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}; 89 90static struct i2c_driver wis_uda1342_driver = { 91 .driver = { 92 .name = "WIS UDA1342 I2C driver", 93 }, 94 .probe = wis_uda1342_probe, 95 .remove = wis_uda1342_remove, 96 .command = wis_uda1342_command, 97 .id_table = wis_uda1342_id, 98}; 99 100static int __init wis_uda1342_init(void) 101{ 102 return i2c_add_driver(&wis_uda1342_driver); 103} 104 105static void __exit wis_uda1342_cleanup(void) 106{ 107 i2c_del_driver(&wis_uda1342_driver); 108} 109 110module_init(wis_uda1342_init); 111module_exit(wis_uda1342_cleanup); 112 113MODULE_LICENSE("GPL v2"); 114