[PATCH] isdn4linux: Siemens Gigaset drivers - event layer

And: Tilman Schmidt <tilman@imap.cc>

This patch adds the event layer to the gigaset module.  The event layer
serializes events from hardware, userspace, and other kernel subsystems.

Signed-off-by: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Cc: Karsten Keil <kkeil@suse.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1983 insertions, 0 deletions

diff --git a/drivers/isdn/gigaset/ev-layer.c b/drivers/isdn/gigaset/ev-layer.c
new file mode 100644
index 000000000000..fdcb80bb21c7
--- /dev/null
+++ b/drivers/isdn/gigaset/ev-layer.c
@@ -0,0 +1,1983 @@
+/*
+ * Stuff used by all variants of the driver
+ *
+ * Copyright (c) 2001 by Stefan Eilers <Eilers.Stefan@epost.de>,
+ *                       Hansjoerg Lipp <hjlipp@web.de>,
+ *                       Tilman Schmidt <tilman@imap.cc>.
+ *
+ * =====================================================================
+ *	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.
+ * =====================================================================
+ * ToDo: ...
+ * =====================================================================
+ * Version: $Id: ev-layer.c,v 1.4.2.18 2006/02/04 18:28:16 hjlipp Exp $
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+
+/* ========================================================== */
+/* bit masks for pending commands */
+#define PC_INIT       0x004
+#define PC_DLE0       0x008
+#define PC_DLE1       0x010
+#define PC_CID        0x080
+#define PC_NOCID      0x100
+#define PC_HUP        0x002
+#define PC_DIAL       0x001
+#define PC_ACCEPT     0x040
+#define PC_SHUTDOWN   0x020
+#define PC_CIDMODE    0x200
+#define PC_UMMODE     0x400
+
+/* types of modem responses */
+#define RT_NOTHING 0
+#define RT_ZSAU    1
+#define RT_RING    2
+#define RT_NUMBER  3
+#define RT_STRING  4
+#define RT_HEX     5
+#define RT_ZCAU    6
+
+/* Possible ASCII responses */
+#define RSP_OK           0
+//#define RSP_BUSY       1
+//#define RSP_CONNECT    2
+#define RSP_ZGCI         3
+#define RSP_RING         4
+#define RSP_ZAOC         5
+#define RSP_ZCSTR        6
+#define RSP_ZCFGT        7
+#define RSP_ZCFG         8
+#define RSP_ZCCR         9
+#define RSP_EMPTY        10
+#define RSP_ZLOG         11
+#define RSP_ZCAU         12
+#define RSP_ZMWI         13
+#define RSP_ZABINFO      14
+#define RSP_ZSMLSTCHG    15
+#define RSP_VAR          100
+#define RSP_ZSAU         (RSP_VAR + VAR_ZSAU)
+#define RSP_ZDLE         (RSP_VAR + VAR_ZDLE)
+#define RSP_ZVLS         (RSP_VAR + VAR_ZVLS)
+#define RSP_ZCTP         (RSP_VAR + VAR_ZCTP)
+#define RSP_STR          (RSP_VAR + VAR_NUM)
+#define RSP_NMBR         (RSP_STR + STR_NMBR)
+#define RSP_ZCPN         (RSP_STR + STR_ZCPN)
+#define RSP_ZCON         (RSP_STR + STR_ZCON)
+#define RSP_ZBC          (RSP_STR + STR_ZBC)
+#define RSP_ZHLC         (RSP_STR + STR_ZHLC)
+#define RSP_ERROR       -1       /* ERROR              */
+#define RSP_WRONG_CID   -2       /* unknown cid in cmd */
+//#define RSP_EMPTY     -3
+#define RSP_UNKNOWN     -4       /* unknown response   */
+#define RSP_FAIL        -5       /* internal error     */
+#define RSP_INVAL       -6       /* invalid response   */
+
+#define RSP_NONE        -19
+#define RSP_STRING      -20
+#define RSP_NULL        -21
+//#define RSP_RETRYFAIL -22
+//#define RSP_RETRY     -23
+//#define RSP_SKIP      -24
+#define RSP_INIT        -27
+#define RSP_ANY         -26
+#define RSP_LAST        -28
+#define RSP_NODEV       -9
+
+/* actions for process_response */
+#define ACT_NOTHING		0
+#define ACT_SETDLE1		1
+#define ACT_SETDLE0		2
+#define ACT_FAILINIT		3
+#define ACT_HUPMODEM		4
+#define ACT_CONFIGMODE		5
+#define ACT_INIT		6
+#define ACT_DLE0		7
+#define ACT_DLE1		8
+#define ACT_FAILDLE0		9
+#define ACT_FAILDLE1		10
+#define ACT_RING		11
+#define ACT_CID			12
+#define ACT_FAILCID		13
+#define ACT_SDOWN		14
+#define ACT_FAILSDOWN		15
+#define ACT_DEBUG		16
+#define ACT_WARN		17
+#define ACT_DIALING		18
+#define ACT_ABORTDIAL		19
+#define ACT_DISCONNECT		20
+#define ACT_CONNECT		21
+#define ACT_REMOTEREJECT	22
+#define ACT_CONNTIMEOUT         23
+#define ACT_REMOTEHUP		24
+#define ACT_ABORTHUP		25
+#define ACT_ICALL		26
+#define ACT_ACCEPTED		27
+#define ACT_ABORTACCEPT		28
+#define ACT_TIMEOUT		29
+#define ACT_GETSTRING		30
+#define ACT_SETVER		31
+#define ACT_FAILVER		32
+#define ACT_GOTVER		33
+#define ACT_TEST		34
+#define ACT_ERROR		35
+#define ACT_ABORTCID		36
+#define ACT_ZCAU		37
+#define ACT_NOTIFY_BC_DOWN      38
+#define ACT_NOTIFY_BC_UP        39
+#define ACT_DIAL                40
+#define ACT_ACCEPT              41
+#define ACT_PROTO_L2            42
+#define ACT_HUP                 43
+#define ACT_IF_LOCK             44
+#define ACT_START               45
+#define ACT_STOP                46
+#define ACT_FAKEDLE0            47
+#define ACT_FAKEHUP             48
+#define ACT_FAKESDOWN           49
+#define ACT_SHUTDOWN            50
+#define ACT_PROC_CIDMODE        51
+#define ACT_UMODESET            52
+#define ACT_FAILUMODE           53
+#define ACT_CMODESET            54
+#define ACT_FAILCMODE           55
+#define ACT_IF_VER              56
+#define ACT_CMD			100
+
+/* at command sequences */
+#define SEQ_NONE      0
+#define SEQ_INIT      100
+#define SEQ_DLE0      200
+#define SEQ_DLE1      250
+#define SEQ_CID       300
+#define SEQ_NOCID     350
+#define SEQ_HUP       400
+#define SEQ_DIAL      600
+#define SEQ_ACCEPT    720
+#define SEQ_SHUTDOWN  500
+#define SEQ_CIDMODE   10
+#define SEQ_UMMODE    11
+
+
+// 100: init, 200: dle0, 250:dle1, 300: get cid (dial), 350: "hup" (no cid), 400: hup, 500: reset, 600: dial, 700: ring
+struct reply_t gigaset_tab_nocid_m10x[]= /* with dle mode */
+{
+	/* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout, action, command */
+
+	/* initialize device, set cid mode if possible */
+	//{RSP_INIT,     -1, -1,100,                900, 0, {ACT_TEST}},
+	//{RSP_ERROR,   900,900, -1,                  0, 0, {ACT_FAILINIT}},
+	//{RSP_OK,      900,900, -1,                100, INIT_TIMEOUT,
+	//                                                  {ACT_TIMEOUT}},
+
+	{RSP_INIT,     -1, -1,SEQ_INIT,           100, INIT_TIMEOUT,
+	                                                  {ACT_TIMEOUT}},                /* wait until device is ready */
+
+	{EV_TIMEOUT,  100,100, -1,                101, 3, {0},             "Z\r"},       /* device in transparent mode? try to initialize it. */
+	{RSP_OK,      101,103, -1,                120, 5, {ACT_GETSTRING}, "+GMR\r"},    /* get version */
+
+	{EV_TIMEOUT,  101,101, -1,                102, 5, {0},             "Z\r"},       /* timeout => try once again. */
+	{RSP_ERROR,   101,101, -1,                102, 5, {0},             "Z\r"},       /* error => try once again. */
+
+	{EV_TIMEOUT,  102,102, -1,                108, 5, {ACT_SETDLE1},   "^SDLE=0\r"}, /* timeout => try again in DLE mode. */
+	{RSP_OK,      108,108, -1,                104,-1},
+	{RSP_ZDLE,    104,104,  0,                103, 5, {0},             "Z\r"},
+	{EV_TIMEOUT,  104,104, -1,                  0, 0, {ACT_FAILINIT}},
+	{RSP_ERROR,   108,108, -1,                  0, 0, {ACT_FAILINIT}},
+
+	{EV_TIMEOUT,  108,108, -1,                105, 2, {ACT_SETDLE0,
+	                                                   ACT_HUPMODEM,
+	                                                   ACT_TIMEOUT}},                /* still timeout => connection in unimodem mode? */
+	{EV_TIMEOUT,  105,105, -1,                103, 5, {0},             "Z\r"},
+
+	{RSP_ERROR,   102,102, -1,                107, 5, {0},             "^GETPRE\r"}, /* ERROR on ATZ => maybe in config mode? */
+	{RSP_OK,      107,107, -1,                  0, 0, {ACT_CONFIGMODE}},
+	{RSP_ERROR,   107,107, -1,                  0, 0, {ACT_FAILINIT}},
+	{EV_TIMEOUT,  107,107, -1,                  0, 0, {ACT_FAILINIT}},
+
+	{RSP_ERROR,   103,103, -1,                  0, 0, {ACT_FAILINIT}},
+	{EV_TIMEOUT,  103,103, -1,                  0, 0, {ACT_FAILINIT}},
+
+	{RSP_STRING,  120,120, -1,                121,-1, {ACT_SETVER}},
+
+	{EV_TIMEOUT,  120,121, -1,                  0, 0, {ACT_FAILVER, ACT_INIT}},
+	{RSP_ERROR,   120,121, -1,                  0, 0, {ACT_FAILVER, ACT_INIT}},
+	{RSP_OK,      121,121, -1,                  0, 0, {ACT_GOTVER,  ACT_INIT}},
+#if 0
+	{EV_TIMEOUT,  120,121, -1,                130, 5, {ACT_FAILVER},   "^SGCI=1\r"},
+	{RSP_ERROR,   120,121, -1,                130, 5, {ACT_FAILVER},   "^SGCI=1\r"},
+	{RSP_OK,      121,121, -1,                130, 5, {ACT_GOTVER},    "^SGCI=1\r"},
+
+	{RSP_OK,      130,130, -1,                  0, 0, {ACT_INIT}},
+	{RSP_ERROR,   130,130, -1,                  0, 0, {ACT_FAILINIT}},
+	{EV_TIMEOUT,  130,130, -1,                  0, 0, {ACT_FAILINIT}},
+#endif
+
+	/* leave dle mode */
+	{RSP_INIT,      0,  0,SEQ_DLE0,           201, 5, {0},             "^SDLE=0\r"},
+	{RSP_OK,      201,201, -1,                202,-1},
+	//{RSP_ZDLE,    202,202,  0,                202, 0, {ACT_ERROR}},//DELETE
+	{RSP_ZDLE,    202,202,  0,                  0, 0, {ACT_DLE0}},
+	{RSP_NODEV,   200,249, -1,                  0, 0, {ACT_FAKEDLE0}},
+	{RSP_ERROR,   200,249, -1,                  0, 0, {ACT_FAILDLE0}},
+	{EV_TIMEOUT,  200,249, -1,                  0, 0, {ACT_FAILDLE0}},
+
+	/* enter dle mode */
+	{RSP_INIT,      0,  0,SEQ_DLE1,           251, 5, {0},             "^SDLE=1\r"},
+	{RSP_OK,      251,251, -1,                252,-1},
+	{RSP_ZDLE,    252,252,  1,                  0, 0, {ACT_DLE1}},
+	{RSP_ERROR,   250,299, -1,                  0, 0, {ACT_FAILDLE1}},
+	{EV_TIMEOUT,  250,299, -1,                  0, 0, {ACT_FAILDLE1}},
+
+	/* incoming call */
+	{RSP_RING,     -1, -1, -1,                 -1,-1, {ACT_RING}},
+
+	/* get cid */
+	//{RSP_INIT,      0,  0,300,                901, 0, {ACT_TEST}},
+	//{RSP_ERROR,   901,901, -1,                  0, 0, {ACT_FAILCID}},
+	//{RSP_OK,      901,901, -1,                301, 5, {0},             "^SGCI?\r"},
+
+	{RSP_INIT,      0,  0,SEQ_CID,            301, 5, {0},             "^SGCI?\r"},
+	{RSP_OK,      301,301, -1,                302,-1},
+	{RSP_ZGCI,    302,302, -1,                  0, 0, {ACT_CID}},
+	{RSP_ERROR,   301,349, -1,                  0, 0, {ACT_FAILCID}},
+	{EV_TIMEOUT,  301,349, -1,                  0, 0, {ACT_FAILCID}},
+
+	/* enter cid mode */
+	{RSP_INIT,      0,  0,SEQ_CIDMODE,        150, 5, {0},             "^SGCI=1\r"},
+	{RSP_OK,      150,150, -1,                  0, 0, {ACT_CMODESET}},
+	{RSP_ERROR,   150,150, -1,                  0, 0, {ACT_FAILCMODE}},
+	{EV_TIMEOUT,  150,150, -1,                  0, 0, {ACT_FAILCMODE}},
+
+	/* leave cid mode */
+	//{RSP_INIT,      0,  0,SEQ_UMMODE,         160, 5, {0},             "^SGCI=0\r"},
+	{RSP_INIT,      0,  0,SEQ_UMMODE,         160, 5, {0},             "Z\r"},
+	{RSP_OK,      160,160, -1,                  0, 0, {ACT_UMODESET}},
+	{RSP_ERROR,   160,160, -1,                  0, 0, {ACT_FAILUMODE}},
+	{EV_TIMEOUT,  160,160, -1,                  0, 0, {ACT_FAILUMODE}},
+
+	/* abort getting cid */
+	{RSP_INIT,      0,  0,SEQ_NOCID,            0, 0, {ACT_ABORTCID}},
+
+	/* reset */
+#if 0
+	{RSP_INIT,      0,  0,SEQ_SHUTDOWN,       503, 5, {0},             "^SGCI=0\r"},
+	{RSP_OK,      503,503, -1,                504, 5, {0},             "Z\r"},
+#endif
+	{RSP_INIT,      0,  0,SEQ_SHUTDOWN,       504, 5, {0},             "Z\r"},
+	{RSP_OK,      504,504, -1,                  0, 0, {ACT_SDOWN}},
+	{RSP_ERROR,   501,599, -1,                  0, 0, {ACT_FAILSDOWN}},
+	{EV_TIMEOUT,  501,599, -1,                  0, 0, {ACT_FAILSDOWN}},
+	{RSP_NODEV,   501,599, -1,                  0, 0, {ACT_FAKESDOWN}},
+
+	{EV_PROC_CIDMODE,-1, -1, -1,               -1,-1, {ACT_PROC_CIDMODE}}, //FIXME
+	{EV_IF_LOCK,   -1, -1, -1,                 -1,-1, {ACT_IF_LOCK}}, //FIXME
+	{EV_IF_VER,    -1, -1, -1,                 -1,-1, {ACT_IF_VER}}, //FIXME
+	{EV_START,     -1, -1, -1,                 -1,-1, {ACT_START}}, //FIXME
+	{EV_STOP,      -1, -1, -1,                 -1,-1, {ACT_STOP}}, //FIXME
+	{EV_SHUTDOWN,  -1, -1, -1,                 -1,-1, {ACT_SHUTDOWN}}, //FIXME
+
+	/* misc. */
+	{RSP_EMPTY,    -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZCFGT,    -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZCFG,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZLOG,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZMWI,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZABINFO,  -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZSMLSTCHG,-1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+
+	{RSP_ZCAU,     -1, -1, -1,                 -1,-1, {ACT_ZCAU}},
+	{RSP_NONE,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}},
+	{RSP_ANY,      -1, -1, -1,                 -1,-1, {ACT_WARN}},
+	{RSP_LAST}
+};
+
+// 600: start dialing, 650: dial in progress, 800: connection is up, 700: ring, 400: hup, 750: accepted icall
+struct reply_t gigaset_tab_cid_m10x[] = /* for M10x */
+{
+	/* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout, action, command */
+
+	/* dial */
+	{EV_DIAL,      -1, -1, -1,                 -1,-1, {ACT_DIAL}}, //FIXME
+	{RSP_INIT,      0,  0,SEQ_DIAL,           601, 5, {ACT_CMD+AT_BC}},
+	{RSP_OK,      601,601, -1,                602, 5, {ACT_CMD+AT_HLC}},
+	{RSP_NULL,    602,602, -1,                603, 5, {ACT_CMD+AT_PROTO}},
+	{RSP_OK,      602,602, -1,                603, 5, {ACT_CMD+AT_PROTO}},
+	{RSP_OK,      603,603, -1,                604, 5, {ACT_CMD+AT_TYPE}},
+	{RSP_OK,      604,604, -1,                605, 5, {ACT_CMD+AT_MSN}},
+	{RSP_OK,      605,605, -1,                606, 5, {ACT_CMD+AT_ISO}},
+	{RSP_NULL,    605,605, -1,                606, 5, {ACT_CMD+AT_ISO}},
+	{RSP_OK,      606,606, -1,                607, 5, {0},             "+VLS=17\r"}, /* set "Endgeraetemodus" */
+	{RSP_OK,      607,607, -1,                608,-1},
+	//{RSP_ZSAU,    608,608,ZSAU_PROCEEDING,    608, 0, {ACT_ERROR}},//DELETE
+	{RSP_ZSAU,    608,608,ZSAU_PROCEEDING,    609, 5, {ACT_CMD+AT_DIAL}},
+	{RSP_OK,      609,609, -1,                650, 0, {ACT_DIALING}},
+
+	{RSP_ZVLS,    608,608, 17,                 -1,-1, {ACT_DEBUG}},
+	{RSP_ZCTP,    609,609, -1,                 -1,-1, {ACT_DEBUG}},
+	{RSP_ZCPN,    609,609, -1,                 -1,-1, {ACT_DEBUG}},
+	{RSP_ERROR,   601,609, -1,                  0, 0, {ACT_ABORTDIAL}},
+	{EV_TIMEOUT,  601,609, -1,                  0, 0, {ACT_ABORTDIAL}},
+
+	/* dialing */
+	{RSP_ZCTP,    650,650, -1,                 -1,-1, {ACT_DEBUG}},
+	{RSP_ZCPN,    650,650, -1,                 -1,-1, {ACT_DEBUG}},
+	{RSP_ZSAU,    650,650,ZSAU_CALL_DELIVERED, -1,-1, {ACT_DEBUG}}, /* some devices don't send this */
+
+	/* connection established  */
+	{RSP_ZSAU,    650,650,ZSAU_ACTIVE,        800,-1, {ACT_CONNECT}}, //FIXME -> DLE1
+	{RSP_ZSAU,    750,750,ZSAU_ACTIVE,        800,-1, {ACT_CONNECT}}, //FIXME -> DLE1
+
+	{EV_BC_OPEN,  800,800, -1,                800,-1, {ACT_NOTIFY_BC_UP}}, //FIXME new constate + timeout
+
+	/* remote hangup */
+	{RSP_ZSAU,    650,650,ZSAU_DISCONNECT_IND,  0, 0, {ACT_REMOTEREJECT}},
+	{RSP_ZSAU,    750,750,ZSAU_DISCONNECT_IND,  0, 0, {ACT_REMOTEHUP}},
+	{RSP_ZSAU,    800,800,ZSAU_DISCONNECT_IND,  0, 0, {ACT_REMOTEHUP}},
+
+	/* hangup */
+	{EV_HUP,       -1, -1, -1,                 -1,-1, {ACT_HUP}}, //FIXME
+	{RSP_INIT,     -1, -1,SEQ_HUP,            401, 5, {0},             "+VLS=0\r"}, /* hang up */ //-1,-1?
+	{RSP_OK,      401,401, -1,                402, 5},
+	{RSP_ZVLS,    402,402,  0,                403, 5},
+	{RSP_ZSAU,    403,403,ZSAU_DISCONNECT_REQ, -1,-1, {ACT_DEBUG}}, /* if not remote hup */
+	//{RSP_ZSAU,    403,403,ZSAU_NULL,          401, 0, {ACT_ERROR}}, //DELETE//FIXME -> DLE0 // should we do this _before_ hanging up for base driver?
+	{RSP_ZSAU,    403,403,ZSAU_NULL,            0, 0, {ACT_DISCONNECT}}, //FIXME -> DLE0 // should we do this _before_ hanging up for base driver?
+	{RSP_NODEV,   401,403, -1,                  0, 0, {ACT_FAKEHUP}}, //FIXME -> DLE0 // should we do this _before_ hanging up for base driver?
+	{RSP_ERROR,   401,401, -1,                  0, 0, {ACT_ABORTHUP}},
+	{EV_TIMEOUT,  401,403, -1,                  0, 0, {ACT_ABORTHUP}},
+
+	{EV_BC_CLOSED,  0,  0, -1,                  0,-1, {ACT_NOTIFY_BC_DOWN}}, //FIXME new constate + timeout
+
+	/* ring */
+	{RSP_ZBC,     700,700, -1,                 -1,-1, {0}},
+	{RSP_ZHLC,    700,700, -1,                 -1,-1, {0}},
+	{RSP_NMBR,    700,700, -1,                 -1,-1, {0}},
+	{RSP_ZCPN,    700,700, -1,                 -1,-1, {0}},
+	{RSP_ZCTP,    700,700, -1,                 -1,-1, {0}},
+	{EV_TIMEOUT,  700,700, -1,               720,720, {ACT_ICALL}},
+	{EV_BC_CLOSED,720,720, -1,                  0,-1, {ACT_NOTIFY_BC_DOWN}},
+
+	/*accept icall*/
+	{EV_ACCEPT,    -1, -1, -1,                 -1,-1, {ACT_ACCEPT}}, //FIXME
+	{RSP_INIT,    720,720,SEQ_ACCEPT,         721, 5, {ACT_CMD+AT_PROTO}},
+	{RSP_OK,      721,721, -1,                722, 5, {ACT_CMD+AT_ISO}},
+	{RSP_OK,      722,722, -1,                723, 5, {0},             "+VLS=17\r"}, /* set "Endgeraetemodus" */
+	{RSP_OK,      723,723, -1,                724, 5, {0}},
+	{RSP_ZVLS,    724,724, 17,                750,50, {ACT_ACCEPTED}},
+	{RSP_ERROR,   721,729, -1,                  0, 0, {ACT_ABORTACCEPT}},
+	{EV_TIMEOUT,  721,729, -1,                  0, 0, {ACT_ABORTACCEPT}},
+	{RSP_ZSAU,    700,729,ZSAU_NULL,            0, 0, {ACT_ABORTACCEPT}},
+	{RSP_ZSAU,    700,729,ZSAU_ACTIVE,          0, 0, {ACT_ABORTACCEPT}},
+	{RSP_ZSAU,    700,729,ZSAU_DISCONNECT_IND,  0, 0, {ACT_ABORTACCEPT}},
+
+	{EV_TIMEOUT,  750,750, -1,                  0, 0, {ACT_CONNTIMEOUT}},
+
+	/* misc. */
+	{EV_PROTO_L2,  -1, -1, -1,                 -1,-1, {ACT_PROTO_L2}}, //FIXME
+
+	{RSP_ZCON,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZCCR,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZAOC,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+	{RSP_ZCSTR,    -1, -1, -1,                 -1,-1, {ACT_DEBUG}}, //FIXME
+
+	{RSP_ZCAU,     -1, -1, -1,                 -1,-1, {ACT_ZCAU}},
+	{RSP_NONE,     -1, -1, -1,                 -1,-1, {ACT_DEBUG}},
+	{RSP_ANY,      -1, -1, -1,                 -1,-1, {ACT_WARN}},
+	{RSP_LAST}
+};
+
+
+#if 0
+static struct reply_t tab_nocid[]= /* no dle mode */ //FIXME aenderungen uebernehmen
+{
+	/* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout, action, command */
+
+	{RSP_ANY,      -1, -1, -1,                 -1,-1, ACT_WARN,         NULL},
+	{RSP_LAST,0,0,0,0,0,0}
+};
+
+static struct reply_t tab_cid[] = /* no dle mode */ //FIXME aenderungen uebernehmen
+{
+	/* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout, action, command */
+
+	{RSP_ANY,      -1, -1, -1,                 -1,-1, ACT_WARN,         NULL},
+	{RSP_LAST,0,0,0,0,0,0}
+};
+#endif
+
+static struct resp_type_t resp_type[]=
+{
+	/*{"",          RSP_EMPTY,  RT_NOTHING},*/
+	{"OK",        RSP_OK,     RT_NOTHING},
+	{"ERROR",     RSP_ERROR,  RT_NOTHING},
+	{"ZSAU",      RSP_ZSAU,   RT_ZSAU},
+	{"ZCAU",      RSP_ZCAU,   RT_ZCAU},
+	{"RING",      RSP_RING,   RT_RING},
+	{"ZGCI",      RSP_ZGCI,   RT_NUMBER},
+	{"ZVLS",      RSP_ZVLS,   RT_NUMBER},
+	{"ZCTP",      RSP_ZCTP,   RT_NUMBER},
+	{"ZDLE",      RSP_ZDLE,   RT_NUMBER},
+	{"ZCFGT",     RSP_ZCFGT,  RT_NUMBER},
+	{"ZCCR",      RSP_ZCCR,   RT_NUMBER},
+	{"ZMWI",      RSP_ZMWI,   RT_NUMBER},
+	{"ZHLC",      RSP_ZHLC,   RT_STRING},
+	{"ZBC",       RSP_ZBC,    RT_STRING},
+	{"NMBR",      RSP_NMBR,   RT_STRING},
+	{"ZCPN",      RSP_ZCPN,   RT_STRING},
+	{"ZCON",      RSP_ZCON,   RT_STRING},
+	{"ZAOC",      RSP_ZAOC,   RT_STRING},
+	{"ZCSTR",     RSP_ZCSTR,  RT_STRING},
+	{"ZCFG",      RSP_ZCFG,   RT_HEX},
+	{"ZLOG",      RSP_ZLOG,   RT_NOTHING},
+	{"ZABINFO",   RSP_ZABINFO, RT_NOTHING},
+	{"ZSMLSTCHG", RSP_ZSMLSTCHG, RT_NOTHING},
+	{NULL,0,0}
+};
+
+/*
+ * Get integer from char-pointer
+ */
+static int isdn_getnum(char *p)
+{
+	int v = -1;
+
+	IFNULLRETVAL(p, -1);
+
+	dbg(DEBUG_TRANSCMD, "string: %s", p);
+
+	while (*p >= '0' && *p <= '9')
+		v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p++) - '0');
+	if (*p)
+		v = -1; /* invalid Character */
+	return v;
+}
+
+/*
+ * Get integer from char-pointer
+ */
+static int isdn_gethex(char *p)
+{
+	int v = 0;
+	int c;
+
+	IFNULLRETVAL(p, -1);
+
+	dbg(DEBUG_TRANSCMD, "string: %s", p);
+
+	if (!*p)
+		return -1;
+
+	do {
+		if (v > (INT_MAX - 15) / 16)
+			return -1;
+		c = *p;
+		if (c >= '0' && c <= '9')
+			c -= '0';
+		else if (c >= 'a' && c <= 'f')
+			c -= 'a' - 10;
+		else if (c >= 'A' && c <= 'F')
+			c -= 'A' - 10;
+		else
+			return -1;
+		v = v * 16 + c;
+	} while (*++p);
+
+	return v;
+}
+
+static inline void new_index(atomic_t *index, int max)
+{
+	if (atomic_read(index) == max)	//FIXME race?
+		atomic_set(index, 0);
+	else
+		atomic_inc(index);
+}
+
+/* retrieve CID from parsed response
+ * returns 0 if no CID, -1 if invalid CID, or CID value 1..65535
+ */
+static int cid_of_response(char *s)
+{
+	int cid;
+
+	if (s[-1] != ';')
+		return 0;	/* no CID separator */
+	cid = isdn_getnum(s);
+	if (cid < 0)
+		return 0;	/* CID not numeric */
+	if (cid < 1 || cid > 65535)
+		return -1;	/* CID out of range */
+	return cid;
+	//FIXME is ;<digit>+ at end of non-CID response really impossible?
+}
+
+/* This function will be called via task queue from the callback handler.
+ * We received a modem response and have to handle it..
+ */
+void gigaset_handle_modem_response(struct cardstate *cs)
+{
+	unsigned char *argv[MAX_REC_PARAMS + 1];
+	int params;
+	int i, j;
+	struct resp_type_t *rt;
+	int curarg;
+	unsigned long flags;
+	unsigned next, tail, head;
+	struct event_t *event;
+	int resp_code;
+	int param_type;
+	int abort;
+	size_t len;
+	int cid;
+	int rawstring;
+
+	IFNULLRET(cs);
+
+	len = cs->cbytes;
+	if (!len) {
+		/* ignore additional LFs/CRs (M10x config mode or cx100) */
+		dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[len]);
+		return;
+	}
+	cs->respdata[len] = 0;
+	dbg(DEBUG_TRANSCMD, "raw string: '%s'", cs->respdata);
+	argv[0] = cs->respdata;
+	params = 1;
+	if (cs->at_state.getstring) {
+		/* getstring only allowed without cid at the moment */
+		cs->at_state.getstring = 0;
+		rawstring = 1;
+		cid = 0;
+	} else {
+		/* parse line */
+		for (i = 0; i < len; i++)
+			switch (cs->respdata[i]) {
+			case ';':
+			case ',':
+			case '=':
+				if (params > MAX_REC_PARAMS) {
+					warn("too many parameters in response");
+					/* need last parameter (might be CID) */
+					params--;
+				}
+				argv[params++] = cs->respdata + i + 1;
+			}
+
+		rawstring = 0;
+		cid = params > 1 ? cid_of_response(argv[params-1]) : 0;
+		if (cid < 0) {
+			gigaset_add_event(cs, &cs->at_state, RSP_INVAL,
+			                  NULL, 0, NULL);
+			return;
+		}
+
+		for (j = 1; j < params; ++j)
+			argv[j][-1] = 0;
+
+		dbg(DEBUG_TRANSCMD, "CMD received: %s", argv[0]);
+		if (cid) {
+			--params;
+			dbg(DEBUG_TRANSCMD, "CID: %s", argv[params]);
+		}
+		dbg(DEBUG_TRANSCMD, "available params: %d", params - 1);
+		for (j = 1; j < params; j++)
+			dbg(DEBUG_TRANSCMD, "param %d: %s", j, argv[j]);
+	}
+
+	spin_lock_irqsave(&cs->ev_lock, flags);
+	head = atomic_read(&cs->ev_head);
+	tail = atomic_read(&cs->ev_tail);
+
+	abort = 1;
+	curarg = 0;
+	while (curarg < params) {
+		next = (tail + 1) % MAX_EVENTS;
+		if (unlikely(next == head)) {
+			err("event queue full");
+			break;
+		}
+
+		event = cs->events + tail;
+		event->at_state = NULL;
+		event->cid = cid;
+		event->ptr = NULL;
+		event->arg = NULL;
+		tail = next;
+
+		if (rawstring) {
+			resp_code = RSP_STRING;
+			param_type = RT_STRING;
+		} else {
+			for (rt = resp_type; rt->response; ++rt)
+				if (!strcmp(argv[curarg], rt->response))
+					break;
+
+			if (!rt->response) {
+				event->type = RSP_UNKNOWN;
+				warn("unknown modem response: %s",
+				     argv[curarg]);
+				break;
+			}
+
+			resp_code = rt->resp_code;
+			param_type = rt->type;
+			++curarg;
+		}
+
+		event->type = resp_code;
+
+		switch (param_type) {
+		case RT_NOTHING:
+			break;
+		case RT_RING:
+			if (!cid) {
+				err("received RING without CID!");
+				event->type = RSP_INVAL;
+				abort = 1;
+			} else {
+				event->cid = 0;
+				event->parameter = cid;
+				abort = 0;
+			}
+			break;
+		case RT_ZSAU:
+			if (curarg >= params) {
+				event->parameter = ZSAU_NONE;
+				break;
+			}
+			if (!strcmp(argv[curarg], "OUTGOING_CALL_PROCEEDING"))
+				event->parameter = ZSAU_OUTGOING_CALL_PROCEEDING;
+			else if (!strcmp(argv[curarg], "CALL_DELIVERED"))
+				event->parameter = ZSAU_CALL_DELIVERED;
+			else if (!strcmp(argv[curarg], "ACTIVE"))
+				event->parameter = ZSAU_ACTIVE;
+			else if (!strcmp(argv[curarg], "DISCONNECT_IND"))
+				event->parameter = ZSAU_DISCONNECT_IND;
+			else if (!strcmp(argv[curarg], "NULL"))
+				event->parameter = ZSAU_NULL;
+			else if (!strcmp(argv[curarg], "DISCONNECT_REQ"))
+				event->parameter = ZSAU_DISCONNECT_REQ;
+			else {
+				event->parameter = ZSAU_UNKNOWN;
+				warn("%s: unknown parameter %s after ZSAU",
+				     __func__, argv[curarg]);
+			}
+			++curarg;
+			break;
+		case RT_STRING:
+			if (curarg < params) {
+				len = strlen(argv[curarg]) + 1;
+				event->ptr = kmalloc(len, GFP_ATOMIC);
+				if (event->ptr)
+					memcpy(event->ptr, argv[curarg], len);
+				else
+					err("no memory for string!");
+				++curarg;
+			}
+#ifdef CONFIG_GIGASET_DEBUG
+			if (!event->ptr)
+				dbg(DEBUG_CMD, "string==NULL");
+			else
+				dbg(DEBUG_CMD,
+				    "string==%s", (char *) event->ptr);
+#endif
+			break;
+		case RT_ZCAU:
+			event->parameter = -1;
+			if (curarg + 1 < params) {
+				i = isdn_gethex(argv[curarg]);
+				j = isdn_gethex(argv[curarg + 1]);
+				if (i >= 0 && i < 256 && j >= 0 && j < 256)
+					event->parameter = (unsigned) i << 8
+					                   | j;
+				curarg += 2;
+			} else
+				curarg = params - 1;
+			break;
+		case RT_NUMBER:
+		case RT_HEX:
+			if (curarg < params) {
+				if (param_type == RT_HEX)
+					event->parameter =
+						isdn_gethex(argv[curarg]);
+				else
+					event->parameter =
+						isdn_getnum(argv[curarg]);
+				++curarg;
+			} else
+				event->parameter = -1;
+#ifdef CONFIG_GIGASET_DEBUG
+			dbg(DEBUG_CMD, "parameter==%d", event->parameter);
+#endif
+			break;
+		}
+
+		if (resp_code == RSP_ZDLE)
+			cs->dle = event->parameter;
+
+		if (abort)
+			break;
+	}
+
+	atomic_set(&cs->ev_tail, tail);
+	spin_unlock_irqrestore(&cs->ev_lock, flags);
+
+	if (curarg != params)
+		dbg(DEBUG_ANY, "invalid number of processed parameters: %d/%d",
+		    curarg, params);
+}
+EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
+
+/* disconnect
+ * process closing of connection associated with given AT state structure
+ */
+static void disconnect(struct at_state_t **at_state_p)
+{
+	unsigned long flags;
+	struct bc_state *bcs;
+	struct cardstate *cs;
+
+	IFNULLRET(at_state_p);
+	IFNULLRET(*at_state_p);
+	bcs = (*at_state_p)->bcs;
+	cs = (*at_state_p)->cs;
+	IFNULLRET(cs);
+
+	new_index(&(*at_state_p)->seq_index, MAX_SEQ_INDEX);
+
+	/* revert to selected idle mode */
+	if (!atomic_read(&cs->cidmode)) {
+		cs->at_state.pending_commands |= PC_UMMODE;
+		atomic_set(&cs->commands_pending, 1); //FIXME
+		dbg(DEBUG_CMD, "Scheduling PC_UMMODE");
+	}
+
+	if (bcs) {
+		/* B channel assigned: invoke hardware specific handler */
+		cs->ops->close_bchannel(bcs);
+	} else {
+		/* no B channel assigned: just deallocate */
+		spin_lock_irqsave(&cs->lock, flags);
+		list_del(&(*at_state_p)->list);
+		kfree(*at_state_p);
+		*at_state_p = NULL;
+		spin_unlock_irqrestore(&cs->lock, flags);
+	}
+}
+
+/* get_free_channel
+ * get a free AT state structure: either one of those associated with the
+ * B channels of the Gigaset device, or if none of those is available,
+ * a newly allocated one with bcs=NULL
+ * The structure should be freed by calling disconnect() after use.
+ */
+static inline struct at_state_t *get_free_channel(struct cardstate *cs,
+                                                  int cid)
+/* cids: >0: siemens-cid
+	  0: without cid
+	 -1: no cid assigned yet
+*/
+{
+	unsigned long flags;
+	int i;
+	struct at_state_t *ret;
+
+	for (i = 0; i < cs->channels; ++i)
+		if (gigaset_get_channel(cs->bcs + i)) {
+			ret = &cs->bcs[i].at_state;
+			ret->cid = cid;
+			return ret;
+		}
+
+	spin_lock_irqsave(&cs->lock, flags);
+	ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
+	if (ret) {
+		gigaset_at_init(ret, NULL, cs, cid);
+		list_add(&ret->list, &cs->temp_at_states);
+	}
+	spin_unlock_irqrestore(&cs->lock, flags);
+	return ret;
+}
+
+static void init_failed(struct cardstate *cs, int mode)
+{
+	int i;
+	struct at_state_t *at_state;
+
+	cs->at_state.pending_commands &= ~PC_INIT;
+	atomic_set(&cs->mode, mode);
+	atomic_set(&cs->mstate, MS_UNINITIALIZED);
+	gigaset_free_channels(cs);
+	for (i = 0; i < cs->channels; ++i) {
+		at_state = &cs->bcs[i].at_state;
+		if (at_state->pending_commands & PC_CID) {
+			at_state->pending_commands &= ~PC_CID;
+			at_state->pending_commands |= PC_NOCID;
+			atomic_set(&cs->commands_pending, 1);
+		}
+	}
+}
+
+static void schedule_init(struct cardstate *cs, int state)
+{
+	if (cs->at_state.pending_commands & PC_INIT) {
+		dbg(DEBUG_CMD, "not scheduling PC_INIT again");
+		return;
+	}
+	atomic_set(&cs->mstate, state);
+	atomic_set(&cs->mode, M_UNKNOWN);
+	gigaset_block_channels(cs);
+	cs->at_state.pending_commands |= PC_INIT;
+	atomic_set(&cs->commands_pending, 1);
+	dbg(DEBUG_CMD, "Scheduling PC_INIT");
+}
+
+/* Add "AT" to a command, add the cid, dle encode it, send the result to the hardware. */
+static void send_command(struct cardstate *cs, const char *cmd, int cid,
+                         int dle, gfp_t kmallocflags)
+{
+	size_t cmdlen, buflen;
+	char *cmdpos, *cmdbuf, *cmdtail;
+
+	cmdlen = strlen(cmd);
+	buflen = 11 + cmdlen;
+
+	if (likely(buflen > cmdlen)) {
+		cmdbuf = kmalloc(buflen, kmallocflags);
+		if (likely(cmdbuf != NULL)) {
+			cmdpos = cmdbuf + 9;
+			cmdtail = cmdpos + cmdlen;
+			memcpy(cmdpos, cmd, cmdlen);
+
+			if (cid > 0 && cid <= 65535) {
+				do {
+					*--cmdpos = '0' + cid % 10;
+					cid /= 10;
+					++cmdlen;
+				} while (cid);
+			}
+
+			cmdlen += 2;
+			*--cmdpos = 'T';
+			*--cmdpos = 'A';
+
+			if (dle) {
+				cmdlen += 4;
+				*--cmdpos = '(';
+				*--cmdpos = 0x10;
+				*cmdtail++ = 0x10;
+				*cmdtail++ = ')';
+			}
+
+			cs->ops->write_cmd(cs, cmdpos, cmdlen, NULL);
+			kfree(cmdbuf);
+		} else
+			err("no memory for command buffer");
+	} else
+		err("overflow in buflen");
+}
+
+static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
+{
+	struct at_state_t *at_state;
+	int i;
+	unsigned long flags;
+
+	if (cid == 0)
+		return &cs->at_state;
+
+	for (i = 0; i < cs->channels; ++i)
+		if (cid == cs->bcs[i].at_state.cid)
+			return &cs->bcs[i].at_state;
+
+	spin_lock_irqsave(&cs->lock, flags);
+
+	list_for_each_entry(at_state, &cs->temp_at_states, list)
+		if (cid == at_state->cid) {
+			spin_unlock_irqrestore(&cs->lock, flags);
+			return at_state;
+		}
+
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	return NULL;
+}
+
+static void bchannel_down(struct bc_state *bcs)
+{
+	IFNULLRET(bcs);
+	IFNULLRET(bcs->cs);
+
+	if (bcs->chstate & CHS_B_UP) {
+		bcs->chstate &= ~CHS_B_UP;
+		gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP);
+	}
+
+	if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
+		bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
+		gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
+	}
+
+	gigaset_free_channel(bcs);
+
+	gigaset_bcs_reinit(bcs);
+}
+
+static void bchannel_up(struct bc_state *bcs)
+{
+	IFNULLRET(bcs);
+
+	if (!(bcs->chstate & CHS_D_UP)) {
+		notice("%s: D channel not up", __func__);
+		bcs->chstate |= CHS_D_UP;
+		gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
+	}
+
+	if (bcs->chstate & CHS_B_UP) {
+		notice("%s: B channel already up", __func__);
+		return;
+	}
+
+	bcs->chstate |= CHS_B_UP;
+	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN);
+}
+
+static void start_dial(struct at_state_t *at_state, void *data, int seq_index)
+{
+	struct bc_state *bcs = at_state->bcs;
+	struct cardstate *cs = at_state->cs;
+	int retval;
+
+	bcs->chstate |= CHS_NOTIFY_LL;
+	//atomic_set(&bcs->status, BCS_INIT);
+
+	if (atomic_read(&at_state->seq_index) != seq_index)
+		goto error;
+
+	retval = gigaset_isdn_setup_dial(at_state, data);
+	if (retval != 0)
+		goto error;
+
+
+	at_state->pending_commands |= PC_CID;
+	dbg(DEBUG_CMD, "Scheduling PC_CID");
+//#ifdef GIG_MAYINITONDIAL
+//	if (atomic_read(&cs->MState) == MS_UNKNOWN) {
+//		cs->at_state.pending_commands |= PC_INIT;
+//		dbg(DEBUG_CMD, "Scheduling PC_INIT");
+//	}
+//#endif
+	atomic_set(&cs->commands_pending, 1); //FIXME
+	return;
+
+error:
+	at_state->pending_commands |= PC_NOCID;
+	dbg(DEBUG_CMD, "Scheduling PC_NOCID");
+	atomic_set(&cs->commands_pending, 1); //FIXME
+	return;
+}
+
+static void start_accept(struct at_state_t *at_state)
+{
+	struct cardstate *cs = at_state->cs;
+	int retval;
+
+	retval = gigaset_isdn_setup_accept(at_state);
+
+	if (retval == 0) {
+		at_state->pending_commands |= PC_ACCEPT;
+		dbg(DEBUG_CMD, "Scheduling PC_ACCEPT");
+		atomic_set(&cs->commands_pending, 1); //FIXME
+	} else {
+		//FIXME
+		at_state->pending_commands |= PC_HUP;
+		dbg(DEBUG_CMD, "Scheduling PC_HUP");
+		atomic_set(&cs->commands_pending, 1); //FIXME
+	}
+}
+
+static void do_start(struct cardstate *cs)
+{
+	gigaset_free_channels(cs);
+
+	if (atomic_read(&cs->mstate) != MS_LOCKED)
+		schedule_init(cs, MS_INIT);
+
+	gigaset_i4l_cmd(cs, ISDN_STAT_RUN);
+	                                // FIXME: not in locked mode
+	                                // FIXME 2: only after init sequence
+
+	cs->waiting = 0;
+	wake_up(&cs->waitqueue);
+}
+
+static void finish_shutdown(struct cardstate *cs)
+{
+	if (atomic_read(&cs->mstate) != MS_LOCKED) {
+		atomic_set(&cs->mstate, MS_UNINITIALIZED);
+		atomic_set(&cs->mode, M_UNKNOWN);
+	}
+
+	/* The rest is done by cleanup_cs () in user mode. */
+
+	cs->cmd_result = -ENODEV;
+	cs->waiting = 0;
+	wake_up_interruptible(&cs->waitqueue);
+}
+
+static void do_shutdown(struct cardstate *cs)
+{
+	gigaset_block_channels(cs);
+
+	if (atomic_read(&cs->mstate) == MS_READY) {
+		atomic_set(&cs->mstate, MS_SHUTDOWN);
+		cs->at_state.pending_commands |= PC_SHUTDOWN;
+		atomic_set(&cs->commands_pending, 1); //FIXME
+		dbg(DEBUG_CMD, "Scheduling PC_SHUTDOWN"); //FIXME
+		//gigaset_schedule_event(cs); //FIXME
+	} else
+		finish_shutdown(cs);
+}
+
+static void do_stop(struct cardstate *cs)
+{
+	do_shutdown(cs);
+}
+
+/* Entering cid mode or getting a cid failed:
+ * try to initialize the device and try again.
+ *
+ * channel >= 0: getting cid for the channel failed
+ * channel < 0:  entering cid mode failed
+ *
+ * returns 0 on failure
+ */
+static int reinit_and_retry(struct cardstate *cs, int channel)
+{
+	int i;
+
+	if (--cs->retry_count <= 0)
+		return 0;
+
+	for (i = 0; i < cs->channels; ++i)
+		if (cs->bcs[i].at_state.cid > 0)
+			return 0;
+
+	if (channel < 0)
+		warn("Could not enter cid mode. Reinit device and try again.");
+	else {
+		warn("Could not get a call id. Reinit device and try again.");
+		cs->bcs[channel].at_state.pending_commands |= PC_CID;
+	}
+	schedule_init(cs, MS_INIT);
+	return 1;
+}
+
+static int at_state_invalid(struct cardstate *cs,
+                            struct at_state_t *test_ptr)
+{
+	unsigned long flags;
+	unsigned channel;
+	struct at_state_t *at_state;
+	int retval = 0;
+
+	spin_lock_irqsave(&cs->lock, flags);
+
+	if (test_ptr == &cs->at_state)
+		goto exit;
+
+	list_for_each_entry(at_state, &cs->temp_at_states, list)
+		if (at_state == test_ptr)
+			goto exit;
+
+	for (channel = 0; channel < cs->channels; ++channel)
+		if (&cs->bcs[channel].at_state == test_ptr)
+			goto exit;
+
+	retval = 1;
+exit:
+	spin_unlock_irqrestore(&cs->lock, flags);
+	return retval;
+}
+
+static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
+			 struct at_state_t **p_at_state)
+{
+	int retval;
+	struct at_state_t *at_state = *p_at_state;
+
+	retval = gigaset_isdn_icall(at_state);
+	switch (retval) {
+	case ICALL_ACCEPT:
+		break;
+	default:
+		err("internal error: disposition=%d", retval);
+		/* --v-- fall through --v-- */
+	case ICALL_IGNORE:
+	case ICALL_REJECT:
+		/* hang up actively
+		 * Device doc says that would reject the call.
+		 * In fact it doesn't.
+		 */
+		at_state->pending_commands |= PC_HUP;
+		atomic_set(&cs->commands_pending, 1);
+		break;
+	}
+}
+
+static int do_lock(struct cardstate *cs)
+{
+	int mode;
+	int i;
+
+	switch (atomic_read(&cs->mstate)) {
+	case MS_UNINITIALIZED:
+	case MS_READY:
+		if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
+		    cs->at_state.pending_commands)
+			return -EBUSY;
+
+		for (i = 0; i < cs->channels; ++i)
+			if (cs->bcs[i].at_state.pending_commands)
+				return -EBUSY;
+
+		if (!gigaset_get_channels(cs))
+			return -EBUSY;
+
+		break;
+	case MS_LOCKED:
+		//retval = -EACCES;
+		break;
+	default:
+		return -EBUSY;
+	}
+
+	mode = atomic_read(&cs->mode);
+	atomic_set(&cs->mstate, MS_LOCKED);
+	atomic_set(&cs->mode, M_UNKNOWN);
+	//FIXME reset card state / at states / bcs states
+
+	return mode;
+}
+
+static int do_unlock(struct cardstate *cs)
+{
+	if (atomic_read(&cs->mstate) != MS_LOCKED)
+		return -EINVAL;
+
+	atomic_set(&cs->mstate, MS_UNINITIALIZED);
+	atomic_set(&cs->mode, M_UNKNOWN);
+	gigaset_free_channels(cs);
+	//FIXME reset card state / at states / bcs states
+	if (atomic_read(&cs->connected))
+		schedule_init(cs, MS_INIT);
+
+	return 0;
+}
+
+static void do_action(int action, struct cardstate *cs,
+		      struct bc_state *bcs,
+		      struct at_state_t **p_at_state, char **pp_command,
+		      int *p_genresp, int *p_resp_code,
+		      struct event_t *ev)
+{
+	struct at_state_t *at_state = *p_at_state;
+	struct at_state_t *at_state2;
+	unsigned long flags;
+
+	int channel;
+
+	unsigned char *s, *e;
+	int i;
+	unsigned long val;
+
+	switch (action) {
+	case ACT_NOTHING:
+		break;
+	case ACT_TIMEOUT:
+		at_state->waiting = 1;
+		break;
+	case ACT_INIT:
+		//FIXME setup everything
+		cs->at_state.pending_commands &= ~PC_INIT;
+		cs->cur_at_seq = SEQ_NONE;
+		atomic_set(&cs->mode, M_UNIMODEM);
+		if (!atomic_read(&cs->cidmode)) {
+			gigaset_free_channels(cs);
+			atomic_set(&cs->mstate, MS_READY);
+			break;
+		}
+		cs->at_state.pending_commands |= PC_CIDMODE;
+		atomic_set(&cs->commands_pending, 1); //FIXME
+		dbg(DEBUG_CMD, "Scheduling PC_CIDMODE");
+		break;
+	case ACT_FAILINIT:
+		warn("Could not initialize the device.");
+		cs->dle = 0;
+		init_failed(cs, M_UNKNOWN);
+		cs->cur_at_seq = SEQ_NONE;
+		break;
+	case ACT_CONFIGMODE:
+		init_failed(cs, M_CONFIG);
+		cs->cur_at_seq = SEQ_NONE;
+		break;
+	case ACT_SETDLE1:
+		cs->dle = 1;
+		/* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
+		cs->inbuf[0].inputstate &=
+			~(INS_command | INS_DLE_command);
+		break;
+	case ACT_SETDLE0:
+		cs->dle = 0;
+		cs->inbuf[0].inputstate =
+			(cs->inbuf[0].inputstate & ~INS_DLE_command)
+			| INS_command;
+		break;
+	case ACT_CMODESET:
+		if (atomic_read(&cs->mstate) == MS_INIT ||
+		    atomic_read(&cs->mstate) == MS_RECOVER) {
+			gigaset_free_channels(cs);
+			atomic_set(&cs->mstate, MS_READY);
+		}
+		atomic_set(&cs->mode, M_CID);
+		cs->cur_at_seq = SEQ_NONE;
+		break;
+	case ACT_UMODESET:
+		atomic_set(&cs->mode, M_UNIMODEM);
+		cs->cur_at_seq = SEQ_NONE;
+		break;
+	case ACT_FAILCMODE:
+		cs->cur_at_seq = SEQ_NONE;
+		if (atomic_read(&cs->mstate) == MS_INIT ||
+		    atomic_read(&cs->mstate) == MS_RECOVER) {
+			init_failed(cs, M_UNKNOWN);
+			break;
+		}
+		if (!reinit_and_retry(cs, -1))
+			schedule_init(cs, MS_RECOVER);
+		break;
+	case ACT_FAILUMODE:
+		cs->cur_at_seq = SEQ_NONE;
+		schedule_init(cs, MS_RECOVER);
+		break;
+	case ACT_HUPMODEM:
+		/* send "+++" (hangup in unimodem mode) */
+		cs->ops->write_cmd(cs, "+++", 3, NULL);
+		break;
+	case ACT_RING:
+		/* get fresh AT state structure for new CID */
+		at_state2 = get_free_channel(cs, ev->parameter);
+		if (!at_state2) {
+			warn("RING ignored: "
+			     "could not allocate channel structure");
+			break;
+		}
+
+		/* initialize AT state structure
+		 * note that bcs may be NULL if no B channel is free
+		 */
+		at_state2->ConState = 700;
+		kfree(at_state2->str_var[STR_NMBR]);
+		at_state2->str_var[STR_NMBR] = NULL;
+		kfree(at_state2->str_var[STR_ZCPN]);
+		at_state2->str_var[STR_ZCPN] = NULL;
+		kfree(at_state2->str_var[STR_ZBC]);
+		at_state2->str_var[STR_ZBC] = NULL;
+		kfree(at_state2->str_var[STR_ZHLC]);
+		at_state2->str_var[STR_ZHLC] = NULL;
+		at_state2->int_var[VAR_ZCTP] = -1;
+
+		spin_lock_irqsave(&cs->lock, flags);
+		at_state2->timer_expires = RING_TIMEOUT;
+		at_state2->timer_active = 1;
+		spin_unlock_irqrestore(&cs->lock, flags);
+		break;
+	case ACT_ICALL:
+		handle_icall(cs, bcs, p_at_state);
+		at_state = *p_at_state;
+		break;
+	case ACT_FAILSDOWN:
+		warn("Could not shut down the device.");
+		/* fall through */
+	case ACT_FAKESDOWN:
+	case ACT_SDOWN:
+		cs->cur_at_seq = SEQ_NONE;
+		finish_shutdown(cs);
+		break;
+	case ACT_CONNECT:
+		if (cs->onechannel) {
+			at_state->pending_commands |= PC_DLE1;
+			atomic_set(&cs->commands_pending, 1);
+			break;
+		}
+		bcs->chstate |= CHS_D_UP;
+		gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
+		cs->ops->init_bchannel(bcs);
+		break;
+	case ACT_DLE1:
+		cs->cur_at_seq = SEQ_NONE;
+		bcs = cs->bcs + cs->curchannel;
+
+		bcs->chstate |= CHS_D_UP;
+		gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
+		cs->ops->init_bchannel(bcs);
+		break;
+	case ACT_FAKEHUP:
+		at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
+		/* fall through */
+	case ACT_DISCONNECT:
+		cs->cur_at_seq = SEQ_NONE;
+		at_state->cid = -1;
+		if (bcs && cs->onechannel && cs->dle) {
+			/* Check for other open channels not needed:
+			 * DLE only used for M10x with one B channel.
+			 */
+			at_state->pending_commands |= PC_DLE0;
+			atomic_set(&cs->commands_pending, 1);
+		} else {
+			disconnect(p_at_state);
+			at_state = *p_at_state;
+		}
+		break;
+	case ACT_FAKEDLE0:
+		at_state->int_var[VAR_ZDLE] = 0;
+		cs->dle = 0;
+		/* fall through */
+	case ACT_DLE0:
+		cs->cur_at_seq = SEQ_NONE;
+		at_state2 = &cs->bcs[cs->curchannel].at_state;
+		disconnect(&at_state2);
+		break;
+	case ACT_ABORTHUP:
+		cs->cur_at_seq = SEQ_NONE;
+		warn("Could not hang up.");
+		at_state->cid = -1;
+		if (bcs && cs->onechannel)
+			at_state->pending_commands |= PC_DLE0;
+		else {
+			disconnect(p_at_state);
+			at_state = *p_at_state;
+		}
+		schedule_init(cs, MS_RECOVER);
+		break;
+	case ACT_FAILDLE0:
+		cs->cur_at_seq = SEQ_NONE;
+		warn("Could not leave DLE mode.");
+		at_state2 = &cs->bcs[cs->curchannel].at_state;
+		disconnect(&at_state2);
+		schedule_init(cs, MS_RECOVER);
+		break;
+	case ACT_FAILDLE1:
+		cs->cur_at_seq = SEQ_NONE;
+		warn("Could not enter DLE mode. Try to hang up.");
+		channel = cs->curchannel;
+		cs->bcs[channel].at_state.pending_commands |= PC_HUP;
+		atomic_set(&cs->commands_pending, 1);
+		break;
+
+	case ACT_CID: /* got cid; start dialing */
+		cs->cur_at_seq = SEQ_NONE;
+		channel = cs->curchannel;
+		if (ev->parameter > 0 && ev->parameter <= 65535) {
+			cs->bcs[channel].at_state.cid = ev->parameter;
+			cs->bcs[channel].at_state.pending_commands |=
+				PC_DIAL;
+			atomic_set(&cs->commands_pending, 1);
+			break;
+		}
+		/* fall through */
+	case ACT_FAILCID:
+		cs->cur_at_seq = SEQ_NONE;
+		channel = cs->curchannel;
+		if (!reinit_and_retry(cs, channel)) {
+			warn("Could not get a call id. Dialing not possible");
+			at_state2 = &cs->bcs[channel].at_state;
+			disconnect(&at_state2);
+		}
+		break;
+	case ACT_ABORTCID:
+		cs->cur_at_seq = SEQ_NONE;
+		at_state2 = &cs->bcs[cs->curchannel].at_state;
+		disconnect(&at_state2);
+		break;
+
+	case ACT_DIALING:
+	case ACT_ACCEPTED:
+		cs->cur_at_seq = SEQ_NONE;
+		break;
+
+	case ACT_ABORTACCEPT:	/* hangup/error/timeout during ICALL processing */
+		disconnect(p_at_state);
+		at_state = *p_at_state;
+		break;
+
+	case ACT_ABORTDIAL:	/* error/timeout during dial preparation */
+		cs->cur_at_seq = SEQ_NONE;
+		at_state->pending_commands |= PC_HUP;
+		atomic_set(&cs->commands_pending, 1);
+		break;
+
+	case ACT_REMOTEREJECT:	/* DISCONNECT_IND after dialling */
+	case ACT_CONNTIMEOUT:	/* timeout waiting for ZSAU=ACTIVE */
+	case ACT_REMOTEHUP:	/* DISCONNECT_IND with established connection */
+		at_state->pending_commands |= PC_HUP;
+		atomic_set(&cs->commands_pending, 1);
+		break;
+	case ACT_GETSTRING: /* warning: RING, ZDLE, ... are not handled properly any more */
+		at_state->getstring = 1;
+		break;
+	case ACT_SETVER:
+		if (!ev->ptr) {
+			*p_genresp = 1;
+			*p_resp_code = RSP_ERROR;
+			break;
+		}
+		s = ev->ptr;
+
+		if (!strcmp(s, "OK")) {
+			*p_genresp = 1;
+			*p_resp_code = RSP_ERROR;
+			break;
+		}
+
+		for (i = 0; i < 4; ++i) {
+			val = simple_strtoul(s, (char **) &e, 10);
+			if (val > INT_MAX || e == s)
+				break;
+			if (i == 3) {
+				if (*e)
+					break;
+			} else if (*e != '.')
+				break;
+			else
+				s = e + 1;
+			cs->fwver[i] = val;
+		}
+		if (i != 4) {
+			*p_genresp = 1;
+			*p_resp_code = RSP_ERROR;
+			break;
+		}
+		/*at_state->getstring = 1;*/
+		cs->gotfwver = 0;
+		break;
+	case ACT_GOTVER:
+		if (cs->gotfwver == 0) {
+			cs->gotfwver = 1;
+			dbg(DEBUG_ANY,
+			    "firmware version %02d.%03d.%02d.%02d",
+			    cs->fwver[0], cs->fwver[1],
+			    cs->fwver[2], cs->fwver[3]);
+			break;
+		}
+		/* fall through */
+	case ACT_FAILVER:
+		cs->gotfwver = -1;
+		err("could not read firmware version.");
+		break;
+#ifdef CONFIG_GIGASET_DEBUG
+	case ACT_ERROR:
+		*p_genresp = 1;
+		*p_resp_code = RSP_ERROR;
+		break;
+	case ACT_TEST:
+		{
+			static int count = 3; //2; //1;
+			*p_genresp = 1;
+			*p_resp_code = count ? RSP_ERROR : RSP_OK;
+			if (count > 0)
+				--count;
+		}
+		break;
+#endif
+	case ACT_DEBUG:
+		dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
+			__func__, ev->type, at_state->ConState);
+		break;
+	case ACT_WARN:
+		warn("%s: resp_code %d in ConState %d!",
+			__func__, ev->type, at_state->ConState);
+		break;
+	case ACT_ZCAU:
+		warn("cause code %04x in connection state %d.",
+		     ev->parameter, at_state->ConState);
+		break;
+
+	/* events from the LL */
+	case ACT_DIAL:
+		start_dial(at_state, ev->ptr, ev->parameter);
+		break;
+	case ACT_ACCEPT:
+		start_accept(at_state);
+		break;
+	case ACT_PROTO_L2:
+		dbg(DEBUG_CMD,
+		    "set protocol to %u", (unsigned) ev->parameter);
+		at_state->bcs->proto2 = ev->parameter;
+		break;
+	case ACT_HUP:
+		at_state->pending_commands |= PC_HUP;
+		atomic_set(&cs->commands_pending, 1); //FIXME
+		dbg(DEBUG_CMD, "Scheduling PC_HUP");
+		break;
+
+	/* hotplug events */
+	case ACT_STOP:
+		do_stop(cs);
+		break;
+	case ACT_START:
+		do_start(cs);
+		break;
+
+	/* events from the interface */ // FIXME without ACT_xxxx?
+	case ACT_IF_LOCK:
+		cs->cmd_result = ev->parameter ? do_lock(cs) : do_unlock(cs);
+		cs->waiting = 0;
+		wake_up(&cs->waitqueue);
+		break;
+	case ACT_IF_VER:
+		if (ev->parameter != 0)
+			cs->cmd_result = -EINVAL;
+		else if (cs->gotfwver != 1) {
+			cs->cmd_result = -ENOENT;
+		} else {
+			memcpy(ev->arg, cs->fwver, sizeof cs->fwver);
+			cs->cmd_result = 0;
+		}
+		cs->waiting = 0;
+		wake_up(&cs->waitqueue);
+		break;
+
+	/* events from the proc file system */ // FIXME without ACT_xxxx?
+	case ACT_PROC_CIDMODE:
+		if (ev->parameter != atomic_read(&cs->cidmode)) {
+			atomic_set(&cs->cidmode, ev->parameter);
+			if (ev->parameter) {
+				cs->at_state.pending_commands |= PC_CIDMODE;
+				dbg(DEBUG_CMD, "Scheduling PC_CIDMODE");
+			} else {
+				cs->at_state.pending_commands |= PC_UMMODE;
+				dbg(DEBUG_CMD, "Scheduling PC_UMMODE");
+			}
+			atomic_set(&cs->commands_pending, 1);
+		}
+		cs->waiting = 0;
+		wake_up(&cs->waitqueue);
+		break;
+
+	/* events from the hardware drivers */
+	case ACT_NOTIFY_BC_DOWN:
+		bchannel_down(bcs);
+		break;
+	case ACT_NOTIFY_BC_UP:
+		bchannel_up(bcs);
+		break;
+	case ACT_SHUTDOWN:
+		do_shutdown(cs);
+		break;
+
+
+	default:
+		if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
+			*pp_command = at_state->bcs->commands[action - ACT_CMD];
+			if (!*pp_command) {
+				*p_genresp = 1;
+				*p_resp_code = RSP_NULL;
+			}
+		} else
+			err("%s: action==%d!", __func__, action);
+	}
+}
+
+/* State machine to do the calling and hangup procedure */
+static void process_event(struct cardstate *cs, struct event_t *ev)
+{
+	struct bc_state *bcs;
+	char *p_command = NULL;
+	struct reply_t *rep;
+	int rcode;
+	int genresp = 0;
+	int resp_code = RSP_ERROR;
+	int sendcid;
+	struct at_state_t *at_state;
+	int index;
+	int curact;
+	unsigned long flags;
+
+	IFNULLRET(cs);
+	IFNULLRET(ev);
+
+	if (ev->cid >= 0) {
+		at_state = at_state_from_cid(cs, ev->cid);
+		if (!at_state) {
+			gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
+			                  NULL, 0, NULL);
+			return;
+		}
+	} else {
+		at_state = ev->at_state;
+		if (at_state_invalid(cs, at_state)) {
+			dbg(DEBUG_ANY,
+			    "event for invalid at_state %p", at_state);
+			return;
+		}
+	}
+
+	dbg(DEBUG_CMD,
+	    "connection state %d, event %d", at_state->ConState, ev->type);
+
+	bcs = at_state->bcs;
+	sendcid = at_state->cid;
+
+	/* Setting the pointer to the dial array */
+	rep = at_state->replystruct;
+	IFNULLRET(rep);
+
+	if (ev->type == EV_TIMEOUT) {
+		if (ev->parameter != atomic_read(&at_state->timer_index)
+		    || !at_state->timer_active) {
+			ev->type = RSP_NONE; /* old timeout */
+			dbg(DEBUG_ANY, "old timeout");
+		} else if (!at_state->waiting)
+			dbg(DEBUG_ANY, "timeout occured");
+		else
+			dbg(DEBUG_ANY, "stopped waiting");
+	}
+
+	/* if the response belongs to a variable in at_state->int_var[VAR_XXXX] or at_state->str_var[STR_XXXX], set it */
+	if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
+		index = ev->type - RSP_VAR;
+		at_state->int_var[index] = ev->parameter;
+	} else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
+		index = ev->type - RSP_STR;
+		kfree(at_state->str_var[index]);
+		at_state->str_var[index] = ev->ptr;
+		ev->ptr = NULL; /* prevent process_events() from deallocating ptr */
+	}
+
+	if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
+		at_state->getstring = 0;
+
+	/* Search row in dial array which matches modem response and current constate */
+	for (;; rep++) {
+		rcode = rep->resp_code;
+		/* dbg (DEBUG_ANY, "rcode %d", rcode); */
+		if (rcode == RSP_LAST) {
+			/* found nothing...*/
+			warn("%s: rcode=RSP_LAST: resp_code %d in ConState %d!",
+				__func__, ev->type, at_state->ConState);
+			return;
+		}
+		if ((rcode == RSP_ANY || rcode == ev->type)
+		  && ((int) at_state->ConState >= rep->min_ConState)
+		  && (rep->max_ConState < 0
+		      || (int) at_state->ConState <= rep->max_ConState)
+		  && (rep->parameter < 0 || rep->parameter == ev->parameter))
+			break;
+	}
+
+	p_command = rep->command;
+
+	at_state->waiting = 0;
+	for (curact = 0; curact < MAXACT; ++curact) {
+		/* The row tells us what we should do  ..
+		 */
+		do_action(rep->action[curact], cs, bcs, &at_state, &p_command, &genresp, &resp_code, ev);
+		if (!at_state)
+			break; /* may be freed after disconnect */
+	}
+
+	if (at_state) {
+		/* Jump to the next con-state regarding the array */
+		if (rep->new_ConState >= 0)
+			at_state->ConState = rep->new_ConState;
+
+		if (genresp) {
+			spin_lock_irqsave(&cs->lock, flags);
+			at_state->timer_expires = 0; //FIXME
+			at_state->timer_active = 0; //FIXME
+			spin_unlock_irqrestore(&cs->lock, flags);
+			gigaset_add_event(cs, at_state, resp_code, NULL, 0, NULL);
+		} else {
+			/* Send command to modem if not NULL... */
+			if (p_command/*rep->command*/) {
+				if (atomic_read(&cs->connected))
+					send_command(cs, p_command,
+					             sendcid, cs->dle,
+					             GFP_ATOMIC);
+				else
+					gigaset_add_event(cs, at_state,
+					                  RSP_NODEV,
+					                  NULL, 0, NULL);
+			}
+
+			spin_lock_irqsave(&cs->lock, flags);
+			if (!rep->timeout) {
+				at_state->timer_expires = 0;
+				at_state->timer_active = 0;
+			} else if (rep->timeout > 0) { /* new timeout */
+				at_state->timer_expires = rep->timeout * 10;
+				at_state->timer_active = 1;
+				new_index(&at_state->timer_index,
+				          MAX_TIMER_INDEX);
+			}
+			spin_unlock_irqrestore(&cs->lock, flags);
+		}
+	}
+}
+
+static void schedule_sequence(struct cardstate *cs,
+			      struct at_state_t *at_state, int sequence)
+{
+	cs->cur_at_seq = sequence;
+	gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
+}
+
+static void process_command_flags(struct cardstate *cs)
+{
+	struct at_state_t *at_state = NULL;
+	struct bc_state *bcs;
+	int i;
+	int sequence;
+
+	IFNULLRET(cs);
+
+	atomic_set(&cs->commands_pending, 0);
+
+	if (cs->cur_at_seq) {
+		dbg(DEBUG_CMD, "not searching scheduled commands: busy");
+		return;
+	}
+
+	dbg(DEBUG_CMD, "searching scheduled commands");
+
+	sequence = SEQ_NONE;
+
+	/* clear pending_commands and hangup channels on shutdown */
+	if (cs->at_state.pending_commands & PC_SHUTDOWN) {
+		cs->at_state.pending_commands &= ~PC_CIDMODE;
+		for (i = 0; i < cs->channels; ++i) {
+			bcs = cs->bcs + i;
+			at_state = &bcs->at_state;
+			at_state->pending_commands &=
+				~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
+			if (at_state->cid > 0)
+				at_state->pending_commands |= PC_HUP;
+			if (at_state->pending_commands & PC_CID) {
+				at_state->pending_commands |= PC_NOCID;
+				at_state->pending_commands &= ~PC_CID;
+			}
+		}
+	}
+
+	/* clear pending_commands and hangup channels on reset */
+	if (cs->at_state.pending_commands & PC_INIT) {
+		cs->at_state.pending_commands &= ~PC_CIDMODE;
+		for (i = 0; i < cs->channels; ++i) {
+			bcs = cs->bcs + i;
+			at_state = &bcs->at_state;
+			at_state->pending_commands &=
+				~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
+			if (at_state->cid > 0)
+				at_state->pending_commands |= PC_HUP;
+			if (atomic_read(&cs->mstate) == MS_RECOVER) {
+				if (at_state->pending_commands & PC_CID) {
+					at_state->pending_commands |= PC_NOCID;
+					at_state->pending_commands &= ~PC_CID;
+				}
+			}
+		}
+	}
+
+	/* only switch back to unimodem mode, if no commands are pending and no channels are up */
+	if (cs->at_state.pending_commands == PC_UMMODE
+	    && !atomic_read(&cs->cidmode)
+	    && list_empty(&cs->temp_at_states)
+	    && atomic_read(&cs->mode) == M_CID) {
+		sequence = SEQ_UMMODE;
+		at_state = &cs->at_state;
+		for (i = 0; i < cs->channels; ++i) {
+			bcs = cs->bcs + i;
+			if (bcs->at_state.pending_commands ||
+			    bcs->at_state.cid > 0) {
+				sequence = SEQ_NONE;
+				break;
+			}
+		}
+	}
+	cs->at_state.pending_commands &= ~PC_UMMODE;
+	if (sequence != SEQ_NONE) {
+		schedule_sequence(cs, at_state, sequence);
+		return;
+	}
+
+	for (i = 0; i < cs->channels; ++i) {
+		bcs = cs->bcs + i;
+		if (bcs->at_state.pending_commands & PC_HUP) {
+			bcs->at_state.pending_commands &= ~PC_HUP;
+			if (bcs->at_state.pending_commands & PC_CID) {
+				/* not yet dialing: PC_NOCID is sufficient */
+				bcs->at_state.pending_commands |= PC_NOCID;
+				bcs->at_state.pending_commands &= ~PC_CID;
+			} else {
+				schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
+				return;
+			}
+		}
+		if (bcs->at_state.pending_commands & PC_NOCID) {
+			bcs->at_state.pending_commands &= ~PC_NOCID;
+			cs->curchannel = bcs->channel;
+			schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
+			return;
+		} else if (bcs->at_state.pending_commands & PC_DLE0) {
+			bcs->at_state.pending_commands &= ~PC_DLE0;
+			cs->curchannel = bcs->channel;
+			schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
+			return;
+		}
+	}
+
+	list_for_each_entry(at_state, &cs->temp_at_states, list)
+		if (at_state->pending_commands & PC_HUP) {
+			at_state->pending_commands &= ~PC_HUP;
+			schedule_sequence(cs, at_state, SEQ_HUP);
+			return;
+		}
+
+	if (cs->at_state.pending_commands & PC_INIT) {
+		cs->at_state.pending_commands &= ~PC_INIT;
+		cs->dle = 0; //FIXME
+		cs->inbuf->inputstate = INS_command;
+		//FIXME reset card state (or -> LOCK0)?
+		schedule_sequence(cs, &cs->at_state, SEQ_INIT);
+		return;
+	}
+	if (cs->at_state.pending_commands & PC_SHUTDOWN) {
+		cs->at_state.pending_commands &= ~PC_SHUTDOWN;
+		schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
+		return;
+	}
+	if (cs->at_state.pending_commands & PC_CIDMODE) {
+		cs->at_state.pending_commands &= ~PC_CIDMODE;
+		if (atomic_read(&cs->mode) == M_UNIMODEM) {
+#if 0
+			cs->retry_count = 2;
+#else
+			cs->retry_count = 1;
+#endif
+			schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
+			return;
+		}
+	}
+
+	for (i = 0; i < cs->channels; ++i) {
+		bcs = cs->bcs + i;
+		if (bcs->at_state.pending_commands & PC_DLE1) {
+			bcs->at_state.pending_commands &= ~PC_DLE1;
+			cs->curchannel = bcs->channel;
+			schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
+			return;
+		}
+		if (bcs->at_state.pending_commands & PC_ACCEPT) {
+			bcs->at_state.pending_commands &= ~PC_ACCEPT;
+			schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
+			return;
+		}
+		if (bcs->at_state.pending_commands & PC_DIAL) {
+			bcs->at_state.pending_commands &= ~PC_DIAL;
+			schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
+			return;
+		}
+		if (bcs->at_state.pending_commands & PC_CID) {
+			switch (atomic_read(&cs->mode)) {
+			case M_UNIMODEM:
+				cs->at_state.pending_commands |= PC_CIDMODE;
+				dbg(DEBUG_CMD, "Scheduling PC_CIDMODE");
+				atomic_set(&cs->commands_pending, 1);
+				return;
+#ifdef GIG_MAYINITONDIAL
+			case M_UNKNOWN:
+				schedule_init(cs, MS_INIT);
+				return;
+#endif
+			}
+			bcs->at_state.pending_commands &= ~PC_CID;
+			cs->curchannel = bcs->channel;
+#ifdef GIG_RETRYCID
+			cs->retry_count = 2;
+#else
+			cs->retry_count = 1;
+#endif
+			schedule_sequence(cs, &cs->at_state, SEQ_CID);
+			return;
+		}
+	}
+}
+
+static void process_events(struct cardstate *cs)
+{
+	struct event_t *ev;
+	unsigned head, tail;
+	int i;
+	int check_flags = 0;
+	int was_busy;
+
+	/* no locking needed (only one reader) */
+	head = atomic_read(&cs->ev_head);
+
+	for (i = 0; i < 2 * MAX_EVENTS; ++i) {
+		tail = atomic_read(&cs->ev_tail);
+		if (tail == head) {
+			if (!check_flags && !atomic_read(&cs->commands_pending))
+				break;
+			check_flags = 0;
+			process_command_flags(cs);
+			tail = atomic_read(&cs->ev_tail);
+			if (tail == head) {
+				if (!atomic_read(&cs->commands_pending))
+					break;
+				continue;
+			}
+		}
+
+		ev = cs->events + head;
+		was_busy = cs->cur_at_seq != SEQ_NONE;
+		process_event(cs, ev);
+		kfree(ev->ptr);
+		ev->ptr = NULL;
+		if (was_busy && cs->cur_at_seq == SEQ_NONE)
+			check_flags = 1;
+
+		head = (head + 1) % MAX_EVENTS;
+		atomic_set(&cs->ev_head, head);
+	}
+
+	if (i == 2 * MAX_EVENTS) {
+		err("infinite loop in process_events; aborting.");
+	}
+}
+
+/* tasklet scheduled on any event received from the Gigaset device
+ * parameter:
+ *	data	ISDN controller state structure
+ */
+void gigaset_handle_event(unsigned long data)
+{
+	struct cardstate *cs = (struct cardstate *) data;
+
+	IFNULLRET(cs);
+	IFNULLRET(cs->inbuf);
+
+	/* handle incoming data on control/common channel */
+	if (atomic_read(&cs->inbuf->head) != atomic_read(&cs->inbuf->tail)) {
+		dbg(DEBUG_INTR, "processing new data");
+		cs->ops->handle_input(cs->inbuf);
+	}
+
+	process_events(cs);
+}