V4L/DVB (6831): Audio routes fix for blackbird boards with the wm8775 ADC

Fix lack of audio on the MPEG-2 stream of wm8775 based blackbirds.

The wm8775 module initializes the audio input at "route 2", which doesn't
hold true for all boards. The HVR-1300, for example, uses route 1 for
tuner audio, and route 2 for baseband. So we must route the audio to the
proper input depending on what video input is being used.
Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx88/cx88-cards.c

@@ -302,22 +302,22 @@ static const struct cx88_board cx88_boards[] = {
 			.type   = CX88_VMUX_TELEVISION,
 			.vmux   = 0,
 			.gpio0  = 0x0000bde2,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type   = CX88_VMUX_COMPOSITE1,
 			.vmux   = 1,
 			.gpio0  = 0x0000bde6,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type   = CX88_VMUX_SVIDEO,
 			.vmux   = 2,
 			.gpio0  = 0x0000bde6,
-			.extadc = 1,
+			.audioroute = 1,
 		}},
 		.radio = {
 			.type   = CX88_RADIO,
 			.gpio0  = 0x0000bd62,
-			.extadc = 1,
+			.audioroute = 1,
 		},
 		.mpeg           = CX88_MPEG_BLACKBIRD,
 	},
@@ -378,7 +378,7 @@ static const struct cx88_board cx88_boards[] = {
 			.type   = CX88_VMUX_SVIDEO,
 			.vmux   = 2,
 			.gpio0  = 0x0000fde6, // 0x0000fda6 L,R RCA audio in?
-			.extadc = 1,
+			.audioroute = 1,
 		}},
 		.radio = {
 			.type   = CX88_RADIO,
@@ -549,7 +549,7 @@ static const struct cx88_board cx88_boards[] = {
 		.input          = {{
 			.type   = CX88_VMUX_TELEVISION,
 			.vmux   = 0,
-			.extadc = 1,
+			.audioroute = 1,
 		}},
 		.mpeg           = CX88_MPEG_BLACKBIRD,
 	},
@@ -672,22 +672,22 @@ static const struct cx88_board cx88_boards[] = {
 			.type   = CX88_VMUX_TELEVISION,
 			.vmux   = 0,
 			.gpio0  = 0x00009d80,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type   = CX88_VMUX_COMPOSITE1,
 			.vmux   = 1,
 			.gpio0  = 0x00009d76,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type   = CX88_VMUX_SVIDEO,
 			.vmux   = 2,
 			.gpio0  = 0x00009d76,
-			.extadc = 1,
+			.audioroute = 1,
 		}},
 		.radio = {
 			.type   = CX88_RADIO,
 			.gpio0  = 0x00009d00,
-			.extadc = 1,
+			.audioroute = 1,
 		},
 		.mpeg           = CX88_MPEG_BLACKBIRD,
 	},
@@ -826,23 +826,23 @@ static const struct cx88_board cx88_boards[] = {
 			.type   = CX88_VMUX_COMPOSITE1,
 			.vmux   = 0,
 			.gpio0  = 0x0000cd73,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type   = CX88_VMUX_SVIDEO,
 			.vmux   = 1,
 			.gpio0  = 0x0000cd73,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type   = CX88_VMUX_TELEVISION,
 			.vmux   = 3,
 			.gpio0  = 0x0000cdb3,
-			.extadc = 1,
+			.audioroute = 1,
 		}},
 		.radio = {
 			.type   = CX88_RADIO,
 			.vmux   = 2,
 			.gpio0  = 0x0000cdf3,
-			.extadc = 1,
+			.audioroute = 1,
 		},
 		.mpeg           = CX88_MPEG_BLACKBIRD,
 	},
@@ -1110,12 +1110,12 @@ static const struct cx88_board cx88_boards[] = {
 			.type   = CX88_VMUX_COMPOSITE1,
 			.vmux   = 1,
 			.gpio0  = 0x3de6,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type   = CX88_VMUX_SVIDEO,
 			.vmux   = 2,
 			.gpio0  = 0x3de6,
-			.extadc = 1,
+			.audioroute = 1,
 		}},
 		.radio = {
 			.type   = CX88_RADIO,
@@ -1340,17 +1340,17 @@ static const struct cx88_board cx88_boards[] = {
 			.type   = CX88_VMUX_TELEVISION,
 			.vmux   = 0,
 			.gpio0	= 0xe780,
-			.extadc = 1,
+			.audioroute = 1,
 		},{
 			.type	= CX88_VMUX_COMPOSITE1,
 			.vmux	= 1,
 			.gpio0	= 0xe780,
-			.extadc = 1,
+			.audioroute = 2,
 		},{
 			.type	= CX88_VMUX_SVIDEO,
 			.vmux	= 2,
 			.gpio0	= 0xe780,
-			.extadc = 1,
+			.audioroute = 2,
 		}},
 		/* fixme: Add radio support */
 		.mpeg           = CX88_MPEG_DVB | CX88_MPEG_BLACKBIRD,

drivers/media/video/cx88/cx88-video.c

@@ -394,9 +394,21 @@ int cx88_video_mux(struct cx88_core *core, unsigned int input)
 
 	if (core->board.mpeg & CX88_MPEG_BLACKBIRD) {
 		/* sets sound input from external adc */
-		if (INPUT(input).extadc)
+		if (INPUT(input).audioroute) {
+			/* The wm8775 module has the "2" route hardwired into
+			   the initialization. Some boards may use different
+			   routes for different inputs. HVR-1300 surely does */
+			if (core->board.audio_chip &&
+			    core->board.audio_chip == AUDIO_CHIP_WM8775) {
+				struct v4l2_routing route;
+
+				route.input = INPUT(input).audioroute;
+				cx88_call_i2c_clients(core,
+					VIDIOC_INT_S_AUDIO_ROUTING,&route);
+			}
+
 			cx_set(AUD_CTL, EN_I2SIN_ENABLE);
-		else
+		} else
 			cx_clear(AUD_CTL, EN_I2SIN_ENABLE);
 	}
 	return 0;

drivers/media/video/cx88/cx88.h

@@ -228,7 +228,7 @@ struct cx88_input {
 	enum cx88_itype type;
 	u32             gpio0, gpio1, gpio2, gpio3;
 	unsigned int    vmux:2;
-	unsigned int    extadc:1;
+	unsigned int    audioroute;
 };
 
 struct cx88_board {