[ALSA] ac97 - Smart 5.1 for VIA 1617a codec

/*

 * VT1617A codec

 */

static int patch_vt1617a(struct snd_ac97 * ac97)

/*

 * unfortunately, the vt1617a stashes the twiddlers required for

 * nooding the i/o jacks on 2 different regs. * thameans that we cant

 * use the easy way provided by AC97_ENUM_DOUBLE() we have to write

 * are own funcs.

 *

 * NB: this is absolutely and utterly different from the vt1618. dunno

 * about the 1616.

 */

/* copied from ac97_surround_jack_mode_info() */

static int snd_ac97_vt1617a_smart51_info(struct snd_kcontrol *kcontrol,

					 struct snd_ctl_elem_info *uinfo)

{

	/* ordering in this list reflects vt1617a docs for Reg 20 and

	 * 7a and Table 6 that lays out the matrix NB WRT Table6: SM51

	 * is SM51EN *AND* it's Bit14, not Bit15 so the table is very

	 * counter-intuitive */ 

	static const char* texts[] = { "LineIn Mic1", "LineIn Mic1 Mic3",

				       "Surr LFE/C Mic3", "LineIn LFE/C Mic3",

				       "LineIn Mic2", "LineIn Mic2 Mic1",

				       "Surr LFE Mic1", "Surr LFE Mic1 Mic2"};

	return ac97_enum_text_info(kcontrol, uinfo, texts, 8);

}

static int snd_ac97_vt1617a_smart51_get(struct snd_kcontrol *kcontrol,

					struct snd_ctl_elem_value *ucontrol)

{

	ushort usSM51, usMS;  

	struct snd_ac97 *pac97;

	pac97 = snd_kcontrol_chip(kcontrol); /* grab codec handle */

	/* grab our desirec bits, then mash them together in a manner

	 * consistent with Table 6 on page 17 in the 1617a docs */

	usSM51 = snd_ac97_read(pac97, 0x7a) >> 14;

	usMS   = snd_ac97_read(pac97, 0x20) >> 8;

	ucontrol->value.enumerated.item[0] = (usSM51 << 1) + usMS;

	return 0;

}

static int snd_ac97_vt1617a_smart51_put(struct snd_kcontrol *kcontrol,

					struct snd_ctl_elem_value *ucontrol)

{

	ushort usSM51, usMS, usReg;  

	struct snd_ac97 *pac97;

	pac97 = snd_kcontrol_chip(kcontrol); /* grab codec handle */

	usSM51 = ucontrol->value.enumerated.item[0] >> 1;

	usMS   = ucontrol->value.enumerated.item[0] &  1;

	/* push our values into the register - consider that things will be left

	 * in a funky state if the write fails */

	usReg = snd_ac97_read(pac97, 0x7a);

	snd_ac97_write_cache(pac97, 0x7a, (usReg & 0x3FFF) + (usSM51 << 14));

	usReg = snd_ac97_read(pac97, 0x20);

	snd_ac97_write_cache(pac97, 0x20, (usReg & 0xFEFF) + (usMS   <<  8));

	return 0;

}

static const struct snd_kcontrol_new snd_ac97_controls_vt1617a[] = {

	AC97_SINGLE("Center/LFE Exchange", 0x5a, 8, 1, 0),

	/*

	 * These are used to enable/disable surround sound on motherboards

	 * that have 3 bidirectional analog jacks

	 */

	{

	/* bring analog power consumption to normal, like WinXP driver

	 * for EPIA SP

		.iface         = SNDRV_CTL_ELEM_IFACE_MIXER,

		.name          = "Smart 5.1 Select",

		.info          = snd_ac97_vt1617a_smart51_info,

		.get           = snd_ac97_vt1617a_smart51_get,

		.put           = snd_ac97_vt1617a_smart51_put,

	},

};

int patch_vt1617a(struct snd_ac97 * ac97)

{

	int err = 0;

	/* we choose to not fail out at this point, but we tell the

	   caller when we return */

	err = patch_build_controls(ac97, &snd_ac97_controls_vt1617a[0],

				   ARRAY_SIZE(snd_ac97_controls_vt1617a));

	/* bring analog power consumption to normal by turning off the

	 * headphone amplifier, like WinXP driver for EPIA SP

	 */

	snd_ac97_write_cache(ac97, 0x5c, 0x20);

	ac97->ext_id |= AC97_EI_SPDIF;	/* force the detection of spdif */

	ac97->rates[AC97_RATES_SPDIF] = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000;

	ac97->build_ops = &patch_vt1616_ops;

	return 0;

	return err;

}

/*