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 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/i2c.h> 17 #include <linux/videodev2.h> 18 #include <media/v4l2-device.h> 19 #include <media/i2c/uda1342.h> 20 #include <linux/slab.h> 21 22 static int write_reg(struct i2c_client *client, int reg, int value) 23 { 24 /* UDA1342 wants MSB first, but SMBus sends LSB first */ 25 i2c_smbus_write_word_data(client, reg, swab16(value)); 26 return 0; 27 } 28 29 static int uda1342_s_routing(struct v4l2_subdev *sd, 30 u32 input, u32 output, u32 config) 31 { 32 struct i2c_client *client = v4l2_get_subdevdata(sd); 33 34 switch (input) { 35 case UDA1342_IN1: 36 write_reg(client, 0x00, 0x1241); /* select input 1 */ 37 break; 38 case UDA1342_IN2: 39 write_reg(client, 0x00, 0x1441); /* select input 2 */ 40 break; 41 default: 42 v4l2_err(sd, "input %d not supported\n", input); 43 break; 44 } 45 return 0; 46 } 47 48 static const struct v4l2_subdev_audio_ops uda1342_audio_ops = { 49 .s_routing = uda1342_s_routing, 50 }; 51 52 static const struct v4l2_subdev_ops uda1342_ops = { 53 .audio = &uda1342_audio_ops, 54 }; 55 56 static int uda1342_probe(struct i2c_client *client, 57 const struct i2c_device_id *id) 58 { 59 struct i2c_adapter *adapter = client->adapter; 60 struct v4l2_subdev *sd; 61 62 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) 63 return -ENODEV; 64 65 dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n", 66 client->addr, adapter->name); 67 68 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 69 if (sd == NULL) 70 return -ENOMEM; 71 72 v4l2_i2c_subdev_init(sd, client, &uda1342_ops); 73 74 write_reg(client, 0x00, 0x8000); /* reset registers */ 75 write_reg(client, 0x00, 0x1241); /* select input 1 */ 76 77 v4l_info(client, "chip found @ 0x%02x (%s)\n", 78 client->addr << 1, client->adapter->name); 79 80 return 0; 81 } 82 83 static int uda1342_remove(struct i2c_client *client) 84 { 85 struct v4l2_subdev *sd = i2c_get_clientdata(client); 86 87 v4l2_device_unregister_subdev(sd); 88 return 0; 89 } 90 91 static const struct i2c_device_id uda1342_id[] = { 92 { "uda1342", 0 }, 93 { } 94 }; 95 MODULE_DEVICE_TABLE(i2c, uda1342_id); 96 97 static struct i2c_driver uda1342_driver = { 98 .driver = { 99 .name = "uda1342", 100 }, 101 .probe = uda1342_probe, 102 .remove = uda1342_remove, 103 .id_table = uda1342_id, 104 }; 105 106 module_i2c_driver(uda1342_driver); 107 108 MODULE_LICENSE("GPL v2"); 109