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path: root/drivers/acpi/dock.c
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Diffstat (limited to 'drivers/acpi/dock.c')
-rw-r--r--drivers/acpi/dock.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 54a697f9aa1..4546bf873ae 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -29,6 +29,7 @@
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
+#include <linux/stddef.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@@ -667,6 +668,23 @@ 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", NULL, &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 +733,13 @@ 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,