drivers/gpio/gpio-ucb1400.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 static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
  16 {
  17         struct ucb1400_gpio *gpio;
  18         gpio = gpiochip_get_data(gc);
  19         ucb1400_gpio_set_direction(gpio->ac97, off, 0);
  20         return 0;
  21 }
  22
  23 static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
  24 {
  25         struct ucb1400_gpio *gpio;
  26         gpio = gpiochip_get_data(gc);
  27         ucb1400_gpio_set_direction(gpio->ac97, off, 1);
  28         ucb1400_gpio_set_value(gpio->ac97, off, val);
  29         return 0;
  30 }
  31
  32 static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
  33 {
  34         struct ucb1400_gpio *gpio;
  35
  36         gpio = gpiochip_get_data(gc);
  37         return !!ucb1400_gpio_get_value(gpio->ac97, off);
  38 }
  39
  40 static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
  41 {
  42         struct ucb1400_gpio *gpio;
  43         gpio = gpiochip_get_data(gc);
  44         ucb1400_gpio_set_value(gpio->ac97, off, val);
  45 }
  46
  47 static int ucb1400_gpio_probe(struct platform_device *dev)
  48 {
  49         struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
  50         int err = 0;
  51
  52         if (!(ucb && ucb->gpio_offset)) {
  53                 err = -EINVAL;
  54                 goto err;
  55         }
  56
  57         platform_set_drvdata(dev, ucb);
  58
  59         ucb->gc.label = "ucb1400_gpio";
  60         ucb->gc.base = ucb->gpio_offset;
  61         ucb->gc.ngpio = 10;
  62         ucb->gc.owner = THIS_MODULE;
  63
  64         ucb->gc.direction_input = ucb1400_gpio_dir_in;
  65         ucb->gc.direction_output = ucb1400_gpio_dir_out;
  66         ucb->gc.get = ucb1400_gpio_get;
  67         ucb->gc.set = ucb1400_gpio_set;
  68         ucb->gc.can_sleep = true;
  69
  70         err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);
  71         if (err)
  72                 goto err;
  73
  74         if (ucb->gpio_setup)
  75                 err = ucb->gpio_setup(&dev->dev, ucb->gc.ngpio);
  76
  77 err:
  78         return err;
  79
  80 }
  81
  82 static int ucb1400_gpio_remove(struct platform_device *dev)
  83 {
  84         int err = 0;
  85         struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
  86
  87         if (ucb && ucb->gpio_teardown) {
  88                 err = ucb->gpio_teardown(&dev->dev, ucb->gc.ngpio);
  89                 if (err)
  90                         return err;
  91         }
  92
  93         return err;
  94 }
  95
  96 static struct platform_driver ucb1400_gpio_driver = {
  97         .probe  = ucb1400_gpio_probe,
  98         .remove = ucb1400_gpio_remove,
  99         .driver = {
 100                 .name   = "ucb1400_gpio"
 101         },
 102 };
 103
 104 module_platform_driver(ucb1400_gpio_driver);
 105
 106 MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
 107 MODULE_LICENSE("GPL");
 108 MODULE_ALIAS("platform:ucb1400_gpio");