Input: i8042 - allow KBD and AUX ports to wake up from suspend-to-idle

While registering serio device for i8042, mark them as wakeup-capable
and check their user space wakeup settings in i8042_pm_suspend() and
i8042_pm_resume() to enable or disable, respectively, their interrupts
to wake up the system.

This makes it possible to use the PC keyboard to wake up the system
from suspend-to-idle, among other things, after writing "enabled" to
the keyboard serio device's power/wakeup sysfs attribute.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 25 insertions, 3 deletions

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 986a71c614b0..cb5ece77fd7d 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -1162,13 +1162,32 @@ static int i8042_controller_resume(bool force_reset)
 
 static int i8042_pm_suspend(struct device *dev)
 {
+        int i;
+
         i8042_controller_reset(true);
 
+        /* Set up serio interrupts for system wakeup. */
+        for (i = 0; i < I8042_NUM_PORTS; i++) {
+                struct serio *serio = i8042_ports[i].serio;
+
+                if (serio && device_may_wakeup(&serio->dev))
+                        enable_irq_wake(i8042_ports[i].irq);
+        }
+
         return 0;
 }
 
 static int i8042_pm_resume(struct device *dev)
 {
+        int i;
+
+        for (i = 0; i < I8042_NUM_PORTS; i++) {
+                struct serio *serio = i8042_ports[i].serio;
+
+                if (serio && device_may_wakeup(&serio->dev))
+                        disable_irq_wake(i8042_ports[i].irq);
+        }
+
         /*
          * On resume from S2R we always try to reset the controller
          * to bring it in a sane state. (In case of S2D we expect
@@ -1300,13 +1319,16 @@ static void __init i8042_register_ports(void)
         int i;
 
         for (i = 0; i < I8042_NUM_PORTS; i++) {
-                if (i8042_ports[i].serio) {
+                struct serio *serio = i8042_ports[i].serio;
+
+                if (serio) {
                         printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
-                                i8042_ports[i].serio->name,
+                                serio->name,
                                 (unsigned long) I8042_DATA_REG,
                                 (unsigned long) I8042_COMMAND_REG,
                                 i8042_ports[i].irq);
-                        serio_register_port(i8042_ports[i].serio);
+                        serio_register_port(serio);
+                        device_set_wakeup_capable(&serio->dev, true);
                 }
         }
 }