es1688_lib.c

是关于linux2.5.1的完全源码

	period_bytes_min:	64,
	period_bytes_max:	65536,
	periods_min:		1,
	periods_max:		1024,
	fifo_size:		0,
};

static snd_pcm_hardware_t snd_es1688_capture =
{
	info:			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	formats:		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	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:	65536,
	period_bytes_min:	64,
	period_bytes_max:	65536,
	periods_min:		1,
	periods_max:		1024,
	fifo_size:		0,
};

/*

 */

static int snd_es1688_playback_open(snd_pcm_substream_t * substream)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;

	if (chip->capture_substream != NULL)
		return -EAGAIN;
	chip->playback_substream = substream;
	runtime->hw = snd_es1688_playback;
	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				      &hw_constraints_clocks);
	return 0;
}

static int snd_es1688_capture_open(snd_pcm_substream_t * substream)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;

	if (chip->playback_substream != NULL)
		return -EAGAIN;
	chip->capture_substream = substream;
	runtime->hw = snd_es1688_capture;
	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				      &hw_constraints_clocks);
	return 0;
}

static int snd_es1688_playback_close(snd_pcm_substream_t * substream)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);

	chip->playback_substream = NULL;
	return 0;
}

static int snd_es1688_capture_close(snd_pcm_substream_t * substream)
{
	es1688_t *chip = snd_pcm_substream_chip(substream);

	chip->capture_substream = NULL;
	return 0;
}

static int snd_es1688_free(es1688_t *chip)
{
	if (chip->res_port) {
		snd_es1688_init(chip, 0);
		release_resource(chip->res_port);
		kfree_nocheck(chip->res_port);
	}
	if (chip->irq >= 0)
		free_irq(chip->irq, (void *) chip);
	if (chip->dma8 >= 0) {
		disable_dma(chip->dma8);
		free_dma(chip->dma8);
	}
	snd_magic_kfree(chip);
	return 0;
}

static int snd_es1688_dev_free(snd_device_t *device)
{
	es1688_t *chip = snd_magic_cast(es1688_t, device->device_data, return -ENXIO);
	return snd_es1688_free(chip);
}

static const char *snd_es1688_chip_id(es1688_t *chip)
{
	static char tmp[16];
	sprintf(tmp, "ES%s688 rev %i", chip->hardware == ES1688_HW_688 ? "" : "1", chip->version & 0x0f);
	return tmp;
}

int snd_es1688_create(snd_card_t * card,
		      unsigned long port,
		      unsigned long mpu_port,
		      int irq,
		      int mpu_irq,
		      int dma8,
		      unsigned short hardware,
		      es1688_t **rchip)
{
	static snd_device_ops_t ops = {
		dev_free:	snd_es1688_dev_free,
	};
                                
	es1688_t *chip;
	int err;

	*rchip = NULL;
	chip = snd_magic_kcalloc(es1688_t, 0, GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;
	chip->irq = -1;
	chip->dma8 = -1;
	
	if ((chip->res_port = request_region(port + 4, 12, "ES1688")) == NULL) {
		snd_es1688_free(chip);
		return -EBUSY;
	}
	if (request_irq(irq, snd_es1688_interrupt, SA_INTERRUPT, "ES1688", (void *) chip)) {
		snd_es1688_free(chip);
		return -EBUSY;
	}
	chip->irq = irq;
	if (request_dma(dma8, "ES1688")) {
		snd_es1688_free(chip);
		return -EBUSY;
	}
	chip->dma8 = dma8;

	spin_lock_init(&chip->reg_lock);
	spin_lock_init(&chip->mixer_lock);
	chip->card = card;
	chip->port = port;
	mpu_port &= ~0x000f;
	if (mpu_port < 0x300 || mpu_port > 0x330)
		mpu_port = 0;
	chip->mpu_port = mpu_port;
	chip->mpu_irq = mpu_irq;
	chip->hardware = hardware;

	if ((err = snd_es1688_probe(chip)) < 0) {
		snd_es1688_free(chip);
		return err;
	}
	if ((err = snd_es1688_init(chip, 1)) < 0) {
		snd_es1688_free(chip);
		return err;
	}

	/* Register device */
	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
		snd_es1688_free(chip);
		return err;
	}

	*rchip = chip;
	return 0;
}

static snd_pcm_ops_t snd_es1688_playback_ops = {
	open:			snd_es1688_playback_open,
	close:			snd_es1688_playback_close,
	ioctl:			snd_es1688_ioctl,
	hw_params:		snd_es1688_hw_params,
	hw_free:		snd_es1688_hw_free,
	prepare:		snd_es1688_playback_prepare,
	trigger:		snd_es1688_playback_trigger,
	pointer:		snd_es1688_playback_pointer,
};

static snd_pcm_ops_t snd_es1688_capture_ops = {
	open:			snd_es1688_capture_open,
	close:			snd_es1688_capture_close,
	ioctl:			snd_es1688_ioctl,
	hw_params:		snd_es1688_hw_params,
	hw_free:		snd_es1688_hw_free,
	prepare:		snd_es1688_capture_prepare,
	trigger:		snd_es1688_capture_trigger,
	pointer:		snd_es1688_capture_pointer,
};

static void snd_es1688_pcm_free(snd_pcm_t *pcm)
{
	es1688_t *chip = snd_magic_cast(es1688_t, pcm->private_data, return);
	chip->pcm = NULL;
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

int snd_es1688_pcm(es1688_t * chip, int device, snd_pcm_t ** rpcm)
{
	snd_pcm_t *pcm;
	int err;

	if ((err = snd_pcm_new(chip->card, "ESx688", device, 1, 1, &pcm)) < 0)
		return err;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_es1688_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_es1688_capture_ops);

	pcm->private_data = chip;
	pcm->private_free = snd_es1688_pcm_free;
	pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
	sprintf(pcm->name, snd_es1688_chip_id(chip));
	chip->pcm = pcm;

	snd_pcm_lib_preallocate_isa_pages_for_all(pcm, 64*1024, 64*1024);

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

/*
 *  MIXER part
 */

static int snd_es1688_info_mux(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
	static char *texts[9] = {
		"Mic", "Mic Master", "CD", "AOUT",
		"Mic1", "Mix", "Line", "Master"
	};

	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	uinfo->count = 1;
	uinfo->value.enumerated.items = 8;
	if (uinfo->value.enumerated.item > 7)
		uinfo->value.enumerated.item = 7;
	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
	return 0;
}

static int snd_es1688_get_mux(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	es1688_t *chip = snd_kcontrol_chip(kcontrol);
	ucontrol->value.enumerated.item[0] = snd_es1688_mixer_read(chip, ES1688_REC_DEV) & 7;
	return 0;
}

static int snd_es1688_put_mux(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	es1688_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	unsigned char oval, nval;
	int change;
	
	if (ucontrol->value.enumerated.item[0] > 8)
		return -EINVAL;
	spin_lock_irqsave(&chip->reg_lock, flags);
	oval = snd_es1688_mixer_read(chip, ES1688_REC_DEV);
	nval = (ucontrol->value.enumerated.item[0] & 7) | (oval & ~15);
	change = nval != oval;
	if (change)
		snd_es1688_mixer_write(chip, ES1688_REC_DEV, nval);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return change;
}

#define ES1688_SINGLE(xname, xindex, reg, shift, mask, invert) \
{ iface: SNDRV_CTL_ELEM_IFACE_MIXER, name: xname, index: xindex, \
  info: snd_es1688_info_single, \
  get: snd_es1688_get_single, put: snd_es1688_put_single, \
  private_value: reg | (shift << 8) | (mask << 16) | (invert << 24) }

static int snd_es1688_info_single(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
	int mask = (kcontrol->private_value >> 16) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_es1688_get_single(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	es1688_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	
	spin_lock_irqsave(&chip->reg_lock, flags);
	ucontrol->value.integer.value[0] = (snd_es1688_mixer_read(chip, reg) >> shift) & mask;
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	if (invert)
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
	return 0;
}

static int snd_es1688_put_single(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	es1688_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	int change;
	unsigned char oval, nval;
	
	nval = (ucontrol->value.integer.value[0] & mask);
	if (invert)
		nval = mask - nval;
	nval <<= shift;
	spin_lock_irqsave(&chip->reg_lock, flags);
	oval = snd_es1688_mixer_read(chip, reg);
	nval = (oval & ~(mask << shift)) | nval;
	change = nval != oval;
	if (change)
		snd_es1688_mixer_write(chip, reg, nval);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return change;
}

#define ES1688_DOUBLE(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
{ iface: SNDRV_CTL_ELEM_IFACE_MIXER, name: xname, index: xindex, \
  info: snd_es1688_info_double, \
  get: snd_es1688_get_double, put: snd_es1688_put_double, \
  private_value: left_reg | (right_reg << 8) | (shift_left << 16) | (shift_right << 19) | (mask << 24) | (invert << 22) }

static int snd_es1688_info_double(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
	int mask = (kcontrol->private_value >> 24) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_es1688_get_double(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	es1688_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int left_reg = kcontrol->private_value & 0xff;
	int right_reg = (kcontrol->private_value >> 8) & 0xff;
	int shift_left = (kcontrol->private_value >> 16) & 0x07;
	int shift_right = (kcontrol->private_value >> 19) & 0x07;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	int invert = (kcontrol->private_value >> 22) & 1;
	unsigned char left, right;
	
	spin_lock_irqsave(&chip->reg_lock, flags);
	if (left_reg < 0xa0)
		left = snd_es1688_mixer_read(chip, left_reg);
	else
		left = snd_es1688_read(chip, left_reg);
	if (left_reg != right_reg) {
		if (right_reg < 0xa0) 
			right = snd_es1688_mixer_read(chip, right_reg);
		else
			right = snd_es1688_read(chip, right_reg);
	} else
		right = left;
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	ucontrol->value.integer.value[0] = (left >> shift_left) & mask;
	ucontrol->value.integer.value[1] = (right >> shift_right) & mask;
	if (invert) {
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
		ucontrol->value.integer.value[1] = mask - ucontrol->value.integer.value[1];
	}
	return 0;
}

static int snd_es1688_put_double(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	es1688_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int left_reg = kcontrol->private_value & 0xff;
	int right_reg = (kcontrol->private_value >> 8) & 0xff;
	int shift_left = (kcontrol->private_value >> 16) & 0x07;
	int shift_right = (kcontrol->private_value >> 19) & 0x07;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	int invert = (kcontrol->private_value >> 22) & 1;
	int change;
	unsigned char val1, val2, oval1, oval2;
	
	val1 = ucontrol->value.integer.value[0] & mask;
	val2 = ucontrol->value.integer.value[1] & mask;
	if (invert) {
		val1 = mask - val1;
		val2 = mask - val2;
	}
	val1 <<= shift_left;
	val2 <<= shift_right;
	spin_lock_irqsave(&chip->reg_lock, flags);
	if (left_reg != right_reg) {
		if (left_reg < 0xa0)
			oval1 = snd_es1688_mixer_read(chip, left_reg);
		else
			oval1 = snd_es1688_read(chip, left_reg);
		if (right_reg < 0xa0)
			oval2 = snd_es1688_mixer_read(chip, right_reg);
		else
			oval2 = snd_es1688_read(chip, right_reg);
		val1 = (oval1 & ~(mask << shift_left)) | val1;
		val2 = (oval2 & ~(mask << shift_right)) | val2;
		change = val1 != oval1 || val2 != oval2;
		if (change) {
			if (left_reg < 0xa0)
				snd_es1688_mixer_write(chip, left_reg, val1);
			else
				snd_es1688_write(chip, left_reg, val1);
			if (right_reg < 0xa0)
				snd_es1688_mixer_write(chip, right_reg, val1);
			else
				snd_es1688_write(chip, right_reg, val1);
		}
	} else {
		if (left_reg < 0xa0)
			oval1 = snd_es1688_mixer_read(chip, left_reg);
		else
			oval1 = snd_es1688_read(chip, left_reg);
		val1 = (oval1 & ~((mask << shift_left) | (mask << shift_right))) | val1 | val2;
		change = val1 != oval1;
		if (change) {
			if (left_reg < 0xa0)
				snd_es1688_mixer_write(chip, left_reg, val1);
			else
				snd_es1688_write(chip, left_reg, val1);
		}
			
	}
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return change;
}

#define ES1688_CONTROLS (sizeof(snd_es1688_controls)/sizeof(snd_kcontrol_new_t))

static snd_kcontrol_new_t snd_es1688_controls[] = {
ES1688_DOUBLE("Master Playback Volume", 0, ES1688_MASTER_DEV, ES1688_MASTER_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("PCM Playback Volume", 0, ES1688_PCM_DEV, ES1688_PCM_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("Line Playback Volume", 0, ES1688_LINE_DEV, ES1688_LINE_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("CD Playback Volume", 0, ES1688_CD_DEV, ES1688_CD_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("FM Playback Volume", 0, ES1688_FM_DEV, ES1688_FM_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("Mic Playback Volume", 0, ES1688_MIC_DEV, ES1688_MIC_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("Aux Playback Volume", 0, ES1688_AUX_DEV, ES1688_AUX_DEV, 4, 0, 15, 0),
ES1688_SINGLE("PC Speaker Playback Volume", 0, ES1688_SPEAKER_DEV, 0, 7, 0),
ES1688_DOUBLE("Capture Volume", 0, ES1688_RECLEV_DEV, ES1688_RECLEV_DEV, 4, 0, 15, 0),
ES1688_SINGLE("Capture Switch", 0, ES1688_REC_DEV, 4, 1, 1),
{
	iface: SNDRV_CTL_ELEM_IFACE_MIXER,
	name: "Capture Source",
	info: snd_es1688_info_mux,
	get: snd_es1688_get_mux,
	put: snd_es1688_put_mux,
},
};

#define ES1688_INIT_TABLE_SIZE (sizeof(snd_es1688_init_table)/2)

static unsigned char snd_es1688_init_table[][2] = {
	{ ES1688_MASTER_DEV, 0 },
	{ ES1688_PCM_DEV, 0 },
	{ ES1688_LINE_DEV, 0 },
	{ ES1688_CD_DEV, 0 },
	{ ES1688_FM_DEV, 0 },
	{ ES1688_MIC_DEV, 0 },
	{ ES1688_AUX_DEV, 0 },
	{ ES1688_SPEAKER_DEV, 0 },
	{ ES1688_RECLEV_DEV, 0 },
	{ ES1688_REC_DEV, 0x17 }
};
                                        
int snd_es1688_mixer(es1688_t *chip)
{
	snd_card_t *card;
	int err, idx;
	unsigned char reg, val;

	snd_assert(chip != NULL && chip->card != NULL, return -EINVAL);

	card = chip->card;

	strcpy(card->mixername, snd_es1688_chip_id(chip));

	for (idx = 0; idx < ES1688_CONTROLS; idx++) {
		if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_es1688_controls[idx], chip))) < 0)
			return err;
	}
	for (idx = 0; idx < ES1688_INIT_TABLE_SIZE; idx++) {
		reg = snd_es1688_init_table[idx][0];
		val = snd_es1688_init_table[idx][1];
		if (reg < 0xa0)
			snd_es1688_mixer_write(chip, reg, val);
		else
			snd_es1688_write(chip, reg, val);
	}
	return 0;
}

EXPORT_SYMBOL(snd_es1688_mixer_write);
EXPORT_SYMBOL(snd_es1688_mixer_read);
EXPORT_SYMBOL(snd_es1688_interrupt);
EXPORT_SYMBOL(snd_es1688_create);
EXPORT_SYMBOL(snd_es1688_pcm);
EXPORT_SYMBOL(snd_es1688_mixer);

/*
 *  INIT part
 */

static int __init alsa_es1688_init(void)
{
	return 0;
}

static void __exit alsa_es1688_exit(void)
{
}

module_init(alsa_es1688_init)
module_exit(alsa_es1688_exit)