ACPI: dock: add access to ACPI docking station UID

It is useful to know whether your laptop is docked or not,
but it is even more useful to know which docking station it's
docked to. Attached patch adds "uid" file to sysfs.
Tested on Dell Latitude D600 with D/Dock.
Patch is against official 2.6.20 release.

Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 54a697f9aa1873400cd2ad1237b786e4f3f9550e..811b1aac65d566f9c215f926d2987db2a384b5ff 100644 (file)
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -667,6 +667,23 @@ static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
 }
 DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock);
 
+/*
+ * show_dock_uid - read method for "uid" file in sysfs
+ */
+static ssize_t show_dock_uid(struct device *dev,
+                            struct device_attribute *attr, char *buf)
+{
+       unsigned long lbuf;
+       acpi_status status = acpi_evaluate_integer(dock_station->handle, "_UID", 0, &lbuf);
+       if(ACPI_FAILURE(status)) {
+           return 0;
+       }
+       return snprintf(buf, PAGE_SIZE, "%lx\n", lbuf);
+}
+DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL);
+
+
+
 /**
  * dock_add - add a new dock station
  * @handle: the dock station handle
@@ -715,6 +732,13 @@ static int dock_add(acpi_handle handle)
                kfree(dock_station);
                return ret;
        }
+       ret = device_create_file(&dock_device.dev, &dev_attr_uid);
+       if (ret) {
+               printk("Error %d adding sysfs file\n", ret);
+               platform_device_unregister(&dock_device);
+               kfree(dock_station);
+               return ret;
+       }
 
        /* Find dependent devices */
        acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,