usb: misc: Add snapshot of diag_bridge driver

Add diag_bridge driver which is used to communicate with the diag
and QMI interfaces exposed by Qualcomm devices. This snapshot is
taken as of msm-3.10 'commit d722f698a54e ("regulator: core: Fix
buffer overflow issue")'.
Also rename the diag_bridge driver to diag_ipc_bridge.c.

Change-Id: Ide503c5bf729a7e41de98b12c89e4edc12af61fe
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/include/linux/usb/diag_bridge.h b/include/linux/usb/diag_bridge.h
new file mode 100644
index 000000000000..e82c65330722
--- /dev/null
+++ b/include/linux/usb/diag_bridge.h
@@ -0,0 +1,54 @@
+/* Copyright (c) 2011, 2013, 2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __LINUX_USB_DIAG_BRIDGE_H__
+#define __LINUX_USB_DIAG_BRIDGE_H__
+
+struct diag_bridge_ops {
+	void *ctxt;
+	void (*read_complete_cb)(void *ctxt, char *buf,
+			int buf_size, int actual);
+	void (*write_complete_cb)(void *ctxt, char *buf,
+			int buf_size, int actual);
+	int (*suspend)(void *ctxt);
+	void (*resume)(void *ctxt);
+};
+
+#if IS_ENABLED(CONFIG_USB_QCOM_DIAG_BRIDGE)
+
+extern int diag_bridge_read(int id, char *data, int size);
+extern int diag_bridge_write(int id, char *data, int size);
+extern int diag_bridge_open(int id, struct diag_bridge_ops *ops);
+extern void diag_bridge_close(int id);
+
+#else
+
+static int __maybe_unused diag_bridge_read(int id, char *data, int size)
+{
+	return -ENODEV;
+}
+
+static int __maybe_unused diag_bridge_write(int id, char *data, int size)
+{
+	return -ENODEV;
+}
+
+static int __maybe_unused diag_bridge_open(int id, struct diag_bridge_ops *ops)
+{
+	return -ENODEV;
+}
+
+static void __maybe_unused diag_bridge_close(int id) { }
+
+#endif
+
+#endif