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