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linux-next/drivers/net/hamradio/hdlcdrv.c
Micah Dowty ae6134bdf3 hdlcdrv: Fix CRC calculation.
This is a trivial patch against the hdlcdrv module that fixes its CRC
calculation. The finished CRC was overwriting the first two bytes of
each packet rather than being appended to the end.

I've tested this with 2.6.8 and 2.6.10-rc1, but hdlcdrv hasn't changed
much recently so it should work with many other kernel versions.

Signed-off-by: Micah Dowty <micah@navi.cx>
Acked-by: Thomas Sailer <t.sailer@alumni.ethz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-21 10:10:56 -07:00

785 lines
21 KiB
C

/*****************************************************************************/
/*
* hdlcdrv.c -- HDLC packet radio network driver.
*
* Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Please note that the GPL allows you to use the driver, NOT the radio.
* In order to use the radio, you need a license from the communications
* authority of your country.
*
* The driver was derived from Donald Beckers skeleton.c
* Written 1993-94 by Donald Becker.
*
* History:
* 0.1 21.09.1996 Started
* 18.10.1996 Changed to new user space access routines
* (copy_{to,from}_user)
* 0.2 21.11.1996 various small changes
* 0.3 03.03.1997 fixed (hopefully) IP not working with ax.25 as a module
* 0.4 16.04.1997 init code/data tagged
* 0.5 30.07.1997 made HDLC buffers bigger (solves a problem with the
* soundmodem driver)
* 0.6 05.04.1998 add spinlocks
* 0.7 03.08.1999 removed some old compatibility cruft
* 0.8 12.02.2000 adapted to softnet driver interface
*/
/*****************************************************************************/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/hdlcdrv.h>
#include <linux/random.h>
#include <net/ax25.h>
#include <asm/uaccess.h>
#include <linux/crc-ccitt.h>
/* --------------------------------------------------------------------- */
#define KISS_VERBOSE
/* --------------------------------------------------------------------- */
#define PARAM_TXDELAY 1
#define PARAM_PERSIST 2
#define PARAM_SLOTTIME 3
#define PARAM_TXTAIL 4
#define PARAM_FULLDUP 5
#define PARAM_HARDWARE 6
#define PARAM_RETURN 255
/* --------------------------------------------------------------------- */
/*
* the CRC routines are stolen from WAMPES
* by Dieter Deyke
*/
/*---------------------------------------------------------------------------*/
static inline void append_crc_ccitt(unsigned char *buffer, int len)
{
unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
buffer += len;
*buffer++ = crc;
*buffer++ = crc >> 8;
}
/*---------------------------------------------------------------------------*/
static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
{
return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
}
/*---------------------------------------------------------------------------*/
#if 0
static int calc_crc_ccitt(const unsigned char *buf, int cnt)
{
unsigned int crc = 0xffff;
for (; cnt > 0; cnt--)
crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
crc ^= 0xffff;
return (crc & 0xffff);
}
#endif
/* ---------------------------------------------------------------------- */
#define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
/* ---------------------------------------------------------------------- */
/*
* The HDLC routines
*/
static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
int num)
{
int added = 0;
while (s->hdlcrx.rx_state && num >= 8) {
if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
s->hdlcrx.rx_state = 0;
return 0;
}
*s->hdlcrx.bp++ = bits >> (32-num);
s->hdlcrx.len++;
num -= 8;
added += 8;
}
return added;
}
static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
{
struct sk_buff *skb;
int pkt_len;
unsigned char *cp;
if (s->hdlcrx.len < 4)
return;
if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
return;
pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
if (!(skb = dev_alloc_skb(pkt_len))) {
printk("%s: memory squeeze, dropping packet\n", dev->name);
s->stats.rx_dropped++;
return;
}
cp = skb_put(skb, pkt_len);
*cp++ = 0; /* KISS kludge */
memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
skb->protocol = ax25_type_trans(skb, dev);
netif_rx(skb);
dev->last_rx = jiffies;
s->stats.rx_packets++;
}
void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
{
int i;
unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
if (!s || s->magic != HDLCDRV_MAGIC)
return;
if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
return;
while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
#ifdef HDLCDRV_DEBUG
hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
#endif /* HDLCDRV_DEBUG */
s->hdlcrx.bitstream >>= 16;
s->hdlcrx.bitstream |= word << 16;
s->hdlcrx.bitbuf >>= 16;
s->hdlcrx.bitbuf |= word << 16;
s->hdlcrx.numbits += 16;
for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
i >= 0;
i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
if ((s->hdlcrx.bitstream & mask1) == mask1)
s->hdlcrx.rx_state = 0; /* abort received */
else if ((s->hdlcrx.bitstream & mask2) == mask3) {
/* flag received */
if (s->hdlcrx.rx_state) {
hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
<< (8+i),
s->hdlcrx.numbits
-8-i);
hdlc_rx_flag(dev, s);
}
s->hdlcrx.len = 0;
s->hdlcrx.bp = s->hdlcrx.buffer;
s->hdlcrx.rx_state = 1;
s->hdlcrx.numbits = i;
} else if ((s->hdlcrx.bitstream & mask4) == mask5) {
/* stuffed bit */
s->hdlcrx.numbits--;
s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
((s->hdlcrx.bitbuf & mask6) << 1);
}
}
s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
s->hdlcrx.numbits);
}
clear_bit(0, &s->hdlcrx.in_hdlc_rx);
}
/* ---------------------------------------------------------------------- */
static inline void do_kiss_params(struct hdlcdrv_state *s,
unsigned char *data, unsigned long len)
{
#ifdef KISS_VERBOSE
#define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
#else /* KISS_VERBOSE */
#define PKP(a,b)
#endif /* KISS_VERBOSE */
if (len < 2)
return;
switch(data[0]) {
case PARAM_TXDELAY:
s->ch_params.tx_delay = data[1];
PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
break;
case PARAM_PERSIST:
s->ch_params.ppersist = data[1];
PKP("p persistence = %u", s->ch_params.ppersist);
break;
case PARAM_SLOTTIME:
s->ch_params.slottime = data[1];
PKP("slot time = %ums", s->ch_params.slottime);
break;
case PARAM_TXTAIL:
s->ch_params.tx_tail = data[1];
PKP("TX tail = %ums", s->ch_params.tx_tail);
break;
case PARAM_FULLDUP:
s->ch_params.fulldup = !!data[1];
PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
break;
default:
break;
}
#undef PKP
}
/* ---------------------------------------------------------------------- */
void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
{
unsigned int mask1, mask2, mask3;
int i;
struct sk_buff *skb;
int pkt_len;
if (!s || s->magic != HDLCDRV_MAGIC)
return;
if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
return;
for (;;) {
if (s->hdlctx.numbits >= 16) {
if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
clear_bit(0, &s->hdlctx.in_hdlc_tx);
return;
}
hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
s->hdlctx.bitbuf >>= 16;
s->hdlctx.numbits -= 16;
}
switch (s->hdlctx.tx_state) {
default:
clear_bit(0, &s->hdlctx.in_hdlc_tx);
return;
case 0:
case 1:
if (s->hdlctx.numflags) {
s->hdlctx.numflags--;
s->hdlctx.bitbuf |=
0x7e7e << s->hdlctx.numbits;
s->hdlctx.numbits += 16;
break;
}
if (s->hdlctx.tx_state == 1) {
clear_bit(0, &s->hdlctx.in_hdlc_tx);
return;
}
if (!(skb = s->skb)) {
int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
if (flgs < 2)
flgs = 2;
s->hdlctx.tx_state = 1;
s->hdlctx.numflags = flgs;
break;
}
s->skb = NULL;
netif_wake_queue(dev);
pkt_len = skb->len-1; /* strip KISS byte */
if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
s->hdlctx.tx_state = 0;
s->hdlctx.numflags = 1;
dev_kfree_skb_irq(skb);
break;
}
skb_copy_from_linear_data_offset(skb, 1,
s->hdlctx.buffer,
pkt_len);
dev_kfree_skb_irq(skb);
s->hdlctx.bp = s->hdlctx.buffer;
append_crc_ccitt(s->hdlctx.buffer, pkt_len);
s->hdlctx.len = pkt_len+2; /* the appended CRC */
s->hdlctx.tx_state = 2;
s->hdlctx.bitstream = 0;
s->stats.tx_packets++;
break;
case 2:
if (!s->hdlctx.len) {
s->hdlctx.tx_state = 0;
s->hdlctx.numflags = 1;
break;
}
s->hdlctx.len--;
s->hdlctx.bitbuf |= *s->hdlctx.bp <<
s->hdlctx.numbits;
s->hdlctx.bitstream >>= 8;
s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
mask1 = 0x1f000;
mask2 = 0x10000;
mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
s->hdlctx.numbits += 8;
for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
mask3 = (mask3 << 1) | 1) {
if ((s->hdlctx.bitstream & mask1) != mask1)
continue;
s->hdlctx.bitstream &= ~mask2;
s->hdlctx.bitbuf =
(s->hdlctx.bitbuf & mask3) |
((s->hdlctx.bitbuf &
(~mask3)) << 1);
s->hdlctx.numbits++;
mask3 = (mask3 << 1) | 1;
}
break;
}
}
}
/* ---------------------------------------------------------------------- */
static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
{
s->hdlctx.tx_state = 0;
s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
hdlcdrv_transmitter(dev, s);
s->hdlctx.ptt = 1;
s->ptt_keyed++;
}
/* ---------------------------------------------------------------------- */
void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
{
if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
return;
if (s->ch_params.fulldup) {
start_tx(dev, s);
return;
}
if (s->hdlcrx.dcd) {
s->hdlctx.slotcnt = s->ch_params.slottime;
return;
}
if ((--s->hdlctx.slotcnt) > 0)
return;
s->hdlctx.slotcnt = s->ch_params.slottime;
if ((random32() % 256) > s->ch_params.ppersist)
return;
start_tx(dev, s);
}
/* --------------------------------------------------------------------- */
/*
* ===================== network driver interface =========================
*/
static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
{
struct hdlcdrv_state *sm = netdev_priv(dev);
if (skb->data[0] != 0) {
do_kiss_params(sm, skb->data, skb->len);
dev_kfree_skb(skb);
return 0;
}
if (sm->skb)
return -1;
netif_stop_queue(dev);
sm->skb = skb;
return 0;
}
/* --------------------------------------------------------------------- */
static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
{
struct sockaddr *sa = (struct sockaddr *)addr;
/* addr is an AX.25 shifted ASCII mac address */
memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
return 0;
}
/* --------------------------------------------------------------------- */
static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
{
struct hdlcdrv_state *sm = netdev_priv(dev);
/*
* Get the current statistics. This may be called with the
* card open or closed.
*/
return &sm->stats;
}
/* --------------------------------------------------------------------- */
/*
* Open/initialize the board. This is called (in the current kernel)
* sometime after booting when the 'ifconfig' program is run.
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is non-reboot way to recover if something goes wrong.
*/
static int hdlcdrv_open(struct net_device *dev)
{
struct hdlcdrv_state *s = netdev_priv(dev);
int i;
if (!s->ops || !s->ops->open)
return -ENODEV;
/*
* initialise some variables
*/
s->opened = 1;
s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
s->hdlcrx.in_hdlc_rx = 0;
s->hdlcrx.rx_state = 0;
s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
s->hdlctx.in_hdlc_tx = 0;
s->hdlctx.tx_state = 1;
s->hdlctx.numflags = 0;
s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
s->hdlctx.ptt = 0;
s->hdlctx.slotcnt = s->ch_params.slottime;
s->hdlctx.calibrate = 0;
i = s->ops->open(dev);
if (i)
return i;
netif_start_queue(dev);
return 0;
}
/* --------------------------------------------------------------------- */
/*
* The inverse routine to hdlcdrv_open().
*/
static int hdlcdrv_close(struct net_device *dev)
{
struct hdlcdrv_state *s = netdev_priv(dev);
int i = 0;
netif_stop_queue(dev);
if (s->ops && s->ops->close)
i = s->ops->close(dev);
if (s->skb)
dev_kfree_skb(s->skb);
s->skb = NULL;
s->opened = 0;
return i;
}
/* --------------------------------------------------------------------- */
static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct hdlcdrv_state *s = netdev_priv(dev);
struct hdlcdrv_ioctl bi;
if (cmd != SIOCDEVPRIVATE) {
if (s->ops && s->ops->ioctl)
return s->ops->ioctl(dev, ifr, &bi, cmd);
return -ENOIOCTLCMD;
}
if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
return -EFAULT;
switch (bi.cmd) {
default:
if (s->ops && s->ops->ioctl)
return s->ops->ioctl(dev, ifr, &bi, cmd);
return -ENOIOCTLCMD;
case HDLCDRVCTL_GETCHANNELPAR:
bi.data.cp.tx_delay = s->ch_params.tx_delay;
bi.data.cp.tx_tail = s->ch_params.tx_tail;
bi.data.cp.slottime = s->ch_params.slottime;
bi.data.cp.ppersist = s->ch_params.ppersist;
bi.data.cp.fulldup = s->ch_params.fulldup;
break;
case HDLCDRVCTL_SETCHANNELPAR:
if (!capable(CAP_NET_ADMIN))
return -EACCES;
s->ch_params.tx_delay = bi.data.cp.tx_delay;
s->ch_params.tx_tail = bi.data.cp.tx_tail;
s->ch_params.slottime = bi.data.cp.slottime;
s->ch_params.ppersist = bi.data.cp.ppersist;
s->ch_params.fulldup = bi.data.cp.fulldup;
s->hdlctx.slotcnt = 1;
return 0;
case HDLCDRVCTL_GETMODEMPAR:
bi.data.mp.iobase = dev->base_addr;
bi.data.mp.irq = dev->irq;
bi.data.mp.dma = dev->dma;
bi.data.mp.dma2 = s->ptt_out.dma2;
bi.data.mp.seriobase = s->ptt_out.seriobase;
bi.data.mp.pariobase = s->ptt_out.pariobase;
bi.data.mp.midiiobase = s->ptt_out.midiiobase;
break;
case HDLCDRVCTL_SETMODEMPAR:
if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
return -EACCES;
dev->base_addr = bi.data.mp.iobase;
dev->irq = bi.data.mp.irq;
dev->dma = bi.data.mp.dma;
s->ptt_out.dma2 = bi.data.mp.dma2;
s->ptt_out.seriobase = bi.data.mp.seriobase;
s->ptt_out.pariobase = bi.data.mp.pariobase;
s->ptt_out.midiiobase = bi.data.mp.midiiobase;
return 0;
case HDLCDRVCTL_GETSTAT:
bi.data.cs.ptt = hdlcdrv_ptt(s);
bi.data.cs.dcd = s->hdlcrx.dcd;
bi.data.cs.ptt_keyed = s->ptt_keyed;
bi.data.cs.tx_packets = s->stats.tx_packets;
bi.data.cs.tx_errors = s->stats.tx_errors;
bi.data.cs.rx_packets = s->stats.rx_packets;
bi.data.cs.rx_errors = s->stats.rx_errors;
break;
case HDLCDRVCTL_OLDGETSTAT:
bi.data.ocs.ptt = hdlcdrv_ptt(s);
bi.data.ocs.dcd = s->hdlcrx.dcd;
bi.data.ocs.ptt_keyed = s->ptt_keyed;
break;
case HDLCDRVCTL_CALIBRATE:
if(!capable(CAP_SYS_RAWIO))
return -EPERM;
s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
return 0;
case HDLCDRVCTL_GETSAMPLES:
#ifndef HDLCDRV_DEBUG
return -EPERM;
#else /* HDLCDRV_DEBUG */
if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
return -EAGAIN;
bi.data.bits =
s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
sizeof(s->bitbuf_channel.buffer);
break;
#endif /* HDLCDRV_DEBUG */
case HDLCDRVCTL_GETBITS:
#ifndef HDLCDRV_DEBUG
return -EPERM;
#else /* HDLCDRV_DEBUG */
if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
return -EAGAIN;
bi.data.bits =
s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
sizeof(s->bitbuf_hdlc.buffer);
break;
#endif /* HDLCDRV_DEBUG */
case HDLCDRVCTL_DRIVERNAME:
if (s->ops && s->ops->drvname) {
strncpy(bi.data.drivername, s->ops->drvname,
sizeof(bi.data.drivername));
break;
}
bi.data.drivername[0] = '\0';
break;
}
if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
return -EFAULT;
return 0;
}
/* --------------------------------------------------------------------- */
/*
* Initialize fields in hdlcdrv
*/
static void hdlcdrv_setup(struct net_device *dev)
{
static const struct hdlcdrv_channel_params dflt_ch_params = {
20, 2, 10, 40, 0
};
struct hdlcdrv_state *s = netdev_priv(dev);
/*
* initialize the hdlcdrv_state struct
*/
s->ch_params = dflt_ch_params;
s->ptt_keyed = 0;
spin_lock_init(&s->hdlcrx.hbuf.lock);
s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
s->hdlcrx.in_hdlc_rx = 0;
s->hdlcrx.rx_state = 0;
spin_lock_init(&s->hdlctx.hbuf.lock);
s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
s->hdlctx.in_hdlc_tx = 0;
s->hdlctx.tx_state = 1;
s->hdlctx.numflags = 0;
s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
s->hdlctx.ptt = 0;
s->hdlctx.slotcnt = s->ch_params.slottime;
s->hdlctx.calibrate = 0;
#ifdef HDLCDRV_DEBUG
s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
s->bitbuf_channel.shreg = 0x80;
s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
s->bitbuf_hdlc.shreg = 0x80;
#endif /* HDLCDRV_DEBUG */
/*
* initialize the device struct
*/
dev->open = hdlcdrv_open;
dev->stop = hdlcdrv_close;
dev->do_ioctl = hdlcdrv_ioctl;
dev->hard_start_xmit = hdlcdrv_send_packet;
dev->get_stats = hdlcdrv_get_stats;
/* Fill in the fields of the device structure */
s->skb = NULL;
dev->header_ops = &ax25_header_ops;
dev->set_mac_address = hdlcdrv_set_mac_address;
dev->type = ARPHRD_AX25; /* AF_AX25 device */
dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
dev->tx_queue_len = 16;
}
/* --------------------------------------------------------------------- */
struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
unsigned int privsize, const char *ifname,
unsigned int baseaddr, unsigned int irq,
unsigned int dma)
{
struct net_device *dev;
struct hdlcdrv_state *s;
int err;
BUG_ON(ops == NULL);
if (privsize < sizeof(struct hdlcdrv_state))
privsize = sizeof(struct hdlcdrv_state);
dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
if (!dev)
return ERR_PTR(-ENOMEM);
/*
* initialize part of the hdlcdrv_state struct
*/
s = netdev_priv(dev);
s->magic = HDLCDRV_MAGIC;
s->ops = ops;
dev->base_addr = baseaddr;
dev->irq = irq;
dev->dma = dma;
err = register_netdev(dev);
if (err < 0) {
printk(KERN_WARNING "hdlcdrv: cannot register net "
"device %s\n", dev->name);
free_netdev(dev);
dev = ERR_PTR(err);
}
return dev;
}
/* --------------------------------------------------------------------- */
void hdlcdrv_unregister(struct net_device *dev)
{
struct hdlcdrv_state *s = netdev_priv(dev);
BUG_ON(s->magic != HDLCDRV_MAGIC);
if (s->opened && s->ops->close)
s->ops->close(dev);
unregister_netdev(dev);
free_netdev(dev);
}
/* --------------------------------------------------------------------- */
EXPORT_SYMBOL(hdlcdrv_receiver);
EXPORT_SYMBOL(hdlcdrv_transmitter);
EXPORT_SYMBOL(hdlcdrv_arbitrate);
EXPORT_SYMBOL(hdlcdrv_register);
EXPORT_SYMBOL(hdlcdrv_unregister);
/* --------------------------------------------------------------------- */
static int __init hdlcdrv_init_driver(void)
{
printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
return 0;
}
/* --------------------------------------------------------------------- */
static void __exit hdlcdrv_cleanup_driver(void)
{
printk(KERN_INFO "hdlcdrv: cleanup\n");
}
/* --------------------------------------------------------------------- */
MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
MODULE_LICENSE("GPL");
module_init(hdlcdrv_init_driver);
module_exit(hdlcdrv_cleanup_driver);
/* --------------------------------------------------------------------- */