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Merge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...
[deliverable/linux.git] / drivers / media / rc / ite-cir.c
CommitLineData
620a32bb
JGS		 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/slab.h>
40#include <linux/input.h>
41#include <linux/bitops.h>
42#include <media/rc-core.h>
43#include <linux/pci_ids.h>
44
45#include "ite-cir.h"
46
47/* module parameters */
48
49/* debug level */
50static int debug;
51module_param(debug, int, S_IRUGO | S_IWUSR);
52MODULE_PARM_DESC(debug, "Enable debugging output");
53
54/* low limit for RX carrier freq, Hz, 0 for no RX demodulation */
55static int rx_low_carrier_freq;
56module_param(rx_low_carrier_freq, int, S_IRUGO | S_IWUSR);
57MODULE_PARM_DESC(rx_low_carrier_freq, "Override low RX carrier frequency, Hz, "
58 "0 for no RX demodulation");
59
60/* high limit for RX carrier freq, Hz, 0 for no RX demodulation */
61static int rx_high_carrier_freq;
62module_param(rx_high_carrier_freq, int, S_IRUGO | S_IWUSR);
63MODULE_PARM_DESC(rx_high_carrier_freq, "Override high RX carrier frequency, "
64 "Hz, 0 for no RX demodulation");
65
66/* override tx carrier frequency */
67static int tx_carrier_freq;
68module_param(tx_carrier_freq, int, S_IRUGO | S_IWUSR);
69MODULE_PARM_DESC(tx_carrier_freq, "Override TX carrier frequency, Hz");
70
71/* override tx duty cycle */
72static int tx_duty_cycle;
73module_param(tx_duty_cycle, int, S_IRUGO | S_IWUSR);
74MODULE_PARM_DESC(tx_duty_cycle, "Override TX duty cycle, 1-100");
75
76/* override default sample period */
77static long sample_period;
78module_param(sample_period, long, S_IRUGO | S_IWUSR);
79MODULE_PARM_DESC(sample_period, "Override carrier sample period, us");
80
81/* override detected model id */
82static int model_number = -1;
83module_param(model_number, int, S_IRUGO | S_IWUSR);
84MODULE_PARM_DESC(model_number, "Use this model number, don't autodetect");
85
86
87/* HW-independent code functions */
88
89/* check whether carrier frequency is high frequency */
90static inline bool ite_is_high_carrier_freq(unsigned int freq)
91{
92 return freq >= ITE_HCF_MIN_CARRIER_FREQ;
93}
94
95/* get the bits required to program the carrier frequency in CFQ bits,
96 * unshifted */
97static u8 ite_get_carrier_freq_bits(unsigned int freq)
98{
99 if (ite_is_high_carrier_freq(freq)) {
100 if (freq < 425000)
101 return ITE_CFQ_400;
102
103 else if (freq < 465000)
104 return ITE_CFQ_450;
105
106 else if (freq < 490000)
107 return ITE_CFQ_480;
108
109 else
110 return ITE_CFQ_500;
111 } else {
112 /* trim to limits */
113 if (freq < ITE_LCF_MIN_CARRIER_FREQ)
114 freq = ITE_LCF_MIN_CARRIER_FREQ;
115 if (freq > ITE_LCF_MAX_CARRIER_FREQ)
116 freq = ITE_LCF_MAX_CARRIER_FREQ;
117
118 /* convert to kHz and subtract the base freq */
119 freq =
120 DIV_ROUND_CLOSEST(freq - ITE_LCF_MIN_CARRIER_FREQ,
121 1000);
122
123 return (u8) freq;
124 }
125}
126
127/* get the bits required to program the pulse with in TXMPW */
128static u8 ite_get_pulse_width_bits(unsigned int freq, int duty_cycle)
129{
130 unsigned long period_ns, on_ns;
131
132 /* sanitize freq into range */
133 if (freq < ITE_LCF_MIN_CARRIER_FREQ)
134 freq = ITE_LCF_MIN_CARRIER_FREQ;
135 if (freq > ITE_HCF_MAX_CARRIER_FREQ)
136 freq = ITE_HCF_MAX_CARRIER_FREQ;
137
138 period_ns = 1000000000UL / freq;
139 on_ns = period_ns * duty_cycle / 100;
140
141 if (ite_is_high_carrier_freq(freq)) {
142 if (on_ns < 750)
143 return ITE_TXMPW_A;
144
145 else if (on_ns < 850)
146 return ITE_TXMPW_B;
147
148 else if (on_ns < 950)
149 return ITE_TXMPW_C;
150
151 else if (on_ns < 1080)
152 return ITE_TXMPW_D;
153
154 else
155 return ITE_TXMPW_E;
156 } else {
157 if (on_ns < 6500)
158 return ITE_TXMPW_A;
159
160 else if (on_ns < 7850)
161 return ITE_TXMPW_B;
162
163 else if (on_ns < 9650)
164 return ITE_TXMPW_C;
165
166 else if (on_ns < 11950)
167 return ITE_TXMPW_D;
168
169 else
170 return ITE_TXMPW_E;
171 }
172}
173
174/* decode raw bytes as received by the hardware, and push them to the ir-core
175 * layer */
176static void ite_decode_bytes(struct ite_dev *dev, const u8 * data, int
177 length)
178{
179 u32 sample_period;
180 unsigned long *ldata;
181 unsigned int next_one, next_zero, size;
182 DEFINE_IR_RAW_EVENT(ev);
183
184 if (length == 0)
185 return;
186
187 sample_period = dev->params.sample_period;
188 ldata = (unsigned long *)data;
189 size = length << 3;
190 next_one = generic_find_next_le_bit(ldata, size, 0);
191 if (next_one > 0) {
192 ev.pulse = true;
193 ev.duration =
194 ITE_BITS_TO_NS(next_one, sample_period);
195 ir_raw_event_store_with_filter(dev->rdev, &ev);
196 }
197
198 while (next_one < size) {
199 next_zero = generic_find_next_zero_le_bit(ldata, size, next_one + 1);
200 ev.pulse = false;
201 ev.duration = ITE_BITS_TO_NS(next_zero - next_one, sample_period);
202 ir_raw_event_store_with_filter(dev->rdev, &ev);
203
204 if (next_zero < size) {
205 next_one =
206 generic_find_next_le_bit(ldata,
207 size,
208 next_zero + 1);
209 ev.pulse = true;
210 ev.duration =
211 ITE_BITS_TO_NS(next_one - next_zero,
212 sample_period);
213 ir_raw_event_store_with_filter
214 (dev->rdev, &ev);
215 } else
216 next_one = size;
217 }
218
219 ir_raw_event_handle(dev->rdev);
220
221 ite_dbg_verbose("decoded %d bytes.", length);
222}
223
224/* set all the rx/tx carrier parameters; this must be called with the device
225 * spinlock held */
226static void ite_set_carrier_params(struct ite_dev *dev)
227{
228 unsigned int freq, low_freq, high_freq;
229 int allowance;
230 bool use_demodulator;
231 bool for_tx = dev->transmitting;
232
233 ite_dbg("%s called", __func__);
234
235 if (for_tx) {
236 /* we don't need no stinking calculations */
237 freq = dev->params.tx_carrier_freq;
238 allowance = ITE_RXDCR_DEFAULT;
239 use_demodulator = false;
240 } else {
241 low_freq = dev->params.rx_low_carrier_freq;
242 high_freq = dev->params.rx_high_carrier_freq;
243
244 if (low_freq == 0) {
245 /* don't demodulate */
246 freq =
247 ITE_DEFAULT_CARRIER_FREQ;
248 allowance = ITE_RXDCR_DEFAULT;
249 use_demodulator = false;
250 } else {
251 /* calculate the middle freq */
252 freq = (low_freq + high_freq) / 2;
253
254 /* calculate the allowance */
255 allowance =
256 DIV_ROUND_CLOSEST(10000 * (high_freq - low_freq),
257 ITE_RXDCR_PER_10000_STEP
258 * (high_freq + low_freq));
259
260 if (allowance < 1)
261 allowance = 1;
262
263 if (allowance > ITE_RXDCR_MAX)
264 allowance = ITE_RXDCR_MAX;
265 }
266 }
267
268 /* set the carrier parameters in a device-dependent way */
269 dev->params.set_carrier_params(dev, ite_is_high_carrier_freq(freq),
270 use_demodulator, ite_get_carrier_freq_bits(freq), allowance,
271 ite_get_pulse_width_bits(freq, dev->params.tx_duty_cycle));
272}
273
274/* interrupt service routine for incoming and outgoing CIR data */
275static irqreturn_t ite_cir_isr(int irq, void *data)
276{
277 struct ite_dev *dev = data;
278 unsigned long flags;
279 irqreturn_t ret = IRQ_RETVAL(IRQ_NONE);
280 u8 rx_buf[ITE_RX_FIFO_LEN];
281 int rx_bytes;
282 int iflags;
283
284 ite_dbg_verbose("%s firing", __func__);
285
286 /* grab the spinlock */
287 spin_lock_irqsave(&dev->lock, flags);
288
289 /* read the interrupt flags */
290 iflags = dev->params.get_irq_causes(dev);
291
292 /* check for the receive interrupt */
293 if (iflags & (ITE_IRQ_RX_FIFO | ITE_IRQ_RX_FIFO_OVERRUN)) {
294 /* read the FIFO bytes */
295 rx_bytes =
296 dev->params.get_rx_bytes(dev, rx_buf,
297 ITE_RX_FIFO_LEN);
298
299 if (rx_bytes > 0) {
300 /* drop the spinlock, since the ir-core layer
301 * may call us back again through
302 * ite_s_idle() */
303 spin_unlock_irqrestore(&dev->
304 lock,
305 flags);
306
307 /* decode the data we've just received */
308 ite_decode_bytes(dev, rx_buf,
309 rx_bytes);
310
311 /* reacquire the spinlock */
312 spin_lock_irqsave(&dev->lock,
313 flags);
314
315 /* mark the interrupt as serviced */
316 ret = IRQ_RETVAL(IRQ_HANDLED);
317 }
318 } else if (iflags & ITE_IRQ_TX_FIFO) {
319 /* FIFO space available interrupt */
320 ite_dbg_verbose("got interrupt for TX FIFO");
321
322 /* wake any sleeping transmitter */
323 wake_up_interruptible(&dev->tx_queue);
324
325 /* mark the interrupt as serviced */
326 ret = IRQ_RETVAL(IRQ_HANDLED);
327 }
328
329 /* drop the spinlock */
330 spin_unlock_irqrestore(&dev->lock, flags);
331
332 ite_dbg_verbose("%s done returning %d", __func__, (int)ret);
333
334 return ret;
335}
336
337/* set the rx carrier freq range, guess it's in Hz... */
338static int ite_set_rx_carrier_range(struct rc_dev *rcdev, u32 carrier_low, u32
339 carrier_high)
340{
341 unsigned long flags;
342 struct ite_dev *dev = rcdev->priv;
343
344 spin_lock_irqsave(&dev->lock, flags);
345 dev->params.rx_low_carrier_freq = carrier_low;
346 dev->params.rx_high_carrier_freq = carrier_high;
347 ite_set_carrier_params(dev);
348 spin_unlock_irqrestore(&dev->lock, flags);
349
350 return 0;
351}
352
353/* set the tx carrier freq, guess it's in Hz... */
354static int ite_set_tx_carrier(struct rc_dev *rcdev, u32 carrier)
355{
356 unsigned long flags;
357 struct ite_dev *dev = rcdev->priv;
358
359 spin_lock_irqsave(&dev->lock, flags);
360 dev->params.tx_carrier_freq = carrier;
361 ite_set_carrier_params(dev);
362 spin_unlock_irqrestore(&dev->lock, flags);
363
364 return 0;
365}
366
367/* set the tx duty cycle by controlling the pulse width */
368static int ite_set_tx_duty_cycle(struct rc_dev *rcdev, u32 duty_cycle)
369{
370 unsigned long flags;
371 struct ite_dev *dev = rcdev->priv;
372
373 spin_lock_irqsave(&dev->lock, flags);
374 dev->params.tx_duty_cycle = duty_cycle;
375 ite_set_carrier_params(dev);
376 spin_unlock_irqrestore(&dev->lock, flags);
377
378 return 0;
379}
380
381/* transmit out IR pulses; what you get here is a batch of alternating
382 * pulse/space/pulse/space lengths that we should write out completely through
383 * the FIFO, blocking on a full FIFO */
384static int ite_tx_ir(struct rc_dev *rcdev, int *txbuf, u32 n)
385{
386 unsigned long flags;
387 struct ite_dev *dev = rcdev->priv;
388 bool is_pulse = false;
389 int remaining_us, fifo_avail, fifo_remaining, last_idx = 0;
390 int max_rle_us, next_rle_us;
391 int ret = n;
392 u8 last_sent[ITE_TX_FIFO_LEN];
393 u8 val;
394
395 ite_dbg("%s called", __func__);
396
397 /* clear the array just in case */
398 memset(last_sent, 0, ARRAY_SIZE(last_sent));
399
400 /* n comes in bytes; convert to ints */
401 n /= sizeof(int);
402
403 spin_lock_irqsave(&dev->lock, flags);
404
405 /* let everybody know we're now transmitting */
406 dev->transmitting = true;
407
408 /* and set the carrier values for transmission */
409 ite_set_carrier_params(dev);
410
411 /* calculate how much time we can send in one byte */
412 max_rle_us =
413 (ITE_BAUDRATE_DIVISOR * dev->params.sample_period *
414 ITE_TX_MAX_RLE) / 1000;
415
416 /* disable the receiver */
417 dev->params.disable_rx(dev);
418
419 /* this is where we'll begin filling in the FIFO, until it's full.
420 * then we'll just activate the interrupt, wait for it to wake us up
421 * again, disable it, continue filling the FIFO... until everything
422 * has been pushed out */
423 fifo_avail =
424 ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev);
425
426 while (n > 0 && dev->in_use) {
427 /* transmit the next sample */
428 is_pulse = !is_pulse;
429 remaining_us = *(txbuf++);
430 n--;
431
432 ite_dbg("%s: %ld",
433 ((is_pulse) ? "pulse" : "space"),
434 (long int)
435 remaining_us);
436
437 /* repeat while the pulse is non-zero length */
438 while (remaining_us > 0 && dev->in_use) {
439 if (remaining_us > max_rle_us)
440 next_rle_us = max_rle_us;
441
442 else
443 next_rle_us = remaining_us;
444
445 remaining_us -= next_rle_us;
446
447 /* check what's the length we have to pump out */
448 val = (ITE_TX_MAX_RLE * next_rle_us) / max_rle_us;
449
450 /* put it into the sent buffer */
451 last_sent[last_idx++] = val;
452 last_idx &= (ITE_TX_FIFO_LEN);
453
454 /* encode it for 7 bits */
455 val = (val - 1) & ITE_TX_RLE_MASK;
456
457 /* take into account pulse/space prefix */
458 if (is_pulse)
459 val |= ITE_TX_PULSE;
460
461 else
462 val |= ITE_TX_SPACE;
463
2ccb24ff
MCC		 464 /*
465 * if we get to 0 available, read again, just in case
466 * some other slot got freed
467 */
620a32bb
JGS		 468 if (fifo_avail <= 0)
469 fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev);
470
471 /* if it's still full */
472 if (fifo_avail <= 0) {
473 /* enable the tx interrupt */
474 dev->params.
475 enable_tx_interrupt(dev);
476
477 /* drop the spinlock */
478 spin_unlock_irqrestore(&dev->lock, flags);
479
480 /* wait for the FIFO to empty enough */
481 wait_event_interruptible(dev->tx_queue, (fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev)) >= 8);
482
483 /* get the spinlock again */
484 spin_lock_irqsave(&dev->lock, flags);
485
486 /* disable the tx interrupt again. */
487 dev->params.
488 disable_tx_interrupt(dev);
489 }
490
491 /* now send the byte through the FIFO */
492 dev->params.put_tx_byte(dev, val);
493 fifo_avail--;
494 }
495 }
496
497 /* wait and don't return until the whole FIFO has been sent out;
498 * otherwise we could configure the RX carrier params instead of the
499 * TX ones while the transmission is still being performed! */
500 fifo_remaining = dev->params.get_tx_used_slots(dev);
501 remaining_us = 0;
502 while (fifo_remaining > 0) {
503 fifo_remaining--;
504 last_idx--;
505 last_idx &= (ITE_TX_FIFO_LEN - 1);
506 remaining_us += last_sent[last_idx];
507 }
508 remaining_us = (remaining_us * max_rle_us) / (ITE_TX_MAX_RLE);
509
510 /* drop the spinlock while we sleep */
511 spin_unlock_irqrestore(&dev->lock, flags);
512
513 /* sleep remaining_us microseconds */
514 mdelay(DIV_ROUND_UP(remaining_us, 1000));
515
516 /* reacquire the spinlock */
517 spin_lock_irqsave(&dev->lock, flags);
518
519 /* now we're not transmitting anymore */
520 dev->transmitting = false;
521
522 /* and set the carrier values for reception */
523 ite_set_carrier_params(dev);
524
525 /* reenable the receiver */
526 if (dev->in_use)
527 dev->params.enable_rx(dev);
528
529 /* notify transmission end */
530 wake_up_interruptible(&dev->tx_ended);
531
532 spin_unlock_irqrestore(&dev->lock, flags);
533
534 return ret;
535}
536
537/* idle the receiver if needed */
538static void ite_s_idle(struct rc_dev *rcdev, bool enable)
539{
540 unsigned long flags;
541 struct ite_dev *dev = rcdev->priv;
542
543 ite_dbg("%s called", __func__);
544
545 if (enable) {
546 spin_lock_irqsave(&dev->lock, flags);
547 dev->params.idle_rx(dev);
548 spin_unlock_irqrestore(&dev->lock, flags);
549 }
550}
551
552
553/* IT8712F HW-specific functions */
554
555/* retrieve a bitmask of the current causes for a pending interrupt; this may
556 * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN
557 * */
558static int it87_get_irq_causes(struct ite_dev *dev)
559{
560 u8 iflags;
561 int ret = 0;
562
563 ite_dbg("%s called", __func__);
564
565 /* read the interrupt flags */
566 iflags = inb(dev->cir_addr + IT87_IIR) & IT87_II;
567
568 switch (iflags) {
569 case IT87_II_RXDS:
570 ret = ITE_IRQ_RX_FIFO;
571 break;
572 case IT87_II_RXFO:
573 ret = ITE_IRQ_RX_FIFO_OVERRUN;
574 break;
575 case IT87_II_TXLDL:
576 ret = ITE_IRQ_TX_FIFO;
577 break;
578 }
579
580 return ret;
581}
582
583/* set the carrier parameters; to be called with the spinlock held */
584static void it87_set_carrier_params(struct ite_dev *dev, bool high_freq,
585 bool use_demodulator,
586 u8 carrier_freq_bits, u8 allowance_bits,
587 u8 pulse_width_bits)
588{
589 u8 val;
590
591 ite_dbg("%s called", __func__);
592
593 /* program the RCR register */
594 val = inb(dev->cir_addr + IT87_RCR)
595 & ~(IT87_HCFS | IT87_RXEND | IT87_RXDCR);
596
597 if (high_freq)
598 val |= IT87_HCFS;
599
600 if (use_demodulator)
601 val |= IT87_RXEND;
602
603 val |= allowance_bits;
604
605 outb(val, dev->cir_addr + IT87_RCR);
606
607 /* program the TCR2 register */
608 outb((carrier_freq_bits << IT87_CFQ_SHIFT) | pulse_width_bits,
609 dev->cir_addr + IT87_TCR2);
610}
611
612/* read up to buf_size bytes from the RX FIFO; to be called with the spinlock
613 * held */
614static int it87_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
615{
616 int fifo, read = 0;
617
618 ite_dbg("%s called", __func__);
619
620 /* read how many bytes are still in the FIFO */
621 fifo = inb(dev->cir_addr + IT87_RSR) & IT87_RXFBC;
622
623 while (fifo > 0 && buf_size > 0) {
624 *(buf++) = inb(dev->cir_addr + IT87_DR);
625 fifo--;
626 read++;
627 buf_size--;
628 }
629
630 return read;
631}
632
633/* return how many bytes are still in the FIFO; this will be called
634 * with the device spinlock NOT HELD while waiting for the TX FIFO to get
635 * empty; let's expect this won't be a problem */
636static int it87_get_tx_used_slots(struct ite_dev *dev)
637{
638 ite_dbg("%s called", __func__);
639
640 return inb(dev->cir_addr + IT87_TSR) & IT87_TXFBC;
641}
642
643/* put a byte to the TX fifo; this should be called with the spinlock held */
644static void it87_put_tx_byte(struct ite_dev *dev, u8 value)
645{
646 outb(value, dev->cir_addr + IT87_DR);
647}
648
649/* idle the receiver so that we won't receive samples until another
650 pulse is detected; this must be called with the device spinlock held */
651static void it87_idle_rx(struct ite_dev *dev)
652{
653 ite_dbg("%s called", __func__);
654
655 /* disable streaming by clearing RXACT writing it as 1 */
656 outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXACT,
657 dev->cir_addr + IT87_RCR);
658
659 /* clear the FIFO */
660 outb(inb(dev->cir_addr + IT87_TCR1) | IT87_FIFOCLR,
661 dev->cir_addr + IT87_TCR1);
662}
663
664/* disable the receiver; this must be called with the device spinlock held */
665static void it87_disable_rx(struct ite_dev *dev)
666{
667 ite_dbg("%s called", __func__);
668
669 /* disable the receiver interrupts */
670 outb(inb(dev->cir_addr + IT87_IER) & ~(IT87_RDAIE | IT87_RFOIE),
671 dev->cir_addr + IT87_IER);
672
673 /* disable the receiver */
674 outb(inb(dev->cir_addr + IT87_RCR) & ~IT87_RXEN,
675 dev->cir_addr + IT87_RCR);
676
677 /* clear the FIFO and RXACT (actually RXACT should have been cleared
678 * in the previous outb() call) */
679 it87_idle_rx(dev);
680}
681
682/* enable the receiver; this must be called with the device spinlock held */
683static void it87_enable_rx(struct ite_dev *dev)
684{
685 ite_dbg("%s called", __func__);
686
687 /* enable the receiver by setting RXEN */
688 outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXEN,
689 dev->cir_addr + IT87_RCR);
690
691 /* just prepare it to idle for the next reception */
692 it87_idle_rx(dev);
693
694 /* enable the receiver interrupts and master enable flag */
695 outb(inb(dev->cir_addr + IT87_IER) | IT87_RDAIE | IT87_RFOIE | IT87_IEC,
696 dev->cir_addr + IT87_IER);
697}
698
699/* disable the transmitter interrupt; this must be called with the device
700 * spinlock held */
701static void it87_disable_tx_interrupt(struct ite_dev *dev)
702{
703 ite_dbg("%s called", __func__);
704
705 /* disable the transmitter interrupts */
706 outb(inb(dev->cir_addr + IT87_IER) & ~IT87_TLDLIE,
707 dev->cir_addr + IT87_IER);
708}
709
710/* enable the transmitter interrupt; this must be called with the device
711 * spinlock held */
712static void it87_enable_tx_interrupt(struct ite_dev *dev)
713{
714 ite_dbg("%s called", __func__);
715
716 /* enable the transmitter interrupts and master enable flag */
717 outb(inb(dev->cir_addr + IT87_IER) | IT87_TLDLIE | IT87_IEC,
718 dev->cir_addr + IT87_IER);
719}
720
721/* disable the device; this must be called with the device spinlock held */
722static void it87_disable(struct ite_dev *dev)
723{
724 ite_dbg("%s called", __func__);
725
726 /* clear out all interrupt enable flags */
727 outb(inb(dev->cir_addr + IT87_IER) &
728 ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE),
729 dev->cir_addr + IT87_IER);
730
731 /* disable the receiver */
732 it87_disable_rx(dev);
733
734 /* erase the FIFO */
735 outb(IT87_FIFOCLR | inb(dev->cir_addr + IT87_TCR1),
736 dev->cir_addr + IT87_TCR1);
737}
738
739/* initialize the hardware */
740static void it87_init_hardware(struct ite_dev *dev)
741{
742 ite_dbg("%s called", __func__);
743
744 /* enable just the baud rate divisor register,
745 disabling all the interrupts at the same time */
746 outb((inb(dev->cir_addr + IT87_IER) &
747 ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE)) | IT87_BR,
748 dev->cir_addr + IT87_IER);
749
750 /* write out the baud rate divisor */
751 outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT87_BDLR);
752 outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff, dev->cir_addr + IT87_BDHR);
753
754 /* disable the baud rate divisor register again */
755 outb(inb(dev->cir_addr + IT87_IER) & ~IT87_BR,
756 dev->cir_addr + IT87_IER);
757
758 /* program the RCR register defaults */
759 outb(ITE_RXDCR_DEFAULT, dev->cir_addr + IT87_RCR);
760
761 /* program the TCR1 register */
762 outb(IT87_TXMPM_DEFAULT | IT87_TXENDF | IT87_TXRLE
763 | IT87_FIFOTL_DEFAULT | IT87_FIFOCLR,
764 dev->cir_addr + IT87_TCR1);
765
766 /* program the carrier parameters */
767 ite_set_carrier_params(dev);
768}
769
770/* IT8512F on ITE8708 HW-specific functions */
771
772/* retrieve a bitmask of the current causes for a pending interrupt; this may
773 * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN
774 * */
775static int it8708_get_irq_causes(struct ite_dev *dev)
776{
777 u8 iflags;
778 int ret = 0;
779
780 ite_dbg("%s called", __func__);
781
782 /* read the interrupt flags */
783 iflags = inb(dev->cir_addr + IT8708_C0IIR);
784
785 if (iflags & IT85_TLDLI)
786 ret |= ITE_IRQ_TX_FIFO;
787 if (iflags & IT85_RDAI)
788 ret |= ITE_IRQ_RX_FIFO;
789 if (iflags & IT85_RFOI)
790 ret |= ITE_IRQ_RX_FIFO_OVERRUN;
791
792 return ret;
793}
794
795/* set the carrier parameters; to be called with the spinlock held */
796static void it8708_set_carrier_params(struct ite_dev *dev, bool high_freq,
797 bool use_demodulator,
798 u8 carrier_freq_bits, u8 allowance_bits,
799 u8 pulse_width_bits)
800{
801 u8 val;
802
803 ite_dbg("%s called", __func__);
804
805 /* program the C0CFR register, with HRAE=1 */
806 outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE,
807 dev->cir_addr + IT8708_BANKSEL);
808
809 val = (inb(dev->cir_addr + IT8708_C0CFR)
810 & ~(IT85_HCFS | IT85_CFQ)) | carrier_freq_bits;
811
812 if (high_freq)
813 val |= IT85_HCFS;
814
815 outb(val, dev->cir_addr + IT8708_C0CFR);
816
817 outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE,
818 dev->cir_addr + IT8708_BANKSEL);
819
820 /* program the C0RCR register */
821 val = inb(dev->cir_addr + IT8708_C0RCR)
822 & ~(IT85_RXEND | IT85_RXDCR);
823
824 if (use_demodulator)
825 val |= IT85_RXEND;
826
827 val |= allowance_bits;
828
829 outb(val, dev->cir_addr + IT8708_C0RCR);
830
831 /* program the C0TCR register */
832 val = inb(dev->cir_addr + IT8708_C0TCR) & ~IT85_TXMPW;
833 val |= pulse_width_bits;
834 outb(val, dev->cir_addr + IT8708_C0TCR);
835}
836
837/* read up to buf_size bytes from the RX FIFO; to be called with the spinlock
838 * held */
839static int it8708_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
840{
841 int fifo, read = 0;
842
843 ite_dbg("%s called", __func__);
844
845 /* read how many bytes are still in the FIFO */
846 fifo = inb(dev->cir_addr + IT8708_C0RFSR) & IT85_RXFBC;
847
848 while (fifo > 0 && buf_size > 0) {
849 *(buf++) = inb(dev->cir_addr + IT8708_C0DR);
850 fifo--;
851 read++;
852 buf_size--;
853 }
854
855 return read;
856}
857
858/* return how many bytes are still in the FIFO; this will be called
859 * with the device spinlock NOT HELD while waiting for the TX FIFO to get
860 * empty; let's expect this won't be a problem */
861static int it8708_get_tx_used_slots(struct ite_dev *dev)
862{
863 ite_dbg("%s called", __func__);
864
865 return inb(dev->cir_addr + IT8708_C0TFSR) & IT85_TXFBC;
866}
867
868/* put a byte to the TX fifo; this should be called with the spinlock held */
869static void it8708_put_tx_byte(struct ite_dev *dev, u8 value)
870{
871 outb(value, dev->cir_addr + IT8708_C0DR);
872}
873
874/* idle the receiver so that we won't receive samples until another
875 pulse is detected; this must be called with the device spinlock held */
876static void it8708_idle_rx(struct ite_dev *dev)
877{
878 ite_dbg("%s called", __func__);
879
880 /* disable streaming by clearing RXACT writing it as 1 */
881 outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXACT,
882 dev->cir_addr + IT8708_C0RCR);
883
884 /* clear the FIFO */
885 outb(inb(dev->cir_addr + IT8708_C0MSTCR) | IT85_FIFOCLR,
886 dev->cir_addr + IT8708_C0MSTCR);
887}
888
889/* disable the receiver; this must be called with the device spinlock held */
890static void it8708_disable_rx(struct ite_dev *dev)
891{
892 ite_dbg("%s called", __func__);
893
894 /* disable the receiver interrupts */
895 outb(inb(dev->cir_addr + IT8708_C0IER) &
896 ~(IT85_RDAIE | IT85_RFOIE),
897 dev->cir_addr + IT8708_C0IER);
898
899 /* disable the receiver */
900 outb(inb(dev->cir_addr + IT8708_C0RCR) & ~IT85_RXEN,
901 dev->cir_addr + IT8708_C0RCR);
902
903 /* clear the FIFO and RXACT (actually RXACT should have been cleared
904 * in the previous outb() call) */
905 it8708_idle_rx(dev);
906}
907
908/* enable the receiver; this must be called with the device spinlock held */
909static void it8708_enable_rx(struct ite_dev *dev)
910{
911 ite_dbg("%s called", __func__);
912
913 /* enable the receiver by setting RXEN */
914 outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXEN,
915 dev->cir_addr + IT8708_C0RCR);
916
917 /* just prepare it to idle for the next reception */
918 it8708_idle_rx(dev);
919
920 /* enable the receiver interrupts and master enable flag */
921 outb(inb(dev->cir_addr + IT8708_C0IER)
922 |IT85_RDAIE | IT85_RFOIE | IT85_IEC,
923 dev->cir_addr + IT8708_C0IER);
924}
925
926/* disable the transmitter interrupt; this must be called with the device
927 * spinlock held */
928static void it8708_disable_tx_interrupt(struct ite_dev *dev)
929{
930 ite_dbg("%s called", __func__);
931
932 /* disable the transmitter interrupts */
933 outb(inb(dev->cir_addr + IT8708_C0IER) & ~IT85_TLDLIE,
934 dev->cir_addr + IT8708_C0IER);
935}
936
937/* enable the transmitter interrupt; this must be called with the device
938 * spinlock held */
939static void it8708_enable_tx_interrupt(struct ite_dev *dev)
940{
941 ite_dbg("%s called", __func__);
942
943 /* enable the transmitter interrupts and master enable flag */
944 outb(inb(dev->cir_addr + IT8708_C0IER)
945 |IT85_TLDLIE | IT85_IEC,
946 dev->cir_addr + IT8708_C0IER);
947}
948
949/* disable the device; this must be called with the device spinlock held */
950static void it8708_disable(struct ite_dev *dev)
951{
952 ite_dbg("%s called", __func__);
953
954 /* clear out all interrupt enable flags */
955 outb(inb(dev->cir_addr + IT8708_C0IER) &
956 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE),
957 dev->cir_addr + IT8708_C0IER);
958
959 /* disable the receiver */
960 it8708_disable_rx(dev);
961
962 /* erase the FIFO */
963 outb(IT85_FIFOCLR | inb(dev->cir_addr + IT8708_C0MSTCR),
964 dev->cir_addr + IT8708_C0MSTCR);
965}
966
967/* initialize the hardware */
968static void it8708_init_hardware(struct ite_dev *dev)
969{
970 ite_dbg("%s called", __func__);
971
972 /* disable all the interrupts */
973 outb(inb(dev->cir_addr + IT8708_C0IER) &
974 ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE),
975 dev->cir_addr + IT8708_C0IER);
976
977 /* program the baud rate divisor */
978 outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE,
979 dev->cir_addr + IT8708_BANKSEL);
980
981 outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT8708_C0BDLR);
982 outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff,
983 dev->cir_addr + IT8708_C0BDHR);
984
985 outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE,
986 dev->cir_addr + IT8708_BANKSEL);
987
988 /* program the C0MSTCR register defaults */
989 outb((inb(dev->cir_addr + IT8708_C0MSTCR) &
990 ~(IT85_ILSEL | IT85_ILE | IT85_FIFOTL |
991 IT85_FIFOCLR | IT85_RESET)) |
992 IT85_FIFOTL_DEFAULT,
993 dev->cir_addr + IT8708_C0MSTCR);
994
995 /* program the C0RCR register defaults */
996 outb((inb(dev->cir_addr + IT8708_C0RCR) &
997 ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND |
998 IT85_RXACT | IT85_RXDCR)) |
999 ITE_RXDCR_DEFAULT,
1000 dev->cir_addr + IT8708_C0RCR);
1001
1002 /* program the C0TCR register defaults */
1003 outb((inb(dev->cir_addr + IT8708_C0TCR) &
1004 ~(IT85_TXMPM | IT85_TXMPW))
1005 |IT85_TXRLE | IT85_TXENDF |
1006 IT85_TXMPM_DEFAULT | IT85_TXMPW_DEFAULT,
1007 dev->cir_addr + IT8708_C0TCR);
1008
1009 /* program the carrier parameters */
1010 ite_set_carrier_params(dev);
1011}
1012
1013/* IT8512F on ITE8709 HW-specific functions */
1014
1015/* read a byte from the SRAM module */
1016static inline u8 it8709_rm(struct ite_dev *dev, int index)
1017{
1018 outb(index, dev->cir_addr + IT8709_RAM_IDX);
1019 return inb(dev->cir_addr + IT8709_RAM_VAL);
1020}
1021
1022/* write a byte to the SRAM module */
1023static inline void it8709_wm(struct ite_dev *dev, u8 val, int index)
1024{
1025 outb(index, dev->cir_addr + IT8709_RAM_IDX);
1026 outb(val, dev->cir_addr + IT8709_RAM_VAL);
1027}
1028
1029static void it8709_wait(struct ite_dev *dev)
1030{
1031 int i = 0;
1032 /*
1033 * loop until device tells it's ready to continue
1034 * iterations count is usually ~750 but can sometimes achieve 13000
1035 */
1036 for (i = 0; i < 15000; i++) {
1037 udelay(2);
1038 if (it8709_rm(dev, IT8709_MODE) == IT8709_IDLE)
1039 break;
1040 }
1041}
1042
1043/* read the value of a CIR register */
1044static u8 it8709_rr(struct ite_dev *dev, int index)
1045{
1046 /* just wait in case the previous access was a write */
1047 it8709_wait(dev);
1048 it8709_wm(dev, index, IT8709_REG_IDX);
1049 it8709_wm(dev, IT8709_READ, IT8709_MODE);
1050
1051 /* wait for the read data to be available */
1052 it8709_wait(dev);
1053
1054 /* return the read value */
1055 return it8709_rm(dev, IT8709_REG_VAL);
1056}
1057
1058/* write the value of a CIR register */
1059static void it8709_wr(struct ite_dev *dev, u8 val, int index)
1060{
1061 /* we wait before writing, and not afterwards, since this allows us to
1062 * pipeline the host CPU with the microcontroller */
1063 it8709_wait(dev);
1064 it8709_wm(dev, val, IT8709_REG_VAL);
1065 it8709_wm(dev, index, IT8709_REG_IDX);
1066 it8709_wm(dev, IT8709_WRITE, IT8709_MODE);
1067}
1068
1069/* retrieve a bitmask of the current causes for a pending interrupt; this may
1070 * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN
1071 * */
1072static int it8709_get_irq_causes(struct ite_dev *dev)
1073{
1074 u8 iflags;
1075 int ret = 0;
1076
1077 ite_dbg("%s called", __func__);
1078
1079 /* read the interrupt flags */
1080 iflags = it8709_rm(dev, IT8709_IIR);
1081
1082 if (iflags & IT85_TLDLI)
1083 ret |= ITE_IRQ_TX_FIFO;
1084 if (iflags & IT85_RDAI)
1085 ret |= ITE_IRQ_RX_FIFO;
1086 if (iflags & IT85_RFOI)
1087 ret |= ITE_IRQ_RX_FIFO_OVERRUN;
1088
1089 return ret;
1090}
1091
1092/* set the carrier parameters; to be called with the spinlock held */
1093static void it8709_set_carrier_params(struct ite_dev *dev, bool high_freq,
1094 bool use_demodulator,
1095 u8 carrier_freq_bits, u8 allowance_bits,
1096 u8 pulse_width_bits)
1097{
1098 u8 val;
1099
1100 ite_dbg("%s called", __func__);
1101
1102 val = (it8709_rr(dev, IT85_C0CFR)
1103 &~(IT85_HCFS | IT85_CFQ)) |
1104 carrier_freq_bits;
1105
1106 if (high_freq)
1107 val |= IT85_HCFS;
1108
1109 it8709_wr(dev, val, IT85_C0CFR);
1110
1111 /* program the C0RCR register */
1112 val = it8709_rr(dev, IT85_C0RCR)
1113 & ~(IT85_RXEND | IT85_RXDCR);
1114
1115 if (use_demodulator)
1116 val |= IT85_RXEND;
1117
1118 val |= allowance_bits;
1119
1120 it8709_wr(dev, val, IT85_C0RCR);
1121
1122 /* program the C0TCR register */
1123 val = it8709_rr(dev, IT85_C0TCR) & ~IT85_TXMPW;
1124 val |= pulse_width_bits;
1125 it8709_wr(dev, val, IT85_C0TCR);
1126}
1127
1128/* read up to buf_size bytes from the RX FIFO; to be called with the spinlock
1129 * held */
1130static int it8709_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
1131{
1132 int fifo, read = 0;
1133
1134 ite_dbg("%s called", __func__);
1135
1136 /* read how many bytes are still in the FIFO */
1137 fifo = it8709_rm(dev, IT8709_RFSR) & IT85_RXFBC;
1138
1139 while (fifo > 0 && buf_size > 0) {
1140 *(buf++) = it8709_rm(dev, IT8709_FIFO + read);
1141 fifo--;
1142 read++;
1143 buf_size--;
1144 }
1145
1146 /* 'clear' the FIFO by setting the writing index to 0; this is
1147 * completely bound to be racy, but we can't help it, since it's a
1148 * limitation of the protocol */
1149 it8709_wm(dev, 0, IT8709_RFSR);
1150
1151 return read;
1152}
1153
1154/* return how many bytes are still in the FIFO; this will be called
1155 * with the device spinlock NOT HELD while waiting for the TX FIFO to get
1156 * empty; let's expect this won't be a problem */
1157static int it8709_get_tx_used_slots(struct ite_dev *dev)
1158{
1159 ite_dbg("%s called", __func__);
1160
1161 return it8709_rr(dev, IT85_C0TFSR) & IT85_TXFBC;
1162}
1163
1164/* put a byte to the TX fifo; this should be called with the spinlock held */
1165static void it8709_put_tx_byte(struct ite_dev *dev, u8 value)
1166{
1167 it8709_wr(dev, value, IT85_C0DR);
1168}
1169
1170/* idle the receiver so that we won't receive samples until another
1171 pulse is detected; this must be called with the device spinlock held */
1172static void it8709_idle_rx(struct ite_dev *dev)
1173{
1174 ite_dbg("%s called", __func__);
1175
1176 /* disable streaming by clearing RXACT writing it as 1 */
1177 it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXACT,
1178 IT85_C0RCR);
1179
1180 /* clear the FIFO */
1181 it8709_wr(dev, it8709_rr(dev, IT85_C0MSTCR) | IT85_FIFOCLR,
1182 IT85_C0MSTCR);
1183}
1184
1185/* disable the receiver; this must be called with the device spinlock held */
1186static void it8709_disable_rx(struct ite_dev *dev)
1187{
1188 ite_dbg("%s called", __func__);
1189
1190 /* disable the receiver interrupts */
1191 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) &
1192 ~(IT85_RDAIE | IT85_RFOIE),
1193 IT85_C0IER);
1194
1195 /* disable the receiver */
1196 it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) & ~IT85_RXEN,
1197 IT85_C0RCR);
1198
1199 /* clear the FIFO and RXACT (actually RXACT should have been cleared
1200 * in the previous it8709_wr(dev, ) call) */
1201 it8709_idle_rx(dev);
1202}
1203
1204/* enable the receiver; this must be called with the device spinlock held */
1205static void it8709_enable_rx(struct ite_dev *dev)
1206{
1207 ite_dbg("%s called", __func__);
1208
1209 /* enable the receiver by setting RXEN */
1210 it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXEN,
1211 IT85_C0RCR);
1212
1213 /* just prepare it to idle for the next reception */
1214 it8709_idle_rx(dev);
1215
1216 /* enable the receiver interrupts and master enable flag */
1217 it8709_wr(dev, it8709_rr(dev, IT85_C0IER)
1218 |IT85_RDAIE | IT85_RFOIE | IT85_IEC,
1219 IT85_C0IER);
1220}
1221
1222/* disable the transmitter interrupt; this must be called with the device
1223 * spinlock held */
1224static void it8709_disable_tx_interrupt(struct ite_dev *dev)
1225{
1226 ite_dbg("%s called", __func__);
1227
1228 /* disable the transmitter interrupts */
1229 it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & ~IT85_TLDLIE,
1230 IT85_C0IER);
1231}
1232
1233/* enable the transmitter interrupt; this must be called with the device
1234 * spinlock held */
1235static void it8709_enable_tx_interrupt(struct ite_dev *dev)
1236{
1237 ite_dbg("%s called", __func__);
1238
1239 /* enable the transmitter interrupts and master enable flag */
1240 it8709_wr(dev, it8709_rr(dev, IT85_C0IER)
1241 |IT85_TLDLIE | IT85_IEC,
1242 IT85_C0IER);
1243}
1244
1245/* disable the device; this must be called with the device spinlock held */
1246static void it8709_disable(struct ite_dev *dev)
1247{
1248 ite_dbg("%s called", __func__);
1249
1250 /* clear out all interrupt enable flags */
1251 it8709_wr(dev,
1252 it8709_rr(dev,
1253 IT85_C0IER) & ~(IT85_IEC | IT85_RFOIE |
1254 IT85_RDAIE |
1255 IT85_TLDLIE), IT85_C0IER);
1256
1257 /* disable the receiver */
1258 it8709_disable_rx(dev);
1259
1260 /* erase the FIFO */
1261 it8709_wr(dev, IT85_FIFOCLR | it8709_rr(dev, IT85_C0MSTCR),
1262 IT85_C0MSTCR);
1263}
1264
1265/* initialize the hardware */
1266static void it8709_init_hardware(struct ite_dev *dev)
1267{
1268 ite_dbg("%s called", __func__);
1269
1270 /* disable all the interrupts */
1271 it8709_wr(dev,
1272 it8709_rr(dev,
1273 IT85_C0IER) & ~(IT85_IEC | IT85_RFOIE |
1274 IT85_RDAIE |
1275 IT85_TLDLIE), IT85_C0IER);
1276
1277 /* program the baud rate divisor */
1278 it8709_wr(dev, ITE_BAUDRATE_DIVISOR & 0xff, IT85_C0BDLR);
1279 it8709_wr(dev, (ITE_BAUDRATE_DIVISOR >> 8) & 0xff,
1280 IT85_C0BDHR);
1281
1282 /* program the C0MSTCR register defaults */
1283 it8709_wr(dev, (it8709_rr(dev, IT85_C0MSTCR) & ~(IT85_ILSEL |
1284 IT85_ILE
1285 | IT85_FIFOTL
1286 |
1287 IT85_FIFOCLR
1288 |
1289 IT85_RESET))
1290 | IT85_FIFOTL_DEFAULT, IT85_C0MSTCR);
1291
1292 /* program the C0RCR register defaults */
1293 it8709_wr(dev,
1294 (it8709_rr(dev, IT85_C0RCR) &
1295 ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND
1296 | IT85_RXACT | IT85_RXDCR)) |
1297 ITE_RXDCR_DEFAULT, IT85_C0RCR);
1298
1299 /* program the C0TCR register defaults */
1300 it8709_wr(dev, (it8709_rr(dev, IT85_C0TCR)
1301 &~(IT85_TXMPM | IT85_TXMPW))
1302 |IT85_TXRLE | IT85_TXENDF |
1303 IT85_TXMPM_DEFAULT |
1304 IT85_TXMPW_DEFAULT, IT85_C0TCR);
1305
1306 /* program the carrier parameters */
1307 ite_set_carrier_params(dev);
1308}
1309
1310
1311/* generic hardware setup/teardown code */
1312
1313/* activate the device for use */
1314static int ite_open(struct rc_dev *rcdev)
1315{
1316 struct ite_dev *dev = rcdev->priv;
1317 unsigned long flags;
1318
1319 ite_dbg("%s called", __func__);
1320
1321 spin_lock_irqsave(&dev->lock, flags);
1322 dev->in_use = true;
1323
1324 /* enable the receiver */
1325 dev->params.enable_rx(dev);
1326
1327 spin_unlock_irqrestore(&dev->lock, flags);
1328
1329 return 0;
1330}
1331
1332/* deactivate the device for use */
1333static void ite_close(struct rc_dev *rcdev)
1334{
1335 struct ite_dev *dev = rcdev->priv;
1336 unsigned long flags;
1337
1338 ite_dbg("%s called", __func__);
1339
1340 spin_lock_irqsave(&dev->lock, flags);
1341 dev->in_use = false;
1342
1343 /* wait for any transmission to end */
1344 spin_unlock_irqrestore(&dev->lock, flags);
1345 wait_event_interruptible(dev->tx_ended, !dev->transmitting);
1346 spin_lock_irqsave(&dev->lock, flags);
1347
1348 dev->params.disable(dev);
1349
1350 spin_unlock_irqrestore(&dev->lock, flags);
1351}
1352
1353/* supported models and their parameters */
1354static const struct ite_dev_params ite_dev_descs[] = {
1355 { /* 0: ITE8704 */
1356 .model = "ITE8704 CIR transceiver",
1357 .io_region_size = IT87_IOREG_LENGTH,
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 { /* 1: ITE8713 */
1380 .model = "ITE8713 CIR transceiver",
1381 .io_region_size = IT87_IOREG_LENGTH,
1382 .hw_tx_capable = true,
1383 .sample_period = (u32) (1000000000ULL / 115200),
1384 .tx_carrier_freq = 38000,
1385 .tx_duty_cycle = 33,
1386 .rx_low_carrier_freq = 0,
1387 .rx_high_carrier_freq = 0,
1388
1389 /* operations */
1390 .get_irq_causes = it87_get_irq_causes,
1391 .enable_rx = it87_enable_rx,
1392 .idle_rx = it87_idle_rx,
1393 .disable_rx = it87_idle_rx,
1394 .get_rx_bytes = it87_get_rx_bytes,
1395 .enable_tx_interrupt = it87_enable_tx_interrupt,
1396 .disable_tx_interrupt = it87_disable_tx_interrupt,
1397 .get_tx_used_slots = it87_get_tx_used_slots,
1398 .put_tx_byte = it87_put_tx_byte,
1399 .disable = it87_disable,
1400 .init_hardware = it87_init_hardware,
1401 .set_carrier_params = it87_set_carrier_params,
1402 },
1403 { /* 2: ITE8708 */
1404 .model = "ITE8708 CIR transceiver",
1405 .io_region_size = IT8708_IOREG_LENGTH,
1406 .hw_tx_capable = true,
1407 .sample_period = (u32) (1000000000ULL / 115200),
1408 .tx_carrier_freq = 38000,
1409 .tx_duty_cycle = 33,
1410 .rx_low_carrier_freq = 0,
1411 .rx_high_carrier_freq = 0,
1412
1413 /* operations */
1414 .get_irq_causes = it8708_get_irq_causes,
1415 .enable_rx = it8708_enable_rx,
1416 .idle_rx = it8708_idle_rx,
1417 .disable_rx = it8708_idle_rx,
1418 .get_rx_bytes = it8708_get_rx_bytes,
1419 .enable_tx_interrupt = it8708_enable_tx_interrupt,
1420 .disable_tx_interrupt =
1421 it8708_disable_tx_interrupt,
1422 .get_tx_used_slots = it8708_get_tx_used_slots,
1423 .put_tx_byte = it8708_put_tx_byte,
1424 .disable = it8708_disable,
1425 .init_hardware = it8708_init_hardware,
1426 .set_carrier_params = it8708_set_carrier_params,
1427 },
1428 { /* 3: ITE8709 */
1429 .model = "ITE8709 CIR transceiver",
1430 .io_region_size = IT8709_IOREG_LENGTH,
1431 .hw_tx_capable = true,
1432 .sample_period = (u32) (1000000000ULL / 115200),
1433 .tx_carrier_freq = 38000,
1434 .tx_duty_cycle = 33,
1435 .rx_low_carrier_freq = 0,
1436 .rx_high_carrier_freq = 0,
1437
1438 /* operations */
1439 .get_irq_causes = it8709_get_irq_causes,
1440 .enable_rx = it8709_enable_rx,
1441 .idle_rx = it8709_idle_rx,
1442 .disable_rx = it8709_idle_rx,
1443 .get_rx_bytes = it8709_get_rx_bytes,
1444 .enable_tx_interrupt = it8709_enable_tx_interrupt,
1445 .disable_tx_interrupt =
1446 it8709_disable_tx_interrupt,
1447 .get_tx_used_slots = it8709_get_tx_used_slots,
1448 .put_tx_byte = it8709_put_tx_byte,
1449 .disable = it8709_disable,
1450 .init_hardware = it8709_init_hardware,
1451 .set_carrier_params = it8709_set_carrier_params,
1452 },
1453};
1454
1455static const struct pnp_device_id ite_ids[] = {
1456 {"ITE8704", 0}, /* Default model */
1457 {"ITE8713", 1}, /* CIR found in EEEBox 1501U */
1458 {"ITE8708", 2}, /* Bridged IT8512 */
1459 {"ITE8709", 3}, /* SRAM-Bridged IT8512 */
1460 {"", 0},
1461};
1462
1463/* allocate memory, probe hardware, and initialize everything */
1464static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id
1465 *dev_id)
1466{
1467 const struct ite_dev_params *dev_desc = NULL;
1468 struct ite_dev *itdev = NULL;
1469 struct rc_dev *rdev = NULL;
1470 int ret = -ENOMEM;
1471 int model_no;
1472
1473 ite_dbg("%s called", __func__);
1474
1475 itdev = kzalloc(sizeof(struct ite_dev), GFP_KERNEL);
1476 if (!itdev)
1477 return ret;
1478
1479 /* input device for IR remote (and tx) */
1480 rdev = rc_allocate_device();
1481 if (!rdev)
1482 goto failure;
1483
1484 ret = -ENODEV;
1485
1486 /* get the model number */
1487 model_no = (int)dev_id->driver_data;
1488 ite_pr(KERN_NOTICE, "Auto-detected model: %s\n",
1489 ite_dev_descs[model_no].model);
1490
1491 if (model_number >= 0 && model_number < ARRAY_SIZE(ite_dev_descs)) {
1492 model_no = model_number;
1493 ite_pr(KERN_NOTICE, "The model has been fixed by a module "
1494 "parameter.");
1495 }
1496
1497 ite_pr(KERN_NOTICE, "Using model: %s\n", ite_dev_descs[model_no].model);
1498
1499 /* get the description for the device */
1500 dev_desc = &ite_dev_descs[model_no];
1501
1502 /* validate pnp resources */
1503 if (!pnp_port_valid(pdev, 0) ||
1504 pnp_port_len(pdev, 0) != dev_desc->io_region_size) {
1505 dev_err(&pdev->dev, "IR PNP Port not valid!\n");
1506 goto failure;
1507 }
1508
1509 if (!pnp_irq_valid(pdev, 0)) {
1510 dev_err(&pdev->dev, "PNP IRQ not valid!\n");
1511 goto failure;
1512 }
1513
1514 /* store resource values */
1515 itdev->cir_addr = pnp_port_start(pdev, 0);
2ccb24ff 1516 itdev->cir_irq = pnp_irq(pdev, 0);
620a32bb
JGS		 1517
1518 /* initialize spinlocks */
1519 spin_lock_init(&itdev->lock);
1520
1521 /* initialize raw event */
1522 init_ir_raw_event(&itdev->rawir);
1523
1524 ret = -EBUSY;
1525 /* now claim resources */
1526 if (!request_region(itdev->cir_addr,
1527 dev_desc->io_region_size, ITE_DRIVER_NAME))
1528 goto failure;
1529
1530 if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED,
1531 ITE_DRIVER_NAME, (void *)itdev))
1532 goto failure;
1533
1534 /* set driver data into the pnp device */
1535 pnp_set_drvdata(pdev, itdev);
1536 itdev->pdev = pdev;
1537
1538 /* initialize waitqueues for transmission */
1539 init_waitqueue_head(&itdev->tx_queue);
1540 init_waitqueue_head(&itdev->tx_ended);
1541
1542 /* copy model-specific parameters */
1543 itdev->params = *dev_desc;
1544
1545 /* apply any overrides */
1546 if (sample_period > 0)
1547 itdev->params.sample_period = sample_period;
1548
1549 if (tx_carrier_freq > 0)
1550 itdev->params.tx_carrier_freq = tx_carrier_freq;
1551
1552 if (tx_duty_cycle > 0 && tx_duty_cycle <= 100)
1553 itdev->params.tx_duty_cycle = tx_duty_cycle;
1554
1555 if (rx_low_carrier_freq > 0)
1556 itdev->params.rx_low_carrier_freq = rx_low_carrier_freq;
1557
1558 if (rx_high_carrier_freq > 0)
1559 itdev->params.rx_high_carrier_freq = rx_high_carrier_freq;
1560
1561 /* print out parameters */
1562 ite_pr(KERN_NOTICE, "TX-capable: %d\n", (int)
1563 itdev->params.hw_tx_capable);
1564 ite_pr(KERN_NOTICE, "Sample period (ns): %ld\n", (long)
1565 itdev->params.sample_period);
1566 ite_pr(KERN_NOTICE, "TX carrier frequency (Hz): %d\n", (int)
1567 itdev->params.tx_carrier_freq);
1568 ite_pr(KERN_NOTICE, "TX duty cycle (%%): %d\n", (int)
1569 itdev->params.tx_duty_cycle);
1570 ite_pr(KERN_NOTICE, "RX low carrier frequency (Hz): %d\n", (int)
1571 itdev->params.rx_low_carrier_freq);
1572 ite_pr(KERN_NOTICE, "RX high carrier frequency (Hz): %d\n", (int)
1573 itdev->params.rx_high_carrier_freq);
1574
1575 /* set up hardware initial state */
1576 itdev->params.init_hardware(itdev);
1577
1578 /* set up ir-core props */
1579 rdev->priv = itdev;
1580 rdev->driver_type = RC_DRIVER_IR_RAW;
1581 rdev->allowed_protos = RC_TYPE_ALL;
1582 rdev->open = ite_open;
1583 rdev->close = ite_close;
1584 rdev->s_idle = ite_s_idle;
1585 rdev->s_rx_carrier_range = ite_set_rx_carrier_range;
1586 rdev->min_timeout = ITE_MIN_IDLE_TIMEOUT;
1587 rdev->max_timeout = ITE_MAX_IDLE_TIMEOUT;
1588 rdev->timeout = ITE_IDLE_TIMEOUT;
1589 rdev->rx_resolution = ITE_BAUDRATE_DIVISOR *
1590 itdev->params.sample_period;
1591 rdev->tx_resolution = ITE_BAUDRATE_DIVISOR *
1592 itdev->params.sample_period;
1593
1594 /* set up transmitter related values if needed */
1595 if (itdev->params.hw_tx_capable) {
1596 rdev->tx_ir = ite_tx_ir;
1597 rdev->s_tx_carrier = ite_set_tx_carrier;
1598 rdev->s_tx_duty_cycle = ite_set_tx_duty_cycle;
1599 }
1600
1601 rdev->input_name = dev_desc->model;
1602 rdev->input_id.bustype = BUS_HOST;
1603 rdev->input_id.vendor = PCI_VENDOR_ID_ITE;
1604 rdev->input_id.product = 0;
1605 rdev->input_id.version = 0;
1606 rdev->driver_name = ITE_DRIVER_NAME;
1607 rdev->map_name = RC_MAP_RC6_MCE;
1608
1609 ret = rc_register_device(rdev);
1610 if (ret)
1611 goto failure;
1612
1613 itdev->rdev = rdev;
1614 ite_pr(KERN_NOTICE, "driver has been successfully loaded\n");
1615
1616 return 0;
1617
1618failure:
1619 if (itdev->cir_irq)
1620 free_irq(itdev->cir_irq, itdev);
1621
1622 if (itdev->cir_addr)
1623 release_region(itdev->cir_addr, itdev->params.io_region_size);
1624
1625 rc_free_device(rdev);
1626 kfree(itdev);
1627
1628 return ret;
1629}
1630
1631static void __devexit ite_remove(struct pnp_dev *pdev)
1632{
1633 struct ite_dev *dev = pnp_get_drvdata(pdev);
1634 unsigned long flags;
1635
1636 ite_dbg("%s called", __func__);
1637
1638 spin_lock_irqsave(&dev->lock, flags);
1639
1640 /* disable hardware */
1641 dev->params.disable(dev);
1642
1643 spin_unlock_irqrestore(&dev->lock, flags);
1644
1645 /* free resources */
1646 free_irq(dev->cir_irq, dev);
1647 release_region(dev->cir_addr, dev->params.io_region_size);
1648
1649 rc_unregister_device(dev->rdev);
1650
1651 kfree(dev);
1652}
1653
1654static int ite_suspend(struct pnp_dev *pdev, pm_message_t state)
1655{
1656 struct ite_dev *dev = pnp_get_drvdata(pdev);
1657 unsigned long flags;
1658
1659 ite_dbg("%s called", __func__);
1660
1661 spin_lock_irqsave(&dev->lock, flags);
1662
1663 /* disable all interrupts */
1664 dev->params.disable(dev);
1665
1666 spin_unlock_irqrestore(&dev->lock, flags);
1667
1668 return 0;
1669}
1670
1671static int ite_resume(struct pnp_dev *pdev)
1672{
1673 int ret = 0;
1674 struct ite_dev *dev = pnp_get_drvdata(pdev);
1675 unsigned long flags;
1676
1677 ite_dbg("%s called", __func__);
1678
1679 spin_lock_irqsave(&dev->lock, flags);
1680
1681 if (dev->transmitting) {
1682 /* wake up the transmitter */
1683 wake_up_interruptible(&dev->tx_queue);
1684 } else {
1685 /* enable the receiver */
1686 dev->params.enable_rx(dev);
1687 }
1688
1689 spin_unlock_irqrestore(&dev->lock, flags);
1690
1691 return ret;
1692}
1693
1694static void ite_shutdown(struct pnp_dev *pdev)
1695{
1696 struct ite_dev *dev = pnp_get_drvdata(pdev);
1697 unsigned long flags;
1698
1699 ite_dbg("%s called", __func__);
1700
1701 spin_lock_irqsave(&dev->lock, flags);
1702
1703 /* disable all interrupts */
1704 dev->params.disable(dev);
1705
1706 spin_unlock_irqrestore(&dev->lock, flags);
1707}
1708
1709static struct pnp_driver ite_driver = {
1710 .name = ITE_DRIVER_NAME,
1711 .id_table = ite_ids,
1712 .probe = ite_probe,
1713 .remove = __devexit_p(ite_remove),
1714 .suspend = ite_suspend,
1715 .resume = ite_resume,
1716 .shutdown = ite_shutdown,
1717};
1718
1719int ite_init(void)
1720{
1721 return pnp_register_driver(&ite_driver);
1722}
1723
1724void ite_exit(void)
1725{
1726 pnp_unregister_driver(&ite_driver);
1727}
1728
1729MODULE_DEVICE_TABLE(pnp, ite_ids);
1730MODULE_DESCRIPTION("ITE Tech Inc. IT8712F/ITE8512F CIR driver");
1731
1732MODULE_AUTHOR("Juan J. Garcia de Soria <skandalfo@gmail.com>");
1733MODULE_LICENSE("GPL");
1734
1735module_init(ite_init);
1736module_exit(ite_exit);
Linux kernel - Deliverables
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