1 files changed, 203 insertions, 11 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 0476e90b2091..16914cc30882 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -36,6 +36,8 @@ bool acpi_force_hot_remove;
 
 static const char *dummy_hid = "device";
 
+static LIST_HEAD(acpi_dep_list);
+static DEFINE_MUTEX(acpi_dep_list_lock);
 static LIST_HEAD(acpi_bus_id_list);
 static DEFINE_MUTEX(acpi_scan_lock);
 static LIST_HEAD(acpi_scan_handlers_list);
@@ -43,6 +45,12 @@ DEFINE_MUTEX(acpi_device_lock);
 LIST_HEAD(acpi_wakeup_device_list);
 static DEFINE_MUTEX(acpi_hp_context_lock);
 
+struct acpi_dep_data {
+        struct list_head node;
+        acpi_handle master;
+        acpi_handle slave;
+};
+
 struct acpi_device_bus_id{
         char bus_id[15];
         unsigned int instance_no;
@@ -124,17 +132,56 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
         if (list_empty(&acpi_dev->pnp.ids))
                 return 0;
 
-        len = snprintf(modalias, size, "acpi:");
-        size -= len;
-
-        list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
-                count = snprintf(&modalias[len], size, "%s:", id->id);
-                if (count < 0)
-                        return -EINVAL;
-                if (count >= size)
-                        return -ENOMEM;
-                len += count;
-                size -= count;
+        /*
+         * If the device has PRP0001 we expose DT compatible modalias
+         * instead in form of of:NnameTCcompatible.
+         */
+        if (acpi_dev->data.of_compatible) {
+                struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+                const union acpi_object *of_compatible, *obj;
+                int i, nval;
+                char *c;
+
+                acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
+                /* DT strings are all in lower case */
+                for (c = buf.pointer; *c != '\0'; c++)
+                        *c = tolower(*c);
+
+                len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);
+                ACPI_FREE(buf.pointer);
+
+                of_compatible = acpi_dev->data.of_compatible;
+                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;
+                }
+                for (i = 0; i < nval; i++, obj++) {
+                        count = snprintf(&modalias[len], size, "C%s",
+                                         obj->string.pointer);
+                        if (count < 0)
+                                return -EINVAL;
+                        if (count >= size)
+                                return -ENOMEM;
+
+                        len += count;
+                        size -= count;
+                }
+        } else {
+                len = snprintf(modalias, size, "acpi:");
+                size -= len;
+
+                list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
+                        count = snprintf(&modalias[len], size, "%s:", id->id);
+                        if (count < 0)
+                                return -EINVAL;
+                        if (count >= size)
+                                return -ENOMEM;
+                        len += count;
+                        size -= count;
+                }
         }
 
         modalias[len] = '\0';
@@ -902,6 +949,51 @@ int acpi_match_device_ids(struct acpi_device *device,
 }
 EXPORT_SYMBOL(acpi_match_device_ids);
 
+/* Performs match against special "PRP0001" shoehorn ACPI ID */
+static bool acpi_of_driver_match_device(struct device *dev,
+                                        const struct device_driver *drv)
+{
+        const union acpi_object *of_compatible, *obj;
+        struct acpi_device *adev;
+        int i, nval;
+
+        adev = ACPI_COMPANION(dev);
+        if (!adev)
+                return false;
+
+        of_compatible = adev->data.of_compatible;
+        if (!drv->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 = drv->of_match_table; id->compatible[0]; id++)
+                        if (!strcasecmp(obj->string.pointer, id->compatible))
+                                return true;
+        }
+
+        return false;
+}
+
+bool acpi_driver_match_device(struct device *dev,
+                              const struct device_driver *drv)
+{
+        if (!drv->acpi_match_table)
+                return acpi_of_driver_match_device(dev, drv);
+
+        return !!acpi_match_device(drv->acpi_match_table, dev);
+}
+EXPORT_SYMBOL_GPL(acpi_driver_match_device);
+
 static void acpi_free_power_resources_lists(struct acpi_device *device)
 {
         int i;
@@ -922,6 +1014,7 @@ static void acpi_device_release(struct device *dev)
 {
         struct acpi_device *acpi_dev = to_acpi_device(dev);
 
+        acpi_free_properties(acpi_dev);
         acpi_free_pnp_ids(&acpi_dev->pnp);
         acpi_free_power_resources_lists(acpi_dev);
         kfree(acpi_dev);
@@ -1304,6 +1397,26 @@ int acpi_device_add(struct acpi_device *device,
         return result;
 }
 
+struct acpi_device *acpi_get_next_child(struct device *dev,
+                                        struct acpi_device *child)
+{
+        struct acpi_device *adev = ACPI_COMPANION(dev);
+        struct list_head *head, *next;
+
+        if (!adev)
+                return NULL;
+
+        head = &adev->children;
+        if (list_empty(head))
+                return NULL;
+
+        if (!child)
+                return list_first_entry(head, struct acpi_device, node);
+
+        next = child->node.next;
+        return next == head ? NULL : list_entry(next, struct acpi_device, node);
+}
+
 /* --------------------------------------------------------------------------
                                  Driver Management
    -------------------------------------------------------------------------- */
@@ -1923,9 +2036,11 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
         device->device_type = type;
         device->handle = handle;
         device->parent = acpi_bus_get_parent(handle);
+        device->fwnode.type = FWNODE_ACPI;
         acpi_set_device_status(device, sta);
         acpi_device_get_busid(device);
         acpi_set_pnp_ids(handle, &device->pnp, type);
+        acpi_init_properties(device);
         acpi_bus_get_flags(device);
         device->flags.match_driver = false;
         device->flags.initialized = true;
@@ -2086,6 +2201,59 @@ static void acpi_scan_init_hotplug(struct acpi_device *adev)
         }
 }
 
+static void acpi_device_dep_initialize(struct acpi_device *adev)
+{
+        struct acpi_dep_data *dep;
+        struct acpi_handle_list dep_devices;
+        acpi_status status;
+        int i;
+
+        if (!acpi_has_method(adev->handle, "_DEP"))
+                return;
+
+        status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
+                                        &dep_devices);
+        if (ACPI_FAILURE(status)) {
+                dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
+                return;
+        }
+
+        for (i = 0; i < dep_devices.count; i++) {
+                struct acpi_device_info *info;
+                int skip;
+
+                status = acpi_get_object_info(dep_devices.handles[i], &info);
+                if (ACPI_FAILURE(status)) {
+                        dev_dbg(&adev->dev, "Error reading _DEP device info\n");
+                        continue;
+                }
+
+                /*
+                 * Skip the dependency of Windows System Power
+                 * Management Controller
+                 */
+                skip = info->valid & ACPI_VALID_HID &&
+                        !strcmp(info->hardware_id.string, "INT3396");
+
+                kfree(info);
+
+                if (skip)
+                        continue;
+
+                dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
+                if (!dep)
+                        return;
+
+                dep->master = dep_devices.handles[i];
+                dep->slave  = adev->handle;
+                adev->dep_unmet++;
+
+                mutex_lock(&acpi_dep_list_lock);
+                list_add_tail(&dep->node , &acpi_dep_list);
+                mutex_unlock(&acpi_dep_list_lock);
+        }
+}
+
 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
                                       void *not_used, void **return_value)
 {
@@ -2112,6 +2280,7 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
                 return AE_CTRL_DEPTH;
 
         acpi_scan_init_hotplug(device);
+        acpi_device_dep_initialize(device);
 
  out:
         if (!*return_value)
@@ -2232,6 +2401,29 @@ static void acpi_bus_attach(struct acpi_device *device)
                 device->handler->hotplug.notify_online(device);
 }
 
+void acpi_walk_dep_device_list(acpi_handle handle)
+{
+        struct acpi_dep_data *dep, *tmp;
+        struct acpi_device *adev;
+
+        mutex_lock(&acpi_dep_list_lock);
+        list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
+                if (dep->master == handle) {
+                        acpi_bus_get_device(dep->slave, &adev);
+                        if (!adev)
+                                continue;
+
+                        adev->dep_unmet--;
+                        if (!adev->dep_unmet)
+                                acpi_bus_attach(adev);
+                        list_del(&dep->node);
+                        kfree(dep);
+                }
+        }
+        mutex_unlock(&acpi_dep_list_lock);
+}
+EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
+
 /**
  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
  * @handle: Root of the namespace scope to scan.