Pileus Git - ~andy/linux/blob - drivers/input/misc/ad714x-i2c.c

   1 /*
   2  * AD714X CapTouch Programmable Controller driver (I2C bus)
   3  *
   4  * Copyright 2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/input.h>        /* BUS_I2C */
  10 #include <linux/i2c.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/pm.h>
  14 #include "ad714x.h"
  15
  16 #ifdef CONFIG_PM
  17 static int ad714x_i2c_suspend(struct device *dev)
  18 {
  19         return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
  20 }
  21
  22 static int ad714x_i2c_resume(struct device *dev)
  23 {
  24         return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
  25 }
  26 #endif
  27
  28 static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
  29
  30 static int ad714x_i2c_write(struct device *dev, unsigned short reg,
  31                                 unsigned short data)
  32 {
  33         struct i2c_client *client = to_i2c_client(dev);
  34         int ret = 0;
  35         unsigned short tx[2] = {
  36                 cpu_to_be16(reg),
  37                 cpu_to_be16(data)
  38         };
  39
  40         ret = i2c_master_send(client, (u8 *)tx, 4);
  41         if (ret < 0)
  42                 dev_err(&client->dev, "I2C write error\n");
  43
  44         return ret;
  45 }
  46
  47 static int ad714x_i2c_read(struct device *dev, unsigned short reg,
  48                                 unsigned short *data)
  49 {
  50         struct i2c_client *client = to_i2c_client(dev);
  51         int ret = 0;
  52         unsigned short tx = cpu_to_be16(reg);
  53
  54         ret = i2c_master_send(client, (u8 *)&tx, 2);
  55         if (ret >= 0)
  56                 ret = i2c_master_recv(client, (u8 *)data, 2);
  57
  58         if (unlikely(ret < 0))
  59                 dev_err(&client->dev, "I2C read error\n");
  60         else
  61                 *data = be16_to_cpu(*data);
  62
  63         return ret;
  64 }
  65
  66 static int __devinit ad714x_i2c_probe(struct i2c_client *client,
  67                                         const struct i2c_device_id *id)
  68 {
  69         struct ad714x_chip *chip;
  70
  71         chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
  72                             ad714x_i2c_read, ad714x_i2c_write);
  73         if (IS_ERR(chip))
  74                 return PTR_ERR(chip);
  75
  76         i2c_set_clientdata(client, chip);
  77
  78         return 0;
  79 }
  80
  81 static int __devexit ad714x_i2c_remove(struct i2c_client *client)
  82 {
  83         struct ad714x_chip *chip = i2c_get_clientdata(client);
  84
  85         ad714x_remove(chip);
  86
  87         return 0;
  88 }
  89
  90 static const struct i2c_device_id ad714x_id[] = {
  91         { "ad7142_captouch", 0 },
  92         { "ad7143_captouch", 0 },
  93         { "ad7147_captouch", 0 },
  94         { "ad7147a_captouch", 0 },
  95         { "ad7148_captouch", 0 },
  96         { }
  97 };
  98 MODULE_DEVICE_TABLE(i2c, ad714x_id);
  99
 100 static struct i2c_driver ad714x_i2c_driver = {
 101         .driver = {
 102                 .name = "ad714x_captouch",
 103                 .pm   = &ad714x_i2c_pm,
 104         },
 105         .probe    = ad714x_i2c_probe,
 106         .remove   = __devexit_p(ad714x_i2c_remove),
 107         .id_table = ad714x_id,
 108 };
 109
 110 static __init int ad714x_i2c_init(void)
 111 {
 112         return i2c_add_driver(&ad714x_i2c_driver);
 113 }
 114 module_init(ad714x_i2c_init);
 115
 116 static __exit void ad714x_i2c_exit(void)
 117 {
 118         i2c_del_driver(&ad714x_i2c_driver);
 119 }
 120 module_exit(ad714x_i2c_exit);
 121
 122 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
 123 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 124 MODULE_LICENSE("GPL");