[ALSA] ac97 - fix various issues with AD1986/AD1986A support

Previously, ac97_codec.c was coded to support AD1986 and AD1986A
CODECs using code written for the AD1985 CODEC.  This allowed the
LINE_OUT and HEADPHONE jacks to function properly, however register
differences between the CODECs prevented line and microphone inputs
from functioning.
Specifically, this patch fixes issues with the following mixer
controls:  'V_REFOUT', 'Spread Front to Surround and Center/LFE',
'Exchange Front/Surround', 'Surround Jack Mode', and 'Channel Mode'.
This patch removes the undocumented AD1888 control
'High Pass Filter Enable' and adds the new control
'Exchange Mic/Line In'.

Signed-off-by: Randy Cushman <rcushman_linux@earthlink.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

include/sound/ac97_codec.h

@@ -503,6 +503,7 @@ struct snd_ac97 {
 			unsigned short id[3];		// codec IDs (lower 16-bit word)
 			unsigned short pcmreg[3];	// PCM registers
 			unsigned short codec_cfg[3];	// CODEC_CFG bits
+			unsigned char swap_mic_linein;	// AD1986/AD1986A only
 		} ad18xx;
 		unsigned int dev_flags;		/* device specific */
 	} spec;

sound/pci/ac97/ac97_codec.c

@@ -111,7 +111,7 @@ static const struct ac97_codec_id snd_ac97_codec_ids[] = {
 { 0x41445372, 0xffffffff, "AD1981A",		patch_ad1981a,	NULL },
 { 0x41445374, 0xffffffff, "AD1981B",		patch_ad1981b,	NULL },
 { 0x41445375, 0xffffffff, "AD1985",		patch_ad1985,	NULL },
-{ 0x41445378, 0xffffffff, "AD1986",		patch_ad1985,	NULL },
+{ 0x41445378, 0xffffffff, "AD1986",		patch_ad1986,	NULL },
 { 0x414c4300, 0xffffff00, "ALC100,100P", 	NULL,		NULL },
 { 0x414c4710, 0xfffffff0, "ALC200,200P",	NULL,		NULL },
 { 0x414c4721, 0xffffffff, "ALC650D",		NULL,	NULL }, /* already patched */