Commit 12be52a9 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

[media] tw2804: add support for the Techwell tw2804 



This is based on the wis-tw2804.c driver that's part of the go7007 driver.
It has been converted to a v4l subdev driver by Volokh Konstantin, and I
made additional cleanups.
Based on work by: Volokh Konstantin <volokh84@gmail.com>

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 0890ec19

drivers/media/i2c/Kconfig

+10 −1
Original line number Diff line number Diff line
@@ -301,11 +301,20 @@ config VIDEO_TVP7002 
	  To compile this driver as a module, choose M here: the

	  module will be called tvp7002.



config VIDEO_TW2804

	tristate "Techwell TW2804 multiple video decoder"

	depends on VIDEO_V4L2 && I2C

	---help---

	  Support for the Techwell tw2804 multiple video decoder.



	  To compile this driver as a module, choose M here: the

	  module will be called tw2804.



config VIDEO_TW9903

	tristate "Techwell TW9903 video decoder"

	depends on VIDEO_V4L2 && I2C

	---help---

	  Support for the Techwell 9903 multi-standard video decoder

	  Support for the Techwell tw9903 multi-standard video decoder

	  with high quality down scaler.



	  To compile this driver as a module, choose M here: the

drivers/media/i2c/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ obj-$(CONFIG_VIDEO_THS7303) += ths7303.o 
obj-$(CONFIG_VIDEO_TVP5150) += tvp5150.o

obj-$(CONFIG_VIDEO_TVP514X) += tvp514x.o

obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o

obj-$(CONFIG_VIDEO_TW2804) += tw2804.o

obj-$(CONFIG_VIDEO_TW9903) += tw9903.o

obj-$(CONFIG_VIDEO_CS5345) += cs5345.o

obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o

drivers/media/i2c/tw2804.c

0 → 100644
+467 −0
Original line number Diff line number Diff line 
/*

 * 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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software Foundation,

 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.

 */



#include <linux/module.h>

#include <linux/init.h>

#include <linux/i2c.h>

#include <linux/videodev2.h>

#include <linux/ioctl.h>

#include <linux/slab.h>

#include <media/v4l2-subdev.h>

#include <media/v4l2-device.h>

#include <media/v4l2-chip-ident.h>

#include <media/v4l2-ctrls.h>



#define TW2804_REG_AUTOGAIN		0x02

#define TW2804_REG_HUE			0x0f

#define TW2804_REG_SATURATION		0x10

#define TW2804_REG_CONTRAST		0x11

#define TW2804_REG_BRIGHTNESS		0x12

#define TW2804_REG_COLOR_KILLER		0x14

#define TW2804_REG_GAIN			0x3c

#define TW2804_REG_CHROMA_GAIN		0x3d

#define TW2804_REG_BLUE_BALANCE		0x3e

#define TW2804_REG_RED_BALANCE		0x3f



struct tw2804 {

	struct v4l2_subdev sd;

	struct v4l2_ctrl_handler hdl;

	u8 channel:2;

	u8 input:1;

	int norm;

};



static const u8 global_registers[] = {

	0x39, 0x00,

	0x3a, 0xff,

	0x3b, 0x84,

	0x3c, 0x80,

	0x3d, 0x80,

	0x3e, 0x82,

	0x3f, 0x82,

	0xff, 0xff, /* Terminator (reg 0xff does not exist) */

};



static const u8 channel_registers[] = {

	0x01, 0xc4,

	0x02, 0xa5,

	0x03, 0x20,

	0x04, 0xd0,

	0x05, 0x20,

	0x06, 0xd0,

	0x07, 0x88,

	0x08, 0x20,

	0x09, 0x07,

	0x0a, 0xf0,

	0x0b, 0x07,

	0x0c, 0xf0,

	0x0d, 0x40,

	0x0e, 0xd2,

	0x0f, 0x80,

	0x10, 0x80,

	0x11, 0x80,

	0x12, 0x80,

	0x13, 0x1f,

	0x14, 0x00,

	0x15, 0x00,

	0x16, 0x00,

	0x17, 0x00,

	0x18, 0xff,

	0x19, 0xff,

	0x1a, 0xff,

	0x1b, 0xff,

	0x1c, 0xff,

	0x1d, 0xff,

	0x1e, 0xff,

	0x1f, 0xff,

	0x20, 0x07,

	0x21, 0x07,

	0x22, 0x00,

	0x23, 0x91,

	0x24, 0x51,

	0x25, 0x03,

	0x26, 0x00,

	0x27, 0x00,

	0x28, 0x00,

	0x29, 0x00,

	0x2a, 0x00,

	0x2b, 0x00,

	0x2c, 0x00,

	0x2d, 0x00,

	0x2e, 0x00,

	0x2f, 0x00,

	0x30, 0x00,

	0x31, 0x00,

	0x32, 0x00,

	0x33, 0x00,

	0x34, 0x00,

	0x35, 0x00,

	0x36, 0x00,

	0x37, 0x00,

	0xff, 0xff, /* Terminator (reg 0xff does not exist) */

};



static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)

{

	return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);

}



static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel)

{

	int ret;

	int i;



	for (i = 0; regs[i] != 0xff; i += 2) {

		ret = i2c_smbus_write_byte_data(client,

				regs[i] | (channel << 6), regs[i + 1]);

		if (ret < 0)

			return ret;

	}

	return 0;

}



static int read_reg(struct i2c_client *client, u8 reg, u8 channel)

{

	return i2c_smbus_read_byte_data(client, (reg) | (channel << 6));

}



static inline struct tw2804 *to_state(struct v4l2_subdev *sd)

{

	return container_of(sd, struct tw2804, sd);

}



static inline struct tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl)

{

	return container_of(ctrl->handler, struct tw2804, hdl);

}



static int tw2804_log_status(struct v4l2_subdev *sd)

{

	struct tw2804 *state = to_state(sd);



	v4l2_info(sd, "Standard: %s\n",

			state->norm & V4L2_STD_525_60 ? "60 Hz" : "50 Hz");

	v4l2_info(sd, "Channel: %d\n", state->channel);

	v4l2_info(sd, "Input: %d\n", state->input);

	return v4l2_ctrl_subdev_log_status(sd);

}



/*

 * These volatile controls are needed because all four channels share

 * these controls. So a change made to them through one channel would

 * require another channel to be updated.

 *

 * Normally this would have been done in a different way, but since the one

 * board that uses this driver sees this single chip as if it was on four

 * different i2c adapters (each adapter belonging to a separate instance of

 * the same USB driver) there is no reliable method that I have found to let

 * the instances know about each other.

 *

 * So implementing these global registers as volatile is the best we can do.

 */

static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl)

{

	struct tw2804 *state = to_state_from_ctrl(ctrl);

	struct i2c_client *client = v4l2_get_subdevdata(&state->sd);



	switch (ctrl->id) {

	case V4L2_CID_GAIN:

		ctrl->val = read_reg(client, TW2804_REG_GAIN, 0);

		return 0;



	case V4L2_CID_CHROMA_GAIN:

		ctrl->val = read_reg(client, TW2804_REG_CHROMA_GAIN, 0);

		return 0;



	case V4L2_CID_BLUE_BALANCE:

		ctrl->val = read_reg(client, TW2804_REG_BLUE_BALANCE, 0);

		return 0;



	case V4L2_CID_RED_BALANCE:

		ctrl->val = read_reg(client, TW2804_REG_RED_BALANCE, 0);

		return 0;

	}

	return 0;

}



static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl)

{

	struct tw2804 *state = to_state_from_ctrl(ctrl);

	struct i2c_client *client = v4l2_get_subdevdata(&state->sd);

	int addr;

	int reg;



	switch (ctrl->id) {

	case V4L2_CID_AUTOGAIN:

		addr = TW2804_REG_AUTOGAIN;

		reg = read_reg(client, addr, state->channel);

		if (reg < 0)

			return reg;

		if (ctrl->val == 0)

			reg &= ~(1 << 7);

		else

			reg |= 1 << 7;

		return write_reg(client, addr, reg, state->channel);



	case V4L2_CID_COLOR_KILLER:

		addr = TW2804_REG_COLOR_KILLER;

		reg = read_reg(client, addr, state->channel);

		if (reg < 0)

			return reg;

		reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03);

		return write_reg(client, addr, reg, state->channel);



	case V4L2_CID_GAIN:

		return write_reg(client, TW2804_REG_GAIN, ctrl->val, 0);



	case V4L2_CID_CHROMA_GAIN:

		return write_reg(client, TW2804_REG_CHROMA_GAIN, ctrl->val, 0);



	case V4L2_CID_BLUE_BALANCE:

		return write_reg(client, TW2804_REG_BLUE_BALANCE, ctrl->val, 0);



	case V4L2_CID_RED_BALANCE:

		return write_reg(client, TW2804_REG_RED_BALANCE, ctrl->val, 0);



	case V4L2_CID_BRIGHTNESS:

		return write_reg(client, TW2804_REG_BRIGHTNESS,

				ctrl->val, state->channel);



	case V4L2_CID_CONTRAST:

		return write_reg(client, TW2804_REG_CONTRAST,

				ctrl->val, state->channel);



	case V4L2_CID_SATURATION:

		return write_reg(client, TW2804_REG_SATURATION,

				ctrl->val, state->channel);



	case V4L2_CID_HUE:

		return write_reg(client, TW2804_REG_HUE,

				ctrl->val, state->channel);



	default:

		break;

	}

	return -EINVAL;

}



static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)

{

	struct tw2804 *dec = to_state(sd);

	struct i2c_client *client = v4l2_get_subdevdata(sd);

	bool is_60hz = norm & V4L2_STD_525_60;

	u8 regs[] = {

		0x01, is_60hz ? 0xc4 : 0x84,

		0x09, is_60hz ? 0x07 : 0x04,

		0x0a, is_60hz ? 0xf0 : 0x20,

		0x0b, is_60hz ? 0x07 : 0x04,

		0x0c, is_60hz ? 0xf0 : 0x20,

		0x0d, is_60hz ? 0x40 : 0x4a,

		0x16, is_60hz ? 0x00 : 0x40,

		0x17, is_60hz ? 0x00 : 0x40,

		0x20, is_60hz ? 0x07 : 0x0f,

		0x21, is_60hz ? 0x07 : 0x0f,

		0xff, 0xff,

	};



	write_regs(client, regs, dec->channel);

	dec->norm = norm;

	return 0;

}



static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,

	u32 config)

{

	struct tw2804 *dec = to_state(sd);

	struct i2c_client *client = v4l2_get_subdevdata(sd);

	int reg;



	if (config && config - 1 != dec->channel) {

		if (config > 4) {

			dev_err(&client->dev,

				"channel %d is not between 1 and 4!\n", config);

			return -EINVAL;

		}

		dec->channel = config - 1;

		dev_dbg(&client->dev, "initializing TW2804 channel %d\n",

			dec->channel);

		if (dec->channel == 0 &&

				write_regs(client, global_registers, 0) < 0) {

			dev_err(&client->dev,

				"error initializing TW2804 global registers\n");

			return -EIO;

		}

		if (write_regs(client, channel_registers, dec->channel) < 0) {

			dev_err(&client->dev,

				"error initializing TW2804 channel %d\n",

				dec->channel);

			return -EIO;

		}

	}



	if (input > 1)

		return -EINVAL;



	if (input == dec->input)

		return 0;



	reg = read_reg(client, 0x22, dec->channel);



	if (reg >= 0) {

		if (input == 0)

			reg &= ~(1 << 2);

		else

			reg |= 1 << 2;

		reg = write_reg(client, 0x22, reg, dec->channel);

	}



	if (reg >= 0)

		dec->input = input;

	else

		return reg;

	return 0;

}



static int tw2804_s_stream(struct v4l2_subdev *sd, int enable)

{

	struct tw2804 *dec = to_state(sd);

	struct i2c_client *client = v4l2_get_subdevdata(sd);

	u32 reg = read_reg(client, 0x78, 0);



	if (enable == 1)

		write_reg(client, 0x78, reg & ~(1 << dec->channel), 0);

	else

		write_reg(client, 0x78, reg | (1 << dec->channel), 0);



	return 0;

}



static const struct v4l2_ctrl_ops tw2804_ctrl_ops = {

	.g_volatile_ctrl = tw2804_g_volatile_ctrl,

	.s_ctrl = tw2804_s_ctrl,

};



static const struct v4l2_subdev_video_ops tw2804_video_ops = {

	.s_routing = tw2804_s_video_routing,

	.s_stream = tw2804_s_stream,

};



static const struct v4l2_subdev_core_ops tw2804_core_ops = {

	.log_status = tw2804_log_status,

	.s_std = tw2804_s_std,

};



static const struct v4l2_subdev_ops tw2804_ops = {

	.core = &tw2804_core_ops,

	.video = &tw2804_video_ops,

};



static int tw2804_probe(struct i2c_client *client,

			    const struct i2c_device_id *id)

{

	struct i2c_adapter *adapter = client->adapter;

	struct tw2804 *state;

	struct v4l2_subdev *sd;

	struct v4l2_ctrl *ctrl;

	int err;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -ENODEV;



	state = kzalloc(sizeof(struct tw2804), GFP_KERNEL);



	if (state == NULL)

		return -ENOMEM;

	sd = &state->sd;

	v4l2_i2c_subdev_init(sd, client, &tw2804_ops);

	state->channel = -1;

	state->norm = V4L2_STD_NTSC;



	v4l2_ctrl_handler_init(&state->hdl, 10);

	v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);

	v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_CONTRAST, 0, 255, 1, 128);

	v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_SATURATION, 0, 255, 1, 128);

	v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_HUE, 0, 255, 1, 128);

	v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);

	v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_AUTOGAIN, 0, 1, 1, 0);

	ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_GAIN, 0, 255, 1, 128);

	if (ctrl)

		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;

	ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_CHROMA_GAIN, 0, 255, 1, 128);

	if (ctrl)

		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;

	ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_BLUE_BALANCE, 0, 255, 1, 122);

	if (ctrl)

		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;

	ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,

				V4L2_CID_RED_BALANCE, 0, 255, 1, 122);

	if (ctrl)

		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;

	sd->ctrl_handler = &state->hdl;

	err = state->hdl.error;

	if (err) {

		v4l2_ctrl_handler_free(&state->hdl);

		kfree(state);

		return err;

	}



	v4l_info(client, "chip found @ 0x%02x (%s)\n",

			client->addr << 1, client->adapter->name);



	return 0;

}



static int tw2804_remove(struct i2c_client *client)

{

	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	struct tw2804 *state = to_state(sd);



	v4l2_device_unregister_subdev(sd);

	v4l2_ctrl_handler_free(&state->hdl);

	kfree(state);

	return 0;

}



static const struct i2c_device_id tw2804_id[] = {

	{ "tw2804", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, tw2804_id);



static struct i2c_driver tw2804_driver = {

	.driver = {

		.name	= "tw2804",

	},

	.probe		= tw2804_probe,

	.remove		= tw2804_remove,

	.id_table	= tw2804_id,

};



module_i2c_driver(tw2804_driver);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver");

MODULE_AUTHOR("Micronas USA Inc");

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