| /* |
| * 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 *adev; |
| 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); |
| match->adev = 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); |
| put_device(dev); |
| return !!dev; |
| } |
| EXPORT_SYMBOL(acpi_dev_present); |
| |
| /** |
| * acpi_dev_get_first_match_dev - Return the 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 the first match of ACPI device if a matching device was present |
| * at the moment of invocation, or NULL otherwise. |
| * |
| * The caller is responsible to call put_device() on the returned device. |
| * |
| * See additional information in acpi_dev_present() as well. |
| */ |
| struct acpi_device * |
| acpi_dev_get_first_match_dev(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.adev : NULL; |
| } |
| EXPORT_SYMBOL(acpi_dev_get_first_match_dev); |
| |
| /* |
| * 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); |