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path: root/drivers/gpio/gpio-bd70528.c
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Diffstat (limited to 'drivers/gpio/gpio-bd70528.c')
-rw-r--r--drivers/gpio/gpio-bd70528.c230
1 files changed, 0 insertions, 230 deletions
diff --git a/drivers/gpio/gpio-bd70528.c b/drivers/gpio/gpio-bd70528.c
deleted file mode 100644
index 397a50d6bc65..000000000000
--- a/drivers/gpio/gpio-bd70528.c
+++ /dev/null
@@ -1,230 +0,0 @@
-// 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 regmap *regmap;
- struct device *dev;
- 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->dev,
- "Invalid debounce value %u\n", debounce);
- return -EINVAL;
- }
- return regmap_update_bits(bdgpio->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->regmap, GPIO_OUT_REG(offset), &val);
- if (ret) {
- dev_err(bdgpio->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->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->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->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->regmap, GPIO_OUT_REG(offset),
- BD70528_GPIO_OUT_MASK, val);
- if (ret)
- dev_err(bdgpio->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->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->regmap, GPIO_OUT_REG(offset), &val);
- if (!ret)
- ret = !!(val & BD70528_GPIO_OUT_MASK);
- else
- dev_err(bdgpio->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->regmap, BD70528_REG_GPIO_STATE, &val);
-
- if (!ret)
- ret = !(val & GPIO_IN_STATE_MASK(offset));
- else
- dev_err(bdgpio->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->dev, "failed to read GPIO direction\n");
-
- return ret;
-}
-
-static int bd70528_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct bd70528_gpio *bdgpio;
- int ret;
-
- bdgpio = devm_kzalloc(dev, sizeof(*bdgpio), GFP_KERNEL);
- if (!bdgpio)
- return -ENOMEM;
- bdgpio->dev = dev;
- bdgpio->gpio.parent = 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 = dev->parent->of_node;
-#endif
- bdgpio->regmap = dev_get_regmap(dev->parent, NULL);
- if (!bdgpio->regmap)
- return -ENODEV;
-
- ret = devm_gpiochip_add_data(dev, &bdgpio->gpio, bdgpio);
- if (ret)
- dev_err(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");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.