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21#include <linux/device.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/usb.h>
25#include <linux/usb/input.h>
26#include <linux/slab.h>
27#include <linux/completion.h>
28#include <media/rc-core.h>
29
30#define DRIVER_NAME "iguanair"
31#define BUF_SIZE 152
32
33struct iguanair {
34 struct rc_dev *rc;
35
36 struct device *dev;
37 struct usb_device *udev;
38
39 uint16_t version;
40 uint8_t bufsize;
41 uint8_t cycle_overhead;
42
43 struct mutex lock;
44
45
46 bool receiver_on;
47 dma_addr_t dma_in, dma_out;
48 uint8_t *buf_in;
49 struct urb *urb_in, *urb_out;
50 struct completion completion;
51
52
53 bool tx_overflow;
54 uint32_t carrier;
55 struct send_packet *packet;
56
57 char name[64];
58 char phys[64];
59};
60
61#define CMD_NOP 0x00
62#define CMD_GET_VERSION 0x01
63#define CMD_GET_BUFSIZE 0x11
64#define CMD_GET_FEATURES 0x10
65#define CMD_SEND 0x15
66#define CMD_EXECUTE 0x1f
67#define CMD_RX_OVERFLOW 0x31
68#define CMD_TX_OVERFLOW 0x32
69#define CMD_RECEIVER_ON 0x12
70#define CMD_RECEIVER_OFF 0x14
71
72#define DIR_IN 0xdc
73#define DIR_OUT 0xcd
74
75#define MAX_IN_PACKET 8u
76#define MAX_OUT_PACKET (sizeof(struct send_packet) + BUF_SIZE)
77#define TIMEOUT 1000
78#define RX_RESOLUTION 21333
79
80struct packet {
81 uint16_t start;
82 uint8_t direction;
83 uint8_t cmd;
84};
85
86struct send_packet {
87 struct packet header;
88 uint8_t length;
89 uint8_t channels;
90 uint8_t busy7;
91 uint8_t busy4;
92 uint8_t payload[0];
93};
94
95static void process_ir_data(struct iguanair *ir, unsigned len)
96{
97 if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
98 switch (ir->buf_in[3]) {
99 case CMD_GET_VERSION:
100 if (len == 6) {
101 ir->version = (ir->buf_in[5] << 8) |
102 ir->buf_in[4];
103 complete(&ir->completion);
104 }
105 break;
106 case CMD_GET_BUFSIZE:
107 if (len >= 5) {
108 ir->bufsize = ir->buf_in[4];
109 complete(&ir->completion);
110 }
111 break;
112 case CMD_GET_FEATURES:
113 if (len > 5) {
114 ir->cycle_overhead = ir->buf_in[5];
115 complete(&ir->completion);
116 }
117 break;
118 case CMD_TX_OVERFLOW:
119 ir->tx_overflow = true;
120 case CMD_RECEIVER_OFF:
121 case CMD_RECEIVER_ON:
122 case CMD_SEND:
123 complete(&ir->completion);
124 break;
125 case CMD_RX_OVERFLOW:
126 dev_warn(ir->dev, "receive overflow\n");
127 ir_raw_event_reset(ir->rc);
128 break;
129 default:
130 dev_warn(ir->dev, "control code %02x received\n",
131 ir->buf_in[3]);
132 break;
133 }
134 } else if (len >= 7) {
135 DEFINE_IR_RAW_EVENT(rawir);
136 unsigned i;
137 bool event = false;
138
139 init_ir_raw_event(&rawir);
140
141 for (i = 0; i < 7; i++) {
142 if (ir->buf_in[i] == 0x80) {
143 rawir.pulse = false;
144 rawir.duration = US_TO_NS(21845);
145 } else {
146 rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
147 rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
148 RX_RESOLUTION;
149 }
150
151 if (ir_raw_event_store_with_filter(ir->rc, &rawir))
152 event = true;
153 }
154
155 if (event)
156 ir_raw_event_handle(ir->rc);
157 }
158}
159
160static void iguanair_rx(struct urb *urb)
161{
162 struct iguanair *ir;
163 int rc;
164
165 if (!urb)
166 return;
167
168 ir = urb->context;
169 if (!ir) {
170 usb_unlink_urb(urb);
171 return;
172 }
173
174 switch (urb->status) {
175 case 0:
176 process_ir_data(ir, urb->actual_length);
177 break;
178 case -ECONNRESET:
179 case -ENOENT:
180 case -ESHUTDOWN:
181 usb_unlink_urb(urb);
182 return;
183 case -EPIPE:
184 default:
185 dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
186 break;
187 }
188
189 rc = usb_submit_urb(urb, GFP_ATOMIC);
190 if (rc && rc != -ENODEV)
191 dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
192}
193
194static void iguanair_irq_out(struct urb *urb)
195{
196 struct iguanair *ir = urb->context;
197
198 if (urb->status)
199 dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
200
201
202 if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
203 complete(&ir->completion);
204}
205
206static int iguanair_send(struct iguanair *ir, unsigned size)
207{
208 int rc;
209
210 reinit_completion(&ir->completion);
211
212 ir->urb_out->transfer_buffer_length = size;
213 rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
214 if (rc)
215 return rc;
216
217 if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
218 return -ETIMEDOUT;
219
220 return rc;
221}
222
223static int iguanair_get_features(struct iguanair *ir)
224{
225 int rc;
226
227
228
229
230
231
232 ir->packet->header.start = 0;
233 ir->packet->header.direction = DIR_OUT;
234 ir->packet->header.cmd = CMD_NOP;
235 iguanair_send(ir, sizeof(ir->packet->header));
236
237 ir->packet->header.cmd = CMD_GET_VERSION;
238 rc = iguanair_send(ir, sizeof(ir->packet->header));
239 if (rc) {
240 dev_info(ir->dev, "failed to get version\n");
241 goto out;
242 }
243
244 if (ir->version < 0x205) {
245 dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
246 rc = -ENODEV;
247 goto out;
248 }
249
250 ir->bufsize = 150;
251 ir->cycle_overhead = 65;
252
253 ir->packet->header.cmd = CMD_GET_BUFSIZE;
254
255 rc = iguanair_send(ir, sizeof(ir->packet->header));
256 if (rc) {
257 dev_info(ir->dev, "failed to get buffer size\n");
258 goto out;
259 }
260
261 if (ir->bufsize > BUF_SIZE) {
262 dev_info(ir->dev, "buffer size %u larger than expected\n",
263 ir->bufsize);
264 ir->bufsize = BUF_SIZE;
265 }
266
267 ir->packet->header.cmd = CMD_GET_FEATURES;
268
269 rc = iguanair_send(ir, sizeof(ir->packet->header));
270 if (rc)
271 dev_info(ir->dev, "failed to get features\n");
272out:
273 return rc;
274}
275
276static int iguanair_receiver(struct iguanair *ir, bool enable)
277{
278 ir->packet->header.start = 0;
279 ir->packet->header.direction = DIR_OUT;
280 ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
281
282 if (enable)
283 ir_raw_event_reset(ir->rc);
284
285 return iguanair_send(ir, sizeof(ir->packet->header));
286}
287
288
289
290
291
292
293
294static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
295{
296 struct iguanair *ir = dev->priv;
297
298 if (carrier < 25000 || carrier > 150000)
299 return -EINVAL;
300
301 mutex_lock(&ir->lock);
302
303 if (carrier != ir->carrier) {
304 uint32_t cycles, fours, sevens;
305
306 ir->carrier = carrier;
307
308 cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
309 ir->cycle_overhead;
310
311
312
313
314
315
316 sevens = (4 - cycles) & 3;
317 fours = (cycles - sevens * 7) / 4;
318
319
320 ir->packet->busy7 = (4 - sevens) * 2;
321 ir->packet->busy4 = 110 - fours;
322 }
323
324 mutex_unlock(&ir->lock);
325
326 return carrier;
327}
328
329static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
330{
331 struct iguanair *ir = dev->priv;
332
333 if (mask > 15)
334 return 4;
335
336 mutex_lock(&ir->lock);
337 ir->packet->channels = mask << 4;
338 mutex_unlock(&ir->lock);
339
340 return 0;
341}
342
343static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
344{
345 struct iguanair *ir = dev->priv;
346 uint8_t space;
347 unsigned i, size, periods, bytes;
348 int rc;
349
350 mutex_lock(&ir->lock);
351
352
353 for (i = space = size = 0; i < count; i++) {
354 periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
355 bytes = DIV_ROUND_UP(periods, 127);
356 if (size + bytes > ir->bufsize) {
357 rc = -EINVAL;
358 goto out;
359 }
360 while (periods > 127) {
361 ir->packet->payload[size++] = 127 | space;
362 periods -= 127;
363 }
364
365 ir->packet->payload[size++] = periods | space;
366 space ^= 0x80;
367 }
368
369 if (count == 0) {
370 rc = -EINVAL;
371 goto out;
372 }
373
374 ir->packet->header.start = 0;
375 ir->packet->header.direction = DIR_OUT;
376 ir->packet->header.cmd = CMD_SEND;
377 ir->packet->length = size;
378
379 ir->tx_overflow = false;
380
381 rc = iguanair_send(ir, sizeof(*ir->packet) + size);
382
383 if (rc == 0 && ir->tx_overflow)
384 rc = -EOVERFLOW;
385
386out:
387 mutex_unlock(&ir->lock);
388
389 return rc ? rc : count;
390}
391
392static int iguanair_open(struct rc_dev *rdev)
393{
394 struct iguanair *ir = rdev->priv;
395 int rc;
396
397 mutex_lock(&ir->lock);
398
399 rc = iguanair_receiver(ir, true);
400 if (rc == 0)
401 ir->receiver_on = true;
402
403 mutex_unlock(&ir->lock);
404
405 return rc;
406}
407
408static void iguanair_close(struct rc_dev *rdev)
409{
410 struct iguanair *ir = rdev->priv;
411 int rc;
412
413 mutex_lock(&ir->lock);
414
415 rc = iguanair_receiver(ir, false);
416 ir->receiver_on = false;
417 if (rc && rc != -ENODEV)
418 dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
419
420 mutex_unlock(&ir->lock);
421}
422
423static int iguanair_probe(struct usb_interface *intf,
424 const struct usb_device_id *id)
425{
426 struct usb_device *udev = interface_to_usbdev(intf);
427 struct iguanair *ir;
428 struct rc_dev *rc;
429 int ret, pipein, pipeout;
430 struct usb_host_interface *idesc;
431
432 ir = kzalloc(sizeof(*ir), GFP_KERNEL);
433 rc = rc_allocate_device();
434 if (!ir || !rc) {
435 ret = -ENOMEM;
436 goto out;
437 }
438
439 ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
440 &ir->dma_in);
441 ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
442 &ir->dma_out);
443 ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
444 ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
445
446 if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
447 ret = -ENOMEM;
448 goto out;
449 }
450
451 idesc = intf->altsetting;
452
453 if (idesc->desc.bNumEndpoints < 2) {
454 ret = -ENODEV;
455 goto out;
456 }
457
458 ir->rc = rc;
459 ir->dev = &intf->dev;
460 ir->udev = udev;
461 mutex_init(&ir->lock);
462
463 init_completion(&ir->completion);
464 pipeout = usb_sndintpipe(udev,
465 idesc->endpoint[1].desc.bEndpointAddress);
466 usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
467 iguanair_irq_out, ir, 1);
468 ir->urb_out->transfer_dma = ir->dma_out;
469 ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
470
471 pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
472 usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
473 iguanair_rx, ir, 1);
474 ir->urb_in->transfer_dma = ir->dma_in;
475 ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
476
477 ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
478 if (ret) {
479 dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
480 goto out;
481 }
482
483 ret = iguanair_get_features(ir);
484 if (ret)
485 goto out2;
486
487 snprintf(ir->name, sizeof(ir->name),
488 "IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
489
490 usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
491
492 rc->input_name = ir->name;
493 rc->input_phys = ir->phys;
494 usb_to_input_id(ir->udev, &rc->input_id);
495 rc->dev.parent = &intf->dev;
496 rc->driver_type = RC_DRIVER_IR_RAW;
497 rc->allowed_protos = RC_BIT_ALL;
498 rc->priv = ir;
499 rc->open = iguanair_open;
500 rc->close = iguanair_close;
501 rc->s_tx_mask = iguanair_set_tx_mask;
502 rc->s_tx_carrier = iguanair_set_tx_carrier;
503 rc->tx_ir = iguanair_tx;
504 rc->driver_name = DRIVER_NAME;
505 rc->map_name = RC_MAP_RC6_MCE;
506 rc->timeout = MS_TO_NS(100);
507 rc->rx_resolution = RX_RESOLUTION;
508
509 iguanair_set_tx_carrier(rc, 38000);
510 iguanair_set_tx_mask(rc, 0);
511
512 ret = rc_register_device(rc);
513 if (ret < 0) {
514 dev_err(&intf->dev, "failed to register rc device %d", ret);
515 goto out2;
516 }
517
518 usb_set_intfdata(intf, ir);
519
520 return 0;
521out2:
522 usb_kill_urb(ir->urb_in);
523 usb_kill_urb(ir->urb_out);
524out:
525 if (ir) {
526 usb_free_urb(ir->urb_in);
527 usb_free_urb(ir->urb_out);
528 usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
529 usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
530 ir->dma_out);
531 }
532 rc_free_device(rc);
533 kfree(ir);
534 return ret;
535}
536
537static void iguanair_disconnect(struct usb_interface *intf)
538{
539 struct iguanair *ir = usb_get_intfdata(intf);
540
541 rc_unregister_device(ir->rc);
542 usb_set_intfdata(intf, NULL);
543 usb_kill_urb(ir->urb_in);
544 usb_kill_urb(ir->urb_out);
545 usb_free_urb(ir->urb_in);
546 usb_free_urb(ir->urb_out);
547 usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
548 usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
549 kfree(ir);
550}
551
552static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
553{
554 struct iguanair *ir = usb_get_intfdata(intf);
555 int rc = 0;
556
557 mutex_lock(&ir->lock);
558
559 if (ir->receiver_on) {
560 rc = iguanair_receiver(ir, false);
561 if (rc)
562 dev_warn(ir->dev, "failed to disable receiver for suspend\n");
563 }
564
565 usb_kill_urb(ir->urb_in);
566 usb_kill_urb(ir->urb_out);
567
568 mutex_unlock(&ir->lock);
569
570 return rc;
571}
572
573static int iguanair_resume(struct usb_interface *intf)
574{
575 struct iguanair *ir = usb_get_intfdata(intf);
576 int rc = 0;
577
578 mutex_lock(&ir->lock);
579
580 rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
581 if (rc)
582 dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
583
584 if (ir->receiver_on) {
585 rc = iguanair_receiver(ir, true);
586 if (rc)
587 dev_warn(ir->dev, "failed to enable receiver after resume\n");
588 }
589
590 mutex_unlock(&ir->lock);
591
592 return rc;
593}
594
595static const struct usb_device_id iguanair_table[] = {
596 { USB_DEVICE(0x1781, 0x0938) },
597 { }
598};
599
600static struct usb_driver iguanair_driver = {
601 .name = DRIVER_NAME,
602 .probe = iguanair_probe,
603 .disconnect = iguanair_disconnect,
604 .suspend = iguanair_suspend,
605 .resume = iguanair_resume,
606 .reset_resume = iguanair_resume,
607 .id_table = iguanair_table,
608 .soft_unbind = 1
609};
610
611module_usb_driver(iguanair_driver);
612
613MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
614MODULE_AUTHOR("Sean Young <sean@mess.org>");
615MODULE_LICENSE("GPL");
616MODULE_DEVICE_TABLE(usb, iguanair_table);
617
618
