[1/3] ACPI: Add infrastructure for refcounting GPE consumers

Commit Message

Matthew Garrett Nov. 9, 2009, 10:29 p.m. UTC

None

Patch

diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index 81e64f4..13cb80c 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -426,6 +426,8 @@  struct acpi_gpe_event_info {
 	struct acpi_gpe_register_info *register_info;	/* Backpointer to register info */
 	u8 flags;		/* Misc info about this GPE */
 	u8 gpe_number;		/* This GPE */
+	u8 runtime_count;
+	u8 wakeup_count;
 };
 
 /* Information about a GPE register pair, one per each status/enable pair in an array */
diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
index 4721f58..614f006 100644
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -201,6 +201,167 @@  ACPI_EXPORT_SYMBOL(acpi_enable_event)
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ref_runtime_gpe
+ *
+ * PARAMETERS:  gpe_device      - Parent GPE Device
+ *              gpe_number      - GPE level within the GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Take a reference to a runtime GPE
+ *
+ ******************************************************************************/
+acpi_status acpi_ref_runtime_gpe(acpi_handle gpe_device, u32 gpe_number)
+{
+	acpi_status status = AE_OK;
+	acpi_cpu_flags flags;
+	struct acpi_gpe_event_info *gpe_event_info;
+
+	ACPI_FUNCTION_TRACE(acpi_ref_runtime_gpe);
+
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+	/* Ensure that we have a valid GPE number */
+
+	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
+	if (!gpe_event_info) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	if (++gpe_event_info->runtime_count == 1)
+		status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
+
+	if (ACPI_FAILURE(status))
+		gpe_event_info->runtime_count--;
+
+unlock_and_exit:
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+	return_ACPI_STATUS(status);
+}
+ACPI_EXPORT_SYMBOL(acpi_ref_runtime_gpe)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_unref_runtime_gpe
+ *
+ * PARAMETERS:  gpe_device      - Parent GPE Device
+ *              gpe_number      - GPE level within the GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Release a reference to a runtime GPE
+ *
+ ******************************************************************************/
+acpi_status acpi_unref_runtime_gpe(acpi_handle gpe_device, u32 gpe_number)
+{
+	acpi_status status = AE_OK;
+	acpi_cpu_flags flags;
+	struct acpi_gpe_event_info *gpe_event_info;
+
+	ACPI_FUNCTION_TRACE(acpi_unref_runtime_gpe);
+
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+	/* Ensure that we have a valid GPE number */
+
+	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
+	if (!gpe_event_info) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	if (--gpe_event_info->runtime_count == 0)
+		acpi_ev_disable_gpe(gpe_event_info);
+
+unlock_and_exit:
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+	return_ACPI_STATUS(status);
+}
+ACPI_EXPORT_SYMBOL(acpi_unref_runtime_gpe)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ref_wakeup_gpe
+ *
+ * PARAMETERS:  gpe_device      - Parent GPE Device
+ *              gpe_number      - GPE level within the GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Take a reference to a wakeup GPE
+ *
+ ******************************************************************************/
+acpi_status acpi_ref_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number)
+{
+	acpi_status status = AE_OK;
+	acpi_cpu_flags flags;
+	struct acpi_gpe_event_info *gpe_event_info;
+
+	ACPI_FUNCTION_TRACE(acpi_ref_wakeup_gpe);
+
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+	/* Ensure that we have a valid GPE number */
+
+	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
+	if (!gpe_event_info) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	if (++gpe_event_info->wakeup_count == 1)
+		acpi_ev_update_gpe_enable_masks(gpe_event_info,
+						ACPI_GPE_ENABLE);
+
+unlock_and_exit:
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+	return_ACPI_STATUS(status);
+}
+ACPI_EXPORT_SYMBOL(acpi_ref_wakeup_gpe)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_unref_wakeup_gpe
+ *
+ * PARAMETERS:  gpe_device      - Parent GPE Device
+ *              gpe_number      - GPE level within the GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Release a reference to a wakeup GPE
+ *
+ ******************************************************************************/
+acpi_status acpi_unref_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number)
+{
+	acpi_status status = AE_OK;
+	acpi_cpu_flags flags;
+	struct acpi_gpe_event_info *gpe_event_info;
+
+	ACPI_FUNCTION_TRACE(acpi_unref_wakeup_gpe);
+
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+	/* Ensure that we have a valid GPE number */
+
+	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
+	if (!gpe_event_info) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	if (--gpe_event_info->wakeup_count == 0)
+		acpi_ev_update_gpe_enable_masks(gpe_event_info,
+			ACPI_GPE_DISABLE);
+
+unlock_and_exit:
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+	return_ACPI_STATUS(status);
+}
+ACPI_EXPORT_SYMBOL(acpi_unref_wakeup_gpe)
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_set_gpe_type
  *
  * PARAMETERS:  gpe_device      - Parent GPE Device
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index e723b0f..bb3c975 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -282,6 +282,14 @@  acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status);
  */
 acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type);
 
+acpi_status acpi_ref_runtime_gpe(acpi_handle gpe_device, u32 gpe_number);
+
+acpi_status acpi_unref_runtime_gpe(acpi_handle gpe_device, u32 gpe_number);
+
+acpi_status acpi_ref_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number);
+
+acpi_status acpi_unref_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number);
+
 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number);
 
 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number);