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authorGeert Uytterhoeven <geert+renesas@glider.be>2017-04-04 19:32:22 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-04-12 12:41:19 +0200
commitdb7c1706fa6d9d1c2f2ab651814130b60bca26d1 (patch)
tree4cc3214eaa4b2d115681573ff9227c17649079d0 /drivers
parent80b0d7e623d10d4bc9bad2a35d6ce18e08454b3d (diff)
Input: gpio_keys - add support for GPIO descriptors
[ Upstream commit 5feeca3c1e39c01f9ef5abc94dea94021ccf94fc ] 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. Based on commits 633a21d80b4a2cd6 ("input: gpio_keys_polled: Add support for GPIO descriptors") and 1ae5ddb6f8837558 ("Input: gpio_keys_polled - request GPIO pin as input."). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/keyboard/gpio_keys.c37
1 files changed, 26 insertions, 11 deletions
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 29093657f2ef..9b8079ca0fb4 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -26,6 +26,7 @@
#include <linux/gpio_keys.h>
#include <linux/workqueue.h>
#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
@@ -35,6 +36,7 @@
struct gpio_button_data {
const struct gpio_keys_button *button;
struct input_dev *input;
+ struct gpio_desc *gpiod;
struct timer_list release_timer;
unsigned int release_delay; /* in msecs, for IRQ-only buttons */
@@ -140,7 +142,7 @@ static void gpio_keys_disable_button(struct gpio_button_data *bdata)
*/
disable_irq(bdata->irq);
- if (gpio_is_valid(bdata->button->gpio))
+ if (bdata->gpiod)
cancel_delayed_work_sync(&bdata->work);
else
del_timer_sync(&bdata->release_timer);
@@ -358,19 +360,20 @@ static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
const struct gpio_keys_button *button = bdata->button;
struct input_dev *input = bdata->input;
unsigned int type = button->type ?: EV_KEY;
- int state = gpio_get_value_cansleep(button->gpio);
+ int state;
+ state = gpiod_get_value_cansleep(bdata->gpiod);
if (state < 0) {
- dev_err(input->dev.parent, "failed to get gpio state\n");
+ dev_err(input->dev.parent,
+ "failed to get gpio state: %d\n", state);
return;
}
- state = (state ? 1 : 0) ^ button->active_low;
if (type == EV_ABS) {
if (state)
input_event(input, type, button->code, button->value);
} else {
- input_event(input, type, button->code, !!state);
+ input_event(input, type, button->code, state);
}
input_sync(input);
}
@@ -456,7 +459,7 @@ static void gpio_keys_quiesce_key(void *data)
{
struct gpio_button_data *bdata = data;
- if (gpio_is_valid(bdata->button->gpio))
+ if (bdata->gpiod)
cancel_delayed_work_sync(&bdata->work);
else
del_timer_sync(&bdata->release_timer);
@@ -478,18 +481,30 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
bdata->button = button;
spin_lock_init(&bdata->lock);
+ /*
+ * Legacy GPIO number, so request the GPIO here and
+ * convert it to descriptor.
+ */
if (gpio_is_valid(button->gpio)) {
+ unsigned flags = GPIOF_IN;
+
+ if (button->active_low)
+ flags |= GPIOF_ACTIVE_LOW;
- error = devm_gpio_request_one(&pdev->dev, button->gpio,
- GPIOF_IN, desc);
+ error = devm_gpio_request_one(&pdev->dev, button->gpio, flags,
+ desc);
if (error < 0) {
dev_err(dev, "Failed to request GPIO %d, error %d\n",
button->gpio, error);
return error;
}
+ bdata->gpiod = gpio_to_desc(button->gpio);
+ if (!bdata->gpiod)
+ return -EINVAL;
+
if (button->debounce_interval) {
- error = gpio_set_debounce(button->gpio,
+ error = gpiod_set_debounce(bdata->gpiod,
button->debounce_interval * 1000);
/* use timer if gpiolib doesn't provide debounce */
if (error < 0)
@@ -500,7 +515,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
if (button->irq) {
bdata->irq = button->irq;
} else {
- irq = gpio_to_irq(button->gpio);
+ irq = gpiod_to_irq(bdata->gpiod);
if (irq < 0) {
error = irq;
dev_err(dev,
@@ -575,7 +590,7 @@ static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata)
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
- if (gpio_is_valid(bdata->button->gpio))
+ if (bdata->gpiod)
gpio_keys_gpio_report_event(bdata);
}
input_sync(input);