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Commit a000e9a0 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
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[media] tw9906: add Techwell tw9906 video decoder 



Taken from the 0.9.8-5 version of the out-of-tree wis-go7007 driver.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 0a6ecbb4

drivers/media/i2c/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -320,6 +320,16 @@ config VIDEO_TW9903 
	  To compile this driver as a module, choose M here: the

	  module will be called tw9903.



config VIDEO_TW9906

	tristate "Techwell TW9906 video decoder"

	depends on VIDEO_V4L2 && I2C

	---help---

	  Support for the Techwell tw9906 enhanced multi-standard comb filter

	  video decoder with YCbCr input support.



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

	  module will be called tw9906.



config VIDEO_VPX3220

	tristate "vpx3220a, vpx3216b & vpx3214c video decoders"

	depends on VIDEO_V4L2 && I2C

drivers/media/i2c/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 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_TW9906) += tw9906.o

obj-$(CONFIG_VIDEO_CS5345) += cs5345.o

obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o

obj-$(CONFIG_VIDEO_M52790) += m52790.o

drivers/media/i2c/tw9906.c

0 → 100644
+241 −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/version.h>

#include <linux/i2c.h>

#include <linux/videodev2.h>

#include <linux/ioctl.h>

#include <linux/slab.h>

#include <media/v4l2-device.h>

#include <media/v4l2-ctrls.h>



MODULE_DESCRIPTION("TW9906 I2C subdev driver");

MODULE_LICENSE("GPL v2");



struct tw9906 {

	struct v4l2_subdev sd;

	struct v4l2_ctrl_handler hdl;

	v4l2_std_id norm;

};



static inline struct tw9906 *to_state(struct v4l2_subdev *sd)

{

	return container_of(sd, struct tw9906, sd);

}



static const u8 initial_registers[] = {

	0x02, 0x40, /* input 0, composite */

	0x03, 0xa2, /* correct digital format */

	0x05, 0x81, /* or 0x01 for PAL */

	0x07, 0x02, /* window */

	0x08, 0x14, /* window */

	0x09, 0xf0, /* window */

	0x0a, 0x10, /* window */

	0x0b, 0xd0, /* window */

	0x0d, 0x00, /* scaling */

	0x0e, 0x11, /* scaling */

	0x0f, 0x00, /* scaling */

	0x10, 0x00, /* brightness */

	0x11, 0x60, /* contrast */

	0x12, 0x11, /* sharpness */

	0x13, 0x7e, /* U gain */

	0x14, 0x7e, /* V gain */

	0x15, 0x00, /* hue */

	0x19, 0x57, /* vbi */

	0x1a, 0x0f,

	0x1b, 0x40,

	0x29, 0x03,

	0x55, 0x00,

	0x6b, 0x26,

	0x6c, 0x36,

	0x6d, 0xf0,

	0x6e, 0x41,

	0x6f, 0x13,

	0xad, 0x70,

	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 tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,

				      u32 output, u32 config)

{

	write_reg(sd, 0x02, 0x40 | (input << 1));

	return 0;

}



static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)

{

	struct tw9906 *dec = to_state(sd);

	bool is_60hz = norm & V4L2_STD_525_60;

	u8 regs[] = {

		0x05, is_60hz ? 0x81 : 0x01,

		0x07, is_60hz ? 0x02 : 0x12,

		0x08, is_60hz ? 0x14 : 0x18,

		0x09, is_60hz ? 0xf0 : 0x20,

		0,    0,

	};



	write_regs(sd, regs);

	dec->norm = norm;

	return 0;

}



static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)

{

	struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, 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 tw9906_log_status(struct v4l2_subdev *sd)

{

	struct tw9906 *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 tw9906_ctrl_ops = {

	.s_ctrl = tw9906_s_ctrl,

};



static const struct v4l2_subdev_core_ops tw9906_core_ops = {

	.log_status = tw9906_log_status,

	.s_std = tw9906_s_std,

};



static const struct v4l2_subdev_video_ops tw9906_video_ops = {

	.s_routing = tw9906_s_video_routing,

};



static const struct v4l2_subdev_ops tw9906_ops = {

	.core = &tw9906_core_ops,

	.video = &tw9906_video_ops,

};



static int tw9906_probe(struct i2c_client *client,

			     const struct i2c_device_id *id)

{

	struct tw9906 *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 = kzalloc(sizeof(struct tw9906), GFP_KERNEL);

	if (dec == NULL)

		return -ENOMEM;

	sd = &dec->sd;

	v4l2_i2c_subdev_init(sd, client, &tw9906_ops);

	hdl = &dec->hdl;

	v4l2_ctrl_handler_init(hdl, 4);

	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,

		V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);

	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,

		V4L2_CID_CONTRAST, 0, 255, 1, 0x60);

	v4l2_ctrl_new_std(hdl, &tw9906_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);

		kfree(dec);

		return err;

	}



	/* Initialize tw9906 */

	dec->norm = V4L2_STD_NTSC;



	if (write_regs(sd, initial_registers) < 0) {

		v4l2_err(client, "error initializing TW9906\n");

		kfree(dec);

		return -EINVAL;

	}



	return 0;

}



static int tw9906_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);

	kfree(to_state(sd));

	return 0;

}



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



static const struct i2c_device_id tw9906_id[] = {

	{ "tw9906", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, tw9906_id);



static struct i2c_driver tw9906_driver = {

	.driver = {

		.owner	= THIS_MODULE,

		.name	= "tw9906",

	},

	.probe = tw9906_probe,

	.remove = tw9906_remove,

	.id_table = tw9906_id,

};

module_i2c_driver(tw9906_driver);