drivers/media/i2c/tw9903.c - linux - Git at Google

 /*
  * Copyright (C) 2005-2006 Micronas USA Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License (Version 2) as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

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

 MODULE_DESCRIPTION("TW9903 I2C subdev driver");
 MODULE_LICENSE("GPL v2");

 /*
  * This driver is based on the wis-tw9903.c source that was in
  * drivers/staging/media/go7007. That source had commented out code for
  * saturation and scaling (neither seemed to work). If anyone ever gets
  * hardware to test this driver, then that code might be useful to look at.
  * You need to get the kernel sources of, say, kernel 3.8 where that
  * wis-tw9903 driver is still present.
  */

 struct tw9903 {
 	struct v4l2_subdev sd;
 	struct v4l2_ctrl_handler hdl;
 	v4l2_std_id norm;
 };

 static inline struct tw9903 *to_state(struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct tw9903, sd);
 }

 static const u8 initial_registers[] = {
 	0x02, 0x44, /* input 1, composite */
 	0x03, 0x92, /* correct digital format */
 	0x04, 0x00,
 	0x05, 0x80, /* or 0x00 for PAL */
 	0x06, 0x40, /* second internal current reference */
 	0x07, 0x02, /* window */
 	0x08, 0x14, /* window */
 	0x09, 0xf0, /* window */
 	0x0a, 0x81, /* window */
 	0x0b, 0xd0, /* window */
 	0x0c, 0x8c,
 	0x0d, 0x00, /* scaling */
 	0x0e, 0x11, /* scaling */
 	0x0f, 0x00, /* scaling */
 	0x10, 0x00, /* brightness */
 	0x11, 0x60, /* contrast */
 	0x12, 0x01, /* sharpness */
 	0x13, 0x7f, /* U gain */
 	0x14, 0x5a, /* V gain */
 	0x15, 0x00, /* hue */
 	0x16, 0xc3, /* sharpness */
 	0x18, 0x00,
 	0x19, 0x58, /* vbi */
 	0x1a, 0x80,
 	0x1c, 0x0f, /* video norm */
 	0x1d, 0x7f, /* video norm */
 	0x20, 0xa0, /* clamping gain (working 0x50) */
 	0x21, 0x22,
 	0x22, 0xf0,
 	0x23, 0xfe,
 	0x24, 0x3c,
 	0x25, 0x38,
 	0x26, 0x44,
 	0x27, 0x20,
 	0x28, 0x00,
 	0x29, 0x15,
 	0x2a, 0xa0,
 	0x2b, 0x44,
 	0x2c, 0x37,
 	0x2d, 0x00,
 	0x2e, 0xa5, /* burst PLL control (working: a9) */
 	0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */
 	0x31, 0x00,
 	0x33, 0x22,
 	0x34, 0x11,
 	0x35, 0x35,
 	0x3b, 0x05,
 	0x06, 0xc0, /* reset device */
 	0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
 };

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

 	return i2c_smbus_write_byte_data(client, reg, value);
 }

 static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
 {
 	int i;

 	for (i = 0; regs[i] != 0x00; i += 2)
 		if (write_reg(sd, regs[i], regs[i + 1]) < 0)
 			return -1;
 	return 0;
 }

 static int tw9903_s_video_routing(struct v4l2_subdev *sd, u32 input,
 				      u32 output, u32 config)
 {
 	write_reg(sd, 0x02, 0x40 | (input << 1));
 	return 0;
 }

 static int tw9903_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
 {
 	struct tw9903 *dec = to_state(sd);
 	bool is_60hz = norm & V4L2_STD_525_60;
 	static const u8 config_60hz[] = {
 		0x05, 0x80,
 		0x07, 0x02,
 		0x08, 0x14,
 		0x09, 0xf0,
 		0,    0,
 	};
 	static const u8 config_50hz[] = {
 		0x05, 0x00,
 		0x07, 0x12,
 		0x08, 0x18,
 		0x09, 0x20,
 		0,    0,
 	};

 	write_regs(sd, is_60hz ? config_60hz : config_50hz);
 	dec->norm = norm;
 	return 0;
 }


 static int tw9903_s_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct tw9903 *dec = container_of(ctrl->handler, struct tw9903, hdl);
 	struct v4l2_subdev *sd = &dec->sd;

 	switch (ctrl->id) {
 	case V4L2_CID_BRIGHTNESS:
 		write_reg(sd, 0x10, ctrl->val);
 		break;
 	case V4L2_CID_CONTRAST:
 		write_reg(sd, 0x11, ctrl->val);
 		break;
 	case V4L2_CID_HUE:
 		write_reg(sd, 0x15, ctrl->val);
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static int tw9903_log_status(struct v4l2_subdev *sd)
 {
 	struct tw9903 *dec = to_state(sd);
 	bool is_60hz = dec->norm & V4L2_STD_525_60;

 	v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
 	v4l2_ctrl_subdev_log_status(sd);
 	return 0;
 }

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

 static const struct v4l2_ctrl_ops tw9903_ctrl_ops = {
 	.s_ctrl = tw9903_s_ctrl,
 };

 static const struct v4l2_subdev_core_ops tw9903_core_ops = {
 	.log_status = tw9903_log_status,
 };

 static const struct v4l2_subdev_video_ops tw9903_video_ops = {
 	.s_std = tw9903_s_std,
 	.s_routing = tw9903_s_video_routing,
 };

 static const struct v4l2_subdev_ops tw9903_ops = {
 	.core = &tw9903_core_ops,
 	.video = &tw9903_video_ops,
 };

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

 static int tw9903_probe(struct i2c_client *client,
 			     const struct i2c_device_id *id)
 {
 	struct tw9903 *dec;
 	struct v4l2_subdev *sd;
 	struct v4l2_ctrl_handler *hdl;

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

 	v4l_info(client, "chip found @ 0x%02x (%s)\n",
 			client->addr << 1, client->adapter->name);

 	dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
 	if (dec == NULL)
 		return -ENOMEM;
 	sd = &dec->sd;
 	v4l2_i2c_subdev_init(sd, client, &tw9903_ops);
 	hdl = &dec->hdl;
 	v4l2_ctrl_handler_init(hdl, 4);
 	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 		V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
 	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 		V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
 	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 		V4L2_CID_HUE, -128, 127, 1, 0);
 	sd->ctrl_handler = hdl;
 	if (hdl->error) {
 		int err = hdl->error;

 		v4l2_ctrl_handler_free(hdl);
 		return err;
 	}

 	/* Initialize tw9903 */
 	dec->norm = V4L2_STD_NTSC;

 	if (write_regs(sd, initial_registers) < 0) {
 		v4l2_err(client, "error initializing TW9903\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int tw9903_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);

 	v4l2_device_unregister_subdev(sd);
 	v4l2_ctrl_handler_free(&to_state(sd)->hdl);
 	return 0;
 }

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

 static const struct i2c_device_id tw9903_id[] = {
 	{ "tw9903", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tw9903_id);

 static struct i2c_driver tw9903_driver = {
 	.driver = {
 		.name	= "tw9903",
 	},
 	.probe = tw9903_probe,
 	.remove = tw9903_remove,
 	.id_table = tw9903_id,
 };
 module_i2c_driver(tw9903_driver);
	/*
	* Copyright (C) 2005-2006 Micronas USA Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License (Version 2) as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

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

	MODULE_DESCRIPTION("TW9903 I2C subdev driver");
	MODULE_LICENSE("GPL v2");

	/*
	* This driver is based on the wis-tw9903.c source that was in
	* drivers/staging/media/go7007. That source had commented out code for
	* saturation and scaling (neither seemed to work). If anyone ever gets
	* hardware to test this driver, then that code might be useful to look at.
	* You need to get the kernel sources of, say, kernel 3.8 where that
	* wis-tw9903 driver is still present.
	*/

	struct tw9903 {
	struct v4l2_subdev sd;
	struct v4l2_ctrl_handler hdl;
	v4l2_std_id norm;
	};

	static inline struct tw9903 to_state(struct v4l2_subdev sd)
	{
	return container_of(sd, struct tw9903, sd);
	}

	static const u8 initial_registers[] = {
	0x02, 0x44, /* input 1, composite */
	0x03, 0x92, /* correct digital format */
	0x04, 0x00,
	0x05, 0x80, /* or 0x00 for PAL */
	0x06, 0x40, /* second internal current reference */
	0x07, 0x02, /* window */
	0x08, 0x14, /* window */
	0x09, 0xf0, /* window */
	0x0a, 0x81, /* window */
	0x0b, 0xd0, /* window */
	0x0c, 0x8c,
	0x0d, 0x00, /* scaling */
	0x0e, 0x11, /* scaling */
	0x0f, 0x00, /* scaling */
	0x10, 0x00, /* brightness */
	0x11, 0x60, /* contrast */
	0x12, 0x01, /* sharpness */
	0x13, 0x7f, /* U gain */
	0x14, 0x5a, /* V gain */
	0x15, 0x00, /* hue */
	0x16, 0xc3, /* sharpness */
	0x18, 0x00,
	0x19, 0x58, /* vbi */
	0x1a, 0x80,
	0x1c, 0x0f, /* video norm */
	0x1d, 0x7f, /* video norm */
	0x20, 0xa0, /* clamping gain (working 0x50) */
	0x21, 0x22,
	0x22, 0xf0,
	0x23, 0xfe,
	0x24, 0x3c,
	0x25, 0x38,
	0x26, 0x44,
	0x27, 0x20,
	0x28, 0x00,
	0x29, 0x15,
	0x2a, 0xa0,
	0x2b, 0x44,
	0x2c, 0x37,
	0x2d, 0x00,
	0x2e, 0xa5, /* burst PLL control (working: a9) */
	0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */
	0x31, 0x00,
	0x33, 0x22,
	0x34, 0x11,
	0x35, 0x35,
	0x3b, 0x05,
	0x06, 0xc0, /* reset device */
	0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
	};

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

	return i2c_smbus_write_byte_data(client, reg, value);
	}

	static int write_regs(struct v4l2_subdev sd, const u8 regs)
	{
	int i;

	for (i = 0; regs[i] != 0x00; i += 2)
	if (write_reg(sd, regs[i], regs[i + 1]) < 0)
	return -1;
	return 0;
	}

	static int tw9903_s_video_routing(struct v4l2_subdev *sd, u32 input,
	u32 output, u32 config)
	{
	write_reg(sd, 0x02, 0x40 \| (input << 1));
	return 0;
	}

	static int tw9903_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
	{
	struct tw9903 *dec = to_state(sd);
	bool is_60hz = norm & V4L2_STD_525_60;
	static const u8 config_60hz[] = {
	0x05, 0x80,
	0x07, 0x02,
	0x08, 0x14,
	0x09, 0xf0,
	0, 0,
	};
	static const u8 config_50hz[] = {
	0x05, 0x00,
	0x07, 0x12,
	0x08, 0x18,
	0x09, 0x20,
	0, 0,
	};

	write_regs(sd, is_60hz ? config_60hz : config_50hz);
	dec->norm = norm;
	return 0;
	}


	static int tw9903_s_ctrl(struct v4l2_ctrl *ctrl)
	{
	struct tw9903 *dec = container_of(ctrl->handler, struct tw9903, hdl);
	struct v4l2_subdev *sd = &dec->sd;

	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
	write_reg(sd, 0x10, ctrl->val);
	break;
	case V4L2_CID_CONTRAST:
	write_reg(sd, 0x11, ctrl->val);
	break;
	case V4L2_CID_HUE:
	write_reg(sd, 0x15, ctrl->val);
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static int tw9903_log_status(struct v4l2_subdev *sd)
	{
	struct tw9903 *dec = to_state(sd);
	bool is_60hz = dec->norm & V4L2_STD_525_60;

	v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
	v4l2_ctrl_subdev_log_status(sd);
	return 0;
	}

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

	static const struct v4l2_ctrl_ops tw9903_ctrl_ops = {
	.s_ctrl = tw9903_s_ctrl,
	};

	static const struct v4l2_subdev_core_ops tw9903_core_ops = {
	.log_status = tw9903_log_status,
	};

	static const struct v4l2_subdev_video_ops tw9903_video_ops = {
	.s_std = tw9903_s_std,
	.s_routing = tw9903_s_video_routing,
	};

	static const struct v4l2_subdev_ops tw9903_ops = {
	.core = &tw9903_core_ops,
	.video = &tw9903_video_ops,
	};

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

	static int tw9903_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tw9903 *dec;
	struct v4l2_subdev *sd;
	struct v4l2_ctrl_handler *hdl;

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

	v4l_info(client, "chip found @ 0x%02x (%s)\n",
	client->addr << 1, client->adapter->name);

	dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
	if (dec == NULL)
	return -ENOMEM;
	sd = &dec->sd;
	v4l2_i2c_subdev_init(sd, client, &tw9903_ops);
	hdl = &dec->hdl;
	v4l2_ctrl_handler_init(hdl, 4);
	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
	V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
	V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
	V4L2_CID_HUE, -128, 127, 1, 0);
	sd->ctrl_handler = hdl;
	if (hdl->error) {
	int err = hdl->error;

	v4l2_ctrl_handler_free(hdl);
	return err;
	}

	/* Initialize tw9903 */
	dec->norm = V4L2_STD_NTSC;

	if (write_regs(sd, initial_registers) < 0) {
	v4l2_err(client, "error initializing TW9903\n");
	return -EINVAL;
	}

	return 0;
	}

	static int tw9903_remove(struct i2c_client *client)
	{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	v4l2_ctrl_handler_free(&to_state(sd)->hdl);
	return 0;
	}

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

	static const struct i2c_device_id tw9903_id[] = {
	{ "tw9903", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, tw9903_id);

	static struct i2c_driver tw9903_driver = {
	.driver = {
	.name = "tw9903",
	},
	.probe = tw9903_probe,
	.remove = tw9903_remove,
	.id_table = tw9903_id,
	};
	module_i2c_driver(tw9903_driver);