gigaset: add Kernel CAPI interface (v3)

Add a Kernel CAPI interface to the Gigaset driver.

Impact: optional new functionality
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2273 insertions, 0 deletions

diff --git a/drivers/isdn/gigaset/capi.c b/drivers/isdn/gigaset/capi.c
new file mode 100644
index 000000000000..c276a925b36f
--- /dev/null
+++ b/drivers/isdn/gigaset/capi.c
@@ -0,0 +1,2273 @@
+/*
+ * Kernel CAPI interface for the Gigaset driver
+ *
+ * Copyright (c) 2009 by 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.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/ctype.h>
+#include <linux/isdn/capilli.h>
+#include <linux/isdn/capicmd.h>
+#include <linux/isdn/capiutil.h>
+
+/* missing from kernelcapi.h */
+#define CapiNcpiNotSupportedByProtocol	0x0001
+#define CapiFlagsNotSupportedByProtocol	0x0002
+#define CapiAlertAlreadySent		0x0003
+#define CapiFacilitySpecificFunctionNotSupported	0x3011
+
+/* missing from capicmd.h */
+#define CAPI_CONNECT_IND_BASELEN	(CAPI_MSG_BASELEN+4+2+8*1)
+#define CAPI_CONNECT_ACTIVE_IND_BASELEN	(CAPI_MSG_BASELEN+4+3*1)
+#define CAPI_CONNECT_B3_IND_BASELEN	(CAPI_MSG_BASELEN+4+1)
+#define CAPI_CONNECT_B3_ACTIVE_IND_BASELEN	(CAPI_MSG_BASELEN+4+1)
+#define CAPI_DATA_B3_REQ_LEN64		(CAPI_MSG_BASELEN+4+4+2+2+2+8)
+#define CAPI_DATA_B3_CONF_LEN		(CAPI_MSG_BASELEN+4+2+2)
+#define CAPI_DISCONNECT_IND_LEN		(CAPI_MSG_BASELEN+4+2)
+#define CAPI_DISCONNECT_B3_IND_BASELEN	(CAPI_MSG_BASELEN+4+2+1)
+#define CAPI_FACILITY_CONF_BASELEN	(CAPI_MSG_BASELEN+4+2+2+1)
+/* most _CONF messages contain only Controller/PLCI/NCCI and Info parameters */
+#define CAPI_STDCONF_LEN		(CAPI_MSG_BASELEN+4+2)
+
+#define CAPI_FACILITY_HANDSET	0x0000
+#define CAPI_FACILITY_DTMF	0x0001
+#define CAPI_FACILITY_V42BIS	0x0002
+#define CAPI_FACILITY_SUPPSVC	0x0003
+#define CAPI_FACILITY_WAKEUP	0x0004
+#define CAPI_FACILITY_LI	0x0005
+
+#define CAPI_SUPPSVC_GETSUPPORTED	0x0000
+
+/* missing from capiutil.h */
+#define CAPIMSG_PLCI_PART(m)	CAPIMSG_U8(m, 9)
+#define CAPIMSG_NCCI_PART(m)	CAPIMSG_U16(m, 10)
+#define CAPIMSG_HANDLE_REQ(m)	CAPIMSG_U16(m, 18) /* DATA_B3_REQ/_IND only! */
+#define CAPIMSG_FLAGS(m)	CAPIMSG_U16(m, 20)
+#define CAPIMSG_SETCONTROLLER(m, contr)	capimsg_setu8(m, 8, contr)
+#define CAPIMSG_SETPLCI_PART(m, plci)	capimsg_setu8(m, 9, plci)
+#define CAPIMSG_SETNCCI_PART(m, ncci)	capimsg_setu16(m, 10, ncci)
+#define CAPIMSG_SETFLAGS(m, flags)	capimsg_setu16(m, 20, flags)
+
+/* parameters with differing location in DATA_B3_CONF/_RESP: */
+#define CAPIMSG_SETHANDLE_CONF(m, handle)	capimsg_setu16(m, 12, handle)
+#define	CAPIMSG_SETINFO_CONF(m, info)		capimsg_setu16(m, 14, info)
+
+/* Flags (DATA_B3_REQ/_IND) */
+#define CAPI_FLAGS_DELIVERY_CONFIRMATION	0x04
+#define CAPI_FLAGS_RESERVED			(~0x1f)
+
+/* buffer sizes */
+#define MAX_BC_OCTETS 11
+#define MAX_HLC_OCTETS 3
+#define MAX_NUMBER_DIGITS 20
+#define MAX_FMT_IE_LEN 20
+
+/* values for gigaset_capi_appl.connected */
+#define APCONN_NONE	0	/* inactive/listening */
+#define APCONN_SETUP	1	/* connecting */
+#define APCONN_ACTIVE	2	/* B channel up */
+
+/* registered application data structure */
+struct gigaset_capi_appl {
+	struct list_head ctrlist;
+	struct gigaset_capi_appl *bcnext;
+	u16 id;
+	u16 nextMessageNumber;
+	u32 listenInfoMask;
+	u32 listenCIPmask;
+	int connected;
+};
+
+/* CAPI specific controller data structure */
+struct gigaset_capi_ctr {
+	struct capi_ctr ctr;
+	struct list_head appls;
+	struct sk_buff_head sendqueue;
+	atomic_t sendqlen;
+	/* two _cmsg structures possibly used concurrently: */
+	_cmsg hcmsg;	/* for message composition triggered from hardware */
+	_cmsg acmsg;	/* for dissection of messages sent from application */
+	u8 bc_buf[MAX_BC_OCTETS+1];
+	u8 hlc_buf[MAX_HLC_OCTETS+1];
+	u8 cgpty_buf[MAX_NUMBER_DIGITS+3];
+	u8 cdpty_buf[MAX_NUMBER_DIGITS+2];
+};
+
+/* CIP Value table (from CAPI 2.0 standard, ch. 6.1) */
+static struct {
+	u8 *bc;
+	u8 *hlc;
+} cip2bchlc[] = {
+	[1] = { "8090A3", NULL },
+		/* Speech (A-law) */
+	[2] = { "8890", NULL },
+		/* Unrestricted digital information */
+	[3] = { "8990", NULL },
+		/* Restricted digital information */
+	[4] = { "9090A3", NULL },
+		/* 3,1 kHz audio (A-law) */
+	[5] = { "9190", NULL },
+		/* 7 kHz audio */
+	[6] = { "9890", NULL },
+		/* Video */
+	[7] = { "88C0C6E6", NULL },
+		/* Packet mode */
+	[8] = { "8890218F", NULL },
+		/* 56 kbit/s rate adaptation */
+	[9] = { "9190A5", NULL },
+		/* Unrestricted digital information with tones/announcements */
+	[16] = { "8090A3", "9181" },
+		/* Telephony */
+	[17] = { "9090A3", "9184" },
+		/* Group 2/3 facsimile */
+	[18] = { "8890", "91A1" },
+		/* Group 4 facsimile Class 1 */
+	[19] = { "8890", "91A4" },
+		/* Teletex service basic and mixed mode
+		   and Group 4 facsimile service Classes II and III */
+	[20] = { "8890", "91A8" },
+		/* Teletex service basic and processable mode */
+	[21] = { "8890", "91B1" },
+		/* Teletex service basic mode */
+	[22] = { "8890", "91B2" },
+		/* International interworking for Videotex */
+	[23] = { "8890", "91B5" },
+		/* Telex */
+	[24] = { "8890", "91B8" },
+		/* Message Handling Systems in accordance with X.400 */
+	[25] = { "8890", "91C1" },
+		/* OSI application in accordance with X.200 */
+	[26] = { "9190A5", "9181" },
+		/* 7 kHz telephony */
+	[27] = { "9190A5", "916001" },
+		/* Video telephony, first connection */
+	[28] = { "8890", "916002" },
+		/* Video telephony, second connection */
+};
+
+/*
+ * helper functions
+ * ================
+ */
+
+/*
+ * emit unsupported parameter warning
+ */
+static inline void ignore_cstruct_param(struct cardstate *cs, _cstruct param,
+				       char *msgname, char *paramname)
+{
+	if (param && *param)
+		dev_warn(cs->dev, "%s: ignoring unsupported parameter: %s\n",
+			 msgname, paramname);
+}
+
+static inline void ignore_cmstruct_param(struct cardstate *cs, _cmstruct param,
+				       char *msgname, char *paramname)
+{
+	if (param != CAPI_DEFAULT)
+		dev_warn(cs->dev, "%s: ignoring unsupported parameter: %s\n",
+			 msgname, paramname);
+}
+
+/*
+ * check for legal hex digit
+ */
+static inline int ishexdigit(char c)
+{
+	if (c >= '0' && c <= '9')
+		return 1;
+	if (c >= 'A' && c <= 'F')
+		return 1;
+	if (c >= 'a' && c <= 'f')
+		return 1;
+	return 0;
+}
+
+/*
+ * convert hex to binary
+ */
+static inline u8 hex2bin(char c)
+{
+	int result = c & 0x0f;
+	if (c & 0x40)
+		result += 9;
+	return result;
+}
+
+/*
+ * convert an IE from Gigaset hex string to ETSI binary representation
+ * including length byte
+ * return value: result length, -1 on error
+ */
+static int encode_ie(char *in, u8 *out, int maxlen)
+{
+	int l = 0;
+	while (*in) {
+		if (!ishexdigit(in[0]) || !ishexdigit(in[1]) || l >= maxlen)
+			return -1;
+		out[++l] = (hex2bin(in[0]) << 4) + hex2bin(in[1]);
+		in += 2;
+	}
+	out[0] = l;
+	return l;
+}
+
+/*
+ * convert an IE from ETSI binary representation including length byte
+ * to Gigaset hex string
+ */
+static void decode_ie(u8 *in, char *out)
+{
+	int i = *in;
+	while (i-- > 0) {
+		/* ToDo: conversion to upper case necessary? */
+		*out++ = toupper(hex_asc_hi(*++in));
+		*out++ = toupper(hex_asc_lo(*in));
+	}
+}
+
+/*
+ * retrieve application data structure for an application ID
+ */
+static inline struct gigaset_capi_appl *
+get_appl(struct gigaset_capi_ctr *iif, u16 appl)
+{
+	struct gigaset_capi_appl *ap;
+
+	list_for_each_entry(ap, &iif->appls, ctrlist)
+		if (ap->id == appl)
+			return ap;
+	return NULL;
+}
+
+/*
+ * dump CAPI message to kernel messages for debugging
+ */
+static inline void dump_cmsg(enum debuglevel level, const char *tag, _cmsg *p)
+{
+#ifdef CONFIG_GIGASET_DEBUG
+	_cdebbuf *cdb;
+
+	if (!(gigaset_debuglevel & level))
+		return;
+
+	cdb = capi_cmsg2str(p);
+	if (cdb) {
+		gig_dbg(level, "%s: [%d] %s", tag, p->ApplId, cdb->buf);
+		cdebbuf_free(cdb);
+	} else {
+		gig_dbg(level, "%s: [%d] %s", tag, p->ApplId,
+			capi_cmd2str(p->Command, p->Subcommand));
+	}
+#endif
+}
+
+static inline void dump_rawmsg(enum debuglevel level, const char *tag,
+			       unsigned char *data)
+{
+#ifdef CONFIG_GIGASET_DEBUG
+	char *dbgline;
+	int i, l;
+
+	if (!(gigaset_debuglevel & level))
+		return;
+
+	l = CAPIMSG_LEN(data);
+	if (l < 12) {
+		gig_dbg(level, "%s: ??? LEN=%04d", tag, l);
+		return;
+	}
+	gig_dbg(level, "%s: 0x%02x:0x%02x: ID=%03d #0x%04x LEN=%04d NCCI=0x%x",
+		tag, CAPIMSG_COMMAND(data), CAPIMSG_SUBCOMMAND(data),
+		CAPIMSG_APPID(data), CAPIMSG_MSGID(data), l,
+		CAPIMSG_CONTROL(data));
+	l -= 12;
+	dbgline = kmalloc(3*l, GFP_ATOMIC);
+	if (!dbgline)
+		return;
+	for (i = 0; i < l; i++) {
+		dbgline[3*i] = hex_asc_hi(data[12+i]);
+		dbgline[3*i+1] = hex_asc_lo(data[12+i]);
+		dbgline[3*i+2] = ' ';
+	}
+	dbgline[3*l-1] = '\0';
+	gig_dbg(level, "  %s", dbgline);
+	kfree(dbgline);
+	if (CAPIMSG_COMMAND(data) == CAPI_DATA_B3 &&
+	    (CAPIMSG_SUBCOMMAND(data) == CAPI_REQ ||
+	     CAPIMSG_SUBCOMMAND(data) == CAPI_IND) &&
+	    CAPIMSG_DATALEN(data) > 0) {
+		l = CAPIMSG_DATALEN(data);
+		dbgline = kmalloc(3*l, GFP_ATOMIC);
+		if (!dbgline)
+			return;
+		data += CAPIMSG_LEN(data);
+		for (i = 0; i < l; i++) {
+			dbgline[3*i] = hex_asc_hi(data[i]);
+			dbgline[3*i+1] = hex_asc_lo(data[i]);
+			dbgline[3*i+2] = ' ';
+		}
+		dbgline[3*l-1] = '\0';
+		gig_dbg(level, "  %s", dbgline);
+		kfree(dbgline);
+	}
+#endif
+}
+
+/*
+ * format CAPI IE as string
+ */
+
+static const char *format_ie(const char *ie)
+{
+	static char result[3*MAX_FMT_IE_LEN];
+	int len, count;
+	char *pout = result;
+
+	if (!ie)
+		return "NULL";
+
+	count = len = ie[0];
+	if (count > MAX_FMT_IE_LEN)
+		count = MAX_FMT_IE_LEN-1;
+	while (count--) {
+		*pout++ = hex_asc_hi(*++ie);
+		*pout++ = hex_asc_lo(*ie);
+		*pout++ = ' ';
+	}
+	if (len > MAX_FMT_IE_LEN) {
+		*pout++ = '.';
+		*pout++ = '.';
+		*pout++ = '.';
+	}
+	*--pout = 0;
+	return result;
+}
+
+
+/*
+ * driver interface functions
+ * ==========================
+ */
+
+/**
+ * gigaset_skb_sent() - acknowledge transmission of outgoing skb
+ * @bcs:	B channel descriptor structure.
+ * @skb:	sent data.
+ *
+ * Called by hardware module {bas,ser,usb}_gigaset when the data in a
+ * skb has been successfully sent, for signalling completion to the LL.
+ */
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *dskb)
+{
+	struct cardstate *cs = bcs->cs;
+	struct gigaset_capi_ctr *iif = cs->iif;
+	struct gigaset_capi_appl *ap = bcs->ap;
+	struct sk_buff *cskb;
+	u16 flags;
+
+	/* update statistics */
+	++bcs->trans_up;
+
+	if (!ap) {
+		dev_err(cs->dev, "%s: no application\n", __func__);
+		return;
+	}
+
+	/* don't send further B3 messages if disconnected */
+	if (ap->connected < APCONN_ACTIVE) {
+		gig_dbg(DEBUG_LLDATA, "disconnected, discarding ack");
+		return;
+	}
+
+	/* ToDo: honor unset "delivery confirmation" bit */
+	flags = CAPIMSG_FLAGS(dskb->head);
+
+	/* build DATA_B3_CONF message */
+	cskb = alloc_skb(CAPI_DATA_B3_CONF_LEN, GFP_ATOMIC);
+	if (!cskb) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		return;
+	}
+	/* frequent message, avoid _cmsg overhead */
+	CAPIMSG_SETLEN(cskb->data, CAPI_DATA_B3_CONF_LEN);
+	CAPIMSG_SETAPPID(cskb->data, ap->id);
+	CAPIMSG_SETCOMMAND(cskb->data, CAPI_DATA_B3);
+	CAPIMSG_SETSUBCOMMAND(cskb->data,  CAPI_CONF);
+	CAPIMSG_SETMSGID(cskb->data, CAPIMSG_MSGID(dskb->head));
+	CAPIMSG_SETCONTROLLER(cskb->data, iif->ctr.cnr);
+	CAPIMSG_SETPLCI_PART(cskb->data, bcs->channel + 1);
+	CAPIMSG_SETNCCI_PART(cskb->data, 1);
+	CAPIMSG_SETHANDLE_CONF(cskb->data, CAPIMSG_HANDLE_REQ(dskb->head));
+	if (flags & ~CAPI_FLAGS_DELIVERY_CONFIRMATION)
+		CAPIMSG_SETINFO_CONF(cskb->data,
+				     CapiFlagsNotSupportedByProtocol);
+	else
+		CAPIMSG_SETINFO_CONF(cskb->data, CAPI_NOERROR);
+
+	/* emit message */
+	dump_rawmsg(DEBUG_LLDATA, "DATA_B3_CONF", cskb->data);
+	capi_ctr_handle_message(&iif->ctr, ap->id, cskb);
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_sent);
+
+/**
+ * gigaset_skb_rcvd() - pass received skb to LL
+ * @bcs:	B channel descriptor structure.
+ * @skb:	received data.
+ *
+ * Called by hardware module {bas,ser,usb}_gigaset when user data has
+ * been successfully received, for passing to the LL.
+ * Warning: skb must not be accessed anymore!
+ */
+void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
+{
+	struct cardstate *cs = bcs->cs;
+	struct gigaset_capi_ctr *iif = cs->iif;
+	struct gigaset_capi_appl *ap = bcs->ap;
+	int len = skb->len;
+
+	/* update statistics */
+	bcs->trans_down++;
+
+	if (!ap) {
+		dev_err(cs->dev, "%s: no application\n", __func__);
+		return;
+	}
+
+	/* don't send further B3 messages if disconnected */
+	if (ap->connected < APCONN_ACTIVE) {
+		gig_dbg(DEBUG_LLDATA, "disconnected, discarding data");
+		dev_kfree_skb(skb);
+		return;
+	}
+
+	/*
+	 * prepend DATA_B3_IND message to payload
+	 * Parameters: NCCI = 1, all others 0/unused
+	 * frequent message, avoid _cmsg overhead
+	 */
+	skb_push(skb, CAPI_DATA_B3_REQ_LEN);
+	CAPIMSG_SETLEN(skb->data, CAPI_DATA_B3_REQ_LEN);
+	CAPIMSG_SETAPPID(skb->data, ap->id);
+	CAPIMSG_SETCOMMAND(skb->data, CAPI_DATA_B3);
+	CAPIMSG_SETSUBCOMMAND(skb->data,  CAPI_IND);
+	CAPIMSG_SETMSGID(skb->data, ap->nextMessageNumber++);
+	CAPIMSG_SETCONTROLLER(skb->data, iif->ctr.cnr);
+	CAPIMSG_SETPLCI_PART(skb->data, bcs->channel + 1);
+	CAPIMSG_SETNCCI_PART(skb->data, 1);
+	/* Data parameter not used */
+	CAPIMSG_SETDATALEN(skb->data, len);
+	/* Data handle parameter not used */
+	CAPIMSG_SETFLAGS(skb->data, 0);
+	/* Data64 parameter not present */
+
+	/* emit message */
+	dump_rawmsg(DEBUG_LLDATA, "DATA_B3_IND", skb->data);
+	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
+
+/**
+ * gigaset_isdn_rcv_err() - signal receive error
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by hardware module {bas,ser,usb}_gigaset when a receive error
+ * has occurred, for signalling to the LL.
+ */
+void gigaset_isdn_rcv_err(struct bc_state *bcs)
+{
+	/* if currently ignoring packets, just count down */
+	if (bcs->ignore) {
+		bcs->ignore--;
+		return;
+	}
+
+	/* update statistics */
+	bcs->corrupted++;
+
+	/* ToDo: signal error -> LL */
+}
+EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
+
+/**
+ * gigaset_isdn_icall() - signal incoming call
+ * @at_state:	connection state structure.
+ *
+ * Called by main module at tasklet level to notify the LL that an incoming
+ * call has been received. @at_state contains the parameters of the call.
+ *
+ * Return value: call disposition (ICALL_*)
+ */
+int gigaset_isdn_icall(struct at_state_t *at_state)
+{
+	struct cardstate *cs = at_state->cs;
+	struct bc_state *bcs = at_state->bcs;
+	struct gigaset_capi_ctr *iif = cs->iif;
+	struct gigaset_capi_appl *ap;
+	u32 actCIPmask;
+	struct sk_buff *skb;
+	unsigned int msgsize;
+	int i;
+
+	/*
+	 * ToDo: signal calls without a free B channel, too
+	 * (requires a u8 handle for the at_state structure that can
+	 * be stored in the PLCI and used in the CONNECT_RESP message
+	 * handler to retrieve it)
+	 */
+	if (!bcs)
+		return ICALL_IGNORE;
+
+	/* prepare CONNECT_IND message, using B channel number as PLCI */
+	capi_cmsg_header(&iif->hcmsg, 0, CAPI_CONNECT, CAPI_IND, 0,
+			 iif->ctr.cnr | ((bcs->channel + 1) << 8));
+
+	/* minimum size, all structs empty */
+	msgsize = CAPI_CONNECT_IND_BASELEN;
+
+	/* Bearer Capability (mandatory) */
+	if (at_state->str_var[STR_ZBC]) {
+		/* pass on BC from Gigaset */
+		if (encode_ie(at_state->str_var[STR_ZBC], iif->bc_buf,
+			      MAX_BC_OCTETS) < 0) {
+			dev_warn(cs->dev, "RING ignored - bad BC %s\n",
+				 at_state->str_var[STR_ZBC]);
+			return ICALL_IGNORE;
+		}
+
+		/* look up corresponding CIP value */
+		iif->hcmsg.CIPValue = 0;	/* default if nothing found */
+		for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
+			if (cip2bchlc[i].bc != NULL &&
+			    cip2bchlc[i].hlc == NULL &&
+			    !strcmp(cip2bchlc[i].bc,
+				    at_state->str_var[STR_ZBC])) {
+				iif->hcmsg.CIPValue = i;
+				break;
+			}
+	} else {
+		/* no BC (internal call): assume CIP 1 (speech, A-law) */
+		iif->hcmsg.CIPValue = 1;
+		encode_ie(cip2bchlc[1].bc, iif->bc_buf, MAX_BC_OCTETS);
+	}
+	iif->hcmsg.BC = iif->bc_buf;
+	msgsize += iif->hcmsg.BC[0];
+
+	/* High Layer Compatibility (optional) */
+	if (at_state->str_var[STR_ZHLC]) {
+		/* pass on HLC from Gigaset */
+		if (encode_ie(at_state->str_var[STR_ZHLC], iif->hlc_buf,
+			      MAX_HLC_OCTETS) < 0) {
+			dev_warn(cs->dev, "RING ignored - bad HLC %s\n",
+				 at_state->str_var[STR_ZHLC]);
+			return ICALL_IGNORE;
+		}
+		iif->hcmsg.HLC = iif->hlc_buf;
+		msgsize += iif->hcmsg.HLC[0];
+
+		/* look up corresponding CIP value */
+		/* keep BC based CIP value if none found */
+		if (at_state->str_var[STR_ZBC])
+			for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
+				if (cip2bchlc[i].hlc != NULL &&
+				    !strcmp(cip2bchlc[i].hlc,
+					    at_state->str_var[STR_ZHLC]) &&
+				    !strcmp(cip2bchlc[i].bc,
+					    at_state->str_var[STR_ZBC])) {
+					iif->hcmsg.CIPValue = i;
+					break;
+				}
+	}
+
+	/* Called Party Number (optional) */
+	if (at_state->str_var[STR_ZCPN]) {
+		i = strlen(at_state->str_var[STR_ZCPN]);
+		if (i > MAX_NUMBER_DIGITS) {
+			dev_warn(cs->dev, "RING ignored - bad number %s\n",
+				 at_state->str_var[STR_ZBC]);
+			return ICALL_IGNORE;
+		}
+		iif->cdpty_buf[0] = i + 1;
+		iif->cdpty_buf[1] = 0x80; /* type / numbering plan unknown */
+		memcpy(iif->cdpty_buf+2, at_state->str_var[STR_ZCPN], i);
+		iif->hcmsg.CalledPartyNumber = iif->cdpty_buf;
+		msgsize += iif->hcmsg.CalledPartyNumber[0];
+	}
+
+	/* Calling Party Number (optional) */
+	if (at_state->str_var[STR_NMBR]) {
+		i = strlen(at_state->str_var[STR_NMBR]);
+		if (i > MAX_NUMBER_DIGITS) {
+			dev_warn(cs->dev, "RING ignored - bad number %s\n",
+				 at_state->str_var[STR_ZBC]);
+			return ICALL_IGNORE;
+		}
+		iif->cgpty_buf[0] = i + 2;
+		iif->cgpty_buf[1] = 0x00; /* type / numbering plan unknown */
+		iif->cgpty_buf[2] = 0x80; /* pres. allowed, not screened */
+		memcpy(iif->cgpty_buf+3, at_state->str_var[STR_NMBR], i);
+		iif->hcmsg.CallingPartyNumber = iif->cgpty_buf;
+		msgsize += iif->hcmsg.CallingPartyNumber[0];
+	}
+
+	/* remaining parameters (not supported, always left NULL):
+	 * - CalledPartySubaddress
+	 * - CallingPartySubaddress
+	 * - AdditionalInfo
+	 *   - BChannelinformation
+	 *   - Keypadfacility
+	 *   - Useruserdata
+	 *   - Facilitydataarray
+	 */
+
+	gig_dbg(DEBUG_CMD, "icall: PLCI %x CIP %d BC %s",
+		iif->hcmsg.adr.adrPLCI, iif->hcmsg.CIPValue,
+		format_ie(iif->hcmsg.BC));
+	gig_dbg(DEBUG_CMD, "icall: HLC %s",
+		format_ie(iif->hcmsg.HLC));
+	gig_dbg(DEBUG_CMD, "icall: CgPty %s",
+		format_ie(iif->hcmsg.CallingPartyNumber));
+	gig_dbg(DEBUG_CMD, "icall: CdPty %s",
+		format_ie(iif->hcmsg.CalledPartyNumber));
+
+	/* scan application list for matching listeners */
+	bcs->ap = NULL;
+	actCIPmask = 1 | (1 << iif->hcmsg.CIPValue);
+	list_for_each_entry(ap, &iif->appls, ctrlist)
+		if (actCIPmask & ap->listenCIPmask) {
+			/* build CONNECT_IND message for this application */
+			iif->hcmsg.ApplId = ap->id;
+			iif->hcmsg.Messagenumber = ap->nextMessageNumber++;
+
+			skb = alloc_skb(msgsize, GFP_ATOMIC);
+			if (!skb) {
+				dev_err(cs->dev, "%s: out of memory\n",
+					__func__);
+				break;
+			}
+			capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
+			dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
+
+			/* add to listeners on this B channel, update state */
+			ap->bcnext = bcs->ap;
+			bcs->ap = ap;
+			bcs->chstate |= CHS_NOTIFY_LL;
+			ap->connected = APCONN_SETUP;
+
+			/* emit message */
+			capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+		}
+
+	/*
+	 * Return "accept" if any listeners.
+	 * Gigaset will send ALERTING.
+	 * There doesn't seem to be a way to avoid this.
+	 */
+	return bcs->ap ? ICALL_ACCEPT : ICALL_IGNORE;
+}
+
+/*
+ * send a DISCONNECT_IND message to an application
+ * does not sleep, clobbers the controller's hcmsg structure
+ */
+static void send_disconnect_ind(struct bc_state *bcs,
+				struct gigaset_capi_appl *ap, u16 reason)
+{
+	struct cardstate *cs = bcs->cs;
+	struct gigaset_capi_ctr *iif = cs->iif;
+	struct sk_buff *skb;
+
+	if (ap->connected == APCONN_NONE)
+		return;
+
+	capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT, CAPI_IND,
+			 ap->nextMessageNumber++,
+			 iif->ctr.cnr | ((bcs->channel + 1) << 8));
+	iif->hcmsg.Reason = reason;
+	skb = alloc_skb(CAPI_DISCONNECT_IND_LEN, GFP_ATOMIC);
+	if (!skb) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		return;
+	}
+	capi_cmsg2message(&iif->hcmsg, __skb_put(skb, CAPI_DISCONNECT_IND_LEN));
+	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
+	ap->connected = APCONN_NONE;
+	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+}
+
+/*
+ * send a DISCONNECT_B3_IND message to an application
+ * Parameters: NCCI = 1, NCPI empty, Reason_B3 = 0
+ * does not sleep, clobbers the controller's hcmsg structure
+ */
+static void send_disconnect_b3_ind(struct bc_state *bcs,
+				   struct gigaset_capi_appl *ap)
+{
+	struct cardstate *cs = bcs->cs;
+	struct gigaset_capi_ctr *iif = cs->iif;
+	struct sk_buff *skb;
+
+	/* nothing to do if no logical connection active */
+	if (ap->connected < APCONN_ACTIVE)
+		return;
+	ap->connected = APCONN_SETUP;
+
+	capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
+			 ap->nextMessageNumber++,
+			 iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
+	skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_ATOMIC);
+	if (!skb) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		return;
+	}
+	capi_cmsg2message(&iif->hcmsg,
+			  __skb_put(skb, CAPI_DISCONNECT_B3_IND_BASELEN));
+	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
+	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+}
+
+/**
+ * gigaset_isdn_connD() - signal D channel connect
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module at tasklet level to notify the LL that the D channel
+ * connection has been established.
+ */
+void gigaset_isdn_connD(struct bc_state *bcs)
+{
+	struct cardstate *cs = bcs->cs;
+	struct gigaset_capi_ctr *iif = cs->iif;
+	struct gigaset_capi_appl *ap = bcs->ap;
+	struct sk_buff *skb;
+	unsigned int msgsize;
+
+	if (!ap) {
+		dev_err(cs->dev, "%s: no application\n", __func__);
+		return;
+	}
+	while (ap->bcnext) {
+		/* this should never happen */
+		dev_warn(cs->dev, "%s: dropping extra application %u\n",
+			 __func__, ap->bcnext->id);
+		send_disconnect_ind(bcs, ap->bcnext,
+				    CapiCallGivenToOtherApplication);
+		ap->bcnext = ap->bcnext->bcnext;
+	}
+	if (ap->connected == APCONN_NONE) {
+		dev_warn(cs->dev, "%s: application %u not connected\n",
+			 __func__, ap->id);
+		return;
+	}
+
+	/* prepare CONNECT_ACTIVE_IND message
+	 * Note: LLC not supported by device
+	 */
+	capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_CONNECT_ACTIVE, CAPI_IND,
+			 ap->nextMessageNumber++,
+			 iif->ctr.cnr | ((bcs->channel + 1) << 8));
+
+	/* minimum size, all structs empty */
+	msgsize = CAPI_CONNECT_ACTIVE_IND_BASELEN;
+
+	/* ToDo: set parameter: Connected number
+	 * (requires ev-layer state machine extension to collect
+	 * ZCON device reply)
+	 */
+
+	/* build and emit CONNECT_ACTIVE_IND message */
+	skb = alloc_skb(msgsize, GFP_ATOMIC);
+	if (!skb) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		return;
+	}
+	capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
+	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
+	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+}
+
+/**
+ * gigaset_isdn_hupD() - signal D channel hangup
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module at tasklet level to notify the LL that the D channel
+ * connection has been shut down.
+ */
+void gigaset_isdn_hupD(struct bc_state *bcs)
+{
+	struct gigaset_capi_appl *ap;
+
+	/*
+	 * ToDo: pass on reason code reported by device
+	 * (requires ev-layer state machine extension to collect
+	 * ZCAU device reply)
+	 */
+	for (ap = bcs->ap; ap != NULL; ap = ap->bcnext) {
+		send_disconnect_b3_ind(bcs, ap);
+		send_disconnect_ind(bcs, ap, 0);
+	}
+	bcs->ap = NULL;
+}
+
+/**
+ * gigaset_isdn_connB() - signal B channel connect
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module at tasklet level to notify the LL that the B channel
+ * connection has been established.
+ */
+void gigaset_isdn_connB(struct bc_state *bcs)
+{
+	struct cardstate *cs = bcs->cs;
+	struct gigaset_capi_ctr *iif = cs->iif;
+	struct gigaset_capi_appl *ap = bcs->ap;
+	struct sk_buff *skb;
+	unsigned int msgsize;
+	u8 command;
+
+	if (!ap) {
+		dev_err(cs->dev, "%s: no application\n", __func__);
+		return;
+	}
+	while (ap->bcnext) {
+		/* this should never happen */
+		dev_warn(cs->dev, "%s: dropping extra application %u\n",
+			 __func__, ap->bcnext->id);
+		send_disconnect_ind(bcs, ap->bcnext,
+				    CapiCallGivenToOtherApplication);
+		ap->bcnext = ap->bcnext->bcnext;
+	}
+	if (!ap->connected) {
+		dev_warn(cs->dev, "%s: application %u not connected\n",
+			 __func__, ap->id);
+		return;
+	}
+
+	/*
+	 * emit CONNECT_B3_ACTIVE_IND if we already got CONNECT_B3_REQ;
+	 * otherwise we have to emit CONNECT_B3_IND first, and follow up with
+	 * CONNECT_B3_ACTIVE_IND in reply to CONNECT_B3_RESP
+	 * Parameters in both cases always: NCCI = 1, NCPI empty
+	 */
+	if (ap->connected >= APCONN_ACTIVE) {
+		command = CAPI_CONNECT_B3_ACTIVE;
+		msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
+	} else {
+		command = CAPI_CONNECT_B3;
+		msgsize = CAPI_CONNECT_B3_IND_BASELEN;
+	}
+	capi_cmsg_header(&iif->hcmsg, ap->id, command, CAPI_IND,
+			 ap->nextMessageNumber++,
+			 iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
+	skb = alloc_skb(msgsize, GFP_ATOMIC);
+	if (!skb) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		return;
+	}
+	capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
+	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
+	ap->connected = APCONN_ACTIVE;
+	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+}
+
+/**
+ * gigaset_isdn_hupB() - signal B channel hangup
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module to notify the LL that the B channel connection has
+ * been shut down.
+ */
+void gigaset_isdn_hupB(struct bc_state *bcs)
+{
+	struct cardstate *cs = bcs->cs;
+	struct gigaset_capi_appl *ap = bcs->ap;
+
+	/* ToDo: assure order of DISCONNECT_B3_IND and DISCONNECT_IND ? */
+
+	if (!ap) {
+		dev_err(cs->dev, "%s: no application\n", __func__);
+		return;
+	}
+
+	send_disconnect_b3_ind(bcs, ap);
+}
+
+/**
+ * gigaset_isdn_start() - signal device availability
+ * @cs:		device descriptor structure.
+ *
+ * Called by main module to notify the LL that the device is available for
+ * use.
+ */
+void gigaset_isdn_start(struct cardstate *cs)
+{
+	struct gigaset_capi_ctr *iif = cs->iif;
+
+	/* fill profile data: manufacturer name */
+	strcpy(iif->ctr.manu, "Siemens");
+	/* CAPI and device version */
+	iif->ctr.version.majorversion = 2;		/* CAPI 2.0 */
+	iif->ctr.version.minorversion = 0;
+	/* ToDo: check/assert cs->gotfwver? */
+	iif->ctr.version.majormanuversion = cs->fwver[0];
+	iif->ctr.version.minormanuversion = cs->fwver[1];
+	/* number of B channels supported */
+	iif->ctr.profile.nbchannel = cs->channels;
+	/* global options: internal controller, supplementary services */
+	iif->ctr.profile.goptions = 0x11;
+	/* B1 protocols: 64 kbit/s HDLC or transparent */
+	iif->ctr.profile.support1 =  0x03;
+	/* B2 protocols: transparent only */
+	/* ToDo: X.75 SLP ? */
+	iif->ctr.profile.support2 =  0x02;
+	/* B3 protocols: transparent only */
+	iif->ctr.profile.support3 =  0x01;
+	/* no serial number */
+	strcpy(iif->ctr.serial, "0");
+	capi_ctr_ready(&iif->ctr);
+}
+
+/**
+ * gigaset_isdn_stop() - signal device unavailability
+ * @cs:		device descriptor structure.
+ *
+ * Called by main module to notify the LL that the device is no longer
+ * available for use.
+ */
+void gigaset_isdn_stop(struct cardstate *cs)
+{
+	struct gigaset_capi_ctr *iif = cs->iif;
+	capi_ctr_down(&iif->ctr);
+}
+
+/*
+ * kernel CAPI callback methods
+ * ============================
+ */
+
+/*
+ * load firmware
+ */
+static int gigaset_load_firmware(struct capi_ctr *ctr, capiloaddata *data)
+{
+	struct cardstate *cs = ctr->driverdata;
+
+	/* AVM specific operation, not needed for Gigaset -- ignore */
+	dev_notice(cs->dev, "load_firmware ignored\n");
+
+	return 0;
+}
+
+/*
+ * reset (deactivate) controller
+ */
+static void gigaset_reset_ctr(struct capi_ctr *ctr)
+{
+	struct cardstate *cs = ctr->driverdata;
+
+	/* AVM specific operation, not needed for Gigaset -- ignore */
+	dev_notice(cs->dev, "reset_ctr ignored\n");
+}
+
+/*
+ * register CAPI application
+ */
+static void gigaset_register_appl(struct capi_ctr *ctr, u16 appl,
+			   capi_register_params *rp)
+{
+	struct gigaset_capi_ctr *iif
+		= container_of(ctr, struct gigaset_capi_ctr, ctr);
+	struct cardstate *cs = ctr->driverdata;
+	struct gigaset_capi_appl *ap;
+
+	list_for_each_entry(ap, &iif->appls, ctrlist)
+		if (ap->id == appl) {
+			dev_notice(cs->dev,
+				   "application %u already registered\n", appl);
+			return;
+		}
+
+	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
+	if (!ap) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		return;
+	}
+	ap->id = appl;
+
+	list_add(&ap->ctrlist, &iif->appls);
+}
+
+/*
+ * release CAPI application
+ */
+static void gigaset_release_appl(struct capi_ctr *ctr, u16 appl)
+{
+	struct gigaset_capi_ctr *iif
+		= container_of(ctr, struct gigaset_capi_ctr, ctr);
+	struct cardstate *cs = iif->ctr.driverdata;
+	struct gigaset_capi_appl *ap, *tmp;
+
+	list_for_each_entry_safe(ap, tmp, &iif->appls, ctrlist)
+		if (ap->id == appl) {
+			if (ap->connected != APCONN_NONE) {
+				dev_err(cs->dev,
+					"%s: application %u still connected\n",
+					__func__, ap->id);
+				/* ToDo: clear active connection */
+			}
+			list_del(&ap->ctrlist);
+			kfree(ap);
+		}
+
+}
+
+/*
+ * =====================================================================
+ * outgoing CAPI message handler
+ * =====================================================================
+ */
+
+/*
+ * helper function: emit reply message with given Info value
+ */
+static void send_conf(struct gigaset_capi_ctr *iif,
+		      struct gigaset_capi_appl *ap,
+		      struct sk_buff *skb,
+		      u16 info)
+{
+	/*
+	 * _CONF replies always only have NCCI and Info parameters
+	 * so they'll fit into the _REQ message skb
+	 */
+	capi_cmsg_answer(&iif->acmsg);
+	iif->acmsg.Info = info;
+	capi_cmsg2message(&iif->acmsg, skb->data);
+	__skb_trim(skb, CAPI_STDCONF_LEN);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+}
+
+/*
+ * process FACILITY_REQ message
+ */
+static void do_facility_req(struct gigaset_capi_ctr *iif,
+			    struct gigaset_capi_appl *ap,
+			    struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	struct sk_buff *cskb;
+	u8 *pparam;
+	unsigned int msgsize = CAPI_FACILITY_CONF_BASELEN;
+	u16 function, info;
+	static u8 confparam[10];	/* max. 9 octets + length byte */
+
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+
+	/*
+	 * Facility Request Parameter is not decoded by capi_message2cmsg()
+	 * encoding depends on Facility Selector
+	 */
+	switch (iif->acmsg.FacilitySelector) {
+	case CAPI_FACILITY_DTMF:	/* ToDo */
+		info = CapiFacilityNotSupported;
+		confparam[0] = 2;	/* length */
+		/* DTMF information: Unknown DTMF request */
+		capimsg_setu16(confparam, 1, 2);
+		break;
+
+	case CAPI_FACILITY_V42BIS:	/* not supported */
+		info = CapiFacilityNotSupported;
+		confparam[0] = 2;	/* length */
+		/* V.42 bis information: not available */
+		capimsg_setu16(confparam, 1, 1);
+		break;
+
+	case CAPI_FACILITY_SUPPSVC:
+		/* decode Function parameter */
+		pparam = iif->acmsg.FacilityRequestParameter;
+		if (pparam == NULL || *pparam < 2) {
+			dev_notice(cs->dev, "%s: %s missing\n", "FACILITY_REQ",
+				   "Facility Request Parameter");
+			send_conf(iif, ap, skb, CapiIllMessageParmCoding);
+			return;
+		}
+		function = CAPIMSG_U16(pparam, 1);
+		switch (function) {
+		case CAPI_SUPPSVC_GETSUPPORTED:
+			info = CapiSuccess;
+			/* Supplementary Service specific parameter */
+			confparam[3] = 6;	/* length */
+			/* Supplementary services info: Success */
+			capimsg_setu16(confparam, 4, CapiSuccess);
+			/* Supported Services: none */
+			capimsg_setu32(confparam, 6, 0);
+			break;
+		/* ToDo: add supported services */
+		default:
+			info = CapiFacilitySpecificFunctionNotSupported;
+			/* Supplementary Service specific parameter */
+			confparam[3] = 2;	/* length */
+			/* Supplementary services info: not supported */
+			capimsg_setu16(confparam, 4,
+				       CapiSupplementaryServiceNotSupported);
+		}
+
+		/* Facility confirmation parameter */
+		confparam[0] = confparam[3] + 3;	/* total length */
+		/* Function: copy from _REQ message */
+		capimsg_setu16(confparam, 1, function);
+		/* Supplementary Service specific parameter already set above */
+		break;
+
+	case CAPI_FACILITY_WAKEUP:	/* ToDo */
+		info = CapiFacilityNotSupported;
+		confparam[0] = 2;	/* length */
+		/* Number of accepted awake request parameters: 0 */
+		capimsg_setu16(confparam, 1, 0);
+		break;
+
+	default:
+		info = CapiFacilityNotSupported;
+		confparam[0] = 0;	/* empty struct */
+	}
+
+	/* send FACILITY_CONF with given Info and confirmation parameter */
+	capi_cmsg_answer(&iif->acmsg);
+	iif->acmsg.Info = info;
+	iif->acmsg.FacilityConfirmationParameter = confparam;
+	msgsize += confparam[0];	/* length */
+	cskb = alloc_skb(msgsize, GFP_ATOMIC);
+	if (!cskb) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		return;
+	}
+	capi_cmsg2message(&iif->acmsg, __skb_put(cskb, msgsize));
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+		capi_ctr_handle_message(&iif->ctr, ap->id, cskb);
+}
+
+
+/*
+ * process LISTEN_REQ message
+ * just store the masks in the application data structure
+ */
+static void do_listen_req(struct gigaset_capi_ctr *iif,
+			  struct gigaset_capi_appl *ap,
+			  struct sk_buff *skb)
+{
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+
+	/* store listening parameters */
+	ap->listenInfoMask = iif->acmsg.InfoMask;
+	ap->listenCIPmask = iif->acmsg.CIPmask;
+	send_conf(iif, ap, skb, CapiSuccess);
+}
+
+/*
+ * process ALERT_REQ message
+ * nothing to do, Gigaset always alerts anyway
+ */
+static void do_alert_req(struct gigaset_capi_ctr *iif,
+			 struct gigaset_capi_appl *ap,
+			 struct sk_buff *skb)
+{
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+	send_conf(iif, ap, skb, CapiAlertAlreadySent);
+}
+
+/*
+ * process CONNECT_REQ message
+ * allocate a B channel, prepare dial commands, queue a DIAL event,
+ * emit CONNECT_CONF reply
+ */
+static void do_connect_req(struct gigaset_capi_ctr *iif,
+			   struct gigaset_capi_appl *ap,
+			   struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	_cmsg *cmsg = &iif->acmsg;
+	struct bc_state *bcs;
+	char **commands;
+	char *s;
+	u8 *pp;
+	int i, l;
+	u16 info;
+
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+
+	/* get free B channel & construct PLCI */
+	bcs = gigaset_get_free_channel(cs);
+	if (!bcs) {
+		dev_notice(cs->dev, "%s: no B channel available\n",
+			   "CONNECT_REQ");
+		send_conf(iif, ap, skb, CapiNoPlciAvailable);
+		return;
+	}
+	ap->bcnext = NULL;
+	bcs->ap = ap;
+	cmsg->adr.adrPLCI |= (bcs->channel + 1) << 8;
+
+	/* build command table */
+	commands = kzalloc(AT_NUM*(sizeof *commands), GFP_KERNEL);
+	if (!commands)
+		goto oom;
+
+	/* encode parameter: Called party number */
+	pp = cmsg->CalledPartyNumber;
+	if (pp == NULL || *pp == 0) {
+		dev_notice(cs->dev, "%s: %s missing\n",
+			   "CONNECT_REQ", "Called party number");
+		info = CapiIllMessageParmCoding;
+		goto error;
+	}
+	l = *pp++;
+	/* check type of number/numbering plan byte */
+	switch (*pp) {
+	case 0x80:	/* unknown type / unknown numbering plan */
+	case 0x81:	/* unknown type / ISDN/Telephony numbering plan */
+		break;
+	default:	/* others: warn about potential misinterpretation */
+		dev_notice(cs->dev, "%s: %s type/plan 0x%02x unsupported\n",
+			   "CONNECT_REQ", "Called party number", *pp);
+	}
+	pp++;
+	l--;
+	/* translate "**" internal call prefix to CTP value */
+	if (l >= 2 && pp[0] == '*' && pp[1] == '*') {
+		s = "^SCTP=0\r";
+		pp += 2;
+		l -= 2;
+	} else {
+		s = "^SCTP=1\r";
+	}
+	commands[AT_TYPE] = kstrdup(s, GFP_KERNEL);
+	if (!commands[AT_TYPE])
+		goto oom;
+	commands[AT_DIAL] = kmalloc(l+3, GFP_KERNEL);
+	if (!commands[AT_DIAL])
+		goto oom;
+	snprintf(commands[AT_DIAL], l+3, "D%*s\r", l, pp);
+
+	/* encode parameter: Calling party number */
+	pp = cmsg->CallingPartyNumber;
+	if (pp != NULL && *pp > 0) {
+		l = *pp++;
+
+		/* check type of number/numbering plan byte */
+		/* ToDo: allow for/handle Ext=1? */
+		switch (*pp) {
+		case 0x00:	/* unknown type / unknown numbering plan */
+		case 0x01:	/* unknown type / ISDN/Telephony num. plan */
+			break;
+		default:
+			dev_notice(cs->dev,
+				   "%s: %s type/plan 0x%02x unsupported\n",
+				   "CONNECT_REQ", "Calling party number", *pp);
+		}
+		pp++;
+		l--;
+
+		/* check presentation indicator */
+		if (!l) {
+			dev_notice(cs->dev, "%s: %s IE truncated\n",
+				   "CONNECT_REQ", "Calling party number");
+			info = CapiIllMessageParmCoding;
+			goto error;
+		}
+		switch (*pp & 0xfc) { /* ignore Screening indicator */
+		case 0x80:	/* Presentation allowed */
+			s = "^SCLIP=1\r";
+			break;
+		case 0xa0:	/* Presentation restricted */
+			s = "^SCLIP=0\r";
+			break;
+		default:
+			dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
+				   "CONNECT_REQ",
+				   "Presentation/Screening indicator",
+				   *pp);
+			s = "^SCLIP=1\r";
+		}
+		commands[AT_CLIP] = kstrdup(s, GFP_KERNEL);
+		if (!commands[AT_CLIP])
+			goto oom;
+		pp++;
+		l--;
+
+		if (l) {
+			/* number */
+			commands[AT_MSN] = kmalloc(l+8, GFP_KERNEL);
+			if (!commands[AT_MSN])
+				goto oom;
+			snprintf(commands[AT_MSN], l+8, "^SMSN=%*s\r", l, pp);
+		}
+	}
+
+	/* check parameter: CIP Value */
+	if (cmsg->CIPValue > ARRAY_SIZE(cip2bchlc) ||
+	    (cmsg->CIPValue > 0 && cip2bchlc[cmsg->CIPValue].bc == NULL)) {
+		dev_notice(cs->dev, "%s: unknown CIP value %d\n",
+			   "CONNECT_REQ", cmsg->CIPValue);
+		info = CapiCipValueUnknown;
+		goto error;
+	}
+
+	/* check/encode parameter: BC */
+	if (cmsg->BC && cmsg->BC[0]) {
+		/* explicit BC overrides CIP */
+		l = 2*cmsg->BC[0] + 7;
+		commands[AT_BC] = kmalloc(l, GFP_KERNEL);
+		if (!commands[AT_BC])
+			goto oom;
+		strcpy(commands[AT_BC], "^SBC=");
+		decode_ie(cmsg->BC, commands[AT_BC]+5);
+		strcpy(commands[AT_BC] + l - 2, "\r");
+	} else if (cip2bchlc[cmsg->CIPValue].bc) {
+		l = strlen(cip2bchlc[cmsg->CIPValue].bc) + 7;
+		commands[AT_BC] = kmalloc(l, GFP_KERNEL);
+		if (!commands[AT_BC])
+			goto oom;
+		snprintf(commands[AT_BC], l, "^SBC=%s\r",
+			 cip2bchlc[cmsg->CIPValue].bc);
+	}
+
+	/* check/encode parameter: HLC */
+	if (cmsg->HLC && cmsg->HLC[0]) {
+		/* explicit HLC overrides CIP */
+		l = 2*cmsg->HLC[0] + 7;
+		commands[AT_HLC] = kmalloc(l, GFP_KERNEL);
+		if (!commands[AT_HLC])
+			goto oom;
+		strcpy(commands[AT_HLC], "^SHLC=");
+		decode_ie(cmsg->HLC, commands[AT_HLC]+5);
+		strcpy(commands[AT_HLC] + l - 2, "\r");
+	} else if (cip2bchlc[cmsg->CIPValue].hlc) {
+		l = strlen(cip2bchlc[cmsg->CIPValue].hlc) + 7;
+		commands[AT_HLC] = kmalloc(l, GFP_KERNEL);
+		if (!commands[AT_HLC])
+			goto oom;
+		snprintf(commands[AT_HLC], l, "^SHLC=%s\r",
+			 cip2bchlc[cmsg->CIPValue].hlc);
+	}
+
+	/* check/encode parameter: B Protocol */
+	if (cmsg->BProtocol == CAPI_DEFAULT) {
+		bcs->proto2 = L2_HDLC;
+		dev_warn(cs->dev,
+		    "B2 Protocol X.75 SLP unsupported, using Transparent\n");
+	} else {
+		switch (cmsg->B1protocol) {
+		case 0:
+			bcs->proto2 = L2_HDLC;
+			break;
+		case 1:
+			bcs->proto2 = L2_BITSYNC;
+			break;
+		default:
+			dev_warn(cs->dev,
+			    "B1 Protocol %u unsupported, using Transparent\n",
+				 cmsg->B1protocol);
+			bcs->proto2 = L2_BITSYNC;
+		}
+		if (cmsg->B2protocol != 1)
+			dev_warn(cs->dev,
+			    "B2 Protocol %u unsupported, using Transparent\n",
+				 cmsg->B2protocol);
+		if (cmsg->B3protocol != 0)
+			dev_warn(cs->dev,
+			    "B3 Protocol %u unsupported, using Transparent\n",
+				 cmsg->B3protocol);
+		ignore_cstruct_param(cs, cmsg->B1configuration,
+					"CONNECT_REQ", "B1 Configuration");
+		ignore_cstruct_param(cs, cmsg->B2configuration,
+					"CONNECT_REQ", "B2 Configuration");
+		ignore_cstruct_param(cs, cmsg->B3configuration,
+					"CONNECT_REQ", "B3 Configuration");
+	}
+	commands[AT_PROTO] = kmalloc(9, GFP_KERNEL);
+	if (!commands[AT_PROTO])
+		goto oom;
+	snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
+
+	/* ToDo: check/encode remaining parameters */
+	ignore_cstruct_param(cs, cmsg->CalledPartySubaddress,
+					"CONNECT_REQ", "Called pty subaddr");
+	ignore_cstruct_param(cs, cmsg->CallingPartySubaddress,
+					"CONNECT_REQ", "Calling pty subaddr");
+	ignore_cstruct_param(cs, cmsg->LLC,
+					"CONNECT_REQ", "LLC");
+	ignore_cmstruct_param(cs, cmsg->AdditionalInfo,
+					"CONNECT_REQ", "Additional Info");
+
+	/* encode parameter: B channel to use */
+	commands[AT_ISO] = kmalloc(9, GFP_KERNEL);
+	if (!commands[AT_ISO])
+		goto oom;
+	snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
+		 (unsigned) bcs->channel + 1);
+
+	/* queue & schedule EV_DIAL event */
+	if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
+			       bcs->at_state.seq_index, NULL))
+		goto oom;
+	gig_dbg(DEBUG_CMD, "scheduling DIAL");
+	gigaset_schedule_event(cs);
+	ap->connected = APCONN_SETUP;
+	send_conf(iif, ap, skb, CapiSuccess);
+	return;
+
+oom:
+	dev_err(cs->dev, "%s: out of memory\n", __func__);
+	info = CAPI_MSGOSRESOURCEERR;
+error:
+	if (commands)
+		for (i = 0; i < AT_NUM; i++)
+			kfree(commands[i]);
+	kfree(commands);
+	gigaset_free_channel(bcs);
+	send_conf(iif, ap, skb, info);
+}
+
+/*
+ * process CONNECT_RESP message
+ * checks protocol parameters and queues an ACCEPT or HUP event
+ */
+static void do_connect_resp(struct gigaset_capi_ctr *iif,
+			    struct gigaset_capi_appl *ap,
+			    struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	_cmsg *cmsg = &iif->acmsg;
+	struct bc_state *bcs;
+	struct gigaset_capi_appl *oap;
+	int channel;
+
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+	dev_kfree_skb(skb);
+
+	/* extract and check channel number from PLCI */
+	channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
+	if (!channel || channel > cs->channels) {
+		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
+			   "CONNECT_RESP", "PLCI", cmsg->adr.adrPLCI);
+		return;
+	}
+	bcs = cs->bcs + channel - 1;
+
+	switch (cmsg->Reject) {
+	case 0:		/* Accept */
+		/* drop all competing applications, keep only this one */
+		for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
+			if (oap != ap)
+				send_disconnect_ind(bcs, oap,
+					CapiCallGivenToOtherApplication);
+		ap->bcnext = NULL;
+		bcs->ap = ap;
+		bcs->chstate |= CHS_NOTIFY_LL;
+
+		/* check/encode B channel protocol */
+		if (cmsg->BProtocol == CAPI_DEFAULT) {
+			bcs->proto2 = L2_HDLC;
+			dev_warn(cs->dev,
+		"B2 Protocol X.75 SLP unsupported, using Transparent\n");
+		} else {
+			switch (cmsg->B1protocol) {
+			case 0:
+				bcs->proto2 = L2_HDLC;
+				break;
+			case 1:
+				bcs->proto2 = L2_BITSYNC;
+				break;
+			default:
+				dev_warn(cs->dev,
+			"B1 Protocol %u unsupported, using Transparent\n",
+					 cmsg->B1protocol);
+				bcs->proto2 = L2_BITSYNC;
+			}
+			if (cmsg->B2protocol != 1)
+				dev_warn(cs->dev,
+			"B2 Protocol %u unsupported, using Transparent\n",
+					 cmsg->B2protocol);
+			if (cmsg->B3protocol != 0)
+				dev_warn(cs->dev,
+			"B3 Protocol %u unsupported, using Transparent\n",
+					 cmsg->B3protocol);
+			ignore_cstruct_param(cs, cmsg->B1configuration,
+					"CONNECT_RESP", "B1 Configuration");
+			ignore_cstruct_param(cs, cmsg->B2configuration,
+					"CONNECT_RESP", "B2 Configuration");
+			ignore_cstruct_param(cs, cmsg->B3configuration,
+					"CONNECT_RESP", "B3 Configuration");
+		}
+
+		/* ToDo: check/encode remaining parameters */
+		ignore_cstruct_param(cs, cmsg->ConnectedNumber,
+					"CONNECT_RESP", "Connected Number");
+		ignore_cstruct_param(cs, cmsg->ConnectedSubaddress,
+					"CONNECT_RESP", "Connected Subaddress");
+		ignore_cstruct_param(cs, cmsg->LLC,
+					"CONNECT_RESP", "LLC");
+		ignore_cmstruct_param(cs, cmsg->AdditionalInfo,
+					"CONNECT_RESP", "Additional Info");
+
+		/* Accept call */
+		if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
+				       EV_ACCEPT, NULL, 0, NULL))
+			return;
+		gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
+		gigaset_schedule_event(cs);
+		return;
+
+	case 1:			/* Ignore */
+		/* send DISCONNECT_IND to this application */
+		send_disconnect_ind(bcs, ap, 0);
+
+		/* remove it from the list of listening apps */
+		if (bcs->ap == ap) {
+			bcs->ap = ap->bcnext;
+			if (bcs->ap == NULL)
+				/* last one: stop ev-layer hupD notifications */
+				bcs->chstate &= ~CHS_NOTIFY_LL;
+			return;
+		}
+		for (oap = bcs->ap; oap != NULL; oap = oap->bcnext) {
+			if (oap->bcnext == ap) {
+				oap->bcnext = oap->bcnext->bcnext;
+				return;
+			}
+		}
+		dev_err(cs->dev, "%s: application %u not found\n",
+			__func__, ap->id);
+		return;
+
+	default:		/* Reject */
+		/* drop all competing applications, keep only this one */
+		for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
+			if (oap != ap)
+				send_disconnect_ind(bcs, oap,
+					CapiCallGivenToOtherApplication);
+		ap->bcnext = NULL;
+		bcs->ap = ap;
+
+		/* reject call - will trigger DISCONNECT_IND for this app */
+		dev_info(cs->dev, "%s: Reject=%x\n",
+			 "CONNECT_RESP", cmsg->Reject);
+		if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
+				       EV_HUP, NULL, 0, NULL))
+			return;
+		gig_dbg(DEBUG_CMD, "scheduling HUP");
+		gigaset_schedule_event(cs);
+		return;
+	}
+}
+
+/*
+ * process CONNECT_B3_REQ message
+ * build NCCI and emit CONNECT_B3_CONF reply
+ */
+static void do_connect_b3_req(struct gigaset_capi_ctr *iif,
+			      struct gigaset_capi_appl *ap,
+			      struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	int channel;
+
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+
+	/* extract and check channel number from PLCI */
+	channel = (iif->acmsg.adr.adrPLCI >> 8) & 0xff;
+	if (!channel || channel > cs->channels) {
+		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
+			   "CONNECT_B3_REQ", "PLCI", iif->acmsg.adr.adrPLCI);
+		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
+		return;
+	}
+
+	/* mark logical connection active */
+	ap->connected = APCONN_ACTIVE;
+
+	/* build NCCI: always 1 (one B3 connection only) */
+	iif->acmsg.adr.adrNCCI |= 1 << 16;
+
+	/* NCPI parameter: not applicable for B3 Transparent */
+	ignore_cstruct_param(cs, iif->acmsg.NCPI,
+				"CONNECT_B3_REQ", "NCPI");
+	send_conf(iif, ap, skb,
+		  (iif->acmsg.NCPI && iif->acmsg.NCPI[0]) ?
+			CapiNcpiNotSupportedByProtocol : CapiSuccess);
+}
+
+/*
+ * process CONNECT_B3_RESP message
+ * Depending on the Reject parameter, either emit CONNECT_B3_ACTIVE_IND
+ * or queue EV_HUP and emit DISCONNECT_B3_IND.
+ * The emitted message is always shorter than the received one,
+ * allowing to reuse the skb.
+ */
+static void do_connect_b3_resp(struct gigaset_capi_ctr *iif,
+			       struct gigaset_capi_appl *ap,
+			       struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	struct bc_state *bcs = NULL;
+	int channel;
+	unsigned int msgsize;
+	u8 command;
+
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+
+	/* extract and check channel number and NCCI */
+	channel = (iif->acmsg.adr.adrNCCI >> 8) & 0xff;
+	if (!channel || channel > cs->channels ||
+	    ((iif->acmsg.adr.adrNCCI >> 16) & 0xffff) != 1) {
+		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
+			   "CONNECT_B3_RESP", "NCCI", iif->acmsg.adr.adrNCCI);
+		dev_kfree_skb(skb);
+		return;
+	}
+	bcs = &cs->bcs[channel-1];
+
+	if (iif->acmsg.Reject) {
+		/* Reject: clear B3 connect received flag */
+		ap->connected = APCONN_SETUP;
+
+		/* trigger hangup, causing eventual DISCONNECT_IND */
+		if (!gigaset_add_event(cs, &bcs->at_state,
+				       EV_HUP, NULL, 0, NULL)) {
+			dev_err(cs->dev, "%s: out of memory\n", __func__);
+			dev_kfree_skb(skb);
+			return;
+		}
+		gig_dbg(DEBUG_CMD, "scheduling HUP");
+		gigaset_schedule_event(cs);
+
+		/* emit DISCONNECT_B3_IND */
+		command = CAPI_DISCONNECT_B3;
+		msgsize = CAPI_DISCONNECT_B3_IND_BASELEN;
+	} else {
+		/*
+		 * Accept: emit CONNECT_B3_ACTIVE_IND immediately, as
+		 * we only send CONNECT_B3_IND if the B channel is up
+		 */
+		command = CAPI_CONNECT_B3_ACTIVE;
+		msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
+	}
+	capi_cmsg_header(&iif->acmsg, ap->id, command, CAPI_IND,
+			 ap->nextMessageNumber++, iif->acmsg.adr.adrNCCI);
+	__skb_trim(skb, msgsize);
+	capi_cmsg2message(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
+}
+
+/*
+ * process DISCONNECT_REQ message
+ * schedule EV_HUP and emit DISCONNECT_B3_IND if necessary,
+ * emit DISCONNECT_CONF reply
+ */
+static void do_disconnect_req(struct gigaset_capi_ctr *iif,
+			      struct gigaset_capi_appl *ap,
+			      struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	struct bc_state *bcs;
+	_cmsg *b3cmsg;
+	struct sk_buff *b3skb;
+	int channel;
+
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+
+	/* extract and check channel number from PLCI */
+	channel = (iif->acmsg.adr.adrPLCI >> 8) & 0xff;
+	if (!channel || channel > cs->channels) {
+		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
+			   "DISCONNECT_REQ", "PLCI", iif->acmsg.adr.adrPLCI);
+		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
+		return;
+	}
+	bcs = cs->bcs + channel - 1;
+
+	/* ToDo: process parameter: Additional info */
+	ignore_cmstruct_param(cs, iif->acmsg.AdditionalInfo,
+			      "DISCONNECT_REQ", "Additional Info");
+
+	/* skip if DISCONNECT_IND already sent */
+	if (!ap->connected)
+		return;
+
+	/* check for active logical connection */
+	if (ap->connected >= APCONN_ACTIVE) {
+		/*
+		 * emit DISCONNECT_B3_IND with cause 0x3301
+		 * use separate cmsg structure, as the content of iif->acmsg
+		 * is still needed for creating the _CONF message
+		 */
+		b3cmsg = kmalloc(sizeof(*b3cmsg), GFP_KERNEL);
+		if (!b3cmsg) {
+			dev_err(cs->dev, "%s: out of memory\n", __func__);
+			send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
+			return;
+		}
+		capi_cmsg_header(b3cmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
+				 ap->nextMessageNumber++,
+				 iif->acmsg.adr.adrPLCI | (1 << 16));
+		b3cmsg->Reason_B3 = CapiProtocolErrorLayer1;
+		b3skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_KERNEL);
+		if (b3skb == NULL) {
+			dev_err(cs->dev, "%s: out of memory\n", __func__);
+			send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
+			return;
+		}
+		capi_cmsg2message(b3cmsg,
+			__skb_put(b3skb, CAPI_DISCONNECT_B3_IND_BASELEN));
+		kfree(b3cmsg);
+		capi_ctr_handle_message(&iif->ctr, ap->id, b3skb);
+	}
+
+	/* trigger hangup, causing eventual DISCONNECT_IND */
+	if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
+		return;
+	}
+	gig_dbg(DEBUG_CMD, "scheduling HUP");
+	gigaset_schedule_event(cs);
+
+	/* emit reply */
+	send_conf(iif, ap, skb, CapiSuccess);
+}
+
+/*
+ * process DISCONNECT_B3_REQ message
+ * schedule EV_HUP and emit DISCONNECT_B3_CONF reply
+ */
+static void do_disconnect_b3_req(struct gigaset_capi_ctr *iif,
+				 struct gigaset_capi_appl *ap,
+				 struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	int channel;
+
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+
+	/* extract and check channel number and NCCI */
+	channel = (iif->acmsg.adr.adrNCCI >> 8) & 0xff;
+	if (!channel || channel > cs->channels ||
+	    ((iif->acmsg.adr.adrNCCI >> 16) & 0xffff) != 1) {
+		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
+			   "DISCONNECT_B3_REQ", "NCCI", iif->acmsg.adr.adrNCCI);
+		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
+		return;
+	}
+
+	/* reject if logical connection not active */
+	if (ap->connected < APCONN_ACTIVE) {
+		send_conf(iif, ap, skb,
+			  CapiMessageNotSupportedInCurrentState);
+		return;
+	}
+
+	/* trigger hangup, causing eventual DISCONNECT_B3_IND */
+	if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
+			       EV_HUP, NULL, 0, NULL)) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
+		return;
+	}
+	gig_dbg(DEBUG_CMD, "scheduling HUP");
+	gigaset_schedule_event(cs);
+
+	/* NCPI parameter: not applicable for B3 Transparent */
+	ignore_cstruct_param(cs, iif->acmsg.NCPI,
+				"DISCONNECT_B3_REQ", "NCPI");
+	send_conf(iif, ap, skb,
+		  (iif->acmsg.NCPI && iif->acmsg.NCPI[0]) ?
+			CapiNcpiNotSupportedByProtocol : CapiSuccess);
+}
+
+/*
+ * process DATA_B3_REQ message
+ */
+static void do_data_b3_req(struct gigaset_capi_ctr *iif,
+			   struct gigaset_capi_appl *ap,
+			   struct sk_buff *skb)
+{
+	struct cardstate *cs = iif->ctr.driverdata;
+	int channel = CAPIMSG_PLCI_PART(skb->data);
+	u16 ncci = CAPIMSG_NCCI_PART(skb->data);
+	u16 msglen = CAPIMSG_LEN(skb->data);
+	u16 datalen = CAPIMSG_DATALEN(skb->data);
+	u16 flags = CAPIMSG_FLAGS(skb->data);
+
+	/* frequent message, avoid _cmsg overhead */
+	dump_rawmsg(DEBUG_LLDATA, "DATA_B3_REQ", skb->data);
+
+	gig_dbg(DEBUG_LLDATA,
+		"Receiving data from LL (ch: %d, flg: %x, sz: %d|%d)",
+		channel, flags, msglen, datalen);
+
+	/* check parameters */
+	if (channel == 0 || channel > cs->channels || ncci != 1) {
+		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
+			   "DATA_B3_REQ", "NCCI", CAPIMSG_NCCI(skb->data));
+		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
+		return;
+	}
+	if (msglen != CAPI_DATA_B3_REQ_LEN && msglen != CAPI_DATA_B3_REQ_LEN64)
+		dev_notice(cs->dev, "%s: unexpected length %d\n",
+			   "DATA_B3_REQ", msglen);
+	if (msglen + datalen != skb->len)
+		dev_notice(cs->dev, "%s: length mismatch (%d+%d!=%d)\n",
+			   "DATA_B3_REQ", msglen, datalen, skb->len);
+	if (msglen + datalen > skb->len) {
+		/* message too short for announced data length */
+		send_conf(iif, ap, skb, CapiIllMessageParmCoding); /* ? */
+		return;
+	}
+	if (flags & CAPI_FLAGS_RESERVED) {
+		dev_notice(cs->dev, "%s: reserved flags set (%x)\n",
+			   "DATA_B3_REQ", flags);
+		send_conf(iif, ap, skb, CapiIllMessageParmCoding);
+		return;
+	}
+
+	/* reject if logical connection not active */
+	if (ap->connected < APCONN_ACTIVE) {
+		send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
+		return;
+	}
+
+	/*
+	 * pull CAPI message from skb,
+	 * pass payload data to device-specific module
+	 * CAPI message will be preserved in headroom
+	 */
+	skb_pull(skb, msglen);
+	if (cs->ops->send_skb(&cs->bcs[channel-1], skb) < 0) {
+		send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
+		return;
+	}
+
+	/* DATA_B3_CONF reply will be sent by gigaset_skb_sent() */
+
+	/*
+	 * ToDo: honor unset "delivery confirmation" bit
+	 * (send DATA_B3_CONF immediately?)
+	 */
+}
+
+/*
+ * process RESET_B3_REQ message
+ * just always reply "not supported by current protocol"
+ */
+static void do_reset_b3_req(struct gigaset_capi_ctr *iif,
+			    struct gigaset_capi_appl *ap,
+			    struct sk_buff *skb)
+{
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+	send_conf(iif, ap, skb,
+		  CapiResetProcedureNotSupportedByCurrentProtocol);
+}
+
+/*
+ * dump unsupported/ignored messages at most twice per minute,
+ * some apps send those very frequently
+ */
+static unsigned long ignored_msg_dump_time;
+
+/*
+ * unsupported CAPI message handler
+ */
+static void do_unsupported(struct gigaset_capi_ctr *iif,
+			   struct gigaset_capi_appl *ap,
+			   struct sk_buff *skb)
+{
+	/* decode message */
+	capi_message2cmsg(&iif->acmsg, skb->data);
+	if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000))
+		dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+	send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
+}
+
+/*
+ * CAPI message handler: no-op
+ */
+static void do_nothing(struct gigaset_capi_ctr *iif,
+		       struct gigaset_capi_appl *ap,
+		       struct sk_buff *skb)
+{
+	if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000)) {
+		/* decode message */
+		capi_message2cmsg(&iif->acmsg, skb->data);
+		dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
+	}
+	dev_kfree_skb(skb);
+}
+
+static void do_data_b3_resp(struct gigaset_capi_ctr *iif,
+			    struct gigaset_capi_appl *ap,
+			    struct sk_buff *skb)
+{
+	dump_rawmsg(DEBUG_LLDATA, __func__, skb->data);
+	dev_kfree_skb(skb);
+}
+
+/* table of outgoing CAPI message handlers with lookup function */
+typedef void (*capi_send_handler_t)(struct gigaset_capi_ctr *,
+				    struct gigaset_capi_appl *,
+				    struct sk_buff *);
+
+static struct {
+	u16 cmd;
+	capi_send_handler_t handler;
+} capi_send_handler_table[] = {
+	/* most frequent messages first for faster lookup */
+	{ CAPI_DATA_B3_REQ, do_data_b3_req },
+	{ CAPI_DATA_B3_RESP, do_data_b3_resp },
+
+	{ CAPI_ALERT_REQ, do_alert_req },
+	{ CAPI_CONNECT_ACTIVE_RESP, do_nothing },
+	{ CAPI_CONNECT_B3_ACTIVE_RESP, do_nothing },
+	{ CAPI_CONNECT_B3_REQ, do_connect_b3_req },
+	{ CAPI_CONNECT_B3_RESP, do_connect_b3_resp },
+	{ CAPI_CONNECT_B3_T90_ACTIVE_RESP, do_nothing },
+	{ CAPI_CONNECT_REQ, do_connect_req },
+	{ CAPI_CONNECT_RESP, do_connect_resp },
+	{ CAPI_DISCONNECT_B3_REQ, do_disconnect_b3_req },
+	{ CAPI_DISCONNECT_B3_RESP, do_nothing },
+	{ CAPI_DISCONNECT_REQ, do_disconnect_req },
+	{ CAPI_DISCONNECT_RESP, do_nothing },
+	{ CAPI_FACILITY_REQ, do_facility_req },
+	{ CAPI_FACILITY_RESP, do_nothing },
+	{ CAPI_LISTEN_REQ, do_listen_req },
+	{ CAPI_SELECT_B_PROTOCOL_REQ, do_unsupported },
+	{ CAPI_RESET_B3_REQ, do_reset_b3_req },
+	{ CAPI_RESET_B3_RESP, do_nothing },
+
+	/*
+	 * ToDo: support overlap sending (requires ev-layer state
+	 * machine extension to generate additional ATD commands)
+	 */
+	{ CAPI_INFO_REQ, do_unsupported },
+	{ CAPI_INFO_RESP, do_nothing },
+
+	/*
+	 * ToDo: what's the proper response for these?
+	 */
+	{ CAPI_MANUFACTURER_REQ, do_nothing },
+	{ CAPI_MANUFACTURER_RESP, do_nothing },
+};
+
+/* look up handler */
+static inline capi_send_handler_t lookup_capi_send_handler(const u16 cmd)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(capi_send_handler_table); i++)
+		if (capi_send_handler_table[i].cmd == cmd)
+			return capi_send_handler_table[i].handler;
+	return NULL;
+}
+
+
+/**
+ * gigaset_send_message() - accept a CAPI message from an application
+ * @ctr:	controller descriptor structure.
+ * @skb:	CAPI message.
+ *
+ * Return value: CAPI error code
+ * Note: capidrv (and probably others, too) only uses the return value to
+ * decide whether it has to free the skb (only if result != CAPI_NOERROR (0))
+ */
+static u16 gigaset_send_message(struct capi_ctr *ctr, struct sk_buff *skb)
+{
+	struct gigaset_capi_ctr *iif
+		= container_of(ctr, struct gigaset_capi_ctr, ctr);
+	struct cardstate *cs = ctr->driverdata;
+	struct gigaset_capi_appl *ap;
+	capi_send_handler_t handler;
+
+	/* can only handle linear sk_buffs */
+	if (skb_linearize(skb) < 0) {
+		dev_warn(cs->dev, "%s: skb_linearize failed\n", __func__);
+		return CAPI_MSGOSRESOURCEERR;
+	}
+
+	/* retrieve application data structure */
+	ap = get_appl(iif, CAPIMSG_APPID(skb->data));
+	if (!ap) {
+		dev_notice(cs->dev, "%s: application %u not registered\n",
+			   __func__, CAPIMSG_APPID(skb->data));
+		return CAPI_ILLAPPNR;
+	}
+
+	/* look up command */
+	handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
+	if (!handler) {
+		/* unknown/unsupported message type */
+		if (printk_ratelimit())
+			dev_notice(cs->dev, "%s: unsupported message %u\n",
+				   __func__, CAPIMSG_CMD(skb->data));
+		return CAPI_ILLCMDORSUBCMDORMSGTOSMALL;
+	}
+
+	/* serialize */
+	if (atomic_add_return(1, &iif->sendqlen) > 1) {
+		/* queue behind other messages */
+		skb_queue_tail(&iif->sendqueue, skb);
+		return CAPI_NOERROR;
+	}
+
+	/* process message */
+	handler(iif, ap, skb);
+
+	/* process other messages arrived in the meantime */
+	while (atomic_sub_return(1, &iif->sendqlen) > 0) {
+		skb = skb_dequeue(&iif->sendqueue);
+		if (!skb) {
+			/* should never happen */
+			dev_err(cs->dev, "%s: send queue empty\n", __func__);
+			continue;
+		}
+		ap = get_appl(iif, CAPIMSG_APPID(skb->data));
+		if (!ap) {
+			/* could that happen? */
+			dev_warn(cs->dev, "%s: application %u vanished\n",
+				 __func__, CAPIMSG_APPID(skb->data));
+			continue;
+		}
+		handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
+		if (!handler) {
+			/* should never happen */
+			dev_err(cs->dev, "%s: handler %x vanished\n",
+				__func__, CAPIMSG_CMD(skb->data));
+			continue;
+		}
+		handler(iif, ap, skb);
+	}
+
+	return CAPI_NOERROR;
+}
+
+/**
+ * gigaset_procinfo() - build single line description for controller
+ * @ctr:	controller descriptor structure.
+ *
+ * Return value: pointer to generated string (null terminated)
+ */
+static char *gigaset_procinfo(struct capi_ctr *ctr)
+{
+	return ctr->name;	/* ToDo: more? */
+}
+
+/**
+ * gigaset_ctr_read_proc() - build controller proc file entry
+ * @page:	buffer of PAGE_SIZE bytes for receiving the entry.
+ * @start:	unused.
+ * @off:	unused.
+ * @count:	unused.
+ * @eof:	unused.
+ * @ctr:	controller descriptor structure.
+ *
+ * Return value: length of generated entry
+ */
+static int gigaset_ctr_read_proc(char *page, char **start, off_t off,
+			  int count, int *eof, struct capi_ctr *ctr)
+{
+	struct cardstate *cs = ctr->driverdata;
+	char *s;
+	int i;
+	int len = 0;
+	len += sprintf(page+len, "%-16s %s\n", "name", ctr->name);
+	len += sprintf(page+len, "%-16s %s %s\n", "dev",
+			dev_driver_string(cs->dev), dev_name(cs->dev));
+	len += sprintf(page+len, "%-16s %d\n", "id", cs->myid);
+	if (cs->gotfwver)
+		len += sprintf(page+len, "%-16s %d.%d.%d.%d\n", "firmware",
+			cs->fwver[0], cs->fwver[1], cs->fwver[2], cs->fwver[3]);
+	len += sprintf(page+len, "%-16s %d\n", "channels",
+			cs->channels);
+	len += sprintf(page+len, "%-16s %s\n", "onechannel",
+			cs->onechannel ? "yes" : "no");
+
+	switch (cs->mode) {
+	case M_UNKNOWN:
+		s = "unknown";
+		break;
+	case M_CONFIG:
+		s = "config";
+		break;
+	case M_UNIMODEM:
+		s = "Unimodem";
+		break;
+	case M_CID:
+		s = "CID";
+		break;
+	default:
+		s = "??";
+	}
+	len += sprintf(page+len, "%-16s %s\n", "mode", s);
+
+	switch (cs->mstate) {
+	case MS_UNINITIALIZED:
+		s = "uninitialized";
+		break;
+	case MS_INIT:
+		s = "init";
+		break;
+	case MS_LOCKED:
+		s = "locked";
+		break;
+	case MS_SHUTDOWN:
+		s = "shutdown";
+		break;
+	case MS_RECOVER:
+		s = "recover";
+		break;
+	case MS_READY:
+		s = "ready";
+		break;
+	default:
+		s = "??";
+	}
+	len += sprintf(page+len, "%-16s %s\n", "mstate", s);
+
+	len += sprintf(page+len, "%-16s %s\n", "running",
+			cs->running ? "yes" : "no");
+	len += sprintf(page+len, "%-16s %s\n", "connected",
+			cs->connected ? "yes" : "no");
+	len += sprintf(page+len, "%-16s %s\n", "isdn_up",
+			cs->isdn_up ? "yes" : "no");
+	len += sprintf(page+len, "%-16s %s\n", "cidmode",
+			cs->cidmode ? "yes" : "no");
+
+	for (i = 0; i < cs->channels; i++) {
+		len += sprintf(page+len, "[%d]%-13s %d\n", i, "corrupted",
+				cs->bcs[i].corrupted);
+		len += sprintf(page+len, "[%d]%-13s %d\n", i, "trans_down",
+				cs->bcs[i].trans_down);
+		len += sprintf(page+len, "[%d]%-13s %d\n", i, "trans_up",
+				cs->bcs[i].trans_up);
+		len += sprintf(page+len, "[%d]%-13s %d\n", i, "chstate",
+				cs->bcs[i].chstate);
+		switch (cs->bcs[i].proto2) {
+		case L2_BITSYNC:
+			s = "bitsync";
+			break;
+		case L2_HDLC:
+			s = "HDLC";
+			break;
+		case L2_VOICE:
+			s = "voice";
+			break;
+		default:
+			s = "??";
+		}
+		len += sprintf(page+len, "[%d]%-13s %s\n", i, "proto2", s);
+	}
+	return len;
+}
+
+
+static struct capi_driver capi_driver_gigaset = {
+	.name		= "gigaset",
+	.revision	= "1.0",
+};
+
+/**
+ * gigaset_isdn_register() - register to LL
+ * @cs:		device descriptor structure.
+ * @isdnid:	device name.
+ *
+ * Called by main module to register the device with the LL.
+ *
+ * Return value: 1 for success, 0 for failure
+ */
+int gigaset_isdn_register(struct cardstate *cs, const char *isdnid)
+{
+	struct gigaset_capi_ctr *iif;
+	int rc;
+
+	pr_info("Kernel CAPI interface\n");
+
+	iif = kmalloc(sizeof(*iif), GFP_KERNEL);
+	if (!iif) {
+		pr_err("%s: out of memory\n", __func__);
+		return 0;
+	}
+
+	/* register driver with CAPI (ToDo: what for?) */
+	register_capi_driver(&capi_driver_gigaset);
+
+	/* prepare controller structure */
+	iif->ctr.owner         = THIS_MODULE;
+	iif->ctr.driverdata    = cs;
+	strncpy(iif->ctr.name, isdnid, sizeof(iif->ctr.name));
+	iif->ctr.driver_name   = "gigaset";
+	iif->ctr.load_firmware = gigaset_load_firmware;
+	iif->ctr.reset_ctr     = gigaset_reset_ctr;
+	iif->ctr.register_appl = gigaset_register_appl;
+	iif->ctr.release_appl  = gigaset_release_appl;
+	iif->ctr.send_message  = gigaset_send_message;
+	iif->ctr.procinfo      = gigaset_procinfo;
+	iif->ctr.ctr_read_proc = gigaset_ctr_read_proc;
+	INIT_LIST_HEAD(&iif->appls);
+	skb_queue_head_init(&iif->sendqueue);
+	atomic_set(&iif->sendqlen, 0);
+
+	/* register controller with CAPI */
+	rc = attach_capi_ctr(&iif->ctr);
+	if (rc) {
+		pr_err("attach_capi_ctr failed (%d)\n", rc);
+		unregister_capi_driver(&capi_driver_gigaset);
+		kfree(iif);
+		return 0;
+	}
+
+	cs->iif = iif;
+	cs->hw_hdr_len = CAPI_DATA_B3_REQ_LEN;
+	return 1;
+}
+
+/**
+ * gigaset_isdn_unregister() - unregister from LL
+ * @cs:		device descriptor structure.
+ *
+ * Called by main module to unregister the device from the LL.
+ */
+void gigaset_isdn_unregister(struct cardstate *cs)
+{
+	struct gigaset_capi_ctr *iif = cs->iif;
+
+	detach_capi_ctr(&iif->ctr);
+	kfree(iif);
+	cs->iif = NULL;
+	unregister_capi_driver(&capi_driver_gigaset);
+}