cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/hwacpi.c

/******************************************************************************
 *
 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * 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 "accommon.h"


#define _COMPONENT          ACPI_HARDWARE
ACPI_MODULE_NAME("hwacpi")

#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/******************************************************************************
 *
 * FUNCTION:    acpi_hw_set_mode
 *
 * PARAMETERS:  mode            - SYS_MODE_ACPI or SYS_MODE_LEGACY
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Transitions the system into the requested mode.
 *
 ******************************************************************************/

acpi_status acpi_hw_set_mode(u32 mode) { acpi_status status; ACPI_FUNCTION_TRACE(hw_set_mode); /* If the Hardware Reduced flag is set, machine is always in acpi mode */ if (acpi_gbl_reduced_hardware) { return_ACPI_STATUS(AE_OK); } /* * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, * system does not support mode transition. */ if (!acpi_gbl_FADT.smi_command) { ACPI_ERROR((AE_INFO, "No SMI_CMD in FADT, mode transition failed")); return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); } /* * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE * in FADT: If it is zero, enabling or disabling is not supported. * As old systems may have used zero for mode transition, * we make sure both the numbers are zero to determine these * transitions are not supported. */ if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) { ACPI_ERROR((AE_INFO, "No ACPI mode transition supported in this system " "(enable/disable both zero)")); return_ACPI_STATUS(AE_OK); } switch (mode) { case ACPI_SYS_MODE_ACPI: /* BIOS should have disabled ALL fixed and GP events */ status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, (u32) acpi_gbl_FADT.acpi_enable, 8); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); break; case ACPI_SYS_MODE_LEGACY: /* * BIOS should clear all fixed status bits and restore fixed event * enable bits to default */ status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, (u32)acpi_gbl_FADT.acpi_disable, 8); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Attempting to enable Legacy (non-ACPI) mode\n")); break; default: return_ACPI_STATUS(AE_BAD_PARAMETER); } if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Could not write ACPI mode change")); return_ACPI_STATUS(status); } return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover8042.55%426.67%
Robert Moore3820.21%640.00%
Linus Torvalds (pre-git)3015.96%213.33%
Linus Torvalds2915.43%16.67%
Len Brown115.85%213.33%
Total188100.00%15100.00%

/******************************************************************************* * * FUNCTION: acpi_hw_get_mode * * PARAMETERS: none * * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY * * DESCRIPTION: Return current operating state of system. Determined by * querying the SCI_EN bit. * ******************************************************************************/
u32 acpi_hw_get_mode(void) { acpi_status status; u32 value; ACPI_FUNCTION_TRACE(hw_get_mode); /* If the Hardware Reduced flag is set, machine is always in acpi mode */ if (acpi_gbl_reduced_hardware) { return_UINT32(ACPI_SYS_MODE_ACPI); } /* * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, * system does not support mode transition. */ if (!acpi_gbl_FADT.smi_command) { return_UINT32(ACPI_SYS_MODE_ACPI); } status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value); if (ACPI_FAILURE(status)) { return_UINT32(ACPI_SYS_MODE_LEGACY); } if (value) { return_UINT32(ACPI_SYS_MODE_ACPI); } else { return_UINT32(ACPI_SYS_MODE_LEGACY); } }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover3135.23%218.18%
Robert Moore2022.73%545.45%
Linus Torvalds (pre-git)1517.05%19.09%
Len Brown1314.77%218.18%
Linus Torvalds910.23%19.09%
Total88100.00%11100.00%

#endif /* !ACPI_REDUCED_HARDWARE */

Overall Contributors

PersonTokensPropCommitsCommitProp
Andy Grover11337.17%518.52%
Robert Moore7324.01%1348.15%
Linus Torvalds (pre-git)5317.43%27.41%
Linus Torvalds3912.83%27.41%
Len Brown258.22%414.81%
Patrick Mochel10.33%13.70%
Total304100.00%27100.00%
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