LXR linux/drivers/gpio/gpio-max7300.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2009 Wolfram Sang, Pengutronix
   4 *
   5 * Check max730x.c for further details.
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/init.h>
  10#include <linux/platform_device.h>
  11#include <linux/mutex.h>
  12#include <linux/i2c.h>
  13#include <linux/spi/max7301.h>
  14#include <linux/slab.h>
  15
  16static int max7300_i2c_write(struct device *dev, unsigned int reg,
  17                                unsigned int val)
  18{
  19        struct i2c_client *client = to_i2c_client(dev);
  20
  21        return i2c_smbus_write_byte_data(client, reg, val);
  22}
  23
  24static int max7300_i2c_read(struct device *dev, unsigned int reg)
  25{
  26        struct i2c_client *client = to_i2c_client(dev);
  27
  28        return i2c_smbus_read_byte_data(client, reg);
  29}
  30
  31static int max7300_probe(struct i2c_client *client,
  32                         const struct i2c_device_id *id)
  33{
  34        struct max7301 *ts;
  35
  36        if (!i2c_check_functionality(client->adapter,
  37                        I2C_FUNC_SMBUS_BYTE_DATA))
  38                return -EIO;
  39
  40        ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
  41        if (!ts)
  42                return -ENOMEM;
  43
  44        ts->read = max7300_i2c_read;
  45        ts->write = max7300_i2c_write;
  46        ts->dev = &client->dev;
  47
  48        return __max730x_probe(ts);
  49}
  50
  51static int max7300_remove(struct i2c_client *client)
  52{
  53        return __max730x_remove(&client->dev);
  54}
  55
  56static const struct i2c_device_id max7300_id[] = {
  57        { "max7300", 0 },
  58        { }
  59};
  60MODULE_DEVICE_TABLE(i2c, max7300_id);
  61
  62static struct i2c_driver max7300_driver = {
  63        .driver = {
  64                .name = "max7300",
  65        },
  66        .probe = max7300_probe,
  67        .remove = max7300_remove,
  68        .id_table = max7300_id,
  69};
  70
  71static int __init max7300_init(void)
  72{
  73        return i2c_add_driver(&max7300_driver);
  74}
  75subsys_initcall(max7300_init);
  76
  77static void __exit max7300_exit(void)
  78{
  79        i2c_del_driver(&max7300_driver);
  80}
  81module_exit(max7300_exit);
  82
  83MODULE_AUTHOR("Wolfram Sang");
  84MODULE_LICENSE("GPL v2");
  85MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
  86