V4L/DVB (9222): S2API: Add Multiple-frontend on a single adapter support.

A detailed description from the original patches 2 years ago:

"The WinTV-HVR3000 has a single transport bus which is shared between
a DVB-T and DVB-S modulator. These patches build on the bus acquisition
cx88 work from a few weeks ago to add support for this.

So to applications the HVR3000 looks like this:
/dev/dvb/adapter0/fe0 (cx24123 DVB-S demod)
/dev/dvb/adapter0/fe1 (cx22702 DVB-T demod)

Additional boards continue as before, eg:
/dev/dvb/adapter1/fe0 (lgdt3302 ATSC demod)

The basic change is removing the single instance of the videobuf_dvb in
cx8802_dev and saa7134_dev(?) and replacing it with a list and some
supporting functions.

*NOTE* This branch was taken before v4l-dvb was closed for 2.6.19 so
two or three current cx88 patches appear to be reversed by this tree,
this will be cleaned up in the near future. The patches missing change
the mutex handing to core->lock, fix an enumeration problem."

It should be recognised that a number of people have been maintaining
this patchset. Significant levels of Kudos to everyone one involved,
including but not limited to:

Darron Broad
Fabio M. Di Nitto
Carlo Scarfoglio
Hans Werner

Without the work of these people, and countless others, my two year old
patches would of died on the Mercurial linuxtv.org vine a long time
ago.

TODO: Revise these patches a little further so that the need for
demux1 and dvr0 is optional, not mandatory on the HVR3000.

HISTORY (darron):
This is the last update to MFE prepared by Hans which is based
upon the `scratchpad' diff created by Carlo.
All MFE work prior to that point must be attributed to Fabio
who ported and maintained Steve's original patch up to that
time.

Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 66 insertions, 51 deletions

diff --git a/drivers/media/video/cx23885/cx23885-dvb.c b/drivers/media/video/cx23885/cx23885-dvb.c
index 24bd18327aa0..fe1218fd44cb 100644
--- a/drivers/media/video/cx23885/cx23885-dvb.c
+++ b/drivers/media/video/cx23885/cx23885-dvb.c
@@ -312,48 +312,53 @@ static int dvb_register(struct cx23885_tsport *port)
 {
         struct cx23885_dev *dev = port->dev;
         struct cx23885_i2c *i2c_bus = NULL;
+        struct videobuf_dvb_frontend *fe0;
+
+        fe0 = videobuf_dvb_get_frontend(&port->frontends, 0);
+        if (!fe0)
+                return -EINVAL;
 
         /* init struct videobuf_dvb */
-        port->dvb.name = dev->name;
+        fe0->dvb.name = dev->name;
 
         /* init frontend */
         switch (dev->board) {
         case CX23885_BOARD_HAUPPAUGE_HVR1250:
                 i2c_bus = &dev->i2c_bus[0];
-                port->dvb.frontend = dvb_attach(s5h1409_attach,
+                fe0->dvb.frontend = dvb_attach(s5h1409_attach,
                                                 &hauppauge_generic_config,
                                                 &i2c_bus->i2c_adap);
-                if (port->dvb.frontend != NULL) {
-                        dvb_attach(mt2131_attach, port->dvb.frontend,
+                if (fe0->dvb.frontend != NULL) {
+                        dvb_attach(mt2131_attach, fe0->dvb.frontend,
                                    &i2c_bus->i2c_adap,
                                    &hauppauge_generic_tunerconfig, 0);
                 }
                 break;
         case CX23885_BOARD_HAUPPAUGE_HVR1800:
                 i2c_bus = &dev->i2c_bus[0];
-                switch (alt_tuner) {
+                switch (alt_tuner) { // XXXXXX multifrontend?
                 case 1:
-                        port->dvb.frontend =
+                        fe0->dvb.frontend =
                                 dvb_attach(s5h1409_attach,
                                            &hauppauge_ezqam_config,
                                            &i2c_bus->i2c_adap);
-                        if (port->dvb.frontend != NULL) {
-                                dvb_attach(tda829x_attach, port->dvb.frontend,
+                        if (fe0->dvb.frontend != NULL) {
+                                dvb_attach(tda829x_attach, fe0->dvb.frontend,
                                            &dev->i2c_bus[1].i2c_adap, 0x42,
                                            &tda829x_no_probe);
-                                dvb_attach(tda18271_attach, port->dvb.frontend,
+                                dvb_attach(tda18271_attach, fe0->dvb.frontend,
                                            0x60, &dev->i2c_bus[1].i2c_adap,
                                            &hauppauge_tda18271_config);
                         }
                         break;
                 case 0:
                 default:
-                        port->dvb.frontend =
+                        fe0->dvb.frontend =
                                 dvb_attach(s5h1409_attach,
                                            &hauppauge_generic_config,
                                            &i2c_bus->i2c_adap);
-                        if (port->dvb.frontend != NULL)
-                                dvb_attach(mt2131_attach, port->dvb.frontend,
+                        if (fe0->dvb.frontend != NULL)
+                                dvb_attach(mt2131_attach, fe0->dvb.frontend,
                                            &i2c_bus->i2c_adap,
                                            &hauppauge_generic_tunerconfig, 0);
                         break;
@@ -361,42 +366,42 @@ static int dvb_register(struct cx23885_tsport *port)
                 break;
         case CX23885_BOARD_HAUPPAUGE_HVR1800lp:
                 i2c_bus = &dev->i2c_bus[0];
-                port->dvb.frontend = dvb_attach(s5h1409_attach,
+                fe0->dvb.frontend = dvb_attach(s5h1409_attach,
                                                 &hauppauge_hvr1800lp_config,
                                                 &i2c_bus->i2c_adap);
-                if (port->dvb.frontend != NULL) {
-                        dvb_attach(mt2131_attach, port->dvb.frontend,
+                if (fe0->dvb.frontend != NULL) {
+                        dvb_attach(mt2131_attach, fe0->dvb.frontend,
                                    &i2c_bus->i2c_adap,
                                    &hauppauge_generic_tunerconfig, 0);
                 }
                 break;
         case CX23885_BOARD_DVICO_FUSIONHDTV_5_EXP:
                 i2c_bus = &dev->i2c_bus[0];
-                port->dvb.frontend = dvb_attach(lgdt330x_attach,
+                fe0->dvb.frontend = dvb_attach(lgdt330x_attach,
                                                 &fusionhdtv_5_express,
                                                 &i2c_bus->i2c_adap);
-                if (port->dvb.frontend != NULL) {
-                        dvb_attach(simple_tuner_attach, port->dvb.frontend,
+                if (fe0->dvb.frontend != NULL) {
+                        dvb_attach(simple_tuner_attach, fe0->dvb.frontend,
                                    &i2c_bus->i2c_adap, 0x61,
                                    TUNER_LG_TDVS_H06XF);
                 }
                 break;
         case CX23885_BOARD_HAUPPAUGE_HVR1500Q:
                 i2c_bus = &dev->i2c_bus[1];
-                port->dvb.frontend = dvb_attach(s5h1409_attach,
+                fe0->dvb.frontend = dvb_attach(s5h1409_attach,
                                                 &hauppauge_hvr1500q_config,
                                                 &dev->i2c_bus[0].i2c_adap);
-                if (port->dvb.frontend != NULL)
-                        dvb_attach(xc5000_attach, port->dvb.frontend,
+                if (fe0->dvb.frontend != NULL)
+                        dvb_attach(xc5000_attach, fe0->dvb.frontend,
                                    &i2c_bus->i2c_adap,
                                    &hauppauge_hvr1500q_tunerconfig);
                 break;
         case CX23885_BOARD_HAUPPAUGE_HVR1500:
                 i2c_bus = &dev->i2c_bus[1];
-                port->dvb.frontend = dvb_attach(s5h1409_attach,
+                fe0->dvb.frontend = dvb_attach(s5h1409_attach,
                                                 &hauppauge_hvr1500_config,
                                                 &dev->i2c_bus[0].i2c_adap);
-                if (port->dvb.frontend != NULL) {
+                if (fe0->dvb.frontend != NULL) {
                         struct dvb_frontend *fe;
                         struct xc2028_config cfg = {
                                 .i2c_adap  = &i2c_bus->i2c_adap,
@@ -409,7 +414,7 @@ static int dvb_register(struct cx23885_tsport *port)
                         };
 
                         fe = dvb_attach(xc2028_attach,
-                                        port->dvb.frontend, &cfg);
+                                        fe0->dvb.frontend, &cfg);
                         if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
                                 fe->ops.tuner_ops.set_config(fe, &ctl);
                 }
@@ -417,24 +422,24 @@ static int dvb_register(struct cx23885_tsport *port)
         case CX23885_BOARD_HAUPPAUGE_HVR1200:
         case CX23885_BOARD_HAUPPAUGE_HVR1700:
                 i2c_bus = &dev->i2c_bus[0];
-                port->dvb.frontend = dvb_attach(tda10048_attach,
+                fe0->dvb.frontend = dvb_attach(tda10048_attach,
                         &hauppauge_hvr1200_config,
                         &i2c_bus->i2c_adap);
-                if (port->dvb.frontend != NULL) {
-                        dvb_attach(tda829x_attach, port->dvb.frontend,
+                if (fe0->dvb.frontend != NULL) {
+                        dvb_attach(tda829x_attach, fe0->dvb.frontend,
                                 &dev->i2c_bus[1].i2c_adap, 0x42,
                                 &tda829x_no_probe);
-                        dvb_attach(tda18271_attach, port->dvb.frontend,
+                        dvb_attach(tda18271_attach, fe0->dvb.frontend,
                                 0x60, &dev->i2c_bus[1].i2c_adap,
                                 &hauppauge_hvr1200_tuner_config);
                 }
                 break;
         case CX23885_BOARD_HAUPPAUGE_HVR1400:
                 i2c_bus = &dev->i2c_bus[0];
-                port->dvb.frontend = dvb_attach(dib7000p_attach,
+                fe0->dvb.frontend = dvb_attach(dib7000p_attach,
                         &i2c_bus->i2c_adap,
                         0x12, &hauppauge_hvr1400_dib7000_config);
-                if (port->dvb.frontend != NULL) {
+                if (fe0->dvb.frontend != NULL) {
                         struct dvb_frontend *fe;
                         struct xc2028_config cfg = {
                                 .i2c_adap  = &dev->i2c_bus[1].i2c_adap,
@@ -449,7 +454,7 @@ static int dvb_register(struct cx23885_tsport *port)
                         };
 
                         fe = dvb_attach(xc2028_attach,
-                                        port->dvb.frontend, &cfg);
+                                        fe0->dvb.frontend, &cfg);
                         if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
                                 fe->ops.tuner_ops.set_config(fe, &ctl);
                 }
@@ -457,25 +462,25 @@ static int dvb_register(struct cx23885_tsport *port)
         case CX23885_BOARD_DVICO_FUSIONHDTV_7_DUAL_EXP:
                 i2c_bus = &dev->i2c_bus[port->nr - 1];
 
-                port->dvb.frontend = dvb_attach(s5h1409_attach,
+                fe0->dvb.frontend = dvb_attach(s5h1409_attach,
                                                 &dvico_s5h1409_config,
                                                 &i2c_bus->i2c_adap);
-                if (port->dvb.frontend == NULL)
-                        port->dvb.frontend = dvb_attach(s5h1411_attach,
+                if (fe0->dvb.frontend == NULL)
+                        fe0->dvb.frontend = dvb_attach(s5h1411_attach,
                                                         &dvico_s5h1411_config,
                                                         &i2c_bus->i2c_adap);
-                if (port->dvb.frontend != NULL)
-                        dvb_attach(xc5000_attach, port->dvb.frontend,
+                if (fe0->dvb.frontend != NULL)
+                        dvb_attach(xc5000_attach, fe0->dvb.frontend,
                                    &i2c_bus->i2c_adap,
                                    &dvico_xc5000_tunerconfig);
                 break;
         case CX23885_BOARD_DVICO_FUSIONHDTV_DVB_T_DUAL_EXP: {
                 i2c_bus = &dev->i2c_bus[port->nr - 1];
 
-                port->dvb.frontend = dvb_attach(zl10353_attach,
+                fe0->dvb.frontend = dvb_attach(zl10353_attach,
                                                &dvico_fusionhdtv_xc3028,
                                                &i2c_bus->i2c_adap);
-                if (port->dvb.frontend != NULL) {
+                if (fe0->dvb.frontend != NULL) {
                         struct dvb_frontend      *fe;
                         struct xc2028_config      cfg = {
                                 .i2c_adap  = &i2c_bus->i2c_adap,
@@ -487,7 +492,7 @@ static int dvb_register(struct cx23885_tsport *port)
                                 .demod       = XC3028_FE_ZARLINK456,
                         };
 
-                        fe = dvb_attach(xc2028_attach, port->dvb.frontend,
+                        fe = dvb_attach(xc2028_attach, fe0->dvb.frontend,
                                         &cfg);
                         if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
                                 fe->ops.tuner_ops.set_config(fe, &ctl);
@@ -497,10 +502,10 @@ static int dvb_register(struct cx23885_tsport *port)
         case CX23885_BOARD_LEADTEK_WINFAST_PXDVR3200_H:
                 i2c_bus = &dev->i2c_bus[0];
 
-                port->dvb.frontend = dvb_attach(zl10353_attach,
+                fe0->dvb.frontend = dvb_attach(zl10353_attach,
                         &dvico_fusionhdtv_xc3028,
                         &i2c_bus->i2c_adap);
-                if (port->dvb.frontend != NULL) {
+                if (fe0->dvb.frontend != NULL) {
                         struct dvb_frontend      *fe;
                         struct xc2028_config      cfg = {
                                 .i2c_adap  = &dev->i2c_bus[1].i2c_adap,
@@ -512,7 +517,7 @@ static int dvb_register(struct cx23885_tsport *port)
                                 .demod       = XC3028_FE_ZARLINK456,
                         };
 
-                        fe = dvb_attach(xc2028_attach, port->dvb.frontend,
+                        fe = dvb_attach(xc2028_attach, fe0->dvb.frontend,
                                 &cfg);
                         if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
                                 fe->ops.tuner_ops.set_config(fe, &ctl);
@@ -523,29 +528,36 @@ static int dvb_register(struct cx23885_tsport *port)
                        dev->name);
                 break;
         }
-        if (NULL == port->dvb.frontend) {
+        if (NULL == fe0->dvb.frontend) {
                 printk("%s: frontend initialization failed\n", dev->name);
                 return -1;
         }
         /* define general-purpose callback pointer */
-        port->dvb.frontend->callback = cx23885_tuner_callback;
+        fe0->dvb.frontend->callback = cx23885_tuner_callback;
 
         /* Put the analog decoder in standby to keep it quiet */
         cx23885_call_i2c_clients(i2c_bus, TUNER_SET_STANDBY, NULL);
 
-        if (port->dvb.frontend->ops.analog_ops.standby)
-                port->dvb.frontend->ops.analog_ops.standby(port->dvb.frontend);
+        if (fe0->dvb.frontend->ops.analog_ops.standby)
+                fe0->dvb.frontend->ops.analog_ops.standby(fe0->dvb.frontend);
 
         /* register everything */
-        return videobuf_dvb_register(&port->dvb, THIS_MODULE, port,
+        return videobuf_dvb_register_bus(&port->frontends, THIS_MODULE, port,
                                      &dev->pci->dev, adapter_nr);
+
 }
 
 int cx23885_dvb_register(struct cx23885_tsport *port)
 {
+
+        struct videobuf_dvb_frontend *fe0;
         struct cx23885_dev *dev = port->dev;
         int err;
 
+        fe0 = videobuf_dvb_get_frontend(&port->frontends, 0);
+        if (!fe0)
+                err = -EINVAL;
+
         dprintk(1, "%s\n", __func__);
         dprintk(1, " ->being probed by Card=%d Name=%s, PCI %02x:%02x\n",
                 dev->board,
@@ -557,7 +569,7 @@ int cx23885_dvb_register(struct cx23885_tsport *port)
 
         /* dvb stuff */
         printk("%s: cx23885 based dvb card\n", dev->name);
-        videobuf_queue_sg_init(&port->dvb.dvbq, &dvb_qops, &dev->pci->dev, &port->slock,
+        videobuf_queue_sg_init(&fe0->dvb.dvbq, &dvb_qops, &dev->pci->dev, &port->slock,
                             V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_TOP,
                             sizeof(struct cx23885_buffer), port);
         err = dvb_register(port);
@@ -569,9 +581,12 @@ int cx23885_dvb_register(struct cx23885_tsport *port)
 
 int cx23885_dvb_unregister(struct cx23885_tsport *port)
 {
+        struct videobuf_dvb_frontend *fe0;
+
+        fe0 = videobuf_dvb_get_frontend(&port->frontends, 0);
         /* dvb */
-        if(port->dvb.frontend)
-                videobuf_dvb_unregister(&port->dvb);
+        if(fe0->dvb.frontend)
+                videobuf_dvb_unregister_bus(&port->frontends);
 
         return 0;
 }
diff --git a/drivers/media/video/cx23885/cx23885.h b/drivers/media/video/cx23885/cx23885.h
index ba4e0aaed463..aa34bf9ea4d9 100644
--- a/drivers/media/video/cx23885/cx23885.h
+++ b/drivers/media/video/cx23885/cx23885.h
@@ -225,7 +225,7 @@ struct cx23885_tsport {
         int                        nr;
         int                        sram_chno;
 
-        struct videobuf_dvb        dvb;
+        struct videobuf_dvb_frontends frontends;
 
         /* dma queues */
         struct cx23885_dmaqueue    mpegq;