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linux-sg2042/drivers/media/i2c/bt856.c

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/*
* bt856 - BT856A Digital Video Encoder (Rockwell Part)
*
* Copyright (C) 1999 Mike Bernson <mike@mlb.org>
* Copyright (C) 1998 Dave Perks <dperks@ibm.net>
*
* Modifications for LML33/DC10plus unified driver
* Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
*
* This code was modify/ported from the saa7111 driver written
* by Dave Perks.
*
* Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
* - moved over to linux>=2.4.x i2c protocol (9/9/2002)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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/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("Brooktree-856A video encoder driver");
MODULE_AUTHOR("Mike Bernson & Dave Perks");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
/* ----------------------------------------------------------------------- */
#define BT856_REG_OFFSET 0xDA
#define BT856_NR_REG 6
struct bt856 {
struct v4l2_subdev sd;
unsigned char reg[BT856_NR_REG];
v4l2_std_id norm;
};
static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
{
return container_of(sd, struct bt856, sd);
}
/* ----------------------------------------------------------------------- */
static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
{
struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
encoder->reg[reg - BT856_REG_OFFSET] = value;
return i2c_smbus_write_byte_data(client, reg, value);
}
static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
{
return bt856_write(encoder, reg,
(encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
(value ? (1 << bit) : 0));
}
static void bt856_dump(struct bt856 *encoder)
{
int i;
v4l2_info(&encoder->sd, "register dump:\n");
for (i = 0; i < BT856_NR_REG; i += 2)
printk(KERN_CONT " %02x", encoder->reg[i]);
printk(KERN_CONT "\n");
}
/* ----------------------------------------------------------------------- */
static int bt856_init(struct v4l2_subdev *sd, u32 arg)
{
struct bt856 *encoder = to_bt856(sd);
/* This is just for testing!!! */
v4l2_dbg(1, debug, sd, "init\n");
bt856_write(encoder, 0xdc, 0x18);
bt856_write(encoder, 0xda, 0);
bt856_write(encoder, 0xde, 0);
bt856_setbit(encoder, 0xdc, 3, 1);
/*bt856_setbit(encoder, 0xdc, 6, 0);*/
bt856_setbit(encoder, 0xdc, 4, 1);
if (encoder->norm & V4L2_STD_NTSC)
bt856_setbit(encoder, 0xdc, 2, 0);
else
bt856_setbit(encoder, 0xdc, 2, 1);
bt856_setbit(encoder, 0xdc, 1, 1);
bt856_setbit(encoder, 0xde, 4, 0);
bt856_setbit(encoder, 0xde, 3, 1);
if (debug != 0)
bt856_dump(encoder);
return 0;
}
static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
{
struct bt856 *encoder = to_bt856(sd);
v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
if (std & V4L2_STD_NTSC) {
bt856_setbit(encoder, 0xdc, 2, 0);
} else if (std & V4L2_STD_PAL) {
bt856_setbit(encoder, 0xdc, 2, 1);
bt856_setbit(encoder, 0xda, 0, 0);
/*bt856_setbit(encoder, 0xda, 0, 1);*/
} else {
return -EINVAL;
}
encoder->norm = std;
if (debug != 0)
bt856_dump(encoder);
return 0;
}
static int bt856_s_routing(struct v4l2_subdev *sd,
u32 input, u32 output, u32 config)
{
struct bt856 *encoder = to_bt856(sd);
v4l2_dbg(1, debug, sd, "set input %d\n", input);
/* We only have video bus.
* input= 0: input is from bt819
* input= 1: input is from ZR36060 */
switch (input) {
case 0:
bt856_setbit(encoder, 0xde, 4, 0);
bt856_setbit(encoder, 0xde, 3, 1);
bt856_setbit(encoder, 0xdc, 3, 1);
bt856_setbit(encoder, 0xdc, 6, 0);
break;
case 1:
bt856_setbit(encoder, 0xde, 4, 0);
bt856_setbit(encoder, 0xde, 3, 1);
bt856_setbit(encoder, 0xdc, 3, 1);
bt856_setbit(encoder, 0xdc, 6, 1);
break;
case 2: /* Color bar */
bt856_setbit(encoder, 0xdc, 3, 0);
bt856_setbit(encoder, 0xde, 4, 1);
break;
default:
return -EINVAL;
}
if (debug != 0)
bt856_dump(encoder);
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops bt856_core_ops = {
.init = bt856_init,
};
static const struct v4l2_subdev_video_ops bt856_video_ops = {
.s_std_output = bt856_s_std_output,
.s_routing = bt856_s_routing,
};
static const struct v4l2_subdev_ops bt856_ops = {
.core = &bt856_core_ops,
.video = &bt856_video_ops,
};
/* ----------------------------------------------------------------------- */
static int bt856_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bt856 *encoder;
struct v4l2_subdev *sd;
/* 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, &bt856_ops);
encoder->norm = V4L2_STD_NTSC;
bt856_write(encoder, 0xdc, 0x18);
bt856_write(encoder, 0xda, 0);
bt856_write(encoder, 0xde, 0);
bt856_setbit(encoder, 0xdc, 3, 1);
/*bt856_setbit(encoder, 0xdc, 6, 0);*/
bt856_setbit(encoder, 0xdc, 4, 1);
if (encoder->norm & V4L2_STD_NTSC)
bt856_setbit(encoder, 0xdc, 2, 0);
else
bt856_setbit(encoder, 0xdc, 2, 1);
bt856_setbit(encoder, 0xdc, 1, 1);
bt856_setbit(encoder, 0xde, 4, 0);
bt856_setbit(encoder, 0xde, 3, 1);
if (debug != 0)
bt856_dump(encoder);
return 0;
}
static int bt856_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 bt856_id[] = {
{ "bt856", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, bt856_id);
static struct i2c_driver bt856_driver = {
.driver = {
.name = "bt856",
},
.probe = bt856_probe,
.remove = bt856_remove,
.id_table = bt856_id,
};
module_i2c_driver(bt856_driver);
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