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- // SPDX-License-Identifier: GPL-2.0
- //
- // Copyright (C) 2018 BayLibre SAS
- // Author: Bartosz Golaszewski <[email protected]>
- //
- // 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 <[email protected]>");
- MODULE_LICENSE("GPL v2");
- MODULE_ALIAS("platform:max77650-gpio");
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