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-wcd934x.c (3186B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2019, Linaro Limited
      3
      4#include <linux/module.h>
      5#include <linux/gpio/driver.h>
      6#include <linux/regmap.h>
      7#include <linux/slab.h>
      8#include <linux/of_device.h>
      9
     10#define WCD_PIN_MASK(p) BIT(p)
     11#define WCD_REG_DIR_CTL_OFFSET 0x42
     12#define WCD_REG_VAL_CTL_OFFSET 0x43
     13#define WCD934X_NPINS		5
     14
     15struct wcd_gpio_data {
     16	struct regmap *map;
     17	struct gpio_chip chip;
     18};
     19
     20static int wcd_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
     21{
     22	struct wcd_gpio_data *data = gpiochip_get_data(chip);
     23	unsigned int value;
     24	int ret;
     25
     26	ret = regmap_read(data->map, WCD_REG_DIR_CTL_OFFSET, &value);
     27	if (ret < 0)
     28		return ret;
     29
     30	if (value & WCD_PIN_MASK(pin))
     31		return GPIO_LINE_DIRECTION_OUT;
     32
     33	return GPIO_LINE_DIRECTION_IN;
     34}
     35
     36static int wcd_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
     37{
     38	struct wcd_gpio_data *data = gpiochip_get_data(chip);
     39
     40	return regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
     41				  WCD_PIN_MASK(pin), 0);
     42}
     43
     44static int wcd_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
     45				     int val)
     46{
     47	struct wcd_gpio_data *data = gpiochip_get_data(chip);
     48
     49	regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
     50			   WCD_PIN_MASK(pin), WCD_PIN_MASK(pin));
     51
     52	return regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET,
     53				  WCD_PIN_MASK(pin),
     54				  val ? WCD_PIN_MASK(pin) : 0);
     55}
     56
     57static int wcd_gpio_get(struct gpio_chip *chip, unsigned int pin)
     58{
     59	struct wcd_gpio_data *data = gpiochip_get_data(chip);
     60	unsigned int value;
     61
     62	regmap_read(data->map, WCD_REG_VAL_CTL_OFFSET, &value);
     63
     64	return !!(value & WCD_PIN_MASK(pin));
     65}
     66
     67static void wcd_gpio_set(struct gpio_chip *chip, unsigned int pin, int val)
     68{
     69	struct wcd_gpio_data *data = gpiochip_get_data(chip);
     70
     71	regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET,
     72			   WCD_PIN_MASK(pin), val ? WCD_PIN_MASK(pin) : 0);
     73}
     74
     75static int wcd_gpio_probe(struct platform_device *pdev)
     76{
     77	struct device *dev = &pdev->dev;
     78	struct wcd_gpio_data *data;
     79	struct gpio_chip *chip;
     80
     81	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
     82	if (!data)
     83		return -ENOMEM;
     84
     85	data->map = dev_get_regmap(dev->parent, NULL);
     86	if (!data->map) {
     87		dev_err(dev, "%s: failed to get regmap\n", __func__);
     88		return  -EINVAL;
     89	}
     90
     91	chip = &data->chip;
     92	chip->direction_input  = wcd_gpio_direction_input;
     93	chip->direction_output = wcd_gpio_direction_output;
     94	chip->get_direction = wcd_gpio_get_direction;
     95	chip->get = wcd_gpio_get;
     96	chip->set = wcd_gpio_set;
     97	chip->parent = dev;
     98	chip->base = -1;
     99	chip->ngpio = WCD934X_NPINS;
    100	chip->label = dev_name(dev);
    101	chip->of_gpio_n_cells = 2;
    102	chip->can_sleep = false;
    103
    104	return devm_gpiochip_add_data(dev, chip, data);
    105}
    106
    107static const struct of_device_id wcd_gpio_of_match[] = {
    108	{ .compatible = "qcom,wcd9340-gpio" },
    109	{ .compatible = "qcom,wcd9341-gpio" },
    110	{ }
    111};
    112MODULE_DEVICE_TABLE(of, wcd_gpio_of_match);
    113
    114static struct platform_driver wcd_gpio_driver = {
    115	.driver = {
    116		   .name = "wcd934x-gpio",
    117		   .of_match_table = wcd_gpio_of_match,
    118	},
    119	.probe = wcd_gpio_probe,
    120};
    121
    122module_platform_driver(wcd_gpio_driver);
    123MODULE_DESCRIPTION("Qualcomm Technologies, Inc WCD GPIO control driver");
    124MODULE_LICENSE("GPL v2");