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
 18static 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
 25static 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
 33static 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
 42static 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
 63static 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
 70static 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
 77static 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
101static const struct i2c_device_id adxl34x_id[] = {
102	{ "adxl34x" },
103	{ }
104};
105
106MODULE_DEVICE_TABLE(i2c, adxl34x_id);
107
108static 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
123MODULE_DEVICE_TABLE(of, adxl34x_of_id);
124
125static 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
136module_i2c_driver(adxl34x_driver);
137
138MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
139MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
140MODULE_LICENSE("GPL");