1 /*****************************************************************************/ 2 3 /* 4 * baycom_ser_fdx.c -- baycom ser12 fullduplex 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 * This modem usually draws its supply current out of the otherwise unused 38 * TXD pin of the serial port. Thus a contiguous stream of 0x00-bytes 39 * is transmitted to achieve a positive supply voltage. 40 * 41 * hsk: This is a 4800 baud FSK modem, designed for TNC use. It works fine 42 * in 'baycom-mode' :-) In contrast to the TCM3105 modem, power is 43 * externally supplied. So there's no need to provide the 0x00-byte-stream 44 * when receiving or idle, which drastically reduces interrupt load. 45 * 46 * Command line options (insmod command line) 47 * 48 * mode ser# hardware DCD 49 * ser#* software DCD 50 * ser#+ hardware DCD, inverted signal at DCD pin 51 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD' 52 * iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8 53 * baud baud rate (between 300 and 4800) 54 * irq interrupt line of the port; common values are 4,3 55 * 56 * 57 * History: 58 * 0.1 26.06.1996 Adapted from baycom.c and made network driver interface 59 * 18.10.1996 Changed to new user space access routines (copy_{to,from}_user) 60 * 0.3 26.04.1997 init code/data tagged 61 * 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints) 62 * 0.5 11.11.1997 ser12/par96 split into separate files 63 * 0.6 24.01.1998 Thorsten Kranzkowski, dl8bcu and Thomas Sailer: 64 * reduced interrupt load in transmit case 65 * reworked receiver 66 * 0.7 03.08.1999 adapt to Linus' new __setup/__initcall 67 * 0.8 10.08.1999 use module_init/module_exit 68 * 0.9 12.02.2000 adapted to softnet driver interface 69 * 0.10 03.07.2000 fix interface name handling 70 */ 71 72 /*****************************************************************************/ 73 74 #include <linux/capability.h> 75 #include <linux/module.h> 76 #include <linux/ioport.h> 77 #include <linux/string.h> 78 #include <linux/init.h> 79 #include <linux/interrupt.h> 80 #include <linux/hdlcdrv.h> 81 #include <linux/baycom.h> 82 #include <linux/jiffies.h> 83 84 #include <asm/uaccess.h> 85 #include <asm/io.h> 86 #include <asm/irq.h> 87 88 /* --------------------------------------------------------------------- */ 89 90 #define BAYCOM_DEBUG 91 92 /* --------------------------------------------------------------------- */ 93 94 static const char bc_drvname[] = "baycom_ser_fdx"; 95 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n" 96 "baycom_ser_fdx: version 0.10\n"; 97 98 /* --------------------------------------------------------------------- */ 99 100 #define NR_PORTS 4 101 102 static struct net_device *baycom_device[NR_PORTS]; 103 104 /* --------------------------------------------------------------------- */ 105 106 #define RBR(iobase) (iobase+0) 107 #define THR(iobase) (iobase+0) 108 #define IER(iobase) (iobase+1) 109 #define IIR(iobase) (iobase+2) 110 #define FCR(iobase) (iobase+2) 111 #define LCR(iobase) (iobase+3) 112 #define MCR(iobase) (iobase+4) 113 #define LSR(iobase) (iobase+5) 114 #define MSR(iobase) (iobase+6) 115 #define SCR(iobase) (iobase+7) 116 #define DLL(iobase) (iobase+0) 117 #define DLM(iobase) (iobase+1) 118 119 #define SER12_EXTENT 8 120 121 /* ---------------------------------------------------------------------- */ 122 /* 123 * Information that need to be kept for each board. 124 */ 125 126 struct baycom_state { 127 struct hdlcdrv_state hdrv; 128 129 unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout; 130 int opt_dcd; 131 132 struct modem_state { 133 unsigned char flags; 134 unsigned char ptt; 135 unsigned int shreg; 136 struct modem_state_ser12 { 137 unsigned char tx_bit; 138 unsigned char last_rxbit; 139 int dcd_sum0, dcd_sum1, dcd_sum2; 140 int dcd_time; 141 unsigned int pll_time; 142 unsigned int txshreg; 143 } ser12; 144 } modem; 145 146 #ifdef BAYCOM_DEBUG 147 struct debug_vals { 148 unsigned long last_jiffies; 149 unsigned cur_intcnt; 150 unsigned last_intcnt; 151 int cur_pllcorr; 152 int last_pllcorr; 153 } debug_vals; 154 #endif /* BAYCOM_DEBUG */ 155 }; 156 157 /* --------------------------------------------------------------------- */ 158 159 static inline void baycom_int_freq(struct baycom_state *bc) 160 { 161 #ifdef BAYCOM_DEBUG 162 unsigned long cur_jiffies = jiffies; 163 /* 164 * measure the interrupt frequency 165 */ 166 bc->debug_vals.cur_intcnt++; 167 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { 168 bc->debug_vals.last_jiffies = cur_jiffies; 169 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; 170 bc->debug_vals.cur_intcnt = 0; 171 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr; 172 bc->debug_vals.cur_pllcorr = 0; 173 } 174 #endif /* BAYCOM_DEBUG */ 175 } 176 177 /* --------------------------------------------------------------------- */ 178 /* 179 * ===================== SER12 specific routines ========================= 180 */ 181 182 /* --------------------------------------------------------------------- */ 183 184 static inline void ser12_set_divisor(struct net_device *dev, 185 unsigned int divisor) 186 { 187 outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */ 188 outb(divisor, DLL(dev->base_addr)); 189 outb(divisor >> 8, DLM(dev->base_addr)); 190 outb(0x01, LCR(dev->base_addr)); /* word length = 6 */ 191 /* 192 * make sure the next interrupt is generated; 193 * 0 must be used to power the modem; the modem draws its 194 * power from the TxD line 195 */ 196 outb(0x00, THR(dev->base_addr)); 197 /* 198 * it is important not to set the divider while transmitting; 199 * this reportedly makes some UARTs generating interrupts 200 * in the hundredthousands per second region 201 * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno) 202 */ 203 } 204 205 /* --------------------------------------------------------------------- */ 206 207 #if 0 208 static inline unsigned int hweight16(unsigned int w) 209 __attribute__ ((unused)); 210 static inline unsigned int hweight8(unsigned int w) 211 __attribute__ ((unused)); 212 213 static inline unsigned int hweight16(unsigned int w) 214 { 215 unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555); 216 res = (res & 0x3333) + ((res >> 2) & 0x3333); 217 res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F); 218 return (res & 0x00FF) + ((res >> 8) & 0x00FF); 219 } 220 221 static inline unsigned int hweight8(unsigned int w) 222 { 223 unsigned short res = (w & 0x55) + ((w >> 1) & 0x55); 224 res = (res & 0x33) + ((res >> 2) & 0x33); 225 return (res & 0x0F) + ((res >> 4) & 0x0F); 226 } 227 #endif 228 229 /* --------------------------------------------------------------------- */ 230 231 static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timeval *tv, unsigned char curs) 232 { 233 int timediff; 234 int bdus8 = bc->baud_us >> 3; 235 int bdus4 = bc->baud_us >> 2; 236 int bdus2 = bc->baud_us >> 1; 237 238 timediff = 1000000 + tv->tv_usec - bc->modem.ser12.pll_time; 239 while (timediff >= 500000) 240 timediff -= 1000000; 241 while (timediff >= bdus2) { 242 timediff -= bc->baud_us; 243 bc->modem.ser12.pll_time += bc->baud_us; 244 bc->modem.ser12.dcd_time--; 245 /* first check if there is room to add a bit */ 246 if (bc->modem.shreg & 1) { 247 hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff); 248 bc->modem.shreg = 0x10000; 249 } 250 /* add a one bit */ 251 bc->modem.shreg >>= 1; 252 } 253 if (bc->modem.ser12.dcd_time <= 0) { 254 if (!bc->opt_dcd) 255 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + 256 bc->modem.ser12.dcd_sum1 + 257 bc->modem.ser12.dcd_sum2) < 0); 258 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1; 259 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0; 260 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */ 261 bc->modem.ser12.dcd_time += 120; 262 } 263 if (bc->modem.ser12.last_rxbit != curs) { 264 bc->modem.ser12.last_rxbit = curs; 265 bc->modem.shreg |= 0x10000; 266 /* adjust the PLL */ 267 if (timediff > 0) 268 bc->modem.ser12.pll_time += bdus8; 269 else 270 bc->modem.ser12.pll_time += 1000000 - bdus8; 271 /* update DCD */ 272 if (abs(timediff) > bdus4) 273 bc->modem.ser12.dcd_sum0 += 4; 274 else 275 bc->modem.ser12.dcd_sum0--; 276 #ifdef BAYCOM_DEBUG 277 bc->debug_vals.cur_pllcorr = timediff; 278 #endif /* BAYCOM_DEBUG */ 279 } 280 while (bc->modem.ser12.pll_time >= 1000000) 281 bc->modem.ser12.pll_time -= 1000000; 282 } 283 284 /* --------------------------------------------------------------------- */ 285 286 static irqreturn_t ser12_interrupt(int irq, void *dev_id) 287 { 288 struct net_device *dev = (struct net_device *)dev_id; 289 struct baycom_state *bc = netdev_priv(dev); 290 struct timeval tv; 291 unsigned char iir, msr; 292 unsigned int txcount = 0; 293 294 if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC) 295 return IRQ_NONE; 296 /* fast way out for shared irq */ 297 if ((iir = inb(IIR(dev->base_addr))) & 1) 298 return IRQ_NONE; 299 /* get current time */ 300 do_gettimeofday(&tv); 301 msr = inb(MSR(dev->base_addr)); 302 /* delta DCD */ 303 if ((msr & 8) && bc->opt_dcd) 304 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80)); 305 do { 306 switch (iir & 6) { 307 case 6: 308 inb(LSR(dev->base_addr)); 309 break; 310 311 case 4: 312 inb(RBR(dev->base_addr)); 313 break; 314 315 case 2: 316 /* 317 * make sure the next interrupt is generated; 318 * 0 must be used to power the modem; the modem draws its 319 * power from the TxD line 320 */ 321 outb(0x00, THR(dev->base_addr)); 322 baycom_int_freq(bc); 323 txcount++; 324 /* 325 * first output the last bit (!) then call HDLC transmitter, 326 * since this may take quite long 327 */ 328 if (bc->modem.ptt) 329 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr)); 330 else 331 outb(0x0d, MCR(dev->base_addr)); /* transmitter off */ 332 break; 333 334 default: 335 msr = inb(MSR(dev->base_addr)); 336 /* delta DCD */ 337 if ((msr & 8) && bc->opt_dcd) 338 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80)); 339 break; 340 } 341 iir = inb(IIR(dev->base_addr)); 342 } while (!(iir & 1)); 343 ser12_rx(dev, bc, &tv, msr & 0x10); /* CTS */ 344 if (bc->modem.ptt && txcount) { 345 if (bc->modem.ser12.txshreg <= 1) { 346 bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv); 347 if (!hdlcdrv_ptt(&bc->hdrv)) { 348 ser12_set_divisor(dev, 115200/100/8); 349 bc->modem.ptt = 0; 350 goto end_transmit; 351 } 352 } 353 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1)); 354 bc->modem.ser12.txshreg >>= 1; 355 } 356 end_transmit: 357 local_irq_enable(); 358 if (!bc->modem.ptt && txcount) { 359 hdlcdrv_arbitrate(dev, &bc->hdrv); 360 if (hdlcdrv_ptt(&bc->hdrv)) { 361 ser12_set_divisor(dev, bc->baud_uartdiv); 362 bc->modem.ser12.txshreg = 1; 363 bc->modem.ptt = 1; 364 } 365 } 366 hdlcdrv_transmitter(dev, &bc->hdrv); 367 hdlcdrv_receiver(dev, &bc->hdrv); 368 local_irq_disable(); 369 return IRQ_HANDLED; 370 } 371 372 /* --------------------------------------------------------------------- */ 373 374 enum uart { c_uart_unknown, c_uart_8250, 375 c_uart_16450, c_uart_16550, c_uart_16550A}; 376 static const char *uart_str[] = { 377 "unknown", "8250", "16450", "16550", "16550A" 378 }; 379 380 static enum uart ser12_check_uart(unsigned int iobase) 381 { 382 unsigned char b1,b2,b3; 383 enum uart u; 384 enum uart uart_tab[] = 385 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A }; 386 387 b1 = inb(MCR(iobase)); 388 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */ 389 b2 = inb(MSR(iobase)); 390 outb(0x1a, MCR(iobase)); 391 b3 = inb(MSR(iobase)) & 0xf0; 392 outb(b1, MCR(iobase)); /* restore old values */ 393 outb(b2, MSR(iobase)); 394 if (b3 != 0x90) 395 return c_uart_unknown; 396 inb(RBR(iobase)); 397 inb(RBR(iobase)); 398 outb(0x01, FCR(iobase)); /* enable FIFOs */ 399 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3]; 400 if (u == c_uart_16450) { 401 outb(0x5a, SCR(iobase)); 402 b1 = inb(SCR(iobase)); 403 outb(0xa5, SCR(iobase)); 404 b2 = inb(SCR(iobase)); 405 if ((b1 != 0x5a) || (b2 != 0xa5)) 406 u = c_uart_8250; 407 } 408 return u; 409 } 410 411 /* --------------------------------------------------------------------- */ 412 413 static int ser12_open(struct net_device *dev) 414 { 415 struct baycom_state *bc = netdev_priv(dev); 416 enum uart u; 417 418 if (!dev || !bc) 419 return -ENXIO; 420 if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT || 421 dev->irq < 2 || dev->irq > nr_irqs) { 422 printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) " 423 "or irq (2 <= irq <= %d)\n", 424 0xffff-SER12_EXTENT, nr_irqs); 425 return -ENXIO; 426 } 427 if (bc->baud < 300 || bc->baud > 4800) { 428 printk(KERN_INFO "baycom_ser_fdx: invalid baudrate " 429 "(300...4800)\n"); 430 return -EINVAL; 431 } 432 if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) { 433 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy\n", 434 dev->base_addr); 435 return -EACCES; 436 } 437 memset(&bc->modem, 0, sizeof(bc->modem)); 438 bc->hdrv.par.bitrate = bc->baud; 439 bc->baud_us = 1000000/bc->baud; 440 bc->baud_uartdiv = (115200/8)/bc->baud; 441 if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){ 442 release_region(dev->base_addr, SER12_EXTENT); 443 return -EIO; 444 } 445 outb(0, FCR(dev->base_addr)); /* disable FIFOs */ 446 outb(0x0d, MCR(dev->base_addr)); 447 outb(0, IER(dev->base_addr)); 448 if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED, 449 "baycom_ser_fdx", dev)) { 450 release_region(dev->base_addr, SER12_EXTENT); 451 return -EBUSY; 452 } 453 /* 454 * set the SIO to 6 Bits/character; during receive, 455 * the baud rate is set to produce 100 ints/sec 456 * to feed the channel arbitration process, 457 * during transmit to baud ints/sec to run 458 * the transmitter 459 */ 460 ser12_set_divisor(dev, 115200/100/8); 461 /* 462 * enable transmitter empty interrupt and modem status interrupt 463 */ 464 outb(0x0a, IER(dev->base_addr)); 465 /* 466 * make sure the next interrupt is generated; 467 * 0 must be used to power the modem; the modem draws its 468 * power from the TxD line 469 */ 470 outb(0x00, THR(dev->base_addr)); 471 hdlcdrv_setdcd(&bc->hdrv, 0); 472 printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n", 473 bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]); 474 return 0; 475 } 476 477 /* --------------------------------------------------------------------- */ 478 479 static int ser12_close(struct net_device *dev) 480 { 481 struct baycom_state *bc = netdev_priv(dev); 482 483 if (!dev || !bc) 484 return -EINVAL; 485 /* 486 * disable interrupts 487 */ 488 outb(0, IER(dev->base_addr)); 489 outb(1, MCR(dev->base_addr)); 490 free_irq(dev->irq, dev); 491 release_region(dev->base_addr, SER12_EXTENT); 492 printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n", 493 bc_drvname, dev->base_addr, dev->irq); 494 return 0; 495 } 496 497 /* --------------------------------------------------------------------- */ 498 /* 499 * ===================== hdlcdrv driver interface ========================= 500 */ 501 502 /* --------------------------------------------------------------------- */ 503 504 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, 505 struct hdlcdrv_ioctl *hi, int cmd); 506 507 /* --------------------------------------------------------------------- */ 508 509 static struct hdlcdrv_ops ser12_ops = { 510 .drvname = bc_drvname, 511 .drvinfo = bc_drvinfo, 512 .open = ser12_open, 513 .close = ser12_close, 514 .ioctl = baycom_ioctl, 515 }; 516 517 /* --------------------------------------------------------------------- */ 518 519 static int baycom_setmode(struct baycom_state *bc, const char *modestr) 520 { 521 unsigned int baud; 522 523 if (!strncmp(modestr, "ser", 3)) { 524 baud = simple_strtoul(modestr+3, NULL, 10); 525 if (baud >= 3 && baud <= 48) 526 bc->baud = baud*100; 527 } 528 if (strchr(modestr, '*')) 529 bc->opt_dcd = 0; 530 else if (strchr(modestr, '+')) 531 bc->opt_dcd = -1; 532 else 533 bc->opt_dcd = 1; 534 return 0; 535 } 536 537 /* --------------------------------------------------------------------- */ 538 539 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, 540 struct hdlcdrv_ioctl *hi, int cmd) 541 { 542 struct baycom_state *bc; 543 struct baycom_ioctl bi; 544 545 if (!dev) 546 return -EINVAL; 547 548 bc = netdev_priv(dev); 549 BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC); 550 551 if (cmd != SIOCDEVPRIVATE) 552 return -ENOIOCTLCMD; 553 switch (hi->cmd) { 554 default: 555 break; 556 557 case HDLCDRVCTL_GETMODE: 558 sprintf(hi->data.modename, "ser%u", bc->baud / 100); 559 if (bc->opt_dcd <= 0) 560 strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+"); 561 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) 562 return -EFAULT; 563 return 0; 564 565 case HDLCDRVCTL_SETMODE: 566 if (netif_running(dev) || !capable(CAP_NET_ADMIN)) 567 return -EACCES; 568 hi->data.modename[sizeof(hi->data.modename)-1] = '\0'; 569 return baycom_setmode(bc, hi->data.modename); 570 571 case HDLCDRVCTL_MODELIST: 572 strcpy(hi->data.modename, "ser12,ser3,ser24"); 573 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) 574 return -EFAULT; 575 return 0; 576 577 case HDLCDRVCTL_MODEMPARMASK: 578 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ; 579 580 } 581 582 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) 583 return -EFAULT; 584 switch (bi.cmd) { 585 default: 586 return -ENOIOCTLCMD; 587 588 #ifdef BAYCOM_DEBUG 589 case BAYCOMCTL_GETDEBUG: 590 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed; 591 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt; 592 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr; 593 break; 594 #endif /* BAYCOM_DEBUG */ 595 596 } 597 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) 598 return -EFAULT; 599 return 0; 600 601 } 602 603 /* --------------------------------------------------------------------- */ 604 605 /* 606 * command line settable parameters 607 */ 608 static char *mode[NR_PORTS] = { "ser12*", }; 609 static int iobase[NR_PORTS] = { 0x3f8, }; 610 static int irq[NR_PORTS] = { 4, }; 611 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 }; 612 613 module_param_array(mode, charp, NULL, 0); 614 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD"); 615 module_param_array(iobase, int, NULL, 0); 616 MODULE_PARM_DESC(iobase, "baycom io base address"); 617 module_param_array(irq, int, NULL, 0); 618 MODULE_PARM_DESC(irq, "baycom irq number"); 619 module_param_array(baud, int, NULL, 0); 620 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)"); 621 622 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); 623 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver"); 624 MODULE_LICENSE("GPL"); 625 626 /* --------------------------------------------------------------------- */ 627 628 static int __init init_baycomserfdx(void) 629 { 630 int i, found = 0; 631 char set_hw = 1; 632 633 printk(bc_drvinfo); 634 /* 635 * register net devices 636 */ 637 for (i = 0; i < NR_PORTS; i++) { 638 struct net_device *dev; 639 struct baycom_state *bc; 640 char ifname[IFNAMSIZ]; 641 642 sprintf(ifname, "bcsf%d", i); 643 644 if (!mode[i]) 645 set_hw = 0; 646 if (!set_hw) 647 iobase[i] = irq[i] = 0; 648 649 dev = hdlcdrv_register(&ser12_ops, 650 sizeof(struct baycom_state), 651 ifname, iobase[i], irq[i], 0); 652 if (IS_ERR(dev)) 653 break; 654 655 bc = netdev_priv(dev); 656 if (set_hw && baycom_setmode(bc, mode[i])) 657 set_hw = 0; 658 bc->baud = baud[i]; 659 found++; 660 baycom_device[i] = dev; 661 } 662 663 if (!found) 664 return -ENXIO; 665 return 0; 666 } 667 668 static void __exit cleanup_baycomserfdx(void) 669 { 670 int i; 671 672 for(i = 0; i < NR_PORTS; i++) { 673 struct net_device *dev = baycom_device[i]; 674 if (dev) 675 hdlcdrv_unregister(dev); 676 } 677 } 678 679 module_init(init_baycomserfdx); 680 module_exit(cleanup_baycomserfdx); 681 682 /* --------------------------------------------------------------------- */ 683 684 #ifndef MODULE 685 686 /* 687 * format: baycom_ser_fdx=io,irq,mode 688 * mode: ser# hardware DCD 689 * ser#* software DCD 690 * ser#+ hardware DCD, inverted signal at DCD pin 691 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD' 692 */ 693 694 static int __init baycom_ser_fdx_setup(char *str) 695 { 696 static unsigned nr_dev; 697 int ints[4]; 698 699 if (nr_dev >= NR_PORTS) 700 return 0; 701 str = get_options(str, 4, ints); 702 if (ints[0] < 2) 703 return 0; 704 mode[nr_dev] = str; 705 iobase[nr_dev] = ints[1]; 706 irq[nr_dev] = ints[2]; 707 if (ints[0] >= 3) 708 baud[nr_dev] = ints[3]; 709 nr_dev++; 710 return 1; 711 } 712 713 __setup("baycom_ser_fdx=", baycom_ser_fdx_setup); 714 715 #endif /* MODULE */ 716 /* --------------------------------------------------------------------- */ 717