wis-ov7640.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 "wis-i2c.h"

struct wis_ov7640 {
    int brightness;
    int contrast;
    int saturation;
    int hue;
};

static u8 initial_registers[] =
{
    0x12, 0x80,
    0x12, 0x54,
    0x14, 0x24,
    0x15, 0x01,
    0x28, 0x20,
    0x75, 0x82,
    0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
};

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

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

static int wis_ov7640_probe(struct i2c_client *client,
                const struct i2c_device_id *id)
{
    struct i2c_adapter *adapter = client->adapter;

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

    client->flags = I2C_CLIENT_SCCB;

    printk(KERN_DEBUG
        "wis-ov7640: initializing OV7640 at address %d on %s\n",
        client->addr, adapter->name);

    if (write_regs(client, initial_registers) < 0) {
        printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
        return -ENODEV;
    }

    return 0;
}

static int wis_ov7640_remove(struct i2c_client *client)
{
    return 0;
}

static const struct i2c_device_id wis_ov7640_id[] = {
    { "wis_ov7640", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wis_ov7640_id);

static struct i2c_driver wis_ov7640_driver = {
    .driver = {
        .name   = "WIS OV7640 I2C driver",
    },
    .probe      = wis_ov7640_probe,
    .remove     = wis_ov7640_remove,
    .id_table   = wis_ov7640_id,
};

static int __init wis_ov7640_init(void)
{
    return i2c_add_driver(&wis_ov7640_driver);
}

static void __exit wis_ov7640_cleanup(void)
{
    i2c_del_driver(&wis_ov7640_driver);
}

module_init(wis_ov7640_init);
module_exit(wis_ov7640_cleanup);

MODULE_LICENSE("GPL v2");