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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 | unsigned 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 | int ptt_keyed; |
245 | |
246 | /* queued skb for transmission */ |
247 | struct sk_buff *skb; |
248 | }; |
249 | |
250 | |
251 | /* -------------------------------------------------------------------- */ |
252 | |
253 | static inline int hdlcdrv_hbuf_full(struct hdlcdrv_hdlcbuffer *hb) |
254 | { |
255 | unsigned long flags; |
256 | int ret; |
257 | |
258 | spin_lock_irqsave(&hb->lock, flags); |
259 | ret = !((HDLCDRV_HDLCBUFFER - 1 + hb->rd - hb->wr) % HDLCDRV_HDLCBUFFER); |
260 | spin_unlock_irqrestore(&hb->lock, flags); |
261 | return ret; |
262 | } |
263 | |
264 | /* -------------------------------------------------------------------- */ |
265 | |
266 | static inline int hdlcdrv_hbuf_empty(struct hdlcdrv_hdlcbuffer *hb) |
267 | { |
268 | unsigned long flags; |
269 | int ret; |
270 | |
271 | spin_lock_irqsave(&hb->lock, flags); |
272 | ret = (hb->rd == hb->wr); |
273 | spin_unlock_irqrestore(&hb->lock, flags); |
274 | return ret; |
275 | } |
276 | |
277 | /* -------------------------------------------------------------------- */ |
278 | |
279 | static inline unsigned short hdlcdrv_hbuf_get(struct hdlcdrv_hdlcbuffer *hb) |
280 | { |
281 | unsigned long flags; |
282 | unsigned short val; |
283 | unsigned newr; |
284 | |
285 | spin_lock_irqsave(&hb->lock, flags); |
286 | if (hb->rd == hb->wr) |
287 | val = 0; |
288 | else { |
289 | newr = (hb->rd+1) % HDLCDRV_HDLCBUFFER; |
290 | val = hb->buf[hb->rd]; |
291 | hb->rd = newr; |
292 | } |
293 | spin_unlock_irqrestore(&hb->lock, flags); |
294 | return val; |
295 | } |
296 | |
297 | /* -------------------------------------------------------------------- */ |
298 | |
299 | static inline void hdlcdrv_hbuf_put(struct hdlcdrv_hdlcbuffer *hb, |
300 | unsigned short val) |
301 | { |
302 | unsigned newp; |
303 | unsigned long flags; |
304 | |
305 | spin_lock_irqsave(&hb->lock, flags); |
306 | newp = (hb->wr+1) % HDLCDRV_HDLCBUFFER; |
307 | if (newp != hb->rd) { |
308 | hb->buf[hb->wr] = val & 0xffff; |
309 | hb->wr = newp; |
310 | } |
311 | spin_unlock_irqrestore(&hb->lock, flags); |
312 | } |
313 | |
314 | /* -------------------------------------------------------------------- */ |
315 | |
316 | static inline void hdlcdrv_putbits(struct hdlcdrv_state *s, unsigned int bits) |
317 | { |
318 | hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, bits); |
319 | } |
320 | |
321 | static inline unsigned int hdlcdrv_getbits(struct hdlcdrv_state *s) |
322 | { |
323 | unsigned int ret; |
324 | |
325 | if (hdlcdrv_hbuf_empty(&s->hdlctx.hbuf)) { |
326 | if (s->hdlctx.calibrate > 0) |
327 | s->hdlctx.calibrate--; |
328 | else |
329 | s->hdlctx.ptt = 0; |
330 | ret = 0; |
331 | } else |
332 | ret = hdlcdrv_hbuf_get(&s->hdlctx.hbuf); |
333 | #ifdef HDLCDRV_LOOPBACK |
334 | hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, ret); |
335 | #endif /* HDLCDRV_LOOPBACK */ |
336 | return ret; |
337 | } |
338 | |
339 | static inline void hdlcdrv_channelbit(struct hdlcdrv_state *s, unsigned int bit) |
340 | { |
341 | #ifdef HDLCDRV_DEBUG |
342 | hdlcdrv_add_bitbuffer(&s->bitbuf_channel, bit); |
343 | #endif /* HDLCDRV_DEBUG */ |
344 | } |
345 | |
346 | static inline void hdlcdrv_setdcd(struct hdlcdrv_state *s, int dcd) |
347 | { |
348 | s->hdlcrx.dcd = !!dcd; |
349 | } |
350 | |
351 | static inline int hdlcdrv_ptt(struct hdlcdrv_state *s) |
352 | { |
353 | return s->hdlctx.ptt || (s->hdlctx.calibrate > 0); |
354 | } |
355 | |
356 | /* -------------------------------------------------------------------- */ |
357 | |
358 | void hdlcdrv_receiver(struct net_device *, struct hdlcdrv_state *); |
359 | void hdlcdrv_transmitter(struct net_device *, struct hdlcdrv_state *); |
360 | void hdlcdrv_arbitrate(struct net_device *, struct hdlcdrv_state *); |
361 | struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, |
362 | unsigned int privsize, const char *ifname, |
363 | unsigned int baseaddr, unsigned int irq, |
364 | unsigned int dma); |
365 | void hdlcdrv_unregister(struct net_device *dev); |
366 | |
367 | /* -------------------------------------------------------------------- */ |
368 | |
369 | |
370 | |
371 | #endif /* __KERNEL__ */ |
372 | |
373 | /* -------------------------------------------------------------------- */ |
374 | |
375 | #endif /* _HDLCDRV_H */ |
376 | |
377 | /* -------------------------------------------------------------------- */ |
378 |
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