1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * serial_ir.c |
4 | * |
5 | * serial_ir - Device driver that records pulse- and pause-lengths |
6 | * (space-lengths) between DDCD event on a serial port. |
7 | * |
8 | * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de> |
9 | * Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu> |
10 | * Copyright (C) 1998 Ben Pfaff <blp@gnu.org> |
11 | * Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de> |
12 | * Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support) |
13 | * Copyright (C) 2016 Sean Young <sean@mess.org> (port to rc-core) |
14 | */ |
15 | |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | |
18 | #include <linux/module.h> |
19 | #include <linux/errno.h> |
20 | #include <linux/interrupt.h> |
21 | #include <linux/kernel.h> |
22 | #include <linux/serial_reg.h> |
23 | #include <linux/types.h> |
24 | #include <linux/delay.h> |
25 | #include <linux/platform_device.h> |
26 | #include <linux/spinlock.h> |
27 | #include <media/rc-core.h> |
28 | |
29 | struct serial_ir_hw { |
30 | int signal_pin; |
31 | int signal_pin_change; |
32 | u8 on; |
33 | u8 off; |
34 | unsigned set_send_carrier:1; |
35 | unsigned set_duty_cycle:1; |
36 | void (*send_pulse)(unsigned int length, ktime_t edge); |
37 | void (*send_space)(void); |
38 | spinlock_t lock; |
39 | }; |
40 | |
41 | #define IR_HOMEBREW 0 |
42 | #define IR_IRDEO 1 |
43 | #define IR_IRDEO_REMOTE 2 |
44 | #define IR_ANIMAX 3 |
45 | #define IR_IGOR 4 |
46 | |
47 | /* module parameters */ |
48 | static int type; |
49 | static int io; |
50 | static int irq; |
51 | static ulong iommap; |
52 | static int ioshift; |
53 | static bool softcarrier = true; |
54 | static bool share_irq; |
55 | static int sense = -1; /* -1 = auto, 0 = active high, 1 = active low */ |
56 | static bool txsense; /* 0 = active high, 1 = active low */ |
57 | |
58 | /* forward declarations */ |
59 | static void send_pulse_irdeo(unsigned int length, ktime_t edge); |
60 | static void send_space_irdeo(void); |
61 | #ifdef CONFIG_IR_SERIAL_TRANSMITTER |
62 | static void send_pulse_homebrew(unsigned int length, ktime_t edge); |
63 | static void send_space_homebrew(void); |
64 | #endif |
65 | |
66 | static struct serial_ir_hw hardware[] = { |
67 | [IR_HOMEBREW] = { |
68 | .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_HOMEBREW].lock), |
69 | .signal_pin = UART_MSR_DCD, |
70 | .signal_pin_change = UART_MSR_DDCD, |
71 | .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR), |
72 | .off = (UART_MCR_RTS | UART_MCR_OUT2), |
73 | #ifdef CONFIG_IR_SERIAL_TRANSMITTER |
74 | .send_pulse = send_pulse_homebrew, |
75 | .send_space = send_space_homebrew, |
76 | .set_send_carrier = true, |
77 | .set_duty_cycle = true, |
78 | #endif |
79 | }, |
80 | |
81 | [IR_IRDEO] = { |
82 | .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IRDEO].lock), |
83 | .signal_pin = UART_MSR_DSR, |
84 | .signal_pin_change = UART_MSR_DDSR, |
85 | .on = UART_MCR_OUT2, |
86 | .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2), |
87 | .send_pulse = send_pulse_irdeo, |
88 | .send_space = send_space_irdeo, |
89 | .set_duty_cycle = true, |
90 | }, |
91 | |
92 | [IR_IRDEO_REMOTE] = { |
93 | .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IRDEO_REMOTE].lock), |
94 | .signal_pin = UART_MSR_DSR, |
95 | .signal_pin_change = UART_MSR_DDSR, |
96 | .on = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2), |
97 | .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2), |
98 | .send_pulse = send_pulse_irdeo, |
99 | .send_space = send_space_irdeo, |
100 | .set_duty_cycle = true, |
101 | }, |
102 | |
103 | [IR_ANIMAX] = { |
104 | .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_ANIMAX].lock), |
105 | .signal_pin = UART_MSR_DCD, |
106 | .signal_pin_change = UART_MSR_DDCD, |
107 | .on = 0, |
108 | .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2), |
109 | }, |
110 | |
111 | [IR_IGOR] = { |
112 | .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IGOR].lock), |
113 | .signal_pin = UART_MSR_DSR, |
114 | .signal_pin_change = UART_MSR_DDSR, |
115 | .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR), |
116 | .off = (UART_MCR_RTS | UART_MCR_OUT2), |
117 | #ifdef CONFIG_IR_SERIAL_TRANSMITTER |
118 | .send_pulse = send_pulse_homebrew, |
119 | .send_space = send_space_homebrew, |
120 | .set_send_carrier = true, |
121 | .set_duty_cycle = true, |
122 | #endif |
123 | }, |
124 | }; |
125 | |
126 | #define RS_ISR_PASS_LIMIT 256 |
127 | |
128 | struct serial_ir { |
129 | ktime_t lastkt; |
130 | struct rc_dev *rcdev; |
131 | struct platform_device *pdev; |
132 | struct timer_list timeout_timer; |
133 | |
134 | unsigned int carrier; |
135 | unsigned int duty_cycle; |
136 | }; |
137 | |
138 | static struct serial_ir serial_ir; |
139 | |
140 | /* fetch serial input packet (1 byte) from register offset */ |
141 | static u8 sinp(int offset) |
142 | { |
143 | if (iommap) |
144 | /* the register is memory-mapped */ |
145 | offset <<= ioshift; |
146 | |
147 | return inb(port: io + offset); |
148 | } |
149 | |
150 | /* write serial output packet (1 byte) of value to register offset */ |
151 | static void soutp(int offset, u8 value) |
152 | { |
153 | if (iommap) |
154 | /* the register is memory-mapped */ |
155 | offset <<= ioshift; |
156 | |
157 | outb(value, port: io + offset); |
158 | } |
159 | |
160 | static void on(void) |
161 | { |
162 | if (txsense) |
163 | soutp(UART_MCR, value: hardware[type].off); |
164 | else |
165 | soutp(UART_MCR, value: hardware[type].on); |
166 | } |
167 | |
168 | static void off(void) |
169 | { |
170 | if (txsense) |
171 | soutp(UART_MCR, value: hardware[type].on); |
172 | else |
173 | soutp(UART_MCR, value: hardware[type].off); |
174 | } |
175 | |
176 | static void send_pulse_irdeo(unsigned int length, ktime_t target) |
177 | { |
178 | long rawbits; |
179 | int i; |
180 | unsigned char output; |
181 | unsigned char chunk, shifted; |
182 | |
183 | /* how many bits have to be sent ? */ |
184 | rawbits = length * 1152 / 10000; |
185 | if (serial_ir.duty_cycle > 50) |
186 | chunk = 3; |
187 | else |
188 | chunk = 1; |
189 | for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) { |
190 | shifted = chunk << (i * 3); |
191 | shifted >>= 1; |
192 | output &= (~shifted); |
193 | i++; |
194 | if (i == 3) { |
195 | soutp(UART_TX, value: output); |
196 | while (!(sinp(UART_LSR) & UART_LSR_THRE)) |
197 | ; |
198 | output = 0x7f; |
199 | i = 0; |
200 | } |
201 | } |
202 | if (i != 0) { |
203 | soutp(UART_TX, value: output); |
204 | while (!(sinp(UART_LSR) & UART_LSR_TEMT)) |
205 | ; |
206 | } |
207 | } |
208 | |
209 | static void send_space_irdeo(void) |
210 | { |
211 | } |
212 | |
213 | #ifdef CONFIG_IR_SERIAL_TRANSMITTER |
214 | static void send_pulse_homebrew_softcarrier(unsigned int length, ktime_t edge) |
215 | { |
216 | ktime_t now, target = ktime_add_us(kt: edge, usec: length); |
217 | /* |
218 | * delta should never exceed 4 seconds and on m68k |
219 | * ndelay(s64) does not compile; so use s32 rather than s64. |
220 | */ |
221 | s32 delta; |
222 | unsigned int pulse, space; |
223 | |
224 | /* Ensure the dividend fits into 32 bit */ |
225 | pulse = DIV_ROUND_CLOSEST(serial_ir.duty_cycle * (NSEC_PER_SEC / 100), |
226 | serial_ir.carrier); |
227 | space = DIV_ROUND_CLOSEST((100 - serial_ir.duty_cycle) * |
228 | (NSEC_PER_SEC / 100), serial_ir.carrier); |
229 | |
230 | for (;;) { |
231 | now = ktime_get(); |
232 | if (ktime_compare(cmp1: now, cmp2: target) >= 0) |
233 | break; |
234 | on(); |
235 | edge = ktime_add_ns(edge, pulse); |
236 | delta = ktime_to_ns(ktime_sub(edge, now)); |
237 | if (delta > 0) |
238 | ndelay(delta); |
239 | now = ktime_get(); |
240 | off(); |
241 | if (ktime_compare(cmp1: now, cmp2: target) >= 0) |
242 | break; |
243 | edge = ktime_add_ns(edge, space); |
244 | delta = ktime_to_ns(ktime_sub(edge, now)); |
245 | if (delta > 0) |
246 | ndelay(delta); |
247 | } |
248 | } |
249 | |
250 | static void send_pulse_homebrew(unsigned int length, ktime_t edge) |
251 | { |
252 | if (softcarrier) |
253 | send_pulse_homebrew_softcarrier(length, edge); |
254 | else |
255 | on(); |
256 | } |
257 | |
258 | static void send_space_homebrew(void) |
259 | { |
260 | off(); |
261 | } |
262 | #endif |
263 | |
264 | static void frbwrite(unsigned int l, bool is_pulse) |
265 | { |
266 | /* simple noise filter */ |
267 | static unsigned int ptr, pulse, space; |
268 | struct ir_raw_event ev = {}; |
269 | |
270 | if (ptr > 0 && is_pulse) { |
271 | pulse += l; |
272 | if (pulse > 250) { |
273 | ev.duration = space; |
274 | ev.pulse = false; |
275 | ir_raw_event_store_with_filter(dev: serial_ir.rcdev, ev: &ev); |
276 | ev.duration = pulse; |
277 | ev.pulse = true; |
278 | ir_raw_event_store_with_filter(dev: serial_ir.rcdev, ev: &ev); |
279 | ptr = 0; |
280 | pulse = 0; |
281 | } |
282 | return; |
283 | } |
284 | if (!is_pulse) { |
285 | if (ptr == 0) { |
286 | if (l > 20000) { |
287 | space = l; |
288 | ptr++; |
289 | return; |
290 | } |
291 | } else { |
292 | if (l > 20000) { |
293 | space += pulse; |
294 | if (space > IR_MAX_DURATION) |
295 | space = IR_MAX_DURATION; |
296 | space += l; |
297 | if (space > IR_MAX_DURATION) |
298 | space = IR_MAX_DURATION; |
299 | pulse = 0; |
300 | return; |
301 | } |
302 | |
303 | ev.duration = space; |
304 | ev.pulse = false; |
305 | ir_raw_event_store_with_filter(dev: serial_ir.rcdev, ev: &ev); |
306 | ev.duration = pulse; |
307 | ev.pulse = true; |
308 | ir_raw_event_store_with_filter(dev: serial_ir.rcdev, ev: &ev); |
309 | ptr = 0; |
310 | pulse = 0; |
311 | } |
312 | } |
313 | |
314 | ev.duration = l; |
315 | ev.pulse = is_pulse; |
316 | ir_raw_event_store_with_filter(dev: serial_ir.rcdev, ev: &ev); |
317 | } |
318 | |
319 | static irqreturn_t serial_ir_irq_handler(int i, void *blah) |
320 | { |
321 | ktime_t kt; |
322 | int counter, dcd; |
323 | u8 status; |
324 | ktime_t delkt; |
325 | unsigned int data; |
326 | static int last_dcd = -1; |
327 | |
328 | if ((sinp(UART_IIR) & UART_IIR_NO_INT)) { |
329 | /* not our interrupt */ |
330 | return IRQ_NONE; |
331 | } |
332 | |
333 | counter = 0; |
334 | do { |
335 | counter++; |
336 | status = sinp(UART_MSR); |
337 | if (counter > RS_ISR_PASS_LIMIT) { |
338 | dev_err(&serial_ir.pdev->dev, "Trapped in interrupt" ); |
339 | break; |
340 | } |
341 | if ((status & hardware[type].signal_pin_change) && |
342 | sense != -1) { |
343 | /* get current time */ |
344 | kt = ktime_get(); |
345 | |
346 | /* |
347 | * The driver needs to know if your receiver is |
348 | * active high or active low, or the space/pulse |
349 | * sense could be inverted. |
350 | */ |
351 | |
352 | /* calc time since last interrupt in nanoseconds */ |
353 | dcd = (status & hardware[type].signal_pin) ? 1 : 0; |
354 | |
355 | if (dcd == last_dcd) { |
356 | dev_dbg(&serial_ir.pdev->dev, |
357 | "ignoring spike: %d %d %lldns %lldns\n" , |
358 | dcd, sense, ktime_to_ns(kt), |
359 | ktime_to_ns(serial_ir.lastkt)); |
360 | continue; |
361 | } |
362 | |
363 | delkt = ktime_sub(kt, serial_ir.lastkt); |
364 | if (ktime_compare(cmp1: delkt, cmp2: ktime_set(secs: 15, nsecs: 0)) > 0) { |
365 | data = IR_MAX_DURATION; /* really long time */ |
366 | if (!(dcd ^ sense)) { |
367 | /* sanity check */ |
368 | dev_err(&serial_ir.pdev->dev, |
369 | "dcd unexpected: %d %d %lldns %lldns\n" , |
370 | dcd, sense, ktime_to_ns(kt), |
371 | ktime_to_ns(serial_ir.lastkt)); |
372 | /* |
373 | * detecting pulse while this |
374 | * MUST be a space! |
375 | */ |
376 | sense = sense ? 0 : 1; |
377 | } |
378 | } else { |
379 | data = ktime_to_us(kt: delkt); |
380 | } |
381 | frbwrite(l: data, is_pulse: !(dcd ^ sense)); |
382 | serial_ir.lastkt = kt; |
383 | last_dcd = dcd; |
384 | } |
385 | } while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */ |
386 | |
387 | mod_timer(timer: &serial_ir.timeout_timer, |
388 | expires: jiffies + usecs_to_jiffies(u: serial_ir.rcdev->timeout)); |
389 | |
390 | ir_raw_event_handle(dev: serial_ir.rcdev); |
391 | |
392 | return IRQ_HANDLED; |
393 | } |
394 | |
395 | static int hardware_init_port(void) |
396 | { |
397 | u8 scratch, scratch2, scratch3; |
398 | |
399 | /* |
400 | * This is a simple port existence test, borrowed from the autoconfig |
401 | * function in drivers/tty/serial/8250/8250_port.c |
402 | */ |
403 | scratch = sinp(UART_IER); |
404 | soutp(UART_IER, value: 0); |
405 | #ifdef __i386__ |
406 | outb(0xff, 0x080); |
407 | #endif |
408 | scratch2 = sinp(UART_IER) & 0x0f; |
409 | soutp(UART_IER, value: 0x0f); |
410 | #ifdef __i386__ |
411 | outb(0x00, 0x080); |
412 | #endif |
413 | scratch3 = sinp(UART_IER) & 0x0f; |
414 | soutp(UART_IER, value: scratch); |
415 | if (scratch2 != 0 || scratch3 != 0x0f) { |
416 | /* we fail, there's nothing here */ |
417 | pr_err("port existence test failed, cannot continue\n" ); |
418 | return -ENODEV; |
419 | } |
420 | |
421 | /* Set DLAB 0. */ |
422 | soutp(UART_LCR, value: sinp(UART_LCR) & (~UART_LCR_DLAB)); |
423 | |
424 | /* First of all, disable all interrupts */ |
425 | soutp(UART_IER, value: sinp(UART_IER) & |
426 | (~(UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI))); |
427 | |
428 | /* Clear registers. */ |
429 | sinp(UART_LSR); |
430 | sinp(UART_RX); |
431 | sinp(UART_IIR); |
432 | sinp(UART_MSR); |
433 | |
434 | /* Set line for power source */ |
435 | off(); |
436 | |
437 | /* Clear registers again to be sure. */ |
438 | sinp(UART_LSR); |
439 | sinp(UART_RX); |
440 | sinp(UART_IIR); |
441 | sinp(UART_MSR); |
442 | |
443 | switch (type) { |
444 | case IR_IRDEO: |
445 | case IR_IRDEO_REMOTE: |
446 | /* setup port to 7N1 @ 115200 Baud */ |
447 | /* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */ |
448 | |
449 | /* Set DLAB 1. */ |
450 | soutp(UART_LCR, value: sinp(UART_LCR) | UART_LCR_DLAB); |
451 | /* Set divisor to 1 => 115200 Baud */ |
452 | soutp(UART_DLM, value: 0); |
453 | soutp(UART_DLL, value: 1); |
454 | /* Set DLAB 0 + 7N1 */ |
455 | soutp(UART_LCR, UART_LCR_WLEN7); |
456 | /* THR interrupt already disabled at this point */ |
457 | break; |
458 | default: |
459 | break; |
460 | } |
461 | |
462 | return 0; |
463 | } |
464 | |
465 | static void serial_ir_timeout(struct timer_list *unused) |
466 | { |
467 | struct ir_raw_event ev = { |
468 | .timeout = true, |
469 | .duration = serial_ir.rcdev->timeout |
470 | }; |
471 | ir_raw_event_store_with_filter(dev: serial_ir.rcdev, ev: &ev); |
472 | ir_raw_event_handle(dev: serial_ir.rcdev); |
473 | } |
474 | |
475 | /* Needed by serial_ir_probe() */ |
476 | static int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf, |
477 | unsigned int count); |
478 | static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle); |
479 | static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier); |
480 | static int serial_ir_open(struct rc_dev *rcdev); |
481 | static void serial_ir_close(struct rc_dev *rcdev); |
482 | |
483 | static int serial_ir_probe(struct platform_device *dev) |
484 | { |
485 | struct rc_dev *rcdev; |
486 | int i, nlow, nhigh, result; |
487 | |
488 | rcdev = devm_rc_allocate_device(dev: &dev->dev, RC_DRIVER_IR_RAW); |
489 | if (!rcdev) |
490 | return -ENOMEM; |
491 | |
492 | if (hardware[type].send_pulse && hardware[type].send_space) |
493 | rcdev->tx_ir = serial_ir_tx; |
494 | if (hardware[type].set_send_carrier) |
495 | rcdev->s_tx_carrier = serial_ir_tx_carrier; |
496 | if (hardware[type].set_duty_cycle) |
497 | rcdev->s_tx_duty_cycle = serial_ir_tx_duty_cycle; |
498 | |
499 | switch (type) { |
500 | case IR_HOMEBREW: |
501 | rcdev->device_name = "Serial IR type home-brew" ; |
502 | break; |
503 | case IR_IRDEO: |
504 | rcdev->device_name = "Serial IR type IRdeo" ; |
505 | break; |
506 | case IR_IRDEO_REMOTE: |
507 | rcdev->device_name = "Serial IR type IRdeo remote" ; |
508 | break; |
509 | case IR_ANIMAX: |
510 | rcdev->device_name = "Serial IR type AnimaX" ; |
511 | break; |
512 | case IR_IGOR: |
513 | rcdev->device_name = "Serial IR type IgorPlug" ; |
514 | break; |
515 | } |
516 | |
517 | rcdev->input_phys = KBUILD_MODNAME "/input0" ; |
518 | rcdev->input_id.bustype = BUS_HOST; |
519 | rcdev->input_id.vendor = 0x0001; |
520 | rcdev->input_id.product = 0x0001; |
521 | rcdev->input_id.version = 0x0100; |
522 | rcdev->open = serial_ir_open; |
523 | rcdev->close = serial_ir_close; |
524 | rcdev->dev.parent = &serial_ir.pdev->dev; |
525 | rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; |
526 | rcdev->driver_name = KBUILD_MODNAME; |
527 | rcdev->map_name = RC_MAP_RC6_MCE; |
528 | rcdev->min_timeout = 1; |
529 | rcdev->timeout = IR_DEFAULT_TIMEOUT; |
530 | rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT; |
531 | rcdev->rx_resolution = 250; |
532 | |
533 | serial_ir.rcdev = rcdev; |
534 | |
535 | timer_setup(&serial_ir.timeout_timer, serial_ir_timeout, 0); |
536 | |
537 | result = devm_request_irq(dev: &dev->dev, irq, handler: serial_ir_irq_handler, |
538 | irqflags: share_irq ? IRQF_SHARED : 0, |
539 | KBUILD_MODNAME, dev_id: &hardware); |
540 | if (result < 0) { |
541 | if (result == -EBUSY) |
542 | dev_err(&dev->dev, "IRQ %d busy\n" , irq); |
543 | else if (result == -EINVAL) |
544 | dev_err(&dev->dev, "Bad irq number or handler\n" ); |
545 | return result; |
546 | } |
547 | |
548 | /* Reserve io region. */ |
549 | if ((iommap && |
550 | (devm_request_mem_region(&dev->dev, iommap, 8UL << ioshift, |
551 | KBUILD_MODNAME) == NULL)) || |
552 | (!iommap && (devm_request_region(&dev->dev, io, 8, |
553 | KBUILD_MODNAME) == NULL))) { |
554 | dev_err(&dev->dev, "port %04x already in use\n" , io); |
555 | dev_warn(&dev->dev, "use 'setserial /dev/ttySX uart none'\n" ); |
556 | dev_warn(&dev->dev, |
557 | "or compile the serial port driver as module and\n" ); |
558 | dev_warn(&dev->dev, "make sure this module is loaded first\n" ); |
559 | return -EBUSY; |
560 | } |
561 | |
562 | result = hardware_init_port(); |
563 | if (result < 0) |
564 | return result; |
565 | |
566 | /* Initialize pulse/space widths */ |
567 | serial_ir.duty_cycle = 50; |
568 | serial_ir.carrier = 38000; |
569 | |
570 | /* If pin is high, then this must be an active low receiver. */ |
571 | if (sense == -1) { |
572 | /* wait 1/2 sec for the power supply */ |
573 | msleep(msecs: 500); |
574 | |
575 | /* |
576 | * probe 9 times every 0.04s, collect "votes" for |
577 | * active high/low |
578 | */ |
579 | nlow = 0; |
580 | nhigh = 0; |
581 | for (i = 0; i < 9; i++) { |
582 | if (sinp(UART_MSR) & hardware[type].signal_pin) |
583 | nlow++; |
584 | else |
585 | nhigh++; |
586 | msleep(msecs: 40); |
587 | } |
588 | sense = nlow >= nhigh ? 1 : 0; |
589 | dev_info(&dev->dev, "auto-detected active %s receiver\n" , |
590 | sense ? "low" : "high" ); |
591 | } else |
592 | dev_info(&dev->dev, "Manually using active %s receiver\n" , |
593 | sense ? "low" : "high" ); |
594 | |
595 | dev_dbg(&dev->dev, "Interrupt %d, port %04x obtained\n" , irq, io); |
596 | |
597 | return devm_rc_register_device(parent: &dev->dev, dev: rcdev); |
598 | } |
599 | |
600 | static int serial_ir_open(struct rc_dev *rcdev) |
601 | { |
602 | unsigned long flags; |
603 | |
604 | /* initialize timestamp */ |
605 | serial_ir.lastkt = ktime_get(); |
606 | |
607 | spin_lock_irqsave(&hardware[type].lock, flags); |
608 | |
609 | /* Set DLAB 0. */ |
610 | soutp(UART_LCR, value: sinp(UART_LCR) & (~UART_LCR_DLAB)); |
611 | |
612 | soutp(UART_IER, value: sinp(UART_IER) | UART_IER_MSI); |
613 | |
614 | spin_unlock_irqrestore(lock: &hardware[type].lock, flags); |
615 | |
616 | return 0; |
617 | } |
618 | |
619 | static void serial_ir_close(struct rc_dev *rcdev) |
620 | { |
621 | unsigned long flags; |
622 | |
623 | spin_lock_irqsave(&hardware[type].lock, flags); |
624 | |
625 | /* Set DLAB 0. */ |
626 | soutp(UART_LCR, value: sinp(UART_LCR) & (~UART_LCR_DLAB)); |
627 | |
628 | /* First of all, disable all interrupts */ |
629 | soutp(UART_IER, value: sinp(UART_IER) & |
630 | (~(UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI))); |
631 | spin_unlock_irqrestore(lock: &hardware[type].lock, flags); |
632 | } |
633 | |
634 | static int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf, |
635 | unsigned int count) |
636 | { |
637 | unsigned long flags; |
638 | ktime_t edge; |
639 | s64 delta; |
640 | int i; |
641 | |
642 | spin_lock_irqsave(&hardware[type].lock, flags); |
643 | if (type == IR_IRDEO) { |
644 | /* DTR, RTS down */ |
645 | on(); |
646 | } |
647 | |
648 | edge = ktime_get(); |
649 | for (i = 0; i < count; i++) { |
650 | if (i % 2) |
651 | hardware[type].send_space(); |
652 | else |
653 | hardware[type].send_pulse(txbuf[i], edge); |
654 | |
655 | edge = ktime_add_us(kt: edge, usec: txbuf[i]); |
656 | delta = ktime_us_delta(later: edge, earlier: ktime_get()); |
657 | if (delta > 25) { |
658 | spin_unlock_irqrestore(lock: &hardware[type].lock, flags); |
659 | usleep_range(min: delta - 25, max: delta + 25); |
660 | spin_lock_irqsave(&hardware[type].lock, flags); |
661 | } else if (delta > 0) { |
662 | udelay(delta); |
663 | } |
664 | } |
665 | off(); |
666 | spin_unlock_irqrestore(lock: &hardware[type].lock, flags); |
667 | return count; |
668 | } |
669 | |
670 | static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle) |
671 | { |
672 | serial_ir.duty_cycle = cycle; |
673 | return 0; |
674 | } |
675 | |
676 | static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier) |
677 | { |
678 | if (carrier > 500000 || carrier < 20000) |
679 | return -EINVAL; |
680 | |
681 | serial_ir.carrier = carrier; |
682 | return 0; |
683 | } |
684 | |
685 | static int serial_ir_suspend(struct platform_device *dev, |
686 | pm_message_t state) |
687 | { |
688 | /* Set DLAB 0. */ |
689 | soutp(UART_LCR, value: sinp(UART_LCR) & (~UART_LCR_DLAB)); |
690 | |
691 | /* Disable all interrupts */ |
692 | soutp(UART_IER, value: sinp(UART_IER) & |
693 | (~(UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI))); |
694 | |
695 | /* Clear registers. */ |
696 | sinp(UART_LSR); |
697 | sinp(UART_RX); |
698 | sinp(UART_IIR); |
699 | sinp(UART_MSR); |
700 | |
701 | return 0; |
702 | } |
703 | |
704 | static int serial_ir_resume(struct platform_device *dev) |
705 | { |
706 | unsigned long flags; |
707 | int result; |
708 | |
709 | result = hardware_init_port(); |
710 | if (result < 0) |
711 | return result; |
712 | |
713 | spin_lock_irqsave(&hardware[type].lock, flags); |
714 | /* Enable Interrupt */ |
715 | serial_ir.lastkt = ktime_get(); |
716 | soutp(UART_IER, value: sinp(UART_IER) | UART_IER_MSI); |
717 | off(); |
718 | |
719 | spin_unlock_irqrestore(lock: &hardware[type].lock, flags); |
720 | |
721 | return 0; |
722 | } |
723 | |
724 | static struct platform_driver serial_ir_driver = { |
725 | .probe = serial_ir_probe, |
726 | .suspend = serial_ir_suspend, |
727 | .resume = serial_ir_resume, |
728 | .driver = { |
729 | .name = "serial_ir" , |
730 | }, |
731 | }; |
732 | |
733 | static int __init serial_ir_init(void) |
734 | { |
735 | int result; |
736 | |
737 | result = platform_driver_register(&serial_ir_driver); |
738 | if (result) |
739 | return result; |
740 | |
741 | serial_ir.pdev = platform_device_alloc(name: "serial_ir" , id: 0); |
742 | if (!serial_ir.pdev) { |
743 | result = -ENOMEM; |
744 | goto exit_driver_unregister; |
745 | } |
746 | |
747 | result = platform_device_add(pdev: serial_ir.pdev); |
748 | if (result) |
749 | goto exit_device_put; |
750 | |
751 | return 0; |
752 | |
753 | exit_device_put: |
754 | platform_device_put(pdev: serial_ir.pdev); |
755 | exit_driver_unregister: |
756 | platform_driver_unregister(&serial_ir_driver); |
757 | return result; |
758 | } |
759 | |
760 | static void serial_ir_exit(void) |
761 | { |
762 | platform_device_unregister(serial_ir.pdev); |
763 | platform_driver_unregister(&serial_ir_driver); |
764 | } |
765 | |
766 | static int __init serial_ir_init_module(void) |
767 | { |
768 | switch (type) { |
769 | case IR_HOMEBREW: |
770 | case IR_IRDEO: |
771 | case IR_IRDEO_REMOTE: |
772 | case IR_ANIMAX: |
773 | case IR_IGOR: |
774 | /* if nothing specified, use ttyS0/com1 and irq 4 */ |
775 | io = io ? io : 0x3f8; |
776 | irq = irq ? irq : 4; |
777 | break; |
778 | default: |
779 | return -EINVAL; |
780 | } |
781 | if (!softcarrier) { |
782 | switch (type) { |
783 | case IR_HOMEBREW: |
784 | case IR_IGOR: |
785 | hardware[type].set_send_carrier = false; |
786 | hardware[type].set_duty_cycle = false; |
787 | break; |
788 | } |
789 | } |
790 | |
791 | /* make sure sense is either -1, 0, or 1 */ |
792 | if (sense != -1) |
793 | sense = !!sense; |
794 | |
795 | return serial_ir_init(); |
796 | } |
797 | |
798 | static void __exit serial_ir_exit_module(void) |
799 | { |
800 | del_timer_sync(timer: &serial_ir.timeout_timer); |
801 | serial_ir_exit(); |
802 | } |
803 | |
804 | module_init(serial_ir_init_module); |
805 | module_exit(serial_ir_exit_module); |
806 | |
807 | MODULE_DESCRIPTION("Infra-red receiver driver for serial ports." ); |
808 | MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, Christoph Bartelmus, Andrei Tanas" ); |
809 | MODULE_LICENSE("GPL" ); |
810 | |
811 | module_param(type, int, 0444); |
812 | MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo, 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug" ); |
813 | |
814 | module_param_hw(io, int, ioport, 0444); |
815 | MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)" ); |
816 | |
817 | /* some architectures (e.g. intel xscale) have memory mapped registers */ |
818 | module_param_hw(iommap, ulong, other, 0444); |
819 | MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory mapped io)" ); |
820 | |
821 | /* |
822 | * some architectures (e.g. intel xscale) align the 8bit serial registers |
823 | * on 32bit word boundaries. |
824 | * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out() |
825 | */ |
826 | module_param_hw(ioshift, int, other, 0444); |
827 | MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)" ); |
828 | |
829 | module_param_hw(irq, int, irq, 0444); |
830 | MODULE_PARM_DESC(irq, "Interrupt (4 or 3)" ); |
831 | |
832 | module_param_hw(share_irq, bool, other, 0444); |
833 | MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)" ); |
834 | |
835 | module_param(sense, int, 0444); |
836 | MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit (0 = active high, 1 = active low )" ); |
837 | |
838 | #ifdef CONFIG_IR_SERIAL_TRANSMITTER |
839 | module_param(txsense, bool, 0444); |
840 | MODULE_PARM_DESC(txsense, "Sense of transmitter circuit (0 = active high, 1 = active low )" ); |
841 | #endif |
842 | |
843 | module_param(softcarrier, bool, 0444); |
844 | MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)" ); |
845 | |