mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
cb38cd7035
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
|
|
// 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");
|