cs8427.c

Linux ARM9 2440 Sound i2C 驱动程序开发

	snd_assert(cs8427, return);
	chip = cs8427->private_data;
	snd_i2c_lock(cs8427->bus);
	chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
	udelay(200);
	chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
	udelay(200);
	snd_i2c_unlock(cs8427->bus);
	end_time = jiffies + chip->reset_timeout;
	while (time_after_eq(end_time, jiffies)) {
		snd_i2c_lock(cs8427->bus);
		data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
		snd_i2c_unlock(cs8427->bus);
		if (!(data & CS8427_UNLOCK))
			break;
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(1);
	}
	snd_i2c_lock(cs8427->bus);
	chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
	chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
	snd_i2c_unlock(cs8427->bus);
}

static int snd_cs8427_in_status_info(snd_kcontrol_t *kcontrol,
				     snd_ctl_elem_info_t *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 255;
	return 0;
}

static int snd_cs8427_in_status_get(snd_kcontrol_t *kcontrol,
				    snd_ctl_elem_value_t *ucontrol)
{
	snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
	int data;

	snd_i2c_lock(device->bus);
	data = snd_cs8427_reg_read(device, kcontrol->private_value);
	snd_i2c_unlock(device->bus);
	if (data < 0)
		return data;
	ucontrol->value.integer.value[0] = data;
	return 0;
}

static int snd_cs8427_qsubcode_info(snd_kcontrol_t *kcontrol,
				    snd_ctl_elem_info_t *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
	uinfo->count = 10;
	return 0;
}

static int snd_cs8427_qsubcode_get(snd_kcontrol_t *kcontrol,
				   snd_ctl_elem_value_t *ucontrol)
{
	snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
	unsigned char reg = CS8427_REG_QSUBCODE;
	int err;

	snd_i2c_lock(device->bus);
	if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
		snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
		snd_i2c_unlock(device->bus);
		return err < 0 ? err : -EIO;
	}
	if ((err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10)) != 10) {
		snd_printk("unable to read Q-subcode bytes from CS8427\n");
		snd_i2c_unlock(device->bus);
		return err < 0 ? err : -EIO;
	}
	snd_i2c_unlock(device->bus);
	return 0;
}

static int snd_cs8427_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
	uinfo->count = 1;
	return 0;
}

static int snd_cs8427_spdif_get(snd_kcontrol_t * kcontrol,
				snd_ctl_elem_value_t * ucontrol)
{
	snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
	cs8427_t *chip = device->private_data;
	
	snd_i2c_lock(device->bus);
	memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
	snd_i2c_unlock(device->bus);
	return 0;
}

static int snd_cs8427_spdif_put(snd_kcontrol_t * kcontrol,
				snd_ctl_elem_value_t * ucontrol)
{
	snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
	cs8427_t *chip = device->private_data;
	unsigned char *status = kcontrol->private_value ? chip->playback.pcm_status : chip->playback.def_status;
	snd_pcm_runtime_t *runtime = chip->playback.substream ? chip->playback.substream->runtime : NULL;
	int err, change;

	snd_i2c_lock(device->bus);
	change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
	memcpy(status, ucontrol->value.iec958.status, 24);
	if (change && (kcontrol->private_value ? runtime != NULL : runtime == NULL)) {
		err = snd_cs8427_send_corudata(device, 0, status, 24);
		if (err < 0)
			change = err;
	}
	snd_i2c_unlock(device->bus);
	return change;
}

static int snd_cs8427_spdif_mask_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
	uinfo->count = 1;
	return 0;
}

static int snd_cs8427_spdif_mask_get(snd_kcontrol_t * kcontrol,
				      snd_ctl_elem_value_t * ucontrol)
{
	memset(ucontrol->value.iec958.status, 0xff, 24);
	return 0;
}

static snd_kcontrol_new_t snd_cs8427_iec958_controls[] = {
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.info =		snd_cs8427_in_status_info,
	.name =		"IEC958 CS8427 Input Status",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.get =		snd_cs8427_in_status_get,
	.private_value = 15,
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.info =		snd_cs8427_in_status_info,
	.name =		"IEC958 CS8427 Error Status",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.get =		snd_cs8427_in_status_get,
	.private_value = 16,
},
{
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
	.info =		snd_cs8427_spdif_mask_info,
	.get =		snd_cs8427_spdif_mask_get,
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
	.info =		snd_cs8427_spdif_info,
	.get =		snd_cs8427_spdif_get,
	.put =		snd_cs8427_spdif_put,
	.private_value = 0
},
{
	.access =	SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
	.info =		snd_cs8427_spdif_info,
	.get =		snd_cs8427_spdif_get,
	.put =		snd_cs8427_spdif_put,
	.private_value = 1
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.info =		snd_cs8427_qsubcode_info,
	.name =		"IEC958 Q-subcode Capture Default",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.get =		snd_cs8427_qsubcode_get
}};

int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427,
			    snd_pcm_substream_t *play_substream,
			    snd_pcm_substream_t *cap_substream)
{
	cs8427_t *chip = cs8427->private_data;
	snd_kcontrol_t *kctl;
	unsigned int idx;
	int err;

	snd_assert(play_substream && cap_substream, return -EINVAL);
	for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
		kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
		if (kctl == NULL)
			return -ENOMEM;
		kctl->id.device = play_substream->pcm->device;
		kctl->id.subdevice = play_substream->number;
		err = snd_ctl_add(cs8427->bus->card, kctl);
		if (err < 0)
			return err;
		if (!strcmp(kctl->id.name, SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
			chip->playback.pcm_ctl = kctl;
	}

	chip->playback.substream = play_substream;
	chip->capture.substream = cap_substream;
	snd_assert(chip->playback.pcm_ctl, return -EIO);
	return 0;
}

int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active)
{
	cs8427_t *chip;

	snd_assert(cs8427, return -ENXIO);
	chip = cs8427->private_data;
	if (active)
		memcpy(chip->playback.pcm_status, chip->playback.def_status, 24);
	chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
	snd_ctl_notify(cs8427->bus->card, SNDRV_CTL_EVENT_MASK_VALUE |
					  SNDRV_CTL_EVENT_MASK_INFO, &chip->playback.pcm_ctl->id);
	return 0;
}

int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate)
{
	cs8427_t *chip;
	char *status;
	int err, reset;

	snd_assert(cs8427, return -ENXIO);
	chip = cs8427->private_data;
	status = chip->playback.pcm_status;
	snd_i2c_lock(cs8427->bus);
	if (status[0] & IEC958_AES0_PROFESSIONAL) {
		status[0] &= ~IEC958_AES0_PRO_FS;
		switch (rate) {
		case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
		case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
		case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
		default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
		}
	} else {
		status[3] &= ~IEC958_AES3_CON_FS;
		switch (rate) {
		case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
		case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
		case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
		}
	}
	err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
	if (err > 0)
		snd_ctl_notify(cs8427->bus->card,
			       SNDRV_CTL_EVENT_MASK_VALUE,
			       &chip->playback.pcm_ctl->id);
	reset = chip->rate != rate;
	chip->rate = rate;
	snd_i2c_unlock(cs8427->bus);
	if (reset)
		snd_cs8427_reset(cs8427);
	return err < 0 ? err : 0;
}

static int __init alsa_cs8427_module_init(void)
{
	return 0;
}

static void __exit alsa_cs8427_module_exit(void)
{
}

module_init(alsa_cs8427_module_init)
module_exit(alsa_cs8427_module_exit)

EXPORT_SYMBOL(snd_cs8427_create);
EXPORT_SYMBOL(snd_cs8427_reset);
EXPORT_SYMBOL(snd_cs8427_reg_write);
EXPORT_SYMBOL(snd_cs8427_iec958_build);
EXPORT_SYMBOL(snd_cs8427_iec958_active);
EXPORT_SYMBOL(snd_cs8427_iec958_pcm);