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-tps65912.c (3376B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * GPIO driver for TI TPS65912x PMICs
      4 *
      5 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
      6 *	Andrew F. Davis <afd@ti.com>
      7 *
      8 * Based on the Arizona GPIO driver and the previous TPS65912 driver by
      9 * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
     10 */
     11
     12#include <linux/gpio/driver.h>
     13#include <linux/module.h>
     14#include <linux/platform_device.h>
     15
     16#include <linux/mfd/tps65912.h>
     17
     18struct tps65912_gpio {
     19	struct gpio_chip gpio_chip;
     20	struct tps65912 *tps;
     21};
     22
     23static int tps65912_gpio_get_direction(struct gpio_chip *gc,
     24				       unsigned offset)
     25{
     26	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
     27
     28	int ret, val;
     29
     30	ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
     31	if (ret)
     32		return ret;
     33
     34	if (val & GPIO_CFG_MASK)
     35		return GPIO_LINE_DIRECTION_OUT;
     36	else
     37		return GPIO_LINE_DIRECTION_IN;
     38}
     39
     40static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
     41{
     42	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
     43
     44	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
     45				  GPIO_CFG_MASK, 0);
     46}
     47
     48static int tps65912_gpio_direction_output(struct gpio_chip *gc,
     49					  unsigned offset, int value)
     50{
     51	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
     52
     53	/* Set the initial value */
     54	regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
     55			   GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
     56
     57	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
     58				  GPIO_CFG_MASK, GPIO_CFG_MASK);
     59}
     60
     61static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
     62{
     63	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
     64	int ret, val;
     65
     66	ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
     67	if (ret)
     68		return ret;
     69
     70	if (val & GPIO_STS_MASK)
     71		return 1;
     72
     73	return 0;
     74}
     75
     76static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
     77			      int value)
     78{
     79	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
     80
     81	regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
     82			   GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
     83}
     84
     85static const struct gpio_chip template_chip = {
     86	.label			= "tps65912-gpio",
     87	.owner			= THIS_MODULE,
     88	.get_direction		= tps65912_gpio_get_direction,
     89	.direction_input	= tps65912_gpio_direction_input,
     90	.direction_output	= tps65912_gpio_direction_output,
     91	.get			= tps65912_gpio_get,
     92	.set			= tps65912_gpio_set,
     93	.base			= -1,
     94	.ngpio			= 5,
     95	.can_sleep		= true,
     96};
     97
     98static int tps65912_gpio_probe(struct platform_device *pdev)
     99{
    100	struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
    101	struct tps65912_gpio *gpio;
    102
    103	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
    104	if (!gpio)
    105		return -ENOMEM;
    106
    107	gpio->tps = dev_get_drvdata(pdev->dev.parent);
    108	gpio->gpio_chip = template_chip;
    109	gpio->gpio_chip.parent = tps->dev;
    110
    111	return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio);
    112}
    113
    114static const struct platform_device_id tps65912_gpio_id_table[] = {
    115	{ "tps65912-gpio", },
    116	{ /* sentinel */ }
    117};
    118MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
    119
    120static struct platform_driver tps65912_gpio_driver = {
    121	.driver = {
    122		.name = "tps65912-gpio",
    123	},
    124	.probe = tps65912_gpio_probe,
    125	.id_table = tps65912_gpio_id_table,
    126};
    127module_platform_driver(tps65912_gpio_driver);
    128
    129MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
    130MODULE_DESCRIPTION("TPS65912 GPIO driver");
    131MODULE_LICENSE("GPL v2");