V4L/DVB: dvb: add support for kworld 340u and ub435-q to em28xx-dvb

This adds support for the KWorld PlusTV 340U and KWorld UB345-Q ATSC
sticks, which are really the same device. The sticks have an eMPIA
em2870 usb bridge chipset, an LG Electronics LGDT3304 ATSC/QAM
demodulator and an NXP TDA18271HD tuner -- early versions of the 340U
have a a TDA18271HD/C1, later models and the UB435-Q have a C2.

The stick has been tested succesfully with both VSB_8 and QAM_256 signals.
Its using lgdt3304 support added to the lgdt3305 driver by a prior patch,
rather than the current lgdt3304 driver, as its severely lacking in
functionality by comparison (see said patch for details).

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/video4linux/CARDLIST.em28xx

@@ -72,3 +72,4 @@
  73 -> Reddo DVB-C USB TV Box                   (em2870)
  74 -> Actionmaster/LinXcel/Digitus VC211A      (em2800)
  75 -> Dikom DK300                              (em2882)
+ 76 -> KWorld PlusTV 340U or UB435-Q (ATSC)     (em2870)        [1b80:a340]

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

@@ -158,6 +158,22 @@ static struct em28xx_reg_seq evga_indtube_digital[] = {
 	{ -1,			-1,	-1,		-1},
 };
 
+/*
+ * KWorld PlusTV 340U and UB435-Q (ATSC) GPIOs map:
+ * EM_GPIO_0 - currently unknown
+ * EM_GPIO_1 - LED disable/enable (1 = off, 0 = on)
+ * EM_GPIO_2 - currently unknown
+ * EM_GPIO_3 - currently unknown
+ * EM_GPIO_4 - TDA18271HD/C1 tuner (1 = active, 0 = in reset)
+ * EM_GPIO_5 - LGDT3304 ATSC/QAM demod (1 = active, 0 = in reset)
+ * EM_GPIO_6 - currently unknown
+ * EM_GPIO_7 - currently unknown
+ */
+static struct em28xx_reg_seq kworld_a340_digital[] = {
+	{EM28XX_R08_GPIO,	0x6d,		~EM_GPIO_4,	10},
+	{ -1,			-1,		-1,		-1},
+};
+
 /* Pinnacle Hybrid Pro eb1a:2881 */
 static struct em28xx_reg_seq pinnacle_hybrid_pro_analog[] = {
 	{EM28XX_R08_GPIO,	0xfd,   ~EM_GPIO_4,	10},
@@ -1667,6 +1683,16 @@ struct em28xx_board em28xx_boards[] = {
 		.tuner_gpio    = reddo_dvb_c_usb_box,
 		.has_dvb       = 1,
 	},
+	/* 1b80:a340 - Empia EM2870, NXP TDA18271HD and LG DT3304, sold
+	 * initially as the KWorld PlusTV 340U, then as the UB435-Q.
+	 * Early variants have a TDA18271HD/C1, later ones a TDA18271HD/C2 */
+	[EM2870_BOARD_KWORLD_A340] = {
+		.name       = "KWorld PlusTV 340U or UB435-Q (ATSC)",
+		.tuner_type = TUNER_ABSENT,	/* Digital-only TDA18271HD */
+		.has_dvb    = 1,
+		.dvb_gpio   = kworld_a340_digital,
+		.tuner_gpio = default_tuner_gpio,
+	},
 };
 const unsigned int em28xx_bcount = ARRAY_SIZE(em28xx_boards);
 
@@ -1788,6 +1814,8 @@ struct usb_device_id em28xx_id_table[] = {
 			.driver_info = EM2820_BOARD_IODATA_GVMVP_SZ },
 	{ USB_DEVICE(0xeb1a, 0x50a6),
 			.driver_info = EM2860_BOARD_GADMEI_UTV330 },
+	{ USB_DEVICE(0x1b80, 0xa340),
+			.driver_info = EM2870_BOARD_KWORLD_A340 },
 	{ },
 };
 MODULE_DEVICE_TABLE(usb, em28xx_id_table);

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

@@ -30,11 +30,13 @@
 #include "tuner-simple.h"
 
 #include "lgdt330x.h"
+#include "lgdt3305.h"
 #include "zl10353.h"
 #include "s5h1409.h"
 #include "mt352.h"
 #include "mt352_priv.h" /* FIXME */
 #include "tda1002x.h"
+#include "tda18271.h"
 
 MODULE_DESCRIPTION("driver for em28xx based DVB cards");
 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
@@ -231,6 +233,18 @@ static struct lgdt330x_config em2880_lgdt3303_dev = {
 	.demod_chip = LGDT3303,
 };
 
+static struct lgdt3305_config em2870_lgdt3304_dev = {
+	.i2c_addr           = 0x0e,
+	.demod_chip         = LGDT3304,
+	.spectral_inversion = 1,
+	.deny_i2c_rptr      = 1,
+	.mpeg_mode          = LGDT3305_MPEG_PARALLEL,
+	.tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
+	.tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
+	.vsb_if_khz         = 3250,
+	.qam_if_khz         = 4000,
+};
+
 static struct zl10353_config em28xx_zl10353_with_xc3028 = {
 	.demod_address = (0x1e >> 1),
 	.no_tuner = 1,
@@ -247,6 +261,17 @@ static struct s5h1409_config em28xx_s5h1409_with_xc3028 = {
 	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK
 };
 
+static struct tda18271_std_map kworld_a340_std_map = {
+	.atsc_6   = { .if_freq = 3250, .agc_mode = 3, .std = 0,
+		      .if_lvl = 1, .rfagc_top = 0x37, },
+	.qam_6    = { .if_freq = 4000, .agc_mode = 3, .std = 1,
+		      .if_lvl = 1, .rfagc_top = 0x37, },
+};
+
+static struct tda18271_config kworld_a340_config = {
+	.std_map           = &kworld_a340_std_map,
+};
+
 static struct zl10353_config em28xx_zl10353_xc3028_no_i2c_gate = {
 	.demod_address = (0x1e >> 1),
 	.no_tuner = 1,
@@ -572,6 +597,14 @@ static int dvb_init(struct em28xx *dev)
 			}
 		}
 		break;
+	case EM2870_BOARD_KWORLD_A340:
+		dvb->frontend = dvb_attach(lgdt3305_attach,
+					   &em2870_lgdt3304_dev,
+					   &dev->i2c_adap);
+		if (dvb->frontend != NULL)
+			dvb_attach(tda18271_attach, dvb->frontend, 0x60,
+				   &dev->i2c_adap, &kworld_a340_config);
+		break;
 	default:
 		em28xx_errdev("/2: The frontend of your DVB/ATSC card"
 				" isn't supported yet\n");

drivers/media/video/em28xx/em28xx.h

@@ -114,6 +114,7 @@
 #define EM2870_BOARD_REDDO_DVB_C_USB_BOX          73
 #define EM2800_BOARD_VC211A			  74
 #define EM2882_BOARD_DIKOM_DK300		  75
+#define EM2870_BOARD_KWORLD_A340		  76
 
 /* Limits minimum and default number of buffers */
 #define EM28XX_MIN_BUF 4