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hwgpe.c

/******************************************************************************
 *
 * Module Name: hwgpe - Low level GPE enable/disable/clear functions
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, 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_HARDWARE
ACPI_MODULE_NAME("hwgpe")

/* Local prototypes */
static acpi_status
acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
                        struct acpi_gpe_block_info *gpe_block);

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_write_gpe_enable_reg
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to be enabled
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Write a GPE enable register.  Note: The bit for this GPE must
 *              already be cleared or set in the parent register
 *              enable_for_run mask.
 *
 ******************************************************************************/

acpi_status
acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info *gpe_event_info)
{
      struct acpi_gpe_register_info *gpe_register_info;
      acpi_status status;

      ACPI_FUNCTION_ENTRY();

      /* Get the info block for the entire GPE register */

      gpe_register_info = gpe_event_info->register_info;
      if (!gpe_register_info) {
            return (AE_NOT_EXIST);
      }

      /* Write the entire GPE (runtime) enable register */

      status = acpi_hw_low_level_write(8, gpe_register_info->enable_for_run,
                               &gpe_register_info->enable_address);

      return (status);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_clear_gpe
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear the status bit for a single GPE.
 *
 ******************************************************************************/

acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
{
      acpi_status status;
      u8 register_bit;

      ACPI_FUNCTION_ENTRY();

      register_bit = (u8)
          (1 <<
           (gpe_event_info->gpe_number -
            gpe_event_info->register_info->base_gpe_number));

      /*
       * Write a one to the appropriate bit in the status register to
       * clear this GPE.
       */
      status = acpi_hw_low_level_write(8, register_bit,
                               &gpe_event_info->register_info->
                               status_address);

      return (status);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_get_gpe_status
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 *              event_status        - Where the GPE status is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Return the status of a single GPE.
 *
 ******************************************************************************/

#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
                   acpi_event_status * event_status)
{
      u32 in_byte;
      u8 register_bit;
      struct acpi_gpe_register_info *gpe_register_info;
      acpi_status status;
      acpi_event_status local_event_status = 0;

      ACPI_FUNCTION_ENTRY();

      if (!event_status) {
            return (AE_BAD_PARAMETER);
      }

      /* Get the info block for the entire GPE register */

      gpe_register_info = gpe_event_info->register_info;

      /* Get the register bitmask for this GPE */

      register_bit = (u8)
          (1 <<
           (gpe_event_info->gpe_number -
            gpe_event_info->register_info->base_gpe_number));

      /* GPE currently enabled? (enabled for runtime?) */

      if (register_bit & gpe_register_info->enable_for_run) {
            local_event_status |= ACPI_EVENT_FLAG_ENABLED;
      }

      /* GPE enabled for wake? */

      if (register_bit & gpe_register_info->enable_for_wake) {
            local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
      }

      /* GPE currently active (status bit == 1)? */

      status =
          acpi_hw_low_level_read(8, &in_byte,
                           &gpe_register_info->status_address);
      if (ACPI_FAILURE(status)) {
            goto unlock_and_exit;
      }

      if (register_bit & in_byte) {
            local_event_status |= ACPI_EVENT_FLAG_SET;
      }

      /* Set return value */

      (*event_status) = local_event_status;

      unlock_and_exit:
      return (status);
}
#endif                        /*  ACPI_FUTURE_USAGE  */

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_disable_gpe_block
 *
 * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 *              gpe_block           - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable all GPEs within a single GPE block
 *
 ******************************************************************************/

acpi_status
acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
                    struct acpi_gpe_block_info * gpe_block)
{
      u32 i;
      acpi_status status;

      /* Examine each GPE Register within the block */

      for (i = 0; i < gpe_block->register_count; i++) {

            /* Disable all GPEs in this register */

            status = acpi_hw_low_level_write(8, 0x00,
                                     &gpe_block->register_info[i].
                                     enable_address);
            if (ACPI_FAILURE(status)) {
                  return (status);
            }
      }

      return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_clear_gpe_block
 *
 * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 *              gpe_block           - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 *
 ******************************************************************************/

acpi_status
acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
                  struct acpi_gpe_block_info * gpe_block)
{
      u32 i;
      acpi_status status;

      /* Examine each GPE Register within the block */

      for (i = 0; i < gpe_block->register_count; i++) {

            /* Clear status on all GPEs in this register */

            status = acpi_hw_low_level_write(8, 0xFF,
                                     &gpe_block->register_info[i].
                                     status_address);
            if (ACPI_FAILURE(status)) {
                  return (status);
            }
      }

      return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 *
 * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 *              gpe_block           - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 *              combination wake/run GPEs.
 *
 ******************************************************************************/

acpi_status
acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
                         struct acpi_gpe_block_info * gpe_block)
{
      u32 i;
      acpi_status status;

      /* NOTE: assumes that all GPEs are currently disabled */

      /* Examine each GPE Register within the block */

      for (i = 0; i < gpe_block->register_count; i++) {
            if (!gpe_block->register_info[i].enable_for_run) {
                  continue;
            }

            /* Enable all "runtime" GPEs in this register */

            status =
                acpi_hw_low_level_write(8,
                                  gpe_block->register_info[i].
                                  enable_for_run,
                                  &gpe_block->register_info[i].
                                  enable_address);
            if (ACPI_FAILURE(status)) {
                  return (status);
            }
      }

      return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 *
 * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 *              gpe_block           - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 *              combination wake/run GPEs.
 *
 ******************************************************************************/

static acpi_status
acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
                        struct acpi_gpe_block_info *gpe_block)
{
      u32 i;
      acpi_status status;

      /* Examine each GPE Register within the block */

      for (i = 0; i < gpe_block->register_count; i++) {
            if (!gpe_block->register_info[i].enable_for_wake) {
                  continue;
            }

            /* Enable all "wake" GPEs in this register */

            status = acpi_hw_low_level_write(8,
                                     gpe_block->register_info[i].
                                     enable_for_wake,
                                     &gpe_block->register_info[i].
                                     enable_address);
            if (ACPI_FAILURE(status)) {
                  return (status);
            }
      }

      return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_disable_all_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 *
 ******************************************************************************/

acpi_status acpi_hw_disable_all_gpes(void)
{
      acpi_status status;

      ACPI_FUNCTION_TRACE(hw_disable_all_gpes);

      status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
      status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
      return_ACPI_STATUS(status);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 *
 ******************************************************************************/

acpi_status acpi_hw_enable_all_runtime_gpes(void)
{
      acpi_status status;

      ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);

      status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block);
      return_ACPI_STATUS(status);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 *
 ******************************************************************************/

acpi_status acpi_hw_enable_all_wakeup_gpes(void)
{
      acpi_status status;

      ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);

      status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block);
      return_ACPI_STATUS(status);
}

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