| 1 | /* |
| 2 | * LIRC driver for ITE IT8712/IT8705 CIR port |
| 3 | * |
| 4 | * Copyright (C) 2001 Hans-Gunter Lutke Uphues <hg_lu@web.de> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation; either version 2 of the |
| 9 | * License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 19 | * USA |
| 20 | * |
| 21 | * ITE IT8705 and IT8712(not tested) and IT8720 CIR-port support for lirc based |
| 22 | * via cut and paste from lirc_sir.c (C) 2000 Milan Pikula |
| 23 | * |
| 24 | * Attention: Sendmode only tested with debugging logs |
| 25 | * |
| 26 | * 2001/02/27 Christoph Bartelmus <lirc@bartelmus.de> : |
| 27 | * reimplemented read function |
| 28 | * 2005/06/05 Andrew Calkin implemented support for Asus Digimatrix, |
| 29 | * based on work of the following member of the Outertrack Digimatrix |
| 30 | * Forum: Art103 <r_tay@hotmail.com> |
| 31 | * 2009/12/24 James Edwards <jimbo-lirc@edwardsclan.net> implemeted support |
| 32 | * for ITE8704/ITE8718, on my machine, the DSDT reports 8704, but the |
| 33 | * chip identifies as 18. |
| 34 | */ |
| 35 | |
| 36 | #include <linux/module.h> |
| 37 | #include <linux/sched.h> |
| 38 | #include <linux/errno.h> |
| 39 | #include <linux/signal.h> |
| 40 | #include <linux/fs.h> |
| 41 | #include <linux/interrupt.h> |
| 42 | #include <linux/ioport.h> |
| 43 | #include <linux/kernel.h> |
| 44 | #include <linux/time.h> |
| 45 | #include <linux/string.h> |
| 46 | #include <linux/types.h> |
| 47 | #include <linux/wait.h> |
| 48 | #include <linux/mm.h> |
| 49 | #include <linux/delay.h> |
| 50 | #include <linux/poll.h> |
| 51 | #include <asm/system.h> |
| 52 | #include <linux/io.h> |
| 53 | #include <linux/irq.h> |
| 54 | #include <linux/fcntl.h> |
| 55 | |
| 56 | #include <linux/timer.h> |
| 57 | #include <linux/pnp.h> |
| 58 | |
| 59 | #include <media/lirc.h> |
| 60 | #include <media/lirc_dev.h> |
| 61 | |
| 62 | #include "lirc_it87.h" |
| 63 | |
| 64 | #ifdef LIRC_IT87_DIGIMATRIX |
| 65 | static int digimatrix = 1; |
| 66 | static int it87_freq = 36; /* kHz */ |
| 67 | static int irq = 9; |
| 68 | #else |
| 69 | static int digimatrix; |
| 70 | static int it87_freq = 38; /* kHz */ |
| 71 | static int irq = IT87_CIR_DEFAULT_IRQ; |
| 72 | #endif |
| 73 | |
| 74 | static unsigned long it87_bits_in_byte_out; |
| 75 | static unsigned long it87_send_counter; |
| 76 | static unsigned char it87_RXEN_mask = IT87_CIR_RCR_RXEN; |
| 77 | |
| 78 | #define RBUF_LEN 1024 |
| 79 | |
| 80 | #define LIRC_DRIVER_NAME "lirc_it87" |
| 81 | |
| 82 | /* timeout for sequences in jiffies (=5/100s) */ |
| 83 | /* must be longer than TIME_CONST */ |
| 84 | #define IT87_TIMEOUT (HZ*5/100) |
| 85 | |
| 86 | /* module parameters */ |
| 87 | static int debug; |
| 88 | #define dprintk(fmt, args...) \ |
| 89 | do { \ |
| 90 | if (debug) \ |
| 91 | printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \ |
| 92 | fmt, ## args); \ |
| 93 | } while (0) |
| 94 | |
| 95 | static int io = IT87_CIR_DEFAULT_IOBASE; |
| 96 | /* receiver demodulator default: off */ |
| 97 | static int it87_enable_demodulator; |
| 98 | |
| 99 | static int timer_enabled; |
| 100 | static DEFINE_SPINLOCK(timer_lock); |
| 101 | static struct timer_list timerlist; |
| 102 | /* time of last signal change detected */ |
| 103 | static struct timeval last_tv = {0, 0}; |
| 104 | /* time of last UART data ready interrupt */ |
| 105 | static struct timeval last_intr_tv = {0, 0}; |
| 106 | static int last_value; |
| 107 | |
| 108 | static DECLARE_WAIT_QUEUE_HEAD(lirc_read_queue); |
| 109 | |
| 110 | static DEFINE_SPINLOCK(hardware_lock); |
| 111 | static DEFINE_SPINLOCK(dev_lock); |
| 112 | static bool device_open; |
| 113 | |
| 114 | static int rx_buf[RBUF_LEN]; |
| 115 | unsigned int rx_tail, rx_head; |
| 116 | |
| 117 | static struct pnp_driver it87_pnp_driver; |
| 118 | |
| 119 | /* SECTION: Prototypes */ |
| 120 | |
| 121 | /* Communication with user-space */ |
| 122 | static int lirc_open(struct inode *inode, struct file *file); |
| 123 | static int lirc_close(struct inode *inode, struct file *file); |
| 124 | static unsigned int lirc_poll(struct file *file, poll_table *wait); |
| 125 | static ssize_t lirc_read(struct file *file, char *buf, |
| 126 | size_t count, loff_t *ppos); |
| 127 | static ssize_t lirc_write(struct file *file, const char *buf, |
| 128 | size_t n, loff_t *pos); |
| 129 | static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg); |
| 130 | static void add_read_queue(int flag, unsigned long val); |
| 131 | static int init_chrdev(void); |
| 132 | static void drop_chrdev(void); |
| 133 | /* Hardware */ |
| 134 | static irqreturn_t it87_interrupt(int irq, void *dev_id); |
| 135 | static void send_space(unsigned long len); |
| 136 | static void send_pulse(unsigned long len); |
| 137 | static void init_send(void); |
| 138 | static void terminate_send(unsigned long len); |
| 139 | static int init_hardware(void); |
| 140 | static void drop_hardware(void); |
| 141 | /* Initialisation */ |
| 142 | static int init_port(void); |
| 143 | static void drop_port(void); |
| 144 | |
| 145 | |
| 146 | /* SECTION: Communication with user-space */ |
| 147 | |
| 148 | static int lirc_open(struct inode *inode, struct file *file) |
| 149 | { |
| 150 | spin_lock(&dev_lock); |
| 151 | if (device_open) { |
| 152 | spin_unlock(&dev_lock); |
| 153 | return -EBUSY; |
| 154 | } |
| 155 | device_open = true; |
| 156 | spin_unlock(&dev_lock); |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | static int lirc_close(struct inode *inode, struct file *file) |
| 162 | { |
| 163 | spin_lock(&dev_lock); |
| 164 | device_open = false; |
| 165 | spin_unlock(&dev_lock); |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | |
| 170 | static unsigned int lirc_poll(struct file *file, poll_table *wait) |
| 171 | { |
| 172 | poll_wait(file, &lirc_read_queue, wait); |
| 173 | if (rx_head != rx_tail) |
| 174 | return POLLIN | POLLRDNORM; |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | static ssize_t lirc_read(struct file *file, char *buf, |
| 180 | size_t count, loff_t *ppos) |
| 181 | { |
| 182 | int n = 0; |
| 183 | int retval = 0; |
| 184 | |
| 185 | while (n < count) { |
| 186 | if (file->f_flags & O_NONBLOCK && rx_head == rx_tail) { |
| 187 | retval = -EAGAIN; |
| 188 | break; |
| 189 | } |
| 190 | retval = wait_event_interruptible(lirc_read_queue, |
| 191 | rx_head != rx_tail); |
| 192 | if (retval) |
| 193 | break; |
| 194 | |
| 195 | if (copy_to_user((void *) buf + n, (void *) (rx_buf + rx_head), |
| 196 | sizeof(int))) { |
| 197 | retval = -EFAULT; |
| 198 | break; |
| 199 | } |
| 200 | rx_head = (rx_head + 1) & (RBUF_LEN - 1); |
| 201 | n += sizeof(int); |
| 202 | } |
| 203 | if (n) |
| 204 | return n; |
| 205 | return retval; |
| 206 | } |
| 207 | |
| 208 | |
| 209 | static ssize_t lirc_write(struct file *file, const char *buf, |
| 210 | size_t n, loff_t *pos) |
| 211 | { |
| 212 | int i = 0; |
| 213 | int *tx_buf; |
| 214 | |
| 215 | if (n % sizeof(int)) |
| 216 | return -EINVAL; |
| 217 | tx_buf = memdup_user(buf, n); |
| 218 | if (IS_ERR(tx_buf)) |
| 219 | return PTR_ERR(tx_buf); |
| 220 | n /= sizeof(int); |
| 221 | init_send(); |
| 222 | while (1) { |
| 223 | if (i >= n) |
| 224 | break; |
| 225 | if (tx_buf[i]) |
| 226 | send_pulse(tx_buf[i]); |
| 227 | i++; |
| 228 | if (i >= n) |
| 229 | break; |
| 230 | if (tx_buf[i]) |
| 231 | send_space(tx_buf[i]); |
| 232 | i++; |
| 233 | } |
| 234 | terminate_send(tx_buf[i - 1]); |
| 235 | return n; |
| 236 | } |
| 237 | |
| 238 | |
| 239 | static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) |
| 240 | { |
| 241 | int retval = 0; |
| 242 | unsigned long value = 0; |
| 243 | unsigned int ivalue; |
| 244 | unsigned long hw_flags; |
| 245 | |
| 246 | if (cmd == LIRC_GET_FEATURES) |
| 247 | value = LIRC_CAN_SEND_PULSE | |
| 248 | LIRC_CAN_SET_SEND_CARRIER | |
| 249 | LIRC_CAN_REC_MODE2; |
| 250 | else if (cmd == LIRC_GET_SEND_MODE) |
| 251 | value = LIRC_MODE_PULSE; |
| 252 | else if (cmd == LIRC_GET_REC_MODE) |
| 253 | value = LIRC_MODE_MODE2; |
| 254 | |
| 255 | switch (cmd) { |
| 256 | case LIRC_GET_FEATURES: |
| 257 | case LIRC_GET_SEND_MODE: |
| 258 | case LIRC_GET_REC_MODE: |
| 259 | retval = put_user(value, (unsigned long *) arg); |
| 260 | break; |
| 261 | |
| 262 | case LIRC_SET_SEND_MODE: |
| 263 | case LIRC_SET_REC_MODE: |
| 264 | retval = get_user(value, (unsigned long *) arg); |
| 265 | break; |
| 266 | |
| 267 | case LIRC_SET_SEND_CARRIER: |
| 268 | retval = get_user(ivalue, (unsigned int *) arg); |
| 269 | if (retval) |
| 270 | return retval; |
| 271 | ivalue /= 1000; |
| 272 | if (ivalue > IT87_CIR_FREQ_MAX || |
| 273 | ivalue < IT87_CIR_FREQ_MIN) |
| 274 | return -EINVAL; |
| 275 | |
| 276 | it87_freq = ivalue; |
| 277 | |
| 278 | spin_lock_irqsave(&hardware_lock, hw_flags); |
| 279 | outb(((inb(io + IT87_CIR_TCR2) & IT87_CIR_TCR2_TXMPW) | |
| 280 | (it87_freq - IT87_CIR_FREQ_MIN) << 3), |
| 281 | io + IT87_CIR_TCR2); |
| 282 | spin_unlock_irqrestore(&hardware_lock, hw_flags); |
| 283 | dprintk("demodulation frequency: %d kHz\n", it87_freq); |
| 284 | |
| 285 | break; |
| 286 | |
| 287 | default: |
| 288 | retval = -EINVAL; |
| 289 | } |
| 290 | |
| 291 | if (retval) |
| 292 | return retval; |
| 293 | |
| 294 | if (cmd == LIRC_SET_REC_MODE) { |
| 295 | if (value != LIRC_MODE_MODE2) |
| 296 | retval = -ENOSYS; |
| 297 | } else if (cmd == LIRC_SET_SEND_MODE) { |
| 298 | if (value != LIRC_MODE_PULSE) |
| 299 | retval = -ENOSYS; |
| 300 | } |
| 301 | return retval; |
| 302 | } |
| 303 | |
| 304 | static void add_read_queue(int flag, unsigned long val) |
| 305 | { |
| 306 | unsigned int new_rx_tail; |
| 307 | int newval; |
| 308 | |
| 309 | dprintk("add flag %d with val %lu\n", flag, val); |
| 310 | |
| 311 | newval = val & PULSE_MASK; |
| 312 | |
| 313 | /* |
| 314 | * statistically, pulses are ~TIME_CONST/2 too long. we could |
| 315 | * maybe make this more exact, but this is good enough |
| 316 | */ |
| 317 | if (flag) { |
| 318 | /* pulse */ |
| 319 | if (newval > TIME_CONST / 2) |
| 320 | newval -= TIME_CONST / 2; |
| 321 | else /* should not ever happen */ |
| 322 | newval = 1; |
| 323 | newval |= PULSE_BIT; |
| 324 | } else |
| 325 | newval += TIME_CONST / 2; |
| 326 | new_rx_tail = (rx_tail + 1) & (RBUF_LEN - 1); |
| 327 | if (new_rx_tail == rx_head) { |
| 328 | dprintk("Buffer overrun.\n"); |
| 329 | return; |
| 330 | } |
| 331 | rx_buf[rx_tail] = newval; |
| 332 | rx_tail = new_rx_tail; |
| 333 | wake_up_interruptible(&lirc_read_queue); |
| 334 | } |
| 335 | |
| 336 | |
| 337 | static const struct file_operations lirc_fops = { |
| 338 | .owner = THIS_MODULE, |
| 339 | .read = lirc_read, |
| 340 | .write = lirc_write, |
| 341 | .poll = lirc_poll, |
| 342 | .unlocked_ioctl = lirc_ioctl, |
| 343 | .open = lirc_open, |
| 344 | .release = lirc_close, |
| 345 | .llseek = noop_llseek, |
| 346 | }; |
| 347 | |
| 348 | static int set_use_inc(void *data) |
| 349 | { |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | static void set_use_dec(void *data) |
| 354 | { |
| 355 | } |
| 356 | |
| 357 | static struct lirc_driver driver = { |
| 358 | .name = LIRC_DRIVER_NAME, |
| 359 | .minor = -1, |
| 360 | .code_length = 1, |
| 361 | .sample_rate = 0, |
| 362 | .data = NULL, |
| 363 | .add_to_buf = NULL, |
| 364 | .set_use_inc = set_use_inc, |
| 365 | .set_use_dec = set_use_dec, |
| 366 | .fops = &lirc_fops, |
| 367 | .dev = NULL, |
| 368 | .owner = THIS_MODULE, |
| 369 | }; |
| 370 | |
| 371 | |
| 372 | static int init_chrdev(void) |
| 373 | { |
| 374 | driver.minor = lirc_register_driver(&driver); |
| 375 | |
| 376 | if (driver.minor < 0) { |
| 377 | printk(KERN_ERR LIRC_DRIVER_NAME ": init_chrdev() failed.\n"); |
| 378 | return -EIO; |
| 379 | } |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | |
| 384 | static void drop_chrdev(void) |
| 385 | { |
| 386 | lirc_unregister_driver(driver.minor); |
| 387 | } |
| 388 | |
| 389 | |
| 390 | /* SECTION: Hardware */ |
| 391 | static long delta(struct timeval *tv1, struct timeval *tv2) |
| 392 | { |
| 393 | unsigned long deltv; |
| 394 | |
| 395 | deltv = tv2->tv_sec - tv1->tv_sec; |
| 396 | if (deltv > 15) |
| 397 | deltv = 0xFFFFFF; |
| 398 | else |
| 399 | deltv = deltv*1000000 + tv2->tv_usec - tv1->tv_usec; |
| 400 | return deltv; |
| 401 | } |
| 402 | |
| 403 | static void it87_timeout(unsigned long data) |
| 404 | { |
| 405 | unsigned long flags; |
| 406 | |
| 407 | /* avoid interference with interrupt */ |
| 408 | spin_lock_irqsave(&timer_lock, flags); |
| 409 | |
| 410 | if (digimatrix) { |
| 411 | /* We have timed out. Disable the RX mechanism. */ |
| 412 | |
| 413 | outb((inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN) | |
| 414 | IT87_CIR_RCR_RXACT, io + IT87_CIR_RCR); |
| 415 | if (it87_RXEN_mask) |
| 416 | outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN, |
| 417 | io + IT87_CIR_RCR); |
| 418 | dprintk(" TIMEOUT\n"); |
| 419 | timer_enabled = 0; |
| 420 | |
| 421 | /* fifo clear */ |
| 422 | outb(inb(io + IT87_CIR_TCR1) | IT87_CIR_TCR1_FIFOCLR, |
| 423 | io+IT87_CIR_TCR1); |
| 424 | |
| 425 | } else { |
| 426 | /* |
| 427 | * if last received signal was a pulse, but receiving stopped |
| 428 | * within the 9 bit frame, we need to finish this pulse and |
| 429 | * simulate a signal change to from pulse to space. Otherwise |
| 430 | * upper layers will receive two sequences next time. |
| 431 | */ |
| 432 | |
| 433 | if (last_value) { |
| 434 | unsigned long pulse_end; |
| 435 | |
| 436 | /* determine 'virtual' pulse end: */ |
| 437 | pulse_end = delta(&last_tv, &last_intr_tv); |
| 438 | dprintk("timeout add %d for %lu usec\n", |
| 439 | last_value, pulse_end); |
| 440 | add_read_queue(last_value, pulse_end); |
| 441 | last_value = 0; |
| 442 | last_tv = last_intr_tv; |
| 443 | } |
| 444 | } |
| 445 | spin_unlock_irqrestore(&timer_lock, flags); |
| 446 | } |
| 447 | |
| 448 | static irqreturn_t it87_interrupt(int irq, void *dev_id) |
| 449 | { |
| 450 | unsigned char data; |
| 451 | struct timeval curr_tv; |
| 452 | static unsigned long deltv; |
| 453 | unsigned long deltintrtv; |
| 454 | unsigned long flags, hw_flags; |
| 455 | int iir, lsr; |
| 456 | int fifo = 0; |
| 457 | static char lastbit; |
| 458 | char bit; |
| 459 | |
| 460 | /* Bit duration in microseconds */ |
| 461 | const unsigned long bit_duration = 1000000ul / |
| 462 | (115200 / IT87_CIR_BAUDRATE_DIVISOR); |
| 463 | |
| 464 | |
| 465 | iir = inb(io + IT87_CIR_IIR); |
| 466 | |
| 467 | switch (iir & IT87_CIR_IIR_IID) { |
| 468 | case 0x4: |
| 469 | case 0x6: |
| 470 | lsr = inb(io + IT87_CIR_RSR) & (IT87_CIR_RSR_RXFTO | |
| 471 | IT87_CIR_RSR_RXFBC); |
| 472 | fifo = lsr & IT87_CIR_RSR_RXFBC; |
| 473 | dprintk("iir: 0x%x fifo: 0x%x\n", iir, lsr); |
| 474 | |
| 475 | /* avoid interference with timer */ |
| 476 | spin_lock_irqsave(&timer_lock, flags); |
| 477 | spin_lock_irqsave(&hardware_lock, hw_flags); |
| 478 | if (digimatrix) { |
| 479 | static unsigned long acc_pulse; |
| 480 | static unsigned long acc_space; |
| 481 | |
| 482 | do { |
| 483 | data = inb(io + IT87_CIR_DR); |
| 484 | data = ~data; |
| 485 | fifo--; |
| 486 | if (data != 0x00) { |
| 487 | if (timer_enabled) |
| 488 | del_timer(&timerlist); |
| 489 | /* |
| 490 | * start timer for end of |
| 491 | * sequence detection |
| 492 | */ |
| 493 | timerlist.expires = jiffies + |
| 494 | IT87_TIMEOUT; |
| 495 | add_timer(&timerlist); |
| 496 | timer_enabled = 1; |
| 497 | } |
| 498 | /* Loop through */ |
| 499 | for (bit = 0; bit < 8; ++bit) { |
| 500 | if ((data >> bit) & 1) { |
| 501 | ++acc_pulse; |
| 502 | if (lastbit == 0) { |
| 503 | add_read_queue(0, |
| 504 | acc_space * |
| 505 | bit_duration); |
| 506 | acc_space = 0; |
| 507 | } |
| 508 | } else { |
| 509 | ++acc_space; |
| 510 | if (lastbit == 1) { |
| 511 | add_read_queue(1, |
| 512 | acc_pulse * |
| 513 | bit_duration); |
| 514 | acc_pulse = 0; |
| 515 | } |
| 516 | } |
| 517 | lastbit = (data >> bit) & 1; |
| 518 | } |
| 519 | |
| 520 | } while (fifo != 0); |
| 521 | } else { /* Normal Operation */ |
| 522 | do { |
| 523 | del_timer(&timerlist); |
| 524 | data = inb(io + IT87_CIR_DR); |
| 525 | |
| 526 | dprintk("data=%02x\n", data); |
| 527 | do_gettimeofday(&curr_tv); |
| 528 | deltv = delta(&last_tv, &curr_tv); |
| 529 | deltintrtv = delta(&last_intr_tv, &curr_tv); |
| 530 | |
| 531 | dprintk("t %lu , d %d\n", |
| 532 | deltintrtv, (int)data); |
| 533 | |
| 534 | /* |
| 535 | * if nothing came in last 2 cycles, |
| 536 | * it was gap |
| 537 | */ |
| 538 | if (deltintrtv > TIME_CONST * 2) { |
| 539 | if (last_value) { |
| 540 | dprintk("GAP\n"); |
| 541 | |
| 542 | /* simulate signal change */ |
| 543 | add_read_queue(last_value, |
| 544 | deltv - |
| 545 | deltintrtv); |
| 546 | last_value = 0; |
| 547 | last_tv.tv_sec = |
| 548 | last_intr_tv.tv_sec; |
| 549 | last_tv.tv_usec = |
| 550 | last_intr_tv.tv_usec; |
| 551 | deltv = deltintrtv; |
| 552 | } |
| 553 | } |
| 554 | data = 1; |
| 555 | if (data ^ last_value) { |
| 556 | /* |
| 557 | * deltintrtv > 2*TIME_CONST, |
| 558 | * remember ? the other case is |
| 559 | * timeout |
| 560 | */ |
| 561 | add_read_queue(last_value, |
| 562 | deltv-TIME_CONST); |
| 563 | last_value = data; |
| 564 | last_tv = curr_tv; |
| 565 | if (last_tv.tv_usec >= TIME_CONST) |
| 566 | last_tv.tv_usec -= TIME_CONST; |
| 567 | else { |
| 568 | last_tv.tv_sec--; |
| 569 | last_tv.tv_usec += 1000000 - |
| 570 | TIME_CONST; |
| 571 | } |
| 572 | } |
| 573 | last_intr_tv = curr_tv; |
| 574 | if (data) { |
| 575 | /* |
| 576 | * start timer for end of |
| 577 | * sequence detection |
| 578 | */ |
| 579 | timerlist.expires = |
| 580 | jiffies + IT87_TIMEOUT; |
| 581 | add_timer(&timerlist); |
| 582 | } |
| 583 | outb((inb(io + IT87_CIR_RCR) & |
| 584 | ~IT87_CIR_RCR_RXEN) | |
| 585 | IT87_CIR_RCR_RXACT, |
| 586 | io + IT87_CIR_RCR); |
| 587 | if (it87_RXEN_mask) |
| 588 | outb(inb(io + IT87_CIR_RCR) | |
| 589 | IT87_CIR_RCR_RXEN, |
| 590 | io + IT87_CIR_RCR); |
| 591 | fifo--; |
| 592 | } while (fifo != 0); |
| 593 | } |
| 594 | spin_unlock_irqrestore(&hardware_lock, hw_flags); |
| 595 | spin_unlock_irqrestore(&timer_lock, flags); |
| 596 | |
| 597 | return IRQ_RETVAL(IRQ_HANDLED); |
| 598 | |
| 599 | default: |
| 600 | /* not our irq */ |
| 601 | dprintk("unknown IRQ (shouldn't happen) !!\n"); |
| 602 | return IRQ_RETVAL(IRQ_NONE); |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | |
| 607 | static void send_it87(unsigned long len, unsigned long stime, |
| 608 | unsigned char send_byte, unsigned int count_bits) |
| 609 | { |
| 610 | long count = len / stime; |
| 611 | long time_left = 0; |
| 612 | static unsigned char byte_out; |
| 613 | unsigned long hw_flags; |
| 614 | |
| 615 | dprintk("%s: len=%ld, sb=%d\n", __func__, len, send_byte); |
| 616 | |
| 617 | time_left = (long)len - (long)count * (long)stime; |
| 618 | count += ((2 * time_left) / stime); |
| 619 | while (count) { |
| 620 | long i = 0; |
| 621 | for (i = 0; i < count_bits; i++) { |
| 622 | byte_out = (byte_out << 1) | (send_byte & 1); |
| 623 | it87_bits_in_byte_out++; |
| 624 | } |
| 625 | if (it87_bits_in_byte_out == 8) { |
| 626 | dprintk("out=0x%x, tsr_txfbc: 0x%x\n", |
| 627 | byte_out, |
| 628 | inb(io + IT87_CIR_TSR) & |
| 629 | IT87_CIR_TSR_TXFBC); |
| 630 | |
| 631 | while ((inb(io + IT87_CIR_TSR) & |
| 632 | IT87_CIR_TSR_TXFBC) >= IT87_CIR_FIFO_SIZE) |
| 633 | ; |
| 634 | |
| 635 | spin_lock_irqsave(&hardware_lock, hw_flags); |
| 636 | outb(byte_out, io + IT87_CIR_DR); |
| 637 | spin_unlock_irqrestore(&hardware_lock, hw_flags); |
| 638 | |
| 639 | it87_bits_in_byte_out = 0; |
| 640 | it87_send_counter++; |
| 641 | byte_out = 0; |
| 642 | } |
| 643 | count--; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | |
| 648 | /*TODO: maybe exchange space and pulse because it8705 only modulates 0-bits */ |
| 649 | |
| 650 | static void send_space(unsigned long len) |
| 651 | { |
| 652 | send_it87(len, TIME_CONST, IT87_CIR_SPACE, IT87_CIR_BAUDRATE_DIVISOR); |
| 653 | } |
| 654 | |
| 655 | static void send_pulse(unsigned long len) |
| 656 | { |
| 657 | send_it87(len, TIME_CONST, IT87_CIR_PULSE, IT87_CIR_BAUDRATE_DIVISOR); |
| 658 | } |
| 659 | |
| 660 | |
| 661 | static void init_send() |
| 662 | { |
| 663 | unsigned long flags; |
| 664 | |
| 665 | spin_lock_irqsave(&hardware_lock, flags); |
| 666 | /* RXEN=0: receiver disable */ |
| 667 | it87_RXEN_mask = 0; |
| 668 | outb(inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN, |
| 669 | io + IT87_CIR_RCR); |
| 670 | spin_unlock_irqrestore(&hardware_lock, flags); |
| 671 | it87_bits_in_byte_out = 0; |
| 672 | it87_send_counter = 0; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | static void terminate_send(unsigned long len) |
| 677 | { |
| 678 | unsigned long flags; |
| 679 | unsigned long last = 0; |
| 680 | |
| 681 | last = it87_send_counter; |
| 682 | /* make sure all necessary data has been sent */ |
| 683 | while (last == it87_send_counter) |
| 684 | send_space(len); |
| 685 | /* wait until all data sent */ |
| 686 | while ((inb(io + IT87_CIR_TSR) & IT87_CIR_TSR_TXFBC) != 0) |
| 687 | ; |
| 688 | /* then re-enable receiver */ |
| 689 | spin_lock_irqsave(&hardware_lock, flags); |
| 690 | it87_RXEN_mask = IT87_CIR_RCR_RXEN; |
| 691 | outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN, |
| 692 | io + IT87_CIR_RCR); |
| 693 | spin_unlock_irqrestore(&hardware_lock, flags); |
| 694 | } |
| 695 | |
| 696 | |
| 697 | static int init_hardware(void) |
| 698 | { |
| 699 | unsigned long flags; |
| 700 | unsigned char it87_rcr = 0; |
| 701 | |
| 702 | spin_lock_irqsave(&hardware_lock, flags); |
| 703 | /* init cir-port */ |
| 704 | /* enable r/w-access to Baudrate-Register */ |
| 705 | outb(IT87_CIR_IER_BR, io + IT87_CIR_IER); |
| 706 | outb(IT87_CIR_BAUDRATE_DIVISOR % 0x100, io+IT87_CIR_BDLR); |
| 707 | outb(IT87_CIR_BAUDRATE_DIVISOR / 0x100, io+IT87_CIR_BDHR); |
| 708 | /* Baudrate Register off, define IRQs: Input only */ |
| 709 | if (digimatrix) { |
| 710 | outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RFOIE, io + IT87_CIR_IER); |
| 711 | /* RX: HCFS=0, RXDCR = 001b (33,75..38,25 kHz), RXEN=1 */ |
| 712 | } else { |
| 713 | outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RDAIE, io + IT87_CIR_IER); |
| 714 | /* RX: HCFS=0, RXDCR = 001b (35,6..40,3 kHz), RXEN=1 */ |
| 715 | } |
| 716 | it87_rcr = (IT87_CIR_RCR_RXEN & it87_RXEN_mask) | 0x1; |
| 717 | if (it87_enable_demodulator) |
| 718 | it87_rcr |= IT87_CIR_RCR_RXEND; |
| 719 | outb(it87_rcr, io + IT87_CIR_RCR); |
| 720 | if (digimatrix) { |
| 721 | /* Set FIFO depth to 1 byte, and disable TX */ |
| 722 | outb(inb(io + IT87_CIR_TCR1) | 0x00, |
| 723 | io + IT87_CIR_TCR1); |
| 724 | |
| 725 | /* |
| 726 | * TX: it87_freq (36kHz), 'reserved' sensitivity |
| 727 | * setting (0x00) |
| 728 | */ |
| 729 | outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x00, |
| 730 | io + IT87_CIR_TCR2); |
| 731 | } else { |
| 732 | /* TX: 38kHz, 13,3us (pulse-width) */ |
| 733 | outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x06, |
| 734 | io + IT87_CIR_TCR2); |
| 735 | } |
| 736 | spin_unlock_irqrestore(&hardware_lock, flags); |
| 737 | return 0; |
| 738 | } |
| 739 | |
| 740 | |
| 741 | static void drop_hardware(void) |
| 742 | { |
| 743 | unsigned long flags; |
| 744 | |
| 745 | spin_lock_irqsave(&hardware_lock, flags); |
| 746 | disable_irq(irq); |
| 747 | /* receiver disable */ |
| 748 | it87_RXEN_mask = 0; |
| 749 | outb(0x1, io + IT87_CIR_RCR); |
| 750 | /* turn off irqs */ |
| 751 | outb(0, io + IT87_CIR_IER); |
| 752 | /* fifo clear */ |
| 753 | outb(IT87_CIR_TCR1_FIFOCLR, io+IT87_CIR_TCR1); |
| 754 | /* reset */ |
| 755 | outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER); |
| 756 | enable_irq(irq); |
| 757 | spin_unlock_irqrestore(&hardware_lock, flags); |
| 758 | } |
| 759 | |
| 760 | |
| 761 | static unsigned char it87_read(unsigned char port) |
| 762 | { |
| 763 | outb(port, IT87_ADRPORT); |
| 764 | return inb(IT87_DATAPORT); |
| 765 | } |
| 766 | |
| 767 | |
| 768 | static void it87_write(unsigned char port, unsigned char data) |
| 769 | { |
| 770 | outb(port, IT87_ADRPORT); |
| 771 | outb(data, IT87_DATAPORT); |
| 772 | } |
| 773 | |
| 774 | |
| 775 | /* SECTION: Initialisation */ |
| 776 | |
| 777 | static int init_port(void) |
| 778 | { |
| 779 | unsigned long hw_flags; |
| 780 | int retval = 0; |
| 781 | |
| 782 | unsigned char init_bytes[4] = IT87_INIT; |
| 783 | unsigned char it87_chipid = 0; |
| 784 | unsigned char ldn = 0; |
| 785 | unsigned int it87_io = 0; |
| 786 | unsigned int it87_irq = 0; |
| 787 | |
| 788 | /* Enter MB PnP Mode */ |
| 789 | outb(init_bytes[0], IT87_ADRPORT); |
| 790 | outb(init_bytes[1], IT87_ADRPORT); |
| 791 | outb(init_bytes[2], IT87_ADRPORT); |
| 792 | outb(init_bytes[3], IT87_ADRPORT); |
| 793 | |
| 794 | /* 8712 or 8705 ? */ |
| 795 | it87_chipid = it87_read(IT87_CHIP_ID1); |
| 796 | if (it87_chipid != 0x87) { |
| 797 | retval = -ENXIO; |
| 798 | return retval; |
| 799 | } |
| 800 | it87_chipid = it87_read(IT87_CHIP_ID2); |
| 801 | if ((it87_chipid != 0x05) && |
| 802 | (it87_chipid != 0x12) && |
| 803 | (it87_chipid != 0x18) && |
| 804 | (it87_chipid != 0x20)) { |
| 805 | printk(KERN_INFO LIRC_DRIVER_NAME |
| 806 | ": no IT8704/05/12/18/20 found (claimed IT87%02x), " |
| 807 | "exiting..\n", it87_chipid); |
| 808 | retval = -ENXIO; |
| 809 | return retval; |
| 810 | } |
| 811 | printk(KERN_INFO LIRC_DRIVER_NAME |
| 812 | ": found IT87%02x.\n", |
| 813 | it87_chipid); |
| 814 | |
| 815 | /* get I/O-Port and IRQ */ |
| 816 | if (it87_chipid == 0x12 || it87_chipid == 0x18) |
| 817 | ldn = IT8712_CIR_LDN; |
| 818 | else |
| 819 | ldn = IT8705_CIR_LDN; |
| 820 | it87_write(IT87_LDN, ldn); |
| 821 | |
| 822 | it87_io = it87_read(IT87_CIR_BASE_MSB) * 256 + |
| 823 | it87_read(IT87_CIR_BASE_LSB); |
| 824 | if (it87_io == 0) { |
| 825 | if (io == 0) |
| 826 | io = IT87_CIR_DEFAULT_IOBASE; |
| 827 | printk(KERN_INFO LIRC_DRIVER_NAME |
| 828 | ": set default io 0x%x\n", |
| 829 | io); |
| 830 | it87_write(IT87_CIR_BASE_MSB, io / 0x100); |
| 831 | it87_write(IT87_CIR_BASE_LSB, io % 0x100); |
| 832 | } else |
| 833 | io = it87_io; |
| 834 | |
| 835 | it87_irq = it87_read(IT87_CIR_IRQ); |
| 836 | if (digimatrix || it87_irq == 0) { |
| 837 | if (irq == 0) |
| 838 | irq = IT87_CIR_DEFAULT_IRQ; |
| 839 | printk(KERN_INFO LIRC_DRIVER_NAME |
| 840 | ": set default irq 0x%x\n", |
| 841 | irq); |
| 842 | it87_write(IT87_CIR_IRQ, irq); |
| 843 | } else |
| 844 | irq = it87_irq; |
| 845 | |
| 846 | spin_lock_irqsave(&hardware_lock, hw_flags); |
| 847 | /* reset */ |
| 848 | outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER); |
| 849 | /* fifo clear */ |
| 850 | outb(IT87_CIR_TCR1_FIFOCLR | |
| 851 | /* IT87_CIR_TCR1_ILE | */ |
| 852 | IT87_CIR_TCR1_TXRLE | |
| 853 | IT87_CIR_TCR1_TXENDF, io+IT87_CIR_TCR1); |
| 854 | spin_unlock_irqrestore(&hardware_lock, hw_flags); |
| 855 | |
| 856 | /* get I/O port access and IRQ line */ |
| 857 | if (request_region(io, 8, LIRC_DRIVER_NAME) == NULL) { |
| 858 | printk(KERN_ERR LIRC_DRIVER_NAME |
| 859 | ": i/o port 0x%.4x already in use.\n", io); |
| 860 | /* Leaving MB PnP Mode */ |
| 861 | it87_write(IT87_CFGCTRL, 0x2); |
| 862 | return -EBUSY; |
| 863 | } |
| 864 | |
| 865 | /* activate CIR-Device */ |
| 866 | it87_write(IT87_CIR_ACT, 0x1); |
| 867 | |
| 868 | /* Leaving MB PnP Mode */ |
| 869 | it87_write(IT87_CFGCTRL, 0x2); |
| 870 | |
| 871 | retval = request_irq(irq, it87_interrupt, 0 /*IRQF_DISABLED*/, |
| 872 | LIRC_DRIVER_NAME, NULL); |
| 873 | if (retval < 0) { |
| 874 | printk(KERN_ERR LIRC_DRIVER_NAME |
| 875 | ": IRQ %d already in use.\n", |
| 876 | irq); |
| 877 | release_region(io, 8); |
| 878 | return retval; |
| 879 | } |
| 880 | |
| 881 | printk(KERN_INFO LIRC_DRIVER_NAME |
| 882 | ": I/O port 0x%.4x, IRQ %d.\n", io, irq); |
| 883 | |
| 884 | init_timer(&timerlist); |
| 885 | timerlist.function = it87_timeout; |
| 886 | timerlist.data = 0xabadcafe; |
| 887 | |
| 888 | return 0; |
| 889 | } |
| 890 | |
| 891 | |
| 892 | static void drop_port(void) |
| 893 | { |
| 894 | #if 0 |
| 895 | unsigned char init_bytes[4] = IT87_INIT; |
| 896 | |
| 897 | /* Enter MB PnP Mode */ |
| 898 | outb(init_bytes[0], IT87_ADRPORT); |
| 899 | outb(init_bytes[1], IT87_ADRPORT); |
| 900 | outb(init_bytes[2], IT87_ADRPORT); |
| 901 | outb(init_bytes[3], IT87_ADRPORT); |
| 902 | |
| 903 | /* deactivate CIR-Device */ |
| 904 | it87_write(IT87_CIR_ACT, 0x0); |
| 905 | |
| 906 | /* Leaving MB PnP Mode */ |
| 907 | it87_write(IT87_CFGCTRL, 0x2); |
| 908 | #endif |
| 909 | |
| 910 | del_timer_sync(&timerlist); |
| 911 | free_irq(irq, NULL); |
| 912 | release_region(io, 8); |
| 913 | } |
| 914 | |
| 915 | |
| 916 | static int init_lirc_it87(void) |
| 917 | { |
| 918 | int retval; |
| 919 | |
| 920 | init_waitqueue_head(&lirc_read_queue); |
| 921 | retval = init_port(); |
| 922 | if (retval < 0) |
| 923 | return retval; |
| 924 | init_hardware(); |
| 925 | printk(KERN_INFO LIRC_DRIVER_NAME ": Installed.\n"); |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | static int it87_probe(struct pnp_dev *pnp_dev, |
| 930 | const struct pnp_device_id *dev_id) |
| 931 | { |
| 932 | int retval; |
| 933 | |
| 934 | driver.dev = &pnp_dev->dev; |
| 935 | |
| 936 | retval = init_chrdev(); |
| 937 | if (retval < 0) |
| 938 | return retval; |
| 939 | |
| 940 | retval = init_lirc_it87(); |
| 941 | if (retval) |
| 942 | goto init_lirc_it87_failed; |
| 943 | |
| 944 | return 0; |
| 945 | |
| 946 | init_lirc_it87_failed: |
| 947 | drop_chrdev(); |
| 948 | |
| 949 | return retval; |
| 950 | } |
| 951 | |
| 952 | static int __init lirc_it87_init(void) |
| 953 | { |
| 954 | return pnp_register_driver(&it87_pnp_driver); |
| 955 | } |
| 956 | |
| 957 | |
| 958 | static void __exit lirc_it87_exit(void) |
| 959 | { |
| 960 | drop_hardware(); |
| 961 | drop_chrdev(); |
| 962 | drop_port(); |
| 963 | pnp_unregister_driver(&it87_pnp_driver); |
| 964 | printk(KERN_INFO LIRC_DRIVER_NAME ": Uninstalled.\n"); |
| 965 | } |
| 966 | |
| 967 | /* SECTION: PNP for ITE8704/18 */ |
| 968 | |
| 969 | static const struct pnp_device_id pnp_dev_table[] = { |
| 970 | {"ITE8704", 0}, |
| 971 | {} |
| 972 | }; |
| 973 | |
| 974 | MODULE_DEVICE_TABLE(pnp, pnp_dev_table); |
| 975 | |
| 976 | static struct pnp_driver it87_pnp_driver = { |
| 977 | .name = LIRC_DRIVER_NAME, |
| 978 | .id_table = pnp_dev_table, |
| 979 | .probe = it87_probe, |
| 980 | }; |
| 981 | |
| 982 | module_init(lirc_it87_init); |
| 983 | module_exit(lirc_it87_exit); |
| 984 | |
| 985 | MODULE_DESCRIPTION("LIRC driver for ITE IT8704/05/12/18/20 CIR port"); |
| 986 | MODULE_AUTHOR("Hans-Gunter Lutke Uphues"); |
| 987 | MODULE_LICENSE("GPL"); |
| 988 | |
| 989 | module_param(io, int, S_IRUGO); |
| 990 | MODULE_PARM_DESC(io, "I/O base address (default: 0x310)"); |
| 991 | |
| 992 | module_param(irq, int, S_IRUGO); |
| 993 | #ifdef LIRC_IT87_DIGIMATRIX |
| 994 | MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 9)"); |
| 995 | #else |
| 996 | MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 7)"); |
| 997 | #endif |
| 998 | |
| 999 | module_param(it87_enable_demodulator, bool, S_IRUGO); |
| 1000 | MODULE_PARM_DESC(it87_enable_demodulator, |
| 1001 | "Receiver demodulator enable/disable (1/0), default: 0"); |
| 1002 | |
| 1003 | module_param(debug, bool, S_IRUGO | S_IWUSR); |
| 1004 | MODULE_PARM_DESC(debug, "Enable debugging messages"); |
| 1005 | |
| 1006 | module_param(digimatrix, bool, S_IRUGO | S_IWUSR); |
| 1007 | #ifdef LIRC_IT87_DIGIMATRIX |
| 1008 | MODULE_PARM_DESC(digimatrix, |
| 1009 | "Asus Digimatrix it87 compat. enable/disable (1/0), default: 1"); |
| 1010 | #else |
| 1011 | MODULE_PARM_DESC(digimatrix, |
| 1012 | "Asus Digimatrix it87 compat. enable/disable (1/0), default: 0"); |
| 1013 | #endif |
| 1014 | |
| 1015 | |
| 1016 | module_param(it87_freq, int, S_IRUGO); |
| 1017 | #ifdef LIRC_IT87_DIGIMATRIX |
| 1018 | MODULE_PARM_DESC(it87_freq, |
| 1019 | "Carrier demodulator frequency (kHz), (default: 36)"); |
| 1020 | #else |
| 1021 | MODULE_PARM_DESC(it87_freq, |
| 1022 | "Carrier demodulator frequency (kHz), (default: 38)"); |
| 1023 | #endif |