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-tps65086.c (3113B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
      4 *	Andrew F. Davis <afd@ti.com>
      5 *
      6 * Based on the TPS65912 driver
      7 */
      8
      9#include <linux/gpio/driver.h>
     10#include <linux/module.h>
     11#include <linux/platform_device.h>
     12
     13#include <linux/mfd/tps65086.h>
     14
     15struct tps65086_gpio {
     16	struct gpio_chip chip;
     17	struct tps65086 *tps;
     18};
     19
     20static int tps65086_gpio_get_direction(struct gpio_chip *chip,
     21				       unsigned offset)
     22{
     23	/* This device is output only */
     24	return GPIO_LINE_DIRECTION_OUT;
     25}
     26
     27static int tps65086_gpio_direction_input(struct gpio_chip *chip,
     28					 unsigned offset)
     29{
     30	/* This device is output only */
     31	return -EINVAL;
     32}
     33
     34static int tps65086_gpio_direction_output(struct gpio_chip *chip,
     35					  unsigned offset, int value)
     36{
     37	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
     38
     39	/* Set the initial value */
     40	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
     41			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
     42
     43	return 0;
     44}
     45
     46static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
     47{
     48	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
     49	int ret, val;
     50
     51	ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
     52	if (ret < 0)
     53		return ret;
     54
     55	return val & BIT(4 + offset);
     56}
     57
     58static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
     59			      int value)
     60{
     61	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
     62
     63	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
     64			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
     65}
     66
     67static const struct gpio_chip template_chip = {
     68	.label			= "tps65086-gpio",
     69	.owner			= THIS_MODULE,
     70	.get_direction		= tps65086_gpio_get_direction,
     71	.direction_input	= tps65086_gpio_direction_input,
     72	.direction_output	= tps65086_gpio_direction_output,
     73	.get			= tps65086_gpio_get,
     74	.set			= tps65086_gpio_set,
     75	.base			= -1,
     76	.ngpio			= 4,
     77	.can_sleep		= true,
     78};
     79
     80static int tps65086_gpio_probe(struct platform_device *pdev)
     81{
     82	struct tps65086_gpio *gpio;
     83	int ret;
     84
     85	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
     86	if (!gpio)
     87		return -ENOMEM;
     88
     89	platform_set_drvdata(pdev, gpio);
     90
     91	gpio->tps = dev_get_drvdata(pdev->dev.parent);
     92	gpio->chip = template_chip;
     93	gpio->chip.parent = gpio->tps->dev;
     94
     95	ret = gpiochip_add_data(&gpio->chip, gpio);
     96	if (ret < 0) {
     97		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
     98		return ret;
     99	}
    100
    101	return 0;
    102}
    103
    104static int tps65086_gpio_remove(struct platform_device *pdev)
    105{
    106	struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
    107
    108	gpiochip_remove(&gpio->chip);
    109
    110	return 0;
    111}
    112
    113static const struct platform_device_id tps65086_gpio_id_table[] = {
    114	{ "tps65086-gpio", },
    115	{ /* sentinel */ }
    116};
    117MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
    118
    119static struct platform_driver tps65086_gpio_driver = {
    120	.driver = {
    121		.name = "tps65086-gpio",
    122	},
    123	.probe = tps65086_gpio_probe,
    124	.remove = tps65086_gpio_remove,
    125	.id_table = tps65086_gpio_id_table,
    126};
    127module_platform_driver(tps65086_gpio_driver);
    128
    129MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
    130MODULE_DESCRIPTION("TPS65086 GPIO driver");
    131MODULE_LICENSE("GPL v2");