[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>

3 files changed, 54 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index d328616519e7..70dfd3a7242d 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -353,6 +353,17 @@ static struct em28xx_reg_seq hauppauge_930c_digital[] = {
 };
 #endif
 
+/* 1b80:e425 MaxMedia UB425-TC
+ * GPIO_6 - demod reset, 0=active
+ * GPIO_7 - LED, 0=active
+ */
+static struct em28xx_reg_seq maxmedia_ub425_tc[] = {
+        {EM2874_R80_GPIO,  0x83,  0xff,  100},
+        {EM2874_R80_GPIO,  0xc3,  0xff,  100}, /* GPIO_6 = 1 */
+        {EM2874_R80_GPIO,  0x43,  0xff,  000}, /* GPIO_7 = 0 */
+        {-1,                 -1,    -1,   -1},
+};
+
 /*
  *  Board definitions
  */
@@ -1908,6 +1919,17 @@ struct em28xx_board em28xx_boards[] = {
                         .amux     = EM28XX_AMUX_LINE_IN,
                 } },
         },
+        /* 1b80:e425 MaxMedia UB425-TC
+         * Empia EM2874B + Micronas DRX 3913KA2 + NXP TDA18271HDC2 */
+        [EM2874_BOARD_MAXMEDIA_UB425_TC] = {
+                .name          = "MaxMedia UB425-TC",
+                .tuner_type    = TUNER_ABSENT,
+                .tuner_gpio    = maxmedia_ub425_tc,
+                .has_dvb       = 1,
+                .i2c_speed     = EM2874_I2C_SECONDARY_BUS_SELECT |
+                                EM28XX_I2C_CLK_WAIT_ENABLE |
+                                EM28XX_I2C_FREQ_400_KHZ,
+        },
 };
 const unsigned int em28xx_bcount = ARRAY_SIZE(em28xx_boards);
 
@@ -2059,6 +2081,8 @@ struct usb_device_id em28xx_id_table[] = {
                         .driver_info = EM2860_BOARD_HT_VIDBOX_NW03 },
         { USB_DEVICE(0x1b80, 0xe309), /* Sveon STV40 */
                         .driver_info = EM2860_BOARD_EASYCAP },
+        { USB_DEVICE(0x1b80, 0xe425),
+                        .driver_info = EM2874_BOARD_MAXMEDIA_UB425_TC },
         { },
 };
 MODULE_DEVICE_TABLE(usb, em28xx_id_table);
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");
diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h
index 6a27e6109b87..ca90a4dcc93f 100644
--- a/drivers/media/video/em28xx/em28xx.h
+++ b/drivers/media/video/em28xx/em28xx.h
@@ -125,6 +125,7 @@
 #define EM2884_BOARD_HAUPPAUGE_WINTV_HVR_930C     81
 #define EM2884_BOARD_CINERGY_HTC_STICK            82
 #define EM2860_BOARD_HT_VIDBOX_NW03               83
+#define EM2874_BOARD_MAXMEDIA_UB425_TC            84
 
 /* Limits minimum and default number of buffers */
 #define EM28XX_MIN_BUF 4