mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
a299726da4
Define a MODULE_ALIAS() in the gpio sub-driver for max77650 so that the appropriate module gets loaded together with the core mfd driver. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Link: https://lore.kernel.org/r/20190703084601.9276-1-brgl@bgdev.pl Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
192 lines
5.0 KiB
C
192 lines
5.0 KiB
C
// 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");
|
|
MODULE_ALIAS("platform:max77650-gpio");
|