mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 22:53:20 +00:00
8264fce6de
Pull thermal management updates from Zhang Rui: "Sorry that I missed the merge window as there is a bug found in the last minute, and I have to fix it and wait for the code to be tested in linux-next tree for a few days. Now the buggy patch has been dropped entirely from my next branch. Thus I hope those changes can still be merged in 3.18-rc2 as most of them are platform thermal driver changes. Specifics: - introduce ACPI INT340X thermal drivers. Newer laptops and tablets may have thermal sensors and other devices with thermal control capabilities that are exposed for the OS to use via the ACPI INT340x device objects. Several drivers are introduced to expose the temperature information and cooling ability from these objects to user-space via the normal thermal framework. From: Lu Aaron, Lan Tianyu, Jacob Pan and Zhang Rui. - introduce a new thermal governor, which just uses a hysteresis to switch abruptly on/off a cooling device. This governor can be used to control certain fan devices that can not be throttled but just switched on or off. From: Peter Feuerer. - introduce support for some new thermal interrupt functions on i.MX6SX, in IMX thermal driver. From: Anson, Huang. - introduce tracing support on thermal framework. From: Punit Agrawal. - small fixes in OF thermal and thermal step_wise governor" * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (25 commits) Thermal: int340x thermal: select ACPI fan driver Thermal: int3400_thermal: use acpi_thermal_rel parsing APIs Thermal: int340x_thermal: expose acpi thermal relationship tables Thermal: introduce int3403 thermal driver Thermal: introduce INT3402 thermal driver Thermal: move the KELVIN_TO_MILLICELSIUS macro to thermal.h ACPI / Fan: support INT3404 thermal device ACPI / Fan: add ACPI 4.0 style fan support ACPI / fan: convert to platform driver ACPI / fan: use acpi_device_xxx_power instead of acpi_bus equivelant ACPI / fan: remove no need check for device pointer ACPI / fan: remove unused macro Thermal: int3400 thermal: register to thermal framework Thermal: int3400 thermal: add capability to detect supporting UUIDs Thermal: introduce int3400 thermal driver ACPI: add ACPI_TYPE_LOCAL_REFERENCE support to acpi_extract_package() ACPI: make acpi_create_platform_device() an external API thermal: step_wise: fix: Prevent from binary overflow when trend is dropping ACPI: introduce ACPI int340x thermal scan handler thermal: Added Bang-bang thermal governor ...
726 lines
18 KiB
C
726 lines
18 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
|
|
#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"
|
|
|
|
#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 * sizeof(u8));
|
|
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]);
|
|
|
|
if (!element) {
|
|
return AE_BAD_DATA;
|
|
}
|
|
|
|
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 * sizeof(u8);
|
|
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) {
|
|
printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
|
|
(unsigned)buffer.length, package);
|
|
status = AE_BAD_DATA;
|
|
acpi_util_eval_error(handle, pathname, status);
|
|
goto end;
|
|
}
|
|
if (package->type != ACPI_TYPE_PACKAGE) {
|
|
printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
|
|
package->type);
|
|
status = AE_BAD_DATA;
|
|
acpi_util_eval_error(handle, pathname, status);
|
|
goto end;
|
|
}
|
|
if (!package->package.count) {
|
|
printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
|
|
package);
|
|
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;
|
|
printk(KERN_ERR PREFIX
|
|
"Expecting a [Reference] package element, found type %X\n",
|
|
element->type);
|
|
acpi_util_eval_error(handle, pathname, status);
|
|
break;
|
|
}
|
|
|
|
if (!element->reference.handle) {
|
|
printk(KERN_WARNING PREFIX "Invalid reference in"
|
|
" package %s\n", pathname);
|
|
status = AE_NULL_ENTRY;
|
|
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
|
|
* @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, int rev, int 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;
|
|
}
|
|
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, int 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 |= (((u8)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;
|
|
}
|
|
EXPORT_SYMBOL(acpi_check_dsm);
|