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 - 2005, 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
  49 #define _COMPONENT          ACPI_EVENTS
  50          ACPI_MODULE_NAME    ("evsci")
  51
  52 /* Local prototypes */
  53
  54 static u32 ACPI_SYSTEM_XFACE
  55 acpi_ev_sci_xrupt_handler (
  56         void                            *context);
  57
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_ev_sci_xrupt_handler
  62  *
  63  * PARAMETERS:  Context   - Calling Context
  64  *
  65  * RETURN:      Status code indicates whether interrupt was handled.
  66  *
  67  * DESCRIPTION: Interrupt handler that will figure out what function or
  68  *              control method to call to deal with a SCI.
  69  *
  70  ******************************************************************************/
  71
  72 static u32 ACPI_SYSTEM_XFACE
  73 acpi_ev_sci_xrupt_handler (
  74         void                            *context)
  75 {
  76         struct acpi_gpe_xrupt_info      *gpe_xrupt_list = context;
  77         u32                             interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
  78
  79
  80         ACPI_FUNCTION_TRACE("ev_sci_xrupt_handler");
  81
  82
  83         /*
  84          * We are guaranteed by the ACPI CA initialization/shutdown code that
  85          * if this interrupt handler is installed, ACPI is enabled.
  86          */
  87
  88         /*
  89          * Fixed Events:
  90          * Check for and dispatch any Fixed Events that have occurred
  91          */
  92         interrupt_handled |= acpi_ev_fixed_event_detect ();
  93
  94         /*
  95          * General Purpose Events:
  96          * Check for and dispatch any GPEs that have occurred
  97          */
  98         interrupt_handled |= acpi_ev_gpe_detect (gpe_xrupt_list);
  99
 100         return_VALUE (interrupt_handled);
 101 }
 102
 103
 104 /*******************************************************************************
 105  *
 106  * FUNCTION:    acpi_ev_gpe_xrupt_handler
 107  *
 108  * PARAMETERS:  Context   - Calling Context
 109  *
 110  * RETURN:      Status code indicates whether interrupt was handled.
 111  *
 112  * DESCRIPTION: Handler for GPE Block Device interrupts
 113  *
 114  ******************************************************************************/
 115
 116 u32 ACPI_SYSTEM_XFACE
 117 acpi_ev_gpe_xrupt_handler (
 118         void                            *context)
 119 {
 120         struct acpi_gpe_xrupt_info      *gpe_xrupt_list = context;
 121         u32                             interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
 122
 123
 124         ACPI_FUNCTION_TRACE("ev_gpe_xrupt_handler");
 125
 126
 127         /*
 128          * We are guaranteed by the ACPI CA initialization/shutdown code that
 129          * if this interrupt handler is installed, ACPI is enabled.
 130          */
 131
 132         /*
 133          * GPEs:
 134          * Check for and dispatch any GPEs that have occurred
 135          */
 136         interrupt_handled |= acpi_ev_gpe_detect (gpe_xrupt_list);
 137
 138         return_VALUE (interrupt_handled);
 139 }
 140
 141
 142 /******************************************************************************
 143  *
 144  * FUNCTION:    acpi_ev_install_sci_handler
 145  *
 146  * PARAMETERS:  none
 147  *
 148  * RETURN:      Status
 149  *
 150  * DESCRIPTION: Installs SCI handler.
 151  *
 152  ******************************************************************************/
 153
 154 u32
 155 acpi_ev_install_sci_handler (
 156         void)
 157 {
 158         u32                             status = AE_OK;
 159
 160
 161         ACPI_FUNCTION_TRACE ("ev_install_sci_handler");
 162
 163
 164         status = acpi_os_install_interrupt_handler ((u32) acpi_gbl_FADT->sci_int,
 165                            acpi_ev_sci_xrupt_handler, acpi_gbl_gpe_xrupt_list_head);
 166         return_ACPI_STATUS (status);
 167 }
 168
 169
 170 /******************************************************************************
 171  *
 172  * FUNCTION:    acpi_ev_remove_sci_handler
 173  *
 174  * PARAMETERS:  none
 175  *
 176  * RETURN:      E_OK if handler uninstalled OK, E_ERROR if handler was not
 177  *              installed to begin with
 178  *
 179  * DESCRIPTION: Remove the SCI interrupt handler.  No further SCIs will be
 180  *              taken.
 181  *
 182  * Note:  It doesn't seem important to disable all events or set the event
 183  *        enable registers to their original values.  The OS should disable
 184  *        the SCI interrupt level when the handler is removed, so no more
 185  *        events will come in.
 186  *
 187  ******************************************************************************/
 188
 189 acpi_status
 190 acpi_ev_remove_sci_handler (
 191         void)
 192 {
 193         acpi_status                     status;
 194
 195
 196         ACPI_FUNCTION_TRACE ("ev_remove_sci_handler");
 197
 198
 199         /* Just let the OS remove the handler and disable the level */
 200
 201         status = acpi_os_remove_interrupt_handler ((u32) acpi_gbl_FADT->sci_int,
 202                            acpi_ev_sci_xrupt_handler);
 203
 204         return_ACPI_STATUS (status);
 205 }
 206
 207