[media] em28xx: Add support for Leadership ISDB-T

This device uses an em2874B + Sharp 921 One Seg frontend.
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/video4linux/CARDLIST.em28xx

   0 -> Unknown EM2800 video grabber             (em2800)        [eb1a:2800]
-  1 -> Unknown EM2750/28xx video grabber        (em2820/em2840) [eb1a:2710,eb1a:2820,eb1a:2821,eb1a:2860,eb1a:2861,eb1a:2862,eb1a:2863,eb1a:2870,eb1a:2881,eb1a:2883,eb1a:2868]
+  1 -> Unknown EM2750/28xx video grabber        (em2820/em2840) [eb1a:2710,eb1a:2820,eb1a:2821,eb1a:2860,eb1a:2861,eb1a:2862,eb1a:2863,eb1a:2870,eb1a:2881,eb1a:2883,eb1a:2868,eb1a:2875]
   2 -> Terratec Cinergy 250 USB                 (em2820/em2840) [0ccd:0036]
   3 -> Pinnacle PCTV USB 2                      (em2820/em2840) [2304:0208]
   4 -> Hauppauge WinTV USB 2                    (em2820/em2840) [2040:4200,2040:4201]

drivers/media/video/em28xx/Kconfig

@@ -37,6 +37,7 @@ config VIDEO_EM28XX_DVB
 	select DVB_LGDT330X if !DVB_FE_CUSTOMISE
 	select DVB_ZL10353 if !DVB_FE_CUSTOMISE
 	select DVB_TDA10023 if !DVB_FE_CUSTOMISE
+	select DVB_S921 if !DVB_FE_CUSTOMISE
 	select VIDEOBUF_DVB
 	---help---
 	  This adds support for DVB cards based on the

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

@@ -268,6 +268,20 @@ static struct em28xx_reg_seq dikom_dk300_digital[] = {
 };
 
 
+/* Reset for the most [digital] boards */
+static struct em28xx_reg_seq leadership_digital[] = {
+	{EM2874_R80_GPIO,	0x70,	0xff,	10},
+	{	-1,		-1,	-1,	-1},
+};
+
+static struct em28xx_reg_seq leadership_reset[] = {
+	{EM2874_R80_GPIO,	0xf0,	0xff,	10},
+	{EM2874_R80_GPIO,	0xb0,	0xff,	10},
+	{EM2874_R80_GPIO,	0xf0,	0xff,	10},
+	{	-1,		-1,	-1,	-1},
+};
+
+
 /*
  *  Board definitions
  */
@@ -1224,6 +1238,19 @@ struct em28xx_board em28xx_boards[] = {
 			.vmux     = SAA7115_COMPOSITE0,
 		} },
 	},
+
+	[EM2874_LEADERSHIP_ISDBT] = {
+		.i2c_speed      = EM2874_I2C_SECONDARY_BUS_SELECT |
+				  EM28XX_I2C_CLK_WAIT_ENABLE |
+				  EM28XX_I2C_FREQ_100_KHZ,
+		.xclk		= EM28XX_XCLK_FREQUENCY_10MHZ,
+		.name		= "EM2874 Leadership ISDBT",
+		.tuner_type	= TUNER_ABSENT,
+		.tuner_gpio     = leadership_reset,
+		.dvb_gpio       = leadership_digital,
+		.has_dvb	= 1,
+	},
+
 	[EM2880_BOARD_MSI_DIGIVOX_AD] = {
 		.name         = "MSI DigiVox A/D",
 		.valid        = EM28XX_BOARD_NOT_VALIDATED,
@@ -1754,6 +1781,8 @@ struct usb_device_id em28xx_id_table[] = {
 			.driver_info = EM2820_BOARD_UNKNOWN },
 	{ USB_DEVICE(0xeb1a, 0x2868),
 			.driver_info = EM2820_BOARD_UNKNOWN },
+	{ USB_DEVICE(0xeb1a, 0x2875),
+			.driver_info = EM2820_BOARD_UNKNOWN },
 	{ USB_DEVICE(0xeb1a, 0xe300),
 			.driver_info = EM2861_BOARD_KWORLD_PVRTV_300U },
 	{ USB_DEVICE(0xeb1a, 0xe303),
@@ -1873,6 +1902,7 @@ static struct em28xx_hash_table em28xx_i2c_hash[] = {
 	{0x77800080, EM2860_BOARD_TVP5150_REFERENCE_DESIGN, TUNER_ABSENT},
 	{0xc51200e3, EM2820_BOARD_GADMEI_TVR200, TUNER_LG_PAL_NEW_TAPC},
 	{0x4ba50080, EM2861_BOARD_GADMEI_UTV330PLUS, TUNER_TNF_5335MF},
+	{0x6b800080, EM2874_LEADERSHIP_ISDBT, TUNER_ABSENT},
 };
 
 /* I2C possible address to saa7115, tvp5150, msp3400, tvaudio */
@@ -2430,8 +2460,36 @@ void em28xx_card_setup(struct em28xx *dev)
 			dev->board.is_webcam = 0;
 		else
 			dev->progressive = 1;
-	} else
+	}
+
+	if (!dev->board.is_webcam) {
+		switch (dev->model) {
+		case EM2820_BOARD_UNKNOWN:
+		case EM2800_BOARD_UNKNOWN:
+		/*
+		 * The K-WORLD DVB-T 310U is detected as an MSI Digivox AD.
+		 *
+		 * This occurs because they share identical USB vendor and
+		 * product IDs.
+		 *
+		 * What we do here is look up the EEPROM hash of the K-WORLD
+		 * and if it is found then we decide that we do not have
+		 * a DIGIVOX and reset the device to the K-WORLD instead.
+		 *
+		 * This solution is only valid if they do not share eeprom
+		 * hash identities which has not been determined as yet.
+		 */
+		if (em28xx_hint_board(dev) < 0)
+			em28xx_errdev("Board not discovered\n");
+		else {
+			em28xx_set_model(dev);
+			em28xx_pre_card_setup(dev);
+		}
+		break;
+		default:
 			em28xx_set_model(dev);
+		}
+	}
 
 	em28xx_info("Identified as %s (card=%d)\n",
 		    dev->board.name, dev->model);
@@ -2749,8 +2807,8 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
 	em28xx_pre_card_setup(dev);
 
 	if (!dev->board.is_em2800) {
-		/* Sets I2C speed to 100 KHz */
-		retval = em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
+		/* Resets I2C speed */
+		em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, dev->board.i2c_speed);
 		if (retval < 0) {
 			em28xx_errdev("%s: em28xx_write_regs_req failed!"
 				      " retval [%d]\n",

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

@@ -37,6 +37,7 @@
 #include "mt352_priv.h" /* FIXME */
 #include "tda1002x.h"
 #include "tda18271.h"
+#include "s921.h"
 
 MODULE_DESCRIPTION("driver for em28xx based DVB cards");
 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
@@ -245,6 +246,10 @@ static struct lgdt3305_config em2870_lgdt3304_dev = {
 	.qam_if_khz         = 4000,
 };
 
+static struct s921_config sharp_isdbt = {
+	.demod_address = 0x30 >> 1
+};
+
 static struct zl10353_config em28xx_zl10353_with_xc3028 = {
 	.demod_address = (0x1e >> 1),
 	.no_tuner = 1,
@@ -481,6 +486,7 @@ static int dvb_init(struct em28xx *dev)
 
 	if (!dev->board.has_dvb) {
 		/* This device does not support the extension */
+		printk(KERN_INFO "em28xx_dvb: This device does not support the extension\n");
 		return 0;
 	}
 
@@ -496,6 +502,16 @@ static int dvb_init(struct em28xx *dev)
 	em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
 	/* init frontend */
 	switch (dev->model) {
+	case EM2874_LEADERSHIP_ISDBT:
+		dvb->frontend = dvb_attach(s921_attach,
+				&sharp_isdbt, &dev->i2c_adap);
+
+		if (!dvb->frontend) {
+			result = -EINVAL;
+			goto out_free;
+		}
+
+		break;
 	case EM2883_BOARD_HAUPPAUGE_WINTV_HVR_850:
 	case EM2883_BOARD_HAUPPAUGE_WINTV_HVR_950:
 	case EM2880_BOARD_PINNACLE_PCTV_HD_PRO:

drivers/media/video/em28xx/em28xx.h

@@ -117,6 +117,8 @@
 #define EM2800_BOARD_VC211A			  74
 #define EM2882_BOARD_DIKOM_DK300		  75
 #define EM2870_BOARD_KWORLD_A340		  76
+#define EM2874_LEADERSHIP_ISDBT			  77
+
 
 /* Limits minimum and default number of buffers */
 #define EM28XX_MIN_BUF 4