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Linux/drivers/media/rc/ttusbir.c

  1 /*
  2  * TechnoTrend USB IR Receiver
  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/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  * The Windows driver uses 8 URBS, the original lirc drivers has a
 32  * configurable amount (2 default, 4 max). This device generates about 125
 33  * messages per second (!), whether IR is idle or not.
 34  */
 35 #define NUM_URBS        4
 36 #define NS_PER_BYTE     62500
 37 #define NS_PER_BIT      (NS_PER_BYTE/8)
 38 
 39 struct 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 
 56 static 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 
 63 static 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 
 81 static 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  * The urb cannot be reused until the urb completes
 93  */
 94 static 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  * The data is one bit per sample, a set bit signifying silence and samples
119  * being MSB first. Bit 0 can contain garbage so take it to be whatever
120  * bit 1 is, so we don't have unexpected edges.
121  */
122 static 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                         /* one edge per byte */
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         /* don't wakeup when there's nothing to do */
168         if (event)
169                 ir_raw_event_handle(tt->rc);
170 }
171 
172 static 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 
197 static 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         /* find the correct alt setting */
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_set_allowed_protocols(rc, 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          * The precision is NS_PER_BIT, but since every 8th bit can be
328          * overwritten with garbage the accuracy is at best 2 * NS_PER_BIT.
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;
349 out3:
350         rc_unregister_device(rc);
351         rc = NULL;
352 out2:
353         led_classdev_unregister(&tt->led);
354 out:
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 
373 static 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 
395 static 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 
409 static 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 
428 static const struct usb_device_id ttusbir_table[] = {
429         { USB_DEVICE(0x0b48, 0x2003) },
430         { }
431 };
432 
433 static 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 
443 module_usb_driver(ttusbir_driver);
444 
445 MODULE_DESCRIPTION(DRIVER_DESC);
446 MODULE_AUTHOR("Sean Young <sean@mess.org>");
447 MODULE_LICENSE("GPL");
448 MODULE_DEVICE_TABLE(usb, ttusbir_table);
449 
450 

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