From 633a21d80b4a2cd648aa2dacdb22494ffb2f28f0 Mon Sep 17 00:00:00 2001 From: Aaron Lu Date: Tue, 21 Oct 2014 23:30:25 +0200 Subject: [PATCH] input: gpio_keys_polled: Add support for GPIO descriptors 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 Signed-off-by: Mika Westerberg Acked-by: Alexandre Courbot Reviewed-by: Linus Walleij Acked-by: Dmitry Torokhov Acked-by: Grant Likely Signed-off-by: Rafael J. Wysocki --- drivers/input/keyboard/gpio_keys_polled.c | 39 ++++++++++++++++------- include/linux/gpio_keys.h | 3 ++ 2 files changed, 30 insertions(+), 12 deletions(-) diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c index 432d36395f35..b7a514ced509 100644 --- a/drivers/input/keyboard/gpio_keys_polled.c +++ b/drivers/input/keyboard/gpio_keys_polled.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -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); diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h index 8b622468952c..ee2d8c6f9130 100644 --- a/include/linux/gpio_keys.h +++ b/include/linux/gpio_keys.h @@ -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; }; /** -- 2.20.1