2 * IguanaWorks USB IR Transceiver support
4 * Copyright (C) 2012 Sean Young <sean@mess.org>
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.
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.
17 #include <linux/device.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/usb.h>
21 #include <linux/usb/input.h>
22 #include <linux/slab.h>
23 #include <linux/completion.h>
24 #include <media/rc-core.h>
26 #define DRIVER_NAME "iguanair"
33 struct usb_device *udev;
37 uint8_t cycle_overhead;
41 /* receiver support */
43 dma_addr_t dma_in, dma_out;
45 struct urb *urb_in, *urb_out;
46 struct completion completion;
48 /* transmit support */
51 struct send_packet *packet;
58 #define CMD_GET_VERSION 0x01
59 #define CMD_GET_BUFSIZE 0x11
60 #define CMD_GET_FEATURES 0x10
62 #define CMD_EXECUTE 0x1f
63 #define CMD_RX_OVERFLOW 0x31
64 #define CMD_TX_OVERFLOW 0x32
65 #define CMD_RECEIVER_ON 0x12
66 #define CMD_RECEIVER_OFF 0x14
71 #define MAX_IN_PACKET 8u
72 #define MAX_OUT_PACKET (sizeof(struct send_packet) + BUF_SIZE)
74 #define RX_RESOLUTION 21333
91 static void process_ir_data(struct iguanair *ir, unsigned len)
93 if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
94 switch (ir->buf_in[3]) {
97 ir->version = (ir->buf_in[5] << 8) |
99 complete(&ir->completion);
102 case CMD_GET_BUFSIZE:
104 ir->bufsize = ir->buf_in[4];
105 complete(&ir->completion);
108 case CMD_GET_FEATURES:
110 ir->cycle_overhead = ir->buf_in[5];
111 complete(&ir->completion);
114 case CMD_TX_OVERFLOW:
115 ir->tx_overflow = true;
117 case CMD_RECEIVER_OFF:
118 case CMD_RECEIVER_ON:
120 complete(&ir->completion);
122 case CMD_RX_OVERFLOW:
123 dev_warn(ir->dev, "receive overflow\n");
124 ir_raw_event_reset(ir->rc);
127 dev_warn(ir->dev, "control code %02x received\n",
131 } else if (len >= 7) {
132 struct ir_raw_event rawir = {};
136 for (i = 0; i < 7; i++) {
137 if (ir->buf_in[i] == 0x80) {
139 rawir.duration = US_TO_NS(21845);
141 rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
142 rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
146 if (ir_raw_event_store_with_filter(ir->rc, &rawir))
151 ir_raw_event_handle(ir->rc);
155 static void iguanair_rx(struct urb *urb)
169 switch (urb->status) {
171 process_ir_data(ir, urb->actual_length);
180 dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
184 rc = usb_submit_urb(urb, GFP_ATOMIC);
185 if (rc && rc != -ENODEV)
186 dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
189 static void iguanair_irq_out(struct urb *urb)
191 struct iguanair *ir = urb->context;
194 dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
196 /* if we sent an nop packet, do not expect a response */
197 if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
198 complete(&ir->completion);
201 static int iguanair_send(struct iguanair *ir, unsigned size)
205 reinit_completion(&ir->completion);
207 ir->urb_out->transfer_buffer_length = size;
208 rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
212 if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
218 static int iguanair_get_features(struct iguanair *ir)
223 * On cold boot, the iguanair initializes on the first packet
224 * received but does not process that packet. Send an empty
227 ir->packet->header.start = 0;
228 ir->packet->header.direction = DIR_OUT;
229 ir->packet->header.cmd = CMD_NOP;
230 iguanair_send(ir, sizeof(ir->packet->header));
232 ir->packet->header.cmd = CMD_GET_VERSION;
233 rc = iguanair_send(ir, sizeof(ir->packet->header));
235 dev_info(ir->dev, "failed to get version\n");
239 if (ir->version < 0x205) {
240 dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
246 ir->cycle_overhead = 65;
248 ir->packet->header.cmd = CMD_GET_BUFSIZE;
250 rc = iguanair_send(ir, sizeof(ir->packet->header));
252 dev_info(ir->dev, "failed to get buffer size\n");
256 if (ir->bufsize > BUF_SIZE) {
257 dev_info(ir->dev, "buffer size %u larger than expected\n",
259 ir->bufsize = BUF_SIZE;
262 ir->packet->header.cmd = CMD_GET_FEATURES;
264 rc = iguanair_send(ir, sizeof(ir->packet->header));
266 dev_info(ir->dev, "failed to get features\n");
271 static int iguanair_receiver(struct iguanair *ir, bool enable)
273 ir->packet->header.start = 0;
274 ir->packet->header.direction = DIR_OUT;
275 ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
278 ir_raw_event_reset(ir->rc);
280 return iguanair_send(ir, sizeof(ir->packet->header));
284 * The iguanair creates the carrier by busy spinning after each half period.
285 * This is counted in CPU cycles, with the CPU running at 24MHz. It is
286 * broken down into 7-cycles and 4-cyles delays, with a preference for
287 * 4-cycle delays, minus the overhead of the loop itself (cycle_overhead).
289 static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
291 struct iguanair *ir = dev->priv;
293 if (carrier < 25000 || carrier > 150000)
296 mutex_lock(&ir->lock);
298 if (carrier != ir->carrier) {
299 uint32_t cycles, fours, sevens;
301 ir->carrier = carrier;
303 cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
307 * Calculate minimum number of 7 cycles needed so
308 * we are left with a multiple of 4; so we want to have
309 * (sevens * 7) & 3 == cycles & 3
311 sevens = (4 - cycles) & 3;
312 fours = (cycles - sevens * 7) / 4;
315 * The firmware interprets these values as a relative offset
316 * for a branch. Immediately following the branches, there
317 * 4 instructions of 7 cycles (2 bytes each) and 110
318 * instructions of 4 cycles (1 byte each). A relative branch
319 * of 0 will execute all of them, branch further for less
322 ir->packet->busy7 = (4 - sevens) * 2;
323 ir->packet->busy4 = 110 - fours;
326 mutex_unlock(&ir->lock);
331 static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
333 struct iguanair *ir = dev->priv;
338 mutex_lock(&ir->lock);
339 ir->packet->channels = mask << 4;
340 mutex_unlock(&ir->lock);
345 static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
347 struct iguanair *ir = dev->priv;
348 unsigned int i, size, p, periods;
351 mutex_lock(&ir->lock);
353 /* convert from us to carrier periods */
354 for (i = size = 0; i < count; i++) {
355 periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
357 p = min(periods, 127u);
358 if (size >= ir->bufsize) {
362 ir->packet->payload[size++] = p | ((i & 1) ? 0x80 : 0);
367 ir->packet->header.start = 0;
368 ir->packet->header.direction = DIR_OUT;
369 ir->packet->header.cmd = CMD_SEND;
370 ir->packet->length = size;
372 ir->tx_overflow = false;
374 rc = iguanair_send(ir, sizeof(*ir->packet) + size);
376 if (rc == 0 && ir->tx_overflow)
380 mutex_unlock(&ir->lock);
382 return rc ? rc : count;
385 static int iguanair_open(struct rc_dev *rdev)
387 struct iguanair *ir = rdev->priv;
390 mutex_lock(&ir->lock);
392 rc = iguanair_receiver(ir, true);
394 ir->receiver_on = true;
396 mutex_unlock(&ir->lock);
401 static void iguanair_close(struct rc_dev *rdev)
403 struct iguanair *ir = rdev->priv;
406 mutex_lock(&ir->lock);
408 rc = iguanair_receiver(ir, false);
409 ir->receiver_on = false;
410 if (rc && rc != -ENODEV)
411 dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
413 mutex_unlock(&ir->lock);
416 static int iguanair_probe(struct usb_interface *intf,
417 const struct usb_device_id *id)
419 struct usb_device *udev = interface_to_usbdev(intf);
422 int ret, pipein, pipeout;
423 struct usb_host_interface *idesc;
425 ir = kzalloc(sizeof(*ir), GFP_KERNEL);
426 rc = rc_allocate_device(RC_DRIVER_IR_RAW);
432 ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
434 ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
436 ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
437 ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
439 if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
444 idesc = intf->altsetting;
446 if (idesc->desc.bNumEndpoints < 2) {
452 ir->dev = &intf->dev;
454 mutex_init(&ir->lock);
456 init_completion(&ir->completion);
457 pipeout = usb_sndintpipe(udev,
458 idesc->endpoint[1].desc.bEndpointAddress);
459 usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
460 iguanair_irq_out, ir, 1);
461 ir->urb_out->transfer_dma = ir->dma_out;
462 ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
464 pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
465 usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
467 ir->urb_in->transfer_dma = ir->dma_in;
468 ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
470 ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
472 dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
476 ret = iguanair_get_features(ir);
480 snprintf(ir->name, sizeof(ir->name),
481 "IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
483 usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
485 rc->device_name = ir->name;
486 rc->input_phys = ir->phys;
487 usb_to_input_id(ir->udev, &rc->input_id);
488 rc->dev.parent = &intf->dev;
489 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
491 rc->open = iguanair_open;
492 rc->close = iguanair_close;
493 rc->s_tx_mask = iguanair_set_tx_mask;
494 rc->s_tx_carrier = iguanair_set_tx_carrier;
495 rc->tx_ir = iguanair_tx;
496 rc->driver_name = DRIVER_NAME;
497 rc->map_name = RC_MAP_RC6_MCE;
499 rc->timeout = IR_DEFAULT_TIMEOUT;
500 rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
501 rc->rx_resolution = RX_RESOLUTION;
503 iguanair_set_tx_carrier(rc, 38000);
504 iguanair_set_tx_mask(rc, 0);
506 ret = rc_register_device(rc);
508 dev_err(&intf->dev, "failed to register rc device %d", ret);
512 usb_set_intfdata(intf, ir);
516 usb_kill_urb(ir->urb_in);
517 usb_kill_urb(ir->urb_out);
520 usb_free_urb(ir->urb_in);
521 usb_free_urb(ir->urb_out);
522 usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
523 usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
531 static void iguanair_disconnect(struct usb_interface *intf)
533 struct iguanair *ir = usb_get_intfdata(intf);
535 rc_unregister_device(ir->rc);
536 usb_set_intfdata(intf, NULL);
537 usb_kill_urb(ir->urb_in);
538 usb_kill_urb(ir->urb_out);
539 usb_free_urb(ir->urb_in);
540 usb_free_urb(ir->urb_out);
541 usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
542 usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
546 static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
548 struct iguanair *ir = usb_get_intfdata(intf);
551 mutex_lock(&ir->lock);
553 if (ir->receiver_on) {
554 rc = iguanair_receiver(ir, false);
556 dev_warn(ir->dev, "failed to disable receiver for suspend\n");
559 usb_kill_urb(ir->urb_in);
560 usb_kill_urb(ir->urb_out);
562 mutex_unlock(&ir->lock);
567 static int iguanair_resume(struct usb_interface *intf)
569 struct iguanair *ir = usb_get_intfdata(intf);
572 mutex_lock(&ir->lock);
574 rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
576 dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
578 if (ir->receiver_on) {
579 rc = iguanair_receiver(ir, true);
581 dev_warn(ir->dev, "failed to enable receiver after resume\n");
584 mutex_unlock(&ir->lock);
589 static const struct usb_device_id iguanair_table[] = {
590 { USB_DEVICE(0x1781, 0x0938) },
594 static struct usb_driver iguanair_driver = {
596 .probe = iguanair_probe,
597 .disconnect = iguanair_disconnect,
598 .suspend = iguanair_suspend,
599 .resume = iguanair_resume,
600 .reset_resume = iguanair_resume,
601 .id_table = iguanair_table,
602 .soft_unbind = 1 /* we want to disable receiver on unbind */
605 module_usb_driver(iguanair_driver);
607 MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
608 MODULE_AUTHOR("Sean Young <sean@mess.org>");
609 MODULE_LICENSE("GPL");
610 MODULE_DEVICE_TABLE(usb, iguanair_table);