---

yaml --- r: 124204 b: refs/heads/master c: 5c2231c h: refs/heads/master v: v3
git-mirror · Dec 29, 2008 · f122d44 · f122d44
1 parent 80e7c5d
commit f122d44
Show file tree

Hide file tree

Showing 4 changed files with 53 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 67c96f67060abfe595974a77aeb4ce7815893648
+refs/heads/master: 5c2231c84304563fd5d28e8bbb72e09e882a8e32
diff --git a/trunk/drivers/media/video/em28xx/em28xx-reg.h b/trunk/drivers/media/video/em28xx/em28xx-reg.h
@@ -17,6 +17,16 @@
 
 /* em28xx registers */
 
+#define EM28XX_R00_CHIPCFG	0x00
+
+/* em28xx Chip Configuration 0x00 */
+#define EM28XX_CHIPCFG_VENDOR_AUDIO		0x80
+#define EM28XX_CHIPCFG_I2S_VOLUME_CAPABLE	0x40
+#define EM28XX_CHIPCFG_I2S_3_SAMPRATES		0x30
+#define EM28XX_CHIPCFG_I2S_5_SAMPRATES		0x20
+#define EM28XX_CHIPCFG_AC97			0x10
+#define EM28XX_CHIPCFG_AUDIOMASK		0x30
+
 	/* GPIO/GPO registers */
 #define EM2880_R04_GPO	0x04    /* em2880-em2883 only */
 #define EM28XX_R08_GPIO	0x08	/* em2820 or upper */

diff --git a/trunk/drivers/media/video/em28xx/em28xx-video.c b/trunk/drivers/media/video/em28xx/em28xx-video.c
@@ -1933,16 +1933,49 @@ static struct video_device *em28xx_vdev_init(struct em28xx *dev,
 
 int em28xx_supports_audio_extension(struct em28xx *dev)
 {
+	int rc;
+
 	/* The chip dictates whether we support the Empia analog audio
 	   extension */
 	switch (dev->chip_id) {
 	case CHIP_ID_EM2874:
-		/* Either a digital-only device or provides AC97 audio */
+		/* Digital only device - no analog support */
+		dev->audio_mode = EM28XX_NO_AUDIO;
 		return 0;
+	case CHIP_ID_EM2860:
 	case CHIP_ID_EM2883:
 	default:
+		/* See how this device is configured */
+		rc = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
+		if (rc & EM28XX_CHIPCFG_VENDOR_AUDIO) {
+			switch(rc & EM28XX_CHIPCFG_AUDIOMASK) {
+			case EM28XX_CHIPCFG_AC97:
+				em28xx_info("AC97 audio (5 sample rates)\n");
+				dev->audio_mode = EM28XX_AC97;
+				break;
+			case EM28XX_CHIPCFG_I2S_3_SAMPRATES:
+				em28xx_info("I2S Audio (3 sample rates)\n");
+				dev->audio_mode = EM28XX_I2S_3_SAMPLE_RATES;
+				break;
+			case EM28XX_CHIPCFG_I2S_5_SAMPRATES:
+				em28xx_info("I2S Audio (5 sample rates)\n");
+				dev->audio_mode = EM28XX_I2S_5_SAMPLE_RATES;
+				break;
+			default:
+				em28xx_info("No audio support detected\n");
+				dev->audio_mode = EM28XX_NO_AUDIO;
+				return 0;
+			}
+		} else {
+			em28xx_info("USB Audio class device\n");
+			return 0;
+		}
+		/* The em28xx audio extension needs to be loaded */
 		return 1;
 	}
+
+	/* We should never reach this point */
+	return 0;
 }
 
 static int register_analog_devices(struct em28xx *dev)

diff --git a/trunk/drivers/media/video/em28xx/em28xx.h b/trunk/drivers/media/video/em28xx/em28xx.h
@@ -256,6 +256,13 @@ enum enum28xx_itype {
 	EM28XX_RADIO,
 };
 
+enum em28xx_audio_mode {
+	EM28XX_NO_AUDIO,
+	EM28XX_I2S_3_SAMPLE_RATES,
+	EM28XX_I2S_5_SAMPLE_RATES,
+	EM28XX_AC97,
+};
+
 enum em28xx_amux {
 	EM28XX_AMUX_VIDEO,
 	EM28XX_AMUX_LINE_IN,
@@ -403,6 +410,7 @@ struct em28xx {
 	u32 i2s_speed;		/* I2S speed for audio digital stream */
 
 	enum em28xx_decoder decoder;
+	enum em28xx_audio_mode audio_mode;
 
 	int tuner_type;		/* type of the tuner */
 	int tuner_addr;		/* tuner address */