Input: matrix-keypad - handle cases when GPIOs can't be wakeup sources
On certain boards not all GPIOs may be used as wakeup sources, in which
case some of enable_irq_wake() calls will fail. On resume calling
disable_irq_wake() will warn about unbalanced IRQ wake disable.
Solve this by checking whether enable_irq_wake() succeeded or not and
no not call disable_irq_wake() for these GPIOs/IRQs that have not been
enabled.
Reported-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
index 34f4a29..d3c8b61 100644
--- a/drivers/input/keyboard/matrix_keypad.c
+++ b/drivers/input/keyboard/matrix_keypad.c
@@ -29,11 +29,13 @@
unsigned short *keycodes;
unsigned int row_shift;
+ DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);
+
uint32_t last_key_state[MATRIX_MAX_COLS];
struct delayed_work work;
+ spinlock_t lock;
bool scan_pending;
bool stopped;
- spinlock_t lock;
};
/*
@@ -222,9 +224,16 @@
matrix_keypad_stop(keypad->input_dev);
- if (device_may_wakeup(&pdev->dev))
- for (i = 0; i < pdata->num_row_gpios; i++)
- enable_irq_wake(gpio_to_irq(pdata->row_gpios[i]));
+ if (device_may_wakeup(&pdev->dev)) {
+ for (i = 0; i < pdata->num_row_gpios; i++) {
+ if (!test_bit(i, keypad->disabled_gpios)) {
+ unsigned int gpio = pdata->row_gpios[i];
+
+ if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
+ __set_bit(i, keypad->disabled_gpios);
+ }
+ }
+ }
return 0;
}
@@ -236,9 +245,15 @@
const struct matrix_keypad_platform_data *pdata = keypad->pdata;
int i;
- if (device_may_wakeup(&pdev->dev))
- for (i = 0; i < pdata->num_row_gpios; i++)
- disable_irq_wake(gpio_to_irq(pdata->row_gpios[i]));
+ if (device_may_wakeup(&pdev->dev)) {
+ for (i = 0; i < pdata->num_row_gpios; i++) {
+ if (test_and_clear_bit(i, keypad->disabled_gpios)) {
+ unsigned int gpio = pdata->row_gpios[i];
+
+ disable_irq_wake(gpio_to_irq(gpio));
+ }
+ }
+ }
matrix_keypad_start(keypad->input_dev);