1 /*
2 * hdlcdrv.h -- HDLC packet radio network driver.
3 * The Linux soundcard driver for 1200 baud and 9600 baud packet radio
4 * (C) 1996-1998 by Thomas Sailer, HB9JNX/AE4WA
5 */
6
7 #ifndef _HDLCDRV_H
8 #define _HDLCDRV_H
9
10 /* -------------------------------------------------------------------- */
11 /*
12 * structs for the IOCTL commands
13 */
14
15 struct hdlcdrv_params {
16 int iobase;
17 int irq;
18 int dma;
19 int dma2;
20 int seriobase;
21 int pariobase;
22 int midiiobase;
23 };
24
25 struct hdlcdrv_channel_params {
26 int tx_delay; /* the transmitter keyup delay in 10ms units */
27 int tx_tail; /* the transmitter keyoff delay in 10ms units */
28 int slottime; /* the slottime in 10ms; usually 10 = 100ms */
29 int ppersist; /* the p-persistence 0..255 */
30 int fulldup; /* some driver do not support full duplex, setting */
31 /* this just makes them send even if DCD is on */
32 };
33
34 struct hdlcdrv_old_channel_state {
35 int ptt;
36 int dcd;
37 int ptt_keyed;
38 };
39
40 struct hdlcdrv_channel_state {
41 int ptt;
42 int dcd;
43 int ptt_keyed;
44 unsigned long tx_packets;
45 unsigned long tx_errors;
46 unsigned long rx_packets;
47 unsigned long rx_errors;
48 };
49
50 struct hdlcdrv_ioctl {
51 int cmd;
52 union {
53 struct hdlcdrv_params mp;
54 struct hdlcdrv_channel_params cp;
55 struct hdlcdrv_channel_state cs;
56 struct hdlcdrv_old_channel_state ocs;
57 unsigned int calibrate;
58 unsigned char bits;
59 char modename[128];
60 char drivername[32];
61 } data;
62 };
63
64 /* -------------------------------------------------------------------- */
65
66 /*
67 * ioctl values
68 */
69 #define HDLCDRVCTL_GETMODEMPAR 0
70 #define HDLCDRVCTL_SETMODEMPAR 1
71 #define HDLCDRVCTL_MODEMPARMASK 2 /* not handled by hdlcdrv */
72 #define HDLCDRVCTL_GETCHANNELPAR 10
73 #define HDLCDRVCTL_SETCHANNELPAR 11
74 #define HDLCDRVCTL_OLDGETSTAT 20
75 #define HDLCDRVCTL_CALIBRATE 21
76 #define HDLCDRVCTL_GETSTAT 22
77
78 /*
79 * these are mainly for debugging purposes
80 */
81 #define HDLCDRVCTL_GETSAMPLES 30
82 #define HDLCDRVCTL_GETBITS 31
83
84 /*
85 * not handled by hdlcdrv, but by its depending drivers
86 */
87 #define HDLCDRVCTL_GETMODE 40
88 #define HDLCDRVCTL_SETMODE 41
89 #define HDLCDRVCTL_MODELIST 42
90 #define HDLCDRVCTL_DRIVERNAME 43
91
92 /*
93 * mask of needed modem parameters, returned by HDLCDRVCTL_MODEMPARMASK
94 */
95 #define HDLCDRV_PARMASK_IOBASE (1<<0)
96 #define HDLCDRV_PARMASK_IRQ (1<<1)
97 #define HDLCDRV_PARMASK_DMA (1<<2)
98 #define HDLCDRV_PARMASK_DMA2 (1<<3)
99 #define HDLCDRV_PARMASK_SERIOBASE (1<<4)
100 #define HDLCDRV_PARMASK_PARIOBASE (1<<5)
101 #define HDLCDRV_PARMASK_MIDIIOBASE (1<<6)
102
103 /* -------------------------------------------------------------------- */
104
105 #ifdef __KERNEL__
106
107 #include <linux/netdevice.h>
108 #include <linux/if.h>
109 #include <linux/spinlock.h>
110
111 #define HDLCDRV_MAGIC 0x5ac6e778
112 #define HDLCDRV_HDLCBUFFER 32 /* should be a power of 2 for speed reasons */
113 #define HDLCDRV_BITBUFFER 256 /* should be a power of 2 for speed reasons */
114 #undef HDLCDRV_LOOPBACK /* define for HDLC debugging purposes */
115 #define HDLCDRV_DEBUG
116
117 /* maximum packet length, excluding CRC */
118 #define HDLCDRV_MAXFLEN 400
119
120
121 struct hdlcdrv_hdlcbuffer {
122 spinlock_t lock;
123 unsigned rd, wr;
124 unsigned short buf[HDLCDRV_HDLCBUFFER];
125 };
126
127 #ifdef HDLCDRV_DEBUG
128 struct hdlcdrv_bitbuffer {
129 unsigned int rd;
130 unsigned int wr;
131 unsigned int shreg;
132 unsigned char buffer[HDLCDRV_BITBUFFER];
133 };
134
135 static inline void hdlcdrv_add_bitbuffer(struct hdlcdrv_bitbuffer *buf,
136 unsigned int bit)
137 {
138 unsigned char new;
139
140 new = buf->shreg & 1;
141 buf->shreg >>= 1;
142 buf->shreg |= (!!bit) << 7;
143 if (new) {
144 buf->buffer[buf->wr] = buf->shreg;
145 buf->wr = (buf->wr+1) % sizeof(buf->buffer);
146 buf->shreg = 0x80;
147 }
148 }
149
150 static inline void hdlcdrv_add_bitbuffer_word(struct hdlcdrv_bitbuffer *buf,
151 unsigned int bits)
152 {
153 buf->buffer[buf->wr] = bits & 0xff;
154 buf->wr = (buf->wr+1) % sizeof(buf->buffer);
155 buf->buffer[buf->wr] = (bits >> 8) & 0xff;
156 buf->wr = (buf->wr+1) % sizeof(buf->buffer);
157
158 }
159 #endif /* HDLCDRV_DEBUG */
160
161 /* -------------------------------------------------------------------- */
162 /*
163 * Information that need to be kept for each driver.
164 */
165
166 struct hdlcdrv_ops {
167 /*
168 * first some informations needed by the hdlcdrv routines
169 */
170 const char *drvname;
171 const char *drvinfo;
172 /*
173 * the routines called by the hdlcdrv routines
174 */
175 int (*open)(struct net_device *);
176 int (*close)(struct net_device *);
177 int (*ioctl)(struct net_device *, struct ifreq *,
178 struct hdlcdrv_ioctl *, int);
179 };
180
181 struct hdlcdrv_state {
182 int magic;
183 int opened;
184
185 const struct hdlcdrv_ops *ops;
186
187 struct {
188 int bitrate;
189 } par;
190
191 struct hdlcdrv_pttoutput {
192 int dma2;
193 int seriobase;
194 int pariobase;
195 int midiiobase;
196 unsigned int flags;
197 } ptt_out;
198
199 struct hdlcdrv_channel_params ch_params;
200
201 struct hdlcdrv_hdlcrx {
202 struct hdlcdrv_hdlcbuffer hbuf;
203 unsigned long in_hdlc_rx;
204 /* 0 = sync hunt, != 0 receiving */
205 int rx_state;
206 unsigned int bitstream;
207 unsigned int bitbuf;
208 int numbits;
209 unsigned char dcd;
210
211 int len;
212 unsigned char *bp;
213 unsigned char buffer[HDLCDRV_MAXFLEN+2];
214 } hdlcrx;
215
216 struct hdlcdrv_hdlctx {
217 struct hdlcdrv_hdlcbuffer hbuf;
218 long in_hdlc_tx;
219 /*
220 * 0 = send flags
221 * 1 = send txtail (flags)
222 * 2 = send packet
223 */
224 int tx_state;
225 int numflags;
226 unsigned int bitstream;
227 unsigned char ptt;
228 int calibrate;
229 int slotcnt;
230
231 unsigned int bitbuf;
232 int numbits;
233
234 int len;
235 unsigned char *bp;
236 unsigned char buffer[HDLCDRV_MAXFLEN+2];
237 } hdlctx;
238
239 #ifdef HDLCDRV_DEBUG
240 struct hdlcdrv_bitbuffer bitbuf_channel;
241 struct hdlcdrv_bitbuffer bitbuf_hdlc;
242 #endif /* HDLCDRV_DEBUG */
243
244 struct net_device_stats stats;
245 int ptt_keyed;
246
247 /* queued skb for transmission */
248 struct sk_buff *skb;
249 };
250
251
252 /* -------------------------------------------------------------------- */
253
254 static inline int hdlcdrv_hbuf_full(struct hdlcdrv_hdlcbuffer *hb)
255 {
256 unsigned long flags;
257 int ret;
258
259 spin_lock_irqsave(&hb->lock, flags);
260 ret = !((HDLCDRV_HDLCBUFFER - 1 + hb->rd - hb->wr) % HDLCDRV_HDLCBUFFER);
261 spin_unlock_irqrestore(&hb->lock, flags);
262 return ret;
263 }
264
265 /* -------------------------------------------------------------------- */
266
267 static inline int hdlcdrv_hbuf_empty(struct hdlcdrv_hdlcbuffer *hb)
268 {
269 unsigned long flags;
270 int ret;
271
272 spin_lock_irqsave(&hb->lock, flags);
273 ret = (hb->rd == hb->wr);
274 spin_unlock_irqrestore(&hb->lock, flags);
275 return ret;
276 }
277
278 /* -------------------------------------------------------------------- */
279
280 static inline unsigned short hdlcdrv_hbuf_get(struct hdlcdrv_hdlcbuffer *hb)
281 {
282 unsigned long flags;
283 unsigned short val;
284 unsigned newr;
285
286 spin_lock_irqsave(&hb->lock, flags);
287 if (hb->rd == hb->wr)
288 val = 0;
289 else {
290 newr = (hb->rd+1) % HDLCDRV_HDLCBUFFER;
291 val = hb->buf[hb->rd];
292 hb->rd = newr;
293 }
294 spin_unlock_irqrestore(&hb->lock, flags);
295 return val;
296 }
297
298 /* -------------------------------------------------------------------- */
299
300 static inline void hdlcdrv_hbuf_put(struct hdlcdrv_hdlcbuffer *hb,
301 unsigned short val)
302 {
303 unsigned newp;
304 unsigned long flags;
305
306 spin_lock_irqsave(&hb->lock, flags);
307 newp = (hb->wr+1) % HDLCDRV_HDLCBUFFER;
308 if (newp != hb->rd) {
309 hb->buf[hb->wr] = val & 0xffff;
310 hb->wr = newp;
311 }
312 spin_unlock_irqrestore(&hb->lock, flags);
313 }
314
315 /* -------------------------------------------------------------------- */
316
317 static inline void hdlcdrv_putbits(struct hdlcdrv_state *s, unsigned int bits)
318 {
319 hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, bits);
320 }
321
322 static inline unsigned int hdlcdrv_getbits(struct hdlcdrv_state *s)
323 {
324 unsigned int ret;
325
326 if (hdlcdrv_hbuf_empty(&s->hdlctx.hbuf)) {
327 if (s->hdlctx.calibrate > 0)
328 s->hdlctx.calibrate--;
329 else
330 s->hdlctx.ptt = 0;
331 ret = 0;
332 } else
333 ret = hdlcdrv_hbuf_get(&s->hdlctx.hbuf);
334 #ifdef HDLCDRV_LOOPBACK
335 hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, ret);
336 #endif /* HDLCDRV_LOOPBACK */
337 return ret;
338 }
339
340 static inline void hdlcdrv_channelbit(struct hdlcdrv_state *s, unsigned int bit)
341 {
342 #ifdef HDLCDRV_DEBUG
343 hdlcdrv_add_bitbuffer(&s->bitbuf_channel, bit);
344 #endif /* HDLCDRV_DEBUG */
345 }
346
347 static inline void hdlcdrv_setdcd(struct hdlcdrv_state *s, int dcd)
348 {
349 s->hdlcrx.dcd = !!dcd;
350 }
351
352 static inline int hdlcdrv_ptt(struct hdlcdrv_state *s)
353 {
354 return s->hdlctx.ptt || (s->hdlctx.calibrate > 0);
355 }
356
357 /* -------------------------------------------------------------------- */
358
359 void hdlcdrv_receiver(struct net_device *, struct hdlcdrv_state *);
360 void hdlcdrv_transmitter(struct net_device *, struct hdlcdrv_state *);
361 void hdlcdrv_arbitrate(struct net_device *, struct hdlcdrv_state *);
362 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
363 unsigned int privsize, const char *ifname,
364 unsigned int baseaddr, unsigned int irq,
365 unsigned int dma);
366 void hdlcdrv_unregister(struct net_device *dev);
367
368 /* -------------------------------------------------------------------- */
369
370
371
372 #endif /* __KERNEL__ */
373
374 /* -------------------------------------------------------------------- */
375
376 #endif /* _HDLCDRV_H */
377
378 /* -------------------------------------------------------------------- */
379
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