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linux/drivers/media/i2c/tw2804.c
Hans Verkuil 12be52a9e0 [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: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2013-03-24 12:28:48 -03:00

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/*
* 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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