auto import from //depot/cupcake/@135843
diff --git a/vold/ums.c b/vold/ums.c
new file mode 100644
index 0000000..4d0fc25
--- /dev/null
+++ b/vold/ums.c
@@ -0,0 +1,129 @@
+
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <fcntl.h>
+#include <errno.h>
+
+#include "vold.h"
+#include "ums.h"
+
+#define DEBUG_UMS 0
+
+static boolean host_connected = false;
+static boolean ums_enabled = false;
+
+int ums_bootstrap(void)
+{
+ return 0;
+}
+
+void ums_enabled_set(boolean enabled)
+{
+ ums_enabled = enabled;
+ send_msg(enabled ? VOLD_EVT_UMS_ENABLED : VOLD_EVT_UMS_DISABLED);
+}
+
+boolean ums_enabled_get()
+{
+ return ums_enabled;
+}
+
+void ums_hostconnected_set(boolean connected)
+{
+#if DEBUG_UMS
+ LOG_VOL("ums_hostconnected_set(%d):", connected);
+#endif
+ host_connected = connected;
+
+ if (!connected)
+ ums_enabled_set(false);
+ send_msg(connected ? VOLD_EVT_UMS_CONNECTED : VOLD_EVT_UMS_DISCONNECTED);
+}
+
+int ums_enable(char *dev_fspath, char *lun_syspath)
+{
+ LOG_VOL("ums_enable(%s, %s):", dev_fspath, lun_syspath);
+
+ int fd;
+ char filename[255];
+
+ sprintf(filename, "/sys/%s/file", lun_syspath);
+ if ((fd = open(filename, O_WRONLY)) < 0) {
+ LOGE("Unable to open '%s' (%s)", filename, strerror(errno));
+ return -errno;
+ }
+
+ if (write(fd, dev_fspath, strlen(dev_fspath)) < 0) {
+ LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
+ close(fd);
+ return -errno;
+ }
+
+ close(fd);
+ return 0;
+}
+
+int ums_disable(char *lun_syspath)
+{
+#if DEBUG_UMS
+ LOG_VOL("ums_disable(%s):", lun_syspath);
+#endif
+
+ int fd;
+ char filename[255];
+
+ sprintf(filename, "/sys/%s/file", lun_syspath);
+ if ((fd = open(filename, O_WRONLY)) < 0) {
+ LOGE("Unable to open '%s' (%s)", filename, strerror(errno));
+ return -errno;
+ }
+
+ char ch = 0;
+
+ if (write(fd, &ch, 1) < 0) {
+ LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
+ close(fd);
+ return -errno;
+ }
+
+ close(fd);
+ return 0;
+}
+
+boolean ums_hostconnected_get(void)
+{
+ return host_connected;
+}
+
+int ums_send_status(void)
+{
+ int rc;
+
+#if DEBUG_UMS
+ LOG_VOL("ums_send_status():");
+#endif
+
+ rc = send_msg(ums_enabled_get() ? VOLD_EVT_UMS_ENABLED :
+ VOLD_EVT_UMS_DISABLED);
+ if (rc < 0)
+ return rc;
+
+ rc = send_msg(ums_hostconnected_get() ? VOLD_EVT_UMS_CONNECTED :
+ VOLD_EVT_UMS_DISCONNECTED);
+
+ return rc;
+}