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>

3 files changed, 42 insertions, 22 deletions

diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c
index 3a1977f41e27..7dd506b987fe 100644
--- a/drivers/media/video/cx88/cx88-tvaudio.c
+++ b/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) {
diff --git a/drivers/media/video/cx88/cx88-video.c b/drivers/media/video/cx88/cx88-video.c
index be45955dff68..3904b73f52ee 100644
--- a/drivers/media/video/cx88/cx88-video.c
+++ b/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();
diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h
index 100ffc4b5d90..76207c2856b7 100644
--- a/drivers/media/video/cx88/cx88.h
+++ b/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);