drivers/staging/media/lirc/lirc_serial.c

   1 /*
   2  * lirc_serial.c
   3  *
   4  * lirc_serial - Device driver that records pulse- and pause-lengths
   5  *             (space-lengths) between DDCD event on a serial port.
   6  *
   7  * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
   8  * Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>
   9  * Copyright (C) 1998 Ben Pfaff <blp@gnu.org>
  10  * Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
  11  * Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support)
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  */
  27
  28 /*
  29  * Steve's changes to improve transmission fidelity:
  30  *   - for systems with the rdtsc instruction and the clock counter, a
  31  *     send_pule that times the pulses directly using the counter.
  32  *     This means that the LIRC_SERIAL_TRANSMITTER_LATENCY fudge is
  33  *     not needed. Measurement shows very stable waveform, even where
  34  *     PCI activity slows the access to the UART, which trips up other
  35  *     versions.
  36  *   - For other system, non-integer-microsecond pulse/space lengths,
  37  *     done using fixed point binary. So, much more accurate carrier
  38  *     frequency.
  39  *   - fine tuned transmitter latency, taking advantage of fractional
  40  *     microseconds in previous change
  41  *   - Fixed bug in the way transmitter latency was accounted for by
  42  *     tuning the pulse lengths down - the send_pulse routine ignored
  43  *     this overhead as it timed the overall pulse length - so the
  44  *     pulse frequency was right but overall pulse length was too
  45  *     long. Fixed by accounting for latency on each pulse/space
  46  *     iteration.
  47  *
  48  * Steve Davies <steve@daviesfam.org>  July 2001
  49  */
  50
  51 #include <linux/module.h>
  52 #include <linux/errno.h>
  53 #include <linux/signal.h>
  54 #include <linux/sched.h>
  55 #include <linux/fs.h>
  56 #include <linux/interrupt.h>
  57 #include <linux/ioport.h>
  58 #include <linux/kernel.h>
  59 #include <linux/serial_reg.h>
  60 #include <linux/time.h>
  61 #include <linux/string.h>
  62 #include <linux/types.h>
  63 #include <linux/wait.h>
  64 #include <linux/mm.h>
  65 #include <linux/delay.h>
  66 #include <linux/poll.h>
  67 #include <linux/platform_device.h>
  68
  69 #include <linux/io.h>
  70 #include <linux/irq.h>
  71 #include <linux/fcntl.h>
  72 #include <linux/spinlock.h>
  73
  74 #ifdef CONFIG_LIRC_SERIAL_NSLU2
  75 #include <asm/hardware.h>
  76 #endif
  77 /* From Intel IXP42X Developer's Manual (#252480-005): */
  78 /* ftp://download.intel.com/design/network/manuals/25248005.pdf */
  79 #define UART_IE_IXP42X_UUE   0x40 /* IXP42X UART Unit enable */
  80 #define UART_IE_IXP42X_RTOIE 0x10 /* IXP42X Receiver Data Timeout int.enable */
  81
  82 #include <media/lirc.h>
  83 #include <media/lirc_dev.h>
  84
  85 #define LIRC_DRIVER_NAME "lirc_serial"
  86
  87 struct lirc_serial {
  88         int signal_pin;
  89         int signal_pin_change;
  90         u8 on;
  91         u8 off;
  92         long (*send_pulse)(unsigned long length);
  93         void (*send_space)(long length);
  94         int features;
  95         spinlock_t lock;
  96 };
  97
  98 #define LIRC_HOMEBREW           0
  99 #define LIRC_IRDEO              1
 100 #define LIRC_IRDEO_REMOTE       2
 101 #define LIRC_ANIMAX             3
 102 #define LIRC_IGOR               4
 103 #define LIRC_NSLU2              5
 104
 105 /*** module parameters ***/
 106 static int type;
 107 static int io;
 108 static int irq;
 109 static bool iommap;
 110 static int ioshift;
 111 static bool softcarrier = 1;
 112 static bool share_irq;
 113 static bool debug;
 114 static int sense = -1;  /* -1 = auto, 0 = active high, 1 = active low */
 115 static bool txsense;    /* 0 = active high, 1 = active low */
 116
 117 #define dprintk(fmt, args...)                                   \
 118         do {                                                    \
 119                 if (debug)                                      \
 120                         printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
 121                                fmt, ## args);                   \
 122         } while (0)
 123
 124 /* forward declarations */
 125 static long send_pulse_irdeo(unsigned long length);
 126 static long send_pulse_homebrew(unsigned long length);
 127 static void send_space_irdeo(long length);
 128 static void send_space_homebrew(long length);
 129
 130 static struct lirc_serial hardware[] = {
 131         [LIRC_HOMEBREW] = {
 132                 .signal_pin        = UART_MSR_DCD,
 133                 .signal_pin_change = UART_MSR_DDCD,
 134                 .on  = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
 135                 .off = (UART_MCR_RTS | UART_MCR_OUT2),
 136                 .send_pulse = send_pulse_homebrew,
 137                 .send_space = send_space_homebrew,
 138 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
 139                 .features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
 140                                 LIRC_CAN_SET_SEND_CARRIER |
 141                                 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
 142 #else
 143                 .features    = LIRC_CAN_REC_MODE2
 144 #endif
 145         },
 146
 147         [LIRC_IRDEO] = {
 148                 .signal_pin        = UART_MSR_DSR,
 149                 .signal_pin_change = UART_MSR_DDSR,
 150                 .on  = UART_MCR_OUT2,
 151                 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
 152                 .send_pulse  = send_pulse_irdeo,
 153                 .send_space  = send_space_irdeo,
 154                 .features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
 155                                 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
 156         },
 157
 158         [LIRC_IRDEO_REMOTE] = {
 159                 .signal_pin        = UART_MSR_DSR,
 160                 .signal_pin_change = UART_MSR_DDSR,
 161                 .on  = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
 162                 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
 163                 .send_pulse  = send_pulse_irdeo,
 164                 .send_space  = send_space_irdeo,
 165                 .features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
 166                                 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
 167         },
 168
 169         [LIRC_ANIMAX] = {
 170                 .signal_pin        = UART_MSR_DCD,
 171                 .signal_pin_change = UART_MSR_DDCD,
 172                 .on  = 0,
 173                 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
 174                 .send_pulse = NULL,
 175                 .send_space = NULL,
 176                 .features   = LIRC_CAN_REC_MODE2
 177         },
 178
 179         [LIRC_IGOR] = {
 180                 .signal_pin        = UART_MSR_DSR,
 181                 .signal_pin_change = UART_MSR_DDSR,
 182                 .on  = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
 183                 .off = (UART_MCR_RTS | UART_MCR_OUT2),
 184                 .send_pulse = send_pulse_homebrew,
 185                 .send_space = send_space_homebrew,
 186 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
 187                 .features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
 188                                 LIRC_CAN_SET_SEND_CARRIER |
 189                                 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
 190 #else
 191                 .features    = LIRC_CAN_REC_MODE2
 192 #endif
 193         },
 194
 195 #ifdef CONFIG_LIRC_SERIAL_NSLU2
 196         /*
 197          * Modified Linksys Network Storage Link USB 2.0 (NSLU2):
 198          * We receive on CTS of the 2nd serial port (R142,LHS), we
 199          * transmit with a IR diode between GPIO[1] (green status LED),
 200          * and ground (Matthias Goebl <matthias.goebl@goebl.net>).
 201          * See also http://www.nslu2-linux.org for this device
 202          */
 203         [LIRC_NSLU2] = {
 204                 .signal_pin        = UART_MSR_CTS,
 205                 .signal_pin_change = UART_MSR_DCTS,
 206                 .on  = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
 207                 .off = (UART_MCR_RTS | UART_MCR_OUT2),
 208                 .send_pulse = send_pulse_homebrew,
 209                 .send_space = send_space_homebrew,
 210 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
 211                 .features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
 212                                 LIRC_CAN_SET_SEND_CARRIER |
 213                                 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
 214 #else
 215                 .features    = LIRC_CAN_REC_MODE2
 216 #endif
 217         },
 218 #endif
 219
 220 };
 221
 222 #define RS_ISR_PASS_LIMIT 256
 223
 224 /*
 225  * A long pulse code from a remote might take up to 300 bytes.  The
 226  * daemon should read the bytes as soon as they are generated, so take
 227  * the number of keys you think you can push before the daemon runs
 228  * and multiply by 300.  The driver will warn you if you overrun this
 229  * buffer.  If you have a slow computer or non-busmastering IDE disks,
 230  * maybe you will need to increase this.
 231  */
 232
 233 /* This MUST be a power of two!  It has to be larger than 1 as well. */
 234
 235 #define RBUF_LEN 256
 236
 237 static struct timeval lasttv = {0, 0};
 238
 239 static struct lirc_buffer rbuf;
 240
 241 static unsigned int freq = 38000;
 242 static unsigned int duty_cycle = 50;
 243
 244 /* Initialized in init_timing_params() */
 245 static unsigned long period;
 246 static unsigned long pulse_width;
 247 static unsigned long space_width;
 248
 249 #if defined(__i386__)
 250 /*
 251  * From:
 252  * Linux I/O port programming mini-HOWTO
 253  * Author: Riku Saikkonen <Riku.Saikkonen@hut.fi>
 254  * v, 28 December 1997
 255  *
 256  * [...]
 257  * Actually, a port I/O instruction on most ports in the 0-0x3ff range
 258  * takes almost exactly 1 microsecond, so if you're, for example, using
 259  * the parallel port directly, just do additional inb()s from that port
 260  * to delay.
 261  * [...]
 262  */
 263 /* transmitter latency 1.5625us 0x1.90 - this figure arrived at from
 264  * comment above plus trimming to match actual measured frequency.
 265  * This will be sensitive to cpu speed, though hopefully most of the 1.5us
 266  * is spent in the uart access.  Still - for reference test machine was a
 267  * 1.13GHz Athlon system - Steve
 268  */
 269
 270 /*
 271  * changed from 400 to 450 as this works better on slower machines;
 272  * faster machines will use the rdtsc code anyway
 273  */
 274 #define LIRC_SERIAL_TRANSMITTER_LATENCY 450
 275
 276 #else
 277
 278 /* does anybody have information on other platforms ? */
 279 /* 256 = 1<<8 */
 280 #define LIRC_SERIAL_TRANSMITTER_LATENCY 256
 281
 282 #endif  /* __i386__ */
 283 /*
 284  * FIXME: should we be using hrtimers instead of this
 285  * LIRC_SERIAL_TRANSMITTER_LATENCY nonsense?
 286  */
 287
 288 /* fetch serial input packet (1 byte) from register offset */
 289 static u8 sinp(int offset)
 290 {
 291         if (iommap != 0)
 292                 /* the register is memory-mapped */
 293                 offset <<= ioshift;
 294
 295         return inb(io + offset);
 296 }
 297
 298 /* write serial output packet (1 byte) of value to register offset */
 299 static void soutp(int offset, u8 value)
 300 {
 301         if (iommap != 0)
 302                 /* the register is memory-mapped */
 303                 offset <<= ioshift;
 304
 305         outb(value, io + offset);
 306 }
 307
 308 static void on(void)
 309 {
 310 #ifdef CONFIG_LIRC_SERIAL_NSLU2
 311         /*
 312          * On NSLU2, we put the transmit diode between the output of the green
 313          * status LED and ground
 314          */
 315         if (type == LIRC_NSLU2) {
 316                 gpio_line_set(NSLU2_LED_GRN, IXP4XX_GPIO_LOW);
 317                 return;
 318         }
 319 #endif
 320         if (txsense)
 321                 soutp(UART_MCR, hardware[type].off);
 322         else
 323                 soutp(UART_MCR, hardware[type].on);
 324 }
 325
 326 static void off(void)
 327 {
 328 #ifdef CONFIG_LIRC_SERIAL_NSLU2
 329         if (type == LIRC_NSLU2) {
 330                 gpio_line_set(NSLU2_LED_GRN, IXP4XX_GPIO_HIGH);
 331                 return;
 332         }
 333 #endif
 334         if (txsense)
 335                 soutp(UART_MCR, hardware[type].on);
 336         else
 337                 soutp(UART_MCR, hardware[type].off);
 338 }
 339
 340 #ifndef MAX_UDELAY_MS
 341 #define MAX_UDELAY_US 5000
 342 #else
 343 #define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
 344 #endif
 345
 346 static void safe_udelay(unsigned long usecs)
 347 {
 348         while (usecs > MAX_UDELAY_US) {
 349                 udelay(MAX_UDELAY_US);
 350                 usecs -= MAX_UDELAY_US;
 351         }
 352         udelay(usecs);
 353 }
 354
 355 #ifdef USE_RDTSC
 356 /*
 357  * This is an overflow/precision juggle, complicated in that we can't
 358  * do long long divide in the kernel
 359  */
 360
 361 /*
 362  * When we use the rdtsc instruction to measure clocks, we keep the
 363  * pulse and space widths as clock cycles.  As this is CPU speed
 364  * dependent, the widths must be calculated in init_port and ioctl
 365  * time
 366  */
 367
 368 /* So send_pulse can quickly convert microseconds to clocks */
 369 static unsigned long conv_us_to_clocks;
 370
 371 static int init_timing_params(unsigned int new_duty_cycle,
 372                 unsigned int new_freq)
 373 {
 374         __u64 loops_per_sec, work;
 375
 376         duty_cycle = new_duty_cycle;
 377         freq = new_freq;
 378
 379         loops_per_sec = __this_cpu_read(cpu.info.loops_per_jiffy);
 380         loops_per_sec *= HZ;
 381
 382         /* How many clocks in a microsecond?, avoiding long long divide */
 383         work = loops_per_sec;
 384         work *= 4295;  /* 4295 = 2^32 / 1e6 */
 385         conv_us_to_clocks = (work >> 32);
 386
 387         /*
 388          * Carrier period in clocks, approach good up to 32GHz clock,
 389          * gets carrier frequency within 8Hz
 390          */
 391         period = loops_per_sec >> 3;
 392         period /= (freq >> 3);
 393
 394         /* Derive pulse and space from the period */
 395         pulse_width = period * duty_cycle / 100;
 396         space_width = period - pulse_width;
 397         dprintk("in init_timing_params, freq=%d, duty_cycle=%d, "
 398                 "clk/jiffy=%ld, pulse=%ld, space=%ld, "
 399                 "conv_us_to_clocks=%ld\n",
 400                 freq, duty_cycle, __this_cpu_read(cpu_info.loops_per_jiffy),
 401                 pulse_width, space_width, conv_us_to_clocks);
 402         return 0;
 403 }
 404 #else /* ! USE_RDTSC */
 405 static int init_timing_params(unsigned int new_duty_cycle,
 406                 unsigned int new_freq)
 407 {
 408 /*
 409  * period, pulse/space width are kept with 8 binary places -
 410  * IE multiplied by 256.
 411  */
 412         if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
 413             LIRC_SERIAL_TRANSMITTER_LATENCY)
 414                 return -EINVAL;
 415         if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
 416             LIRC_SERIAL_TRANSMITTER_LATENCY)
 417                 return -EINVAL;
 418         duty_cycle = new_duty_cycle;
 419         freq = new_freq;
 420         period = 256 * 1000000L / freq;
 421         pulse_width = period * duty_cycle / 100;
 422         space_width = period - pulse_width;
 423         dprintk("in init_timing_params, freq=%d pulse=%ld, "
 424                 "space=%ld\n", freq, pulse_width, space_width);
 425         return 0;
 426 }
 427 #endif /* USE_RDTSC */
 428
 429
 430 /* return value: space length delta */
 431
 432 static long send_pulse_irdeo(unsigned long length)
 433 {
 434         long rawbits, ret;
 435         int i;
 436         unsigned char output;
 437         unsigned char chunk, shifted;
 438
 439         /* how many bits have to be sent ? */
 440         rawbits = length * 1152 / 10000;
 441         if (duty_cycle > 50)
 442                 chunk = 3;
 443         else
 444                 chunk = 1;
 445         for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {
 446                 shifted = chunk << (i * 3);
 447                 shifted >>= 1;
 448                 output &= (~shifted);
 449                 i++;
 450                 if (i == 3) {
 451                         soutp(UART_TX, output);
 452                         while (!(sinp(UART_LSR) & UART_LSR_THRE))
 453                                 ;
 454                         output = 0x7f;
 455                         i = 0;
 456                 }
 457         }
 458         if (i != 0) {
 459                 soutp(UART_TX, output);
 460                 while (!(sinp(UART_LSR) & UART_LSR_TEMT))
 461                         ;
 462         }
 463
 464         if (i == 0)
 465                 ret = (-rawbits) * 10000 / 1152;
 466         else
 467                 ret = (3 - i) * 3 * 10000 / 1152 + (-rawbits) * 10000 / 1152;
 468
 469         return ret;
 470 }
 471
 472 #ifdef USE_RDTSC
 473 /* Version that uses Pentium rdtsc instruction to measure clocks */
 474
 475 /*
 476  * This version does sub-microsecond timing using rdtsc instruction,
 477  * and does away with the fudged LIRC_SERIAL_TRANSMITTER_LATENCY
 478  * Implicitly i586 architecture...  - Steve
 479  */
 480
 481 static long send_pulse_homebrew_softcarrier(unsigned long length)
 482 {
 483         int flag;
 484         unsigned long target, start, now;
 485
 486         /* Get going quick as we can */
 487         rdtscl(start);
 488         on();
 489         /* Convert length from microseconds to clocks */
 490         length *= conv_us_to_clocks;
 491         /* And loop till time is up - flipping at right intervals */
 492         now = start;
 493         target = pulse_width;
 494         flag = 1;
 495         /*
 496          * FIXME: This looks like a hard busy wait, without even an occasional,
 497          * polite, cpu_relax() call.  There's got to be a better way?
 498          *
 499          * The i2c code has the result of a lot of bit-banging work, I wonder if
 500          * there's something there which could be helpful here.
 501          */
 502         while ((now - start) < length) {
 503                 /* Delay till flip time */
 504                 do {
 505                         rdtscl(now);
 506                 } while ((now - start) < target);
 507
 508                 /* flip */
 509                 if (flag) {
 510                         rdtscl(now);
 511                         off();
 512                         target += space_width;
 513                 } else {
 514                         rdtscl(now); on();
 515                         target += pulse_width;
 516                 }
 517                 flag = !flag;
 518         }
 519         rdtscl(now);
 520         return ((now - start) - length) / conv_us_to_clocks;
 521 }
 522 #else /* ! USE_RDTSC */
 523 /* Version using udelay() */
 524
 525 /*
 526  * here we use fixed point arithmetic, with 8
 527  * fractional bits.  that gets us within 0.1% or so of the right average
 528  * frequency, albeit with some jitter in pulse length - Steve
 529  */
 530
 531 /* To match 8 fractional bits used for pulse/space length */
 532
 533 static long send_pulse_homebrew_softcarrier(unsigned long length)
 534 {
 535         int flag;
 536         unsigned long actual, target, d;
 537         length <<= 8;
 538
 539         actual = 0; target = 0; flag = 0;
 540         while (actual < length) {
 541                 if (flag) {
 542                         off();
 543                         target += space_width;
 544                 } else {
 545                         on();
 546                         target += pulse_width;
 547                 }
 548                 d = (target - actual -
 549                      LIRC_SERIAL_TRANSMITTER_LATENCY + 128) >> 8;
 550                 /*
 551                  * Note - we've checked in ioctl that the pulse/space
 552                  * widths are big enough so that d is > 0
 553                  */
 554                 udelay(d);
 555                 actual += (d << 8) + LIRC_SERIAL_TRANSMITTER_LATENCY;
 556                 flag = !flag;
 557         }
 558         return (actual-length) >> 8;
 559 }
 560 #endif /* USE_RDTSC */
 561
 562 static long send_pulse_homebrew(unsigned long length)
 563 {
 564         if (length <= 0)
 565                 return 0;
 566
 567         if (softcarrier)
 568                 return send_pulse_homebrew_softcarrier(length);
 569         else {
 570                 on();
 571                 safe_udelay(length);
 572                 return 0;
 573         }
 574 }
 575
 576 static void send_space_irdeo(long length)
 577 {
 578         if (length <= 0)
 579                 return;
 580
 581         safe_udelay(length);
 582 }
 583
 584 static void send_space_homebrew(long length)
 585 {
 586         off();
 587         if (length <= 0)
 588                 return;
 589         safe_udelay(length);
 590 }
 591
 592 static void rbwrite(int l)
 593 {
 594         if (lirc_buffer_full(&rbuf)) {
 595                 /* no new signals will be accepted */
 596                 dprintk("Buffer overrun\n");
 597                 return;
 598         }
 599         lirc_buffer_write(&rbuf, (void *)&l);
 600 }
 601
 602 static void frbwrite(int l)
 603 {
 604         /* simple noise filter */
 605         static int pulse, space;
 606         static unsigned int ptr;
 607
 608         if (ptr > 0 && (l & PULSE_BIT)) {
 609                 pulse += l & PULSE_MASK;
 610                 if (pulse > 250) {
 611                         rbwrite(space);
 612                         rbwrite(pulse | PULSE_BIT);
 613                         ptr = 0;
 614                         pulse = 0;
 615                 }
 616                 return;
 617         }
 618         if (!(l & PULSE_BIT)) {
 619                 if (ptr == 0) {
 620                         if (l > 20000) {
 621                                 space = l;
 622                                 ptr++;
 623                                 return;
 624                         }
 625                 } else {
 626                         if (l > 20000) {
 627                                 space += pulse;
 628                                 if (space > PULSE_MASK)
 629                                         space = PULSE_MASK;
 630                                 space += l;
 631                                 if (space > PULSE_MASK)
 632                                         space = PULSE_MASK;
 633                                 pulse = 0;
 634                                 return;
 635                         }
 636                         rbwrite(space);
 637                         rbwrite(pulse | PULSE_BIT);
 638                         ptr = 0;
 639                         pulse = 0;
 640                 }
 641         }
 642         rbwrite(l);
 643 }
 644
 645 static irqreturn_t irq_handler(int i, void *blah)
 646 {
 647         struct timeval tv;
 648         int counter, dcd;
 649         u8 status;
 650         long deltv;
 651         int data;
 652         static int last_dcd = -1;
 653
 654         if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
 655                 /* not our interrupt */
 656                 return IRQ_NONE;
 657         }
 658
 659         counter = 0;
 660         do {
 661                 counter++;
 662                 status = sinp(UART_MSR);
 663                 if (counter > RS_ISR_PASS_LIMIT) {
 664                         printk(KERN_WARNING LIRC_DRIVER_NAME ": AIEEEE: "
 665                                "We're caught!\n");
 666                         break;
 667                 }
 668                 if ((status & hardware[type].signal_pin_change)
 669                     && sense != -1) {
 670                         /* get current time */
 671                         do_gettimeofday(&tv);
 672
 673                         /* New mode, written by Trent Piepho
 674                            <xyzzy@u.washington.edu>. */
 675
 676                         /*
 677                          * The old format was not very portable.
 678                          * We now use an int to pass pulses
 679                          * and spaces to user space.
 680                          *
 681                          * If PULSE_BIT is set a pulse has been
 682                          * received, otherwise a space has been
 683                          * received.  The driver needs to know if your
 684                          * receiver is active high or active low, or
 685                          * the space/pulse sense could be
 686                          * inverted. The bits denoted by PULSE_MASK are
 687                          * the length in microseconds. Lengths greater
 688                          * than or equal to 16 seconds are clamped to
 689                          * PULSE_MASK.  All other bits are unused.
 690                          * This is a much simpler interface for user
 691                          * programs, as well as eliminating "out of
 692                          * phase" errors with space/pulse
 693                          * autodetection.
 694                          */
 695
 696                         /* calc time since last interrupt in microseconds */
 697                         dcd = (status & hardware[type].signal_pin) ? 1 : 0;
 698
 699                         if (dcd == last_dcd) {
 700                                 printk(KERN_WARNING LIRC_DRIVER_NAME
 701                                 ": ignoring spike: %d %d %lx %lx %lx %lx\n",
 702                                 dcd, sense,
 703                                 tv.tv_sec, lasttv.tv_sec,
 704                                 tv.tv_usec, lasttv.tv_usec);
 705                                 continue;
 706                         }
 707
 708                         deltv = tv.tv_sec-lasttv.tv_sec;
 709                         if (tv.tv_sec < lasttv.tv_sec ||
 710                             (tv.tv_sec == lasttv.tv_sec &&
 711                              tv.tv_usec < lasttv.tv_usec)) {
 712                                 printk(KERN_WARNING LIRC_DRIVER_NAME
 713                                        ": AIEEEE: your clock just jumped "
 714                                        "backwards\n");
 715                                 printk(KERN_WARNING LIRC_DRIVER_NAME
 716                                        ": %d %d %lx %lx %lx %lx\n",
 717                                        dcd, sense,
 718                                        tv.tv_sec, lasttv.tv_sec,
 719                                        tv.tv_usec, lasttv.tv_usec);
 720                                 data = PULSE_MASK;
 721                         } else if (deltv > 15) {
 722                                 data = PULSE_MASK; /* really long time */
 723                                 if (!(dcd^sense)) {
 724                                         /* sanity check */
 725                                         printk(KERN_WARNING LIRC_DRIVER_NAME
 726                                                ": AIEEEE: "
 727                                                "%d %d %lx %lx %lx %lx\n",
 728                                                dcd, sense,
 729                                                tv.tv_sec, lasttv.tv_sec,
 730                                                tv.tv_usec, lasttv.tv_usec);
 731                                         /*
 732                                          * detecting pulse while this
 733                                          * MUST be a space!
 734                                          */
 735                                         sense = sense ? 0 : 1;
 736                                 }
 737                         } else
 738                                 data = (int) (deltv*1000000 +
 739                                                tv.tv_usec -
 740                                                lasttv.tv_usec);
 741                         frbwrite(dcd^sense ? data : (data|PULSE_BIT));
 742                         lasttv = tv;
 743                         last_dcd = dcd;
 744                         wake_up_interruptible(&rbuf.wait_poll);
 745                 }
 746         } while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
 747         return IRQ_HANDLED;
 748 }
 749
 750
 751 static int hardware_init_port(void)
 752 {
 753         u8 scratch, scratch2, scratch3;
 754
 755         /*
 756          * This is a simple port existence test, borrowed from the autoconfig
 757          * function in drivers/serial/8250.c
 758          */
 759         scratch = sinp(UART_IER);
 760         soutp(UART_IER, 0);
 761 #ifdef __i386__
 762         outb(0xff, 0x080);
 763 #endif
 764         scratch2 = sinp(UART_IER) & 0x0f;
 765         soutp(UART_IER, 0x0f);
 766 #ifdef __i386__
 767         outb(0x00, 0x080);
 768 #endif
 769         scratch3 = sinp(UART_IER) & 0x0f;
 770         soutp(UART_IER, scratch);
 771         if (scratch2 != 0 || scratch3 != 0x0f) {
 772                 /* we fail, there's nothing here */
 773                 printk(KERN_ERR LIRC_DRIVER_NAME ": port existence test "
 774                        "failed, cannot continue\n");
 775                 return -ENODEV;
 776         }
 777
 778
 779
 780         /* Set DLAB 0. */
 781         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
 782
 783         /* First of all, disable all interrupts */
 784         soutp(UART_IER, sinp(UART_IER) &
 785               (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
 786
 787         /* Clear registers. */
 788         sinp(UART_LSR);
 789         sinp(UART_RX);
 790         sinp(UART_IIR);
 791         sinp(UART_MSR);
 792
 793 #ifdef CONFIG_LIRC_SERIAL_NSLU2
 794         if (type == LIRC_NSLU2) {
 795                 /* Setup NSLU2 UART */
 796
 797                 /* Enable UART */
 798                 soutp(UART_IER, sinp(UART_IER) | UART_IE_IXP42X_UUE);
 799                 /* Disable Receiver data Time out interrupt */
 800                 soutp(UART_IER, sinp(UART_IER) & ~UART_IE_IXP42X_RTOIE);
 801                 /* set out2 = interrupt unmask; off() doesn't set MCR
 802                    on NSLU2 */
 803                 soutp(UART_MCR, UART_MCR_RTS|UART_MCR_OUT2);
 804         }
 805 #endif
 806
 807         /* Set line for power source */
 808         off();
 809
 810         /* Clear registers again to be sure. */
 811         sinp(UART_LSR);
 812         sinp(UART_RX);
 813         sinp(UART_IIR);
 814         sinp(UART_MSR);
 815
 816         switch (type) {
 817         case LIRC_IRDEO:
 818         case LIRC_IRDEO_REMOTE:
 819                 /* setup port to 7N1 @ 115200 Baud */
 820                 /* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
 821
 822                 /* Set DLAB 1. */
 823                 soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
 824                 /* Set divisor to 1 => 115200 Baud */
 825                 soutp(UART_DLM, 0);
 826                 soutp(UART_DLL, 1);
 827                 /* Set DLAB 0 +  7N1 */
 828                 soutp(UART_LCR, UART_LCR_WLEN7);
 829                 /* THR interrupt already disabled at this point */
 830                 break;
 831         default:
 832                 break;
 833         }
 834
 835         return 0;
 836 }
 837
 838 static int __devinit lirc_serial_probe(struct platform_device *dev)
 839 {
 840         int i, nlow, nhigh, result;
 841
 842         result = request_irq(irq, irq_handler,
 843                              (share_irq ? IRQF_SHARED : 0),
 844                              LIRC_DRIVER_NAME, (void *)&hardware);
 845         if (result < 0) {
 846                 if (result == -EBUSY)
 847                         printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n",
 848                                irq);
 849                 else if (result == -EINVAL)
 850                         printk(KERN_ERR LIRC_DRIVER_NAME
 851                                ": Bad irq number or handler\n");
 852                 return result;
 853         }
 854
 855         /* Reserve io region. */
 856         /*
 857          * Future MMAP-Developers: Attention!
 858          * For memory mapped I/O you *might* need to use ioremap() first,
 859          * for the NSLU2 it's done in boot code.
 860          */
 861         if (((iommap != 0)
 862              && (request_mem_region(iommap, 8 << ioshift,
 863                                     LIRC_DRIVER_NAME) == NULL))
 864            || ((iommap == 0)
 865                && (request_region(io, 8, LIRC_DRIVER_NAME) == NULL))) {
 866                 printk(KERN_ERR  LIRC_DRIVER_NAME
 867                        ": port %04x already in use\n", io);
 868                 printk(KERN_WARNING LIRC_DRIVER_NAME
 869                        ": use 'setserial /dev/ttySX uart none'\n");
 870                 printk(KERN_WARNING LIRC_DRIVER_NAME
 871                        ": or compile the serial port driver as module and\n");
 872                 printk(KERN_WARNING LIRC_DRIVER_NAME
 873                        ": make sure this module is loaded first\n");
 874                 result = -EBUSY;
 875                 goto exit_free_irq;
 876         }
 877
 878         result = hardware_init_port();
 879         if (result < 0)
 880                 goto exit_release_region;
 881
 882         /* Initialize pulse/space widths */
 883         init_timing_params(duty_cycle, freq);
 884
 885         /* If pin is high, then this must be an active low receiver. */
 886         if (sense == -1) {
 887                 /* wait 1/2 sec for the power supply */
 888                 msleep(500);
 889
 890                 /*
 891                  * probe 9 times every 0.04s, collect "votes" for
 892                  * active high/low
 893                  */
 894                 nlow = 0;
 895                 nhigh = 0;
 896                 for (i = 0; i < 9; i++) {
 897                         if (sinp(UART_MSR) & hardware[type].signal_pin)
 898                                 nlow++;
 899                         else
 900                                 nhigh++;
 901                         msleep(40);
 902                 }
 903                 sense = (nlow >= nhigh ? 1 : 0);
 904                 printk(KERN_INFO LIRC_DRIVER_NAME  ": auto-detected active "
 905                        "%s receiver\n", sense ? "low" : "high");
 906         } else
 907                 printk(KERN_INFO LIRC_DRIVER_NAME  ": Manually using active "
 908                        "%s receiver\n", sense ? "low" : "high");
 909
 910         dprintk("Interrupt %d, port %04x obtained\n", irq, io);
 911         return 0;
 912
 913 exit_release_region:
 914         if (iommap != 0)
 915                 release_mem_region(iommap, 8 << ioshift);
 916         else
 917                 release_region(io, 8);
 918 exit_free_irq:
 919         free_irq(irq, (void *)&hardware);
 920
 921         return result;
 922 }
 923
 924 static int __devexit lirc_serial_remove(struct platform_device *dev)
 925 {
 926         free_irq(irq, (void *)&hardware);
 927
 928         if (iommap != 0)
 929                 release_mem_region(iommap, 8 << ioshift);
 930         else
 931                 release_region(io, 8);
 932
 933         return 0;
 934 }
 935
 936 static int set_use_inc(void *data)
 937 {
 938         unsigned long flags;
 939
 940         /* initialize timestamp */
 941         do_gettimeofday(&lasttv);
 942
 943         spin_lock_irqsave(&hardware[type].lock, flags);
 944
 945         /* Set DLAB 0. */
 946         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
 947
 948         soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
 949
 950         spin_unlock_irqrestore(&hardware[type].lock, flags);
 951
 952         return 0;
 953 }
 954
 955 static void set_use_dec(void *data)
 956 {       unsigned long flags;
 957
 958         spin_lock_irqsave(&hardware[type].lock, flags);
 959
 960         /* Set DLAB 0. */
 961         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
 962
 963         /* First of all, disable all interrupts */
 964         soutp(UART_IER, sinp(UART_IER) &
 965               (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
 966         spin_unlock_irqrestore(&hardware[type].lock, flags);
 967 }
 968
 969 static ssize_t lirc_write(struct file *file, const char *buf,
 970                          size_t n, loff_t *ppos)
 971 {
 972         int i, count;
 973         unsigned long flags;
 974         long delta = 0;
 975         int *wbuf;
 976
 977         if (!(hardware[type].features & LIRC_CAN_SEND_PULSE))
 978                 return -EPERM;
 979
 980         count = n / sizeof(int);
 981         if (n % sizeof(int) || count % 2 == 0)
 982                 return -EINVAL;
 983         wbuf = memdup_user(buf, n);
 984         if (IS_ERR(wbuf))
 985                 return PTR_ERR(wbuf);
 986         spin_lock_irqsave(&hardware[type].lock, flags);
 987         if (type == LIRC_IRDEO) {
 988                 /* DTR, RTS down */
 989                 on();
 990         }
 991         for (i = 0; i < count; i++) {
 992                 if (i%2)
 993                         hardware[type].send_space(wbuf[i] - delta);
 994                 else
 995                         delta = hardware[type].send_pulse(wbuf[i]);
 996         }
 997         off();
 998         spin_unlock_irqrestore(&hardware[type].lock, flags);
 999         kfree(wbuf);
1000         return n;
1001 }
1002
1003 static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
1004 {
1005         int result;
1006         __u32 value;
1007
1008         switch (cmd) {
1009         case LIRC_GET_SEND_MODE:
1010                 if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
1011                         return -ENOIOCTLCMD;
1012
1013                 result = put_user(LIRC_SEND2MODE
1014                                   (hardware[type].features&LIRC_CAN_SEND_MASK),
1015                                   (__u32 *) arg);
1016                 if (result)
1017                         return result;
1018                 break;
1019
1020         case LIRC_SET_SEND_MODE:
1021                 if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
1022                         return -ENOIOCTLCMD;
1023
1024                 result = get_user(value, (__u32 *) arg);
1025                 if (result)
1026                         return result;
1027                 /* only LIRC_MODE_PULSE supported */
1028                 if (value != LIRC_MODE_PULSE)
1029                         return -EINVAL;
1030                 break;
1031
1032         case LIRC_GET_LENGTH:
1033                 return -ENOIOCTLCMD;
1034                 break;
1035
1036         case LIRC_SET_SEND_DUTY_CYCLE:
1037                 dprintk("SET_SEND_DUTY_CYCLE\n");
1038                 if (!(hardware[type].features&LIRC_CAN_SET_SEND_DUTY_CYCLE))
1039                         return -ENOIOCTLCMD;
1040
1041                 result = get_user(value, (__u32 *) arg);
1042                 if (result)
1043                         return result;
1044                 if (value <= 0 || value > 100)
1045                         return -EINVAL;
1046                 return init_timing_params(value, freq);
1047                 break;
1048
1049         case LIRC_SET_SEND_CARRIER:
1050                 dprintk("SET_SEND_CARRIER\n");
1051                 if (!(hardware[type].features&LIRC_CAN_SET_SEND_CARRIER))
1052                         return -ENOIOCTLCMD;
1053
1054                 result = get_user(value, (__u32 *) arg);
1055                 if (result)
1056                         return result;
1057                 if (value > 500000 || value < 20000)
1058                         return -EINVAL;
1059                 return init_timing_params(duty_cycle, value);
1060                 break;
1061
1062         default:
1063                 return lirc_dev_fop_ioctl(filep, cmd, arg);
1064         }
1065         return 0;
1066 }
1067
1068 static const struct file_operations lirc_fops = {
1069         .owner          = THIS_MODULE,
1070         .write          = lirc_write,
1071         .unlocked_ioctl = lirc_ioctl,
1072 #ifdef CONFIG_COMPAT
1073         .compat_ioctl   = lirc_ioctl,
1074 #endif
1075         .read           = lirc_dev_fop_read,
1076         .poll           = lirc_dev_fop_poll,
1077         .open           = lirc_dev_fop_open,
1078         .release        = lirc_dev_fop_close,
1079         .llseek         = no_llseek,
1080 };
1081
1082 static struct lirc_driver driver = {
1083         .name           = LIRC_DRIVER_NAME,
1084         .minor          = -1,
1085         .code_length    = 1,
1086         .sample_rate    = 0,
1087         .data           = NULL,
1088         .add_to_buf     = NULL,
1089         .rbuf           = &rbuf,
1090         .set_use_inc    = set_use_inc,
1091         .set_use_dec    = set_use_dec,
1092         .fops           = &lirc_fops,
1093         .dev            = NULL,
1094         .owner          = THIS_MODULE,
1095 };
1096
1097 static struct platform_device *lirc_serial_dev;
1098
1099 static int lirc_serial_suspend(struct platform_device *dev,
1100                                pm_message_t state)
1101 {
1102         /* Set DLAB 0. */
1103         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
1104
1105         /* Disable all interrupts */
1106         soutp(UART_IER, sinp(UART_IER) &
1107               (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
1108
1109         /* Clear registers. */
1110         sinp(UART_LSR);
1111         sinp(UART_RX);
1112         sinp(UART_IIR);
1113         sinp(UART_MSR);
1114
1115         return 0;
1116 }
1117
1118 /* twisty maze... need a forward-declaration here... */
1119 static void lirc_serial_exit(void);
1120
1121 static int lirc_serial_resume(struct platform_device *dev)
1122 {
1123         unsigned long flags;
1124         int result;
1125
1126         result = hardware_init_port();
1127         if (result < 0)
1128                 return result;
1129
1130         spin_lock_irqsave(&hardware[type].lock, flags);
1131         /* Enable Interrupt */
1132         do_gettimeofday(&lasttv);
1133         soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
1134         off();
1135
1136         lirc_buffer_clear(&rbuf);
1137
1138         spin_unlock_irqrestore(&hardware[type].lock, flags);
1139
1140         return 0;
1141 }
1142
1143 static struct platform_driver lirc_serial_driver = {
1144         .probe          = lirc_serial_probe,
1145         .remove         = __devexit_p(lirc_serial_remove),
1146         .suspend        = lirc_serial_suspend,
1147         .resume         = lirc_serial_resume,
1148         .driver         = {
1149                 .name   = "lirc_serial",
1150                 .owner  = THIS_MODULE,
1151         },
1152 };
1153
1154 static int __init lirc_serial_init(void)
1155 {
1156         int result;
1157
1158         /* Init read buffer. */
1159         result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
1160         if (result < 0)
1161                 return result;
1162
1163         result = platform_driver_register(&lirc_serial_driver);
1164         if (result) {
1165                 printk("lirc register returned %d\n", result);
1166                 goto exit_buffer_free;
1167         }
1168
1169         lirc_serial_dev = platform_device_alloc("lirc_serial", 0);
1170         if (!lirc_serial_dev) {
1171                 result = -ENOMEM;
1172                 goto exit_driver_unregister;
1173         }
1174
1175         result = platform_device_add(lirc_serial_dev);
1176         if (result)
1177                 goto exit_device_put;
1178
1179         return 0;
1180
1181 exit_device_put:
1182         platform_device_put(lirc_serial_dev);
1183 exit_driver_unregister:
1184         platform_driver_unregister(&lirc_serial_driver);
1185 exit_buffer_free:
1186         lirc_buffer_free(&rbuf);
1187         return result;
1188 }
1189
1190 static void lirc_serial_exit(void)
1191 {
1192         platform_device_unregister(lirc_serial_dev);
1193         platform_driver_unregister(&lirc_serial_driver);
1194         lirc_buffer_free(&rbuf);
1195 }
1196
1197 static int __init lirc_serial_init_module(void)
1198 {
1199         int result;
1200
1201         switch (type) {
1202         case LIRC_HOMEBREW:
1203         case LIRC_IRDEO:
1204         case LIRC_IRDEO_REMOTE:
1205         case LIRC_ANIMAX:
1206         case LIRC_IGOR:
1207                 /* if nothing specified, use ttyS0/com1 and irq 4 */
1208                 io = io ? io : 0x3f8;
1209                 irq = irq ? irq : 4;
1210                 break;
1211 #ifdef CONFIG_LIRC_SERIAL_NSLU2
1212         case LIRC_NSLU2:
1213                 io = io ? io : IRQ_IXP4XX_UART2;
1214                 irq = irq ? irq : (IXP4XX_UART2_BASE_VIRT + REG_OFFSET);
1215                 iommap = iommap ? iommap : IXP4XX_UART2_BASE_PHYS;
1216                 ioshift = ioshift ? ioshift : 2;
1217                 break;
1218 #endif
1219         default:
1220                 return -EINVAL;
1221         }
1222         if (!softcarrier) {
1223                 switch (type) {
1224                 case LIRC_HOMEBREW:
1225                 case LIRC_IGOR:
1226 #ifdef CONFIG_LIRC_SERIAL_NSLU2
1227                 case LIRC_NSLU2:
1228 #endif
1229                         hardware[type].features &=
1230                                 ~(LIRC_CAN_SET_SEND_DUTY_CYCLE|
1231                                   LIRC_CAN_SET_SEND_CARRIER);
1232                         break;
1233                 }
1234         }
1235
1236         result = lirc_serial_init();
1237         if (result)
1238                 return result;
1239
1240         driver.features = hardware[type].features;
1241         driver.dev = &lirc_serial_dev->dev;
1242         driver.minor = lirc_register_driver(&driver);
1243         if (driver.minor < 0) {
1244                 printk(KERN_ERR  LIRC_DRIVER_NAME
1245                        ": register_chrdev failed!\n");
1246                 lirc_serial_exit();
1247                 return driver.minor;
1248         }
1249         return 0;
1250 }
1251
1252 static void __exit lirc_serial_exit_module(void)
1253 {
1254         lirc_unregister_driver(driver.minor);
1255         lirc_serial_exit();
1256         dprintk("cleaned up module\n");
1257 }
1258
1259
1260 module_init(lirc_serial_init_module);
1261 module_exit(lirc_serial_exit_module);
1262
1263 MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
1264 MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, "
1265               "Christoph Bartelmus, Andrei Tanas");
1266 MODULE_LICENSE("GPL");
1267
1268 module_param(type, int, S_IRUGO);
1269 MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
1270                  " 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug,"
1271                  " 5 = NSLU2 RX:CTS2/TX:GreenLED)");
1272
1273 module_param(io, int, S_IRUGO);
1274 MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
1275
1276 /* some architectures (e.g. intel xscale) have memory mapped registers */
1277 module_param(iommap, bool, S_IRUGO);
1278 MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O"
1279                 " (0 = no memory mapped io)");
1280
1281 /*
1282  * some architectures (e.g. intel xscale) align the 8bit serial registers
1283  * on 32bit word boundaries.
1284  * See linux-kernel/serial/8250.c serial_in()/out()
1285  */
1286 module_param(ioshift, int, S_IRUGO);
1287 MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
1288
1289 module_param(irq, int, S_IRUGO);
1290 MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
1291
1292 module_param(share_irq, bool, S_IRUGO);
1293 MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
1294
1295 module_param(sense, bool, S_IRUGO);
1296 MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
1297                  " (0 = active high, 1 = active low )");
1298
1299 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
1300 module_param(txsense, bool, S_IRUGO);
1301 MODULE_PARM_DESC(txsense, "Sense of transmitter circuit"
1302                  " (0 = active high, 1 = active low )");
1303 #endif
1304
1305 module_param(softcarrier, bool, S_IRUGO);
1306 MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
1307
1308 module_param(debug, bool, S_IRUGO | S_IWUSR);
1309 MODULE_PARM_DESC(debug, "Enable debugging messages");