cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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gpio-ucb1400.c (2297B)

      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
     11static 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
     19static 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
     28static 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
     36static 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
     43static 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
     73err:
     74	return err;
     75
     76}
     77
     78static 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
     92static 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
    100module_platform_driver(ucb1400_gpio_driver);
    101
    102MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
    103MODULE_LICENSE("GPL");
    104MODULE_ALIAS("platform:ucb1400_gpio");