Merge branch 'topic/usb-endpoint' into topic/misc (56599bb0) · Commits · jan.koester / Linux

sound/usb/card.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -131,8 +131,9 @@ static void snd_usb_stream_disconnect(struct list_head *head)
		subs = &as->substream[idx];
		if (!subs->num_formats)
		continue;
		snd_usb_release_substream_urbs(subs, 1);
		subs->interface = -1;
		subs->data_endpoint = NULL;
		subs->sync_endpoint = NULL;
		}
		}

		@@ -276,6 +277,7 @@ static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)

		static int snd_usb_audio_free(struct snd_usb_audio *chip)
		{
		mutex_destroy(&chip->mutex);
		kfree(chip);
		return 0;
		}
		@@ -336,6 +338,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
		return -ENOMEM;
		}

		mutex_init(&chip->mutex);
		mutex_init(&chip->shutdown_mutex);
		chip->index = idx;
		chip->dev = dev;
		@@ -348,6 +351,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
		chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
		le16_to_cpu(dev->descriptor.idProduct));
		INIT_LIST_HEAD(&chip->pcm_list);
		INIT_LIST_HEAD(&chip->ep_list);
		INIT_LIST_HEAD(&chip->midi_list);
		INIT_LIST_HEAD(&chip->mixer_list);

		@@ -565,6 +569,10 @@ static void snd_usb_audio_disconnect(struct usb_device *dev,
		list_for_each(p, &chip->pcm_list) {
		snd_usb_stream_disconnect(p);
		}
		/* release the endpoint resources */
		list_for_each(p, &chip->ep_list) {
		snd_usb_endpoint_free(p);
		}
		/* release the midi resources */
		list_for_each(p, &chip->midi_list) {
		snd_usbmidi_disconnect(p);

sound/usb/card.h

+62 −15

Original line number	Diff line number	Diff line
		@@ -30,13 +30,17 @@ struct audioformat {
		};

		struct snd_usb_substream;
		struct snd_usb_endpoint;

		struct snd_urb_ctx {
		struct urb *urb;
		unsigned int buffer_size; /* size of data buffer, if data URB */
		struct snd_usb_substream *subs;
		struct snd_usb_endpoint *ep;
		int index; /* index for urb array */
		int packets; /* number of packets per urb */
		int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
		struct list_head ready_list;
		};

		struct snd_urb_ops {
		@@ -46,21 +50,39 @@ struct snd_urb_ops {
		int (retire_sync)(struct snd_usb_substream subs, struct snd_pcm_runtime runtime, struct urb u);
		};

		struct snd_usb_substream {
		struct snd_usb_stream *stream;
		struct usb_device *dev;
		struct snd_pcm_substream *pcm_substream;
		int direction; /* playback or capture */
		int interface; /* current interface */
		int endpoint; /* assigned endpoint */
		struct audioformat cur_audiofmt; / current audioformat pointer (for hw_params callback) */
		unsigned int cur_rate; /* current rate (for hw_params callback) */
		unsigned int period_bytes; /* current period bytes (for hw_params callback) */
		unsigned int altset_idx; /* USB data format: index of alternate setting */
		unsigned int datapipe; /* the data i/o pipe */
		unsigned int syncpipe; /* 1 - async out or adaptive in */
		unsigned int datainterval; /* log_2 of data packet interval */
		unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
		struct snd_usb_endpoint {
		struct snd_usb_audio *chip;

		int use_count;
		int ep_num; /* the referenced endpoint number */
		int type; /* SND_USB_ENDPOINT_TYPE_* */
		unsigned long flags;

		void (prepare_data_urb) (struct snd_usb_substream subs,
		struct urb *urb);
		void (retire_data_urb) (struct snd_usb_substream subs,
		struct urb *urb);

		struct snd_usb_substream *data_subs;
		struct snd_usb_endpoint *sync_master;
		struct snd_usb_endpoint *sync_slave;

		struct snd_urb_ctx urb[MAX_URBS];

		struct snd_usb_packet_info {
		uint32_t packet_size[MAX_PACKS_HS];
		int packets;
		} next_packet[MAX_URBS];
		int next_packet_read_pos, next_packet_write_pos;
		struct list_head ready_playback_urbs;

		unsigned int nurbs; /* # urbs */
		unsigned long active_mask; /* bitmask of active urbs */
		unsigned long unlink_mask; /* bitmask of unlinked urbs */
		char syncbuf; / sync buffer for all sync URBs */
		dma_addr_t sync_dma; /* DMA address of syncbuf */

		unsigned int pipe; /* the data i/o pipe */
		unsigned int freqn; /* nominal sampling rate in fs/fps in Q16.16 format */
		unsigned int freqm; /* momentary sampling rate in fs/fps in Q16.16 format */
		int freqshift; /* how much to shift the feedback value to get Q16.16 */
		@@ -72,6 +94,27 @@ struct snd_usb_substream {
		unsigned int curframesize; /* current packet size in frames (for capture) */
		unsigned int syncmaxsize; /* sync endpoint packet size */
		unsigned int fill_max:1; /* fill max packet size always */
		unsigned int datainterval; /* log_2 of data packet interval */
		unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
		unsigned char silence_value;
		unsigned int stride;
		int iface, alt_idx;

		spinlock_t lock;
		struct list_head list;
		};

		struct snd_usb_substream {
		struct snd_usb_stream *stream;
		struct usb_device *dev;
		struct snd_pcm_substream *pcm_substream;
		int direction; /* playback or capture */
		int interface; /* current interface */
		int endpoint; /* assigned endpoint */
		struct audioformat cur_audiofmt; / current audioformat pointer (for hw_params callback) */
		unsigned int cur_rate; /* current rate (for hw_params callback) */
		unsigned int period_bytes; /* current period bytes (for hw_params callback) */
		unsigned int altset_idx; /* USB data format: index of alternate setting */
		unsigned int txfr_quirk:1; /* allow sub-frame alignment */
		unsigned int fmt_type; /* USB audio format type (1-3) */

		@@ -87,6 +130,10 @@ struct snd_usb_substream {
		struct snd_urb_ctx syncurb[SYNC_URBS]; /* sync urb table */
		char syncbuf; / sync buffer for all sync URBs */
		dma_addr_t sync_dma; /* DMA address of syncbuf */
		/* data and sync endpoints for this stream */
		struct snd_usb_endpoint *data_endpoint;
		struct snd_usb_endpoint *sync_endpoint;
		unsigned long flags;

		u64 formats; /* format bitmasks (all or'ed) */
		unsigned int num_formats; /* number of supported audio formats (list) */

sound/usb/endpoint.c

+894 −707

File changed.

Preview size limit exceeded, changes collapsed.

sound/usb/endpoint.h

+20 −12

Original line number	Diff line number	Diff line
		#ifndef __USBAUDIO_ENDPOINT_H
		#define __USBAUDIO_ENDPOINT_H

		void snd_usb_init_substream(struct snd_usb_stream *as,
		int stream,
		struct audioformat *fp);
		#define SND_USB_ENDPOINT_TYPE_DATA 0
		#define SND_USB_ENDPOINT_TYPE_SYNC 1

		int snd_usb_init_substream_urbs(struct snd_usb_substream *subs,
		unsigned int period_bytes,
		unsigned int rate,
		unsigned int frame_bits);
		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);

		void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force);
		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 snd_usb_substream_prepare(struct snd_usb_substream *subs,
		struct snd_pcm_runtime *runtime);
		int snd_usb_endpoint_start(struct snd_usb_endpoint *ep);
		void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep,
		int force, int can_sleep, int wait);
		int snd_usb_endpoint_activate(struct snd_usb_endpoint *ep);
		int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep);
		void snd_usb_endpoint_free(struct list_head *head);

		int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd);
		int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd);
		int snd_usb_endpoint_implict_feedback_sink(struct snd_usb_endpoint *ep);

		void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
		struct snd_usb_endpoint *sender,
		const struct urb *urb);

		#endif /* __USBAUDIO_ENDPOINT_H */

sound/usb/pcm.c

+365 −76

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@

		#include <linux/init.h>
		#include <linux/slab.h>
		#include <linux/ratelimit.h>
		#include <linux/usb.h>
		#include <linux/usb/audio.h>
		#include <linux/usb/audio-v2.h>
		@@ -34,6 +35,9 @@
		#include "clock.h"
		#include "power.h"

		#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
		#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1

		/* 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)
		@@ -208,6 +212,84 @@ int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
		}
		}

		static int start_endpoints(struct snd_usb_substream *subs)
		{
		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;
		err = snd_usb_endpoint_start(ep);
		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;

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

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

		return 0;
		}

		static void stop_endpoints(struct snd_usb_substream *subs,
		int force, int can_sleep, int wait)
		{
		if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
		snd_usb_endpoint_stop(subs->sync_endpoint,
		force, can_sleep, wait);

		if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
		snd_usb_endpoint_stop(subs->data_endpoint,
		force, can_sleep, wait);
		}

		static int activate_endpoints(struct snd_usb_substream *subs)
		{
		if (subs->sync_endpoint) {
		int ret;

		ret = snd_usb_endpoint_activate(subs->sync_endpoint);
		if (ret < 0)
		return ret;
		}

		return snd_usb_endpoint_activate(subs->data_endpoint);
		}

		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;
		}

		/*
		* find a matching format and set up the interface
		*/
		@@ -219,7 +301,7 @@ static int set_format(struct snd_usb_substream subs, struct audioformat fmt)
		struct usb_interface *iface;
		unsigned int ep, attr;
		int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
		int err;
		int err, implicit_fb = 0;

		iface = usb_ifnum_to_if(dev, fmt->iface);
		if (WARN_ON(!iface))
		@@ -232,40 +314,11 @@ static int set_format(struct snd_usb_substream subs, struct audioformat fmt)
		if (fmt == subs->cur_audiofmt)
		return 0;

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

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

		/* create a data pipe */
		ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
		if (is_playback)
		subs->datapipe = usb_sndisocpipe(dev, ep);
		else
		subs->datapipe = usb_rcvisocpipe(dev, ep);
		subs->datainterval = fmt->datainterval;
		subs->syncpipe = subs->syncinterval = 0;
		subs->maxpacksize = fmt->maxpacksize;
		subs->syncmaxsize = 0;
		subs->fill_max = 0;
		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;

		/* we need a sync pipe in async OUT or adaptive IN mode */
		/* check the number of EP, since some devices have broken
		@@ -273,6 +326,23 @@ static int set_format(struct snd_usb_substream subs, struct audioformat fmt)
		* assume it as adaptive-out or sync-in.
		*/
		attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;

		switch (subs->stream->chip->usb_id) {
		case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
		case USB_ID(0x0763, 0x2081):
		if (is_playback) {
		implicit_fb = 1;
		ep = 0x81;
		iface = usb_ifnum_to_if(dev, 2);

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

		alts = &iface->altsetting[1];
		goto add_sync_ep;
		}
		}

		if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) \|\|
		(!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
		altsd->bNumEndpoints >= 2) {
		@@ -282,7 +352,8 @@ static int set_format(struct snd_usb_substream subs, struct audioformat fmt)
		the audio fields in the endpoint descriptors */
		if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 \|\|
		(get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
		get_endpoint(alts, 1)->bSynchAddress != 0)) {
		get_endpoint(alts, 1)->bSynchAddress != 0 &&
		!implicit_fb)) {
		snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
		dev->devnum, fmt->iface, fmt->altsetting);
		return -EINVAL;
		@@ -290,33 +361,27 @@ static int set_format(struct snd_usb_substream subs, struct audioformat fmt)
		ep = get_endpoint(alts, 1)->bEndpointAddress;
		if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
		(( 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)))) {
		(!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)) \|\|
		( is_playback && !implicit_fb))) {
		snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
		dev->devnum, fmt->iface, fmt->altsetting);
		return -EINVAL;
		}
		ep &= USB_ENDPOINT_NUMBER_MASK;
		if (is_playback)
		subs->syncpipe = usb_rcvisocpipe(dev, ep);
		else
		subs->syncpipe = usb_sndisocpipe(dev, ep);
		if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
		get_endpoint(alts, 1)->bRefresh >= 1 &&
		get_endpoint(alts, 1)->bRefresh <= 9)
		subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
		else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
		subs->syncinterval = 1;
		else if (get_endpoint(alts, 1)->bInterval >= 1 &&
		get_endpoint(alts, 1)->bInterval <= 16)
		subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
		else
		subs->syncinterval = 3;
		subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
		}

		/* always fill max packet size */
		if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
		subs->fill_max = 1;
		implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
		== USB_ENDPOINT_USAGE_IMPLICIT_FB;

		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;
		}

		if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
		return err;
		@@ -390,12 +455,22 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
		if (changed) {
		mutex_lock(&subs->stream->chip->shutdown_mutex);
		/* format changed */
		snd_usb_release_substream_urbs(subs, 0);
		/* influenced: period_bytes, channels, rate, format, */
		ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
		params_rate(hw_params),
		snd_pcm_format_physical_width(params_format(hw_params)) *
		params_channels(hw_params));
		stop_endpoints(subs, 0, 0, 0);
		deactivate_endpoints(subs);

		ret = activate_endpoints(subs);
		if (ret < 0)
		goto unlock;

		ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
		subs->sync_endpoint);
		if (ret < 0)
		goto unlock;

		if (subs->sync_endpoint)
		ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
		hw_params, fmt, NULL);
		unlock:
		mutex_unlock(&subs->stream->chip->shutdown_mutex);
		}

		@@ -415,7 +490,7 @@ static int snd_usb_hw_free(struct snd_pcm_substream *substream)
		subs->cur_rate = 0;
		subs->period_bytes = 0;
		mutex_lock(&subs->stream->chip->shutdown_mutex);
		snd_usb_release_substream_urbs(subs, 0);
		stop_endpoints(subs, 0, 1, 1);
		mutex_unlock(&subs->stream->chip->shutdown_mutex);
		return snd_pcm_lib_free_vmalloc_buffer(substream);
		}
		@@ -435,19 +510,28 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
		return -ENXIO;
		}

		if (snd_BUG_ON(!subs->data_endpoint))
		return -EIO;

		/* some unit conversions in runtime */
		subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
		subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
		subs->data_endpoint->maxframesize =
		bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
		subs->data_endpoint->curframesize =
		bytes_to_frames(runtime, subs->data_endpoint->curpacksize);

		/* reset the pointer */
		subs->hwptr_done = 0;
		subs->transfer_done = 0;
		subs->phase = 0;
		subs->last_delay = 0;
		subs->last_frame_number = 0;
		runtime->delay = 0;

		return snd_usb_substream_prepare(subs, runtime);
		/* 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)
		return start_endpoints(subs);

		return 0;
		}

		static struct snd_pcm_hardware snd_usb_hardware =
		@@ -842,16 +926,171 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)

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

		if (!as->chip->shutdown && subs->interface >= 0) {
		usb_set_interface(subs->dev, subs->interface, 0);
		subs->interface = -1;
		}
		stop_endpoints(subs, 0, 0, 0);
		ret = deactivate_endpoints(subs);
		subs->pcm_substream = NULL;
		snd_usb_autosuspend(subs->stream->chip);
		return 0;

		return ret;
		}

		/* 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;

		stride = runtime->frame_bits >> 3;

		for (i = 0; i < urb->number_of_packets; i++) {
		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
		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) {
		#ifdef CONFIG_SND_DEBUG_VERBOSE
		int oldbytes = bytes;
		#endif
		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;
		}
		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);
		}

		static void prepare_playback_urb(struct snd_usb_substream *subs,
		struct urb *urb)
		{
		struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
		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++) {
		counts = ctx->packet_size[i];
		/* set up descriptor */
		urb->iso_frame_desc[i].offset = frames * stride;
		urb->iso_frame_desc[i].length = counts * stride;
		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 =
		counts * stride;
		subs->transfer_done = 0;
		}
		i++;
		if (i < ctx->packets) {
		/* add a transfer delimiter */
		urb->iso_frame_desc[i].offset =
		frames * stride;
		urb->iso_frame_desc[i].length = 0;
		urb->number_of_packets++;
		}
		break;
		}
		}
		if (period_elapsed &&
		!snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
		break;
		}
		bytes = frames * stride;
		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;
		if (subs->hwptr_done >= runtime->buffer_size * stride)
		subs->hwptr_done -= runtime->buffer_size * stride;
		runtime->delay += frames;
		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;
		int stride = runtime->frame_bits >> 3;
		int processed = urb->transfer_buffer_length / stride;

		spin_lock_irqsave(&subs->lock, flags);
		if (processed > runtime->delay)
		runtime->delay = 0;
		else
		runtime->delay -= processed;
		spin_unlock_irqrestore(&subs->lock, flags);
		}

		static int snd_usb_playback_open(struct snd_pcm_substream *substream)
		@@ -874,6 +1113,56 @@ static int snd_usb_capture_close(struct snd_pcm_substream *substream)
		return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
		}

		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;
		return 0;
		case SNDRV_PCM_TRIGGER_STOP:
		stop_endpoints(subs, 0, 0, 0);
		return 0;
		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->prepare_data_urb = NULL;
		subs->data_endpoint->retire_data_urb = NULL;
		return 0;
		}

		return -EINVAL;
		}

		int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd)
		{
		int err;
		struct snd_usb_substream *subs = substream->runtime->private_data;

		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
		err = start_endpoints(subs);
		if (err < 0)
		return err;

		subs->data_endpoint->retire_data_urb = retire_capture_urb;
		return 0;
		case SNDRV_PCM_TRIGGER_STOP:
		stop_endpoints(subs, 0, 0, 0);
		return 0;
		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->retire_data_urb = NULL;
		return 0;
		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->retire_data_urb = retire_capture_urb;
		return 0;
		}

		return -EINVAL;
		}

		static struct snd_pcm_ops snd_usb_playback_ops = {
		.open = snd_usb_playback_open,
		.close = snd_usb_playback_close,