usb: Add network bridge host driver for dun and rmnet
This host driver will be used to communicate with modem devices
with dial up network and RMNET interfaces. This driver works as
a bridge to pass control and data packets between the modem and
peripheral usb gadget driver. Driver currently supports
modem devices (vendor ID 0x05c6) with PIDs 0x9001
Change-Id: Id85b552b39d061528a1c3c90a354d73580c9b631
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
diff --git a/arch/arm/mach-msm/include/mach/usb_bridge.h b/arch/arm/mach-msm/include/mach/usb_bridge.h
new file mode 100644
index 0000000..2b7e754
--- /dev/null
+++ b/arch/arm/mach-msm/include/mach/usb_bridge.h
@@ -0,0 +1,122 @@
+/* Copyright (c) 2011, Code Aurora Forum. 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_BRIDGE_H__
+#define __LINUX_USB_BRIDGE_H__
+
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+/* bridge device 0: DUN
+ * bridge device 1 : Tethered RMNET
+ */
+#define MAX_BRIDGE_DEVICES 2
+
+/*PID 9001*/
+#define DUN_IFACE_NUM 2
+#define TETHERED_RMNET_IFACE_NUM 3
+
+struct bridge_ops {
+ int (*send_pkt)(void *, void *, size_t actual);
+ void (*send_cbits)(void *, unsigned int);
+
+ /* flow control */
+ void (*unthrottle_tx)(void *);
+};
+
+#define TX_THROTTLED BIT(0)
+#define RX_THROTTLED BIT(1)
+
+struct bridge {
+ /* context of the gadget port using bridge driver */
+ void *ctx;
+
+ /* bridge device array index mapped to the gadget port array index.
+ * data bridge[ch_id] <-- bridge --> gadget port[ch_id]
+ */
+ unsigned int ch_id;
+
+ /* flow control bits */
+ unsigned long flags;
+
+ /* data/ctrl bridge callbacks */
+ struct bridge_ops ops;
+};
+
+#if defined(CONFIG_USB_QCOM_MDM_BRIDGE) || \
+ defined(CONFIG_USB_QCOM_MDM_BRIDGE_MODULE)
+
+/* Bridge APIs called by gadget driver */
+int ctrl_bridge_open(struct bridge *);
+void ctrl_bridge_close(unsigned int);
+int ctrl_bridge_write(unsigned int, char *, size_t);
+int ctrl_bridge_set_cbits(unsigned int, unsigned int);
+unsigned int ctrl_bridge_get_cbits_tohost(unsigned int);
+int data_bridge_open(struct bridge *brdg);
+void data_bridge_close(unsigned int);
+int data_bridge_write(unsigned int , struct sk_buff *);
+int data_bridge_unthrottle_rx(unsigned int);
+
+/* defined in control bridge */
+int ctrl_bridge_probe(struct usb_interface *, struct usb_host_endpoint *, int);
+void ctrl_bridge_disconnect(unsigned int);
+int ctrl_bridge_resume(unsigned int);
+int ctrl_bridge_suspend(unsigned int);
+
+#else
+
+static inline int __maybe_unused ctrl_bridge_open(struct bridge *brdg)
+{
+ return -ENODEV;
+}
+
+static inline void __maybe_unused ctrl_bridge_close(unsigned int id) { }
+
+static inline int __maybe_unused ctrl_bridge_write(unsigned int id,
+ char *data, size_t size)
+{
+ return -ENODEV;
+}
+
+static inline int __maybe_unused ctrl_bridge_set_cbits(unsigned int id,
+ unsigned int cbits)
+{
+ return -ENODEV;
+}
+
+static inline unsigned int __maybe_unused
+ctrl_bridge_get_cbits_tohost(unsigned int id)
+{
+ return -ENODEV;
+}
+
+static inline int __maybe_unused data_bridge_open(struct bridge *brdg)
+{
+ return -ENODEV;
+}
+
+static inline void __maybe_unused data_bridge_close(unsigned int id) { }
+
+static inline int __maybe_unused data_bridge_write(unsigned int id,
+ struct sk_buff *skb)
+{
+ return -ENODEV;
+}
+
+static inline int __maybe_unused data_bridge_unthrottle_rx(unsigned int id)
+{
+ return -ENODEV;
+}
+
+#endif
+#endif
diff --git a/arch/arm/mach-msm/include/mach/usb_dun_bridge.h b/arch/arm/mach-msm/include/mach/usb_dun_bridge.h
deleted file mode 100644
index b4a8eef..0000000
--- a/arch/arm/mach-msm/include/mach/usb_dun_bridge.h
+++ /dev/null
@@ -1,113 +0,0 @@
-/* Copyright (c) 2011, Code Aurora Forum. 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 __USB_DUN_BRIDGE_H
-#define __USB_DUN_BRIDGE_H
-
-/**
- * struct dun_bridge_ops - context and callbacks for DUN bridge
- *
- * @ctxt: caller private context
- * @read_complete: called when read is completed. buf and len correspond
- * to original passed-in values. actual length of buffer returned, or
- * negative error value.
- * @write_complete: called when write is completed. buf and len correspond
- * to original passed-in values. actual length of buffer returned, or
- * negative error value.
- * @ctrl_status: asynchronous notification of control status. ctrl_bits
- * is a bitfield of CDC ACM control status bits.
- */
-struct dun_bridge_ops {
- void *ctxt;
- void (*read_complete)(void *ctxt, char *buf, size_t len, size_t actual);
- void (*write_complete)(void *ctxt, char *buf,
- size_t len, size_t actual);
- void (*ctrl_status)(void *ctxt, unsigned int ctrl_bits);
-};
-
-#ifdef CONFIG_USB_QCOM_DUN_BRIDGE
-
-/**
- * dun_bridge_open - Open the DUN bridge
- *
- * @ops: pointer to ops struct containing private context and callback
- * pointers
- */
-int dun_bridge_open(struct dun_bridge_ops *ops);
-
-/**
- * dun_bridge_close - Closes the DUN bridge
- */
-int dun_bridge_close(void);
-
-/**
- * dun_bridge_read - Request to read data from the DUN bridge. This call is
- * asynchronous: user's read callback (ops->read_complete) will be called
- * when data is returned.
- *
- * @data: pointer to caller-allocated buffer to fill in
- * @len: size of the buffer
- */
-int dun_bridge_read(void *data, int len);
-
-/**
- * dun_bridge_write - Request to write data to the DUN bridge. This call is
- * asynchronous: user's write callback (ops->write_complete) will be called
- * upon completion of the write indicating status and number of bytes
- * written.
- *
- * @data: pointer to caller-allocated buffer to write
- * @len: length of the data in buffer
- */
-int dun_bridge_write(void *data, int len);
-
-/**
- * dun_bridge_send_ctrl_bits - Request to write line control data to the DUN
- * bridge. This call is asynchronous, however no callback will be issued
- * upon completion.
- *
- * @ctrl_bits: CDC ACM line control bits
- */
-int dun_bridge_send_ctrl_bits(unsigned ctrl_bits);
-
-#else
-
-#include <linux/errno.h>
-
-static int __maybe_unused dun_bridge_open(struct dun_bridge_ops *ops)
-{
- return -ENODEV;
-}
-
-static int __maybe_unused dun_bridge_close(void)
-{
- return -ENODEV;
-}
-
-static int __maybe_unused dun_bridge_read(void *data, int len)
-{
- return -ENODEV;
-}
-
-static int __maybe_unused dun_bridge_write(void *data, int len)
-{
- return -ENODEV;
-}
-
-static int __maybe_unused dun_bridge_send_ctrl_bits(unsigned ctrl_bits)
-{
- return -ENODEV;
-}
-
-#endif
-
-#endif