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Diffstat (limited to 'drivers/acpi/events/evmisc.c')
| -rw-r--r-- | drivers/acpi/events/evmisc.c | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/drivers/acpi/events/evmisc.c b/drivers/acpi/events/evmisc.c new file mode 100644 index 000000000000..2548efa7a45f --- /dev/null +++ b/drivers/acpi/events/evmisc.c @@ -0,0 +1,588 @@ +/****************************************************************************** + * + * Module Name: evmisc - Miscellaneous event manager support functions + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, 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> +#include <acpi/acinterp.h> + +#define _COMPONENT ACPI_EVENTS + ACPI_MODULE_NAME ("evmisc") + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_is_notify_object + * + * PARAMETERS: Node - Node to check + * + * RETURN: TRUE if notifies allowed on this object + * + * DESCRIPTION: Check type of node for a object that supports notifies. + * + * TBD: This could be replaced by a flag bit in the node. + * + ******************************************************************************/ + +u8 +acpi_ev_is_notify_object ( + struct acpi_namespace_node *node) +{ + switch (node->type) { + case ACPI_TYPE_DEVICE: + case ACPI_TYPE_PROCESSOR: + case ACPI_TYPE_POWER: + case ACPI_TYPE_THERMAL: + /* + * These are the ONLY objects that can receive ACPI notifications + */ + return (TRUE); + + default: + return (FALSE); + } +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_queue_notify_request + * + * PARAMETERS: Node - NS node for the notified object + * notify_value - Value from the Notify() request + * + * RETURN: Status + * + * DESCRIPTION: Dispatch a device notification event to a previously + * installed handler. + * + ******************************************************************************/ + +#ifdef ACPI_DEBUG_OUTPUT +static const char *acpi_notify_value_names[] = +{ + "Bus Check", + "Device Check", + "Device Wake", + "Eject request", + "Device Check Light", + "Frequency Mismatch", + "Bus Mode Mismatch", + "Power Fault" +}; +#endif + +acpi_status +acpi_ev_queue_notify_request ( + struct acpi_namespace_node *node, + u32 notify_value) +{ + union acpi_operand_object *obj_desc; + union acpi_operand_object *handler_obj = NULL; + union acpi_generic_state *notify_info; + acpi_status status = AE_OK; + + + ACPI_FUNCTION_NAME ("ev_queue_notify_request"); + + + /* + * For value 3 (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? + */ + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Dispatching Notify(%X) on node %p\n", notify_value, node)); + + if (notify_value <= 7) { + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: %s\n", + acpi_notify_value_names[notify_value])); + } + else { + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: 0x%2.2X **Device Specific**\n", + notify_value)); + } + + /* Get the notify object attached to the NS Node */ + + obj_desc = acpi_ns_get_attached_object (node); + if (obj_desc) { + /* We have the notify object, Get the right handler */ + + switch (node->type) { + case ACPI_TYPE_DEVICE: + case ACPI_TYPE_THERMAL: + case ACPI_TYPE_PROCESSOR: + case ACPI_TYPE_POWER: + + if (notify_value <= ACPI_MAX_SYS_NOTIFY) { + handler_obj = obj_desc->common_notify.system_notify; + } + else { + handler_obj = obj_desc->common_notify.device_notify; + } + break; + + default: + /* All other types are not supported */ + return (AE_TYPE); + } + } + + /* If there is any handler to run, schedule the dispatcher */ + + if ((acpi_gbl_system_notify.handler && (notify_value <= ACPI_MAX_SYS_NOTIFY)) || + (acpi_gbl_device_notify.handler && (notify_value > ACPI_MAX_SYS_NOTIFY)) || + handler_obj) { + notify_info = acpi_ut_create_generic_state (); + if (!notify_info) { + return (AE_NO_MEMORY); + } + + notify_info->common.data_type = ACPI_DESC_TYPE_STATE_NOTIFY; + notify_info->notify.node = node; + notify_info->notify.value = (u16) notify_value; + notify_info->notify.handler_obj = handler_obj; + + status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH, + acpi_ev_notify_dispatch, notify_info); + if (ACPI_FAILURE (status)) { + acpi_ut_delete_generic_state (notify_info); + } + } + + if (!handler_obj) { + /* + * There is no per-device notify handler for this device. + * This may or may not be a problem. + */ + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "No notify handler for Notify(%4.4s, %X) node %p\n", + acpi_ut_get_node_name (node), notify_value, node)); + } + + return (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_notify_dispatch + * + * PARAMETERS: Context - To be passsed to the notify handler + * + * RETURN: None. + * + * DESCRIPTION: Dispatch a device notification event to a previously + * installed handler. + * + ******************************************************************************/ + +void ACPI_SYSTEM_XFACE +acpi_ev_notify_dispatch ( + void *context) +{ + union acpi_generic_state *notify_info = (union acpi_generic_state *) context; + acpi_notify_handler global_handler = NULL; + void *global_context = NULL; + union acpi_operand_object *handler_obj; + + + ACPI_FUNCTION_ENTRY (); + + + /* + * We will invoke a global notify handler if installed. + * This is done _before_ we invoke the per-device handler attached to the device. + */ + if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) { + /* Global system notification handler */ + + if (acpi_gbl_system_notify.handler) { + global_handler = acpi_gbl_system_notify.handler; + global_context = acpi_gbl_system_notify.context; + } + } + else { + /* Global driver notification handler */ + + if (acpi_gbl_device_notify.handler) { + global_handler = acpi_gbl_device_notify.handler; + global_context = acpi_gbl_device_notify.context; + } + } + + /* Invoke the system handler first, if present */ + + if (global_handler) { + global_handler (notify_info->notify.node, notify_info->notify.value, global_context); + } + + /* Now invoke the per-device handler, if present */ + + handler_obj = notify_info->notify.handler_obj; + if (handler_obj) { + handler_obj->notify.handler (notify_info->notify.node, notify_info->notify.value, + handler_obj->notify.context); + } + + /* All done with the info object */ + + acpi_ut_delete_generic_state (notify_info); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_global_lock_thread + * + * PARAMETERS: Context - From thread interface, not used + * + * RETURN: None + * + * DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the + * Global Lock. Simply signal all threads that are waiting + * for the lock. + * + ******************************************************************************/ + +static void ACPI_SYSTEM_XFACE +acpi_ev_global_lock_thread ( + void *context) +{ + acpi_status status; + + + /* Signal threads that are waiting for the lock */ + + if (acpi_gbl_global_lock_thread_count) { + /* Send sufficient units to the semaphore */ + + status = acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore, + acpi_gbl_global_lock_thread_count); + if (ACPI_FAILURE (status)) { + ACPI_REPORT_ERROR (("Could not signal Global Lock semaphore\n")); + } + } +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_global_lock_handler + * + * PARAMETERS: Context - From thread interface, not used + * + * RETURN: ACPI_INTERRUPT_HANDLED or ACPI_INTERRUPT_NOT_HANDLED + * + * 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 + * + ******************************************************************************/ + +static u32 +acpi_ev_global_lock_handler ( + void *context) +{ + u8 acquired = FALSE; + acpi_status status; + + + /* + * 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. + */ + ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.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 */ + + status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH, + acpi_ev_global_lock_thread, context); + if (ACPI_FAILURE (status)) { + ACPI_REPORT_ERROR (("Could not queue Global Lock thread, %s\n", + acpi_format_exception (status))); + + return (ACPI_INTERRUPT_NOT_HANDLED); + } + } + + return (ACPI_INTERRUPT_HANDLED); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_init_global_lock_handler + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Install a handler for the global lock release event + * + ******************************************************************************/ + +acpi_status +acpi_ev_init_global_lock_handler (void) +{ + acpi_status status; + + + ACPI_FUNCTION_TRACE ("ev_init_global_lock_handler"); + + + acpi_gbl_global_lock_present = TRUE; + status = acpi_install_fixed_event_handler (ACPI_EVENT_GLOBAL, + acpi_ev_global_lock_handler, NULL); + + /* + * If the global lock does not exist on this platform, the attempt + * to enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick) + * Map to AE_OK, but mark global lock as not present. + * Any attempt to actually use the global lock will be flagged + * with an error. + */ + if (status == AE_NO_HARDWARE_RESPONSE) { + acpi_gbl_global_lock_present = FALSE; + status = AE_OK; + } + + return_ACPI_STATUS (status); +} + + +/****************************************************************************** + * + * FUNCTION: acpi_ev_acquire_global_lock + * + * PARAMETERS: Timeout - Max time to wait for the lock, in millisec. + * + * RETURN: Status + * + * DESCRIPTION: Attempt to gain ownership of the Global Lock. + * + *****************************************************************************/ + +acpi_status +acpi_ev_acquire_global_lock ( + u16 timeout) +{ + acpi_status status = AE_OK; + u8 acquired = FALSE; + + + ACPI_FUNCTION_TRACE ("ev_acquire_global_lock"); + + +#ifndef ACPI_APPLICATION + /* Make sure that we actually have a global lock */ + + if (!acpi_gbl_global_lock_present) { + return_ACPI_STATUS (AE_NO_GLOBAL_LOCK); + } +#endif + + /* One more thread wants the global lock */ + + acpi_gbl_global_lock_thread_count++; + + /* If we (OS side vs. BIOS side) have the hardware lock already, we are done */ + + if (acpi_gbl_global_lock_acquired) { + return_ACPI_STATUS (AE_OK); + } + + /* We must acquire the actual hardware lock */ + + ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, acquired); + if (acquired) { + /* We got the lock */ + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Acquired the HW Global Lock\n")); + + acpi_gbl_global_lock_acquired = TRUE; + return_ACPI_STATUS (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. + */ + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Waiting for the HW Global Lock\n")); + + /* + * Acquire the global lock semaphore first. + * Since this wait will block, we must release the interpreter + */ + status = acpi_ex_system_wait_semaphore (acpi_gbl_global_lock_semaphore, + timeout); + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_release_global_lock + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Releases ownership of the Global Lock. + * + ******************************************************************************/ + +acpi_status +acpi_ev_release_global_lock (void) +{ + u8 pending = FALSE; + acpi_status status = AE_OK; + + + ACPI_FUNCTION_TRACE ("ev_release_global_lock"); + + + if (!acpi_gbl_global_lock_thread_count) { + ACPI_REPORT_WARNING(("Cannot release HW Global Lock, it has not been acquired\n")); + return_ACPI_STATUS (AE_NOT_ACQUIRED); + } + + /* One fewer thread has the global lock */ + + acpi_gbl_global_lock_thread_count--; + if (acpi_gbl_global_lock_thread_count) { + /* There are still some threads holding the lock, cannot release */ + + return_ACPI_STATUS (AE_OK); + } + + /* + * No more threads holding lock, we can do the actual hardware + * release + */ + ACPI_RELEASE_GLOBAL_LOCK (acpi_gbl_common_fACS.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) { + status = acpi_set_register (ACPI_BITREG_GLOBAL_LOCK_RELEASE, 1, ACPI_MTX_LOCK); + } + + return_ACPI_STATUS (status); +} + + +/****************************************************************************** + * + * FUNCTION: acpi_ev_terminate + * + * PARAMETERS: none + * + * RETURN: none + * + * DESCRIPTION: Disable events and free memory allocated for table storage. + * + ******************************************************************************/ + +void +acpi_ev_terminate (void) +{ + acpi_native_uint i; + acpi_status status; + + + ACPI_FUNCTION_TRACE ("ev_terminate"); + + + if (acpi_gbl_events_initialized) { + /* + * Disable all event-related functionality. + * In all cases, on error, print a message but obviously we don't abort. + */ + + /* Disable all fixed events */ + + for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { + status = acpi_disable_event ((u32) i, 0); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not disable fixed event %d\n", (u32) i)); + } + } + + /* Disable all GPEs in all GPE blocks */ + + status = acpi_ev_walk_gpe_list (acpi_hw_disable_gpe_block, ACPI_NOT_ISR); + + /* Remove SCI handler */ + + status = acpi_ev_remove_sci_handler (); + if (ACPI_FAILURE(status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not remove SCI handler\n")); + } + } + + /* Deallocate all handler objects installed within GPE info structs */ + + status = acpi_ev_walk_gpe_list (acpi_ev_delete_gpe_handlers, ACPI_NOT_ISR); + + /* Return to original mode if necessary */ + + if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) { + status = acpi_disable (); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_disable failed\n")); + } + } + return_VOID; +} + |