x86/olpc/xo1/sci: Produce wakeup events for buttons and switches

Produce wakeup events for the XO-1's power button, lid switch
and ebook switch, taking care to only produce events when the
states have changed.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Cc: dilinger@queued.net
Cc: pgf@laptop.org
Link: http://lkml.kernel.org/r/20120412171824.D14C49D401E@zog.reactivated.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/platform/olpc/olpc-xo1-sci.c b/arch/x86/platform/olpc/olpc-xo1-sci.c
index 1d4c783..4b93ff4 100644 (file)
--- a/arch/x86/platform/olpc/olpc-xo1-sci.c
+++ b/arch/x86/platform/olpc/olpc-xo1-sci.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
+#include <linux/pm_wakeup.h>
 #include <linux/mfd/core.h>
 #include <linux/power_supply.h>
 #include <linux/suspend.h>
@@ -83,8 +84,12 @@ static void send_ebook_state(void)
                return;
        }
 
+       if (!!test_bit(SW_TABLET_MODE, ebook_switch_idev->sw) == state)
+               return; /* Nothing new to report. */
+
        input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state);
        input_sync(ebook_switch_idev);
+       pm_wakeup_event(&ebook_switch_idev->dev, 0);
 }
 
 static void flip_lid_inverter(void)
@@ -123,8 +128,12 @@ static void detect_lid_state(void)
 /* Report current lid switch state through input layer */
 static void send_lid_state(void)
 {
+       if (!!test_bit(SW_LID, lid_switch_idev->sw) == !lid_open)
+               return; /* Nothing new to report. */
+
        input_report_switch(lid_switch_idev, SW_LID, !lid_open);
        input_sync(lid_switch_idev);
+       pm_wakeup_event(&lid_switch_idev->dev, 0);
 }
 
 static ssize_t lid_wake_mode_show(struct device *dev,
@@ -213,11 +222,18 @@ static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
 
        dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
 
-       if (sts & CS5536_PWRBTN_FLAG && !(sts & CS5536_WAK_FLAG)) {
-               input_report_key(power_button_idev, KEY_POWER, 1);
-               input_sync(power_button_idev);
-               input_report_key(power_button_idev, KEY_POWER, 0);
-               input_sync(power_button_idev);
+       if (sts & CS5536_PWRBTN_FLAG) {
+               if (!(sts & CS5536_WAK_FLAG)) {
+                       /* Only report power button input when it was pressed
+                        * during regular operation (as opposed to when it
+                        * was used to wake the system). */
+                       input_report_key(power_button_idev, KEY_POWER, 1);
+                       input_sync(power_button_idev);
+                       input_report_key(power_button_idev, KEY_POWER, 0);
+                       input_sync(power_button_idev);
+               }
+               /* Report the wakeup event in all cases. */
+               pm_wakeup_event(&power_button_idev->dev, 0);
        }
 
        if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */