drivers/media/rc/ite-cir.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ite_is_high_carrier_freq
ite_get_carrier_freq_bits
ite_get_pulse_width_bits
ite_decode_bytes
ite_set_carrier_params
ite_cir_isr
ite_set_rx_carrier_range
ite_set_tx_carrier
ite_set_tx_duty_cycle
ite_tx_ir
ite_s_idle
it87_get_irq_causes
it87_set_carrier_params
it87_get_rx_bytes
it87_get_tx_used_slots
it87_put_tx_byte
it87_idle_rx
it87_disable_rx
it87_enable_rx
it87_disable_tx_interrupt
it87_enable_tx_interrupt
it87_disable
it87_init_hardware
it8708_get_irq_causes
it8708_set_carrier_params
it8708_get_rx_bytes
it8708_get_tx_used_slots
it8708_put_tx_byte
it8708_idle_rx
it8708_disable_rx
it8708_enable_rx
it8708_disable_tx_interrupt
it8708_enable_tx_interrupt
it8708_disable
it8708_init_hardware
it8709_rm
it8709_wm
it8709_wait
it8709_rr
it8709_wr
it8709_get_irq_causes
it8709_set_carrier_params
it8709_get_rx_bytes
it8709_get_tx_used_slots
it8709_put_tx_byte
it8709_idle_rx
it8709_disable_rx
it8709_enable_rx
it8709_disable_tx_interrupt
it8709_enable_tx_interrupt
it8709_disable
it8709_init_hardware
ite_open
ite_close
ite_probe
ite_remove
ite_suspend
ite_resume
ite_shutdown
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for ITE Tech Inc. IT8712F/IT8512 CIR
   4  *
   5  * Copyright (C) 2010 Juan Jesús García de Soria <skandalfo@gmail.com>
   6  *
   7  * Inspired by the original lirc_it87 and lirc_ite8709 drivers, on top of the
   8  * skeleton provided by the nuvoton-cir driver.
   9  *
  10  * The lirc_it87 driver was originally written by Hans-Gunter Lutke Uphues
  11  * <hg_lu@web.de> in 2001, with enhancements by Christoph Bartelmus
  12  * <lirc@bartelmus.de>, Andrew Calkin <r_tay@hotmail.com> and James Edwards
  13  * <jimbo-lirc@edwardsclan.net>.
  14  *
  15  * The lirc_ite8709 driver was written by Grégory Lardière
  16  * <spmf2004-lirc@yahoo.fr> in 2008.
  17  */
  18 
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/pnp.h>
  22 #include <linux/io.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/sched.h>
  25 #include <linux/delay.h>
  26 #include <linux/slab.h>
  27 #include <linux/input.h>
  28 #include <linux/bitops.h>
  29 #include <media/rc-core.h>
  30 #include <linux/pci_ids.h>
  31 
  32 #include "ite-cir.h"
  33 
  34 /* module parameters */
  35 
  36 /* debug level */
  37 static int debug;
  38 module_param(debug, int, S_IRUGO | S_IWUSR);
  39 MODULE_PARM_DESC(debug, "Enable debugging output");
  40 
  41 /* low limit for RX carrier freq, Hz, 0 for no RX demodulation */
  42 static int rx_low_carrier_freq;
  43 module_param(rx_low_carrier_freq, int, S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(rx_low_carrier_freq, "Override low RX carrier frequency, Hz, 0 for no RX demodulation");
  45 
  46 /* high limit for RX carrier freq, Hz, 0 for no RX demodulation */
  47 static int rx_high_carrier_freq;
  48 module_param(rx_high_carrier_freq, int, S_IRUGO | S_IWUSR);
  49 MODULE_PARM_DESC(rx_high_carrier_freq, "Override high RX carrier frequency, Hz, 0 for no RX demodulation");
  50 
  51 /* override tx carrier frequency */
  52 static int tx_carrier_freq;
  53 module_param(tx_carrier_freq, int, S_IRUGO | S_IWUSR);
  54 MODULE_PARM_DESC(tx_carrier_freq, "Override TX carrier frequency, Hz");
  55 
  56 /* override tx duty cycle */
  57 static int tx_duty_cycle;
  58 module_param(tx_duty_cycle, int, S_IRUGO | S_IWUSR);
  59 MODULE_PARM_DESC(tx_duty_cycle, "Override TX duty cycle, 1-100");
  60 
  61 /* override default sample period */
  62 static long sample_period;
  63 module_param(sample_period, long, S_IRUGO | S_IWUSR);
  64 MODULE_PARM_DESC(sample_period, "Override carrier sample period, us");
  65 
  66 /* override detected model id */
  67 static int model_number = -1;
  68 module_param(model_number, int, S_IRUGO | S_IWUSR);
  69 MODULE_PARM_DESC(model_number, "Use this model number, don't autodetect");
  70 
  71 
  72 /* HW-independent code functions */
  73 
  74 /* check whether carrier frequency is high frequency */
  75 static inline bool ite_is_high_carrier_freq(unsigned int freq)
  76 {
  77         return freq >= ITE_HCF_MIN_CARRIER_FREQ;
  78 }
  79 
  80 /* get the bits required to program the carrier frequency in CFQ bits,
  81  * unshifted */
  82 static u8 ite_get_carrier_freq_bits(unsigned int freq)
  83 {
  84         if (ite_is_high_carrier_freq(freq)) {
  85                 if (freq < 425000)
  86                         return ITE_CFQ_400;
  87 
  88                 else if (freq < 465000)
  89                         return ITE_CFQ_450;
  90 
  91                 else if (freq < 490000)
  92                         return ITE_CFQ_480;
  93 
  94                 else
  95                         return ITE_CFQ_500;
  96         } else {
  97                         /* trim to limits */
  98                 if (freq < ITE_LCF_MIN_CARRIER_FREQ)
  99                         freq = ITE_LCF_MIN_CARRIER_FREQ;
 100                 if (freq > ITE_LCF_MAX_CARRIER_FREQ)
 101                         freq = ITE_LCF_MAX_CARRIER_FREQ;
 102 
 103                 /* convert to kHz and subtract the base freq */
 104                 freq =
 105                     DIV_ROUND_CLOSEST(freq - ITE_LCF_MIN_CARRIER_FREQ,
 106                                       1000);
 107 
 108                 return (u8) freq;
 109         }
 110 }
 111 
 112 /* get the bits required to program the pulse with in TXMPW */
 113 static u8 ite_get_pulse_width_bits(unsigned int freq, int duty_cycle)
 114 {
 115         unsigned long period_ns, on_ns;
 116 
 117         /* sanitize freq into range */
 118         if (freq < ITE_LCF_MIN_CARRIER_FREQ)
 119                 freq = ITE_LCF_MIN_CARRIER_FREQ;
 120         if (freq > ITE_HCF_MAX_CARRIER_FREQ)
 121                 freq = ITE_HCF_MAX_CARRIER_FREQ;
 122 
 123         period_ns = 1000000000UL / freq;
 124         on_ns = period_ns * duty_cycle / 100;
 125 
 126         if (ite_is_high_carrier_freq(freq)) {
 127                 if (on_ns < 750)
 128                         return ITE_TXMPW_A;
 129 
 130                 else if (on_ns < 850)
 131                         return ITE_TXMPW_B;
 132 
 133                 else if (on_ns < 950)
 134                         return ITE_TXMPW_C;
 135 
 136                 else if (on_ns < 1080)
 137                         return ITE_TXMPW_D;
 138 
 139                 else
 140                         return ITE_TXMPW_E;
 141         } else {
 142                 if (on_ns < 6500)
 143                         return ITE_TXMPW_A;
 144 
 145                 else if (on_ns < 7850)
 146                         return ITE_TXMPW_B;
 147 
 148                 else if (on_ns < 9650)
 149                         return ITE_TXMPW_C;
 150 
 151                 else if (on_ns < 11950)
 152                         return ITE_TXMPW_D;
 153 
 154                 else
 155                         return ITE_TXMPW_E;
 156         }
 157 }
 158 
 159 /* decode raw bytes as received by the hardware, and push them to the ir-core
 160  * layer */
 161 static void ite_decode_bytes(struct ite_dev *dev, const u8 * data, int
 162                              length)
 163 {
 164         u32 sample_period;
 165         unsigned long *ldata;
 166         unsigned int next_one, next_zero, size;
 167         struct ir_raw_event ev = {};
 168 
 169         if (length == 0)
 170                 return;
 171 
 172         sample_period = dev->params.sample_period;
 173         ldata = (unsigned long *)data;
 174         size = length << 3;
 175         next_one = find_next_bit_le(ldata, size, 0);
 176         if (next_one > 0) {
 177                 ev.pulse = true;
 178                 ev.duration =
 179                     ITE_BITS_TO_NS(next_one, sample_period);
 180                 ir_raw_event_store_with_filter(dev->rdev, &ev);
 181         }
 182 
 183         while (next_one < size) {
 184                 next_zero = find_next_zero_bit_le(ldata, size, next_one + 1);
 185                 ev.pulse = false;
 186                 ev.duration = ITE_BITS_TO_NS(next_zero - next_one, sample_period);
 187                 ir_raw_event_store_with_filter(dev->rdev, &ev);
 188 
 189                 if (next_zero < size) {
 190                         next_one =
 191                             find_next_bit_le(ldata,
 192                                                      size,
 193                                                      next_zero + 1);
 194                         ev.pulse = true;
 195                         ev.duration =
 196                             ITE_BITS_TO_NS(next_one - next_zero,
 197                                            sample_period);
 198                         ir_raw_event_store_with_filter
 199                             (dev->rdev, &ev);
 200                 } else
 201                         next_one = size;
 202         }
 203 
 204         ir_raw_event_handle(dev->rdev);
 205 
 206         ite_dbg_verbose("decoded %d bytes.", length);
 207 }
 208 
 209 /* set all the rx/tx carrier parameters; this must be called with the device
 210  * spinlock held */
 211 static void ite_set_carrier_params(struct ite_dev *dev)
 212 {
 213         unsigned int freq, low_freq, high_freq;
 214         int allowance;
 215         bool use_demodulator;
 216         bool for_tx = dev->transmitting;
 217 
 218         ite_dbg("%s called", __func__);
 219 
 220         if (for_tx) {
 221                 /* we don't need no stinking calculations */
 222                 freq = dev->params.tx_carrier_freq;
 223                 allowance = ITE_RXDCR_DEFAULT;
 224                 use_demodulator = false;
 225         } else {
 226                 low_freq = dev->params.rx_low_carrier_freq;
 227                 high_freq = dev->params.rx_high_carrier_freq;
 228 
 229                 if (low_freq == 0) {
 230                         /* don't demodulate */
 231                         freq =
 232                         ITE_DEFAULT_CARRIER_FREQ;
 233                         allowance = ITE_RXDCR_DEFAULT;
 234                         use_demodulator = false;
 235                 } else {
 236                         /* calculate the middle freq */
 237                         freq = (low_freq + high_freq) / 2;
 238 
 239                         /* calculate the allowance */
 240                         allowance =
 241                             DIV_ROUND_CLOSEST(10000 * (high_freq - low_freq),
 242                                               ITE_RXDCR_PER_10000_STEP
 243                                               * (high_freq + low_freq));
 244 
 245                         if (allowance < 1)
 246                                 allowance = 1;
 247 
 248                         if (allowance > ITE_RXDCR_MAX)
 249                                 allowance = ITE_RXDCR_MAX;
 250 
 251                         use_demodulator = true;
 252                 }
 253         }
 254 
 255         /* set the carrier parameters in a device-dependent way */
 256         dev->params.set_carrier_params(dev, ite_is_high_carrier_freq(freq),
 257                  use_demodulator, ite_get_carrier_freq_bits(freq), allowance,
 258                  ite_get_pulse_width_bits(freq, dev->params.tx_duty_cycle));
 259 }
 260 
 261 /* interrupt service routine for incoming and outgoing CIR data */
 262 static irqreturn_t ite_cir_isr(int irq, void *data)
 263 {
 264         struct ite_dev *dev = data;
 265         unsigned long flags;
 266         irqreturn_t ret = IRQ_RETVAL(IRQ_NONE);
 267         u8 rx_buf[ITE_RX_FIFO_LEN];
 268         int rx_bytes;
 269         int iflags;
 270 
 271         ite_dbg_verbose("%s firing", __func__);
 272 
 273         /* grab the spinlock */
 274         spin_lock_irqsave(&dev->lock, flags);
 275 
 276         /* read the interrupt flags */
 277         iflags = dev->params.get_irq_causes(dev);
 278 
 279         /* check for the receive interrupt */
 280         if (iflags & (ITE_IRQ_RX_FIFO | ITE_IRQ_RX_FIFO_OVERRUN)) {
 281                 /* read the FIFO bytes */
 282                 rx_bytes =
 283                         dev->params.get_rx_bytes(dev, rx_buf,
 284                                              ITE_RX_FIFO_LEN);
 285 
 286                 if (rx_bytes > 0) {
 287                         /* drop the spinlock, since the ir-core layer
 288                          * may call us back again through
 289                          * ite_s_idle() */
 290                         spin_unlock_irqrestore(&dev->
 291                                                                          lock,
 292                                                                          flags);
 293 
 294                         /* decode the data we've just received */
 295                         ite_decode_bytes(dev, rx_buf,
 296                                                                    rx_bytes);
 297 
 298                         /* reacquire the spinlock */
 299                         spin_lock_irqsave(&dev->lock,
 300                                                                     flags);
 301 
 302                         /* mark the interrupt as serviced */
 303                         ret = IRQ_RETVAL(IRQ_HANDLED);
 304                 }
 305         } else if (iflags & ITE_IRQ_TX_FIFO) {
 306                 /* FIFO space available interrupt */
 307                 ite_dbg_verbose("got interrupt for TX FIFO");
 308 
 309                 /* wake any sleeping transmitter */
 310                 wake_up_interruptible(&dev->tx_queue);
 311 
 312                 /* mark the interrupt as serviced */
 313                 ret = IRQ_RETVAL(IRQ_HANDLED);
 314         }
 315 
 316         /* drop the spinlock */
 317         spin_unlock_irqrestore(&dev->lock, flags);
 318 
 319         ite_dbg_verbose("%s done returning %d", __func__, (int)ret);
 320 
 321         return ret;
 322 }
 323 
 324 /* set the rx carrier freq range, guess it's in Hz... */
 325 static int ite_set_rx_carrier_range(struct rc_dev *rcdev, u32 carrier_low, u32
 326                                     carrier_high)
 327 {
 328         unsigned long flags;
 329         struct ite_dev *dev = rcdev->priv;
 330 
 331         spin_lock_irqsave(&dev->lock, flags);
 332         dev->params.rx_low_carrier_freq = carrier_low;
 333         dev->params.rx_high_carrier_freq = carrier_high;
 334         ite_set_carrier_params(dev);
 335         spin_unlock_irqrestore(&dev->lock, flags);
 336 
 337         return 0;
 338 }
 339 
 340 /* set the tx carrier freq, guess it's in Hz... */
 341 static int ite_set_tx_carrier(struct rc_dev *rcdev, u32 carrier)
 342 {
 343         unsigned long flags;
 344         struct ite_dev *dev = rcdev->priv;
 345 
 346         spin_lock_irqsave(&dev->lock, flags);
 347         dev->params.tx_carrier_freq = carrier;
 348         ite_set_carrier_params(dev);
 349         spin_unlock_irqrestore(&dev->lock, flags);
 350 
 351         return 0;
 352 }
 353 
 354 /* set the tx duty cycle by controlling the pulse width */
 355 static int ite_set_tx_duty_cycle(struct rc_dev *rcdev, u32 duty_cycle)
 356 {
 357         unsigned long flags;
 358         struct ite_dev *dev = rcdev->priv;
 359 
 360         spin_lock_irqsave(&dev->lock, flags);
 361         dev->params.tx_duty_cycle = duty_cycle;
 362         ite_set_carrier_params(dev);
 363         spin_unlock_irqrestore(&dev->lock, flags);
 364 
 365         return 0;
 366 }
 367 
 368 /* transmit out IR pulses; what you get here is a batch of alternating
 369  * pulse/space/pulse/space lengths that we should write out completely through
 370  * the FIFO, blocking on a full FIFO */
 371 static int ite_tx_ir(struct rc_dev *rcdev, unsigned *txbuf, unsigned n)
 372 {
 373         unsigned long flags;
 374         struct ite_dev *dev = rcdev->priv;
 375         bool is_pulse = false;
 376         int remaining_us, fifo_avail, fifo_remaining, last_idx = 0;
 377         int max_rle_us, next_rle_us;
 378         int ret = n;
 379         u8 last_sent[ITE_TX_FIFO_LEN];
 380         u8 val;
 381 
 382         ite_dbg("%s called", __func__);
 383 
 384         /* clear the array just in case */
 385         memset(last_sent, 0, ARRAY_SIZE(last_sent));
 386 
 387         spin_lock_irqsave(&dev->lock, flags);
 388 
 389         /* let everybody know we're now transmitting */
 390         dev->transmitting = true;
 391 
 392         /* and set the carrier values for transmission */
 393         ite_set_carrier_params(dev);
 394 
 395         /* calculate how much time we can send in one byte */
 396         max_rle_us =
 397             (ITE_BAUDRATE_DIVISOR * dev->params.sample_period *
 398              ITE_TX_MAX_RLE) / 1000;
 399 
 400         /* disable the receiver */
 401         dev->params.disable_rx(dev);
 402 
 403         /* this is where we'll begin filling in the FIFO, until it's full.
 404          * then we'll just activate the interrupt, wait for it to wake us up
 405          * again, disable it, continue filling the FIFO... until everything
 406          * has been pushed out */
 407         fifo_avail =
 408             ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev);
 409 
 410         while (n > 0 && dev->in_use) {
 411                 /* transmit the next sample */
 412                 is_pulse = !is_pulse;
 413                 remaining_us = *(txbuf++);
 414                 n--;
 415 
 416                 ite_dbg("%s: %ld",
 417                                       ((is_pulse) ? "pulse" : "space"),
 418                                       (long int)
 419                                       remaining_us);
 420 
 421                 /* repeat while the pulse is non-zero length */
 422                 while (remaining_us > 0 && dev->in_use) {
 423                         if (remaining_us > max_rle_us)
 424                                 next_rle_us = max_rle_us;
 425 
 426                         else
 427                                 next_rle_us = remaining_us;
 428 
 429                         remaining_us -= next_rle_us;
 430 
 431                         /* check what's the length we have to pump out */
 432                         val = (ITE_TX_MAX_RLE * next_rle_us) / max_rle_us;
 433 
 434                         /* put it into the sent buffer */
 435                         last_sent[last_idx++] = val;
 436                         last_idx &= (ITE_TX_FIFO_LEN);
 437 
 438                         /* encode it for 7 bits */
 439                         val = (val - 1) & ITE_TX_RLE_MASK;
 440 
 441                         /* take into account pulse/space prefix */
 442                         if (is_pulse)
 443                                 val |= ITE_TX_PULSE;
 444 
 445                         else
 446                                 val |= ITE_TX_SPACE;
 447 
 448                         /*
 449                          * if we get to 0 available, read again, just in case
 450                          * some other slot got freed
 451                          */
 452                         if (fifo_avail <= 0)
 453                                 fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev);
 454 
 455                         /* if it's still full */
 456                         if (fifo_avail <= 0) {
 457                                 /* enable the tx interrupt */
 458                                 dev->params.
 459                                 enable_tx_interrupt(dev);
 460 
 461                                 /* drop the spinlock */
 462                                 spin_unlock_irqrestore(&dev->lock, flags);
 463 
 464                                 /* wait for the FIFO to empty enough */
 465                                 wait_event_interruptible(dev->tx_queue, (fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev)) >= 8);
 466 
 467                                 /* get the spinlock again */
 468                                 spin_lock_irqsave(&dev->lock, flags);
 469 
 470                                 /* disable the tx interrupt again. */
 471                                 dev->params.
 472                                 disable_tx_interrupt(dev);
 473                         }
 474 
 475                         /* now send the byte through the FIFO */
 476                         dev->params.put_tx_byte(dev, val);
 477                         fifo_avail--;
 478                 }
 479         }
 480 
 481         /* wait and don't return until the whole FIFO has been sent out;
 482          * otherwise we could configure the RX carrier params instead of the
 483          * TX ones while the transmission is still being performed! */
 484         fifo_remaining = dev->params.get_tx_used_slots(dev);
 485         remaining_us = 0;
 486         while (fifo_remaining > 0) {
 487                 fifo_remaining--;
 488                 last_idx--;
 489                 last_idx &= (ITE_TX_FIFO_LEN - 1);
 490                 remaining_us += last_sent[last_idx];
 491         }
 492         remaining_us = (remaining_us * max_rle_us) / (ITE_TX_MAX_RLE);
 493 
 494         /* drop the spinlock while we sleep */
 495         spin_unlock_irqrestore(&dev->lock, flags);
 496 
 497         /* sleep remaining_us microseconds */
 498         mdelay(DIV_ROUND_UP(remaining_us, 1000));
 499 
 500         /* reacquire the spinlock */
 501         spin_lock_irqsave(&dev->lock, flags);
 502 
 503         /* now we're not transmitting anymore */
 504         dev->transmitting = false;
 505 
 506         /* and set the carrier values for reception */
 507         ite_set_carrier_params(dev);
 508 
 509         /* re-enable the receiver */
 510         if (dev->in_use)
 511                 dev->params.enable_rx(dev);
 512 
 513         /* notify transmission end */
 514         wake_up_interruptible(&dev->tx_ended);
 515 
 516         spin_unlock_irqrestore(&dev->lock, flags);
 517 
 518         return ret;
 519 }
 520 
 521 /* idle the receiver if needed */
 522 static void ite_s_idle(struct rc_dev *rcdev, bool enable)
 523 {
 524         unsigned long flags;
 525         struct ite_dev *dev = rcdev->priv;
 526 
 527         ite_dbg("%s called", __func__);
 528 
 529         if (enable) {
 530                 spin_lock_irqsave(&dev->lock, flags);
 531                 dev->params.idle_rx(dev);
 532                 spin_unlock_irqrestore(&dev->lock, flags);
 533         }
 534 }
 535 
 536 
 537 /* IT8712F HW-specific functions */
 538 
 539 /* retrieve a bitmask of the current causes for a pending interrupt; this may
 540  * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN
 541  * */
 542 static int it87_get_irq_causes(struct ite_dev *dev)
 543 {
 544         u8 iflags;
 545         int ret = 0;
 546 
 547         ite_dbg("%s called", __func__);
 548 
 549         /* read the interrupt flags */
 550         iflags = inb(dev->cir_addr + IT87_IIR) & IT87_II;
 551 
 552         switch (iflags) {
 553         case IT87_II_RXDS:
 554                 ret = ITE_IRQ_RX_FIFO;
 555                 break;
 556         case IT87_II_RXFO:
 557                 ret = ITE_IRQ_RX_FIFO_OVERRUN;
 558                 break;
 559         case IT87_II_TXLDL:
 560                 ret = ITE_IRQ_TX_FIFO;
 561                 break;
 562         }
 563 
 564         return ret;
 565 }
 566 
 567 /* set the carrier parameters; to be called with the spinlock held */
 568 static void it87_set_carrier_params(struct ite_dev *dev, bool high_freq,
 569                                     bool use_demodulator,
 570                                     u8 carrier_freq_bits, u8 allowance_bits,
 571                                     u8 pulse_width_bits)
 572 {
 573         u8 val;
 574 
 575         ite_dbg("%s called", __func__);
 576 
 577         /* program the RCR register */
 578         val = inb(dev->cir_addr + IT87_RCR)
 579                 & ~(IT87_HCFS | IT87_RXEND | IT87_RXDCR);
 580 
 581         if (high_freq)
 582                 val |= IT87_HCFS;
 583 
 584         if (use_demodulator)
 585                 val |= IT87_RXEND;
 586 
 587         val |= allowance_bits;
 588 
 589         outb(val, dev->cir_addr + IT87_RCR);
 590 
 591         /* program the TCR2 register */
 592         outb((carrier_freq_bits << IT87_CFQ_SHIFT) | pulse_width_bits,
 593                 dev->cir_addr + IT87_TCR2);
 594 }
 595 
 596 /* read up to buf_size bytes from the RX FIFO; to be called with the spinlock
 597  * held */
 598 static int it87_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
 599 {
 600         int fifo, read = 0;
 601 
 602         ite_dbg("%s called", __func__);
 603 
 604         /* read how many bytes are still in the FIFO */
 605         fifo = inb(dev->cir_addr + IT87_RSR) & IT87_RXFBC;
 606 
 607         while (fifo > 0 && buf_size > 0) {
 608                 *(buf++) = inb(dev->cir_addr + IT87_DR);
 609                 fifo--;
 610                 read++;
 611                 buf_size--;
 612         }
 613 
 614         return read;
 615 }
 616 
 617 /* return how many bytes are still in the FIFO; this will be called
 618  * with the device spinlock NOT HELD while waiting for the TX FIFO to get
 619  * empty; let's expect this won't be a problem */
 620 static int it87_get_tx_used_slots(struct ite_dev *dev)
 621 {
 622         ite_dbg("%s called", __func__);
 623 
 624         return inb(dev->cir_addr + IT87_TSR) & IT87_TXFBC;
 625 }
 626 
 627 /* put a byte to the TX fifo; this should be called with the spinlock held */
 628 static void it87_put_tx_byte(struct ite_dev *dev, u8 value)
 629 {
 630         outb(value, dev->cir_addr + IT87_DR);
 631 }
 632 
 633 /* idle the receiver so that we won't receive samples until another
 634   pulse is detected; this must be called with the device spinlock held */
 635 static void it87_idle_rx(struct ite_dev *dev)
 636 {
 637         ite_dbg("%s called", __func__);
 638 
 639         /* disable streaming by clearing RXACT writing it as 1 */
 640         outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXACT,
 641                 dev->cir_addr + IT87_RCR);
 642 
 643         /* clear the FIFO */
 644         outb(inb(dev->cir_addr + IT87_TCR1) | IT87_FIFOCLR,
 645                 dev->cir_addr + IT87_TCR1);
 646 }
 647 
 648 /* disable the receiver; this must be called with the device spinlock held */
 649 static void it87_disable_rx(struct ite_dev *dev)
 650 {
 651         ite_dbg("%s called", __func__);
 652 
 653         /* disable the receiver interrupts */
 654         outb(inb(dev->cir_addr + IT87_IER) & ~(IT87_RDAIE | IT87_RFOIE),
 655                 dev->cir_addr + IT87_IER);
 656 
 657         /* disable the receiver */
 658         outb(inb(dev->cir_addr + IT87_RCR) & ~IT87_RXEN,
 659                 dev->cir_addr + IT87_RCR);
 660 
 661         /* clear the FIFO and RXACT (actually RXACT should have been cleared
 662         * in the previous outb() call) */
 663         it87_idle_rx(dev);
 664 }
 665 
 666 /* enable the receiver; this must be called with the device spinlock held */
 667 static void it87_enable_rx(struct ite_dev *dev)
 668 {
 669         ite_dbg("%s called", __func__);
 670 
 671         /* enable the receiver by setting RXEN */
 672         outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXEN,
 673                 dev->cir_addr + IT87_RCR);
 674 
 675         /* just prepare it to idle for the next reception */
 676         it87_idle_rx(dev);
 677 
 678         /* enable the receiver interrupts and master enable flag */
 679         outb(inb(dev->cir_addr + IT87_IER) | IT87_RDAIE | IT87_RFOIE | IT87_IEC,
 680                 dev->cir_addr + IT87_IER);
 681 }
 682 
 683 /* disable the transmitter interrupt; this must be called with the device
 684  * spinlock held */
 685 static void it87_disable_tx_interrupt(struct ite_dev *dev)
 686 {
 687         ite_dbg("%s called", __func__);
 688 
 689         /* disable the transmitter interrupts */
 690         outb(inb(dev->cir_addr + IT87_IER) & ~IT87_TLDLIE,
 691                 dev->cir_addr + IT87_IER);
 692 }
 693 
 694 /* enable the transmitter interrupt; this must be called with the device
 695  * spinlock held */
 696 static void it87_enable_tx_interrupt(struct ite_dev *dev)
 697 {
 698         ite_dbg("%s called", __func__);
 699 
 700         /* enable the transmitter interrupts and master enable flag */
 701         outb(inb(dev->cir_addr + IT87_IER) | IT87_TLDLIE | IT87_IEC,
 702                 dev->cir_addr + IT87_IER);
 703 }
 704 
 705 /* disable the device; this must be called with the device spinlock held */
 706 static void it87_disable(struct ite_dev *dev)
 707 {
 708         ite_dbg("%s called", __func__);
 709 
 710         /* clear out all interrupt enable flags */
 711         outb(inb(dev->cir_addr + IT87_IER) &
 712                 ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE),
 713                 dev->cir_addr + IT87_IER);
 714 
 715         /* disable the receiver */
 716         it87_disable_rx(dev);
 717 
 718         /* erase the FIFO */
 719         outb(IT87_FIFOCLR | inb(dev->cir_addr + IT87_TCR1),
 720                 dev->cir_addr + IT87_TCR1);
 721 }
 722 
 723 /* initialize the hardware */
 724 static void it87_init_hardware(struct ite_dev *dev)
 725 {
 726         ite_dbg("%s called", __func__);
 727 
 728         /* enable just the baud rate divisor register,
 729         disabling all the interrupts at the same time */
 730         outb((inb(dev->cir_addr + IT87_IER) &
 731                 ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE)) | IT87_BR,
 732                 dev->cir_addr + IT87_IER);
 733 
 734         /* write out the baud rate divisor */
 735         outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT87_BDLR);
 736         outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff, dev->cir_addr + IT87_BDHR);
 737 
 738         /* disable the baud rate divisor register again */
 739         outb(inb(dev->cir_addr + IT87_IER) & ~IT87_BR,
 740                 dev->cir_addr + IT87_IER);
 741 
 742         /* program the RCR register defaults */
 743         outb(ITE_RXDCR_DEFAULT, dev->cir_addr + IT87_RCR);
 744 
 745         /* program the TCR1 register */
 746         outb(IT87_TXMPM_DEFAULT | IT87_TXENDF | IT87_TXRLE
 747                 | IT87_FIFOTL_DEFAULT | IT87_FIFOCLR,
 748                 dev->cir_addr + IT87_TCR1);
 749 
 750         /* program the carrier parameters */
 751         ite_set_carrier_params(dev);
 752 }
 753 
 754 /* IT8512F on ITE8708 HW-specific functions */
 755 
 756 /* retrieve a bitmask of the current causes for a pending interrupt; this may
 757  * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN
 758  * */
 759 static int it8708_get_irq_causes(struct ite_dev *dev)
 760 {
 761         u8 iflags;
 762         int ret = 0;
 763 
 764         ite_dbg("%s called", __func__);
 765 
 766         /* read the interrupt flags */
 767         iflags = inb(dev->cir_addr + IT8708_C0IIR);
 768 
 769         if (iflags & IT85_TLDLI)
 770                 ret |= ITE_IRQ_TX_FIFO;
 771         if (iflags & IT85_RDAI)
 772                 ret |= ITE_IRQ_RX_FIFO;
 773         if (iflags & IT85_RFOI)
 774                 ret |= ITE_IRQ_RX_FIFO_OVERRUN;
 775 
 776         return ret;
 777 }
 778 
 779 /* set the carrier parameters; to be called with the spinlock held */
 780 static void it8708_set_carrier_params(struct ite_dev *dev, bool high_freq,
 781                                       bool use_demodulator,
 782                                       u8 carrier_freq_bits, u8 allowance_bits,
 783                                       u8 pulse_width_bits)
 784 {
 785         u8 val;
 786 
 787         ite_dbg("%s called", __func__);
 788 
 789         /* program the C0CFR register, with HRAE=1 */
 790         outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE,
 791                 dev->cir_addr + IT8708_BANKSEL);
 792 
 793         val = (inb(dev->cir_addr + IT8708_C0CFR)
 794                 & ~(IT85_HCFS | IT85_CFQ)) | carrier_freq_bits;
 795 
 796         if (high_freq)
 797                 val |= IT85_HCFS;
 798 
 799         outb(val, dev->cir_addr + IT8708_C0CFR);
 800 
 801         outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE,
 802                    dev->cir_addr + IT8708_BANKSEL);
 803 
 804         /* program the C0RCR register */
 805         val = inb(dev->cir_addr + IT8708_C0RCR)
 806                 & ~(IT85_RXEND | IT85_RXDCR);
 807 
 808         if (use_demodulator)
 809                 val |= IT85_RXEND;
 810 
 811         val |= allowance_bits;
 812 
 813         outb(val, dev->cir_addr + IT8708_C0RCR);
 814 
 815         /* program the C0TCR register */
 816         val = inb(dev->cir_addr + IT8708_C0TCR) & ~IT85_TXMPW;
 817         val |= pulse_width_bits;
 818         outb(val, dev->cir_addr + IT8708_C0TCR);
 819 }
 820 
 821 /* read up to buf_size bytes from the RX FIFO; to be called with the spinlock
 822  * held */
 823 static int it8708_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
 824 {
 825         int fifo, read = 0;
 826 
 827         ite_dbg("%s called", __func__);
 828 
 829         /* read how many bytes are still in the FIFO */
 830         fifo = inb(dev->cir_addr + IT8708_C0RFSR) & IT85_RXFBC;
 831 
 832         while (fifo > 0 && buf_size > 0) {
 833                 *(buf++) = inb(dev->cir_addr + IT8708_C0DR);
 834                 fifo--;
 835                 read++;
 836                 buf_size--;
 837         }
 838 
 839         return read;
 840 }
 841 
 842 /* return how many bytes are still in the FIFO; this will be called
 843  * with the device spinlock NOT HELD while waiting for the TX FIFO to get
 844  * empty; let's expect this won't be a problem */
 845 static int it8708_get_tx_used_slots(struct ite_dev *dev)
 846 {
 847         ite_dbg("%s called", __func__);
 848 
 849         return inb(dev->cir_addr + IT8708_C0TFSR) & IT85_TXFBC;
 850 }
 851 
 852 /* put a byte to the TX fifo; this should be called with the spinlock held */
 853 static void it8708_put_tx_byte(struct ite_dev *dev, u8 value)
 854 {
 855         outb(value, dev->cir_addr + IT8708_C0DR);
 856 }
 857 
 858 /* idle the receiver so that we won't receive samples until another
 859   pulse is detected; this must be called with the device spinlock held */
 860 static void it8708_idle_rx(struct ite_dev *dev)
 861 {
 862         ite_dbg("%s called", __func__);
 863 
 864         /* disable streaming by clearing RXACT writing it as 1 */
 865         outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXACT,
 866                 dev->cir_addr + IT8708_C0RCR);
 867 
 868         /* clear the FIFO */
 869         outb(inb(dev->cir_addr + IT8708_C0MSTCR) | IT85_FIFOCLR,
 870                 dev->cir_addr + IT8708_C0MSTCR);
 871 }
 872 
 873 /* disable the receiver; this must be called with the device spinlock held */
 874 static void it8708_disable_rx(struct ite_dev *dev)
 875 {
 876         ite_dbg("%s called", __func__);
 877 
 878         /* disable the receiver interrupts */
 879         outb(inb(dev->cir_addr + IT8708_C0IER) &
 880                 ~(IT85_RDAIE | IT85_RFOIE),
 881                 dev->cir_addr + IT8708_C0IER);
 882 
 883         /* disable the receiver */
 884         outb(inb(dev->cir_addr + IT8708_C0RCR) & ~IT85_RXEN,
 885                 dev->cir_addr + IT8708_C0RCR);
 886 
 887         /* clear the FIFO and RXACT (actually RXACT should have been cleared
 888          * in the previous outb() call) */
 889         it8708_idle_rx(dev);
 890 }
 891 
 892 /* enable the receiver; this must be called with the device spinlock held */
 893 static void it8708_enable_rx(struct ite_dev *dev)
 894 {
 895         ite_dbg("%s called", __func__);
 896 
 897         /* enable the receiver by setting RXEN */
 898         outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXEN,
 899                 dev->cir_addr + IT8708_C0RCR);
 900 
 901         /* just prepare it to idle for the next reception */
 902         it8708_idle_rx(dev);
 903 
 904         /* enable the receiver interrupts and master enable flag */
 905         outb(inb(dev->cir_addr + IT8708_C0IER)
 906                 |IT85_RDAIE | IT85_RFOIE | IT85_IEC,
 907                 dev->cir_addr + IT8708_C0IER);
 908 }
 909 
 910 /* disable the transmitter interrupt; this must be called with the device
 911  * spinlock held */
 912 static void it8708_disable_tx_interrupt(struct ite_dev *dev)
 913 {
 914         ite_dbg("%s called", __func__);
 915 
 916         /* disable the transmitter interrupts */
 917         outb(inb(dev->cir_addr + IT8708_C0IER) & ~IT85_TLDLIE,
 918                 dev->cir_addr + IT8708_C0IER);
 919 }
 920 
 921 /* enable the transmitter interrupt; this must be called with the device
 922  * spinlock held */
 923 static void it8708_enable_tx_interrupt(struct ite_dev *dev)
 924 {
 925         ite_dbg("%s called", __func__);
 926 
 927         /* enable the transmitter interrupts and master enable flag */
 928         outb(inb(dev->cir_addr + IT8708_C0IER)
 929                 |IT85_TLDLIE | IT85_IEC,
 930                 dev->cir_addr + IT8708_C0IER);
 931 }
 932 
 933 /* disable the device; this must be called with the device spinlock held */
 934 static void it8708_disable(struct ite_dev *dev)
 935 {
 936         ite_dbg("%s called", __func__);
 937 
 938         /* clear out all interrupt enable flags */
 939         outb(inb(dev->cir_addr + IT8708_C0IER) &
 940                 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE),
 941                 dev->cir_addr + IT8708_C0IER);
 942 
 943         /* disable the receiver */
 944         it8708_disable_rx(dev);
 945 
 946         /* erase the FIFO */
 947         outb(IT85_FIFOCLR | inb(dev->cir_addr + IT8708_C0MSTCR),
 948                 dev->cir_addr + IT8708_C0MSTCR);
 949 }
 950 
 951 /* initialize the hardware */
 952 static void it8708_init_hardware(struct ite_dev *dev)
 953 {
 954         ite_dbg("%s called", __func__);
 955 
 956         /* disable all the interrupts */
 957         outb(inb(dev->cir_addr + IT8708_C0IER) &
 958                 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE),
 959                 dev->cir_addr + IT8708_C0IER);
 960 
 961         /* program the baud rate divisor */
 962         outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE,
 963                 dev->cir_addr + IT8708_BANKSEL);
 964 
 965         outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT8708_C0BDLR);
 966         outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff,
 967                    dev->cir_addr + IT8708_C0BDHR);
 968 
 969         outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE,
 970                    dev->cir_addr + IT8708_BANKSEL);
 971 
 972         /* program the C0MSTCR register defaults */
 973         outb((inb(dev->cir_addr + IT8708_C0MSTCR) &
 974                         ~(IT85_ILSEL | IT85_ILE | IT85_FIFOTL |
 975                           IT85_FIFOCLR | IT85_RESET)) |
 976                        IT85_FIFOTL_DEFAULT,
 977                        dev->cir_addr + IT8708_C0MSTCR);
 978 
 979         /* program the C0RCR register defaults */
 980         outb((inb(dev->cir_addr + IT8708_C0RCR) &
 981                         ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND |
 982                           IT85_RXACT | IT85_RXDCR)) |
 983                        ITE_RXDCR_DEFAULT,
 984                        dev->cir_addr + IT8708_C0RCR);
 985 
 986         /* program the C0TCR register defaults */
 987         outb((inb(dev->cir_addr + IT8708_C0TCR) &
 988                         ~(IT85_TXMPM | IT85_TXMPW))
 989                        |IT85_TXRLE | IT85_TXENDF |
 990                        IT85_TXMPM_DEFAULT | IT85_TXMPW_DEFAULT,
 991                        dev->cir_addr + IT8708_C0TCR);
 992 
 993         /* program the carrier parameters */
 994         ite_set_carrier_params(dev);
 995 }
 996 
 997 /* IT8512F on ITE8709 HW-specific functions */
 998 
 999 /* read a byte from the SRAM module */
1000 static inline u8 it8709_rm(struct ite_dev *dev, int index)
1001 {
1002         outb(index, dev->cir_addr + IT8709_RAM_IDX);
1003         return inb(dev->cir_addr + IT8709_RAM_VAL);
1004 }
1005 
1006 /* write a byte to the SRAM module */
1007 static inline void it8709_wm(struct ite_dev *dev, u8 val, int index)
1008 {
1009         outb(index, dev->cir_addr + IT8709_RAM_IDX);
1010         outb(val, dev->cir_addr + IT8709_RAM_VAL);
1011 }
1012 
1013 static void it8709_wait(struct ite_dev *dev)
1014 {
1015         int i = 0;
1016         /*
1017          * loop until device tells it's ready to continue
1018          * iterations count is usually ~750 but can sometimes achieve 13000
1019          */
1020         for (i = 0; i < 15000; i++) {
1021                 udelay(2);
1022                 if (it8709_rm(dev, IT8709_MODE) == IT8709_IDLE)
1023                         break;
1024         }
1025 }
1026 
1027 /* read the value of a CIR register */
1028 static u8 it8709_rr(struct ite_dev *dev, int index)
1029 {
1030         /* just wait in case the previous access was a write */
1031         it8709_wait(dev);
1032         it8709_wm(dev, index, IT8709_REG_IDX);
1033         it8709_wm(dev, IT8709_READ, IT8709_MODE);
1034 
1035         /* wait for the read data to be available */
1036         it8709_wait(dev);
1037 
1038         /* return the read value */
1039         return it8709_rm(dev, IT8709_REG_VAL);
1040 }
1041 
1042 /* write the value of a CIR register */
1043 static void it8709_wr(struct ite_dev *dev, u8 val, int index)
1044 {
1045         /* we wait before writing, and not afterwards, since this allows us to
1046          * pipeline the host CPU with the microcontroller */
1047         it8709_wait(dev);
1048         it8709_wm(dev, val, IT8709_REG_VAL);
1049         it8709_wm(dev, index, IT8709_REG_IDX);
1050         it8709_wm(dev, IT8709_WRITE, IT8709_MODE);
1051 }
1052 
1053 /* retrieve a bitmask of the current causes for a pending interrupt; this may
1054  * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN
1055  * */
1056 static int it8709_get_irq_causes(struct ite_dev *dev)
1057 {
1058         u8 iflags;
1059         int ret = 0;
1060 
1061         ite_dbg("%s called", __func__);
1062 
1063         /* read the interrupt flags */
1064         iflags = it8709_rm(dev, IT8709_IIR);
1065 
1066         if (iflags & IT85_TLDLI)
1067                 ret |= ITE_IRQ_TX_FIFO;
1068         if (iflags & IT85_RDAI)
1069                 ret |= ITE_IRQ_RX_FIFO;
1070         if (iflags & IT85_RFOI)
1071                 ret |= ITE_IRQ_RX_FIFO_OVERRUN;
1072 
1073         return ret;
1074 }
1075 
1076 /* set the carrier parameters; to be called with the spinlock held */
1077 static void it8709_set_carrier_params(struct ite_dev *dev, bool high_freq,
1078                                       bool use_demodulator,
1079                                       u8 carrier_freq_bits, u8 allowance_bits,
1080                                       u8 pulse_width_bits)
1081 {
1082         u8 val;
1083 
1084         ite_dbg("%s called", __func__);
1085 
1086         val = (it8709_rr(dev, IT85_C0CFR)
1087                      &~(IT85_HCFS | IT85_CFQ)) |
1088             carrier_freq_bits;
1089 
1090         if (high_freq)
1091                 val |= IT85_HCFS;
1092 
1093         it8709_wr(dev, val, IT85_C0CFR);
1094 
1095         /* program the C0RCR register */
1096         val = it8709_rr(dev, IT85_C0RCR)
1097                 & ~(IT85_RXEND | IT85_RXDCR);
1098 
1099         if (use_demodulator)
1100                 val |= IT85_RXEND;
1101 
1102         val |= allowance_bits;
1103 
1104         it8709_wr(dev, val, IT85_C0RCR);
1105 
1106         /* program the C0TCR register */
1107         val = it8709_rr(dev, IT85_C0TCR) & ~IT85_TXMPW;
1108         val |= pulse_width_bits;
1109         it8709_wr(dev, val, IT85_C0TCR);
1110 }
1111 
1112 /* read up to buf_size bytes from the RX FIFO; to be called with the spinlock
1113  * held */
1114 static int it8709_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
1115 {
1116         int fifo, read = 0;
1117 
1118         ite_dbg("%s called", __func__);
1119 
1120         /* read how many bytes are still in the FIFO */
1121         fifo = it8709_rm(dev, IT8709_RFSR) & IT85_RXFBC;
1122 
1123         while (fifo > 0 && buf_size > 0) {
1124                 *(buf++) = it8709_rm(dev, IT8709_FIFO + read);
1125                 fifo--;
1126                 read++;
1127                 buf_size--;
1128         }
1129 
1130         /* 'clear' the FIFO by setting the writing index to 0; this is
1131          * completely bound to be racy, but we can't help it, since it's a
1132          * limitation of the protocol */
1133         it8709_wm(dev, 0, IT8709_RFSR);
1134 
1135         return read;
1136 }
1137 
1138 /* return how many bytes are still in the FIFO; this will be called
1139  * with the device spinlock NOT HELD while waiting for the TX FIFO to get
1140  * empty; let's expect this won't be a problem */
1141 static int it8709_get_tx_used_slots(struct ite_dev *dev)
1142 {
1143         ite_dbg("%s called", __func__);
1144 
1145         return it8709_rr(dev, IT85_C0TFSR) & IT85_TXFBC;
1146 }
1147 
1148 /* put a byte to the TX fifo; this should be called with the spinlock held */
1149 static void it8709_put_tx_byte(struct ite_dev *dev, u8 value)
1150 {
1151         it8709_wr(dev, value, IT85_C0DR);
1152 }
1153 
1154 /* idle the receiver so that we won't receive samples until another
1155   pulse is detected; this must be called with the device spinlock held */
1156 static void it8709_idle_rx(struct ite_dev *dev)
1157 {
1158         ite_dbg("%s called", __func__);
1159 
1160         /* disable streaming by clearing RXACT writing it as 1 */
1161         it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXACT,
1162                             IT85_C0RCR);
1163 
1164         /* clear the FIFO */
1165         it8709_wr(dev, it8709_rr(dev, IT85_C0MSTCR) | IT85_FIFOCLR,
1166                             IT85_C0MSTCR);
1167 }
1168 
1169 /* disable the receiver; this must be called with the device spinlock held */
1170 static void it8709_disable_rx(struct ite_dev *dev)
1171 {
1172         ite_dbg("%s called", __func__);
1173 
1174         /* disable the receiver interrupts */
1175         it8709_wr(dev, it8709_rr(dev, IT85_C0IER) &
1176                             ~(IT85_RDAIE | IT85_RFOIE),
1177                             IT85_C0IER);
1178 
1179         /* disable the receiver */
1180         it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) & ~IT85_RXEN,
1181                             IT85_C0RCR);
1182 
1183         /* clear the FIFO and RXACT (actually RXACT should have been cleared
1184          * in the previous it8709_wr(dev, ) call) */
1185         it8709_idle_rx(dev);
1186 }
1187 
1188 /* enable the receiver; this must be called with the device spinlock held */
1189 static void it8709_enable_rx(struct ite_dev *dev)
1190 {
1191         ite_dbg("%s called", __func__);
1192 
1193         /* enable the receiver by setting RXEN */
1194         it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXEN,
1195                             IT85_C0RCR);
1196 
1197         /* just prepare it to idle for the next reception */
1198         it8709_idle_rx(dev);
1199 
1200         /* enable the receiver interrupts and master enable flag */
1201         it8709_wr(dev, it8709_rr(dev, IT85_C0IER)
1202                             |IT85_RDAIE | IT85_RFOIE | IT85_IEC,
1203                             IT85_C0IER);
1204 }
1205 
1206 /* disable the transmitter interrupt; this must be called with the device
1207  * spinlock held */
1208 static void it8709_disable_tx_interrupt(struct ite_dev *dev)
1209 {
1210         ite_dbg("%s called", __func__);
1211 
1212         /* disable the transmitter interrupts */
1213         it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & ~IT85_TLDLIE,
1214                             IT85_C0IER);
1215 }
1216 
1217 /* enable the transmitter interrupt; this must be called with the device
1218  * spinlock held */
1219 static void it8709_enable_tx_interrupt(struct ite_dev *dev)
1220 {
1221         ite_dbg("%s called", __func__);
1222 
1223         /* enable the transmitter interrupts and master enable flag */
1224         it8709_wr(dev, it8709_rr(dev, IT85_C0IER)
1225                             |IT85_TLDLIE | IT85_IEC,
1226                             IT85_C0IER);
1227 }
1228 
1229 /* disable the device; this must be called with the device spinlock held */
1230 static void it8709_disable(struct ite_dev *dev)
1231 {
1232         ite_dbg("%s called", __func__);
1233 
1234         /* clear out all interrupt enable flags */
1235         it8709_wr(dev, it8709_rr(dev, IT85_C0IER) &
1236                         ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE),
1237                   IT85_C0IER);
1238 
1239         /* disable the receiver */
1240         it8709_disable_rx(dev);
1241 
1242         /* erase the FIFO */
1243         it8709_wr(dev, IT85_FIFOCLR | it8709_rr(dev, IT85_C0MSTCR),
1244                             IT85_C0MSTCR);
1245 }
1246 
1247 /* initialize the hardware */
1248 static void it8709_init_hardware(struct ite_dev *dev)
1249 {
1250         ite_dbg("%s called", __func__);
1251 
1252         /* disable all the interrupts */
1253         it8709_wr(dev, it8709_rr(dev, IT85_C0IER) &
1254                         ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE),
1255                   IT85_C0IER);
1256 
1257         /* program the baud rate divisor */
1258         it8709_wr(dev, ITE_BAUDRATE_DIVISOR & 0xff, IT85_C0BDLR);
1259         it8709_wr(dev, (ITE_BAUDRATE_DIVISOR >> 8) & 0xff,
1260                         IT85_C0BDHR);
1261 
1262         /* program the C0MSTCR register defaults */
1263         it8709_wr(dev, (it8709_rr(dev, IT85_C0MSTCR) &
1264                         ~(IT85_ILSEL | IT85_ILE | IT85_FIFOTL
1265                           | IT85_FIFOCLR | IT85_RESET)) | IT85_FIFOTL_DEFAULT,
1266                   IT85_C0MSTCR);
1267 
1268         /* program the C0RCR register defaults */
1269         it8709_wr(dev, (it8709_rr(dev, IT85_C0RCR) &
1270                         ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND | IT85_RXACT
1271                           | IT85_RXDCR)) | ITE_RXDCR_DEFAULT,
1272                   IT85_C0RCR);
1273 
1274         /* program the C0TCR register defaults */
1275         it8709_wr(dev, (it8709_rr(dev, IT85_C0TCR) & ~(IT85_TXMPM | IT85_TXMPW))
1276                         | IT85_TXRLE | IT85_TXENDF | IT85_TXMPM_DEFAULT
1277                         | IT85_TXMPW_DEFAULT,
1278                   IT85_C0TCR);
1279 
1280         /* program the carrier parameters */
1281         ite_set_carrier_params(dev);
1282 }
1283 
1284 
1285 /* generic hardware setup/teardown code */
1286 
1287 /* activate the device for use */
1288 static int ite_open(struct rc_dev *rcdev)
1289 {
1290         struct ite_dev *dev = rcdev->priv;
1291         unsigned long flags;
1292 
1293         ite_dbg("%s called", __func__);
1294 
1295         spin_lock_irqsave(&dev->lock, flags);
1296         dev->in_use = true;
1297 
1298         /* enable the receiver */
1299         dev->params.enable_rx(dev);
1300 
1301         spin_unlock_irqrestore(&dev->lock, flags);
1302 
1303         return 0;
1304 }
1305 
1306 /* deactivate the device for use */
1307 static void ite_close(struct rc_dev *rcdev)
1308 {
1309         struct ite_dev *dev = rcdev->priv;
1310         unsigned long flags;
1311 
1312         ite_dbg("%s called", __func__);
1313 
1314         spin_lock_irqsave(&dev->lock, flags);
1315         dev->in_use = false;
1316 
1317         /* wait for any transmission to end */
1318         spin_unlock_irqrestore(&dev->lock, flags);
1319         wait_event_interruptible(dev->tx_ended, !dev->transmitting);
1320         spin_lock_irqsave(&dev->lock, flags);
1321 
1322         dev->params.disable(dev);
1323 
1324         spin_unlock_irqrestore(&dev->lock, flags);
1325 }
1326 
1327 /* supported models and their parameters */
1328 static const struct ite_dev_params ite_dev_descs[] = {
1329         {       /* 0: ITE8704 */
1330                .model = "ITE8704 CIR transceiver",
1331                .io_region_size = IT87_IOREG_LENGTH,
1332                .io_rsrc_no = 0,
1333                .hw_tx_capable = true,
1334                .sample_period = (u32) (1000000000ULL / 115200),
1335                .tx_carrier_freq = 38000,
1336                .tx_duty_cycle = 33,
1337                .rx_low_carrier_freq = 0,
1338                .rx_high_carrier_freq = 0,
1339 
1340                 /* operations */
1341                .get_irq_causes = it87_get_irq_causes,
1342                .enable_rx = it87_enable_rx,
1343                .idle_rx = it87_idle_rx,
1344                .disable_rx = it87_idle_rx,
1345                .get_rx_bytes = it87_get_rx_bytes,
1346                .enable_tx_interrupt = it87_enable_tx_interrupt,
1347                .disable_tx_interrupt = it87_disable_tx_interrupt,
1348                .get_tx_used_slots = it87_get_tx_used_slots,
1349                .put_tx_byte = it87_put_tx_byte,
1350                .disable = it87_disable,
1351                .init_hardware = it87_init_hardware,
1352                .set_carrier_params = it87_set_carrier_params,
1353                },
1354         {       /* 1: ITE8713 */
1355                .model = "ITE8713 CIR transceiver",
1356                .io_region_size = IT87_IOREG_LENGTH,
1357                .io_rsrc_no = 0,
1358                .hw_tx_capable = true,
1359                .sample_period = (u32) (1000000000ULL / 115200),
1360                .tx_carrier_freq = 38000,
1361                .tx_duty_cycle = 33,
1362                .rx_low_carrier_freq = 0,
1363                .rx_high_carrier_freq = 0,
1364 
1365                 /* operations */
1366                .get_irq_causes = it87_get_irq_causes,
1367                .enable_rx = it87_enable_rx,
1368                .idle_rx = it87_idle_rx,
1369                .disable_rx = it87_idle_rx,
1370                .get_rx_bytes = it87_get_rx_bytes,
1371                .enable_tx_interrupt = it87_enable_tx_interrupt,
1372                .disable_tx_interrupt = it87_disable_tx_interrupt,
1373                .get_tx_used_slots = it87_get_tx_used_slots,
1374                .put_tx_byte = it87_put_tx_byte,
1375                .disable = it87_disable,
1376                .init_hardware = it87_init_hardware,
1377                .set_carrier_params = it87_set_carrier_params,
1378                },
1379         {       /* 2: ITE8708 */
1380                .model = "ITE8708 CIR transceiver",
1381                .io_region_size = IT8708_IOREG_LENGTH,
1382                .io_rsrc_no = 0,
1383                .hw_tx_capable = true,
1384                .sample_period = (u32) (1000000000ULL / 115200),
1385                .tx_carrier_freq = 38000,
1386                .tx_duty_cycle = 33,
1387                .rx_low_carrier_freq = 0,
1388                .rx_high_carrier_freq = 0,
1389 
1390                 /* operations */
1391                .get_irq_causes = it8708_get_irq_causes,
1392                .enable_rx = it8708_enable_rx,
1393                .idle_rx = it8708_idle_rx,
1394                .disable_rx = it8708_idle_rx,
1395                .get_rx_bytes = it8708_get_rx_bytes,
1396                .enable_tx_interrupt = it8708_enable_tx_interrupt,
1397                .disable_tx_interrupt =
1398                it8708_disable_tx_interrupt,
1399                .get_tx_used_slots = it8708_get_tx_used_slots,
1400                .put_tx_byte = it8708_put_tx_byte,
1401                .disable = it8708_disable,
1402                .init_hardware = it8708_init_hardware,
1403                .set_carrier_params = it8708_set_carrier_params,
1404                },
1405         {       /* 3: ITE8709 */
1406                .model = "ITE8709 CIR transceiver",
1407                .io_region_size = IT8709_IOREG_LENGTH,
1408                .io_rsrc_no = 2,
1409                .hw_tx_capable = true,
1410                .sample_period = (u32) (1000000000ULL / 115200),
1411                .tx_carrier_freq = 38000,
1412                .tx_duty_cycle = 33,
1413                .rx_low_carrier_freq = 0,
1414                .rx_high_carrier_freq = 0,
1415 
1416                 /* operations */
1417                .get_irq_causes = it8709_get_irq_causes,
1418                .enable_rx = it8709_enable_rx,
1419                .idle_rx = it8709_idle_rx,
1420                .disable_rx = it8709_idle_rx,
1421                .get_rx_bytes = it8709_get_rx_bytes,
1422                .enable_tx_interrupt = it8709_enable_tx_interrupt,
1423                .disable_tx_interrupt =
1424                it8709_disable_tx_interrupt,
1425                .get_tx_used_slots = it8709_get_tx_used_slots,
1426                .put_tx_byte = it8709_put_tx_byte,
1427                .disable = it8709_disable,
1428                .init_hardware = it8709_init_hardware,
1429                .set_carrier_params = it8709_set_carrier_params,
1430                },
1431 };
1432 
1433 static const struct pnp_device_id ite_ids[] = {
1434         {"ITE8704", 0},         /* Default model */
1435         {"ITE8713", 1},         /* CIR found in EEEBox 1501U */
1436         {"ITE8708", 2},         /* Bridged IT8512 */
1437         {"ITE8709", 3},         /* SRAM-Bridged IT8512 */
1438         {"", 0},
1439 };
1440 
1441 /* allocate memory, probe hardware, and initialize everything */
1442 static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id
1443                      *dev_id)
1444 {
1445         const struct ite_dev_params *dev_desc = NULL;
1446         struct ite_dev *itdev = NULL;
1447         struct rc_dev *rdev = NULL;
1448         int ret = -ENOMEM;
1449         int model_no;
1450         int io_rsrc_no;
1451 
1452         ite_dbg("%s called", __func__);
1453 
1454         itdev = kzalloc(sizeof(struct ite_dev), GFP_KERNEL);
1455         if (!itdev)
1456                 return ret;
1457 
1458         /* input device for IR remote (and tx) */
1459         rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
1460         if (!rdev)
1461                 goto exit_free_dev_rdev;
1462         itdev->rdev = rdev;
1463 
1464         ret = -ENODEV;
1465 
1466         /* get the model number */
1467         model_no = (int)dev_id->driver_data;
1468         ite_pr(KERN_NOTICE, "Auto-detected model: %s\n",
1469                 ite_dev_descs[model_no].model);
1470 
1471         if (model_number >= 0 && model_number < ARRAY_SIZE(ite_dev_descs)) {
1472                 model_no = model_number;
1473                 ite_pr(KERN_NOTICE, "The model has been fixed by a module parameter.");
1474         }
1475 
1476         ite_pr(KERN_NOTICE, "Using model: %s\n", ite_dev_descs[model_no].model);
1477 
1478         /* get the description for the device */
1479         dev_desc = &ite_dev_descs[model_no];
1480         io_rsrc_no = dev_desc->io_rsrc_no;
1481 
1482         /* validate pnp resources */
1483         if (!pnp_port_valid(pdev, io_rsrc_no) ||
1484             pnp_port_len(pdev, io_rsrc_no) != dev_desc->io_region_size) {
1485                 dev_err(&pdev->dev, "IR PNP Port not valid!\n");
1486                 goto exit_free_dev_rdev;
1487         }
1488 
1489         if (!pnp_irq_valid(pdev, 0)) {
1490                 dev_err(&pdev->dev, "PNP IRQ not valid!\n");
1491                 goto exit_free_dev_rdev;
1492         }
1493 
1494         /* store resource values */
1495         itdev->cir_addr = pnp_port_start(pdev, io_rsrc_no);
1496         itdev->cir_irq = pnp_irq(pdev, 0);
1497 
1498         /* initialize spinlocks */
1499         spin_lock_init(&itdev->lock);
1500 
1501         /* set driver data into the pnp device */
1502         pnp_set_drvdata(pdev, itdev);
1503         itdev->pdev = pdev;
1504 
1505         /* initialize waitqueues for transmission */
1506         init_waitqueue_head(&itdev->tx_queue);
1507         init_waitqueue_head(&itdev->tx_ended);
1508 
1509         /* copy model-specific parameters */
1510         itdev->params = *dev_desc;
1511 
1512         /* apply any overrides */
1513         if (sample_period > 0)
1514                 itdev->params.sample_period = sample_period;
1515 
1516         if (tx_carrier_freq > 0)
1517                 itdev->params.tx_carrier_freq = tx_carrier_freq;
1518 
1519         if (tx_duty_cycle > 0 && tx_duty_cycle <= 100)
1520                 itdev->params.tx_duty_cycle = tx_duty_cycle;
1521 
1522         if (rx_low_carrier_freq > 0)
1523                 itdev->params.rx_low_carrier_freq = rx_low_carrier_freq;
1524 
1525         if (rx_high_carrier_freq > 0)
1526                 itdev->params.rx_high_carrier_freq = rx_high_carrier_freq;
1527 
1528         /* print out parameters */
1529         ite_pr(KERN_NOTICE, "TX-capable: %d\n", (int)
1530                          itdev->params.hw_tx_capable);
1531         ite_pr(KERN_NOTICE, "Sample period (ns): %ld\n", (long)
1532                      itdev->params.sample_period);
1533         ite_pr(KERN_NOTICE, "TX carrier frequency (Hz): %d\n", (int)
1534                      itdev->params.tx_carrier_freq);
1535         ite_pr(KERN_NOTICE, "TX duty cycle (%%): %d\n", (int)
1536                      itdev->params.tx_duty_cycle);
1537         ite_pr(KERN_NOTICE, "RX low carrier frequency (Hz): %d\n", (int)
1538                      itdev->params.rx_low_carrier_freq);
1539         ite_pr(KERN_NOTICE, "RX high carrier frequency (Hz): %d\n", (int)
1540                      itdev->params.rx_high_carrier_freq);
1541 
1542         /* set up hardware initial state */
1543         itdev->params.init_hardware(itdev);
1544 
1545         /* set up ir-core props */
1546         rdev->priv = itdev;
1547         rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
1548         rdev->open = ite_open;
1549         rdev->close = ite_close;
1550         rdev->s_idle = ite_s_idle;
1551         rdev->s_rx_carrier_range = ite_set_rx_carrier_range;
1552         /* FIFO threshold is 17 bytes, so 17 * 8 samples minimum */
1553         rdev->min_timeout = 17 * 8 * ITE_BAUDRATE_DIVISOR *
1554                             itdev->params.sample_period;
1555         rdev->timeout = IR_DEFAULT_TIMEOUT;
1556         rdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
1557         rdev->rx_resolution = ITE_BAUDRATE_DIVISOR *
1558                                 itdev->params.sample_period;
1559         rdev->tx_resolution = ITE_BAUDRATE_DIVISOR *
1560                                 itdev->params.sample_period;
1561 
1562         /* set up transmitter related values if needed */
1563         if (itdev->params.hw_tx_capable) {
1564                 rdev->tx_ir = ite_tx_ir;
1565                 rdev->s_tx_carrier = ite_set_tx_carrier;
1566                 rdev->s_tx_duty_cycle = ite_set_tx_duty_cycle;
1567         }
1568 
1569         rdev->device_name = dev_desc->model;
1570         rdev->input_id.bustype = BUS_HOST;
1571         rdev->input_id.vendor = PCI_VENDOR_ID_ITE;
1572         rdev->input_id.product = 0;
1573         rdev->input_id.version = 0;
1574         rdev->driver_name = ITE_DRIVER_NAME;
1575         rdev->map_name = RC_MAP_RC6_MCE;
1576 
1577         ret = rc_register_device(rdev);
1578         if (ret)
1579                 goto exit_free_dev_rdev;
1580 
1581         ret = -EBUSY;
1582         /* now claim resources */
1583         if (!request_region(itdev->cir_addr,
1584                                 dev_desc->io_region_size, ITE_DRIVER_NAME))
1585                 goto exit_unregister_device;
1586 
1587         if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED,
1588                         ITE_DRIVER_NAME, (void *)itdev))
1589                 goto exit_release_cir_addr;
1590 
1591         ite_pr(KERN_NOTICE, "driver has been successfully loaded\n");
1592 
1593         return 0;
1594 
1595 exit_release_cir_addr:
1596         release_region(itdev->cir_addr, itdev->params.io_region_size);
1597 exit_unregister_device:
1598         rc_unregister_device(rdev);
1599         rdev = NULL;
1600 exit_free_dev_rdev:
1601         rc_free_device(rdev);
1602         kfree(itdev);
1603 
1604         return ret;
1605 }
1606 
1607 static void ite_remove(struct pnp_dev *pdev)
1608 {
1609         struct ite_dev *dev = pnp_get_drvdata(pdev);
1610         unsigned long flags;
1611 
1612         ite_dbg("%s called", __func__);
1613 
1614         spin_lock_irqsave(&dev->lock, flags);
1615 
1616         /* disable hardware */
1617         dev->params.disable(dev);
1618 
1619         spin_unlock_irqrestore(&dev->lock, flags);
1620 
1621         /* free resources */
1622         free_irq(dev->cir_irq, dev);
1623         release_region(dev->cir_addr, dev->params.io_region_size);
1624 
1625         rc_unregister_device(dev->rdev);
1626 
1627         kfree(dev);
1628 }
1629 
1630 static int ite_suspend(struct pnp_dev *pdev, pm_message_t state)
1631 {
1632         struct ite_dev *dev = pnp_get_drvdata(pdev);
1633         unsigned long flags;
1634 
1635         ite_dbg("%s called", __func__);
1636 
1637         /* wait for any transmission to end */
1638         wait_event_interruptible(dev->tx_ended, !dev->transmitting);
1639 
1640         spin_lock_irqsave(&dev->lock, flags);
1641 
1642         /* disable all interrupts */
1643         dev->params.disable(dev);
1644 
1645         spin_unlock_irqrestore(&dev->lock, flags);
1646 
1647         return 0;
1648 }
1649 
1650 static int ite_resume(struct pnp_dev *pdev)
1651 {
1652         struct ite_dev *dev = pnp_get_drvdata(pdev);
1653         unsigned long flags;
1654 
1655         ite_dbg("%s called", __func__);
1656 
1657         spin_lock_irqsave(&dev->lock, flags);
1658 
1659         /* reinitialize hardware config registers */
1660         dev->params.init_hardware(dev);
1661         /* enable the receiver */
1662         dev->params.enable_rx(dev);
1663 
1664         spin_unlock_irqrestore(&dev->lock, flags);
1665 
1666         return 0;
1667 }
1668 
1669 static void ite_shutdown(struct pnp_dev *pdev)
1670 {
1671         struct ite_dev *dev = pnp_get_drvdata(pdev);
1672         unsigned long flags;
1673 
1674         ite_dbg("%s called", __func__);
1675 
1676         spin_lock_irqsave(&dev->lock, flags);
1677 
1678         /* disable all interrupts */
1679         dev->params.disable(dev);
1680 
1681         spin_unlock_irqrestore(&dev->lock, flags);
1682 }
1683 
1684 static struct pnp_driver ite_driver = {
1685         .name           = ITE_DRIVER_NAME,
1686         .id_table       = ite_ids,
1687         .probe          = ite_probe,
1688         .remove         = ite_remove,
1689         .suspend        = ite_suspend,
1690         .resume         = ite_resume,
1691         .shutdown       = ite_shutdown,
1692 };
1693 
1694 MODULE_DEVICE_TABLE(pnp, ite_ids);
1695 MODULE_DESCRIPTION("ITE Tech Inc. IT8712F/ITE8512F CIR driver");
1696 
1697 MODULE_AUTHOR("Juan J. Garcia de Soria <skandalfo@gmail.com>");
1698 MODULE_LICENSE("GPL");
1699 
1700 module_pnp_driver(ite_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/rc/ite-cir.c

DEFINITIONS
