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Subject[PATCH 4/9] isdn4linux: Siemens Gigaset drivers - isdn4linux interface
From: Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>

This patch adds the isdn4linux subsystem interface to the gigaset module.
The isdn4linux subsystem interface handles requests from and notifications
to the isdn4linux subsystem.

Signed-off-by: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
---
drivers/isdn/gigaset/i4l.c | 567 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 567 insertions(+)
--- linux-2.6.16-rc2/drivers/isdn/gigaset/i4l.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16-rc2-gig/drivers/isdn/gigaset/i4l.c 2006-02-11 15:20:26.000000000 +0100
@@ -0,0 +1,567 @@
+/*
+ * 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: i4l.c,v 1.3.2.9 2006/02/04 18:28:16 hjlipp Exp $
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+
+/* == Handling of I4L IO ============================================================================*/
+
+/* writebuf_from_LL
+ * called by LL to transmit data on an open channel
+ * inserts the buffer data into the send queue and starts the transmission
+ * Note that this operation must not sleep!
+ * When the buffer is processed completely, gigaset_skb_sent() should be called.
+ * parameters:
+ * driverID driver ID as assigned by LL
+ * channel channel number
+ * ack if != 0 LL wants to be notified on completion via statcallb(ISDN_STAT_BSENT)
+ * skb skb containing data to send
+ * return value:
+ * number of accepted bytes
+ * 0 if temporarily unable to accept data (out of buffer space)
+ * <0 on error (eg. -EINVAL)
+ */
+static int writebuf_from_LL(int driverID, int channel, int ack, struct sk_buff *skb)
+{
+ struct cardstate *cs;
+ struct bc_state *bcs;
+ unsigned len;
+ unsigned skblen;
+
+ if (!(cs = gigaset_get_cs_by_id(driverID))) {
+ err("%s: invalid driver ID (%d)", __func__, driverID);
+ return -ENODEV;
+ }
+ if (channel < 0 || channel >= cs->channels) {
+ err("%s: invalid channel ID (%d)", __func__, channel);
+ return -ENODEV;
+ }
+ bcs = &cs->bcs[channel];
+ len = skb->len;
+
+ dbg(DEBUG_LLDATA,
+ "Receiving data from LL (id: %d, channel: %d, ack: %d, size: %d)",
+ driverID, channel, ack, len);
+
+ if (!len) {
+ if (ack)
+ warn("not ACKing empty packet from LL");
+ return 0;
+ }
+ if (len > MAX_BUF_SIZE) {
+ err("%s: packet too large (%d bytes)", __func__, channel);
+ return -EINVAL;
+ }
+
+ if (!atomic_read(&cs->connected))
+ return -ENODEV;
+
+ skblen = ack ? len : 0;
+ skb->head[0] = skblen & 0xff;
+ skb->head[1] = skblen >> 8;
+ dbg(DEBUG_MCMD, "skb: len=%u, skblen=%u: %02x %02x", len, skblen,
+ (unsigned) skb->head[0], (unsigned) skb->head[1]);
+
+ /* pass to device-specific module */
+ return cs->ops->send_skb(bcs, skb);
+}
+
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
+{
+ unsigned len;
+ isdn_ctrl response;
+
+ ++bcs->trans_up;
+
+ if (skb->len)
+ warn("%s: skb->len==%d", __func__, skb->len);
+
+ len = (unsigned char) skb->head[0] |
+ (unsigned) (unsigned char) skb->head[1] << 8;
+ if (len) {
+ dbg(DEBUG_MCMD,
+ "Acknowledge sending to LL (id: %d, channel: %d size: %u)",
+ bcs->cs->myid, bcs->channel, len);
+
+ response.driver = bcs->cs->myid;
+ response.command = ISDN_STAT_BSENT;
+ response.arg = bcs->channel;
+ response.parm.length = len;
+ bcs->cs->iif.statcallb(&response);
+ }
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_sent);
+
+/* This function will be called by LL to send commands
+ * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
+ * so don't put too much effort into it.
+ */
+static int command_from_LL(isdn_ctrl *cntrl)
+{
+ struct cardstate *cs = gigaset_get_cs_by_id(cntrl->driver);
+ //isdn_ctrl response;
+ //unsigned long flags;
+ struct bc_state *bcs;
+ int retval = 0;
+ struct setup_parm *sp;
+
+ //dbg(DEBUG_ANY, "Gigaset_HW: Receiving command");
+ gigaset_debugdrivers();
+
+ /* Terminate this call if no device is present. Bt if the command is "ISDN_CMD_LOCK" or
+ * "ISDN_CMD_UNLOCK" then execute it due to the fact that they are device independent !
+ */
+ //FIXME "remove test for &connected"
+ if ((!cs || !atomic_read(&cs->connected))) {
+ warn("LL tried to access unknown device with nr. %d",
+ cntrl->driver);
+ return -ENODEV;
+ }
+
+ switch (cntrl->command) {
+ case ISDN_CMD_IOCTL:
+
+ dbg(DEBUG_ANY, "ISDN_CMD_IOCTL (driver:%d,arg: %ld)",
+ cntrl->driver, cntrl->arg);
+
+ warn("ISDN_CMD_IOCTL is not supported.");
+ return -EINVAL;
+
+ case ISDN_CMD_DIAL:
+ dbg(DEBUG_ANY, "ISDN_CMD_DIAL (driver: %d, channel: %ld, "
+ "phone: %s,ownmsn: %s, si1: %d, si2: %d)",
+ cntrl->driver, cntrl->arg,
+ cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
+ cntrl->parm.setup.si1, cntrl->parm.setup.si2);
+
+ if (cntrl->arg >= cs->channels) {
+ err("invalid channel (%d)", (int) cntrl->arg);
+ return -EINVAL;
+ }
+
+ bcs = cs->bcs + cntrl->arg;
+
+ if (!gigaset_get_channel(bcs)) {
+ err("channel not free");
+ return -EBUSY;
+ }
+
+ sp = kmalloc(sizeof *sp, GFP_ATOMIC);
+ if (!sp) {
+ gigaset_free_channel(bcs);
+ err("ISDN_CMD_DIAL: out of memory");
+ return -ENOMEM;
+ }
+ *sp = cntrl->parm.setup;
+
+ if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp,
+ atomic_read(&bcs->at_state.seq_index),
+ NULL)) {
+ //FIXME what should we do?
+ kfree(sp);
+ gigaset_free_channel(bcs);
+ return -ENOMEM;
+ }
+
+ dbg(DEBUG_CMD, "scheduling DIAL");
+ gigaset_schedule_event(cs);
+ break;
+ case ISDN_CMD_ACCEPTD: //FIXME
+ dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");
+
+ if (cntrl->arg >= cs->channels) {
+ err("invalid channel (%d)", (int) cntrl->arg);
+ return -EINVAL;
+ }
+
+ if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
+ EV_ACCEPT, NULL, 0, NULL)) {
+ //FIXME what should we do?
+ return -ENOMEM;
+ }
+
+ dbg(DEBUG_CMD, "scheduling ACCEPT");
+ gigaset_schedule_event(cs);
+
+ break;
+ case ISDN_CMD_ACCEPTB:
+ dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
+ break;
+ case ISDN_CMD_HANGUP:
+ dbg(DEBUG_ANY,
+ "ISDN_CMD_HANGUP (channel: %d)", (int) cntrl->arg);
+
+ if (cntrl->arg >= cs->channels) {
+ err("ISDN_CMD_HANGUP: invalid channel (%u)",
+ (unsigned) cntrl->arg);
+ return -EINVAL;
+ }
+
+ if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
+ EV_HUP, NULL, 0, NULL)) {
+ //FIXME what should we do?
+ return -ENOMEM;
+ }
+
+ dbg(DEBUG_CMD, "scheduling HUP");
+ gigaset_schedule_event(cs);
+
+ break;
+ case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */ //FIXME
+ dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
+ break;
+ case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */ //FIXME
+ dbg(DEBUG_ANY,
+ "ISDN_CMD_SETEAZ (id:%d, channel: %ld, number: %s)",
+ cntrl->driver, cntrl->arg, cntrl->parm.num);
+ break;
+ case ISDN_CMD_SETL2: /* Set L2 to given protocol */
+ dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (Channel: %ld, Proto: %lx)",
+ cntrl->arg & 0xff, (cntrl->arg >> 8));
+
+ if ((cntrl->arg & 0xff) >= cs->channels) {
+ err("invalid channel (%u)",
+ (unsigned) cntrl->arg & 0xff);
+ return -EINVAL;
+ }
+
+ if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg & 0xff].at_state,
+ EV_PROTO_L2, NULL, cntrl->arg >> 8,
+ NULL)) {
+ //FIXME what should we do?
+ return -ENOMEM;
+ }
+
+ dbg(DEBUG_CMD, "scheduling PROTO_L2");
+ gigaset_schedule_event(cs);
+ break;
+ case ISDN_CMD_SETL3: /* Set L3 to given protocol */
+ dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (Channel: %ld, Proto: %lx)",
+ cntrl->arg & 0xff, (cntrl->arg >> 8));
+
+ if ((cntrl->arg & 0xff) >= cs->channels) {
+ err("invalid channel (%u)",
+ (unsigned) cntrl->arg & 0xff);
+ return -EINVAL;
+ }
+
+ if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
+ err("invalid protocol %lu", cntrl->arg >> 8);
+ return -EINVAL;
+ }
+
+ break;
+ case ISDN_CMD_PROCEED:
+ dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
+ break;
+ case ISDN_CMD_ALERT:
+ dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
+ if (cntrl->arg >= cs->channels) {
+ err("invalid channel (%d)", (int) cntrl->arg);
+ return -EINVAL;
+ }
+ //bcs = cs->bcs + cntrl->arg;
+ //bcs->proto2 = -1;
+ // FIXME
+ break;
+ case ISDN_CMD_REDIR:
+ dbg(DEBUG_ANY, "ISDN_CMD_REDIR"); //FIXME
+ break;
+ case ISDN_CMD_PROT_IO:
+ dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
+ break;
+ case ISDN_CMD_FAXCMD:
+ dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
+ break;
+ case ISDN_CMD_GETL2:
+ dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
+ break;
+ case ISDN_CMD_GETL3:
+ dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
+ break;
+ case ISDN_CMD_GETEAZ:
+ dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
+ break;
+ case ISDN_CMD_SETSIL:
+ dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
+ break;
+ case ISDN_CMD_GETSIL:
+ dbg(DEBUG_ANY, "ISDN_CMD_GETSIL");
+ break;
+ default:
+ err("unknown command %d from LL",
+ cntrl->command);
+ return -EINVAL;
+ }
+
+ return retval;
+}
+
+void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
+{
+ isdn_ctrl command;
+
+ command.driver = cs->myid;
+ command.command = cmd;
+ command.arg = 0;
+ cs->iif.statcallb(&command);
+}
+
+void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
+{
+ isdn_ctrl command;
+
+ command.driver = bcs->cs->myid;
+ command.command = cmd;
+ command.arg = bcs->channel;
+ bcs->cs->iif.statcallb(&command);
+}
+
+int gigaset_isdn_setup_dial(struct at_state_t *at_state, void *data)
+{
+ struct bc_state *bcs = at_state->bcs;
+ unsigned proto;
+ const char *bc;
+ size_t length[AT_NUM];
+ size_t l;
+ int i;
+ struct setup_parm *sp = data;
+
+ switch (bcs->proto2) {
+ case ISDN_PROTO_L2_HDLC:
+ proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+ break;
+ case ISDN_PROTO_L2_TRANS:
+ proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+ break;
+ default:
+ err("invalid protocol: %u", bcs->proto2);
+ return -EINVAL;
+ }
+
+ switch (sp->si1) {
+ case 1: /* audio */
+ bc = "9090A3"; /* 3.1 kHz audio, A-law */
+ break;
+ case 7: /* data */
+ default: /* hope the app knows what it is doing */
+ bc = "8890"; /* unrestricted digital information */
+ }
+ //FIXME add missing si1 values from 1TR6, inspect si2, set HLC/LLC
+
+ length[AT_DIAL ] = 1 + strlen(sp->phone) + 1 + 1;
+ l = strlen(sp->eazmsn);
+ length[AT_MSN ] = l ? 6 + l + 1 + 1 : 0;
+ length[AT_BC ] = 5 + strlen(bc) + 1 + 1;
+ length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
+ length[AT_ISO ] = 6 + 1 + 1 + 1; /* channel: 1 character */
+ length[AT_TYPE ] = 6 + 1 + 1 + 1; /* call type: 1 character */
+ length[AT_HLC ] = 0;
+
+ for (i = 0; i < AT_NUM; ++i) {
+ kfree(bcs->commands[i]);
+ bcs->commands[i] = NULL;
+ if (length[i] &&
+ !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
+ err("out of memory");
+ return -ENOMEM;
+ }
+ }
+
+ /* type = 1: extern, 0: intern, 2: recall, 3: door, 4: centrex */
+ if (sp->phone[0] == '*' && sp->phone[1] == '*') {
+ /* internal call: translate ** prefix to CTP value */
+ snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
+ "D%s\r", sp->phone+2);
+ strncpy(bcs->commands[AT_TYPE], "^SCTP=0\r", length[AT_TYPE]);
+ } else {
+ snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
+ "D%s\r", sp->phone);
+ strncpy(bcs->commands[AT_TYPE], "^SCTP=1\r", length[AT_TYPE]);
+ }
+
+ if (bcs->commands[AT_MSN])
+ snprintf(bcs->commands[AT_MSN], length[AT_MSN], "^SMSN=%s\r", sp->eazmsn);
+ snprintf(bcs->commands[AT_BC ], length[AT_BC ], "^SBC=%s\r", bc);
+ snprintf(bcs->commands[AT_PROTO], length[AT_PROTO], "^SBPR=%u\r", proto);
+ snprintf(bcs->commands[AT_ISO ], length[AT_ISO ], "^SISO=%u\r", (unsigned)bcs->channel + 1);
+
+ return 0;
+}
+
+int gigaset_isdn_setup_accept(struct at_state_t *at_state)
+{
+ unsigned proto;
+ size_t length[AT_NUM];
+ int i;
+ struct bc_state *bcs = at_state->bcs;
+
+ switch (bcs->proto2) {
+ case ISDN_PROTO_L2_HDLC:
+ proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+ break;
+ case ISDN_PROTO_L2_TRANS:
+ proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+ break;
+ default:
+ err("invalid protocol: %u", bcs->proto2);
+ return -EINVAL;
+ }
+
+ length[AT_DIAL ] = 0;
+ length[AT_MSN ] = 0;
+ length[AT_BC ] = 0;
+ length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
+ length[AT_ISO ] = 6 + 1 + 1 + 1; /* channel: 1 character */
+ length[AT_TYPE ] = 0;
+ length[AT_HLC ] = 0;
+
+ for (i = 0; i < AT_NUM; ++i) {
+ kfree(bcs->commands[i]);
+ bcs->commands[i] = NULL;
+ if (length[i] &&
+ !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
+ err("out of memory");
+ return -ENOMEM;
+ }
+ }
+
+ snprintf(bcs->commands[AT_PROTO], length[AT_PROTO], "^SBPR=%u\r", proto);
+ snprintf(bcs->commands[AT_ISO ], length[AT_ISO ], "^SISO=%u\r", (unsigned) bcs->channel + 1);
+
+ return 0;
+}
+
+int gigaset_isdn_icall(struct at_state_t *at_state)
+{
+ struct cardstate *cs = at_state->cs;
+ struct bc_state *bcs = at_state->bcs;
+ isdn_ctrl response;
+ int retval;
+
+ /* fill ICALL structure */
+ response.parm.setup.si1 = 0; /* default: unknown */
+ response.parm.setup.si2 = 0;
+ response.parm.setup.screen = 0; //FIXME how to set these?
+ response.parm.setup.plan = 0;
+ if (!at_state->str_var[STR_ZBC]) {
+ /* no BC (internal call): assume speech, A-law */
+ response.parm.setup.si1 = 1;
+ } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
+ /* unrestricted digital information */
+ response.parm.setup.si1 = 7;
+ } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
+ /* speech, A-law */
+ response.parm.setup.si1 = 1;
+ } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
+ /* 3,1 kHz audio, A-law */
+ response.parm.setup.si1 = 1;
+ response.parm.setup.si2 = 2;
+ } else {
+ warn("RING ignored - unsupported BC %s",
+ at_state->str_var[STR_ZBC]);
+ return ICALL_IGNORE;
+ }
+ if (at_state->str_var[STR_NMBR]) {
+ strncpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
+ sizeof response.parm.setup.phone - 1);
+ response.parm.setup.phone[sizeof response.parm.setup.phone - 1] = 0;
+ } else
+ response.parm.setup.phone[0] = 0;
+ if (at_state->str_var[STR_ZCPN]) {
+ strncpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
+ sizeof response.parm.setup.eazmsn - 1);
+ response.parm.setup.eazmsn[sizeof response.parm.setup.eazmsn - 1] = 0;
+ } else
+ response.parm.setup.eazmsn[0] = 0;
+
+ if (!bcs) {
+ notice("no channel for incoming call");
+ dbg(DEBUG_CMD, "Sending ICALLW");
+ response.command = ISDN_STAT_ICALLW;
+ response.arg = 0; //FIXME
+ } else {
+ dbg(DEBUG_CMD, "Sending ICALL");
+ response.command = ISDN_STAT_ICALL;
+ response.arg = bcs->channel; //FIXME
+ }
+ response.driver = cs->myid;
+ retval = cs->iif.statcallb(&response);
+ dbg(DEBUG_CMD, "Response: %d", retval);
+ switch (retval) {
+ case 0: /* no takers */
+ return ICALL_IGNORE;
+ case 1: /* alerting */
+ bcs->chstate |= CHS_NOTIFY_LL;
+ return ICALL_ACCEPT;
+ case 2: /* reject */
+ return ICALL_REJECT;
+ case 3: /* incomplete */
+ warn("LL requested unsupported feature: Incomplete Number");
+ return ICALL_IGNORE;
+ case 4: /* proceeding */
+ /* Gigaset will send ALERTING anyway.
+ * There doesn't seem to be a way to avoid this.
+ */
+ return ICALL_ACCEPT;
+ case 5: /* deflect */
+ warn("LL requested unsupported feature: Call Deflection");
+ return ICALL_IGNORE;
+ default:
+ err("LL error %d on ICALL", retval);
+ return ICALL_IGNORE;
+ }
+}
+
+/* Set Callback function pointer */
+int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
+{
+ isdn_if *iif = &cs->iif;
+
+ dbg(DEBUG_ANY, "Register driver capabilities to LL");
+
+ //iif->id[sizeof(iif->id) - 1]=0;
+ //strncpy(iif->id, isdnid, sizeof(iif->id) - 1);
+ if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
+ >= sizeof iif->id)
+ return -ENOMEM; //FIXME EINVAL/...??
+
+ iif->owner = THIS_MODULE;
+ iif->channels = cs->channels; /* I am supporting just one channel *//* I was supporting...*/
+ iif->maxbufsize = MAX_BUF_SIZE;
+ iif->features = ISDN_FEATURE_L2_TRANS | /* Our device is very advanced, therefore */
+ ISDN_FEATURE_L2_HDLC |
+#ifdef GIG_X75
+ ISDN_FEATURE_L2_X75I |
+#endif
+ ISDN_FEATURE_L3_TRANS |
+ ISDN_FEATURE_P_EURO;
+ iif->hl_hdrlen = HW_HDR_LEN; /* Area for storing ack */
+ iif->command = command_from_LL;
+ iif->writebuf_skb = writebuf_from_LL;
+ iif->writecmd = NULL; /* Don't support isdnctrl */
+ iif->readstat = NULL; /* Don't support isdnctrl */
+ iif->rcvcallb_skb = NULL; /* Will be set by LL */
+ iif->statcallb = NULL; /* Will be set by LL */
+
+ if (!register_isdn(iif))
+ return 0;
+
+ cs->myid = iif->channels; /* Set my device id */
+ return 1;
+}
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