1
2
3
4
5
6
7
8#include <linux/module.h>
9#include <linux/usb.h>
10#include <linux/usb/input.h>
11#include <linux/slab.h>
12#include <linux/leds.h>
13#include <media/rc-core.h>
14
15#define DRIVER_NAME "ttusbir"
16#define DRIVER_DESC "TechnoTrend USB IR Receiver"
17
18
19
20
21
22#define NUM_URBS 4
23#define NS_PER_BYTE 62500
24#define NS_PER_BIT (NS_PER_BYTE/8)
25
26struct ttusbir {
27 struct rc_dev *rc;
28 struct device *dev;
29 struct usb_device *udev;
30
31 struct urb *urb[NUM_URBS];
32
33 struct led_classdev led;
34 struct urb *bulk_urb;
35 uint8_t bulk_buffer[5];
36 int bulk_out_endp, iso_in_endp;
37 bool led_on, is_led_on;
38 atomic_t led_complete;
39
40 char phys[64];
41};
42
43static enum led_brightness ttusbir_brightness_get(struct led_classdev *led_dev)
44{
45 struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
46
47 return tt->led_on ? LED_FULL : LED_OFF;
48}
49
50static void ttusbir_set_led(struct ttusbir *tt)
51{
52 int ret;
53
54 smp_mb();
55
56 if (tt->led_on != tt->is_led_on && tt->udev &&
57 atomic_add_unless(&tt->led_complete, 1, 1)) {
58 tt->bulk_buffer[4] = tt->is_led_on = tt->led_on;
59 ret = usb_submit_urb(tt->bulk_urb, GFP_ATOMIC);
60 if (ret) {
61 dev_warn(tt->dev, "failed to submit bulk urb: %d\n",
62 ret);
63 atomic_dec(&tt->led_complete);
64 }
65 }
66}
67
68static void ttusbir_brightness_set(struct led_classdev *led_dev, enum
69 led_brightness brightness)
70{
71 struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
72
73 tt->led_on = brightness != LED_OFF;
74
75 ttusbir_set_led(tt);
76}
77
78
79
80
81static void ttusbir_bulk_complete(struct urb *urb)
82{
83 struct ttusbir *tt = urb->context;
84
85 atomic_dec(&tt->led_complete);
86
87 switch (urb->status) {
88 case 0:
89 break;
90 case -ECONNRESET:
91 case -ENOENT:
92 case -ESHUTDOWN:
93 usb_unlink_urb(urb);
94 return;
95 case -EPIPE:
96 default:
97 dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
98 break;
99 }
100
101 ttusbir_set_led(tt);
102}
103
104
105
106
107
108
109static void ttusbir_process_ir_data(struct ttusbir *tt, uint8_t *buf)
110{
111 struct ir_raw_event rawir = {};
112 unsigned i, v, b;
113 bool event = false;
114
115 for (i = 0; i < 128; i++) {
116 v = buf[i] & 0xfe;
117 switch (v) {
118 case 0xfe:
119 rawir.pulse = false;
120 rawir.duration = NS_PER_BYTE;
121 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
122 event = true;
123 break;
124 case 0:
125 rawir.pulse = true;
126 rawir.duration = NS_PER_BYTE;
127 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
128 event = true;
129 break;
130 default:
131
132 if (v & 2) {
133 b = ffz(v | 1);
134 rawir.pulse = true;
135 } else {
136 b = ffs(v) - 1;
137 rawir.pulse = false;
138 }
139
140 rawir.duration = NS_PER_BIT * (8 - b);
141 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
142 event = true;
143
144 rawir.pulse = !rawir.pulse;
145 rawir.duration = NS_PER_BIT * b;
146 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
147 event = true;
148 break;
149 }
150 }
151
152
153 if (event)
154 ir_raw_event_handle(tt->rc);
155}
156
157static void ttusbir_urb_complete(struct urb *urb)
158{
159 struct ttusbir *tt = urb->context;
160 int rc;
161
162 switch (urb->status) {
163 case 0:
164 ttusbir_process_ir_data(tt, urb->transfer_buffer);
165 break;
166 case -ECONNRESET:
167 case -ENOENT:
168 case -ESHUTDOWN:
169 usb_unlink_urb(urb);
170 return;
171 case -EPIPE:
172 default:
173 dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
174 break;
175 }
176
177 rc = usb_submit_urb(urb, GFP_ATOMIC);
178 if (rc && rc != -ENODEV)
179 dev_warn(tt->dev, "failed to resubmit urb: %d\n", rc);
180}
181
182static int ttusbir_probe(struct usb_interface *intf,
183 const struct usb_device_id *id)
184{
185 struct ttusbir *tt;
186 struct usb_interface_descriptor *idesc;
187 struct usb_endpoint_descriptor *desc;
188 struct rc_dev *rc;
189 int i, j, ret;
190 int altsetting = -1;
191
192 tt = kzalloc(sizeof(*tt), GFP_KERNEL);
193 rc = rc_allocate_device(RC_DRIVER_IR_RAW);
194 if (!tt || !rc) {
195 ret = -ENOMEM;
196 goto out;
197 }
198
199
200 for (i = 0; i < intf->num_altsetting && altsetting == -1; i++) {
201 int max_packet, bulk_out_endp = -1, iso_in_endp = -1;
202
203 idesc = &intf->altsetting[i].desc;
204
205 for (j = 0; j < idesc->bNumEndpoints; j++) {
206 desc = &intf->altsetting[i].endpoint[j].desc;
207 max_packet = le16_to_cpu(desc->wMaxPacketSize);
208 if (usb_endpoint_dir_in(desc) &&
209 usb_endpoint_xfer_isoc(desc) &&
210 max_packet == 0x10)
211 iso_in_endp = j;
212 else if (usb_endpoint_dir_out(desc) &&
213 usb_endpoint_xfer_bulk(desc) &&
214 max_packet == 0x20)
215 bulk_out_endp = j;
216
217 if (bulk_out_endp != -1 && iso_in_endp != -1) {
218 tt->bulk_out_endp = bulk_out_endp;
219 tt->iso_in_endp = iso_in_endp;
220 altsetting = i;
221 break;
222 }
223 }
224 }
225
226 if (altsetting == -1) {
227 dev_err(&intf->dev, "cannot find expected altsetting\n");
228 ret = -ENODEV;
229 goto out;
230 }
231
232 tt->dev = &intf->dev;
233 tt->udev = interface_to_usbdev(intf);
234 tt->rc = rc;
235
236 ret = usb_set_interface(tt->udev, 0, altsetting);
237 if (ret)
238 goto out;
239
240 for (i = 0; i < NUM_URBS; i++) {
241 struct urb *urb = usb_alloc_urb(8, GFP_KERNEL);
242 void *buffer;
243
244 if (!urb) {
245 ret = -ENOMEM;
246 goto out;
247 }
248
249 urb->dev = tt->udev;
250 urb->context = tt;
251 urb->pipe = usb_rcvisocpipe(tt->udev, tt->iso_in_endp);
252 urb->interval = 1;
253 buffer = usb_alloc_coherent(tt->udev, 128, GFP_KERNEL,
254 &urb->transfer_dma);
255 if (!buffer) {
256 usb_free_urb(urb);
257 ret = -ENOMEM;
258 goto out;
259 }
260 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP | URB_ISO_ASAP;
261 urb->transfer_buffer = buffer;
262 urb->complete = ttusbir_urb_complete;
263 urb->number_of_packets = 8;
264 urb->transfer_buffer_length = 128;
265
266 for (j = 0; j < 8; j++) {
267 urb->iso_frame_desc[j].offset = j * 16;
268 urb->iso_frame_desc[j].length = 16;
269 }
270
271 tt->urb[i] = urb;
272 }
273
274 tt->bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
275 if (!tt->bulk_urb) {
276 ret = -ENOMEM;
277 goto out;
278 }
279
280 tt->bulk_buffer[0] = 0xaa;
281 tt->bulk_buffer[1] = 0x01;
282 tt->bulk_buffer[2] = 0x05;
283 tt->bulk_buffer[3] = 0x01;
284
285 usb_fill_bulk_urb(tt->bulk_urb, tt->udev, usb_sndbulkpipe(tt->udev,
286 tt->bulk_out_endp), tt->bulk_buffer, sizeof(tt->bulk_buffer),
287 ttusbir_bulk_complete, tt);
288
289 tt->led.name = "ttusbir:green:power";
290 tt->led.default_trigger = "rc-feedback";
291 tt->led.brightness_set = ttusbir_brightness_set;
292 tt->led.brightness_get = ttusbir_brightness_get;
293 tt->is_led_on = tt->led_on = true;
294 atomic_set(&tt->led_complete, 0);
295 ret = led_classdev_register(&intf->dev, &tt->led);
296 if (ret)
297 goto out;
298
299 usb_make_path(tt->udev, tt->phys, sizeof(tt->phys));
300
301 rc->device_name = DRIVER_DESC;
302 rc->input_phys = tt->phys;
303 usb_to_input_id(tt->udev, &rc->input_id);
304 rc->dev.parent = &intf->dev;
305 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
306 rc->priv = tt;
307 rc->driver_name = DRIVER_NAME;
308 rc->map_name = RC_MAP_TT_1500;
309 rc->min_timeout = 1;
310 rc->timeout = IR_DEFAULT_TIMEOUT;
311 rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
312
313
314
315
316
317 rc->rx_resolution = NS_PER_BIT;
318
319 ret = rc_register_device(rc);
320 if (ret) {
321 dev_err(&intf->dev, "failed to register rc device %d\n", ret);
322 goto out2;
323 }
324
325 usb_set_intfdata(intf, tt);
326
327 for (i = 0; i < NUM_URBS; i++) {
328 ret = usb_submit_urb(tt->urb[i], GFP_KERNEL);
329 if (ret) {
330 dev_err(tt->dev, "failed to submit urb %d\n", ret);
331 goto out3;
332 }
333 }
334
335 return 0;
336out3:
337 rc_unregister_device(rc);
338 rc = NULL;
339out2:
340 led_classdev_unregister(&tt->led);
341out:
342 if (tt) {
343 for (i = 0; i < NUM_URBS && tt->urb[i]; i++) {
344 struct urb *urb = tt->urb[i];
345
346 usb_kill_urb(urb);
347 usb_free_coherent(tt->udev, 128, urb->transfer_buffer,
348 urb->transfer_dma);
349 usb_free_urb(urb);
350 }
351 usb_kill_urb(tt->bulk_urb);
352 usb_free_urb(tt->bulk_urb);
353 kfree(tt);
354 }
355 rc_free_device(rc);
356
357 return ret;
358}
359
360static void ttusbir_disconnect(struct usb_interface *intf)
361{
362 struct ttusbir *tt = usb_get_intfdata(intf);
363 struct usb_device *udev = tt->udev;
364 int i;
365
366 tt->udev = NULL;
367
368 rc_unregister_device(tt->rc);
369 led_classdev_unregister(&tt->led);
370 for (i = 0; i < NUM_URBS; i++) {
371 usb_kill_urb(tt->urb[i]);
372 usb_free_coherent(udev, 128, tt->urb[i]->transfer_buffer,
373 tt->urb[i]->transfer_dma);
374 usb_free_urb(tt->urb[i]);
375 }
376 usb_kill_urb(tt->bulk_urb);
377 usb_free_urb(tt->bulk_urb);
378 usb_set_intfdata(intf, NULL);
379 kfree(tt);
380}
381
382static int ttusbir_suspend(struct usb_interface *intf, pm_message_t message)
383{
384 struct ttusbir *tt = usb_get_intfdata(intf);
385 int i;
386
387 for (i = 0; i < NUM_URBS; i++)
388 usb_kill_urb(tt->urb[i]);
389
390 led_classdev_suspend(&tt->led);
391 usb_kill_urb(tt->bulk_urb);
392
393 return 0;
394}
395
396static int ttusbir_resume(struct usb_interface *intf)
397{
398 struct ttusbir *tt = usb_get_intfdata(intf);
399 int i, rc;
400
401 tt->is_led_on = true;
402 led_classdev_resume(&tt->led);
403
404 for (i = 0; i < NUM_URBS; i++) {
405 rc = usb_submit_urb(tt->urb[i], GFP_KERNEL);
406 if (rc) {
407 dev_warn(tt->dev, "failed to submit urb: %d\n", rc);
408 break;
409 }
410 }
411
412 return rc;
413}
414
415static const struct usb_device_id ttusbir_table[] = {
416 { USB_DEVICE(0x0b48, 0x2003) },
417 { }
418};
419
420static struct usb_driver ttusbir_driver = {
421 .name = DRIVER_NAME,
422 .id_table = ttusbir_table,
423 .probe = ttusbir_probe,
424 .suspend = ttusbir_suspend,
425 .resume = ttusbir_resume,
426 .reset_resume = ttusbir_resume,
427 .disconnect = ttusbir_disconnect,
428};
429
430module_usb_driver(ttusbir_driver);
431
432MODULE_DESCRIPTION(DRIVER_DESC);
433MODULE_AUTHOR("Sean Young <sean@mess.org>");
434MODULE_LICENSE("GPL");
435MODULE_DEVICE_TABLE(usb, ttusbir_table);
436
437
