path: root/sound/aoa/codecs/snd-aoa-codec-onyx.c

/*
 * Apple Onboard Audio driver for Onyx codec
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * 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 <johannes@sipsolutions.net>");
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(