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- // SPDX-License-Identifier: GPL-2.0
- // Copyright (C) 2018 ROHM Semiconductors
- // gpio-bd70528.c ROHM BD70528MWV gpio driver
- #include <linux/gpio/driver.h>
- #include <linux/mfd/rohm-bd70528.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- #define GPIO_IN_REG(offset) (BD70528_REG_GPIO1_IN + (offset) * 2)
- #define GPIO_OUT_REG(offset) (BD70528_REG_GPIO1_OUT + (offset) * 2)
- struct bd70528_gpio {
- struct rohm_regmap_dev chip;
- struct gpio_chip gpio;
- };
- static int bd70528_set_debounce(struct bd70528_gpio *bdgpio,
- unsigned int offset, unsigned int debounce)
- {
- u8 val;
- switch (debounce) {
- case 0:
- val = BD70528_DEBOUNCE_DISABLE;
- break;
- case 1 ... 15000:
- val = BD70528_DEBOUNCE_15MS;
- break;
- case 15001 ... 30000:
- val = BD70528_DEBOUNCE_30MS;
- break;
- case 30001 ... 50000:
- val = BD70528_DEBOUNCE_50MS;
- break;
- default:
- dev_err(bdgpio->chip.dev,
- "Invalid debounce value %u\n", debounce);
- return -EINVAL;
- }
- return regmap_update_bits(bdgpio->chip.regmap, GPIO_IN_REG(offset),
- BD70528_DEBOUNCE_MASK, val);
- }
- static int bd70528_get_direction(struct gpio_chip *chip, unsigned int offset)
- {
- struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
- int val, ret;
- /* Do we need to do something to IRQs here? */
- ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset), &val);
- if (ret) {
- dev_err(bdgpio->chip.dev, "Could not read gpio direction\n");
- return ret;
- }
- if (val & BD70528_GPIO_OUT_EN_MASK)
- return GPIO_LINE_DIRECTION_OUT;
- return GPIO_LINE_DIRECTION_IN;
- }
- static int bd70528_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
- unsigned long config)
- {
- struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
- switch (pinconf_to_config_param(config)) {
- case PIN_CONFIG_DRIVE_OPEN_DRAIN:
- return regmap_update_bits(bdgpio->chip.regmap,
- GPIO_OUT_REG(offset),
- BD70528_GPIO_DRIVE_MASK,
- BD70528_GPIO_OPEN_DRAIN);
- break;
- case PIN_CONFIG_DRIVE_PUSH_PULL:
- return regmap_update_bits(bdgpio->chip.regmap,
- GPIO_OUT_REG(offset),
- BD70528_GPIO_DRIVE_MASK,
- BD70528_GPIO_PUSH_PULL);
- break;
- case PIN_CONFIG_INPUT_DEBOUNCE:
- return bd70528_set_debounce(bdgpio, offset,
- pinconf_to_config_argument(config));
- break;
- default:
- break;
- }
- return -ENOTSUPP;
- }
- static int bd70528_direction_input(struct gpio_chip *chip, unsigned int offset)
- {
- struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
- /* Do we need to do something to IRQs here? */
- return regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
- BD70528_GPIO_OUT_EN_MASK,
- BD70528_GPIO_OUT_DISABLE);
- }
- static void bd70528_gpio_set(struct gpio_chip *chip, unsigned int offset,
- int value)
- {
- int ret;
- struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
- u8 val = (value) ? BD70528_GPIO_OUT_HI : BD70528_GPIO_OUT_LO;
- ret = regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
- BD70528_GPIO_OUT_MASK, val);
- if (ret)
- dev_err(bdgpio->chip.dev, "Could not set gpio to %d\n", value);
- }
- static int bd70528_direction_output(struct gpio_chip *chip, unsigned int offset,
- int value)
- {
- struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
- bd70528_gpio_set(chip, offset, value);
- return regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
- BD70528_GPIO_OUT_EN_MASK,
- BD70528_GPIO_OUT_ENABLE);
- }
- #define GPIO_IN_STATE_MASK(offset) (BD70528_GPIO_IN_STATE_BASE << (offset))
- static int bd70528_gpio_get_o(struct bd70528_gpio *bdgpio, unsigned int offset)
- {
- int ret;
- unsigned int val;
- ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset), &val);
- if (!ret)
- ret = !!(val & BD70528_GPIO_OUT_MASK);
- else
- dev_err(bdgpio->chip.dev, "GPIO (out) state read failed\n");
- return ret;
- }
- static int bd70528_gpio_get_i(struct bd70528_gpio *bdgpio, unsigned int offset)
- {
- unsigned int val;
- int ret;
- ret = regmap_read(bdgpio->chip.regmap, BD70528_REG_GPIO_STATE, &val);
- if (!ret)
- ret = !(val & GPIO_IN_STATE_MASK(offset));
- else
- dev_err(bdgpio->chip.dev, "GPIO (in) state read failed\n");
- return ret;
- }
- static int bd70528_gpio_get(struct gpio_chip *chip, unsigned int offset)
- {
- int ret;
- struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
- /*
- * There is a race condition where someone might be changing the
- * GPIO direction after we get it but before we read the value. But
- * application design where GPIO direction may be changed just when
- * we read GPIO value would be pointless as reader could not know
- * whether the returned high/low state is caused by input or output.
- * Or then there must be other ways to mitigate the issue. Thus
- * locking would make no sense.
- */
- ret = bd70528_get_direction(chip, offset);
- if (ret == GPIO_LINE_DIRECTION_OUT)
- ret = bd70528_gpio_get_o(bdgpio, offset);
- else if (ret == GPIO_LINE_DIRECTION_IN)
- ret = bd70528_gpio_get_i(bdgpio, offset);
- else
- dev_err(bdgpio->chip.dev, "failed to read GPIO direction\n");
- return ret;
- }
- static int bd70528_probe(struct platform_device *pdev)
- {
- struct bd70528_gpio *bdgpio;
- struct rohm_regmap_dev *bd70528;
- int ret;
- bd70528 = dev_get_drvdata(pdev->dev.parent);
- if (!bd70528) {
- dev_err(&pdev->dev, "No MFD driver data\n");
- return -EINVAL;
- }
- bdgpio = devm_kzalloc(&pdev->dev, sizeof(*bdgpio),
- GFP_KERNEL);
- if (!bdgpio)
- return -ENOMEM;
- bdgpio->chip.dev = &pdev->dev;
- bdgpio->gpio.parent = pdev->dev.parent;
- bdgpio->gpio.label = "bd70528-gpio";
- bdgpio->gpio.owner = THIS_MODULE;
- bdgpio->gpio.get_direction = bd70528_get_direction;
- bdgpio->gpio.direction_input = bd70528_direction_input;
- bdgpio->gpio.direction_output = bd70528_direction_output;
- bdgpio->gpio.set_config = bd70528_gpio_set_config;
- bdgpio->gpio.can_sleep = true;
- bdgpio->gpio.get = bd70528_gpio_get;
- bdgpio->gpio.set = bd70528_gpio_set;
- bdgpio->gpio.ngpio = 4;
- bdgpio->gpio.base = -1;
- #ifdef CONFIG_OF_GPIO
- bdgpio->gpio.of_node = pdev->dev.parent->of_node;
- #endif
- bdgpio->chip.regmap = bd70528->regmap;
- ret = devm_gpiochip_add_data(&pdev->dev, &bdgpio->gpio,
- bdgpio);
- if (ret)
- dev_err(&pdev->dev, "gpio_init: Failed to add bd70528-gpio\n");
- return ret;
- }
- static struct platform_driver bd70528_gpio = {
- .driver = {
- .name = "bd70528-gpio"
- },
- .probe = bd70528_probe,
- };
- module_platform_driver(bd70528_gpio);
- MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
- MODULE_DESCRIPTION("BD70528 voltage regulator driver");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:bd70528-gpio");
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