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![Bartosz Golaszewski](/assets/img/avatar_default.png)
Using a helper local variable to store the address of &pdev->dev adds to readability and allows us to avoid unnecessary line breaks. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
230 lines
6.2 KiB
C
230 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 ROHM Semiconductors
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// gpio-bd70528.c ROHM BD70528MWV gpio driver
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#include <linux/gpio/driver.h>
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#include <linux/mfd/rohm-bd70528.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_IN_REG(offset) (BD70528_REG_GPIO1_IN + (offset) * 2)
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#define GPIO_OUT_REG(offset) (BD70528_REG_GPIO1_OUT + (offset) * 2)
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struct bd70528_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 int bd70528_set_debounce(struct bd70528_gpio *bdgpio,
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unsigned int offset, unsigned int debounce)
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{
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u8 val;
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switch (debounce) {
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case 0:
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val = BD70528_DEBOUNCE_DISABLE;
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break;
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case 1 ... 15000:
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val = BD70528_DEBOUNCE_15MS;
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break;
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case 15001 ... 30000:
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val = BD70528_DEBOUNCE_30MS;
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break;
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case 30001 ... 50000:
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val = BD70528_DEBOUNCE_50MS;
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break;
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default:
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dev_err(bdgpio->dev,
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"Invalid debounce value %u\n", debounce);
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return -EINVAL;
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}
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return regmap_update_bits(bdgpio->regmap, GPIO_IN_REG(offset),
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BD70528_DEBOUNCE_MASK, val);
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}
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static int bd70528_get_direction(struct gpio_chip *chip, unsigned int offset)
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{
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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int val, ret;
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/* Do we need to do something to IRQs here? */
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ret = regmap_read(bdgpio->regmap, GPIO_OUT_REG(offset), &val);
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if (ret) {
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dev_err(bdgpio->dev, "Could not read gpio direction\n");
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return ret;
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}
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if (val & BD70528_GPIO_OUT_EN_MASK)
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return GPIO_LINE_DIRECTION_OUT;
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return GPIO_LINE_DIRECTION_IN;
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}
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static int bd70528_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 bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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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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BD70528_GPIO_DRIVE_MASK,
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BD70528_GPIO_OPEN_DRAIN);
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break;
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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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BD70528_GPIO_DRIVE_MASK,
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BD70528_GPIO_PUSH_PULL);
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break;
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case PIN_CONFIG_INPUT_DEBOUNCE:
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return bd70528_set_debounce(bdgpio, offset,
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pinconf_to_config_argument(config));
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break;
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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 bd70528_direction_input(struct gpio_chip *chip, unsigned int offset)
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{
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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/* Do we need to do something to IRQs here? */
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return regmap_update_bits(bdgpio->regmap, GPIO_OUT_REG(offset),
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BD70528_GPIO_OUT_EN_MASK,
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BD70528_GPIO_OUT_DISABLE);
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}
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static void bd70528_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 bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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u8 val = (value) ? BD70528_GPIO_OUT_HI : BD70528_GPIO_OUT_LO;
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ret = regmap_update_bits(bdgpio->regmap, GPIO_OUT_REG(offset),
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BD70528_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 bd70528_direction_output(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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bd70528_gpio_set(chip, offset, value);
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return regmap_update_bits(bdgpio->regmap, GPIO_OUT_REG(offset),
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BD70528_GPIO_OUT_EN_MASK,
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BD70528_GPIO_OUT_ENABLE);
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}
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#define GPIO_IN_STATE_MASK(offset) (BD70528_GPIO_IN_STATE_BASE << (offset))
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static int bd70528_gpio_get_o(struct bd70528_gpio *bdgpio, unsigned int offset)
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{
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int ret;
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unsigned int val;
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ret = regmap_read(bdgpio->regmap, GPIO_OUT_REG(offset), &val);
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if (!ret)
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ret = !!(val & BD70528_GPIO_OUT_MASK);
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else
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dev_err(bdgpio->dev, "GPIO (out) state read failed\n");
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return ret;
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}
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static int bd70528_gpio_get_i(struct bd70528_gpio *bdgpio, unsigned int offset)
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{
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unsigned int val;
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int ret;
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ret = regmap_read(bdgpio->regmap, BD70528_REG_GPIO_STATE, &val);
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if (!ret)
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ret = !(val & GPIO_IN_STATE_MASK(offset));
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else
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dev_err(bdgpio->dev, "GPIO (in) state read failed\n");
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return ret;
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}
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static int bd70528_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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int ret;
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struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
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/*
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* There is a race condition where someone might be changing the
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* GPIO direction after we get it but before we read the value. But
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* application design where GPIO direction may be changed just when
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* we read GPIO value would be pointless as reader could not know
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* whether the returned high/low state is caused by input or output.
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* Or then there must be other ways to mitigate the issue. Thus
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* locking would make no sense.
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*/
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ret = bd70528_get_direction(chip, offset);
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if (ret == GPIO_LINE_DIRECTION_OUT)
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ret = bd70528_gpio_get_o(bdgpio, offset);
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else if (ret == GPIO_LINE_DIRECTION_IN)
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ret = bd70528_gpio_get_i(bdgpio, offset);
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else
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dev_err(bdgpio->dev, "failed to read GPIO direction\n");
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return ret;
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}
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static int bd70528_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct bd70528_gpio *bdgpio;
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int ret;
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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 = "bd70528-gpio";
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bdgpio->gpio.owner = THIS_MODULE;
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bdgpio->gpio.get_direction = bd70528_get_direction;
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bdgpio->gpio.direction_input = bd70528_direction_input;
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bdgpio->gpio.direction_output = bd70528_direction_output;
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bdgpio->gpio.set_config = bd70528_gpio_set_config;
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bdgpio->gpio.can_sleep = true;
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bdgpio->gpio.get = bd70528_gpio_get;
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bdgpio->gpio.set = bd70528_gpio_set;
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bdgpio->gpio.ngpio = 4;
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bdgpio->gpio.base = -1;
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#ifdef CONFIG_OF_GPIO
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bdgpio->gpio.of_node = dev->parent->of_node;
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#endif
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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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ret = devm_gpiochip_add_data(dev, &bdgpio->gpio, bdgpio);
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if (ret)
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dev_err(dev, "gpio_init: Failed to add bd70528-gpio\n");
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return ret;
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}
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static struct platform_driver bd70528_gpio = {
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.driver = {
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.name = "bd70528-gpio"
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},
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.probe = bd70528_probe,
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};
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module_platform_driver(bd70528_gpio);
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MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
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MODULE_DESCRIPTION("BD70528 voltage regulator driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:bd70528-gpio");
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