mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 06:04:14 +08:00
e42615ec23
It's hard for occasional GPIO code reader/writer to know if values 0/1 equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and GPIO_LINE_DIRECTION_OUT to help them out. NOTE - for gpio-amd-fch and gpio-bd9571mwv: This commit also changes the return value for direction get to equal 1 for direction INPUT. Prior this commit these drivers might have returned some other positive value but 1 for INPUT. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Acked-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Andrew F. Davis <afd@ti.com>
|
|
*
|
|
* Based on the TPS65912 driver
|
|
*/
|
|
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/mfd/tps65086.h>
|
|
|
|
struct tps65086_gpio {
|
|
struct gpio_chip chip;
|
|
struct tps65086 *tps;
|
|
};
|
|
|
|
static int tps65086_gpio_get_direction(struct gpio_chip *chip,
|
|
unsigned offset)
|
|
{
|
|
/* This device is output only */
|
|
return GPIO_LINE_DIRECTION_OUT;
|
|
}
|
|
|
|
static int tps65086_gpio_direction_input(struct gpio_chip *chip,
|
|
unsigned offset)
|
|
{
|
|
/* This device is output only */
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int tps65086_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
struct tps65086_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
/* Set the initial value */
|
|
regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
|
|
BIT(4 + offset), value ? BIT(4 + offset) : 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct tps65086_gpio *gpio = gpiochip_get_data(chip);
|
|
int ret, val;
|
|
|
|
ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return val & BIT(4 + offset);
|
|
}
|
|
|
|
static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
|
|
int value)
|
|
{
|
|
struct tps65086_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
|
|
BIT(4 + offset), value ? BIT(4 + offset) : 0);
|
|
}
|
|
|
|
static const struct gpio_chip template_chip = {
|
|
.label = "tps65086-gpio",
|
|
.owner = THIS_MODULE,
|
|
.get_direction = tps65086_gpio_get_direction,
|
|
.direction_input = tps65086_gpio_direction_input,
|
|
.direction_output = tps65086_gpio_direction_output,
|
|
.get = tps65086_gpio_get,
|
|
.set = tps65086_gpio_set,
|
|
.base = -1,
|
|
.ngpio = 4,
|
|
.can_sleep = true,
|
|
};
|
|
|
|
static int tps65086_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct tps65086_gpio *gpio;
|
|
int ret;
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, gpio);
|
|
|
|
gpio->tps = dev_get_drvdata(pdev->dev.parent);
|
|
gpio->chip = template_chip;
|
|
gpio->chip.parent = gpio->tps->dev;
|
|
|
|
ret = gpiochip_add_data(&gpio->chip, gpio);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tps65086_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
|
|
|
|
gpiochip_remove(&gpio->chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id tps65086_gpio_id_table[] = {
|
|
{ "tps65086-gpio", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
|
|
|
|
static struct platform_driver tps65086_gpio_driver = {
|
|
.driver = {
|
|
.name = "tps65086-gpio",
|
|
},
|
|
.probe = tps65086_gpio_probe,
|
|
.remove = tps65086_gpio_remove,
|
|
.id_table = tps65086_gpio_id_table,
|
|
};
|
|
module_platform_driver(tps65086_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
|
|
MODULE_DESCRIPTION("TPS65086 GPIO driver");
|
|
MODULE_LICENSE("GPL v2");
|