/**
* Set default hardware params
*/
static int playback_default_hw_params(struct gaudio_snd_dev *snd)
{
struct snd_pcm_substream *substream = snd->substream;
struct snd_pcm_hw_params *params;
snd_pcm_sframes_t result;
/*
* SNDRV_PCM_ACCESS_RW_INTERLEAVED,
* SNDRV_PCM_FORMAT_S16_LE
* CHANNELS: 2
* RATE: 48000
*/
snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
snd->format = SNDRV_PCM_FORMAT_S16_LE;
snd->channels = 2;
snd->rate = 48000;
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
_snd_pcm_hw_params_any(params);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
snd->access, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
snd->format, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
snd->channels, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
snd->rate, 0);
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);
result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
if (result < 0) {
ERROR(snd->card,
"Preparing sound card failed: %d\n", (int)result);
kfree(params);
return result;
}
/* Store the hardware parameters */
snd->access = params_access(params);
snd->format = params_format(params);
snd->channels = params_channels(params);
snd->rate = params_rate(params);
kfree(params);
INFO(snd->card,
"Hardware params: access %x, format %x, channels %d, rate %d\n",
snd->access, snd->format, snd->channels, snd->rate);
return 0;
}
static int playback_prepare_params(struct gaudio_snd_dev *snd)
{
struct snd_pcm_substream *substream = snd->substream;
struct snd_pcm_hw_params *params;
snd_pcm_sframes_t result;
snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
snd->format = SNDRV_PCM_FORMAT_S16_LE;
snd->channels = 2;
snd->rate = 8000;
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
_snd_pcm_hw_params_any(params);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
snd->access, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
snd->format, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
snd->channels, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
snd->rate, 0);
result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
if (result < 0)
pr_err("SNDRV_PCM_IOCTL_DROP failed: %d\n", (int)result);
result = snd_pcm_kernel_ioctl(substream,
SNDRV_PCM_IOCTL_HW_PARAMS, params);
if (result < 0) {
pr_err("SNDRV_PCM_IOCTL_HW_PARAMS failed: %d\n", (int)result);
kfree(params);
return result;
}
result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
if (result < 0)
pr_err("Preparing playback failed: %d\n", (int)result);
snd->access = params_access(params);
snd->format = params_format(params);
snd->channels = params_channels(params);
snd->rate = params_rate(params);
kfree(params);
pr_debug("playback params: access %x, format %x, channels %d, rate %d\n",
snd->access, snd->format, snd->channels, snd->rate);
return 0;
}
static int capture_default_hw_params(struct gaudio_snd_dev *snd)
{
struct snd_pcm_hw_params *params;
/*
* SNDRV_PCM_ACCESS_RW_INTERLEAVED,
* SNDRV_PCM_FORMAT_S16_LE
* CHANNELS: 1
* RATE: 8000
*/
snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
snd->format = SNDRV_PCM_FORMAT_S16_LE;
snd->channels = 1;
snd->rate = 8000;
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
_snd_pcm_hw_params_any(params);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
snd->access, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
snd->format, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
snd->channels, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
snd->rate, 0);
/* Store the hardware parameters */
snd->access = params_access(params);
snd->format = params_format(params);
snd->channels = params_channels(params);
snd->rate = params_rate(params);
kfree(params);
pr_debug("capture params: access %x, format %x, channels %d, rate %d\n",
snd->access, snd->format, snd->channels, snd->rate);
return 0;
}
/**
* snd_pcm_hw_param_set
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @val: value to set
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS remove from PAR all
* values != VAL. Reduce configuration space accordingly.
* Return VAL or -EINVAL if the configuration space is empty
*/
static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed = _snd_pcm_hw_param_set(params, var, val, dir);
if (changed < 0)
return changed;
if (params->rmask)
{
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return snd_pcm_hw_param_value(params, var, NULL);
}
static int capture_prepare_params(struct gaudio_snd_dev *snd)
{
struct snd_pcm_substream *substream = snd->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hw_params *params;
struct snd_pcm_sw_params *swparams;
unsigned long period_size;
unsigned long buffer_size;
snd_pcm_sframes_t result = 0;
snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
snd->format = SNDRV_PCM_FORMAT_S16_LE;
snd->channels = 1;
snd->rate = 8000;
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (!params) {
pr_err("Failed to allocate hw params");
return -ENOMEM;
}
_snd_pcm_hw_params_any(params);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
snd->access, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
snd->format, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
snd->channels, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
snd->rate, 0);
result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
if (result < 0)
pr_err("SNDRV_PCM_IOCTL_DROP failed: %d\n", (int)result);
result = snd_pcm_kernel_ioctl(substream,
SNDRV_PCM_IOCTL_HW_PARAMS, params);
if (result < 0) {
pr_err("SNDRV_PCM_IOCTL_HW_PARAMS failed: %d\n", (int)result);
kfree(params);
return result;
}
result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE,
NULL);
if (result < 0)
pr_err("Preparing capture failed: %d\n", (int)result);
snd->access = params_access(params);
snd->format = params_format(params);
snd->channels = params_channels(params);
snd->rate = params_rate(params);
runtime->frame_bits = snd_pcm_format_physical_width(runtime->format);
swparams = kzalloc(sizeof(*swparams), GFP_KERNEL);
if (!swparams) {
pr_err("Failed to allocate sw params");
kfree(params);
return -ENOMEM;
}
buffer_size = pcm_buffer_size(params);
period_size = pcm_period_size(params);
swparams->avail_min = period_size/2;
swparams->xfer_align = period_size/2;
kfree(params);
swparams->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
swparams->period_step = 1;
swparams->start_threshold = 1;
swparams->stop_threshold = INT_MAX;
swparams->silence_size = 0;
swparams->silence_threshold = 0;
result = snd_pcm_kernel_ioctl(substream,
SNDRV_PCM_IOCTL_SW_PARAMS, swparams);
if (result < 0)
pr_err("SNDRV_PCM_IOCTL_SW_PARAMS failed: %d\n", (int)result);
kfree(swparams);
pr_debug("capture params: access %x, format %x, channels %d, rate %d\n",
snd->access, snd->format, snd->channels, snd->rate);
return result;
}
