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: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/cpc-usb/cpc.h

+/*
+ * CPC CAN Interface Definitions
+ *
+ * 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_HEADER
+#define CPC_HEADER
+
+// the maximum length of the union members within a CPC_MSG
+// this value can be defined by the customer, but has to be
+// >= 64 bytes
+// however, if not defined before, we set a length of 64 byte
+#if !defined(CPC_MSG_LEN) || (CPC_MSG_LEN < 64)
+#undef CPC_MSG_LEN
+#define CPC_MSG_LEN 64
+#endif
+
+// check the operating system used
+#ifdef _WIN32 // running a Windows OS
+
+// define basic types on Windows platforms
+#ifdef _MSC_VER // Visual Studio
+	typedef unsigned __int8 u8;
+	typedef unsigned __int16 u16;
+	typedef unsigned __int32 u32;
+#else // Borland Compiler
+	typedef unsigned char u8;
+	typedef unsigned short u16;
+	typedef unsigned int u32;
+#endif
+	// on Windows OS we use a byte alignment of 1
+	#pragma pack(push, 1)
+
+	// set the calling conventions for the library function calls
+	#define CALL_CONV __stdcall
+#else
+	// Kernel headers already define this types
+	#ifndef __KERNEL__
+		// define basic types
+		typedef unsigned char u8;
+		typedef unsigned short u16;
+		typedef unsigned int u32;
+	#endif
+
+	// Linux does not use this calling convention
+	#define CALL_CONV
+#endif
+
+// Transmission of events from CPC interfaces to PC can be individually
+// controlled per event type. Default state is: don't transmit
+// Control values are constructed by bit-or of Subject and Action
+// and passed to CPC_Control()
+
+// Control-Values for CPC_Control() Command Subject Selection
+#define CONTR_CAN_Message 0x04
+#define CONTR_Busload	  0x08
+#define	CONTR_CAN_State	  0x0C
+#define	CONTR_SendAck	  0x10
+#define	CONTR_Filter	  0x14
+#define CONTR_CmdQueue    0x18	// reserved, do not use
+#define CONTR_BusError    0x1C
+
+// Control Command Actions
+#define CONTR_CONT_OFF    0
+#define CONTR_CONT_ON     1
+#define CONTR_SING_ON     2
+// CONTR_SING_ON doesn't change CONTR_CONT_ON state, so it should be
+// read as: transmit at least once
+
+// defines for confirmed request
+#define DO_NOT_CONFIRM 0
+#define DO_CONFIRM     1
+
+// event flags
+#define EVENT_READ 0x01
+#define EVENT_WRITE 0x02
+
+// Messages from CPC to PC contain a message object type field.
+// The following message types are sent by CPC and can be used in
+// handlers, others should be ignored.
+#define CPC_MSG_T_RESYNC        0 // Normally to be ignored
+#define CPC_MSG_T_CAN           1 // CAN data frame
+#define CPC_MSG_T_BUSLOAD       2 // Busload message
+#define CPC_MSG_T_STRING        3 // Normally to be ignored
+#define CPC_MSG_T_CONTI         4 // Normally to be ignored
+#define CPC_MSG_T_MEM           7 // Normally not to be handled
+#define	CPC_MSG_T_RTR           8 // CAN remote frame
+#define CPC_MSG_T_TXACK	        9 // Send acknowledge
+#define CPC_MSG_T_POWERUP      10 // Power-up message
+#define	CPC_MSG_T_CMD_NO       11 // Normally to be ignored
+#define	CPC_MSG_T_CAN_PRMS     12 // Actual CAN parameters
+#define	CPC_MSG_T_ABORTED      13 // Command aborted message
+#define	CPC_MSG_T_CANSTATE     14 // CAN state message
+#define CPC_MSG_T_RESET        15 // used to reset CAN-Controller
+#define	CPC_MSG_T_XCAN         16 // XCAN data frame
+#define CPC_MSG_T_XRTR         17 // XCAN remote frame
+#define CPC_MSG_T_INFO         18 // information strings
+#define CPC_MSG_T_CONTROL      19 // used for control of interface/driver behaviour
+#define CPC_MSG_T_CONFIRM      20 // response type for confirmed requests
+#define CPC_MSG_T_OVERRUN      21 // response type for overrun conditions
+#define CPC_MSG_T_KEEPALIVE    22 // response type for keep alive conditions
+#define CPC_MSG_T_CANERROR     23 // response type for bus error conditions
+#define CPC_MSG_T_DISCONNECTED 24 // response type for a disconnected interface
+#define CPC_MSG_T_ERR_COUNTER  25 // RX/TX error counter of CAN controller
+
+#define CPC_MSG_T_FIRMWARE    100 // response type for USB firmware download
+
+// Messages from the PC to the CPC interface contain a command field
+// Most of the command types are wrapped by the library functions and have therefore
+// normally not to be used.
+// However, programmers who wish to circumvent the library and talk directly
+// to the drivers (mainly Linux programmers) can use the following
+// command types:
+
+#define CPC_CMD_T_CAN                 1	// CAN data frame
+#define CPC_CMD_T_CONTROL             3	// used for control of interface/driver behaviour
+#define	CPC_CMD_T_CAN_PRMS            6	// set CAN parameters
+#define	CPC_CMD_T_CLEARBUF            8	// clears input queue; this is depricated, use CPC_CMD_T_CLEAR_MSG_QUEUE instead
+#define	CPC_CMD_T_INQ_CAN_PARMS      11	// inquire actual CAN parameters
+#define	CPC_CMD_T_FILTER_PRMS        12	// set filter parameter
+#define	CPC_CMD_T_RTR                13	// CAN remote frame
+#define	CPC_CMD_T_CANSTATE           14	// CAN state message
+#define	CPC_CMD_T_XCAN               15	// XCAN data frame
+#define CPC_CMD_T_XRTR               16	// XCAN remote frame
+#define CPC_CMD_T_RESET              17	// used to reset CAN-Controller
+#define CPC_CMD_T_INQ_INFO           18	// miscellanous information strings
+#define CPC_CMD_T_OPEN_CHAN          19	// open a channel
+#define CPC_CMD_T_CLOSE_CHAN         20	// close a channel
+#define CPC_CMD_T_CNTBUF             21	// this is depricated, use CPC_CMD_T_INQ_MSG_QUEUE_CNT instead
+#define CPC_CMD_T_CAN_EXIT          200 // exit the CAN (disable interrupts; reset bootrate; reset output_cntr; mode = 1)
+
+#define CPC_CMD_T_INQ_MSG_QUEUE_CNT  CPC_CMD_T_CNTBUF   // inquires the count of elements in the message queue
+#define CPC_CMD_T_INQ_ERR_COUNTER    25	                // request the CAN controllers error counter
+#define	CPC_CMD_T_CLEAR_MSG_QUEUE    CPC_CMD_T_CLEARBUF // clear CPC_MSG queue
+#define	CPC_CMD_T_CLEAR_CMD_QUEUE    28	                // clear CPC_CMD queue
+#define CPC_CMD_T_FIRMWARE          100                 // reserved, must not be used
+#define CPC_CMD_T_USB_RESET         101                 // reserved, must not be used
+#define CPC_CMD_T_WAIT_NOTIFY       102                 // reserved, must not be used
+#define CPC_CMD_T_WAIT_SETUP        103                 // reserved, must not be used
+#define	CPC_CMD_T_ABORT             255                 // Normally not to be used
+
+// definitions for CPC_MSG_T_INFO
+// information sources
+#define CPC_INFOMSG_T_UNKNOWN_SOURCE 0
+#define CPC_INFOMSG_T_INTERFACE      1
+#define CPC_INFOMSG_T_DRIVER         2
+#define CPC_INFOMSG_T_LIBRARY        3
+
+// information types
+#define CPC_INFOMSG_T_UNKNOWN_TYPE   0
+#define CPC_INFOMSG_T_VERSION        1
+#define CPC_INFOMSG_T_SERIAL         2
+
+// definitions for controller types
+#define PCA82C200   1 // Philips basic CAN controller, replaced by SJA1000
+#define SJA1000     2 // Philips basic CAN controller
+#define AN82527     3 // Intel full CAN controller
+#define M16C_BASIC  4 // M16C controller running in basic CAN (not full CAN) mode
+
+// channel open error codes
+#define CPC_ERR_NO_FREE_CHANNEL            -1	// no more free space within the channel array
+#define CPC_ERR_CHANNEL_ALREADY_OPEN       -2	// the channel is already open
+#define CPC_ERR_CHANNEL_NOT_ACTIVE         -3	// access to a channel not active failed
+#define CPC_ERR_NO_DRIVER_PRESENT          -4	// no driver at the location searched by the library
+#define CPC_ERR_NO_INIFILE_PRESENT         -5	// the library could not find the inifile
+#define CPC_ERR_WRONG_PARAMETERS           -6	// wrong parameters in the inifile
+#define CPC_ERR_NO_INTERFACE_PRESENT       -7	// 1. The specified interface is not connected
+						// 2. The interface (mostly CPC-USB) was disconnected upon operation
+#define CPC_ERR_NO_MATCHING_CHANNEL        -8	// the driver couldn't find a matching channel
+#define CPC_ERR_NO_BUFFER_AVAILABLE        -9	// the driver couldn't allocate buffer for messages
+#define CPC_ERR_NO_INTERRUPT               -10	// the requested interrupt couldn't be claimed
+#define CPC_ERR_NO_MATCHING_INTERFACE      -11	// no interface type related to this channel was found
+#define CPC_ERR_NO_RESOURCES               -12	// the requested resources could not be claimed
+#define CPC_ERR_SOCKET                     -13	// error concerning TCP sockets
+
+// init error codes
+#define CPC_ERR_WRONG_CONTROLLER_TYPE      -14	// wrong CAN controller type within initialization
+#define CPC_ERR_NO_RESET_MODE              -15	// the controller could not be set into reset mode
+#define CPC_ERR_NO_CAN_ACCESS              -16	// the CAN controller could not be accessed
+
+// transmit error codes
+#define CPC_ERR_CAN_WRONG_ID               -20	// the provided CAN id is too big
+#define CPC_ERR_CAN_WRONG_LENGTH           -21	// the provided CAN length is too long
+#define CPC_ERR_CAN_NO_TRANSMIT_BUF        -22	// the transmit buffer was occupied
+#define CPC_ERR_CAN_TRANSMIT_TIMEOUT       -23	// The message could not be sent within a
+						// specified time
+
+// other error codes
+#define CPC_ERR_SERVICE_NOT_SUPPORTED      -30	// the requested service is not supported by the interface
+#define CPC_ERR_IO_TRANSFER                -31	// a transmission error down to the driver occurred
+#define CPC_ERR_TRANSMISSION_FAILED        -32	// a transmission error down to the interface occurred
+#define CPC_ERR_TRANSMISSION_TIMEOUT       -33	// a timeout occurred within transmission to the interface
+#define CPC_ERR_OP_SYS_NOT_SUPPORTED       -35	// the operating system is not supported
+#define CPC_ERR_UNKNOWN                    -40	// an unknown error ocurred (mostly IOCTL errors)
+
+#define CPC_ERR_LOADING_DLL                -50	// the library 'cpcwin.dll' could not be loaded
+#define CPC_ERR_ASSIGNING_FUNCTION         -51	// the specified function could not be assigned
+#define CPC_ERR_DLL_INITIALIZATION         -52	// the DLL was not initialized correctly
+#define CPC_ERR_MISSING_LICFILE            -55	// the file containing the licenses does not exist
+#define CPC_ERR_MISSING_LICENSE            -56	// a required license was not found
+
+// CAN state bit values. Ignore any bits not listed
+#define CPC_CAN_STATE_BUSOFF     0x80
+#define CPC_CAN_STATE_ERROR      0x40
+
+// Mask to help ignore undefined bits
+#define CPC_CAN_STATE_MASK       0xc0
+
+// CAN-Message representation in a CPC_MSG
+// Message object type is CPC_MSG_T_CAN or CPC_MSG_T_RTR
+// or CPC_MSG_T_XCAN or CPC_MSG_T_XRTR
+typedef struct CPC_CAN_MSG {
+	u32 id;
+	u8 length;
+	u8 msg[8];
+} CPC_CAN_MSG_T;
+
+
+// representation of the CAN parameters for the PCA82C200 controller
+typedef struct CPC_PCA82C200_PARAMS {
+	u8 acc_code;	// Acceptance-code for receive, Standard: 0
+	u8 acc_mask;	// Acceptance-mask for receive, Standard: 0xff (everything)
+	u8 btr0;	// Bus-timing register 0
+	u8 btr1;	// Bus-timing register 1
+	u8 outp_contr;	// Output-control register
+} CPC_PCA82C200_PARAMS_T;
+
+// representation of the CAN parameters for the SJA1000 controller
+typedef struct CPC_SJA1000_PARAMS {
+	u8 mode;	// enables single or dual acceptance filtering
+	u8 acc_code0;	// Acceptance-code for receive, Standard: 0
+	u8 acc_code1;
+	u8 acc_code2;
+	u8 acc_code3;
+	u8 acc_mask0;	// Acceptance-mask for receive, Standard: 0xff (everything)
+	u8 acc_mask1;
+	u8 acc_mask2;
+	u8 acc_mask3;
+	u8 btr0;	// Bus-timing register 0
+	u8 btr1;	// Bus-timing register 1
+	u8 outp_contr;	// Output-control register
+} CPC_SJA1000_PARAMS_T;
+
+// representation of the CAN parameters for the M16C controller
+// in basic CAN mode (means no full CAN)
+typedef struct CPC_M16C_BASIC_PARAMS {
+	u8 con0;
+	u8 con1;
+	u8 ctlr0;
+	u8 ctlr1;
+	u8 clk;
+	u8 acc_std_code0;
+	u8 acc_std_code1;
+	u8 acc_ext_code0;
+	u8 acc_ext_code1;
+	u8 acc_ext_code2;
+	u8 acc_ext_code3;
+	u8 acc_std_mask0;
+	u8 acc_std_mask1;
+	u8 acc_ext_mask0;
+	u8 acc_ext_mask1;
+	u8 acc_ext_mask2;
+	u8 acc_ext_mask3;
+} CPC_M16C_BASIC_PARAMS_T;
+
+// CAN params message representation
+typedef struct CPC_CAN_PARAMS {
+	u8 cc_type;	// represents the controller type
+	union {
+		CPC_M16C_BASIC_PARAMS_T m16c_basic;
+		CPC_SJA1000_PARAMS_T sja1000;
+		CPC_PCA82C200_PARAMS_T pca82c200;
+	} cc_params;
+} CPC_CAN_PARAMS_T;
+
+// the following structures are slightly different for Windows and Linux
+// To be able to use the 'Select' mechanism with Linux the application
+// needs to know the devices file desciptor.
+// This mechanism is not implemented within Windows and the file descriptor
+// is therefore not needed
+#ifdef _WIN32
+
+// CAN init params message representation
+typedef struct CPC_INIT_PARAMS {
+	CPC_CAN_PARAMS_T canparams;
+} CPC_INIT_PARAMS_T;
+
+#else// Linux
+
+// CHAN init params representation
+typedef struct CPC_CHAN_PARAMS {
+	int fd;
+} CPC_CHAN_PARAMS_T;
+
+// CAN init params message representation
+typedef struct CPC_INIT_PARAMS {
+	CPC_CHAN_PARAMS_T chanparams;
+	CPC_CAN_PARAMS_T canparams;
+} CPC_INIT_PARAMS_T;
+
+#endif
+
+// structure for confirmed message handling
+typedef struct CPC_CONFIRM {
+	u8 result; // error code
+} CPC_CONFIRM_T;
+
+// structure for information requests
+typedef struct CPC_INFO {
+	u8 source;                 // interface, driver or library
+	u8 type;                   // version or serial number
+	char msg[CPC_MSG_LEN - 2]; // string holding the requested information
+} CPC_INFO_T;
+
+// OVERRUN ///////////////////////////////////////
+// In general two types of overrun may occur.
+// A hardware overrun, where the CAN controller
+// lost a message, because the interrupt was
+// not handled before the next messgae comes in.
+// Or a software overrun, where i.e. a received
+// message could not be stored in the CPC_MSG
+// buffer.
+
+// After a software overrun has occurred
+// we wait until we have CPC_OVR_GAP slots
+// free in the CPC_MSG buffer.
+#define CPC_OVR_GAP               10
+
+// Two types of software overrun may occur.
+// A received CAN message or a CAN state event
+// can cause an overrun.
+// Note: A CPC_CMD which would normally store
+// its result immediately in the CPC_MSG
+// queue may fail, because the message queue is full.
+// This will not generate an overrun message, but
+// will halt command execution, until this command
+// is able to store its message in the message queue.
+#define CPC_OVR_EVENT_CAN       0x01
+#define CPC_OVR_EVENT_CANSTATE  0x02
+#define CPC_OVR_EVENT_BUSERROR  0x04
+
+// If the CAN controller lost a message
+// we indicate it with the highest bit
+// set in the count field.
+#define CPC_OVR_HW              0x80
+
+// structure for overrun conditions
+typedef struct {
+	u8 event;
+	u8 count;
+} CPC_OVERRUN_T;
+
+// CAN errors ////////////////////////////////////
+// Each CAN controller type has different
+// registers to record errors.
+// Therefor a structure containing the specific
+// errors is set up for each controller here
+
+// SJA1000 error structure
+// see the SJA1000 datasheet for detailed
+// explanation of the registers
+typedef struct CPC_SJA1000_CAN_ERROR {
+	u8 ecc;   // error capture code register
+	u8 rxerr; // RX error counter register
+	u8 txerr; // TX error counter register
+} CPC_SJA1000_CAN_ERROR_T;
+
+// M16C error structure
+// see the M16C datasheet for detailed
+// explanation of the registers
+typedef struct CPC_M16C_CAN_ERROR {
+	u8 tbd;	// to be defined
+} CPC_M16C_CAN_ERROR_T;
+
+// structure for CAN error conditions
+#define  CPC_CAN_ECODE_ERRFRAME   0x01
+typedef struct CPC_CAN_ERROR {
+	u8 ecode;
+	struct {
+		u8 cc_type; // CAN controller type
+		union {
+			CPC_SJA1000_CAN_ERROR_T sja1000;
+			CPC_M16C_CAN_ERROR_T m16c;
+		} regs;
+	} cc;
+} CPC_CAN_ERROR_T;
+
+// Structure containing RX/TX error counter.
+// This structure is used to request the
+// values of the CAN controllers TX and RX
+// error counter.
+typedef struct CPC_CAN_ERR_COUNTER {
+	u8 rx;
+	u8 tx;
+} CPC_CAN_ERR_COUNTER_T;
+
+// If this flag is set, transmissions from PC to CPC are protected against loss
+#define CPC_SECURE_TO_CPC	0x01
+
+// If this flag is set, transmissions from CPC to PC are protected against loss
+#define CPC_SECURE_TO_PC	0x02
+
+// If this flag is set, the CAN-transmit buffer is checked to be free before sending a message
+#define CPC_SECURE_SEND		0x04
+
+// If this flag is set, the transmission complete flag is checked
+// after sending a message
+// THIS IS CURRENTLY ONLY IMPLEMENTED IN THE PASSIVE INTERFACE DRIVERS
+#define CPC_SECURE_TRANSMIT	0x08
+
+// main message type used between library and application
+typedef struct CPC_MSG {
+	u8 type;	// type of message
+	u8 length;	// length of data within union 'msg'
+	u8 msgid;	// confirmation handle
+	u32 ts_sec;	// timestamp in seconds
+	u32 ts_nsec;	// timestamp in nano seconds
+	union {
+		u8 generic[CPC_MSG_LEN];
+		CPC_CAN_MSG_T canmsg;
+		CPC_CAN_PARAMS_T canparams;
+		CPC_CONFIRM_T confirmation;
+		CPC_INFO_T info;
+		CPC_OVERRUN_T overrun;
+		CPC_CAN_ERROR_T error;
+		CPC_CAN_ERR_COUNTER_T err_counter;
+		u8 busload;
+		u8 canstate;
+	} msg;
+} CPC_MSG_T;
+
+#ifdef _WIN32
+#pragma pack(pop)		// reset the byte alignment
+#endif
+
+#endif				// CPC_HEADER

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	/*  */

drivers/staging/cpc-usb/sja2m16c_2.c

+/****************************************************************************
+*
+*      Copyright (c) 2003,2004 by EMS Dr. Thomas Wuensche
+*
+*                  - All rights reserved -
+*
+* This code is provided "as is" without warranty of any kind, either
+* expressed or implied, including but not limited to the liability
+* concerning the freedom from material defects, the fitness for parti-
+* cular purposes or the freedom of proprietary rights of third parties.
+*
+*****************************************************************************
+* Module name.: cpcusb
+*****************************************************************************
+* Include file: cpc.h
+*****************************************************************************
+* Project.....: Windows Driver Development Kit
+* Filename....: sja2m16c.cpp
+* Authors.....: (GU) Gerhard Uttenthaler
+*               (CS) Christian Schoett
+*****************************************************************************
+* Short descr.: converts baudrate between SJA1000 and M16C
+*****************************************************************************
+* Description.: handles the baudrate conversion from SJA1000 parameters to
+*               M16C parameters
+*****************************************************************************
+* Address     : EMS Dr. Thomas Wuensche
+*               Sonnenhang 3
+*               D-85304 Ilmmuenster
+*               Tel. : +49-8441-490260
+*               Fax. : +49-8441-81860
+*               email: support@ems-wuensche.com
+*****************************************************************************
+*                            History
+*****************************************************************************
+* Version  Date        Auth Remark
+*
+* 01.00    ??          GU   - initial release
+* 01.10    ??????????  CS   - adapted to fit into the USB Windows driver
+* 02.00    18.08.2004  GU   - improved the baudrate calculating algorithm
+*                           - implemented acceptance filtering
+* 02.10    10.09.2004  CS   - adapted to fit into the USB Windows driver
+*****************************************************************************
+*                            ToDo's
+*****************************************************************************
+*/
+
+/****************************************************************************/
+/*     I N C L U D E S
+*/
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/smp_lock.h>
+#include <linux/completion.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+
+#include "cpc.h"
+#include "cpc_int.h"
+#include "cpcusb.h"
+
+#include "sja2m16c.h"
+
+/*********************************************************************/
+int baudrate_m16c(int clk, int brp, int pr, int ph1, int ph2)
+{
+	return (16000000 / (1 << clk)) / 2 / (brp + 1) / (1 + pr + 1 +
+							    ph1 + 1 + ph2 +
+							    1);
+}
+
+
+/*********************************************************************/
+int samplepoint_m16c(int brp, int pr, int ph1, int ph2)
+{
+	return (100 * (1 + pr + 1 + ph1 + 1)) / (1 + pr + 1 + ph1 + 1 +
+						  ph2 + 1);
+}
+
+
+/****************************************************************************
+* Function.....: SJA1000_TO_M16C_BASIC_Params
+*
+* Task.........: This routine converts SJA1000 CAN btr parameters into M16C
+*                parameters based on the sample point and the error. In
+*                addition it converts the acceptance filter parameters to
+*                suit the M16C parameters
+*
+* Parameters...: None
+*
+* Return values: None
+*
+* Comments.....:
+*****************************************************************************
+*                History
+*****************************************************************************
+* 19.01.2005  CS   - modifed the conversion of SJA1000 filter params into
+*                    M16C params. Due to compatibility reasons with the
+*                    older 82C200 CAN controller the SJA1000
+****************************************************************************/
+int SJA1000_TO_M16C_BASIC_Params(CPC_MSG_T * in)
+{
+	int sjaBaudrate;
+	int sjaSamplepoint;
+	int *baudrate_error;	// BRP[0..15], PR[0..7], PH1[0..7], PH2[0..7]
+	int *samplepoint_error;	// BRP[0..15], PR[0..7], PH1[0..7], PH2[0..7]
+	int baudrate_error_merk;
+	int clk, brp, pr, ph1, ph2;
+	int clk_merk, brp_merk, pr_merk, ph1_merk, ph2_merk;
+	int index;
+	unsigned char acc_code0, acc_code1, acc_code2, acc_code3;
+	unsigned char acc_mask0, acc_mask1, acc_mask2, acc_mask3;
+	CPC_MSG_T * out;
+	C0CONR_T c0con;
+	C1CONR_T c1con;
+	int tmpAccCode;
+	int tmpAccMask;
+
+	    // we have to convert the parameters into M16C parameters
+	    CPC_SJA1000_PARAMS_T * pParams;
+
+	    // check if the type is CAN parameters and if we have to convert the given params
+	    if (in->type != CPC_CMD_T_CAN_PRMS
+		|| in->msg.canparams.cc_type != SJA1000)
+		return 0;
+	pParams =
+	    (CPC_SJA1000_PARAMS_T *) & in->msg.canparams.cc_params.sja1000;
+	acc_code0 = pParams->acc_code0;
+	acc_code1 = pParams->acc_code1;
+	acc_code2 = pParams->acc_code2;
+	acc_code3 = pParams->acc_code3;
+	acc_mask0 = pParams->acc_mask0;
+	acc_mask1 = pParams->acc_mask1;
+	acc_mask2 = pParams->acc_mask2;
+	acc_mask3 = pParams->acc_mask3;
+
+#ifdef _DEBUG_OUTPUT_CAN_PARAMS
+	    info("acc_code0: %2.2Xh\n", acc_code0);
+	info("acc_code1: %2.2Xh\n", acc_code1);
+	info("acc_code2: %2.2Xh\n", acc_code2);
+	info("acc_code3: %2.2Xh\n", acc_code3);
+	info("acc_mask0: %2.2Xh\n", acc_mask0);
+	info("acc_mask1: %2.2Xh\n", acc_mask1);
+	info("acc_mask2: %2.2Xh\n", acc_mask2);
+	info("acc_mask3: %2.2Xh\n", acc_mask3);
+
+#endif	/*  */
+	    if (!
+		 (baudrate_error =
+		  (int *) vmalloc(sizeof(int) * 16 * 8 * 8 * 8 * 5))) {
+		err("Could not allocate memory\n");
+		return -3;
+	}
+	if (!
+	      (samplepoint_error =
+	       (int *) vmalloc(sizeof(int) * 16 * 8 * 8 * 8 * 5))) {
+		err("Could not allocate memory\n");
+		vfree(baudrate_error);
+		return -3;
+	}
+	memset(baudrate_error, 0xff, sizeof(baudrate_error));
+	memset(samplepoint_error, 0xff, sizeof(baudrate_error));
+	sjaBaudrate =
+	    16000000 / 2 / SJA_BRP / (1 + SJA_TSEG1 + SJA_TSEG2);
+	sjaSamplepoint =
+	    100 * (1 + SJA_TSEG1) / (1 + SJA_TSEG1 + SJA_TSEG2);
+	if (sjaBaudrate == 0) {
+		vfree(baudrate_error);
+		vfree(samplepoint_error);
+		return -2;
+	}
+
+#ifdef _DEBUG_OUTPUT_CAN_PARAMS
+	    info("\nStarting SJA CAN params\n");
+	info("-------------------------\n");
+	info("TS1     : %2.2Xh TS2 : %2.2Xh\n", SJA_TSEG1, SJA_TSEG2);
+	info("BTR0    : %2.2Xh BTR1: %2.2Xh\n", pParams->btr0,
+	      pParams->btr1);
+	info("Baudrate: %d.%dkBaud\n", sjaBaudrate / 1000,
+	      sjaBaudrate % 1000);
+	info("Sample P: 0.%d\n", sjaSamplepoint);
+	info("\n");
+
+#endif	/*  */
+	    c0con.bc0con.sam = SJA_SAM;
+	c1con.bc1con.sjw = SJA_SJW;
+
+	    // calculate errors for all baudrates
+	    index = 0;
+	for (clk = 0; clk < 5; clk++) {
+		for (brp = 0; brp < 16; brp++) {
+			for (pr = 0; pr < 8; pr++) {
+				for (ph1 = 0; ph1 < 8; ph1++) {
+					for (ph2 = 0; ph2 < 8; ph2++) {
+						baudrate_error[index] =
+						    100 *
+						    abs(baudrate_m16c
+							(clk, brp, pr, ph1,
+							 ph2) -
+							sjaBaudrate) /
+						    sjaBaudrate;
+						samplepoint_error[index] =
+						    abs(samplepoint_m16c
+							(brp, pr, ph1,
+							 ph2) -
+							sjaSamplepoint);
+
+#if 0
+						    info
+						    ("Baudrate      : %d kBaud\n",
+						     baudrate_m16c(clk,
+								   brp, pr,
+								   ph1,
+								   ph2));
+						info
+						    ("Baudrate Error: %d\n",
+						     baudrate_error
+						     [index]);
+						info
+						    ("Sample P Error: %d\n",
+						     samplepoint_error
+						     [index]);
+						info
+						    ("clk           : %d\n",
+						     clk);
+
+#endif	/*  */
+						    index++;
+					}
+				}
+			}
+		}
+	}
+
+	    // mark all baudrate_error entries which are outer limits
+	    index = 0;
+	for (clk = 0; clk < 5; clk++) {
+		for (brp = 0; brp < 16; brp++) {
+			for (pr = 0; pr < 8; pr++) {
+				for (ph1 = 0; ph1 < 8; ph1++) {
+					for (ph2 = 0; ph2 < 8; ph2++) {
+						if ((baudrate_error[index]
+						      >
+						      BAUDRATE_TOLERANCE_PERCENT)
+						     ||
+						     (samplepoint_error
+						       [index] >
+						       SAMPLEPOINT_TOLERANCE_PERCENT)
+						     ||
+						     (samplepoint_m16c
+						       (brp, pr, ph1,
+							ph2) >
+						       SAMPLEPOINT_UPPER_LIMIT))
+						{
+							baudrate_error
+							    [index] = -1;
+						} else
+						    if (((1 + pr + 1 +
+							  ph1 + 1 + ph2 +
+							  1) < 8)
+							||
+							((1 + pr + 1 +
+							  ph1 + 1 + ph2 +
+							  1) > 25)) {
+							baudrate_error
+							    [index] = -1;
+						}
+
+#if 0
+						    else {
+							info
+							    ("Baudrate      : %d kBaud\n",
+							     baudrate_m16c
+							     (clk, brp, pr,
+							      ph1, ph2));
+							info
+							    ("Baudrate Error: %d\n",
+							     baudrate_error
+							     [index]);
+							info
+							    ("Sample P Error: %d\n",
+							     samplepoint_error
+							     [index]);
+						}
+
+#endif	/*  */
+						    index++;
+					}
+				}
+			}
+		}
+	}
+
+	    // find list of minimum of baudrate_error within unmarked entries
+	    clk_merk = brp_merk = pr_merk = ph1_merk = ph2_merk = 0;
+	baudrate_error_merk = 100;
+	index = 0;
+	for (clk = 0; clk < 5; clk++) {
+		for (brp = 0; brp < 16; brp++) {
+			for (pr = 0; pr < 8; pr++) {
+				for (ph1 = 0; ph1 < 8; ph1++) {
+					for (ph2 = 0; ph2 < 8; ph2++) {
+						if (baudrate_error[index]
+						     != -1) {
+							if (baudrate_error
+							     [index] <
+							     baudrate_error_merk)
+							{
+								baudrate_error_merk
+								    =
+								    baudrate_error
+								    [index];
+								brp_merk =
+								    brp;
+								pr_merk =
+								    pr;
+								ph1_merk =
+								    ph1;
+								ph2_merk =
+								    ph2;
+								clk_merk =
+								    clk;
+
+#if 0
+								    info
+								    ("brp: %2.2Xh pr: %2.2Xh ph1: %2.2Xh ph2: %2.2Xh\n",
+								     brp,
+								     pr,
+								     ph1,
+								     ph2);
+								info
+								    ("Baudrate      : %d kBaud\n",
+								     baudrate_m16c
+								     (clk,
+								      brp,
+								      pr,
+								      ph1,
+								      ph2));
+								info
+								    ("Baudrate Error: %d\n",
+								     baudrate_error
+								     [index]);
+								info
+								    ("Sample P Error: %d\n",
+								     samplepoint_error
+								     [index]);
+
+#endif	/*  */
+							}
+						}
+						index++;
+					}
+				}
+			}
+		}
+	}
+	if (baudrate_error_merk == 100) {
+		info("ERROR: Could not convert CAN init parameter\n");
+		vfree(baudrate_error);
+		vfree(samplepoint_error);
+		return -1;
+	}
+
+	    // setting m16c CAN parameter
+	    c0con.bc0con.brp = brp_merk;
+	c0con.bc0con.pr = pr_merk;
+	c1con.bc1con.ph1 = ph1_merk;
+	c1con.bc1con.ph2 = ph2_merk;
+
+#ifdef _DEBUG_OUTPUT_CAN_PARAMS
+	    info("\nResulting M16C CAN params\n");
+	info("-------------------------\n");
+	info("clk     : %2.2Xh\n", clk_merk);
+	info("ph1     : %2.2Xh ph2: %2.2Xh\n", c1con.bc1con.ph1 + 1,
+	      c1con.bc1con.ph2 + 1);
+	info("pr      : %2.2Xh brp: %2.2Xh\n", c0con.bc0con.pr + 1,
+	      c0con.bc0con.brp + 1);
+	info("sjw     : %2.2Xh sam: %2.2Xh\n", c1con.bc1con.sjw,
+	      c0con.bc0con.sam);
+	info("co1     : %2.2Xh co0: %2.2Xh\n", c1con.c1con, c0con.c0con);
+	info("Baudrate: %d.%dBaud\n",
+	       baudrate_m16c(clk_merk, c0con.bc0con.brp, c0con.bc0con.pr,
+			     c1con.bc1con.ph1, c1con.bc1con.ph2) / 1000,
+	       baudrate_m16c(clk_merk, c0con.bc0con.brp, c0con.bc0con.pr,
+			      c1con.bc1con.ph1, c1con.bc1con.ph2) % 1000);
+	info("Sample P: 0.%d\n",
+	      samplepoint_m16c(c0con.bc0con.brp, c0con.bc0con.pr,
+			       c1con.bc1con.ph1, c1con.bc1con.ph2));
+	info("\n");
+
+#endif	/*  */
+	    out = in;
+	out->type = 6;
+	out->length = sizeof(CPC_M16C_BASIC_PARAMS_T) + 1;
+	out->msg.canparams.cc_type = M16C_BASIC;
+	out->msg.canparams.cc_params.m16c_basic.con0 = c0con.c0con;
+	out->msg.canparams.cc_params.m16c_basic.con1 = c1con.c1con;
+	out->msg.canparams.cc_params.m16c_basic.ctlr0 = 0x4C;
+	out->msg.canparams.cc_params.m16c_basic.ctlr1 = 0x00;
+	out->msg.canparams.cc_params.m16c_basic.clk = clk_merk;
+	out->msg.canparams.cc_params.m16c_basic.acc_std_code0 =
+	    acc_code0;
+	out->msg.canparams.cc_params.m16c_basic.acc_std_code1 = acc_code1;
+
+//      info("code0: 0x%2.2X, code1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_code0, out->msg.canparams.cc_params.m16c_basic.acc_std_code1);
+	    tmpAccCode = (acc_code1 >> 5) + (acc_code0 << 3);
+	out->msg.canparams.cc_params.m16c_basic.acc_std_code0 =
+	    (unsigned char) tmpAccCode;
+	out->msg.canparams.cc_params.m16c_basic.acc_std_code1 =
+	    (unsigned char) (tmpAccCode >> 8);
+
+//      info("code0: 0x%2.2X, code1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_code0, out->msg.canparams.cc_params.m16c_basic.acc_std_code1);
+	    out->msg.canparams.cc_params.m16c_basic.acc_std_mask0 =
+	    ~acc_mask0;
+	out->msg.canparams.cc_params.m16c_basic.acc_std_mask1 =
+	    ~acc_mask1;
+
+//      info("mask0: 0x%2.2X, mask1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_mask0, out->msg.canparams.cc_params.m16c_basic.acc_std_mask1);
+	    tmpAccMask = ((acc_mask1) >> 5) + ((acc_mask0) << 3);
+
+//      info("tmpAccMask: 0x%4.4X\n", tmpAccMask);
+	    out->msg.canparams.cc_params.m16c_basic.acc_std_mask0 =
+	    (unsigned char) ~tmpAccMask;
+	out->msg.canparams.cc_params.m16c_basic.acc_std_mask1 =
+	    (unsigned char) ~(tmpAccMask >> 8);
+
+//      info("mask0: 0x%2.2X, mask1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_mask0, out->msg.canparams.cc_params.m16c_basic.acc_std_mask1);
+	    out->msg.canparams.cc_params.m16c_basic.acc_ext_code0 =
+	    (unsigned char) tmpAccCode;
+	out->msg.canparams.cc_params.m16c_basic.acc_ext_code1 =
+	    (unsigned char) (tmpAccCode >> 8);
+	out->msg.canparams.cc_params.m16c_basic.acc_ext_code2 = acc_code2;
+	out->msg.canparams.cc_params.m16c_basic.acc_ext_code3 = acc_code3;
+	out->msg.canparams.cc_params.m16c_basic.acc_ext_mask0 =
+	    (unsigned char) ~tmpAccMask;
+	out->msg.canparams.cc_params.m16c_basic.acc_ext_mask1 =
+	    (unsigned char) ~(tmpAccMask >> 8);
+	out->msg.canparams.cc_params.m16c_basic.acc_ext_mask2 =
+	    ~acc_mask2;
+	out->msg.canparams.cc_params.m16c_basic.acc_ext_mask3 =
+	    ~acc_mask3;
+	vfree(baudrate_error);
+	vfree(samplepoint_error);
+	return 0;
+}
+
+