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/version.h>
  21 #include <linux/i2c.h>
  22 #include <linux/videodev2.h>
  23 #include <media/tvaudio.h>
  24 #include <media/v4l2-common.h>
  25
  26 #include "wis-i2c.h"
  27
  28 static int write_reg(struct i2c_client *client, int reg, int value)
  29 {
  30         /* UDA1342 wants MSB first, but SMBus sends LSB first */
  31         i2c_smbus_write_word_data(client, reg, swab16(value));
  32         return 0;
  33 }
  34
  35 static int wis_uda1342_command(struct i2c_client *client,
  36                                 unsigned int cmd, void *arg)
  37 {
  38         switch (cmd) {
  39         case VIDIOC_S_AUDIO:
  40         {
  41                 int *inp = arg;
  42
  43                 switch (*inp) {
  44                 case TVAUDIO_INPUT_TUNER:
  45                         write_reg(client, 0x00, 0x1441); /* select input 2 */
  46                         break;
  47                 case TVAUDIO_INPUT_EXTERN:
  48                         write_reg(client, 0x00, 0x1241); /* select input 1 */
  49                         break;
  50                 default:
  51                         printk(KERN_ERR "wis-uda1342: input %d not supported\n",
  52                                         *inp);
  53                         break;
  54                 }
  55                 break;
  56         }
  57         default:
  58                 break;
  59         }
  60         return 0;
  61 }
  62
  63 static struct i2c_driver wis_uda1342_driver;
  64
  65 static struct i2c_client wis_uda1342_client_templ = {
  66         .name           = "UDA1342 (WIS)",
  67         .driver         = &wis_uda1342_driver,
  68 };
  69
  70 static int wis_uda1342_detect(struct i2c_adapter *adapter, int addr, int kind)
  71 {
  72         struct i2c_client *client;
  73
  74         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
  75                 return 0;
  76
  77         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
  78         if (client == NULL)
  79                 return -ENOMEM;
  80         memcpy(client, &wis_uda1342_client_templ,
  81                         sizeof(wis_uda1342_client_templ));
  82         client->adapter = adapter;
  83         client->addr = addr;
  84
  85         printk(KERN_DEBUG
  86                 "wis-uda1342: initializing UDA1342 at address %d on %s\n",
  87                 addr, adapter->name);
  88
  89         write_reg(client, 0x00, 0x8000); /* reset registers */
  90         write_reg(client, 0x00, 0x1241); /* select input 1 */
  91
  92         i2c_attach_client(client);
  93         return 0;
  94 }
  95
  96 static int wis_uda1342_detach(struct i2c_client *client)
  97 {
  98         int r;
  99
 100         r = i2c_detach_client(client);
 101         if (r < 0)
 102                 return r;
 103
 104         kfree(client);
 105         return 0;
 106 }
 107
 108 static struct i2c_driver wis_uda1342_driver = {
 109         .driver = {
 110                 .name   = "WIS UDA1342 I2C driver",
 111         },
 112         .id             = I2C_DRIVERID_WIS_UDA1342,
 113         .detach_client  = wis_uda1342_detach,
 114         .command        = wis_uda1342_command,
 115 };
 116
 117 static int __init wis_uda1342_init(void)
 118 {
 119         int r;
 120
 121         r = i2c_add_driver(&wis_uda1342_driver);
 122         if (r < 0)
 123                 return r;
 124         return wis_i2c_add_driver(wis_uda1342_driver.id, wis_uda1342_detect);
 125 }
 126
 127 static void __exit wis_uda1342_cleanup(void)
 128 {
 129         wis_i2c_del_driver(wis_uda1342_detect);
 130         i2c_del_driver(&wis_uda1342_driver);
 131 }
 132
 133 module_init(wis_uda1342_init);
 134 module_exit(wis_uda1342_cleanup);
 135
 136 MODULE_LICENSE("GPL v2");