drivers/media/i2c/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
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/i2c.h>
  17 #include <linux/videodev2.h>
  18 #include <media/v4l2-device.h>
  19 #include <media/i2c/uda1342.h>
  20 #include <linux/slab.h>
  21
  22 static int write_reg(struct i2c_client *client, int reg, int value)
  23 {
  24         /* UDA1342 wants MSB first, but SMBus sends LSB first */
  25         i2c_smbus_write_word_data(client, reg, swab16(value));
  26         return 0;
  27 }
  28
  29 static int uda1342_s_routing(struct v4l2_subdev *sd,
  30                 u32 input, u32 output, u32 config)
  31 {
  32         struct i2c_client *client = v4l2_get_subdevdata(sd);
  33
  34         switch (input) {
  35         case UDA1342_IN1:
  36                 write_reg(client, 0x00, 0x1241); /* select input 1 */
  37                 break;
  38         case UDA1342_IN2:
  39                 write_reg(client, 0x00, 0x1441); /* select input 2 */
  40                 break;
  41         default:
  42                 v4l2_err(sd, "input %d not supported\n", input);
  43                 break;
  44         }
  45         return 0;
  46 }
  47
  48 static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
  49         .s_routing = uda1342_s_routing,
  50 };
  51
  52 static const struct v4l2_subdev_ops uda1342_ops = {
  53         .audio = &uda1342_audio_ops,
  54 };
  55
  56 static int uda1342_probe(struct i2c_client *client,
  57                              const struct i2c_device_id *id)
  58 {
  59         struct i2c_adapter *adapter = client->adapter;
  60         struct v4l2_subdev *sd;
  61
  62         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
  63                 return -ENODEV;
  64
  65         dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
  66                 client->addr, adapter->name);
  67
  68         sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
  69         if (sd == NULL)
  70                 return -ENOMEM;
  71
  72         v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
  73
  74         write_reg(client, 0x00, 0x8000); /* reset registers */
  75         write_reg(client, 0x00, 0x1241); /* select input 1 */
  76
  77         v4l_info(client, "chip found @ 0x%02x (%s)\n",
  78                         client->addr << 1, client->adapter->name);
  79
  80         return 0;
  81 }
  82
  83 static int uda1342_remove(struct i2c_client *client)
  84 {
  85         struct v4l2_subdev *sd = i2c_get_clientdata(client);
  86
  87         v4l2_device_unregister_subdev(sd);
  88         return 0;
  89 }
  90
  91 static const struct i2c_device_id uda1342_id[] = {
  92         { "uda1342", 0 },
  93         { }
  94 };
  95 MODULE_DEVICE_TABLE(i2c, uda1342_id);
  96
  97 static struct i2c_driver uda1342_driver = {
  98         .driver = {
  99                 .name   = "uda1342",
 100         },
 101         .probe          = uda1342_probe,
 102         .remove         = uda1342_remove,
 103         .id_table       = uda1342_id,
 104 };
 105
 106 module_i2c_driver(uda1342_driver);
 107
 108 MODULE_LICENSE("GPL v2");