cregit-Linux how code gets into the kernel

Release 4.10 drivers/acpi/utils.c

Directory: drivers/acpi
/*
 *  acpi_utils.c - ACPI Utility Functions ($Revision: 10 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/hardirq.h>
#include <linux/acpi.h>
#include <linux/dynamic_debug.h>

#include "internal.h"
#include "sleep.h"


#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("utils");

/* --------------------------------------------------------------------------
                            Object Evaluation Helpers
   -------------------------------------------------------------------------- */

static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) { #ifdef ACPI_DEBUG_OUTPUT char prefix[80] = {'\0'}; struct acpi_buffer buffer = {sizeof(prefix), prefix}; acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n", (char *) prefix, p, acpi_format_exception(s))); #else return; #endif }

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PersonTokensPropCommitsCommitProp
harvey harrisonharvey harrison6583.33%150.00%
andy groverandy grover1316.67%150.00%
Total78100.00%2100.00%


acpi_status acpi_extract_package(union acpi_object *package, struct acpi_buffer *format, struct acpi_buffer *buffer) { u32 size_required = 0; u32 tail_offset = 0; char *format_string = NULL; u32 format_count = 0; u32 i = 0; u8 *head = NULL; u8 *tail = NULL; if (!package || (package->type != ACPI_TYPE_PACKAGE) || (package->package.count < 1)) { printk(KERN_WARNING PREFIX "Invalid package argument\n"); return AE_BAD_PARAMETER; } if (!format || !format->pointer || (format->length < 1)) { printk(KERN_WARNING PREFIX "Invalid format argument\n"); return AE_BAD_PARAMETER; } if (!buffer) { printk(KERN_WARNING PREFIX "Invalid buffer argument\n"); return AE_BAD_PARAMETER; } format_count = (format->length / sizeof(char)) - 1; if (format_count > package->package.count) { printk(KERN_WARNING PREFIX "Format specifies more objects [%d]" " than exist in package [%d].\n", format_count, package->package.count); return AE_BAD_DATA; } format_string = format->pointer; /* * Calculate size_required. */ for (i = 0; i < format_count; i++) { union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': size_required += sizeof(u64); tail_offset += sizeof(u64); break; case 'S': size_required += sizeof(char *) + sizeof(u64) + sizeof(char); tail_offset += sizeof(char *); break; default: printk(KERN_WARNING PREFIX "Invalid package element" " [%d]: got number, expecting" " [%c]\n", i, format_string[i]); return AE_BAD_DATA; break; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': size_required += sizeof(char *) + (element->string.length * sizeof(char)) + sizeof(char); tail_offset += sizeof(char *); break; case 'B': size_required += sizeof(u8 *) + element->buffer.length; tail_offset += sizeof(u8 *); break; default: printk(KERN_WARNING PREFIX "Invalid package element" " [%d] got string/buffer," " expecting [%c]\n", i, format_string[i]); return AE_BAD_DATA; break; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': size_required += sizeof(void *); tail_offset += sizeof(void *); break; default: printk(KERN_WARNING PREFIX "Invalid package element" " [%d] got reference," " expecting [%c]\n", i, format_string[i]); return AE_BAD_DATA; break; } break; case ACPI_TYPE_PACKAGE: default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unsupported element at index=%d\n", i)); /* TBD: handle nested packages... */ return AE_SUPPORT; break; } } /* * Validate output buffer. */ if (buffer->length == ACPI_ALLOCATE_BUFFER) { buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); if (!buffer->pointer) return AE_NO_MEMORY; buffer->length = size_required; } else { if (buffer->length < size_required) { buffer->length = size_required; return AE_BUFFER_OVERFLOW; } else if (buffer->length != size_required || !buffer->pointer) { return AE_BAD_PARAMETER; } } head = buffer->pointer; tail = buffer->pointer + tail_offset; /* * Extract package data. */ for (i = 0; i < format_count; i++) { u8 **pointer = NULL; union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': *((u64 *) head) = element->integer.value; head += sizeof(u64); break; case 'S': pointer = (u8 **) head; *pointer = tail; *((u64 *) tail) = element->integer.value; head += sizeof(u64 *); tail += sizeof(u64); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->string.pointer, element->string.length); head += sizeof(char *); tail += element->string.length * sizeof(char); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; case 'B': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->buffer.pointer, element->buffer.length); head += sizeof(u8 *); tail += element->buffer.length; break; default: /* Should never get here */ break; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': *(void **)head = (void *)element->reference.handle; head += sizeof(void *); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_PACKAGE: /* TBD: handle nested packages... */ default: /* Should never get here */ break; } } return AE_OK; }

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PersonTokensPropCommitsCommitProp
andy groverandy grover71478.20%220.00%
rui zhangrui zhang9210.08%110.00%
al stoneal stone374.05%110.00%
len brownlen brown353.83%110.00%
patrick mochelpatrick mochel202.19%110.00%
lin minglin ming80.88%110.00%
thomas renningerthomas renninger40.44%110.00%
colin kingcolin king20.22%110.00%
jonghwan choijonghwan choi10.11%110.00%
Total913100.00%10100.00%

EXPORT_SYMBOL(acpi_extract_package);
acpi_status acpi_evaluate_integer(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, unsigned long long *data) { acpi_status status = AE_OK; union acpi_object element; struct acpi_buffer buffer = { 0, NULL }; if (!data) return AE_BAD_PARAMETER; buffer.length = sizeof(union acpi_object); buffer.pointer = &element; status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) { acpi_util_eval_error(handle, pathname, status); return status; } if (element.type != ACPI_TYPE_INTEGER) { acpi_util_eval_error(handle, pathname, AE_BAD_DATA); return AE_BAD_DATA; } *data = element.integer.value; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data)); return AE_OK; }

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PersonTokensPropCommitsCommitProp
andy groverandy grover11678.91%233.33%
len brownlen brown1812.24%116.67%
patrick mochelpatrick mochel85.44%116.67%
pavel machekpavel machek32.04%116.67%
matthew wilcoxmatthew wilcox21.36%116.67%
Total147100.00%6100.00%

EXPORT_SYMBOL(acpi_evaluate_integer);
acpi_status acpi_evaluate_reference(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, struct acpi_handle_list *list) { acpi_status status = AE_OK; union acpi_object *package = NULL; union acpi_object *element = NULL; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; u32 i = 0; if (!list) { return AE_BAD_PARAMETER; } /* Evaluate object. */ status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) goto end; package = buffer.pointer; if ((buffer.length == 0) || !package) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->type != ACPI_TYPE_PACKAGE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (!package->package.count) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->package.count > ACPI_MAX_HANDLES) { return AE_NO_MEMORY; } list->count = package->package.count; /* Extract package data. */ for (i = 0; i < list->count; i++) { element = &(package->package.elements[i]); if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); break; } if (!element->reference.handle) { status = AE_NULL_ENTRY; acpi_util_eval_error(handle, pathname, status); break; } /* Get the acpi_handle. */ list->handles[i] = element->reference.handle; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n", list->handles[i])); } end: if (ACPI_FAILURE(status)) { list->count = 0; //kfree(list->handles); } kfree(buffer.pointer); return status; }

Contributors

PersonTokensPropCommitsCommitProp
andy groverandy grover31190.41%444.44%
thomas renningerthomas renninger164.65%111.11%
rafael j. wysockirafael j. wysocki92.62%111.11%
patrick mochelpatrick mochel61.74%111.11%
len brownlen brown10.29%111.11%
robert moorerobert moore10.29%111.11%
Total344100.00%9100.00%

EXPORT_SYMBOL(acpi_evaluate_reference);
acpi_status acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) { acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *output; status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); if (ACPI_FAILURE(status)) return status; output = buffer.pointer; if (!output || output->type != ACPI_TYPE_PACKAGE || !output->package.count || output->package.elements[0].type != ACPI_TYPE_BUFFER || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { status = AE_TYPE; goto out; } status = acpi_decode_pld_buffer( output->package.elements[0].buffer.pointer, output->package.elements[0].buffer.length, pld); out: kfree(buffer.pointer); return status; }

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matthew garrettmatthew garrett15394.44%150.00%
feng tangfeng tang95.56%150.00%
Total162100.00%2100.00%

EXPORT_SYMBOL(acpi_get_physical_device_location); /** * acpi_evaluate_ost: Evaluate _OST for hotplug operations * @handle: ACPI device handle * @source_event: source event code * @status_code: status code * @status_buf: optional detailed information (NULL if none) * * Evaluate _OST for hotplug operations. All ACPI hotplug handlers * must call this function when evaluating _OST for hotplug operations. * When the platform does not support _OST, this function has no effect. */
acpi_status acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, struct acpi_buffer *status_buf) { union acpi_object params[3] = { {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_BUFFER,} }; struct acpi_object_list arg_list = {3, params}; params[0].integer.value = source_event; params[1].integer.value = status_code; if (status_buf != NULL) { params[2].buffer.pointer = status_buf->pointer; params[2].buffer.length = status_buf->length; } else { params[2].buffer.pointer = NULL; params[2].buffer.length = 0; } return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); }

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toshi kanitoshi kani15198.69%150.00%
jiang liujiang liu21.31%150.00%
Total153100.00%2100.00%

EXPORT_SYMBOL(acpi_evaluate_ost); /** * acpi_handle_path: Return the object path of handle * * Caller must free the returned buffer */
static char *acpi_handle_path(acpi_handle handle) { struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER, .pointer = NULL }; if (in_interrupt() || acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) return NULL; return buffer.pointer; }

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bjorn morkbjorn mork51100.00%1100.00%
Total51100.00%1100.00%

/** * acpi_handle_printk: Print message with ACPI prefix and object path * * This function is called through acpi_handle_<level> macros and prints * a message with ACPI prefix and object path. This function acquires * the global namespace mutex to obtain an object path. In interrupt * context, it shows the object path as <n/a>. */
void acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...) { struct va_format vaf; va_list args; const char *path; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; path = acpi_handle_path(handle); printk("%sACPI: %s: %pV", level, path ? path : "<n/a>" , &vaf); va_end(args); kfree(path); }

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toshi kanitoshi kani5969.41%150.00%
bjorn morkbjorn mork2630.59%150.00%
Total85100.00%2100.00%

EXPORT_SYMBOL(acpi_handle_printk); #if defined(CONFIG_DYNAMIC_DEBUG) /** * __acpi_handle_debug: pr_debug with ACPI prefix and object path * * This function is called through acpi_handle_debug macro and debug * prints a message with ACPI prefix and object path. This function * acquires the global namespace mutex to obtain an object path. In * interrupt context, it shows the object path as <n/a>. */
void __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, const char *fmt, ...) { struct va_format vaf; va_list args; const char *path; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; path = acpi_handle_path(handle); __dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf); va_end(args); kfree(path); }

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bjorn morkbjorn mork6272.94%150.00%
toshi kanitoshi kani2327.06%150.00%
Total85100.00%2100.00%

EXPORT_SYMBOL(__acpi_handle_debug); #endif /** * acpi_has_method: Check whether @handle has a method named @name * @handle: ACPI device handle * @name: name of object or method * * Check whether @handle has a method named @name. */
bool acpi_has_method(acpi_handle handle, char *name) { acpi_handle tmp; return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp)); }

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jiang liujiang liu29100.00%1100.00%
Total29100.00%1100.00%

EXPORT_SYMBOL(acpi_has_method);
acpi_status acpi_execute_simple_method(acpi_handle handle, char *method, u64 arg) { union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, }; obj.integer.value = arg; return acpi_evaluate_object(handle, method, &arg_list, NULL); }

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jiang liujiang liu64100.00%1100.00%
Total64100.00%1100.00%

EXPORT_SYMBOL(acpi_execute_simple_method); /** * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations * @handle: ACPI device handle * * Evaluate device's _EJ0 method for hotplug operations. */
acpi_status acpi_evaluate_ej0(acpi_handle handle) { acpi_status status; status = acpi_execute_simple_method(handle, "_EJ0", 1); if (status == AE_NOT_FOUND) acpi_handle_warn(handle, "No _EJ0 support for device\n"); else if (ACPI_FAILURE(status)) acpi_handle_warn(handle, "Eject failed (0x%x)\n", status); return status; }

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PersonTokensPropCommitsCommitProp
jiang liujiang liu55100.00%1100.00%
Total55100.00%1100.00%

/** * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device * @handle: ACPI device handle * @lock: lock device if non-zero, otherwise unlock device * * Evaluate device's _LCK method if present to lock/unlock device */
acpi_status acpi_evaluate_lck(acpi_handle handle, int lock) { acpi_status status; status = acpi_execute_simple_method(handle, "_LCK", !!lock); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { if (lock) acpi_handle_warn(handle, "Locking device failed (0x%x)\n", status); else acpi_handle_warn(handle, "Unlocking device failed (0x%x)\n", status); } return status; }

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PersonTokensPropCommitsCommitProp
jiang liujiang liu66100.00%1100.00%
Total66100.00%1100.00%

/** * acpi_evaluate_dsm - evaluate device's _DSM method * @handle: ACPI device handle * @uuid: UUID of requested functions, should be 16 bytes * @rev: revision number of requested function * @func: requested function number * @argv4: the function specific parameter * * Evaluate device's _DSM method with specified UUID, revision id and * function number. Caller needs to free the returned object. * * Though ACPI defines the fourth parameter for _DSM should be a package, * some old BIOSes do expect a buffer or an integer etc. */
union acpi_object * acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 func, union acpi_object *argv4) { acpi_status ret; struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; union acpi_object params[4]; struct acpi_object_list input = { .count = 4, .pointer = params, }; params[0].type = ACPI_TYPE_BUFFER; params[0].buffer.length = 16; params[0].buffer.pointer = (char *)uuid; params[1].type = ACPI_TYPE_INTEGER; params[1].integer.value = rev; params[2].type = ACPI_TYPE_INTEGER; params[2].integer.value = func; if (argv4) { params[3] = *argv4; } else { params[3].type = ACPI_TYPE_PACKAGE; params[3].package.count = 0; params[3].package.elements = NULL; } ret = acpi_evaluate_object(handle, "_DSM", &input, &buf); if (ACPI_SUCCESS(ret)) return (union acpi_object *)buf.pointer; if (ret != AE_NOT_FOUND) acpi_handle_warn(handle, "failed to evaluate _DSM (0x%x)\n", ret); return NULL; }

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jiang liujiang liu23399.15%150.00%
jerry hoemannjerry hoemann20.85%150.00%
Total235100.00%2100.00%

EXPORT_SYMBOL(acpi_evaluate_dsm); /** * acpi_check_dsm - check if _DSM method supports requested functions. * @handle: ACPI device handle * @uuid: UUID of requested functions, should be 16 bytes at least * @rev: revision number of requested functions * @funcs: bitmap of requested functions * * Evaluate device's _DSM method to check whether it supports requested * functions. Currently only support 64 functions at maximum, should be * enough for now. */
bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs) { int i; u64 mask = 0; union acpi_object *obj; if (funcs == 0) return false; obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL); if (!obj) return false; /* For compatibility, old BIOSes may return an integer */ if (obj->type == ACPI_TYPE_INTEGER) mask = obj->integer.value; else if (obj->type == ACPI_TYPE_BUFFER) for (i = 0; i < obj->buffer.length && i < 8; i++) mask |= (((u64)obj->buffer.pointer[i]) << (i * 8)); ACPI_FREE(obj); /* * Bit 0 indicates whether there's support for any functions other than * function 0 for the specified UUID and revision. */ if ((mask & 0x1) && (mask & funcs) == funcs) return true; return false; }

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PersonTokensPropCommitsCommitProp
jiang liujiang liu15293.25%125.00%
dan williamsdan williams95.52%125.00%
colin kingcolin king10.61%125.00%
jerry hoemannjerry hoemann10.61%125.00%
Total163100.00%4100.00%

EXPORT_SYMBOL(acpi_check_dsm); /** * acpi_dev_found - Detect presence of a given ACPI device in the namespace. * @hid: Hardware ID of the device. * * Return %true if the device was present at the moment of invocation. * Note that if the device is pluggable, it may since have disappeared. * * For this function to work, acpi_bus_scan() must have been executed * which happens in the subsys_initcall() subsection. Hence, do not * call from a subsys_initcall() or earlier (use acpi_get_devices() * instead). Calling from module_init() is fine (which is synonymous * with device_initcall()). */
bool acpi_dev_found(const char *hid) { struct acpi_device_bus_id *acpi_device_bus_id; bool found = false; mutex_lock(&acpi_device_lock); list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) if (!strcmp(acpi_device_bus_id->bus_id, hid)) { found = true; break; } mutex_unlock(&acpi_device_lock); return found; }

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lukas wunnerlukas wunner62100.00%2100.00%
Total62100.00%2100.00%

EXPORT_SYMBOL(acpi_dev_found); /* * acpi_backlight= handling, this is done here rather then in video_detect.c * because __setup cannot be used in modules. */ char acpi_video_backlight_string[16]; EXPORT_SYMBOL(acpi_video_backlight_string);
static int __init acpi_backlight(char *str) { strlcpy(acpi_video_backlight_string, str, sizeof(acpi_video_backlight_string)); return 1; }

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hans de goedehans de goede26100.00%1100.00%
Total26100.00%1100.00%

__setup("acpi_backlight=", acpi_backlight);

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PersonTokensPropCommitsCommitProp
andy groverandy grover117641.18%49.30%
jiang liujiang liu62621.92%511.63%
toshi kanitoshi kani2488.68%24.65%
matthew garrettmatthew garrett1585.53%12.33%
bjorn morkbjorn mork1585.53%12.33%
rui zhangrui zhang923.22%12.33%
len brownlen brown722.52%613.95%
lukas wunnerlukas wunner712.49%24.65%
harvey harrisonharvey harrison652.28%12.33%
hans de goedehans de goede451.58%12.33%
al stoneal stone371.30%12.33%
patrick mochelpatrick mochel341.19%12.33%
thomas renningerthomas renninger200.70%24.65%
rafael j. wysockirafael j. wysocki100.35%24.65%
feng tangfeng tang90.32%12.33%
dan williamsdan williams90.32%12.33%
lin minglin ming80.28%12.33%
tejun heotejun heo30.11%12.33%
colin kingcolin king30.11%24.65%
pavel machekpavel machek30.11%12.33%
jerry hoemannjerry hoemann30.11%12.33%
matthew wilcoxmatthew wilcox20.07%12.33%
jarkko nikulajarkko nikula10.04%12.33%
jonghwan choijonghwan choi10.04%12.33%
robert moorerobert moore10.04%12.33%
wang yijingwang yijing10.04%12.33%
Total2856100.00%43100.00%
Directory: drivers/acpi
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