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  * 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/v4l2-device.h>
  23 #include <media/uda1342.h>
  24 #include <linux/slab.h>
  25
  26 static int write_reg(struct i2c_client *client, int reg, int value)
  27 {
  28         /* UDA1342 wants MSB first, but SMBus sends LSB first */
  29         i2c_smbus_write_word_data(client, reg, swab16(value));
  30         return 0;
  31 }
  32
  33 static int uda1342_s_routing(struct v4l2_subdev *sd,
  34                 u32 input, u32 output, u32 config)
  35 {
  36         struct i2c_client *client = v4l2_get_subdevdata(sd);
  37
  38         switch (input) {
  39         case UDA1342_IN1:
  40                 write_reg(client, 0x00, 0x1241); /* select input 1 */
  41                 break;
  42         case UDA1342_IN2:
  43                 write_reg(client, 0x00, 0x1441); /* select input 2 */
  44                 break;
  45         default:
  46                 v4l2_err(sd, "input %d not supported\n", input);
  47                 break;
  48         }
  49         return 0;
  50 }
  51
  52 static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
  53         .s_routing = uda1342_s_routing,
  54 };
  55
  56 static const struct v4l2_subdev_ops uda1342_ops = {
  57         .audio = &uda1342_audio_ops,
  58 };
  59
  60 static int uda1342_probe(struct i2c_client *client,
  61                              const struct i2c_device_id *id)
  62 {
  63         struct i2c_adapter *adapter = client->adapter;
  64         struct v4l2_subdev *sd;
  65
  66         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
  67                 return -ENODEV;
  68
  69         dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
  70                 client->addr, adapter->name);
  71
  72         sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
  73         if (sd == NULL)
  74                 return -ENOMEM;
  75
  76         v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
  77
  78         write_reg(client, 0x00, 0x8000); /* reset registers */
  79         write_reg(client, 0x00, 0x1241); /* select input 1 */
  80
  81         v4l_info(client, "chip found @ 0x%02x (%s)\n",
  82                         client->addr << 1, client->adapter->name);
  83
  84         return 0;
  85 }
  86
  87 static int uda1342_remove(struct i2c_client *client)
  88 {
  89         struct v4l2_subdev *sd = i2c_get_clientdata(client);
  90
  91         v4l2_device_unregister_subdev(sd);
  92         return 0;
  93 }
  94
  95 static const struct i2c_device_id uda1342_id[] = {
  96         { "uda1342", 0 },
  97         { }
  98 };
  99 MODULE_DEVICE_TABLE(i2c, uda1342_id);
 100
 101 static struct i2c_driver uda1342_driver = {
 102         .driver = {
 103                 .name   = "uda1342",
 104         },
 105         .probe          = uda1342_probe,
 106         .remove         = uda1342_remove,
 107         .id_table       = uda1342_id,
 108 };
 109
 110 module_i2c_driver(uda1342_driver);
 111
 112 MODULE_LICENSE("GPL v2");