mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
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>
196 lines
4.7 KiB
C
196 lines
4.7 KiB
C
/*
|
|
* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Keerthy <j-keerthy@ti.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 LP873X driver
|
|
*/
|
|
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include <linux/mfd/lp87565.h>
|
|
|
|
struct lp87565_gpio {
|
|
struct gpio_chip chip;
|
|
struct regmap *map;
|
|
};
|
|
|
|
static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
|
|
int ret, val;
|
|
|
|
ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return !!(val & BIT(offset));
|
|
}
|
|
|
|
static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
|
|
int value)
|
|
{
|
|
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
|
|
BIT(offset), value ? BIT(offset) : 0);
|
|
}
|
|
|
|
static int lp87565_gpio_get_direction(struct gpio_chip *chip,
|
|
unsigned int offset)
|
|
{
|
|
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
|
|
int ret, val;
|
|
|
|
ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (val & BIT(offset))
|
|
return GPIO_LINE_DIRECTION_OUT;
|
|
|
|
return GPIO_LINE_DIRECTION_IN;
|
|
}
|
|
|
|
static int lp87565_gpio_direction_input(struct gpio_chip *chip,
|
|
unsigned int offset)
|
|
{
|
|
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
return regmap_update_bits(gpio->map,
|
|
LP87565_REG_GPIO_CONFIG,
|
|
BIT(offset), 0);
|
|
}
|
|
|
|
static int lp87565_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned int offset, int value)
|
|
{
|
|
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
lp87565_gpio_set(chip, offset, value);
|
|
|
|
return regmap_update_bits(gpio->map,
|
|
LP87565_REG_GPIO_CONFIG,
|
|
BIT(offset), BIT(offset));
|
|
}
|
|
|
|
static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
|
|
{
|
|
struct lp87565_gpio *gpio = gpiochip_get_data(gc);
|
|
int ret;
|
|
|
|
switch (offset) {
|
|
case 0:
|
|
case 1:
|
|
case 2:
|
|
/*
|
|
* MUX can program the pin to be in EN1/2/3 pin mode
|
|
* Or GPIO1/2/3 mode.
|
|
* Setup the GPIO*_SEL MUX to GPIO mode
|
|
*/
|
|
ret = regmap_update_bits(gpio->map,
|
|
LP87565_REG_PIN_FUNCTION,
|
|
BIT(offset), BIT(offset));
|
|
if (ret)
|
|
return ret;
|
|
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
|
|
unsigned long config)
|
|
{
|
|
struct lp87565_gpio *gpio = gpiochip_get_data(gc);
|
|
|
|
switch (pinconf_to_config_param(config)) {
|
|
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
|
|
return regmap_update_bits(gpio->map,
|
|
LP87565_REG_GPIO_CONFIG,
|
|
BIT(offset +
|
|
__ffs(LP87565_GOIO1_OD)),
|
|
BIT(offset +
|
|
__ffs(LP87565_GOIO1_OD)));
|
|
case PIN_CONFIG_DRIVE_PUSH_PULL:
|
|
return regmap_update_bits(gpio->map,
|
|
LP87565_REG_GPIO_CONFIG,
|
|
BIT(offset +
|
|
__ffs(LP87565_GOIO1_OD)), 0);
|
|
default:
|
|
return -ENOTSUPP;
|
|
}
|
|
}
|
|
|
|
static const struct gpio_chip template_chip = {
|
|
.label = "lp87565-gpio",
|
|
.owner = THIS_MODULE,
|
|
.request = lp87565_gpio_request,
|
|
.get_direction = lp87565_gpio_get_direction,
|
|
.direction_input = lp87565_gpio_direction_input,
|
|
.direction_output = lp87565_gpio_direction_output,
|
|
.get = lp87565_gpio_get,
|
|
.set = lp87565_gpio_set,
|
|
.set_config = lp87565_gpio_set_config,
|
|
.base = -1,
|
|
.ngpio = 3,
|
|
.can_sleep = true,
|
|
};
|
|
|
|
static int lp87565_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct lp87565_gpio *gpio;
|
|
struct lp87565 *lp87565;
|
|
int ret;
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
lp87565 = dev_get_drvdata(pdev->dev.parent);
|
|
gpio->chip = template_chip;
|
|
gpio->chip.parent = lp87565->dev;
|
|
gpio->map = lp87565->regmap;
|
|
|
|
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 lp87565_gpio_id_table[] = {
|
|
{ "lp87565-q1-gpio", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
|
|
|
|
static struct platform_driver lp87565_gpio_driver = {
|
|
.driver = {
|
|
.name = "lp87565-gpio",
|
|
},
|
|
.probe = lp87565_gpio_probe,
|
|
.id_table = lp87565_gpio_id_table,
|
|
};
|
|
module_platform_driver(lp87565_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
|
|
MODULE_DESCRIPTION("LP87565 GPIO driver");
|
|
MODULE_LICENSE("GPL v2");
|