V4L/DVB (6698): pvrusb2: Implement signal routing schemes

The exact routing of video and audio signals within a device is a
device-specific attribute.  Hauppauge devices do it one way; other
types of device may route things differently.  Unfortunately it is
rather impractical to define chip-specific routing at the device
attribute level, so instead what happens here is that "schemes" are
defined.  Each chip level interface implements its part of a given
scheme and the scheme as a whole is made into a device specific
attribute controlled via a table entry in pvrusb2-devattr.c.  The only
scheme defined here is for Hauppauge devices, but clearly this opens
the door for other possibilities to follow.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

5 files changed, 140 insertions, 53 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-audio.c b/drivers/media/video/pvrusb2/pvrusb2-audio.c
index 379645e481c6..9a7c8e9c3e8b 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-audio.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-audio.c
@@ -35,34 +35,58 @@ struct pvr2_msp3400_handler {
 };
 
 
+
+struct routing_scheme {
+        const int *def;
+        unsigned int cnt;
+};
+
+static const int routing_scheme0[] = {
+        [PVR2_CVAL_INPUT_TV]        = MSP_INPUT_DEFAULT,
+        [PVR2_CVAL_INPUT_RADIO]     = MSP_INPUT(MSP_IN_SCART2,
+                                                MSP_IN_TUNER1,
+                                                MSP_DSP_IN_SCART,
+                                                MSP_DSP_IN_SCART),
+        [PVR2_CVAL_INPUT_COMPOSITE] = MSP_INPUT(MSP_IN_SCART1,
+                                                MSP_IN_TUNER1,
+                                                MSP_DSP_IN_SCART,
+                                                MSP_DSP_IN_SCART),
+        [PVR2_CVAL_INPUT_SVIDEO]    = MSP_INPUT(MSP_IN_SCART1,
+                                                MSP_IN_TUNER1,
+                                                MSP_DSP_IN_SCART,
+                                                MSP_DSP_IN_SCART),
+};
+
+static const struct routing_scheme routing_schemes[] = {
+        [PVR2_ROUTING_SCHEME_HAUPPAUGE] = {
+                .def = routing_scheme0,
+                .cnt = ARRAY_SIZE(routing_scheme0),
+        },
+};
+
 /* This function selects the correct audio input source */
 static void set_stereo(struct pvr2_msp3400_handler *ctxt)
 {
         struct pvr2_hdw *hdw = ctxt->hdw;
         struct v4l2_routing route;
+        const struct routing_scheme *sp;
+        unsigned int sid = hdw->hdw_desc->signal_routing_scheme;
 
         pvr2_trace(PVR2_TRACE_CHIPS,"i2c msp3400 v4l2 set_stereo");
 
-        route.input = MSP_INPUT_DEFAULT;
-        route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
-        switch (hdw->input_val) {
-        case PVR2_CVAL_INPUT_TV:
-                break;
-        case PVR2_CVAL_INPUT_RADIO:
-                /* Assume that msp34xx also handle FM decoding, in which case
-                   we're still using the tuner. */
-                /* HV: actually it is more likely to be the SCART2 input if
-                   the ivtv experience is any indication. */
-                route.input = MSP_INPUT(MSP_IN_SCART2, MSP_IN_TUNER1,
-                                    MSP_DSP_IN_SCART, MSP_DSP_IN_SCART);
-                break;
-        case PVR2_CVAL_INPUT_SVIDEO:
-        case PVR2_CVAL_INPUT_COMPOSITE:
-                /* SCART 1 input */
-                route.input = MSP_INPUT(MSP_IN_SCART1, MSP_IN_TUNER1,
-                                    MSP_DSP_IN_SCART, MSP_DSP_IN_SCART);
-                break;
+        if ((sid < ARRAY_SIZE(routing_schemes)) &&
+            ((sp = routing_schemes + sid) != 0) &&
+            (hdw->input_val >= 0) &&
+            (hdw->input_val < sp->cnt)) {
+                route.input = sp->def[hdw->input_val];
+        } else {
+                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
+                           "*** WARNING *** i2c msp3400 v4l2 set_stereo:"
+                           " Invalid routing scheme (%u) and/or input (%d)",
+                           sid,hdw->input_val);
+                return;
         }
+        route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
 }
 
diff --git a/drivers/media/video/pvrusb2/pvrusb2-cx2584x-v4l.c b/drivers/media/video/pvrusb2/pvrusb2-cx2584x-v4l.c
index 2cca817e4144..b6714c41ea75 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-cx2584x-v4l.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-cx2584x-v4l.c
@@ -49,34 +49,65 @@ struct pvr2_v4l_cx2584x {
 };
 
 
+struct routing_scheme_item {
+        int vid;
+        int aud;
+};
+
+struct routing_scheme {
+        const struct routing_scheme_item *def;
+        unsigned int cnt;
+};
+
+static const struct routing_scheme_item routing_scheme0[] = {
+        [PVR2_CVAL_INPUT_TV] = {
+                .vid = CX25840_COMPOSITE7,
+                .aud = CX25840_AUDIO8,
+        },
+        [PVR2_CVAL_INPUT_RADIO] = { /* Treat the same as composite */
+                .vid = CX25840_COMPOSITE3,
+                .aud = CX25840_AUDIO_SERIAL,
+        },
+        [PVR2_CVAL_INPUT_COMPOSITE] = {
+                .vid = CX25840_COMPOSITE3,
+                .aud = CX25840_AUDIO_SERIAL,
+        },
+        [PVR2_CVAL_INPUT_SVIDEO] = {
+                .vid = CX25840_SVIDEO1,
+                .aud = CX25840_AUDIO_SERIAL,
+        },
+};
+
+static const struct routing_scheme routing_schemes[] = {
+        [PVR2_ROUTING_SCHEME_HAUPPAUGE] = {
+                .def = routing_scheme0,
+                .cnt = ARRAY_SIZE(routing_scheme0),
+        },
+};
+
 static void set_input(struct pvr2_v4l_cx2584x *ctxt)
 {
         struct pvr2_hdw *hdw = ctxt->hdw;
         struct v4l2_routing route;
         enum cx25840_video_input vid_input;
         enum cx25840_audio_input aud_input;
+        const struct routing_scheme *sp;
+        unsigned int sid = hdw->hdw_desc->signal_routing_scheme;
 
         memset(&route,0,sizeof(route));
 
-        switch(hdw->input_val) {
-        case PVR2_CVAL_INPUT_TV:
-                vid_input = CX25840_COMPOSITE7;
-                aud_input = CX25840_AUDIO8;
-                break;
-        case PVR2_CVAL_INPUT_RADIO: // Treat same as composite
-        case PVR2_CVAL_INPUT_COMPOSITE:
-                vid_input = CX25840_COMPOSITE3;
-                aud_input = CX25840_AUDIO_SERIAL;
-                break;
-        case PVR2_CVAL_INPUT_SVIDEO:
-                vid_input = CX25840_SVIDEO1;
-                aud_input = CX25840_AUDIO_SERIAL;
-                break;
-        default:
-                // Just set it to be composite input for now...
-                vid_input = CX25840_COMPOSITE3;
-                aud_input = CX25840_AUDIO_SERIAL;
-                break;
+        if ((sid < ARRAY_SIZE(routing_schemes)) &&
+            ((sp = routing_schemes + sid) != 0) &&
+            (hdw->input_val >= 0) &&
+            (hdw->input_val < sp->cnt)) {
+                vid_input = sp->def[hdw->input_val].vid;
+                aud_input = sp->def[hdw->input_val].aud;
+        } else {
+                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
+                           "*** WARNING *** i2c cx2584x set_input:"
+                           " Invalid routing scheme (%u) and/or input (%d)",
+                           sid,hdw->input_val);
+                return;
         }
 
         pvr2_trace(PVR2_TRACE_CHIPS,"i2c cx2584x set_input vid=0x%x aud=0x%x",
diff --git a/drivers/media/video/pvrusb2/pvrusb2-devattr.c b/drivers/media/video/pvrusb2/pvrusb2-devattr.c
index 54a401e8bb14..464a13a06494 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-devattr.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-devattr.c
@@ -73,6 +73,7 @@ const struct pvr2_device_desc pvr2_device_descriptions[] = {
                 .fx2_firmware.lst = pvr2_fw1_names_29xxx,
                 .fx2_firmware.cnt = ARRAY_SIZE(pvr2_fw1_names_29xxx),
                 .flag_has_hauppauge_rom = !0,
+                .signal_routing_scheme = PVR2_ROUTING_SCHEME_HAUPPAUGE,
         },
         [PVR2_HDW_TYPE_24XXX] = {
                 .description = "WinTV PVR USB2 Model Category 24xxxx",
@@ -84,6 +85,7 @@ const struct pvr2_device_desc pvr2_device_descriptions[] = {
                 .flag_has_cx25840 = !0,
                 .flag_has_wm8775 = !0,
                 .flag_has_hauppauge_rom = !0,
+                .signal_routing_scheme = PVR2_ROUTING_SCHEME_HAUPPAUGE,
         },
 };
 
diff --git a/drivers/media/video/pvrusb2/pvrusb2-devattr.h b/drivers/media/video/pvrusb2/pvrusb2-devattr.h
index f63c3ddb8a72..05eb2c669ee8 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-devattr.h
+++ b/drivers/media/video/pvrusb2/pvrusb2-devattr.h
@@ -35,6 +35,7 @@ struct pvr2_string_table {
         unsigned int cnt;
 };
 
+#define PVR2_ROUTING_SCHEME_HAUPPAUGE 0
 
 /* This describes a particular hardware type (except for the USB device ID
    which must live in a separate structure due to environmental
@@ -55,6 +56,14 @@ struct pvr2_device_desc {
            was initialized from internal ROM. */
         struct pvr2_string_table fx2_firmware;
 
+        /* Signal routing scheme used by device, contains one of
+           PVR2_ROUTING_SCHEME_XXX.  Schemes have to be defined as we
+           encounter them.  This is an arbitrary integer scheme id; its
+           meaning is contained entirely within the driver and is
+           interpreted by logic which must send commands to the chip-level
+           drivers (search for things which touch this field). */
+        unsigned int signal_routing_scheme;
+
         /* V4L tuner type ID to use with this device (only used if the
            driver could not discover the type any other way). */
         int default_tuner_type;
diff --git a/drivers/media/video/pvrusb2/pvrusb2-video-v4l.c b/drivers/media/video/pvrusb2/pvrusb2-video-v4l.c
index 767e49022f9b..7c47345501b6 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-video-v4l.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-video-v4l.c
@@ -49,29 +49,50 @@ struct pvr2_v4l_decoder {
 };
 
 
+struct routing_scheme {
+        const int *def;
+        unsigned int cnt;
+};
+
+
+static const int routing_scheme0[] = {
+        [PVR2_CVAL_INPUT_TV] = SAA7115_COMPOSITE4,
+        /* In radio mode, we mute the video, but point at one
+           spot just to stay consistent */
+        [PVR2_CVAL_INPUT_RADIO] = SAA7115_COMPOSITE5,
+        [PVR2_CVAL_INPUT_COMPOSITE] = SAA7115_COMPOSITE5,
+        [PVR2_CVAL_INPUT_SVIDEO] =  SAA7115_SVIDEO2,
+};
+
+static const struct routing_scheme routing_schemes[] = {
+        [PVR2_ROUTING_SCHEME_HAUPPAUGE] = {
+                .def = routing_scheme0,
+                .cnt = ARRAY_SIZE(routing_scheme0),
+        },
+};
+
 static void set_input(struct pvr2_v4l_decoder *ctxt)
 {
         struct pvr2_hdw *hdw = ctxt->hdw;
         struct v4l2_routing route;
+        const struct routing_scheme *sp;
+        unsigned int sid = hdw->hdw_desc->signal_routing_scheme;
 
         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_input(%d)",hdw->input_val);
-        switch(hdw->input_val) {
-        case PVR2_CVAL_INPUT_TV:
-                route.input = SAA7115_COMPOSITE4;
-                break;
-        case PVR2_CVAL_INPUT_COMPOSITE:
-                route.input = SAA7115_COMPOSITE5;
-                break;
-        case PVR2_CVAL_INPUT_SVIDEO:
-                route.input = SAA7115_SVIDEO2;
-                break;
-        case PVR2_CVAL_INPUT_RADIO:
-                // In radio mode, we mute the video, but point at one
-                // spot just to stay consistent
-                route.input = SAA7115_COMPOSITE5;
-        default:
+
+        if ((sid < ARRAY_SIZE(routing_schemes)) &&
+            ((sp = routing_schemes + sid) != 0) &&
+            (hdw->input_val >= 0) &&
+            (hdw->input_val < sp->cnt)) {
+                route.input = sp->def[hdw->input_val];
+        } else {
+                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
+                           "*** WARNING *** i2c v4l2 set_input:"
+                           " Invalid routing scheme (%u) and/or input (%d)",
+                           sid,hdw->input_val);
                 return;
         }
+
         route.output = 0;
         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_VIDEO_ROUTING,&route);
 }