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
  16 static 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
  24 static 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
  31 static int max7300_probe(struct i2c_client *client)
  32 {
  33         struct max7301 *ts;
  34
  35         if (!i2c_check_functionality(client->adapter,
  36                         I2C_FUNC_SMBUS_BYTE_DATA))
  37                 return -EIO;
  38
  39         ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
  40         if (!ts)
  41                 return -ENOMEM;
  42
  43         ts->read = max7300_i2c_read;
  44         ts->write = max7300_i2c_write;
  45         ts->dev = &client->dev;
  46
  47         return __max730x_probe(ts);
  48 }
  49
  50 static void max7300_remove(struct i2c_client *client)
  51 {
  52         __max730x_remove(&client->dev);
  53 }
  54
  55 static const struct i2c_device_id max7300_id[] = {
  56         { "max7300" },
  57         { }
  58 };
  59 MODULE_DEVICE_TABLE(i2c, max7300_id);
  60
  61 static struct i2c_driver max7300_driver = {
  62         .driver = {
  63                 .name = "max7300",
  64         },
  65         .probe = max7300_probe,
  66         .remove = max7300_remove,
  67         .id_table = max7300_id,
  68 };
  69
  70 static int __init max7300_init(void)
  71 {
  72         return i2c_add_driver(&max7300_driver);
  73 }
  74 subsys_initcall(max7300_init);
  75
  76 static void __exit max7300_exit(void)
  77 {
  78         i2c_del_driver(&max7300_driver);
  79 }
  80 module_exit(max7300_exit);
  81
  82 MODULE_AUTHOR("Wolfram Sang");
  83 MODULE_LICENSE("GPL v2");
  84 MODULE_DESCRIPTION("MAX7300 GPIO-Expander");