linux/drivers/gpio/gpio-tps65086.c
Matti Vaittinen e42615ec23 gpio: Use new GPIO_LINE_DIRECTION
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>
2019-11-07 09:27:48 +01:00

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");