1 /* 2 * Driver for ITE Tech Inc. IT8712F/IT8512 CIR 3 * 4 * Copyright (C) 2010 Juan Jesús García de Soria <skandalfo@gmail.com> 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 * Inspired by the original lirc_it87 and lirc_ite8709 drivers, on top of the 22 * skeleton provided by the nuvoton-cir driver. 23 * 24 * The lirc_it87 driver was originally written by Hans-Gunter Lutke Uphues 25 * <hg_lu@web.de> in 2001, with enhancements by Christoph Bartelmus 26 * <lirc@bartelmus.de>, Andrew Calkin <r_tay@hotmail.com> and James Edwards 27 * <jimbo-lirc@edwardsclan.net>. 28 * 29 * The lirc_ite8709 driver was written by Grégory Lardière 30 * <spmf2004-lirc@yahoo.fr> in 2008. 31 */ 32 33 #include <linux/kernel.h> 34 #include <linux/module.h> 35 #include <linux/pnp.h> 36 #include <linux/io.h> 37 #include <linux/interrupt.h> 38 #include <linux/sched.h> 39 #include <linux/delay.h> 40 #include <linux/slab.h> 41 #include <linux/input.h> 42 #include <linux/bitops.h> 43 #include <media/rc-core.h> 44 #include <linux/pci_ids.h> 45 46 #include "ite-cir.h" 47 48 /* module parameters */ 49 50 /* debug level */ 51 static int debug; 52 module_param(debug, int, S_IRUGO | S_IWUSR); 53 MODULE_PARM_DESC(debug, "Enable debugging output"); 54 55 /* low limit for RX carrier freq, Hz, 0 for no RX demodulation */ 56 static int rx_low_carrier_freq; 57 module_param(rx_low_carrier_freq, int, S_IRUGO | S_IWUSR); 58 MODULE_PARM_DESC(rx_low_carrier_freq, "Override low RX carrier frequency, Hz, " 59 "0 for no RX demodulation"); 60 61 /* high limit for RX carrier freq, Hz, 0 for no RX demodulation */ 62 static int rx_high_carrier_freq; 63 module_param(rx_high_carrier_freq, int, S_IRUGO | S_IWUSR); 64 MODULE_PARM_DESC(rx_high_carrier_freq, "Override high RX carrier frequency, " 65 "Hz, 0 for no RX demodulation"); 66 67 /* override tx carrier frequency */ 68 static int tx_carrier_freq; 69 module_param(tx_carrier_freq, int, S_IRUGO | S_IWUSR); 70 MODULE_PARM_DESC(tx_carrier_freq, "Override TX carrier frequency, Hz"); 71 72 /* override tx duty cycle */ 73 static int tx_duty_cycle; 74 module_param(tx_duty_cycle, int, S_IRUGO | S_IWUSR); 75 MODULE_PARM_DESC(tx_duty_cycle, "Override TX duty cycle, 1-100"); 76 77 /* override default sample period */ 78 static long sample_period; 79 module_param(sample_period, long, S_IRUGO | S_IWUSR); 80 MODULE_PARM_DESC(sample_period, "Override carrier sample period, us"); 81 82 /* override detected model id */ 83 static int model_number = -1; 84 module_param(model_number, int, S_IRUGO | S_IWUSR); 85 MODULE_PARM_DESC(model_number, "Use this model number, don't autodetect"); 86 87 88 /* HW-independent code functions */ 89 90 /* check whether carrier frequency is high frequency */ 91 static inline bool ite_is_high_carrier_freq(unsigned int freq) 92 { 93 return freq >= ITE_HCF_MIN_CARRIER_FREQ; 94 } 95 96 /* get the bits required to program the carrier frequency in CFQ bits, 97 * unshifted */ 98 static u8 ite_get_carrier_freq_bits(unsigned int freq) 99 { 100 if (ite_is_high_carrier_freq(freq)) { 101 if (freq < 425000) 102 return ITE_CFQ_400; 103 104 else if (freq < 465000) 105 return ITE_CFQ_450; 106 107 else if (freq < 490000) 108 return ITE_CFQ_480; 109 110 else 111 return ITE_CFQ_500; 112 } else { 113 /* trim to limits */ 114 if (freq < ITE_LCF_MIN_CARRIER_FREQ) 115 freq = ITE_LCF_MIN_CARRIER_FREQ; 116 if (freq > ITE_LCF_MAX_CARRIER_FREQ) 117 freq = ITE_LCF_MAX_CARRIER_FREQ; 118 119 /* convert to kHz and subtract the base freq */ 120 freq = 121 DIV_ROUND_CLOSEST(freq - ITE_LCF_MIN_CARRIER_FREQ, 122 1000); 123 124 return (u8) freq; 125 } 126 } 127 128 /* get the bits required to program the pulse with in TXMPW */ 129 static u8 ite_get_pulse_width_bits(unsigned int freq, int duty_cycle) 130 { 131 unsigned long period_ns, on_ns; 132 133 /* sanitize freq into range */ 134 if (freq < ITE_LCF_MIN_CARRIER_FREQ) 135 freq = ITE_LCF_MIN_CARRIER_FREQ; 136 if (freq > ITE_HCF_MAX_CARRIER_FREQ) 137 freq = ITE_HCF_MAX_CARRIER_FREQ; 138 139 period_ns = 1000000000UL / freq; 140 on_ns = period_ns * duty_cycle / 100; 141 142 if (ite_is_high_carrier_freq(freq)) { 143 if (on_ns < 750) 144 return ITE_TXMPW_A; 145 146 else if (on_ns < 850) 147 return ITE_TXMPW_B; 148 149 else if (on_ns < 950) 150 return ITE_TXMPW_C; 151 152 else if (on_ns < 1080) 153 return ITE_TXMPW_D; 154 155 else 156 return ITE_TXMPW_E; 157 } else { 158 if (on_ns < 6500) 159 return ITE_TXMPW_A; 160 161 else if (on_ns < 7850) 162 return ITE_TXMPW_B; 163 164 else if (on_ns < 9650) 165 return ITE_TXMPW_C; 166 167 else if (on_ns < 11950) 168 return ITE_TXMPW_D; 169 170 else 171 return ITE_TXMPW_E; 172 } 173 } 174 175 /* decode raw bytes as received by the hardware, and push them to the ir-core 176 * layer */ 177 static void ite_decode_bytes(struct ite_dev *dev, const u8 * data, int 178 length) 179 { 180 u32 sample_period; 181 unsigned long *ldata; 182 unsigned int next_one, next_zero, size; 183 DEFINE_IR_RAW_EVENT(ev); 184 185 if (length == 0) 186 return; 187 188 sample_period = dev->params.sample_period; 189 ldata = (unsigned long *)data; 190 size = length << 3; 191 next_one = find_next_bit_le(ldata, size, 0); 192 if (next_one > 0) { 193 ev.pulse = true; 194 ev.duration = 195 ITE_BITS_TO_NS(next_one, sample_period); 196 ir_raw_event_store_with_filter(dev->rdev, &ev); 197 } 198 199 while (next_one < size) { 200 next_zero = find_next_zero_bit_le(ldata, size, next_one + 1); 201 ev.pulse = false; 202 ev.duration = ITE_BITS_TO_NS(next_zero - next_one, sample_period); 203 ir_raw_event_store_with_filter(dev->rdev, &ev); 204 205 if (next_zero < size) { 206 next_one = 207 find_next_bit_le(ldata, 208 size, 209 next_zero + 1); 210 ev.pulse = true; 211 ev.duration = 212 ITE_BITS_TO_NS(next_one - next_zero, 213 sample_period); 214 ir_raw_event_store_with_filter 215 (dev->rdev, &ev); 216 } else 217 next_one = size; 218 } 219 220 ir_raw_event_handle(dev->rdev); 221 222 ite_dbg_verbose("decoded %d bytes.", length); 223 } 224 225 /* set all the rx/tx carrier parameters; this must be called with the device 226 * spinlock held */ 227 static void ite_set_carrier_params(struct ite_dev *dev) 228 { 229 unsigned int freq, low_freq, high_freq; 230 int allowance; 231 bool use_demodulator; 232 bool for_tx = dev->transmitting; 233 234 ite_dbg("%s called", __func__); 235 236 if (for_tx) { 237 /* we don't need no stinking calculations */ 238 freq = dev->params.tx_carrier_freq; 239 allowance = ITE_RXDCR_DEFAULT; 240 use_demodulator = false; 241 } else { 242 low_freq = dev->params.rx_low_carrier_freq; 243 high_freq = dev->params.rx_high_carrier_freq; 244 245 if (low_freq == 0) { 246 /* don't demodulate */ 247 freq = 248 ITE_DEFAULT_CARRIER_FREQ; 249 allowance = ITE_RXDCR_DEFAULT; 250 use_demodulator = false; 251 } else { 252 /* calculate the middle freq */ 253 freq = (low_freq + high_freq) / 2; 254 255 /* calculate the allowance */ 256 allowance = 257 DIV_ROUND_CLOSEST(10000 * (high_freq - low_freq), 258 ITE_RXDCR_PER_10000_STEP 259 * (high_freq + low_freq)); 260 261 if (allowance < 1) 262 allowance = 1; 263 264 if (allowance > ITE_RXDCR_MAX) 265 allowance = ITE_RXDCR_MAX; 266 } 267 } 268 269 /* set the carrier parameters in a device-dependent way */ 270 dev->params.set_carrier_params(dev, ite_is_high_carrier_freq(freq), 271 use_demodulator, ite_get_carrier_freq_bits(freq), allowance, 272 ite_get_pulse_width_bits(freq, dev->params.tx_duty_cycle)); 273 } 274 275 /* interrupt service routine for incoming and outgoing CIR data */ 276 static irqreturn_t ite_cir_isr(int irq, void *data) 277 { 278 struct ite_dev *dev = data; 279 unsigned long flags; 280 irqreturn_t ret = IRQ_RETVAL(IRQ_NONE); 281 u8 rx_buf[ITE_RX_FIFO_LEN]; 282 int rx_bytes; 283 int iflags; 284 285 ite_dbg_verbose("%s firing", __func__); 286 287 /* grab the spinlock */ 288 spin_lock_irqsave(&dev->lock, flags); 289 290 /* read the interrupt flags */ 291 iflags = dev->params.get_irq_causes(dev); 292 293 /* check for the receive interrupt */ 294 if (iflags & (ITE_IRQ_RX_FIFO | ITE_IRQ_RX_FIFO_OVERRUN)) { 295 /* read the FIFO bytes */ 296 rx_bytes = 297 dev->params.get_rx_bytes(dev, rx_buf, 298 ITE_RX_FIFO_LEN); 299 300 if (rx_bytes > 0) { 301 /* drop the spinlock, since the ir-core layer 302 * may call us back again through 303 * ite_s_idle() */ 304 spin_unlock_irqrestore(&dev-> 305 lock, 306 flags); 307 308 /* decode the data we've just received */ 309 ite_decode_bytes(dev, rx_buf, 310 rx_bytes); 311 312 /* reacquire the spinlock */ 313 spin_lock_irqsave(&dev->lock, 314 flags); 315 316 /* mark the interrupt as serviced */ 317 ret = IRQ_RETVAL(IRQ_HANDLED); 318 } 319 } else if (iflags & ITE_IRQ_TX_FIFO) { 320 /* FIFO space available interrupt */ 321 ite_dbg_verbose("got interrupt for TX FIFO"); 322 323 /* wake any sleeping transmitter */ 324 wake_up_interruptible(&dev->tx_queue); 325 326 /* mark the interrupt as serviced */ 327 ret = IRQ_RETVAL(IRQ_HANDLED); 328 } 329 330 /* drop the spinlock */ 331 spin_unlock_irqrestore(&dev->lock, flags); 332 333 ite_dbg_verbose("%s done returning %d", __func__, (int)ret); 334 335 return ret; 336 } 337 338 /* set the rx carrier freq range, guess it's in Hz... */ 339 static int ite_set_rx_carrier_range(struct rc_dev *rcdev, u32 carrier_low, u32 340 carrier_high) 341 { 342 unsigned long flags; 343 struct ite_dev *dev = rcdev->priv; 344 345 spin_lock_irqsave(&dev->lock, flags); 346 dev->params.rx_low_carrier_freq = carrier_low; 347 dev->params.rx_high_carrier_freq = carrier_high; 348 ite_set_carrier_params(dev); 349 spin_unlock_irqrestore(&dev->lock, flags); 350 351 return 0; 352 } 353 354 /* set the tx carrier freq, guess it's in Hz... */ 355 static int ite_set_tx_carrier(struct rc_dev *rcdev, u32 carrier) 356 { 357 unsigned long flags; 358 struct ite_dev *dev = rcdev->priv; 359 360 spin_lock_irqsave(&dev->lock, flags); 361 dev->params.tx_carrier_freq = carrier; 362 ite_set_carrier_params(dev); 363 spin_unlock_irqrestore(&dev->lock, flags); 364 365 return 0; 366 } 367 368 /* set the tx duty cycle by controlling the pulse width */ 369 static int ite_set_tx_duty_cycle(struct rc_dev *rcdev, u32 duty_cycle) 370 { 371 unsigned long flags; 372 struct ite_dev *dev = rcdev->priv; 373 374 spin_lock_irqsave(&dev->lock, flags); 375 dev->params.tx_duty_cycle = duty_cycle; 376 ite_set_carrier_params(dev); 377 spin_unlock_irqrestore(&dev->lock, flags); 378 379 return 0; 380 } 381 382 /* transmit out IR pulses; what you get here is a batch of alternating 383 * pulse/space/pulse/space lengths that we should write out completely through 384 * the FIFO, blocking on a full FIFO */ 385 static int ite_tx_ir(struct rc_dev *rcdev, unsigned *txbuf, unsigned n) 386 { 387 unsigned long flags; 388 struct ite_dev *dev = rcdev->priv; 389 bool is_pulse = false; 390 int remaining_us, fifo_avail, fifo_remaining, last_idx = 0; 391 int max_rle_us, next_rle_us; 392 int ret = n; 393 u8 last_sent[ITE_TX_FIFO_LEN]; 394 u8 val; 395 396 ite_dbg("%s called", __func__); 397 398 /* clear the array just in case */ 399 memset(last_sent, 0, ARRAY_SIZE(last_sent)); 400 401 spin_lock_irqsave(&dev->lock, flags); 402 403 /* let everybody know we're now transmitting */ 404 dev->transmitting = true; 405 406 /* and set the carrier values for transmission */ 407 ite_set_carrier_params(dev); 408 409 /* calculate how much time we can send in one byte */ 410 max_rle_us = 411 (ITE_BAUDRATE_DIVISOR * dev->params.sample_period * 412 ITE_TX_MAX_RLE) / 1000; 413 414 /* disable the receiver */ 415 dev->params.disable_rx(dev); 416 417 /* this is where we'll begin filling in the FIFO, until it's full. 418 * then we'll just activate the interrupt, wait for it to wake us up 419 * again, disable it, continue filling the FIFO... until everything 420 * has been pushed out */ 421 fifo_avail = 422 ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev); 423 424 while (n > 0 && dev->in_use) { 425 /* transmit the next sample */ 426 is_pulse = !is_pulse; 427 remaining_us = *(txbuf++); 428 n--; 429 430 ite_dbg("%s: %ld", 431 ((is_pulse) ? "pulse" : "space"), 432 (long int) 433 remaining_us); 434 435 /* repeat while the pulse is non-zero length */ 436 while (remaining_us > 0 && dev->in_use) { 437 if (remaining_us > max_rle_us) 438 next_rle_us = max_rle_us; 439 440 else 441 next_rle_us = remaining_us; 442 443 remaining_us -= next_rle_us; 444 445 /* check what's the length we have to pump out */ 446 val = (ITE_TX_MAX_RLE * next_rle_us) / max_rle_us; 447 448 /* put it into the sent buffer */ 449 last_sent[last_idx++] = val; 450 last_idx &= (ITE_TX_FIFO_LEN); 451 452 /* encode it for 7 bits */ 453 val = (val - 1) & ITE_TX_RLE_MASK; 454 455 /* take into account pulse/space prefix */ 456 if (is_pulse) 457 val |= ITE_TX_PULSE; 458 459 else 460 val |= ITE_TX_SPACE; 461 462 /* 463 * if we get to 0 available, read again, just in case 464 * some other slot got freed 465 */ 466 if (fifo_avail <= 0) 467 fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev); 468 469 /* if it's still full */ 470 if (fifo_avail <= 0) { 471 /* enable the tx interrupt */ 472 dev->params. 473 enable_tx_interrupt(dev); 474 475 /* drop the spinlock */ 476 spin_unlock_irqrestore(&dev->lock, flags); 477 478 /* wait for the FIFO to empty enough */ 479 wait_event_interruptible(dev->tx_queue, (fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev)) >= 8); 480 481 /* get the spinlock again */ 482 spin_lock_irqsave(&dev->lock, flags); 483 484 /* disable the tx interrupt again. */ 485 dev->params. 486 disable_tx_interrupt(dev); 487 } 488 489 /* now send the byte through the FIFO */ 490 dev->params.put_tx_byte(dev, val); 491 fifo_avail--; 492 } 493 } 494 495 /* wait and don't return until the whole FIFO has been sent out; 496 * otherwise we could configure the RX carrier params instead of the 497 * TX ones while the transmission is still being performed! */ 498 fifo_remaining = dev->params.get_tx_used_slots(dev); 499 remaining_us = 0; 500 while (fifo_remaining > 0) { 501 fifo_remaining--; 502 last_idx--; 503 last_idx &= (ITE_TX_FIFO_LEN - 1); 504 remaining_us += last_sent[last_idx]; 505 } 506 remaining_us = (remaining_us * max_rle_us) / (ITE_TX_MAX_RLE); 507 508 /* drop the spinlock while we sleep */ 509 spin_unlock_irqrestore(&dev->lock, flags); 510 511 /* sleep remaining_us microseconds */ 512 mdelay(DIV_ROUND_UP(remaining_us, 1000)); 513 514 /* reacquire the spinlock */ 515 spin_lock_irqsave(&dev->lock, flags); 516 517 /* now we're not transmitting anymore */ 518 dev->transmitting = false; 519 520 /* and set the carrier values for reception */ 521 ite_set_carrier_params(dev); 522 523 /* reenable the receiver */ 524 if (dev->in_use) 525 dev->params.enable_rx(dev); 526 527 /* notify transmission end */ 528 wake_up_interruptible(&dev->tx_ended); 529 530 spin_unlock_irqrestore(&dev->lock, flags); 531 532 return ret; 533 } 534 535 /* idle the receiver if needed */ 536 static void ite_s_idle(struct rc_dev *rcdev, bool enable) 537 { 538 unsigned long flags; 539 struct ite_dev *dev = rcdev->priv; 540 541 ite_dbg("%s called", __func__); 542 543 if (enable) { 544 spin_lock_irqsave(&dev->lock, flags); 545 dev->params.idle_rx(dev); 546 spin_unlock_irqrestore(&dev->lock, flags); 547 } 548 } 549 550 551 /* IT8712F HW-specific functions */ 552 553 /* retrieve a bitmask of the current causes for a pending interrupt; this may 554 * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN 555 * */ 556 static int it87_get_irq_causes(struct ite_dev *dev) 557 { 558 u8 iflags; 559 int ret = 0; 560 561 ite_dbg("%s called", __func__); 562 563 /* read the interrupt flags */ 564 iflags = inb(dev->cir_addr + IT87_IIR) & IT87_II; 565 566 switch (iflags) { 567 case IT87_II_RXDS: 568 ret = ITE_IRQ_RX_FIFO; 569 break; 570 case IT87_II_RXFO: 571 ret = ITE_IRQ_RX_FIFO_OVERRUN; 572 break; 573 case IT87_II_TXLDL: 574 ret = ITE_IRQ_TX_FIFO; 575 break; 576 } 577 578 return ret; 579 } 580 581 /* set the carrier parameters; to be called with the spinlock held */ 582 static void it87_set_carrier_params(struct ite_dev *dev, bool high_freq, 583 bool use_demodulator, 584 u8 carrier_freq_bits, u8 allowance_bits, 585 u8 pulse_width_bits) 586 { 587 u8 val; 588 589 ite_dbg("%s called", __func__); 590 591 /* program the RCR register */ 592 val = inb(dev->cir_addr + IT87_RCR) 593 & ~(IT87_HCFS | IT87_RXEND | IT87_RXDCR); 594 595 if (high_freq) 596 val |= IT87_HCFS; 597 598 if (use_demodulator) 599 val |= IT87_RXEND; 600 601 val |= allowance_bits; 602 603 outb(val, dev->cir_addr + IT87_RCR); 604 605 /* program the TCR2 register */ 606 outb((carrier_freq_bits << IT87_CFQ_SHIFT) | pulse_width_bits, 607 dev->cir_addr + IT87_TCR2); 608 } 609 610 /* read up to buf_size bytes from the RX FIFO; to be called with the spinlock 611 * held */ 612 static int it87_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size) 613 { 614 int fifo, read = 0; 615 616 ite_dbg("%s called", __func__); 617 618 /* read how many bytes are still in the FIFO */ 619 fifo = inb(dev->cir_addr + IT87_RSR) & IT87_RXFBC; 620 621 while (fifo > 0 && buf_size > 0) { 622 *(buf++) = inb(dev->cir_addr + IT87_DR); 623 fifo--; 624 read++; 625 buf_size--; 626 } 627 628 return read; 629 } 630 631 /* return how many bytes are still in the FIFO; this will be called 632 * with the device spinlock NOT HELD while waiting for the TX FIFO to get 633 * empty; let's expect this won't be a problem */ 634 static int it87_get_tx_used_slots(struct ite_dev *dev) 635 { 636 ite_dbg("%s called", __func__); 637 638 return inb(dev->cir_addr + IT87_TSR) & IT87_TXFBC; 639 } 640 641 /* put a byte to the TX fifo; this should be called with the spinlock held */ 642 static void it87_put_tx_byte(struct ite_dev *dev, u8 value) 643 { 644 outb(value, dev->cir_addr + IT87_DR); 645 } 646 647 /* idle the receiver so that we won't receive samples until another 648 pulse is detected; this must be called with the device spinlock held */ 649 static void it87_idle_rx(struct ite_dev *dev) 650 { 651 ite_dbg("%s called", __func__); 652 653 /* disable streaming by clearing RXACT writing it as 1 */ 654 outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXACT, 655 dev->cir_addr + IT87_RCR); 656 657 /* clear the FIFO */ 658 outb(inb(dev->cir_addr + IT87_TCR1) | IT87_FIFOCLR, 659 dev->cir_addr + IT87_TCR1); 660 } 661 662 /* disable the receiver; this must be called with the device spinlock held */ 663 static void it87_disable_rx(struct ite_dev *dev) 664 { 665 ite_dbg("%s called", __func__); 666 667 /* disable the receiver interrupts */ 668 outb(inb(dev->cir_addr + IT87_IER) & ~(IT87_RDAIE | IT87_RFOIE), 669 dev->cir_addr + IT87_IER); 670 671 /* disable the receiver */ 672 outb(inb(dev->cir_addr + IT87_RCR) & ~IT87_RXEN, 673 dev->cir_addr + IT87_RCR); 674 675 /* clear the FIFO and RXACT (actually RXACT should have been cleared 676 * in the previous outb() call) */ 677 it87_idle_rx(dev); 678 } 679 680 /* enable the receiver; this must be called with the device spinlock held */ 681 static void it87_enable_rx(struct ite_dev *dev) 682 { 683 ite_dbg("%s called", __func__); 684 685 /* enable the receiver by setting RXEN */ 686 outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXEN, 687 dev->cir_addr + IT87_RCR); 688 689 /* just prepare it to idle for the next reception */ 690 it87_idle_rx(dev); 691 692 /* enable the receiver interrupts and master enable flag */ 693 outb(inb(dev->cir_addr + IT87_IER) | IT87_RDAIE | IT87_RFOIE | IT87_IEC, 694 dev->cir_addr + IT87_IER); 695 } 696 697 /* disable the transmitter interrupt; this must be called with the device 698 * spinlock held */ 699 static void it87_disable_tx_interrupt(struct ite_dev *dev) 700 { 701 ite_dbg("%s called", __func__); 702 703 /* disable the transmitter interrupts */ 704 outb(inb(dev->cir_addr + IT87_IER) & ~IT87_TLDLIE, 705 dev->cir_addr + IT87_IER); 706 } 707 708 /* enable the transmitter interrupt; this must be called with the device 709 * spinlock held */ 710 static void it87_enable_tx_interrupt(struct ite_dev *dev) 711 { 712 ite_dbg("%s called", __func__); 713 714 /* enable the transmitter interrupts and master enable flag */ 715 outb(inb(dev->cir_addr + IT87_IER) | IT87_TLDLIE | IT87_IEC, 716 dev->cir_addr + IT87_IER); 717 } 718 719 /* disable the device; this must be called with the device spinlock held */ 720 static void it87_disable(struct ite_dev *dev) 721 { 722 ite_dbg("%s called", __func__); 723 724 /* clear out all interrupt enable flags */ 725 outb(inb(dev->cir_addr + IT87_IER) & 726 ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE), 727 dev->cir_addr + IT87_IER); 728 729 /* disable the receiver */ 730 it87_disable_rx(dev); 731 732 /* erase the FIFO */ 733 outb(IT87_FIFOCLR | inb(dev->cir_addr + IT87_TCR1), 734 dev->cir_addr + IT87_TCR1); 735 } 736 737 /* initialize the hardware */ 738 static void it87_init_hardware(struct ite_dev *dev) 739 { 740 ite_dbg("%s called", __func__); 741 742 /* enable just the baud rate divisor register, 743 disabling all the interrupts at the same time */ 744 outb((inb(dev->cir_addr + IT87_IER) & 745 ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE)) | IT87_BR, 746 dev->cir_addr + IT87_IER); 747 748 /* write out the baud rate divisor */ 749 outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT87_BDLR); 750 outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff, dev->cir_addr + IT87_BDHR); 751 752 /* disable the baud rate divisor register again */ 753 outb(inb(dev->cir_addr + IT87_IER) & ~IT87_BR, 754 dev->cir_addr + IT87_IER); 755 756 /* program the RCR register defaults */ 757 outb(ITE_RXDCR_DEFAULT, dev->cir_addr + IT87_RCR); 758 759 /* program the TCR1 register */ 760 outb(IT87_TXMPM_DEFAULT | IT87_TXENDF | IT87_TXRLE 761 | IT87_FIFOTL_DEFAULT | IT87_FIFOCLR, 762 dev->cir_addr + IT87_TCR1); 763 764 /* program the carrier parameters */ 765 ite_set_carrier_params(dev); 766 } 767 768 /* IT8512F on ITE8708 HW-specific functions */ 769 770 /* retrieve a bitmask of the current causes for a pending interrupt; this may 771 * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN 772 * */ 773 static int it8708_get_irq_causes(struct ite_dev *dev) 774 { 775 u8 iflags; 776 int ret = 0; 777 778 ite_dbg("%s called", __func__); 779 780 /* read the interrupt flags */ 781 iflags = inb(dev->cir_addr + IT8708_C0IIR); 782 783 if (iflags & IT85_TLDLI) 784 ret |= ITE_IRQ_TX_FIFO; 785 if (iflags & IT85_RDAI) 786 ret |= ITE_IRQ_RX_FIFO; 787 if (iflags & IT85_RFOI) 788 ret |= ITE_IRQ_RX_FIFO_OVERRUN; 789 790 return ret; 791 } 792 793 /* set the carrier parameters; to be called with the spinlock held */ 794 static void it8708_set_carrier_params(struct ite_dev *dev, bool high_freq, 795 bool use_demodulator, 796 u8 carrier_freq_bits, u8 allowance_bits, 797 u8 pulse_width_bits) 798 { 799 u8 val; 800 801 ite_dbg("%s called", __func__); 802 803 /* program the C0CFR register, with HRAE=1 */ 804 outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE, 805 dev->cir_addr + IT8708_BANKSEL); 806 807 val = (inb(dev->cir_addr + IT8708_C0CFR) 808 & ~(IT85_HCFS | IT85_CFQ)) | carrier_freq_bits; 809 810 if (high_freq) 811 val |= IT85_HCFS; 812 813 outb(val, dev->cir_addr + IT8708_C0CFR); 814 815 outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE, 816 dev->cir_addr + IT8708_BANKSEL); 817 818 /* program the C0RCR register */ 819 val = inb(dev->cir_addr + IT8708_C0RCR) 820 & ~(IT85_RXEND | IT85_RXDCR); 821 822 if (use_demodulator) 823 val |= IT85_RXEND; 824 825 val |= allowance_bits; 826 827 outb(val, dev->cir_addr + IT8708_C0RCR); 828 829 /* program the C0TCR register */ 830 val = inb(dev->cir_addr + IT8708_C0TCR) & ~IT85_TXMPW; 831 val |= pulse_width_bits; 832 outb(val, dev->cir_addr + IT8708_C0TCR); 833 } 834 835 /* read up to buf_size bytes from the RX FIFO; to be called with the spinlock 836 * held */ 837 static int it8708_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size) 838 { 839 int fifo, read = 0; 840 841 ite_dbg("%s called", __func__); 842 843 /* read how many bytes are still in the FIFO */ 844 fifo = inb(dev->cir_addr + IT8708_C0RFSR) & IT85_RXFBC; 845 846 while (fifo > 0 && buf_size > 0) { 847 *(buf++) = inb(dev->cir_addr + IT8708_C0DR); 848 fifo--; 849 read++; 850 buf_size--; 851 } 852 853 return read; 854 } 855 856 /* return how many bytes are still in the FIFO; this will be called 857 * with the device spinlock NOT HELD while waiting for the TX FIFO to get 858 * empty; let's expect this won't be a problem */ 859 static int it8708_get_tx_used_slots(struct ite_dev *dev) 860 { 861 ite_dbg("%s called", __func__); 862 863 return inb(dev->cir_addr + IT8708_C0TFSR) & IT85_TXFBC; 864 } 865 866 /* put a byte to the TX fifo; this should be called with the spinlock held */ 867 static void it8708_put_tx_byte(struct ite_dev *dev, u8 value) 868 { 869 outb(value, dev->cir_addr + IT8708_C0DR); 870 } 871 872 /* idle the receiver so that we won't receive samples until another 873 pulse is detected; this must be called with the device spinlock held */ 874 static void it8708_idle_rx(struct ite_dev *dev) 875 { 876 ite_dbg("%s called", __func__); 877 878 /* disable streaming by clearing RXACT writing it as 1 */ 879 outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXACT, 880 dev->cir_addr + IT8708_C0RCR); 881 882 /* clear the FIFO */ 883 outb(inb(dev->cir_addr + IT8708_C0MSTCR) | IT85_FIFOCLR, 884 dev->cir_addr + IT8708_C0MSTCR); 885 } 886 887 /* disable the receiver; this must be called with the device spinlock held */ 888 static void it8708_disable_rx(struct ite_dev *dev) 889 { 890 ite_dbg("%s called", __func__); 891 892 /* disable the receiver interrupts */ 893 outb(inb(dev->cir_addr + IT8708_C0IER) & 894 ~(IT85_RDAIE | IT85_RFOIE), 895 dev->cir_addr + IT8708_C0IER); 896 897 /* disable the receiver */ 898 outb(inb(dev->cir_addr + IT8708_C0RCR) & ~IT85_RXEN, 899 dev->cir_addr + IT8708_C0RCR); 900 901 /* clear the FIFO and RXACT (actually RXACT should have been cleared 902 * in the previous outb() call) */ 903 it8708_idle_rx(dev); 904 } 905 906 /* enable the receiver; this must be called with the device spinlock held */ 907 static void it8708_enable_rx(struct ite_dev *dev) 908 { 909 ite_dbg("%s called", __func__); 910 911 /* enable the receiver by setting RXEN */ 912 outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXEN, 913 dev->cir_addr + IT8708_C0RCR); 914 915 /* just prepare it to idle for the next reception */ 916 it8708_idle_rx(dev); 917 918 /* enable the receiver interrupts and master enable flag */ 919 outb(inb(dev->cir_addr + IT8708_C0IER) 920 |IT85_RDAIE | IT85_RFOIE | IT85_IEC, 921 dev->cir_addr + IT8708_C0IER); 922 } 923 924 /* disable the transmitter interrupt; this must be called with the device 925 * spinlock held */ 926 static void it8708_disable_tx_interrupt(struct ite_dev *dev) 927 { 928 ite_dbg("%s called", __func__); 929 930 /* disable the transmitter interrupts */ 931 outb(inb(dev->cir_addr + IT8708_C0IER) & ~IT85_TLDLIE, 932 dev->cir_addr + IT8708_C0IER); 933 } 934 935 /* enable the transmitter interrupt; this must be called with the device 936 * spinlock held */ 937 static void it8708_enable_tx_interrupt(struct ite_dev *dev) 938 { 939 ite_dbg("%s called", __func__); 940 941 /* enable the transmitter interrupts and master enable flag */ 942 outb(inb(dev->cir_addr + IT8708_C0IER) 943 |IT85_TLDLIE | IT85_IEC, 944 dev->cir_addr + IT8708_C0IER); 945 } 946 947 /* disable the device; this must be called with the device spinlock held */ 948 static void it8708_disable(struct ite_dev *dev) 949 { 950 ite_dbg("%s called", __func__); 951 952 /* clear out all interrupt enable flags */ 953 outb(inb(dev->cir_addr + IT8708_C0IER) & 954 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE), 955 dev->cir_addr + IT8708_C0IER); 956 957 /* disable the receiver */ 958 it8708_disable_rx(dev); 959 960 /* erase the FIFO */ 961 outb(IT85_FIFOCLR | inb(dev->cir_addr + IT8708_C0MSTCR), 962 dev->cir_addr + IT8708_C0MSTCR); 963 } 964 965 /* initialize the hardware */ 966 static void it8708_init_hardware(struct ite_dev *dev) 967 { 968 ite_dbg("%s called", __func__); 969 970 /* disable all the interrupts */ 971 outb(inb(dev->cir_addr + IT8708_C0IER) & 972 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE), 973 dev->cir_addr + IT8708_C0IER); 974 975 /* program the baud rate divisor */ 976 outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE, 977 dev->cir_addr + IT8708_BANKSEL); 978 979 outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT8708_C0BDLR); 980 outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff, 981 dev->cir_addr + IT8708_C0BDHR); 982 983 outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE, 984 dev->cir_addr + IT8708_BANKSEL); 985 986 /* program the C0MSTCR register defaults */ 987 outb((inb(dev->cir_addr + IT8708_C0MSTCR) & 988 ~(IT85_ILSEL | IT85_ILE | IT85_FIFOTL | 989 IT85_FIFOCLR | IT85_RESET)) | 990 IT85_FIFOTL_DEFAULT, 991 dev->cir_addr + IT8708_C0MSTCR); 992 993 /* program the C0RCR register defaults */ 994 outb((inb(dev->cir_addr + IT8708_C0RCR) & 995 ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND | 996 IT85_RXACT | IT85_RXDCR)) | 997 ITE_RXDCR_DEFAULT, 998 dev->cir_addr + IT8708_C0RCR); 999 1000 /* program the C0TCR register defaults */ 1001 outb((inb(dev->cir_addr + IT8708_C0TCR) & 1002 ~(IT85_TXMPM | IT85_TXMPW)) 1003 |IT85_TXRLE | IT85_TXENDF | 1004 IT85_TXMPM_DEFAULT | IT85_TXMPW_DEFAULT, 1005 dev->cir_addr + IT8708_C0TCR); 1006 1007 /* program the carrier parameters */ 1008 ite_set_carrier_params(dev); 1009 } 1010 1011 /* IT8512F on ITE8709 HW-specific functions */ 1012 1013 /* read a byte from the SRAM module */ 1014 static inline u8 it8709_rm(struct ite_dev *dev, int index) 1015 { 1016 outb(index, dev->cir_addr + IT8709_RAM_IDX); 1017 return inb(dev->cir_addr + IT8709_RAM_VAL); 1018 } 1019 1020 /* write a byte to the SRAM module */ 1021 static inline void it8709_wm(struct ite_dev *dev, u8 val, int index) 1022 { 1023 outb(index, dev->cir_addr + IT8709_RAM_IDX); 1024 outb(val, dev->cir_addr + IT8709_RAM_VAL); 1025 } 1026 1027 static void it8709_wait(struct ite_dev *dev) 1028 { 1029 int i = 0; 1030 /* 1031 * loop until device tells it's ready to continue 1032 * iterations count is usually ~750 but can sometimes achieve 13000 1033 */ 1034 for (i = 0; i < 15000; i++) { 1035 udelay(2); 1036 if (it8709_rm(dev, IT8709_MODE) == IT8709_IDLE) 1037 break; 1038 } 1039 } 1040 1041 /* read the value of a CIR register */ 1042 static u8 it8709_rr(struct ite_dev *dev, int index) 1043 { 1044 /* just wait in case the previous access was a write */ 1045 it8709_wait(dev); 1046 it8709_wm(dev, index, IT8709_REG_IDX); 1047 it8709_wm(dev, IT8709_READ, IT8709_MODE); 1048 1049 /* wait for the read data to be available */ 1050 it8709_wait(dev); 1051 1052 /* return the read value */ 1053 return it8709_rm(dev, IT8709_REG_VAL); 1054 } 1055 1056 /* write the value of a CIR register */ 1057 static void it8709_wr(struct ite_dev *dev, u8 val, int index) 1058 { 1059 /* we wait before writing, and not afterwards, since this allows us to 1060 * pipeline the host CPU with the microcontroller */ 1061 it8709_wait(dev); 1062 it8709_wm(dev, val, IT8709_REG_VAL); 1063 it8709_wm(dev, index, IT8709_REG_IDX); 1064 it8709_wm(dev, IT8709_WRITE, IT8709_MODE); 1065 } 1066 1067 /* retrieve a bitmask of the current causes for a pending interrupt; this may 1068 * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN 1069 * */ 1070 static int it8709_get_irq_causes(struct ite_dev *dev) 1071 { 1072 u8 iflags; 1073 int ret = 0; 1074 1075 ite_dbg("%s called", __func__); 1076 1077 /* read the interrupt flags */ 1078 iflags = it8709_rm(dev, IT8709_IIR); 1079 1080 if (iflags & IT85_TLDLI) 1081 ret |= ITE_IRQ_TX_FIFO; 1082 if (iflags & IT85_RDAI) 1083 ret |= ITE_IRQ_RX_FIFO; 1084 if (iflags & IT85_RFOI) 1085 ret |= ITE_IRQ_RX_FIFO_OVERRUN; 1086 1087 return ret; 1088 } 1089 1090 /* set the carrier parameters; to be called with the spinlock held */ 1091 static void it8709_set_carrier_params(struct ite_dev *dev, bool high_freq, 1092 bool use_demodulator, 1093 u8 carrier_freq_bits, u8 allowance_bits, 1094 u8 pulse_width_bits) 1095 { 1096 u8 val; 1097 1098 ite_dbg("%s called", __func__); 1099 1100 val = (it8709_rr(dev, IT85_C0CFR) 1101 &~(IT85_HCFS | IT85_CFQ)) | 1102 carrier_freq_bits; 1103 1104 if (high_freq) 1105 val |= IT85_HCFS; 1106 1107 it8709_wr(dev, val, IT85_C0CFR); 1108 1109 /* program the C0RCR register */ 1110 val = it8709_rr(dev, IT85_C0RCR) 1111 & ~(IT85_RXEND | IT85_RXDCR); 1112 1113 if (use_demodulator) 1114 val |= IT85_RXEND; 1115 1116 val |= allowance_bits; 1117 1118 it8709_wr(dev, val, IT85_C0RCR); 1119 1120 /* program the C0TCR register */ 1121 val = it8709_rr(dev, IT85_C0TCR) & ~IT85_TXMPW; 1122 val |= pulse_width_bits; 1123 it8709_wr(dev, val, IT85_C0TCR); 1124 } 1125 1126 /* read up to buf_size bytes from the RX FIFO; to be called with the spinlock 1127 * held */ 1128 static int it8709_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size) 1129 { 1130 int fifo, read = 0; 1131 1132 ite_dbg("%s called", __func__); 1133 1134 /* read how many bytes are still in the FIFO */ 1135 fifo = it8709_rm(dev, IT8709_RFSR) & IT85_RXFBC; 1136 1137 while (fifo > 0 && buf_size > 0) { 1138 *(buf++) = it8709_rm(dev, IT8709_FIFO + read); 1139 fifo--; 1140 read++; 1141 buf_size--; 1142 } 1143 1144 /* 'clear' the FIFO by setting the writing index to 0; this is 1145 * completely bound to be racy, but we can't help it, since it's a 1146 * limitation of the protocol */ 1147 it8709_wm(dev, 0, IT8709_RFSR); 1148 1149 return read; 1150 } 1151 1152 /* return how many bytes are still in the FIFO; this will be called 1153 * with the device spinlock NOT HELD while waiting for the TX FIFO to get 1154 * empty; let's expect this won't be a problem */ 1155 static int it8709_get_tx_used_slots(struct ite_dev *dev) 1156 { 1157 ite_dbg("%s called", __func__); 1158 1159 return it8709_rr(dev, IT85_C0TFSR) & IT85_TXFBC; 1160 } 1161 1162 /* put a byte to the TX fifo; this should be called with the spinlock held */ 1163 static void it8709_put_tx_byte(struct ite_dev *dev, u8 value) 1164 { 1165 it8709_wr(dev, value, IT85_C0DR); 1166 } 1167 1168 /* idle the receiver so that we won't receive samples until another 1169 pulse is detected; this must be called with the device spinlock held */ 1170 static void it8709_idle_rx(struct ite_dev *dev) 1171 { 1172 ite_dbg("%s called", __func__); 1173 1174 /* disable streaming by clearing RXACT writing it as 1 */ 1175 it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXACT, 1176 IT85_C0RCR); 1177 1178 /* clear the FIFO */ 1179 it8709_wr(dev, it8709_rr(dev, IT85_C0MSTCR) | IT85_FIFOCLR, 1180 IT85_C0MSTCR); 1181 } 1182 1183 /* disable the receiver; this must be called with the device spinlock held */ 1184 static void it8709_disable_rx(struct ite_dev *dev) 1185 { 1186 ite_dbg("%s called", __func__); 1187 1188 /* disable the receiver interrupts */ 1189 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & 1190 ~(IT85_RDAIE | IT85_RFOIE), 1191 IT85_C0IER); 1192 1193 /* disable the receiver */ 1194 it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) & ~IT85_RXEN, 1195 IT85_C0RCR); 1196 1197 /* clear the FIFO and RXACT (actually RXACT should have been cleared 1198 * in the previous it8709_wr(dev, ) call) */ 1199 it8709_idle_rx(dev); 1200 } 1201 1202 /* enable the receiver; this must be called with the device spinlock held */ 1203 static void it8709_enable_rx(struct ite_dev *dev) 1204 { 1205 ite_dbg("%s called", __func__); 1206 1207 /* enable the receiver by setting RXEN */ 1208 it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXEN, 1209 IT85_C0RCR); 1210 1211 /* just prepare it to idle for the next reception */ 1212 it8709_idle_rx(dev); 1213 1214 /* enable the receiver interrupts and master enable flag */ 1215 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) 1216 |IT85_RDAIE | IT85_RFOIE | IT85_IEC, 1217 IT85_C0IER); 1218 } 1219 1220 /* disable the transmitter interrupt; this must be called with the device 1221 * spinlock held */ 1222 static void it8709_disable_tx_interrupt(struct ite_dev *dev) 1223 { 1224 ite_dbg("%s called", __func__); 1225 1226 /* disable the transmitter interrupts */ 1227 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & ~IT85_TLDLIE, 1228 IT85_C0IER); 1229 } 1230 1231 /* enable the transmitter interrupt; this must be called with the device 1232 * spinlock held */ 1233 static void it8709_enable_tx_interrupt(struct ite_dev *dev) 1234 { 1235 ite_dbg("%s called", __func__); 1236 1237 /* enable the transmitter interrupts and master enable flag */ 1238 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) 1239 |IT85_TLDLIE | IT85_IEC, 1240 IT85_C0IER); 1241 } 1242 1243 /* disable the device; this must be called with the device spinlock held */ 1244 static void it8709_disable(struct ite_dev *dev) 1245 { 1246 ite_dbg("%s called", __func__); 1247 1248 /* clear out all interrupt enable flags */ 1249 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & 1250 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE), 1251 IT85_C0IER); 1252 1253 /* disable the receiver */ 1254 it8709_disable_rx(dev); 1255 1256 /* erase the FIFO */ 1257 it8709_wr(dev, IT85_FIFOCLR | it8709_rr(dev, IT85_C0MSTCR), 1258 IT85_C0MSTCR); 1259 } 1260 1261 /* initialize the hardware */ 1262 static void it8709_init_hardware(struct ite_dev *dev) 1263 { 1264 ite_dbg("%s called", __func__); 1265 1266 /* disable all the interrupts */ 1267 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & 1268 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE), 1269 IT85_C0IER); 1270 1271 /* program the baud rate divisor */ 1272 it8709_wr(dev, ITE_BAUDRATE_DIVISOR & 0xff, IT85_C0BDLR); 1273 it8709_wr(dev, (ITE_BAUDRATE_DIVISOR >> 8) & 0xff, 1274 IT85_C0BDHR); 1275 1276 /* program the C0MSTCR register defaults */ 1277 it8709_wr(dev, (it8709_rr(dev, IT85_C0MSTCR) & 1278 ~(IT85_ILSEL | IT85_ILE | IT85_FIFOTL 1279 | IT85_FIFOCLR | IT85_RESET)) | IT85_FIFOTL_DEFAULT, 1280 IT85_C0MSTCR); 1281 1282 /* program the C0RCR register defaults */ 1283 it8709_wr(dev, (it8709_rr(dev, IT85_C0RCR) & 1284 ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND | IT85_RXACT 1285 | IT85_RXDCR)) | ITE_RXDCR_DEFAULT, 1286 IT85_C0RCR); 1287 1288 /* program the C0TCR register defaults */ 1289 it8709_wr(dev, (it8709_rr(dev, IT85_C0TCR) & ~(IT85_TXMPM | IT85_TXMPW)) 1290 | IT85_TXRLE | IT85_TXENDF | IT85_TXMPM_DEFAULT 1291 | IT85_TXMPW_DEFAULT, 1292 IT85_C0TCR); 1293 1294 /* program the carrier parameters */ 1295 ite_set_carrier_params(dev); 1296 } 1297 1298 1299 /* generic hardware setup/teardown code */ 1300 1301 /* activate the device for use */ 1302 static int ite_open(struct rc_dev *rcdev) 1303 { 1304 struct ite_dev *dev = rcdev->priv; 1305 unsigned long flags; 1306 1307 ite_dbg("%s called", __func__); 1308 1309 spin_lock_irqsave(&dev->lock, flags); 1310 dev->in_use = true; 1311 1312 /* enable the receiver */ 1313 dev->params.enable_rx(dev); 1314 1315 spin_unlock_irqrestore(&dev->lock, flags); 1316 1317 return 0; 1318 } 1319 1320 /* deactivate the device for use */ 1321 static void ite_close(struct rc_dev *rcdev) 1322 { 1323 struct ite_dev *dev = rcdev->priv; 1324 unsigned long flags; 1325 1326 ite_dbg("%s called", __func__); 1327 1328 spin_lock_irqsave(&dev->lock, flags); 1329 dev->in_use = false; 1330 1331 /* wait for any transmission to end */ 1332 spin_unlock_irqrestore(&dev->lock, flags); 1333 wait_event_interruptible(dev->tx_ended, !dev->transmitting); 1334 spin_lock_irqsave(&dev->lock, flags); 1335 1336 dev->params.disable(dev); 1337 1338 spin_unlock_irqrestore(&dev->lock, flags); 1339 } 1340 1341 /* supported models and their parameters */ 1342 static const struct ite_dev_params ite_dev_descs[] = { 1343 { /* 0: ITE8704 */ 1344 .model = "ITE8704 CIR transceiver", 1345 .io_region_size = IT87_IOREG_LENGTH, 1346 .io_rsrc_no = 0, 1347 .hw_tx_capable = true, 1348 .sample_period = (u32) (1000000000ULL / 115200), 1349 .tx_carrier_freq = 38000, 1350 .tx_duty_cycle = 33, 1351 .rx_low_carrier_freq = 0, 1352 .rx_high_carrier_freq = 0, 1353 1354 /* operations */ 1355 .get_irq_causes = it87_get_irq_causes, 1356 .enable_rx = it87_enable_rx, 1357 .idle_rx = it87_idle_rx, 1358 .disable_rx = it87_idle_rx, 1359 .get_rx_bytes = it87_get_rx_bytes, 1360 .enable_tx_interrupt = it87_enable_tx_interrupt, 1361 .disable_tx_interrupt = it87_disable_tx_interrupt, 1362 .get_tx_used_slots = it87_get_tx_used_slots, 1363 .put_tx_byte = it87_put_tx_byte, 1364 .disable = it87_disable, 1365 .init_hardware = it87_init_hardware, 1366 .set_carrier_params = it87_set_carrier_params, 1367 }, 1368 { /* 1: ITE8713 */ 1369 .model = "ITE8713 CIR transceiver", 1370 .io_region_size = IT87_IOREG_LENGTH, 1371 .io_rsrc_no = 0, 1372 .hw_tx_capable = true, 1373 .sample_period = (u32) (1000000000ULL / 115200), 1374 .tx_carrier_freq = 38000, 1375 .tx_duty_cycle = 33, 1376 .rx_low_carrier_freq = 0, 1377 .rx_high_carrier_freq = 0, 1378 1379 /* operations */ 1380 .get_irq_causes = it87_get_irq_causes, 1381 .enable_rx = it87_enable_rx, 1382 .idle_rx = it87_idle_rx, 1383 .disable_rx = it87_idle_rx, 1384 .get_rx_bytes = it87_get_rx_bytes, 1385 .enable_tx_interrupt = it87_enable_tx_interrupt, 1386 .disable_tx_interrupt = it87_disable_tx_interrupt, 1387 .get_tx_used_slots = it87_get_tx_used_slots, 1388 .put_tx_byte = it87_put_tx_byte, 1389 .disable = it87_disable, 1390 .init_hardware = it87_init_hardware, 1391 .set_carrier_params = it87_set_carrier_params, 1392 }, 1393 { /* 2: ITE8708 */ 1394 .model = "ITE8708 CIR transceiver", 1395 .io_region_size = IT8708_IOREG_LENGTH, 1396 .io_rsrc_no = 0, 1397 .hw_tx_capable = true, 1398 .sample_period = (u32) (1000000000ULL / 115200), 1399 .tx_carrier_freq = 38000, 1400 .tx_duty_cycle = 33, 1401 .rx_low_carrier_freq = 0, 1402 .rx_high_carrier_freq = 0, 1403 1404 /* operations */ 1405 .get_irq_causes = it8708_get_irq_causes, 1406 .enable_rx = it8708_enable_rx, 1407 .idle_rx = it8708_idle_rx, 1408 .disable_rx = it8708_idle_rx, 1409 .get_rx_bytes = it8708_get_rx_bytes, 1410 .enable_tx_interrupt = it8708_enable_tx_interrupt, 1411 .disable_tx_interrupt = 1412 it8708_disable_tx_interrupt, 1413 .get_tx_used_slots = it8708_get_tx_used_slots, 1414 .put_tx_byte = it8708_put_tx_byte, 1415 .disable = it8708_disable, 1416 .init_hardware = it8708_init_hardware, 1417 .set_carrier_params = it8708_set_carrier_params, 1418 }, 1419 { /* 3: ITE8709 */ 1420 .model = "ITE8709 CIR transceiver", 1421 .io_region_size = IT8709_IOREG_LENGTH, 1422 .io_rsrc_no = 2, 1423 .hw_tx_capable = true, 1424 .sample_period = (u32) (1000000000ULL / 115200), 1425 .tx_carrier_freq = 38000, 1426 .tx_duty_cycle = 33, 1427 .rx_low_carrier_freq = 0, 1428 .rx_high_carrier_freq = 0, 1429 1430 /* operations */ 1431 .get_irq_causes = it8709_get_irq_causes, 1432 .enable_rx = it8709_enable_rx, 1433 .idle_rx = it8709_idle_rx, 1434 .disable_rx = it8709_idle_rx, 1435 .get_rx_bytes = it8709_get_rx_bytes, 1436 .enable_tx_interrupt = it8709_enable_tx_interrupt, 1437 .disable_tx_interrupt = 1438 it8709_disable_tx_interrupt, 1439 .get_tx_used_slots = it8709_get_tx_used_slots, 1440 .put_tx_byte = it8709_put_tx_byte, 1441 .disable = it8709_disable, 1442 .init_hardware = it8709_init_hardware, 1443 .set_carrier_params = it8709_set_carrier_params, 1444 }, 1445 }; 1446 1447 static const struct pnp_device_id ite_ids[] = { 1448 {"ITE8704", 0}, /* Default model */ 1449 {"ITE8713", 1}, /* CIR found in EEEBox 1501U */ 1450 {"ITE8708", 2}, /* Bridged IT8512 */ 1451 {"ITE8709", 3}, /* SRAM-Bridged IT8512 */ 1452 {"", 0}, 1453 }; 1454 1455 /* allocate memory, probe hardware, and initialize everything */ 1456 static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id 1457 *dev_id) 1458 { 1459 const struct ite_dev_params *dev_desc = NULL; 1460 struct ite_dev *itdev = NULL; 1461 struct rc_dev *rdev = NULL; 1462 int ret = -ENOMEM; 1463 int model_no; 1464 int io_rsrc_no; 1465 1466 ite_dbg("%s called", __func__); 1467 1468 itdev = kzalloc(sizeof(struct ite_dev), GFP_KERNEL); 1469 if (!itdev) 1470 return ret; 1471 1472 /* input device for IR remote (and tx) */ 1473 rdev = rc_allocate_device(); 1474 if (!rdev) 1475 goto failure; 1476 itdev->rdev = rdev; 1477 1478 ret = -ENODEV; 1479 1480 /* get the model number */ 1481 model_no = (int)dev_id->driver_data; 1482 ite_pr(KERN_NOTICE, "Auto-detected model: %s\n", 1483 ite_dev_descs[model_no].model); 1484 1485 if (model_number >= 0 && model_number < ARRAY_SIZE(ite_dev_descs)) { 1486 model_no = model_number; 1487 ite_pr(KERN_NOTICE, "The model has been fixed by a module " 1488 "parameter."); 1489 } 1490 1491 ite_pr(KERN_NOTICE, "Using model: %s\n", ite_dev_descs[model_no].model); 1492 1493 /* get the description for the device */ 1494 dev_desc = &ite_dev_descs[model_no]; 1495 io_rsrc_no = dev_desc->io_rsrc_no; 1496 1497 /* validate pnp resources */ 1498 if (!pnp_port_valid(pdev, io_rsrc_no) || 1499 pnp_port_len(pdev, io_rsrc_no) != dev_desc->io_region_size) { 1500 dev_err(&pdev->dev, "IR PNP Port not valid!\n"); 1501 goto failure; 1502 } 1503 1504 if (!pnp_irq_valid(pdev, 0)) { 1505 dev_err(&pdev->dev, "PNP IRQ not valid!\n"); 1506 goto failure; 1507 } 1508 1509 /* store resource values */ 1510 itdev->cir_addr = pnp_port_start(pdev, io_rsrc_no); 1511 itdev->cir_irq = pnp_irq(pdev, 0); 1512 1513 /* initialize spinlocks */ 1514 spin_lock_init(&itdev->lock); 1515 1516 /* initialize raw event */ 1517 init_ir_raw_event(&itdev->rawir); 1518 1519 /* set driver data into the pnp device */ 1520 pnp_set_drvdata(pdev, itdev); 1521 itdev->pdev = pdev; 1522 1523 /* initialize waitqueues for transmission */ 1524 init_waitqueue_head(&itdev->tx_queue); 1525 init_waitqueue_head(&itdev->tx_ended); 1526 1527 /* copy model-specific parameters */ 1528 itdev->params = *dev_desc; 1529 1530 /* apply any overrides */ 1531 if (sample_period > 0) 1532 itdev->params.sample_period = sample_period; 1533 1534 if (tx_carrier_freq > 0) 1535 itdev->params.tx_carrier_freq = tx_carrier_freq; 1536 1537 if (tx_duty_cycle > 0 && tx_duty_cycle <= 100) 1538 itdev->params.tx_duty_cycle = tx_duty_cycle; 1539 1540 if (rx_low_carrier_freq > 0) 1541 itdev->params.rx_low_carrier_freq = rx_low_carrier_freq; 1542 1543 if (rx_high_carrier_freq > 0) 1544 itdev->params.rx_high_carrier_freq = rx_high_carrier_freq; 1545 1546 /* print out parameters */ 1547 ite_pr(KERN_NOTICE, "TX-capable: %d\n", (int) 1548 itdev->params.hw_tx_capable); 1549 ite_pr(KERN_NOTICE, "Sample period (ns): %ld\n", (long) 1550 itdev->params.sample_period); 1551 ite_pr(KERN_NOTICE, "TX carrier frequency (Hz): %d\n", (int) 1552 itdev->params.tx_carrier_freq); 1553 ite_pr(KERN_NOTICE, "TX duty cycle (%%): %d\n", (int) 1554 itdev->params.tx_duty_cycle); 1555 ite_pr(KERN_NOTICE, "RX low carrier frequency (Hz): %d\n", (int) 1556 itdev->params.rx_low_carrier_freq); 1557 ite_pr(KERN_NOTICE, "RX high carrier frequency (Hz): %d\n", (int) 1558 itdev->params.rx_high_carrier_freq); 1559 1560 /* set up hardware initial state */ 1561 itdev->params.init_hardware(itdev); 1562 1563 /* set up ir-core props */ 1564 rdev->priv = itdev; 1565 rdev->driver_type = RC_DRIVER_IR_RAW; 1566 rdev->allowed_protos = RC_TYPE_ALL; 1567 rdev->open = ite_open; 1568 rdev->close = ite_close; 1569 rdev->s_idle = ite_s_idle; 1570 rdev->s_rx_carrier_range = ite_set_rx_carrier_range; 1571 rdev->min_timeout = ITE_MIN_IDLE_TIMEOUT; 1572 rdev->max_timeout = ITE_MAX_IDLE_TIMEOUT; 1573 rdev->timeout = ITE_IDLE_TIMEOUT; 1574 rdev->rx_resolution = ITE_BAUDRATE_DIVISOR * 1575 itdev->params.sample_period; 1576 rdev->tx_resolution = ITE_BAUDRATE_DIVISOR * 1577 itdev->params.sample_period; 1578 1579 /* set up transmitter related values if needed */ 1580 if (itdev->params.hw_tx_capable) { 1581 rdev->tx_ir = ite_tx_ir; 1582 rdev->s_tx_carrier = ite_set_tx_carrier; 1583 rdev->s_tx_duty_cycle = ite_set_tx_duty_cycle; 1584 } 1585 1586 rdev->input_name = dev_desc->model; 1587 rdev->input_id.bustype = BUS_HOST; 1588 rdev->input_id.vendor = PCI_VENDOR_ID_ITE; 1589 rdev->input_id.product = 0; 1590 rdev->input_id.version = 0; 1591 rdev->driver_name = ITE_DRIVER_NAME; 1592 rdev->map_name = RC_MAP_RC6_MCE; 1593 1594 ret = -EBUSY; 1595 /* now claim resources */ 1596 if (!request_region(itdev->cir_addr, 1597 dev_desc->io_region_size, ITE_DRIVER_NAME)) 1598 goto failure; 1599 1600 if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED, 1601 ITE_DRIVER_NAME, (void *)itdev)) 1602 goto failure2; 1603 1604 ret = rc_register_device(rdev); 1605 if (ret) 1606 goto failure3; 1607 1608 ite_pr(KERN_NOTICE, "driver has been successfully loaded\n"); 1609 1610 return 0; 1611 1612 failure3: 1613 free_irq(itdev->cir_irq, itdev); 1614 failure2: 1615 release_region(itdev->cir_addr, itdev->params.io_region_size); 1616 failure: 1617 rc_free_device(rdev); 1618 kfree(itdev); 1619 1620 return ret; 1621 } 1622 1623 static void __devexit ite_remove(struct pnp_dev *pdev) 1624 { 1625 struct ite_dev *dev = pnp_get_drvdata(pdev); 1626 unsigned long flags; 1627 1628 ite_dbg("%s called", __func__); 1629 1630 spin_lock_irqsave(&dev->lock, flags); 1631 1632 /* disable hardware */ 1633 dev->params.disable(dev); 1634 1635 spin_unlock_irqrestore(&dev->lock, flags); 1636 1637 /* free resources */ 1638 free_irq(dev->cir_irq, dev); 1639 release_region(dev->cir_addr, dev->params.io_region_size); 1640 1641 rc_unregister_device(dev->rdev); 1642 1643 kfree(dev); 1644 } 1645 1646 static int ite_suspend(struct pnp_dev *pdev, pm_message_t state) 1647 { 1648 struct ite_dev *dev = pnp_get_drvdata(pdev); 1649 unsigned long flags; 1650 1651 ite_dbg("%s called", __func__); 1652 1653 /* wait for any transmission to end */ 1654 wait_event_interruptible(dev->tx_ended, !dev->transmitting); 1655 1656 spin_lock_irqsave(&dev->lock, flags); 1657 1658 /* disable all interrupts */ 1659 dev->params.disable(dev); 1660 1661 spin_unlock_irqrestore(&dev->lock, flags); 1662 1663 return 0; 1664 } 1665 1666 static int ite_resume(struct pnp_dev *pdev) 1667 { 1668 int ret = 0; 1669 struct ite_dev *dev = pnp_get_drvdata(pdev); 1670 unsigned long flags; 1671 1672 ite_dbg("%s called", __func__); 1673 1674 spin_lock_irqsave(&dev->lock, flags); 1675 1676 /* reinitialize hardware config registers */ 1677 dev->params.init_hardware(dev); 1678 /* enable the receiver */ 1679 dev->params.enable_rx(dev); 1680 1681 spin_unlock_irqrestore(&dev->lock, flags); 1682 1683 return ret; 1684 } 1685 1686 static void ite_shutdown(struct pnp_dev *pdev) 1687 { 1688 struct ite_dev *dev = pnp_get_drvdata(pdev); 1689 unsigned long flags; 1690 1691 ite_dbg("%s called", __func__); 1692 1693 spin_lock_irqsave(&dev->lock, flags); 1694 1695 /* disable all interrupts */ 1696 dev->params.disable(dev); 1697 1698 spin_unlock_irqrestore(&dev->lock, flags); 1699 } 1700 1701 static struct pnp_driver ite_driver = { 1702 .name = ITE_DRIVER_NAME, 1703 .id_table = ite_ids, 1704 .probe = ite_probe, 1705 .remove = __devexit_p(ite_remove), 1706 .suspend = ite_suspend, 1707 .resume = ite_resume, 1708 .shutdown = ite_shutdown, 1709 }; 1710 1711 int ite_init(void) 1712 { 1713 return pnp_register_driver(&ite_driver); 1714 } 1715 1716 void ite_exit(void) 1717 { 1718 pnp_unregister_driver(&ite_driver); 1719 } 1720 1721 MODULE_DEVICE_TABLE(pnp, ite_ids); 1722 MODULE_DESCRIPTION("ITE Tech Inc. IT8712F/ITE8512F CIR driver"); 1723 1724 MODULE_AUTHOR("Juan J. Garcia de Soria <skandalfo@gmail.com>"); 1725 MODULE_LICENSE("GPL"); 1726 1727 module_init(ite_init); 1728 module_exit(ite_exit); 1729