snd-aoa-codec-onyx.c

linux 内核源代码

/*
 * Apple Onboard Audio driver for Onyx codec
 *
 * Copyright 2006 Johannes Berg <[e-mail]>
 *
 * GPL v2, can be found in COPYING.
 *
 *
 * This is a driver for the pcm3052 codec chip (codenamed Onyx)
 * that is present in newer Apple hardware (with digital output).
 *
 * The Onyx codec has the following connections (listed by the bit
 * to be used in aoa_codec.connected):
 *  0: analog output
 *  1: digital output
 *  2: line input
 *  3: microphone input
 * Note that even though I know of no machine that has for example
 * the digital output connected but not the analog, I have handled
 * all the different cases in the code so that this driver may serve
 * as a good example of what to do.
 *
 * NOTE: This driver assumes that there's at most one chip to be
 * 	 used with one alsa card, in form of creating all kinds
 *	 of mixer elements without regard for their existence.
 *	 But snd-aoa assumes that there's at most one card, so
 *	 this means you can only have one onyx on a system. This
 *	 should probably be fixed by changing the assumption of
 *	 having just a single card on a system, and making the
 *	 'card' pointer accessible to anyone who needs it instead
 *	 of hiding it in the aoa_snd_* functions...
 *
 */
#include <linux/delay.h>
#include <linux/module.h>
MODULE_AUTHOR("Johannes Berg <[e-mail]>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("pcm3052 (onyx) codec driver for snd-aoa");

#include "snd-aoa-codec-onyx.h"
#include "../aoa.h"
#include "../soundbus/soundbus.h"


#define PFX "snd-aoa-codec-onyx: "

struct onyx {
	/* cache registers 65 to 80, they are write-only! */
	u8			cache[16];
	struct i2c_client	i2c;
	struct aoa_codec	codec;
	u32			initialised:1,
				spdif_locked:1,
				analog_locked:1,
				original_mute:2;
	int			open_count;
	struct codec_info	*codec_info;

	/* mutex serializes concurrent access to the device
	 * and this structure.
	 */
	struct mutex mutex;
};
#define codec_to_onyx(c) container_of(c, struct onyx, codec)

/* both return 0 if all ok, else on error */
static int onyx_read_register(struct onyx *onyx, u8 reg, u8 *value)
{
	s32 v;

	if (reg != ONYX_REG_CONTROL) {
		*value = onyx->cache[reg-FIRSTREGISTER];
		return 0;
	}
	v = i2c_smbus_read_byte_data(&onyx->i2c, reg);
	if (v < 0)
		return -1;
	*value = (u8)v;
	onyx->cache[ONYX_REG_CONTROL-FIRSTREGISTER] = *value;
	return 0;
}

static int onyx_write_register(struct onyx *onyx, u8 reg, u8 value)
{
	int result;

	result = i2c_smbus_write_byte_data(&onyx->i2c, reg, value);
	if (!result)
		onyx->cache[reg-FIRSTREGISTER] = value;
	return result;
}

/* alsa stuff */

static int onyx_dev_register(struct snd_device *dev)
{
	return 0;
}

static struct snd_device_ops ops = {
	.dev_register = onyx_dev_register,
};

/* this is necessary because most alsa mixer programs
 * can't properly handle the negative range */
#define VOLUME_RANGE_SHIFT	128

static int onyx_snd_vol_info(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = -128 + VOLUME_RANGE_SHIFT;
	uinfo->value.integer.max = -1 + VOLUME_RANGE_SHIFT;
	return 0;
}

static int onyx_snd_vol_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	s8 l, r;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_LEFT, &l);
	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT, &r);
	mutex_unlock(&onyx->mutex);

	ucontrol->value.integer.value[0] = l + VOLUME_RANGE_SHIFT;
	ucontrol->value.integer.value[1] = r + VOLUME_RANGE_SHIFT;

	return 0;
}

static int onyx_snd_vol_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	s8 l, r;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_LEFT, &l);
	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT, &r);

	if (l + VOLUME_RANGE_SHIFT == ucontrol->value.integer.value[0] &&
	    r + VOLUME_RANGE_SHIFT == ucontrol->value.integer.value[1]) {
		mutex_unlock(&onyx->mutex);
		return 0;
	}

	onyx_write_register(onyx, ONYX_REG_DAC_ATTEN_LEFT,
			    ucontrol->value.integer.value[0]
			     - VOLUME_RANGE_SHIFT);
	onyx_write_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT,
			    ucontrol->value.integer.value[1]
			     - VOLUME_RANGE_SHIFT);
	mutex_unlock(&onyx->mutex);

	return 1;
}

static struct snd_kcontrol_new volume_control = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Master Playback Volume",
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.info = onyx_snd_vol_info,
	.get = onyx_snd_vol_get,
	.put = onyx_snd_vol_put,
};

/* like above, this is necessary because a lot
 * of alsa mixer programs don't handle ranges
 * that don't start at 0 properly.
 * even alsamixer is one of them... */
#define INPUTGAIN_RANGE_SHIFT	(-3)

static int onyx_snd_inputgain_info(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 3 + INPUTGAIN_RANGE_SHIFT;
	uinfo->value.integer.max = 28 + INPUTGAIN_RANGE_SHIFT;
	return 0;
}

static int onyx_snd_inputgain_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 ig;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &ig);
	mutex_unlock(&onyx->mutex);

	ucontrol->value.integer.value[0] =
		(ig & ONYX_ADC_PGA_GAIN_MASK) + INPUTGAIN_RANGE_SHIFT;

	return 0;
}

static int onyx_snd_inputgain_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 v, n;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
	n = v;
	n &= ~ONYX_ADC_PGA_GAIN_MASK;
	n |= (ucontrol->value.integer.value[0] - INPUTGAIN_RANGE_SHIFT)
		& ONYX_ADC_PGA_GAIN_MASK;
	onyx_write_register(onyx, ONYX_REG_ADC_CONTROL, n);
	mutex_unlock(&onyx->mutex);

	return n != v;
}

static struct snd_kcontrol_new inputgain_control = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Master Capture Volume",
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.info = onyx_snd_inputgain_info,
	.get = onyx_snd_inputgain_get,
	.put = onyx_snd_inputgain_put,
};

static int onyx_snd_capture_source_info(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo)
{
	static char *texts[] = { "Line-In", "Microphone" };

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

static int onyx_snd_capture_source_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	s8 v;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
	mutex_unlock(&onyx->mutex);

	ucontrol->value.enumerated.item[0] = !!(v&ONYX_ADC_INPUT_MIC);

	return 0;
}

static void onyx_set_capture_source(struct onyx *onyx, int mic)
{
	s8 v;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
	v &= ~ONYX_ADC_INPUT_MIC;
	if (mic)
		v |= ONYX_ADC_INPUT_MIC;
	onyx_write_register(onyx, ONYX_REG_ADC_CONTROL, v);
	mutex_unlock(&onyx->mutex);
}

static int onyx_snd_capture_source_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	onyx_set_capture_source(snd_kcontrol_chip(kcontrol),
				ucontrol->value.enumerated.item[0]);
	return 1;
}

static struct snd_kcontrol_new capture_source_control = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	/* If we name this 'Input Source', it properly shows up in
	 * alsamixer as a selection, * but it's shown under the 
	 * 'Playback' category.
	 * If I name it 'Capture Source', it shows up in strange
	 * ways (two bools of which one can be selected at a
	 * time) but at least it's shown in the 'Capture'
	 * category.
	 * I was told that this was due to backward compatibility,
	 * but I don't understand then why the mangling is *not*
	 * done when I name it "Input Source".....
	 */
	.name = "Capture Source",
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.info = onyx_snd_capture_source_info,
	.get = onyx_snd_capture_source_get,
	.put = onyx_snd_capture_source_put,
};

#define onyx_snd_mute_info	snd_ctl_boolean_stereo_info

static int onyx_snd_mute_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 c;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &c);
	mutex_unlock(&onyx->mutex);

	ucontrol->value.integer.value[0] = !(c & ONYX_MUTE_LEFT);
	ucontrol->value.integer.value[1] = !(c & ONYX_MUTE_RIGHT);

	return 0;
}

static int onyx_snd_mute_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 v = 0, c = 0;
	int err = -EBUSY;

	mutex_lock(&onyx->mutex);
	if (onyx->analog_locked)
		goto out_unlock;

	onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &v);
	c = v;
	c &= ~(ONYX_MUTE_RIGHT | ONYX_MUTE_LEFT);
	if (!ucontrol->value.integer.value[0])
		c |= ONYX_MUTE_LEFT;
	if (!ucontrol->value.integer.value[1])
		c |= ONYX_MUTE_RIGHT;
	err = onyx_write_register(onyx, ONYX_REG_DAC_CONTROL, c);

 out_unlock:
	mutex_unlock(&onyx->mutex);

	return !err ? (v != c) : err;
}

static struct snd_kcontrol_new mute_control = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Master Playback Switch",
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.info = onyx_snd_mute_info,
	.get = onyx_snd_mute_get,
	.put = onyx_snd_mute_put,
};


#define onyx_snd_single_bit_info	snd_ctl_boolean_mono_info

#define FLAG_POLARITY_INVERT	1
#define FLAG_SPDIFLOCK		2

static int onyx_snd_single_bit_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 c;
	long int pv = kcontrol->private_value;
	u8 polarity = (pv >> 16) & FLAG_POLARITY_INVERT;
	u8 address = (pv >> 8) & 0xff;
	u8 mask = pv & 0xff;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, address, &c);
	mutex_unlock(&onyx->mutex);

	ucontrol->value.integer.value[0] = !!(c & mask) ^ polarity;

	return 0;
}

static int onyx_snd_single_bit_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 v = 0, c = 0;
	int err;
	long int pv = kcontrol->private_value;
	u8 polarity = (pv >> 16) & FLAG_POLARITY_INVERT;
	u8 spdiflock = (pv >> 16) & FLAG_SPDIFLOCK;
	u8 address = (pv >> 8) & 0xff;
	u8 mask = pv & 0xff;

	mutex_lock(&onyx->mutex);
	if (spdiflock && onyx->spdif_locked) {
		/* even if alsamixer doesn't care.. */
		err = -EBUSY;
		goto out_unlock;
	}
	onyx_read_register(onyx, address, &v);
	c = v;
	c &= ~(mask);
	if (!!ucontrol->value.integer.value[0] ^ polarity)
		c |= mask;
	err = onyx_write_register(onyx, address, c);

 out_unlock:
	mutex_unlock(&onyx->mutex);

	return !err ? (v != c) : err;
}

#define SINGLE_BIT(n, type, description, address, mask, flags)	 	\
static struct snd_kcontrol_new n##_control = {				\
	.iface = SNDRV_CTL_ELEM_IFACE_##type,				\
	.name = description,						\
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,			\
	.info = onyx_snd_single_bit_info,				\
	.get = onyx_snd_single_bit_get,					\
	.put = onyx_snd_single_bit_put,					\
	.private_value = (flags << 16) | (address << 8) | mask		\
}

SINGLE_BIT(spdif,
	   MIXER,
	   SNDRV_CTL_NAME_IEC958("", PLAYBACK, SWITCH),
	   ONYX_REG_DIG_INFO4,
	   ONYX_SPDIF_ENABLE,
	   FLAG_SPDIFLOCK);
SINGLE_BIT(ovr1,
	   MIXER,
	   "Oversampling Rate",
	   ONYX_REG_DAC_CONTROL,
	   ONYX_OVR1,
	   0);
SINGLE_BIT(flt0,
	   MIXER,
	   "Fast Digital Filter Rolloff",
	   ONYX_REG_DAC_FILTER,
	   ONYX_ROLLOFF_FAST,
	   FLAG_POLARITY_INVERT);
SINGLE_BIT(hpf,
	   MIXER,
	   "Highpass Filter",
	   ONYX_REG_ADC_HPF_BYPASS,
	   ONYX_HPF_DISABLE,
	   FLAG_POLARITY_INVERT);
SINGLE_BIT(dm12,
	   MIXER,
	   "Digital De-Emphasis",
	   ONYX_REG_DAC_DEEMPH,
	   ONYX_DIGDEEMPH_CTRL,
	   0);

static int onyx_spdif_info(struct snd_kcontrol *kcontrol,
			   struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
	uinfo->count = 1;
	return 0;
}

static int onyx_spdif_mask_get(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
{
	/* datasheet page 30, all others are 0 */
	ucontrol->value.iec958.status[0] = 0x3e;
	ucontrol->value.iec958.status[1] = 0xff;

	ucontrol->value.iec958.status[3] = 0x3f;
	ucontrol->value.iec958.status[4] = 0x0f;
	
	return 0;
}

static struct snd_kcontrol_new onyx_spdif_mask = {
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,CON_MASK),
	.info =		onyx_spdif_info,
	.get =		onyx_spdif_mask_get,
};

static int onyx_spdif_get(struct snd_kcontrol *kcontrol,
			  struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 v;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_DIG_INFO1, &v);
	ucontrol->value.iec958.status[0] = v & 0x3e;

	onyx_read_register(onyx, ONYX_REG_DIG_INFO2, &v);
	ucontrol->value.iec958.status[1] = v;

	onyx_read_register(onyx, ONYX_REG_DIG_INFO3, &v);
	ucontrol->value.iec958.status[3] = v & 0x3f;

	onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
	ucontrol->value.iec958.status[4] = v & 0x0f;
	mutex_unlock(&onyx->mutex);

	return 0;
}

static int onyx_spdif_put(struct snd_kcontrol *kcontrol,
			  struct snd_ctl_elem_value *ucontrol)
{
	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
	u8 v;

	mutex_lock(&onyx->mutex);
	onyx_read_register(onyx, ONYX_REG_DIG_INFO1, &v);
	v = (v & ~0x3e) | (ucontrol->value.iec958.status[0] & 0x3e);
	onyx_write_register(onyx, ONYX_REG_DIG_INFO1, v);

	v = ucontrol->value.iec958.status[1];
	onyx_write_register(onyx, ONYX_REG_DIG_INFO2, v);

	onyx_read_register(onyx, ONYX_REG_DIG_INFO3, &v);
	v = (v & ~0x3f) | (ucontrol->value.iec958.status[3] & 0x3f);
	onyx_write_register(onyx, ONYX_REG_DIG_INFO3, v);

	onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
	v = (v & ~0x0f) | (ucontrol->value.iec958.status[4] & 0x0f);
	onyx_write_register(onyx, ONYX_REG_DIG_INFO4, v);
	mutex_unlock(&onyx->mutex);

	return 1;
}

static struct snd_kcontrol_new onyx_spdif_ctrl = {
	.access =	SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
	.info =		onyx_spdif_info,
	.get =		onyx_spdif_get,
	.put =		onyx_spdif_put,
};

/* our registers */

static u8 register_map[] = {
	ONYX_REG_DAC_ATTEN_LEFT,
	ONYX_REG_DAC_ATTEN_RIGHT,
	ONYX_REG_CONTROL,
	ONYX_REG_DAC_CONTROL,
	ONYX_REG_DAC_DEEMPH,
	ONYX_REG_DAC_FILTER,
	ONYX_REG_DAC_OUTPHASE,
	ONYX_REG_ADC_CONTROL,
	ONYX_REG_ADC_HPF_BYPASS,
	ONYX_REG_DIG_INFO1,
	ONYX_REG_DIG_INFO2,
	ONYX_REG_DIG_INFO3,
	ONYX_REG_DIG_INFO4
};