[media] em28xx: support for 1b80:e425 MaxMedia UB425-TC

Hardware is based of:
Empia EM2874B
Micronas DRX 3913KA2
NXP TDA18271HDC2

Only DVB-C supported currently since missing firmware.
According to my tests, DRX 3913KA2 demodulator requires firmware
in order to support DVB-T mode.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-dvb.c b/drivers/media/video/em28xx/em28xx-dvb.c
index fbd90104323d..0b3e301adde9 100644
--- a/drivers/media/video/em28xx/em28xx-dvb.c
+++ b/drivers/media/video/em28xx/em28xx-dvb.c
@@ -325,6 +325,12 @@ struct drxk_config hauppauge_930c_drxk = {
         .chunk_size = 56,
 };
 
+struct drxk_config maxmedia_ub425_tc_drxk = {
+        .adr = 0x29,
+        .single_master = 1,
+        .no_i2c_bridge = 1,
+};
+
 static int drxk_gate_ctrl(struct dvb_frontend *fe, int enable)
 {
         struct em28xx_dvb *dvb = fe->sec_priv;
@@ -936,6 +942,29 @@ static int em28xx_dvb_init(struct em28xx *dev)
                         dvb_attach(a8293_attach, dvb->fe[0], &dev->i2c_adap,
                                 &em28xx_a8293_config);
                 break;
+        case EM2874_BOARD_MAXMEDIA_UB425_TC:
+                /* attach demodulator */
+                dvb->fe[0] = dvb_attach(drxk_attach, &maxmedia_ub425_tc_drxk,
+                                &dev->i2c_adap);
+
+                if (dvb->fe[0]) {
+                        /* disable I2C-gate */
+                        dvb->fe[0]->ops.i2c_gate_ctrl = NULL;
+
+                        /* attach tuner */
+                        if (!dvb_attach(tda18271c2dd_attach, dvb->fe[0],
+                                        &dev->i2c_adap, 0x60)) {
+                                dvb_frontend_detach(dvb->fe[0]);
+                                result = -EINVAL;
+                                goto out_free;
+                        }
+                }
+
+                /* TODO: we need drx-3913k firmware in order to support DVB-T */
+                em28xx_info("MaxMedia UB425-TC: only DVB-C supported by that " \
+                                "driver version\n");
+
+                break;
         default:
                 em28xx_errdev("/2: The frontend of your DVB/ATSC card"
                                 " isn't supported yet\n");