wis-tw2804.c

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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 "wis-i2c.h"

struct wis_tw2804 {
    int channel;
    int norm;
    int brightness;
    int contrast;
    int saturation;
    int hue;
};

static 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 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, int channel)
{
    return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
}

static int write_regs(struct i2c_client *client, u8 *regs, int channel)
{
    int i;

    for (i = 0; regs[i] != 0xff; i += 2)
        if (i2c_smbus_write_byte_data(client,
                regs[i] | (channel << 6), regs[i + 1]) < 0)
            return -1;
    return 0;
}

static int wis_tw2804_command(struct i2c_client *client,
                unsigned int cmd, void *arg)
{
    struct wis_tw2804 *dec = i2c_get_clientdata(client);

    if (cmd == DECODER_SET_CHANNEL) {
        int *input = arg;

        if (*input < 0 || *input > 3) {
            printk(KERN_ERR "wis-tw2804: channel %d is not "
                    "between 0 and 3!\n", *input);
            return 0;
        }
        dec->channel = *input;
        printk(KERN_DEBUG "wis-tw2804: initializing TW2804 "
                "channel %d\n", dec->channel);
        if (dec->channel == 0 &&
                write_regs(client, global_registers, 0) < 0) {
            printk(KERN_ERR "wis-tw2804: error initializing "
                    "TW2804 global registers\n");
            return 0;
        }
        if (write_regs(client, channel_registers, dec->channel) < 0) {
            printk(KERN_ERR "wis-tw2804: error initializing "
                    "TW2804 channel %d\n", dec->channel);
            return 0;
        }
        return 0;
    }

    if (dec->channel < 0) {
        printk(KERN_DEBUG "wis-tw2804: ignoring command %08x until "
                "channel number is set\n", cmd);
        return 0;
    }

    switch (cmd) {
    case VIDIOC_S_STD:
    {
        v4l2_std_id *input = arg;
        u8 regs[] = {
            0x01, *input & V4L2_STD_NTSC ? 0xc4 : 0x84,
            0x09, *input & V4L2_STD_NTSC ? 0x07 : 0x04,
            0x0a, *input & V4L2_STD_NTSC ? 0xf0 : 0x20,
            0x0b, *input & V4L2_STD_NTSC ? 0x07 : 0x04,
            0x0c, *input & V4L2_STD_NTSC ? 0xf0 : 0x20,
            0x0d, *input & V4L2_STD_NTSC ? 0x40 : 0x4a,
            0x16, *input & V4L2_STD_NTSC ? 0x00 : 0x40,
            0x17, *input & V4L2_STD_NTSC ? 0x00 : 0x40,
            0x20, *input & V4L2_STD_NTSC ? 0x07 : 0x0f,
            0x21, *input & V4L2_STD_NTSC ? 0x07 : 0x0f,
            0xff,   0xff,
        };
        write_regs(client, regs, dec->channel);
        dec->norm = *input;
        break;
    }
    case VIDIOC_QUERYCTRL:
    {
        struct v4l2_queryctrl *ctrl = arg;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Brightness", sizeof(ctrl->name));
            ctrl->minimum = 0;
            ctrl->maximum = 255;
            ctrl->step = 1;
            ctrl->default_value = 128;
            ctrl->flags = 0;
            break;
        case V4L2_CID_CONTRAST:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Contrast", sizeof(ctrl->name));
            ctrl->minimum = 0;
            ctrl->maximum = 255;
            ctrl->step = 1;
            ctrl->default_value = 128;
            ctrl->flags = 0;
            break;
        case V4L2_CID_SATURATION:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Saturation", sizeof(ctrl->name));
            ctrl->minimum = 0;
            ctrl->maximum = 255;
            ctrl->step = 1;
            ctrl->default_value = 128;
            ctrl->flags = 0;
            break;
        case V4L2_CID_HUE:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Hue", sizeof(ctrl->name));
            ctrl->minimum = 0;
            ctrl->maximum = 255;
            ctrl->step = 1;
            ctrl->default_value = 128;
            ctrl->flags = 0;
            break;
        }
        break;
    }
    case VIDIOC_S_CTRL:
    {
        struct v4l2_control *ctrl = arg;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
            if (ctrl->value > 255)
                dec->brightness = 255;
            else if (ctrl->value < 0)
                dec->brightness = 0;
            else
                dec->brightness = ctrl->value;
            write_reg(client, 0x12, dec->brightness, dec->channel);
            break;
        case V4L2_CID_CONTRAST:
            if (ctrl->value > 255)
                dec->contrast = 255;
            else if (ctrl->value < 0)
                dec->contrast = 0;
            else
                dec->contrast = ctrl->value;
            write_reg(client, 0x11, dec->contrast, dec->channel);
            break;
        case V4L2_CID_SATURATION:
            if (ctrl->value > 255)
                dec->saturation = 255;
            else if (ctrl->value < 0)
                dec->saturation = 0;
            else
                dec->saturation = ctrl->value;
            write_reg(client, 0x10, dec->saturation, dec->channel);
            break;
        case V4L2_CID_HUE:
            if (ctrl->value > 255)
                dec->hue = 255;
            else if (ctrl->value < 0)
                dec->hue = 0;
            else
                dec->hue = ctrl->value;
            write_reg(client, 0x0f, dec->hue, dec->channel);
            break;
        }
        break;
    }
    case VIDIOC_G_CTRL:
    {
        struct v4l2_control *ctrl = arg;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
            ctrl->value = dec->brightness;
            break;
        case V4L2_CID_CONTRAST:
            ctrl->value = dec->contrast;
            break;
        case V4L2_CID_SATURATION:
            ctrl->value = dec->saturation;
            break;
        case V4L2_CID_HUE:
            ctrl->value = dec->hue;
            break;
        }
        break;
    }
    default:
        break;
    }
    return 0;
}

static int wis_tw2804_probe(struct i2c_client *client,
                const struct i2c_device_id *id)
{
    struct i2c_adapter *adapter = client->adapter;
    struct wis_tw2804 *dec;

    if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
        return -ENODEV;

    dec = kmalloc(sizeof(struct wis_tw2804), GFP_KERNEL);
    if (dec == NULL)
        return -ENOMEM;

    dec->channel = -1;
    dec->norm = V4L2_STD_NTSC;
    dec->brightness = 128;
    dec->contrast = 128;
    dec->saturation = 128;
    dec->hue = 128;
    i2c_set_clientdata(client, dec);

    printk(KERN_DEBUG "wis-tw2804: creating TW2804 at address %d on %s\n",
        client->addr, adapter->name);

    return 0;
}

static int wis_tw2804_remove(struct i2c_client *client)
{
    struct wis_tw2804 *dec = i2c_get_clientdata(client);

    kfree(dec);
    return 0;
}

static const struct i2c_device_id wis_tw2804_id[] = {
    { "wis_tw2804", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wis_tw2804_id);

static struct i2c_driver wis_tw2804_driver = {
    .driver = {
        .name   = "WIS TW2804 I2C driver",
    },
    .probe      = wis_tw2804_probe,
    .remove     = wis_tw2804_remove,
    .command    = wis_tw2804_command,
    .id_table   = wis_tw2804_id,
};

static int __init wis_tw2804_init(void)
{
    return i2c_add_driver(&wis_tw2804_driver);
}

static void __exit wis_tw2804_cleanup(void)
{
    i2c_del_driver(&wis_tw2804_driver);
}

module_init(wis_tw2804_init);
module_exit(wis_tw2804_cleanup);

MODULE_LICENSE("GPL v2");