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.
Signed-off-by: Prashanth Prakash <pprakash@xxxxxxxxxxxxxx>
---
drivers/acpi/bus.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
include/acpi/actypes.h | 2 +-
2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 31e8da6..25d4806 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -30,6 +30,8 @@
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/regulator/machine.h>
+#include <linux/workqueue.h>
+#include <linux/reboot.h>
#ifdef CONFIG_X86
#include <asm/mpspec.h>
#endif
@@ -475,6 +477,52 @@ 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_SYBUS_INDICATE_INTERVAL 10000
+
+static void sybus_evaluate_ost(struct work_struct *dummy);
+static DECLARE_DELAYED_WORK(acpi_sybus_work, sybus_evaluate_ost);
+
+static void sybus_evaluate_ost(struct work_struct *dummy)
+{
+ acpi_handle sb_handle;
+
+ if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &sb_handle))) {
+ acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
+ ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
+ schedule_delayed_work(&acpi_sybus_work,
+ msecs_to_jiffies(ACPI_SYBUS_INDICATE_INTERVAL));
+ pr_info("Graceful shutdown in progress.\n");
+ }
+}
+
+static void acpi_sybus_notify(acpi_handle handle, u32 event, void *data)
+{
+ if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
+ if (!delayed_work_pending(&acpi_sybus_work)) {
+ sybus_evaluate_ost(NULL);
+ orderly_poweroff(true);
+ }
+ } else
+ pr_warn("event %x is not supported by \\_SB device\n", event);
+}
+
+static int __init acpi_setup_sybus_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_sybus_notify, NULL)))
+ return -EINVAL;
+
+ return 0;
+}
+
/* --------------------------------------------------------------------------
Device Matching
-------------------------------------------------------------------------- */
@@ -1124,6 +1172,7 @@ static int __init acpi_init(void)
acpi_sleep_proc_init();
acpi_wakeup_device_init();
acpi_debugger_init();
+ acpi_setup_sybus_notify_handler();
return 0;
}
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index cb389ef..860b273 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -627,7 +627,7 @@ typedef u64 acpi_integer;
#define ACPI_NOTIFY_DEVICE_PLD_CHECK (u8) 0x09
#define ACPI_NOTIFY_RESERVED (u8) 0x0A
#define ACPI_NOTIFY_LOCALITY_UPDATE (u8) 0x0B
-#define ACPI_NOTIFY_SHUTDOWN_REQUEST (u8) 0x0C
+#define ACPI_NOTIFY_RESERVED_2 (u8) 0x0C
#define ACPI_NOTIFY_AFFINITY_UPDATE (u8) 0x0D
#define ACPI_GENERIC_NOTIFY_MAX 0x0D
--
Qualcomm Technologies, Inc. on behalf
of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc.
is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
