LXR linux/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
  14static 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
  21static 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
  40static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
  41        .s_routing = uda1342_s_routing,
  42};
  43
  44static const struct v4l2_subdev_ops uda1342_ops = {
  45        .audio = &uda1342_audio_ops,
  46};
  47
  48static int uda1342_probe(struct i2c_client *client,
  49                             const struct i2c_device_id *id)
  50{
  51        struct i2c_adapter *adapter = client->adapter;
  52        struct v4l2_subdev *sd;
  53
  54        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
  55                return -ENODEV;
  56
  57        dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
  58                client->addr, adapter->name);
  59
  60        sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
  61        if (sd == NULL)
  62                return -ENOMEM;
  63
  64        v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
  65
  66        write_reg(client, 0x00, 0x8000); /* reset registers */
  67        write_reg(client, 0x00, 0x1241); /* select input 1 */
  68
  69        v4l_info(client, "chip found @ 0x%02x (%s)\n",
  70                        client->addr << 1, client->adapter->name);
  71
  72        return 0;
  73}
  74
  75static int uda1342_remove(struct i2c_client *client)
  76{
  77        struct v4l2_subdev *sd = i2c_get_clientdata(client);
  78
  79        v4l2_device_unregister_subdev(sd);
  80        return 0;
  81}
  82
  83static const struct i2c_device_id uda1342_id[] = {
  84        { "uda1342", 0 },
  85        { }
  86};
  87MODULE_DEVICE_TABLE(i2c, uda1342_id);
  88
  89static struct i2c_driver uda1342_driver = {
  90        .driver = {
  91                .name   = "uda1342",
  92        },
  93        .probe          = uda1342_probe,
  94        .remove         = uda1342_remove,
  95        .id_table       = uda1342_id,
  96};
  97
  98module_i2c_driver(uda1342_driver);
  99
 100MODULE_LICENSE("GPL v2");
 101