static int oxygen_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct oxygen *chip = snd_pcm_substream_chip(substream);
unsigned int channel = oxygen_substream_channel(substream);
int err;
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
if (err < 0)
return err;
oxygen_write32(chip, channel_base_registers[channel],
(u32)substream->runtime->dma_addr);
if (channel == PCM_MULTICH) {
oxygen_write32(chip, OXYGEN_DMA_MULTICH_COUNT,
params_buffer_bytes(hw_params) / 4 - 1);
oxygen_write32(chip, OXYGEN_DMA_MULTICH_TCOUNT,
params_period_bytes(hw_params) / 4 - 1);
} else {
oxygen_write16(chip, channel_base_registers[channel] + 4,
params_buffer_bytes(hw_params) / 4 - 1);
oxygen_write16(chip, channel_base_registers[channel] + 6,
params_period_bytes(hw_params) / 4 - 1);
}
return 0;
}
static snd_pcm_uframes_t oxygen_pointer(struct snd_pcm_substream *substream)
{
struct oxygen *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int channel = oxygen_substream_channel(substream);
u32 curr_addr;
/* no spinlock, this read should be atomic */
curr_addr = oxygen_read32(chip, channel_base_registers[channel]);
return bytes_to_frames(runtime, curr_addr - (u32)runtime->dma_addr);
}
static int oxygen_prepare(struct snd_pcm_substream *substream)
{
struct oxygen *chip = snd_pcm_substream_chip(substream);
unsigned int channel = oxygen_substream_channel(substream);
unsigned int channel_mask = 1 << channel;
spin_lock_irq(&chip->reg_lock);
oxygen_set_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);
oxygen_clear_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);
chip->interrupt_mask |= channel_mask;
oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
spin_unlock_irq(&chip->reg_lock);
return 0;
}
static int oxygen_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct oxygen *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_substream *s;
unsigned int mask = 0;
int pausing;
switch (cmd) {
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_SUSPEND:
pausing = 0;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
pausing = 1;
break;
default:
return -EINVAL;
}
snd_pcm_group_for_each_entry(s, substream) {
if (snd_pcm_substream_chip(s) == chip) {
mask |= 1 << oxygen_substream_channel(s);
snd_pcm_trigger_done(s, substream);
}
}
spin_lock(&chip->reg_lock);
if (!pausing) {
if (cmd == SNDRV_PCM_TRIGGER_START)
chip->pcm_running |= mask;
else
chip->pcm_running &= ~mask;
oxygen_write8(chip, OXYGEN_DMA_STATUS, chip->pcm_running);
} else {
if (cmd == SNDRV_PCM_TRIGGER_PAUSE_PUSH)
oxygen_set_bits8(chip, OXYGEN_DMA_PAUSE, mask);
else
oxygen_clear_bits8(chip, OXYGEN_DMA_PAUSE, mask);
}
spin_unlock(&chip->reg_lock);
return 0;
}
static int oxygen_close(struct snd_pcm_substream *substream)
{
struct oxygen *chip = snd_pcm_substream_chip(substream);
unsigned int channel = oxygen_substream_channel(substream);
mutex_lock(&chip->mutex);
chip->pcm_active &= ~(1 << channel);
if (channel == PCM_SPDIF) {
chip->controls[CONTROL_SPDIF_PCM]->vd[0].access |=
SNDRV_CTL_ELEM_ACCESS_INACTIVE;
snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |
SNDRV_CTL_EVENT_MASK_INFO,
&chip->controls[CONTROL_SPDIF_PCM]->id);
}
if (channel == PCM_SPDIF || channel == PCM_MULTICH)
oxygen_update_spdif_source(chip);
mutex_unlock(&chip->mutex);
chip->streams[channel] = NULL;
return 0;
}