release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/go7007/wis-uda1342.c

   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
  27 static 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
  34 static 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
  62 static 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
  80 static int wis_uda1342_remove(struct i2c_client *client)
  81 {
  82         return 0;
  83 }
  84
  85 static const struct i2c_device_id wis_uda1342_id[] = {
  86         { "wis_uda1342", 0 },
  87         { }
  88 };
  89
  90 static 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
 100 static int __init wis_uda1342_init(void)
 101 {
 102         return i2c_add_driver(&wis_uda1342_driver);
 103 }
 104
 105 static void __exit wis_uda1342_cleanup(void)
 106 {
 107         i2c_del_driver(&wis_uda1342_driver);
 108 }
 109
 110 module_init(wis_uda1342_init);
 111 module_exit(wis_uda1342_cleanup);
 112
 113 MODULE_LICENSE("GPL v2");