cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/uteval.c

/******************************************************************************
 *
 * Module Name: uteval - Object evaluation
 *
 *****************************************************************************/

/*
 * 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"
#include "acnamesp.h"


#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("uteval")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_evaluate_object
 *
 * PARAMETERS:  prefix_node         - Starting node
 *              path                - Path to object from starting node
 *              expected_return_types - Bitmap of allowed return types
 *              return_desc         - Where a return value is stored
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluates a namespace object and verifies the type of the
 *              return object. Common code that simplifies accessing objects
 *              that have required return objects of fixed types.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/


acpi_status acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node, const char *path, u32 expected_return_btypes, union acpi_operand_object **return_desc) { struct acpi_evaluate_info *info; acpi_status status; u32 return_btype; ACPI_FUNCTION_TRACE(ut_evaluate_object); /* Allocate the evaluation information block */ info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); if (!info) { return_ACPI_STATUS(AE_NO_MEMORY); } info->prefix_node = prefix_node; info->relative_pathname = path; /* Evaluate the object/method */ status = acpi_ns_evaluate(info); if (ACPI_FAILURE(status)) { if (status == AE_NOT_FOUND) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s.%s] was not found\n", acpi_ut_get_node_name(prefix_node), path)); } else { ACPI_ERROR_METHOD("Method execution failed", prefix_node, path, status); } goto cleanup; } /* Did we get a return object? */ if (!info->return_object) { if (expected_return_btypes) { ACPI_ERROR_METHOD("No object was returned from", prefix_node, path, AE_NOT_EXIST); status = AE_NOT_EXIST; } goto cleanup; } /* Map the return object type to the bitmapped type */ switch ((info->return_object)->common.type) { case ACPI_TYPE_INTEGER: return_btype = ACPI_BTYPE_INTEGER; break; case ACPI_TYPE_BUFFER: return_btype = ACPI_BTYPE_BUFFER; break; case ACPI_TYPE_STRING: return_btype = ACPI_BTYPE_STRING; break; case ACPI_TYPE_PACKAGE: return_btype = ACPI_BTYPE_PACKAGE; break; default: return_btype = 0; break; } if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) { /* * We received a return object, but one was not expected. This can * happen frequently if the "implicit return" feature is enabled. * Just delete the return object and return AE_OK. */ acpi_ut_remove_reference(info->return_object); goto cleanup; } /* Is the return object one of the expected types? */ if (!(expected_return_btypes & return_btype)) { ACPI_ERROR_METHOD("Return object type is incorrect", prefix_node, path, AE_TYPE); ACPI_ERROR((AE_INFO, "Type returned from %s was incorrect: %s, expected Btypes: 0x%X", path, acpi_ut_get_object_type_name(info->return_object), expected_return_btypes)); /* On error exit, we must delete the return object */ acpi_ut_remove_reference(info->return_object); status = AE_TYPE; goto cleanup; } /* Object type is OK, return it */ *return_desc = info->return_object; cleanup: ACPI_FREE(info); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover11635.91%628.57%
Robert Moore7824.15%838.10%
Len Brown4513.93%419.05%
Linus Torvalds (pre-git)4313.31%14.76%
Linus Torvalds4112.69%29.52%
Total323100.00%21100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_evaluate_numeric_object * * PARAMETERS: object_name - Object name to be evaluated * device_node - Node for the device * value - Where the value is returned * * RETURN: Status * * DESCRIPTION: Evaluates a numeric namespace object for a selected device * and stores result in *Value. * * NOTE: Internal function, no parameter validation * ******************************************************************************/
acpi_status acpi_ut_evaluate_numeric_object(const char *object_name, struct acpi_namespace_node *device_node, u64 *value) { union acpi_operand_object *obj_desc; acpi_status status; ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object); status = acpi_ut_evaluate_object(device_node, object_name, ACPI_BTYPE_INTEGER, &obj_desc); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Get the returned Integer */ *value = obj_desc->integer.value; /* On exit, we must delete the return object */ acpi_ut_remove_reference(obj_desc); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3239.51%216.67%
Andy Grover2429.63%541.67%
Linus Torvalds2024.69%18.33%
Robert Moore56.17%433.33%
Total81100.00%12100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_execute_STA * * PARAMETERS: device_node - Node for the device * flags - Where the status flags are returned * * RETURN: Status * * DESCRIPTION: Executes _STA for selected device and stores results in * *Flags. If _STA does not exist, then the device is assumed * to be present/functional/enabled (as per the ACPI spec). * * NOTE: Internal function, no parameter validation * ******************************************************************************/
acpi_status acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags) { union acpi_operand_object *obj_desc; acpi_status status; ACPI_FUNCTION_TRACE(ut_execute_STA); status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA, ACPI_BTYPE_INTEGER, &obj_desc); if (ACPI_FAILURE(status)) { if (AE_NOT_FOUND == status) { /* * if _STA does not exist, then (as per the ACPI specification), * the returned flags will indicate that the device is present, * functional, and enabled. */ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "_STA on %4.4s was not found, assuming device is present\n", acpi_ut_get_node_name(device_node))); *flags = ACPI_UINT32_MAX; status = AE_OK; } return_ACPI_STATUS(status); } /* Extract the status flags */ *flags = (u32) obj_desc->integer.value; /* On exit, we must delete the return object */ acpi_ut_remove_reference(obj_desc); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover4641.44%444.44%
Robert Moore3632.43%222.22%
Linus Torvalds (pre-git)1917.12%222.22%
Linus Torvalds109.01%111.11%
Total111100.00%9100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_execute_power_methods * * PARAMETERS: device_node - Node for the device * method_names - Array of power method names * method_count - Number of methods to execute * out_values - Where the power method values are returned * * RETURN: Status, out_values * * DESCRIPTION: Executes the specified power methods for the device and returns * the result(s). * * NOTE: Internal function, no parameter validation * ******************************************************************************/
acpi_status acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node, const char **method_names, u8 method_count, u8 *out_values) { union acpi_operand_object *obj_desc; acpi_status status; acpi_status final_status = AE_NOT_FOUND; u32 i; ACPI_FUNCTION_TRACE(ut_execute_power_methods); for (i = 0; i < method_count; i++) { /* * Execute the power method (_sx_d or _sx_w). The only allowable * return type is an Integer. */ status = acpi_ut_evaluate_object(device_node, ACPI_CAST_PTR(char, method_names[i]), ACPI_BTYPE_INTEGER, &obj_desc); if (ACPI_SUCCESS(status)) { out_values[i] = (u8)obj_desc->integer.value; /* Delete the return object */ acpi_ut_remove_reference(obj_desc); final_status = AE_OK; /* At least one value is valid */ continue; } out_values[i] = ACPI_UINT8_MAX; if (status == AE_NOT_FOUND) { continue; /* Ignore if not found */ } ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Failed %s on Device %4.4s, %s\n", ACPI_CAST_PTR(char, method_names[i]), acpi_ut_get_node_name(device_node), acpi_format_exception(status))); } return_ACPI_STATUS(final_status); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore6337.50%323.08%
Andy Grover4929.17%430.77%
Len Brown4023.81%17.69%
Linus Torvalds (pre-git)127.14%215.38%
Linus Torvalds42.38%323.08%
Total168100.00%13100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Andy Grover23733.57%924.32%
Robert Moore18926.77%1540.54%
Linus Torvalds (pre-git)11516.29%38.11%
Len Brown8712.32%616.22%
Linus Torvalds7710.91%38.11%
Patrick Mochel10.14%12.70%
Total706100.00%37100.00%
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