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-bd9571mwv.c (3342B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
      4 *
      5 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
      6 *
      7 * Based on the TPS65086 driver
      8 *
      9 * NOTE: Interrupts are not supported yet.
     10 */
     11
     12#include <linux/gpio/driver.h>
     13#include <linux/mfd/rohm-generic.h>
     14#include <linux/module.h>
     15#include <linux/platform_device.h>
     16
     17#include <linux/mfd/bd9571mwv.h>
     18
     19struct bd9571mwv_gpio {
     20	struct regmap *regmap;
     21	struct gpio_chip chip;
     22};
     23
     24static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
     25				       unsigned int offset)
     26{
     27	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
     28	int ret, val;
     29
     30	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
     31	if (ret < 0)
     32		return ret;
     33	if (val & BIT(offset))
     34		return GPIO_LINE_DIRECTION_IN;
     35
     36	return GPIO_LINE_DIRECTION_OUT;
     37}
     38
     39static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
     40					 unsigned int offset)
     41{
     42	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
     43
     44	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);
     45
     46	return 0;
     47}
     48
     49static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
     50					  unsigned int offset, int value)
     51{
     52	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
     53
     54	/* Set the initial value */
     55	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
     56			   BIT(offset), value ? BIT(offset) : 0);
     57	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
     58			   BIT(offset), BIT(offset));
     59
     60	return 0;
     61}
     62
     63static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
     64{
     65	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
     66	int ret, val;
     67
     68	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
     69	if (ret < 0)
     70		return ret;
     71
     72	return val & BIT(offset);
     73}
     74
     75static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
     76			      int value)
     77{
     78	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
     79
     80	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
     81			   BIT(offset), value ? BIT(offset) : 0);
     82}
     83
     84static const struct gpio_chip template_chip = {
     85	.label			= "bd9571mwv-gpio",
     86	.owner			= THIS_MODULE,
     87	.get_direction		= bd9571mwv_gpio_get_direction,
     88	.direction_input	= bd9571mwv_gpio_direction_input,
     89	.direction_output	= bd9571mwv_gpio_direction_output,
     90	.get			= bd9571mwv_gpio_get,
     91	.set			= bd9571mwv_gpio_set,
     92	.base			= -1,
     93	.ngpio			= 2,
     94	.can_sleep		= true,
     95};
     96
     97static int bd9571mwv_gpio_probe(struct platform_device *pdev)
     98{
     99	struct bd9571mwv_gpio *gpio;
    100
    101	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
    102	if (!gpio)
    103		return -ENOMEM;
    104
    105	gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
    106	gpio->chip = template_chip;
    107	gpio->chip.parent = pdev->dev.parent;
    108
    109	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
    110}
    111
    112static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
    113	{ "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
    114	{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
    115	{ /* sentinel */ }
    116};
    117MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
    118
    119static struct platform_driver bd9571mwv_gpio_driver = {
    120	.driver = {
    121		.name = "bd9571mwv-gpio",
    122	},
    123	.probe = bd9571mwv_gpio_probe,
    124	.id_table = bd9571mwv_gpio_id_table,
    125};
    126module_platform_driver(bd9571mwv_gpio_driver);
    127
    128MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
    129MODULE_DESCRIPTION("BD9571MWV GPIO driver");
    130MODULE_LICENSE("GPL v2");