pcm.c 44.6 KB
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/*
 *   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/init.h>
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#include <linux/slab.h>
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#include <linux/bitrev.h>
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#include <linux/ratelimit.h>
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#include <linux/usb.h>
#include <linux/usb/audio.h>
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#include <linux/usb/audio-v2.h>
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#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "usbaudio.h"
#include "card.h"
#include "quirks.h"
#include "debug.h"
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#include "endpoint.h"
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#include "helper.h"
#include "pcm.h"
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#include "clock.h"
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#include "power.h"
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#define SUBSTREAM_FLAG_DATA_EP_STARTED	0
#define SUBSTREAM_FLAG_SYNC_EP_STARTED	1

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/* return the estimated delay based on USB frame counters */
snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
				    unsigned int rate)
{
	int current_frame_number;
	int frame_diff;
	int est_delay;

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	if (!subs->last_delay)
		return 0; /* short path */

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	current_frame_number = usb_get_current_frame_number(subs->dev);
	/*
	 * HCD implementations use different widths, use lower 8 bits.
	 * The delay will be managed up to 256ms, which is more than
	 * enough
	 */
	frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;

	/* Approximation based on number of samples per USB frame (ms),
	   some truncation for 44.1 but the estimate is good enough */
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	est_delay =  frame_diff * rate / 1000;
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
		est_delay = subs->last_delay - est_delay;
	else
		est_delay = subs->last_delay + est_delay;

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	if (est_delay < 0)
		est_delay = 0;
	return est_delay;
}

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/*
 * return the current pcm pointer.  just based on the hwptr_done value.
 */
static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs;
	unsigned int hwptr_done;

	subs = (struct snd_usb_substream *)substream->runtime->private_data;
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	if (subs->stream->chip->shutdown)
		return SNDRV_PCM_POS_XRUN;
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	spin_lock(&subs->lock);
	hwptr_done = subs->hwptr_done;
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	substream->runtime->delay = snd_usb_pcm_delay(subs,
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						substream->runtime->rate);
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	spin_unlock(&subs->lock);
	return hwptr_done / (substream->runtime->frame_bits >> 3);
}

/*
 * find a matching audio format
 */
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static struct audioformat *find_format(struct snd_usb_substream *subs)
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{
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	struct audioformat *fp;
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	struct audioformat *found = NULL;
	int cur_attr = 0, attr;

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	list_for_each_entry(fp, &subs->fmt_list, list) {
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		if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
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			continue;
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		if (fp->channels != subs->channels)
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			continue;
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		if (subs->cur_rate < fp->rate_min ||
		    subs->cur_rate > fp->rate_max)
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			continue;
		if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
			unsigned int i;
			for (i = 0; i < fp->nr_rates; i++)
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				if (fp->rate_table[i] == subs->cur_rate)
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					break;
			if (i >= fp->nr_rates)
				continue;
		}
		attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
		if (! found) {
			found = fp;
			cur_attr = attr;
			continue;
		}
		/* avoid async out and adaptive in if the other method
		 * supports the same format.
		 * this is a workaround for the case like
		 * M-audio audiophile USB.
		 */
		if (attr != cur_attr) {
			if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE))
				continue;
			if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
				found = fp;
				cur_attr = attr;
				continue;
			}
		}
		/* find the format with the largest max. packet size */
		if (fp->maxpacksize > found->maxpacksize) {
			found = fp;
			cur_attr = attr;
		}
	}
	return found;
}

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static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned int ep;
	unsigned char data[1];
	int err;

	ep = get_endpoint(alts, 0)->bEndpointAddress;

	data[0] = 1;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
				   USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
				   UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
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				   data, sizeof(data))) < 0) {
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		snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
			   dev->devnum, iface, ep);
		return err;
	}

	return 0;
}
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static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned char data[1];
	int err;

	data[0] = 1;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
				   USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
				   UAC2_EP_CS_PITCH << 8, 0,
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				   data, sizeof(data))) < 0) {
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		snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
			   dev->devnum, iface, fmt->altsetting);
		return err;
	}

	return 0;
}

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/*
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 * initialize the pitch control and sample rate
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 */
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int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
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		       struct usb_host_interface *alts,
		       struct audioformat *fmt)
{
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	/* if endpoint doesn't have pitch control, bail out */
	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
		return 0;

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	switch (fmt->protocol) {
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	case UAC_VERSION_1:
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	default:
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		return init_pitch_v1(chip, iface, alts, fmt);

	case UAC_VERSION_2:
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		return init_pitch_v2(chip, iface, alts, fmt);
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	}
}

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static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
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{
	int err;

	if (!subs->data_endpoint)
		return -EINVAL;

	if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
		struct snd_usb_endpoint *ep = subs->data_endpoint;

		snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);

		ep->data_subs = subs;
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		err = snd_usb_endpoint_start(ep, can_sleep);
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		if (err < 0) {
			clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
			return err;
		}
	}

	if (subs->sync_endpoint &&
	    !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
		struct snd_usb_endpoint *ep = subs->sync_endpoint;

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		if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
		    subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
			err = usb_set_interface(subs->dev,
						subs->sync_endpoint->iface,
						subs->sync_endpoint->alt_idx);
			if (err < 0) {
				snd_printk(KERN_ERR
					   "%d:%d:%d: cannot set interface (%d)\n",
					   subs->dev->devnum,
					   subs->sync_endpoint->iface,
					   subs->sync_endpoint->alt_idx, err);
				return -EIO;
			}
		}

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		snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);

		ep->sync_slave = subs->data_endpoint;
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		err = snd_usb_endpoint_start(ep, can_sleep);
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		if (err < 0) {
			clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
			return err;
		}
	}

	return 0;
}

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static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
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{
	if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
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		snd_usb_endpoint_stop(subs->sync_endpoint);
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	if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
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		snd_usb_endpoint_stop(subs->data_endpoint);

	if (wait) {
		snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
		snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
	}
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}

static int deactivate_endpoints(struct snd_usb_substream *subs)
{
	int reta, retb;

	reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
	retb = snd_usb_endpoint_deactivate(subs->data_endpoint);

	if (reta < 0)
		return reta;

	if (retb < 0)
		return retb;

	return 0;
}

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static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
				     unsigned int altsetting,
				     struct usb_host_interface **alts,
				     unsigned int *ep)
{
	struct usb_interface *iface;
	struct usb_interface_descriptor *altsd;
	struct usb_endpoint_descriptor *epd;

	iface = usb_ifnum_to_if(dev, ifnum);
	if (!iface || iface->num_altsetting < altsetting + 1)
		return -ENOENT;
	*alts = &iface->altsetting[altsetting];
	altsd = get_iface_desc(*alts);
	if (altsd->bAlternateSetting != altsetting ||
	    altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
	    (altsd->bInterfaceSubClass != 2 &&
	     altsd->bInterfaceProtocol != 2   ) ||
	    altsd->bNumEndpoints < 1)
		return -ENOENT;
	epd = get_endpoint(*alts, 0);
	if (!usb_endpoint_is_isoc_in(epd) ||
	    (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
					USB_ENDPOINT_USAGE_IMPLICIT_FB)
		return -ENOENT;
	*ep = epd->bEndpointAddress;
	return 0;
}

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static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
					 struct usb_device *dev,
					 struct usb_interface_descriptor *altsd,
					 unsigned int attr)
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{
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	struct usb_host_interface *alts;
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	struct usb_interface *iface;
	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
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	int implicit_fb = 0;
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	unsigned int ep;
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	switch (subs->stream->chip->usb_id) {
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	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
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	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
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		if (is_playback) {
			implicit_fb = 1;
			ep = 0x81;
			iface = usb_ifnum_to_if(dev, 3);

			if (!iface || iface->num_altsetting == 0)
				return -EINVAL;

			alts = &iface->altsetting[1];
			goto add_sync_ep;
		}
		break;
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	case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
	case USB_ID(0x0763, 0x2081):
		if (is_playback) {
			implicit_fb = 1;
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			ep = 0x81;
			iface = usb_ifnum_to_if(dev, 2);
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			if (!iface || iface->num_altsetting == 0)
				return -EINVAL;

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			alts = &iface->altsetting[1];
			goto add_sync_ep;
		}
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	}
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	if (is_playback &&
	    attr == USB_ENDPOINT_SYNC_ASYNC &&
	    altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
	    altsd->bInterfaceProtocol == 2 &&
	    altsd->bNumEndpoints == 1 &&
	    USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
	    search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
				      altsd->bAlternateSetting,
				      &alts, &ep) >= 0) {
		implicit_fb = 1;
		goto add_sync_ep;
	}
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	/* No quirk */
	return 0;

add_sync_ep:
	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, ep, !subs->direction,
						   implicit_fb ?
							SND_USB_ENDPOINT_TYPE_DATA :
							SND_USB_ENDPOINT_TYPE_SYNC);
	if (!subs->sync_endpoint)
		return -EINVAL;

	subs->data_endpoint->sync_master = subs->sync_endpoint;

	return 0;
}

static int set_sync_endpoint(struct snd_usb_substream *subs,
			     struct audioformat *fmt,
			     struct usb_device *dev,
			     struct usb_host_interface *alts,
			     struct usb_interface_descriptor *altsd)
{
	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
	unsigned int ep, attr;
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	bool implicit_fb;
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	int err;

	/* we need a sync pipe in async OUT or adaptive IN mode */
	/* check the number of EP, since some devices have broken
	 * descriptors which fool us.  if it has only one EP,
	 * assume it as adaptive-out or sync-in.
	 */
	attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;

	err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
	if (err < 0)
		return err;

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	if (altsd->bNumEndpoints < 2)
		return 0;
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	if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) ||
	    (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
		return 0;
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	/* check sync-pipe endpoint */
	/* ... and check descriptor size before accessing bSynchAddress
	   because there is a version of the SB Audigy 2 NX firmware lacking
	   the audio fields in the endpoint descriptors */
	if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
	    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
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	     get_endpoint(alts, 1)->bSynchAddress != 0)) {
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		snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
			   dev->devnum, fmt->iface, fmt->altsetting,
			   get_endpoint(alts, 1)->bmAttributes,
			   get_endpoint(alts, 1)->bLength,
			   get_endpoint(alts, 1)->bSynchAddress);
		return -EINVAL;
	}
	ep = get_endpoint(alts, 1)->bEndpointAddress;
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	if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
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	    ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
	     (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
		snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
			   dev->devnum, fmt->iface, fmt->altsetting,
			   is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
		return -EINVAL;
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	}
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	implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
			== USB_ENDPOINT_USAGE_IMPLICIT_FB;

	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, ep, !subs->direction,
						   implicit_fb ?
							SND_USB_ENDPOINT_TYPE_DATA :
							SND_USB_ENDPOINT_TYPE_SYNC);
	if (!subs->sync_endpoint)
		return -EINVAL;

	subs->data_endpoint->sync_master = subs->sync_endpoint;

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	return 0;
}

/*
 * find a matching format and set up the interface
 */
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
{
	struct usb_device *dev = subs->dev;
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct usb_interface *iface;
	int err;

	iface = usb_ifnum_to_if(dev, fmt->iface);
	if (WARN_ON(!iface))
		return -EINVAL;
	alts = &iface->altsetting[fmt->altset_idx];
	altsd = get_iface_desc(alts);
	if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
		return -EINVAL;

	if (fmt == subs->cur_audiofmt)
		return 0;

	/* close the old interface */
	if (subs->interface >= 0 && subs->interface != fmt->iface) {
		err = usb_set_interface(subs->dev, subs->interface, 0);
		if (err < 0) {
			snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
				dev->devnum, fmt->iface, fmt->altsetting, err);
			return -EIO;
		}
		subs->interface = -1;
		subs->altset_idx = 0;
	}

	/* set interface */
	if (subs->interface != fmt->iface ||
	    subs->altset_idx != fmt->altset_idx) {
		err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
		if (err < 0) {
			snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
				   dev->devnum, fmt->iface, fmt->altsetting, err);
			return -EIO;
		}
		snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
				fmt->iface, fmt->altsetting);
		subs->interface = fmt->iface;
		subs->altset_idx = fmt->altset_idx;

		snd_usb_set_interface_quirk(dev);
	}

	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, fmt->endpoint, subs->direction,
						   SND_USB_ENDPOINT_TYPE_DATA);

	if (!subs->data_endpoint)
		return -EINVAL;

	err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
	if (err < 0)
		return err;

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	err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
	if (err < 0)
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		return err;

	subs->cur_audiofmt = fmt;

	snd_usb_set_format_quirk(subs, fmt);

	return 0;
}

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/*
 * Return the score of matching two audioformats.
 * Veto the audioformat if:
 * - It has no channels for some reason.
 * - Requested PCM format is not supported.
 * - Requested sample rate is not supported.
 */
static int match_endpoint_audioformats(struct audioformat *fp,
	struct audioformat *match, int rate,
	snd_pcm_format_t pcm_format)
{
	int i;
	int score = 0;

	if (fp->channels < 1) {
		snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp);
		return 0;
	}

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	if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
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		snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__,
			fp, pcm_format);
		return 0;
	}

	for (i = 0; i < fp->nr_rates; i++) {
		if (fp->rate_table[i] == rate) {
			score++;
			break;
		}
	}
	if (!score) {
		snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__,
			fp, rate);
		return 0;
	}

	if (fp->channels == match->channels)
		score++;

	snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score);

	return score;
}

/*
 * Configure the sync ep using the rate and pcm format of the data ep.
 */
static int configure_sync_endpoint(struct snd_usb_substream *subs)
{
	int ret;
	struct audioformat *fp;
	struct audioformat *sync_fp = NULL;
	int cur_score = 0;
	int sync_period_bytes = subs->period_bytes;
	struct snd_usb_substream *sync_subs =
		&subs->stream->substream[subs->direction ^ 1];

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	if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
	    !subs->stream)
		return snd_usb_endpoint_set_params(subs->sync_endpoint,
						   subs->pcm_format,
						   subs->channels,
						   subs->period_bytes,
						   subs->cur_rate,
						   subs->cur_audiofmt,
						   NULL);

610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648
	/* Try to find the best matching audioformat. */
	list_for_each_entry(fp, &sync_subs->fmt_list, list) {
		int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
			subs->cur_rate, subs->pcm_format);

		if (score > cur_score) {
			sync_fp = fp;
			cur_score = score;
		}
	}

	if (unlikely(sync_fp == NULL)) {
		snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
			__func__, sync_subs->ep_num);
		return -EINVAL;
	}

	/*
	 * Recalculate the period bytes if channel number differ between
	 * data and sync ep audioformat.
	 */
	if (sync_fp->channels != subs->channels) {
		sync_period_bytes = (subs->period_bytes / subs->channels) *
			sync_fp->channels;
		snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
			__func__, subs->period_bytes, sync_period_bytes);
	}

	ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
					  subs->pcm_format,
					  sync_fp->channels,
					  sync_period_bytes,
					  subs->cur_rate,
					  sync_fp,
					  NULL);

	return ret;
}

649 650 651 652 653 654 655 656 657 658
/*
 * configure endpoint params
 *
 * called  during initial setup and upon resume
 */
static int configure_endpoint(struct snd_usb_substream *subs)
{
	int ret;

	/* format changed */
659
	stop_endpoints(subs, true);
660 661 662 663 664 665 666 667
	ret = snd_usb_endpoint_set_params(subs->data_endpoint,
					  subs->pcm_format,
					  subs->channels,
					  subs->period_bytes,
					  subs->cur_rate,
					  subs->cur_audiofmt,
					  subs->sync_endpoint);
	if (ret < 0)
668
		return ret;
669 670

	if (subs->sync_endpoint)
671 672
		ret = configure_sync_endpoint(subs);

673 674 675
	return ret;
}

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/*
 * hw_params callback
 *
 * allocate a buffer and set the given audio format.
 *
 * 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.
 */
static int snd_usb_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *hw_params)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;
	struct audioformat *fmt;
691
	int ret;
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	ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
					       params_buffer_bytes(hw_params));
	if (ret < 0)
		return ret;

698 699 700 701 702 703
	subs->pcm_format = params_format(hw_params);
	subs->period_bytes = params_period_bytes(hw_params);
	subs->channels = params_channels(hw_params);
	subs->cur_rate = params_rate(hw_params);

	fmt = find_format(subs);
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	if (!fmt) {
		snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
706
			   subs->pcm_format, subs->cur_rate, subs->channels);
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		return -EINVAL;
	}

710
	down_read(&subs->stream->chip->shutdown_rwsem);
711 712 713 714
	if (subs->stream->chip->shutdown)
		ret = -ENODEV;
	else
		ret = set_format(subs, fmt);
715
	up_read(&subs->stream->chip->shutdown_rwsem);
716
	if (ret < 0)
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		return ret;

719 720
	subs->interface = fmt->iface;
	subs->altset_idx = fmt->altset_idx;
721
	subs->need_setup_ep = true;
722

723
	return 0;
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}

/*
 * hw_free callback
 *
 * reset the audio format and release the buffer
 */
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	subs->cur_audiofmt = NULL;
	subs->cur_rate = 0;
	subs->period_bytes = 0;
738
	down_read(&subs->stream->chip->shutdown_rwsem);
739
	if (!subs->stream->chip->shutdown) {
740
		stop_endpoints(subs, true);
741 742
		deactivate_endpoints(subs);
	}
743
	up_read(&subs->stream->chip->shutdown_rwsem);
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	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

/*
 * prepare callback
 *
 * only a few subtle things...
 */
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = runtime->private_data;
756 757 758
	struct usb_host_interface *alts;
	struct usb_interface *iface;
	int ret;
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	if (! subs->cur_audiofmt) {
		snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
		return -ENXIO;
	}

765
	down_read(&subs->stream->chip->shutdown_rwsem);
766 767 768 769 770 771 772 773
	if (subs->stream->chip->shutdown) {
		ret = -ENODEV;
		goto unlock;
	}
	if (snd_BUG_ON(!subs->data_endpoint)) {
		ret = -EIO;
		goto unlock;
	}
774

775 776 777
	snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
	snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);

778 779
	ret = set_format(subs, subs->cur_audiofmt);
	if (ret < 0)
780
		goto unlock;
781 782 783 784 785 786 787 788 789

	iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
	alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
	ret = snd_usb_init_sample_rate(subs->stream->chip,
				       subs->cur_audiofmt->iface,
				       alts,
				       subs->cur_audiofmt,
				       subs->cur_rate);
	if (ret < 0)
790
		goto unlock;
791

792 793 794
	if (subs->need_setup_ep) {
		ret = configure_endpoint(subs);
		if (ret < 0)
795
			goto unlock;
796 797
		subs->need_setup_ep = false;
	}
798

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	/* some unit conversions in runtime */
800 801 802 803
	subs->data_endpoint->maxframesize =
		bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
	subs->data_endpoint->curframesize =
		bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
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	/* reset the pointer */
	subs->hwptr_done = 0;
	subs->transfer_done = 0;
808 809
	subs->last_delay = 0;
	subs->last_frame_number = 0;
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	runtime->delay = 0;

812 813 814
	/* for playback, submit the URBs now; otherwise, the first hwptr_done
	 * updates for all URBs would happen at the same time when starting */
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
815
		ret = start_endpoints(subs, true);
816

817
 unlock:
818
	up_read(&subs->stream->chip->shutdown_rwsem);
819
	return ret;
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}

static struct snd_pcm_hardware snd_usb_hardware =
{
	.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_PAUSE,
	.buffer_bytes_max =	1024 * 1024,
	.period_bytes_min =	64,
	.period_bytes_max =	512 * 1024,
	.periods_min =		2,
	.periods_max =		1024,
};

static int hw_check_valid_format(struct snd_usb_substream *subs,
				 struct snd_pcm_hw_params *params,
				 struct audioformat *fp)
{
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
845
	struct snd_mask check_fmts;
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	unsigned int ptime;

	/* check the format */
849 850 851 852 853
	snd_mask_none(&check_fmts);
	check_fmts.bits[0] = (u32)fp->formats;
	check_fmts.bits[1] = (u32)(fp->formats >> 32);
	snd_mask_intersect(&check_fmts, fmts);
	if (snd_mask_empty(&check_fmts)) {
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		hwc_debug("   > check: no supported format %d\n", fp->format);
		return 0;
	}
	/* check the channels */
	if (fp->channels < ct->min || fp->channels > ct->max) {
		hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
		return 0;
	}
	/* check the rate is within the range */
	if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
		hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
		return 0;
	}
	if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
		hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
		return 0;
	}
	/* check whether the period time is >= the data packet interval */
872
	if (subs->speed != USB_SPEED_FULL) {
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		ptime = 125 * (1 << fp->datainterval);
		if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
			hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
			return 0;
		}
	}
	return 1;
}

static int hw_rule_rate(struct snd_pcm_hw_params *params,
			struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
886
	struct audioformat *fp;
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	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
894
	list_for_each_entry(fp, &subs->fmt_list, list) {
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Daniel Mack 已提交
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		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->rate_min)
				rmin = fp->rate_min;
			if (rmax < fp->rate_max)
				rmax = fp->rate_max;
		} else {
			rmin = fp->rate_min;
			rmax = fp->rate_max;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}


static int hw_rule_channels(struct snd_pcm_hw_params *params,
			    struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
938
	struct audioformat *fp;
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Daniel Mack 已提交
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	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
946
	list_for_each_entry(fp, &subs->fmt_list, list) {
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Daniel Mack 已提交
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		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->channels)
				rmin = fp->channels;
			if (rmax < fp->channels)
				rmax = fp->channels;
		} else {
			rmin = fp->channels;
			rmax = fp->channels;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

static int hw_rule_format(struct snd_pcm_hw_params *params,
			  struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
989
	struct audioformat *fp;
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Daniel Mack 已提交
990 991 992 993 994 995 996
	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	u64 fbits;
	u32 oldbits[2];
	int changed;

	hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
	fbits = 0;
997
	list_for_each_entry(fp, &subs->fmt_list, list) {
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Daniel Mack 已提交
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		if (!hw_check_valid_format(subs, params, fp))
			continue;
1000
		fbits |= fp->formats;
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Daniel Mack 已提交
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
	}

	oldbits[0] = fmt->bits[0];
	oldbits[1] = fmt->bits[1];
	fmt->bits[0] &= (u32)fbits;
	fmt->bits[1] &= (u32)(fbits >> 32);
	if (!fmt->bits[0] && !fmt->bits[1]) {
		hwc_debug("  --> get empty\n");
		return -EINVAL;
	}
	changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
	hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
	return changed;
}

static int hw_rule_period_time(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct audioformat *fp;
	struct snd_interval *it;
	unsigned char min_datainterval;
	unsigned int pmin;
	int changed;

	it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
	hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
	min_datainterval = 0xff;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		min_datainterval = min(min_datainterval, fp->datainterval);
	}
	if (min_datainterval == 0xff) {
1035
		hwc_debug("  --> get empty\n");
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Daniel Mack 已提交
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
		it->empty = 1;
		return -EINVAL;
	}
	pmin = 125 * (1 << min_datainterval);
	changed = 0;
	if (it->min < pmin) {
		it->min = pmin;
		it->openmin = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

/*
 *  If the device supports unusual bit rates, does the request meet these?
 */
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
				  struct snd_usb_substream *subs)
{
	struct audioformat *fp;
1061
	int *rate_list;
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Daniel Mack 已提交
1062 1063 1064
	int count = 0, needs_knot = 0;
	int err;

1065 1066 1067
	kfree(subs->rate_list.list);
	subs->rate_list.list = NULL;

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Daniel Mack 已提交
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
			return 0;
		count += fp->nr_rates;
		if (fp->rates & SNDRV_PCM_RATE_KNOT)
			needs_knot = 1;
	}
	if (!needs_knot)
		return 0;

1078 1079
	subs->rate_list.list = rate_list =
		kmalloc(sizeof(int) * count, GFP_KERNEL);
1080 1081 1082
	if (!subs->rate_list.list)
		return -ENOMEM;
	subs->rate_list.count = count;
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Daniel Mack 已提交
1083 1084 1085 1086 1087
	subs->rate_list.mask = 0;
	count = 0;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		int i;
		for (i = 0; i < fp->nr_rates; i++)
1088
			rate_list[count++] = fp->rate_table[i];
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Daniel Mack 已提交
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
	}
	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
					 &subs->rate_list);
	if (err < 0)
		return err;

	return 0;
}


/*
 * set up the runtime hardware information.
 */

static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
{
1105
	struct audioformat *fp;
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Daniel Mack 已提交
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
	unsigned int pt, ptmin;
	int param_period_time_if_needed;
	int err;

	runtime->hw.formats = subs->formats;

	runtime->hw.rate_min = 0x7fffffff;
	runtime->hw.rate_max = 0;
	runtime->hw.channels_min = 256;
	runtime->hw.channels_max = 0;
	runtime->hw.rates = 0;
	ptmin = UINT_MAX;
	/* check min/max rates and channels */
1119
	list_for_each_entry(fp, &subs->fmt_list, list) {
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Daniel Mack 已提交
1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
		runtime->hw.rates |= fp->rates;
		if (runtime->hw.rate_min > fp->rate_min)
			runtime->hw.rate_min = fp->rate_min;
		if (runtime->hw.rate_max < fp->rate_max)
			runtime->hw.rate_max = fp->rate_max;
		if (runtime->hw.channels_min > fp->channels)
			runtime->hw.channels_min = fp->channels;
		if (runtime->hw.channels_max < fp->channels)
			runtime->hw.channels_max = fp->channels;
		if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
			/* FIXME: there might be more than one audio formats... */
			runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
				fp->frame_size;
		}
		pt = 125 * (1 << fp->datainterval);
		ptmin = min(ptmin, pt);
	}
1137 1138 1139
	err = snd_usb_autoresume(subs->stream->chip);
	if (err < 0)
		return err;
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Daniel Mack 已提交
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	param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1142
	if (subs->speed == USB_SPEED_FULL)
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Daniel Mack 已提交
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
		/* full speed devices have fixed data packet interval */
		ptmin = 1000;
	if (ptmin == 1000)
		/* if period time doesn't go below 1 ms, no rules needed */
		param_period_time_if_needed = -1;
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
				     ptmin, UINT_MAX);

	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				       hw_rule_rate, subs,
				       SNDRV_PCM_HW_PARAM_FORMAT,
				       SNDRV_PCM_HW_PARAM_CHANNELS,
				       param_period_time_if_needed,
				       -1)) < 0)
1157
		goto rep_err;
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Daniel Mack 已提交
1158 1159 1160 1161 1162 1163
	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				       hw_rule_channels, subs,
				       SNDRV_PCM_HW_PARAM_FORMAT,
				       SNDRV_PCM_HW_PARAM_RATE,
				       param_period_time_if_needed,
				       -1)) < 0)
1164
		goto rep_err;
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Daniel Mack 已提交
1165 1166 1167 1168 1169 1170
	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
				       hw_rule_format, subs,
				       SNDRV_PCM_HW_PARAM_RATE,
				       SNDRV_PCM_HW_PARAM_CHANNELS,
				       param_period_time_if_needed,
				       -1)) < 0)
1171
		goto rep_err;
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Daniel Mack 已提交
1172 1173 1174 1175 1176 1177 1178 1179 1180
	if (param_period_time_if_needed >= 0) {
		err = snd_pcm_hw_rule_add(runtime, 0,
					  SNDRV_PCM_HW_PARAM_PERIOD_TIME,
					  hw_rule_period_time, subs,
					  SNDRV_PCM_HW_PARAM_FORMAT,
					  SNDRV_PCM_HW_PARAM_CHANNELS,
					  SNDRV_PCM_HW_PARAM_RATE,
					  -1);
		if (err < 0)
1181
			goto rep_err;
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1182 1183
	}
	if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1184
		goto rep_err;
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1185
	return 0;
1186 1187 1188 1189

rep_err:
	snd_usb_autosuspend(subs->stream->chip);
	return err;
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}

static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
{
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = &as->substream[direction];

	subs->interface = -1;
1199
	subs->altset_idx = 0;
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	runtime->hw = snd_usb_hardware;
	runtime->private_data = subs;
	subs->pcm_substream = substream;
1203
	/* runtime PM is also done there */
1204 1205 1206 1207 1208 1209

	/* initialize DSD/DOP context */
	subs->dsd_dop.byte_idx = 0;
	subs->dsd_dop.channel = 0;
	subs->dsd_dop.marker = 1;

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	return setup_hw_info(runtime, subs);
}

static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
{
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_usb_substream *subs = &as->substream[direction];

1218
	stop_endpoints(subs, true);
1219 1220 1221 1222 1223 1224

	if (!as->chip->shutdown && subs->interface >= 0) {
		usb_set_interface(subs->dev, subs->interface, 0);
		subs->interface = -1;
	}

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1225
	subs->pcm_substream = NULL;
1226
	snd_usb_autosuspend(subs->stream->chip);
1227

1228
	return 0;
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
}

/* Since a URB can handle only a single linear buffer, we must use double
 * buffering when the data to be transferred overflows the buffer boundary.
 * To avoid inconsistencies when updating hwptr_done, we use double buffering
 * for all URBs.
 */
static void retire_capture_urb(struct snd_usb_substream *subs,
			       struct urb *urb)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	unsigned int stride, frames, bytes, oldptr;
	int i, period_elapsed = 0;
	unsigned long flags;
	unsigned char *cp;
1244 1245 1246 1247
	int current_frame_number;

	/* read frame number here, update pointer in critical section */
	current_frame_number = usb_get_current_frame_number(subs->dev);
1248 1249 1250 1251

	stride = runtime->frame_bits >> 3;

	for (i = 0; i < urb->number_of_packets; i++) {
1252
		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
		if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
			snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
			// continue;
		}
		bytes = urb->iso_frame_desc[i].actual_length;
		frames = bytes / stride;
		if (!subs->txfr_quirk)
			bytes = frames * stride;
		if (bytes % (runtime->sample_bits >> 3) != 0) {
			int oldbytes = bytes;
			bytes = frames * stride;
			snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
							oldbytes, bytes);
		}
		/* update the current pointer */
		spin_lock_irqsave(&subs->lock, flags);
		oldptr = subs->hwptr_done;
		subs->hwptr_done += bytes;
		if (subs->hwptr_done >= runtime->buffer_size * stride)
			subs->hwptr_done -= runtime->buffer_size * stride;
		frames = (bytes + (oldptr % stride)) / stride;
		subs->transfer_done += frames;
		if (subs->transfer_done >= runtime->period_size) {
			subs->transfer_done -= runtime->period_size;
			period_elapsed = 1;
		}
1279 1280 1281 1282 1283 1284 1285 1286 1287
		/* capture delay is by construction limited to one URB,
		 * reset delays here
		 */
		runtime->delay = subs->last_delay = 0;

		/* realign last_frame_number */
		subs->last_frame_number = current_frame_number;
		subs->last_frame_number &= 0xFF; /* keep 8 LSBs */

1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
		spin_unlock_irqrestore(&subs->lock, flags);
		/* copy a data chunk */
		if (oldptr + bytes > runtime->buffer_size * stride) {
			unsigned int bytes1 =
					runtime->buffer_size * stride - oldptr;
			memcpy(runtime->dma_area + oldptr, cp, bytes1);
			memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
		} else {
			memcpy(runtime->dma_area + oldptr, cp, bytes);
		}
	}

	if (period_elapsed)
		snd_pcm_period_elapsed(subs->pcm_substream);
}

1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
					     struct urb *urb, unsigned int bytes)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	unsigned int stride = runtime->frame_bits >> 3;
	unsigned int dst_idx = 0;
	unsigned int src_idx = subs->hwptr_done;
	unsigned int wrap = runtime->buffer_size * stride;
	u8 *dst = urb->transfer_buffer;
	u8 *src = runtime->dma_area;
	u8 marker[] = { 0x05, 0xfa };

	/*
	 * The DSP DOP format defines a way to transport DSD samples over
	 * normal PCM data endpoints. It requires stuffing of marker bytes
	 * (0x05 and 0xfa, alternating per sample frame), and then expects
	 * 2 additional bytes of actual payload. The whole frame is stored
	 * LSB.
	 *
	 * Hence, for a stereo transport, the buffer layout looks like this,
	 * where L refers to left channel samples and R to right.
	 *
	 *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
	 *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
	 *   .....
	 *
	 */

	while (bytes--) {
		if (++subs->dsd_dop.byte_idx == 3) {
			/* frame boundary? */
			dst[dst_idx++] = marker[subs->dsd_dop.marker];
			src_idx += 2;
			subs->dsd_dop.byte_idx = 0;

			if (++subs->dsd_dop.channel % runtime->channels == 0) {
				/* alternate the marker */
				subs->dsd_dop.marker++;
				subs->dsd_dop.marker %= ARRAY_SIZE(marker);
				subs->dsd_dop.channel = 0;
			}
		} else {
			/* stuff the DSD payload */
			int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1348 1349 1350 1351 1352 1353

			if (subs->cur_audiofmt->dsd_bitrev)
				dst[dst_idx++] = bitrev8(src[idx]);
			else
				dst[dst_idx++] = src[idx];

1354 1355 1356 1357 1358
			subs->hwptr_done++;
		}
	}
}

1359 1360 1361 1362
static void prepare_playback_urb(struct snd_usb_substream *subs,
				 struct urb *urb)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1363
	struct snd_usb_endpoint *ep = subs->data_endpoint;
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
	struct snd_urb_ctx *ctx = urb->context;
	unsigned int counts, frames, bytes;
	int i, stride, period_elapsed = 0;
	unsigned long flags;

	stride = runtime->frame_bits >> 3;

	frames = 0;
	urb->number_of_packets = 0;
	spin_lock_irqsave(&subs->lock, flags);
	for (i = 0; i < ctx->packets; i++) {
1375 1376 1377 1378 1379
		if (ctx->packet_size[i])
			counts = ctx->packet_size[i];
		else
			counts = snd_usb_endpoint_next_packet_size(ep);

1380
		/* set up descriptor */
1381 1382
		urb->iso_frame_desc[i].offset = frames * ep->stride;
		urb->iso_frame_desc[i].length = counts * ep->stride;
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
		frames += counts;
		urb->number_of_packets++;
		subs->transfer_done += counts;
		if (subs->transfer_done >= runtime->period_size) {
			subs->transfer_done -= runtime->period_size;
			period_elapsed = 1;
			if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
				if (subs->transfer_done > 0) {
					/* FIXME: fill-max mode is not
					 * supported yet */
					frames -= subs->transfer_done;
					counts -= subs->transfer_done;
					urb->iso_frame_desc[i].length =
1396
						counts * ep->stride;
1397 1398 1399 1400 1401 1402
					subs->transfer_done = 0;
				}
				i++;
				if (i < ctx->packets) {
					/* add a transfer delimiter */
					urb->iso_frame_desc[i].offset =
1403
						frames * ep->stride;
1404 1405 1406 1407 1408 1409 1410
					urb->iso_frame_desc[i].length = 0;
					urb->number_of_packets++;
				}
				break;
			}
		}
		if (period_elapsed &&
1411
		    !snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1412 1413
			break;
	}
1414
	bytes = frames * ep->stride;
1415 1416 1417 1418

	if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
		     subs->cur_audiofmt->dsd_dop)) {
		fill_playback_urb_dsd_dop(subs, urb, bytes);
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429
	} else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
			   subs->cur_audiofmt->dsd_bitrev)) {
		/* bit-reverse the bytes */
		u8 *buf = urb->transfer_buffer;
		for (i = 0; i < bytes; i++) {
			int idx = (subs->hwptr_done + i)
				% (runtime->buffer_size * stride);
			buf[i] = bitrev8(runtime->dma_area[idx]);
		}

		subs->hwptr_done += bytes;
1430
	} else {
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
		/* usual PCM */
		if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
			/* err, the transferred area goes over buffer boundary. */
			unsigned int bytes1 =
				runtime->buffer_size * stride - subs->hwptr_done;
			memcpy(urb->transfer_buffer,
			       runtime->dma_area + subs->hwptr_done, bytes1);
			memcpy(urb->transfer_buffer + bytes1,
			       runtime->dma_area, bytes - bytes1);
		} else {
			memcpy(urb->transfer_buffer,
			       runtime->dma_area + subs->hwptr_done, bytes);
		}

		subs->hwptr_done += bytes;
1446
	}
1447

1448 1449
	if (subs->hwptr_done >= runtime->buffer_size * stride)
		subs->hwptr_done -= runtime->buffer_size * stride;
1450 1451 1452

	/* update delay with exact number of samples queued */
	runtime->delay = subs->last_delay;
1453
	runtime->delay += frames;
1454 1455 1456 1457 1458 1459
	subs->last_delay = runtime->delay;

	/* realign last_frame_number */
	subs->last_frame_number = usb_get_current_frame_number(subs->dev);
	subs->last_frame_number &= 0xFF; /* keep 8 LSBs */

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
	spin_unlock_irqrestore(&subs->lock, flags);
	urb->transfer_buffer_length = bytes;
	if (period_elapsed)
		snd_pcm_period_elapsed(subs->pcm_substream);
}

/*
 * process after playback data complete
 * - decrease the delay count again
 */
static void retire_playback_urb(struct snd_usb_substream *subs,
			       struct urb *urb)
{
	unsigned long flags;
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1475 1476
	struct snd_usb_endpoint *ep = subs->data_endpoint;
	int processed = urb->transfer_buffer_length / ep->stride;
1477
	int est_delay;
1478

1479 1480 1481 1482 1483 1484
	/* ignore the delay accounting when procssed=0 is given, i.e.
	 * silent payloads are procssed before handling the actual data
	 */
	if (!processed)
		return;

1485
	spin_lock_irqsave(&subs->lock, flags);
1486 1487 1488
	if (!subs->last_delay)
		goto out; /* short path */

1489 1490 1491 1492
	est_delay = snd_usb_pcm_delay(subs, runtime->rate);
	/* update delay with exact number of samples played */
	if (processed > subs->last_delay)
		subs->last_delay = 0;
1493
	else
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
		subs->last_delay -= processed;
	runtime->delay = subs->last_delay;

	/*
	 * Report when delay estimate is off by more than 2ms.
	 * The error should be lower than 2ms since the estimate relies
	 * on two reads of a counter updated every ms.
	 */
	if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
		snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
			est_delay, subs->last_delay);

1506 1507 1508 1509 1510 1511 1512 1513 1514
	if (!subs->running) {
		/* update last_frame_number for delay counting here since
		 * prepare_playback_urb won't be called during pause
		 */
		subs->last_frame_number =
			usb_get_current_frame_number(subs->dev) & 0xff;
	}

 out:
1515
	spin_unlock_irqrestore(&subs->lock, flags);
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1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537
}

static int snd_usb_playback_open(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_playback_close(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_capture_open(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
}

static int snd_usb_capture_close(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
}

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
					      int cmd)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
		subs->data_endpoint->retire_data_urb = retire_playback_urb;
1548
		subs->running = 1;
1549 1550
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
1551
		stop_endpoints(subs, false);
1552
		subs->running = 0;
1553 1554 1555
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->prepare_data_urb = NULL;
1556 1557
		/* keep retire_data_urb for delay calculation */
		subs->data_endpoint->retire_data_urb = retire_playback_urb;
1558
		subs->running = 0;
1559 1560 1561 1562 1563 1564
		return 0;
	}

	return -EINVAL;
}

1565 1566
static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
					     int cmd)
1567 1568 1569 1570 1571 1572
{
	int err;
	struct snd_usb_substream *subs = substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
1573
		err = start_endpoints(subs, false);
1574 1575 1576 1577
		if (err < 0)
			return err;

		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1578
		subs->running = 1;
1579 1580
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
1581
		stop_endpoints(subs, false);
1582
		subs->running = 0;
1583 1584 1585
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->retire_data_urb = NULL;
1586
		subs->running = 0;
1587 1588 1589
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1590
		subs->running = 1;
1591 1592 1593 1594 1595 1596
		return 0;
	}

	return -EINVAL;
}

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static struct snd_pcm_ops snd_usb_playback_ops = {
	.open =		snd_usb_playback_open,
	.close =	snd_usb_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_playback_trigger,
	.pointer =	snd_usb_pcm_pointer,
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
};

static struct snd_pcm_ops snd_usb_capture_ops = {
	.open =		snd_usb_capture_open,
	.close =	snd_usb_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_capture_trigger,
	.pointer =	snd_usb_pcm_pointer,
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
};

void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
{
	snd_pcm_set_ops(pcm, stream,
			stream == SNDRV_PCM_STREAM_PLAYBACK ?
			&snd_usb_playback_ops : &snd_usb_capture_ops);
}