gigaset.h

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/*
 * Siemens Gigaset 307x driver
 * Common header file for all connection variants
 *
 * Written by Stefan Eilers
 *        and Hansjoerg Lipp <[e-mail]>
 *
 * =====================================================================
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License as
 *	published by the Free Software Foundation; either version 2 of
 *	the License, or (at your option) any later version.
 * =====================================================================
 */

#ifndef GIGASET_H
#define GIGASET_H

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/isdnif.h>
#include <linux/usb.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/ppp_defs.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/list.h>
#include <asm/atomic.h>

#define GIG_VERSION {0,5,0,0}
#define GIG_COMPAT  {0,4,0,0}

#define MAX_REC_PARAMS 10	/* Max. number of params in response string */
#define MAX_RESP_SIZE 512	/* Max. size of a response string */
#define HW_HDR_LEN 2		/* Header size used to store ack info */

#define MAX_EVENTS 64		/* size of event queue */

#define RBUFSIZE 8192
#define SBUFSIZE 4096		/* sk_buff payload size */

#define TRANSBUFSIZE 768	/* bytes per skb for transparent receive */
#define MAX_BUF_SIZE (SBUFSIZE - 2)	/* Max. size of a data packet from LL */

/* compile time options */
#define GIG_MAJOR 0

#define GIG_MAYINITONDIAL
#define GIG_RETRYCID
#define GIG_X75

#define GIG_TICK 100		/* in milliseconds */

/* timeout values (unit: 1 sec) */
#define INIT_TIMEOUT 1

/* timeout values (unit: 0.1 sec) */
#define RING_TIMEOUT 3		/* for additional parameters to RING */
#define BAS_TIMEOUT 20		/* for response to Base USB ops */
#define ATRDY_TIMEOUT 3		/* for HD_READY_SEND_ATDATA */

#define BAS_RETRY 3		/* max. retries for base USB ops */

#define MAXACT 3

extern int gigaset_debuglevel;	/* "needs" cast to (enum debuglevel) */

/* any combination of these can be given with the 'debug=' parameter to insmod,
 * e.g. 'insmod usb_gigaset.o debug=0x2c' will set DEBUG_OPEN, DEBUG_CMD and
 * DEBUG_INTR.
 */
enum debuglevel {
	DEBUG_REG	  = 0x0002, /* serial port I/O register operations */
	DEBUG_OPEN	  = 0x0004, /* open/close serial port */
	DEBUG_INTR	  = 0x0008, /* interrupt processing */
	DEBUG_INTR_DUMP	  = 0x0010, /* Activating hexdump debug output on
				       interrupt requests, not available as
				       run-time option */
	DEBUG_CMD	  = 0x00020, /* sent/received LL commands */
	DEBUG_STREAM	  = 0x00040, /* application data stream I/O events */
	DEBUG_STREAM_DUMP = 0x00080, /* application data stream content */
	DEBUG_LLDATA	  = 0x00100, /* sent/received LL data */
	DEBUG_INTR_0	  = 0x00200, /* serial port interrupt processing */
	DEBUG_DRIVER	  = 0x00400, /* driver structure */
	DEBUG_HDLC	  = 0x00800, /* M10x HDLC processing */
	DEBUG_WRITE	  = 0x01000, /* M105 data write */
	DEBUG_TRANSCMD	  = 0x02000, /* AT-COMMANDS+RESPONSES */
	DEBUG_MCMD	  = 0x04000, /* COMMANDS THAT ARE SENT VERY OFTEN */
	DEBUG_INIT	  = 0x08000, /* (de)allocation+initialization of data
					structures */
	DEBUG_LOCK	  = 0x10000, /* semaphore operations */
	DEBUG_OUTPUT	  = 0x20000, /* output to device */
	DEBUG_ISO	  = 0x40000, /* isochronous transfers */
	DEBUG_IF	  = 0x80000, /* character device operations */
	DEBUG_USBREQ	  = 0x100000, /* USB communication (except payload
					 data) */
	DEBUG_LOCKCMD	  = 0x200000, /* AT commands and responses when
					 MS_LOCKED */

	DEBUG_ANY	  = 0x3fffff, /* print message if any of the others is
					 activated */
};

/* missing from linux/device.h ... */
#ifndef dev_notice
#define dev_notice(dev, format, arg...)		\
	dev_printk(KERN_NOTICE , dev , format , ## arg)
#endif

/* Kernel message macros for situations where dev_printk and friends cannot be
 * used for lack of reliable access to a device structure.
 * linux/usb.h already contains these but in an obsolete form which clutters
 * the log needlessly, and according to the USB maintainer those should be
 * removed rather than fixed anyway.
 */
#undef err
#undef info
#undef warn
#undef notice

#define err(format, arg...) printk(KERN_ERR KBUILD_MODNAME ": " \
	format "\n" , ## arg)
#define info(format, arg...) printk(KERN_INFO KBUILD_MODNAME ": " \
	format "\n" , ## arg)
#define warn(format, arg...) printk(KERN_WARNING KBUILD_MODNAME ": " \
	format "\n" , ## arg)
#define notice(format, arg...) printk(KERN_NOTICE KBUILD_MODNAME ": " \
	format "\n" , ## arg)

#ifdef CONFIG_GIGASET_DEBUG

#define gig_dbg(level, format, arg...) \
	do { \
		if (unlikely(((enum debuglevel)gigaset_debuglevel) & (level))) \
			printk(KERN_DEBUG KBUILD_MODNAME ": " format "\n", \
			       ## arg); \
	} while (0)
#define DEBUG_DEFAULT (DEBUG_TRANSCMD | DEBUG_CMD | DEBUG_USBREQ)

#else

#define gig_dbg(level, format, arg...) do {} while (0)
#define DEBUG_DEFAULT 0

#endif

void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
			size_t len, const unsigned char *buf);

/* connection state */
#define ZSAU_NONE			0
#define ZSAU_DISCONNECT_IND		4
#define ZSAU_OUTGOING_CALL_PROCEEDING	1
#define ZSAU_PROCEEDING			1
#define ZSAU_CALL_DELIVERED		2
#define ZSAU_ACTIVE			3
#define ZSAU_NULL			5
#define ZSAU_DISCONNECT_REQ		6
#define ZSAU_UNKNOWN			-1

/* USB control transfer requests */
#define OUT_VENDOR_REQ	(USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
#define IN_VENDOR_REQ	(USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)

/* int-in-events 3070 */
#define HD_B1_FLOW_CONTROL		0x80
#define HD_B2_FLOW_CONTROL		0x81
#define HD_RECEIVEATDATA_ACK		(0x35)		// 3070
						// att: HD_RECEIVE>>AT<<DATA_ACK
#define HD_READY_SEND_ATDATA		(0x36)		// 3070
#define HD_OPEN_ATCHANNEL_ACK		(0x37)		// 3070
#define HD_CLOSE_ATCHANNEL_ACK		(0x38)		// 3070
#define HD_DEVICE_INIT_OK		(0x11)		// ISurf USB + 3070
#define HD_OPEN_B1CHANNEL_ACK		(0x51)		// ISurf USB + 3070
#define HD_OPEN_B2CHANNEL_ACK		(0x52)		// ISurf USB + 3070
#define HD_CLOSE_B1CHANNEL_ACK		(0x53)		// ISurf USB + 3070
#define HD_CLOSE_B2CHANNEL_ACK		(0x54)		// ISurf USB + 3070
// 	 Powermangment
#define HD_SUSPEND_END			(0x61)		// ISurf USB
//   Configuration
#define HD_RESET_INTERRUPT_PIPE_ACK	(0xFF)		// ISurf USB + 3070

/* control requests 3070 */
#define	HD_OPEN_B1CHANNEL		(0x23)		// ISurf USB + 3070
#define	HD_CLOSE_B1CHANNEL		(0x24)		// ISurf USB + 3070
#define	HD_OPEN_B2CHANNEL		(0x25)		// ISurf USB + 3070
#define	HD_CLOSE_B2CHANNEL		(0x26)		// ISurf USB + 3070
#define HD_RESET_INTERRUPT_PIPE		(0x27)		// ISurf USB + 3070
#define	HD_DEVICE_INIT_ACK		(0x34)		// ISurf USB + 3070
#define	HD_WRITE_ATMESSAGE		(0x12)		// 3070
#define	HD_READ_ATMESSAGE		(0x13)		// 3070
#define	HD_OPEN_ATCHANNEL		(0x28)		// 3070
#define	HD_CLOSE_ATCHANNEL		(0x29)		// 3070

/* USB frames for isochronous transfer */
#define BAS_FRAMETIME	1	/* number of milliseconds between frames */
#define BAS_NUMFRAMES	8	/* number of frames per URB */
#define BAS_MAXFRAME	16	/* allocated bytes per frame */
#define BAS_NORMFRAME	8	/* send size without flow control */
#define BAS_HIGHFRAME	10	/* "    "    with positive flow control */
#define BAS_LOWFRAME	5	/* "    "    with negative flow control */
#define BAS_CORRFRAMES	4	/* flow control multiplicator */

#define BAS_INBUFSIZE	(BAS_MAXFRAME * BAS_NUMFRAMES)
					/* size of isoc in buf per URB */
#define BAS_OUTBUFSIZE	4096		/* size of common isoc out buffer */
#define BAS_OUTBUFPAD	BAS_MAXFRAME	/* size of pad area for isoc out buf */

#define BAS_INURBS	3
#define BAS_OUTURBS	3

/* variable commands in struct bc_state */
#define AT_ISO		0
#define AT_DIAL		1
#define AT_MSN		2
#define AT_BC		3
#define AT_PROTO	4
#define AT_TYPE		5
#define AT_HLC		6
#define AT_NUM		7

/* variables in struct at_state_t */
#define VAR_ZSAU	0
#define VAR_ZDLE	1
#define VAR_ZVLS	2
#define VAR_ZCTP	3
#define VAR_NUM		4

#define STR_NMBR	0
#define STR_ZCPN	1
#define STR_ZCON	2
#define STR_ZBC		3
#define STR_ZHLC	4
#define STR_NUM		5

#define EV_TIMEOUT	-105
#define EV_IF_VER	-106
#define EV_PROC_CIDMODE	-107
#define EV_SHUTDOWN	-108
#define EV_START	-110
#define EV_STOP		-111
#define EV_IF_LOCK	-112
#define EV_PROTO_L2	-113
#define EV_ACCEPT	-114
#define EV_DIAL		-115
#define EV_HUP		-116
#define EV_BC_OPEN	-117
#define EV_BC_CLOSED	-118

/* input state */
#define INS_command	0x0001
#define INS_DLE_char	0x0002
#define INS_byte_stuff	0x0004
#define INS_have_data	0x0008
#define INS_skip_frame	0x0010
#define INS_DLE_command	0x0020
#define INS_flag_hunt	0x0040

/* channel state */
#define CHS_D_UP	0x01
#define CHS_B_UP	0x02
#define CHS_NOTIFY_LL	0x04

#define ICALL_REJECT	0
#define ICALL_ACCEPT	1
#define ICALL_IGNORE	2

/* device state */
#define MS_UNINITIALIZED	0
#define MS_INIT			1
#define MS_LOCKED		2
#define MS_SHUTDOWN		3
#define MS_RECOVER		4
#define MS_READY		5

/* mode */
#define M_UNKNOWN	0
#define M_CONFIG	1
#define M_UNIMODEM	2
#define M_CID		3

/* start mode */
#define SM_LOCKED	0
#define SM_ISDN		1 /* default */

struct gigaset_ops;
struct gigaset_driver;

struct usb_cardstate;
struct ser_cardstate;
struct bas_cardstate;

struct bc_state;
struct usb_bc_state;
struct ser_bc_state;
struct bas_bc_state;

struct reply_t {
	int	resp_code;	/* RSP_XXXX */
	int	min_ConState;	/* <0 => ignore */
	int	max_ConState;	/* <0 => ignore */
	int	parameter;	/* e.g. ZSAU_XXXX <0: ignore*/
	int	new_ConState;	/* <0 => ignore */
	int	timeout;	/* >0 => *HZ; <=0 => TOUT_XXXX*/
	int	action[MAXACT];	/* ACT_XXXX */
	char	*command;	/* NULL==none */
};

extern struct reply_t gigaset_tab_cid_m10x[];
extern struct reply_t gigaset_tab_nocid_m10x[];

struct inbuf_t {
	unsigned char		*rcvbuf;	/* usb-gigaset receive buffer */
	struct bc_state		*bcs;
	struct cardstate	*cs;
	int			inputstate;
	atomic_t		head, tail;
	unsigned char		data[RBUFSIZE];
};

/* isochronous write buffer structure
 * circular buffer with pad area for extraction of complete USB frames
 * - data[read..nextread-1] is valid data already submitted to the USB subsystem
 * - data[nextread..write-1] is valid data yet to be sent
 * - data[write] is the next byte to write to
 *   - in byte-oriented L2 procotols, it is completely free
 *   - in bit-oriented L2 procotols, it may contain a partial byte of valid data
 * - data[write+1..read-1] is free
 * - wbits is the number of valid data bits in data[write], starting at the LSB
 * - writesem is the semaphore for writing to the buffer:
 *   if writesem <= 0, data[write..read-1] is currently being written to
 * - idle contains the byte value to repeat when the end of valid data is
 *   reached; if nextread==write (buffer contains no data to send), either the
 *   BAS_OUTBUFPAD bytes immediately before data[write] (if
 *   write>=BAS_OUTBUFPAD) or those of the pad area (if write<BAS_OUTBUFPAD)
 *   are also filled with that value
 */
struct isowbuf_t {
	atomic_t	read;
	atomic_t	nextread;
	atomic_t	write;
	atomic_t	writesem;
	int		wbits;
	unsigned char	data[BAS_OUTBUFSIZE + BAS_OUTBUFPAD];
	unsigned char	idle;
};

/* isochronous write URB context structure
 * data to be stored along with the URB and retrieved when it is returned
 * as completed by the USB subsystem
 * - urb: pointer to the URB itself
 * - bcs: pointer to the B Channel control structure
 * - limit: end of write buffer area covered by this URB
 */
struct isow_urbctx_t {
	struct urb *urb;
	struct bc_state *bcs;
	int limit;
};

/* AT state structure
 * data associated with the state of an ISDN connection, whether or not
 * it is currently assigned a B channel
 */
struct at_state_t {
	struct list_head	list;
	int			waiting;
	int			getstring;
	unsigned		timer_index;
	unsigned long		timer_expires;
	int			timer_active;
	unsigned int		ConState;	/* State of connection */
	struct reply_t		*replystruct;
	int			cid;
	int			int_var[VAR_NUM];	/* see VAR_XXXX */
	char			*str_var[STR_NUM];	/* see STR_XXXX */
	unsigned		pending_commands;	/* see PC_XXXX */
	unsigned		seq_index;

	struct cardstate	*cs;
	struct bc_state		*bcs;
};

struct resp_type_t {
	unsigned char	*response;
	int		resp_code;	/* RSP_XXXX */
	int		type;		/* RT_XXXX */
};

struct event_t {
	int type;
	void *ptr, *arg;
	int parameter;
	int cid;
	struct at_state_t *at_state;
};

/* This buffer holds all information about the used B-Channel */
struct bc_state {
	struct sk_buff *tx_skb;		/* Current transfer buffer to modem */
	struct sk_buff_head squeue;	/* B-Channel send Queue */

	/* Variables for debugging .. */
	int corrupted;			/* Counter for corrupted packages */
	int trans_down;			/* Counter of packages (downstream) */
	int trans_up;			/* Counter of packages (upstream) */

	struct at_state_t at_state;
	unsigned long rcvbytes;

	__u16 fcs;
	struct sk_buff *skb;
	int inputstate;			/* see INS_XXXX */

	int channel;

	struct cardstate *cs;

	unsigned chstate;		/* bitmap (CHS_*) */
	int ignore;
	unsigned proto2;		/* Layer 2 protocol (ISDN_PROTO_L2_*) */
	char *commands[AT_NUM];		/* see AT_XXXX */

#ifdef CONFIG_GIGASET_DEBUG
	int emptycount;
#endif
	int busy;
	int use_count;

	/* private data of hardware drivers */
	union {
		struct ser_bc_state *ser;	/* serial hardware driver */
		struct usb_bc_state *usb;	/* usb hardware driver (m105) */
		struct bas_bc_state *bas;	/* usb hardware driver (base) */
	} hw;
};

struct cardstate {
	struct gigaset_driver *driver;
	unsigned minor_index;
	struct device *dev;

	const struct gigaset_ops *ops;

	/* Stuff to handle communication */
	wait_queue_head_t waitqueue;
	int waiting;