cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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uda1342.c (2313B)

      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");