target/linux/adm5120/files/drivers/i2c/busses/i2c-gpio-custom.c

   1 /*
   2  *  Custom GPIO-based I2C driver
   3  *
   4  *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2 as
   8  *  published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15
  16 #include <linux/i2c-gpio.h>
  17
  18 #define DRV_NAME        "i2c-gpio-custom"
  19 #define DRV_DESC        "Custom GPIO I2C device driver"
  20
  21 static unsigned int sda = CONFIG_I2C_GPIO_CUSTOM_SDA;
  22 static unsigned int scl = CONFIG_I2C_GPIO_CUSTOM_SCL;
  23 static int id = CONFIG_I2C_GPIO_CUSTOM_DEVICE_ID;
  24
  25 module_param(sda, uint, S_IRUGO);
  26 MODULE_PARM_DESC(sda, "GPIO pin for SDA");
  27
  28 module_param(scl, uint, S_IRUGO);
  29 MODULE_PARM_DESC(scl, "GPIO pin for SCL");
  30
  31 module_param(id, int, S_IRUGO);
  32 MODULE_PARM_DESC(id, "device id of the i2c-gpio device");
  33
  34 static struct i2c_gpio_platform_data i2c_data;
  35 static struct platform_device i2c_device;
  36
  37 static void i2c_gpio_custom_release(struct platform_device *pdev)
  38 {
  39         /* nothing to do */
  40 }
  41
  42 static int __init i2c_gpio_custom_init(void)
  43 {
  44         int err;
  45
  46         i2c_data.sda_pin = sda;
  47         i2c_data.scl_pin = scl;
  48
  49         i2c_device.name = "i2c-gpio";
  50         i2c_device.id   = id;
  51
  52         i2c_device.dev.platform_data    = &i2c_data,
  53         i2c_device.dev.release          = i2c_gpio_custom_release,
  54
  55         err = platform_device_register(&i2c_device);
  56
  57         return err;
  58 }
  59
  60 static void __exit i2c_gpio_custom_exit(void)
  61 {
  62         platform_device_unregister(&i2c_device);
  63 }
  64
  65 module_init(i2c_gpio_custom_init);
  66 module_exit(i2c_gpio_custom_exit);
  67
  68 MODULE_LICENSE("GPL v2");
  69 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org >");
  70 MODULE_DESCRIPTION(DRV_DESC);
  71