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-wm8350.c (3812B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * gpiolib support for Wolfson WM835x PMICs
      4 *
      5 * Copyright 2009 Wolfson Microelectronics PLC.
      6 *
      7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
      8 *
      9 */
     10
     11#include <linux/kernel.h>
     12#include <linux/slab.h>
     13#include <linux/module.h>
     14#include <linux/gpio/driver.h>
     15#include <linux/mfd/core.h>
     16#include <linux/platform_device.h>
     17#include <linux/seq_file.h>
     18
     19#include <linux/mfd/wm8350/core.h>
     20#include <linux/mfd/wm8350/gpio.h>
     21
     22struct wm8350_gpio_data {
     23	struct wm8350 *wm8350;
     24	struct gpio_chip gpio_chip;
     25};
     26
     27static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
     28{
     29	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
     30	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
     31
     32	return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
     33			       1 << offset);
     34}
     35
     36static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
     37{
     38	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
     39	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
     40	int ret;
     41
     42	ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
     43	if (ret < 0)
     44		return ret;
     45
     46	if (ret & (1 << offset))
     47		return 1;
     48	else
     49		return 0;
     50}
     51
     52static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
     53{
     54	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
     55	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
     56
     57	if (value)
     58		wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
     59	else
     60		wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
     61}
     62
     63static int wm8350_gpio_direction_out(struct gpio_chip *chip,
     64				     unsigned offset, int value)
     65{
     66	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
     67	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
     68	int ret;
     69
     70	ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
     71				1 << offset);
     72	if (ret < 0)
     73		return ret;
     74
     75	/* Don't have an atomic direction/value setup */
     76	wm8350_gpio_set(chip, offset, value);
     77
     78	return 0;
     79}
     80
     81static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
     82{
     83	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
     84	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
     85
     86	if (!wm8350->irq_base)
     87		return -EINVAL;
     88
     89	return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
     90}
     91
     92static const struct gpio_chip template_chip = {
     93	.label			= "wm8350",
     94	.owner			= THIS_MODULE,
     95	.direction_input	= wm8350_gpio_direction_in,
     96	.get			= wm8350_gpio_get,
     97	.direction_output	= wm8350_gpio_direction_out,
     98	.set			= wm8350_gpio_set,
     99	.to_irq			= wm8350_gpio_to_irq,
    100	.can_sleep		= true,
    101};
    102
    103static int wm8350_gpio_probe(struct platform_device *pdev)
    104{
    105	struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
    106	struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
    107	struct wm8350_gpio_data *wm8350_gpio;
    108
    109	wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
    110				   GFP_KERNEL);
    111	if (wm8350_gpio == NULL)
    112		return -ENOMEM;
    113
    114	wm8350_gpio->wm8350 = wm8350;
    115	wm8350_gpio->gpio_chip = template_chip;
    116	wm8350_gpio->gpio_chip.ngpio = 13;
    117	wm8350_gpio->gpio_chip.parent = &pdev->dev;
    118	if (pdata && pdata->gpio_base)
    119		wm8350_gpio->gpio_chip.base = pdata->gpio_base;
    120	else
    121		wm8350_gpio->gpio_chip.base = -1;
    122
    123	return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio);
    124}
    125
    126static struct platform_driver wm8350_gpio_driver = {
    127	.driver.name	= "wm8350-gpio",
    128	.probe		= wm8350_gpio_probe,
    129};
    130
    131static int __init wm8350_gpio_init(void)
    132{
    133	return platform_driver_register(&wm8350_gpio_driver);
    134}
    135subsys_initcall(wm8350_gpio_init);
    136
    137static void __exit wm8350_gpio_exit(void)
    138{
    139	platform_driver_unregister(&wm8350_gpio_driver);
    140}
    141module_exit(wm8350_gpio_exit);
    142
    143MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
    144MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
    145MODULE_LICENSE("GPL");
    146MODULE_ALIAS("platform:wm8350-gpio");