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input: gpio_keys_polled: Add support for GPIO descriptors

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GPIO descriptors are the preferred way over legacy GPIO numbers
nowadays. Convert the driver to use GPIO descriptors internally but
still allow passing legacy GPIO numbers from platform data to support
existing platforms.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Aaron Lu 2014-10-21 23:30:25 +02:00 committed by Rafael J. Wysocki
parent 5c51277a9a
commit 633a21d80b
2 changed files with 30 additions and 12 deletions
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39
drivers/input/keyboard/gpio_keys_polled.c
View File

@ -23,6 +23,7 @@
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio_keys.h>
#include <linux/of.h>
#include <linux/of_platform.h>
@ -51,15 +52,14 @@ static void gpio_keys_polled_check_state(struct input_dev *input,
int state;
if (bdata->can_sleep)
state = !!gpio_get_value_cansleep(button->gpio);
state = !!gpiod_get_value_cansleep(button->gpiod);
else
state = !!gpio_get_value(button->gpio);
state = !!gpiod_get_value(button->gpiod);
if (state != bdata->last_state) {
unsigned int type = button->type ?: EV_KEY;
input_event(input, type, button->code,
!!(state ^ button->active_low));
input_event(input, type, button->code, state);
input_sync(input);
bdata->count = 0;
bdata->last_state = state;
@ -259,7 +259,6 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &pdata->buttons[i];
struct gpio_keys_button_data *bdata = &bdev->data[i];
unsigned int gpio = button->gpio;
unsigned int type = button->type ?: EV_KEY;
if (button->wakeup) {
@ -267,15 +266,31 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
return -EINVAL;
}
error = devm_gpio_request_one(&pdev->dev, gpio, GPIOF_IN,
button->desc ? : DRV_NAME);
if (error) {
dev_err(dev, "unable to claim gpio %u, err=%d\n",
gpio, error);
return error;
/*
* Legacy GPIO number so request the GPIO here and
* convert it to descriptor.
*/
if (!button->gpiod && gpio_is_valid(button->gpio)) {
unsigned flags = 0;
if (button->active_low)
flags |= GPIOF_ACTIVE_LOW;
error = devm_gpio_request_one(&pdev->dev, button->gpio,
flags, button->desc ? : DRV_NAME);
if (error) {
dev_err(dev, "unable to claim gpio %u, err=%d\n",
button->gpio, error);
return error;
}
button->gpiod = gpio_to_desc(button->gpio);
}
bdata->can_sleep = gpio_cansleep(gpio);
if (IS_ERR(button->gpiod))
return PTR_ERR(button->gpiod);
bdata->can_sleep = gpiod_cansleep(button->gpiod);
bdata->last_state = -1;
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
pdata->poll_interval);

3
include/linux/gpio_keys.h
View File

@ -2,6 +2,7 @@
#define _GPIO_KEYS_H
struct device;
struct gpio_desc;
/**
* struct gpio_keys_button - configuration parameters
@ -17,6 +18,7 @@ struct device;
* disable button via sysfs
* @value: axis value for %EV_ABS
* @irq: Irq number in case of interrupt keys
* @gpiod: GPIO descriptor
*/
struct gpio_keys_button {
unsigned int code;
@ -29,6 +31,7 @@ struct gpio_keys_button {
bool can_disable;
int value;
unsigned int irq;
struct gpio_desc *gpiod;
};
/**