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linux-pinenote/drivers/isdn/act2000/module.c
Arnaldo Carvalho de Melo d626f62b11 [SK_BUFF]: Introduce skb_copy_from_linear_data{_offset} 
To clearly state the intent of copying from linear sk_buffs, _offset being a
overly long variant but interesting for the sake of saving some bytes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-04-25 22:28:23 -07:00

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/* $Id: module.c,v 1.14.6.4 2001/09/23 22:24:32 kai Exp $
*
* ISDN lowlevel-module for the IBM ISDN-S0 Active 2000.
*
* Author Fritz Elfert
* Copyright by Fritz Elfert <fritz@isdn4linux.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* Thanks to Friedemann Baitinger and IBM Germany
*
*/
#include "act2000.h"
#include "act2000_isa.h"
#include "capi.h"
#include <linux/module.h>
#include <linux/init.h>
static unsigned short act2000_isa_ports[] =
{
0x0200, 0x0240, 0x0280, 0x02c0, 0x0300, 0x0340, 0x0380,
0xcfe0, 0xcfa0, 0xcf60, 0xcf20, 0xcee0, 0xcea0, 0xce60,
};
#define ISA_NRPORTS (sizeof(act2000_isa_ports)/sizeof(unsigned short))
static act2000_card *cards = (act2000_card *) NULL;
/* Parameters to be set by insmod */
static int act_bus = 0;
static int act_port = -1; /* -1 = Autoprobe */
static int act_irq = -1;
static char *act_id = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
MODULE_DESCRIPTION( "ISDN4Linux: Driver for IBM Active 2000 ISDN card");
MODULE_AUTHOR( "Fritz Elfert");
MODULE_LICENSE( "GPL");
MODULE_PARM_DESC(act_bus, "BusType of first card, 1=ISA, 2=MCA, 3=PCMCIA, currently only ISA");
MODULE_PARM_DESC(membase, "Base port address of first card");
MODULE_PARM_DESC(act_irq, "IRQ of first card");
MODULE_PARM_DESC(act_id, "ID-String of first card");
module_param(act_bus, int, 0);
module_param(act_port, int, 0);
module_param(act_irq, int, 0);
module_param(act_id, charp, 0);
static int act2000_addcard(int, int, int, char *);
static act2000_chan *
find_channel(act2000_card *card, int channel)
{
if ((channel >= 0) && (channel < ACT2000_BCH))
return &(card->bch[channel]);
printk(KERN_WARNING "act2000: Invalid channel %d\n", channel);
return NULL;
}
/*
* Free MSN list
*/
static void
act2000_clear_msn(act2000_card *card)
{
struct msn_entry *p = card->msn_list;
struct msn_entry *q;
unsigned long flags;
spin_lock_irqsave(&card->lock, flags);
card->msn_list = NULL;
spin_unlock_irqrestore(&card->lock, flags);
while (p) {
q = p->next;
kfree(p);
p = q;
}
}
/*
* Find an MSN entry in the list.
* If ia5 != 0, return IA5-encoded EAZ, else
* return a bitmask with corresponding bit set.
*/
static __u16
act2000_find_msn(act2000_card *card, char *msn, int ia5)
{
struct msn_entry *p = card->msn_list;
__u8 eaz = '0';
while (p) {
if (!strcmp(p->msn, msn)) {
eaz = p->eaz;
break;
}
p = p->next;
}
if (!ia5)
return (1 << (eaz - '0'));
else
return eaz;
}
/*
* Find an EAZ entry in the list.
* return a string with corresponding msn.
*/
char *
act2000_find_eaz(act2000_card *card, char eaz)
{
struct msn_entry *p = card->msn_list;
while (p) {
if (p->eaz == eaz)
return(p->msn);
p = p->next;
}
return("\0");
}
/*
* Add or delete an MSN to the MSN list
*
* First character of msneaz is EAZ, rest is MSN.
* If length of eazmsn is 1, delete that entry.
*/
static int
act2000_set_msn(act2000_card *card, char *eazmsn)
{
struct msn_entry *p = card->msn_list;
struct msn_entry *q = NULL;
unsigned long flags;
int i;
if (!strlen(eazmsn))
return 0;
if (strlen(eazmsn) > 16)
return -EINVAL;
for (i = 0; i < strlen(eazmsn); i++)
if (!isdigit(eazmsn[i]))
return -EINVAL;
if (strlen(eazmsn) == 1) {
/* Delete a single MSN */
while (p) {
if (p->eaz == eazmsn[0]) {
spin_lock_irqsave(&card->lock, flags);
if (q)
q->next = p->next;
else
card->msn_list = p->next;
spin_unlock_irqrestore(&card->lock, flags);
kfree(p);
printk(KERN_DEBUG
"Mapping for EAZ %c deleted\n",
eazmsn[0]);
return 0;
}
q = p;
p = p->next;
}
return 0;
}
/* Add a single MSN */
while (p) {
/* Found in list, replace MSN */
if (p->eaz == eazmsn[0]) {
spin_lock_irqsave(&card->lock, flags);
strcpy(p->msn, &eazmsn[1]);
spin_unlock_irqrestore(&card->lock, flags);
printk(KERN_DEBUG
"Mapping for EAZ %c changed to %s\n",
eazmsn[0],
&eazmsn[1]);
return 0;
}
p = p->next;
}
/* Not found in list, add new entry */
p = kmalloc(sizeof(msn_entry), GFP_KERNEL);
if (!p)
return -ENOMEM;
p->eaz = eazmsn[0];
strcpy(p->msn, &eazmsn[1]);
p->next = card->msn_list;
spin_lock_irqsave(&card->lock, flags);
card->msn_list = p;
spin_unlock_irqrestore(&card->lock, flags);
printk(KERN_DEBUG
"Mapping %c -> %s added\n",
eazmsn[0],
&eazmsn[1]);
return 0;
}
static void
act2000_transmit(struct work_struct *work)
{
struct act2000_card *card =
container_of(work, struct act2000_card, snd_tq);
switch (card->bus) {
case ACT2000_BUS_ISA:
act2000_isa_send(card);
break;
case ACT2000_BUS_PCMCIA:
case ACT2000_BUS_MCA:
default:
printk(KERN_WARNING
"act2000_transmit: Illegal bustype %d\n", card->bus);
}
}
static void
act2000_receive(struct work_struct *work)
{
struct act2000_card *card =
container_of(work, struct act2000_card, poll_tq);
switch (card->bus) {
case ACT2000_BUS_ISA:
act2000_isa_receive(card);
break;
case ACT2000_BUS_PCMCIA:
case ACT2000_BUS_MCA:
default:
printk(KERN_WARNING
"act2000_receive: Illegal bustype %d\n", card->bus);
}
}
static void
act2000_poll(unsigned long data)
{
act2000_card * card = (act2000_card *)data;
unsigned long flags;
act2000_receive(&card->poll_tq);
spin_lock_irqsave(&card->lock, flags);
mod_timer(&card->ptimer, jiffies+3);
spin_unlock_irqrestore(&card->lock, flags);
}
static int
act2000_command(act2000_card * card, isdn_ctrl * c)
{
ulong a;
act2000_chan *chan;
act2000_cdef cdef;
isdn_ctrl cmd;
char tmp[17];
int ret;
unsigned long flags;
void __user *arg;
switch (c->command) {
case ISDN_CMD_IOCTL:
memcpy(&a, c->parm.num, sizeof(ulong));
arg = (void __user *)a;
switch (c->arg) {
case ACT2000_IOCTL_LOADBOOT:
switch (card->bus) {
case ACT2000_BUS_ISA:
ret = act2000_isa_download(card,
arg);
if (!ret) {
card->flags |= ACT2000_FLAGS_LOADED;
if (!(card->flags & ACT2000_FLAGS_IVALID)) {
card->ptimer.expires = jiffies + 3;
card->ptimer.function = act2000_poll;
card->ptimer.data = (unsigned long)card;
add_timer(&card->ptimer);
}
actcapi_manufacturer_req_errh(card);
}
break;
default:
printk(KERN_WARNING
"act2000: Illegal BUS type %d\n",
card->bus);
ret = -EIO;
}
return ret;
case ACT2000_IOCTL_SETPROTO:
card->ptype = a?ISDN_PTYPE_EURO:ISDN_PTYPE_1TR6;
if (!(card->flags & ACT2000_FLAGS_RUNNING))
return 0;
actcapi_manufacturer_req_net(card);
return 0;
case ACT2000_IOCTL_SETMSN:
if (copy_from_user(tmp, arg,
sizeof(tmp)))
return -EFAULT;
if ((ret = act2000_set_msn(card, tmp)))
return ret;
if (card->flags & ACT2000_FLAGS_RUNNING)
return(actcapi_manufacturer_req_msn(card));
return 0;
case ACT2000_IOCTL_ADDCARD:
if (copy_from_user(&cdef, arg,
sizeof(cdef)))
return -EFAULT;
if (act2000_addcard(cdef.bus, cdef.port, cdef.irq, cdef.id))
return -EIO;
return 0;
case ACT2000_IOCTL_TEST:
if (!(card->flags & ACT2000_FLAGS_RUNNING))
return -ENODEV;
return 0;
default:
return -EINVAL;
}
break;
case ISDN_CMD_DIAL:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
if (!(chan = find_channel(card, c->arg & 0x0f)))
break;
spin_lock_irqsave(&card->lock, flags);
if (chan->fsm_state != ACT2000_STATE_NULL) {
spin_unlock_irqrestore(&card->lock, flags);
printk(KERN_WARNING "Dial on channel with state %d\n",
chan->fsm_state);
return -EBUSY;
}
if (card->ptype == ISDN_PTYPE_EURO)
tmp[0] = act2000_find_msn(card, c->parm.setup.eazmsn, 1);
else
tmp[0] = c->parm.setup.eazmsn[0];
chan->fsm_state = ACT2000_STATE_OCALL;
chan->callref = 0xffff;
spin_unlock_irqrestore(&card->lock, flags);
ret = actcapi_connect_req(card, chan, c->parm.setup.phone,
tmp[0], c->parm.setup.si1,
c->parm.setup.si2);
if (ret) {
cmd.driver = card->myid;
cmd.command = ISDN_STAT_DHUP;
cmd.arg &= 0x0f;
card->interface.statcallb(&cmd);
}
return ret;
case ISDN_CMD_ACCEPTD:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
if (!(chan = find_channel(card, c->arg & 0x0f)))
break;
if (chan->fsm_state == ACT2000_STATE_ICALL)
actcapi_select_b2_protocol_req(card, chan);
return 0;
case ISDN_CMD_ACCEPTB:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
return 0;
case ISDN_CMD_HANGUP:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
if (!(chan = find_channel(card, c->arg & 0x0f)))
break;
switch (chan->fsm_state) {
case ACT2000_STATE_ICALL:
case ACT2000_STATE_BSETUP:
actcapi_connect_resp(card, chan, 0x15);
break;
case ACT2000_STATE_ACTIVE:
actcapi_disconnect_b3_req(card, chan);
break;
}
return 0;
case ISDN_CMD_SETEAZ:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
if (!(chan = find_channel(card, c->arg & 0x0f)))
break;
if (strlen(c->parm.num)) {
if (card->ptype == ISDN_PTYPE_EURO) {
chan->eazmask = act2000_find_msn(card, c->parm.num, 0);
}
if (card->ptype == ISDN_PTYPE_1TR6) {
int i;
chan->eazmask = 0;
for (i = 0; i < strlen(c->parm.num); i++)
if (isdigit(c->parm.num[i]))
chan->eazmask |= (1 << (c->parm.num[i] - '0'));
}
} else
chan->eazmask = 0x3ff;
actcapi_listen_req(card);
return 0;
case ISDN_CMD_CLREAZ:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
if (!(chan = find_channel(card, c->arg & 0x0f)))
break;
chan->eazmask = 0;
actcapi_listen_req(card);
return 0;
case ISDN_CMD_SETL2:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
if (!(chan = find_channel(card, c->arg & 0x0f)))
break;
chan->l2prot = (c->arg >> 8);
return 0;
case ISDN_CMD_SETL3:
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
if ((c->arg >> 8) != ISDN_PROTO_L3_TRANS) {
printk(KERN_WARNING "L3 protocol unknown\n");
return -1;
}
if (!(chan = find_channel(card, c->arg & 0x0f)))
break;
chan->l3prot = (c->arg >> 8);
return 0;
}
return -EINVAL;
}
static int
act2000_sendbuf(act2000_card *card, int channel, int ack, struct sk_buff *skb)
{
struct sk_buff *xmit_skb;
int len;
act2000_chan *chan;
actcapi_msg *msg;
if (!(chan = find_channel(card, channel)))
return -1;
if (chan->fsm_state != ACT2000_STATE_ACTIVE)
return -1;
len = skb->len;
if ((chan->queued + len) >= ACT2000_MAX_QUEUED)
return 0;
if (!len)
return 0;
if (skb_headroom(skb) < 19) {
printk(KERN_WARNING "act2000_sendbuf: Headroom only %d\n",
skb_headroom(skb));
xmit_skb = alloc_skb(len + 19, GFP_ATOMIC);
if (!xmit_skb) {
printk(KERN_WARNING "act2000_sendbuf: Out of memory\n");
return 0;
}
skb_reserve(xmit_skb, 19);
skb_copy_from_linear_data(skb, skb_put(xmit_skb, len), len);
} else {
xmit_skb = skb_clone(skb, GFP_ATOMIC);
if (!xmit_skb) {
printk(KERN_WARNING "act2000_sendbuf: Out of memory\n");
return 0;
}
}
dev_kfree_skb(skb);
msg = (actcapi_msg *)skb_push(xmit_skb, 19);
msg->hdr.len = 19 + len;
msg->hdr.applicationID = 1;
msg->hdr.cmd.cmd = 0x86;
msg->hdr.cmd.subcmd = 0x00;
msg->hdr.msgnum = actcapi_nextsmsg(card);
msg->msg.data_b3_req.datalen = len;
msg->msg.data_b3_req.blocknr = (msg->hdr.msgnum & 0xff);
msg->msg.data_b3_req.fakencci = MAKE_NCCI(chan->plci, 0, chan->ncci);
msg->msg.data_b3_req.flags = ack; /* Will be set to 0 on actual sending */
actcapi_debug_msg(xmit_skb, 1);
chan->queued += len;
skb_queue_tail(&card->sndq, xmit_skb);
act2000_schedule_tx(card);
return len;
}
/* Read the Status-replies from the Interface */
static int
act2000_readstatus(u_char __user * buf, int len, act2000_card * card)
{
int count;
u_char __user *p;
for (p = buf, count = 0; count < len; p++, count++) {
if (card->status_buf_read == card->status_buf_write)
return count;
put_user(*card->status_buf_read++, p);
if (card->status_buf_read > card->status_buf_end)
card->status_buf_read = card->status_buf;
}
return count;
}
/*
* Find card with given driverId
*/
static inline act2000_card *
act2000_findcard(int driverid)
{
act2000_card *p = cards;
while (p) {
if (p->myid == driverid)
return p;
p = p->next;
}
return (act2000_card *) 0;
}
/*
* Wrapper functions for interface to linklevel
*/
static int
if_command(isdn_ctrl * c)
{
act2000_card *card = act2000_findcard(c->driver);
if (card)
return (act2000_command(card, c));
printk(KERN_ERR
"act2000: if_command %d called with invalid driverId %d!\n",
c->command, c->driver);
return -ENODEV;
}
static int
if_writecmd(const u_char __user *buf, int len, int id, int channel)
{
act2000_card *card = act2000_findcard(id);
if (card) {
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
return (len);
}
printk(KERN_ERR
"act2000: if_writecmd called with invalid driverId!\n");
return -ENODEV;
}
static int
if_readstatus(u_char __user * buf, int len, int id, int channel)
{
act2000_card *card = act2000_findcard(id);
if (card) {
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
return (act2000_readstatus(buf, len, card));
}
printk(KERN_ERR
"act2000: if_readstatus called with invalid driverId!\n");
return -ENODEV;
}
static int
if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
{
act2000_card *card = act2000_findcard(id);
if (card) {
if (!card->flags & ACT2000_FLAGS_RUNNING)
return -ENODEV;
return (act2000_sendbuf(card, channel, ack, skb));
}
printk(KERN_ERR
"act2000: if_sendbuf called with invalid driverId!\n");
return -ENODEV;
}
/*
* Allocate a new card-struct, initialize it
* link it into cards-list.
*/
static void
act2000_alloccard(int bus, int port, int irq, char *id)
{
int i;
act2000_card *card;
if (!(card = kzalloc(sizeof(act2000_card), GFP_KERNEL))) {
printk(KERN_WARNING
"act2000: (%s) Could not allocate card-struct.\n", id);
return;
}
spin_lock_init(&card->lock);
spin_lock_init(&card->mnlock);
skb_queue_head_init(&card->sndq);
skb_queue_head_init(&card->rcvq);
skb_queue_head_init(&card->ackq);
INIT_WORK(&card->snd_tq, act2000_transmit);
INIT_WORK(&card->rcv_tq, actcapi_dispatch);
INIT_WORK(&card->poll_tq, act2000_receive);
init_timer(&card->ptimer);
card->interface.owner = THIS_MODULE;
card->interface.channels = ACT2000_BCH;
card->interface.maxbufsize = 4000;
card->interface.command = if_command;
card->interface.writebuf_skb = if_sendbuf;
card->interface.writecmd = if_writecmd;
card->interface.readstat = if_readstatus;
card->interface.features =
ISDN_FEATURE_L2_X75I |
ISDN_FEATURE_L2_HDLC |
ISDN_FEATURE_L3_TRANS |
ISDN_FEATURE_P_UNKNOWN;
card->interface.hl_hdrlen = 20;
card->ptype = ISDN_PTYPE_EURO;
strlcpy(card->interface.id, id, sizeof(card->interface.id));
for (i=0; i<ACT2000_BCH; i++) {
card->bch[i].plci = 0x8000;
card->bch[i].ncci = 0x8000;
card->bch[i].l2prot = ISDN_PROTO_L2_X75I;
card->bch[i].l3prot = ISDN_PROTO_L3_TRANS;
}
card->myid = -1;
card->bus = bus;
card->port = port;
card->irq = irq;
card->next = cards;
cards = card;
}
/*
* register card at linklevel
*/
static int
act2000_registercard(act2000_card * card)
{
switch (card->bus) {
case ACT2000_BUS_ISA:
break;
case ACT2000_BUS_MCA:
case ACT2000_BUS_PCMCIA:
default:
printk(KERN_WARNING
"act2000: Illegal BUS type %d\n",
card->bus);
return -1;
}
if (!register_isdn(&card->interface)) {
printk(KERN_WARNING
"act2000: Unable to register %s\n",
card->interface.id);
return -1;
}
card->myid = card->interface.channels;
sprintf(card->regname, "act2000-isdn (%s)", card->interface.id);
return 0;
}
static void
unregister_card(act2000_card * card)
{
isdn_ctrl cmd;
cmd.command = ISDN_STAT_UNLOAD;
cmd.driver = card->myid;
card->interface.statcallb(&cmd);
switch (card->bus) {
case ACT2000_BUS_ISA:
act2000_isa_release(card);
break;
case ACT2000_BUS_MCA:
case ACT2000_BUS_PCMCIA:
default:
printk(KERN_WARNING
"act2000: Invalid BUS type %d\n",
card->bus);
break;
}
}
static int
act2000_addcard(int bus, int port, int irq, char *id)
{
act2000_card *p;
act2000_card *q = NULL;
int initialized;
int added = 0;
int failed = 0;
int i;
if (!bus)
bus = ACT2000_BUS_ISA;
if (port != -1) {
/* Port defined, do fixed setup */
act2000_alloccard(bus, port, irq, id);
} else {
/* No port defined, perform autoprobing.
* This may result in more than one card detected.
*/
switch (bus) {
case ACT2000_BUS_ISA:
for (i = 0; i < ISA_NRPORTS; i++)
if (act2000_isa_detect(act2000_isa_ports[i])) {
printk(KERN_INFO
"act2000: Detected ISA card at port 0x%x\n",
act2000_isa_ports[i]);
act2000_alloccard(bus, act2000_isa_ports[i], irq, id);
}
break;
case ACT2000_BUS_MCA:
case ACT2000_BUS_PCMCIA:
default:
printk(KERN_WARNING
"act2000: addcard: Invalid BUS type %d\n",
bus);
}
}
if (!cards)
return 1;
p = cards;
while (p) {
initialized = 0;
if (!p->interface.statcallb) {
/* Not yet registered.
* Try to register and activate it.
*/
added++;
switch (p->bus) {
case ACT2000_BUS_ISA:
if (act2000_isa_detect(p->port)) {
if (act2000_registercard(p))
break;
if (act2000_isa_config_port(p, p->port)) {
printk(KERN_WARNING
"act2000: Could not request port 0x%04x\n",
p->port);
unregister_card(p);
p->interface.statcallb = NULL;
break;
}
if (act2000_isa_config_irq(p, p->irq)) {
printk(KERN_INFO
"act2000: No IRQ available, fallback to polling\n");
/* Fall back to polled operation */
p->irq = 0;
}
printk(KERN_INFO
"act2000: ISA"
"-type card at port "
"0x%04x ",
p->port);
if (p->irq)
printk("irq %d\n", p->irq);
else
printk("polled\n");
initialized = 1;
}
break;
case ACT2000_BUS_MCA:
case ACT2000_BUS_PCMCIA:
default:
printk(KERN_WARNING
"act2000: addcard: Invalid BUS type %d\n",
p->bus);
}
} else
/* Card already initialized */
initialized = 1;
if (initialized) {
/* Init OK, next card ... */
q = p;
p = p->next;
} else {
/* Init failed, remove card from list, free memory */
printk(KERN_WARNING
"act2000: Initialization of %s failed\n",
p->interface.id);
if (q) {
q->next = p->next;
kfree(p);
p = q->next;
} else {
cards = p->next;
kfree(p);
p = cards;
}
failed++;
}
}
return (added - failed);
}
#define DRIVERNAME "IBM Active 2000 ISDN driver"
static int __init act2000_init(void)
{
printk(KERN_INFO "%s\n", DRIVERNAME);
if (!cards)
act2000_addcard(act_bus, act_port, act_irq, act_id);
if (!cards)
printk(KERN_INFO "act2000: No cards defined yet\n");
return 0;
}
static void __exit act2000_exit(void)
{
act2000_card *card = cards;
act2000_card *last;
while (card) {
unregister_card(card);
del_timer(&card->ptimer);
card = card->next;
}
card = cards;
while (card) {
last = card;
card = card->next;
act2000_clear_msn(last);
kfree(last);
}
printk(KERN_INFO "%s unloaded\n", DRIVERNAME);
}
module_init(act2000_init);
module_exit(act2000_exit);
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