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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(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, io + offset); | |
158 | } | |
159 | ||
160 | static void on(void) | |
161 | { | |
162 | if (txsense) | |
163 | soutp(UART_MCR, hardware[type].off); | |
164 | else | |
165 | soutp(UART_MCR, hardware[type].on); | |
166 | } | |
167 | ||
168 | static void off(void) | |
169 | { | |
170 | if (txsense) | |
171 | soutp(UART_MCR, hardware[type].on); | |
172 | else | |
173 | soutp(UART_MCR, 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, 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, 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(edge, 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(now, 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(now, 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 > 250000) { | |
273 | ev.duration = space; | |
274 | ev.pulse = false; | |
275 | ir_raw_event_store_with_filter(serial_ir.rcdev, &ev); | |
276 | ev.duration = pulse; | |
277 | ev.pulse = true; | |
278 | ir_raw_event_store_with_filter(serial_ir.rcdev, &ev); | |
279 | ptr = 0; | |
280 | pulse = 0; | |
281 | } | |
282 | return; | |
283 | } | |
284 | if (!is_pulse) { | |
285 | if (ptr == 0) { | |
286 | if (l > 20000000) { | |
287 | space = l; | |
288 | ptr++; | |
289 | return; | |
290 | } | |
291 | } else { | |
292 | if (l > 20000000) { | |
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(serial_ir.rcdev, &ev); | |
306 | ev.duration = pulse; | |
307 | ev.pulse = true; | |
308 | ir_raw_event_store_with_filter(serial_ir.rcdev, &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(serial_ir.rcdev, &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_err(&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(delkt, ktime_set(15, 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_ns(delkt); | |
380 | } | |
381 | frbwrite(data, !(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(&serial_ir.timeout_timer, | |
388 | jiffies + nsecs_to_jiffies(serial_ir.rcdev->timeout)); | |
389 | ||
390 | ir_raw_event_handle(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, 0); | |
405 | #ifdef __i386__ | |
406 | outb(0xff, 0x080); | |
407 | #endif | |
408 | scratch2 = sinp(UART_IER) & 0x0f; | |
409 | soutp(UART_IER, 0x0f); | |
410 | #ifdef __i386__ | |
411 | outb(0x00, 0x080); | |
412 | #endif | |
413 | scratch3 = sinp(UART_IER) & 0x0f; | |
414 | soutp(UART_IER, 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, sinp(UART_LCR) & (~UART_LCR_DLAB)); | |
423 | ||
424 | /* First of all, disable all interrupts */ | |
425 | soutp(UART_IER, 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, sinp(UART_LCR) | UART_LCR_DLAB); | |
451 | /* Set divisor to 1 => 115200 Baud */ | |
452 | soutp(UART_DLM, 0); | |
453 | soutp(UART_DLL, 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(serial_ir.rcdev, &ev); | |
472 | ir_raw_event_handle(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, 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 = 250000; | |
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, irq, serial_ir_irq_handler, | |
538 | share_irq ? IRQF_SHARED : 0, | |
539 | KBUILD_MODNAME, &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, 8 << 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(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(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(&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, sinp(UART_LCR) & (~UART_LCR_DLAB)); | |
611 | ||
612 | soutp(UART_IER, sinp(UART_IER) | UART_IER_MSI); | |
613 | ||
614 | spin_unlock_irqrestore(&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, sinp(UART_LCR) & (~UART_LCR_DLAB)); | |
627 | ||
628 | /* First of all, disable all interrupts */ | |
629 | soutp(UART_IER, sinp(UART_IER) & | |
630 | (~(UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI))); | |
631 | spin_unlock_irqrestore(&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(edge, txbuf[i]); | |
656 | delta = ktime_us_delta(edge, ktime_get()); | |
657 | if (delta > 25) { | |
658 | spin_unlock_irqrestore(&hardware[type].lock, flags); | |
659 | usleep_range(delta - 25, 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(&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, sinp(UART_LCR) & (~UART_LCR_DLAB)); | |
690 | ||
691 | /* Disable all interrupts */ | |
692 | soutp(UART_IER, 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, sinp(UART_IER) | UART_IER_MSI); | |
717 | off(); | |
718 | ||
719 | spin_unlock_irqrestore(&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("serial_ir", 0); | |
742 | if (!serial_ir.pdev) { | |
743 | result = -ENOMEM; | |
744 | goto exit_driver_unregister; | |
745 | } | |
746 | ||
747 | result = platform_device_add(serial_ir.pdev); | |
748 | if (result) | |
749 | goto exit_device_put; | |
750 | ||
751 | return 0; | |
752 | ||
753 | exit_device_put: | |
754 | platform_device_put(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(&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)"); |