pcm.c 40.4 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/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 & (1uLL << 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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	struct usb_interface_descriptor *altsd = get_iface_desc(alts);

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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 (altsd->bInterfaceProtocol) {
	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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/*
 * 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;
	unsigned int ep, attr;
	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
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	int err, implicit_fb = 0;
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	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;

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	/* 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;
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		/*
		 * "Playback Design" products need a 50ms delay after setting the
		 * USB interface.
		 */
		if (le16_to_cpu(dev->descriptor.idVendor) == 0x23ba)
			mdelay(50);
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	}

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	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;
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	/* 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;
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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) ||
	     (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
	    altsd->bNumEndpoints >= 2) {
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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 */
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		if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
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		    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
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		     get_endpoint(alts, 1)->bSynchAddress != 0 &&
		     !implicit_fb)) {
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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);
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			return -EINVAL;
		}
		ep = get_endpoint(alts, 1)->bEndpointAddress;
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		if (!implicit_fb &&
		    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)) ||
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		     (!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);
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			return -EINVAL;
		}
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		implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
				== USB_ENDPOINT_USAGE_IMPLICIT_FB;

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

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

	subs->cur_audiofmt = fmt;

	snd_usb_set_format_quirk(subs, fmt);

#if 0
	printk(KERN_DEBUG
	       "setting done: format = %d, rate = %d..%d, channels = %d\n",
	       fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
	printk(KERN_DEBUG
	       "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
	       subs->datapipe, subs->syncpipe);
#endif

	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;
	}

	if (!(fp->formats & (1ULL << pcm_format))) {
		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);

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	/* 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;
}

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/*
 * configure endpoint params
 *
 * called  during initial setup and upon resume
 */
static int configure_endpoint(struct snd_usb_substream *subs)
{
	int ret;

	/* format changed */
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	stop_endpoints(subs, true);
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	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)
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		return ret;
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	if (subs->sync_endpoint)
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		ret = configure_sync_endpoint(subs);

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	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;
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	int ret;
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	ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
					       params_buffer_bytes(hw_params));
	if (ret < 0)
		return ret;

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	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",
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			   subs->pcm_format, subs->cur_rate, subs->channels);
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		return -EINVAL;
	}

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	down_read(&subs->stream->chip->shutdown_rwsem);
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	if (subs->stream->chip->shutdown)
		ret = -ENODEV;
	else
		ret = set_format(subs, fmt);
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	up_read(&subs->stream->chip->shutdown_rwsem);
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	if (ret < 0)
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		return ret;

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	subs->interface = fmt->iface;
	subs->altset_idx = fmt->altset_idx;
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	subs->need_setup_ep = true;
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	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;
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	down_read(&subs->stream->chip->shutdown_rwsem);
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	if (!subs->stream->chip->shutdown) {
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		stop_endpoints(subs, true);
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		deactivate_endpoints(subs);
	}
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	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;
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	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;
	}

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	down_read(&subs->stream->chip->shutdown_rwsem);
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	if (subs->stream->chip->shutdown) {
		ret = -ENODEV;
		goto unlock;
	}
	if (snd_BUG_ON(!subs->data_endpoint)) {
		ret = -EIO;
		goto unlock;
	}
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	snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
	snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);

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	ret = set_format(subs, subs->cur_audiofmt);
	if (ret < 0)
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		goto unlock;
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	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)
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		goto unlock;
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	if (subs->need_setup_ep) {
		ret = configure_endpoint(subs);
		if (ret < 0)
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			goto unlock;
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		subs->need_setup_ep = false;
	}
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	/* some unit conversions in runtime */
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	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;
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	subs->last_delay = 0;
	subs->last_frame_number = 0;
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	runtime->delay = 0;

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	/* 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)
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		ret = start_endpoints(subs, true);
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	up_read(&subs->stream->chip->shutdown_rwsem);
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	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);
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	struct snd_mask check_fmts;
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	unsigned int ptime;

	/* check the format */
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	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 */
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	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;
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	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;
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	list_for_each_entry(fp, &subs->fmt_list, list) {
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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;
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	struct audioformat *fp;
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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;
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	list_for_each_entry(fp, &subs->fmt_list, list) {
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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;
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	struct audioformat *fp;
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	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;
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	list_for_each_entry(fp, &subs->fmt_list, list) {
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		if (!hw_check_valid_format(subs, params, fp))
			continue;
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		fbits |= fp->formats;
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	}

	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) {
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		hwc_debug("  --> get empty\n");
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		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;
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	int *rate_list;
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	int count = 0, needs_knot = 0;
	int err;

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

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	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;
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