Release 4.7 drivers/staging/i4l/pcbit/callbacks.c
/*
* Callbacks for the FSM
*
* Copyright (C) 1996 Universidade de Lisboa
*
* Written by Pedro Roque Marques (roque@di.fc.ul.pt)
*
* This software may be used and distributed according to the terms of
* the GNU General Public License, incorporated herein by reference.
*/
/*
* Fix: 19981230 - Carlos Morgado <chbm@techie.com>
* Port of Nelson Escravana's <nelson.escravana@usa.net> fix to CalledPN
* NULL pointer dereference in cb_in_1 (originally fixed in 2.0)
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/skbuff.h>
#include <asm/io.h>
#include <linux/isdnif.h>
#include "pcbit.h"
#include "layer2.h"
#include "edss1.h"
#include "callbacks.h"
#include "capi.h"
ushort last_ref_num = 1;
/*
* send_conn_req
*
*/
void cb_out_1(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *cbdata)
{
struct sk_buff *skb;
int len;
ushort refnum;
#ifdef DEBUG
printk(KERN_DEBUG "Called Party Number: %s\n",
cbdata->data.setup.CalledPN);
#endif
/*
* hdr - kmalloc in capi_conn_req
* - kfree when msg has been sent
*/
if ((len = capi_conn_req(cbdata->data.setup.CalledPN, &skb,
chan->proto)) < 0)
{
printk("capi_conn_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->callref = 0;
chan->layer2link = 0;
chan->snum = 0;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_CONN_REQ, refnum, skb, len);
}
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/*
* rcv CONNECT
* will go into ACTIVE state
* send CONN_ACTIVE_RESP
* send Select protocol request
*/
void cb_out_2(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
isdn_ctrl ictl;
struct sk_buff *skb;
int len;
ushort refnum;
if ((len = capi_conn_active_resp(chan, &skb)) < 0)
{
printk("capi_conn_active_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_CONN_ACTV_RESP, refnum, skb, len);
ictl.command = ISDN_STAT_DCONN;
ictl.driver = dev->id;
ictl.arg = chan->id;
dev->dev_if->statcallb(&ictl);
/* ACTIVE D-channel */
/* Select protocol */
if ((len = capi_select_proto_req(chan, &skb, 1 /*outgoing*/)) < 0) {
printk("capi_select_proto_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_SELP_REQ, refnum, skb, len);
}
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/*
* Incoming call received
* inform user
*/
void cb_in_1(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *cbdata)
{
isdn_ctrl ictl;
unsigned short refnum;
struct sk_buff *skb;
int len;
ictl.command = ISDN_STAT_ICALL;
ictl.driver = dev->id;
ictl.arg = chan->id;
/*
* ictl.num >= strlen() + strlen() + 5
*/
if (cbdata->data.setup.CallingPN == NULL) {
printk(KERN_DEBUG "NULL CallingPN to phone; using 0\n");
strcpy(ictl.parm.setup.phone, "0");
}
else {
strcpy(ictl.parm.setup.phone, cbdata->data.setup.CallingPN);
}
if (cbdata->data.setup.CalledPN == NULL) {
printk(KERN_DEBUG "NULL CalledPN to eazmsn; using 0\n");
strcpy(ictl.parm.setup.eazmsn, "0");
}
else {
strcpy(ictl.parm.setup.eazmsn, cbdata->data.setup.CalledPN);
}
ictl.parm.setup.si1 = 7;
ictl.parm.setup.si2 = 0;
ictl.parm.setup.plan = 0;
ictl.parm.setup.screen = 0;
#ifdef DEBUG
printk(KERN_DEBUG "statstr: %s\n", ictl.num);
#endif
dev->dev_if->statcallb(&ictl);
if ((len = capi_conn_resp(chan, &skb)) < 0) {
printk(KERN_DEBUG "capi_conn_resp failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_CONN_RESP, refnum, skb, len);
}
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/*
* user has replied
* open the channel
* send CONNECT message CONNECT_ACTIVE_REQ in CAPI
*/
void cb_in_2(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
unsigned short refnum;
struct sk_buff *skb;
int len;
if ((len = capi_conn_active_req(chan, &skb)) < 0) {
printk(KERN_DEBUG "capi_conn_active_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
printk(KERN_DEBUG "sending MSG_CONN_ACTV_REQ\n");
pcbit_l2_write(dev, MSG_CONN_ACTV_REQ, refnum, skb, len);
}
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/*
* CONN_ACK arrived
* start b-proto selection
*
*/
void cb_in_3(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
unsigned short refnum;
struct sk_buff *skb;
int len;
if ((len = capi_select_proto_req(chan, &skb, 0 /*incoming*/)) < 0)
{
printk("capi_select_proto_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_SELP_REQ, refnum, skb, len);
}
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/*
* Received disconnect ind on active state
* send disconnect resp
* send msg to user
*/
void cb_disc_1(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
struct sk_buff *skb;
int len;
ushort refnum;
isdn_ctrl ictl;
if ((len = capi_disc_resp(chan, &skb)) < 0) {
printk("capi_disc_resp failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_DISC_RESP, refnum, skb, len);
ictl.command = ISDN_STAT_BHUP;
ictl.driver = dev->id;
ictl.arg = chan->id;
dev->dev_if->statcallb(&ictl);
}
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/*
* User HANGUP on active/call proceeding state
* send disc.req
*/
void cb_disc_2(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
struct sk_buff *skb;
int len;
ushort refnum;
if ((len = capi_disc_req(chan->callref, &skb, CAUSE_NORMAL)) < 0)
{
printk("capi_disc_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_DISC_REQ, refnum, skb, len);
}
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/*
* Disc confirm received send BHUP
* Problem: when the HL driver sends the disc req itself
* LL receives BHUP
*/
void cb_disc_3(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
isdn_ctrl ictl;
ictl.command = ISDN_STAT_BHUP;
ictl.driver = dev->id;
ictl.arg = chan->id;
dev->dev_if->statcallb(&ictl);
}
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void cb_notdone(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
}
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/*
* send activate b-chan protocol
*/
void cb_selp_1(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
struct sk_buff *skb;
int len;
ushort refnum;
if ((len = capi_activate_transp_req(chan, &skb)) < 0)
{
printk("capi_conn_activate_transp_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_ACT_TRANSP_REQ, refnum, skb, len);
}
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/*
* Inform User that the B-channel is available
*/
void cb_open(struct pcbit_dev *dev, struct pcbit_chan *chan,
struct callb_data *data)
{
isdn_ctrl ictl;
ictl.command = ISDN_STAT_BCONN;
ictl.driver = dev->id;
ictl.arg = chan->id;
dev->dev_if->statcallb(&ictl);
}
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