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Linux/drivers/media/rc/iguanair.c

  1 /*
  2  * IguanaWorks USB IR Transceiver support
  3  *
  4  * Copyright (C) 2012 Sean Young <sean@mess.org>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU 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 USA
 19  */
 20 
 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 
 33 struct 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         /* receiver support */
 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         /* transmit support */
 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 
 80 struct packet {
 81         uint16_t start;
 82         uint8_t direction;
 83         uint8_t cmd;
 84 };
 85 
 86 struct 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 
 95 static 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 
160 static 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 
194 static 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         /* if we sent an nop packet, do not expect a response */
202         if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
203                 complete(&ir->completion);
204 }
205 
206 static 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 
223 static int iguanair_get_features(struct iguanair *ir)
224 {
225         int rc;
226 
227         /*
228          * On cold boot, the iguanair initializes on the first packet
229          * received but does not process that packet. Send an empty
230          * packet.
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");
272 out:
273         return rc;
274 }
275 
276 static 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  * The iguana ir creates the carrier by busy spinning after each pulse or
290  * space. This is counted in CPU cycles, with the CPU running at 24MHz. It is
291  * broken down into 7-cycles and 4-cyles delays, with a preference for
292  * 4-cycle delays.
293  */
294 static 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                  * Calculate minimum number of 7 cycles needed so
313                  * we are left with a multiple of 4; so we want to have
314                  * (sevens * 7) & 3 == cycles & 3
315                  */
316                 sevens = (4 - cycles) & 3;
317                 fours = (cycles - sevens * 7) / 4;
318 
319                 /* magic happens here */
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 
329 static 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 
343 static 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         /* convert from us to carrier periods */
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 
386 out:
387         mutex_unlock(&ir->lock);
388 
389         return rc ? rc : count;
390 }
391 
392 static 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 
408 static 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 
423 static 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;
521 out2:
522         usb_kill_urb(ir->urb_in);
523         usb_kill_urb(ir->urb_out);
524 out:
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 
537 static 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 
552 static 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 
573 static 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 
595 static const struct usb_device_id iguanair_table[] = {
596         { USB_DEVICE(0x1781, 0x0938) },
597         { }
598 };
599 
600 static 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        /* we want to disable receiver on unbind */
609 };
610 
611 module_usb_driver(iguanair_driver);
612 
613 MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
614 MODULE_AUTHOR("Sean Young <sean@mess.org>");
615 MODULE_LICENSE("GPL");
616 MODULE_DEVICE_TABLE(usb, iguanair_table);
617 
618 

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