drivers/media/i2c/adv7170.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * adv7170 - adv7170, adv7171 video encoder driver version 0.0.1
  *
  * Copyright (C) 2002 Maxim Yevtyushkin <max@linuxmedialabs.com>
  *
  * Based on adv7176 driver by:
  *
  * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
  * Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
  * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
  *    - some corrections for Pinnacle Systems Inc. DC10plus card.
  *
  * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
  *    - moved over to linux>=2.4.x i2c protocol (1/1/2003)
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/ioctl.h>
 #include <linux/uaccess.h>
 #include <linux/i2c.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-device.h>

 MODULE_DESCRIPTION("Analog Devices ADV7170 video encoder driver");
 MODULE_AUTHOR("Maxim Yevtyushkin");
 MODULE_LICENSE("GPL");


 static int debug;
 module_param(debug, int, 0);
 MODULE_PARM_DESC(debug, "Debug level (0-1)");

 /* ----------------------------------------------------------------------- */

 struct adv7170 {
 	struct v4l2_subdev sd;
 	unsigned char reg[128];

 	v4l2_std_id norm;
 	int input;
 };

 static inline struct adv7170 *to_adv7170(struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct adv7170, sd);
 }

 static char *inputs[] = { "pass_through", "play_back" };

 static u32 adv7170_codes[] = {
 	MEDIA_BUS_FMT_UYVY8_2X8,
 	MEDIA_BUS_FMT_UYVY8_1X16,
 };

 /* ----------------------------------------------------------------------- */

 static inline int adv7170_write(struct v4l2_subdev *sd, u8 reg, u8 value)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	struct adv7170 *encoder = to_adv7170(sd);

 	encoder->reg[reg] = value;
 	return i2c_smbus_write_byte_data(client, reg, value);
 }

 static inline int adv7170_read(struct v4l2_subdev *sd, u8 reg)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);

 	return i2c_smbus_read_byte_data(client, reg);
 }

 static int adv7170_write_block(struct v4l2_subdev *sd,
 		     const u8 *data, unsigned int len)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	struct adv7170 *encoder = to_adv7170(sd);
 	int ret = -1;
 	u8 reg;

 	/* the adv7170 has an autoincrement function, use it if
 	 * the adapter understands raw I2C */
 	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		/* do raw I2C, not smbus compatible */
 		u8 block_data[32];
 		int block_len;

 		while (len >= 2) {
 			block_len = 0;
 			block_data[block_len++] = reg = data[0];
 			do {
 				block_data[block_len++] =
 				    encoder->reg[reg++] = data[1];
 				len -= 2;
 				data += 2;
 			} while (len >= 2 && data[0] == reg && block_len < 32);
 			ret = i2c_master_send(client, block_data, block_len);
 			if (ret < 0)
 				break;
 		}
 	} else {
 		/* do some slow I2C emulation kind of thing */
 		while (len >= 2) {
 			reg = *data++;
 			ret = adv7170_write(sd, reg, *data++);
 			if (ret < 0)
 				break;
 			len -= 2;
 		}
 	}
 	return ret;
 }

 /* ----------------------------------------------------------------------- */

 #define TR0MODE     0x4c
 #define TR0RST	    0x80

 #define TR1CAPT	    0x00
 #define TR1PLAY	    0x00

 static const unsigned char init_NTSC[] = {
 	0x00, 0x10,		/* MR0 */
 	0x01, 0x20,		/* MR1 */
 	0x02, 0x0e,		/* MR2 RTC control: bits 2 and 1 */
 	0x03, 0x80,		/* MR3 */
 	0x04, 0x30,		/* MR4 */
 	0x05, 0x00,		/* Reserved */
 	0x06, 0x00,		/* Reserved */
 	0x07, TR0MODE,		/* TM0 */
 	0x08, TR1CAPT,		/* TM1 */
 	0x09, 0x16,		/* Fsc0 */
 	0x0a, 0x7c,		/* Fsc1 */
 	0x0b, 0xf0,		/* Fsc2 */
 	0x0c, 0x21,		/* Fsc3 */
 	0x0d, 0x00,		/* Subcarrier Phase */
 	0x0e, 0x00,		/* Closed Capt. Ext 0 */
 	0x0f, 0x00,		/* Closed Capt. Ext 1 */
 	0x10, 0x00,		/* Closed Capt. 0 */
 	0x11, 0x00,		/* Closed Capt. 1 */
 	0x12, 0x00,		/* Pedestal Ctl 0 */
 	0x13, 0x00,		/* Pedestal Ctl 1 */
 	0x14, 0x00,		/* Pedestal Ctl 2 */
 	0x15, 0x00,		/* Pedestal Ctl 3 */
 	0x16, 0x00,		/* CGMS_WSS_0 */
 	0x17, 0x00,		/* CGMS_WSS_1 */
 	0x18, 0x00,		/* CGMS_WSS_2 */
 	0x19, 0x00,		/* Teletext Ctl */
 };

 static const unsigned char init_PAL[] = {
 	0x00, 0x71,		/* MR0 */
 	0x01, 0x20,		/* MR1 */
 	0x02, 0x0e,		/* MR2 RTC control: bits 2 and 1 */
 	0x03, 0x80,		/* MR3 */
 	0x04, 0x30,		/* MR4 */
 	0x05, 0x00,		/* Reserved */
 	0x06, 0x00,		/* Reserved */
 	0x07, TR0MODE,		/* TM0 */
 	0x08, TR1CAPT,		/* TM1 */
 	0x09, 0xcb,		/* Fsc0 */
 	0x0a, 0x8a,		/* Fsc1 */
 	0x0b, 0x09,		/* Fsc2 */
 	0x0c, 0x2a,		/* Fsc3 */
 	0x0d, 0x00,		/* Subcarrier Phase */
 	0x0e, 0x00,		/* Closed Capt. Ext 0 */
 	0x0f, 0x00,		/* Closed Capt. Ext 1 */
 	0x10, 0x00,		/* Closed Capt. 0 */
 	0x11, 0x00,		/* Closed Capt. 1 */
 	0x12, 0x00,		/* Pedestal Ctl 0 */
 	0x13, 0x00,		/* Pedestal Ctl 1 */
 	0x14, 0x00,		/* Pedestal Ctl 2 */
 	0x15, 0x00,		/* Pedestal Ctl 3 */
 	0x16, 0x00,		/* CGMS_WSS_0 */
 	0x17, 0x00,		/* CGMS_WSS_1 */
 	0x18, 0x00,		/* CGMS_WSS_2 */
 	0x19, 0x00,		/* Teletext Ctl */
 };


 static int adv7170_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
 {
 	struct adv7170 *encoder = to_adv7170(sd);

 	v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);

 	if (std & V4L2_STD_NTSC) {
 		adv7170_write_block(sd, init_NTSC, sizeof(init_NTSC));
 		if (encoder->input == 0)
 			adv7170_write(sd, 0x02, 0x0e);	/* Enable genlock */
 		adv7170_write(sd, 0x07, TR0MODE | TR0RST);
 		adv7170_write(sd, 0x07, TR0MODE);
 	} else if (std & V4L2_STD_PAL) {
 		adv7170_write_block(sd, init_PAL, sizeof(init_PAL));
 		if (encoder->input == 0)
 			adv7170_write(sd, 0x02, 0x0e);	/* Enable genlock */
 		adv7170_write(sd, 0x07, TR0MODE | TR0RST);
 		adv7170_write(sd, 0x07, TR0MODE);
 	} else {
 		v4l2_dbg(1, debug, sd, "illegal norm: %llx\n",
 				(unsigned long long)std);
 		return -EINVAL;
 	}
 	v4l2_dbg(1, debug, sd, "switched to %llx\n", (unsigned long long)std);
 	encoder->norm = std;
 	return 0;
 }

 static int adv7170_s_routing(struct v4l2_subdev *sd,
 			     u32 input, u32 output, u32 config)
 {
 	struct adv7170 *encoder = to_adv7170(sd);

 	/* RJ: input = 0: input is from decoder
 	   input = 1: input is from ZR36060
 	   input = 2: color bar */

 	v4l2_dbg(1, debug, sd, "set input from %s\n",
 			input == 0 ? "decoder" : "ZR36060");

 	switch (input) {
 	case 0:
 		adv7170_write(sd, 0x01, 0x20);
 		adv7170_write(sd, 0x08, TR1CAPT);	/* TR1 */
 		adv7170_write(sd, 0x02, 0x0e);	/* Enable genlock */
 		adv7170_write(sd, 0x07, TR0MODE | TR0RST);
 		adv7170_write(sd, 0x07, TR0MODE);
 		/* udelay(10); */
 		break;

 	case 1:
 		adv7170_write(sd, 0x01, 0x00);
 		adv7170_write(sd, 0x08, TR1PLAY);	/* TR1 */
 		adv7170_write(sd, 0x02, 0x08);
 		adv7170_write(sd, 0x07, TR0MODE | TR0RST);
 		adv7170_write(sd, 0x07, TR0MODE);
 		/* udelay(10); */
 		break;

 	default:
 		v4l2_dbg(1, debug, sd, "illegal input: %d\n", input);
 		return -EINVAL;
 	}
 	v4l2_dbg(1, debug, sd, "switched to %s\n", inputs[input]);
 	encoder->input = input;
 	return 0;
 }

 static int adv7170_enum_mbus_code(struct v4l2_subdev *sd,
 		struct v4l2_subdev_state *sd_state,
 		struct v4l2_subdev_mbus_code_enum *code)
 {
 	if (code->pad || code->index >= ARRAY_SIZE(adv7170_codes))
 		return -EINVAL;

 	code->code = adv7170_codes[code->index];
 	return 0;
 }

 static int adv7170_get_fmt(struct v4l2_subdev *sd,
 		struct v4l2_subdev_state *sd_state,
 		struct v4l2_subdev_format *format)
 {
 	struct v4l2_mbus_framefmt *mf = &format->format;
 	u8 val = adv7170_read(sd, 0x7);

 	if (format->pad)
 		return -EINVAL;

 	if ((val & 0x40) == (1 << 6))
 		mf->code = MEDIA_BUS_FMT_UYVY8_1X16;
 	else
 		mf->code = MEDIA_BUS_FMT_UYVY8_2X8;

 	mf->colorspace  = V4L2_COLORSPACE_SMPTE170M;
 	mf->width       = 0;
 	mf->height      = 0;
 	mf->field       = V4L2_FIELD_ANY;

 	return 0;
 }

 static int adv7170_set_fmt(struct v4l2_subdev *sd,
 		struct v4l2_subdev_state *sd_state,
 		struct v4l2_subdev_format *format)
 {
 	struct v4l2_mbus_framefmt *mf = &format->format;
 	u8 val = adv7170_read(sd, 0x7);

 	if (format->pad)
 		return -EINVAL;

 	switch (mf->code) {
 	case MEDIA_BUS_FMT_UYVY8_2X8:
 		val &= ~0x40;
 		break;

 	case MEDIA_BUS_FMT_UYVY8_1X16:
 		val |= 0x40;
 		break;

 	default:
 		v4l2_dbg(1, debug, sd,
 			"illegal v4l2_mbus_framefmt code: %d\n", mf->code);
 		return -EINVAL;
 	}

 	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 		return adv7170_write(sd, 0x7, val);

 	return 0;
 }

 /* ----------------------------------------------------------------------- */

 static const struct v4l2_subdev_video_ops adv7170_video_ops = {
 	.s_std_output = adv7170_s_std_output,
 	.s_routing = adv7170_s_routing,
 };

 static const struct v4l2_subdev_pad_ops adv7170_pad_ops = {
 	.enum_mbus_code = adv7170_enum_mbus_code,
 	.get_fmt = adv7170_get_fmt,
 	.set_fmt = adv7170_set_fmt,
 };

 static const struct v4l2_subdev_ops adv7170_ops = {
 	.video = &adv7170_video_ops,
 	.pad = &adv7170_pad_ops,
 };

 /* ----------------------------------------------------------------------- */

 static int adv7170_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct adv7170 *encoder;
 	struct v4l2_subdev *sd;
 	int i;

 	/* Check if the adapter supports the needed features */
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -ENODEV;

 	v4l_info(client, "chip found @ 0x%x (%s)\n",
 			client->addr << 1, client->adapter->name);

 	encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
 	if (encoder == NULL)
 		return -ENOMEM;
 	sd = &encoder->sd;
 	v4l2_i2c_subdev_init(sd, client, &adv7170_ops);
 	encoder->norm = V4L2_STD_NTSC;
 	encoder->input = 0;

 	i = adv7170_write_block(sd, init_NTSC, sizeof(init_NTSC));
 	if (i >= 0) {
 		i = adv7170_write(sd, 0x07, TR0MODE | TR0RST);
 		i = adv7170_write(sd, 0x07, TR0MODE);
 		i = adv7170_read(sd, 0x12);
 		v4l2_dbg(1, debug, sd, "revision %d\n", i & 1);
 	}
 	if (i < 0)
 		v4l2_dbg(1, debug, sd, "init error 0x%x\n", i);
 	return 0;
 }

 static int adv7170_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);

 	v4l2_device_unregister_subdev(sd);
 	return 0;
 }

 /* ----------------------------------------------------------------------- */

 static const struct i2c_device_id adv7170_id[] = {
 	{ "adv7170", 0 },
 	{ "adv7171", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, adv7170_id);

 static struct i2c_driver adv7170_driver = {
 	.driver = {
 		.name	= "adv7170",
 	},
 	.probe		= adv7170_probe,
 	.remove		= adv7170_remove,
 	.id_table	= adv7170_id,
 };

 module_i2c_driver(adv7170_driver);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* adv7170 - adv7170, adv7171 video encoder driver version 0.0.1
	*
	* Copyright (C) 2002 Maxim Yevtyushkin <max@linuxmedialabs.com>
	*
	* Based on adv7176 driver by:
	*
	* Copyright (C) 1998 Dave Perks <dperks@ibm.net>
	* Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
	* Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
	* - some corrections for Pinnacle Systems Inc. DC10plus card.
	*
	* Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
	* - moved over to linux>=2.4.x i2c protocol (1/1/2003)
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/slab.h>
	#include <linux/ioctl.h>
	#include <linux/uaccess.h>
	#include <linux/i2c.h>
	#include <linux/videodev2.h>
	#include <media/v4l2-device.h>

	MODULE_DESCRIPTION("Analog Devices ADV7170 video encoder driver");
	MODULE_AUTHOR("Maxim Yevtyushkin");
	MODULE_LICENSE("GPL");


	static int debug;
	module_param(debug, int, 0);
	MODULE_PARM_DESC(debug, "Debug level (0-1)");

	/* ----------------------------------------------------------------------- */

	struct adv7170 {
	struct v4l2_subdev sd;
	unsigned char reg[128];

	v4l2_std_id norm;
	int input;
	};

	static inline struct adv7170 to_adv7170(struct v4l2_subdev sd)
	{
	return container_of(sd, struct adv7170, sd);
	}

	static char *inputs[] = { "pass_through", "play_back" };

	static u32 adv7170_codes[] = {
	MEDIA_BUS_FMT_UYVY8_2X8,
	MEDIA_BUS_FMT_UYVY8_1X16,
	};

	/* ----------------------------------------------------------------------- */

	static inline int adv7170_write(struct v4l2_subdev *sd, u8 reg, u8 value)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct adv7170 *encoder = to_adv7170(sd);

	encoder->reg[reg] = value;
	return i2c_smbus_write_byte_data(client, reg, value);
	}

	static inline int adv7170_read(struct v4l2_subdev *sd, u8 reg)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	return i2c_smbus_read_byte_data(client, reg);
	}

	static int adv7170_write_block(struct v4l2_subdev *sd,
	const u8 *data, unsigned int len)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct adv7170 *encoder = to_adv7170(sd);
	int ret = -1;
	u8 reg;

	/* the adv7170 has an autoincrement function, use it if
	* the adapter understands raw I2C */
	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	/* do raw I2C, not smbus compatible */
	u8 block_data[32];
	int block_len;

	while (len >= 2) {
	block_len = 0;
	block_data[block_len++] = reg = data[0];
	do {
	block_data[block_len++] =
	encoder->reg[reg++] = data[1];
	len -= 2;
	data += 2;
	} while (len >= 2 && data[0] == reg && block_len < 32);
	ret = i2c_master_send(client, block_data, block_len);
	if (ret < 0)
	break;
	}
	} else {
	/* do some slow I2C emulation kind of thing */
	while (len >= 2) {
	reg = *data++;
	ret = adv7170_write(sd, reg, *data++);
	if (ret < 0)
	break;
	len -= 2;
	}
	}
	return ret;
	}

	/* ----------------------------------------------------------------------- */

	#define TR0MODE 0x4c
	#define TR0RST 0x80

	#define TR1CAPT 0x00
	#define TR1PLAY 0x00

	static const unsigned char init_NTSC[] = {
	0x00, 0x10, /* MR0 */
	0x01, 0x20, /* MR1 */
	0x02, 0x0e, /* MR2 RTC control: bits 2 and 1 */
	0x03, 0x80, /* MR3 */
	0x04, 0x30, /* MR4 */
	0x05, 0x00, /* Reserved */
	0x06, 0x00, /* Reserved */
	0x07, TR0MODE, /* TM0 */
	0x08, TR1CAPT, /* TM1 */
	0x09, 0x16, /* Fsc0 */
	0x0a, 0x7c, /* Fsc1 */
	0x0b, 0xf0, /* Fsc2 */
	0x0c, 0x21, /* Fsc3 */
	0x0d, 0x00, /* Subcarrier Phase */
	0x0e, 0x00, /* Closed Capt. Ext 0 */
	0x0f, 0x00, /* Closed Capt. Ext 1 */
	0x10, 0x00, /* Closed Capt. 0 */
	0x11, 0x00, /* Closed Capt. 1 */
	0x12, 0x00, /* Pedestal Ctl 0 */
	0x13, 0x00, /* Pedestal Ctl 1 */
	0x14, 0x00, /* Pedestal Ctl 2 */
	0x15, 0x00, /* Pedestal Ctl 3 */
	0x16, 0x00, /* CGMS_WSS_0 */
	0x17, 0x00, /* CGMS_WSS_1 */
	0x18, 0x00, /* CGMS_WSS_2 */
	0x19, 0x00, /* Teletext Ctl */
	};

	static const unsigned char init_PAL[] = {
	0x00, 0x71, /* MR0 */
	0x01, 0x20, /* MR1 */
	0x02, 0x0e, /* MR2 RTC control: bits 2 and 1 */
	0x03, 0x80, /* MR3 */
	0x04, 0x30, /* MR4 */
	0x05, 0x00, /* Reserved */
	0x06, 0x00, /* Reserved */
	0x07, TR0MODE, /* TM0 */
	0x08, TR1CAPT, /* TM1 */
	0x09, 0xcb, /* Fsc0 */
	0x0a, 0x8a, /* Fsc1 */
	0x0b, 0x09, /* Fsc2 */
	0x0c, 0x2a, /* Fsc3 */
	0x0d, 0x00, /* Subcarrier Phase */
	0x0e, 0x00, /* Closed Capt. Ext 0 */
	0x0f, 0x00, /* Closed Capt. Ext 1 */
	0x10, 0x00, /* Closed Capt. 0 */
	0x11, 0x00, /* Closed Capt. 1 */
	0x12, 0x00, /* Pedestal Ctl 0 */
	0x13, 0x00, /* Pedestal Ctl 1 */
	0x14, 0x00, /* Pedestal Ctl 2 */
	0x15, 0x00, /* Pedestal Ctl 3 */
	0x16, 0x00, /* CGMS_WSS_0 */
	0x17, 0x00, /* CGMS_WSS_1 */
	0x18, 0x00, /* CGMS_WSS_2 */
	0x19, 0x00, /* Teletext Ctl */
	};


	static int adv7170_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
	{
	struct adv7170 *encoder = to_adv7170(sd);

	v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);

	if (std & V4L2_STD_NTSC) {
	adv7170_write_block(sd, init_NTSC, sizeof(init_NTSC));
	if (encoder->input == 0)
	adv7170_write(sd, 0x02, 0x0e); /* Enable genlock */
	adv7170_write(sd, 0x07, TR0MODE \| TR0RST);
	adv7170_write(sd, 0x07, TR0MODE);
	} else if (std & V4L2_STD_PAL) {
	adv7170_write_block(sd, init_PAL, sizeof(init_PAL));
	if (encoder->input == 0)
	adv7170_write(sd, 0x02, 0x0e); /* Enable genlock */
	adv7170_write(sd, 0x07, TR0MODE \| TR0RST);
	adv7170_write(sd, 0x07, TR0MODE);
	} else {
	v4l2_dbg(1, debug, sd, "illegal norm: %llx\n",
	(unsigned long long)std);
	return -EINVAL;
	}
	v4l2_dbg(1, debug, sd, "switched to %llx\n", (unsigned long long)std);
	encoder->norm = std;
	return 0;
	}

	static int adv7170_s_routing(struct v4l2_subdev *sd,
	u32 input, u32 output, u32 config)
	{
	struct adv7170 *encoder = to_adv7170(sd);

	/* RJ: input = 0: input is from decoder
	input = 1: input is from ZR36060
	input = 2: color bar */

	v4l2_dbg(1, debug, sd, "set input from %s\n",
	input == 0 ? "decoder" : "ZR36060");

	switch (input) {
	case 0:
	adv7170_write(sd, 0x01, 0x20);
	adv7170_write(sd, 0x08, TR1CAPT); /* TR1 */
	adv7170_write(sd, 0x02, 0x0e); /* Enable genlock */
	adv7170_write(sd, 0x07, TR0MODE \| TR0RST);
	adv7170_write(sd, 0x07, TR0MODE);
	/* udelay(10); */
	break;

	case 1:
	adv7170_write(sd, 0x01, 0x00);
	adv7170_write(sd, 0x08, TR1PLAY); /* TR1 */
	adv7170_write(sd, 0x02, 0x08);
	adv7170_write(sd, 0x07, TR0MODE \| TR0RST);
	adv7170_write(sd, 0x07, TR0MODE);
	/* udelay(10); */
	break;

	default:
	v4l2_dbg(1, debug, sd, "illegal input: %d\n", input);
	return -EINVAL;
	}
	v4l2_dbg(1, debug, sd, "switched to %s\n", inputs[input]);
	encoder->input = input;
	return 0;
	}

	static int adv7170_enum_mbus_code(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_mbus_code_enum *code)
	{
	if (code->pad \|\| code->index >= ARRAY_SIZE(adv7170_codes))
	return -EINVAL;

	code->code = adv7170_codes[code->index];
	return 0;
	}

	static int adv7170_get_fmt(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_format *format)
	{
	struct v4l2_mbus_framefmt *mf = &format->format;
	u8 val = adv7170_read(sd, 0x7);

	if (format->pad)
	return -EINVAL;

	if ((val & 0x40) == (1 << 6))
	mf->code = MEDIA_BUS_FMT_UYVY8_1X16;
	else
	mf->code = MEDIA_BUS_FMT_UYVY8_2X8;

	mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
	mf->width = 0;
	mf->height = 0;
	mf->field = V4L2_FIELD_ANY;

	return 0;
	}

	static int adv7170_set_fmt(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_format *format)
	{
	struct v4l2_mbus_framefmt *mf = &format->format;
	u8 val = adv7170_read(sd, 0x7);

	if (format->pad)
	return -EINVAL;

	switch (mf->code) {
	case MEDIA_BUS_FMT_UYVY8_2X8:
	val &= ~0x40;
	break;

	case MEDIA_BUS_FMT_UYVY8_1X16:
	val \|= 0x40;
	break;

	default:
	v4l2_dbg(1, debug, sd,
	"illegal v4l2_mbus_framefmt code: %d\n", mf->code);
	return -EINVAL;
	}

	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
	return adv7170_write(sd, 0x7, val);

	return 0;
	}

	/* ----------------------------------------------------------------------- */

	static const struct v4l2_subdev_video_ops adv7170_video_ops = {
	.s_std_output = adv7170_s_std_output,
	.s_routing = adv7170_s_routing,
	};

	static const struct v4l2_subdev_pad_ops adv7170_pad_ops = {
	.enum_mbus_code = adv7170_enum_mbus_code,
	.get_fmt = adv7170_get_fmt,
	.set_fmt = adv7170_set_fmt,
	};

	static const struct v4l2_subdev_ops adv7170_ops = {
	.video = &adv7170_video_ops,
	.pad = &adv7170_pad_ops,
	};

	/* ----------------------------------------------------------------------- */

	static int adv7170_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct adv7170 *encoder;
	struct v4l2_subdev *sd;
	int i;

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	return -ENODEV;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
	client->addr << 1, client->adapter->name);

	encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
	if (encoder == NULL)
	return -ENOMEM;
	sd = &encoder->sd;
	v4l2_i2c_subdev_init(sd, client, &adv7170_ops);
	encoder->norm = V4L2_STD_NTSC;
	encoder->input = 0;

	i = adv7170_write_block(sd, init_NTSC, sizeof(init_NTSC));
	if (i >= 0) {
	i = adv7170_write(sd, 0x07, TR0MODE \| TR0RST);
	i = adv7170_write(sd, 0x07, TR0MODE);
	i = adv7170_read(sd, 0x12);
	v4l2_dbg(1, debug, sd, "revision %d\n", i & 1);
	}
	if (i < 0)
	v4l2_dbg(1, debug, sd, "init error 0x%x\n", i);
	return 0;
	}

	static int adv7170_remove(struct i2c_client *client)
	{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	return 0;
	}

	/* ----------------------------------------------------------------------- */

	static const struct i2c_device_id adv7170_id[] = {
	{ "adv7170", 0 },
	{ "adv7171", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, adv7170_id);

	static struct i2c_driver adv7170_driver = {
	.driver = {
	.name = "adv7170",
	},
	.probe = adv7170_probe,
	.remove = adv7170_remove,
	.id_table = adv7170_id,
	};

	module_i2c_driver(adv7170_driver);