Merge branch 'dmapool' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc
[linux-2.6] / drivers / media / video / stk-webcam.c
1 /*
2  * stk-webcam.c : Driver for Syntek 1125 USB webcam controller
3  *
4  * Copyright (C) 2006 Nicolas VIVIEN
5  * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
6  *
7  * Some parts are inspired from cafe_ccic.c
8  * Copyright 2006-2007 Jonathan Corbet
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  * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23  */
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/errno.h>
29 #include <linux/slab.h>
30 #include <linux/kref.h>
31
32 #include <linux/usb.h>
33 #include <linux/vmalloc.h>
34 #include <linux/videodev2.h>
35 #include <media/v4l2-common.h>
36
37 #include "stk-webcam.h"
38
39
40 static int hflip = 1;
41 module_param(hflip, bool, 0444);
42 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 1");
43
44 static int vflip = 1;
45 module_param(vflip, bool, 0444);
46 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 1");
47
48 static int debug;
49 module_param(debug, int, 0444);
50 MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
51
52 MODULE_LICENSE("GPL");
53 MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
54 MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
55
56
57
58 /* Some cameras have audio interfaces, we aren't interested in those */
59 static struct usb_device_id stkwebcam_table[] = {
60         { USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
61         { USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
62         { }
63 };
64 MODULE_DEVICE_TABLE(usb, stkwebcam_table);
65
66 void stk_camera_cleanup(struct kref *kref)
67 {
68         struct stk_camera *dev = to_stk_camera(kref);
69
70         STK_INFO("Syntek USB2.0 Camera release resources"
71                 " video device /dev/video%d\n", dev->vdev.minor);
72         video_unregister_device(&dev->vdev);
73         dev->vdev.priv = NULL;
74
75         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
76                 STK_ERROR("We are leaking memory\n");
77         usb_put_intf(dev->interface);
78         kfree(dev);
79 }
80
81
82 /*
83  * Basic stuff
84  */
85 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
86 {
87         struct usb_device *udev = dev->udev;
88         int ret;
89
90         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
91                         0x01,
92                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
93                         value,
94                         index,
95                         NULL,
96                         0,
97                         500);
98         if (ret < 0)
99                 return ret;
100         else
101                 return 0;
102 }
103
104 int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
105 {
106         struct usb_device *udev = dev->udev;
107         int ret;
108
109         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
110                         0x00,
111                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
112                         0x00,
113                         index,
114                         (u8 *) value,
115                         sizeof(u8),
116                         500);
117         if (ret < 0)
118                 return ret;
119         else
120                 return 0;
121 }
122
123 static int stk_start_stream(struct stk_camera *dev)
124 {
125         int value;
126         int i, ret;
127         int value_116, value_117;
128
129         if (!is_present(dev))
130                 return -ENODEV;
131         if (!is_memallocd(dev) || !is_initialised(dev)) {
132                 STK_ERROR("FIXME: Buffers are not allocated\n");
133                 return -EFAULT;
134         }
135         ret = usb_set_interface(dev->udev, 0, 5);
136
137         if (ret < 0)
138                 STK_ERROR("usb_set_interface failed !\n");
139         if (stk_sensor_wakeup(dev))
140                 STK_ERROR("error awaking the sensor\n");
141
142         stk_camera_read_reg(dev, 0x0116, &value_116);
143         stk_camera_read_reg(dev, 0x0117, &value_117);
144
145         stk_camera_write_reg(dev, 0x0116, 0x0000);
146         stk_camera_write_reg(dev, 0x0117, 0x0000);
147
148         stk_camera_read_reg(dev, 0x0100, &value);
149         stk_camera_write_reg(dev, 0x0100, value | 0x80);
150
151         stk_camera_write_reg(dev, 0x0116, value_116);
152         stk_camera_write_reg(dev, 0x0117, value_117);
153         for (i = 0; i < MAX_ISO_BUFS; i++) {
154                 if (dev->isobufs[i].urb) {
155                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
156                         atomic_inc(&dev->urbs_used);
157                         if (ret)
158                                 return ret;
159                 }
160         }
161         set_streaming(dev);
162         return 0;
163 }
164
165 static int stk_stop_stream(struct stk_camera *dev)
166 {
167         int value;
168         int i;
169         if (is_present(dev)) {
170                 stk_camera_read_reg(dev, 0x0100, &value);
171                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
172                 if (dev->isobufs != NULL) {
173                         for (i = 0; i < MAX_ISO_BUFS; i++) {
174                                 if (dev->isobufs[i].urb)
175                                         usb_kill_urb(dev->isobufs[i].urb);
176                         }
177                 }
178                 unset_streaming(dev);
179
180                 if (usb_set_interface(dev->udev, 0, 0))
181                         STK_ERROR("usb_set_interface failed !\n");
182                 if (stk_sensor_sleep(dev))
183                         STK_ERROR("error suspending the sensor\n");
184         }
185         return 0;
186 }
187
188 /*
189  * This seems to be the shortest init sequence we
190  * must do in order to find the sensor
191  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
192  * is also reset. Maybe powers down it?
193  * Rest of values don't make a difference
194  */
195
196 static struct regval stk1125_initvals[] = {
197         /*TODO: What means this sequence? */
198         {0x0000, 0x24},
199         {0x0100, 0x21},
200         {0x0002, 0x68},
201         {0x0003, 0x80},
202         {0x0005, 0x00},
203         {0x0007, 0x03},
204         {0x000d, 0x00},
205         {0x000f, 0x02},
206         {0x0300, 0x12},
207         {0x0350, 0x41},
208         {0x0351, 0x00},
209         {0x0352, 0x00},
210         {0x0353, 0x00},
211         {0x0018, 0x10},
212         {0x0019, 0x00},
213         {0x001b, 0x0e},
214         {0x001c, 0x46},
215         {0x0300, 0x80},
216         {0x001a, 0x04},
217         {0x0110, 0x00},
218         {0x0111, 0x00},
219         {0x0112, 0x00},
220         {0x0113, 0x00},
221
222         {0xffff, 0xff},
223 };
224
225
226 static int stk_initialise(struct stk_camera *dev)
227 {
228         struct regval *rv;
229         int ret;
230         if (!is_present(dev))
231                 return -ENODEV;
232         if (is_initialised(dev))
233                 return 0;
234         rv = stk1125_initvals;
235         while (rv->reg != 0xffff) {
236                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
237                 if (ret)
238                         return ret;
239                 rv++;
240         }
241         if (stk_sensor_init(dev) == 0) {
242                 set_initialised(dev);
243                 return 0;
244         } else
245                 return -1;
246 }
247
248 /* sysfs functions */
249 /*FIXME cleanup this */
250
251 static ssize_t show_brightness(struct device *class,
252                         struct device_attribute *attr, char *buf)
253 {
254         struct video_device *vdev = to_video_device(class);
255         struct stk_camera *dev = vdev_to_camera(vdev);
256
257         return sprintf(buf, "%X\n", dev->vsettings.brightness);
258 }
259
260 static ssize_t store_brightness(struct device *class,
261                 struct device_attribute *attr, const char *buf, size_t count)
262 {
263         char *endp;
264         unsigned long value;
265         int ret;
266
267         struct video_device *vdev = to_video_device(class);
268         struct stk_camera *dev = vdev_to_camera(vdev);
269
270         value = simple_strtoul(buf, &endp, 16);
271
272         dev->vsettings.brightness = (int) value;
273
274         ret = stk_sensor_set_brightness(dev, value >> 8);
275         if (ret)
276                 return ret;
277         else
278                 return count;
279 }
280
281 static ssize_t show_hflip(struct device *class,
282                 struct device_attribute *attr, char *buf)
283 {
284         struct video_device *vdev = to_video_device(class);
285         struct stk_camera *dev = vdev_to_camera(vdev);
286
287         return sprintf(buf, "%d\n", dev->vsettings.hflip);
288 }
289
290 static ssize_t store_hflip(struct device *class,
291                 struct device_attribute *attr, const char *buf, size_t count)
292 {
293         struct video_device *vdev = to_video_device(class);
294         struct stk_camera *dev = vdev_to_camera(vdev);
295
296         if (strncmp(buf, "1", 1) == 0)
297                 dev->vsettings.hflip = 1;
298         else if (strncmp(buf, "0", 1) == 0)
299                 dev->vsettings.hflip = 0;
300         else
301                 return -EINVAL;
302
303         return strlen(buf);
304 }
305
306 static ssize_t show_vflip(struct device *class,
307                 struct device_attribute *attr, char *buf)
308 {
309         struct video_device *vdev = to_video_device(class);
310         struct stk_camera *dev = vdev_to_camera(vdev);
311
312         return sprintf(buf, "%d\n", dev->vsettings.vflip);
313 }
314
315 static ssize_t store_vflip(struct device *class,
316                 struct device_attribute *attr, const char *buf, size_t count)
317 {
318         struct video_device *vdev = to_video_device(class);
319         struct stk_camera *dev = vdev_to_camera(vdev);
320
321         if (strncmp(buf, "1", 1) == 0)
322                 dev->vsettings.vflip = 1;
323         else if (strncmp(buf, "0", 1) == 0)
324                 dev->vsettings.vflip = 0;
325         else
326                 return -EINVAL;
327
328         return strlen(buf);
329 }
330
331 static DEVICE_ATTR(brightness, S_IRUGO | S_IWUGO,
332                         show_brightness, store_brightness);
333 static DEVICE_ATTR(hflip, S_IRUGO | S_IWUGO, show_hflip, store_hflip);
334 static DEVICE_ATTR(vflip, S_IRUGO | S_IWUGO, show_vflip, store_vflip);
335
336 static int stk_create_sysfs_files(struct video_device *vdev)
337 {
338         int ret;
339
340         ret = video_device_create_file(vdev, &dev_attr_brightness);
341         ret += video_device_create_file(vdev, &dev_attr_hflip);
342         ret += video_device_create_file(vdev, &dev_attr_vflip);
343         return ret;
344 }
345
346 static void stk_remove_sysfs_files(struct video_device *vdev)
347 {
348         video_device_remove_file(vdev, &dev_attr_brightness);
349         video_device_remove_file(vdev, &dev_attr_hflip);
350         video_device_remove_file(vdev, &dev_attr_vflip);
351 }
352
353
354 /* *********************************************** */
355 /*
356  * This function is called as an URB transfert is complete (Isochronous pipe).
357  * So, the traitement is done in interrupt time, so it has be fast, not crash,
358  * and not stall. Neat.
359  */
360 static void stk_isoc_handler(struct urb *urb)
361 {
362         int i;
363         int ret;
364         int framelen;
365         unsigned long flags;
366
367         unsigned char *fill = NULL;
368         unsigned char *iso_buf = NULL;
369
370         struct stk_camera *dev;
371         struct stk_sio_buffer *fb;
372
373         dev = (struct stk_camera *) urb->context;
374
375         if (dev == NULL) {
376                 STK_ERROR("isoc_handler called with NULL device !\n");
377                 return;
378         }
379
380         if (urb->status == -ENOENT || urb->status == -ECONNRESET
381                 || urb->status == -ESHUTDOWN) {
382                 atomic_dec(&dev->urbs_used);
383                 return;
384         }
385
386         spin_lock_irqsave(&dev->spinlock, flags);
387
388         if (urb->status != -EINPROGRESS && urb->status != 0) {
389                 STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
390                 goto resubmit;
391         }
392
393         if (list_empty(&dev->sio_avail)) {
394                 /*FIXME Stop streaming after a while */
395                 (void) (printk_ratelimit() &&
396                 STK_ERROR("isoc_handler without available buffer!\n"));
397                 goto resubmit;
398         }
399         fb = list_first_entry(&dev->sio_avail,
400                         struct stk_sio_buffer, list);
401         fill = fb->buffer + fb->v4lbuf.bytesused;
402
403         for (i = 0; i < urb->number_of_packets; i++) {
404                 if (urb->iso_frame_desc[i].status != 0) {
405                         if (urb->iso_frame_desc[i].status != -EXDEV)
406                                 STK_ERROR("Frame %d has error %d\n", i,
407                                         urb->iso_frame_desc[i].status);
408                         continue;
409                 }
410                 framelen = urb->iso_frame_desc[i].actual_length;
411                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
412
413                 if (framelen <= 4)
414                         continue; /* no data */
415
416                 /*
417                  * we found something informational from there
418                  * the isoc frames have to type of headers
419                  * type1: 00 xx 00 00 or 20 xx 00 00
420                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
421                  * xx is a sequencer which has never been seen over 0x3f
422                  * imho data written down looks like bayer, i see similarities
423                  * after every 640 bytes
424                  */
425                 if (*iso_buf & 0x80) {
426                         framelen -= 8;
427                         iso_buf += 8;
428                         /* This marks a new frame */
429                         if (fb->v4lbuf.bytesused != 0
430                                 && fb->v4lbuf.bytesused != dev->frame_size) {
431                                 (void) (printk_ratelimit() &&
432                                 STK_ERROR("frame %d, "
433                                         "bytesused=%d, skipping\n",
434                                         i, fb->v4lbuf.bytesused));
435                                 fb->v4lbuf.bytesused = 0;
436                                 fill = fb->buffer;
437                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
438                                 list_move_tail(dev->sio_avail.next,
439                                         &dev->sio_full);
440                                 wake_up(&dev->wait_frame);
441                                 if (list_empty(&dev->sio_avail)) {
442                                         (void) (printk_ratelimit() &&
443                                         STK_ERROR("No buffer available\n"));
444                                         goto resubmit;
445                                 }
446                                 fb = list_first_entry(&dev->sio_avail,
447                                         struct stk_sio_buffer, list);
448                                 fb->v4lbuf.bytesused = 0;
449                                 fill = fb->buffer;
450                         }
451                 } else {
452                         framelen -= 4;
453                         iso_buf += 4;
454                 }
455
456                 /* Our buffer is full !!! */
457                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
458                         (void) (printk_ratelimit() &&
459                         STK_ERROR("Frame buffer overflow, lost sync\n"));
460                         /*FIXME Do something here? */
461                         continue;
462                 }
463                 spin_unlock_irqrestore(&dev->spinlock, flags);
464                 memcpy(fill, iso_buf, framelen);
465                 spin_lock_irqsave(&dev->spinlock, flags);
466                 fill += framelen;
467
468                 /* New size of our buffer */
469                 fb->v4lbuf.bytesused += framelen;
470         }
471
472 resubmit:
473         spin_unlock_irqrestore(&dev->spinlock, flags);
474         urb->dev = dev->udev;
475         ret = usb_submit_urb(urb, GFP_ATOMIC);
476         if (ret != 0) {
477                 STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
478                         ret);
479         }
480 }
481
482 /* -------------------------------------------- */
483
484 static int stk_prepare_iso(struct stk_camera *dev)
485 {
486         void *kbuf;
487         int i, j;
488         struct urb *urb;
489         struct usb_device *udev;
490
491         if (dev == NULL)
492                 return -ENXIO;
493         udev = dev->udev;
494
495         if (dev->isobufs)
496                 STK_ERROR("isobufs already allocated. Bad\n");
497         else
498                 dev->isobufs = kzalloc(MAX_ISO_BUFS * sizeof(*dev->isobufs),
499                                         GFP_KERNEL);
500         if (dev->isobufs == NULL) {
501                 STK_ERROR("Unable to allocate iso buffers\n");
502                 return -ENOMEM;
503         }
504         for (i = 0; i < MAX_ISO_BUFS; i++) {
505                 if (dev->isobufs[i].data == NULL) {
506                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
507                         if (kbuf == NULL) {
508                                 STK_ERROR("Failed to allocate iso buffer %d\n",
509                                         i);
510                                 goto isobufs_out;
511                         }
512                         dev->isobufs[i].data = kbuf;
513                 } else
514                         STK_ERROR("isobuf data already allocated\n");
515                 if (dev->isobufs[i].urb == NULL) {
516                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
517                         if (urb == NULL) {
518                                 STK_ERROR("Failed to allocate URB %d\n", i);
519                                 goto isobufs_out;
520                         }
521                         dev->isobufs[i].urb = urb;
522                 } else {
523                         STK_ERROR("Killing URB\n");
524                         usb_kill_urb(dev->isobufs[i].urb);
525                         urb = dev->isobufs[i].urb;
526                 }
527                 urb->interval = 1;
528                 urb->dev = udev;
529                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
530                 urb->transfer_flags = URB_ISO_ASAP;
531                 urb->transfer_buffer = dev->isobufs[i].data;
532                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
533                 urb->complete = stk_isoc_handler;
534                 urb->context = dev;
535                 urb->start_frame = 0;
536                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
537
538                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
539                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
540                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
541                 }
542         }
543         set_memallocd(dev);
544         return 0;
545
546 isobufs_out:
547         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
548                 kfree(dev->isobufs[i].data);
549         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
550                 usb_free_urb(dev->isobufs[i].urb);
551         kfree(dev->isobufs);
552         dev->isobufs = NULL;
553         return -ENOMEM;
554 }
555
556 static void stk_clean_iso(struct stk_camera *dev)
557 {
558         int i;
559
560         if (dev == NULL || dev->isobufs == NULL)
561                 return;
562
563         for (i = 0; i < MAX_ISO_BUFS; i++) {
564                 struct urb *urb;
565
566                 urb = dev->isobufs[i].urb;
567                 if (urb) {
568                         if (atomic_read(&dev->urbs_used))
569                                 usb_kill_urb(urb);
570                         usb_free_urb(urb);
571                 }
572                 kfree(dev->isobufs[i].data);
573         }
574         kfree(dev->isobufs);
575         dev->isobufs = NULL;
576         unset_memallocd(dev);
577 }
578
579 static int stk_setup_siobuf(struct stk_camera *dev, int index)
580 {
581         struct stk_sio_buffer *buf = dev->sio_bufs + index;
582         INIT_LIST_HEAD(&buf->list);
583         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
584         buf->buffer = vmalloc_user(buf->v4lbuf.length);
585         if (buf->buffer == NULL)
586                 return -ENOMEM;
587         buf->mapcount = 0;
588         buf->dev = dev;
589         buf->v4lbuf.index = index;
590         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
591         buf->v4lbuf.field = V4L2_FIELD_NONE;
592         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
593         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
594         return 0;
595 }
596
597 static int stk_free_sio_buffers(struct stk_camera *dev)
598 {
599         int i;
600         int nbufs;
601         unsigned long flags;
602         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
603                 return 0;
604         /*
605         * If any buffers are mapped, we cannot free them at all.
606         */
607         for (i = 0; i < dev->n_sbufs; i++) {
608                 if (dev->sio_bufs[i].mapcount > 0)
609                         return -EBUSY;
610         }
611         /*
612         * OK, let's do it.
613         */
614         spin_lock_irqsave(&dev->spinlock, flags);
615         INIT_LIST_HEAD(&dev->sio_avail);
616         INIT_LIST_HEAD(&dev->sio_full);
617         nbufs = dev->n_sbufs;
618         dev->n_sbufs = 0;
619         spin_unlock_irqrestore(&dev->spinlock, flags);
620         for (i = 0; i < nbufs; i++) {
621                 if (dev->sio_bufs[i].buffer != NULL)
622                         vfree(dev->sio_bufs[i].buffer);
623         }
624         kfree(dev->sio_bufs);
625         dev->sio_bufs = NULL;
626         return 0;
627 }
628
629 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
630 {
631         int i;
632         if (dev->sio_bufs != NULL)
633                 STK_ERROR("sio_bufs already allocated\n");
634         else {
635                 dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
636                                 GFP_KERNEL);
637                 if (dev->sio_bufs == NULL)
638                         return -ENOMEM;
639                 for (i = 0; i < n_sbufs; i++) {
640                         if (stk_setup_siobuf(dev, i))
641                                 return (dev->n_sbufs > 1)? 0 : -ENOMEM;
642                         dev->n_sbufs = i+1;
643                 }
644         }
645         return 0;
646 }
647
648 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
649 {
650         int err;
651         err = stk_prepare_iso(dev);
652         if (err) {
653                 stk_clean_iso(dev);
654                 return err;
655         }
656         err = stk_prepare_sio_buffers(dev, n_sbufs);
657         if (err) {
658                 stk_free_sio_buffers(dev);
659                 return err;
660         }
661         return 0;
662 }
663
664 static void stk_free_buffers(struct stk_camera *dev)
665 {
666         stk_clean_iso(dev);
667         stk_free_sio_buffers(dev);
668 }
669 /* -------------------------------------------- */
670
671 /* v4l file operations */
672
673 static int v4l_stk_open(struct inode *inode, struct file *fp)
674 {
675         struct stk_camera *dev;
676         struct video_device *vdev;
677
678         vdev = video_devdata(fp);
679         dev = vdev_to_camera(vdev);
680
681         if (dev == NULL || !is_present(dev))
682                 return -ENXIO;
683         fp->private_data = vdev;
684         kref_get(&dev->kref);
685
686         return 0;
687 }
688
689 static int v4l_stk_release(struct inode *inode, struct file *fp)
690 {
691         struct stk_camera *dev;
692         struct video_device *vdev;
693
694         vdev = video_devdata(fp);
695         if (vdev == NULL) {
696                 STK_ERROR("v4l_release called w/o video devdata\n");
697                 return -EFAULT;
698         }
699         dev = vdev_to_camera(vdev);
700         if (dev == NULL) {
701                 STK_ERROR("v4l_release called on removed device\n");
702                 return -ENODEV;
703         }
704
705         if (dev->owner != fp) {
706                 kref_put(&dev->kref, stk_camera_cleanup);
707                 return 0;
708         }
709
710         stk_stop_stream(dev);
711
712         stk_free_buffers(dev);
713
714         dev->owner = NULL;
715
716         kref_put(&dev->kref, stk_camera_cleanup);
717
718         return 0;
719 }
720
721 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
722                 size_t count, loff_t *f_pos)
723 {
724         int i;
725         int ret;
726         unsigned long flags;
727         struct stk_camera *dev;
728         struct video_device *vdev;
729         struct stk_sio_buffer *sbuf;
730
731         vdev = video_devdata(fp);
732         if (vdev == NULL)
733                 return -EFAULT;
734         dev = vdev_to_camera(vdev);
735
736         if (dev == NULL)
737                 return -EIO;
738
739         if (!is_present(dev))
740                 return -EIO;
741         if (dev->owner && dev->owner != fp)
742                 return -EBUSY;
743         dev->owner = fp;
744         if (!is_streaming(dev)) {
745                 if (stk_initialise(dev)
746                         || stk_allocate_buffers(dev, 3)
747                         || stk_start_stream(dev))
748                         return -ENOMEM;
749                 spin_lock_irqsave(&dev->spinlock, flags);
750                 for (i = 0; i < dev->n_sbufs; i++) {
751                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
752                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
753                 }
754                 spin_unlock_irqrestore(&dev->spinlock, flags);
755         }
756         if (*f_pos == 0) {
757                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
758                         return -EWOULDBLOCK;
759                 ret = wait_event_interruptible(dev->wait_frame,
760                         !list_empty(&dev->sio_full) || !is_present(dev));
761                 if (ret)
762                         return ret;
763                 if (!is_present(dev))
764                         return -EIO;
765         }
766         if (count + *f_pos > dev->frame_size)
767                 count = dev->frame_size - *f_pos;
768         spin_lock_irqsave(&dev->spinlock, flags);
769         if (list_empty(&dev->sio_full)) {
770                 spin_unlock_irqrestore(&dev->spinlock, flags);
771                 STK_ERROR("BUG: No siobufs ready\n");
772                 return 0;
773         }
774         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
775         spin_unlock_irqrestore(&dev->spinlock, flags);
776
777         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
778                 return -EFAULT;
779
780         *f_pos += count;
781
782         if (*f_pos >= dev->frame_size) {
783                 *f_pos = 0;
784                 spin_lock_irqsave(&dev->spinlock, flags);
785                 list_move_tail(&sbuf->list, &dev->sio_avail);
786                 spin_unlock_irqrestore(&dev->spinlock, flags);
787         }
788         return count;
789 }
790
791 static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
792 {
793         struct stk_camera *dev;
794         struct video_device *vdev;
795
796         vdev = video_devdata(fp);
797
798         if (vdev == NULL)
799                 return -EFAULT;
800
801         dev = vdev_to_camera(vdev);
802         if (dev == NULL)
803                 return -ENODEV;
804
805         poll_wait(fp, &dev->wait_frame, wait);
806
807         if (!is_present(dev))
808                 return POLLERR;
809
810         if (!list_empty(&dev->sio_full))
811                 return (POLLIN | POLLRDNORM);
812
813         return 0;
814 }
815
816
817 static void stk_v4l_vm_open(struct vm_area_struct *vma)
818 {
819         struct stk_sio_buffer *sbuf = vma->vm_private_data;
820         sbuf->mapcount++;
821 }
822 static void stk_v4l_vm_close(struct vm_area_struct *vma)
823 {
824         struct stk_sio_buffer *sbuf = vma->vm_private_data;
825         sbuf->mapcount--;
826         if (sbuf->mapcount == 0)
827                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
828 }
829 static struct vm_operations_struct stk_v4l_vm_ops = {
830         .open = stk_v4l_vm_open,
831         .close = stk_v4l_vm_close
832 };
833
834 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
835 {
836         unsigned int i;
837         int ret;
838         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
839         struct stk_camera *dev;
840         struct video_device *vdev;
841         struct stk_sio_buffer *sbuf = NULL;
842
843         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
844                 return -EINVAL;
845
846         vdev = video_devdata(fp);
847         dev = vdev_to_camera(vdev);
848
849         for (i = 0; i < dev->n_sbufs; i++) {
850                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
851                         sbuf = dev->sio_bufs + i;
852                         break;
853                 }
854         }
855         if (sbuf == NULL)
856                 return -EINVAL;
857         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
858         if (ret)
859                 return ret;
860         vma->vm_flags |= VM_DONTEXPAND;
861         vma->vm_private_data = sbuf;
862         vma->vm_ops = &stk_v4l_vm_ops;
863         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
864         stk_v4l_vm_open(vma);
865         return 0;
866 }
867
868 /* v4l ioctl handlers */
869
870 static int stk_vidioc_querycap(struct file *filp,
871                 void *priv, struct v4l2_capability *cap)
872 {
873         strcpy(cap->driver, "stk");
874         strcpy(cap->card, "stk");
875         cap->version = DRIVER_VERSION_NUM;
876
877         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
878                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
879         return 0;
880 }
881
882 static int stk_vidioc_enum_input(struct file *filp,
883                 void *priv, struct v4l2_input *input)
884 {
885         if (input->index != 0)
886                 return -EINVAL;
887
888         strcpy(input->name, "Syntek USB Camera");
889         input->type = V4L2_INPUT_TYPE_CAMERA;
890         return 0;
891 }
892
893
894 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
895 {
896         *i = 0;
897         return 0;
898 }
899
900 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
901 {
902         if (i != 0)
903                 return -EINVAL;
904         else
905                 return 0;
906 }
907
908 /* from vivi.c */
909 static int stk_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
910 {
911         return 0;
912 }
913
914 /* List of all V4Lv2 controls supported by the driver */
915 static struct v4l2_queryctrl stk_controls[] = {
916         {
917                 .id      = V4L2_CID_BRIGHTNESS,
918                 .type    = V4L2_CTRL_TYPE_INTEGER,
919                 .name    = "Brightness",
920                 .minimum = 0,
921                 .maximum = 0xffff,
922                 .step    = 0x0100,
923                 .default_value = 0x6000,
924         },
925         /*TODO: get more controls to work */
926 };
927
928 static int stk_vidioc_queryctrl(struct file *filp,
929                 void *priv, struct v4l2_queryctrl *c)
930 {
931         int i;
932         int nbr;
933         nbr = ARRAY_SIZE(stk_controls);
934
935         for (i = 0; i < nbr; i++) {
936                 if (stk_controls[i].id == c->id) {
937                         memcpy(c, &stk_controls[i],
938                                 sizeof(struct v4l2_queryctrl));
939                         return 0;
940                 }
941         }
942         return -EINVAL;
943 }
944
945 static int stk_vidioc_g_ctrl(struct file *filp,
946                 void *priv, struct v4l2_control *c)
947 {
948         struct stk_camera *dev = priv;
949         switch (c->id) {
950         case V4L2_CID_BRIGHTNESS:
951                 c->value = dev->vsettings.brightness;
952                 break;
953         default:
954                 return -EINVAL;
955         }
956         return 0;
957 }
958
959 static int stk_vidioc_s_ctrl(struct file *filp,
960                 void *priv, struct v4l2_control *c)
961 {
962         struct stk_camera *dev = priv;
963         switch (c->id) {
964         case V4L2_CID_BRIGHTNESS:
965                 dev->vsettings.brightness = c->value;
966                 return stk_sensor_set_brightness(dev, c->value >> 8);
967         default:
968                 return -EINVAL;
969         }
970         return 0;
971 }
972
973
974 static int stk_vidioc_enum_fmt_cap(struct file *filp,
975                 void *priv, struct v4l2_fmtdesc *fmtd)
976 {
977         fmtd->flags = 0;
978
979         switch (fmtd->index) {
980         case 0:
981                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
982                 strcpy(fmtd->description, "r5g6b5");
983                 break;
984         case 1:
985                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
986                 strcpy(fmtd->description, "r5g6b5BE");
987                 break;
988         case 2:
989                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
990                 strcpy(fmtd->description, "yuv4:2:2");
991                 break;
992         case 3:
993                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
994                 strcpy(fmtd->description, "Raw bayer");
995                 break;
996         default:
997                 return -EINVAL;
998         }
999         return 0;
1000 }
1001
1002 static struct stk_size {
1003         unsigned w;
1004         unsigned h;
1005         enum stk_mode m;
1006 } stk_sizes[] = {
1007         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
1008         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
1009         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
1010         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
1011         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
1012 };
1013
1014 static int stk_vidioc_g_fmt_cap(struct file *filp,
1015                 void *priv, struct v4l2_format *f)
1016 {
1017         struct v4l2_pix_format *pix_format = &f->fmt.pix;
1018         struct stk_camera *dev = priv;
1019         int i;
1020
1021         for (i = 0; i < ARRAY_SIZE(stk_sizes)
1022                         && stk_sizes[i].m != dev->vsettings.mode;
1023                 i++);
1024         if (i == ARRAY_SIZE(stk_sizes)) {
1025                 STK_ERROR("ERROR: mode invalid\n");
1026                 return -EINVAL;
1027         }
1028         pix_format->width = stk_sizes[i].w;
1029         pix_format->height = stk_sizes[i].h;
1030         pix_format->field = V4L2_FIELD_NONE;
1031         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
1032         pix_format->priv = 0;
1033         pix_format->pixelformat = dev->vsettings.palette;
1034         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
1035                 pix_format->bytesperline = pix_format->width;
1036         else
1037                 pix_format->bytesperline = 2 * pix_format->width;
1038         pix_format->sizeimage = pix_format->bytesperline
1039                                 * pix_format->height;
1040         return 0;
1041 }
1042
1043 static int stk_vidioc_try_fmt_cap(struct file *filp,
1044                 void *priv, struct v4l2_format *fmtd)
1045 {
1046         int i;
1047         switch (fmtd->fmt.pix.pixelformat) {
1048         case V4L2_PIX_FMT_RGB565:
1049         case V4L2_PIX_FMT_RGB565X:
1050         case V4L2_PIX_FMT_UYVY:
1051         case V4L2_PIX_FMT_SBGGR8:
1052                 break;
1053         default:
1054                 return -EINVAL;
1055         }
1056         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
1057                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
1058                         break;
1059         }
1060         if (i == ARRAY_SIZE(stk_sizes)
1061                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
1062                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
1063                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
1064                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
1065                 fmtd->fmt.pix.priv = i - 1;
1066         } else {
1067                 fmtd->fmt.pix.height = stk_sizes[i].h;
1068                 fmtd->fmt.pix.width = stk_sizes[i].w;
1069                 fmtd->fmt.pix.priv = i;
1070         }
1071
1072         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
1073         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
1074         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
1075                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
1076         else
1077                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
1078         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
1079                 * fmtd->fmt.pix.height;
1080         return 0;
1081 }
1082
1083 static int stk_vidioc_s_fmt_cap(struct file *filp,
1084                 void *priv, struct v4l2_format *fmtd)
1085 {
1086         int ret;
1087         struct stk_camera *dev = priv;
1088
1089         if (dev == NULL)
1090                 return -ENODEV;
1091         if (!is_present(dev))
1092                 return -ENODEV;
1093         if (is_streaming(dev))
1094                 return -EBUSY;
1095         if (dev->owner && dev->owner != filp)
1096                 return -EBUSY;
1097         dev->owner = filp;
1098         ret = stk_vidioc_try_fmt_cap(filp, priv, fmtd);
1099         if (ret)
1100                 return ret;
1101
1102         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1103         stk_free_buffers(dev);
1104         dev->frame_size = fmtd->fmt.pix.sizeimage;
1105         dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;
1106
1107         stk_initialise(dev);
1108         /* This registers controls some timings, not sure of what. */
1109         stk_camera_write_reg(dev, 0x001b, 0x0e);
1110         if (dev->vsettings.mode == MODE_SXGA)
1111                 stk_camera_write_reg(dev, 0x001c, 0x0e);
1112         else
1113                 stk_camera_write_reg(dev, 0x001c, 0x46);
1114         /*
1115          * Registers 0x0115 0x0114 are the size of each line (bytes),
1116          * regs 0x0117 0x0116 are the heigth of the image.
1117          */
1118         stk_camera_write_reg(dev, 0x0115,
1119                 (fmtd->fmt.pix.bytesperline >> 8) & 0xff);
1120         stk_camera_write_reg(dev, 0x0114,
1121                 fmtd->fmt.pix.bytesperline & 0xff);
1122         stk_camera_write_reg(dev, 0x0117,
1123                 (fmtd->fmt.pix.height >> 8) & 0xff);
1124         stk_camera_write_reg(dev, 0x0116,
1125                 fmtd->fmt.pix.height & 0xff);
1126         return stk_sensor_configure(dev);
1127 }
1128
1129 static int stk_vidioc_reqbufs(struct file *filp,
1130                 void *priv, struct v4l2_requestbuffers *rb)
1131 {
1132         struct stk_camera *dev = priv;
1133
1134         if (dev == NULL)
1135                 return -ENODEV;
1136         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1137                 return -EINVAL;
1138         if (rb->memory != V4L2_MEMORY_MMAP)
1139                 return -EINVAL;
1140         if (is_streaming(dev)
1141                 || (dev->owner && dev->owner != filp))
1142                 return -EBUSY;
1143         dev->owner = filp;
1144
1145         /*FIXME If they ask for zero, we must stop streaming and free */
1146         if (rb->count < 3)
1147                 rb->count = 3;
1148         /* Arbitrary limit */
1149         else if (rb->count > 5)
1150                 rb->count = 5;
1151
1152         stk_allocate_buffers(dev, rb->count);
1153         rb->count = dev->n_sbufs;
1154         return 0;
1155 }
1156
1157 static int stk_vidioc_querybuf(struct file *filp,
1158                 void *priv, struct v4l2_buffer *buf)
1159 {
1160         int index;
1161         struct stk_camera *dev = priv;
1162         struct stk_sio_buffer *sbuf;
1163
1164         if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1165                 return -EINVAL;
1166
1167         index = buf->index;
1168
1169         if (index < 0 || index >= dev->n_sbufs)
1170                 return -EINVAL;
1171         sbuf = dev->sio_bufs + buf->index;
1172         *buf = sbuf->v4lbuf;
1173         return 0;
1174 }
1175
1176 static int stk_vidioc_qbuf(struct file *filp,
1177                 void *priv, struct v4l2_buffer *buf)
1178 {
1179         struct stk_camera *dev = priv;
1180         struct stk_sio_buffer *sbuf;
1181         unsigned long flags;
1182         if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1183                 return -EINVAL;
1184
1185         if (buf->memory != V4L2_MEMORY_MMAP)
1186                 return -EINVAL;
1187
1188         if (buf->index < 0 || buf->index >= dev->n_sbufs)
1189                 return -EINVAL;
1190         sbuf = dev->sio_bufs + buf->index;
1191         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1192                 return 0;
1193         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1194         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1195         spin_lock_irqsave(&dev->spinlock, flags);
1196         list_add_tail(&sbuf->list, &dev->sio_avail);
1197         *buf = sbuf->v4lbuf;
1198         spin_unlock_irqrestore(&dev->spinlock, flags);
1199         return 0;
1200 }
1201
1202 static int stk_vidioc_dqbuf(struct file *filp,
1203                 void *priv, struct v4l2_buffer *buf)
1204 {
1205         struct stk_camera *dev = priv;
1206         struct stk_sio_buffer *sbuf;
1207         unsigned long flags;
1208         int ret;
1209
1210         if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1211                 || !is_streaming(dev))
1212                 return -EINVAL;
1213
1214         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1215                 return -EWOULDBLOCK;
1216         ret = wait_event_interruptible(dev->wait_frame,
1217                 !list_empty(&dev->sio_full) || !is_present(dev));
1218         if (ret)
1219                 return ret;
1220         if (!is_present(dev))
1221                 return -EIO;
1222
1223         spin_lock_irqsave(&dev->spinlock, flags);
1224         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1225         list_del_init(&sbuf->list);
1226         spin_unlock_irqrestore(&dev->spinlock, flags);
1227         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1228         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1229         sbuf->v4lbuf.sequence = ++dev->sequence;
1230         do_gettimeofday(&sbuf->v4lbuf.timestamp);
1231
1232         *buf = sbuf->v4lbuf;
1233         return 0;
1234 }
1235
1236 static int stk_vidioc_streamon(struct file *filp,
1237                 void *priv, enum v4l2_buf_type type)
1238 {
1239         struct stk_camera *dev = priv;
1240         if (is_streaming(dev))
1241                 return 0;
1242         if (dev->sio_bufs == NULL)
1243                 return -EINVAL;
1244         dev->sequence = 0;
1245         return stk_start_stream(dev);
1246 }
1247
1248 static int stk_vidioc_streamoff(struct file *filp,
1249                 void *priv, enum v4l2_buf_type type)
1250 {
1251         struct stk_camera *dev = priv;
1252         unsigned long flags;
1253         int i;
1254         stk_stop_stream(dev);
1255         spin_lock_irqsave(&dev->spinlock, flags);
1256         INIT_LIST_HEAD(&dev->sio_avail);
1257         INIT_LIST_HEAD(&dev->sio_full);
1258         for (i = 0; i < dev->n_sbufs; i++) {
1259                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1260                 dev->sio_bufs[i].v4lbuf.flags = 0;
1261         }
1262         spin_unlock_irqrestore(&dev->spinlock, flags);
1263         return 0;
1264 }
1265
1266
1267 static int stk_vidioc_g_parm(struct file *filp,
1268                 void *priv, struct v4l2_streamparm *sp)
1269 {
1270         if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1271                 return -EINVAL;
1272
1273         sp->parm.capture.capability = 0;
1274         sp->parm.capture.capturemode = 0;
1275         /*FIXME This is not correct */
1276         sp->parm.capture.timeperframe.numerator = 1;
1277         sp->parm.capture.timeperframe.denominator = 30;
1278         sp->parm.capture.readbuffers = 2;
1279         sp->parm.capture.extendedmode = 0;
1280         return 0;
1281 }
1282
1283 static struct file_operations v4l_stk_fops = {
1284         .owner = THIS_MODULE,
1285         .open = v4l_stk_open,
1286         .release = v4l_stk_release,
1287         .read = v4l_stk_read,
1288         .poll = v4l_stk_poll,
1289         .mmap = v4l_stk_mmap,
1290         .ioctl = video_ioctl2,
1291         .llseek = no_llseek
1292 };
1293
1294 static void stk_v4l_dev_release(struct video_device *vd)
1295 {
1296 }
1297
1298 static struct video_device stk_v4l_data = {
1299         .name = "stkwebcam",
1300         .type = VFL_TYPE_GRABBER,
1301         .type2 = VID_TYPE_CAPTURE,
1302         .minor = -1,
1303         .tvnorms = V4L2_STD_UNKNOWN,
1304         .current_norm = V4L2_STD_UNKNOWN,
1305         .fops = &v4l_stk_fops,
1306         .release = stk_v4l_dev_release,
1307
1308         .vidioc_querycap = stk_vidioc_querycap,
1309         .vidioc_enum_fmt_cap = stk_vidioc_enum_fmt_cap,
1310         .vidioc_try_fmt_cap = stk_vidioc_try_fmt_cap,
1311         .vidioc_s_fmt_cap = stk_vidioc_s_fmt_cap,
1312         .vidioc_g_fmt_cap = stk_vidioc_g_fmt_cap,
1313         .vidioc_enum_input = stk_vidioc_enum_input,
1314         .vidioc_s_input = stk_vidioc_s_input,
1315         .vidioc_g_input = stk_vidioc_g_input,
1316         .vidioc_s_std = stk_vidioc_s_std,
1317         .vidioc_reqbufs = stk_vidioc_reqbufs,
1318         .vidioc_querybuf = stk_vidioc_querybuf,
1319         .vidioc_qbuf = stk_vidioc_qbuf,
1320         .vidioc_dqbuf = stk_vidioc_dqbuf,
1321         .vidioc_streamon = stk_vidioc_streamon,
1322         .vidioc_streamoff = stk_vidioc_streamoff,
1323         .vidioc_queryctrl = stk_vidioc_queryctrl,
1324         .vidioc_g_ctrl = stk_vidioc_g_ctrl,
1325         .vidioc_s_ctrl = stk_vidioc_s_ctrl,
1326         .vidioc_g_parm = stk_vidioc_g_parm,
1327 };
1328
1329
1330 static int stk_register_video_device(struct stk_camera *dev)
1331 {
1332         int err;
1333
1334         dev->vdev = stk_v4l_data;
1335         dev->vdev.debug = debug;
1336         dev->vdev.dev = &dev->interface->dev;
1337         dev->vdev.priv = dev;
1338         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1339         if (err)
1340                 STK_ERROR("v4l registration failed\n");
1341         else
1342                 STK_INFO("Syntek USB2.0 Camera is now controlling video device"
1343                         " /dev/video%d\n", dev->vdev.minor);
1344         return err;
1345 }
1346
1347
1348 /* USB Stuff */
1349
1350 static int stk_camera_probe(struct usb_interface *interface,
1351                 const struct usb_device_id *id)
1352 {
1353         int i;
1354         int err;
1355
1356         struct stk_camera *dev = NULL;
1357         struct usb_device *udev = interface_to_usbdev(interface);
1358         struct usb_host_interface *iface_desc;
1359         struct usb_endpoint_descriptor *endpoint;
1360
1361         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1362         if (dev == NULL) {
1363                 STK_ERROR("Out of memory !\n");
1364                 return -ENOMEM;
1365         }
1366
1367         kref_init(&dev->kref);
1368         spin_lock_init(&dev->spinlock);
1369         init_waitqueue_head(&dev->wait_frame);
1370
1371         dev->udev = udev;
1372         dev->interface = interface;
1373         usb_get_intf(interface);
1374
1375         dev->vsettings.vflip = vflip;
1376         dev->vsettings.hflip = hflip;
1377         dev->n_sbufs = 0;
1378         set_present(dev);
1379
1380         /* Set up the endpoint information
1381          * use only the first isoc-in endpoint
1382          * for the current alternate setting */
1383         iface_desc = interface->cur_altsetting;
1384
1385         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1386                 endpoint = &iface_desc->endpoint[i].desc;
1387
1388                 if (!dev->isoc_ep
1389                         && ((endpoint->bEndpointAddress
1390                                 & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1391                         && ((endpoint->bmAttributes
1392                                 & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_ISOC)) {
1393                         /* we found an isoc in endpoint */
1394                         dev->isoc_ep = (endpoint->bEndpointAddress & 0xF);
1395                         break;
1396                 }
1397         }
1398         if (!dev->isoc_ep) {
1399                 STK_ERROR("Could not find isoc-in endpoint");
1400                 kref_put(&dev->kref, stk_camera_cleanup);
1401                 return -ENODEV;
1402         }
1403         dev->vsettings.brightness = 0x7fff;
1404         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1405         dev->vsettings.mode = MODE_VGA;
1406         dev->frame_size = 640*480*2;
1407
1408         INIT_LIST_HEAD(&dev->sio_avail);
1409         INIT_LIST_HEAD(&dev->sio_full);
1410
1411         usb_set_intfdata(interface, dev);
1412
1413         err = stk_register_video_device(dev);
1414         if (err) {
1415                 kref_put(&dev->kref, stk_camera_cleanup);
1416                 return err;
1417         }
1418
1419         stk_create_sysfs_files(&dev->vdev);
1420
1421         return 0;
1422 }
1423
1424 static void stk_camera_disconnect(struct usb_interface *interface)
1425 {
1426         struct stk_camera *dev = usb_get_intfdata(interface);
1427
1428         usb_set_intfdata(interface, NULL);
1429         unset_present(dev);
1430
1431         wake_up_interruptible(&dev->wait_frame);
1432         stk_remove_sysfs_files(&dev->vdev);
1433
1434         kref_put(&dev->kref, stk_camera_cleanup);
1435 }
1436
1437 static struct usb_driver stk_camera_driver = {
1438         .name = "stkwebcam",
1439         .probe = stk_camera_probe,
1440         .disconnect = stk_camera_disconnect,
1441         .id_table = stkwebcam_table,
1442 };
1443
1444
1445 static int __init stk_camera_init(void)
1446 {
1447         int result;
1448
1449         result = usb_register(&stk_camera_driver);
1450         if (result)
1451                 STK_ERROR("usb_register failed ! Error number %d\n", result);
1452
1453
1454         return result;
1455 }
1456
1457 static void __exit stk_camera_exit(void)
1458 {
1459         usb_deregister(&stk_camera_driver);
1460 }
1461
1462 module_init(stk_camera_init);
1463 module_exit(stk_camera_exit);
1464
1465