1 /*******************************************************************************
3 * Module Name: evsci - System Control Interrupt configuration and
4 * legacy to ACPI mode state transition functions
6 ******************************************************************************/
9 * Copyright (C) 2000 - 2006, R. Byron Moore
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
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24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
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45 #include <acpi/acpi.h>
46 #include <acpi/acevents.h>
48 #define _COMPONENT ACPI_EVENTS
49 ACPI_MODULE_NAME("evsci")
51 /* Local prototypes */
52 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
54 /*******************************************************************************
56 * FUNCTION: acpi_ev_sci_xrupt_handler
58 * PARAMETERS: Context - Calling Context
60 * RETURN: Status code indicates whether interrupt was handled.
62 * DESCRIPTION: Interrupt handler that will figure out what function or
63 * control method to call to deal with a SCI.
65 ******************************************************************************/
67 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
69 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
70 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
72 ACPI_FUNCTION_TRACE("ev_sci_xrupt_handler");
75 * We are guaranteed by the ACPI CA initialization/shutdown code that
76 * if this interrupt handler is installed, ACPI is enabled.
81 * Check for and dispatch any Fixed Events that have occurred
83 interrupt_handled |= acpi_ev_fixed_event_detect();
86 * General Purpose Events:
87 * Check for and dispatch any GPEs that have occurred
89 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
91 return_UINT32(interrupt_handled);
94 /*******************************************************************************
96 * FUNCTION: acpi_ev_gpe_xrupt_handler
98 * PARAMETERS: Context - Calling Context
100 * RETURN: Status code indicates whether interrupt was handled.
102 * DESCRIPTION: Handler for GPE Block Device interrupts
104 ******************************************************************************/
106 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
108 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
109 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
111 ACPI_FUNCTION_TRACE("ev_gpe_xrupt_handler");
114 * We are guaranteed by the ACPI CA initialization/shutdown code that
115 * if this interrupt handler is installed, ACPI is enabled.
120 * Check for and dispatch any GPEs that have occurred
122 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
124 return_UINT32(interrupt_handled);
127 /******************************************************************************
129 * FUNCTION: acpi_ev_install_sci_handler
135 * DESCRIPTION: Installs SCI handler.
137 ******************************************************************************/
139 u32 acpi_ev_install_sci_handler(void)
143 ACPI_FUNCTION_TRACE("ev_install_sci_handler");
145 status = acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT->sci_int,
146 acpi_ev_sci_xrupt_handler,
147 acpi_gbl_gpe_xrupt_list_head);
148 return_ACPI_STATUS(status);
151 /******************************************************************************
153 * FUNCTION: acpi_ev_remove_sci_handler
157 * RETURN: E_OK if handler uninstalled OK, E_ERROR if handler was not
158 * installed to begin with
160 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
163 * Note: It doesn't seem important to disable all events or set the event
164 * enable registers to their original values. The OS should disable
165 * the SCI interrupt level when the handler is removed, so no more
166 * events will come in.
168 ******************************************************************************/
170 acpi_status acpi_ev_remove_sci_handler(void)
174 ACPI_FUNCTION_TRACE("ev_remove_sci_handler");
176 /* Just let the OS remove the handler and disable the level */
178 status = acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT->sci_int,
179 acpi_ev_sci_xrupt_handler);
181 return_ACPI_STATUS(status);