wis-uda1342.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 <media/tvaudio.h>
#include <media/v4l2-common.h>

#include "wis-i2c.h"

static int write_reg(struct i2c_client *client, int reg, int value)
{
    /* UDA1342 wants MSB first, but SMBus sends LSB first */
    i2c_smbus_write_word_data(client, reg, swab16(value));
    return 0;
}

static int wis_uda1342_command(struct i2c_client *client,
                unsigned int cmd, void *arg)
{
    switch (cmd) {
    case VIDIOC_S_AUDIO:
    {
        int *inp = arg;

        switch (*inp) {
        case TVAUDIO_INPUT_TUNER:
            write_reg(client, 0x00, 0x1441); /* select input 2 */
            break;
        case TVAUDIO_INPUT_EXTERN:
            write_reg(client, 0x00, 0x1241); /* select input 1 */
            break;
        default:
            printk(KERN_ERR "wis-uda1342: input %d not supported\n",
                    *inp);
            break;
        }
        break;
    }
    default:
        break;
    }
    return 0;
}

static int wis_uda1342_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_WORD_DATA))
        return -ENODEV;

    printk(KERN_DEBUG
        "wis-uda1342: initializing UDA1342 at address %d on %s\n",
        client->addr, adapter->name);

    write_reg(client, 0x00, 0x8000); /* reset registers */
    write_reg(client, 0x00, 0x1241); /* select input 1 */

    return 0;
}

static int wis_uda1342_remove(struct i2c_client *client)
{
    return 0;
}

static const struct i2c_device_id wis_uda1342_id[] = {
    { "wis_uda1342", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wis_uda1342_id);

static struct i2c_driver wis_uda1342_driver = {
    .driver = {
        .name   = "WIS UDA1342 I2C driver",
    },
    .probe      = wis_uda1342_probe,
    .remove     = wis_uda1342_remove,
    .command    = wis_uda1342_command,
    .id_table   = wis_uda1342_id,
};

static int __init wis_uda1342_init(void)
{
    return i2c_add_driver(&wis_uda1342_driver);
}

static void __exit wis_uda1342_cleanup(void)
{
    i2c_del_driver(&wis_uda1342_driver);
}

module_init(wis_uda1342_init);
module_exit(wis_uda1342_cleanup);

MODULE_LICENSE("GPL v2");