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/of.h>
  14 #include <linux/types.h>
  15 #include <linux/pm.h>
  16 #include "adxl34x.h"
  17
  18 static int adxl34x_smbus_read(struct device *dev, unsigned char reg)
  19 {
  20         struct i2c_client *client = to_i2c_client(dev);
  21
  22         return i2c_smbus_read_byte_data(client, reg);
  23 }
  24
  25 static int adxl34x_smbus_write(struct device *dev,
  26                                unsigned char reg, unsigned char val)
  27 {
  28         struct i2c_client *client = to_i2c_client(dev);
  29
  30         return i2c_smbus_write_byte_data(client, reg, val);
  31 }
  32
  33 static int adxl34x_smbus_read_block(struct device *dev,
  34                                     unsigned char reg, int count,
  35                                     void *buf)
  36 {
  37         struct i2c_client *client = to_i2c_client(dev);
  38
  39         return i2c_smbus_read_i2c_block_data(client, reg, count, buf);
  40 }
  41
  42 static int adxl34x_i2c_read_block(struct device *dev,
  43                                   unsigned char reg, int count,
  44                                   void *buf)
  45 {
  46         struct i2c_client *client = to_i2c_client(dev);
  47         int ret;
  48
  49         ret = i2c_master_send(client, &reg, 1);
  50         if (ret < 0)
  51                 return ret;
  52
  53         ret = i2c_master_recv(client, buf, count);
  54         if (ret < 0)
  55                 return ret;
  56
  57         if (ret != count)
  58                 return -EIO;
  59
  60         return 0;
  61 }
  62
  63 static const struct adxl34x_bus_ops adxl34x_smbus_bops = {
  64         .bustype        = BUS_I2C,
  65         .write          = adxl34x_smbus_write,
  66         .read           = adxl34x_smbus_read,
  67         .read_block     = adxl34x_smbus_read_block,
  68 };
  69
  70 static const struct adxl34x_bus_ops adxl34x_i2c_bops = {
  71         .bustype        = BUS_I2C,
  72         .write          = adxl34x_smbus_write,
  73         .read           = adxl34x_smbus_read,
  74         .read_block     = adxl34x_i2c_read_block,
  75 };
  76
  77 static int adxl34x_i2c_probe(struct i2c_client *client,
  78                                        const struct i2c_device_id *id)
  79 {
  80         struct adxl34x *ac;
  81         int error;
  82
  83         error = i2c_check_functionality(client->adapter,
  84                         I2C_FUNC_SMBUS_BYTE_DATA);
  85         if (!error) {
  86                 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
  87                 return -EIO;
  88         }
  89
  90         ac = adxl34x_probe(&client->dev, client->irq, false,
  91                            i2c_check_functionality(client->adapter,
  92                                                    I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
  93                                 &adxl34x_smbus_bops : &adxl34x_i2c_bops);
  94         if (IS_ERR(ac))
  95                 return PTR_ERR(ac);
  96
  97         i2c_set_clientdata(client, ac);
  98
  99         return 0;
 100 }
 101
 102 static int adxl34x_i2c_remove(struct i2c_client *client)
 103 {
 104         struct adxl34x *ac = i2c_get_clientdata(client);
 105
 106         return adxl34x_remove(ac);
 107 }
 108
 109 static int __maybe_unused adxl34x_i2c_suspend(struct device *dev)
 110 {
 111         struct i2c_client *client = to_i2c_client(dev);
 112         struct adxl34x *ac = i2c_get_clientdata(client);
 113
 114         adxl34x_suspend(ac);
 115
 116         return 0;
 117 }
 118
 119 static int __maybe_unused adxl34x_i2c_resume(struct device *dev)
 120 {
 121         struct i2c_client *client = to_i2c_client(dev);
 122         struct adxl34x *ac = i2c_get_clientdata(client);
 123
 124         adxl34x_resume(ac);
 125
 126         return 0;
 127 }
 128
 129 static SIMPLE_DEV_PM_OPS(adxl34x_i2c_pm, adxl34x_i2c_suspend,
 130                          adxl34x_i2c_resume);
 131
 132 static const struct i2c_device_id adxl34x_id[] = {
 133         { "adxl34x", 0 },
 134         { }
 135 };
 136
 137 MODULE_DEVICE_TABLE(i2c, adxl34x_id);
 138
 139 static const struct of_device_id adxl34x_of_id[] = {
 140         /*
 141          * The ADXL346 is backward-compatible with the ADXL345. Differences are
 142          * handled by runtime detection of the device model, there's thus no
 143          * need for listing the "adi,adxl346" compatible value explicitly.
 144          */
 145         { .compatible = "adi,adxl345", },
 146         /*
 147          * Deprecated, DT nodes should use one or more of the device-specific
 148          * compatible values "adi,adxl345" and "adi,adxl346".
 149          */
 150         { .compatible = "adi,adxl34x", },
 151         { }
 152 };
 153
 154 MODULE_DEVICE_TABLE(of, adxl34x_of_id);
 155
 156 static struct i2c_driver adxl34x_driver = {
 157         .driver = {
 158                 .name = "adxl34x",
 159                 .pm = &adxl34x_i2c_pm,
 160                 .of_match_table = adxl34x_of_id,
 161         },
 162         .probe    = adxl34x_i2c_probe,
 163         .remove   = adxl34x_i2c_remove,
 164         .id_table = adxl34x_id,
 165 };
 166
 167 module_i2c_driver(adxl34x_driver);
 168
 169 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 170 MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
 171 MODULE_LICENSE("GPL");