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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 BayLibre SAS
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
//
// GPIO driver for MAXIM 77650/77651 charger/power-supply.
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/mfd/max77650.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define MAX77650_GPIO_DIR_MASK BIT(0)
#define MAX77650_GPIO_INVAL_MASK BIT(1)
#define MAX77650_GPIO_DRV_MASK BIT(2)
#define MAX77650_GPIO_OUTVAL_MASK BIT(3)
#define MAX77650_GPIO_DEBOUNCE_MASK BIT(4)
#define MAX77650_GPIO_DIR_OUT 0x00
#define MAX77650_GPIO_DIR_IN BIT(0)
#define MAX77650_GPIO_OUT_LOW 0x00
#define MAX77650_GPIO_OUT_HIGH BIT(3)
#define MAX77650_GPIO_DRV_OPEN_DRAIN 0x00
#define MAX77650_GPIO_DRV_PUSH_PULL BIT(2)
#define MAX77650_GPIO_DEBOUNCE BIT(4)
#define MAX77650_GPIO_DIR_BITS(_reg) \
((_reg) & MAX77650_GPIO_DIR_MASK)
#define MAX77650_GPIO_INVAL_BITS(_reg) \
(((_reg) & MAX77650_GPIO_INVAL_MASK) >> 1)
struct max77650_gpio_chip {
struct regmap *map;
struct gpio_chip gc;
int irq;
};
static int max77650_gpio_direction_input(struct gpio_chip *gc,
unsigned int offset)
{
struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
return regmap_update_bits(chip->map,
MAX77650_REG_CNFG_GPIO,
MAX77650_GPIO_DIR_MASK,
MAX77650_GPIO_DIR_IN);
}
static int max77650_gpio_direction_output(struct gpio_chip *gc,
unsigned int offset, int value)
{
struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
int mask, regval;
mask = MAX77650_GPIO_DIR_MASK | MAX77650_GPIO_OUTVAL_MASK;
regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
regval |= MAX77650_GPIO_DIR_OUT;
return regmap_update_bits(chip->map,
MAX77650_REG_CNFG_GPIO, mask, regval);
}
static void max77650_gpio_set_value(struct gpio_chip *gc,
unsigned int offset, int value)
{
struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
int rv, regval;
regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
rv = regmap_update_bits(chip->map, MAX77650_REG_CNFG_GPIO,
MAX77650_GPIO_OUTVAL_MASK, regval);
if (rv)
dev_err(gc->parent, "cannot set GPIO value: %d\n", rv);
}
static int max77650_gpio_get_value(struct gpio_chip *gc,
unsigned int offset)
{
struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
unsigned int val;
int rv;
rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
if (rv)
return rv;
return MAX77650_GPIO_INVAL_BITS(val);
}
static int max77650_gpio_get_direction(struct gpio_chip *gc,
unsigned int offset)
{
struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
unsigned int val;
int rv;
rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
if (rv)
return rv;
return MAX77650_GPIO_DIR_BITS(val);
}
static int max77650_gpio_set_config(struct gpio_chip *gc,
unsigned int offset, unsigned long cfg)
{
struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
switch (pinconf_to_config_param(cfg)) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
return regmap_update_bits(chip->map,
MAX77650_REG_CNFG_GPIO,
MAX77650_GPIO_DRV_MASK,
MAX77650_GPIO_DRV_OPEN_DRAIN);
case PIN_CONFIG_DRIVE_PUSH_PULL:
return regmap_update_bits(chip->map,
MAX77650_REG_CNFG_GPIO,
MAX77650_GPIO_DRV_MASK,
MAX77650_GPIO_DRV_PUSH_PULL);
case PIN_CONFIG_INPUT_DEBOUNCE:
return regmap_update_bits(chip->map,
MAX77650_REG_CNFG_GPIO,
MAX77650_GPIO_DEBOUNCE_MASK,
MAX77650_GPIO_DEBOUNCE);
default:
return -ENOTSUPP;
}
}
static int max77650_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
{
struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
return chip->irq;
}
static int max77650_gpio_probe(struct platform_device *pdev)
{
struct max77650_gpio_chip *chip;
struct device *dev, *parent;
struct i2c_client *i2c;
dev = &pdev->dev;
parent = dev->parent;
i2c = to_i2c_client(parent);
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->map = dev_get_regmap(parent, NULL);
if (!chip->map)
return -ENODEV;
chip->irq = platform_get_irq_byname(pdev, "GPI");
if (chip->irq < 0)
return chip->irq;
chip->gc.base = -1;
chip->gc.ngpio = 1;
chip->gc.label = i2c->name;
chip->gc.parent = dev;
chip->gc.owner = THIS_MODULE;
chip->gc.can_sleep = true;
chip->gc.direction_input = max77650_gpio_direction_input;
chip->gc.direction_output = max77650_gpio_direction_output;
chip->gc.set = max77650_gpio_set_value;
chip->gc.get = max77650_gpio_get_value;
chip->gc.get_direction = max77650_gpio_get_direction;
chip->gc.set_config = max77650_gpio_set_config;
chip->gc.to_irq = max77650_gpio_to_irq;
return devm_gpiochip_add_data(dev, &chip->gc, chip);
}
static struct platform_driver max77650_gpio_driver = {
.driver = {
.name = "max77650-gpio",
},
.probe = max77650_gpio_probe,
};
module_platform_driver(max77650_gpio_driver);
MODULE_DESCRIPTION("MAXIM 77650/77651 GPIO driver");
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
MODULE_LICENSE("GPL v2");
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