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/*****************************************************************************/
/*
* 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/config.h>
#include <linux/version.h>
#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 <asm/bitops.h>
#include <asm/uaccess.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/hdlcdrv.h>
/* prototypes for ax25_encapsulate and ax25_rebuild_header */
#include <net/ax25.h>
/* make genksyms happy */
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/tcp.h>
/* --------------------------------------------------------------------- */
/*
* The name of the card. Is used for messages and in the requests for
* io regions, irqs and dma channels
*/
static char ax25_bcast[AX25_ADDR_LEN] =
{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
static char ax25_nocall[AX25_ADDR_LEN] =
{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
/* --------------------------------------------------------------------- */
#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 const unsigned short crc_ccitt_table[] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
/*---------------------------------------------------------------------------*/
static inline void append_crc_ccitt(unsigned char *buffer, int len)
{
unsigned int crc = 0xffff;
for (;len>0;len--)
crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
crc ^= 0xffff;
*buffer++ = crc;
*buffer++ = crc >> 8;
}
/*---------------------------------------------------------------------------*/
static inline int check_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];
return (crc & 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;
}
skb->dev = dev;
cp = skb_put(skb, pkt_len);
*cp++ = 0; /* KISS kludge */
memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
skb->protocol = htons(ETH_P_AX25);
skb->mac.raw = skb->data;
netif_rx(skb);
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;
}
memcpy(s->hdlctx.buffer, skb->data+1, 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++;
}
/* ---------------------------------------------------------------------- */
static unsigned short random_seed;
static inline unsigned short random_num(void)
{
random_seed = 28629 * random_seed + 157;
return random_seed;
}
/* ---------------------------------------------------------------------- */
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 ((random_num() % 256) > s->ch_params.ppersist)
return;
start_tx(dev, s);
}
/* --------------------------------------------------------------------- */
/*
* ===================== network driver interface =========================
*/
static inline int hdlcdrv_paranoia_check(struct net_device *dev,
const char *routine)
{
if (!dev || !dev->priv ||
((struct hdlcdrv_state *)dev->priv)->magic != HDLCDRV_MAGIC) {
printk(KERN_ERR "hdlcdrv: bad magic number for hdlcdrv_state "
"struct in routine %s\n", routine);
return 1;
}
return 0;
}
/* --------------------------------------------------------------------- */
static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
{
struct hdlcdrv_state *sm;
if (hdlcdrv_paranoia_check(dev, "hdlcdrv_send_packet"))
return 0;
sm = (struct hdlcdrv_state *)dev->priv;
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;
if (hdlcdrv_paranoia_check(dev, "hdlcdrv_get_stats"))
return NULL;
sm = (struct hdlcdrv_state *)dev->priv;
/*
* 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;
int i;
if (hdlcdrv_paranoia_check(dev, "hdlcdrv_open"))
return -EINVAL;
s = (struct hdlcdrv_state *)dev->priv;
if (!s->ops || !s->ops->open)
return -ENODEV;
/*
* initialise some variables
*/
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;
int i = 0;
if (hdlcdrv_paranoia_check(dev, "hdlcdrv_close"))
return -EINVAL;
s = (struct hdlcdrv_state *)dev->priv;
if (s->ops && s->ops->close)
i = s->ops->close(dev);
if (s->skb)
dev_kfree_skb(s->skb);
s->skb = NULL;
return i;
}
/* --------------------------------------------------------------------- */
static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct hdlcdrv_state *s;
struct hdlcdrv_ioctl bi;
if (hdlcdrv_paranoia_check(dev, "hdlcdrv_ioctl"))
return -EINVAL;
s = (struct hdlcdrv_state *)dev->priv;
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;
}
/* --------------------------------------------------------------------- */
/*
* Check for a network adaptor of this type, and return '0' if one exists.
* If dev->base_addr == 0, probe all likely locations.
* If dev->base_addr == 1, always return failure.
* If dev->base_addr == 2, allocate space for the device and return success
* (detachable devices only).
*/
static int hdlcdrv_probe(struct net_device *dev)
{
const struct hdlcdrv_channel_params dflt_ch_params = {
20, 2, 10, 40, 0
};
struct hdlcdrv_state *s;
if (!dev)
return -ENXIO;
/*
* not a real probe! only initialize data structures
*/
s = (struct hdlcdrv_state *)dev->priv;
/*
* 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;
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
dev->hard_header = ax25_encapsulate;
dev->rebuild_header = ax25_rebuild_header;
#else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
dev->hard_header = NULL;
dev->rebuild_header = NULL;
#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
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_nocall, AX25_ADDR_LEN);
dev->tx_queue_len = 16;
/* New style flags */
dev->flags = 0;
return 0;
}
/* --------------------------------------------------------------------- */
int hdlcdrv_register_hdlcdrv(struct net_device *dev, const struct hdlcdrv_ops *ops,
unsigned int privsize, char *ifname,
unsigned int baseaddr, unsigned int irq,
unsigned int dma)
{
struct hdlcdrv_state *s;
if (!dev || !ops)
return -EACCES;
if (privsize < sizeof(struct hdlcdrv_state))
privsize = sizeof(struct hdlcdrv_state);
memset(dev, 0, sizeof(struct net_device));
if (!(s = dev->priv = kmalloc(privsize, GFP_KERNEL)))
return -ENOMEM;
/*
* initialize part of the hdlcdrv_state struct
*/
memset(s, 0, privsize);
s->magic = HDLCDRV_MAGIC;
strncpy(dev->name, ifname, sizeof(dev->name));
s->ops = ops;
/*
* initialize part of the device struct
*/
dev->if_port = 0;
dev->init = hdlcdrv_probe;
dev->base_addr = baseaddr;
dev->irq = irq;
dev->dma = dma;
if (register_netdev(dev)) {
printk(KERN_WARNING "hdlcdrv: cannot register net "
"device %s\n", dev->name);
kfree(dev->priv);
return -ENXIO;
}
MOD_INC_USE_COUNT;
return 0;
}
/* --------------------------------------------------------------------- */
int hdlcdrv_unregister_hdlcdrv(struct net_device *dev)
{
struct hdlcdrv_state *s;
if (!dev)
return -EINVAL;
if (!(s = (struct hdlcdrv_state *)dev->priv))
return -EINVAL;
if (s->magic != HDLCDRV_MAGIC)
return -EINVAL;
if (s->ops->close)
s->ops->close(dev);
unregister_netdev(dev);
kfree(s);
MOD_DEC_USE_COUNT;
return 0;
}
/* --------------------------------------------------------------------- */
EXPORT_SYMBOL(hdlcdrv_receiver);
EXPORT_SYMBOL(hdlcdrv_transmitter);
EXPORT_SYMBOL(hdlcdrv_arbitrate);
EXPORT_SYMBOL(hdlcdrv_register_hdlcdrv);
EXPORT_SYMBOL(hdlcdrv_unregister_hdlcdrv);
/* --------------------------------------------------------------------- */
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);
/* --------------------------------------------------------------------- */
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