Staging: add cpc-usb driver to the staging tree

This is a CPC CAN USB driver.

Just some comments:
cpcusb.h and cpc-usb_drv.c: Essential driver source code
sja2m16c_2.c: Helper for converting bitrate timings
cpc.h: Structures and definition needed to communicate with the device

From: Sebastian Haas <haas@ems-wuensche.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/cpc-usb/cpc_int.h

+/*
+ * CPCLIB
+ *
+ * Copyright (C) 2000-2008 EMS Dr. Thomas Wuensche
+ *
+ * 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.
+ *
+ */
+#ifndef CPC_INT_H
+#define CPC_INT_H
+
+#include <linux/wait.h>
+
+#define CPC_MSG_BUF_CNT	1500
+
+#ifdef CONFIG_PROC_FS
+#   define CPC_PROC_DIR "driver/"
+#endif
+
+#undef dbg
+#undef err
+#undef info
+
+/* Use our own dbg macro */
+#define dbg(format, arg...) do { if (debug) printk( KERN_INFO format "\n" , ## arg); } while (0)
+#define err(format, arg...) do { printk( KERN_INFO "ERROR " format "\n" , ## arg); } while (0)
+#define info(format, arg...) do { printk( KERN_INFO format "\n" , ## arg); } while (0)
+
+/* Macros help using of our buffers */
+#define IsBufferFull(x)     (!(x)->WnR) && ((x)->iidx == (x)->oidx)
+#define IsBufferEmpty(x)    ((x)->WnR) && ((x)->iidx == (x)->oidx)
+#define IsBufferNotEmpty(x) (!(x)->WnR) || ((x)->iidx != (x)->oidx)
+#define ResetBuffer(x)      do { (x)->oidx = (x)->iidx=0; (x)->WnR = 1; } while(0);
+
+#define CPC_BufWriteAllowed ((chan->oidx != chan->iidx) || chan->WnR)
+
+typedef void (*chan_write_byte_t) (void *chan, unsigned int reg,
+				   unsigned char val);
+typedef unsigned char (*chan_read_byte_t) (void *chan, unsigned int reg);
+
+typedef struct CPC_CHAN {
+	void __iomem * canBase;	// base address of SJA1000
+	chan_read_byte_t read_byte;	// CAN controller read access routine
+	chan_write_byte_t write_byte;	// CAN controller write access routine
+	CPC_MSG_T *buf;		// buffer for CPC msg
+	unsigned int iidx;
+	unsigned int oidx;
+	unsigned int WnR;
+	unsigned int minor;
+	unsigned int locked;
+	unsigned int irqDisabled;
+
+	unsigned char cpcCtrlCANMessage;
+	unsigned char cpcCtrlCANState;
+	unsigned char cpcCtrlBUSState;
+
+	unsigned char controllerType;
+
+	unsigned long ovrTimeSec;
+	unsigned long ovrTimeNSec;
+	unsigned long ovrLockedBuffer;
+	CPC_OVERRUN_T ovr;
+
+	/* for debugging only */
+	unsigned int handledIrqs;
+	unsigned int lostMessages;
+
+	unsigned int sentStdCan;
+	unsigned int sentExtCan;
+	unsigned int sentStdRtr;
+	unsigned int sentExtRtr;
+
+	unsigned int recvStdCan;
+	unsigned int recvExtCan;
+	unsigned int recvStdRtr;
+	unsigned int recvExtRtr;
+
+	wait_queue_head_t *CPCWait_q;
+
+	void *private;
+} CPC_CHAN_T;
+
+#endif

drivers/staging/cpc-usb/cpcusb.h

+/* Header for CPC-USB Driver ********************
+ * Copyright 1999, 2000, 2001
+ *
+ * Company:  EMS Dr. Thomas Wuensche
+ *           Sonnenhang 3
+ *           85304 Ilmmuenster
+ *           Phone: +49-8441-490260
+ *           Fax:   +49-8441-81860
+ *           email: support@ems-wuensche.com
+ *           WWW:   www.ems-wuensche.com
+ */
+
+#ifndef CPCUSB_H
+#define CPCUSB_H
+
+#undef err
+#undef dbg
+#undef info
+
+/* Use our own dbg macro */
+#define dbg(format, arg...) do { if (debug) printk(KERN_INFO "CPC-USB: " format "\n" , ## arg); } while (0)
+#define info(format, arg...) do { printk(KERN_INFO "CPC-USB: " format "\n" , ## arg); } while (0)
+#define err(format, arg...) do { printk(KERN_INFO "CPC-USB(ERROR): " format "\n" , ## arg); } while (0)
+
+#define CPC_USB_CARD_CNT      4
+
+typedef struct CPC_USB_READ_URB {
+	unsigned char *buffer;	/* the buffer to send data */
+	size_t size;		/* the size of the send buffer */
+	struct urb *urb;	/* the urb used to send data */
+} CPC_USB_READ_URB_T;
+
+typedef struct CPC_USB_WRITE_URB {
+	unsigned char *buffer;	/* the buffer to send data */
+	size_t size;		/* the size of the send buffer */
+	struct urb *urb;	/* the urb used to send data */
+	atomic_t busy;		/* true if write urb is busy */
+	struct completion finished;	/* wait for the write to finish */
+} CPC_USB_WRITE_URB_T;
+
+#define CPC_USB_URB_CNT  10
+
+typedef struct CPC_USB {
+	struct usb_device *udev;	/* save off the usb device pointer */
+	struct usb_interface *interface;	/* the interface for this device */
+	unsigned char minor;	/* the starting minor number for this device */
+	unsigned char num_ports;	/* the number of ports this device has */
+	int num_intr_in;	/* number of interrupt in endpoints we have */
+	int num_bulk_in;	/* number of bulk in endpoints we have */
+	int num_bulk_out;	/* number of bulk out endpoints we have */
+
+	CPC_USB_READ_URB_T urbs[CPC_USB_URB_CNT];
+
+	unsigned char intr_in_buffer[4];	/* interrupt transfer buffer */
+	struct urb *intr_in_urb;	/* interrupt transfer urb */
+
+	CPC_USB_WRITE_URB_T wrUrbs[CPC_USB_URB_CNT];
+
+	int open;		/* if the port is open or not */
+	int present;		/* if the device is not disconnected */
+	struct semaphore sem;	/* locks this structure */
+
+	int free_slots;		/* free send slots of CPC-USB */
+	int idx;
+
+	spinlock_t slock;
+
+	char serialNumber[128];	/* serial number */
+	int productId;		/* product id to differ between M16C and LPC2119 */
+	CPC_CHAN_T *chan;
+} CPC_USB_T;
+
+#define CPCTable               CPCUSB_Table
+
+#define CPC_DRIVER_VERSION "0.724"
+#define CPC_DRIVER_SERIAL  "not applicable"
+
+#define OBUF_SIZE 255		// 4096
+
+/* read timeouts -- RD_NAK_TIMEOUT * RD_EXPIRE = Number of seconds */
+#define RD_NAK_TIMEOUT (10*HZ)	/* Default number of X seconds to wait */
+#define RD_EXPIRE 12		/* Number of attempts to wait X seconds */
+
+#define CPC_USB_BASE_MNR 0	/* CPC-USB start at minor 0  */
+
+#endif

drivers/staging/cpc-usb/sja2m16c.h

+#ifndef SJA2M16C_H
+#define SJA2M16C_H
+
+#include "cpc.h"
+
+#define BAUDRATE_TOLERANCE_PERCENT      1
+#define SAMPLEPOINT_TOLERANCE_PERCENT   5
+#define SAMPLEPOINT_UPPER_LIMIT        88
+
+// M16C parameters
+    typedef struct FIELD_C0CONR {
+	unsigned int brp:4;
+	 unsigned int sam:1;
+	 unsigned int pr:3;
+	 unsigned int dummy:8;
+} FIELD_C0CONR_T;
+typedef struct FIELD_C1CONR {
+	unsigned int ph1:3;
+	 unsigned int ph2:3;
+	 unsigned int sjw:2;
+	 unsigned int dummy:8;
+} FIELD_C1CONR_T;
+typedef union C0CONR {
+	unsigned char c0con;
+	 FIELD_C0CONR_T bc0con;
+} C0CONR_T;
+typedef union C1CONR {
+	unsigned char c1con;
+	 FIELD_C1CONR_T bc1con;
+} C1CONR_T;
+
+#define SJA_TSEG1  ((pParams->btr1 & 0x0f)+1)
+#define SJA_TSEG2  (((pParams->btr1 & 0x70)>>4)+1)
+#define SJA_BRP    ((pParams->btr0 & 0x3f)+1)
+#define SJA_SJW    ((pParams->btr0 & 0xc0)>>6)
+#define SJA_SAM    ((pParams->btr1 & 0x80)>>7)
+int baudrate_m16c(int clk, int brp, int pr, int ph1, int ph2);
+int samplepoint_m16c(int brp, int pr, int ph1, int ph2);
+int SJA1000_TO_M16C_BASIC_Params(CPC_MSG_T * pMsg);
+
+#endif	/*  */