android_kernel_motorola_sm6225/drivers/isdn/gigaset/i4l.c
Tilman Schmidt 73a8881454 [PATCH] isdn4linux: Siemens Gigaset base driver: fix disconnect handling
Fix a possible Oops in the Siemens Gigaset base driver when the device is
unplugged while an ISDN connection is still active, and makes sure that the
isdn4linux link level (LL) is properly informed if a connection is broken
by the USB cable being unplugged.

- Avoid unsafe checks of URB status fields outside the URB completion
  handlers, keep track of in-use URBs myself instead.

- If an isochronous transfer URB completes with status==0, also check the
  status of the frame descriptors.

- Verify length of interrupt messages received from the device.

- Align the length limit on transmitted AT commands with the device
  documentation.

- In case of AT response receive overrun, keep newly arrived instead of old
  unread data.

- Remove redundant check of device ID in the USB probe function.

- Correct and improve some comments and formatting.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Acked-by: Hansjoerg Lipp <hjlipp@web.de>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-04-22 09:19:52 -07:00

574 lines
16 KiB
C

/*
* Stuff used by all variants of the driver
*
* Copyright (c) 2001 by Stefan Eilers,
* 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.
* =====================================================================
*/
#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;
gig_dbg(DEBUG_LLDATA,
"Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
driverID, channel, ack, len);
if (!len) {
if (ack)
notice("%s: not ACKing empty packet", __func__);
return 0;
}
if (len > MAX_BUF_SIZE) {
err("%s: packet too large (%d bytes)", __func__, len);
return -EINVAL;
}
skblen = ack ? len : 0;
skb->head[0] = skblen & 0xff;
skb->head[1] = skblen >> 8;
gig_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)
dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
__func__, skb->len);
len = (unsigned char) skb->head[0] |
(unsigned) (unsigned char) skb->head[1] << 8;
if (len) {
gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %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;
unsigned param;
unsigned long flags;
gigaset_debugdrivers();
if (!cs) {
warn("LL tried to access unknown device with nr. %d",
cntrl->driver);
return -ENODEV;
}
switch (cntrl->command) {
case ISDN_CMD_IOCTL:
gig_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:
gig_dbg(DEBUG_ANY,
"ISDN_CMD_DIAL (driver: %d, ch: %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("ISDN_CMD_DIAL: invalid channel (%d)",
(int) cntrl->arg);
return -EINVAL;
}
bcs = cs->bcs + cntrl->arg;
if (!gigaset_get_channel(bcs)) {
err("ISDN_CMD_DIAL: 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;
spin_lock_irqsave(&cs->lock, flags);
param = bcs->at_state.seq_index;
spin_unlock_irqrestore(&cs->lock, flags);
if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp, param,
NULL)) {
//FIXME what should we do?
kfree(sp);
gigaset_free_channel(bcs);
return -ENOMEM;
}
gig_dbg(DEBUG_CMD, "scheduling DIAL");
gigaset_schedule_event(cs);
break;
case ISDN_CMD_ACCEPTD: //FIXME
gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");
if (cntrl->arg >= cs->channels) {
err("ISDN_CMD_ACCEPTD: 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;
}
gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
gigaset_schedule_event(cs);
break;
case ISDN_CMD_ACCEPTB:
gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
break;
case ISDN_CMD_HANGUP:
gig_dbg(DEBUG_ANY, "ISDN_CMD_HANGUP (ch: %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;
}
gig_dbg(DEBUG_CMD, "scheduling HUP");
gigaset_schedule_event(cs);
break;
case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */ //FIXME
gig_dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
break;
case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */ //FIXME
gig_dbg(DEBUG_ANY,
"ISDN_CMD_SETEAZ (id: %d, ch: %ld, number: %s)",
cntrl->driver, cntrl->arg, cntrl->parm.num);
break;
case ISDN_CMD_SETL2: /* Set L2 to given protocol */
gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (ch: %ld, proto: %lx)",
cntrl->arg & 0xff, (cntrl->arg >> 8));
if ((cntrl->arg & 0xff) >= cs->channels) {
err("ISDN_CMD_SETL2: 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;
}
gig_dbg(DEBUG_CMD, "scheduling PROTO_L2");
gigaset_schedule_event(cs);
break;
case ISDN_CMD_SETL3: /* Set L3 to given protocol */
gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (ch: %ld, proto: %lx)",
cntrl->arg & 0xff, (cntrl->arg >> 8));
if ((cntrl->arg & 0xff) >= cs->channels) {
err("ISDN_CMD_SETL3: invalid channel (%u)",
(unsigned) cntrl->arg & 0xff);
return -EINVAL;
}
if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
err("ISDN_CMD_SETL3: invalid protocol %lu",
cntrl->arg >> 8);
return -EINVAL;
}
break;
case ISDN_CMD_PROCEED:
gig_dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
break;
case ISDN_CMD_ALERT:
gig_dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
if (cntrl->arg >= cs->channels) {
err("ISDN_CMD_ALERT: invalid channel (%d)",
(int) cntrl->arg);
return -EINVAL;
}
//bcs = cs->bcs + cntrl->arg;
//bcs->proto2 = -1;
// FIXME
break;
case ISDN_CMD_REDIR:
gig_dbg(DEBUG_ANY, "ISDN_CMD_REDIR"); //FIXME
break;
case ISDN_CMD_PROT_IO:
gig_dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
break;
case ISDN_CMD_FAXCMD:
gig_dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
break;
case ISDN_CMD_GETL2:
gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
break;
case ISDN_CMD_GETL3:
gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
break;
case ISDN_CMD_GETEAZ:
gig_dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
break;
case ISDN_CMD_SETSIL:
gig_dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
break;
case ISDN_CMD_GETSIL:
gig_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:
dev_err(bcs->cs->dev, "%s: invalid L2 protocol: %u\n",
__func__, 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))) {
dev_err(bcs->cs->dev, "out of memory\n");
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:
dev_err(at_state->cs->dev, "%s: invalid protocol: %u\n",
__func__, 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))) {
dev_err(at_state->cs->dev, "out of memory\n");
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 {
dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
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) {
dev_notice(cs->dev, "no channel for incoming call\n");
response.command = ISDN_STAT_ICALLW;
response.arg = 0; //FIXME
} else {
gig_dbg(DEBUG_CMD, "Sending ICALL");
response.command = ISDN_STAT_ICALL;
response.arg = bcs->channel; //FIXME
}
response.driver = cs->myid;
retval = cs->iif.statcallb(&response);
gig_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 */
dev_warn(cs->dev,
"LL requested unsupported feature: Incomplete Number\n");
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 */
dev_warn(cs->dev,
"LL requested unsupported feature: Call Deflection\n");
return ICALL_IGNORE;
default:
dev_err(cs->dev, "LL error %d on ICALL\n", retval);
return ICALL_IGNORE;
}
}
/* Set Callback function pointer */
int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
{
isdn_if *iif = &cs->iif;
gig_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;
iif->maxbufsize = MAX_BUF_SIZE;
iif->features = ISDN_FEATURE_L2_TRANS |
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;
}