v4.19.13 snapshot.
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
new file mode 100644
index 0000000..d2e29a1
--- /dev/null
+++ b/drivers/acpi/bus.c
@@ -0,0 +1,1271 @@
+/*
+ * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/proc_fs.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+#include <linux/regulator/machine.h>
+#include <linux/workqueue.h>
+#include <linux/reboot.h>
+#include <linux/delay.h>
+#ifdef CONFIG_X86
+#include <asm/mpspec.h>
+#include <linux/dmi.h>
+#endif
+#include <linux/acpi_iort.h>
+#include <linux/pci.h>
+#include <acpi/apei.h>
+#include <linux/suspend.h>
+
+#include "internal.h"
+
+#define _COMPONENT ACPI_BUS_COMPONENT
+ACPI_MODULE_NAME("bus");
+
+struct acpi_device *acpi_root;
+struct proc_dir_entry *acpi_root_dir;
+EXPORT_SYMBOL(acpi_root_dir);
+
+#ifdef CONFIG_X86
+#ifdef CONFIG_ACPI_CUSTOM_DSDT
+static inline int set_copy_dsdt(const struct dmi_system_id *id)
+{
+ return 0;
+}
+#else
+static int set_copy_dsdt(const struct dmi_system_id *id)
+{
+ printk(KERN_NOTICE "%s detected - "
+ "force copy of DSDT to local memory\n", id->ident);
+ acpi_gbl_copy_dsdt_locally = 1;
+ return 0;
+}
+#endif
+
+static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
+ /*
+ * Invoke DSDT corruption work-around on all Toshiba Satellite.
+ * https://bugzilla.kernel.org/show_bug.cgi?id=14679
+ */
+ {
+ .callback = set_copy_dsdt,
+ .ident = "TOSHIBA Satellite",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
+ },
+ },
+ {}
+};
+#endif
+
+/* --------------------------------------------------------------------------
+ Device Management
+ -------------------------------------------------------------------------- */
+
+acpi_status acpi_bus_get_status_handle(acpi_handle handle,
+ unsigned long long *sta)
+{
+ acpi_status status;
+
+ status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
+ if (ACPI_SUCCESS(status))
+ return AE_OK;
+
+ if (status == AE_NOT_FOUND) {
+ *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
+ ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
+ return AE_OK;
+ }
+ return status;
+}
+EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
+
+int acpi_bus_get_status(struct acpi_device *device)
+{
+ acpi_status status;
+ unsigned long long sta;
+
+ if (acpi_device_always_present(device)) {
+ acpi_set_device_status(device, ACPI_STA_DEFAULT);
+ return 0;
+ }
+
+ /* Battery devices must have their deps met before calling _STA */
+ if (acpi_device_is_battery(device) && device->dep_unmet) {
+ acpi_set_device_status(device, 0);
+ return 0;
+ }
+
+ status = acpi_bus_get_status_handle(device->handle, &sta);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ acpi_set_device_status(device, sta);
+
+ if (device->status.functional && !device->status.present) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
+ "functional but not present;\n",
+ device->pnp.bus_id, (u32)sta));
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
+ device->pnp.bus_id, (u32)sta));
+ return 0;
+}
+EXPORT_SYMBOL(acpi_bus_get_status);
+
+void acpi_bus_private_data_handler(acpi_handle handle,
+ void *context)
+{
+ return;
+}
+EXPORT_SYMBOL(acpi_bus_private_data_handler);
+
+int acpi_bus_attach_private_data(acpi_handle handle, void *data)
+{
+ acpi_status status;
+
+ status = acpi_attach_data(handle,
+ acpi_bus_private_data_handler, data);
+ if (ACPI_FAILURE(status)) {
+ acpi_handle_debug(handle, "Error attaching device data\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
+
+int acpi_bus_get_private_data(acpi_handle handle, void **data)
+{
+ acpi_status status;
+
+ if (!*data)
+ return -EINVAL;
+
+ status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
+ if (ACPI_FAILURE(status)) {
+ acpi_handle_debug(handle, "No context for object\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
+
+void acpi_bus_detach_private_data(acpi_handle handle)
+{
+ acpi_detach_data(handle, acpi_bus_private_data_handler);
+}
+EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
+
+static void acpi_print_osc_error(acpi_handle handle,
+ struct acpi_osc_context *context, char *error)
+{
+ int i;
+
+ acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
+
+ pr_debug("_OSC request data:");
+ for (i = 0; i < context->cap.length; i += sizeof(u32))
+ pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
+
+ pr_debug("\n");
+}
+
+acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
+{
+ acpi_status status;
+ struct acpi_object_list input;
+ union acpi_object in_params[4];
+ union acpi_object *out_obj;
+ guid_t guid;
+ u32 errors;
+ struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
+
+ if (!context)
+ return AE_ERROR;
+ if (guid_parse(context->uuid_str, &guid))
+ return AE_ERROR;
+ context->ret.length = ACPI_ALLOCATE_BUFFER;
+ context->ret.pointer = NULL;
+
+ /* Setting up input parameters */
+ input.count = 4;
+ input.pointer = in_params;
+ in_params[0].type = ACPI_TYPE_BUFFER;
+ in_params[0].buffer.length = 16;
+ in_params[0].buffer.pointer = (u8 *)&guid;
+ in_params[1].type = ACPI_TYPE_INTEGER;
+ in_params[1].integer.value = context->rev;
+ in_params[2].type = ACPI_TYPE_INTEGER;
+ in_params[2].integer.value = context->cap.length/sizeof(u32);
+ in_params[3].type = ACPI_TYPE_BUFFER;
+ in_params[3].buffer.length = context->cap.length;
+ in_params[3].buffer.pointer = context->cap.pointer;
+
+ status = acpi_evaluate_object(handle, "_OSC", &input, &output);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ if (!output.length)
+ return AE_NULL_OBJECT;
+
+ out_obj = output.pointer;
+ if (out_obj->type != ACPI_TYPE_BUFFER
+ || out_obj->buffer.length != context->cap.length) {
+ acpi_print_osc_error(handle, context,
+ "_OSC evaluation returned wrong type");
+ status = AE_TYPE;
+ goto out_kfree;
+ }
+ /* Need to ignore the bit0 in result code */
+ errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
+ if (errors) {
+ if (errors & OSC_REQUEST_ERROR)
+ acpi_print_osc_error(handle, context,
+ "_OSC request failed");
+ if (errors & OSC_INVALID_UUID_ERROR)
+ acpi_print_osc_error(handle, context,
+ "_OSC invalid UUID");
+ if (errors & OSC_INVALID_REVISION_ERROR)
+ acpi_print_osc_error(handle, context,
+ "_OSC invalid revision");
+ if (errors & OSC_CAPABILITIES_MASK_ERROR) {
+ if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
+ & OSC_QUERY_ENABLE)
+ goto out_success;
+ status = AE_SUPPORT;
+ goto out_kfree;
+ }
+ status = AE_ERROR;
+ goto out_kfree;
+ }
+out_success:
+ context->ret.length = out_obj->buffer.length;
+ context->ret.pointer = kmemdup(out_obj->buffer.pointer,
+ context->ret.length, GFP_KERNEL);
+ if (!context->ret.pointer) {
+ status = AE_NO_MEMORY;
+ goto out_kfree;
+ }
+ status = AE_OK;
+
+out_kfree:
+ kfree(output.pointer);
+ if (status != AE_OK)
+ context->ret.pointer = NULL;
+ return status;
+}
+EXPORT_SYMBOL(acpi_run_osc);
+
+bool osc_sb_apei_support_acked;
+
+/*
+ * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
+ * OSPM supports platform coordinated low power idle(LPI) states
+ */
+bool osc_pc_lpi_support_confirmed;
+EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
+
+static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
+static void acpi_bus_osc_support(void)
+{
+ u32 capbuf[2];
+ struct acpi_osc_context context = {
+ .uuid_str = sb_uuid_str,
+ .rev = 1,
+ .cap.length = 8,
+ .cap.pointer = capbuf,
+ };
+ acpi_handle handle;
+
+ capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
+ capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
+ if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
+ if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
+
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
+
+#ifdef CONFIG_X86
+ if (boot_cpu_has(X86_FEATURE_HWP)) {
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
+ }
+#endif
+
+ if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
+
+ if (!ghes_disable)
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
+ if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+ return;
+ if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
+ u32 *capbuf_ret = context.ret.pointer;
+ if (context.ret.length > OSC_SUPPORT_DWORD) {
+ osc_sb_apei_support_acked =
+ capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
+ osc_pc_lpi_support_confirmed =
+ capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
+ }
+ kfree(context.ret.pointer);
+ }
+ /* do we need to check other returned cap? Sounds no */
+}
+
+/* --------------------------------------------------------------------------
+ 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)
+{
+ 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;
+}
+
+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);
+
+const void *acpi_device_get_match_data(const struct device *dev)
+{
+ const struct acpi_device_id *match;
+
+ 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;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "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;
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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:
+ printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
+ return -ENODEV;
+ }
+
+ printk(KERN_INFO PREFIX "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)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
+ 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;
+
+ printk(KERN_INFO PREFIX "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)) {
+ printk(KERN_ERR PREFIX
+ "Unable to reallocate ACPI tables\n");
+ goto error0;
+ }
+
+ status = acpi_initialize_subsystem();
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX
+ "Unable to initialize the ACPI Interpreter\n");
+ goto error0;
+ }
+
+ if (!acpi_gbl_execute_tables_as_methods &&
+ acpi_gbl_group_module_level_code) {
+ status = acpi_load_tables();
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX
+ "Unable to load the System Description Tables\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)) {
+ printk(KERN_ERR PREFIX "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();
+
+ /*
+ * ACPI 2.0 requires the EC driver to be loaded and work before
+ * the EC device is found in the namespace (i.e. before
+ * acpi_load_tables() is called).
+ *
+ * This is accomplished by looking for the ECDT table, and getting
+ * the EC parameters out of that.
+ */
+ status = acpi_ec_ecdt_probe();
+ /* Ignore result. Not having an ECDT is not fatal. */
+
+ if (acpi_gbl_execute_tables_as_methods ||
+ !acpi_gbl_group_module_level_code) {
+ status = acpi_load_tables();
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX
+ "Unable to load the System Description Tables\n");
+ goto error1;
+ }
+ }
+
+ status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX
+ "Unable to start the ACPI Interpreter\n");
+ goto error1;
+ }
+
+ status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX "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_support();
+
+ /*
+ * _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();
+
+ printk(KERN_INFO PREFIX "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)) {
+ printk(KERN_ERR PREFIX
+ "Unable to register for device 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) {
+ printk(KERN_INFO PREFIX "Interpreter disabled.\n");
+ return -ENODEV;
+ }
+
+ acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
+ if (!acpi_kobj) {
+ printk(KERN_WARNING "%s: kset create error\n", __func__);
+ acpi_kobj = NULL;
+ }
+
+ init_acpi_device_notify();
+ 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);