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