drivers/gpio/gpio-ucb1400.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Philips UCB1400 GPIO driver
   4  *
   5  * Author: Marek Vasut <marek.vasut@gmail.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/ucb1400.h>
  10
  11 static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
  12 {
  13         struct ucb1400_gpio *gpio;
  14         gpio = gpiochip_get_data(gc);
  15         ucb1400_gpio_set_direction(gpio->ac97, off, 0);
  16         return 0;
  17 }
  18
  19 static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
  20 {
  21         struct ucb1400_gpio *gpio;
  22         gpio = gpiochip_get_data(gc);
  23         ucb1400_gpio_set_direction(gpio->ac97, off, 1);
  24         ucb1400_gpio_set_value(gpio->ac97, off, val);
  25         return 0;
  26 }
  27
  28 static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
  29 {
  30         struct ucb1400_gpio *gpio;
  31
  32         gpio = gpiochip_get_data(gc);
  33         return !!ucb1400_gpio_get_value(gpio->ac97, off);
  34 }
  35
  36 static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
  37 {
  38         struct ucb1400_gpio *gpio;
  39         gpio = gpiochip_get_data(gc);
  40         ucb1400_gpio_set_value(gpio->ac97, off, val);
  41 }
  42
  43 static int ucb1400_gpio_probe(struct platform_device *dev)
  44 {
  45         struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
  46         int err = 0;
  47
  48         if (!(ucb && ucb->gpio_offset)) {
  49                 err = -EINVAL;
  50                 goto err;
  51         }
  52
  53         platform_set_drvdata(dev, ucb);
  54
  55         ucb->gc.label = "ucb1400_gpio";
  56         ucb->gc.base = ucb->gpio_offset;
  57         ucb->gc.ngpio = 10;
  58         ucb->gc.owner = THIS_MODULE;
  59
  60         ucb->gc.direction_input = ucb1400_gpio_dir_in;
  61         ucb->gc.direction_output = ucb1400_gpio_dir_out;
  62         ucb->gc.get = ucb1400_gpio_get;
  63         ucb->gc.set = ucb1400_gpio_set;
  64         ucb->gc.can_sleep = true;
  65
  66         err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);
  67         if (err)
  68                 goto err;
  69
  70         if (ucb->gpio_setup)
  71                 err = ucb->gpio_setup(&dev->dev, ucb->gc.ngpio);
  72
  73 err:
  74         return err;
  75
  76 }
  77
  78 static int ucb1400_gpio_remove(struct platform_device *dev)
  79 {
  80         int err = 0;
  81         struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
  82
  83         if (ucb && ucb->gpio_teardown) {
  84                 err = ucb->gpio_teardown(&dev->dev, ucb->gc.ngpio);
  85                 if (err)
  86                         return err;
  87         }
  88
  89         return err;
  90 }
  91
  92 static struct platform_driver ucb1400_gpio_driver = {
  93         .probe  = ucb1400_gpio_probe,
  94         .remove = ucb1400_gpio_remove,
  95         .driver = {
  96                 .name   = "ucb1400_gpio"
  97         },
  98 };
  99
 100 module_platform_driver(ucb1400_gpio_driver);
 101
 102 MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
 103 MODULE_LICENSE("GPL");
 104 MODULE_ALIAS("platform:ucb1400_gpio");