drivers/gpio/ucb1400_gpio.c

   1 /*
   2  * Philips UCB1400 GPIO driver
   3  *
   4  * Author: Marek Vasut <marek.vasut@gmail.com>
   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
  12 #include <linux/module.h>
  13 #include <linux/ucb1400.h>
  14
  15 struct ucb1400_gpio_data *ucbdata;
  16
  17 static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
  18 {
  19         struct ucb1400_gpio *gpio;
  20         gpio = container_of(gc, struct ucb1400_gpio, gc);
  21         ucb1400_gpio_set_direction(gpio->ac97, off, 0);
  22         return 0;
  23 }
  24
  25 static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
  26 {
  27         struct ucb1400_gpio *gpio;
  28         gpio = container_of(gc, struct ucb1400_gpio, gc);
  29         ucb1400_gpio_set_direction(gpio->ac97, off, 1);
  30         ucb1400_gpio_set_value(gpio->ac97, off, val);
  31         return 0;
  32 }
  33
  34 static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
  35 {
  36         struct ucb1400_gpio *gpio;
  37         gpio = container_of(gc, struct ucb1400_gpio, gc);
  38         return ucb1400_gpio_get_value(gpio->ac97, off);
  39 }
  40
  41 static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
  42 {
  43         struct ucb1400_gpio *gpio;
  44         gpio = container_of(gc, struct ucb1400_gpio, gc);
  45         ucb1400_gpio_set_value(gpio->ac97, off, val);
  46 }
  47
  48 static int ucb1400_gpio_probe(struct platform_device *dev)
  49 {
  50         struct ucb1400_gpio *ucb = dev->dev.platform_data;
  51         int err = 0;
  52
  53         if (!(ucbdata && ucbdata->gpio_offset)) {
  54                 err = -EINVAL;
  55                 goto err;
  56         }
  57
  58         platform_set_drvdata(dev, ucb);
  59
  60         ucb->gc.label = "ucb1400_gpio";
  61         ucb->gc.base = ucbdata->gpio_offset;
  62         ucb->gc.ngpio = 10;
  63         ucb->gc.owner = THIS_MODULE;
  64
  65         ucb->gc.direction_input = ucb1400_gpio_dir_in;
  66         ucb->gc.direction_output = ucb1400_gpio_dir_out;
  67         ucb->gc.get = ucb1400_gpio_get;
  68         ucb->gc.set = ucb1400_gpio_set;
  69         ucb->gc.can_sleep = 1;
  70
  71         err = gpiochip_add(&ucb->gc);
  72         if (err)
  73                 goto err;
  74
  75         if (ucbdata && ucbdata->gpio_setup)
  76                 err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio);
  77
  78 err:
  79         return err;
  80
  81 }
  82
  83 static int ucb1400_gpio_remove(struct platform_device *dev)
  84 {
  85         int err = 0;
  86         struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
  87
  88         if (ucbdata && ucbdata->gpio_teardown) {
  89                 err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio);
  90                 if (err)
  91                         return err;
  92         }
  93
  94         err = gpiochip_remove(&ucb->gc);
  95         return err;
  96 }
  97
  98 static struct platform_driver ucb1400_gpio_driver = {
  99         .probe  = ucb1400_gpio_probe,
 100         .remove = ucb1400_gpio_remove,
 101         .driver = {
 102                 .name   = "ucb1400_gpio"
 103         },
 104 };
 105
 106 static int __init ucb1400_gpio_init(void)
 107 {
 108         return platform_driver_register(&ucb1400_gpio_driver);
 109 }
 110
 111 static void __exit ucb1400_gpio_exit(void)
 112 {
 113         platform_driver_unregister(&ucb1400_gpio_driver);
 114 }
 115
 116 void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data)
 117 {
 118         ucbdata = data;
 119 }
 120
 121 module_init(ucb1400_gpio_init);
 122 module_exit(ucb1400_gpio_exit);
 123
 124 MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
 125 MODULE_LICENSE("GPL");