ALSA: revo51: add headphone output

It is ALSA bug #1754.
 D6 bit in 02 register is PW4.

Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/i2c/other/ak4xxx-adda.c

diff --git a/sound/i2c/other/ak4xxx-adda.c b/sound/i2c/other/ak4xxx-adda.c
index 288926d..ee47aba 100644
--- a/sound/i2c/other/ak4xxx-adda.c
+++ b/sound/i2c/other/ak4xxx-adda.c
@@ -233,8 +233,8 @@
 		0x01, 0x02, /* 1: reset and soft-mute */
 		0x00, 0x06, /* 0: mode3(i2s), disable auto-clock detect,
 			     * disable DZF, sharp roll-off, RSTN#=0 */
-		0x02, 0x0e, /* 2: DA's power up, normal speed, RSTN#=0 */
-		// 0x02, 0x2e, /* quad speed */
+		0x02, 0x4e, /* 2: DA's power up, normal speed, RSTN#=0 */
+		/* 0x02, 0x6e,*/ /* quad speed */
 		0x03, 0x01, /* 3: de-emphasis off */
 		0x04, 0x00, /* 4: LOUT1 volume muted */
 		0x05, 0x00, /* 5: ROUT1 volume muted */

sound/pci/ice1712/revo.c

diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
index 5e1b156..d219391 100644
--- a/sound/pci/ice1712/revo.c
+++ b/sound/pci/ice1712/revo.c
@@ -216,6 +216,7 @@
 	AK_DAC("PCM Center Playback Volume", 1),
 	AK_DAC("PCM LFE Playback Volume", 1),
 	AK_DAC("PCM Rear Playback Volume", 2),
+	AK_DAC("PCM Headphone Volume", 2),
 };
 
 static const char *revo51_adc_input_names[] = {
@@ -279,7 +280,7 @@
 
 static struct snd_akm4xxx akm_revo51 __devinitdata = {
 	.type = SND_AK4358,
-	.num_dacs = 6,
+	.num_dacs = 8,
 	.ops = {
 		.set_rate_val = revo_set_rate_val
 	},
@@ -508,7 +509,7 @@
 		ice->gpio.i2s_mclk_changed = revo_i2s_mclk_changed;
 		break;
 	case VT1724_SUBDEVICE_REVOLUTION51:
-		ice->num_total_dacs = 6;
+		ice->num_total_dacs = 8;
 		ice->num_total_adcs = 2;
 		break;
 	case VT1724_SUBDEVICE_AUDIOPHILE192: