ACPI / bus: Support for platform initiated graceful shutdown

This patch adds support for platform initited graceful shutdown as
described in sections 5.6.6(Table-143) and 6.3.5.1 of ACPI 6.1 spec

The OSPM will get a graceful shutdown request via a Notify operator
on \_SB device with a value of 0x81 per section 5.6.6. Following the
shutdown request from platform the OSPM needs to follow the
processing sequence as described in section 6.2.5.1.

v3
* Switched to regular work with delays from delayed work
* Dropped changes to actypes.h
* Small style changes

v2
* Switched from standalone driver to a simple notify handler

v1
* Initial

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 9342f4b46a4ef9f8ea180815f294065b10124330..64a3fb0bf1885ec430bd68de6369281b4d2ee7e8 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -30,6 +30,9 @@
 #include <linux/acpi.h>
 #include <linux/slab.h>
 #include <linux/regulator/machine.h>
+#include <linux/workqueue.h>
+#include <linux/reboot.h>
+#include <linux/delay.h>
 #ifdef CONFIG_X86
 #include <asm/mpspec.h>
 #endif
@@ -470,6 +473,56 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device)
                                           acpi_device_notify);
 }
 
+/* Handle events targeting \_SB device (at present only graceful shutdown) */
+
+#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
+#define ACPI_SB_INDICATE_INTERVAL      10000
+
+static void sb_notify_work(struct work_struct *dummy)
+{
+       acpi_handle sb_handle;
+
+       orderly_poweroff(true);
+
+       /*
+        * After initiating graceful shutdown, the ACPI spec requires OSPM
+        * to evaluate _OST method once every 10seconds to indicate that
+        * the shutdown is in progress
+        */
+       acpi_get_handle(NULL, "\\_SB", &sb_handle);
+       while (1) {
+               pr_info("Graceful shutdown in progress.\n");
+               acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
+                               ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
+               msleep(ACPI_SB_INDICATE_INTERVAL);
+       }
+}
+
+static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
+{
+       static DECLARE_WORK(acpi_sb_work, sb_notify_work);
+
+       if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
+               if (!work_busy(&acpi_sb_work))
+                       schedule_work(&acpi_sb_work);
+       } else
+               pr_warn("event %x is not supported by \\_SB device\n", event);
+}
+
+static int __init acpi_setup_sb_notify_handler(void)
+{
+       acpi_handle sb_handle;
+
+       if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
+               return -ENXIO;
+
+       if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
+                                               acpi_sb_notify, NULL)))
+               return -EINVAL;
+
+       return 0;
+}
+
 /* --------------------------------------------------------------------------
                              Device Matching
    -------------------------------------------------------------------------- */
@@ -1118,6 +1171,7 @@ static int __init acpi_init(void)
        acpi_sleep_proc_init();
        acpi_wakeup_device_init();
        acpi_debugger_init();
+       acpi_setup_sb_notify_handler();
        return 0;
 }