/*
|
* 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/axp2101.h>
|
#include <linux/module.h>
|
#include <linux/of.h>
|
#include <linux/platform_device.h>
|
#include <linux/regmap.h>
|
#include <linux/slab.h>
|
#include <linux/sunxi-gpio.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
|
|
#define AXP858_GPIO1_FUNCTIONS (0x3 << 5)
|
#define AXP858_GPIO1_FUNCTION_OUT_LOW (1 << 5)
|
#define AXP858_GPIO1_FUNCTION_OUT_HIGH (2 << 5)
|
#define AXP858_GPIO1_FUNCTION_INPUT (3 << 5)
|
#define AXP858_GPIO1_VOL_MASK 0x1f
|
#define AXP858_GPIO2_FUNCTIONS 0x7
|
#define AXP858_GPIO2_FUNCTION_OUT_LOW 1
|
#define AXP858_GPIO2_FUNCTION_OUT_HIGH 2
|
#define AXP858_GPIO2_FUNCTION_INPUT 3
|
#define AXP858_GPIO2_VOL_MASK 0x3f
|
|
#define AXP858_GPIO1_IRQ_EN (1 << 2)
|
#define AXP858_GPIO2_IRQ_EN (1 << 5)
|
|
#define AXP_GPIO_BASE 510
|
|
struct axp20x_gpio {
|
struct gpio_chip chip;
|
struct regmap *regmap;
|
};
|
|
static int axp20x_gpio_get_reg(unsigned offset)
|
{
|
switch (offset) {
|
case 0:
|
return AXP858_CLDO3_GPIO1_CTL;
|
case 1:
|
return AXP858_CLDO4_GPIO2_CTL;
|
}
|
|
return -EINVAL;
|
}
|
|
static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset)
|
{
|
struct axp20x_gpio *gpio = gpiochip_get_data(chip);
|
int reg;
|
unsigned int val;
|
|
reg = axp20x_gpio_get_reg(offset);
|
if (reg < 0)
|
return reg;
|
|
regmap_read(gpio->regmap, reg, &val);
|
val &= ~(offset ? AXP858_GPIO2_FUNCTIONS : AXP858_GPIO1_FUNCTIONS);
|
val |= (offset ? AXP858_GPIO2_FUNCTION_INPUT : AXP858_GPIO1_FUNCTION_INPUT);
|
regmap_write(gpio->regmap, reg, val);
|
return 0;
|
// return regmap_update_bits(gpio->regmap, reg,
|
// offset ? AXP858_GPIO2_FUNCTIONS : AXP858_GPIO1_FUNCTIONS,
|
// offset ?
|
// AXP858_GPIO2_FUNCTION_INPUT : AXP858_GPIO1_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 reg, ret;
|
|
reg = axp20x_gpio_get_reg(offset);
|
if (reg < 0)
|
return reg;
|
|
ret = regmap_read(gpio->regmap, reg, &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 (offset)
|
val &= AXP858_GPIO2_FUNCTIONS;
|
else
|
val = (val & AXP858_GPIO1_FUNCTIONS) >> 5;
|
|
|
/*
|
* The GPIO directions are the three lowest values.
|
* 3 is input, 1 and 2 are output
|
*/
|
return (val > 2 ? 1 : 0);
|
}
|
|
static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset,
|
int value)
|
{
|
struct axp20x_gpio *gpio = gpiochip_get_data(chip);
|
int reg;
|
unsigned int val;
|
|
reg = axp20x_gpio_get_reg(offset);
|
if (reg < 0)
|
return reg;
|
|
regmap_read(gpio->regmap, reg, &val);
|
val &= ~(offset ? AXP858_GPIO2_FUNCTIONS : AXP858_GPIO1_FUNCTIONS);
|
val |= (value ? AXP858_GPIO1_FUNCTION_OUT_HIGH : AXP858_GPIO1_FUNCTION_OUT_LOW);
|
regmap_write(gpio->regmap, reg, val);
|
return 0;
|
}
|
|
static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset,
|
int value)
|
{
|
axp20x_gpio_output(chip, offset, value);
|
}
|
|
static int axp_pinctrl_gpio_of_xlate(struct gpio_chip *gc,
|
const struct of_phandle_args *gpiospec,
|
u32 *flags)
|
{
|
struct gpio_config *config = NULL;
|
int pin;
|
|
pr_debug("%s enter... gpiospec->args[0] = %d,\"\
|
+ \" gpiospec->args[1] = %d\n",
|
__func__, gpiospec->args[0], gpiospec->args[1]);
|
|
pin = gpiospec->args[1];
|
|
if (pin > gc->ngpio)
|
return -EINVAL;
|
|
if (flags) {
|
config = (struct gpio_config *)flags;
|
config->gpio = gc->base + gpiospec->args[1];
|
config->mul_sel = gpiospec->args[2];
|
config->drv_level = gpiospec->args[3];
|
config->pull = gpiospec->args[4];
|
config->data = gpiospec->args[5];
|
}
|
|
return pin;
|
}
|
|
|
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 = AXP_GPIO_BASE;
|
gpio->chip.can_sleep = 0;
|
gpio->chip.parent = &pdev->dev;
|
gpio->chip.label = dev_name(&pdev->dev);
|
gpio->chip.owner = THIS_MODULE;
|
/* gpio->chip.request = axp_gpio_request;*/
|
/* gpio->chip.free = axp_gpio_free;*/
|
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.of_xlate = axp_pinctrl_gpio_of_xlate;
|
gpio->chip.of_gpio_n_cells = 6;
|
gpio->chip.ngpio = 2;
|
|
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, "AXP858 GPIO driver loaded\n");
|
|
return 0;
|
}
|
|
static const struct of_device_id axp20x_gpio_match[] = {
|
{ .compatible = "x-powers,axp858-gpio" },
|
{ }
|
};
|
MODULE_DEVICE_TABLE(of, axp20x_gpio_match);
|
|
static struct platform_driver axp20x_gpio_driver = {
|
.probe = axp20x_gpio_probe,
|
.driver = {
|
.name = "axp858-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");
|
