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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/audio-v2.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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/* return the estimated delay based on USB frame counters */
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snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
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int current_frame_number;
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current_frame_number = usb_get_current_frame_number(subs->dev);
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* HCD implementations use different widths, use lower 8 bits.
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* The delay will be managed up to 256ms, which is more than
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frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
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/* Approximation based on number of samples per USB frame (ms),
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some truncation for 44.1 but the estimate is good enough */
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est_delay = subs->last_delay - (frame_diff * rate / 1000);
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* return the current pcm pointer. just based on the hwptr_done value.
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static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
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struct snd_usb_substream *subs;
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unsigned int hwptr_done;
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subs = (struct snd_usb_substream *)substream->runtime->private_data;
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spin_lock(&subs->lock);
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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);
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return hwptr_done / (substream->runtime->frame_bits >> 3);
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* find a matching audio format
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static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
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unsigned int rate, unsigned int channels)
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struct audioformat *found = NULL;
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int cur_attr = 0, attr;
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list_for_each(p, &subs->fmt_list) {
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struct audioformat *fp;
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fp = list_entry(p, struct audioformat, list);
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if (!(fp->formats & (1uLL << format)))
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if (fp->channels != channels)
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if (rate < fp->rate_min || rate > fp->rate_max)
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if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
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for (i = 0; i < fp->nr_rates; i++)
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if (fp->rate_table[i] == rate)
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if (i >= fp->nr_rates)
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attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
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/* avoid async out and adaptive in if the other method
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* supports the same format.
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* this is a workaround for the case like
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* M-audio audiophile USB.
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if (attr != cur_attr) {
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if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
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subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
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(attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
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subs->direction == SNDRV_PCM_STREAM_CAPTURE))
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if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
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subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
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(cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
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subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
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/* find the format with the largest max. packet size */
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if (fp->maxpacksize > found->maxpacksize) {
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static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt)
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struct usb_device *dev = chip->dev;
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unsigned char data[1];
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ep = get_endpoint(alts, 0)->bEndpointAddress;
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if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
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USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
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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",
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dev->devnum, iface, ep);
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static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt)
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struct usb_device *dev = chip->dev;
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unsigned char data[1];
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ep = get_endpoint(alts, 0)->bEndpointAddress;
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if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
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USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
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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",
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dev->devnum, iface, fmt->altsetting);
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* initialize the pitch control and sample rate
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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,
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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 */
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if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
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switch (altsd->bInterfaceProtocol) {
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return init_pitch_v1(chip, iface, alts, fmt);
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return init_pitch_v2(chip, iface, alts, fmt);
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* find a matching format and set up the interface
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static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
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struct usb_device *dev = subs->dev;
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struct usb_host_interface *alts;
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struct usb_interface_descriptor *altsd;
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struct usb_interface *iface;
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unsigned int ep, attr;
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int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
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iface = usb_ifnum_to_if(dev, fmt->iface);
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alts = &iface->altsetting[fmt->altset_idx];
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altsd = get_iface_desc(alts);
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if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
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if (fmt == subs->cur_audiofmt)
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/* close the old interface */
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if (subs->interface >= 0 && subs->interface != fmt->iface) {
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if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
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snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
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dev->devnum, fmt->iface, fmt->altsetting);
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subs->interface = -1;
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subs->altset_idx = 0;
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if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
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if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
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snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
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dev->devnum, fmt->iface, fmt->altsetting);
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snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
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subs->interface = fmt->iface;
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subs->altset_idx = fmt->altset_idx;
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/* create a data pipe */
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ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
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subs->datapipe = usb_sndisocpipe(dev, ep);
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subs->datapipe = usb_rcvisocpipe(dev, ep);
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subs->datainterval = fmt->datainterval;
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subs->syncpipe = subs->syncinterval = 0;
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subs->maxpacksize = fmt->maxpacksize;
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subs->syncmaxsize = 0;
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/* we need a sync pipe in async OUT or adaptive IN mode */
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/* check the number of EP, since some devices have broken
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* descriptors which fool us. if it has only one EP,
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* assume it as adaptive-out or sync-in.
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attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
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if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
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(! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
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altsd->bNumEndpoints >= 2) {
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/* check sync-pipe endpoint */
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/* ... and check descriptor size before accessing bSynchAddress
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because there is a version of the SB Audigy 2 NX firmware lacking
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the audio fields in the endpoint descriptors */
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if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
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(get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
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get_endpoint(alts, 1)->bSynchAddress != 0)) {
286
snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
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dev->devnum, fmt->iface, fmt->altsetting);
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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)) ||
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(!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
294
snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
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dev->devnum, fmt->iface, fmt->altsetting);
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ep &= USB_ENDPOINT_NUMBER_MASK;
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subs->syncpipe = usb_rcvisocpipe(dev, ep);
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subs->syncpipe = usb_sndisocpipe(dev, ep);
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if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
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get_endpoint(alts, 1)->bRefresh >= 1 &&
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get_endpoint(alts, 1)->bRefresh <= 9)
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subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
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else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
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subs->syncinterval = 1;
309
else if (get_endpoint(alts, 1)->bInterval >= 1 &&
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get_endpoint(alts, 1)->bInterval <= 16)
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subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
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subs->syncinterval = 3;
314
subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
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/* always fill max packet size */
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if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
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if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
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subs->cur_audiofmt = fmt;
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snd_usb_set_format_quirk(subs, fmt);
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"setting done: format = %d, rate = %d..%d, channels = %d\n",
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fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
333
" datapipe = 0x%0x, syncpipe = 0x%0x\n",
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subs->datapipe, subs->syncpipe);
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* allocate a buffer and set the given audio format.
345
* so far we use a physically linear buffer although packetize transfer
346
* doesn't need a continuous area.
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* if sg buffer is supported on the later version of alsa, we'll follow
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static int snd_usb_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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struct snd_usb_substream *subs = substream->runtime->private_data;
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struct audioformat *fmt;
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unsigned int channels, rate, format;
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ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
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params_buffer_bytes(hw_params));
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format = params_format(hw_params);
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rate = params_rate(hw_params);
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channels = params_channels(hw_params);
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fmt = find_format(subs, format, rate, channels);
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snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
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format, rate, channels);
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changed = subs->cur_audiofmt != fmt ||
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subs->period_bytes != params_period_bytes(hw_params) ||
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subs->cur_rate != rate;
376
if ((ret = set_format(subs, fmt)) < 0)
379
if (subs->cur_rate != rate) {
380
struct usb_host_interface *alts;
381
struct usb_interface *iface;
382
iface = usb_ifnum_to_if(subs->dev, fmt->iface);
383
alts = &iface->altsetting[fmt->altset_idx];
384
ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
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subs->cur_rate = rate;
391
mutex_lock(&subs->stream->chip->shutdown_mutex);
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snd_usb_release_substream_urbs(subs, 0);
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/* influenced: period_bytes, channels, rate, format, */
395
ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
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params_rate(hw_params),
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snd_pcm_format_physical_width(params_format(hw_params)) *
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params_channels(hw_params));
399
mutex_unlock(&subs->stream->chip->shutdown_mutex);
408
* reset the audio format and release the buffer
410
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
412
struct snd_usb_substream *subs = substream->runtime->private_data;
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subs->cur_audiofmt = NULL;
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subs->period_bytes = 0;
417
mutex_lock(&subs->stream->chip->shutdown_mutex);
418
snd_usb_release_substream_urbs(subs, 0);
419
mutex_unlock(&subs->stream->chip->shutdown_mutex);
420
return snd_pcm_lib_free_vmalloc_buffer(substream);
426
* only a few subtle things...
428
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
430
struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_usb_substream *subs = runtime->private_data;
433
if (! subs->cur_audiofmt) {
434
snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
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/* some unit conversions in runtime */
439
subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
440
subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
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/* reset the pointer */
443
subs->hwptr_done = 0;
444
subs->transfer_done = 0;
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subs->last_delay = 0;
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subs->last_frame_number = 0;
450
return snd_usb_substream_prepare(subs, runtime);
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static struct snd_pcm_hardware snd_usb_hardware =
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_PAUSE,
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.buffer_bytes_max = 1024 * 1024,
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.period_bytes_min = 64,
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.period_bytes_max = 512 * 1024,
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static int hw_check_valid_format(struct snd_usb_substream *subs,
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struct snd_pcm_hw_params *params,
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struct audioformat *fp)
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struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
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struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
474
struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
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struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
476
struct snd_mask check_fmts;
479
/* check the format */
480
snd_mask_none(&check_fmts);
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check_fmts.bits[0] = (u32)fp->formats;
482
check_fmts.bits[1] = (u32)(fp->formats >> 32);
483
snd_mask_intersect(&check_fmts, fmts);
484
if (snd_mask_empty(&check_fmts)) {
485
hwc_debug(" > check: no supported format %d\n", fp->format);
488
/* check the channels */
489
if (fp->channels < ct->min || fp->channels > ct->max) {
490
hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
493
/* check the rate is within the range */
494
if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
495
hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
498
if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
499
hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
502
/* check whether the period time is >= the data packet interval */
503
if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
504
ptime = 125 * (1 << fp->datainterval);
505
if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
506
hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
513
static int hw_rule_rate(struct snd_pcm_hw_params *params,
514
struct snd_pcm_hw_rule *rule)
516
struct snd_usb_substream *subs = rule->private;
518
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
519
unsigned int rmin, rmax;
522
hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
525
list_for_each(p, &subs->fmt_list) {
526
struct audioformat *fp;
527
fp = list_entry(p, struct audioformat, list);
528
if (!hw_check_valid_format(subs, params, fp))
531
if (rmin > fp->rate_min)
533
if (rmax < fp->rate_max)
542
hwc_debug(" --> get empty\n");
548
if (it->min < rmin) {
553
if (it->max > rmax) {
558
if (snd_interval_checkempty(it)) {
562
hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
567
static int hw_rule_channels(struct snd_pcm_hw_params *params,
568
struct snd_pcm_hw_rule *rule)
570
struct snd_usb_substream *subs = rule->private;
572
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
573
unsigned int rmin, rmax;
576
hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
579
list_for_each(p, &subs->fmt_list) {
580
struct audioformat *fp;
581
fp = list_entry(p, struct audioformat, list);
582
if (!hw_check_valid_format(subs, params, fp))
585
if (rmin > fp->channels)
587
if (rmax < fp->channels)
596
hwc_debug(" --> get empty\n");
602
if (it->min < rmin) {
607
if (it->max > rmax) {
612
if (snd_interval_checkempty(it)) {
616
hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
620
static int hw_rule_format(struct snd_pcm_hw_params *params,
621
struct snd_pcm_hw_rule *rule)
623
struct snd_usb_substream *subs = rule->private;
625
struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
630
hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
632
list_for_each(p, &subs->fmt_list) {
633
struct audioformat *fp;
634
fp = list_entry(p, struct audioformat, list);
635
if (!hw_check_valid_format(subs, params, fp))
637
fbits |= fp->formats;
640
oldbits[0] = fmt->bits[0];
641
oldbits[1] = fmt->bits[1];
642
fmt->bits[0] &= (u32)fbits;
643
fmt->bits[1] &= (u32)(fbits >> 32);
644
if (!fmt->bits[0] && !fmt->bits[1]) {
645
hwc_debug(" --> get empty\n");
648
changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
649
hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
653
static int hw_rule_period_time(struct snd_pcm_hw_params *params,
654
struct snd_pcm_hw_rule *rule)
656
struct snd_usb_substream *subs = rule->private;
657
struct audioformat *fp;
658
struct snd_interval *it;
659
unsigned char min_datainterval;
663
it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
664
hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
665
min_datainterval = 0xff;
666
list_for_each_entry(fp, &subs->fmt_list, list) {
667
if (!hw_check_valid_format(subs, params, fp))
669
min_datainterval = min(min_datainterval, fp->datainterval);
671
if (min_datainterval == 0xff) {
672
hwc_debug(" --> get empty\n");
676
pmin = 125 * (1 << min_datainterval);
678
if (it->min < pmin) {
683
if (snd_interval_checkempty(it)) {
687
hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
692
* If the device supports unusual bit rates, does the request meet these?
694
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
695
struct snd_usb_substream *subs)
697
struct audioformat *fp;
698
int count = 0, needs_knot = 0;
701
list_for_each_entry(fp, &subs->fmt_list, list) {
702
if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
704
count += fp->nr_rates;
705
if (fp->rates & SNDRV_PCM_RATE_KNOT)
711
subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
712
if (!subs->rate_list.list)
714
subs->rate_list.count = count;
715
subs->rate_list.mask = 0;
717
list_for_each_entry(fp, &subs->fmt_list, list) {
719
for (i = 0; i < fp->nr_rates; i++)
720
subs->rate_list.list[count++] = fp->rate_table[i];
722
err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
732
* set up the runtime hardware information.
735
static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
738
unsigned int pt, ptmin;
739
int param_period_time_if_needed;
742
runtime->hw.formats = subs->formats;
744
runtime->hw.rate_min = 0x7fffffff;
745
runtime->hw.rate_max = 0;
746
runtime->hw.channels_min = 256;
747
runtime->hw.channels_max = 0;
748
runtime->hw.rates = 0;
750
/* check min/max rates and channels */
751
list_for_each(p, &subs->fmt_list) {
752
struct audioformat *fp;
753
fp = list_entry(p, struct audioformat, list);
754
runtime->hw.rates |= fp->rates;
755
if (runtime->hw.rate_min > fp->rate_min)
756
runtime->hw.rate_min = fp->rate_min;
757
if (runtime->hw.rate_max < fp->rate_max)
758
runtime->hw.rate_max = fp->rate_max;
759
if (runtime->hw.channels_min > fp->channels)
760
runtime->hw.channels_min = fp->channels;
761
if (runtime->hw.channels_max < fp->channels)
762
runtime->hw.channels_max = fp->channels;
763
if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
764
/* FIXME: there might be more than one audio formats... */
765
runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
768
pt = 125 * (1 << fp->datainterval);
769
ptmin = min(ptmin, pt);
771
err = snd_usb_autoresume(subs->stream->chip);
775
param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
776
if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
777
/* full speed devices have fixed data packet interval */
780
/* if period time doesn't go below 1 ms, no rules needed */
781
param_period_time_if_needed = -1;
782
snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
785
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
787
SNDRV_PCM_HW_PARAM_FORMAT,
788
SNDRV_PCM_HW_PARAM_CHANNELS,
789
param_period_time_if_needed,
792
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
793
hw_rule_channels, subs,
794
SNDRV_PCM_HW_PARAM_FORMAT,
795
SNDRV_PCM_HW_PARAM_RATE,
796
param_period_time_if_needed,
799
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
800
hw_rule_format, subs,
801
SNDRV_PCM_HW_PARAM_RATE,
802
SNDRV_PCM_HW_PARAM_CHANNELS,
803
param_period_time_if_needed,
806
if (param_period_time_if_needed >= 0) {
807
err = snd_pcm_hw_rule_add(runtime, 0,
808
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
809
hw_rule_period_time, subs,
810
SNDRV_PCM_HW_PARAM_FORMAT,
811
SNDRV_PCM_HW_PARAM_CHANNELS,
812
SNDRV_PCM_HW_PARAM_RATE,
817
if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
822
snd_usb_autosuspend(subs->stream->chip);
826
static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
828
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
829
struct snd_pcm_runtime *runtime = substream->runtime;
830
struct snd_usb_substream *subs = &as->substream[direction];
832
subs->interface = -1;
833
subs->altset_idx = 0;
834
runtime->hw = snd_usb_hardware;
835
runtime->private_data = subs;
836
subs->pcm_substream = substream;
837
/* runtime PM is also done there */
838
return setup_hw_info(runtime, subs);
841
static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
843
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
844
struct snd_usb_substream *subs = &as->substream[direction];
846
if (!as->chip->shutdown && subs->interface >= 0) {
847
usb_set_interface(subs->dev, subs->interface, 0);
848
subs->interface = -1;
850
subs->pcm_substream = NULL;
851
snd_usb_autosuspend(subs->stream->chip);
855
static int snd_usb_playback_open(struct snd_pcm_substream *substream)
857
return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
860
static int snd_usb_playback_close(struct snd_pcm_substream *substream)
862
return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
865
static int snd_usb_capture_open(struct snd_pcm_substream *substream)
867
return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
870
static int snd_usb_capture_close(struct snd_pcm_substream *substream)
872
return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
875
static struct snd_pcm_ops snd_usb_playback_ops = {
876
.open = snd_usb_playback_open,
877
.close = snd_usb_playback_close,
878
.ioctl = snd_pcm_lib_ioctl,
879
.hw_params = snd_usb_hw_params,
880
.hw_free = snd_usb_hw_free,
881
.prepare = snd_usb_pcm_prepare,
882
.trigger = snd_usb_substream_playback_trigger,
883
.pointer = snd_usb_pcm_pointer,
884
.page = snd_pcm_lib_get_vmalloc_page,
885
.mmap = snd_pcm_lib_mmap_vmalloc,
888
static struct snd_pcm_ops snd_usb_capture_ops = {
889
.open = snd_usb_capture_open,
890
.close = snd_usb_capture_close,
891
.ioctl = snd_pcm_lib_ioctl,
892
.hw_params = snd_usb_hw_params,
893
.hw_free = snd_usb_hw_free,
894
.prepare = snd_usb_pcm_prepare,
895
.trigger = snd_usb_substream_capture_trigger,
896
.pointer = snd_usb_pcm_pointer,
897
.page = snd_pcm_lib_get_vmalloc_page,
898
.mmap = snd_pcm_lib_mmap_vmalloc,
901
void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
903
snd_pcm_set_ops(pcm, stream,
904
stream == SNDRV_PCM_STREAM_PLAYBACK ?
905
&snd_usb_playback_ops : &snd_usb_capture_ops);