ACPI: Add new tiny-power-button driver to directly signal init

[sfrench/cifs-2.6.git] / drivers / acpi / Kconfig

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index cc57bab146b5c23dbbb264874879a3d19df54a57..ce2730d61a8fc8e81cb579c2a0e37fd80c7c0690 100644 (file)
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -190,6 +190,30 @@ config ACPI_BUTTON
          To compile this driver as a module, choose M here:
          the module will be called button.
 
+config ACPI_TINY_POWER_BUTTON
+       tristate "Tiny Power Button Driver"
+       depends on !ACPI_BUTTON
+       help
+         This driver provides a tiny alternative to the ACPI Button driver.
+         The tiny power button driver only handles the power button. Rather
+         than notifying userspace via the input layer or a netlink event, this
+         driver directly signals the init process to shut down.
+
+         This driver is particularly suitable for cloud and VM environments,
+         which use a simulated power button to initiate a controlled poweroff,
+         but which may not want to run a separate userspace daemon to process
+         input events.
+
+config ACPI_TINY_POWER_BUTTON_SIGNAL
+       int "Tiny Power Button Signal"
+       depends on ACPI_TINY_POWER_BUTTON
+       default 38
+       help
+         Default signal to send to init in response to the power button.
+
+         Likely values here include 38 (SIGRTMIN+4) to power off, or 2
+         (SIGINT) to simulate Ctrl+Alt+Del.
+
 config ACPI_VIDEO
        tristate "Video"
        depends on X86 && BACKLIGHT_CLASS_DEVICE