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 struct i2c_driver wis_uda1342_driver;
  63
  64 static struct i2c_client wis_uda1342_client_templ = {
  65         .name           = "UDA1342 (WIS)",
  66         .driver         = &wis_uda1342_driver,
  67 };
  68
  69 static int wis_uda1342_detect(struct i2c_adapter *adapter, int addr, int kind)
  70 {
  71         struct i2c_client *client;
  72
  73         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
  74                 return 0;
  75
  76         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
  77         if (client == NULL)
  78                 return -ENOMEM;
  79         memcpy(client, &wis_uda1342_client_templ,
  80                         sizeof(wis_uda1342_client_templ));
  81         client->adapter = adapter;
  82         client->addr = addr;
  83
  84         printk(KERN_DEBUG
  85                 "wis-uda1342: initializing UDA1342 at address %d on %s\n",
  86                 addr, adapter->name);
  87
  88         write_reg(client, 0x00, 0x8000); /* reset registers */
  89         write_reg(client, 0x00, 0x1241); /* select input 1 */
  90
  91         i2c_attach_client(client);
  92         return 0;
  93 }
  94
  95 static int wis_uda1342_detach(struct i2c_client *client)
  96 {
  97         int r;
  98
  99         r = i2c_detach_client(client);
 100         if (r < 0)
 101                 return r;
 102
 103         kfree(client);
 104         return 0;
 105 }
 106
 107 static struct i2c_driver wis_uda1342_driver = {
 108         .driver = {
 109                 .name   = "WIS UDA1342 I2C driver",
 110         },
 111         .id             = I2C_DRIVERID_WIS_UDA1342,
 112         .detach_client  = wis_uda1342_detach,
 113         .command        = wis_uda1342_command,
 114 };
 115
 116 static int __init wis_uda1342_init(void)
 117 {
 118         int r;
 119
 120         r = i2c_add_driver(&wis_uda1342_driver);
 121         if (r < 0)
 122                 return r;
 123         return wis_i2c_add_driver(wis_uda1342_driver.id, wis_uda1342_detect);
 124 }
 125
 126 static void __exit wis_uda1342_cleanup(void)
 127 {
 128         wis_i2c_del_driver(wis_uda1342_detect);
 129         i2c_del_driver(&wis_uda1342_driver);
 130 }
 131
 132 module_init(wis_uda1342_init);
 133 module_exit(wis_uda1342_cleanup);
 134
 135 MODULE_LICENSE("GPL v2");