drivers/acpi/events/evsci.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: evsci - System Control Interrupt configuration and
   4  *                      legacy to ACPI mode state transition functions
   5  *
   6  ******************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2006, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  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
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acevents.h>
  47
  48 #define _COMPONENT          ACPI_EVENTS
  49 ACPI_MODULE_NAME("evsci")
  50
  51 /* Local prototypes */
  52 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ev_sci_xrupt_handler
  57  *
  58  * PARAMETERS:  Context   - Calling Context
  59  *
  60  * RETURN:      Status code indicates whether interrupt was handled.
  61  *
  62  * DESCRIPTION: Interrupt handler that will figure out what function or
  63  *              control method to call to deal with a SCI.
  64  *
  65  ******************************************************************************/
  66
  67 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
  68 {
  69         struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
  70         u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
  71
  72         ACPI_FUNCTION_TRACE("ev_sci_xrupt_handler");
  73
  74         /*
  75          * We are guaranteed by the ACPI CA initialization/shutdown code that
  76          * if this interrupt handler is installed, ACPI is enabled.
  77          */
  78
  79         /*
  80          * Fixed Events:
  81          * Check for and dispatch any Fixed Events that have occurred
  82          */
  83         interrupt_handled |= acpi_ev_fixed_event_detect();
  84
  85         /*
  86          * General Purpose Events:
  87          * Check for and dispatch any GPEs that have occurred
  88          */
  89         interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
  90
  91         return_UINT32(interrupt_handled);
  92 }
  93
  94 /*******************************************************************************
  95  *
  96  * FUNCTION:    acpi_ev_gpe_xrupt_handler
  97  *
  98  * PARAMETERS:  Context   - Calling Context
  99  *
 100  * RETURN:      Status code indicates whether interrupt was handled.
 101  *
 102  * DESCRIPTION: Handler for GPE Block Device interrupts
 103  *
 104  ******************************************************************************/
 105
 106 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
 107 {
 108         struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
 109         u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
 110
 111         ACPI_FUNCTION_TRACE("ev_gpe_xrupt_handler");
 112
 113         /*
 114          * We are guaranteed by the ACPI CA initialization/shutdown code that
 115          * if this interrupt handler is installed, ACPI is enabled.
 116          */
 117
 118         /*
 119          * GPEs:
 120          * Check for and dispatch any GPEs that have occurred
 121          */
 122         interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
 123
 124         return_UINT32(interrupt_handled);
 125 }
 126
 127 /******************************************************************************
 128  *
 129  * FUNCTION:    acpi_ev_install_sci_handler
 130  *
 131  * PARAMETERS:  none
 132  *
 133  * RETURN:      Status
 134  *
 135  * DESCRIPTION: Installs SCI handler.
 136  *
 137  ******************************************************************************/
 138
 139 u32 acpi_ev_install_sci_handler(void)
 140 {
 141         u32 status = AE_OK;
 142
 143         ACPI_FUNCTION_TRACE("ev_install_sci_handler");
 144
 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);
 149 }
 150
 151 /******************************************************************************
 152  *
 153  * FUNCTION:    acpi_ev_remove_sci_handler
 154  *
 155  * PARAMETERS:  none
 156  *
 157  * RETURN:      E_OK if handler uninstalled OK, E_ERROR if handler was not
 158  *              installed to begin with
 159  *
 160  * DESCRIPTION: Remove the SCI interrupt handler.  No further SCIs will be
 161  *              taken.
 162  *
 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.
 167  *
 168  ******************************************************************************/
 169
 170 acpi_status acpi_ev_remove_sci_handler(void)
 171 {
 172         acpi_status status;
 173
 174         ACPI_FUNCTION_TRACE("ev_remove_sci_handler");
 175
 176         /* Just let the OS remove the handler and disable the level */
 177
 178         status = acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT->sci_int,
 179                                                   acpi_ev_sci_xrupt_handler);
 180
 181         return_ACPI_STATUS(status);
 182 }