drivers/media/i2c/uda1342.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2005-2006 Micronas USA Inc.
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/init.h>
   8 #include <linux/i2c.h>
   9 #include <linux/videodev2.h>
  10 #include <media/v4l2-device.h>
  11 #include <media/i2c/uda1342.h>
  12 #include <linux/slab.h>
  13
  14 static int write_reg(struct i2c_client *client, int reg, int value)
  15 {
  16         /* UDA1342 wants MSB first, but SMBus sends LSB first */
  17         i2c_smbus_write_word_data(client, reg, swab16(value));
  18         return 0;
  19 }
  20
  21 static int uda1342_s_routing(struct v4l2_subdev *sd,
  22                 u32 input, u32 output, u32 config)
  23 {
  24         struct i2c_client *client = v4l2_get_subdevdata(sd);
  25
  26         switch (input) {
  27         case UDA1342_IN1:
  28                 write_reg(client, 0x00, 0x1241); /* select input 1 */
  29                 break;
  30         case UDA1342_IN2:
  31                 write_reg(client, 0x00, 0x1441); /* select input 2 */
  32                 break;
  33         default:
  34                 v4l2_err(sd, "input %d not supported\n", input);
  35                 break;
  36         }
  37         return 0;
  38 }
  39
  40 static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
  41         .s_routing = uda1342_s_routing,
  42 };
  43
  44 static const struct v4l2_subdev_ops uda1342_ops = {
  45         .audio = &uda1342_audio_ops,
  46 };
  47
  48 static int uda1342_probe(struct i2c_client *client)
  49 {
  50         struct i2c_adapter *adapter = client->adapter;
  51         struct v4l2_subdev *sd;
  52
  53         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
  54                 return -ENODEV;
  55
  56         dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
  57                 client->addr, adapter->name);
  58
  59         sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
  60         if (sd == NULL)
  61                 return -ENOMEM;
  62
  63         v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
  64
  65         write_reg(client, 0x00, 0x8000); /* reset registers */
  66         write_reg(client, 0x00, 0x1241); /* select input 1 */
  67
  68         v4l_info(client, "chip found @ 0x%02x (%s)\n",
  69                         client->addr << 1, client->adapter->name);
  70
  71         return 0;
  72 }
  73
  74 static void uda1342_remove(struct i2c_client *client)
  75 {
  76         struct v4l2_subdev *sd = i2c_get_clientdata(client);
  77
  78         v4l2_device_unregister_subdev(sd);
  79 }
  80
  81 static const struct i2c_device_id uda1342_id[] = {
  82         { "uda1342", 0 },
  83         { }
  84 };
  85 MODULE_DEVICE_TABLE(i2c, uda1342_id);
  86
  87 static struct i2c_driver uda1342_driver = {
  88         .driver = {
  89                 .name   = "uda1342",
  90         },
  91         .probe          = uda1342_probe,
  92         .remove         = uda1342_remove,
  93         .id_table       = uda1342_id,
  94 };
  95
  96 module_i2c_driver(uda1342_driver);
  97
  98 MODULE_LICENSE("GPL v2");