V4L/DVB (9269): cx88: add I2S-ADC tvaudio method

This adds I2S-ADC tvaudio mode as a formal method of audio
delivery.

This fixes one bug and adds fm audio via I2S-ADC on cards
that support it.

The bug occured before when I2S-ADC mode was initiated on
composite/s-video open but was then reset within 500ms
by the audio thread which used any previous audio tuning
details.
Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

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

@@ -767,6 +767,14 @@ void cx88_set_tvaudio(struct cx88_core *core)
 	case WW_FM:
 		set_audio_standard_FM(core, radio_deemphasis);
 		break;
+	case WW_I2SADC:
+		set_audio_start(core, 0x01);
+		/* Slave/Philips/Autobaud */
+		cx_write(AUD_I2SINPUTCNTL, 0);
+		/* Switch to "I2S ADC mode" */
+		cx_write(AUD_I2SCNTL, 0x1);
+		set_audio_finish(core, EN_I2SIN_ENABLE);
+		break;
 	case WW_NONE:
 	default:
 		printk("%s/0: unknown tv audio mode [%d]\n",
@@ -895,6 +903,9 @@ void cx88_set_stereo(struct cx88_core *core, u32 mode, int manual)
 			break;
 		}
 		break;
+	case WW_I2SADC:
+		/* DO NOTHING */
+		break;
 	}
 
 	if (UNSET != ctl) {

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

@@ -426,24 +426,7 @@ int cx88_video_mux(struct cx88_core *core, unsigned int input)
 
 	/* if there are audioroutes defined, we have an external
 	   ADC to deal with audio */
-
 	if (INPUT(input).audioroute) {
-
-		/* cx2388's C-ADC is connected to the tuner only.
-		   When used with S-Video, that ADC is busy dealing with
-		   chroma, so an external must be used for baseband audio */
-
-		if (INPUT(input).type != CX88_VMUX_TELEVISION &&
-			INPUT(input).type != CX88_RADIO) {
-			/* "ADC mode" */
-			cx_write(AUD_I2SCNTL, 0x1);
-			cx_set(AUD_CTL, EN_I2SIN_ENABLE);
-		} else {
-			/* Normal mode */
-			cx_write(AUD_I2SCNTL, 0x0);
-			cx_clear(AUD_CTL, EN_I2SIN_ENABLE);
-		}
-
 		/* The wm8775 module has the "2" route hardwired into
 		   the initialization. Some boards may use different
 		   routes for different inputs. HVR-1300 surely does */
@@ -454,9 +437,19 @@ int cx88_video_mux(struct cx88_core *core, unsigned int input)
 			route.input = INPUT(input).audioroute;
 			cx88_call_i2c_clients(core,
 				VIDIOC_INT_S_AUDIO_ROUTING, &route);
-
 		}
-
+		/* cx2388's C-ADC is connected to the tuner only.
+		   When used with S-Video, that ADC is busy dealing with
+		   chroma, so an external must be used for baseband audio */
+		if (INPUT(input).type != CX88_VMUX_TELEVISION ) {
+			/* "I2S ADC mode" */
+			core->tvaudio = WW_I2SADC;
+			cx88_set_tvaudio(core);
+		} else {
+			/* Normal mode */
+			cx_write(AUD_I2SCNTL, 0x0);
+			cx_clear(AUD_CTL, EN_I2SIN_ENABLE);
+		}
 	}
 
 	return 0;
@@ -832,9 +825,24 @@ static int video_open(struct inode *inode, struct file *file)
 		cx_write(MO_GP0_IO, core->board.radio.gpio0);
 		cx_write(MO_GP1_IO, core->board.radio.gpio1);
 		cx_write(MO_GP2_IO, core->board.radio.gpio2);
-		core->tvaudio = WW_FM;
-		cx88_set_tvaudio(core);
-		cx88_set_stereo(core,V4L2_TUNER_MODE_STEREO,1);
+		if (core->board.radio.audioroute) {
+			if(core->board.audio_chip &&
+				core->board.audio_chip == V4L2_IDENT_WM8775) {
+				struct v4l2_routing route;
+
+				route.input = core->board.radio.audioroute;
+				cx88_call_i2c_clients(core,
+					VIDIOC_INT_S_AUDIO_ROUTING, &route);
+			}
+			/* "I2S ADC mode" */
+			core->tvaudio = WW_I2SADC;
+			cx88_set_tvaudio(core);
+		} else {
+			/* FM Mode */
+			core->tvaudio = WW_FM;
+			cx88_set_tvaudio(core);
+			cx88_set_stereo(core,V4L2_TUNER_MODE_STEREO,1);
+		}
 		cx88_call_i2c_clients(core,AUDC_SET_RADIO,NULL);
 	}
 	unlock_kernel();

drivers/media/video/cx88/cx88.h

@@ -630,6 +630,7 @@ extern void cx88_setup_xc3028(struct cx88_core *core, struct xc2028_ctrl *ctl);
 #define WW_EIAJ		 7
 #define WW_I2SPT	 8
 #define WW_FM		 9
+#define WW_I2SADC	 10
 
 void cx88_set_tvaudio(struct cx88_core *core);
 void cx88_newstation(struct cx88_core *core);