[PATCH 2/6] Input: gpio_keys_polled - always use gpiod_get_value_cansleep

[Dmitry Torokhov]

It does not matter if given GPIO may sleep or not when reading state,
polling is always done in a non-atomic context, so we should always
be able to simply use gpiod_get_value_cansleep().

Also let's note in the logs when we fail to read gpio state.

Reviewed-by: Hans de Goede <hdego...@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Acked-by: Linus Walleij <linus.wall...@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
---
 drivers/input/keyboard/gpio_keys_polled.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/input/keyboard/gpio_keys_polled.c 
b/drivers/input/keyboard/gpio_keys_polled.c
index 2cf4078..72b3503 100644
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c
@@ -34,7 +34,6 @@ struct gpio_keys_button_data {
        int last_state;
        int count;
        int threshold;
-       int can_sleep;
 };
 
 struct gpio_keys_polled_dev {
@@ -76,16 +75,17 @@ static void gpio_keys_polled_check_state(struct 
input_polled_dev *dev,
 {
        int state;
 
-       if (bdata->can_sleep)
-               state = !!gpiod_get_value_cansleep(bdata->gpiod);
-       else
-               state = !!gpiod_get_value(bdata->gpiod);
-
-       gpio_keys_button_event(dev, button, state);
+       state = gpiod_get_value_cansleep(bdata->gpiod);
+       if (state < 0) {
+               dev_err(dev->input->dev.parent,
+                       "failed to get gpio state: %d\n", state);
+       } else {
+               gpio_keys_button_event(dev, button, state);
 
-       if (state != bdata->last_state) {
-               bdata->count = 0;
-               bdata->last_state = state;
+               if (state != bdata->last_state) {
+                       bdata->count = 0;
+                       bdata->last_state = state;
+               }
        }
 }
 
@@ -342,7 +342,6 @@ static int gpio_keys_polled_probe(struct platform_device 
*pdev)
                        }
                }
 
-               bdata->can_sleep = gpiod_cansleep(bdata->gpiod);
                bdata->last_state = -1;
                bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
                                                pdata->poll_interval);
-- 
2.8.0.rc3.226.g39d4020