| /*****************************************************************************/ |
| |
| /* |
| * 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 <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++ = 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; |
| } |
| 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 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->hard_header = ax25_hard_header; |
| dev->rebuild_header = ax25_rebuild_header; |
| 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); |
| |
| /* --------------------------------------------------------------------- */ |