[media] em28xx: support for 2304:0242 PCTV QuatroStick (510e)

It is mostly copy/paste of the 520e code with setting GPIO7 removed
(no LED light).

I've worked on just released vanilla linux-3.3.0 kernel, so there may
be 1/2 lines offset to the internal working source, but most of the
code should apply cleanly.

I was able to get the DVB-C working (tuned and watched TV). Haven't
tested DVB-T (no signal atm).

Special thanks to everybody who worked on the code and to Antti
Palosaari and Devin Heitmueller who provided essential support on irc.

Hardware is based of:
Empia EM2884
Micronas DRX 3926K
NXP TDA18271HDC2
AVF4910 (not used atm)
Signed-off-by: Ivan Kalvachev <ikalvachev@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-cards.c

@@ -364,6 +364,19 @@ static struct em28xx_reg_seq maxmedia_ub425_tc[] = {
 	{-1,                 -1,    -1,   -1},
 };
 
+/* 2304:0242 PCTV QuatroStick (510e)
+ * GPIO_2: decoder reset, 0=active
+ * GPIO_4: decoder suspend, 0=active
+ * GPIO_6: demod reset, 0=active
+ * GPIO_7: LED, 1=active
+ */
+static struct em28xx_reg_seq pctv_510e[] = {
+	{EM2874_R80_GPIO, 0x10, 0xff, 100},
+	{EM2874_R80_GPIO, 0x14, 0xff, 100}, /* GPIO_2 = 1 */
+	{EM2874_R80_GPIO, 0x54, 0xff, 050}, /* GPIO_6 = 1 */
+	{             -1,   -1,   -1,  -1},
+};
+
 /* 2013:0251 PCTV QuatroStick nano (520e)
  * GPIO_2: decoder reset, 0=active
  * GPIO_4: decoder suspend, 0=active
@@ -1944,6 +1957,18 @@ struct em28xx_board em28xx_boards[] = {
 				EM28XX_I2C_CLK_WAIT_ENABLE |
 				EM28XX_I2C_FREQ_400_KHZ,
 	},
+	/* 2304:0242 PCTV QuatroStick (510e)
+	 * Empia EM2884 + Micronas DRX 3926K + NXP TDA18271HDC2 */
+	[EM2884_BOARD_PCTV_510E] = {
+		.name          = "PCTV QuatroStick (510e)",
+		.tuner_type    = TUNER_ABSENT,
+		.tuner_gpio    = pctv_510e,
+		.has_dvb       = 1,
+		.ir_codes      = RC_MAP_PINNACLE_PCTV_HD,
+		.i2c_speed     = EM2874_I2C_SECONDARY_BUS_SELECT |
+				EM28XX_I2C_CLK_WAIT_ENABLE |
+				EM28XX_I2C_FREQ_400_KHZ,
+	},
 	/* 2013:0251 PCTV QuatroStick nano (520e)
 	 * Empia EM2884 + Micronas DRX 3926K + NXP TDA18271HDC2 */
 	[EM2884_BOARD_PCTV_520E] = {
@@ -2109,6 +2134,8 @@ struct usb_device_id em28xx_id_table[] = {
 			.driver_info = EM2860_BOARD_EASYCAP },
 	{ USB_DEVICE(0x1b80, 0xe425),
 			.driver_info = EM2874_BOARD_MAXMEDIA_UB425_TC },
+	{ USB_DEVICE(0x2304, 0x0242),
+			.driver_info = EM2884_BOARD_PCTV_510E },
 	{ USB_DEVICE(0x2013, 0x0251),
 			.driver_info = EM2884_BOARD_PCTV_520E },
 	{ },

drivers/media/video/em28xx/em28xx-dvb.c

@@ -338,6 +338,13 @@ struct drxk_config pctv_520e_drxk = {
 	.chunk_size = 58,
 };
 
+struct drxk_config pctv_520e_drxk = {
+	.adr = 0x29,
+	.single_master = 1,
+	.microcode_name = "dvb-demod-drxk-pctv.fw",
+	.chunk_size = 58,
+};
+
 static int drxk_gate_ctrl(struct dvb_frontend *fe, int enable)
 {
 	struct em28xx_dvb *dvb = fe->sec_priv;
@@ -498,6 +505,33 @@ static void pctv_520e_init(struct em28xx *dev)
 		i2c_master_send(&dev->i2c_client, regs[i].r, regs[i].len);
 };
 
+static void pctv_520e_init(struct em28xx *dev)
+{
+	/*
+	 * Init TDA8295(?) analog demodulator. Looks like I2C traffic to
+	 * digital demodulator and tuner are routed via TDA8295.
+	 */
+	int i;
+	struct {
+		unsigned char r[4];
+		int len;
+	} regs[] = {
+		{{ 0x06, 0x02, 0x00, 0x31 }, 4},
+		{{ 0x01, 0x02 }, 2},
+		{{ 0x01, 0x02, 0x00, 0xc6 }, 4},
+		{{ 0x01, 0x00 }, 2},
+		{{ 0x01, 0x00, 0xff, 0xaf }, 4},
+		{{ 0x01, 0x00, 0x03, 0xa0 }, 4},
+		{{ 0x01, 0x00 }, 2},
+		{{ 0x01, 0x00, 0x73, 0xaf }, 4},
+	};
+
+	dev->i2c_client.addr = 0x82 >> 1; /* 0x41 */
+
+	for (i = 0; i < ARRAY_SIZE(regs); i++)
+		i2c_master_send(&dev->i2c_client, regs[i].r, regs[i].len);
+};
+
 static int em28xx_mt352_terratec_xs_init(struct dvb_frontend *fe)
 {
 	/* Values extracted from a USB trace of the Terratec Windows driver */
@@ -1002,6 +1036,25 @@ static int em28xx_dvb_init(struct em28xx *dev)
 	case EM2884_BOARD_PCTV_520E:
 		pctv_520e_init(dev);
 
+		/* attach demodulator */
+		dvb->fe[0] = dvb_attach(drxk_attach, &pctv_520e_drxk,
+				&dev->i2c_adap);
+
+		if (dvb->fe[0]) {
+			/* attach tuner */
+			if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
+					&dev->i2c_adap,
+					&em28xx_cxd2820r_tda18271_config)) {
+				dvb_frontend_detach(dvb->fe[0]);
+				result = -EINVAL;
+				goto out_free;
+			}
+		}
+		break;
+	case EM2884_BOARD_PCTV_510E:
+	case EM2884_BOARD_PCTV_520E:
+		pctv_520e_init(dev);
+
 		/* attach demodulator */
 		dvb->fe[0] = dvb_attach(drxk_attach, &pctv_520e_drxk,
 				&dev->i2c_adap);

drivers/media/video/em28xx/em28xx.h

@@ -126,7 +126,8 @@
 #define EM2884_BOARD_CINERGY_HTC_STICK		  82
 #define EM2860_BOARD_HT_VIDBOX_NW03 		  83
 #define EM2874_BOARD_MAXMEDIA_UB425_TC            84
-#define EM2884_BOARD_PCTV_520E                    85
+#define EM2884_BOARD_PCTV_510E                    85
+#define EM2884_BOARD_PCTV_520E                    86
 
 /* Limits minimum and default number of buffers */
 #define EM28XX_MIN_BUF 4