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ALSA: usb-audio: Don't require hw_params in endpoint.

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Change the interface to configure an endpoint so that it doesn't require
a hw_params struct.  This will allow it to be called from prepare
instead of hw_params, configuring it after system resume.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Dylan Reid 2012-09-18 09:49:47 -07:00 committed by Takashi Iwai
parent 715a170563
commit 35ec7aa298
3 changed files with 35 additions and 17 deletions
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31
sound/usb/endpoint.c
View file

@ -567,20 +567,19 @@ static void release_urbs(struct snd_usb_endpoint *ep, int force)
* configure a data endpoint
*/
static int data_ep_set_params(struct snd_usb_endpoint *ep,
struct snd_pcm_hw_params *hw_params,
snd_pcm_format_t pcm_format,
unsigned int channels,
unsigned int period_bytes,
struct audioformat *fmt,
struct snd_usb_endpoint *sync_ep)
{
unsigned int maxsize, i, urb_packs, total_packs, packs_per_ms;
int period_bytes = params_period_bytes(hw_params);
int format = params_format(hw_params);
int is_playback = usb_pipeout(ep->pipe);
int frame_bits = snd_pcm_format_physical_width(params_format(hw_params)) *
params_channels(hw_params);
int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
ep->datainterval = fmt->datainterval;
ep->stride = frame_bits >> 3;
ep->silence_value = format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;
ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;
/* calculate max. frequency */
if (ep->maxpacksize) {
@ -693,7 +692,6 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
* configure a sync endpoint
*/
static int sync_ep_set_params(struct snd_usb_endpoint *ep,
struct snd_pcm_hw_params *hw_params,
struct audioformat *fmt)
{
int i;
@ -736,7 +734,10 @@ static int sync_ep_set_params(struct snd_usb_endpoint *ep,
* snd_usb_endpoint_set_params: configure an snd_usb_endpoint
*
* @ep: the snd_usb_endpoint to configure
* @hw_params: the hardware parameters
* @pcm_format: the audio fomat.
* @channels: the number of audio channels.
* @period_bytes: the number of bytes in one alsa period.
* @rate: the frame rate.
* @fmt: the USB audio format information
* @sync_ep: the sync endpoint to use, if any
*
@ -745,7 +746,10 @@ static int sync_ep_set_params(struct snd_usb_endpoint *ep,
* An endpoint that is already running can not be reconfigured.
*/
int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
struct snd_pcm_hw_params *hw_params,
snd_pcm_format_t pcm_format,
unsigned int channels,
unsigned int period_bytes,
unsigned int rate,
struct audioformat *fmt,
struct snd_usb_endpoint *sync_ep)
{
@ -765,9 +769,9 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX);
if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL)
ep->freqn = get_usb_full_speed_rate(params_rate(hw_params));
ep->freqn = get_usb_full_speed_rate(rate);
else
ep->freqn = get_usb_high_speed_rate(params_rate(hw_params));
ep->freqn = get_usb_high_speed_rate(rate);
/* calculate the frequency in 16.16 format */
ep->freqm = ep->freqn;
@ -777,10 +781,11 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
switch (ep->type) {
case SND_USB_ENDPOINT_TYPE_DATA:
err = data_ep_set_params(ep, hw_params, fmt, sync_ep);
err = data_ep_set_params(ep, pcm_format, channels,
period_bytes, fmt, sync_ep);
break;
case SND_USB_ENDPOINT_TYPE_SYNC:
err = sync_ep_set_params(ep, hw_params, fmt);
err = sync_ep_set_params(ep, fmt);
break;
default:
err = -EINVAL;

5
sound/usb/endpoint.h
View file

@ -9,7 +9,10 @@ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
int ep_num, int direction, int type);
int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
struct snd_pcm_hw_params *hw_params,
snd_pcm_format_t pcm_format,
unsigned int channels,
unsigned int period_bytes,
unsigned int rate,
struct audioformat *fmt,
struct snd_usb_endpoint *sync_ep);

16
sound/usb/pcm.c
View file

@ -491,14 +491,24 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
mutex_lock(&subs->stream->chip->shutdown_mutex);
/* format changed */
stop_endpoints(subs, 0, 0, 0);
ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
ret = snd_usb_endpoint_set_params(subs->data_endpoint,
format,
channels,
subs->period_bytes,
rate,
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);
ret = snd_usb_endpoint_set_params(subs->data_endpoint,
format,
channels,
subs->period_bytes,
rate,
fmt,
NULL);
unlock:
mutex_unlock(&subs->stream->chip->shutdown_mutex);
}