linux/drivers/acpi/utils.c
Andy Shevchenko 67dcf8a3e0 ACPI: utils: Introduce acpi_dev_get_first_match_name()
Sometimes the user wants to have device name of the match rather than
just checking if device present or not. To make life easier for such
users introduce acpi_dev_get_first_match_name() helper based on code
for acpi_dev_present().

For example, GPIO driver for Intel Merrifield needs to know the device
name of pin control to be able to apply GPIO mapping table to the proper
device.

To be more consistent with the purpose rename

  struct acpi_dev_present_info  -> struct acpi_dev_match_info
  acpi_dev_present_cb()         -> acpi_dev_match_cb()

in the utils.c file.

Tested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-01-10 00:41:43 +01:00

883 lines
23 KiB
C

/*
* 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
}
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;
}
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;
}
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) {
kfree(package);
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;
}
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;
}
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);
}
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;
}
/**
* 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);
}
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);
}
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));
}
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);
}
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;
}
/**
* 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;
}
/**
* acpi_evaluate_dsm - evaluate device's _DSM method
* @handle: ACPI device handle
* @guid: GUID 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 GUID, 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 guid_t *guid, 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 = (u8 *)guid;
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;
}
EXPORT_SYMBOL(acpi_evaluate_dsm);
/**
* acpi_check_dsm - check if _DSM method supports requested functions.
* @handle: ACPI device handle
* @guid: GUID 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 guid_t *guid, u64 rev, u64 funcs)
{
int i;
u64 mask = 0;
union acpi_object *obj;
if (funcs == 0)
return false;
obj = acpi_evaluate_dsm(handle, guid, 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 GUID and revision.
*/
if ((mask & 0x1) && (mask & funcs) == funcs)
return true;
return false;
}
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;
}
EXPORT_SYMBOL(acpi_dev_found);
struct acpi_dev_match_info {
const char *dev_name;
struct acpi_device_id hid[2];
const char *uid;
s64 hrv;
};
static int acpi_dev_match_cb(struct device *dev, void *data)
{
struct acpi_device *adev = to_acpi_device(dev);
struct acpi_dev_match_info *match = data;
unsigned long long hrv;
acpi_status status;
if (acpi_match_device_ids(adev, match->hid))
return 0;
if (match->uid && (!adev->pnp.unique_id ||
strcmp(adev->pnp.unique_id, match->uid)))
return 0;
match->dev_name = acpi_dev_name(adev);
if (match->hrv == -1)
return 1;
status = acpi_evaluate_integer(adev->handle, "_HRV", NULL, &hrv);
if (ACPI_FAILURE(status))
return 0;
return hrv == match->hrv;
}
/**
* acpi_dev_present - Detect that a given ACPI device is present
* @hid: Hardware ID of the device.
* @uid: Unique ID of the device, pass NULL to not check _UID
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
*
* Return %true if a matching device was present at the moment of invocation.
* Note that if the device is pluggable, it may since have disappeared.
*
* Note that unlike acpi_dev_found() this function checks the status
* of the device. So for devices which are present in the dsdt, but
* which are disabled (their _STA callback returns 0) this function
* will return false.
*
* 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_present(const char *hid, const char *uid, s64 hrv)
{
struct acpi_dev_match_info match = {};
struct device *dev;
strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
match.uid = uid;
match.hrv = hrv;
dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb);
return !!dev;
}
EXPORT_SYMBOL(acpi_dev_present);
/**
* acpi_dev_get_first_match_name - Return name of first match of ACPI device
* @hid: Hardware ID of the device.
* @uid: Unique ID of the device, pass NULL to not check _UID
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
*
* Return device name if a matching device was present
* at the moment of invocation, or NULL otherwise.
*
* See additional information in acpi_dev_present() as well.
*/
const char *
acpi_dev_get_first_match_name(const char *hid, const char *uid, s64 hrv)
{
struct acpi_dev_match_info match = {};
struct device *dev;
strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
match.uid = uid;
match.hrv = hrv;
dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb);
return dev ? match.dev_name : NULL;
}
EXPORT_SYMBOL(acpi_dev_get_first_match_name);
/*
* 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;
}
__setup("acpi_backlight=", acpi_backlight);
/**
* acpi_match_platform_list - Check if the system matches with a given list
* @plat: pointer to acpi_platform_list table terminated by a NULL entry
*
* Return the matched index if the system is found in the platform list.
* Otherwise, return a negative error code.
*/
int acpi_match_platform_list(const struct acpi_platform_list *plat)
{
struct acpi_table_header hdr;
int idx = 0;
if (acpi_disabled)
return -ENODEV;
for (; plat->oem_id[0]; plat++, idx++) {
if (ACPI_FAILURE(acpi_get_table_header(plat->table, 0, &hdr)))
continue;
if (strncmp(plat->oem_id, hdr.oem_id, ACPI_OEM_ID_SIZE))
continue;
if (strncmp(plat->oem_table_id, hdr.oem_table_id, ACPI_OEM_TABLE_ID_SIZE))
continue;
if ((plat->pred == all_versions) ||
(plat->pred == less_than_or_equal && hdr.oem_revision <= plat->oem_revision) ||
(plat->pred == greater_than_or_equal && hdr.oem_revision >= plat->oem_revision) ||
(plat->pred == equal && hdr.oem_revision == plat->oem_revision))
return idx;
}
return -ENODEV;
}
EXPORT_SYMBOL(acpi_match_platform_list);