cs4281.c

linux 内核源代码

static snd_pcm_uframes_t snd_cs4281_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct cs4281_dma *dma = runtime->private_data;
	struct cs4281 *chip = snd_pcm_substream_chip(substream);

	// printk("DCC = 0x%x, buffer_size = 0x%x, jiffies = %li\n", snd_cs4281_peekBA0(chip, dma->regDCC), runtime->buffer_size, jiffies);
	return runtime->buffer_size -
	       snd_cs4281_peekBA0(chip, dma->regDCC) - 1;
}

static struct snd_pcm_hardware snd_cs4281_playback =
{
	.info =			SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_INTERLEAVED |
				SNDRV_PCM_INFO_MMAP_VALID |
				SNDRV_PCM_INFO_PAUSE |
				SNDRV_PCM_INFO_RESUME,
	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
				SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
				SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
				SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
				SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE,
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		4000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(512*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(512*1024),
	.periods_min =		1,
	.periods_max =		2,
	.fifo_size =		CS4281_FIFO_SIZE,
};

static struct snd_pcm_hardware snd_cs4281_capture =
{
	.info =			SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_INTERLEAVED |
				SNDRV_PCM_INFO_MMAP_VALID |
				SNDRV_PCM_INFO_PAUSE |
				SNDRV_PCM_INFO_RESUME,
	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
				SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
				SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
				SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
				SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE,
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		4000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(512*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(512*1024),
	.periods_min =		1,
	.periods_max =		2,
	.fifo_size =		CS4281_FIFO_SIZE,
};

static int snd_cs4281_playback_open(struct snd_pcm_substream *substream)
{
	struct cs4281 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct cs4281_dma *dma;

	dma = &chip->dma[0];
	dma->substream = substream;
	dma->left_slot = 0;
	dma->right_slot = 1;
	runtime->private_data = dma;
	runtime->hw = snd_cs4281_playback;
	/* should be detected from the AC'97 layer, but it seems
	   that although CS4297A rev B reports 18-bit ADC resolution,
	   samples are 20-bit */
	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 20);
	return 0;
}

static int snd_cs4281_capture_open(struct snd_pcm_substream *substream)
{
	struct cs4281 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct cs4281_dma *dma;

	dma = &chip->dma[1];
	dma->substream = substream;
	dma->left_slot = 10;
	dma->right_slot = 11;
	runtime->private_data = dma;
	runtime->hw = snd_cs4281_capture;
	/* should be detected from the AC'97 layer, but it seems
	   that although CS4297A rev B reports 18-bit ADC resolution,
	   samples are 20-bit */
	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 20);
	return 0;
}

static int snd_cs4281_playback_close(struct snd_pcm_substream *substream)
{
	struct cs4281_dma *dma = substream->runtime->private_data;

	dma->substream = NULL;
	return 0;
}

static int snd_cs4281_capture_close(struct snd_pcm_substream *substream)
{
	struct cs4281_dma *dma = substream->runtime->private_data;

	dma->substream = NULL;
	return 0;
}

static struct snd_pcm_ops snd_cs4281_playback_ops = {
	.open =		snd_cs4281_playback_open,
	.close =	snd_cs4281_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_cs4281_hw_params,
	.hw_free =	snd_cs4281_hw_free,
	.prepare =	snd_cs4281_playback_prepare,
	.trigger =	snd_cs4281_trigger,
	.pointer =	snd_cs4281_pointer,
};

static struct snd_pcm_ops snd_cs4281_capture_ops = {
	.open =		snd_cs4281_capture_open,
	.close =	snd_cs4281_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_cs4281_hw_params,
	.hw_free =	snd_cs4281_hw_free,
	.prepare =	snd_cs4281_capture_prepare,
	.trigger =	snd_cs4281_trigger,
	.pointer =	snd_cs4281_pointer,
};

static int __devinit snd_cs4281_pcm(struct cs4281 * chip, int device,
				    struct snd_pcm ** rpcm)
{
	struct snd_pcm *pcm;
	int err;

	if (rpcm)
		*rpcm = NULL;
	err = snd_pcm_new(chip->card, "CS4281", device, 1, 1, &pcm);
	if (err < 0)
		return err;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_cs4281_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cs4281_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = 0;
	strcpy(pcm->name, "CS4281");
	chip->pcm = pcm;

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
					      snd_dma_pci_data(chip->pci), 64*1024, 512*1024);

	if (rpcm)
		*rpcm = pcm;
	return 0;
}

/*
 *  Mixer section
 */

#define CS_VOL_MASK	0x1f

static int snd_cs4281_info_volume(struct snd_kcontrol *kcontrol,
				  struct snd_ctl_elem_info *uinfo)
{
	uinfo->type              = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count             = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = CS_VOL_MASK;
	return 0;
}
 
static int snd_cs4281_get_volume(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct cs4281 *chip = snd_kcontrol_chip(kcontrol);
	int regL = (kcontrol->private_value >> 16) & 0xffff;
	int regR = kcontrol->private_value & 0xffff;
	int volL, volR;

	volL = CS_VOL_MASK - (snd_cs4281_peekBA0(chip, regL) & CS_VOL_MASK);
	volR = CS_VOL_MASK - (snd_cs4281_peekBA0(chip, regR) & CS_VOL_MASK);

	ucontrol->value.integer.value[0] = volL;
	ucontrol->value.integer.value[1] = volR;
	return 0;
}

static int snd_cs4281_put_volume(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct cs4281 *chip = snd_kcontrol_chip(kcontrol);
	int change = 0;
	int regL = (kcontrol->private_value >> 16) & 0xffff;
	int regR = kcontrol->private_value & 0xffff;
	int volL, volR;

	volL = CS_VOL_MASK - (snd_cs4281_peekBA0(chip, regL) & CS_VOL_MASK);
	volR = CS_VOL_MASK - (snd_cs4281_peekBA0(chip, regR) & CS_VOL_MASK);

	if (ucontrol->value.integer.value[0] != volL) {
		volL = CS_VOL_MASK - (ucontrol->value.integer.value[0] & CS_VOL_MASK);
		snd_cs4281_pokeBA0(chip, regL, volL);
		change = 1;
	}
	if (ucontrol->value.integer.value[1] != volR) {
		volR = CS_VOL_MASK - (ucontrol->value.integer.value[1] & CS_VOL_MASK);
		snd_cs4281_pokeBA0(chip, regR, volR);
		change = 1;
	}
	return change;
}

static const DECLARE_TLV_DB_SCALE(db_scale_dsp, -4650, 150, 0);

static struct snd_kcontrol_new snd_cs4281_fm_vol = 
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Synth Playback Volume",
	.info = snd_cs4281_info_volume, 
	.get = snd_cs4281_get_volume,
	.put = snd_cs4281_put_volume, 
	.private_value = ((BA0_FMLVC << 16) | BA0_FMRVC),
	.tlv = { .p = db_scale_dsp },
};

static struct snd_kcontrol_new snd_cs4281_pcm_vol = 
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Stream Playback Volume",
	.info = snd_cs4281_info_volume, 
	.get = snd_cs4281_get_volume,
	.put = snd_cs4281_put_volume, 
	.private_value = ((BA0_PPLVC << 16) | BA0_PPRVC),
	.tlv = { .p = db_scale_dsp },
};

static void snd_cs4281_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
{
	struct cs4281 *chip = bus->private_data;
	chip->ac97_bus = NULL;
}

static void snd_cs4281_mixer_free_ac97(struct snd_ac97 *ac97)
{
	struct cs4281 *chip = ac97->private_data;
	if (ac97->num)
		chip->ac97_secondary = NULL;
	else
		chip->ac97 = NULL;
}

static int __devinit snd_cs4281_mixer(struct cs4281 * chip)
{
	struct snd_card *card = chip->card;
	struct snd_ac97_template ac97;
	int err;
	static struct snd_ac97_bus_ops ops = {
		.write = snd_cs4281_ac97_write,
		.read = snd_cs4281_ac97_read,
	};

	if ((err = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus)) < 0)
		return err;
	chip->ac97_bus->private_free = snd_cs4281_mixer_free_ac97_bus;

	memset(&ac97, 0, sizeof(ac97));
	ac97.private_data = chip;
	ac97.private_free = snd_cs4281_mixer_free_ac97;
	if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
		return err;
	if (chip->dual_codec) {
		ac97.num = 1;
		if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97_secondary)) < 0)
			return err;
	}
	if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_cs4281_fm_vol, chip))) < 0)
		return err;
	if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_cs4281_pcm_vol, chip))) < 0)
		return err;
	return 0;
}


/*
 * proc interface
 */

static void snd_cs4281_proc_read(struct snd_info_entry *entry, 
				  struct snd_info_buffer *buffer)
{
	struct cs4281 *chip = entry->private_data;

	snd_iprintf(buffer, "Cirrus Logic CS4281\n\n");
	snd_iprintf(buffer, "Spurious half IRQs   : %u\n", chip->spurious_dhtc_irq);
	snd_iprintf(buffer, "Spurious end IRQs    : %u\n", chip->spurious_dtc_irq);
}

static long snd_cs4281_BA0_read(struct snd_info_entry *entry,
				void *file_private_data,
				struct file *file, char __user *buf,
				unsigned long count, unsigned long pos)
{
	long size;
	struct cs4281 *chip = entry->private_data;
	
	size = count;
	if (pos + size > CS4281_BA0_SIZE)
		size = (long)CS4281_BA0_SIZE - pos;
	if (size > 0) {
		if (copy_to_user_fromio(buf, chip->ba0 + pos, size))
			return -EFAULT;
	}
	return size;
}

static long snd_cs4281_BA1_read(struct snd_info_entry *entry,
				void *file_private_data,
				struct file *file, char __user *buf,
				unsigned long count, unsigned long pos)
{
	long size;
	struct cs4281 *chip = entry->private_data;
	
	size = count;
	if (pos + size > CS4281_BA1_SIZE)
		size = (long)CS4281_BA1_SIZE - pos;
	if (size > 0) {
		if (copy_to_user_fromio(buf, chip->ba1 + pos, size))
			return -EFAULT;
	}
	return size;
}

static struct snd_info_entry_ops snd_cs4281_proc_ops_BA0 = {
	.read = snd_cs4281_BA0_read,
};

static struct snd_info_entry_ops snd_cs4281_proc_ops_BA1 = {
	.read = snd_cs4281_BA1_read,
};

static void __devinit snd_cs4281_proc_init(struct cs4281 * chip)
{
	struct snd_info_entry *entry;

	if (! snd_card_proc_new(chip->card, "cs4281", &entry))
		snd_info_set_text_ops(entry, chip, snd_cs4281_proc_read);
	if (! snd_card_proc_new(chip->card, "cs4281_BA0", &entry)) {
		entry->content = SNDRV_INFO_CONTENT_DATA;
		entry->private_data = chip;
		entry->c.ops = &snd_cs4281_proc_ops_BA0;
		entry->size = CS4281_BA0_SIZE;
	}
	if (! snd_card_proc_new(chip->card, "cs4281_BA1", &entry)) {
		entry->content = SNDRV_INFO_CONTENT_DATA;
		entry->private_data = chip;
		entry->c.ops = &snd_cs4281_proc_ops_BA1;
		entry->size = CS4281_BA1_SIZE;
	}
}

/*
 * joystick support
 */

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))

static void snd_cs4281_gameport_trigger(struct gameport *gameport)
{
	struct cs4281 *chip = gameport_get_port_data(gameport);

	snd_assert(chip, return);
	snd_cs4281_pokeBA0(chip, BA0_JSPT, 0xff);
}

static unsigned char snd_cs4281_gameport_read(struct gameport *gameport)
{
	struct cs4281 *chip = gameport_get_port_data(gameport);

	snd_assert(chip, return 0);
	return snd_cs4281_peekBA0(chip, BA0_JSPT);
}

#ifdef COOKED_MODE
static int snd_cs4281_gameport_cooked_read(struct gameport *gameport,
					   int *axes, int *buttons)
{
	struct cs4281 *chip = gameport_get_port_data(gameport);
	unsigned js1, js2, jst;
	
	snd_assert(chip, return 0);

	js1 = snd_cs4281_peekBA0(chip, BA0_JSC1);
	js2 = snd_cs4281_peekBA0(chip, BA0_JSC2);
	jst = snd_cs4281_peekBA0(chip, BA0_JSPT);
	
	*buttons = (~jst >> 4) & 0x0F; 
	
	axes[0] = ((js1 & JSC1_Y1V_MASK) >> JSC1_Y1V_SHIFT) & 0xFFFF;
	axes[1] = ((js1 & JSC1_X1V_MASK) >> JSC1_X1V_SHIFT) & 0xFFFF;
	axes[2] = ((js2 & JSC2_Y2V_MASK) >> JSC2_Y2V_SHIFT) & 0xFFFF;
	axes[3] = ((js2 & JSC2_X2V_MASK) >> JSC2_X2V_SHIFT) & 0xFFFF;

	for (jst = 0; jst < 4; ++jst)