Merge branches 'acpica', 'acpidump', 'intel-idle', 'misc', 'module_acpi_driver-simpli...

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / scan.c

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index d1ecca2b641a97f541dfdb18f1358738025f3ba7..1fcb8678665c0e89113da39e0f603db2d49eeccb 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -10,6 +10,7 @@
 #include <linux/signal.h>
 #include <linux/kthread.h>
 #include <linux/dmi.h>
+#include <linux/nls.h>
 
 #include <acpi/acpi_drivers.h>
 
@@ -232,8 +233,35 @@ end:
 }
 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 
+/* sysfs file that shows description text from the ACPI _STR method */
+static ssize_t description_show(struct device *dev,
+                               struct device_attribute *attr,
+                               char *buf) {
+       struct acpi_device *acpi_dev = to_acpi_device(dev);
+       int result;
+
+       if (acpi_dev->pnp.str_obj == NULL)
+               return 0;
+
+       /*
+        * The _STR object contains a Unicode identifier for a device.
+        * We need to convert to utf-8 so it can be displayed.
+        */
+       result = utf16s_to_utf8s(
+               (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
+               acpi_dev->pnp.str_obj->buffer.length,
+               UTF16_LITTLE_ENDIAN, buf,
+               PAGE_SIZE);
+
+       buf[result++] = '\n';
+
+       return result;
+}
+static DEVICE_ATTR(description, 0444, description_show, NULL);
+
 static int acpi_device_setup_files(struct acpi_device *dev)
 {
+       struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
        acpi_status status;
        acpi_handle temp;
        int result = 0;
@@ -257,6 +285,21 @@ static int acpi_device_setup_files(struct acpi_device *dev)
                        goto end;
        }
 
+       /*
+        * If device has _STR, 'description' file is created
+        */
+       status = acpi_get_handle(dev->handle, "_STR", &temp);
+       if (ACPI_SUCCESS(status)) {
+               status = acpi_evaluate_object(dev->handle, "_STR",
+                                       NULL, &buffer);
+               if (ACPI_FAILURE(status))
+                       buffer.pointer = NULL;
+               dev->pnp.str_obj = buffer.pointer;
+               result = device_create_file(&dev->dev, &dev_attr_description);
+               if (result)
+                       goto end;
+       }
+
         /*
          * If device has _EJ0, 'eject' file is created that is used to trigger
          * hot-removal function from userland.
@@ -274,8 +317,15 @@ static void acpi_device_remove_files(struct acpi_device *dev)
        acpi_handle temp;
 
        /*
-        * If device has _EJ0, 'eject' file is created that is used to trigger
-        * hot-removal function from userland.
+        * If device has _STR, remove 'description' file
+        */
+       status = acpi_get_handle(dev->handle, "_STR", &temp);
+       if (ACPI_SUCCESS(status)) {
+               kfree(dev->pnp.str_obj);
+               device_remove_file(&dev->dev, &dev_attr_description);
+       }
+       /*
+        * If device has _EJ0, remove 'eject' file.
         */
        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
        if (ACPI_SUCCESS(status))
@@ -481,6 +531,8 @@ static int acpi_device_register(struct acpi_device *device)
        INIT_LIST_HEAD(&device->children);
        INIT_LIST_HEAD(&device->node);
        INIT_LIST_HEAD(&device->wakeup_list);
+       INIT_LIST_HEAD(&device->physical_node_list);
+       mutex_init(&device->physical_node_lock);
 
        new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
        if (!new_bus_id) {