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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / media / video / zc0301 / zc0301_core.c
blob2c5665c824423360481ea49a5f388a4a79c76223
1 /***************************************************************************
2 * Video4Linux2 driver for ZC0301[P] Image Processor and Control Chip *
3 * *
4 * Copyright (C) 2006-2007 by Luca Risolia <luca.risolia@studio.unibo.it> *
5 * *
6 * Informations about the chip internals needed to enable the I2C protocol *
7 * have been taken from the documentation of the ZC030x Video4Linux1 *
8 * driver written by Andrew Birkett <andy@nobugs.org> *
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 * This program is distributed in the hope that it will be useful, *
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
18 * GNU General Public License for more details. *
19 * *
20 * You should have received a copy of the GNU General Public License *
21 * along with this program; if not, write to the Free Software *
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
23 ***************************************************************************/
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/param.h>
29 #include <linux/errno.h>
30 #include <linux/slab.h>
31 #include <linux/device.h>
32 #include <linux/fs.h>
33 #include <linux/delay.h>
34 #include <linux/compiler.h>
35 #include <linux/ioctl.h>
36 #include <linux/poll.h>
37 #include <linux/stat.h>
38 #include <linux/mm.h>
39 #include <linux/vmalloc.h>
40 #include <linux/page-flags.h>
41 #include <linux/byteorder/generic.h>
42 #include <asm/page.h>
43 #include <asm/uaccess.h>
44
45 #include "zc0301.h"
46
47 /*****************************************************************************/
48
49 #define ZC0301_MODULE_NAME "V4L2 driver for ZC0301[P] " \
50 "Image Processor and Control Chip"
51 #define ZC0301_MODULE_AUTHOR "(C) 2006-2007 Luca Risolia"
52 #define ZC0301_AUTHOR_EMAIL "<luca.risolia@studio.unibo.it>"
53 #define ZC0301_MODULE_LICENSE "GPL"
54 #define ZC0301_MODULE_VERSION "1:1.10"
55 #define ZC0301_MODULE_VERSION_CODE KERNEL_VERSION(1, 1, 10)
56
57 /*****************************************************************************/
58
59 MODULE_DEVICE_TABLE(usb, zc0301_id_table);
60
61 MODULE_AUTHOR(ZC0301_MODULE_AUTHOR " " ZC0301_AUTHOR_EMAIL);
62 MODULE_DESCRIPTION(ZC0301_MODULE_NAME);
63 MODULE_VERSION(ZC0301_MODULE_VERSION);
64 MODULE_LICENSE(ZC0301_MODULE_LICENSE);
65
66 static short video_nr[] = {[0 ... ZC0301_MAX_DEVICES-1] = -1};
67 module_param_array(video_nr, short, NULL, 0444);
68 MODULE_PARM_DESC(video_nr,
69 "\n<-1|n[,...]> Specify V4L2 minor mode number."
70 "\n -1 = use next available (default)"
71 "\n n = use minor number n (integer >= 0)"
72 "\nYou can specify up to "
73 __MODULE_STRING(ZC0301_MAX_DEVICES) " cameras this way."
74 "\nFor example:"
75 "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
76 "\nthe second registered camera and use auto for the first"
77 "\none and for every other camera."
78 "\n");
79
80 static short force_munmap[] = {[0 ... ZC0301_MAX_DEVICES-1] =
81 ZC0301_FORCE_MUNMAP};
82 module_param_array(force_munmap, bool, NULL, 0444);
83 MODULE_PARM_DESC(force_munmap,
84 "\n<0|1[,...]> Force the application to unmap previously"
85 "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
86 "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
87 "\nthis feature. This parameter is specific for each"
88 "\ndetected camera."
89 "\n 0 = do not force memory unmapping"
90 "\n 1 = force memory unmapping (save memory)"
91 "\nDefault value is "__MODULE_STRING(ZC0301_FORCE_MUNMAP)"."
92 "\n");
93
94 static unsigned int frame_timeout[] = {[0 ... ZC0301_MAX_DEVICES-1] =
95 ZC0301_FRAME_TIMEOUT};
96 module_param_array(frame_timeout, uint, NULL, 0644);
97 MODULE_PARM_DESC(frame_timeout,
98 "\n<n[,...]> Timeout for a video frame in seconds."
99 "\nThis parameter is specific for each detected camera."
100 "\nDefault value is "__MODULE_STRING(ZC0301_FRAME_TIMEOUT)"."
101 "\n");
102
103 #ifdef ZC0301_DEBUG
104 static unsigned short debug = ZC0301_DEBUG_LEVEL;
105 module_param(debug, ushort, 0644);
106 MODULE_PARM_DESC(debug,
107 "\n<n> Debugging information level, from 0 to 3:"
108 "\n0 = none (use carefully)"
109 "\n1 = critical errors"
110 "\n2 = significant informations"
111 "\n3 = more verbose messages"
112 "\nLevel 3 is useful for testing only, when only "
113 "one device is used."
114 "\nDefault value is "__MODULE_STRING(ZC0301_DEBUG_LEVEL)"."
115 "\n");
116 #endif
117
118 /*****************************************************************************/
119
120 static u32
121 zc0301_request_buffers(struct zc0301_device* cam, u32 count,
122 enum zc0301_io_method io)
123 {
124 struct v4l2_pix_format* p = &(cam->sensor.pix_format);
125 struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
126 const size_t imagesize = cam->module_param.force_munmap ||
127 io == IO_READ ?
128 (p->width * p->height * p->priv) / 8 :
129 (r->width * r->height * p->priv) / 8;
130 void* buff = NULL;
131 u32 i;
132
133 if (count > ZC0301_MAX_FRAMES)
134 count = ZC0301_MAX_FRAMES;
135
136 cam->nbuffers = count;
137 while (cam->nbuffers > 0) {
138 if ((buff = vmalloc_32_user(cam->nbuffers *
139 PAGE_ALIGN(imagesize))))
140 break;
141 cam->nbuffers--;
142 }
143
144 for (i = 0; i < cam->nbuffers; i++) {
145 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
146 cam->frame[i].buf.index = i;
147 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
148 cam->frame[i].buf.length = imagesize;
149 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
150 cam->frame[i].buf.sequence = 0;
151 cam->frame[i].buf.field = V4L2_FIELD_NONE;
152 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
153 cam->frame[i].buf.flags = 0;
154 }
155
156 return cam->nbuffers;
157 }
158
159
160 static void zc0301_release_buffers(struct zc0301_device* cam)
161 {
162 if (cam->nbuffers) {
163 vfree(cam->frame[0].bufmem);
164 cam->nbuffers = 0;
165 }
166 cam->frame_current = NULL;
167 }
168
169
170 static void zc0301_empty_framequeues(struct zc0301_device* cam)
171 {
172 u32 i;
173
174 INIT_LIST_HEAD(&cam->inqueue);
175 INIT_LIST_HEAD(&cam->outqueue);
176
177 for (i = 0; i < ZC0301_MAX_FRAMES; i++) {
178 cam->frame[i].state = F_UNUSED;
179 cam->frame[i].buf.bytesused = 0;
180 }
181 }
182
183
184 static void zc0301_requeue_outqueue(struct zc0301_device* cam)
185 {
186 struct zc0301_frame_t *i;
187
188 list_for_each_entry(i, &cam->outqueue, frame) {
189 i->state = F_QUEUED;
190 list_add(&i->frame, &cam->inqueue);
191 }
192
193 INIT_LIST_HEAD(&cam->outqueue);
194 }
195
196
197 static void zc0301_queue_unusedframes(struct zc0301_device* cam)
198 {
199 unsigned long lock_flags;
200 u32 i;
201
202 for (i = 0; i < cam->nbuffers; i++)
203 if (cam->frame[i].state == F_UNUSED) {
204 cam->frame[i].state = F_QUEUED;
205 spin_lock_irqsave(&cam->queue_lock, lock_flags);
206 list_add_tail(&cam->frame[i].frame, &cam->inqueue);
207 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
208 }
209 }
210
211 /*****************************************************************************/
212
213 int zc0301_write_reg(struct zc0301_device* cam, u16 index, u16 value)
214 {
215 struct usb_device* udev = cam->usbdev;
216 int res;
217
218 res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0xa0, 0x40,
219 value, index, NULL, 0, ZC0301_CTRL_TIMEOUT);
220 if (res < 0) {
221 DBG(3, "Failed to write a register (index 0x%04X, "
222 "value 0x%02X, error %d)",index, value, res);
223 return -1;
224 }
225
226 return 0;
227 }
228
229
230 int zc0301_read_reg(struct zc0301_device* cam, u16 index)
231 {
232 struct usb_device* udev = cam->usbdev;
233 u8* buff = cam->control_buffer;
234 int res;
235
236 res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0xa1, 0xc0,
237 0x0001, index, buff, 1, ZC0301_CTRL_TIMEOUT);
238 if (res < 0)
239 DBG(3, "Failed to read a register (index 0x%04X, error %d)",
240 index, res);
241
242 PDBGG("Read: index 0x%04X, value: 0x%04X", index, (int)(*buff));
243
244 return (res >= 0) ? (int)(*buff) : -1;
245 }
246
247
248 int zc0301_i2c_read(struct zc0301_device* cam, u16 address, u8 length)
249 {
250 int err = 0, res, r0, r1;
251
252 err += zc0301_write_reg(cam, 0x0092, address);
253 err += zc0301_write_reg(cam, 0x0090, 0x02);
254
255 msleep(1);
256
257 res = zc0301_read_reg(cam, 0x0091);
258 if (res < 0)
259 err += res;
260 r0 = zc0301_read_reg(cam, 0x0095);
261 if (r0 < 0)
262 err += r0;
263 r1 = zc0301_read_reg(cam, 0x0096);
264 if (r1 < 0)
265 err += r1;
266
267 res = (length <= 1) ? r0 : r0 | (r1 << 8);
268
269 if (err)
270 DBG(3, "I2C read failed at address 0x%04X, value: 0x%04X",
271 address, res);
272
273
274 PDBGG("I2C read: address 0x%04X, value: 0x%04X", address, res);
275
276 return err ? -1 : res;
277 }
278
279
280 int zc0301_i2c_write(struct zc0301_device* cam, u16 address, u16 value)
281 {
282 int err = 0, res;
283
284 err += zc0301_write_reg(cam, 0x0092, address);
285 err += zc0301_write_reg(cam, 0x0093, value & 0xff);
286 err += zc0301_write_reg(cam, 0x0094, value >> 8);
287 err += zc0301_write_reg(cam, 0x0090, 0x01);
288
289 msleep(1);
290
291 res = zc0301_read_reg(cam, 0x0091);
292 if (res < 0)
293 err += res;
294
295 if (err)
296 DBG(3, "I2C write failed at address 0x%04X, value: 0x%04X",
297 address, value);
298
299 PDBGG("I2C write: address 0x%04X, value: 0x%04X", address, value);
300
301 return err ? -1 : 0;
302 }
303
304 /*****************************************************************************/
305
306 static void zc0301_urb_complete(struct urb *urb)
307 {
308 struct zc0301_device* cam = urb->context;
309 struct zc0301_frame_t** f;
310 size_t imagesize;
311 u8 i;
312 int err = 0;
313
314 if (urb->status == -ENOENT)
315 return;
316
317 f = &cam->frame_current;
318
319 if (cam->stream == STREAM_INTERRUPT) {
320 cam->stream = STREAM_OFF;
321 if ((*f))
322 (*f)->state = F_QUEUED;
323 DBG(3, "Stream interrupted");
324 wake_up(&cam->wait_stream);
325 }
326
327 if (cam->state & DEV_DISCONNECTED)
328 return;
329
330 if (cam->state & DEV_MISCONFIGURED) {
331 wake_up_interruptible(&cam->wait_frame);
332 return;
333 }
334
335 if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
336 goto resubmit_urb;
337
338 if (!(*f))
339 (*f) = list_entry(cam->inqueue.next, struct zc0301_frame_t,
340 frame);
341
342 imagesize = (cam->sensor.pix_format.width *
343 cam->sensor.pix_format.height *
344 cam->sensor.pix_format.priv) / 8;
345
346 for (i = 0; i < urb->number_of_packets; i++) {
347 unsigned int len, status;
348 void *pos;
349 u16* soi;
350 u8 sof;
351
352 len = urb->iso_frame_desc[i].actual_length;
353 status = urb->iso_frame_desc[i].status;
354 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
355
356 if (status) {
357 DBG(3, "Error in isochronous frame");
358 (*f)->state = F_ERROR;
359 continue;
360 }
361
362 sof = (*(soi = pos) == 0xd8ff);
363
364 PDBGG("Isochrnous frame: length %u, #%u i,", len, i);
365
366 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
367 start_of_frame:
368 if (sof) {
369 (*f)->state = F_GRABBING;
370 (*f)->buf.bytesused = 0;
371 do_gettimeofday(&(*f)->buf.timestamp);
372 DBG(3, "SOF detected: new video frame");
373 }
374
375 if ((*f)->state == F_GRABBING) {
376 if (sof && (*f)->buf.bytesused)
377 goto end_of_frame;
378
379 if ((*f)->buf.bytesused + len > imagesize) {
380 DBG(3, "Video frame size exceeded");
381 (*f)->state = F_ERROR;
382 continue;
383 }
384
385 memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, len);
386 (*f)->buf.bytesused += len;
387
388 if ((*f)->buf.bytesused == imagesize) {
389 u32 b;
390 end_of_frame:
391 b = (*f)->buf.bytesused;
392 (*f)->state = F_DONE;
393 (*f)->buf.sequence= ++cam->frame_count;
394 spin_lock(&cam->queue_lock);
395 list_move_tail(&(*f)->frame, &cam->outqueue);
396 if (!list_empty(&cam->inqueue))
397 (*f) = list_entry(cam->inqueue.next,
398 struct zc0301_frame_t,
399 frame);
400 else
401 (*f) = NULL;
402 spin_unlock(&cam->queue_lock);
403 DBG(3, "Video frame captured: : %lu bytes",
404 (unsigned long)(b));
405
406 if (!(*f))
407 goto resubmit_urb;
408
409 if (sof)
410 goto start_of_frame;
411 }
412 }
413 }
414
415 resubmit_urb:
416 urb->dev = cam->usbdev;
417 err = usb_submit_urb(urb, GFP_ATOMIC);
418 if (err < 0 && err != -EPERM) {
419 cam->state |= DEV_MISCONFIGURED;
420 DBG(1, "usb_submit_urb() failed");
421 }
422
423 wake_up_interruptible(&cam->wait_frame);
424 }
425
426
427 static int zc0301_start_transfer(struct zc0301_device* cam)
428 {
429 struct usb_device *udev = cam->usbdev;
430 struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
431 usb_ifnum_to_if(udev, 0),
432 ZC0301_ALTERNATE_SETTING);
433 const unsigned int psz = le16_to_cpu(altsetting->
434 endpoint[0].desc.wMaxPacketSize);
435 struct urb* urb;
436 s8 i, j;
437 int err = 0;
438
439 for (i = 0; i < ZC0301_URBS; i++) {
440 cam->transfer_buffer[i] = kzalloc(ZC0301_ISO_PACKETS * psz,
441 GFP_KERNEL);
442 if (!cam->transfer_buffer[i]) {
443 err = -ENOMEM;
444 DBG(1, "Not enough memory");
445 goto free_buffers;
446 }
447 }
448
449 for (i = 0; i < ZC0301_URBS; i++) {
450 urb = usb_alloc_urb(ZC0301_ISO_PACKETS, GFP_KERNEL);
451 cam->urb[i] = urb;
452 if (!urb) {
453 err = -ENOMEM;
454 DBG(1, "usb_alloc_urb() failed");
455 goto free_urbs;
456 }
457 urb->dev = udev;
458 urb->context = cam;
459 urb->pipe = usb_rcvisocpipe(udev, 1);
460 urb->transfer_flags = URB_ISO_ASAP;
461 urb->number_of_packets = ZC0301_ISO_PACKETS;
462 urb->complete = zc0301_urb_complete;
463 urb->transfer_buffer = cam->transfer_buffer[i];
464 urb->transfer_buffer_length = psz * ZC0301_ISO_PACKETS;
465 urb->interval = 1;
466 for (j = 0; j < ZC0301_ISO_PACKETS; j++) {
467 urb->iso_frame_desc[j].offset = psz * j;
468 urb->iso_frame_desc[j].length = psz;
469 }
470 }
471
472 err = usb_set_interface(udev, 0, ZC0301_ALTERNATE_SETTING);
473 if (err) {
474 DBG(1, "usb_set_interface() failed");
475 goto free_urbs;
476 }
477
478 cam->frame_current = NULL;
479
480 for (i = 0; i < ZC0301_URBS; i++) {
481 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
482 if (err) {
483 for (j = i-1; j >= 0; j--)
484 usb_kill_urb(cam->urb[j]);
485 DBG(1, "usb_submit_urb() failed, error %d", err);
486 goto free_urbs;
487 }
488 }
489
490 return 0;
491
492 free_urbs:
493 for (i = 0; (i < ZC0301_URBS) && cam->urb[i]; i++)
494 usb_free_urb(cam->urb[i]);
495
496 free_buffers:
497 for (i = 0; (i < ZC0301_URBS) && cam->transfer_buffer[i]; i++)
498 kfree(cam->transfer_buffer[i]);
499
500 return err;
501 }
502
503
504 static int zc0301_stop_transfer(struct zc0301_device* cam)
505 {
506 struct usb_device *udev = cam->usbdev;
507 s8 i;
508 int err = 0;
509
510 if (cam->state & DEV_DISCONNECTED)
511 return 0;
512
513 for (i = ZC0301_URBS-1; i >= 0; i--) {
514 usb_kill_urb(cam->urb[i]);
515 usb_free_urb(cam->urb[i]);
516 kfree(cam->transfer_buffer[i]);
517 }
518
519 err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
520 if (err)
521 DBG(3, "usb_set_interface() failed");
522
523 return err;
524 }
525
526
527 static int zc0301_stream_interrupt(struct zc0301_device* cam)
528 {
529 long timeout;
530
531 cam->stream = STREAM_INTERRUPT;
532 timeout = wait_event_timeout(cam->wait_stream,
533 (cam->stream == STREAM_OFF) ||
534 (cam->state & DEV_DISCONNECTED),
535 ZC0301_URB_TIMEOUT);
536 if (cam->state & DEV_DISCONNECTED)
537 return -ENODEV;
538 else if (cam->stream != STREAM_OFF) {
539 cam->state |= DEV_MISCONFIGURED;
540 DBG(1, "URB timeout reached. The camera is misconfigured. To "
541 "use it, close and open /dev/video%d again.",
542 cam->v4ldev->minor);
543 return -EIO;
544 }
545
546 return 0;
547 }
548
549 /*****************************************************************************/
550
551 static int
552 zc0301_set_compression(struct zc0301_device* cam,
553 struct v4l2_jpegcompression* compression)
554 {
555 int r, err = 0;
556
557 if ((r = zc0301_read_reg(cam, 0x0008)) < 0)
558 err += r;
559 err += zc0301_write_reg(cam, 0x0008, r | 0x11 | compression->quality);
560
561 return err ? -EIO : 0;
562 }
563
564
565 static int zc0301_init(struct zc0301_device* cam)
566 {
567 struct zc0301_sensor* s = &cam->sensor;
568 struct v4l2_control ctrl;
569 struct v4l2_queryctrl *qctrl;
570 struct v4l2_rect* rect;
571 u8 i = 0;
572 int err = 0;
573
574 if (!(cam->state & DEV_INITIALIZED)) {
575 mutex_init(&cam->open_mutex);
576 init_waitqueue_head(&cam->wait_open);
577 qctrl = s->qctrl;
578 rect = &(s->cropcap.defrect);
579 cam->compression.quality = ZC0301_COMPRESSION_QUALITY;
580 } else { /* use current values */
581 qctrl = s->_qctrl;
582 rect = &(s->_rect);
583 }
584
585 if (s->init) {
586 err = s->init(cam);
587 if (err) {
588 DBG(3, "Sensor initialization failed");
589 return err;
590 }
591 }
592
593 if ((err = zc0301_set_compression(cam, &cam->compression))) {
594 DBG(3, "set_compression() failed");
595 return err;
596 }
597
598 if (s->set_crop)
599 if ((err = s->set_crop(cam, rect))) {
600 DBG(3, "set_crop() failed");
601 return err;
602 }
603
604 if (s->set_ctrl) {
605 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
606 if (s->qctrl[i].id != 0 &&
607 !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
608 ctrl.id = s->qctrl[i].id;
609 ctrl.value = qctrl[i].default_value;
610 err = s->set_ctrl(cam, &ctrl);
611 if (err) {
612 DBG(3, "Set %s control failed",
613 s->qctrl[i].name);
614 return err;
615 }
616 DBG(3, "Image sensor supports '%s' control",
617 s->qctrl[i].name);
618 }
619 }
620
621 if (!(cam->state & DEV_INITIALIZED)) {
622 mutex_init(&cam->fileop_mutex);
623 spin_lock_init(&cam->queue_lock);
624 init_waitqueue_head(&cam->wait_frame);
625 init_waitqueue_head(&cam->wait_stream);
626 cam->nreadbuffers = 2;
627 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
628 memcpy(&(s->_rect), &(s->cropcap.defrect),
629 sizeof(struct v4l2_rect));
630 cam->state |= DEV_INITIALIZED;
631 }
632
633 DBG(2, "Initialization succeeded");
634 return 0;
635 }
636
637 /*****************************************************************************/
638
639 static void zc0301_release_resources(struct kref *kref)
640 {
641 struct zc0301_device *cam = container_of(kref, struct zc0301_device,
642 kref);
643 DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
644 video_set_drvdata(cam->v4ldev, NULL);
645 video_unregister_device(cam->v4ldev);
646 usb_put_dev(cam->usbdev);
647 kfree(cam->control_buffer);
648 kfree(cam);
649 }
650
651
652 static int zc0301_open(struct inode* inode, struct file* filp)
653 {
654 struct zc0301_device* cam;
655 int err = 0;
656
657 if (!down_read_trylock(&zc0301_dev_lock))
658 return -EAGAIN;
659
660 cam = video_get_drvdata(video_devdata(filp));
661
662 if (wait_for_completion_interruptible(&cam->probe)) {
663 up_read(&zc0301_dev_lock);
664 return -ERESTARTSYS;
665 }
666
667 kref_get(&cam->kref);
668
669 if (mutex_lock_interruptible(&cam->open_mutex)) {
670 kref_put(&cam->kref, zc0301_release_resources);
671 up_read(&zc0301_dev_lock);
672 return -ERESTARTSYS;
673 }
674
675 if (cam->state & DEV_DISCONNECTED) {
676 DBG(1, "Device not present");
677 err = -ENODEV;
678 goto out;
679 }
680
681 if (cam->users) {
682 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
683 DBG(3, "Simultaneous opens are not supported");
684 if ((filp->f_flags & O_NONBLOCK) ||
685 (filp->f_flags & O_NDELAY)) {
686 err = -EWOULDBLOCK;
687 goto out;
688 }
689 DBG(2, "A blocking open() has been requested. Wait for the "
690 "device to be released...");
691 up_read(&zc0301_dev_lock);
692 err = wait_event_interruptible_exclusive(cam->wait_open,
693 (cam->state & DEV_DISCONNECTED)
694 || !cam->users);
695 down_read(&zc0301_dev_lock);
696 if (err)
697 goto out;
698 if (cam->state & DEV_DISCONNECTED) {
699 err = -ENODEV;
700 goto out;
701 }
702 }
703
704 if (cam->state & DEV_MISCONFIGURED) {
705 err = zc0301_init(cam);
706 if (err) {
707 DBG(1, "Initialization failed again. "
708 "I will retry on next open().");
709 goto out;
710 }
711 cam->state &= ~DEV_MISCONFIGURED;
712 }
713
714 if ((err = zc0301_start_transfer(cam)))
715 goto out;
716
717 filp->private_data = cam;
718 cam->users++;
719 cam->io = IO_NONE;
720 cam->stream = STREAM_OFF;
721 cam->nbuffers = 0;
722 cam->frame_count = 0;
723 zc0301_empty_framequeues(cam);
724
725 DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
726
727 out:
728 mutex_unlock(&cam->open_mutex);
729 if (err)
730 kref_put(&cam->kref, zc0301_release_resources);
731 up_read(&zc0301_dev_lock);
732 return err;
733 }
734
735
736 static int zc0301_release(struct inode* inode, struct file* filp)
737 {
738 struct zc0301_device* cam;
739
740 down_write(&zc0301_dev_lock);
741
742 cam = video_get_drvdata(video_devdata(filp));
743
744 zc0301_stop_transfer(cam);
745 zc0301_release_buffers(cam);
746 cam->users--;
747 wake_up_interruptible_nr(&cam->wait_open, 1);
748
749 DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
750
751 kref_put(&cam->kref, zc0301_release_resources);
752
753 up_write(&zc0301_dev_lock);
754
755 return 0;
756 }
757
758
759 static ssize_t
760 zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
761 {
762 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
763 struct zc0301_frame_t* f, * i;
764 unsigned long lock_flags;
765 long timeout;
766 int err = 0;
767
768 if (mutex_lock_interruptible(&cam->fileop_mutex))
769 return -ERESTARTSYS;
770
771 if (cam->state & DEV_DISCONNECTED) {
772 DBG(1, "Device not present");
773 mutex_unlock(&cam->fileop_mutex);
774 return -ENODEV;
775 }
776
777 if (cam->state & DEV_MISCONFIGURED) {
778 DBG(1, "The camera is misconfigured. Close and open it "
779 "again.");
780 mutex_unlock(&cam->fileop_mutex);
781 return -EIO;
782 }
783
784 if (cam->io == IO_MMAP) {
785 DBG(3, "Close and open the device again to choose the read "
786 "method");
787 mutex_unlock(&cam->fileop_mutex);
788 return -EBUSY;
789 }
790
791 if (cam->io == IO_NONE) {
792 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
793 DBG(1, "read() failed, not enough memory");
794 mutex_unlock(&cam->fileop_mutex);
795 return -ENOMEM;
796 }
797 cam->io = IO_READ;
798 cam->stream = STREAM_ON;
799 }
800
801 if (list_empty(&cam->inqueue)) {
802 if (!list_empty(&cam->outqueue))
803 zc0301_empty_framequeues(cam);
804 zc0301_queue_unusedframes(cam);
805 }
806
807 if (!count) {
808 mutex_unlock(&cam->fileop_mutex);
809 return 0;
810 }
811
812 if (list_empty(&cam->outqueue)) {
813 if (filp->f_flags & O_NONBLOCK) {
814 mutex_unlock(&cam->fileop_mutex);
815 return -EAGAIN;
816 }
817 timeout = wait_event_interruptible_timeout
818 ( cam->wait_frame,
819 (!list_empty(&cam->outqueue)) ||
820 (cam->state & DEV_DISCONNECTED) ||
821 (cam->state & DEV_MISCONFIGURED),
822 cam->module_param.frame_timeout *
823 1000 * msecs_to_jiffies(1) );
824 if (timeout < 0) {
825 mutex_unlock(&cam->fileop_mutex);
826 return timeout;
827 }
828 if (cam->state & DEV_DISCONNECTED) {
829 mutex_unlock(&cam->fileop_mutex);
830 return -ENODEV;
831 }
832 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
833 mutex_unlock(&cam->fileop_mutex);
834 return -EIO;
835 }
836 }
837
838 f = list_entry(cam->outqueue.prev, struct zc0301_frame_t, frame);
839
840 if (count > f->buf.bytesused)
841 count = f->buf.bytesused;
842
843 if (copy_to_user(buf, f->bufmem, count)) {
844 err = -EFAULT;
845 goto exit;
846 }
847 *f_pos += count;
848
849 exit:
850 spin_lock_irqsave(&cam->queue_lock, lock_flags);
851 list_for_each_entry(i, &cam->outqueue, frame)
852 i->state = F_UNUSED;
853 INIT_LIST_HEAD(&cam->outqueue);
854 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
855
856 zc0301_queue_unusedframes(cam);
857
858 PDBGG("Frame #%lu, bytes read: %zu",
859 (unsigned long)f->buf.index, count);
860
861 mutex_unlock(&cam->fileop_mutex);
862
863 return err ? err : count;
864 }
865
866
867 static unsigned int zc0301_poll(struct file *filp, poll_table *wait)
868 {
869 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
870 struct zc0301_frame_t* f;
871 unsigned long lock_flags;
872 unsigned int mask = 0;
873
874 if (mutex_lock_interruptible(&cam->fileop_mutex))
875 return POLLERR;
876
877 if (cam->state & DEV_DISCONNECTED) {
878 DBG(1, "Device not present");
879 goto error;
880 }
881
882 if (cam->state & DEV_MISCONFIGURED) {
883 DBG(1, "The camera is misconfigured. Close and open it "
884 "again.");
885 goto error;
886 }
887
888 if (cam->io == IO_NONE) {
889 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
890 DBG(1, "poll() failed, not enough memory");
891 goto error;
892 }
893 cam->io = IO_READ;
894 cam->stream = STREAM_ON;
895 }
896
897 if (cam->io == IO_READ) {
898 spin_lock_irqsave(&cam->queue_lock, lock_flags);
899 list_for_each_entry(f, &cam->outqueue, frame)
900 f->state = F_UNUSED;
901 INIT_LIST_HEAD(&cam->outqueue);
902 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
903 zc0301_queue_unusedframes(cam);
904 }
905
906 poll_wait(filp, &cam->wait_frame, wait);
907
908 if (!list_empty(&cam->outqueue))
909 mask |= POLLIN | POLLRDNORM;
910
911 mutex_unlock(&cam->fileop_mutex);
912
913 return mask;
914
915 error:
916 mutex_unlock(&cam->fileop_mutex);
917 return POLLERR;
918 }
919
920
921 static void zc0301_vm_open(struct vm_area_struct* vma)
922 {
923 struct zc0301_frame_t* f = vma->vm_private_data;
924 f->vma_use_count++;
925 }
926
927
928 static void zc0301_vm_close(struct vm_area_struct* vma)
929 {
930 /* NOTE: buffers are not freed here */
931 struct zc0301_frame_t* f = vma->vm_private_data;
932 f->vma_use_count--;
933 }
934
935
936 static struct vm_operations_struct zc0301_vm_ops = {
937 .open = zc0301_vm_open,
938 .close = zc0301_vm_close,
939 };
940
941
942 static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
943 {
944 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
945 unsigned long size = vma->vm_end - vma->vm_start,
946 start = vma->vm_start;
947 void *pos;
948 u32 i;
949
950 if (mutex_lock_interruptible(&cam->fileop_mutex))
951 return -ERESTARTSYS;
952
953 if (cam->state & DEV_DISCONNECTED) {
954 DBG(1, "Device not present");
955 mutex_unlock(&cam->fileop_mutex);
956 return -ENODEV;
957 }
958
959 if (cam->state & DEV_MISCONFIGURED) {
960 DBG(1, "The camera is misconfigured. Close and open it "
961 "again.");
962 mutex_unlock(&cam->fileop_mutex);
963 return -EIO;
964 }
965
966 if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
967 mutex_unlock(&cam->fileop_mutex);
968 return -EACCES;
969 }
970
971 if (cam->io != IO_MMAP ||
972 size != PAGE_ALIGN(cam->frame[0].buf.length)) {
973 mutex_unlock(&cam->fileop_mutex);
974 return -EINVAL;
975 }
976
977 for (i = 0; i < cam->nbuffers; i++) {
978 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
979 break;
980 }
981 if (i == cam->nbuffers) {
982 mutex_unlock(&cam->fileop_mutex);
983 return -EINVAL;
984 }
985
986 vma->vm_flags |= VM_IO;
987 vma->vm_flags |= VM_RESERVED;
988
989 pos = cam->frame[i].bufmem;
990 while (size > 0) { /* size is page-aligned */
991 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
992 mutex_unlock(&cam->fileop_mutex);
993 return -EAGAIN;
994 }
995 start += PAGE_SIZE;
996 pos += PAGE_SIZE;
997 size -= PAGE_SIZE;
998 }
999
1000 vma->vm_ops = &zc0301_vm_ops;
1001 vma->vm_private_data = &cam->frame[i];
1002 zc0301_vm_open(vma);
1003
1004 mutex_unlock(&cam->fileop_mutex);
1005
1006 return 0;
1007 }
1008
1009 /*****************************************************************************/
1010
1011 static int
1012 zc0301_vidioc_querycap(struct zc0301_device* cam, void __user * arg)
1013 {
1014 struct v4l2_capability cap = {
1015 .driver = "zc0301",
1016 .version = ZC0301_MODULE_VERSION_CODE,
1017 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1018 V4L2_CAP_STREAMING,
1019 };
1020
1021 strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1022 if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1023 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1024 sizeof(cap.bus_info));
1025
1026 if (copy_to_user(arg, &cap, sizeof(cap)))
1027 return -EFAULT;
1028
1029 return 0;
1030 }
1031
1032
1033 static int
1034 zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
1035 {
1036 struct v4l2_input i;
1037
1038 if (copy_from_user(&i, arg, sizeof(i)))
1039 return -EFAULT;
1040
1041 if (i.index)
1042 return -EINVAL;
1043
1044 memset(&i, 0, sizeof(i));
1045 strcpy(i.name, "Camera");
1046 i.type = V4L2_INPUT_TYPE_CAMERA;
1047
1048 if (copy_to_user(arg, &i, sizeof(i)))
1049 return -EFAULT;
1050
1051 return 0;
1052 }
1053
1054
1055 static int
1056 zc0301_vidioc_g_input(struct zc0301_device* cam, void __user * arg)
1057 {
1058 int index = 0;
1059
1060 if (copy_to_user(arg, &index, sizeof(index)))
1061 return -EFAULT;
1062
1063 return 0;
1064 }
1065
1066
1067 static int
1068 zc0301_vidioc_s_input(struct zc0301_device* cam, void __user * arg)
1069 {
1070 int index;
1071
1072 if (copy_from_user(&index, arg, sizeof(index)))
1073 return -EFAULT;
1074
1075 if (index != 0)
1076 return -EINVAL;
1077
1078 return 0;
1079 }
1080
1081
1082 static int
1083 zc0301_vidioc_query_ctrl(struct zc0301_device* cam, void __user * arg)
1084 {
1085 struct zc0301_sensor* s = &cam->sensor;
1086 struct v4l2_queryctrl qc;
1087 u8 i;
1088
1089 if (copy_from_user(&qc, arg, sizeof(qc)))
1090 return -EFAULT;
1091
1092 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1093 if (qc.id && qc.id == s->qctrl[i].id) {
1094 memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1095 if (copy_to_user(arg, &qc, sizeof(qc)))
1096 return -EFAULT;
1097 return 0;
1098 }
1099
1100 return -EINVAL;
1101 }
1102
1103
1104 static int
1105 zc0301_vidioc_g_ctrl(struct zc0301_device* cam, void __user * arg)
1106 {
1107 struct zc0301_sensor* s = &cam->sensor;
1108 struct v4l2_control ctrl;
1109 int err = 0;
1110 u8 i;
1111
1112 if (!s->get_ctrl && !s->set_ctrl)
1113 return -EINVAL;
1114
1115 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1116 return -EFAULT;
1117
1118 if (!s->get_ctrl) {
1119 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1120 if (ctrl.id == s->qctrl[i].id) {
1121 ctrl.value = s->_qctrl[i].default_value;
1122 goto exit;
1123 }
1124 return -EINVAL;
1125 } else
1126 err = s->get_ctrl(cam, &ctrl);
1127
1128 exit:
1129 if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1130 return -EFAULT;
1131
1132 return err;
1133 }
1134
1135
1136 static int
1137 zc0301_vidioc_s_ctrl(struct zc0301_device* cam, void __user * arg)
1138 {
1139 struct zc0301_sensor* s = &cam->sensor;
1140 struct v4l2_control ctrl;
1141 u8 i;
1142 int err = 0;
1143
1144 if (!s->set_ctrl)
1145 return -EINVAL;
1146
1147 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1148 return -EFAULT;
1149
1150 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1151 if (ctrl.id == s->qctrl[i].id) {
1152 if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1153 return -EINVAL;
1154 if (ctrl.value < s->qctrl[i].minimum ||
1155 ctrl.value > s->qctrl[i].maximum)
1156 return -ERANGE;
1157 ctrl.value -= ctrl.value % s->qctrl[i].step;
1158 break;
1159 }
1160
1161 if ((err = s->set_ctrl(cam, &ctrl)))
1162 return err;
1163
1164 s->_qctrl[i].default_value = ctrl.value;
1165
1166 return 0;
1167 }
1168
1169
1170 static int
1171 zc0301_vidioc_cropcap(struct zc0301_device* cam, void __user * arg)
1172 {
1173 struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1174
1175 cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1176 cc->pixelaspect.numerator = 1;
1177 cc->pixelaspect.denominator = 1;
1178
1179 if (copy_to_user(arg, cc, sizeof(*cc)))
1180 return -EFAULT;
1181
1182 return 0;
1183 }
1184
1185
1186 static int
1187 zc0301_vidioc_g_crop(struct zc0301_device* cam, void __user * arg)
1188 {
1189 struct zc0301_sensor* s = &cam->sensor;
1190 struct v4l2_crop crop = {
1191 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1192 };
1193
1194 memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1195
1196 if (copy_to_user(arg, &crop, sizeof(crop)))
1197 return -EFAULT;
1198
1199 return 0;
1200 }
1201
1202
1203 static int
1204 zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg)
1205 {
1206 struct zc0301_sensor* s = &cam->sensor;
1207 struct v4l2_crop crop;
1208 struct v4l2_rect* rect;
1209 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1210 const enum zc0301_stream_state stream = cam->stream;
1211 const u32 nbuffers = cam->nbuffers;
1212 u32 i;
1213 int err = 0;
1214
1215 if (copy_from_user(&crop, arg, sizeof(crop)))
1216 return -EFAULT;
1217
1218 rect = &(crop.c);
1219
1220 if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1221 return -EINVAL;
1222
1223 if (cam->module_param.force_munmap)
1224 for (i = 0; i < cam->nbuffers; i++)
1225 if (cam->frame[i].vma_use_count) {
1226 DBG(3, "VIDIOC_S_CROP failed. "
1227 "Unmap the buffers first.");
1228 return -EBUSY;
1229 }
1230
1231 if (!s->set_crop) {
1232 memcpy(rect, &(s->_rect), sizeof(*rect));
1233 if (copy_to_user(arg, &crop, sizeof(crop)))
1234 return -EFAULT;
1235 return 0;
1236 }
1237
1238 rect->left &= ~7L;
1239 rect->top &= ~7L;
1240 if (rect->width < 8)
1241 rect->width = 8;
1242 if (rect->height < 8)
1243 rect->height = 8;
1244 if (rect->width > bounds->width)
1245 rect->width = bounds->width;
1246 if (rect->height > bounds->height)
1247 rect->height = bounds->height;
1248 if (rect->left < bounds->left)
1249 rect->left = bounds->left;
1250 if (rect->top < bounds->top)
1251 rect->top = bounds->top;
1252 if (rect->left + rect->width > bounds->left + bounds->width)
1253 rect->left = bounds->left+bounds->width - rect->width;
1254 if (rect->top + rect->height > bounds->top + bounds->height)
1255 rect->top = bounds->top+bounds->height - rect->height;
1256 rect->width &= ~7L;
1257 rect->height &= ~7L;
1258
1259 if (cam->stream == STREAM_ON)
1260 if ((err = zc0301_stream_interrupt(cam)))
1261 return err;
1262
1263 if (copy_to_user(arg, &crop, sizeof(crop))) {
1264 cam->stream = stream;
1265 return -EFAULT;
1266 }
1267
1268 if (cam->module_param.force_munmap || cam->io == IO_READ)
1269 zc0301_release_buffers(cam);
1270
1271 if (s->set_crop)
1272 err += s->set_crop(cam, rect);
1273
1274 if (err) { /* atomic, no rollback in ioctl() */
1275 cam->state |= DEV_MISCONFIGURED;
1276 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1277 "use the camera, close and open /dev/video%d again.",
1278 cam->v4ldev->minor);
1279 return -EIO;
1280 }
1281
1282 s->pix_format.width = rect->width;
1283 s->pix_format.height = rect->height;
1284 memcpy(&(s->_rect), rect, sizeof(*rect));
1285
1286 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1287 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1288 cam->state |= DEV_MISCONFIGURED;
1289 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1290 "use the camera, close and open /dev/video%d again.",
1291 cam->v4ldev->minor);
1292 return -ENOMEM;
1293 }
1294
1295 if (cam->io == IO_READ)
1296 zc0301_empty_framequeues(cam);
1297 else if (cam->module_param.force_munmap)
1298 zc0301_requeue_outqueue(cam);
1299
1300 cam->stream = stream;
1301
1302 return 0;
1303 }
1304
1305
1306 static int
1307 zc0301_vidioc_enum_framesizes(struct zc0301_device* cam, void __user * arg)
1308 {
1309 struct v4l2_frmsizeenum frmsize;
1310
1311 if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
1312 return -EFAULT;
1313
1314 if (frmsize.index != 0 && frmsize.index != 1)
1315 return -EINVAL;
1316
1317 if (frmsize.pixel_format != V4L2_PIX_FMT_JPEG)
1318 return -EINVAL;
1319
1320 frmsize.type = V4L2_FRMSIZE_TYPE_DISCRETE;
1321
1322 if (frmsize.index == 1) {
1323 frmsize.discrete.width = cam->sensor.cropcap.defrect.width;
1324 frmsize.discrete.height = cam->sensor.cropcap.defrect.height;
1325 }
1326 memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
1327
1328 if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
1329 return -EFAULT;
1330
1331 return 0;
1332 }
1333
1334
1335 static int
1336 zc0301_vidioc_enum_fmt(struct zc0301_device* cam, void __user * arg)
1337 {
1338 struct v4l2_fmtdesc fmtd;
1339
1340 if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1341 return -EFAULT;
1342
1343 if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1344 return -EINVAL;
1345
1346 if (fmtd.index == 0) {
1347 strcpy(fmtd.description, "JPEG");
1348 fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
1349 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1350 } else
1351 return -EINVAL;
1352
1353 fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1354 memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1355
1356 if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1357 return -EFAULT;
1358
1359 return 0;
1360 }
1361
1362
1363 static int
1364 zc0301_vidioc_g_fmt(struct zc0301_device* cam, void __user * arg)
1365 {
1366 struct v4l2_format format;
1367 struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1368
1369 if (copy_from_user(&format, arg, sizeof(format)))
1370 return -EFAULT;
1371
1372 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1373 return -EINVAL;
1374
1375 pfmt->bytesperline = 0;
1376 pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1377 pfmt->field = V4L2_FIELD_NONE;
1378 memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1379
1380 if (copy_to_user(arg, &format, sizeof(format)))
1381 return -EFAULT;
1382
1383 return 0;
1384 }
1385
1386
1387 static int
1388 zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd,
1389 void __user * arg)
1390 {
1391 struct zc0301_sensor* s = &cam->sensor;
1392 struct v4l2_format format;
1393 struct v4l2_pix_format* pix;
1394 struct v4l2_pix_format* pfmt = &(s->pix_format);
1395 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1396 struct v4l2_rect rect;
1397 const enum zc0301_stream_state stream = cam->stream;
1398 const u32 nbuffers = cam->nbuffers;
1399 u32 i;
1400 int err = 0;
1401
1402 if (copy_from_user(&format, arg, sizeof(format)))
1403 return -EFAULT;
1404
1405 pix = &(format.fmt.pix);
1406
1407 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1408 return -EINVAL;
1409
1410 memcpy(&rect, &(s->_rect), sizeof(rect));
1411
1412 if (!s->set_crop) {
1413 pix->width = rect.width;
1414 pix->height = rect.height;
1415 } else {
1416 rect.width = pix->width;
1417 rect.height = pix->height;
1418 }
1419
1420 if (rect.width < 8)
1421 rect.width = 8;
1422 if (rect.height < 8)
1423 rect.height = 8;
1424 if (rect.width > bounds->left + bounds->width - rect.left)
1425 rect.width = bounds->left + bounds->width - rect.left;
1426 if (rect.height > bounds->top + bounds->height - rect.top)
1427 rect.height = bounds->top + bounds->height - rect.top;
1428 rect.width &= ~7L;
1429 rect.height &= ~7L;
1430
1431 pix->width = rect.width;
1432 pix->height = rect.height;
1433 pix->pixelformat = pfmt->pixelformat;
1434 pix->priv = pfmt->priv;
1435 pix->colorspace = pfmt->colorspace;
1436 pix->bytesperline = 0;
1437 pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1438 pix->field = V4L2_FIELD_NONE;
1439
1440 if (cmd == VIDIOC_TRY_FMT) {
1441 if (copy_to_user(arg, &format, sizeof(format)))
1442 return -EFAULT;
1443 return 0;
1444 }
1445
1446 if (cam->module_param.force_munmap)
1447 for (i = 0; i < cam->nbuffers; i++)
1448 if (cam->frame[i].vma_use_count) {
1449 DBG(3, "VIDIOC_S_FMT failed. "
1450 "Unmap the buffers first.");
1451 return -EBUSY;
1452 }
1453
1454 if (cam->stream == STREAM_ON)
1455 if ((err = zc0301_stream_interrupt(cam)))
1456 return err;
1457
1458 if (copy_to_user(arg, &format, sizeof(format))) {
1459 cam->stream = stream;
1460 return -EFAULT;
1461 }
1462
1463 if (cam->module_param.force_munmap || cam->io == IO_READ)
1464 zc0301_release_buffers(cam);
1465
1466 if (s->set_crop)
1467 err += s->set_crop(cam, &rect);
1468
1469 if (err) { /* atomic, no rollback in ioctl() */
1470 cam->state |= DEV_MISCONFIGURED;
1471 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1472 "use the camera, close and open /dev/video%d again.",
1473 cam->v4ldev->minor);
1474 return -EIO;
1475 }
1476
1477 memcpy(pfmt, pix, sizeof(*pix));
1478 memcpy(&(s->_rect), &rect, sizeof(rect));
1479
1480 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1481 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1482 cam->state |= DEV_MISCONFIGURED;
1483 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
1484 "use the camera, close and open /dev/video%d again.",
1485 cam->v4ldev->minor);
1486 return -ENOMEM;
1487 }
1488
1489 if (cam->io == IO_READ)
1490 zc0301_empty_framequeues(cam);
1491 else if (cam->module_param.force_munmap)
1492 zc0301_requeue_outqueue(cam);
1493
1494 cam->stream = stream;
1495
1496 return 0;
1497 }
1498
1499
1500 static int
1501 zc0301_vidioc_g_jpegcomp(struct zc0301_device* cam, void __user * arg)
1502 {
1503 if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
1504 return -EFAULT;
1505
1506 return 0;
1507 }
1508
1509
1510 static int
1511 zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg)
1512 {
1513 struct v4l2_jpegcompression jc;
1514 const enum zc0301_stream_state stream = cam->stream;
1515 int err = 0;
1516
1517 if (copy_from_user(&jc, arg, sizeof(jc)))
1518 return -EFAULT;
1519
1520 if (jc.quality != 0)
1521 return -EINVAL;
1522
1523 if (cam->stream == STREAM_ON)
1524 if ((err = zc0301_stream_interrupt(cam)))
1525 return err;
1526
1527 err += zc0301_set_compression(cam, &jc);
1528 if (err) { /* atomic, no rollback in ioctl() */
1529 cam->state |= DEV_MISCONFIGURED;
1530 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
1531 "problems. To use the camera, close and open "
1532 "/dev/video%d again.", cam->v4ldev->minor);
1533 return -EIO;
1534 }
1535
1536 cam->compression.quality = jc.quality;
1537
1538 cam->stream = stream;
1539
1540 return 0;
1541 }
1542
1543
1544 static int
1545 zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg)
1546 {
1547 struct v4l2_requestbuffers rb;
1548 u32 i;
1549 int err;
1550
1551 if (copy_from_user(&rb, arg, sizeof(rb)))
1552 return -EFAULT;
1553
1554 if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1555 rb.memory != V4L2_MEMORY_MMAP)
1556 return -EINVAL;
1557
1558 if (cam->io == IO_READ) {
1559 DBG(3, "Close and open the device again to choose the mmap "
1560 "I/O method");
1561 return -EBUSY;
1562 }
1563
1564 for (i = 0; i < cam->nbuffers; i++)
1565 if (cam->frame[i].vma_use_count) {
1566 DBG(3, "VIDIOC_REQBUFS failed. "
1567 "Previous buffers are still mapped.");
1568 return -EBUSY;
1569 }
1570
1571 if (cam->stream == STREAM_ON)
1572 if ((err = zc0301_stream_interrupt(cam)))
1573 return err;
1574
1575 zc0301_empty_framequeues(cam);
1576
1577 zc0301_release_buffers(cam);
1578 if (rb.count)
1579 rb.count = zc0301_request_buffers(cam, rb.count, IO_MMAP);
1580
1581 if (copy_to_user(arg, &rb, sizeof(rb))) {
1582 zc0301_release_buffers(cam);
1583 cam->io = IO_NONE;
1584 return -EFAULT;
1585 }
1586
1587 cam->io = rb.count ? IO_MMAP : IO_NONE;
1588
1589 return 0;
1590 }
1591
1592
1593 static int
1594 zc0301_vidioc_querybuf(struct zc0301_device* cam, void __user * arg)
1595 {
1596 struct v4l2_buffer b;
1597
1598 if (copy_from_user(&b, arg, sizeof(b)))
1599 return -EFAULT;
1600
1601 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1602 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1603 return -EINVAL;
1604
1605 memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
1606
1607 if (cam->frame[b.index].vma_use_count)
1608 b.flags |= V4L2_BUF_FLAG_MAPPED;
1609
1610 if (cam->frame[b.index].state == F_DONE)
1611 b.flags |= V4L2_BUF_FLAG_DONE;
1612 else if (cam->frame[b.index].state != F_UNUSED)
1613 b.flags |= V4L2_BUF_FLAG_QUEUED;
1614
1615 if (copy_to_user(arg, &b, sizeof(b)))
1616 return -EFAULT;
1617
1618 return 0;
1619 }
1620
1621
1622 static int
1623 zc0301_vidioc_qbuf(struct zc0301_device* cam, void __user * arg)
1624 {
1625 struct v4l2_buffer b;
1626 unsigned long lock_flags;
1627
1628 if (copy_from_user(&b, arg, sizeof(b)))
1629 return -EFAULT;
1630
1631 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1632 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1633 return -EINVAL;
1634
1635 if (cam->frame[b.index].state != F_UNUSED)
1636 return -EINVAL;
1637
1638 cam->frame[b.index].state = F_QUEUED;
1639
1640 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1641 list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
1642 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1643
1644 PDBGG("Frame #%lu queued", (unsigned long)b.index);
1645
1646 return 0;
1647 }
1648
1649
1650 static int
1651 zc0301_vidioc_dqbuf(struct zc0301_device* cam, struct file* filp,
1652 void __user * arg)
1653 {
1654 struct v4l2_buffer b;
1655 struct zc0301_frame_t *f;
1656 unsigned long lock_flags;
1657 long timeout;
1658
1659 if (copy_from_user(&b, arg, sizeof(b)))
1660 return -EFAULT;
1661
1662 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
1663 return -EINVAL;
1664
1665 if (list_empty(&cam->outqueue)) {
1666 if (cam->stream == STREAM_OFF)
1667 return -EINVAL;
1668 if (filp->f_flags & O_NONBLOCK)
1669 return -EAGAIN;
1670 timeout = wait_event_interruptible_timeout
1671 ( cam->wait_frame,
1672 (!list_empty(&cam->outqueue)) ||
1673 (cam->state & DEV_DISCONNECTED) ||
1674 (cam->state & DEV_MISCONFIGURED),
1675 cam->module_param.frame_timeout *
1676 1000 * msecs_to_jiffies(1) );
1677 if (timeout < 0)
1678 return timeout;
1679 if (cam->state & DEV_DISCONNECTED)
1680 return -ENODEV;
1681 if (!timeout || (cam->state & DEV_MISCONFIGURED))
1682 return -EIO;
1683 }
1684
1685 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1686 f = list_entry(cam->outqueue.next, struct zc0301_frame_t, frame);
1687 list_del(cam->outqueue.next);
1688 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1689
1690 f->state = F_UNUSED;
1691
1692 memcpy(&b, &f->buf, sizeof(b));
1693 if (f->vma_use_count)
1694 b.flags |= V4L2_BUF_FLAG_MAPPED;
1695
1696 if (copy_to_user(arg, &b, sizeof(b)))
1697 return -EFAULT;
1698
1699 PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
1700
1701 return 0;
1702 }
1703
1704
1705 static int
1706 zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg)
1707 {
1708 int type;
1709
1710 if (copy_from_user(&type, arg, sizeof(type)))
1711 return -EFAULT;
1712
1713 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1714 return -EINVAL;
1715
1716 cam->stream = STREAM_ON;
1717
1718 DBG(3, "Stream on");
1719
1720 return 0;
1721 }
1722
1723
1724 static int
1725 zc0301_vidioc_streamoff(struct zc0301_device* cam, void __user * arg)
1726 {
1727 int type, err;
1728
1729 if (copy_from_user(&type, arg, sizeof(type)))
1730 return -EFAULT;
1731
1732 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1733 return -EINVAL;
1734
1735 if (cam->stream == STREAM_ON)
1736 if ((err = zc0301_stream_interrupt(cam)))
1737 return err;
1738
1739 zc0301_empty_framequeues(cam);
1740
1741 DBG(3, "Stream off");
1742
1743 return 0;
1744 }
1745
1746
1747 static int
1748 zc0301_vidioc_g_parm(struct zc0301_device* cam, void __user * arg)
1749 {
1750 struct v4l2_streamparm sp;
1751
1752 if (copy_from_user(&sp, arg, sizeof(sp)))
1753 return -EFAULT;
1754
1755 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1756 return -EINVAL;
1757
1758 sp.parm.capture.extendedmode = 0;
1759 sp.parm.capture.readbuffers = cam->nreadbuffers;
1760
1761 if (copy_to_user(arg, &sp, sizeof(sp)))
1762 return -EFAULT;
1763
1764 return 0;
1765 }
1766
1767
1768 static int
1769 zc0301_vidioc_s_parm(struct zc0301_device* cam, void __user * arg)
1770 {
1771 struct v4l2_streamparm sp;
1772
1773 if (copy_from_user(&sp, arg, sizeof(sp)))
1774 return -EFAULT;
1775
1776 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1777 return -EINVAL;
1778
1779 sp.parm.capture.extendedmode = 0;
1780
1781 if (sp.parm.capture.readbuffers == 0)
1782 sp.parm.capture.readbuffers = cam->nreadbuffers;
1783
1784 if (sp.parm.capture.readbuffers > ZC0301_MAX_FRAMES)
1785 sp.parm.capture.readbuffers = ZC0301_MAX_FRAMES;
1786
1787 if (copy_to_user(arg, &sp, sizeof(sp)))
1788 return -EFAULT;
1789
1790 cam->nreadbuffers = sp.parm.capture.readbuffers;
1791
1792 return 0;
1793 }
1794
1795
1796 static int zc0301_ioctl_v4l2(struct inode* inode, struct file* filp,
1797 unsigned int cmd, void __user * arg)
1798 {
1799 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1800
1801 switch (cmd) {
1802
1803 case VIDIOC_QUERYCAP:
1804 return zc0301_vidioc_querycap(cam, arg);
1805
1806 case VIDIOC_ENUMINPUT:
1807 return zc0301_vidioc_enuminput(cam, arg);
1808
1809 case VIDIOC_G_INPUT:
1810 return zc0301_vidioc_g_input(cam, arg);
1811
1812 case VIDIOC_S_INPUT:
1813 return zc0301_vidioc_s_input(cam, arg);
1814
1815 case VIDIOC_QUERYCTRL:
1816 return zc0301_vidioc_query_ctrl(cam, arg);
1817
1818 case VIDIOC_G_CTRL:
1819 return zc0301_vidioc_g_ctrl(cam, arg);
1820
1821 case VIDIOC_S_CTRL:
1822 return zc0301_vidioc_s_ctrl(cam, arg);
1823
1824 case VIDIOC_CROPCAP:
1825 return zc0301_vidioc_cropcap(cam, arg);
1826
1827 case VIDIOC_G_CROP:
1828 return zc0301_vidioc_g_crop(cam, arg);
1829
1830 case VIDIOC_S_CROP:
1831 return zc0301_vidioc_s_crop(cam, arg);
1832
1833 case VIDIOC_ENUM_FMT:
1834 return zc0301_vidioc_enum_fmt(cam, arg);
1835
1836 case VIDIOC_G_FMT:
1837 return zc0301_vidioc_g_fmt(cam, arg);
1838
1839 case VIDIOC_TRY_FMT:
1840 case VIDIOC_S_FMT:
1841 return zc0301_vidioc_try_s_fmt(cam, cmd, arg);
1842
1843 case VIDIOC_ENUM_FRAMESIZES:
1844 return zc0301_vidioc_enum_framesizes(cam, arg);
1845
1846 case VIDIOC_G_JPEGCOMP:
1847 return zc0301_vidioc_g_jpegcomp(cam, arg);
1848
1849 case VIDIOC_S_JPEGCOMP:
1850 return zc0301_vidioc_s_jpegcomp(cam, arg);
1851
1852 case VIDIOC_REQBUFS:
1853 return zc0301_vidioc_reqbufs(cam, arg);
1854
1855 case VIDIOC_QUERYBUF:
1856 return zc0301_vidioc_querybuf(cam, arg);
1857
1858 case VIDIOC_QBUF:
1859 return zc0301_vidioc_qbuf(cam, arg);
1860
1861 case VIDIOC_DQBUF:
1862 return zc0301_vidioc_dqbuf(cam, filp, arg);
1863
1864 case VIDIOC_STREAMON:
1865 return zc0301_vidioc_streamon(cam, arg);
1866
1867 case VIDIOC_STREAMOFF:
1868 return zc0301_vidioc_streamoff(cam, arg);
1869
1870 case VIDIOC_G_PARM:
1871 return zc0301_vidioc_g_parm(cam, arg);
1872
1873 case VIDIOC_S_PARM:
1874 return zc0301_vidioc_s_parm(cam, arg);
1875
1876 case VIDIOC_G_STD:
1877 case VIDIOC_S_STD:
1878 case VIDIOC_QUERYSTD:
1879 case VIDIOC_ENUMSTD:
1880 case VIDIOC_QUERYMENU:
1881 case VIDIOC_ENUM_FRAMEINTERVALS:
1882 return -EINVAL;
1883
1884 default:
1885 return -EINVAL;
1886
1887 }
1888 }
1889
1890
1891 static int zc0301_ioctl(struct inode* inode, struct file* filp,
1892 unsigned int cmd, unsigned long arg)
1893 {
1894 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1895 int err = 0;
1896
1897 if (mutex_lock_interruptible(&cam->fileop_mutex))
1898 return -ERESTARTSYS;
1899
1900 if (cam->state & DEV_DISCONNECTED) {
1901 DBG(1, "Device not present");
1902 mutex_unlock(&cam->fileop_mutex);
1903 return -ENODEV;
1904 }
1905
1906 if (cam->state & DEV_MISCONFIGURED) {
1907 DBG(1, "The camera is misconfigured. Close and open it "
1908 "again.");
1909 mutex_unlock(&cam->fileop_mutex);
1910 return -EIO;
1911 }
1912
1913 V4LDBG(3, "zc0301", cmd);
1914
1915 err = zc0301_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
1916
1917 mutex_unlock(&cam->fileop_mutex);
1918
1919 return err;
1920 }
1921
1922
1923 static const struct file_operations zc0301_fops = {
1924 .owner = THIS_MODULE,
1925 .open = zc0301_open,
1926 .release = zc0301_release,
1927 .ioctl = zc0301_ioctl,
1928 .compat_ioctl = v4l_compat_ioctl32,
1929 .read = zc0301_read,
1930 .poll = zc0301_poll,
1931 .mmap = zc0301_mmap,
1932 .llseek = no_llseek,
1933 };
1934
1935 /*****************************************************************************/
1936
1937 static int
1938 zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
1939 {
1940 struct usb_device *udev = interface_to_usbdev(intf);
1941 struct zc0301_device* cam;
1942 static unsigned int dev_nr = 0;
1943 unsigned int i;
1944 int err = 0;
1945
1946 if (!(cam = kzalloc(sizeof(struct zc0301_device), GFP_KERNEL)))
1947 return -ENOMEM;
1948
1949 cam->usbdev = udev;
1950
1951 if (!(cam->control_buffer = kzalloc(4, GFP_KERNEL))) {
1952 DBG(1, "kmalloc() failed");
1953 err = -ENOMEM;
1954 goto fail;
1955 }
1956
1957 if (!(cam->v4ldev = video_device_alloc())) {
1958 DBG(1, "video_device_alloc() failed");
1959 err = -ENOMEM;
1960 goto fail;
1961 }
1962
1963 DBG(2, "ZC0301[P] Image Processor and Control Chip detected "
1964 "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
1965
1966 for (i = 0; zc0301_sensor_table[i]; i++) {
1967 err = zc0301_sensor_table[i](cam);
1968 if (!err)
1969 break;
1970 }
1971
1972 if (!err)
1973 DBG(2, "%s image sensor detected", cam->sensor.name);
1974 else {
1975 DBG(1, "No supported image sensor detected");
1976 err = -ENODEV;
1977 goto fail;
1978 }
1979
1980 if (zc0301_init(cam)) {
1981 DBG(1, "Initialization failed. I will retry on open().");
1982 cam->state |= DEV_MISCONFIGURED;
1983 }
1984
1985 strcpy(cam->v4ldev->name, "ZC0301[P] PC Camera");
1986 cam->v4ldev->owner = THIS_MODULE;
1987 cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
1988 cam->v4ldev->fops = &zc0301_fops;
1989 cam->v4ldev->minor = video_nr[dev_nr];
1990 cam->v4ldev->release = video_device_release;
1991 video_set_drvdata(cam->v4ldev, cam);
1992
1993 init_completion(&cam->probe);
1994
1995 err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
1996 video_nr[dev_nr]);
1997 if (err) {
1998 DBG(1, "V4L2 device registration failed");
1999 if (err == -ENFILE && video_nr[dev_nr] == -1)
2000 DBG(1, "Free /dev/videoX node not found");
2001 video_nr[dev_nr] = -1;
2002 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
2003 complete_all(&cam->probe);
2004 goto fail;
2005 }
2006
2007 DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2008
2009 cam->module_param.force_munmap = force_munmap[dev_nr];
2010 cam->module_param.frame_timeout = frame_timeout[dev_nr];
2011
2012 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
2013
2014 usb_set_intfdata(intf, cam);
2015 kref_init(&cam->kref);
2016 usb_get_dev(cam->usbdev);
2017
2018 complete_all(&cam->probe);
2019
2020 return 0;
2021
2022 fail:
2023 if (cam) {
2024 kfree(cam->control_buffer);
2025 if (cam->v4ldev)
2026 video_device_release(cam->v4ldev);
2027 kfree(cam);
2028 }
2029 return err;
2030 }
2031
2032
2033 static void zc0301_usb_disconnect(struct usb_interface* intf)
2034 {
2035 struct zc0301_device* cam;
2036
2037 down_write(&zc0301_dev_lock);
2038
2039 cam = usb_get_intfdata(intf);
2040
2041 DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2042
2043 if (cam->users) {
2044 DBG(2, "Device /dev/video%d is open! Deregistration and "
2045 "memory deallocation are deferred.",
2046 cam->v4ldev->minor);
2047 cam->state |= DEV_MISCONFIGURED;
2048 zc0301_stop_transfer(cam);
2049 cam->state |= DEV_DISCONNECTED;
2050 wake_up_interruptible(&cam->wait_frame);
2051 wake_up(&cam->wait_stream);
2052 } else
2053 cam->state |= DEV_DISCONNECTED;
2054
2055 wake_up_interruptible_all(&cam->wait_open);
2056
2057 kref_put(&cam->kref, zc0301_release_resources);
2058
2059 up_write(&zc0301_dev_lock);
2060 }
2061
2062
2063 static struct usb_driver zc0301_usb_driver = {
2064 .name = "zc0301",
2065 .id_table = zc0301_id_table,
2066 .probe = zc0301_usb_probe,
2067 .disconnect = zc0301_usb_disconnect,
2068 };
2069
2070 /*****************************************************************************/
2071
2072 static int __init zc0301_module_init(void)
2073 {
2074 int err = 0;
2075
2076 KDBG(2, ZC0301_MODULE_NAME " v" ZC0301_MODULE_VERSION);
2077 KDBG(3, ZC0301_MODULE_AUTHOR);
2078
2079 if ((err = usb_register(&zc0301_usb_driver)))
2080 KDBG(1, "usb_register() failed");
2081
2082 return err;
2083 }
2084
2085
2086 static void __exit zc0301_module_exit(void)
2087 {
2088 usb_deregister(&zc0301_usb_driver);
2089 }
2090
2091
2092 module_init(zc0301_module_init);
2093 module_exit(zc0301_module_exit);
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