mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 17:06:40 +07:00
1d2b2ac05a
The GPIO input status was read from control register (AXP20X_GPIO[210]_CTRL) instead of status register (AXP20X_GPIO20_SS). Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
189 lines
4.4 KiB
C
189 lines
4.4 KiB
C
/*
|
|
* AXP20x GPIO driver
|
|
*
|
|
* Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/device.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/axp20x.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define AXP20X_GPIO_FUNCTIONS 0x7
|
|
#define AXP20X_GPIO_FUNCTION_OUT_LOW 0
|
|
#define AXP20X_GPIO_FUNCTION_OUT_HIGH 1
|
|
#define AXP20X_GPIO_FUNCTION_INPUT 2
|
|
|
|
struct axp20x_gpio {
|
|
struct gpio_chip chip;
|
|
struct regmap *regmap;
|
|
};
|
|
|
|
static int axp20x_gpio_get_reg(unsigned offset)
|
|
{
|
|
switch (offset) {
|
|
case 0:
|
|
return AXP20X_GPIO0_CTRL;
|
|
case 1:
|
|
return AXP20X_GPIO1_CTRL;
|
|
case 2:
|
|
return AXP20X_GPIO2_CTRL;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct axp20x_gpio *gpio = gpiochip_get_data(chip);
|
|
int reg;
|
|
|
|
reg = axp20x_gpio_get_reg(offset);
|
|
if (reg < 0)
|
|
return reg;
|
|
|
|
return regmap_update_bits(gpio->regmap, reg,
|
|
AXP20X_GPIO_FUNCTIONS,
|
|
AXP20X_GPIO_FUNCTION_INPUT);
|
|
}
|
|
|
|
static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct axp20x_gpio *gpio = gpiochip_get_data(chip);
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_read(gpio->regmap, AXP20X_GPIO20_SS, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return !!(val & BIT(offset + 4));
|
|
}
|
|
|
|
static int axp20x_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct axp20x_gpio *gpio = gpiochip_get_data(chip);
|
|
unsigned int val;
|
|
int reg, ret;
|
|
|
|
reg = axp20x_gpio_get_reg(offset);
|
|
if (reg < 0)
|
|
return reg;
|
|
|
|
ret = regmap_read(gpio->regmap, reg, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* This shouldn't really happen if the pin is in use already,
|
|
* or if it's not in use yet, it doesn't matter since we're
|
|
* going to change the value soon anyway. Default to output.
|
|
*/
|
|
if ((val & AXP20X_GPIO_FUNCTIONS) > 2)
|
|
return 0;
|
|
|
|
/*
|
|
* The GPIO directions are the three lowest values.
|
|
* 2 is input, 0 and 1 are output
|
|
*/
|
|
return val & 2;
|
|
}
|
|
|
|
static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset,
|
|
int value)
|
|
{
|
|
struct axp20x_gpio *gpio = gpiochip_get_data(chip);
|
|
int reg;
|
|
|
|
reg = axp20x_gpio_get_reg(offset);
|
|
if (reg < 0)
|
|
return reg;
|
|
|
|
return regmap_update_bits(gpio->regmap, reg,
|
|
AXP20X_GPIO_FUNCTIONS,
|
|
value ? AXP20X_GPIO_FUNCTION_OUT_HIGH
|
|
: AXP20X_GPIO_FUNCTION_OUT_LOW);
|
|
}
|
|
|
|
static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset,
|
|
int value)
|
|
{
|
|
axp20x_gpio_output(chip, offset, value);
|
|
}
|
|
|
|
static int axp20x_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
|
|
struct axp20x_gpio *gpio;
|
|
int ret;
|
|
|
|
if (!of_device_is_available(pdev->dev.of_node))
|
|
return -ENODEV;
|
|
|
|
if (!axp20x) {
|
|
dev_err(&pdev->dev, "Parent drvdata not set\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
gpio->chip.base = -1;
|
|
gpio->chip.can_sleep = true;
|
|
gpio->chip.parent = &pdev->dev;
|
|
gpio->chip.label = dev_name(&pdev->dev);
|
|
gpio->chip.owner = THIS_MODULE;
|
|
gpio->chip.get = axp20x_gpio_get;
|
|
gpio->chip.get_direction = axp20x_gpio_get_direction;
|
|
gpio->chip.set = axp20x_gpio_set;
|
|
gpio->chip.direction_input = axp20x_gpio_input;
|
|
gpio->chip.direction_output = axp20x_gpio_output;
|
|
gpio->chip.ngpio = 3;
|
|
|
|
gpio->regmap = axp20x->regmap;
|
|
|
|
ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to register GPIO chip\n");
|
|
return ret;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id axp20x_gpio_match[] = {
|
|
{ .compatible = "x-powers,axp209-gpio" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, axp20x_gpio_match);
|
|
|
|
static struct platform_driver axp20x_gpio_driver = {
|
|
.probe = axp20x_gpio_probe,
|
|
.driver = {
|
|
.name = "axp20x-gpio",
|
|
.of_match_table = axp20x_gpio_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(axp20x_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
MODULE_DESCRIPTION("AXP20x PMIC GPIO driver");
|
|
MODULE_LICENSE("GPL");
|