V4L/DVB (9653): em28xx: improve AC97 handling

[pandora-kernel.git] / drivers / media / video / em28xx / em28xx-reg.h

diff --git a/drivers/media/video/em28xx/em28xx-reg.h b/drivers/media/video/em28xx/em28xx-reg.h
index 12c9132..9727f38 100644 (file)
--- a/drivers/media/video/em28xx/em28xx-reg.h
+++ b/drivers/media/video/em28xx/em28xx-reg.h
@@ -130,10 +130,13 @@ enum em28xx_chip_id {
 
 /* Standard AC97 registers */
 #define AC97_RESET               0x00
+
+       /* Output volumes */
 #define AC97_MASTER_VOL          0x02
-#define AC97_LINE_LEVEL_VOL      0x04
+#define AC97_LINE_LEVEL_VOL      0x04  /* Some devices use for headphones */
 #define AC97_MASTER_MONO_VOL     0x06
 
+       /* Input volumes */
 #define AC97_PC_BEEP_VOL         0x0a
 #define AC97_PHONE_VOL           0x0c
 #define AC97_MIC_VOL             0x0e
@@ -142,8 +145,12 @@ enum em28xx_chip_id {
 #define AC97_VIDEO_VOL           0x14
 #define AC97_AUX_VOL             0x16
 #define AC97_PCM_OUT_VOL         0x18
+
+       /* capture registers */
 #define AC97_RECORD_SELECT       0x1a
 #define AC97_RECORD_GAIN         0x1c
+
+       /* control registers */
 #define AC97_GENERAL_PURPOSE     0x20
 #define AC97_3D_CTRL             0x22
 #define AC97_AUD_INT_AND_PAG     0x24
@@ -158,10 +165,15 @@ enum em28xx_chip_id {
 #define AC97_PCM_OUT_SURR_SRATE  0x2e
 #define AC97_PCM_OUT_LFE_SRATE   0x30
 #define AC97_PCM_IN_SRATE        0x32
+
+       /* For devices with more than 2 channels, extra output volumes */
 #define AC97_LFE_MASTER_VOL      0x36
 #define AC97_SURR_MASTER_VOL     0x38
+
+       /* Digital SPDIF output control */
 #define AC97_SPDIF_OUT_CTRL      0x3a
 
+       /* Vendor ID identifier */
 #define AC97_VENDOR_ID1          0x7c
 #define AC97_VENDOR_ID2          0x7e