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- // SPDX-License-Identifier: GPL-2.0-only
- // Copyright (C) 2018 ROHM Semiconductors
- #include <linux/gpio/driver.h>
- #include <linux/mfd/rohm-bd71828.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- #define GPIO_OUT_REG(off) (BD71828_REG_GPIO_CTRL1 + (off))
- #define HALL_GPIO_OFFSET 3
- struct bd71828_gpio {
- struct rohm_regmap_dev chip;
- struct gpio_chip gpio;
- };
- static void bd71828_gpio_set(struct gpio_chip *chip, unsigned int offset,
- int value)
- {
- int ret;
- struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
- u8 val = (value) ? BD71828_GPIO_OUT_HI : BD71828_GPIO_OUT_LO;
- /*
- * The HALL input pin can only be used as input. If this is the pin
- * we are dealing with - then we are done
- */
- if (offset == HALL_GPIO_OFFSET)
- return;
- ret = regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
- BD71828_GPIO_OUT_MASK, val);
- if (ret)
- dev_err(bdgpio->chip.dev, "Could not set gpio to %d\n", value);
- }
- static int bd71828_gpio_get(struct gpio_chip *chip, unsigned int offset)
- {
- int ret;
- unsigned int val;
- struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
- if (offset == HALL_GPIO_OFFSET)
- ret = regmap_read(bdgpio->chip.regmap, BD71828_REG_IO_STAT,
- &val);
- else
- ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
- &val);
- if (!ret)
- ret = (val & BD71828_GPIO_OUT_MASK);
- return ret;
- }
- static int bd71828_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
- unsigned long config)
- {
- struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
- if (offset == HALL_GPIO_OFFSET)
- return -ENOTSUPP;
- switch (pinconf_to_config_param(config)) {
- case PIN_CONFIG_DRIVE_OPEN_DRAIN:
- return regmap_update_bits(bdgpio->chip.regmap,
- GPIO_OUT_REG(offset),
- BD71828_GPIO_DRIVE_MASK,
- BD71828_GPIO_OPEN_DRAIN);
- case PIN_CONFIG_DRIVE_PUSH_PULL:
- return regmap_update_bits(bdgpio->chip.regmap,
- GPIO_OUT_REG(offset),
- BD71828_GPIO_DRIVE_MASK,
- BD71828_GPIO_PUSH_PULL);
- default:
- break;
- }
- return -ENOTSUPP;
- }
- static int bd71828_get_direction(struct gpio_chip *chip, unsigned int offset)
- {
- /*
- * Pin usage is selected by OTP data. We can't read it runtime. Hence
- * we trust that if the pin is not excluded by "gpio-reserved-ranges"
- * the OTP configuration is set to OUT. (Other pins but HALL input pin
- * on BD71828 can't really be used for general purpose input - input
- * states are used for specific cases like regulator control or
- * PMIC_ON_REQ.
- */
- if (offset == HALL_GPIO_OFFSET)
- return GPIO_LINE_DIRECTION_IN;
- return GPIO_LINE_DIRECTION_OUT;
- }
- static int bd71828_probe(struct platform_device *pdev)
- {
- struct bd71828_gpio *bdgpio;
- struct rohm_regmap_dev *bd71828;
- bd71828 = dev_get_drvdata(pdev->dev.parent);
- if (!bd71828) {
- 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 = "bd71828-gpio";
- bdgpio->gpio.owner = THIS_MODULE;
- bdgpio->gpio.get_direction = bd71828_get_direction;
- bdgpio->gpio.set_config = bd71828_gpio_set_config;
- bdgpio->gpio.can_sleep = true;
- bdgpio->gpio.get = bd71828_gpio_get;
- bdgpio->gpio.set = bd71828_gpio_set;
- bdgpio->gpio.base = -1;
- /*
- * See if we need some implementation to mark some PINs as
- * not controllable based on DT info or if core can handle
- * "gpio-reserved-ranges" and exclude them from control
- */
- bdgpio->gpio.ngpio = 4;
- bdgpio->gpio.of_node = pdev->dev.parent->of_node;
- bdgpio->chip.regmap = bd71828->regmap;
- return devm_gpiochip_add_data(&pdev->dev, &bdgpio->gpio,
- bdgpio);
- }
- static struct platform_driver bd71828_gpio = {
- .driver = {
- .name = "bd71828-gpio"
- },
- .probe = bd71828_probe,
- };
- module_platform_driver(bd71828_gpio);
- MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
- MODULE_DESCRIPTION("BD71828 voltage regulator driver");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:bd71828-gpio");
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