ACPI: button: trigger wakeup key events

Andorid can wakeup from various wakeup sources, but only several wakeup
sources can wake up screen with right events(POWER, WAKEUP) from input
device.

Regarding pressing acpi power button, it can resume system and
ACPI_BITMASK_WAKE_STATUS and ACPI_BITMASK_POWER_BUTTON_STATUS are set in
pm1a_sts, but kernel does not report any key event to user space during
resuming by default.

So, send wakeup key event to user space during resume from power button.

Signed-off-by: Ken Xue <Ken.Xue@amd.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 1e76a64cce0a911ceca550086fe2b1256ac98a02..cc61020756beb8711cc9e703becba6972765fbfa 100644 (file)
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -480,6 +480,7 @@ static int acpi_button_suspend(struct device *dev)
 
 static int acpi_button_resume(struct device *dev)
 {
+       struct input_dev *input;
        struct acpi_device *device = to_acpi_device(dev);
        struct acpi_button *button = acpi_driver_data(device);
 
@@ -489,6 +490,14 @@ static int acpi_button_resume(struct device *dev)
                button->last_time = ktime_get();
                acpi_lid_initialize_state(device);
        }
+
+       if (button->type == ACPI_BUTTON_TYPE_POWER) {
+               input = button->input;
+               input_report_key(input, KEY_WAKEUP, 1);
+               input_sync(input);
+               input_report_key(input, KEY_WAKEUP, 0);
+               input_sync(input);
+       }
        return 0;
 }
 #endif
@@ -579,6 +588,7 @@ static int acpi_button_add(struct acpi_device *device)
        switch (button->type) {
        case ACPI_BUTTON_TYPE_POWER:
                input_set_capability(input, EV_KEY, KEY_POWER);
+               input_set_capability(input, EV_KEY, KEY_WAKEUP);
                break;
 
        case ACPI_BUTTON_TYPE_SLEEP: