patch-2.4.0-test3 linux/drivers/acpi/events/evmisc.c

• Lines: 358
• Date: Wed Jul 5 11:23:12 2000
• Orig file: v2.4.0-test2/linux/drivers/acpi/events/evmisc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/events/evmisc.c linux/drivers/acpi/events/evmisc.c
@@ -0,0 +1,357 @@
+/******************************************************************************
+ *
+ * Module Name: evmisc - ACPI device notification handler dispatch
+ *                       and ACPI Global Lock support
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000 R. Byron Moore
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "acpi.h"
+#include "events.h"
+#include "namesp.h"
+#include "interp.h"
+#include "hardware.h"
+
+#define _COMPONENT          EVENT_HANDLING
+	 MODULE_NAME         ("evmisc");
+
+
+/**************************************************************************
+ *
+ * FUNCTION:    Acpi_ev_notify_dispatch
+ *
+ * PARAMETERS:
+ *
+ * RETURN:      None.
+ *
+ * DESCRIPTION: Dispatch a device notification event to a previously
+ *              installed handler.
+ *
+ *************************************************************************/
+
+void
+acpi_ev_notify_dispatch (
+	ACPI_HANDLE             device,
+	u32                     notify_value)
+{
+	ACPI_OBJECT_INTERNAL    *obj_desc;
+	ACPI_OBJECT_INTERNAL    *handler_obj;
+	NOTIFY_HANDLER          handler;
+
+
+	/*
+	 * For value 1 (Ejection Request), some device method may need to be run.
+	 * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need to be run.
+	 * For value 0x80 (Status Change) on the power button or sleep button,
+	 * initiate soft-off or sleep operation?
+	 */
+
+
+	switch (notify_value)
+	{
+	case 0:
+		break;
+
+	case 1:
+		break;
+
+	case 2:
+		break;
+
+	case 0x80:
+		break;
+
+	default:
+		break;
+	}
+
+
+	/*
+	 * Invoke a global notify handler if installed.
+	 * This is done _before_ we invoke the per-device handler attached to the device.
+	 */
+
+	if (notify_value <= MAX_SYS_NOTIFY) {
+		/* Global system notification handler */
+
+		if (acpi_gbl_sys_notify.handler) {
+			acpi_gbl_sys_notify.handler (device, notify_value,
+					  acpi_gbl_sys_notify.context);
+		}
+	}
+
+	else {
+		/* Global driver notification handler */
+
+		if (acpi_gbl_drv_notify.handler) {
+			acpi_gbl_drv_notify.handler (device, notify_value,
+					  acpi_gbl_drv_notify.context);
+		}
+	}
+
+
+	/*
+	 * Get the notify object which must be attached to the device NTE
+	 */
+
+	obj_desc = acpi_ns_get_attached_object ((ACPI_HANDLE) device);
+	if (!obj_desc) {
+		/* There can be no notify handler for this device */
+
+		return;
+	}
+
+
+	/* We have the notify object, Get the right handler */
+
+	if (notify_value <= MAX_SYS_NOTIFY) {
+		handler_obj = obj_desc->device.sys_handler;
+	}
+	else {
+		handler_obj = obj_desc->device.drv_handler;
+	}
+
+	/* Validate the handler */
+
+	if (!handler_obj) {
+		/* There is no notify handler for this device */
+
+		return;
+	}
+
+	/* There is a handler, invoke it */
+
+	handler = handler_obj->notify_handler.handler;
+	handler (device, notify_value, handler_obj->notify_handler.context);
+
+}
+
+
+/***************************************************************************
+ *
+ * FUNCTION:    Acpi_ev_global_lock_thread
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
+ *              Global Lock.  Simply signal all threads that are waiting
+ *              for the lock.
+ *
+ **************************************************************************/
+
+void
+acpi_ev_global_lock_thread (
+	void                    *context)
+{
+
+	/* Signal threads that are waiting for the lock */
+
+	if (acpi_gbl_global_lock_thread_count) {
+		/* Send sufficient units to the semaphore */
+
+		acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore,
+				 acpi_gbl_global_lock_thread_count);
+	}
+}
+
+
+/***************************************************************************
+ *
+ * FUNCTION:    Acpi_ev_global_lock_handler
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Invoked directly from the SCI handler when a global lock
+ *              release interrupt occurs.  Grab the global lock and queue
+ *              the global lock thread for execution
+ *
+ **************************************************************************/
+
+u32
+acpi_ev_global_lock_handler (
+	void                    *context)
+{
+	u8                      acquired = FALSE;
+	void                    *global_lock;
+
+
+	/*
+	 * Attempt to get the lock
+	 * If we don't get it now, it will be marked pending and we will
+	 * take another interrupt when it becomes free.
+	 */
+
+	global_lock = &acpi_gbl_FACS->global_lock;
+	ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired);
+	if (acquired) {
+		/* Got the lock, now wake all threads waiting for it */
+
+		acpi_gbl_global_lock_acquired = TRUE;
+
+		/* Run the Global Lock thread which will signal all waiting threads */
+
+		acpi_os_queue_for_execution (OSD_PRIORITY_HIGH, acpi_ev_global_lock_thread,
+				  context);
+	}
+
+	return INTERRUPT_HANDLED;
+}
+
+
+/***************************************************************************
+ *
+ * FUNCTION:    Acpi_ev_init_global_lock_handler
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for the global lock release event
+ *
+ **************************************************************************/
+
+ACPI_STATUS
+acpi_ev_init_global_lock_handler (void)
+{
+	ACPI_STATUS             status;
+
+
+	status = acpi_install_fixed_event_handler (ACPI_EVENT_GLOBAL,
+			  acpi_ev_global_lock_handler, NULL);
+
+	return (status);
+}
+
+
+/***************************************************************************
+ *
+ * FUNCTION:    Acpi_ev_acquire_global_lock
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Attempt to gain ownership of the Global Lock.
+ *
+ **************************************************************************/
+
+ACPI_STATUS
+acpi_ev_acquire_global_lock(void)
+{
+	ACPI_STATUS             status = AE_OK;
+	u8                      acquired = FALSE;
+	void                    *global_lock;
+
+
+	/* One more thread wants the global lock */
+
+	acpi_gbl_global_lock_thread_count++;
+
+
+	/* If we (OS side) have the hardware lock already, we are done */
+
+	if (acpi_gbl_global_lock_acquired) {
+		return (AE_OK);
+	}
+
+	/* Only if the FACS is valid */
+
+	if (!acpi_gbl_FACS) {
+		return (AE_OK);
+	}
+
+
+	/* We must acquire the actualy hardware lock */
+
+	global_lock = &acpi_gbl_FACS->global_lock;
+	ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired);
+	if (acquired) {
+	   /* We got the lock */
+
+		acpi_gbl_global_lock_acquired = TRUE;
+
+		return (AE_OK);
+	}
+
+
+	/*
+	 * Did not get the lock.  The pending bit was set above, and we must now
+	 * wait until we get the global lock released interrupt.
+	 */
+
+	 /*
+	  * Acquire the global lock semaphore first.
+	  * Since this wait will block, we must release the interpreter
+	  */
+
+	acpi_aml_exit_interpreter ();
+	status = acpi_aml_system_wait_semaphore (acpi_gbl_global_lock_semaphore,
+			  ACPI_UINT32_MAX);
+	acpi_aml_enter_interpreter ();
+
+
+	return (status);
+}
+
+
+/***************************************************************************
+ *
+ * FUNCTION:    Acpi_ev_release_global_lock
+ *
+ * DESCRIPTION: Releases ownership of the Global Lock.
+ *
+ **************************************************************************/
+
+void
+acpi_ev_release_global_lock (void)
+{
+	u8                      pending = FALSE;
+	void                    *global_lock;
+
+
+	if (!acpi_gbl_FACS) {
+		return;
+	}
+
+   /* One fewer thread has the global lock */
+
+	acpi_gbl_global_lock_thread_count--;
+
+
+	/* Have all threads released the lock? */
+
+	if (!acpi_gbl_global_lock_thread_count) {
+		/*
+		 * No more threads holding lock, we can do the actual hardware
+		 * release
+		 */
+
+		global_lock = &acpi_gbl_FACS->global_lock;
+		ACPI_RELEASE_GLOBAL_LOCK (global_lock, pending);
+		acpi_gbl_global_lock_acquired = FALSE;
+
+		/*
+		 * If the pending bit was set, we must write GBL_RLS to the control
+		 * register
+		 */
+		if (pending) {
+			acpi_hw_register_access (ACPI_WRITE, ACPI_MTX_LOCK,
+					 (s32)PM1_CONTROL | GBL_RLS, 1);
+		}
+	}
+
+	return;
+}