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1351 lines
35 KiB
1351 lines
35 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) |
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* |
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) "ACPI: " fmt |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/ioport.h> |
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#include <linux/kernel.h> |
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#include <linux/list.h> |
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#include <linux/sched.h> |
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#include <linux/pm.h> |
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#include <linux/device.h> |
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#include <linux/proc_fs.h> |
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#include <linux/acpi.h> |
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#include <linux/slab.h> |
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#include <linux/regulator/machine.h> |
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#include <linux/workqueue.h> |
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#include <linux/reboot.h> |
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#include <linux/delay.h> |
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#ifdef CONFIG_X86 |
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#include <asm/mpspec.h> |
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#include <linux/dmi.h> |
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#endif |
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#include <linux/acpi_iort.h> |
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#include <linux/pci.h> |
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#include <acpi/apei.h> |
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#include <linux/suspend.h> |
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|
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#include "internal.h" |
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|
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struct acpi_device *acpi_root; |
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struct proc_dir_entry *acpi_root_dir; |
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EXPORT_SYMBOL(acpi_root_dir); |
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|
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#ifdef CONFIG_X86 |
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#ifdef CONFIG_ACPI_CUSTOM_DSDT |
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static inline int set_copy_dsdt(const struct dmi_system_id *id) |
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{ |
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return 0; |
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} |
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#else |
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static int set_copy_dsdt(const struct dmi_system_id *id) |
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{ |
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pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident); |
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acpi_gbl_copy_dsdt_locally = 1; |
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return 0; |
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} |
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#endif |
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|
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static const struct dmi_system_id dsdt_dmi_table[] __initconst = { |
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/* |
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* Invoke DSDT corruption work-around on all Toshiba Satellite. |
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* https://bugzilla.kernel.org/show_bug.cgi?id=14679 |
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*/ |
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{ |
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.callback = set_copy_dsdt, |
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.ident = "TOSHIBA Satellite", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), |
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}, |
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}, |
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{} |
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}; |
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#endif |
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|
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/* -------------------------------------------------------------------------- |
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Device Management |
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-------------------------------------------------------------------------- */ |
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|
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acpi_status acpi_bus_get_status_handle(acpi_handle handle, |
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unsigned long long *sta) |
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{ |
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acpi_status status; |
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|
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status = acpi_evaluate_integer(handle, "_STA", NULL, sta); |
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if (ACPI_SUCCESS(status)) |
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return AE_OK; |
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|
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if (status == AE_NOT_FOUND) { |
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*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | |
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ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; |
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return AE_OK; |
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} |
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return status; |
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} |
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EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); |
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|
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int acpi_bus_get_status(struct acpi_device *device) |
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{ |
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acpi_status status; |
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unsigned long long sta; |
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|
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if (acpi_device_always_present(device)) { |
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acpi_set_device_status(device, ACPI_STA_DEFAULT); |
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return 0; |
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} |
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|
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/* Battery devices must have their deps met before calling _STA */ |
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if (acpi_device_is_battery(device) && device->dep_unmet) { |
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acpi_set_device_status(device, 0); |
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return 0; |
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} |
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|
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status = acpi_bus_get_status_handle(device->handle, &sta); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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|
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acpi_set_device_status(device, sta); |
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|
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if (device->status.functional && !device->status.present) { |
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pr_debug("Device [%s] status [%08x]: functional but not present\n", |
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device->pnp.bus_id, (u32)sta); |
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} |
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|
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pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta); |
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return 0; |
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} |
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EXPORT_SYMBOL(acpi_bus_get_status); |
|
|
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void acpi_bus_private_data_handler(acpi_handle handle, |
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void *context) |
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{ |
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return; |
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} |
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EXPORT_SYMBOL(acpi_bus_private_data_handler); |
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|
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int acpi_bus_attach_private_data(acpi_handle handle, void *data) |
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{ |
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acpi_status status; |
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|
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status = acpi_attach_data(handle, |
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acpi_bus_private_data_handler, data); |
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if (ACPI_FAILURE(status)) { |
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acpi_handle_debug(handle, "Error attaching device data\n"); |
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return -ENODEV; |
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} |
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|
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); |
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|
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int acpi_bus_get_private_data(acpi_handle handle, void **data) |
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{ |
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acpi_status status; |
|
|
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if (!data) |
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return -EINVAL; |
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|
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status = acpi_get_data(handle, acpi_bus_private_data_handler, data); |
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if (ACPI_FAILURE(status)) { |
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acpi_handle_debug(handle, "No context for object\n"); |
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return -ENODEV; |
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} |
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|
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); |
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|
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void acpi_bus_detach_private_data(acpi_handle handle) |
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{ |
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acpi_detach_data(handle, acpi_bus_private_data_handler); |
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} |
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EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); |
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|
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static void acpi_print_osc_error(acpi_handle handle, |
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struct acpi_osc_context *context, char *error) |
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{ |
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int i; |
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|
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acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); |
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|
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pr_debug("_OSC request data:"); |
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for (i = 0; i < context->cap.length; i += sizeof(u32)) |
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pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); |
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|
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pr_debug("\n"); |
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} |
|
|
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acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) |
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{ |
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acpi_status status; |
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struct acpi_object_list input; |
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union acpi_object in_params[4]; |
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union acpi_object *out_obj; |
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guid_t guid; |
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u32 errors; |
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struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
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|
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if (!context) |
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return AE_ERROR; |
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if (guid_parse(context->uuid_str, &guid)) |
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return AE_ERROR; |
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context->ret.length = ACPI_ALLOCATE_BUFFER; |
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context->ret.pointer = NULL; |
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|
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/* Setting up input parameters */ |
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input.count = 4; |
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input.pointer = in_params; |
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in_params[0].type = ACPI_TYPE_BUFFER; |
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in_params[0].buffer.length = 16; |
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in_params[0].buffer.pointer = (u8 *)&guid; |
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in_params[1].type = ACPI_TYPE_INTEGER; |
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in_params[1].integer.value = context->rev; |
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in_params[2].type = ACPI_TYPE_INTEGER; |
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in_params[2].integer.value = context->cap.length/sizeof(u32); |
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in_params[3].type = ACPI_TYPE_BUFFER; |
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in_params[3].buffer.length = context->cap.length; |
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in_params[3].buffer.pointer = context->cap.pointer; |
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|
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status = acpi_evaluate_object(handle, "_OSC", &input, &output); |
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if (ACPI_FAILURE(status)) |
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return status; |
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|
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if (!output.length) |
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return AE_NULL_OBJECT; |
|
|
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out_obj = output.pointer; |
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if (out_obj->type != ACPI_TYPE_BUFFER |
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|| out_obj->buffer.length != context->cap.length) { |
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acpi_print_osc_error(handle, context, |
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"_OSC evaluation returned wrong type"); |
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status = AE_TYPE; |
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goto out_kfree; |
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} |
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/* Need to ignore the bit0 in result code */ |
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errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); |
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if (errors) { |
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if (errors & OSC_REQUEST_ERROR) |
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acpi_print_osc_error(handle, context, |
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"_OSC request failed"); |
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if (errors & OSC_INVALID_UUID_ERROR) |
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acpi_print_osc_error(handle, context, |
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"_OSC invalid UUID"); |
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if (errors & OSC_INVALID_REVISION_ERROR) |
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acpi_print_osc_error(handle, context, |
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"_OSC invalid revision"); |
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if (errors & OSC_CAPABILITIES_MASK_ERROR) { |
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if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] |
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& OSC_QUERY_ENABLE) |
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goto out_success; |
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status = AE_SUPPORT; |
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goto out_kfree; |
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} |
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status = AE_ERROR; |
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goto out_kfree; |
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} |
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out_success: |
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context->ret.length = out_obj->buffer.length; |
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context->ret.pointer = kmemdup(out_obj->buffer.pointer, |
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context->ret.length, GFP_KERNEL); |
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if (!context->ret.pointer) { |
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status = AE_NO_MEMORY; |
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goto out_kfree; |
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} |
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status = AE_OK; |
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|
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out_kfree: |
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kfree(output.pointer); |
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if (status != AE_OK) |
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context->ret.pointer = NULL; |
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return status; |
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} |
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EXPORT_SYMBOL(acpi_run_osc); |
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|
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bool osc_sb_apei_support_acked; |
|
|
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/* |
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* ACPI 6.0 Section 8.4.4.2 Idle State Coordination |
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* OSPM supports platform coordinated low power idle(LPI) states |
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*/ |
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bool osc_pc_lpi_support_confirmed; |
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EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); |
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|
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/* |
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* ACPI 6.4 Operating System Capabilities for USB. |
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*/ |
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bool osc_sb_native_usb4_support_confirmed; |
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EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); |
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|
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static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; |
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static void acpi_bus_osc_negotiate_platform_control(void) |
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{ |
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u32 capbuf[2], *capbuf_ret; |
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struct acpi_osc_context context = { |
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.uuid_str = sb_uuid_str, |
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.rev = 1, |
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.cap.length = 8, |
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.cap.pointer = capbuf, |
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}; |
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acpi_handle handle; |
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|
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capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
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capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ |
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if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; |
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if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; |
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|
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; |
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|
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#ifdef CONFIG_ARM64 |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; |
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#endif |
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#ifdef CONFIG_X86 |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; |
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if (boot_cpu_has(X86_FEATURE_HWP)) { |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; |
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} |
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#endif |
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|
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if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; |
|
|
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if (IS_ENABLED(CONFIG_USB4)) |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT; |
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|
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if (!ghes_disable) |
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capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; |
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if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) |
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return; |
|
|
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if (ACPI_FAILURE(acpi_run_osc(handle, &context))) |
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return; |
|
|
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capbuf_ret = context.ret.pointer; |
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if (context.ret.length <= OSC_SUPPORT_DWORD) { |
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kfree(context.ret.pointer); |
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return; |
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} |
|
|
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/* |
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* Now run _OSC again with query flag clear and with the caps |
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* supported by both the OS and the platform. |
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*/ |
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capbuf[OSC_QUERY_DWORD] = 0; |
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capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD]; |
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kfree(context.ret.pointer); |
|
|
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if (ACPI_FAILURE(acpi_run_osc(handle, &context))) |
|
return; |
|
|
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capbuf_ret = context.ret.pointer; |
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if (context.ret.length > OSC_SUPPORT_DWORD) { |
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osc_sb_apei_support_acked = |
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capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; |
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osc_pc_lpi_support_confirmed = |
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capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; |
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osc_sb_native_usb4_support_confirmed = |
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capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT; |
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} |
|
|
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kfree(context.ret.pointer); |
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} |
|
|
|
/* |
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* Native control of USB4 capabilities. If any of the tunneling bits is |
|
* set it means OS is in control and we use software based connection |
|
* manager. |
|
*/ |
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u32 osc_sb_native_usb4_control; |
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EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); |
|
|
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static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) |
|
{ |
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printk(KERN_INFO PREFIX "%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg, |
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(bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', |
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(bits & OSC_USB_DP_TUNNELING) ? '+' : '-', |
|
(bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', |
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(bits & OSC_USB_XDOMAIN) ? '+' : '-'); |
|
} |
|
|
|
static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A"; |
|
static void acpi_bus_osc_negotiate_usb_control(void) |
|
{ |
|
u32 capbuf[3]; |
|
struct acpi_osc_context context = { |
|
.uuid_str = sb_usb_uuid_str, |
|
.rev = 1, |
|
.cap.length = sizeof(capbuf), |
|
.cap.pointer = capbuf, |
|
}; |
|
acpi_handle handle; |
|
acpi_status status; |
|
u32 control; |
|
|
|
if (!osc_sb_native_usb4_support_confirmed) |
|
return; |
|
|
|
if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) |
|
return; |
|
|
|
control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | |
|
OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; |
|
|
|
capbuf[OSC_QUERY_DWORD] = 0; |
|
capbuf[OSC_SUPPORT_DWORD] = 0; |
|
capbuf[OSC_CONTROL_DWORD] = control; |
|
|
|
status = acpi_run_osc(handle, &context); |
|
if (ACPI_FAILURE(status)) |
|
return; |
|
|
|
if (context.ret.length != sizeof(capbuf)) { |
|
printk(KERN_INFO PREFIX "USB4 _OSC: returned invalid length buffer\n"); |
|
goto out_free; |
|
} |
|
|
|
osc_sb_native_usb4_control = |
|
control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD]; |
|
|
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acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); |
|
acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", |
|
osc_sb_native_usb4_control); |
|
|
|
out_free: |
|
kfree(context.ret.pointer); |
|
} |
|
|
|
/* -------------------------------------------------------------------------- |
|
Notification Handling |
|
-------------------------------------------------------------------------- */ |
|
|
|
/** |
|
* acpi_bus_notify |
|
* --------------- |
|
* Callback for all 'system-level' device notifications (values 0x00-0x7F). |
|
*/ |
|
static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) |
|
{ |
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struct acpi_device *adev; |
|
struct acpi_driver *driver; |
|
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
|
bool hotplug_event = false; |
|
|
|
switch (type) { |
|
case ACPI_NOTIFY_BUS_CHECK: |
|
acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); |
|
hotplug_event = true; |
|
break; |
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK: |
|
acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); |
|
hotplug_event = true; |
|
break; |
|
|
|
case ACPI_NOTIFY_DEVICE_WAKE: |
|
acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); |
|
break; |
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST: |
|
acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); |
|
hotplug_event = true; |
|
break; |
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: |
|
acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); |
|
/* TBD: Exactly what does 'light' mean? */ |
|
break; |
|
|
|
case ACPI_NOTIFY_FREQUENCY_MISMATCH: |
|
acpi_handle_err(handle, "Device cannot be configured due " |
|
"to a frequency mismatch\n"); |
|
break; |
|
|
|
case ACPI_NOTIFY_BUS_MODE_MISMATCH: |
|
acpi_handle_err(handle, "Device cannot be configured due " |
|
"to a bus mode mismatch\n"); |
|
break; |
|
|
|
case ACPI_NOTIFY_POWER_FAULT: |
|
acpi_handle_err(handle, "Device has suffered a power fault\n"); |
|
break; |
|
|
|
default: |
|
acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); |
|
break; |
|
} |
|
|
|
adev = acpi_bus_get_acpi_device(handle); |
|
if (!adev) |
|
goto err; |
|
|
|
driver = adev->driver; |
|
if (driver && driver->ops.notify && |
|
(driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) |
|
driver->ops.notify(adev, type); |
|
|
|
if (!hotplug_event) { |
|
acpi_bus_put_acpi_device(adev); |
|
return; |
|
} |
|
|
|
if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) |
|
return; |
|
|
|
acpi_bus_put_acpi_device(adev); |
|
|
|
err: |
|
acpi_evaluate_ost(handle, type, ost_code, NULL); |
|
} |
|
|
|
static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
|
{ |
|
struct acpi_device *device = data; |
|
|
|
device->driver->ops.notify(device, event); |
|
} |
|
|
|
static void acpi_device_notify_fixed(void *data) |
|
{ |
|
struct acpi_device *device = data; |
|
|
|
/* Fixed hardware devices have no handles */ |
|
acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); |
|
} |
|
|
|
static u32 acpi_device_fixed_event(void *data) |
|
{ |
|
acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); |
|
return ACPI_INTERRUPT_HANDLED; |
|
} |
|
|
|
static int acpi_device_install_notify_handler(struct acpi_device *device) |
|
{ |
|
acpi_status status; |
|
|
|
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
|
status = |
|
acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
|
acpi_device_fixed_event, |
|
device); |
|
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
|
status = |
|
acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
|
acpi_device_fixed_event, |
|
device); |
|
else |
|
status = acpi_install_notify_handler(device->handle, |
|
ACPI_DEVICE_NOTIFY, |
|
acpi_device_notify, |
|
device); |
|
|
|
if (ACPI_FAILURE(status)) |
|
return -EINVAL; |
|
return 0; |
|
} |
|
|
|
static void acpi_device_remove_notify_handler(struct acpi_device *device) |
|
{ |
|
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
|
acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
|
acpi_device_fixed_event); |
|
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
|
acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
|
acpi_device_fixed_event); |
|
else |
|
acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
|
acpi_device_notify); |
|
} |
|
|
|
/* Handle events targeting \_SB device (at present only graceful shutdown) */ |
|
|
|
#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 |
|
#define ACPI_SB_INDICATE_INTERVAL 10000 |
|
|
|
static void sb_notify_work(struct work_struct *dummy) |
|
{ |
|
acpi_handle sb_handle; |
|
|
|
orderly_poweroff(true); |
|
|
|
/* |
|
* After initiating graceful shutdown, the ACPI spec requires OSPM |
|
* to evaluate _OST method once every 10seconds to indicate that |
|
* the shutdown is in progress |
|
*/ |
|
acpi_get_handle(NULL, "\\_SB", &sb_handle); |
|
while (1) { |
|
pr_info("Graceful shutdown in progress.\n"); |
|
acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, |
|
ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); |
|
msleep(ACPI_SB_INDICATE_INTERVAL); |
|
} |
|
} |
|
|
|
static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) |
|
{ |
|
static DECLARE_WORK(acpi_sb_work, sb_notify_work); |
|
|
|
if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { |
|
if (!work_busy(&acpi_sb_work)) |
|
schedule_work(&acpi_sb_work); |
|
} else |
|
pr_warn("event %x is not supported by \\_SB device\n", event); |
|
} |
|
|
|
static int __init acpi_setup_sb_notify_handler(void) |
|
{ |
|
acpi_handle sb_handle; |
|
|
|
if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) |
|
return -ENXIO; |
|
|
|
if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, |
|
acpi_sb_notify, NULL))) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
/* -------------------------------------------------------------------------- |
|
Device Matching |
|
-------------------------------------------------------------------------- */ |
|
|
|
/** |
|
* acpi_get_first_physical_node - Get first physical node of an ACPI device |
|
* @adev: ACPI device in question |
|
* |
|
* Return: First physical node of ACPI device @adev |
|
*/ |
|
struct device *acpi_get_first_physical_node(struct acpi_device *adev) |
|
{ |
|
struct mutex *physical_node_lock = &adev->physical_node_lock; |
|
struct device *phys_dev; |
|
|
|
mutex_lock(physical_node_lock); |
|
if (list_empty(&adev->physical_node_list)) { |
|
phys_dev = NULL; |
|
} else { |
|
const struct acpi_device_physical_node *node; |
|
|
|
node = list_first_entry(&adev->physical_node_list, |
|
struct acpi_device_physical_node, node); |
|
|
|
phys_dev = node->dev; |
|
} |
|
mutex_unlock(physical_node_lock); |
|
return phys_dev; |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); |
|
|
|
static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, |
|
const struct device *dev) |
|
{ |
|
const struct device *phys_dev = acpi_get_first_physical_node(adev); |
|
|
|
return phys_dev && phys_dev == dev ? adev : NULL; |
|
} |
|
|
|
/** |
|
* acpi_device_is_first_physical_node - Is given dev first physical node |
|
* @adev: ACPI companion device |
|
* @dev: Physical device to check |
|
* |
|
* Function checks if given @dev is the first physical devices attached to |
|
* the ACPI companion device. This distinction is needed in some cases |
|
* where the same companion device is shared between many physical devices. |
|
* |
|
* Note that the caller have to provide valid @adev pointer. |
|
*/ |
|
bool acpi_device_is_first_physical_node(struct acpi_device *adev, |
|
const struct device *dev) |
|
{ |
|
return !!acpi_primary_dev_companion(adev, dev); |
|
} |
|
|
|
/* |
|
* acpi_companion_match() - Can we match via ACPI companion device |
|
* @dev: Device in question |
|
* |
|
* Check if the given device has an ACPI companion and if that companion has |
|
* a valid list of PNP IDs, and if the device is the first (primary) physical |
|
* device associated with it. Return the companion pointer if that's the case |
|
* or NULL otherwise. |
|
* |
|
* If multiple physical devices are attached to a single ACPI companion, we need |
|
* to be careful. The usage scenario for this kind of relationship is that all |
|
* of the physical devices in question use resources provided by the ACPI |
|
* companion. A typical case is an MFD device where all the sub-devices share |
|
* the parent's ACPI companion. In such cases we can only allow the primary |
|
* (first) physical device to be matched with the help of the companion's PNP |
|
* IDs. |
|
* |
|
* Additional physical devices sharing the ACPI companion can still use |
|
* resources available from it but they will be matched normally using functions |
|
* provided by their bus types (and analogously for their modalias). |
|
*/ |
|
struct acpi_device *acpi_companion_match(const struct device *dev) |
|
{ |
|
struct acpi_device *adev; |
|
|
|
adev = ACPI_COMPANION(dev); |
|
if (!adev) |
|
return NULL; |
|
|
|
if (list_empty(&adev->pnp.ids)) |
|
return NULL; |
|
|
|
return acpi_primary_dev_companion(adev, dev); |
|
} |
|
|
|
/** |
|
* acpi_of_match_device - Match device object using the "compatible" property. |
|
* @adev: ACPI device object to match. |
|
* @of_match_table: List of device IDs to match against. |
|
* @of_id: OF ID if matched |
|
* |
|
* If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of |
|
* identifiers and a _DSD object with the "compatible" property, use that |
|
* property to match against the given list of identifiers. |
|
*/ |
|
static bool acpi_of_match_device(struct acpi_device *adev, |
|
const struct of_device_id *of_match_table, |
|
const struct of_device_id **of_id) |
|
{ |
|
const union acpi_object *of_compatible, *obj; |
|
int i, nval; |
|
|
|
if (!adev) |
|
return false; |
|
|
|
of_compatible = adev->data.of_compatible; |
|
if (!of_match_table || !of_compatible) |
|
return false; |
|
|
|
if (of_compatible->type == ACPI_TYPE_PACKAGE) { |
|
nval = of_compatible->package.count; |
|
obj = of_compatible->package.elements; |
|
} else { /* Must be ACPI_TYPE_STRING. */ |
|
nval = 1; |
|
obj = of_compatible; |
|
} |
|
/* Now we can look for the driver DT compatible strings */ |
|
for (i = 0; i < nval; i++, obj++) { |
|
const struct of_device_id *id; |
|
|
|
for (id = of_match_table; id->compatible[0]; id++) |
|
if (!strcasecmp(obj->string.pointer, id->compatible)) { |
|
if (of_id) |
|
*of_id = id; |
|
return true; |
|
} |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static bool acpi_of_modalias(struct acpi_device *adev, |
|
char *modalias, size_t len) |
|
{ |
|
const union acpi_object *of_compatible; |
|
const union acpi_object *obj; |
|
const char *str, *chr; |
|
|
|
of_compatible = adev->data.of_compatible; |
|
if (!of_compatible) |
|
return false; |
|
|
|
if (of_compatible->type == ACPI_TYPE_PACKAGE) |
|
obj = of_compatible->package.elements; |
|
else /* Must be ACPI_TYPE_STRING. */ |
|
obj = of_compatible; |
|
|
|
str = obj->string.pointer; |
|
chr = strchr(str, ','); |
|
strlcpy(modalias, chr ? chr + 1 : str, len); |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* acpi_set_modalias - Set modalias using "compatible" property or supplied ID |
|
* @adev: ACPI device object to match |
|
* @default_id: ID string to use as default if no compatible string found |
|
* @modalias: Pointer to buffer that modalias value will be copied into |
|
* @len: Length of modalias buffer |
|
* |
|
* This is a counterpart of of_modalias_node() for struct acpi_device objects. |
|
* If there is a compatible string for @adev, it will be copied to @modalias |
|
* with the vendor prefix stripped; otherwise, @default_id will be used. |
|
*/ |
|
void acpi_set_modalias(struct acpi_device *adev, const char *default_id, |
|
char *modalias, size_t len) |
|
{ |
|
if (!acpi_of_modalias(adev, modalias, len)) |
|
strlcpy(modalias, default_id, len); |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_set_modalias); |
|
|
|
static bool __acpi_match_device_cls(const struct acpi_device_id *id, |
|
struct acpi_hardware_id *hwid) |
|
{ |
|
int i, msk, byte_shift; |
|
char buf[3]; |
|
|
|
if (!id->cls) |
|
return false; |
|
|
|
/* Apply class-code bitmask, before checking each class-code byte */ |
|
for (i = 1; i <= 3; i++) { |
|
byte_shift = 8 * (3 - i); |
|
msk = (id->cls_msk >> byte_shift) & 0xFF; |
|
if (!msk) |
|
continue; |
|
|
|
sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); |
|
if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) |
|
return false; |
|
} |
|
return true; |
|
} |
|
|
|
static bool __acpi_match_device(struct acpi_device *device, |
|
const struct acpi_device_id *acpi_ids, |
|
const struct of_device_id *of_ids, |
|
const struct acpi_device_id **acpi_id, |
|
const struct of_device_id **of_id) |
|
{ |
|
const struct acpi_device_id *id; |
|
struct acpi_hardware_id *hwid; |
|
|
|
/* |
|
* If the device is not present, it is unnecessary to load device |
|
* driver for it. |
|
*/ |
|
if (!device || !device->status.present) |
|
return false; |
|
|
|
list_for_each_entry(hwid, &device->pnp.ids, list) { |
|
/* First, check the ACPI/PNP IDs provided by the caller. */ |
|
if (acpi_ids) { |
|
for (id = acpi_ids; id->id[0] || id->cls; id++) { |
|
if (id->id[0] && !strcmp((char *)id->id, hwid->id)) |
|
goto out_acpi_match; |
|
if (id->cls && __acpi_match_device_cls(id, hwid)) |
|
goto out_acpi_match; |
|
} |
|
} |
|
|
|
/* |
|
* Next, check ACPI_DT_NAMESPACE_HID and try to match the |
|
* "compatible" property if found. |
|
*/ |
|
if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) |
|
return acpi_of_match_device(device, of_ids, of_id); |
|
} |
|
return false; |
|
|
|
out_acpi_match: |
|
if (acpi_id) |
|
*acpi_id = id; |
|
return true; |
|
} |
|
|
|
/** |
|
* acpi_match_device - Match a struct device against a given list of ACPI IDs |
|
* @ids: Array of struct acpi_device_id object to match against. |
|
* @dev: The device structure to match. |
|
* |
|
* Check if @dev has a valid ACPI handle and if there is a struct acpi_device |
|
* object for that handle and use that object to match against a given list of |
|
* device IDs. |
|
* |
|
* Return a pointer to the first matching ID on success or %NULL on failure. |
|
*/ |
|
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, |
|
const struct device *dev) |
|
{ |
|
const struct acpi_device_id *id = NULL; |
|
|
|
__acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); |
|
return id; |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_match_device); |
|
|
|
static const void *acpi_of_device_get_match_data(const struct device *dev) |
|
{ |
|
struct acpi_device *adev = ACPI_COMPANION(dev); |
|
const struct of_device_id *match = NULL; |
|
|
|
if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) |
|
return NULL; |
|
|
|
return match->data; |
|
} |
|
|
|
const void *acpi_device_get_match_data(const struct device *dev) |
|
{ |
|
const struct acpi_device_id *match; |
|
|
|
if (!dev->driver->acpi_match_table) |
|
return acpi_of_device_get_match_data(dev); |
|
|
|
match = acpi_match_device(dev->driver->acpi_match_table, dev); |
|
if (!match) |
|
return NULL; |
|
|
|
return (const void *)match->driver_data; |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_device_get_match_data); |
|
|
|
int acpi_match_device_ids(struct acpi_device *device, |
|
const struct acpi_device_id *ids) |
|
{ |
|
return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; |
|
} |
|
EXPORT_SYMBOL(acpi_match_device_ids); |
|
|
|
bool acpi_driver_match_device(struct device *dev, |
|
const struct device_driver *drv) |
|
{ |
|
if (!drv->acpi_match_table) |
|
return acpi_of_match_device(ACPI_COMPANION(dev), |
|
drv->of_match_table, |
|
NULL); |
|
|
|
return __acpi_match_device(acpi_companion_match(dev), |
|
drv->acpi_match_table, drv->of_match_table, |
|
NULL, NULL); |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_driver_match_device); |
|
|
|
/* -------------------------------------------------------------------------- |
|
ACPI Driver Management |
|
-------------------------------------------------------------------------- */ |
|
|
|
/** |
|
* acpi_bus_register_driver - register a driver with the ACPI bus |
|
* @driver: driver being registered |
|
* |
|
* Registers a driver with the ACPI bus. Searches the namespace for all |
|
* devices that match the driver's criteria and binds. Returns zero for |
|
* success or a negative error status for failure. |
|
*/ |
|
int acpi_bus_register_driver(struct acpi_driver *driver) |
|
{ |
|
int ret; |
|
|
|
if (acpi_disabled) |
|
return -ENODEV; |
|
driver->drv.name = driver->name; |
|
driver->drv.bus = &acpi_bus_type; |
|
driver->drv.owner = driver->owner; |
|
|
|
ret = driver_register(&driver->drv); |
|
return ret; |
|
} |
|
|
|
EXPORT_SYMBOL(acpi_bus_register_driver); |
|
|
|
/** |
|
* acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
|
* @driver: driver to unregister |
|
* |
|
* Unregisters a driver with the ACPI bus. Searches the namespace for all |
|
* devices that match the driver's criteria and unbinds. |
|
*/ |
|
void acpi_bus_unregister_driver(struct acpi_driver *driver) |
|
{ |
|
driver_unregister(&driver->drv); |
|
} |
|
|
|
EXPORT_SYMBOL(acpi_bus_unregister_driver); |
|
|
|
/* -------------------------------------------------------------------------- |
|
ACPI Bus operations |
|
-------------------------------------------------------------------------- */ |
|
|
|
static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
|
{ |
|
struct acpi_device *acpi_dev = to_acpi_device(dev); |
|
struct acpi_driver *acpi_drv = to_acpi_driver(drv); |
|
|
|
return acpi_dev->flags.match_driver |
|
&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
|
} |
|
|
|
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
|
{ |
|
return __acpi_device_uevent_modalias(to_acpi_device(dev), env); |
|
} |
|
|
|
static int acpi_device_probe(struct device *dev) |
|
{ |
|
struct acpi_device *acpi_dev = to_acpi_device(dev); |
|
struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
|
int ret; |
|
|
|
if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) |
|
return -EINVAL; |
|
|
|
if (!acpi_drv->ops.add) |
|
return -ENOSYS; |
|
|
|
ret = acpi_drv->ops.add(acpi_dev); |
|
if (ret) |
|
return ret; |
|
|
|
acpi_dev->driver = acpi_drv; |
|
|
|
pr_debug("Driver [%s] successfully bound to device [%s]\n", |
|
acpi_drv->name, acpi_dev->pnp.bus_id); |
|
|
|
if (acpi_drv->ops.notify) { |
|
ret = acpi_device_install_notify_handler(acpi_dev); |
|
if (ret) { |
|
if (acpi_drv->ops.remove) |
|
acpi_drv->ops.remove(acpi_dev); |
|
|
|
acpi_dev->driver = NULL; |
|
acpi_dev->driver_data = NULL; |
|
return ret; |
|
} |
|
} |
|
|
|
pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name, |
|
acpi_dev->pnp.bus_id); |
|
|
|
get_device(dev); |
|
return 0; |
|
} |
|
|
|
static int acpi_device_remove(struct device *dev) |
|
{ |
|
struct acpi_device *acpi_dev = to_acpi_device(dev); |
|
struct acpi_driver *acpi_drv = acpi_dev->driver; |
|
|
|
if (acpi_drv) { |
|
if (acpi_drv->ops.notify) |
|
acpi_device_remove_notify_handler(acpi_dev); |
|
if (acpi_drv->ops.remove) |
|
acpi_drv->ops.remove(acpi_dev); |
|
} |
|
acpi_dev->driver = NULL; |
|
acpi_dev->driver_data = NULL; |
|
|
|
put_device(dev); |
|
return 0; |
|
} |
|
|
|
struct bus_type acpi_bus_type = { |
|
.name = "acpi", |
|
.match = acpi_bus_match, |
|
.probe = acpi_device_probe, |
|
.remove = acpi_device_remove, |
|
.uevent = acpi_device_uevent, |
|
}; |
|
|
|
/* -------------------------------------------------------------------------- |
|
Initialization/Cleanup |
|
-------------------------------------------------------------------------- */ |
|
|
|
static int __init acpi_bus_init_irq(void) |
|
{ |
|
acpi_status status; |
|
char *message = NULL; |
|
|
|
|
|
/* |
|
* Let the system know what interrupt model we are using by |
|
* evaluating the \_PIC object, if exists. |
|
*/ |
|
|
|
switch (acpi_irq_model) { |
|
case ACPI_IRQ_MODEL_PIC: |
|
message = "PIC"; |
|
break; |
|
case ACPI_IRQ_MODEL_IOAPIC: |
|
message = "IOAPIC"; |
|
break; |
|
case ACPI_IRQ_MODEL_IOSAPIC: |
|
message = "IOSAPIC"; |
|
break; |
|
case ACPI_IRQ_MODEL_GIC: |
|
message = "GIC"; |
|
break; |
|
case ACPI_IRQ_MODEL_PLATFORM: |
|
message = "platform specific model"; |
|
break; |
|
default: |
|
pr_info("Unknown interrupt routing model\n"); |
|
return -ENODEV; |
|
} |
|
|
|
pr_info("Using %s for interrupt routing\n", message); |
|
|
|
status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); |
|
if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
|
pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); |
|
return -ENODEV; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* acpi_early_init - Initialize ACPICA and populate the ACPI namespace. |
|
* |
|
* The ACPI tables are accessible after this, but the handling of events has not |
|
* been initialized and the global lock is not available yet, so AML should not |
|
* be executed at this point. |
|
* |
|
* Doing this before switching the EFI runtime services to virtual mode allows |
|
* the EfiBootServices memory to be freed slightly earlier on boot. |
|
*/ |
|
void __init acpi_early_init(void) |
|
{ |
|
acpi_status status; |
|
|
|
if (acpi_disabled) |
|
return; |
|
|
|
pr_info("Core revision %08x\n", ACPI_CA_VERSION); |
|
|
|
/* enable workarounds, unless strict ACPI spec. compliance */ |
|
if (!acpi_strict) |
|
acpi_gbl_enable_interpreter_slack = TRUE; |
|
|
|
acpi_permanent_mmap = true; |
|
|
|
#ifdef CONFIG_X86 |
|
/* |
|
* If the machine falls into the DMI check table, |
|
* DSDT will be copied to memory. |
|
* Note that calling dmi_check_system() here on other architectures |
|
* would not be OK because only x86 initializes dmi early enough. |
|
* Thankfully only x86 systems need such quirks for now. |
|
*/ |
|
dmi_check_system(dsdt_dmi_table); |
|
#endif |
|
|
|
status = acpi_reallocate_root_table(); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Unable to reallocate ACPI tables\n"); |
|
goto error0; |
|
} |
|
|
|
status = acpi_initialize_subsystem(); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Unable to initialize the ACPI Interpreter\n"); |
|
goto error0; |
|
} |
|
|
|
#ifdef CONFIG_X86 |
|
if (!acpi_ioapic) { |
|
/* compatible (0) means level (3) */ |
|
if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { |
|
acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; |
|
acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; |
|
} |
|
/* Set PIC-mode SCI trigger type */ |
|
acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, |
|
(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); |
|
} else { |
|
/* |
|
* now that acpi_gbl_FADT is initialized, |
|
* update it with result from INT_SRC_OVR parsing |
|
*/ |
|
acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; |
|
} |
|
#endif |
|
return; |
|
|
|
error0: |
|
disable_acpi(); |
|
} |
|
|
|
/** |
|
* acpi_subsystem_init - Finalize the early initialization of ACPI. |
|
* |
|
* Switch over the platform to the ACPI mode (if possible). |
|
* |
|
* Doing this too early is generally unsafe, but at the same time it needs to be |
|
* done before all things that really depend on ACPI. The right spot appears to |
|
* be before finalizing the EFI initialization. |
|
*/ |
|
void __init acpi_subsystem_init(void) |
|
{ |
|
acpi_status status; |
|
|
|
if (acpi_disabled) |
|
return; |
|
|
|
status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Unable to enable ACPI\n"); |
|
disable_acpi(); |
|
} else { |
|
/* |
|
* If the system is using ACPI then we can be reasonably |
|
* confident that any regulators are managed by the firmware |
|
* so tell the regulator core it has everything it needs to |
|
* know. |
|
*/ |
|
regulator_has_full_constraints(); |
|
} |
|
} |
|
|
|
static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) |
|
{ |
|
acpi_scan_table_handler(event, table, context); |
|
|
|
return acpi_sysfs_table_handler(event, table, context); |
|
} |
|
|
|
static int __init acpi_bus_init(void) |
|
{ |
|
int result; |
|
acpi_status status; |
|
|
|
acpi_os_initialize1(); |
|
|
|
status = acpi_load_tables(); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Unable to load the System Description Tables\n"); |
|
goto error1; |
|
} |
|
|
|
/* |
|
* ACPI 2.0 requires the EC driver to be loaded and work before the EC |
|
* device is found in the namespace. |
|
* |
|
* This is accomplished by looking for the ECDT table and getting the EC |
|
* parameters out of that. |
|
* |
|
* Do that before calling acpi_initialize_objects() which may trigger EC |
|
* address space accesses. |
|
*/ |
|
acpi_ec_ecdt_probe(); |
|
|
|
status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Unable to start the ACPI Interpreter\n"); |
|
goto error1; |
|
} |
|
|
|
status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Unable to initialize ACPI objects\n"); |
|
goto error1; |
|
} |
|
|
|
/* Set capability bits for _OSC under processor scope */ |
|
acpi_early_processor_osc(); |
|
|
|
/* |
|
* _OSC method may exist in module level code, |
|
* so it must be run after ACPI_FULL_INITIALIZATION |
|
*/ |
|
acpi_bus_osc_negotiate_platform_control(); |
|
acpi_bus_osc_negotiate_usb_control(); |
|
|
|
/* |
|
* _PDC control method may load dynamic SSDT tables, |
|
* and we need to install the table handler before that. |
|
*/ |
|
status = acpi_install_table_handler(acpi_bus_table_handler, NULL); |
|
|
|
acpi_sysfs_init(); |
|
|
|
acpi_early_processor_set_pdc(); |
|
|
|
/* |
|
* Maybe EC region is required at bus_scan/acpi_get_devices. So it |
|
* is necessary to enable it as early as possible. |
|
*/ |
|
acpi_ec_dsdt_probe(); |
|
|
|
pr_info("Interpreter enabled\n"); |
|
|
|
/* Initialize sleep structures */ |
|
acpi_sleep_init(); |
|
|
|
/* |
|
* Get the system interrupt model and evaluate \_PIC. |
|
*/ |
|
result = acpi_bus_init_irq(); |
|
if (result) |
|
goto error1; |
|
|
|
/* |
|
* Register the for all standard device notifications. |
|
*/ |
|
status = |
|
acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, |
|
&acpi_bus_notify, NULL); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Unable to register for system notifications\n"); |
|
goto error1; |
|
} |
|
|
|
/* |
|
* Create the top ACPI proc directory |
|
*/ |
|
acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); |
|
|
|
result = bus_register(&acpi_bus_type); |
|
if (!result) |
|
return 0; |
|
|
|
/* Mimic structured exception handling */ |
|
error1: |
|
acpi_terminate(); |
|
return -ENODEV; |
|
} |
|
|
|
struct kobject *acpi_kobj; |
|
EXPORT_SYMBOL_GPL(acpi_kobj); |
|
|
|
static int __init acpi_init(void) |
|
{ |
|
int result; |
|
|
|
if (acpi_disabled) { |
|
pr_info("Interpreter disabled.\n"); |
|
return -ENODEV; |
|
} |
|
|
|
acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); |
|
if (!acpi_kobj) { |
|
pr_debug("%s: kset create error\n", __func__); |
|
acpi_kobj = NULL; |
|
} |
|
|
|
result = acpi_bus_init(); |
|
if (result) { |
|
disable_acpi(); |
|
return result; |
|
} |
|
|
|
pci_mmcfg_late_init(); |
|
acpi_iort_init(); |
|
acpi_scan_init(); |
|
acpi_ec_init(); |
|
acpi_debugfs_init(); |
|
acpi_sleep_proc_init(); |
|
acpi_wakeup_device_init(); |
|
acpi_debugger_init(); |
|
acpi_setup_sb_notify_handler(); |
|
return 0; |
|
} |
|
|
|
subsys_initcall(acpi_init);
|
|
|