Shutdown after resume using power button

[Marcelo Tosatti]

Hi folks,

I was reading olpc-pm.c while I stumbled across this code


static int olpc_pm_interrupt(int irq, void *id)
{
        uint32_t sts, gpe = 0;

        sts = inl(acpi_base + PM1_STS);
        outl(sts | 0xFFFF, acpi_base + PM1_STS);

        if (olpc_get_rev() >= OLPC_REV_B2) {
                gpe = inl(acpi_base + PM_GPE0_STS);
                outl(0xFFFFFFFF, acpi_base + PM_GPE0_STS);
        }

        if (sts & CS5536_PM_PWRBTN) {
                input_report_key(pm_inputdev, KEY_POWER, 1);
                input_sync(pm_inputdev);
                /* Do we need to delay this (and hence schedule_work)? */
                input_report_key(pm_inputdev, KEY_POWER, 0);
                input_sync(pm_inputdev);
        }

So we report the KEY_POWER event down to userspace, which is probably
the reason why we're seeing the powerdown sequence being started.

Now I wonder why exactly is this piece of code here? Shouldnt we export
the "reason for wakeup" information via another means?