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21#include <linux/module.h>
22#include <linux/usb.h>
23#include <linux/usb/input.h>
24#include <linux/slab.h>
25#include <linux/leds.h>
26#include <media/rc-core.h>
27
28#define DRIVER_NAME "ttusbir"
29#define DRIVER_DESC "TechnoTrend USB IR Receiver"
30
31
32
33
34
35#define NUM_URBS 4
36#define NS_PER_BYTE 62500
37#define NS_PER_BIT (NS_PER_BYTE/8)
38
39struct ttusbir {
40 struct rc_dev *rc;
41 struct device *dev;
42 struct usb_device *udev;
43
44 struct urb *urb[NUM_URBS];
45
46 struct led_classdev led;
47 struct urb *bulk_urb;
48 uint8_t bulk_buffer[5];
49 int bulk_out_endp, iso_in_endp;
50 bool led_on, is_led_on;
51 atomic_t led_complete;
52
53 char phys[64];
54};
55
56static enum led_brightness ttusbir_brightness_get(struct led_classdev *led_dev)
57{
58 struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
59
60 return tt->led_on ? LED_FULL : LED_OFF;
61}
62
63static void ttusbir_set_led(struct ttusbir *tt)
64{
65 int ret;
66
67 smp_mb();
68
69 if (tt->led_on != tt->is_led_on && tt->udev &&
70 atomic_add_unless(&tt->led_complete, 1, 1)) {
71 tt->bulk_buffer[4] = tt->is_led_on = tt->led_on;
72 ret = usb_submit_urb(tt->bulk_urb, GFP_ATOMIC);
73 if (ret) {
74 dev_warn(tt->dev, "failed to submit bulk urb: %d\n",
75 ret);
76 atomic_dec(&tt->led_complete);
77 }
78 }
79}
80
81static void ttusbir_brightness_set(struct led_classdev *led_dev, enum
82 led_brightness brightness)
83{
84 struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
85
86 tt->led_on = brightness != LED_OFF;
87
88 ttusbir_set_led(tt);
89}
90
91
92
93
94static void ttusbir_bulk_complete(struct urb *urb)
95{
96 struct ttusbir *tt = urb->context;
97
98 atomic_dec(&tt->led_complete);
99
100 switch (urb->status) {
101 case 0:
102 break;
103 case -ECONNRESET:
104 case -ENOENT:
105 case -ESHUTDOWN:
106 usb_unlink_urb(urb);
107 return;
108 case -EPIPE:
109 default:
110 dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
111 break;
112 }
113
114 ttusbir_set_led(tt);
115}
116
117
118
119
120
121
122static void ttusbir_process_ir_data(struct ttusbir *tt, uint8_t *buf)
123{
124 struct ir_raw_event rawir;
125 unsigned i, v, b;
126 bool event = false;
127
128 init_ir_raw_event(&rawir);
129
130 for (i = 0; i < 128; i++) {
131 v = buf[i] & 0xfe;
132 switch (v) {
133 case 0xfe:
134 rawir.pulse = false;
135 rawir.duration = NS_PER_BYTE;
136 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
137 event = true;
138 break;
139 case 0:
140 rawir.pulse = true;
141 rawir.duration = NS_PER_BYTE;
142 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
143 event = true;
144 break;
145 default:
146
147 if (v & 2) {
148 b = ffz(v | 1);
149 rawir.pulse = true;
150 } else {
151 b = ffs(v) - 1;
152 rawir.pulse = false;
153 }
154
155 rawir.duration = NS_PER_BIT * (8 - b);
156 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
157 event = true;
158
159 rawir.pulse = !rawir.pulse;
160 rawir.duration = NS_PER_BIT * b;
161 if (ir_raw_event_store_with_filter(tt->rc, &rawir))
162 event = true;
163 break;
164 }
165 }
166
167
168 if (event)
169 ir_raw_event_handle(tt->rc);
170}
171
172static void ttusbir_urb_complete(struct urb *urb)
173{
174 struct ttusbir *tt = urb->context;
175 int rc;
176
177 switch (urb->status) {
178 case 0:
179 ttusbir_process_ir_data(tt, urb->transfer_buffer);
180 break;
181 case -ECONNRESET:
182 case -ENOENT:
183 case -ESHUTDOWN:
184 usb_unlink_urb(urb);
185 return;
186 case -EPIPE:
187 default:
188 dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
189 break;
190 }
191
192 rc = usb_submit_urb(urb, GFP_ATOMIC);
193 if (rc && rc != -ENODEV)
194 dev_warn(tt->dev, "failed to resubmit urb: %d\n", rc);
195}
196
197static int ttusbir_probe(struct usb_interface *intf,
198 const struct usb_device_id *id)
199{
200 struct ttusbir *tt;
201 struct usb_interface_descriptor *idesc;
202 struct usb_endpoint_descriptor *desc;
203 struct rc_dev *rc;
204 int i, j, ret;
205 int altsetting = -1;
206
207 tt = kzalloc(sizeof(*tt), GFP_KERNEL);
208 rc = rc_allocate_device();
209 if (!tt || !rc) {
210 ret = -ENOMEM;
211 goto out;
212 }
213
214
215 for (i = 0; i < intf->num_altsetting && altsetting == -1; i++) {
216 int max_packet, bulk_out_endp = -1, iso_in_endp = -1;
217
218 idesc = &intf->altsetting[i].desc;
219
220 for (j = 0; j < idesc->bNumEndpoints; j++) {
221 desc = &intf->altsetting[i].endpoint[j].desc;
222 max_packet = le16_to_cpu(desc->wMaxPacketSize);
223 if (usb_endpoint_dir_in(desc) &&
224 usb_endpoint_xfer_isoc(desc) &&
225 max_packet == 0x10)
226 iso_in_endp = j;
227 else if (usb_endpoint_dir_out(desc) &&
228 usb_endpoint_xfer_bulk(desc) &&
229 max_packet == 0x20)
230 bulk_out_endp = j;
231
232 if (bulk_out_endp != -1 && iso_in_endp != -1) {
233 tt->bulk_out_endp = bulk_out_endp;
234 tt->iso_in_endp = iso_in_endp;
235 altsetting = i;
236 break;
237 }
238 }
239 }
240
241 if (altsetting == -1) {
242 dev_err(&intf->dev, "cannot find expected altsetting\n");
243 ret = -ENODEV;
244 goto out;
245 }
246
247 tt->dev = &intf->dev;
248 tt->udev = interface_to_usbdev(intf);
249 tt->rc = rc;
250
251 ret = usb_set_interface(tt->udev, 0, altsetting);
252 if (ret)
253 goto out;
254
255 for (i = 0; i < NUM_URBS; i++) {
256 struct urb *urb = usb_alloc_urb(8, GFP_KERNEL);
257 void *buffer;
258
259 if (!urb) {
260 ret = -ENOMEM;
261 goto out;
262 }
263
264 urb->dev = tt->udev;
265 urb->context = tt;
266 urb->pipe = usb_rcvisocpipe(tt->udev, tt->iso_in_endp);
267 urb->interval = 1;
268 buffer = usb_alloc_coherent(tt->udev, 128, GFP_KERNEL,
269 &urb->transfer_dma);
270 if (!buffer) {
271 usb_free_urb(urb);
272 ret = -ENOMEM;
273 goto out;
274 }
275 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP | URB_ISO_ASAP;
276 urb->transfer_buffer = buffer;
277 urb->complete = ttusbir_urb_complete;
278 urb->number_of_packets = 8;
279 urb->transfer_buffer_length = 128;
280
281 for (j = 0; j < 8; j++) {
282 urb->iso_frame_desc[j].offset = j * 16;
283 urb->iso_frame_desc[j].length = 16;
284 }
285
286 tt->urb[i] = urb;
287 }
288
289 tt->bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
290 if (!tt->bulk_urb) {
291 ret = -ENOMEM;
292 goto out;
293 }
294
295 tt->bulk_buffer[0] = 0xaa;
296 tt->bulk_buffer[1] = 0x01;
297 tt->bulk_buffer[2] = 0x05;
298 tt->bulk_buffer[3] = 0x01;
299
300 usb_fill_bulk_urb(tt->bulk_urb, tt->udev, usb_sndbulkpipe(tt->udev,
301 tt->bulk_out_endp), tt->bulk_buffer, sizeof(tt->bulk_buffer),
302 ttusbir_bulk_complete, tt);
303
304 tt->led.name = "ttusbir:green:power";
305 tt->led.default_trigger = "rc-feedback";
306 tt->led.brightness_set = ttusbir_brightness_set;
307 tt->led.brightness_get = ttusbir_brightness_get;
308 tt->is_led_on = tt->led_on = true;
309 atomic_set(&tt->led_complete, 0);
310 ret = led_classdev_register(&intf->dev, &tt->led);
311 if (ret)
312 goto out;
313
314 usb_make_path(tt->udev, tt->phys, sizeof(tt->phys));
315
316 rc->input_name = DRIVER_DESC;
317 rc->input_phys = tt->phys;
318 usb_to_input_id(tt->udev, &rc->input_id);
319 rc->dev.parent = &intf->dev;
320 rc->driver_type = RC_DRIVER_IR_RAW;
321 rc->allowed_protocols = RC_BIT_ALL;
322 rc->priv = tt;
323 rc->driver_name = DRIVER_NAME;
324 rc->map_name = RC_MAP_TT_1500;
325 rc->timeout = MS_TO_NS(100);
326
327
328
329
330 rc->rx_resolution = NS_PER_BIT;
331
332 ret = rc_register_device(rc);
333 if (ret) {
334 dev_err(&intf->dev, "failed to register rc device %d\n", ret);
335 goto out2;
336 }
337
338 usb_set_intfdata(intf, tt);
339
340 for (i = 0; i < NUM_URBS; i++) {
341 ret = usb_submit_urb(tt->urb[i], GFP_KERNEL);
342 if (ret) {
343 dev_err(tt->dev, "failed to submit urb %d\n", ret);
344 goto out3;
345 }
346 }
347
348 return 0;
349out3:
350 rc_unregister_device(rc);
351 rc = NULL;
352out2:
353 led_classdev_unregister(&tt->led);
354out:
355 if (tt) {
356 for (i = 0; i < NUM_URBS && tt->urb[i]; i++) {
357 struct urb *urb = tt->urb[i];
358
359 usb_kill_urb(urb);
360 usb_free_coherent(tt->udev, 128, urb->transfer_buffer,
361 urb->transfer_dma);
362 usb_free_urb(urb);
363 }
364 usb_kill_urb(tt->bulk_urb);
365 usb_free_urb(tt->bulk_urb);
366 kfree(tt);
367 }
368 rc_free_device(rc);
369
370 return ret;
371}
372
373static void ttusbir_disconnect(struct usb_interface *intf)
374{
375 struct ttusbir *tt = usb_get_intfdata(intf);
376 struct usb_device *udev = tt->udev;
377 int i;
378
379 tt->udev = NULL;
380
381 rc_unregister_device(tt->rc);
382 led_classdev_unregister(&tt->led);
383 for (i = 0; i < NUM_URBS; i++) {
384 usb_kill_urb(tt->urb[i]);
385 usb_free_coherent(udev, 128, tt->urb[i]->transfer_buffer,
386 tt->urb[i]->transfer_dma);
387 usb_free_urb(tt->urb[i]);
388 }
389 usb_kill_urb(tt->bulk_urb);
390 usb_free_urb(tt->bulk_urb);
391 usb_set_intfdata(intf, NULL);
392 kfree(tt);
393}
394
395static int ttusbir_suspend(struct usb_interface *intf, pm_message_t message)
396{
397 struct ttusbir *tt = usb_get_intfdata(intf);
398 int i;
399
400 for (i = 0; i < NUM_URBS; i++)
401 usb_kill_urb(tt->urb[i]);
402
403 led_classdev_suspend(&tt->led);
404 usb_kill_urb(tt->bulk_urb);
405
406 return 0;
407}
408
409static int ttusbir_resume(struct usb_interface *intf)
410{
411 struct ttusbir *tt = usb_get_intfdata(intf);
412 int i, rc;
413
414 tt->is_led_on = true;
415 led_classdev_resume(&tt->led);
416
417 for (i = 0; i < NUM_URBS; i++) {
418 rc = usb_submit_urb(tt->urb[i], GFP_KERNEL);
419 if (rc) {
420 dev_warn(tt->dev, "failed to submit urb: %d\n", rc);
421 break;
422 }
423 }
424
425 return rc;
426}
427
428static const struct usb_device_id ttusbir_table[] = {
429 { USB_DEVICE(0x0b48, 0x2003) },
430 { }
431};
432
433static struct usb_driver ttusbir_driver = {
434 .name = DRIVER_NAME,
435 .id_table = ttusbir_table,
436 .probe = ttusbir_probe,
437 .suspend = ttusbir_suspend,
438 .resume = ttusbir_resume,
439 .reset_resume = ttusbir_resume,
440 .disconnect = ttusbir_disconnect,
441};
442
443module_usb_driver(ttusbir_driver);
444
445MODULE_DESCRIPTION(DRIVER_DESC);
446MODULE_AUTHOR("Sean Young <sean@mess.org>");
447MODULE_LICENSE("GPL");
448MODULE_DEVICE_TABLE(usb, ttusbir_table);
449
450
