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 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software Foundation, 15 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/i2c.h> 21 #include <linux/videodev2.h> 22 #include <media/v4l2-device.h> 23 #include <media/i2c/uda1342.h> 24 #include <linux/slab.h> 25 26 static int write_reg(struct i2c_client *client, int reg, int value) 27 { 28 /* UDA1342 wants MSB first, but SMBus sends LSB first */ 29 i2c_smbus_write_word_data(client, reg, swab16(value)); 30 return 0; 31 } 32 33 static int uda1342_s_routing(struct v4l2_subdev *sd, 34 u32 input, u32 output, u32 config) 35 { 36 struct i2c_client *client = v4l2_get_subdevdata(sd); 37 38 switch (input) { 39 case UDA1342_IN1: 40 write_reg(client, 0x00, 0x1241); /* select input 1 */ 41 break; 42 case UDA1342_IN2: 43 write_reg(client, 0x00, 0x1441); /* select input 2 */ 44 break; 45 default: 46 v4l2_err(sd, "input %d not supported\n", input); 47 break; 48 } 49 return 0; 50 } 51 52 static const struct v4l2_subdev_audio_ops uda1342_audio_ops = { 53 .s_routing = uda1342_s_routing, 54 }; 55 56 static const struct v4l2_subdev_ops uda1342_ops = { 57 .audio = &uda1342_audio_ops, 58 }; 59 60 static int uda1342_probe(struct i2c_client *client, 61 const struct i2c_device_id *id) 62 { 63 struct i2c_adapter *adapter = client->adapter; 64 struct v4l2_subdev *sd; 65 66 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) 67 return -ENODEV; 68 69 dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n", 70 client->addr, adapter->name); 71 72 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 73 if (sd == NULL) 74 return -ENOMEM; 75 76 v4l2_i2c_subdev_init(sd, client, &uda1342_ops); 77 78 write_reg(client, 0x00, 0x8000); /* reset registers */ 79 write_reg(client, 0x00, 0x1241); /* select input 1 */ 80 81 v4l_info(client, "chip found @ 0x%02x (%s)\n", 82 client->addr << 1, client->adapter->name); 83 84 return 0; 85 } 86 87 static int uda1342_remove(struct i2c_client *client) 88 { 89 struct v4l2_subdev *sd = i2c_get_clientdata(client); 90 91 v4l2_device_unregister_subdev(sd); 92 return 0; 93 } 94 95 static const struct i2c_device_id uda1342_id[] = { 96 { "uda1342", 0 }, 97 { } 98 }; 99 MODULE_DEVICE_TABLE(i2c, uda1342_id); 100 101 static struct i2c_driver uda1342_driver = { 102 .driver = { 103 .name = "uda1342", 104 }, 105 .probe = uda1342_probe, 106 .remove = uda1342_remove, 107 .id_table = uda1342_id, 108 }; 109 110 module_i2c_driver(uda1342_driver); 111 112 MODULE_LICENSE("GPL v2"); 113