drivers/input/misc/adxl34x-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface)
   4  *
   5  * Enter bugs at http://blackfin.uclinux.org/
   6  *
   7  * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
   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 {
  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 const struct i2c_device_id adxl34x_id[] = {
 102         { "adxl34x" },
 103         { }
 104 };
 105
 106 MODULE_DEVICE_TABLE(i2c, adxl34x_id);
 107
 108 static const struct of_device_id adxl34x_of_id[] = {
 109         /*
 110          * The ADXL346 is backward-compatible with the ADXL345. Differences are
 111          * handled by runtime detection of the device model, there's thus no
 112          * need for listing the "adi,adxl346" compatible value explicitly.
 113          */
 114         { .compatible = "adi,adxl345", },
 115         /*
 116          * Deprecated, DT nodes should use one or more of the device-specific
 117          * compatible values "adi,adxl345" and "adi,adxl346".
 118          */
 119         { .compatible = "adi,adxl34x", },
 120         { }
 121 };
 122
 123 MODULE_DEVICE_TABLE(of, adxl34x_of_id);
 124
 125 static struct i2c_driver adxl34x_driver = {
 126         .driver = {
 127                 .name = "adxl34x",
 128                 .dev_groups = adxl34x_groups,
 129                 .pm = pm_sleep_ptr(&adxl34x_pm),
 130                 .of_match_table = adxl34x_of_id,
 131         },
 132         .probe    = adxl34x_i2c_probe,
 133         .id_table = adxl34x_id,
 134 };
 135
 136 module_i2c_driver(adxl34x_driver);
 137
 138 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 139 MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
 140 MODULE_LICENSE("GPL");