1/*
  2 * Copyright (C) 2005-2006 Micronas USA Inc.
  3 *
  4 * This program is free software; you can redistribute it and/or modify
  5 * it under the terms of the GNU General Public License (Version 2) as
  6 * published by the Free Software Foundation.
  7 *
  8 * This program is distributed in the hope that it will be useful,
  9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11 * GNU General Public License for more details.
 12 *
 13 * You should have received a copy of the GNU General Public License
 14 * along with this program; if not, write to the Free Software Foundation,
 15 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 16 */
 17
 18#include <linux/module.h>
 19#include <linux/init.h>
 20#include <linux/i2c.h>
 21#include <linux/videodev2.h>
 22#include <media/tvaudio.h>
 23#include <media/v4l2-common.h>
 24
 25#include "wis-i2c.h"
 26
 27static int write_reg(struct i2c_client *client, int reg, int value)
 28{
 29	/* UDA1342 wants MSB first, but SMBus sends LSB first */
 30	i2c_smbus_write_word_data(client, reg, swab16(value));
 31	return 0;
 32}
 33
 34static int wis_uda1342_command(struct i2c_client *client,
 35				unsigned int cmd, void *arg)
 36{
 37	switch (cmd) {
 38	case VIDIOC_S_AUDIO:
 39	{
 40		int *inp = arg;
 41
 42		switch (*inp) {
 43		case TVAUDIO_INPUT_TUNER:
 44			write_reg(client, 0x00, 0x1441); /* select input 2 */
 45			break;
 46		case TVAUDIO_INPUT_EXTERN:
 47			write_reg(client, 0x00, 0x1241); /* select input 1 */
 48			break;
 49		default:
 50			printk(KERN_ERR "wis-uda1342: input %d not supported\n",
 51					*inp);
 52			break;
 53		}
 54		break;
 55	}
 56	default:
 57		break;
 58	}
 59	return 0;
 60}
 61
 62static int wis_uda1342_probe(struct i2c_client *client,
 63			     const struct i2c_device_id *id)
 64{
 65	struct i2c_adapter *adapter = client->adapter;
 66
 67	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
 68		return -ENODEV;
 69
 70	printk(KERN_DEBUG
 71		"wis-uda1342: initializing UDA1342 at address %d on %s\n",
 72		client->addr, adapter->name);
 73
 74	write_reg(client, 0x00, 0x8000); /* reset registers */
 75	write_reg(client, 0x00, 0x1241); /* select input 1 */
 76
 77	return 0;
 78}
 79
 80static int wis_uda1342_remove(struct i2c_client *client)
 81{
 82	return 0;
 83}
 84
 85static const struct i2c_device_id wis_uda1342_id[] = {
 86	{ "wis_uda1342", 0 },
 87	{ }
 88};
 89MODULE_DEVICE_TABLE(i2c, wis_uda1342_id);
 90
 91static struct i2c_driver wis_uda1342_driver = {
 92	.driver = {
 93		.name	= "WIS UDA1342 I2C driver",
 94	},
 95	.probe		= wis_uda1342_probe,
 96	.remove		= wis_uda1342_remove,
 97	.command	= wis_uda1342_command,
 98	.id_table	= wis_uda1342_id,
 99};
100
101static int __init wis_uda1342_init(void)
102{
103	return i2c_add_driver(&wis_uda1342_driver);
104}
105
106static void __exit wis_uda1342_cleanup(void)
107{
108	i2c_del_driver(&wis_uda1342_driver);
109}
110
111module_init(wis_uda1342_init);
112module_exit(wis_uda1342_cleanup);
113
114MODULE_LICENSE("GPL v2");