patch-2.4.22 linux-2.4.22/drivers/acpi/events/evgpe.c

• Lines: 426
• Date: 2003-08-25 04:44:41.000000000 -0700
• Orig file: linux-2.4.21/drivers/acpi/events/evgpe.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/drivers/acpi/events/evgpe.c linux-2.4.22/drivers/acpi/events/evgpe.c
@@ -0,0 +1,425 @@
+/******************************************************************************
+ *
+ * Module Name: evgpe - General Purpose Event handling and dispatch
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2003, R. Byron Moore
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include <acpi/acevents.h>
+#include <acpi/acnamesp.h>
+
+#define _COMPONENT          ACPI_EVENTS
+	 ACPI_MODULE_NAME    ("evgpe")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_get_gpe_event_info
+ *
+ * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
+ *              gpe_number          - Raw GPE number
+ *
+ * RETURN:      A GPE event_info struct. NULL if not a valid GPE
+ *
+ * DESCRIPTION: Returns the event_info struct associated with this GPE.
+ *              Validates the gpe_block and the gpe_number
+ *
+ *              Should be called only when the GPE lists are semaphore locked
+ *              and not subject to change.
+ *
+ ******************************************************************************/
+
+struct acpi_gpe_event_info *
+acpi_ev_get_gpe_event_info (
+	acpi_handle                     gpe_device,
+	u32                             gpe_number)
+{
+	union acpi_operand_object       *obj_desc;
+	struct acpi_gpe_block_info      *gpe_block;
+	acpi_native_uint                i;
+
+
+	ACPI_FUNCTION_ENTRY ();
+
+
+	/* A NULL gpe_block means use the FADT-defined GPE block(s) */
+
+	if (!gpe_device) {
+		/* Examine GPE Block 0 and 1 (These blocks are permanent) */
+
+		for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
+			gpe_block = acpi_gbl_gpe_fadt_blocks[i];
+			if (gpe_block) {
+				if ((gpe_number >= gpe_block->block_base_number) &&
+					(gpe_number < gpe_block->block_base_number + (gpe_block->register_count * 8))) {
+					return (&gpe_block->event_info[gpe_number - gpe_block->block_base_number]);
+				}
+			}
+		}
+
+		/* The gpe_number was not in the range of either FADT GPE block */
+
+		return (NULL);
+	}
+
+	/*
+	 * A Non-null gpe_device means this is a GPE Block Device.
+	 */
+	obj_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) gpe_device);
+	if (!obj_desc ||
+		!obj_desc->device.gpe_block) {
+		return (NULL);
+	}
+
+	gpe_block = obj_desc->device.gpe_block;
+
+	if ((gpe_number >= gpe_block->block_base_number) &&
+		(gpe_number < gpe_block->block_base_number + (gpe_block->register_count * 8))) {
+		return (&gpe_block->event_info[gpe_number - gpe_block->block_base_number]);
+	}
+
+	return (NULL);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_gpe_detect
+ *
+ * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
+ *                                    Can have multiple GPE blocks attached.
+ *
+ * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
+ *
+ * DESCRIPTION: Detect if any GP events have occurred.  This function is
+ *              executed at interrupt level.
+ *
+ ******************************************************************************/
+
+u32
+acpi_ev_gpe_detect (
+	struct acpi_gpe_xrupt_info      *gpe_xrupt_list)
+{
+	u32                             int_status = ACPI_INTERRUPT_NOT_HANDLED;
+	u8                              enabled_status_byte;
+	u8                              bit_mask;
+	struct acpi_gpe_register_info   *gpe_register_info;
+	u32                             in_value;
+	acpi_status                     status;
+	struct acpi_gpe_block_info      *gpe_block;
+	u32                             gpe_number;
+	u32                             i;
+	u32                             j;
+
+
+	ACPI_FUNCTION_NAME ("ev_gpe_detect");
+
+
+	/* Examine all GPE blocks attached to this interrupt level */
+
+	acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_ISR);
+	gpe_block = gpe_xrupt_list->gpe_block_list_head;
+	while (gpe_block) {
+		/*
+		 * Read all of the 8-bit GPE status and enable registers
+		 * in this GPE block, saving all of them.
+		 * Find all currently active GP events.
+		 */
+		for (i = 0; i < gpe_block->register_count; i++) {
+			/* Get the next status/enable pair */
+
+			gpe_register_info = &gpe_block->register_info[i];
+
+			/* Read the Status Register */
+
+			status = acpi_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &in_value,
+					 &gpe_register_info->status_address);
+			gpe_register_info->status = (u8) in_value;
+			if (ACPI_FAILURE (status)) {
+				goto unlock_and_exit;
+			}
+
+			/* Read the Enable Register */
+
+			status = acpi_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &in_value,
+					 &gpe_register_info->enable_address);
+			gpe_register_info->enable = (u8) in_value;
+			if (ACPI_FAILURE (status)) {
+				goto unlock_and_exit;
+			}
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
+				"GPE pair: Status %8.8X%8.8X = %02X, Enable %8.8X%8.8X = %02X\n",
+				ACPI_HIDWORD (gpe_register_info->status_address.address),
+				ACPI_LODWORD (gpe_register_info->status_address.address),
+				gpe_register_info->status,
+				ACPI_HIDWORD (gpe_register_info->enable_address.address),
+				ACPI_LODWORD (gpe_register_info->enable_address.address),
+				gpe_register_info->enable));
+
+			/* First check if there is anything active at all in this register */
+
+			enabled_status_byte = (u8) (gpe_register_info->status &
+					   gpe_register_info->enable);
+			if (!enabled_status_byte) {
+				/* No active GPEs in this register, move on */
+
+				continue;
+			}
+
+			/* Now look at the individual GPEs in this byte register */
+
+			for (j = 0, bit_mask = 1; j < ACPI_GPE_REGISTER_WIDTH; j++, bit_mask <<= 1) {
+				/* Examine one GPE bit */
+
+				if (enabled_status_byte & bit_mask) {
+					/*
+					 * Found an active GPE. Dispatch the event to a handler
+					 * or method.
+					 */
+					gpe_number = (i * ACPI_GPE_REGISTER_WIDTH) + j;
+
+					int_status |= acpi_ev_gpe_dispatch (
+							  &gpe_block->event_info[gpe_number],
+							  gpe_number + gpe_block->register_info[gpe_number].base_gpe_number);
+				}
+			}
+		}
+
+		gpe_block = gpe_block->next;
+	}
+
+unlock_and_exit:
+
+	acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_ISR);
+	return (int_status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_asynch_execute_gpe_method
+ *
+ * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Perform the actual execution of a GPE control method.  This
+ *              function is called from an invocation of acpi_os_queue_for_execution
+ *              (and therefore does NOT execute at interrupt level) so that
+ *              the control method itself is not executed in the context of
+ *              an interrupt handler.
+ *
+ ******************************************************************************/
+
+static void ACPI_SYSTEM_XFACE
+acpi_ev_asynch_execute_gpe_method (
+	void                            *context)
+{
+	struct acpi_gpe_event_info      *gpe_event_info = (void *) context;
+	u32                             gpe_number = 0;
+	acpi_status                     status;
+	struct acpi_gpe_event_info      local_gpe_event_info;
+
+
+	ACPI_FUNCTION_TRACE ("ev_asynch_execute_gpe_method");
+
+
+	status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE (status)) {
+		return_VOID;
+	}
+
+	/* Must revalidate the gpe_number/gpe_block */
+
+	if (!acpi_ev_valid_gpe_event (gpe_event_info)) {
+		status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
+		return_VOID;
+	}
+
+	/*
+	 * Take a snapshot of the GPE info for this level - we copy the
+	 * info to prevent a race condition with remove_handler/remove_block.
+	 */
+	ACPI_MEMCPY (&local_gpe_event_info, gpe_event_info, sizeof (struct acpi_gpe_event_info));
+
+	status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE (status)) {
+		return_VOID;
+	}
+
+	if (local_gpe_event_info.method_node) {
+		/*
+		 * Invoke the GPE Method (_Lxx, _Exx):
+		 * (Evaluate the _Lxx/_Exx control method that corresponds to this GPE.)
+		 */
+		status = acpi_ns_evaluate_by_handle (local_gpe_event_info.method_node, NULL, NULL);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR (("%s while evaluating method [%4.4s] for GPE[%2X]\n",
+				acpi_format_exception (status),
+				local_gpe_event_info.method_node->name.ascii, gpe_number));
+		}
+	}
+
+	if (local_gpe_event_info.flags & ACPI_EVENT_LEVEL_TRIGGERED) {
+		/*
+		 * GPE is level-triggered, we clear the GPE status bit after handling
+		 * the event.
+		 */
+		status = acpi_hw_clear_gpe (&local_gpe_event_info);
+		if (ACPI_FAILURE (status)) {
+			return_VOID;
+		}
+	}
+
+	/* Enable this GPE */
+
+	(void) acpi_hw_enable_gpe (&local_gpe_event_info);
+	return_VOID;
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_gpe_dispatch
+ *
+ * PARAMETERS:  gpe_event_info  - info for this GPE
+ *              gpe_number      - Number relative to the parent GPE block
+ *
+ * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
+ *
+ * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
+ *              or method (e.g. _Lxx/_Exx) handler.
+ *
+ *              This function executes at interrupt level.
+ *
+ ******************************************************************************/
+
+u32
+acpi_ev_gpe_dispatch (
+	struct acpi_gpe_event_info      *gpe_event_info,
+	u32                             gpe_number)
+{
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_gpe_dispatch");
+
+
+	/*
+	 * If edge-triggered, clear the GPE status bit now.  Note that
+	 * level-triggered events are cleared after the GPE is serviced.
+	 */
+	if (gpe_event_info->flags & ACPI_EVENT_EDGE_TRIGGERED) {
+		status = acpi_hw_clear_gpe (gpe_event_info);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR (("acpi_ev_gpe_dispatch: Unable to clear GPE[%2X]\n",
+				gpe_number));
+			return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
+		}
+	}
+
+	/*
+	 * Dispatch the GPE to either an installed handler, or the control
+	 * method associated with this GPE (_Lxx or _Exx).
+	 * If a handler exists, we invoke it and do not attempt to run the method.
+	 * If there is neither a handler nor a method, we disable the level to
+	 * prevent further events from coming in here.
+	 */
+	if (gpe_event_info->handler) {
+		/* Invoke the installed handler (at interrupt level) */
+
+		gpe_event_info->handler (gpe_event_info->context);
+	}
+	else if (gpe_event_info->method_node) {
+		/*
+		 * Disable GPE, so it doesn't keep firing before the method has a
+		 * chance to run.
+		 */
+		status = acpi_hw_disable_gpe (gpe_event_info);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR (("acpi_ev_gpe_dispatch: Unable to disable GPE[%2X]\n",
+				gpe_number));
+			return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
+		}
+
+		/* Execute the method associated with the GPE. */
+
+		if (ACPI_FAILURE (acpi_os_queue_for_execution (OSD_PRIORITY_GPE,
+				 acpi_ev_asynch_execute_gpe_method,
+				 gpe_event_info))) {
+			ACPI_REPORT_ERROR ((
+				"acpi_ev_gpe_dispatch: Unable to queue handler for GPE[%2X], event is disabled\n",
+				gpe_number));
+		}
+	}
+	else {
+		/* No handler or method to run! */
+
+		ACPI_REPORT_ERROR ((
+			"acpi_ev_gpe_dispatch: No handler or method for GPE[%2X], disabling event\n",
+			gpe_number));
+
+		/*
+		 * Disable the GPE.  The GPE will remain disabled until the ACPI
+		 * Core Subsystem is restarted, or the handler is reinstalled.
+		 */
+		status = acpi_hw_disable_gpe (gpe_event_info);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR (("acpi_ev_gpe_dispatch: Unable to disable GPE[%2X]\n",
+				gpe_number));
+			return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
+		}
+	}
+
+	/* It is now safe to clear level-triggered events. */
+
+	if (gpe_event_info->flags & ACPI_EVENT_LEVEL_TRIGGERED) {
+		status = acpi_hw_clear_gpe (gpe_event_info);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR (("acpi_ev_gpe_dispatch: Unable to clear GPE[%2X]\n",
+				gpe_number));
+			return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
+		}
+	}
+
+	return_VALUE (ACPI_INTERRUPT_HANDLED);
+}
+