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1// SPDX-License-Identifier: GPL-2.0-only2/*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{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 74static 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 81static const struct i2c_device_id uda1342_id[] = {82 { "uda1342" },83 { }84};85MODULE_DEVICE_TABLE(i2c, uda1342_id);86 87static 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 96module_i2c_driver(uda1342_driver);97 98MODULE_DESCRIPTION("Philips UDA1342 audio codec driver");99MODULE_LICENSE("GPL v2");100