bt87x.c

trident tm5600的linux驱动

{
	struct snd_bt87x *chip = dev_id;
	unsigned int status, irq_status;

	status = snd_bt87x_readl(chip, REG_INT_STAT);
	irq_status = status & chip->interrupt_mask;
	if (!irq_status)
		return IRQ_NONE;
	snd_bt87x_writel(chip, REG_INT_STAT, irq_status);

	if (irq_status & ERROR_INTERRUPTS) {
		if (irq_status & (INT_FBUS | INT_FTRGT))
			snd_printk(KERN_WARNING "FIFO overrun, status %#08x\n", status);
		if (irq_status & INT_OCERR)
			snd_printk(KERN_ERR "internal RISC error, status %#08x\n", status);
		if (irq_status & (INT_PPERR | INT_RIPERR | INT_PABORT))
			snd_bt87x_pci_error(chip, irq_status);
	}
	if ((irq_status & INT_RISCI) && (chip->reg_control & CTL_ACAP_EN)) {
		int current_block, irq_block;

		/* assume that exactly one line has been recorded */
		chip->current_line = (chip->current_line + 1) % chip->lines;
		/* but check if some interrupts have been skipped */
		current_block = chip->current_line * 16 / chip->lines;
		irq_block = status >> INT_RISCS_SHIFT;
		if (current_block != irq_block)
			chip->current_line = (irq_block * chip->lines + 15) / 16;

		snd_pcm_period_elapsed(chip->substream);
	}
	return IRQ_HANDLED;
}

static struct snd_pcm_hardware snd_bt87x_digital_hw = {
	.info = SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP_VALID,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = 0, /* set at runtime */
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = 255 * 4092,
	.period_bytes_min = 32,
	.period_bytes_max = 4092,
	.periods_min = 2,
	.periods_max = 255,
};

static struct snd_pcm_hardware snd_bt87x_analog_hw = {
	.info = SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP_VALID,
	.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
	.rates = SNDRV_PCM_RATE_KNOT,
	.rate_min = ANALOG_CLOCK / CLOCK_DIV_MAX,
	.rate_max = ANALOG_CLOCK / CLOCK_DIV_MIN,
	.channels_min = 1,
	.channels_max = 1,
	.buffer_bytes_max = 255 * 4092,
	.period_bytes_min = 32,
	.period_bytes_max = 4092,
	.periods_min = 2,
	.periods_max = 255,
};

static int snd_bt87x_set_digital_hw(struct snd_bt87x *chip, struct snd_pcm_runtime *runtime)
{
	chip->reg_control |= CTL_DA_IOM_DA | CTL_A_PWRDN;
	runtime->hw = snd_bt87x_digital_hw;
	runtime->hw.rates = snd_pcm_rate_to_rate_bit(chip->board.dig_rate);
	runtime->hw.rate_min = chip->board.dig_rate;
	runtime->hw.rate_max = chip->board.dig_rate;
	return 0;
}

static int snd_bt87x_set_analog_hw(struct snd_bt87x *chip, struct snd_pcm_runtime *runtime)
{
	static struct snd_ratnum analog_clock = {
		.num = ANALOG_CLOCK,
		.den_min = CLOCK_DIV_MIN,
		.den_max = CLOCK_DIV_MAX,
		.den_step = 1
	};
	static struct snd_pcm_hw_constraint_ratnums constraint_rates = {
		.nrats = 1,
		.rats = &analog_clock
	};

	chip->reg_control &= ~(CTL_DA_IOM_DA | CTL_A_PWRDN);
	runtime->hw = snd_bt87x_analog_hw;
	return snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
					     &constraint_rates);
}

static int snd_bt87x_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	if (test_and_set_bit(0, &chip->opened))
		return -EBUSY;

	if (substream->pcm->device == DEVICE_DIGITAL)
		err = snd_bt87x_set_digital_hw(chip, runtime);
	else
		err = snd_bt87x_set_analog_hw(chip, runtime);
	if (err < 0)
		goto _error;

	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	if (err < 0)
		goto _error;

	chip->substream = substream;
	return 0;

_error:
	clear_bit(0, &chip->opened);
	smp_mb__after_clear_bit();
	return err;
}

static int snd_bt87x_close(struct snd_pcm_substream *substream)
{
	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);

	spin_lock_irq(&chip->reg_lock);
	chip->reg_control |= CTL_A_PWRDN;
	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
	spin_unlock_irq(&chip->reg_lock);

	chip->substream = NULL;
	clear_bit(0, &chip->opened);
	smp_mb__after_clear_bit();
	return 0;
}

static int snd_bt87x_hw_params(struct snd_pcm_substream *substream,
			       struct snd_pcm_hw_params *hw_params)
{
	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
	int err;

	err = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (err < 0)
		return err;
	return snd_bt87x_create_risc(chip, substream,
				     params_periods(hw_params),
				     params_period_bytes(hw_params));
}

static int snd_bt87x_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);

	snd_bt87x_free_risc(chip);
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int snd_bt87x_prepare(struct snd_pcm_substream *substream)
{
	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int decimation;

	spin_lock_irq(&chip->reg_lock);
	chip->reg_control &= ~(CTL_DA_SDR_MASK | CTL_DA_SBR);
	decimation = (ANALOG_CLOCK + runtime->rate / 4) / runtime->rate;
	chip->reg_control |= decimation << CTL_DA_SDR_SHIFT;
	if (runtime->format == SNDRV_PCM_FORMAT_S8)
		chip->reg_control |= CTL_DA_SBR;
	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
	spin_unlock_irq(&chip->reg_lock);
	return 0;
}

static int snd_bt87x_start(struct snd_bt87x *chip)
{
	spin_lock(&chip->reg_lock);
	chip->current_line = 0;
	chip->reg_control |= CTL_FIFO_ENABLE | CTL_RISC_ENABLE | CTL_ACAP_EN;
	snd_bt87x_writel(chip, REG_RISC_STRT_ADD, chip->dma_risc.addr);
	snd_bt87x_writel(chip, REG_PACKET_LEN,
			 chip->line_bytes | (chip->lines << 16));
	snd_bt87x_writel(chip, REG_INT_MASK, chip->interrupt_mask);
	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
	spin_unlock(&chip->reg_lock);
	return 0;
}

static int snd_bt87x_stop(struct snd_bt87x *chip)
{
	spin_lock(&chip->reg_lock);
	chip->reg_control &= ~(CTL_FIFO_ENABLE | CTL_RISC_ENABLE | CTL_ACAP_EN);
	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
	snd_bt87x_writel(chip, REG_INT_MASK, 0);
	snd_bt87x_writel(chip, REG_INT_STAT, MY_INTERRUPTS);
	spin_unlock(&chip->reg_lock);
	return 0;
}

static int snd_bt87x_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		return snd_bt87x_start(chip);
	case SNDRV_PCM_TRIGGER_STOP:
		return snd_bt87x_stop(chip);
	default:
		return -EINVAL;
	}
}

static snd_pcm_uframes_t snd_bt87x_pointer(struct snd_pcm_substream *substream)
{
	struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	return (snd_pcm_uframes_t)bytes_to_frames(runtime, chip->current_line * chip->line_bytes);
}

static struct snd_pcm_ops snd_bt87x_pcm_ops = {
	.open = snd_bt87x_pcm_open,
	.close = snd_bt87x_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_bt87x_hw_params,
	.hw_free = snd_bt87x_hw_free,
	.prepare = snd_bt87x_prepare,
	.trigger = snd_bt87x_trigger,
	.pointer = snd_bt87x_pointer,
	.page = snd_pcm_sgbuf_ops_page,
};

static int snd_bt87x_capture_volume_info(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_info *info)
{
	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	info->count = 1;
	info->value.integer.min = 0;
	info->value.integer.max = 15;
	return 0;
}

static int snd_bt87x_capture_volume_get(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *value)
{
	struct snd_bt87x *chip = snd_kcontrol_chip(kcontrol);

	value->value.integer.value[0] = (chip->reg_control & CTL_A_GAIN_MASK) >> CTL_A_GAIN_SHIFT;
	return 0;
}

static int snd_bt87x_capture_volume_put(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *value)
{
	struct snd_bt87x *chip = snd_kcontrol_chip(kcontrol);
	u32 old_control;
	int changed;

	spin_lock_irq(&chip->reg_lock);
	old_control = chip->reg_control;
	chip->reg_control = (chip->reg_control & ~CTL_A_GAIN_MASK)
		| (value->value.integer.value[0] << CTL_A_GAIN_SHIFT);
	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
	changed = old_control != chip->reg_control;
	spin_unlock_irq(&chip->reg_lock);
	return changed;
}

static struct snd_kcontrol_new snd_bt87x_capture_volume = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Capture Volume",
	.info = snd_bt87x_capture_volume_info,
	.get = snd_bt87x_capture_volume_get,
	.put = snd_bt87x_capture_volume_put,
};

#define snd_bt87x_capture_boost_info	snd_ctl_boolean_mono_info

static int snd_bt87x_capture_boost_get(struct snd_kcontrol *kcontrol,
				       struct snd_ctl_elem_value *value)
{
	struct snd_bt87x *chip = snd_kcontrol_chip(kcontrol);

	value->value.integer.value[0] = !! (chip->reg_control & CTL_A_G2X);
	return 0;
}

static int snd_bt87x_capture_boost_put(struct snd_kcontrol *kcontrol,
				       struct snd_ctl_elem_value *value)
{
	struct snd_bt87x *chip = snd_kcontrol_chip(kcontrol);
	u32 old_control;
	int changed;

	spin_lock_irq(&chip->reg_lock);
	old_control = chip->reg_control;
	chip->reg_control = (chip->reg_control & ~CTL_A_G2X)
		| (value->value.integer.value[0] ? CTL_A_G2X : 0);
	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
	changed = chip->reg_control != old_control;
	spin_unlock_irq(&chip->reg_lock);
	return changed;
}

static struct snd_kcontrol_new snd_bt87x_capture_boost = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Capture Boost",
	.info = snd_bt87x_capture_boost_info,
	.get = snd_bt87x_capture_boost_get,
	.put = snd_bt87x_capture_boost_put,
};

static int snd_bt87x_capture_source_info(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_info *info)
{
	static char *texts[3] = {"TV Tuner", "FM", "Mic/Line"};

	info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	info->count = 1;
	info->value.enumerated.items = 3;
	if (info->value.enumerated.item > 2)
		info->value.enumerated.item = 2;
	strcpy(info->value.enumerated.name, texts[info->value.enumerated.item]);
	return 0;
}

static int snd_bt87x_capture_source_get(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *value)
{
	struct snd_bt87x *chip = snd_kcontrol_chip(kcontrol);