/**
* 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 size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
{
struct gaudio_snd_dev *snd = &card->playback;
struct snd_pcm_substream *substream = snd->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
mm_segment_t old_fs;
ssize_t result;
snd_pcm_sframes_t frames;
int err = 0;
if (!count) {
pr_err("Buffer is empty, no data to play");
return 0;
}
if (!audio_reinit) {
err = gaudio_open_streams();
if (err) {
pr_err("Failed to init audio streams");
return 0;
}
audio_reinit = 1;
}
try_again:
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ||
runtime->status->state == SNDRV_PCM_STATE_SETUP) {
result = snd_pcm_kernel_ioctl(substream,
SNDRV_PCM_IOCTL_PREPARE, NULL);
if (result < 0) {
pr_err("Preparing playback failed: %d\n",
(int)result);
return result;
}
}
if (!runtime->frame_bits) {
pr_err("SND failure - runtime->frame_bits == 0");
return 0;
}
frames = bytes_to_frames(runtime, count);
pr_debug("runtime->frame_bits = %d, count = %d, frames = %d",
runtime->frame_bits, (int)count, (int)frames);
old_fs = get_fs();
set_fs(KERNEL_DS);
result = snd_pcm_lib_write(snd->substream, buf, frames);
if (result != frames) {
pr_err("snd_pcm_lib_write failed with err %d\n", (int)result);
set_fs(old_fs);
goto try_again;
}
set_fs(old_fs);
pr_debug("Done. Sent %d frames", (int)frames);
return 0;
}
int ksnd_pcm_start(ksnd_pcm_t *kpcm)
{
snd_pcm_substream_t *substream = kpcm->substream;
if (substream != NULL)
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
return 0;
}
/**
* Playback audio buffer data by ALSA PCM device
*/
static size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
{
struct gaudio_snd_dev *snd = &card->playback;
struct snd_pcm_substream *substream = snd->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
mm_segment_t old_fs;
ssize_t result;
snd_pcm_sframes_t frames;
try_again:
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
result = snd_pcm_kernel_ioctl(substream,
SNDRV_PCM_IOCTL_PREPARE, NULL);
if (result < 0) {
ERROR(card, "Preparing sound card failed: %d\n",
(int)result);
return result;
}
}
frames = bytes_to_frames(runtime, count);
old_fs = get_fs();
set_fs(KERNEL_DS);
result = snd_pcm_lib_write(snd->substream, buf, frames);
if (result != frames) {
ERROR(card, "Playback error: %d\n", (int)result);
set_fs(old_fs);
goto try_again;
}
set_fs(old_fs);
return 0;
}
int ksnd_pcm_prepare(ksnd_pcm_t *kpcm)
{
int err;
snd_pcm_substream_t *substream = kpcm->substream;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
if (err < 0)
{
snd_printd("alsa_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
return err;
}
return 0;
}
int ksnd_pcm_hw_params(ksnd_pcm_t *kpcm, ksnd_pcm_hw_params_t *params)
{
snd_pcm_substream_t *substream = kpcm->substream;
int err;
if (substream == NULL)
return -EFAULT;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS,
params);
if (0 != err)
return err;
kpcm->actual_hwparams = *params;
return 0;
}
int ksnd_pcm_delay(ksnd_pcm_t *pcm, snd_pcm_sframes_t *delay)
{
snd_pcm_substream_t *substream = pcm->substream;
snd_pcm_sframes_t frames;
int err;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &frames);
if (err < 0)
{
return err;
}
*delay = frames;
return 0;
}
static size_t u_audio_capture(struct gaudio *card, void *buf, size_t count)
{
ssize_t result;
mm_segment_t old_fs;
snd_pcm_sframes_t frames;
int err = 0;
struct gaudio_snd_dev *snd = &card->capture;
struct snd_pcm_substream *substream = snd->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
if (!audio_reinit) {
err = gaudio_open_streams();
if (err) {
pr_err("Failed to init audio streams: err %d", err);
return 0;
}
audio_reinit = 1;
}
try_again:
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ||
runtime->status->state == SNDRV_PCM_STATE_SETUP) {
result = snd_pcm_kernel_ioctl(substream,
SNDRV_PCM_IOCTL_PREPARE, NULL);
if (result < 0) {
pr_err("Preparing capture failed: %d\n",
(int)result);
return result;
}
}
frames = bytes_to_frames(runtime, count);
old_fs = get_fs();
set_fs(KERNEL_DS);
pr_debug("frames = %d, count = %d", (int)frames, count);
result = snd_pcm_lib_read(substream, buf, frames);
if (result != frames) {
pr_err("Capture error: %d\n", (int)result);
set_fs(old_fs);
goto try_again;
}
set_fs(old_fs);
return 0;
}
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;
}
int ksnd_pcm_set_params(ksnd_pcm_t *pcm,
int nrchannels, int sampledepth, int samplerate,
int periodsize, int buffersize)
{
snd_pcm_substream_t *substream = pcm->substream;
snd_pcm_runtime_t *runtime = substream->runtime;
snd_pcm_hw_params_t *hw_params = NULL;
snd_pcm_sw_params_t *sw_params = NULL;
int err;
int format;
snd_mask_t mask;
int i;
void *hwbuf;
err = ksnd_pcm_hw_params_malloc(&hw_params);
if (0 != err)
goto failure;
sw_params = kmalloc(sizeof(*sw_params), GFP_KERNEL);
if (!sw_params)
{
err = -ENOMEM;
goto failure;
}
switch (sampledepth)
{
case 16:
format = SNDRV_PCM_FORMAT_S16_LE;
break;
case 24:
sampledepth = 32;
/*FALLTHRU*/
case 32:
format = SNDRV_PCM_FORMAT_S32_LE;
break;
default:
snd_printd("%s Unsupported sampledepth %d\n",
__FUNCTION__, sampledepth);
err = -EINVAL;
goto failure;
}
err = ksnd_pcm_hw_params_any(pcm, hw_params);
if (snd_BUG_ON(err < 0))
goto failure;
_snd_pcm_hw_param_setinteger(hw_params, SNDRV_PCM_HW_PARAM_PERIODS);
_snd_pcm_hw_param_min(hw_params, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
snd_mask_none(&mask);
snd_mask_set(&mask, SNDRV_PCM_ACCESS_RW_INTERLEAVED);
err =
snd_pcm_hw_param_mask(substream, hw_params,
SNDRV_PCM_HW_PARAM_ACCESS, &mask);
if (err < 0)
{
err = -EINVAL;
goto failure;
}
err =
snd_pcm_hw_param_set(substream, hw_params, SNDRV_PCM_HW_PARAM_RATE,
samplerate, 0);
if (snd_BUG_ON(err < 0))
goto failure;
err =
snd_pcm_hw_param_near(substream, hw_params,
SNDRV_PCM_HW_PARAM_CHANNELS, nrchannels,
NULL);
if (snd_BUG_ON(err < 0))
goto failure;
err =
snd_pcm_hw_param_near(substream, hw_params,
SNDRV_PCM_HW_PARAM_FORMAT, format, 0);
if (snd_BUG_ON(err < 0))
goto failure;
err =
snd_pcm_hw_param_near(substream, hw_params,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, periodsize,
NULL);
if (snd_BUG_ON(err < 0))
goto failure;
err =
snd_pcm_hw_param_near(substream, hw_params,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, buffersize,
NULL);
if (snd_BUG_ON(err < 0))
goto failure;
_ksnd_pcm_drop(substream);
/*now we re-use the 61937 control to enable the HW sync mechanism */
if (0 != (err = ksnd_pcm_hw_params(pcm, hw_params) < 0))
{
snd_printd("HW_PARAMS failed: for %d:%d code is %i\n",
substream->pcm->card->number, substream->pcm->device,
err);
goto failure;
}
memset(sw_params, 0, sizeof(*sw_params));
sw_params->start_threshold =
(runtime->buffer_size - (runtime->period_size * 2));
sw_params->stop_threshold = runtime->buffer_size;
sw_params->period_step = 1;
sw_params->sleep_min = 0;
sw_params->avail_min = runtime->period_size;
sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
sw_params->silence_threshold = runtime->period_size;
sw_params->silence_size = runtime->period_size;
if ((err =
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS,
sw_params)) < 0)
{
snd_printd("SW_PARAMS failed: for %d:%d code is %i\n",
substream->pcm->card->number, substream->pcm->device,
err);
goto failure;
}
if ((err = ksnd_pcm_prepare(pcm)) < 0)
goto failure;
if (pcm->hwareas[0].addr)
iounmap(pcm->hwareas[0].addr);
hwbuf = ioremap_nocache(runtime->dma_addr, runtime->dma_bytes);
for (i = 0; i < nrchannels; i++)
{
pcm->hwareas[i].addr = hwbuf;
pcm->hwareas[i].first = i * sampledepth;
pcm->hwareas[i].step = nrchannels * sampledepth;
}
nrchannels = _ksnd_pcm_hw_param_value(hw_params, SNDRV_PCM_HW_PARAM_CHANNELS, 0);
samplerate = _ksnd_pcm_hw_param_value(hw_params, SNDRV_PCM_HW_PARAM_RATE, 0);
periodsize = _ksnd_pcm_hw_param_value(hw_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 0);
buffersize = _ksnd_pcm_hw_param_value(hw_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0);
printk(KERN_DEBUG "ksound: Set parameters for hw:%d,%d to %d x %dhz with period %d (of %d)\n",
substream->pcm->card->number, substream->pcm->device,
nrchannels, samplerate, periodsize, buffersize);
err = 0;
failure:
if (hw_params)
ksnd_pcm_hw_params_free(hw_params);
if (sw_params)
kfree(sw_params);
return err;
}
static inline int _ksnd_pcm_pause(snd_pcm_substream_t *substream,
unsigned int push)
{
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PAUSE, (void *) push);
return 0;
}
static inline int _ksnd_pcm_drain(snd_pcm_substream_t *substream)
{
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
return 0;
}
