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, ®, 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 void adxl34x_i2c_remove(struct i2c_client *client) 102{ 103 struct adxl34x *ac = i2c_get_clientdata(client); 104 105 adxl34x_remove(ac); 106} 107 108static const struct i2c_device_id adxl34x_id[] = { 109 { "adxl34x", 0 }, 110 { } 111}; 112 113MODULE_DEVICE_TABLE(i2c, adxl34x_id); 114 115static const struct of_device_id adxl34x_of_id[] = { 116 /* 117 * The ADXL346 is backward-compatible with the ADXL345. Differences are 118 * handled by runtime detection of the device model, there's thus no 119 * need for listing the "adi,adxl346" compatible value explicitly. 120 */ 121 { .compatible = "adi,adxl345", }, 122 /* 123 * Deprecated, DT nodes should use one or more of the device-specific 124 * compatible values "adi,adxl345" and "adi,adxl346". 125 */ 126 { .compatible = "adi,adxl34x", }, 127 { } 128}; 129 130MODULE_DEVICE_TABLE(of, adxl34x_of_id); 131 132static struct i2c_driver adxl34x_driver = { 133 .driver = { 134 .name = "adxl34x", 135 .pm = pm_sleep_ptr(&adxl34x_pm), 136 .of_match_table = adxl34x_of_id, 137 }, 138 .probe = adxl34x_i2c_probe, 139 .remove = adxl34x_i2c_remove, 140 .id_table = adxl34x_id, 141}; 142 143module_i2c_driver(adxl34x_driver); 144 145MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 146MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver"); 147MODULE_LICENSE("GPL"); 148