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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-2.6-block.git] / drivers / media / video / zc0301 / zc0301_core.c
CommitLineData
60f78052 1/***************************************************************************
a87cde0b 2 * Video4Linux2 driver for ZC0301[P] Image Processor and Control Chip *
60f78052
LR		 3 * *
4 * Copyright (C) 2006 by Luca Risolia <luca.risolia@studio.unibo.it> *
5 * *
9e47a52b
LR		 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> *
60f78052
LR		 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/moduleparam.h>
30#include <linux/errno.h>
31#include <linux/slab.h>
60f78052
LR		 32#include <linux/device.h>
33#include <linux/fs.h>
34#include <linux/delay.h>
60f78052
LR		 35#include <linux/compiler.h>
36#include <linux/ioctl.h>
37#include <linux/poll.h>
38#include <linux/stat.h>
39#include <linux/mm.h>
40#include <linux/vmalloc.h>
41#include <linux/page-flags.h>
42#include <linux/byteorder/generic.h>
43#include <asm/page.h>
44#include <asm/uaccess.h>
45
46#include "zc0301.h"
47
48/*****************************************************************************/
49
a87cde0b 50#define ZC0301_MODULE_NAME "V4L2 driver for ZC0301[P] " \
d56410e0 51 "Image Processor and Control Chip"
60f78052
LR		 52#define ZC0301_MODULE_AUTHOR "(C) 2006 Luca Risolia"
53#define ZC0301_AUTHOR_EMAIL "<luca.risolia@studio.unibo.it>"
54#define ZC0301_MODULE_LICENSE "GPL"
a87cde0b
LR		 55#define ZC0301_MODULE_VERSION "1:1.05"
56#define ZC0301_MODULE_VERSION_CODE KERNEL_VERSION(1, 0, 5)
60f78052
LR		 57
58/*****************************************************************************/
59
60MODULE_DEVICE_TABLE(usb, zc0301_id_table);
61
62MODULE_AUTHOR(ZC0301_MODULE_AUTHOR " " ZC0301_AUTHOR_EMAIL);
63MODULE_DESCRIPTION(ZC0301_MODULE_NAME);
64MODULE_VERSION(ZC0301_MODULE_VERSION);
65MODULE_LICENSE(ZC0301_MODULE_LICENSE);
66
67static short video_nr[] = {[0 ... ZC0301_MAX_DEVICES-1] = -1};
68module_param_array(video_nr, short, NULL, 0444);
69MODULE_PARM_DESC(video_nr,
d56410e0
MCC		 70 "\n<-1|n[,...]> Specify V4L2 minor mode number."
71 "\n -1 = use next available (default)"
72 "\n n = use minor number n (integer >= 0)"
73 "\nYou can specify up to "
74 __MODULE_STRING(ZC0301_MAX_DEVICES) " cameras this way."
75 "\nFor example:"
76 "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
77 "\nthe second registered camera and use auto for the first"
78 "\none and for every other camera."
79 "\n");
60f78052
LR		 80
81static short force_munmap[] = {[0 ... ZC0301_MAX_DEVICES-1] =
d56410e0 82 ZC0301_FORCE_MUNMAP};
60f78052
LR		 83module_param_array(force_munmap, bool, NULL, 0444);
84MODULE_PARM_DESC(force_munmap,
d56410e0
MCC		 85 "\n<0|1[,...]> Force the application to unmap previously"
86 "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
87 "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
88 "\nthis feature. This parameter is specific for each"
89 "\ndetected camera."
90 "\n 0 = do not force memory unmapping"
91 "\n 1 = force memory unmapping (save memory)"
92 "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
93 "\n");
60f78052 94
a8474239 95static unsigned int frame_timeout[] = {[0 ... ZC0301_MAX_DEVICES-1] =
d56410e0 96 ZC0301_FRAME_TIMEOUT};
a8474239
LR		 97module_param_array(frame_timeout, uint, NULL, 0644);
98MODULE_PARM_DESC(frame_timeout,
d56410e0
MCC		 99 "\n<n[,...]> Timeout for a video frame in seconds."
100 "\nThis parameter is specific for each detected camera."
101 "\nDefault value is "__MODULE_STRING(ZC0301_FRAME_TIMEOUT)"."
102 "\n");
a8474239 103
60f78052
LR		 104#ifdef ZC0301_DEBUG
105static unsigned short debug = ZC0301_DEBUG_LEVEL;
106module_param(debug, ushort, 0644);
107MODULE_PARM_DESC(debug,
d56410e0
MCC		 108 "\n<n> Debugging information level, from 0 to 3:"
109 "\n0 = none (use carefully)"
110 "\n1 = critical errors"
111 "\n2 = significant informations"
112 "\n3 = more verbose messages"
113 "\nLevel 3 is useful for testing only, when only "
114 "one device is used."
115 "\nDefault value is "__MODULE_STRING(ZC0301_DEBUG_LEVEL)"."
116 "\n");
60f78052
LR		 117#endif
118
119/*****************************************************************************/
120
121static u32
122zc0301_request_buffers(struct zc0301_device* cam, u32 count,
d56410e0 123 enum zc0301_io_method io)
60f78052 124{
a8474239
LR		 125 struct v4l2_pix_format* p = &(cam->sensor.pix_format);
126 struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
60f78052 127 const size_t imagesize = cam->module_param.force_munmap ||
d56410e0
MCC		 128 io == IO_READ ?
129 (p->width * p->height * p->priv) / 8 :
130 (r->width * r->height * p->priv) / 8;
60f78052
LR		 131 void* buff = NULL;
132 u32 i;
133
134 if (count > ZC0301_MAX_FRAMES)
135 count = ZC0301_MAX_FRAMES;
136
137 cam->nbuffers = count;
138 while (cam->nbuffers > 0) {
139 if ((buff = vmalloc_32(cam->nbuffers * 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
160static 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
170static 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
184static 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
197static 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
213int 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,
d56410e0 219 value, index, NULL, 0, ZC0301_CTRL_TIMEOUT);
60f78052
LR		 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
230int 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,
d56410e0 237 0x0001, index, buff, 1, ZC0301_CTRL_TIMEOUT);
60f78052
LR		 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
248int 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
280int 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
7d12e780 306static void zc0301_urb_complete(struct urb *urb)
60f78052
LR		 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");
9e47a52b 324 wake_up(&cam->wait_stream);
60f78052
LR		 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,
d56410e0 340 frame);
60f78052 341
a8474239 342 imagesize = (cam->sensor.pix_format.width *
d56410e0
MCC		 343 cam->sensor.pix_format.height *
344 cam->sensor.pix_format.priv) / 8;
60f78052
LR		 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)
367start_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;
390end_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,
d56410e0
MCC		 398 struct zc0301_frame_t,
399 frame);
60f78052
LR		 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
415resubmit_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
427static int zc0301_start_transfer(struct zc0301_device* cam)
428{
429 struct usb_device *udev = cam->usbdev;
a87cde0b
LR		 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 = altsetting->endpoint[0].desc.wMaxPacketSize;
60f78052 434 struct urb* urb;
60f78052
LR		 435 s8 i, j;
436 int err = 0;
437
438 for (i = 0; i < ZC0301_URBS; i++) {
439 cam->transfer_buffer[i] = kzalloc(ZC0301_ISO_PACKETS * psz,
d56410e0 440 GFP_KERNEL);
60f78052
LR		 441 if (!cam->transfer_buffer[i]) {
442 err = -ENOMEM;
443 DBG(1, "Not enough memory");
444 goto free_buffers;
445 }
446 }
447
448 for (i = 0; i < ZC0301_URBS; i++) {
449 urb = usb_alloc_urb(ZC0301_ISO_PACKETS, GFP_KERNEL);
450 cam->urb[i] = urb;
451 if (!urb) {
452 err = -ENOMEM;
453 DBG(1, "usb_alloc_urb() failed");
454 goto free_urbs;
455 }
456 urb->dev = udev;
457 urb->context = cam;
458 urb->pipe = usb_rcvisocpipe(udev, 1);
459 urb->transfer_flags = URB_ISO_ASAP;
460 urb->number_of_packets = ZC0301_ISO_PACKETS;
461 urb->complete = zc0301_urb_complete;
462 urb->transfer_buffer = cam->transfer_buffer[i];
463 urb->transfer_buffer_length = psz * ZC0301_ISO_PACKETS;
464 urb->interval = 1;
465 for (j = 0; j < ZC0301_ISO_PACKETS; j++) {
466 urb->iso_frame_desc[j].offset = psz * j;
467 urb->iso_frame_desc[j].length = psz;
468 }
469 }
470
471 err = usb_set_interface(udev, 0, ZC0301_ALTERNATE_SETTING);
472 if (err) {
473 DBG(1, "usb_set_interface() failed");
474 goto free_urbs;
475 }
476
477 cam->frame_current = NULL;
478
479 for (i = 0; i < ZC0301_URBS; i++) {
480 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
481 if (err) {
482 for (j = i-1; j >= 0; j--)
483 usb_kill_urb(cam->urb[j]);
484 DBG(1, "usb_submit_urb() failed, error %d", err);
485 goto free_urbs;
486 }
487 }
488
489 return 0;
490
491free_urbs:
492 for (i = 0; (i < ZC0301_URBS) && cam->urb[i]; i++)
493 usb_free_urb(cam->urb[i]);
494
495free_buffers:
496 for (i = 0; (i < ZC0301_URBS) && cam->transfer_buffer[i]; i++)
497 kfree(cam->transfer_buffer[i]);
498
499 return err;
500}
501
502
503static int zc0301_stop_transfer(struct zc0301_device* cam)
504{
505 struct usb_device *udev = cam->usbdev;
506 s8 i;
507 int err = 0;
508
509 if (cam->state & DEV_DISCONNECTED)
510 return 0;
511
512 for (i = ZC0301_URBS-1; i >= 0; i--) {
513 usb_kill_urb(cam->urb[i]);
514 usb_free_urb(cam->urb[i]);
515 kfree(cam->transfer_buffer[i]);
516 }
517
518 err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
519 if (err)
520 DBG(3, "usb_set_interface() failed");
521
522 return err;
523}
524
525
526static int zc0301_stream_interrupt(struct zc0301_device* cam)
527{
528 long timeout;
529
530 cam->stream = STREAM_INTERRUPT;
531 timeout = wait_event_timeout(cam->wait_stream,
d56410e0
MCC		 532 (cam->stream == STREAM_OFF) ||
533 (cam->state & DEV_DISCONNECTED),
534 ZC0301_URB_TIMEOUT);
60f78052
LR		 535 if (cam->state & DEV_DISCONNECTED)
536 return -ENODEV;
9e47a52b 537 else if (cam->stream != STREAM_OFF) {
60f78052
LR		 538 cam->state |= DEV_MISCONFIGURED;
539 DBG(1, "URB timeout reached. The camera is misconfigured. To "
540 "use it, close and open /dev/video%d again.",
541 cam->v4ldev->minor);
542 return -EIO;
543 }
544
545 return 0;
546}
547
548/*****************************************************************************/
549
550static int
551zc0301_set_compression(struct zc0301_device* cam,
d56410e0 552 struct v4l2_jpegcompression* compression)
60f78052
LR		 553{
554 int r, err = 0;
555
556 if ((r = zc0301_read_reg(cam, 0x0008)) < 0)
557 err += r;
9e47a52b 558 err += zc0301_write_reg(cam, 0x0008, r | 0x11 | compression->quality);
60f78052
LR		 559
560 return err ? -EIO : 0;
561}
562
563
564static int zc0301_init(struct zc0301_device* cam)
565{
a8474239 566 struct zc0301_sensor* s = &cam->sensor;
60f78052
LR		 567 struct v4l2_control ctrl;
568 struct v4l2_queryctrl *qctrl;
569 struct v4l2_rect* rect;
570 u8 i = 0;
571 int err = 0;
572
573 if (!(cam->state & DEV_INITIALIZED)) {
574 init_waitqueue_head(&cam->open);
575 qctrl = s->qctrl;
576 rect = &(s->cropcap.defrect);
577 cam->compression.quality = ZC0301_COMPRESSION_QUALITY;
578 } else { /* use current values */
579 qctrl = s->_qctrl;
580 rect = &(s->_rect);
581 }
582
583 if (s->init) {
584 err = s->init(cam);
585 if (err) {
586 DBG(3, "Sensor initialization failed");
587 return err;
588 }
589 }
590
591 if ((err = zc0301_set_compression(cam, &cam->compression))) {
592 DBG(3, "set_compression() failed");
593 return err;
594 }
595
596 if (s->set_crop)
597 if ((err = s->set_crop(cam, rect))) {
598 DBG(3, "set_crop() failed");
599 return err;
600 }
601
602 if (s->set_ctrl) {
603 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
604 if (s->qctrl[i].id != 0 &&
605 !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
606 ctrl.id = s->qctrl[i].id;
607 ctrl.value = qctrl[i].default_value;
608 err = s->set_ctrl(cam, &ctrl);
609 if (err) {
610 DBG(3, "Set %s control failed",
611 s->qctrl[i].name);
612 return err;
613 }
614 DBG(3, "Image sensor supports '%s' control",
615 s->qctrl[i].name);
616 }
617 }
618
619 if (!(cam->state & DEV_INITIALIZED)) {
620 mutex_init(&cam->fileop_mutex);
621 spin_lock_init(&cam->queue_lock);
622 init_waitqueue_head(&cam->wait_frame);
623 init_waitqueue_head(&cam->wait_stream);
624 cam->nreadbuffers = 2;
625 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
626 memcpy(&(s->_rect), &(s->cropcap.defrect),
627 sizeof(struct v4l2_rect));
628 cam->state |= DEV_INITIALIZED;
629 }
630
631 DBG(2, "Initialization succeeded");
632 return 0;
633}
634
635
636static void zc0301_release_resources(struct zc0301_device* cam)
637{
638 DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
639 video_set_drvdata(cam->v4ldev, NULL);
640 video_unregister_device(cam->v4ldev);
641 kfree(cam->control_buffer);
642}
643
644/*****************************************************************************/
645
646static int zc0301_open(struct inode* inode, struct file* filp)
647{
648 struct zc0301_device* cam;
649 int err = 0;
650
651 /*
652 This is the only safe way to prevent race conditions with
653 disconnect
654 */
655 if (!down_read_trylock(&zc0301_disconnect))
656 return -ERESTARTSYS;
657
658 cam = video_get_drvdata(video_devdata(filp));
659
660 if (mutex_lock_interruptible(&cam->dev_mutex)) {
661 up_read(&zc0301_disconnect);
662 return -ERESTARTSYS;
663 }
664
665 if (cam->users) {
666 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
667 if ((filp->f_flags & O_NONBLOCK) ||
668 (filp->f_flags & O_NDELAY)) {
669 err = -EWOULDBLOCK;
670 goto out;
671 }
672 mutex_unlock(&cam->dev_mutex);
673 err = wait_event_interruptible_exclusive(cam->open,
d56410e0
MCC		 674 cam->state & DEV_DISCONNECTED
675 || !cam->users);
60f78052
LR		 676 if (err) {
677 up_read(&zc0301_disconnect);
678 return err;
679 }
680 if (cam->state & DEV_DISCONNECTED) {
681 up_read(&zc0301_disconnect);
682 return -ENODEV;
683 }
684 mutex_lock(&cam->dev_mutex);
685 }
686
687
688 if (cam->state & DEV_MISCONFIGURED) {
689 err = zc0301_init(cam);
690 if (err) {
691 DBG(1, "Initialization failed again. "
692 "I will retry on next open().");
693 goto out;
694 }
695 cam->state &= ~DEV_MISCONFIGURED;
696 }
697
698 if ((err = zc0301_start_transfer(cam)))
699 goto out;
700
701 filp->private_data = cam;
702 cam->users++;
703 cam->io = IO_NONE;
704 cam->stream = STREAM_OFF;
705 cam->nbuffers = 0;
706 cam->frame_count = 0;
707 zc0301_empty_framequeues(cam);
708
709 DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
710
711out:
712 mutex_unlock(&cam->dev_mutex);
713 up_read(&zc0301_disconnect);
714 return err;
715}
716
717
718static int zc0301_release(struct inode* inode, struct file* filp)
719{
720 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
721
722 mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
723
724 zc0301_stop_transfer(cam);
725
726 zc0301_release_buffers(cam);
727
728 if (cam->state & DEV_DISCONNECTED) {
729 zc0301_release_resources(cam);
6e0755a4 730 usb_put_dev(cam->usbdev);
60f78052
LR		 731 mutex_unlock(&cam->dev_mutex);
732 kfree(cam);
733 return 0;
734 }
735
736 cam->users--;
737 wake_up_interruptible_nr(&cam->open, 1);
738
739 DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
740
741 mutex_unlock(&cam->dev_mutex);
742
743 return 0;
744}
745
746
747static ssize_t
9e47a52b 748zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
60f78052
LR		 749{
750 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
751 struct zc0301_frame_t* f, * i;
752 unsigned long lock_flags;
753 long timeout;
754 int err = 0;
755
756 if (mutex_lock_interruptible(&cam->fileop_mutex))
757 return -ERESTARTSYS;
758
759 if (cam->state & DEV_DISCONNECTED) {
760 DBG(1, "Device not present");
761 mutex_unlock(&cam->fileop_mutex);
762 return -ENODEV;
763 }
764
765 if (cam->state & DEV_MISCONFIGURED) {
766 DBG(1, "The camera is misconfigured. Close and open it "
767 "again.");
768 mutex_unlock(&cam->fileop_mutex);
769 return -EIO;
770 }
771
772 if (cam->io == IO_MMAP) {
773 DBG(3, "Close and open the device again to choose the read "
774 "method");
775 mutex_unlock(&cam->fileop_mutex);
776 return -EINVAL;
777 }
778
779 if (cam->io == IO_NONE) {
780 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
781 DBG(1, "read() failed, not enough memory");
782 mutex_unlock(&cam->fileop_mutex);
783 return -ENOMEM;
784 }
785 cam->io = IO_READ;
786 cam->stream = STREAM_ON;
787 }
788
789 if (list_empty(&cam->inqueue)) {
790 if (!list_empty(&cam->outqueue))
791 zc0301_empty_framequeues(cam);
792 zc0301_queue_unusedframes(cam);
793 }
794
795 if (!count) {
796 mutex_unlock(&cam->fileop_mutex);
797 return 0;
798 }
799
800 if (list_empty(&cam->outqueue)) {
801 if (filp->f_flags & O_NONBLOCK) {
802 mutex_unlock(&cam->fileop_mutex);
803 return -EAGAIN;
804 }
805 timeout = wait_event_interruptible_timeout
d56410e0
MCC		 806 ( cam->wait_frame,
807 (!list_empty(&cam->outqueue)) ||
808 (cam->state & DEV_DISCONNECTED) ||
809 (cam->state & DEV_MISCONFIGURED),
810 cam->module_param.frame_timeout *
811 1000 * msecs_to_jiffies(1) );
60f78052
LR		 812 if (timeout < 0) {
813 mutex_unlock(&cam->fileop_mutex);
814 return timeout;
815 }
816 if (cam->state & DEV_DISCONNECTED) {
817 mutex_unlock(&cam->fileop_mutex);
818 return -ENODEV;
819 }
820 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
821 mutex_unlock(&cam->fileop_mutex);
822 return -EIO;
823 }
824 }
825
826 f = list_entry(cam->outqueue.prev, struct zc0301_frame_t, frame);
827
828 if (count > f->buf.bytesused)
829 count = f->buf.bytesused;
830
831 if (copy_to_user(buf, f->bufmem, count)) {
832 err = -EFAULT;
833 goto exit;
834 }
835 *f_pos += count;
836
837exit:
838 spin_lock_irqsave(&cam->queue_lock, lock_flags);
839 list_for_each_entry(i, &cam->outqueue, frame)
840 i->state = F_UNUSED;
841 INIT_LIST_HEAD(&cam->outqueue);
842 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
843
844 zc0301_queue_unusedframes(cam);
845
846 PDBGG("Frame #%lu, bytes read: %zu",
847 (unsigned long)f->buf.index, count);
848
849 mutex_unlock(&cam->fileop_mutex);
850
851 return err ? err : count;
852}
853
854
855static unsigned int zc0301_poll(struct file *filp, poll_table *wait)
856{
857 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
858 struct zc0301_frame_t* f;
859 unsigned long lock_flags;
860 unsigned int mask = 0;
861
862 if (mutex_lock_interruptible(&cam->fileop_mutex))
863 return POLLERR;
864
865 if (cam->state & DEV_DISCONNECTED) {
866 DBG(1, "Device not present");
867 goto error;
868 }
869
870 if (cam->state & DEV_MISCONFIGURED) {
871 DBG(1, "The camera is misconfigured. Close and open it "
872 "again.");
873 goto error;
874 }
875
876 if (cam->io == IO_NONE) {
877 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
878 DBG(1, "poll() failed, not enough memory");
879 goto error;
880 }
881 cam->io = IO_READ;
882 cam->stream = STREAM_ON;
883 }
884
885 if (cam->io == IO_READ) {
886 spin_lock_irqsave(&cam->queue_lock, lock_flags);
887 list_for_each_entry(f, &cam->outqueue, frame)
888 f->state = F_UNUSED;
889 INIT_LIST_HEAD(&cam->outqueue);
890 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
891 zc0301_queue_unusedframes(cam);
892 }
893
894 poll_wait(filp, &cam->wait_frame, wait);
895
896 if (!list_empty(&cam->outqueue))
897 mask |= POLLIN | POLLRDNORM;
898
899 mutex_unlock(&cam->fileop_mutex);
900
901 return mask;
902
903error:
904 mutex_unlock(&cam->fileop_mutex);
905 return POLLERR;
906}
907
908
909static void zc0301_vm_open(struct vm_area_struct* vma)
910{
911 struct zc0301_frame_t* f = vma->vm_private_data;
912 f->vma_use_count++;
913}
914
915
916static void zc0301_vm_close(struct vm_area_struct* vma)
917{
918 /* NOTE: buffers are not freed here */
919 struct zc0301_frame_t* f = vma->vm_private_data;
920 f->vma_use_count--;
921}
922
923
924static struct vm_operations_struct zc0301_vm_ops = {
925 .open = zc0301_vm_open,
926 .close = zc0301_vm_close,
927};
928
929
930static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
931{
932 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
933 unsigned long size = vma->vm_end - vma->vm_start,
d56410e0 934 start = vma->vm_start;
60f78052
LR		 935 void *pos;
936 u32 i;
937
938 if (mutex_lock_interruptible(&cam->fileop_mutex))
939 return -ERESTARTSYS;
940
941 if (cam->state & DEV_DISCONNECTED) {
942 DBG(1, "Device not present");
943 mutex_unlock(&cam->fileop_mutex);
944 return -ENODEV;
945 }
946
947 if (cam->state & DEV_MISCONFIGURED) {
948 DBG(1, "The camera is misconfigured. Close and open it "
949 "again.");
950 mutex_unlock(&cam->fileop_mutex);
951 return -EIO;
952 }
953
954 if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
955 size != PAGE_ALIGN(cam->frame[0].buf.length)) {
956 mutex_unlock(&cam->fileop_mutex);
957 return -EINVAL;
958 }
959
960 for (i = 0; i < cam->nbuffers; i++) {
961 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
962 break;
963 }
964 if (i == cam->nbuffers) {
965 mutex_unlock(&cam->fileop_mutex);
966 return -EINVAL;
967 }
968
969 vma->vm_flags |= VM_IO;
970 vma->vm_flags |= VM_RESERVED;
971
972 pos = cam->frame[i].bufmem;
973 while (size > 0) { /* size is page-aligned */
974 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
975 mutex_unlock(&cam->fileop_mutex);
976 return -EAGAIN;
977 }
978 start += PAGE_SIZE;
979 pos += PAGE_SIZE;
980 size -= PAGE_SIZE;
981 }
982
983 vma->vm_ops = &zc0301_vm_ops;
984 vma->vm_private_data = &cam->frame[i];
985
986 zc0301_vm_open(vma);
987
988 mutex_unlock(&cam->fileop_mutex);
989
990 return 0;
991}
992
993/*****************************************************************************/
994
995static int
996zc0301_vidioc_querycap(struct zc0301_device* cam, void __user * arg)
997{
998 struct v4l2_capability cap = {
999 .driver = "zc0301",
1000 .version = ZC0301_MODULE_VERSION_CODE,
1001 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
d56410e0 1002 V4L2_CAP_STREAMING,
60f78052
LR		 1003 };
1004
1005 strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1006 if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1007 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
d56410e0 1008 sizeof(cap.bus_info));
60f78052
LR		 1009
1010 if (copy_to_user(arg, &cap, sizeof(cap)))
1011 return -EFAULT;
1012
1013 return 0;
1014}
1015
1016
1017static int
1018zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
1019{
1020 struct v4l2_input i;
1021
1022 if (copy_from_user(&i, arg, sizeof(i)))
1023 return -EFAULT;
1024
1025 if (i.index)
1026 return -EINVAL;
1027
1028 memset(&i, 0, sizeof(i));
1029 strcpy(i.name, "Camera");
9e47a52b 1030 i.type = V4L2_INPUT_TYPE_CAMERA;
60f78052
LR		 1031
1032 if (copy_to_user(arg, &i, sizeof(i)))
1033 return -EFAULT;
1034
1035 return 0;
1036}
1037
1038
1039static int
9e47a52b
LR		 1040zc0301_vidioc_g_input(struct zc0301_device* cam, void __user * arg)
1041{
1042 int index = 0;
1043
1044 if (copy_to_user(arg, &index, sizeof(index)))
1045 return -EFAULT;
1046
1047 return 0;
1048}
1049
1050
1051static int
1052zc0301_vidioc_s_input(struct zc0301_device* cam, void __user * arg)
60f78052
LR		 1053{
1054 int index;
1055
1056 if (copy_from_user(&index, arg, sizeof(index)))
1057 return -EFAULT;
1058
1059 if (index != 0)
1060 return -EINVAL;
1061
1062 return 0;
1063}
1064
1065
1066static int
1067zc0301_vidioc_query_ctrl(struct zc0301_device* cam, void __user * arg)
1068{
a8474239 1069 struct zc0301_sensor* s = &cam->sensor;
60f78052
LR		 1070 struct v4l2_queryctrl qc;
1071 u8 i;
1072
1073 if (copy_from_user(&qc, arg, sizeof(qc)))
1074 return -EFAULT;
1075
1076 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1077 if (qc.id && qc.id == s->qctrl[i].id) {
1078 memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1079 if (copy_to_user(arg, &qc, sizeof(qc)))
1080 return -EFAULT;
1081 return 0;
1082 }
1083
1084 return -EINVAL;
1085}
1086
1087
1088static int
1089zc0301_vidioc_g_ctrl(struct zc0301_device* cam, void __user * arg)
1090{
a8474239 1091 struct zc0301_sensor* s = &cam->sensor;
60f78052
LR		 1092 struct v4l2_control ctrl;
1093 int err = 0;
1094 u8 i;
1095
1096 if (!s->get_ctrl && !s->set_ctrl)
1097 return -EINVAL;
1098
1099 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1100 return -EFAULT;
1101
1102 if (!s->get_ctrl) {
1103 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1104 if (ctrl.id == s->qctrl[i].id) {
1105 ctrl.value = s->_qctrl[i].default_value;
1106 goto exit;
1107 }
1108 return -EINVAL;
1109 } else
1110 err = s->get_ctrl(cam, &ctrl);
1111
1112exit:
1113 if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1114 return -EFAULT;
1115
1116 return err;
1117}
1118
1119
1120static int
1121zc0301_vidioc_s_ctrl(struct zc0301_device* cam, void __user * arg)
1122{
a8474239 1123 struct zc0301_sensor* s = &cam->sensor;
60f78052
LR		 1124 struct v4l2_control ctrl;
1125 u8 i;
1126 int err = 0;
1127
1128 if (!s->set_ctrl)
1129 return -EINVAL;
1130
1131 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1132 return -EFAULT;
1133
1134 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1135 if (ctrl.id == s->qctrl[i].id) {
a8474239
LR		 1136 if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1137 return -EINVAL;
60f78052
LR		 1138 if (ctrl.value < s->qctrl[i].minimum ||
1139 ctrl.value > s->qctrl[i].maximum)
1140 return -ERANGE;
1141 ctrl.value -= ctrl.value % s->qctrl[i].step;
1142 break;
1143 }
1144
1145 if ((err = s->set_ctrl(cam, &ctrl)))
1146 return err;
1147
1148 s->_qctrl[i].default_value = ctrl.value;
1149
1150 return 0;
1151}
1152
1153
1154static int
1155zc0301_vidioc_cropcap(struct zc0301_device* cam, void __user * arg)
1156{
a8474239 1157 struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
60f78052
LR		 1158
1159 cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1160 cc->pixelaspect.numerator = 1;
1161 cc->pixelaspect.denominator = 1;
1162
1163 if (copy_to_user(arg, cc, sizeof(*cc)))
1164 return -EFAULT;
1165
1166 return 0;
1167}
1168
1169
1170static int
1171zc0301_vidioc_g_crop(struct zc0301_device* cam, void __user * arg)
1172{
a8474239 1173 struct zc0301_sensor* s = &cam->sensor;
60f78052
LR		 1174 struct v4l2_crop crop = {
1175 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1176 };
1177
1178 memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1179
1180 if (copy_to_user(arg, &crop, sizeof(crop)))
1181 return -EFAULT;
1182
1183 return 0;
1184}
1185
1186
1187static int
1188zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg)
1189{
a8474239 1190 struct zc0301_sensor* s = &cam->sensor;
60f78052
LR		 1191 struct v4l2_crop crop;
1192 struct v4l2_rect* rect;
1193 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1194 const enum zc0301_stream_state stream = cam->stream;
1195 const u32 nbuffers = cam->nbuffers;
1196 u32 i;
1197 int err = 0;
1198
1199 if (copy_from_user(&crop, arg, sizeof(crop)))
1200 return -EFAULT;
1201
1202 rect = &(crop.c);
1203
1204 if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1205 return -EINVAL;
1206
1207 if (cam->module_param.force_munmap)
1208 for (i = 0; i < cam->nbuffers; i++)
1209 if (cam->frame[i].vma_use_count) {
1210 DBG(3, "VIDIOC_S_CROP failed. "
1211 "Unmap the buffers first.");
1212 return -EINVAL;
1213 }
1214
1215 if (!s->set_crop) {
1216 memcpy(rect, &(s->_rect), sizeof(*rect));
1217 if (copy_to_user(arg, &crop, sizeof(crop)))
1218 return -EFAULT;
1219 return 0;
1220 }
1221
1222 rect->left &= ~7L;
1223 rect->top &= ~7L;
1224 if (rect->width < 8)
1225 rect->width = 8;
1226 if (rect->height < 8)
1227 rect->height = 8;
1228 if (rect->width > bounds->width)
1229 rect->width = bounds->width;
1230 if (rect->height > bounds->height)
1231 rect->height = bounds->height;
1232 if (rect->left < bounds->left)
1233 rect->left = bounds->left;
1234 if (rect->top < bounds->top)
1235 rect->top = bounds->top;
1236 if (rect->left + rect->width > bounds->left + bounds->width)
1237 rect->left = bounds->left+bounds->width - rect->width;
1238 if (rect->top + rect->height > bounds->top + bounds->height)
1239 rect->top = bounds->top+bounds->height - rect->height;
1240 rect->width &= ~7L;
1241 rect->height &= ~7L;
1242
1243 if (cam->stream == STREAM_ON)
1244 if ((err = zc0301_stream_interrupt(cam)))
1245 return err;
1246
1247 if (copy_to_user(arg, &crop, sizeof(crop))) {
1248 cam->stream = stream;
1249 return -EFAULT;
1250 }
1251
1252 if (cam->module_param.force_munmap || cam->io == IO_READ)
1253 zc0301_release_buffers(cam);
1254
1255 if (s->set_crop)
1256 err += s->set_crop(cam, rect);
1257
1258 if (err) { /* atomic, no rollback in ioctl() */
1259 cam->state |= DEV_MISCONFIGURED;
1260 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1261 "use the camera, close and open /dev/video%d again.",
1262 cam->v4ldev->minor);
1263 return -EIO;
1264 }
1265
1266 s->pix_format.width = rect->width;
1267 s->pix_format.height = rect->height;
1268 memcpy(&(s->_rect), rect, sizeof(*rect));
1269
1270 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1271 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1272 cam->state |= DEV_MISCONFIGURED;
1273 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1274 "use the camera, close and open /dev/video%d again.",
1275 cam->v4ldev->minor);
1276 return -ENOMEM;
1277 }
1278
1279 if (cam->io == IO_READ)
1280 zc0301_empty_framequeues(cam);
1281 else if (cam->module_param.force_munmap)
1282 zc0301_requeue_outqueue(cam);
1283
1284 cam->stream = stream;
1285
1286 return 0;
1287}
1288
1289
1290static int
1291zc0301_vidioc_enum_fmt(struct zc0301_device* cam, void __user * arg)
1292{
1293 struct v4l2_fmtdesc fmtd;
1294
1295 if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1296 return -EFAULT;
1297
1298 if (fmtd.index == 0) {
1299 strcpy(fmtd.description, "JPEG");
1300 fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
1301 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1302 } else
1303 return -EINVAL;
1304
1305 fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1306 memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1307
1308 if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1309 return -EFAULT;
1310
1311 return 0;
1312}
1313
1314
1315static int
1316zc0301_vidioc_g_fmt(struct zc0301_device* cam, void __user * arg)
1317{
1318 struct v4l2_format format;
a8474239 1319 struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
60f78052
LR		 1320
1321 if (copy_from_user(&format, arg, sizeof(format)))
1322 return -EFAULT;
1323
1324 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1325 return -EINVAL;
1326
1327 pfmt->bytesperline = 0;
1328 pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1329 pfmt->field = V4L2_FIELD_NONE;
1330 memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1331
1332 if (copy_to_user(arg, &format, sizeof(format)))
1333 return -EFAULT;
1334
1335 return 0;
1336}
1337
1338
1339static int
1340zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd,
d56410e0 1341 void __user * arg)
60f78052 1342{
a8474239 1343 struct zc0301_sensor* s = &cam->sensor;
60f78052
LR		 1344 struct v4l2_format format;
1345 struct v4l2_pix_format* pix;
1346 struct v4l2_pix_format* pfmt = &(s->pix_format);
1347 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1348 struct v4l2_rect rect;
1349 const enum zc0301_stream_state stream = cam->stream;
1350 const u32 nbuffers = cam->nbuffers;
1351 u32 i;
1352 int err = 0;
1353
1354 if (copy_from_user(&format, arg, sizeof(format)))
1355 return -EFAULT;
1356
1357 pix = &(format.fmt.pix);
1358
1359 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1360 return -EINVAL;
1361
1362 memcpy(&rect, &(s->_rect), sizeof(rect));
1363
1364 if (!s->set_crop) {
1365 pix->width = rect.width;
1366 pix->height = rect.height;
1367 } else {
1368 rect.width = pix->width;
1369 rect.height = pix->height;
1370 }
1371
1372 if (rect.width < 8)
1373 rect.width = 8;
1374 if (rect.height < 8)
1375 rect.height = 8;
1376 if (rect.width > bounds->left + bounds->width - rect.left)
1377 rect.width = bounds->left + bounds->width - rect.left;
1378 if (rect.height > bounds->top + bounds->height - rect.top)
1379 rect.height = bounds->top + bounds->height - rect.top;
1380 rect.width &= ~7L;
1381 rect.height &= ~7L;
1382
1383 pix->width = rect.width;
1384 pix->height = rect.height;
1385 pix->pixelformat = pfmt->pixelformat;
1386 pix->priv = pfmt->priv;
1387 pix->colorspace = pfmt->colorspace;
1388 pix->bytesperline = 0;
1389 pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1390 pix->field = V4L2_FIELD_NONE;
1391
1392 if (cmd == VIDIOC_TRY_FMT) {
1393 if (copy_to_user(arg, &format, sizeof(format)))
1394 return -EFAULT;
1395 return 0;
1396 }
1397
1398 if (cam->module_param.force_munmap)
1399 for (i = 0; i < cam->nbuffers; i++)
1400 if (cam->frame[i].vma_use_count) {
1401 DBG(3, "VIDIOC_S_FMT failed. "
1402 "Unmap the buffers first.");
1403 return -EINVAL;
1404 }
1405
1406 if (cam->stream == STREAM_ON)
1407 if ((err = zc0301_stream_interrupt(cam)))
1408 return err;
1409
1410 if (copy_to_user(arg, &format, sizeof(format))) {
1411 cam->stream = stream;
1412 return -EFAULT;
1413 }
1414
1415 if (cam->module_param.force_munmap || cam->io == IO_READ)
1416 zc0301_release_buffers(cam);
1417
1418 if (s->set_crop)
1419 err += s->set_crop(cam, &rect);
1420
1421 if (err) { /* atomic, no rollback in ioctl() */
1422 cam->state |= DEV_MISCONFIGURED;
1423 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1424 "use the camera, close and open /dev/video%d again.",
1425 cam->v4ldev->minor);
1426 return -EIO;
1427 }
1428
1429 memcpy(pfmt, pix, sizeof(*pix));
1430 memcpy(&(s->_rect), &rect, sizeof(rect));
1431
1432 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1433 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1434 cam->state |= DEV_MISCONFIGURED;
1435 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
1436 "use the camera, close and open /dev/video%d again.",
1437 cam->v4ldev->minor);
1438 return -ENOMEM;
1439 }
1440
1441 if (cam->io == IO_READ)
1442 zc0301_empty_framequeues(cam);
1443 else if (cam->module_param.force_munmap)
1444 zc0301_requeue_outqueue(cam);
1445
1446 cam->stream = stream;
1447
1448 return 0;
1449}
1450
1451
1452static int
1453zc0301_vidioc_g_jpegcomp(struct zc0301_device* cam, void __user * arg)
1454{
1455 if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
1456 return -EFAULT;
1457
1458 return 0;
1459}
1460
1461
1462static int
1463zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg)
1464{
1465 struct v4l2_jpegcompression jc;
1466 const enum zc0301_stream_state stream = cam->stream;
1467 int err = 0;
1468
1469 if (copy_from_user(&jc, arg, sizeof(jc)))
1470 return -EFAULT;
1471
9e47a52b 1472 if (jc.quality != 0)
60f78052
LR		 1473 return -EINVAL;
1474
1475 if (cam->stream == STREAM_ON)
1476 if ((err = zc0301_stream_interrupt(cam)))
1477 return err;
1478
1479 err += zc0301_set_compression(cam, &jc);
1480 if (err) { /* atomic, no rollback in ioctl() */
1481 cam->state |= DEV_MISCONFIGURED;
1482 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
1483 "problems. To use the camera, close and open "
1484 "/dev/video%d again.", cam->v4ldev->minor);
1485 return -EIO;
1486 }
1487
1488 cam->compression.quality = jc.quality;
1489
1490 cam->stream = stream;
1491
1492 return 0;
1493}
1494
1495
1496static int
1497zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg)
1498{
1499 struct v4l2_requestbuffers rb;
1500 u32 i;
1501 int err;
1502
1503 if (copy_from_user(&rb, arg, sizeof(rb)))
1504 return -EFAULT;
1505
1506 if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1507 rb.memory != V4L2_MEMORY_MMAP)
1508 return -EINVAL;
1509
1510 if (cam->io == IO_READ) {
1511 DBG(3, "Close and open the device again to choose the mmap "
1512 "I/O method");
1513 return -EINVAL;
1514 }
1515
1516 for (i = 0; i < cam->nbuffers; i++)
1517 if (cam->frame[i].vma_use_count) {
1518 DBG(3, "VIDIOC_REQBUFS failed. "
1519 "Previous buffers are still mapped.");
1520 return -EINVAL;
1521 }
1522
1523 if (cam->stream == STREAM_ON)
1524 if ((err = zc0301_stream_interrupt(cam)))
1525 return err;
1526
1527 zc0301_empty_framequeues(cam);
1528
1529 zc0301_release_buffers(cam);
1530 if (rb.count)
1531 rb.count = zc0301_request_buffers(cam, rb.count, IO_MMAP);
1532
1533 if (copy_to_user(arg, &rb, sizeof(rb))) {
1534 zc0301_release_buffers(cam);
1535 cam->io = IO_NONE;
1536 return -EFAULT;
1537 }
1538
1539 cam->io = rb.count ? IO_MMAP : IO_NONE;
1540
1541 return 0;
1542}
1543
1544
1545static int
1546zc0301_vidioc_querybuf(struct zc0301_device* cam, void __user * arg)
1547{
1548 struct v4l2_buffer b;
1549
1550 if (copy_from_user(&b, arg, sizeof(b)))
1551 return -EFAULT;
1552
1553 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1554 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1555 return -EINVAL;
1556
1557 memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
1558
1559 if (cam->frame[b.index].vma_use_count)
1560 b.flags |= V4L2_BUF_FLAG_MAPPED;
1561
1562 if (cam->frame[b.index].state == F_DONE)
1563 b.flags |= V4L2_BUF_FLAG_DONE;
1564 else if (cam->frame[b.index].state != F_UNUSED)
1565 b.flags |= V4L2_BUF_FLAG_QUEUED;
1566
1567 if (copy_to_user(arg, &b, sizeof(b)))
1568 return -EFAULT;
1569
1570 return 0;
1571}
1572
1573
1574static int
1575zc0301_vidioc_qbuf(struct zc0301_device* cam, void __user * arg)
1576{
1577 struct v4l2_buffer b;
1578 unsigned long lock_flags;
1579
1580 if (copy_from_user(&b, arg, sizeof(b)))
1581 return -EFAULT;
1582
1583 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1584 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1585 return -EINVAL;
1586
1587 if (cam->frame[b.index].state != F_UNUSED)
1588 return -EINVAL;
1589
1590 cam->frame[b.index].state = F_QUEUED;
1591
1592 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1593 list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
1594 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1595
1596 PDBGG("Frame #%lu queued", (unsigned long)b.index);
1597
1598 return 0;
1599}
1600
1601
1602static int
1603zc0301_vidioc_dqbuf(struct zc0301_device* cam, struct file* filp,
d56410e0 1604 void __user * arg)
60f78052
LR		 1605{
1606 struct v4l2_buffer b;
1607 struct zc0301_frame_t *f;
1608 unsigned long lock_flags;
1609 long timeout;
1610
1611 if (copy_from_user(&b, arg, sizeof(b)))
1612 return -EFAULT;
1613
1614 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
1615 return -EINVAL;
1616
1617 if (list_empty(&cam->outqueue)) {
1618 if (cam->stream == STREAM_OFF)
1619 return -EINVAL;
1620 if (filp->f_flags & O_NONBLOCK)
1621 return -EAGAIN;
1622 timeout = wait_event_interruptible_timeout
d56410e0
MCC		 1623 ( cam->wait_frame,
1624 (!list_empty(&cam->outqueue)) ||
1625 (cam->state & DEV_DISCONNECTED) ||
1626 (cam->state & DEV_MISCONFIGURED),
1627 cam->module_param.frame_timeout *
1628 1000 * msecs_to_jiffies(1) );
60f78052
LR		 1629 if (timeout < 0)
1630 return timeout;
1631 if (cam->state & DEV_DISCONNECTED)
1632 return -ENODEV;
1633 if (!timeout || (cam->state & DEV_MISCONFIGURED))
1634 return -EIO;
1635 }
1636
1637 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1638 f = list_entry(cam->outqueue.next, struct zc0301_frame_t, frame);
1639 list_del(cam->outqueue.next);
1640 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1641
1642 f->state = F_UNUSED;
1643
1644 memcpy(&b, &f->buf, sizeof(b));
1645 if (f->vma_use_count)
1646 b.flags |= V4L2_BUF_FLAG_MAPPED;
1647
1648 if (copy_to_user(arg, &b, sizeof(b)))
1649 return -EFAULT;
1650
1651 PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
1652
1653 return 0;
1654}
1655
1656
1657static int
1658zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg)
1659{
1660 int type;
1661
1662 if (copy_from_user(&type, arg, sizeof(type)))
1663 return -EFAULT;
1664
1665 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1666 return -EINVAL;
1667
1668 if (list_empty(&cam->inqueue))
1669 return -EINVAL;
1670
1671 cam->stream = STREAM_ON;
1672
1673 DBG(3, "Stream on");
1674
1675 return 0;
1676}
1677
1678
1679static int
1680zc0301_vidioc_streamoff(struct zc0301_device* cam, void __user * arg)
1681{
1682 int type, err;
1683
1684 if (copy_from_user(&type, arg, sizeof(type)))
1685 return -EFAULT;
1686
1687 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1688 return -EINVAL;
1689
1690 if (cam->stream == STREAM_ON)
1691 if ((err = zc0301_stream_interrupt(cam)))
1692 return err;
1693
1694 zc0301_empty_framequeues(cam);
1695
1696 DBG(3, "Stream off");
1697
1698 return 0;
1699}
1700
1701
1702static int
1703zc0301_vidioc_g_parm(struct zc0301_device* cam, void __user * arg)
1704{
1705 struct v4l2_streamparm sp;
1706
1707 if (copy_from_user(&sp, arg, sizeof(sp)))
1708 return -EFAULT;
1709
1710 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1711 return -EINVAL;
1712
1713 sp.parm.capture.extendedmode = 0;
1714 sp.parm.capture.readbuffers = cam->nreadbuffers;
1715
1716 if (copy_to_user(arg, &sp, sizeof(sp)))
1717 return -EFAULT;
1718
1719 return 0;
1720}
1721
1722
1723static int
1724zc0301_vidioc_s_parm(struct zc0301_device* cam, void __user * arg)
1725{
1726 struct v4l2_streamparm sp;
1727
1728 if (copy_from_user(&sp, arg, sizeof(sp)))
1729 return -EFAULT;
1730
1731 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1732 return -EINVAL;
1733
1734 sp.parm.capture.extendedmode = 0;
1735
1736 if (sp.parm.capture.readbuffers == 0)
1737 sp.parm.capture.readbuffers = cam->nreadbuffers;
1738
1739 if (sp.parm.capture.readbuffers > ZC0301_MAX_FRAMES)
1740 sp.parm.capture.readbuffers = ZC0301_MAX_FRAMES;
1741
1742 if (copy_to_user(arg, &sp, sizeof(sp)))
1743 return -EFAULT;
1744
1745 cam->nreadbuffers = sp.parm.capture.readbuffers;
1746
1747 return 0;
1748}
1749
1750
1751static int zc0301_ioctl_v4l2(struct inode* inode, struct file* filp,
d56410e0 1752 unsigned int cmd, void __user * arg)
60f78052
LR		 1753{
1754 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1755
1756 switch (cmd) {
1757
1758 case VIDIOC_QUERYCAP:
1759 return zc0301_vidioc_querycap(cam, arg);
1760
1761 case VIDIOC_ENUMINPUT:
1762 return zc0301_vidioc_enuminput(cam, arg);
1763
1764 case VIDIOC_G_INPUT:
9e47a52b
LR		 1765 return zc0301_vidioc_g_input(cam, arg);
1766
60f78052 1767 case VIDIOC_S_INPUT:
9e47a52b 1768 return zc0301_vidioc_s_input(cam, arg);
60f78052
LR		 1769
1770 case VIDIOC_QUERYCTRL:
1771 return zc0301_vidioc_query_ctrl(cam, arg);
1772
1773 case VIDIOC_G_CTRL:
1774 return zc0301_vidioc_g_ctrl(cam, arg);
1775
60f78052
LR		 1776 case VIDIOC_S_CTRL:
1777 return zc0301_vidioc_s_ctrl(cam, arg);
1778
60f78052
LR		 1779 case VIDIOC_CROPCAP:
1780 return zc0301_vidioc_cropcap(cam, arg);
1781
1782 case VIDIOC_G_CROP:
1783 return zc0301_vidioc_g_crop(cam, arg);
1784
1785 case VIDIOC_S_CROP:
1786 return zc0301_vidioc_s_crop(cam, arg);
1787
1788 case VIDIOC_ENUM_FMT:
1789 return zc0301_vidioc_enum_fmt(cam, arg);
1790
1791 case VIDIOC_G_FMT:
1792 return zc0301_vidioc_g_fmt(cam, arg);
1793
1794 case VIDIOC_TRY_FMT:
1795 case VIDIOC_S_FMT:
1796 return zc0301_vidioc_try_s_fmt(cam, cmd, arg);
1797
1798 case VIDIOC_G_JPEGCOMP:
1799 return zc0301_vidioc_g_jpegcomp(cam, arg);
1800
1801 case VIDIOC_S_JPEGCOMP:
1802 return zc0301_vidioc_s_jpegcomp(cam, arg);
1803
1804 case VIDIOC_REQBUFS:
1805 return zc0301_vidioc_reqbufs(cam, arg);
1806
1807 case VIDIOC_QUERYBUF:
1808 return zc0301_vidioc_querybuf(cam, arg);
1809
1810 case VIDIOC_QBUF:
1811 return zc0301_vidioc_qbuf(cam, arg);
1812
1813 case VIDIOC_DQBUF:
1814 return zc0301_vidioc_dqbuf(cam, filp, arg);
1815
1816 case VIDIOC_STREAMON:
1817 return zc0301_vidioc_streamon(cam, arg);
1818
1819 case VIDIOC_STREAMOFF:
1820 return zc0301_vidioc_streamoff(cam, arg);
1821
1822 case VIDIOC_G_PARM:
1823 return zc0301_vidioc_g_parm(cam, arg);
1824
60f78052
LR		 1825 case VIDIOC_S_PARM:
1826 return zc0301_vidioc_s_parm(cam, arg);
1827
1828 case VIDIOC_G_STD:
1829 case VIDIOC_S_STD:
1830 case VIDIOC_QUERYSTD:
1831 case VIDIOC_ENUMSTD:
1832 case VIDIOC_QUERYMENU:
1833 return -EINVAL;
1834
1835 default:
1836 return -EINVAL;
1837
1838 }
1839}
1840
1841
1842static int zc0301_ioctl(struct inode* inode, struct file* filp,
d56410e0 1843 unsigned int cmd, unsigned long arg)
60f78052
LR		 1844{
1845 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1846 int err = 0;
1847
1848 if (mutex_lock_interruptible(&cam->fileop_mutex))
1849 return -ERESTARTSYS;
1850
1851 if (cam->state & DEV_DISCONNECTED) {
1852 DBG(1, "Device not present");
1853 mutex_unlock(&cam->fileop_mutex);
1854 return -ENODEV;
1855 }
1856
1857 if (cam->state & DEV_MISCONFIGURED) {
1858 DBG(1, "The camera is misconfigured. Close and open it "
1859 "again.");
1860 mutex_unlock(&cam->fileop_mutex);
1861 return -EIO;
1862 }
1863
1864 V4LDBG(3, "zc0301", cmd);
1865
1866 err = zc0301_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
1867
1868 mutex_unlock(&cam->fileop_mutex);
1869
1870 return err;
1871}
1872
1873
1874static struct file_operations zc0301_fops = {
1875 .owner = THIS_MODULE,
1876 .open = zc0301_open,
1877 .release = zc0301_release,
1878 .ioctl = zc0301_ioctl,
1879 .read = zc0301_read,
1880 .poll = zc0301_poll,
1881 .mmap = zc0301_mmap,
1882 .llseek = no_llseek,
1883};
1884
1885/*****************************************************************************/
1886
1887static int
1888zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
1889{
1890 struct usb_device *udev = interface_to_usbdev(intf);
1891 struct zc0301_device* cam;
1892 static unsigned int dev_nr = 0;
1893 unsigned int i;
1894 int err = 0;
1895
1896 if (!(cam = kzalloc(sizeof(struct zc0301_device), GFP_KERNEL)))
1897 return -ENOMEM;
1898
1899 cam->usbdev = udev;
1900
1901 if (!(cam->control_buffer = kzalloc(4, GFP_KERNEL))) {
1902 DBG(1, "kmalloc() failed");
1903 err = -ENOMEM;
1904 goto fail;
1905 }
1906
1907 if (!(cam->v4ldev = video_device_alloc())) {
1908 DBG(1, "video_device_alloc() failed");
1909 err = -ENOMEM;
1910 goto fail;
1911 }
1912
1913 mutex_init(&cam->dev_mutex);
1914
a87cde0b 1915 DBG(2, "ZC0301[P] Image Processor and Control Chip detected "
60f78052
LR		 1916 "(vid/pid 0x%04X/0x%04X)",id->idVendor, id->idProduct);
1917
1918 for (i = 0; zc0301_sensor_table[i]; i++) {
1919 err = zc0301_sensor_table[i](cam);
1920 if (!err)
1921 break;
1922 }
1923
a8474239
LR		 1924 if (!err)
1925 DBG(2, "%s image sensor detected", cam->sensor.name);
60f78052
LR		 1926 else {
1927 DBG(1, "No supported image sensor detected");
1928 err = -ENODEV;
1929 goto fail;
1930 }
1931
1932 if (zc0301_init(cam)) {
1933 DBG(1, "Initialization failed. I will retry on open().");
1934 cam->state |= DEV_MISCONFIGURED;
1935 }
1936
a87cde0b 1937 strcpy(cam->v4ldev->name, "ZC0301[P] PC Camera");
60f78052
LR		 1938 cam->v4ldev->owner = THIS_MODULE;
1939 cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
1940 cam->v4ldev->hardware = 0;
1941 cam->v4ldev->fops = &zc0301_fops;
1942 cam->v4ldev->minor = video_nr[dev_nr];
1943 cam->v4ldev->release = video_device_release;
1944 video_set_drvdata(cam->v4ldev, cam);
1945
1946 mutex_lock(&cam->dev_mutex);
1947
1948 err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
d56410e0 1949 video_nr[dev_nr]);
60f78052
LR		 1950 if (err) {
1951 DBG(1, "V4L2 device registration failed");
1952 if (err == -ENFILE && video_nr[dev_nr] == -1)
1953 DBG(1, "Free /dev/videoX node not found");
1954 video_nr[dev_nr] = -1;
1955 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
1956 mutex_unlock(&cam->dev_mutex);
1957 goto fail;
1958 }
1959
1960 DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
1961
1962 cam->module_param.force_munmap = force_munmap[dev_nr];
a8474239 1963 cam->module_param.frame_timeout = frame_timeout[dev_nr];
60f78052
LR		 1964
1965 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
1966
1967 usb_set_intfdata(intf, cam);
1968
1969 mutex_unlock(&cam->dev_mutex);
1970
1971 return 0;
1972
1973fail:
1974 if (cam) {
1975 kfree(cam->control_buffer);
1976 if (cam->v4ldev)
1977 video_device_release(cam->v4ldev);
1978 kfree(cam);
1979 }
1980 return err;
1981}
1982
1983
1984static void zc0301_usb_disconnect(struct usb_interface* intf)
1985{
1986 struct zc0301_device* cam = usb_get_intfdata(intf);
1987
1988 if (!cam)
1989 return;
1990
1991 down_write(&zc0301_disconnect);
1992
1993 mutex_lock(&cam->dev_mutex);
1994
1995 DBG(2, "Disconnecting %s...", cam->v4ldev->name);
1996
1997 wake_up_interruptible_all(&cam->open);
1998
1999 if (cam->users) {
2000 DBG(2, "Device /dev/video%d is open! Deregistration and "
2001 "memory deallocation are deferred on close.",
2002 cam->v4ldev->minor);
2003 cam->state |= DEV_MISCONFIGURED;
2004 zc0301_stop_transfer(cam);
2005 cam->state |= DEV_DISCONNECTED;
2006 wake_up_interruptible(&cam->wait_frame);
9e47a52b 2007 wake_up(&cam->wait_stream);
a8474239 2008 usb_get_dev(cam->usbdev);
60f78052
LR		 2009 } else {
2010 cam->state |= DEV_DISCONNECTED;
2011 zc0301_release_resources(cam);
2012 }
2013
2014 mutex_unlock(&cam->dev_mutex);
2015
2016 if (!cam->users)
2017 kfree(cam);
2018
2019 up_write(&zc0301_disconnect);
2020}
2021
2022
2023static struct usb_driver zc0301_usb_driver = {
2024 .name = "zc0301",
2025 .id_table = zc0301_id_table,
2026 .probe = zc0301_usb_probe,
2027 .disconnect = zc0301_usb_disconnect,
2028};
2029
2030/*****************************************************************************/
2031
2032static int __init zc0301_module_init(void)
2033{
2034 int err = 0;
2035
2036 KDBG(2, ZC0301_MODULE_NAME " v" ZC0301_MODULE_VERSION);
2037 KDBG(3, ZC0301_MODULE_AUTHOR);
2038
2039 if ((err = usb_register(&zc0301_usb_driver)))
2040 KDBG(1, "usb_register() failed");
2041
2042 return err;
2043}
2044
2045
2046static void __exit zc0301_module_exit(void)
2047{
2048 usb_deregister(&zc0301_usb_driver);
2049}
2050
2051
2052module_init(zc0301_module_init);
2053module_exit(zc0301_module_exit);
Linux 6.x block layer and io_uring tree(s)