diff options
Diffstat (limited to 'drivers/acpi/events/evsci.c')
| -rw-r--r-- | drivers/acpi/events/evsci.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/drivers/acpi/events/evsci.c b/drivers/acpi/events/evsci.c new file mode 100644 index 000000000000..46b31995c827 --- /dev/null +++ b/drivers/acpi/events/evsci.c @@ -0,0 +1,199 @@ +/******************************************************************************* + * + * Module Name: evsci - System Control Interrupt configuration and + * legacy to ACPI mode state transition 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> + + +#define _COMPONENT ACPI_EVENTS + ACPI_MODULE_NAME ("evsci") + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_sci_xrupt_handler + * + * PARAMETERS: Context - Calling Context + * + * RETURN: Status code indicates whether interrupt was handled. + * + * DESCRIPTION: Interrupt handler that will figure out what function or + * control method to call to deal with a SCI. + * + ******************************************************************************/ + +static u32 ACPI_SYSTEM_XFACE +acpi_ev_sci_xrupt_handler ( + void *context) +{ + struct acpi_gpe_xrupt_info *gpe_xrupt_list = context; + u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED; + + + ACPI_FUNCTION_TRACE("ev_sci_xrupt_handler"); + + + /* + * We are guaranteed by the ACPI CA initialization/shutdown code that + * if this interrupt handler is installed, ACPI is enabled. + */ + + /* + * Fixed Events: + * Check for and dispatch any Fixed Events that have occurred + */ + interrupt_handled |= acpi_ev_fixed_event_detect (); + + /* + * General Purpose Events: + * Check for and dispatch any GPEs that have occurred + */ + interrupt_handled |= acpi_ev_gpe_detect (gpe_xrupt_list); + + return_VALUE (interrupt_handled); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_gpe_xrupt_handler + * + * PARAMETERS: Context - Calling Context + * + * RETURN: Status code indicates whether interrupt was handled. + * + * DESCRIPTION: Handler for GPE Block Device interrupts + * + ******************************************************************************/ + +u32 ACPI_SYSTEM_XFACE +acpi_ev_gpe_xrupt_handler ( + void *context) +{ + struct acpi_gpe_xrupt_info *gpe_xrupt_list = context; + u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED; + + + ACPI_FUNCTION_TRACE("ev_gpe_xrupt_handler"); + + + /* + * We are guaranteed by the ACPI CA initialization/shutdown code that + * if this interrupt handler is installed, ACPI is enabled. + */ + + /* + * GPEs: + * Check for and dispatch any GPEs that have occurred + */ + interrupt_handled |= acpi_ev_gpe_detect (gpe_xrupt_list); + + return_VALUE (interrupt_handled); +} + + +/****************************************************************************** + * + * FUNCTION: acpi_ev_install_sci_handler + * + * PARAMETERS: none + * + * RETURN: Status + * + * DESCRIPTION: Installs SCI handler. + * + ******************************************************************************/ + +u32 +acpi_ev_install_sci_handler (void) +{ + u32 status = AE_OK; + + + ACPI_FUNCTION_TRACE ("ev_install_sci_handler"); + + + status = acpi_os_install_interrupt_handler ((u32) acpi_gbl_FADT->sci_int, + acpi_ev_sci_xrupt_handler, acpi_gbl_gpe_xrupt_list_head); + return_ACPI_STATUS (status); +} + + +/****************************************************************************** + * + * FUNCTION: acpi_ev_remove_sci_handler + * + * PARAMETERS: none + * + * RETURN: E_OK if handler uninstalled OK, E_ERROR if handler was not + * installed to begin with + * + * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be + * taken. + * + * Note: It doesn't seem important to disable all events or set the event + * enable registers to their original values. The OS should disable + * the SCI interrupt level when the handler is removed, so no more + * events will come in. + * + ******************************************************************************/ + +acpi_status +acpi_ev_remove_sci_handler (void) +{ + acpi_status status; + + + ACPI_FUNCTION_TRACE ("ev_remove_sci_handler"); + + + /* Just let the OS remove the handler and disable the level */ + + status = acpi_os_remove_interrupt_handler ((u32) acpi_gbl_FADT->sci_int, + acpi_ev_sci_xrupt_handler); + + return_ACPI_STATUS (status); +} + + |