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1da177e4 LT |
1 | /*****************************************************************************/ |
2 | ||
3 | /* | |
4 | * baycom_ser_hdx.c -- baycom ser12 halfduplex radio modem driver. | |
5 | * | |
6 | * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | * Please note that the GPL allows you to use the driver, NOT the radio. | |
23 | * In order to use the radio, you need a license from the communications | |
24 | * authority of your country. | |
25 | * | |
26 | * | |
27 | * Supported modems | |
28 | * | |
29 | * ser12: This is a very simple 1200 baud AFSK modem. The modem consists only | |
30 | * of a modulator/demodulator chip, usually a TI TCM3105. The computer | |
31 | * is responsible for regenerating the receiver bit clock, as well as | |
32 | * for handling the HDLC protocol. The modem connects to a serial port, | |
33 | * hence the name. Since the serial port is not used as an async serial | |
34 | * port, the kernel driver for serial ports cannot be used, and this | |
35 | * driver only supports standard serial hardware (8250, 16450, 16550A) | |
36 | * | |
37 | * | |
38 | * Command line options (insmod command line) | |
39 | * | |
40 | * mode ser12 hardware DCD | |
41 | * ser12* software DCD | |
42 | * ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware | |
43 | * mutes audio input to the modem | |
44 | * ser12+ hardware DCD, inverted signal at DCD pin | |
45 | * iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8 | |
46 | * irq interrupt line of the port; common values are 4,3 | |
47 | * | |
48 | * | |
49 | * History: | |
50 | * 0.1 26.06.1996 Adapted from baycom.c and made network driver interface | |
51 | * 18.10.1996 Changed to new user space access routines (copy_{to,from}_user) | |
52 | * 0.3 26.04.1997 init code/data tagged | |
53 | * 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints) | |
54 | * 0.5 11.11.1997 ser12/par96 split into separate files | |
55 | * 0.6 14.04.1998 cleanups | |
56 | * 0.7 03.08.1999 adapt to Linus' new __setup/__initcall | |
57 | * 0.8 10.08.1999 use module_init/module_exit | |
58 | * 0.9 12.02.2000 adapted to softnet driver interface | |
59 | * 0.10 03.07.2000 fix interface name handling | |
60 | */ | |
61 | ||
62 | /*****************************************************************************/ | |
63 | ||
d43c36dc | 64 | #include <linux/capability.h> |
1da177e4 LT |
65 | #include <linux/module.h> |
66 | #include <linux/ioport.h> | |
67 | #include <linux/string.h> | |
68 | #include <linux/init.h> | |
a6b7a407 | 69 | #include <linux/interrupt.h> |
7c0f6ba6 | 70 | #include <linux/uaccess.h> |
1da177e4 LT |
71 | #include <asm/io.h> |
72 | #include <linux/hdlcdrv.h> | |
73 | #include <linux/baycom.h> | |
cd8749b4 | 74 | #include <linux/jiffies.h> |
1da177e4 LT |
75 | |
76 | /* --------------------------------------------------------------------- */ | |
77 | ||
78 | #define BAYCOM_DEBUG | |
79 | ||
80 | /* --------------------------------------------------------------------- */ | |
81 | ||
82 | static const char bc_drvname[] = "baycom_ser_hdx"; | |
83 | static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n" | |
c1afba3c | 84 | "baycom_ser_hdx: version 0.10\n"; |
1da177e4 LT |
85 | |
86 | /* --------------------------------------------------------------------- */ | |
87 | ||
88 | #define NR_PORTS 4 | |
89 | ||
90 | static struct net_device *baycom_device[NR_PORTS]; | |
91 | ||
92 | /* --------------------------------------------------------------------- */ | |
93 | ||
94 | #define RBR(iobase) (iobase+0) | |
95 | #define THR(iobase) (iobase+0) | |
96 | #define IER(iobase) (iobase+1) | |
97 | #define IIR(iobase) (iobase+2) | |
98 | #define FCR(iobase) (iobase+2) | |
99 | #define LCR(iobase) (iobase+3) | |
100 | #define MCR(iobase) (iobase+4) | |
101 | #define LSR(iobase) (iobase+5) | |
102 | #define MSR(iobase) (iobase+6) | |
103 | #define SCR(iobase) (iobase+7) | |
104 | #define DLL(iobase) (iobase+0) | |
105 | #define DLM(iobase) (iobase+1) | |
106 | ||
107 | #define SER12_EXTENT 8 | |
108 | ||
109 | /* ---------------------------------------------------------------------- */ | |
110 | /* | |
111 | * Information that need to be kept for each board. | |
112 | */ | |
113 | ||
114 | struct baycom_state { | |
115 | struct hdlcdrv_state hdrv; | |
116 | ||
117 | int opt_dcd; | |
118 | ||
119 | struct modem_state { | |
120 | short arb_divider; | |
121 | unsigned char flags; | |
122 | unsigned int shreg; | |
123 | struct modem_state_ser12 { | |
124 | unsigned char tx_bit; | |
125 | int dcd_sum0, dcd_sum1, dcd_sum2; | |
126 | unsigned char last_sample; | |
127 | unsigned char last_rxbit; | |
128 | unsigned int dcd_shreg; | |
129 | unsigned int dcd_time; | |
130 | unsigned int bit_pll; | |
131 | unsigned char interm_sample; | |
132 | } ser12; | |
133 | } modem; | |
134 | ||
135 | #ifdef BAYCOM_DEBUG | |
136 | struct debug_vals { | |
137 | unsigned long last_jiffies; | |
138 | unsigned cur_intcnt; | |
139 | unsigned last_intcnt; | |
140 | int cur_pllcorr; | |
141 | int last_pllcorr; | |
142 | } debug_vals; | |
143 | #endif /* BAYCOM_DEBUG */ | |
144 | }; | |
145 | ||
146 | /* --------------------------------------------------------------------- */ | |
147 | ||
148 | static inline void baycom_int_freq(struct baycom_state *bc) | |
149 | { | |
150 | #ifdef BAYCOM_DEBUG | |
151 | unsigned long cur_jiffies = jiffies; | |
152 | /* | |
153 | * measure the interrupt frequency | |
154 | */ | |
155 | bc->debug_vals.cur_intcnt++; | |
cd8749b4 | 156 | if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { |
1da177e4 LT |
157 | bc->debug_vals.last_jiffies = cur_jiffies; |
158 | bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; | |
159 | bc->debug_vals.cur_intcnt = 0; | |
160 | bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr; | |
161 | bc->debug_vals.cur_pllcorr = 0; | |
162 | } | |
163 | #endif /* BAYCOM_DEBUG */ | |
164 | } | |
165 | ||
166 | /* --------------------------------------------------------------------- */ | |
167 | /* | |
168 | * ===================== SER12 specific routines ========================= | |
169 | */ | |
170 | ||
171 | static inline void ser12_set_divisor(struct net_device *dev, | |
172 | unsigned char divisor) | |
173 | { | |
174 | outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */ | |
175 | outb(divisor, DLL(dev->base_addr)); | |
176 | outb(0, DLM(dev->base_addr)); | |
177 | outb(0x01, LCR(dev->base_addr)); /* word length = 6 */ | |
178 | /* | |
179 | * make sure the next interrupt is generated; | |
180 | * 0 must be used to power the modem; the modem draws its | |
181 | * power from the TxD line | |
182 | */ | |
183 | outb(0x00, THR(dev->base_addr)); | |
184 | /* | |
185 | * it is important not to set the divider while transmitting; | |
186 | * this reportedly makes some UARTs generating interrupts | |
187 | * in the hundredthousands per second region | |
188 | * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno) | |
189 | */ | |
190 | } | |
191 | ||
192 | /* --------------------------------------------------------------------- */ | |
193 | ||
194 | /* | |
195 | * must call the TX arbitrator every 10ms | |
196 | */ | |
197 | #define SER12_ARB_DIVIDER(bc) (bc->opt_dcd ? 24 : 36) | |
198 | ||
199 | #define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240) | |
200 | ||
201 | static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc) | |
202 | { | |
203 | /* one interrupt per channel bit */ | |
204 | ser12_set_divisor(dev, 12); | |
205 | /* | |
206 | * first output the last bit (!) then call HDLC transmitter, | |
207 | * since this may take quite long | |
208 | */ | |
209 | outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr)); | |
210 | if (bc->modem.shreg <= 1) | |
211 | bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv); | |
212 | bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ | |
213 | (bc->modem.shreg & 1)); | |
214 | bc->modem.shreg >>= 1; | |
215 | } | |
216 | ||
217 | /* --------------------------------------------------------------------- */ | |
218 | ||
219 | static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc) | |
220 | { | |
221 | unsigned char cur_s; | |
222 | /* | |
223 | * do demodulator | |
224 | */ | |
225 | cur_s = inb(MSR(dev->base_addr)) & 0x10; /* the CTS line */ | |
226 | hdlcdrv_channelbit(&bc->hdrv, cur_s); | |
227 | bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) | | |
228 | (cur_s != bc->modem.ser12.last_sample); | |
229 | bc->modem.ser12.last_sample = cur_s; | |
230 | if(bc->modem.ser12.dcd_shreg & 1) { | |
231 | if (!bc->opt_dcd) { | |
232 | unsigned int dcdspos, dcdsneg; | |
233 | ||
234 | dcdspos = dcdsneg = 0; | |
235 | dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1); | |
236 | if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe)) | |
237 | dcdspos += 2; | |
238 | dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1); | |
239 | dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1); | |
240 | dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1); | |
241 | ||
242 | bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg; | |
243 | } else | |
244 | bc->modem.ser12.dcd_sum0--; | |
245 | } | |
246 | if(!bc->modem.ser12.dcd_time) { | |
247 | hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + | |
248 | bc->modem.ser12.dcd_sum1 + | |
249 | bc->modem.ser12.dcd_sum2) < 0); | |
250 | bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1; | |
251 | bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0; | |
252 | /* offset to ensure DCD off on silent input */ | |
253 | bc->modem.ser12.dcd_sum0 = 2; | |
254 | bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc); | |
255 | } | |
256 | bc->modem.ser12.dcd_time--; | |
257 | if (!bc->opt_dcd) { | |
258 | /* | |
259 | * PLL code for the improved software DCD algorithm | |
260 | */ | |
261 | if (bc->modem.ser12.interm_sample) { | |
262 | /* | |
263 | * intermediate sample; set timing correction to normal | |
264 | */ | |
265 | ser12_set_divisor(dev, 4); | |
266 | } else { | |
267 | /* | |
268 | * do PLL correction and call HDLC receiver | |
269 | */ | |
270 | switch (bc->modem.ser12.dcd_shreg & 7) { | |
271 | case 1: /* transition too late */ | |
272 | ser12_set_divisor(dev, 5); | |
273 | #ifdef BAYCOM_DEBUG | |
274 | bc->debug_vals.cur_pllcorr++; | |
275 | #endif /* BAYCOM_DEBUG */ | |
276 | break; | |
277 | case 4: /* transition too early */ | |
278 | ser12_set_divisor(dev, 3); | |
279 | #ifdef BAYCOM_DEBUG | |
280 | bc->debug_vals.cur_pllcorr--; | |
281 | #endif /* BAYCOM_DEBUG */ | |
282 | break; | |
283 | default: | |
284 | ser12_set_divisor(dev, 4); | |
285 | break; | |
286 | } | |
287 | bc->modem.shreg >>= 1; | |
288 | if (bc->modem.ser12.last_sample == | |
289 | bc->modem.ser12.last_rxbit) | |
290 | bc->modem.shreg |= 0x10000; | |
291 | bc->modem.ser12.last_rxbit = | |
292 | bc->modem.ser12.last_sample; | |
293 | } | |
294 | if (++bc->modem.ser12.interm_sample >= 3) | |
295 | bc->modem.ser12.interm_sample = 0; | |
296 | /* | |
297 | * DCD stuff | |
298 | */ | |
299 | if (bc->modem.ser12.dcd_shreg & 1) { | |
300 | unsigned int dcdspos, dcdsneg; | |
301 | ||
302 | dcdspos = dcdsneg = 0; | |
303 | dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1); | |
304 | dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe)) | |
305 | << 1; | |
306 | dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1); | |
307 | dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1); | |
308 | dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1); | |
309 | ||
310 | bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg; | |
311 | } | |
312 | } else { | |
313 | /* | |
314 | * PLL algorithm for the hardware squelch DCD algorithm | |
315 | */ | |
316 | if (bc->modem.ser12.interm_sample) { | |
317 | /* | |
318 | * intermediate sample; set timing correction to normal | |
319 | */ | |
320 | ser12_set_divisor(dev, 6); | |
321 | } else { | |
322 | /* | |
323 | * do PLL correction and call HDLC receiver | |
324 | */ | |
325 | switch (bc->modem.ser12.dcd_shreg & 3) { | |
326 | case 1: /* transition too late */ | |
327 | ser12_set_divisor(dev, 7); | |
328 | #ifdef BAYCOM_DEBUG | |
329 | bc->debug_vals.cur_pllcorr++; | |
330 | #endif /* BAYCOM_DEBUG */ | |
331 | break; | |
332 | case 2: /* transition too early */ | |
333 | ser12_set_divisor(dev, 5); | |
334 | #ifdef BAYCOM_DEBUG | |
335 | bc->debug_vals.cur_pllcorr--; | |
336 | #endif /* BAYCOM_DEBUG */ | |
337 | break; | |
338 | default: | |
339 | ser12_set_divisor(dev, 6); | |
340 | break; | |
341 | } | |
342 | bc->modem.shreg >>= 1; | |
343 | if (bc->modem.ser12.last_sample == | |
344 | bc->modem.ser12.last_rxbit) | |
345 | bc->modem.shreg |= 0x10000; | |
346 | bc->modem.ser12.last_rxbit = | |
347 | bc->modem.ser12.last_sample; | |
348 | } | |
349 | bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample; | |
350 | /* | |
351 | * DCD stuff | |
352 | */ | |
353 | bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1); | |
354 | } | |
355 | outb(0x0d, MCR(dev->base_addr)); /* transmitter off */ | |
356 | if (bc->modem.shreg & 1) { | |
357 | hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1); | |
358 | bc->modem.shreg = 0x10000; | |
359 | } | |
360 | if(!bc->modem.ser12.dcd_time) { | |
361 | if (bc->opt_dcd & 1) | |
362 | hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80)); | |
363 | else | |
364 | hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + | |
365 | bc->modem.ser12.dcd_sum1 + | |
366 | bc->modem.ser12.dcd_sum2) < 0); | |
367 | bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1; | |
368 | bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0; | |
369 | /* offset to ensure DCD off on silent input */ | |
370 | bc->modem.ser12.dcd_sum0 = 2; | |
371 | bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc); | |
372 | } | |
373 | bc->modem.ser12.dcd_time--; | |
374 | } | |
375 | ||
376 | /* --------------------------------------------------------------------- */ | |
377 | ||
7d12e780 | 378 | static irqreturn_t ser12_interrupt(int irq, void *dev_id) |
1da177e4 LT |
379 | { |
380 | struct net_device *dev = (struct net_device *)dev_id; | |
381 | struct baycom_state *bc = netdev_priv(dev); | |
382 | unsigned char iir; | |
383 | ||
384 | if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC) | |
385 | return IRQ_NONE; | |
386 | /* fast way out */ | |
387 | if ((iir = inb(IIR(dev->base_addr))) & 1) | |
388 | return IRQ_NONE; | |
389 | baycom_int_freq(bc); | |
390 | do { | |
391 | switch (iir & 6) { | |
392 | case 6: | |
393 | inb(LSR(dev->base_addr)); | |
394 | break; | |
395 | ||
396 | case 4: | |
397 | inb(RBR(dev->base_addr)); | |
398 | break; | |
399 | ||
400 | case 2: | |
401 | /* | |
402 | * check if transmitter active | |
403 | */ | |
404 | if (hdlcdrv_ptt(&bc->hdrv)) | |
405 | ser12_tx(dev, bc); | |
406 | else { | |
407 | ser12_rx(dev, bc); | |
408 | bc->modem.arb_divider--; | |
409 | } | |
410 | outb(0x00, THR(dev->base_addr)); | |
411 | break; | |
412 | ||
413 | default: | |
414 | inb(MSR(dev->base_addr)); | |
415 | break; | |
416 | } | |
417 | iir = inb(IIR(dev->base_addr)); | |
418 | } while (!(iir & 1)); | |
419 | if (bc->modem.arb_divider <= 0) { | |
420 | bc->modem.arb_divider = SER12_ARB_DIVIDER(bc); | |
421 | local_irq_enable(); | |
422 | hdlcdrv_arbitrate(dev, &bc->hdrv); | |
423 | } | |
424 | local_irq_enable(); | |
425 | hdlcdrv_transmitter(dev, &bc->hdrv); | |
426 | hdlcdrv_receiver(dev, &bc->hdrv); | |
427 | local_irq_disable(); | |
428 | return IRQ_HANDLED; | |
429 | } | |
430 | ||
431 | /* --------------------------------------------------------------------- */ | |
432 | ||
433 | enum uart { c_uart_unknown, c_uart_8250, | |
434 | c_uart_16450, c_uart_16550, c_uart_16550A}; | |
435 | static const char *uart_str[] = { | |
436 | "unknown", "8250", "16450", "16550", "16550A" | |
437 | }; | |
438 | ||
439 | static enum uart ser12_check_uart(unsigned int iobase) | |
440 | { | |
441 | unsigned char b1,b2,b3; | |
442 | enum uart u; | |
443 | enum uart uart_tab[] = | |
444 | { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A }; | |
445 | ||
446 | b1 = inb(MCR(iobase)); | |
447 | outb(b1 | 0x10, MCR(iobase)); /* loopback mode */ | |
448 | b2 = inb(MSR(iobase)); | |
449 | outb(0x1a, MCR(iobase)); | |
450 | b3 = inb(MSR(iobase)) & 0xf0; | |
451 | outb(b1, MCR(iobase)); /* restore old values */ | |
452 | outb(b2, MSR(iobase)); | |
453 | if (b3 != 0x90) | |
454 | return c_uart_unknown; | |
455 | inb(RBR(iobase)); | |
456 | inb(RBR(iobase)); | |
457 | outb(0x01, FCR(iobase)); /* enable FIFOs */ | |
458 | u = uart_tab[(inb(IIR(iobase)) >> 6) & 3]; | |
459 | if (u == c_uart_16450) { | |
460 | outb(0x5a, SCR(iobase)); | |
461 | b1 = inb(SCR(iobase)); | |
462 | outb(0xa5, SCR(iobase)); | |
463 | b2 = inb(SCR(iobase)); | |
464 | if ((b1 != 0x5a) || (b2 != 0xa5)) | |
465 | u = c_uart_8250; | |
466 | } | |
467 | return u; | |
468 | } | |
469 | ||
470 | /* --------------------------------------------------------------------- */ | |
471 | ||
472 | static int ser12_open(struct net_device *dev) | |
473 | { | |
474 | struct baycom_state *bc = netdev_priv(dev); | |
475 | enum uart u; | |
476 | ||
477 | if (!dev || !bc) | |
478 | return -ENXIO; | |
479 | if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT || | |
480 | dev->irq < 2 || dev->irq > 15) | |
481 | return -ENXIO; | |
482 | if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12")) | |
483 | return -EACCES; | |
484 | memset(&bc->modem, 0, sizeof(bc->modem)); | |
485 | bc->hdrv.par.bitrate = 1200; | |
486 | if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) { | |
487 | release_region(dev->base_addr, SER12_EXTENT); | |
488 | return -EIO; | |
489 | } | |
490 | outb(0, FCR(dev->base_addr)); /* disable FIFOs */ | |
491 | outb(0x0d, MCR(dev->base_addr)); | |
492 | outb(0, IER(dev->base_addr)); | |
44a504c7 | 493 | if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED, |
1da177e4 LT |
494 | "baycom_ser12", dev)) { |
495 | release_region(dev->base_addr, SER12_EXTENT); | |
496 | return -EBUSY; | |
497 | } | |
498 | /* | |
499 | * enable transmitter empty interrupt | |
500 | */ | |
501 | outb(2, IER(dev->base_addr)); | |
502 | /* | |
503 | * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that | |
504 | * we get exactly (hopefully) 2 or 3 interrupts per radio symbol, | |
505 | * depending on the usage of the software DCD routine | |
506 | */ | |
507 | ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4); | |
508 | printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n", | |
509 | bc_drvname, dev->base_addr, dev->irq, uart_str[u]); | |
510 | return 0; | |
511 | } | |
512 | ||
513 | /* --------------------------------------------------------------------- */ | |
514 | ||
515 | static int ser12_close(struct net_device *dev) | |
516 | { | |
517 | struct baycom_state *bc = netdev_priv(dev); | |
518 | ||
519 | if (!dev || !bc) | |
520 | return -EINVAL; | |
521 | /* | |
522 | * disable interrupts | |
523 | */ | |
524 | outb(0, IER(dev->base_addr)); | |
525 | outb(1, MCR(dev->base_addr)); | |
526 | free_irq(dev->irq, dev); | |
527 | release_region(dev->base_addr, SER12_EXTENT); | |
528 | printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n", | |
529 | bc_drvname, dev->base_addr, dev->irq); | |
530 | return 0; | |
531 | } | |
532 | ||
533 | /* --------------------------------------------------------------------- */ | |
534 | /* | |
535 | * ===================== hdlcdrv driver interface ========================= | |
536 | */ | |
537 | ||
538 | /* --------------------------------------------------------------------- */ | |
539 | ||
540 | static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, | |
541 | struct hdlcdrv_ioctl *hi, int cmd); | |
542 | ||
543 | /* --------------------------------------------------------------------- */ | |
544 | ||
545 | static struct hdlcdrv_ops ser12_ops = { | |
546 | .drvname = bc_drvname, | |
547 | .drvinfo = bc_drvinfo, | |
548 | .open = ser12_open, | |
549 | .close = ser12_close, | |
550 | .ioctl = baycom_ioctl, | |
551 | }; | |
552 | ||
553 | /* --------------------------------------------------------------------- */ | |
554 | ||
555 | static int baycom_setmode(struct baycom_state *bc, const char *modestr) | |
556 | { | |
557 | if (strchr(modestr, '*')) | |
558 | bc->opt_dcd = 0; | |
559 | else if (strchr(modestr, '+')) | |
560 | bc->opt_dcd = -1; | |
561 | else if (strchr(modestr, '@')) | |
562 | bc->opt_dcd = -2; | |
563 | else | |
564 | bc->opt_dcd = 1; | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /* --------------------------------------------------------------------- */ | |
569 | ||
570 | static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, | |
571 | struct hdlcdrv_ioctl *hi, int cmd) | |
572 | { | |
573 | struct baycom_state *bc; | |
574 | struct baycom_ioctl bi; | |
575 | ||
576 | if (!dev) | |
577 | return -EINVAL; | |
578 | ||
579 | bc = netdev_priv(dev); | |
580 | BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC); | |
581 | ||
582 | if (cmd != SIOCDEVPRIVATE) | |
583 | return -ENOIOCTLCMD; | |
584 | switch (hi->cmd) { | |
585 | default: | |
586 | break; | |
587 | ||
588 | case HDLCDRVCTL_GETMODE: | |
589 | strcpy(hi->data.modename, "ser12"); | |
590 | if (bc->opt_dcd <= 0) | |
591 | strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+"); | |
592 | if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) | |
593 | return -EFAULT; | |
594 | return 0; | |
595 | ||
596 | case HDLCDRVCTL_SETMODE: | |
597 | if (netif_running(dev) || !capable(CAP_NET_ADMIN)) | |
598 | return -EACCES; | |
599 | hi->data.modename[sizeof(hi->data.modename)-1] = '\0'; | |
600 | return baycom_setmode(bc, hi->data.modename); | |
601 | ||
602 | case HDLCDRVCTL_MODELIST: | |
603 | strcpy(hi->data.modename, "ser12"); | |
604 | if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) | |
605 | return -EFAULT; | |
606 | return 0; | |
607 | ||
608 | case HDLCDRVCTL_MODEMPARMASK: | |
609 | return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ; | |
610 | ||
611 | } | |
612 | ||
613 | if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) | |
614 | return -EFAULT; | |
615 | switch (bi.cmd) { | |
616 | default: | |
617 | return -ENOIOCTLCMD; | |
618 | ||
619 | #ifdef BAYCOM_DEBUG | |
620 | case BAYCOMCTL_GETDEBUG: | |
621 | bi.data.dbg.debug1 = bc->hdrv.ptt_keyed; | |
622 | bi.data.dbg.debug2 = bc->debug_vals.last_intcnt; | |
623 | bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr; | |
624 | break; | |
625 | #endif /* BAYCOM_DEBUG */ | |
626 | ||
627 | } | |
628 | if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) | |
629 | return -EFAULT; | |
630 | return 0; | |
631 | ||
632 | } | |
633 | ||
634 | /* --------------------------------------------------------------------- */ | |
635 | ||
636 | /* | |
637 | * command line settable parameters | |
638 | */ | |
639 | static char *mode[NR_PORTS] = { "ser12*", }; | |
640 | static int iobase[NR_PORTS] = { 0x3f8, }; | |
641 | static int irq[NR_PORTS] = { 4, }; | |
642 | ||
643 | module_param_array(mode, charp, NULL, 0); | |
644 | MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD"); | |
b658e5d8 | 645 | module_param_hw_array(iobase, int, ioport, NULL, 0); |
1da177e4 | 646 | MODULE_PARM_DESC(iobase, "baycom io base address"); |
b658e5d8 | 647 | module_param_hw_array(irq, int, irq, NULL, 0); |
1da177e4 LT |
648 | MODULE_PARM_DESC(irq, "baycom irq number"); |
649 | ||
650 | MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); | |
651 | MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver"); | |
652 | MODULE_LICENSE("GPL"); | |
653 | ||
654 | /* --------------------------------------------------------------------- */ | |
655 | ||
656 | static int __init init_baycomserhdx(void) | |
657 | { | |
658 | int i, found = 0; | |
659 | char set_hw = 1; | |
660 | ||
661 | printk(bc_drvinfo); | |
662 | /* | |
663 | * register net devices | |
664 | */ | |
665 | for (i = 0; i < NR_PORTS; i++) { | |
666 | struct net_device *dev; | |
667 | struct baycom_state *bc; | |
668 | char ifname[IFNAMSIZ]; | |
669 | ||
670 | sprintf(ifname, "bcsh%d", i); | |
671 | ||
672 | if (!mode[i]) | |
673 | set_hw = 0; | |
674 | if (!set_hw) | |
675 | iobase[i] = irq[i] = 0; | |
676 | ||
677 | dev = hdlcdrv_register(&ser12_ops, | |
678 | sizeof(struct baycom_state), | |
679 | ifname, iobase[i], irq[i], 0); | |
680 | if (IS_ERR(dev)) | |
681 | break; | |
682 | ||
683 | bc = netdev_priv(dev); | |
684 | if (set_hw && baycom_setmode(bc, mode[i])) | |
685 | set_hw = 0; | |
686 | found++; | |
687 | baycom_device[i] = dev; | |
688 | } | |
689 | ||
690 | if (!found) | |
691 | return -ENXIO; | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static void __exit cleanup_baycomserhdx(void) | |
696 | { | |
697 | int i; | |
698 | ||
699 | for(i = 0; i < NR_PORTS; i++) { | |
700 | struct net_device *dev = baycom_device[i]; | |
701 | ||
702 | if (dev) | |
703 | hdlcdrv_unregister(dev); | |
704 | } | |
705 | } | |
706 | ||
707 | module_init(init_baycomserhdx); | |
708 | module_exit(cleanup_baycomserhdx); | |
709 | ||
710 | /* --------------------------------------------------------------------- */ | |
711 | ||
712 | #ifndef MODULE | |
713 | ||
714 | /* | |
715 | * format: baycom_ser_hdx=io,irq,mode | |
716 | * mode: ser12 hardware DCD | |
717 | * ser12* software DCD | |
718 | * ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware | |
719 | * mutes audio input to the modem | |
720 | * ser12+ hardware DCD, inverted signal at DCD pin | |
721 | */ | |
722 | ||
723 | static int __init baycom_ser_hdx_setup(char *str) | |
724 | { | |
725 | static unsigned nr_dev; | |
726 | int ints[3]; | |
727 | ||
728 | if (nr_dev >= NR_PORTS) | |
729 | return 0; | |
730 | str = get_options(str, 3, ints); | |
731 | if (ints[0] < 2) | |
732 | return 0; | |
733 | mode[nr_dev] = str; | |
734 | iobase[nr_dev] = ints[1]; | |
735 | irq[nr_dev] = ints[2]; | |
736 | nr_dev++; | |
737 | return 1; | |
738 | } | |
739 | ||
740 | __setup("baycom_ser_hdx=", baycom_ser_hdx_setup); | |
741 | ||
742 | #endif /* MODULE */ | |
743 | /* --------------------------------------------------------------------- */ |