capidrv.c

讲述linux的初始化过程

/*
 * $Id: capidrv.c,v 1.39 2000/11/23 20:45:14 kai Exp $
 *
 * ISDN4Linux Driver, using capi20 interface (kernelcapi)
 *
 * Copyright 1997 by Carsten Paeth ([e-mail])
 *
 * $Log: capidrv.c,v $
 * Revision 1.39  2000/11/23 20:45:14  kai
 * fixed module_init/exit stuff
 * Note: compiled-in kernel doesn't work pre 2.2.18 anymore.
 *
 * Revision 1.38  2000/11/14 08:43:07  calle
 * Bugfix for v110. Connectparamters where setup for sync ...
 *
 * Revision 1.37  2000/11/01 14:05:02  calle
 * - use module_init/module_exit from linux/init.h.
 * - all static struct variables are initialized with "membername:" now.
 * - avm_cs.c, let it work with newer pcmcia-cs.
 *
 * Revision 1.36  2000/06/26 15:13:41  keil
 * features should be or'ed
 *
 * Revision 1.35  2000/06/19 15:11:25  keil
 * avoid use of freed structs
 * changes from 2.4.0-ac21
 *
 * Revision 1.34  2000/06/19 13:13:55  calle
 * Added Modemsupport!
 *
 * Revision 1.33  2000/05/06 00:52:36  kai
 * merged changes from kernel tree
 * fixed timer and net_device->name breakage
 *
 * Revision 1.32  2000/04/07 15:19:58  calle
 * remove warnings
 *
 * Revision 1.31  2000/04/06 15:01:25  calle
 * Bugfix: crash in capidrv.c when reseting a capi controller.
 * - changed code order on remove of controller.
 * - using tq_schedule for notifier in kcapi.c.
 * - now using spin_lock_irqsave() and spin_unlock_irqrestore().
 * strange: sometimes even MP hang on unload of isdn.o ...
 *
 * Revision 1.30  2000/03/03 15:50:42  calle
 * - kernel CAPI:
 *   - Changed parameter "param" in capi_signal from __u32 to void *.
 *   - rewrote notifier handling in kcapi.c
 *   - new notifier NCCI_UP and NCCI_DOWN
 * - User CAPI:
 *   - /dev/capi20 is now a cloning device.
 *   - middleware extentions prepared.
 * - capidrv.c
 *   - locking of list operations and module count updates.
 *
 * Revision 1.29  1999/12/06 17:13:06  calle
 * Added controller watchdog.
 *
 * Revision 1.28  1999/11/05 16:22:37  calle
 * Bugfix: Missing break in switch on ISDN_CMD_HANGUP.
 *
 * Revision 1.27  1999/09/16 15:13:04  calle
 * forgot to change paramter type of contr for lower_callback ...
 *
 * Revision 1.26  1999/08/06 07:41:16  calle
 * Added the "vbox patch". if (si1 == 1) si2 = 0;
 *
 * Revision 1.25  1999/08/04 10:10:11  calle
 * Bugfix: corrected /proc functions, added structure for new AVM cards.
 *
 * Revision 1.24  1999/07/20 06:48:02  calle
 * Bugfix: firmware version check for D2 trace was too restrictiv.
 *
 * Revision 1.23  1999/07/09 15:05:44  keil
 * compat.h is now isdn_compat.h
 *
 * Revision 1.22  1999/07/06 07:24:14  calle
 * Bugfix: call to kfree_skb in capidrv_signal was too early,
 *         thanks to Lars Heete <[e-mail]>.
 *
 * Revision 1.21  1999/07/01 15:26:34  calle
 * complete new version (I love it):
 * + new hardware independed "capi_driver" interface that will make it easy to:
 *   - support other controllers with CAPI-2.0 (i.e. USB Controller)
 *   - write a CAPI-2.0 for the passive cards
 *   - support serial link CAPI-2.0 boxes.
 * + wrote "capi_driver" for all supported cards.
 * + "capi_driver" (supported cards) now have to be configured with
 *   make menuconfig, in the past all supported cards where included
 *   at once.
 * + new and better informations in /proc/capi/
 * + new ioctl to switch trace of capi messages per controller
 *   using "avmcapictrl trace [contr] on|off|...."
 * + complete testcircle with all supported cards and also the
 *   PCMCIA cards (now patch for pcmcia-cs-3.0.13 needed) done.
 *
 * Revision 1.20  1999/07/01 08:22:59  keil
 * compatibility macros now in <linux/isdn_compat.h>
 *
 * Revision 1.19  1999/06/29 16:16:54  calle
 * Let ISDN_CMD_UNLOAD work with open isdn devices without crash again.
 * Also right unlocking (ISDN_CMD_UNLOCK) is done now.
 * isdnlog should check returncode of read(2) calls.
 *
 * Revision 1.18  1999/06/21 15:24:15  calle
 * extend information in /proc.
 *
 * Revision 1.17  1999/06/10 16:53:55  calle
 * Removing of module b1pci will now remove card from lower level.
 *
 * Revision 1.16  1999/05/31 11:50:33  calle
 * Bugfix: In if_sendbuf, skb_push'ed DATA_B3 header was not skb_pull'ed
 *         on failure, result in data block with DATA_B3 header transmitted
 *
 * Revision 1.15  1999/05/25 21:26:16  calle
 * Include CAPI-Channelallocation (leased lines) from the 2.0 tree.
 *
 * Revision 1.14  1999/05/22 07:55:06  calle
 * Added *V110* to AVM B1 driver.
 *
 * Revision 1.13  1998/06/26 15:12:55  fritz
 * Added handling of STAT_ICALL with incomplete CPN.
 * Added AT&L for ttyI emulator.
 * Added more locking stuff in tty_write.
 *
 * Revision 1.12  1998/03/29 16:06:03  calle
 * changes from 2.0 tree merged.
 *
 * Revision 1.3.2.10  1998/03/20 14:38:24  calle
 * capidrv: prepared state machines for suspend/resume/hold
 * capidrv: fix bug in state machine if B1/T1 is out of nccis
 * b1capi: changed some errno returns.
 * b1capi: detect if you try to add same T1 to different io address.
 * b1capi: change number of nccis depending on number of channels.
 * b1lli: cosmetics
 *
 * Revision 1.3.2.9  1998/03/20 09:01:12  calle
 * Changes capi_register handling to get full support for 30 bchannels.
 *
 * Revision 1.3.2.8  1998/03/18 17:51:28  calle
 * added controller number to error messages
 *
 * Revision 1.3.2.7  1998/02/27 15:40:47  calle
 * T1 running with slow link. bugfix in capi_release.
 *
 * Revision 1.11  1998/02/13 07:09:15  calle
 * change for 2.1.86 (removing FREE_READ/FREE_WRITE from [dev]_kfree_skb()
 *
 * Revision 1.10  1998/02/02 19:52:23  calle
 * Fixed vbox (audio) acceptb.
 *
 * Revision 1.9  1998/01/31 11:14:45  calle
 * merged changes to 2.0 tree, prepare 2.1.82 to work.
 *
 * Revision 1.8  1997/11/04 06:12:09  calle
 * capi.c: new read/write in file_ops since 2.1.60
 * capidrv.c: prepared isdnlog interface for d2-trace in newer firmware.
 * capiutil.c: needs config.h (CONFIG_ISDN_DRV_AVMB1_VERBOSE_REASON)
 * compat.h: added #define LinuxVersionCode
 *
 * Revision 1.7  1997/10/11 10:36:34  calle
 * Added isdnlog support. patch to isdnlog needed.
 *
 * Revision 1.6  1997/10/11 10:25:55  calle
 * New interface for lowlevel drivers. BSENT with nr. of bytes sent,
 * allow sending without ACK.
 *
 * Revision 1.5  1997/10/01 09:21:16  fritz
 * Removed old compatibility stuff for 2.0.X kernels.
 * From now on, this code is for 2.1.X ONLY!
 * Old stuff is still in the separate branch.
 *
 * Revision 1.4  1997/07/13 12:22:43  calle
 * bug fix for more than one controller in connect_req.
 * debugoutput now with contrnr.
 *
 * Revision 1.3  1997/05/18 09:24:15  calle
 * added verbose disconnect reason reporting to avmb1.
 * some fixes in capi20 interface.
 * changed info messages for B1-PCI
 *
 * Revision 1.2  1997/03/05 21:19:59  fritz
 * Removed include of config.h (mkdep stated this is unneded).
 *
 * Revision 1.1  1997/03/04 21:50:31  calle
 * Frirst version in isdn4linux
 *
 * Revision 2.2  1997/02/12 09:31:39  calle
 * new version
 *
 * Revision 1.1  1997/01/31 10:32:20  calle
 * Initial revision
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/signal.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/skbuff.h>
#include <linux/isdn.h>
#include <linux/isdnif.h>
#include <linux/proc_fs.h>
#include <linux/capi.h>
#include <linux/kernelcapi.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <asm/segment.h>

#include "capiutil.h"
#include "capicmd.h"
#include "capidrv.h"

static char *revision = "$Revision: 1.39 $";
static int debugmode = 0;

MODULE_AUTHOR("Carsten Paeth <[e-mail]>");
MODULE_PARM(debugmode, "i");

/* -------- type definitions ----------------------------------------- */


struct capidrv_contr {

	struct capidrv_contr *next;

	__u32 contrnr;
	char name[20];

	/*
	 * for isdn4linux
	 */
	isdn_if interface;
	int myid;

	/*
	 * LISTEN state
	 */
	int state;
	__u32 cipmask;
	__u32 cipmask2;
        struct timer_list listentimer;

	/*
	 * ID of capi message sent
	 */
	__u16 msgid;

	/*
	 * B-Channels
	 */
	int nbchan;
	struct capidrv_bchan {
		struct capidrv_contr *contr;
		__u8 msn[ISDN_MSNLEN];
		int l2;
		int l3;
		__u8 num[ISDN_MSNLEN];
		__u8 mynum[ISDN_MSNLEN];
		int si1;
		int si2;
		int incoming;
		int disconnecting;
		struct capidrv_plci {
			struct capidrv_plci *next;
			__u32 plci;
			__u32 ncci;	/* ncci for CONNECT_ACTIVE_IND */
			__u16 msgid;	/* to identfy CONNECT_CONF */
			int chan;
			int state;
			int leasedline;
			struct capidrv_ncci {
				struct capidrv_ncci *next;
				struct capidrv_plci *plcip;
				__u32 ncci;
				__u16 msgid;	/* to identfy CONNECT_B3_CONF */
				int chan;
				int state;
				int oldstate;
				/* */
				__u16 datahandle;
				struct ncci_datahandle_queue {
				    struct ncci_datahandle_queue *next;
				    __u16                         datahandle;
				    int                           len;
				} *ackqueue;
			} *ncci_list;
		} *plcip;
		struct capidrv_ncci *nccip;
	} *bchans;

	struct capidrv_plci *plci_list;

	/* for q931 data */
	__u8  q931_buf[4096];
	__u8 *q931_read;
	__u8 *q931_write;
	__u8 *q931_end;
};


struct capidrv_data {
	__u16 appid;
	int ncontr;
	struct capidrv_contr *contr_list;

        /* statistic */
	unsigned long nrecvctlpkt;
	unsigned long nrecvdatapkt;
	unsigned long nsentctlpkt;
	unsigned long nsentdatapkt;
};

typedef struct capidrv_plci capidrv_plci;
typedef struct capidrv_ncci capidrv_ncci;
typedef struct capidrv_contr capidrv_contr;
typedef struct capidrv_data capidrv_data;
typedef struct capidrv_bchan capidrv_bchan;

/* -------- data definitions ----------------------------------------- */

static capidrv_data global;
static spinlock_t global_lock = SPIN_LOCK_UNLOCKED;
static struct capi_interface *capifuncs;

static void handle_dtrace_data(capidrv_contr *card,
	int send, int level2, __u8 *data, __u16 len);

/* -------- convert functions ---------------------------------------- */

static inline __u32 b1prot(int l2, int l3)
{
	switch (l2) {
	case ISDN_PROTO_L2_X75I:
	case ISDN_PROTO_L2_X75UI:
	case ISDN_PROTO_L2_X75BUI:
		return 0;
	case ISDN_PROTO_L2_HDLC:
	default:
		return 0;
	case ISDN_PROTO_L2_TRANS:
		return 1;
        case ISDN_PROTO_L2_V11096:
        case ISDN_PROTO_L2_V11019:
        case ISDN_PROTO_L2_V11038:
		return 2;
        case ISDN_PROTO_L2_FAX:
		return 4;
	case ISDN_PROTO_L2_MODEM:
		return 8;
	}
}

static inline __u32 b2prot(int l2, int l3)
{
	switch (l2) {
	case ISDN_PROTO_L2_X75I:
	case ISDN_PROTO_L2_X75UI:
	case ISDN_PROTO_L2_X75BUI:
	default:
		return 0;
	case ISDN_PROTO_L2_HDLC:
	case ISDN_PROTO_L2_TRANS:
        case ISDN_PROTO_L2_V11096:
        case ISDN_PROTO_L2_V11019:
        case ISDN_PROTO_L2_V11038:
	case ISDN_PROTO_L2_MODEM:
		return 1;
        case ISDN_PROTO_L2_FAX:
		return 4;
	}
}

static inline __u32 b3prot(int l2, int l3)
{
	switch (l2) {
	case ISDN_PROTO_L2_X75I:
	case ISDN_PROTO_L2_X75UI:
	case ISDN_PROTO_L2_X75BUI:
	case ISDN_PROTO_L2_HDLC:
	case ISDN_PROTO_L2_TRANS:
        case ISDN_PROTO_L2_V11096:
        case ISDN_PROTO_L2_V11019:
        case ISDN_PROTO_L2_V11038:
	case ISDN_PROTO_L2_MODEM:
	default:
		return 0;
        case ISDN_PROTO_L2_FAX:
		return 4;
	}
}

static _cstruct b1config_async_v110(__u16 rate)
{
	/* CAPI-Spec "B1 Configuration" */
	static unsigned char buf[9];
	buf[0] = 8; /* len */
	/* maximum bitrate */
	buf[1] = rate & 0xff; buf[2] = (rate >> 8) & 0xff;
	buf[3] = 8; buf[4] = 0; /* 8 bits per character */
	buf[5] = 0; buf[6] = 0; /* parity none */
	buf[7] = 0; buf[8] = 0; /* 1 stop bit */
	return buf;
}

static _cstruct b1config(int l2, int l3)
{
	switch (l2) {
	case ISDN_PROTO_L2_X75I:
	case ISDN_PROTO_L2_X75UI:
	case ISDN_PROTO_L2_X75BUI:
	case ISDN_PROTO_L2_HDLC:
	case ISDN_PROTO_L2_TRANS:
	default:
		return 0;
        case ISDN_PROTO_L2_V11096:
	    return b1config_async_v110(9600);
        case ISDN_PROTO_L2_V11019:
	    return b1config_async_v110(19200);
        case ISDN_PROTO_L2_V11038:
	    return b1config_async_v110(38400);
	}
}

static inline __u16 si2cip(__u8 si1, __u8 si2)
{
	static const __u8 cip[17][5] =
	{
	/*  0  1  2  3  4  */
		{0, 0, 0, 0, 0},	/*0 */
		{16, 16, 4, 26, 16},	/*1 */
		{17, 17, 17, 4, 4},	/*2 */
		{2, 2, 2, 2, 2},	/*3 */
		{18, 18, 18, 18, 18},	/*4 */
		{2, 2, 2, 2, 2},	/*5 */
		{0, 0, 0, 0, 0},	/*6 */
		{2, 2, 2, 2, 2},	/*7 */
		{2, 2, 2, 2, 2},	/*8 */
		{21, 21, 21, 21, 21},	/*9 */
		{19, 19, 19, 19, 19},	/*10 */
		{0, 0, 0, 0, 0},	/*11 */
		{0, 0, 0, 0, 0},	/*12 */
		{0, 0, 0, 0, 0},	/*13 */
		{0, 0, 0, 0, 0},	/*14 */
		{22, 22, 22, 22, 22},	/*15 */
		{27, 27, 27, 28, 27}	/*16 */
	};
	if (si1 > 16)
		si1 = 0;
	if (si2 > 4)
		si2 = 0;

	return (__u16) cip[si1][si2];