wis-saa7113.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_saa7113 {
    int norm;
    int brightness;
    int contrast;
    int saturation;
    int hue;
};

static u8 initial_registers[] =
{
    0x01, 0x08,
    0x02, 0xc0,
    0x03, 0x33,
    0x04, 0x00,
    0x05, 0x00,
    0x06, 0xe9,
    0x07, 0x0d,
    0x08, 0xd8,
    0x09, 0x40,
    0x0a, 0x80,
    0x0b, 0x47,
    0x0c, 0x40,
    0x0d, 0x00,
    0x0e, 0x01,
    0x0f, 0x2a,
    0x10, 0x40,
    0x11, 0x0c,
    0x12, 0xfe,
    0x13, 0x00,
    0x14, 0x00,
    0x15, 0x04,
    0x16, 0x00,
    0x17, 0x00,
    0x18, 0x00,
    0x19, 0x00,
    0x1a, 0x00,
    0x1b, 0x00,
    0x1c, 0x00,
    0x1d, 0x00,
    0x1e, 0x00,
    0x1f, 0xc8,
    0x40, 0x00,
    0x41, 0xff,
    0x42, 0xff,
    0x43, 0xff,
    0x44, 0xff,
    0x45, 0xff,
    0x46, 0xff,
    0x47, 0xff,
    0x48, 0xff,
    0x49, 0xff,
    0x4a, 0xff,
    0x4b, 0xff,
    0x4c, 0xff,
    0x4d, 0xff,
    0x4e, 0xff,
    0x4f, 0xff,
    0x50, 0xff,
    0x51, 0xff,
    0x52, 0xff,
    0x53, 0xff,
    0x54, 0xff,
    0x55, 0xff,
    0x56, 0xff,
    0x57, 0xff,
    0x58, 0x00,
    0x59, 0x54,
    0x5a, 0x07,
    0x5b, 0x83,
    0x5c, 0x00,
    0x5d, 0x00,
    0x5e, 0x00,
    0x5f, 0x00,
    0x60, 0x00,
    0x61, 0x00,
    0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
};

static int write_reg(struct i2c_client *client, u8 reg, u8 value)
{
    return i2c_smbus_write_byte_data(client, reg, value);
}

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

    for (i = 0; regs[i] != 0x00; i += 2)
        if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
            return -1;
    return 0;
}

static int wis_saa7113_command(struct i2c_client *client,
                unsigned int cmd, void *arg)
{
    struct wis_saa7113 *dec = i2c_get_clientdata(client);

    switch (cmd) {
    case VIDIOC_S_INPUT:
    {
        int *input = arg;

        i2c_smbus_write_byte_data(client, 0x02, 0xC0 | *input);
        i2c_smbus_write_byte_data(client, 0x09,
                *input < 6 ? 0x40 : 0x80);
        break;
    }
    case VIDIOC_S_STD:
    {
        v4l2_std_id *input = arg;
        dec->norm = *input;
        if (dec->norm & V4L2_STD_NTSC) {
            write_reg(client, 0x0e, 0x01);
            write_reg(client, 0x10, 0x40);
        } else if (dec->norm & V4L2_STD_PAL) {
            write_reg(client, 0x0e, 0x01);
            write_reg(client, 0x10, 0x48);
        } else if (dec->norm * V4L2_STD_SECAM) {
            write_reg(client, 0x0e, 0x50);
            write_reg(client, 0x10, 0x48);
        }
        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 = 127;
            ctrl->step = 1;
            ctrl->default_value = 71;
            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 = 127;
            ctrl->step = 1;
            ctrl->default_value = 64;
            ctrl->flags = 0;
            break;
        case V4L2_CID_HUE:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Hue", sizeof(ctrl->name));
            ctrl->minimum = -128;
            ctrl->maximum = 127;
            ctrl->step = 1;
            ctrl->default_value = 0;
            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, 0x0a, dec->brightness);
            break;
        case V4L2_CID_CONTRAST:
            if (ctrl->value > 127)
                dec->contrast = 127;
            else if (ctrl->value < 0)
                dec->contrast = 0;
            else
                dec->contrast = ctrl->value;
            write_reg(client, 0x0b, dec->contrast);
            break;
        case V4L2_CID_SATURATION:
            if (ctrl->value > 127)
                dec->saturation = 127;
            else if (ctrl->value < 0)
                dec->saturation = 0;
            else
                dec->saturation = ctrl->value;
            write_reg(client, 0x0c, dec->saturation);
            break;
        case V4L2_CID_HUE:
            if (ctrl->value > 127)
                dec->hue = 127;
            else if (ctrl->value < -128)
                dec->hue = -128;
            else
                dec->hue = ctrl->value;
            write_reg(client, 0x0d, dec->hue);
            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_saa7113_probe(struct i2c_client *client,
                 const struct i2c_device_id *id)
{
    struct i2c_adapter *adapter = client->adapter;
    struct wis_saa7113 *dec;

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

    dec = kmalloc(sizeof(struct wis_saa7113), GFP_KERNEL);
    if (dec == NULL)
        return -ENOMEM;

    dec->norm = V4L2_STD_NTSC;
    dec->brightness = 128;
    dec->contrast = 71;
    dec->saturation = 64;
    dec->hue = 0;
    i2c_set_clientdata(client, dec);

    printk(KERN_DEBUG
        "wis-saa7113: initializing SAA7113 at address %d on %s\n",
        client->addr, adapter->name);

    if (write_regs(client, initial_registers) < 0) {
        printk(KERN_ERR
            "wis-saa7113: error initializing SAA7113\n");
        kfree(dec);
        return -ENODEV;
    }

    return 0;
}

static int wis_saa7113_remove(struct i2c_client *client)
{
    struct wis_saa7113 *dec = i2c_get_clientdata(client);

    kfree(dec);
    return 0;
}

static const struct i2c_device_id wis_saa7113_id[] = {
    { "wis_saa7113", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wis_saa7113_id);

static struct i2c_driver wis_saa7113_driver = {
    .driver = {
        .name   = "WIS SAA7113 I2C driver",
    },
    .probe      = wis_saa7113_probe,
    .remove     = wis_saa7113_remove,
    .command    = wis_saa7113_command,
    .id_table   = wis_saa7113_id,
};

static int __init wis_saa7113_init(void)
{
    return i2c_add_driver(&wis_saa7113_driver);
}

static void __exit wis_saa7113_cleanup(void)
{
    i2c_del_driver(&wis_saa7113_driver);
}

module_init(wis_saa7113_init);
module_exit(wis_saa7113_cleanup);

MODULE_LICENSE("GPL v2");