static inline u8 snd_als4_cr_read(struct snd_sb *chip,
enum als4k_cr_t reg)
{
/* NOTE: assumes chip->mixer_lock to be locked externally already! */
return snd_sbmixer_read(chip, reg | 0xc0);
}
static int snd_sb8_hw_constraint_channels_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval *r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
if (r->min > SB8_RATE(22050) || r->max <= SB8_RATE(11025)) {
struct snd_interval t = { .min = 1, .max = 1 };
return snd_interval_refine(hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS), &t);
}
return 0;
}
static int snd_sb8_playback_prepare(struct snd_pcm_substream *substream)
{
unsigned long flags;
struct snd_sb *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int mixreg, rate, size, count;
unsigned char format;
unsigned char stereo = runtime->channels > 1;
int dma;
rate = runtime->rate;
switch (chip->hardware) {
case SB_HW_JAZZ16:
if (runtime->format == SNDRV_PCM_FORMAT_S16_LE) {
if (chip->mode & SB_MODE_CAPTURE_16)
return -EBUSY;
else
chip->mode |= SB_MODE_PLAYBACK_16;
}
chip->playback_format = SB_DSP_LO_OUTPUT_AUTO;
break;
case SB_HW_PRO:
if (runtime->channels > 1) {
if (snd_BUG_ON(rate != SB8_RATE(11025) &&
rate != SB8_RATE(22050)))
return -EINVAL;
chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
break;
}
/* fallthru */
case SB_HW_201:
if (rate > 23000) {
chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
break;
}
/* fallthru */
case SB_HW_20:
chip->playback_format = SB_DSP_LO_OUTPUT_AUTO;
break;
case SB_HW_10:
chip->playback_format = SB_DSP_OUTPUT;
break;
default:
return -EINVAL;
}
if (chip->mode & SB_MODE_PLAYBACK_16) {
format = stereo ? SB_DSP_STEREO_16BIT : SB_DSP_MONO_16BIT;
dma = chip->dma16;
} else {
format = stereo ? SB_DSP_STEREO_8BIT : SB_DSP_MONO_8BIT;
chip->mode |= SB_MODE_PLAYBACK_8;
dma = chip->dma8;
}
size = chip->p_dma_size = snd_pcm_lib_buffer_bytes(substream);
count = chip->p_period_size = snd_pcm_lib_period_bytes(substream);
spin_lock_irqsave(&chip->reg_lock, flags);
snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON);
if (chip->hardware == SB_HW_JAZZ16)
snd_sbdsp_command(chip, format);
else if (stereo) {
/* set playback stereo mode */
spin_lock(&chip->mixer_lock);
mixreg = snd_sbmixer_read(chip, SB_DSP_STEREO_SW);
snd_sbmixer_write(chip, SB_DSP_STEREO_SW, mixreg | 0x02);
spin_unlock(&chip->mixer_lock);
/* Soundblaster hardware programming reference guide, 3-23 */
snd_sbdsp_command(chip, SB_DSP_DMA8_EXIT);
runtime->dma_area[0] = 0x80;
snd_dma_program(dma, runtime->dma_addr, 1, DMA_MODE_WRITE);
/* force interrupt */
snd_sbdsp_command(chip, SB_DSP_OUTPUT);
snd_sbdsp_command(chip, 0);
snd_sbdsp_command(chip, 0);
}
snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
if (stereo) {
snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
spin_lock(&chip->mixer_lock);
/* save output filter status and turn it off */
mixreg = snd_sbmixer_read(chip, SB_DSP_PLAYBACK_FILT);
snd_sbmixer_write(chip, SB_DSP_PLAYBACK_FILT, mixreg | 0x20);
spin_unlock(&chip->mixer_lock);
/* just use force_mode16 for temporary storate... */
chip->force_mode16 = mixreg;
} else {
snd_sbdsp_command(chip, 256 - runtime->rate_den);
}
if (chip->playback_format != SB_DSP_OUTPUT) {
if (chip->mode & SB_MODE_PLAYBACK_16)
count /= 2;
count--;
snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
snd_sbdsp_command(chip, count & 0xff);
snd_sbdsp_command(chip, count >> 8);
}
spin_unlock_irqrestore(&chip->reg_lock, flags);
snd_dma_program(dma, runtime->dma_addr,
size, DMA_MODE_WRITE | DMA_AUTOINIT);
return 0;
}