net: usb: Add MUX support in embedded rmnet driver
Due to limited number of HSIC endpoints, to support
more than existing number of control and data channels,
driver needs to MUX all the data channels as well as
the control channels into one HSIC interface. MUX
support is enabled on PID 0x9075. MUX header is added
to IP/control packet based on the channel id while
transmitting to mdm device. Similarly, while receiving
driver removes and parses the MUX header and based on
channel id it forwards IP/control packet to appropriate
network interface/control channel.
Change-Id: If37c672347ab47be6e02d4efd33a70c46486b5f1
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
diff --git a/drivers/net/usb/rmnet_usb.h b/drivers/net/usb/rmnet_usb.h
new file mode 100644
index 0000000..b895969
--- /dev/null
+++ b/drivers/net/usb/rmnet_usb.h
@@ -0,0 +1,118 @@
+/* Copyright (c) 2011-2013, 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 __RMNET_USB_H
+#define __RMNET_USB_H
+
+#include <linux/mutex.h>
+#include <linux/usb.h>
+#include <linux/cdev.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/cdc.h>
+
+#define MAX_RMNET_DEVS 4
+#define MAX_RMNET_INSTS_PER_DEV 17
+#define TOTAL_RMNET_DEV_COUNT (MAX_RMNET_DEVS * MAX_RMNET_INSTS_PER_DEV)
+
+#define CTRL_DEV_MAX_LEN 10
+
+#define RMNET_CTRL_DEV_OPEN 0
+#define RMNET_CTRL_DEV_READY 1
+#define RMNET_CTRL_DEV_MUX_EN 2
+
+/*MUX header bit masks*/
+#define MUX_CTRL_MASK 0x1
+#define MUX_PAD_SHIFT 0x2
+
+/*max padding bytes for n byte alignment*/
+#define MAX_PAD_BYTES(n) (n-1)
+
+/*
+ *MUX Header Format
+ *BIT 0 : Mux type 0: Data, 1: control
+ *BIT 1: Reserved
+ *BIT 2-7: Pad bytes
+ *BIT 8-15: Mux ID
+ *BIT 16-31: PACKET_LEN_WITH_PADDING (Bytes)
+ */
+struct mux_hdr {
+ __u8 padding_info;
+ __u8 mux_id;
+ __le16 pkt_len_w_padding;
+} __packed;
+
+struct rmnet_ctrl_dev {
+
+ /*for debugging purpose*/
+ char name[CTRL_DEV_MAX_LEN];
+
+ struct cdev cdev;
+ struct device *devicep;
+ unsigned ch_id;
+
+ /*to identify the usb device*/
+ unsigned id;
+
+ struct usb_interface *intf;
+ unsigned int int_pipe;
+ struct urb *rcvurb;
+ struct urb *inturb;
+ struct usb_anchor tx_submitted;
+ struct usb_anchor rx_submitted;
+ void *rcvbuf;
+ void *intbuf;
+ struct usb_ctrlrequest *in_ctlreq;
+
+ spinlock_t rx_lock;
+ struct mutex dev_lock;
+ struct list_head rx_list;
+ wait_queue_head_t read_wait_queue;
+ wait_queue_head_t open_wait_queue;
+
+ struct workqueue_struct *wq;
+ struct work_struct get_encap_work;
+
+ unsigned long status;
+
+ bool claimed;
+
+ unsigned int mdm_wait_timeout;
+
+ /*input control lines (DSR, CTS, CD, RI)*/
+ unsigned int cbits_tolocal;
+ /*output control lines (DTR, RTS)*/
+ unsigned int cbits_tomdm;
+
+ /*counters*/
+ unsigned int snd_encap_cmd_cnt;
+ unsigned int get_encap_resp_cnt;
+ unsigned int resp_avail_cnt;
+ unsigned int get_encap_failure_cnt;
+ unsigned int set_ctrl_line_state_cnt;
+ unsigned int tx_ctrl_err_cnt;
+ unsigned int zlp_cnt;
+};
+
+extern struct workqueue_struct *usbnet_wq;
+
+extern int rmnet_usb_ctrl_start_rx(struct rmnet_ctrl_dev *);
+extern int rmnet_usb_ctrl_suspend(struct rmnet_ctrl_dev *dev);
+extern int rmnet_usb_ctrl_init(int num_devs, int insts_per_dev);
+extern void rmnet_usb_ctrl_exit(int num_devs, int insts_per_dev);
+extern int rmnet_usb_ctrl_probe(struct usb_interface *intf,
+ struct usb_host_endpoint *int_in,
+ unsigned long rmnet_devnum,
+ unsigned long *data);
+extern void rmnet_usb_ctrl_disconnect(struct rmnet_ctrl_dev *);
+extern void rmnet_usb_ctrl_cleanup(struct rmnet_ctrl_dev *dev);
+
+#endif /* __RMNET_USB_H*/