mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 12:14:01 +08:00
9384793036
Add driver for the GPIO block in the ROHM BD9571MWV-W MFD PMIC. This block is pretty trivial and supports setting GPIO direction as Input/Output and in case of Output, supports setting value. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: linux-gpio@vger.kernel.org Cc: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
|
|
* ROHM BD9571MWV-M GPIO driver
|
|
*
|
|
* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether expressed or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License version 2 for more details.
|
|
*
|
|
* Based on the TPS65086 driver
|
|
*
|
|
* NOTE: Interrupts are not supported yet.
|
|
*/
|
|
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/mfd/bd9571mwv.h>
|
|
|
|
struct bd9571mwv_gpio {
|
|
struct gpio_chip chip;
|
|
struct bd9571mwv *bd;
|
|
};
|
|
|
|
static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
|
|
unsigned int offset)
|
|
{
|
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
|
|
int ret, val;
|
|
|
|
ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return val & BIT(offset);
|
|
}
|
|
|
|
static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
|
|
unsigned int offset)
|
|
{
|
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
|
|
BIT(offset), 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned int offset, int value)
|
|
{
|
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
/* Set the initial value */
|
|
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
|
|
BIT(offset), value ? BIT(offset) : 0);
|
|
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
|
|
BIT(offset), BIT(offset));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
|
|
int ret, val;
|
|
|
|
ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return val & BIT(offset);
|
|
}
|
|
|
|
static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
|
|
int value)
|
|
{
|
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
|
|
BIT(offset), value ? BIT(offset) : 0);
|
|
}
|
|
|
|
static const struct gpio_chip template_chip = {
|
|
.label = "bd9571mwv-gpio",
|
|
.owner = THIS_MODULE,
|
|
.get_direction = bd9571mwv_gpio_get_direction,
|
|
.direction_input = bd9571mwv_gpio_direction_input,
|
|
.direction_output = bd9571mwv_gpio_direction_output,
|
|
.get = bd9571mwv_gpio_get,
|
|
.set = bd9571mwv_gpio_set,
|
|
.base = -1,
|
|
.ngpio = 2,
|
|
.can_sleep = true,
|
|
};
|
|
|
|
static int bd9571mwv_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct bd9571mwv_gpio *gpio;
|
|
int ret;
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, gpio);
|
|
|
|
gpio->bd = dev_get_drvdata(pdev->dev.parent);
|
|
gpio->chip = template_chip;
|
|
gpio->chip.parent = gpio->bd->dev;
|
|
|
|
ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
|
|
{ "bd9571mwv-gpio", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
|
|
|
|
static struct platform_driver bd9571mwv_gpio_driver = {
|
|
.driver = {
|
|
.name = "bd9571mwv-gpio",
|
|
},
|
|
.probe = bd9571mwv_gpio_probe,
|
|
.id_table = bd9571mwv_gpio_id_table,
|
|
};
|
|
module_platform_driver(bd9571mwv_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
|
|
MODULE_DESCRIPTION("BD9571MWV GPIO driver");
|
|
MODULE_LICENSE("GPL v2");
|