+
+ err = usb_submit_urb(urb, GFP_ATOMIC);
+ if (err == 0)
+ return;
+
+ snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err);
+ //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+
+exit_clear:
+ clear_bit(ctx->index, &ep->active_mask);
+}
+
+struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
+ struct usb_host_interface *alts,
+ int ep_num, int direction, int type)
+{
+ struct list_head *p;
+ struct snd_usb_endpoint *ep;
+ int ret, is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK;
+
+ mutex_lock(&chip->mutex);
+
+ list_for_each(p, &chip->ep_list) {
+ ep = list_entry(p, struct snd_usb_endpoint, list);
+ if (ep->ep_num == ep_num &&
+ ep->iface == alts->desc.bInterfaceNumber &&
+ ep->alt_idx == alts->desc.bAlternateSetting) {
+ snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n",
+ ep_num, ep->iface, ep->alt_idx, ep);
+ goto __exit_unlock;
+ }
+ }
+
+ snd_printdd(KERN_DEBUG "Creating new %s %s endpoint #%x\n",
+ is_playback ? "playback" : "capture",
+ type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync",
+ ep_num);
+
+ /* select the alt setting once so the endpoints become valid */
+ ret = usb_set_interface(chip->dev, alts->desc.bInterfaceNumber,
+ alts->desc.bAlternateSetting);
+ if (ret < 0) {
+ snd_printk(KERN_ERR "%s(): usb_set_interface() failed, ret = %d\n",
+ __func__, ret);
+ ep = NULL;
+ goto __exit_unlock;
+ }
+
+ ep = kzalloc(sizeof(*ep), GFP_KERNEL);
+ if (!ep)
+ goto __exit_unlock;
+
+ ep->chip = chip;
+ spin_lock_init(&ep->lock);
+ ep->type = type;
+ ep->ep_num = ep_num;
+ ep->iface = alts->desc.bInterfaceNumber;
+ ep->alt_idx = alts->desc.bAlternateSetting;
+ INIT_LIST_HEAD(&ep->ready_playback_urbs);
+ ep_num &= USB_ENDPOINT_NUMBER_MASK;
+
+ if (is_playback)
+ ep->pipe = usb_sndisocpipe(chip->dev, ep_num);
+ else
+ ep->pipe = usb_rcvisocpipe(chip->dev, ep_num);
+
+ if (type == SND_USB_ENDPOINT_TYPE_SYNC) {
+ if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
+ get_endpoint(alts, 1)->bRefresh >= 1 &&
+ get_endpoint(alts, 1)->bRefresh <= 9)
+ ep->syncinterval = get_endpoint(alts, 1)->bRefresh;
+ else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL)
+ ep->syncinterval = 1;
+ else if (get_endpoint(alts, 1)->bInterval >= 1 &&
+ get_endpoint(alts, 1)->bInterval <= 16)
+ ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
+ else
+ ep->syncinterval = 3;
+
+ ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
+ }
+
+ list_add_tail(&ep->list, &chip->ep_list);
+
+__exit_unlock:
+ mutex_unlock(&chip->mutex);
+
+ return ep;
+}
+
+/*
+ * wait until all urbs are processed.
+ */
+static int wait_clear_urbs(struct snd_usb_endpoint *ep)
+{
+ unsigned long end_time = jiffies + msecs_to_jiffies(1000);
+ unsigned int i;
+ int alive;
+
+ do {
+ alive = 0;
+ for (i = 0; i < ep->nurbs; i++)
+ if (test_bit(i, &ep->active_mask))
+ alive++;
+
+ if (!alive)
+ break;
+
+ schedule_timeout_uninterruptible(1);
+ } while (time_before(jiffies, end_time));
+
+ if (alive)
+ snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n",
+ alive, ep->ep_num);
+
+ return 0;
+}
+
+/*
+ * unlink active urbs.
+ */
+static int deactivate_urbs(struct snd_usb_endpoint *ep, int force, int can_sleep)
+{
+ unsigned long flags;
+ unsigned int i;
+ int async;
+
+ if (!force && ep->chip->shutdown) /* to be sure... */
+ return -EBADFD;
+
+ async = !can_sleep && ep->chip->async_unlink;
+
+ clear_bit(EP_FLAG_RUNNING, &ep->flags);
+
+ INIT_LIST_HEAD(&ep->ready_playback_urbs);
+ ep->next_packet_read_pos = 0;
+ ep->next_packet_write_pos = 0;
+
+ if (!async && in_interrupt())
+ return 0;
+
+ for (i = 0; i < ep->nurbs; i++) {
+ if (test_bit(i, &ep->active_mask)) {
+ if (!test_and_set_bit(i, &ep->unlink_mask)) {
+ struct urb *u = ep->urb[i].urb;
+ if (async)
+ usb_unlink_urb(u);
+ else
+ usb_kill_urb(u);
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * release an endpoint's urbs
+ */
+static void release_urbs(struct snd_usb_endpoint *ep, int force)
+{
+ int i;
+
+ /* route incoming urbs to nirvana */
+ ep->retire_data_urb = NULL;
+ ep->prepare_data_urb = NULL;
+
+ /* stop urbs */
+ deactivate_urbs(ep, force, 1);
+ wait_clear_urbs(ep);
+
+ for (i = 0; i < ep->nurbs; i++)
+ release_urb_ctx(&ep->urb[i]);
+
+ if (ep->syncbuf)
+ usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,
+ ep->syncbuf, ep->sync_dma);
+
+ ep->syncbuf = NULL;
+ ep->nurbs = 0;
+}
+
+static int data_ep_set_params(struct snd_usb_endpoint *ep,
+ struct snd_pcm_hw_params *hw_params,
+ struct audioformat *fmt,
+ struct snd_usb_endpoint *sync_ep)
+{
+ unsigned int maxsize, i, urb_packs, total_packs, packs_per_ms;
+ int period_bytes = params_period_bytes(hw_params);
+ int format = params_format(hw_params);
+ int is_playback = usb_pipeout(ep->pipe);
+ int frame_bits = snd_pcm_format_physical_width(params_format(hw_params)) *
+ params_channels(hw_params);
+
+ ep->datainterval = fmt->datainterval;
+ ep->stride = frame_bits >> 3;
+ ep->silence_value = format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;
+
+ /* calculate max. frequency */
+ if (ep->maxpacksize) {
+ /* whatever fits into a max. size packet */
+ maxsize = ep->maxpacksize;
+ ep->freqmax = (maxsize / (frame_bits >> 3))
+ << (16 - ep->datainterval);
+ } else {
+ /* no max. packet size: just take 25% higher than nominal */
+ ep->freqmax = ep->freqn + (ep->freqn >> 2);
+ maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3))
+ >> (16 - ep->datainterval);
+ }
+
+ if (ep->fill_max)
+ ep->curpacksize = ep->maxpacksize;
+ else
+ ep->curpacksize = maxsize;
+
+ if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL)
+ packs_per_ms = 8 >> ep->datainterval;
+ else
+ packs_per_ms = 1;
+
+ if (is_playback && !snd_usb_endpoint_implict_feedback_sink(ep)) {
+ urb_packs = max(ep->chip->nrpacks, 1);
+ urb_packs = min(urb_packs, (unsigned int) MAX_PACKS);
+ } else {
+ urb_packs = 1;
+ }
+
+ urb_packs *= packs_per_ms;
+
+ if (sync_ep && !snd_usb_endpoint_implict_feedback_sink(ep))
+ urb_packs = min(urb_packs, 1U << sync_ep->syncinterval);
+
+ /* decide how many packets to be used */
+ if (is_playback && !snd_usb_endpoint_implict_feedback_sink(ep)) {
+ unsigned int minsize, maxpacks;
+ /* determine how small a packet can be */
+ minsize = (ep->freqn >> (16 - ep->datainterval))
+ * (frame_bits >> 3);
+ /* with sync from device, assume it can be 12% lower */
+ if (sync_ep)
+ minsize -= minsize >> 3;
+ minsize = max(minsize, 1u);
+ total_packs = (period_bytes + minsize - 1) / minsize;
+ /* we need at least two URBs for queueing */
+ if (total_packs < 2) {
+ total_packs = 2;
+ } else {
+ /* and we don't want too long a queue either */
+ maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
+ total_packs = min(total_packs, maxpacks);
+ }
+ } else {
+ while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
+ urb_packs >>= 1;
+ total_packs = MAX_URBS * urb_packs;
+ }
+
+ ep->nurbs = (total_packs + urb_packs - 1) / urb_packs;
+ if (ep->nurbs > MAX_URBS) {
+ /* too much... */
+ ep->nurbs = MAX_URBS;
+ total_packs = MAX_URBS * urb_packs;
+ } else if (ep->nurbs < 2) {
+ /* too little - we need at least two packets
+ * to ensure contiguous playback/capture
+ */
+ ep->nurbs = 2;
+ }
+
+ /* allocate and initialize data urbs */
+ for (i = 0; i < ep->nurbs; i++) {
+ struct snd_urb_ctx *u = &ep->urb[i];
+ u->index = i;
+ u->ep = ep;
+ u->packets = (i + 1) * total_packs / ep->nurbs
+ - i * total_packs / ep->nurbs;
+ u->buffer_size = maxsize * u->packets;
+
+ if (fmt->fmt_type == UAC_FORMAT_TYPE_II)
+ u->packets++; /* for transfer delimiter */
+ u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
+ if (!u->urb)
+ goto out_of_memory;
+
+ u->urb->transfer_buffer =
+ usb_alloc_coherent(ep->chip->dev, u->buffer_size,
+ GFP_KERNEL, &u->urb->transfer_dma);
+ if (!u->urb->transfer_buffer)
+ goto out_of_memory;
+ u->urb->pipe = ep->pipe;
+ u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+ u->urb->interval = 1 << ep->datainterval;
+ u->urb->context = u;
+ u->urb->complete = snd_complete_urb;
+ INIT_LIST_HEAD(&u->ready_list);
+ }
+
+ return 0;
+
+out_of_memory:
+ release_urbs(ep, 0);
+ return -ENOMEM;
+}
+
+static int sync_ep_set_params(struct snd_usb_endpoint *ep,
+ struct snd_pcm_hw_params *hw_params,
+ struct audioformat *fmt)
+{
+ int i;
+
+ ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4,
+ GFP_KERNEL, &ep->sync_dma);
+ if (!ep->syncbuf)
+ return -ENOMEM;
+
+ for (i = 0; i < SYNC_URBS; i++) {
+ struct snd_urb_ctx *u = &ep->urb[i];
+ u->index = i;
+ u->ep = ep;
+ u->packets = 1;
+ u->urb = usb_alloc_urb(1, GFP_KERNEL);
+ if (!u->urb)
+ goto out_of_memory;
+ u->urb->transfer_buffer = ep->syncbuf + i * 4;
+ u->urb->transfer_dma = ep->sync_dma + i * 4;
+ u->urb->transfer_buffer_length = 4;
+ u->urb->pipe = ep->pipe;
+ u->urb->transfer_flags = URB_ISO_ASAP |
+ URB_NO_TRANSFER_DMA_MAP;
+ u->urb->number_of_packets = 1;
+ u->urb->interval = 1 << ep->syncinterval;
+ u->urb->context = u;
+ u->urb->complete = snd_complete_urb;
+ }
+
+ ep->nurbs = SYNC_URBS;
+
+ return 0;
+
+out_of_memory:
+ release_urbs(ep, 0);
+ return -ENOMEM;
+}
+
+int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
+ struct snd_pcm_hw_params *hw_params,
+ struct audioformat *fmt,
+ struct snd_usb_endpoint *sync_ep)
+{
+ int err;
+
+ if (ep->use_count != 0) {
+ snd_printk(KERN_WARNING "Unable to change format on ep #%x: already in use\n",
+ ep->ep_num);
+ return -EBUSY;
+ }
+
+ /* release old buffers, if any */
+ release_urbs(ep, 0);
+
+ ep->datainterval = fmt->datainterval;
+ ep->maxpacksize = fmt->maxpacksize;
+ ep->fill_max = fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX;
+
+ if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL)
+ ep->freqn = get_usb_full_speed_rate(params_rate(hw_params));
+ else
+ ep->freqn = get_usb_high_speed_rate(params_rate(hw_params));
+
+ /* calculate the frequency in 16.16 format */
+ ep->freqm = ep->freqn;
+ ep->freqshift = INT_MIN;
+
+ ep->phase = 0;
+
+ switch (ep->type) {
+ case SND_USB_ENDPOINT_TYPE_DATA:
+ err = data_ep_set_params(ep, hw_params, fmt, sync_ep);
+ break;
+ case SND_USB_ENDPOINT_TYPE_SYNC:
+ err = sync_ep_set_params(ep, hw_params, fmt);
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+ snd_printdd(KERN_DEBUG "Setting params for ep #%x (type %d, %d urbs), ret=%d\n",
+ ep->ep_num, ep->type, ep->nurbs, err);
+
+ return err;
+}
+
+int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
+{
+ int err;
+ unsigned int i;
+
+ if (ep->chip->shutdown)
+ return -EBADFD;
+
+ /* already running? */
+ if (++ep->use_count != 1)
+ return 0;
+
+ if (snd_BUG_ON(!test_bit(EP_FLAG_ACTIVATED, &ep->flags)))
+ return -EINVAL;
+
+ /* just to be sure */
+ deactivate_urbs(ep, 0, 1);
+ wait_clear_urbs(ep);
+
+ ep->active_mask = 0;
+ ep->unlink_mask = 0;
+ ep->phase = 0;
+
+ /*
+ * If this endpoint has a data endpoint as implicit feedback source,
+ * don't start the urbs here. Instead, mark them all as available,
+ * wait for the record urbs to arrive and queue from that context.
+ */
+
+ set_bit(EP_FLAG_RUNNING, &ep->flags);
+
+ if (snd_usb_endpoint_implict_feedback_sink(ep)) {
+ for (i = 0; i < ep->nurbs; i++) {
+ struct snd_urb_ctx *ctx = ep->urb + i;
+ list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
+ }
+
+ return 0;
+ }
+
+ for (i = 0; i < ep->nurbs; i++) {
+ struct urb *urb = ep->urb[i].urb;
+
+ if (snd_BUG_ON(!urb))
+ goto __error;
+
+ if (usb_pipeout(ep->pipe)) {
+ prepare_outbound_urb_sizes(ep, urb->context);
+ prepare_outbound_urb(ep, urb->context);
+ } else {
+ prepare_inbound_urb(ep, urb->context);
+ }
+
+ err = usb_submit_urb(urb, GFP_ATOMIC);
+ if (err < 0) {
+ snd_printk(KERN_ERR "cannot submit urb %d, error %d: %s\n",
+ i, err, usb_error_string(err));
+ goto __error;
+ }
+ set_bit(i, &ep->active_mask);
+ }
+
+ return 0;
+
+__error:
+ clear_bit(EP_FLAG_RUNNING, &ep->flags);
+ ep->use_count--;
+ deactivate_urbs(ep, 0, 0);
+ return -EPIPE;
+}
+
+void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep,
+ int force, int can_sleep, int wait)
+{
+ if (!ep)
+ return;
+
+ if (snd_BUG_ON(ep->use_count == 0))
+ return;
+
+ if (snd_BUG_ON(!test_bit(EP_FLAG_ACTIVATED, &ep->flags)))
+ return;
+
+ if (--ep->use_count == 0) {
+ deactivate_urbs(ep, force, can_sleep);
+ ep->data_subs = NULL;
+ ep->sync_slave = NULL;
+ ep->retire_data_urb = NULL;
+ ep->prepare_data_urb = NULL;
+
+ if (wait)
+ wait_clear_urbs(ep);
+ }
+}
+
+int snd_usb_endpoint_activate(struct snd_usb_endpoint *ep)
+{
+ if (ep->use_count != 0)
+ return 0;
+
+ if (!ep->chip->shutdown &&
+ !test_and_set_bit(EP_FLAG_ACTIVATED, &ep->flags)) {
+ int ret;
+
+ ret = usb_set_interface(ep->chip->dev, ep->iface, ep->alt_idx);
+ if (ret < 0) {
+ snd_printk(KERN_ERR "%s() usb_set_interface() failed, ret = %d\n",
+ __func__, ret);
+ clear_bit(EP_FLAG_ACTIVATED, &ep->flags);
+ return ret;
+ }
+
+ return 0;
+ }
+
+ return -EBUSY;
+}
+
+int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
+{
+ if (!ep)
+ return -EINVAL;
+
+ if (ep->use_count != 0)
+ return 0;
+
+ if (!ep->chip->shutdown &&
+ test_and_clear_bit(EP_FLAG_ACTIVATED, &ep->flags)) {
+ int ret;
+
+ ret = usb_set_interface(ep->chip->dev, ep->iface, 0);
+ if (ret < 0) {
+ snd_printk(KERN_ERR "%s(): usb_set_interface() failed, ret = %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ return 0;
+ }
+
+ return -EBUSY;
+}
+
+void snd_usb_endpoint_free(struct list_head *head)
+{
+ struct snd_usb_endpoint *ep;
+
+ ep = list_entry(head, struct snd_usb_endpoint, list);
+ release_urbs(ep, 1);
+ kfree(ep);
+}
+
+/*
+ * process after playback sync complete
+ *
+ * Full speed devices report feedback values in 10.14 format as samples per
+ * frame, high speed devices in 16.16 format as samples per microframe.
+ * Because the Audio Class 1 spec was written before USB 2.0, many high speed
+ * devices use a wrong interpretation, some others use an entirely different
+ * format. Therefore, we cannot predict what format any particular device uses
+ * and must detect it automatically.
+ */
+void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
+ struct snd_usb_endpoint *sender,
+ const struct urb *urb)
+{
+ int shift;
+ unsigned int f;
+ unsigned long flags;
+
+ snd_BUG_ON(ep == sender);
+
+ if (snd_usb_endpoint_implict_feedback_sink(ep) &&
+ ep->use_count != 0) {
+
+ /* implicit feedback case */
+ int i, bytes = 0;
+ struct snd_urb_ctx *in_ctx;
+ struct snd_usb_packet_info *out_packet;
+
+ in_ctx = urb->context;
+
+ /* Count overall packet size */
+ for (i = 0; i < in_ctx->packets; i++)
+ if (urb->iso_frame_desc[i].status == 0)
+ bytes += urb->iso_frame_desc[i].actual_length;
+
+ /*
+ * skip empty packets. At least M-Audio's Fast Track Ultra stops
+ * streaming once it received a 0-byte OUT URB
+ */
+ if (bytes == 0)
+ return;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ out_packet = ep->next_packet + ep->next_packet_write_pos;
+
+ /*
+ * Iterate through the inbound packet and prepare the lengths
+ * for the output packet. The OUT packet we are about to send
+ * will have the same amount of payload than the IN packet we
+ * just received.
+ */
+
+ out_packet->packets = in_ctx->packets;
+ for (i = 0; i < in_ctx->packets; i++) {
+ if (urb->iso_frame_desc[i].status == 0)
+ out_packet->packet_size[i] =
+ urb->iso_frame_desc[i].actual_length / ep->stride;
+ else
+ out_packet->packet_size[i] = 0;
+ }
+
+ ep->next_packet_write_pos++;
+ ep->next_packet_write_pos %= MAX_URBS;
+ spin_unlock_irqrestore(&ep->lock, flags);
+ queue_pending_output_urbs(ep);
+
+ return;
+ }
+
+ /* parse sync endpoint packet */
+
+ if (urb->iso_frame_desc[0].status != 0 ||
+ urb->iso_frame_desc[0].actual_length < 3)
+ return;
+
+ f = le32_to_cpup(urb->transfer_buffer);
+ if (urb->iso_frame_desc[0].actual_length == 3)
+ f &= 0x00ffffff;
+ else
+ f &= 0x0fffffff;
+
+ if (f == 0)
+ return;
+
+ if (unlikely(ep->freqshift == INT_MIN)) {
+ /*
+ * The first time we see a feedback value, determine its format
+ * by shifting it left or right until it matches the nominal
+ * frequency value. This assumes that the feedback does not
+ * differ from the nominal value more than +50% or -25%.
+ */
+ shift = 0;
+ while (f < ep->freqn - ep->freqn / 4) {
+ f <<= 1;
+ shift++;
+ }
+ while (f > ep->freqn + ep->freqn / 2) {
+ f >>= 1;
+ shift--;
+ }
+ ep->freqshift = shift;
+ } else if (ep->freqshift >= 0)
+ f <<= ep->freqshift;
+ else
+ f >>= -ep->freqshift;
+
+ if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) {
+ /*
+ * If the frequency looks valid, set it.
+ * This value is referred to in prepare_playback_urb().
+ */
+ spin_lock_irqsave(&ep->lock, flags);
+ ep->freqm = f;
+ spin_unlock_irqrestore(&ep->lock, flags);
+ } else {
+ /*
+ * Out of range; maybe the shift value is wrong.
+ * Reset it so that we autodetect again the next time.
+ */
+ ep->freqshift = INT_MIN;
+ }
+}
+
projects / users / hch / misc.git / commitdiff