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authorGeert Uytterhoeven <geert+renesas@glider.be>2016-10-19 15:47:21 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2016-11-07 16:24:31 -0800
commit5feeca3c1e39c01f9ef5abc94dea94021ccf94fc (patch)
tree2939778e784d5955ce0e04a317caffbfd39747d9 /drivers/input
parent0860913b02c28f0a1d8b515b99ae6419ef10569f (diff)
downloadlinux-next-5feeca3c1e39c01f9ef5abc94dea94021ccf94fc.tar.gz
Input: gpio_keys - 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. 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>
Diffstat (limited to 'drivers/input')
-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 d75a25c187ae..0f04cb1569a0 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);