kernel/drivers/input/misc/adxl34x-i2c.c

   1 /*
   2  * ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface)
   3  *
   4  * Enter bugs at http://blackfin.uclinux.org/
   5  *
   6  * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
   7  * Licensed under the GPL-2 or later.
   8  */
   9
  10 #include <linux/input.h>        /* BUS_I2C */
  11 #include <linux/i2c.h>
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/pm.h>
  15 #include "adxl34x.h"
  16
  17 static int adxl34x_smbus_read(struct device *dev, unsigned char reg)
  18 {
  19         struct i2c_client *client = to_i2c_client(dev);
  20
  21         return i2c_smbus_read_byte_data(client, reg);
  22 }
  23
  24 static int adxl34x_smbus_write(struct device *dev,
  25                                unsigned char reg, unsigned char val)
  26 {
  27         struct i2c_client *client = to_i2c_client(dev);
  28
  29         return i2c_smbus_write_byte_data(client, reg, val);
  30 }
  31
  32 static int adxl34x_smbus_read_block(struct device *dev,
  33                                     unsigned char reg, int count,
  34                                     void *buf)
  35 {
  36         struct i2c_client *client = to_i2c_client(dev);
  37
  38         return i2c_smbus_read_i2c_block_data(client, reg, count, buf);
  39 }
  40
  41 static int adxl34x_i2c_read_block(struct device *dev,
  42                                   unsigned char reg, int count,
  43                                   void *buf)
  44 {
  45         struct i2c_client *client = to_i2c_client(dev);
  46         int ret;
  47
  48         ret = i2c_master_send(client, &reg, 1);
  49         if (ret < 0)
  50                 return ret;
  51
  52         ret = i2c_master_recv(client, buf, count);
  53         if (ret < 0)
  54                 return ret;
  55
  56         if (ret != count)
  57                 return -EIO;
  58
  59         return 0;
  60 }
  61
  62 static const struct adxl34x_bus_ops adxl34x_smbus_bops = {
  63         .bustype        = BUS_I2C,
  64         .write          = adxl34x_smbus_write,
  65         .read           = adxl34x_smbus_read,
  66         .read_block     = adxl34x_smbus_read_block,
  67 };
  68
  69 static const struct adxl34x_bus_ops adxl34x_i2c_bops = {
  70         .bustype        = BUS_I2C,
  71         .write          = adxl34x_smbus_write,
  72         .read           = adxl34x_smbus_read,
  73         .read_block     = adxl34x_i2c_read_block,
  74 };
  75
  76 static int adxl34x_i2c_probe(struct i2c_client *client,
  77                                        const struct i2c_device_id *id)
  78 {
  79         struct adxl34x *ac;
  80         int error;
  81
  82         error = i2c_check_functionality(client->adapter,
  83                         I2C_FUNC_SMBUS_BYTE_DATA);
  84         if (!error) {
  85                 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
  86                 return -EIO;
  87         }
  88
  89         ac = adxl34x_probe(&client->dev, client->irq, false,
  90                            i2c_check_functionality(client->adapter,
  91                                                    I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
  92                                 &adxl34x_smbus_bops : &adxl34x_i2c_bops);
  93         if (IS_ERR(ac))
  94                 return PTR_ERR(ac);
  95
  96         i2c_set_clientdata(client, ac);
  97
  98         return 0;
  99 }
 100
 101 static int adxl34x_i2c_remove(struct i2c_client *client)
 102 {
 103         struct adxl34x *ac = i2c_get_clientdata(client);
 104
 105         return adxl34x_remove(ac);
 106 }
 107
 108 static int __maybe_unused adxl34x_i2c_suspend(struct device *dev)
 109 {
 110         struct i2c_client *client = to_i2c_client(dev);
 111         struct adxl34x *ac = i2c_get_clientdata(client);
 112
 113         adxl34x_suspend(ac);
 114
 115         return 0;
 116 }
 117
 118 static int __maybe_unused adxl34x_i2c_resume(struct device *dev)
 119 {
 120         struct i2c_client *client = to_i2c_client(dev);
 121         struct adxl34x *ac = i2c_get_clientdata(client);
 122
 123         adxl34x_resume(ac);
 124
 125         return 0;
 126 }
 127
 128 static SIMPLE_DEV_PM_OPS(adxl34x_i2c_pm, adxl34x_i2c_suspend,
 129                          adxl34x_i2c_resume);
 130
 131 static const struct i2c_device_id adxl34x_id[] = {
 132         { "adxl34x", 0 },
 133         { }
 134 };
 135
 136 MODULE_DEVICE_TABLE(i2c, adxl34x_id);
 137
 138 static struct i2c_driver adxl34x_driver = {
 139         .driver = {
 140                 .name = "adxl34x",
 141                 .owner = THIS_MODULE,
 142                 .pm = &adxl34x_i2c_pm,
 143         },
 144         .probe    = adxl34x_i2c_probe,
 145         .remove   = adxl34x_i2c_remove,
 146         .id_table = adxl34x_id,
 147 };
 148
 149 module_i2c_driver(adxl34x_driver);
 150
 151 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 152 MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
 153 MODULE_LICENSE("GPL");