Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

Linux/drivers/media/usb/stkwebcam/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 
 31 #include <linux/dmi.h>
 32 #include <linux/usb.h>
 33 #include <linux/mm.h>
 34 #include <linux/vmalloc.h>
 35 #include <linux/videodev2.h>
 36 #include <media/v4l2-common.h>
 37 #include <media/v4l2-ioctl.h>
 38 #include <media/v4l2-event.h>
 39 
 40 #include "stk-webcam.h"
 41 
 42 
 43 static int hflip = -1;
 44 module_param(hflip, int, 0444);
 45 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 0");
 46 
 47 static int vflip = -1;
 48 module_param(vflip, int, 0444);
 49 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 0");
 50 
 51 static int debug;
 52 module_param(debug, int, 0444);
 53 MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
 54 
 55 MODULE_LICENSE("GPL");
 56 MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
 57 MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
 58 
 59 /* Some cameras have audio interfaces, we aren't interested in those */
 60 static struct usb_device_id stkwebcam_table[] = {
 61         { USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
 62         { USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
 63         { }
 64 };
 65 MODULE_DEVICE_TABLE(usb, stkwebcam_table);
 66 
 67 /*
 68  * The stk webcam laptop module is mounted upside down in some laptops :(
 69  *
 70  * Some background information (thanks to Hans de Goede for providing this):
 71  *
 72  * 1) Once upon a time the stkwebcam driver was written
 73  *
 74  * 2) The webcam in question was used mostly in Asus laptop models, including
 75  * the laptop of the original author of the driver, and in these models, in
 76  * typical Asus fashion (see the long long list for uvc cams inside v4l-utils),
 77  * they mounted the webcam-module the wrong way up. So the hflip and vflip
 78  * module options were given a default value of 1 (the correct value for
 79  * upside down mounted models)
 80  *
 81  * 3) Years later I got a bug report from a user with a laptop with stkwebcam,
 82  * where the module was actually mounted the right way up, and thus showed
 83  * upside down under Linux. So now I was facing the choice of 2 options:
 84  *
 85  * a) Add a not-upside-down list to stkwebcam, which overrules the default.
 86  *
 87  * b) Do it like all the other drivers do, and make the default right for
 88  *    cams mounted the proper way and add an upside-down model list, with
 89  *    models where we need to flip-by-default.
 90  *
 91  * Despite knowing that going b) would cause a period of pain where we were
 92  * building the table I opted to go for option b), since a) is just too ugly,
 93  * and worse different from how every other driver does it leading to
 94  * confusion in the long run. This change was made in kernel 3.6.
 95  *
 96  * So for any user report about upside-down images since kernel 3.6 ask them
 97  * to provide the output of 'sudo dmidecode' so the laptop can be added in
 98  * the table below.
 99  */
100 static const struct dmi_system_id stk_upside_down_dmi_table[] = {
101         {
102                 .ident = "ASUS G1",
103                 .matches = {
104                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
105                         DMI_MATCH(DMI_PRODUCT_NAME, "G1")
106                 }
107         }, {
108                 .ident = "ASUS F3JC",
109                 .matches = {
110                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
111                         DMI_MATCH(DMI_PRODUCT_NAME, "F3JC")
112                 }
113         },
114         {
115                 .ident = "T12Rg-H",
116                 .matches = {
117                         DMI_MATCH(DMI_SYS_VENDOR, "HCL Infosystems Limited"),
118                         DMI_MATCH(DMI_PRODUCT_NAME, "T12Rg-H")
119                 }
120         },
121         {}
122 };
123 
124 
125 /*
126  * Basic stuff
127  */
128 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
129 {
130         struct usb_device *udev = dev->udev;
131         int ret;
132 
133         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
134                         0x01,
135                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
136                         value,
137                         index,
138                         NULL,
139                         0,
140                         500);
141         if (ret < 0)
142                 return ret;
143         else
144                 return 0;
145 }
146 
147 int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
148 {
149         struct usb_device *udev = dev->udev;
150         unsigned char *buf;
151         int ret;
152 
153         buf = kmalloc(sizeof(u8), GFP_KERNEL);
154         if (!buf)
155                 return -ENOMEM;
156 
157         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
158                         0x00,
159                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
160                         0x00,
161                         index,
162                         buf,
163                         sizeof(u8),
164                         500);
165         if (ret >= 0)
166                 memcpy(value, buf, sizeof(u8));
167 
168         kfree(buf);
169         return ret;
170 }
171 
172 static int stk_start_stream(struct stk_camera *dev)
173 {
174         int value;
175         int i, ret;
176         int value_116, value_117;
177 
178         if (!is_present(dev))
179                 return -ENODEV;
180         if (!is_memallocd(dev) || !is_initialised(dev)) {
181                 STK_ERROR("FIXME: Buffers are not allocated\n");
182                 return -EFAULT;
183         }
184         ret = usb_set_interface(dev->udev, 0, 5);
185 
186         if (ret < 0)
187                 STK_ERROR("usb_set_interface failed !\n");
188         if (stk_sensor_wakeup(dev))
189                 STK_ERROR("error awaking the sensor\n");
190 
191         stk_camera_read_reg(dev, 0x0116, &value_116);
192         stk_camera_read_reg(dev, 0x0117, &value_117);
193 
194         stk_camera_write_reg(dev, 0x0116, 0x0000);
195         stk_camera_write_reg(dev, 0x0117, 0x0000);
196 
197         stk_camera_read_reg(dev, 0x0100, &value);
198         stk_camera_write_reg(dev, 0x0100, value | 0x80);
199 
200         stk_camera_write_reg(dev, 0x0116, value_116);
201         stk_camera_write_reg(dev, 0x0117, value_117);
202         for (i = 0; i < MAX_ISO_BUFS; i++) {
203                 if (dev->isobufs[i].urb) {
204                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
205                         atomic_inc(&dev->urbs_used);
206                         if (ret)
207                                 return ret;
208                 }
209         }
210         set_streaming(dev);
211         return 0;
212 }
213 
214 static int stk_stop_stream(struct stk_camera *dev)
215 {
216         int value;
217         int i;
218         if (is_present(dev)) {
219                 stk_camera_read_reg(dev, 0x0100, &value);
220                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
221                 if (dev->isobufs != NULL) {
222                         for (i = 0; i < MAX_ISO_BUFS; i++) {
223                                 if (dev->isobufs[i].urb)
224                                         usb_kill_urb(dev->isobufs[i].urb);
225                         }
226                 }
227                 unset_streaming(dev);
228 
229                 if (usb_set_interface(dev->udev, 0, 0))
230                         STK_ERROR("usb_set_interface failed !\n");
231                 if (stk_sensor_sleep(dev))
232                         STK_ERROR("error suspending the sensor\n");
233         }
234         return 0;
235 }
236 
237 /*
238  * This seems to be the shortest init sequence we
239  * must do in order to find the sensor
240  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
241  * is also reset. Maybe powers down it?
242  * Rest of values don't make a difference
243  */
244 
245 static struct regval stk1125_initvals[] = {
246         /*TODO: What means this sequence? */
247         {0x0000, 0x24},
248         {0x0100, 0x21},
249         {0x0002, 0x68},
250         {0x0003, 0x80},
251         {0x0005, 0x00},
252         {0x0007, 0x03},
253         {0x000d, 0x00},
254         {0x000f, 0x02},
255         {0x0300, 0x12},
256         {0x0350, 0x41},
257         {0x0351, 0x00},
258         {0x0352, 0x00},
259         {0x0353, 0x00},
260         {0x0018, 0x10},
261         {0x0019, 0x00},
262         {0x001b, 0x0e},
263         {0x001c, 0x46},
264         {0x0300, 0x80},
265         {0x001a, 0x04},
266         {0x0110, 0x00},
267         {0x0111, 0x00},
268         {0x0112, 0x00},
269         {0x0113, 0x00},
270 
271         {0xffff, 0xff},
272 };
273 
274 
275 static int stk_initialise(struct stk_camera *dev)
276 {
277         struct regval *rv;
278         int ret;
279         if (!is_present(dev))
280                 return -ENODEV;
281         if (is_initialised(dev))
282                 return 0;
283         rv = stk1125_initvals;
284         while (rv->reg != 0xffff) {
285                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
286                 if (ret)
287                         return ret;
288                 rv++;
289         }
290         if (stk_sensor_init(dev) == 0) {
291                 set_initialised(dev);
292                 return 0;
293         } else
294                 return -1;
295 }
296 
297 /* *********************************************** */
298 /*
299  * This function is called as an URB transfert is complete (Isochronous pipe).
300  * So, the traitement is done in interrupt time, so it has be fast, not crash,
301  * and not stall. Neat.
302  */
303 static void stk_isoc_handler(struct urb *urb)
304 {
305         int i;
306         int ret;
307         int framelen;
308         unsigned long flags;
309 
310         unsigned char *fill = NULL;
311         unsigned char *iso_buf = NULL;
312 
313         struct stk_camera *dev;
314         struct stk_sio_buffer *fb;
315 
316         dev = (struct stk_camera *) urb->context;
317 
318         if (dev == NULL) {
319                 STK_ERROR("isoc_handler called with NULL device !\n");
320                 return;
321         }
322 
323         if (urb->status == -ENOENT || urb->status == -ECONNRESET
324                 || urb->status == -ESHUTDOWN) {
325                 atomic_dec(&dev->urbs_used);
326                 return;
327         }
328 
329         spin_lock_irqsave(&dev->spinlock, flags);
330 
331         if (urb->status != -EINPROGRESS && urb->status != 0) {
332                 STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
333                 goto resubmit;
334         }
335 
336         if (list_empty(&dev->sio_avail)) {
337                 /*FIXME Stop streaming after a while */
338                 (void) (printk_ratelimit() &&
339                 STK_ERROR("isoc_handler without available buffer!\n"));
340                 goto resubmit;
341         }
342         fb = list_first_entry(&dev->sio_avail,
343                         struct stk_sio_buffer, list);
344         fill = fb->buffer + fb->v4lbuf.bytesused;
345 
346         for (i = 0; i < urb->number_of_packets; i++) {
347                 if (urb->iso_frame_desc[i].status != 0) {
348                         if (urb->iso_frame_desc[i].status != -EXDEV)
349                                 STK_ERROR("Frame %d has error %d\n", i,
350                                         urb->iso_frame_desc[i].status);
351                         continue;
352                 }
353                 framelen = urb->iso_frame_desc[i].actual_length;
354                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
355 
356                 if (framelen <= 4)
357                         continue; /* no data */
358 
359                 /*
360                  * we found something informational from there
361                  * the isoc frames have to type of headers
362                  * type1: 00 xx 00 00 or 20 xx 00 00
363                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
364                  * xx is a sequencer which has never been seen over 0x3f
365                  * imho data written down looks like bayer, i see similarities
366                  * after every 640 bytes
367                  */
368                 if (*iso_buf & 0x80) {
369                         framelen -= 8;
370                         iso_buf += 8;
371                         /* This marks a new frame */
372                         if (fb->v4lbuf.bytesused != 0
373                                 && fb->v4lbuf.bytesused != dev->frame_size) {
374                                 (void) (printk_ratelimit() &&
375                                 STK_ERROR("frame %d, "
376                                         "bytesused=%d, skipping\n",
377                                         i, fb->v4lbuf.bytesused));
378                                 fb->v4lbuf.bytesused = 0;
379                                 fill = fb->buffer;
380                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
381                                 if (list_is_singular(&dev->sio_avail)) {
382                                         /* Always reuse the last buffer */
383                                         fb->v4lbuf.bytesused = 0;
384                                         fill = fb->buffer;
385                                 } else {
386                                         list_move_tail(dev->sio_avail.next,
387                                                 &dev->sio_full);
388                                         wake_up(&dev->wait_frame);
389                                         fb = list_first_entry(&dev->sio_avail,
390                                                 struct stk_sio_buffer, list);
391                                         fb->v4lbuf.bytesused = 0;
392                                         fill = fb->buffer;
393                                 }
394                         }
395                 } else {
396                         framelen -= 4;
397                         iso_buf += 4;
398                 }
399 
400                 /* Our buffer is full !!! */
401                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
402                         (void) (printk_ratelimit() &&
403                         STK_ERROR("Frame buffer overflow, lost sync\n"));
404                         /*FIXME Do something here? */
405                         continue;
406                 }
407                 spin_unlock_irqrestore(&dev->spinlock, flags);
408                 memcpy(fill, iso_buf, framelen);
409                 spin_lock_irqsave(&dev->spinlock, flags);
410                 fill += framelen;
411 
412                 /* New size of our buffer */
413                 fb->v4lbuf.bytesused += framelen;
414         }
415 
416 resubmit:
417         spin_unlock_irqrestore(&dev->spinlock, flags);
418         urb->dev = dev->udev;
419         ret = usb_submit_urb(urb, GFP_ATOMIC);
420         if (ret != 0) {
421                 STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
422                         ret);
423         }
424 }
425 
426 /* -------------------------------------------- */
427 
428 static int stk_prepare_iso(struct stk_camera *dev)
429 {
430         void *kbuf;
431         int i, j;
432         struct urb *urb;
433         struct usb_device *udev;
434 
435         if (dev == NULL)
436                 return -ENXIO;
437         udev = dev->udev;
438 
439         if (dev->isobufs)
440                 STK_ERROR("isobufs already allocated. Bad\n");
441         else
442                 dev->isobufs = kcalloc(MAX_ISO_BUFS, sizeof(*dev->isobufs),
443                                        GFP_KERNEL);
444         if (dev->isobufs == NULL) {
445                 STK_ERROR("Unable to allocate iso buffers\n");
446                 return -ENOMEM;
447         }
448         for (i = 0; i < MAX_ISO_BUFS; i++) {
449                 if (dev->isobufs[i].data == NULL) {
450                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
451                         if (kbuf == NULL) {
452                                 STK_ERROR("Failed to allocate iso buffer %d\n",
453                                         i);
454                                 goto isobufs_out;
455                         }
456                         dev->isobufs[i].data = kbuf;
457                 } else
458                         STK_ERROR("isobuf data already allocated\n");
459                 if (dev->isobufs[i].urb == NULL) {
460                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
461                         if (urb == NULL)
462                                 goto isobufs_out;
463                         dev->isobufs[i].urb = urb;
464                 } else {
465                         STK_ERROR("Killing URB\n");
466                         usb_kill_urb(dev->isobufs[i].urb);
467                         urb = dev->isobufs[i].urb;
468                 }
469                 urb->interval = 1;
470                 urb->dev = udev;
471                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
472                 urb->transfer_flags = URB_ISO_ASAP;
473                 urb->transfer_buffer = dev->isobufs[i].data;
474                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
475                 urb->complete = stk_isoc_handler;
476                 urb->context = dev;
477                 urb->start_frame = 0;
478                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
479 
480                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
481                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
482                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
483                 }
484         }
485         set_memallocd(dev);
486         return 0;
487 
488 isobufs_out:
489         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
490                 kfree(dev->isobufs[i].data);
491         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
492                 usb_free_urb(dev->isobufs[i].urb);
493         kfree(dev->isobufs);
494         dev->isobufs = NULL;
495         return -ENOMEM;
496 }
497 
498 static void stk_clean_iso(struct stk_camera *dev)
499 {
500         int i;
501 
502         if (dev == NULL || dev->isobufs == NULL)
503                 return;
504 
505         for (i = 0; i < MAX_ISO_BUFS; i++) {
506                 struct urb *urb;
507 
508                 urb = dev->isobufs[i].urb;
509                 if (urb) {
510                         if (atomic_read(&dev->urbs_used) && is_present(dev))
511                                 usb_kill_urb(urb);
512                         usb_free_urb(urb);
513                 }
514                 kfree(dev->isobufs[i].data);
515         }
516         kfree(dev->isobufs);
517         dev->isobufs = NULL;
518         unset_memallocd(dev);
519 }
520 
521 static int stk_setup_siobuf(struct stk_camera *dev, int index)
522 {
523         struct stk_sio_buffer *buf = dev->sio_bufs + index;
524         INIT_LIST_HEAD(&buf->list);
525         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
526         buf->buffer = vmalloc_user(buf->v4lbuf.length);
527         if (buf->buffer == NULL)
528                 return -ENOMEM;
529         buf->mapcount = 0;
530         buf->dev = dev;
531         buf->v4lbuf.index = index;
532         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
533         buf->v4lbuf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
534         buf->v4lbuf.field = V4L2_FIELD_NONE;
535         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
536         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
537         return 0;
538 }
539 
540 static int stk_free_sio_buffers(struct stk_camera *dev)
541 {
542         int i;
543         int nbufs;
544         unsigned long flags;
545         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
546                 return 0;
547         /*
548         * If any buffers are mapped, we cannot free them at all.
549         */
550         for (i = 0; i < dev->n_sbufs; i++) {
551                 if (dev->sio_bufs[i].mapcount > 0)
552                         return -EBUSY;
553         }
554         /*
555         * OK, let's do it.
556         */
557         spin_lock_irqsave(&dev->spinlock, flags);
558         INIT_LIST_HEAD(&dev->sio_avail);
559         INIT_LIST_HEAD(&dev->sio_full);
560         nbufs = dev->n_sbufs;
561         dev->n_sbufs = 0;
562         spin_unlock_irqrestore(&dev->spinlock, flags);
563         for (i = 0; i < nbufs; i++)
564                 vfree(dev->sio_bufs[i].buffer);
565         kfree(dev->sio_bufs);
566         dev->sio_bufs = NULL;
567         return 0;
568 }
569 
570 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
571 {
572         int i;
573         if (dev->sio_bufs != NULL)
574                 STK_ERROR("sio_bufs already allocated\n");
575         else {
576                 dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
577                                 GFP_KERNEL);
578                 if (dev->sio_bufs == NULL)
579                         return -ENOMEM;
580                 for (i = 0; i < n_sbufs; i++) {
581                         if (stk_setup_siobuf(dev, i))
582                                 return (dev->n_sbufs > 1 ? 0 : -ENOMEM);
583                         dev->n_sbufs = i+1;
584                 }
585         }
586         return 0;
587 }
588 
589 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
590 {
591         int err;
592         err = stk_prepare_iso(dev);
593         if (err) {
594                 stk_clean_iso(dev);
595                 return err;
596         }
597         err = stk_prepare_sio_buffers(dev, n_sbufs);
598         if (err) {
599                 stk_free_sio_buffers(dev);
600                 return err;
601         }
602         return 0;
603 }
604 
605 static void stk_free_buffers(struct stk_camera *dev)
606 {
607         stk_clean_iso(dev);
608         stk_free_sio_buffers(dev);
609 }
610 /* -------------------------------------------- */
611 
612 /* v4l file operations */
613 
614 static int v4l_stk_open(struct file *fp)
615 {
616         struct stk_camera *dev = video_drvdata(fp);
617         int err;
618 
619         if (dev == NULL || !is_present(dev))
620                 return -ENXIO;
621 
622         if (mutex_lock_interruptible(&dev->lock))
623                 return -ERESTARTSYS;
624         if (!dev->first_init)
625                 stk_camera_write_reg(dev, 0x0, 0x24);
626         else
627                 dev->first_init = 0;
628 
629         err = v4l2_fh_open(fp);
630         if (!err)
631                 usb_autopm_get_interface(dev->interface);
632         mutex_unlock(&dev->lock);
633         return err;
634 }
635 
636 static int v4l_stk_release(struct file *fp)
637 {
638         struct stk_camera *dev = video_drvdata(fp);
639 
640         mutex_lock(&dev->lock);
641         if (dev->owner == fp) {
642                 stk_stop_stream(dev);
643                 stk_free_buffers(dev);
644                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
645                 unset_initialised(dev);
646                 dev->owner = NULL;
647         }
648 
649         if (is_present(dev))
650                 usb_autopm_put_interface(dev->interface);
651         mutex_unlock(&dev->lock);
652         return v4l2_fh_release(fp);
653 }
654 
655 static ssize_t stk_read(struct file *fp, char __user *buf,
656                 size_t count, loff_t *f_pos)
657 {
658         int i;
659         int ret;
660         unsigned long flags;
661         struct stk_sio_buffer *sbuf;
662         struct stk_camera *dev = video_drvdata(fp);
663 
664         if (!is_present(dev))
665                 return -EIO;
666         if (dev->owner && (!dev->reading || dev->owner != fp))
667                 return -EBUSY;
668         dev->owner = fp;
669         if (!is_streaming(dev)) {
670                 if (stk_initialise(dev)
671                         || stk_allocate_buffers(dev, 3)
672                         || stk_start_stream(dev))
673                         return -ENOMEM;
674                 dev->reading = 1;
675                 spin_lock_irqsave(&dev->spinlock, flags);
676                 for (i = 0; i < dev->n_sbufs; i++) {
677                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
678                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
679                 }
680                 spin_unlock_irqrestore(&dev->spinlock, flags);
681         }
682         if (*f_pos == 0) {
683                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
684                         return -EWOULDBLOCK;
685                 ret = wait_event_interruptible(dev->wait_frame,
686                         !list_empty(&dev->sio_full) || !is_present(dev));
687                 if (ret)
688                         return ret;
689                 if (!is_present(dev))
690                         return -EIO;
691         }
692         if (count + *f_pos > dev->frame_size)
693                 count = dev->frame_size - *f_pos;
694         spin_lock_irqsave(&dev->spinlock, flags);
695         if (list_empty(&dev->sio_full)) {
696                 spin_unlock_irqrestore(&dev->spinlock, flags);
697                 STK_ERROR("BUG: No siobufs ready\n");
698                 return 0;
699         }
700         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
701         spin_unlock_irqrestore(&dev->spinlock, flags);
702 
703         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
704                 return -EFAULT;
705 
706         *f_pos += count;
707 
708         if (*f_pos >= dev->frame_size) {
709                 *f_pos = 0;
710                 spin_lock_irqsave(&dev->spinlock, flags);
711                 list_move_tail(&sbuf->list, &dev->sio_avail);
712                 spin_unlock_irqrestore(&dev->spinlock, flags);
713         }
714         return count;
715 }
716 
717 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
718                 size_t count, loff_t *f_pos)
719 {
720         struct stk_camera *dev = video_drvdata(fp);
721         int ret;
722 
723         if (mutex_lock_interruptible(&dev->lock))
724                 return -ERESTARTSYS;
725         ret = stk_read(fp, buf, count, f_pos);
726         mutex_unlock(&dev->lock);
727         return ret;
728 }
729 
730 static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
731 {
732         struct stk_camera *dev = video_drvdata(fp);
733         unsigned res = v4l2_ctrl_poll(fp, wait);
734 
735         poll_wait(fp, &dev->wait_frame, wait);
736 
737         if (!is_present(dev))
738                 return POLLERR;
739 
740         if (!list_empty(&dev->sio_full))
741                 return res | POLLIN | POLLRDNORM;
742 
743         return res;
744 }
745 
746 
747 static void stk_v4l_vm_open(struct vm_area_struct *vma)
748 {
749         struct stk_sio_buffer *sbuf = vma->vm_private_data;
750         sbuf->mapcount++;
751 }
752 static void stk_v4l_vm_close(struct vm_area_struct *vma)
753 {
754         struct stk_sio_buffer *sbuf = vma->vm_private_data;
755         sbuf->mapcount--;
756         if (sbuf->mapcount == 0)
757                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
758 }
759 static const struct vm_operations_struct stk_v4l_vm_ops = {
760         .open = stk_v4l_vm_open,
761         .close = stk_v4l_vm_close
762 };
763 
764 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
765 {
766         unsigned int i;
767         int ret;
768         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
769         struct stk_camera *dev = video_drvdata(fp);
770         struct stk_sio_buffer *sbuf = NULL;
771 
772         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
773                 return -EINVAL;
774 
775         for (i = 0; i < dev->n_sbufs; i++) {
776                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
777                         sbuf = dev->sio_bufs + i;
778                         break;
779                 }
780         }
781         if (sbuf == NULL)
782                 return -EINVAL;
783         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
784         if (ret)
785                 return ret;
786         vma->vm_flags |= VM_DONTEXPAND;
787         vma->vm_private_data = sbuf;
788         vma->vm_ops = &stk_v4l_vm_ops;
789         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
790         stk_v4l_vm_open(vma);
791         return 0;
792 }
793 
794 /* v4l ioctl handlers */
795 
796 static int stk_vidioc_querycap(struct file *filp,
797                 void *priv, struct v4l2_capability *cap)
798 {
799         struct stk_camera *dev = video_drvdata(filp);
800 
801         strcpy(cap->driver, "stk");
802         strcpy(cap->card, "stk");
803         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
804 
805         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
806                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
807         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
808         return 0;
809 }
810 
811 static int stk_vidioc_enum_input(struct file *filp,
812                 void *priv, struct v4l2_input *input)
813 {
814         if (input->index != 0)
815                 return -EINVAL;
816 
817         strcpy(input->name, "Syntek USB Camera");
818         input->type = V4L2_INPUT_TYPE_CAMERA;
819         return 0;
820 }
821 
822 
823 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
824 {
825         *i = 0;
826         return 0;
827 }
828 
829 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
830 {
831         return i ? -EINVAL : 0;
832 }
833 
834 static int stk_s_ctrl(struct v4l2_ctrl *ctrl)
835 {
836         struct stk_camera *dev =
837                 container_of(ctrl->handler, struct stk_camera, hdl);
838 
839         switch (ctrl->id) {
840         case V4L2_CID_BRIGHTNESS:
841                 return stk_sensor_set_brightness(dev, ctrl->val);
842         case V4L2_CID_HFLIP:
843                 if (dmi_check_system(stk_upside_down_dmi_table))
844                         dev->vsettings.hflip = !ctrl->val;
845                 else
846                         dev->vsettings.hflip = ctrl->val;
847                 return 0;
848         case V4L2_CID_VFLIP:
849                 if (dmi_check_system(stk_upside_down_dmi_table))
850                         dev->vsettings.vflip = !ctrl->val;
851                 else
852                         dev->vsettings.vflip = ctrl->val;
853                 return 0;
854         default:
855                 return -EINVAL;
856         }
857         return 0;
858 }
859 
860 
861 static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
862                 void *priv, struct v4l2_fmtdesc *fmtd)
863 {
864         switch (fmtd->index) {
865         case 0:
866                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
867                 strcpy(fmtd->description, "r5g6b5");
868                 break;
869         case 1:
870                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
871                 strcpy(fmtd->description, "r5g6b5BE");
872                 break;
873         case 2:
874                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
875                 strcpy(fmtd->description, "yuv4:2:2");
876                 break;
877         case 3:
878                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
879                 strcpy(fmtd->description, "Raw bayer");
880                 break;
881         case 4:
882                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
883                 strcpy(fmtd->description, "yuv4:2:2");
884                 break;
885         default:
886                 return -EINVAL;
887         }
888         return 0;
889 }
890 
891 static struct stk_size {
892         unsigned w;
893         unsigned h;
894         enum stk_mode m;
895 } stk_sizes[] = {
896         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
897         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
898         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
899         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
900         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
901 };
902 
903 static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
904                 void *priv, struct v4l2_format *f)
905 {
906         struct v4l2_pix_format *pix_format = &f->fmt.pix;
907         struct stk_camera *dev = video_drvdata(filp);
908         int i;
909 
910         for (i = 0; i < ARRAY_SIZE(stk_sizes) &&
911                         stk_sizes[i].m != dev->vsettings.mode; i++)
912                 ;
913         if (i == ARRAY_SIZE(stk_sizes)) {
914                 STK_ERROR("ERROR: mode invalid\n");
915                 return -EINVAL;
916         }
917         pix_format->width = stk_sizes[i].w;
918         pix_format->height = stk_sizes[i].h;
919         pix_format->field = V4L2_FIELD_NONE;
920         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
921         pix_format->pixelformat = dev->vsettings.palette;
922         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
923                 pix_format->bytesperline = pix_format->width;
924         else
925                 pix_format->bytesperline = 2 * pix_format->width;
926         pix_format->sizeimage = pix_format->bytesperline
927                                 * pix_format->height;
928         return 0;
929 }
930 
931 static int stk_try_fmt_vid_cap(struct file *filp,
932                 struct v4l2_format *fmtd, int *idx)
933 {
934         int i;
935         switch (fmtd->fmt.pix.pixelformat) {
936         case V4L2_PIX_FMT_RGB565:
937         case V4L2_PIX_FMT_RGB565X:
938         case V4L2_PIX_FMT_UYVY:
939         case V4L2_PIX_FMT_YUYV:
940         case V4L2_PIX_FMT_SBGGR8:
941                 break;
942         default:
943                 return -EINVAL;
944         }
945         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
946                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
947                         break;
948         }
949         if (i == ARRAY_SIZE(stk_sizes)
950                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
951                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
952                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
953                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
954                 if (idx)
955                         *idx = i - 1;
956         } else {
957                 fmtd->fmt.pix.height = stk_sizes[i].h;
958                 fmtd->fmt.pix.width = stk_sizes[i].w;
959                 if (idx)
960                         *idx = i;
961         }
962 
963         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
964         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
965         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
966                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
967         else
968                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
969         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
970                 * fmtd->fmt.pix.height;
971         return 0;
972 }
973 
974 static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
975                 void *priv, struct v4l2_format *fmtd)
976 {
977         return stk_try_fmt_vid_cap(filp, fmtd, NULL);
978 }
979 
980 static int stk_setup_format(struct stk_camera *dev)
981 {
982         int i = 0;
983         int depth;
984         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
985                 depth = 1;
986         else
987                 depth = 2;
988         while (i < ARRAY_SIZE(stk_sizes) &&
989                         stk_sizes[i].m != dev->vsettings.mode)
990                 i++;
991         if (i == ARRAY_SIZE(stk_sizes)) {
992                 STK_ERROR("Something is broken in %s\n", __func__);
993                 return -EFAULT;
994         }
995         /* This registers controls some timings, not sure of what. */
996         stk_camera_write_reg(dev, 0x001b, 0x0e);
997         if (dev->vsettings.mode == MODE_SXGA)
998                 stk_camera_write_reg(dev, 0x001c, 0x0e);
999         else
1000                 stk_camera_write_reg(dev, 0x001c, 0x46);
1001         /*
1002          * Registers 0x0115 0x0114 are the size of each line (bytes),
1003          * regs 0x0117 0x0116 are the heigth of the image.
1004          */
1005         stk_camera_write_reg(dev, 0x0115,
1006                 ((stk_sizes[i].w * depth) >> 8) & 0xff);
1007         stk_camera_write_reg(dev, 0x0114,
1008                 (stk_sizes[i].w * depth) & 0xff);
1009         stk_camera_write_reg(dev, 0x0117,
1010                 (stk_sizes[i].h >> 8) & 0xff);
1011         stk_camera_write_reg(dev, 0x0116,
1012                 stk_sizes[i].h & 0xff);
1013         return stk_sensor_configure(dev);
1014 }
1015 
1016 static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
1017                 void *priv, struct v4l2_format *fmtd)
1018 {
1019         int ret;
1020         int idx;
1021         struct stk_camera *dev = video_drvdata(filp);
1022 
1023         if (dev == NULL)
1024                 return -ENODEV;
1025         if (!is_present(dev))
1026                 return -ENODEV;
1027         if (is_streaming(dev))
1028                 return -EBUSY;
1029         if (dev->owner)
1030                 return -EBUSY;
1031         ret = stk_try_fmt_vid_cap(filp, fmtd, &idx);
1032         if (ret)
1033                 return ret;
1034 
1035         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1036         stk_free_buffers(dev);
1037         dev->frame_size = fmtd->fmt.pix.sizeimage;
1038         dev->vsettings.mode = stk_sizes[idx].m;
1039 
1040         stk_initialise(dev);
1041         return stk_setup_format(dev);
1042 }
1043 
1044 static int stk_vidioc_reqbufs(struct file *filp,
1045                 void *priv, struct v4l2_requestbuffers *rb)
1046 {
1047         struct stk_camera *dev = video_drvdata(filp);
1048 
1049         if (dev == NULL)
1050                 return -ENODEV;
1051         if (rb->memory != V4L2_MEMORY_MMAP)
1052                 return -EINVAL;
1053         if (is_streaming(dev)
1054                 || (dev->owner && dev->owner != filp))
1055                 return -EBUSY;
1056         stk_free_buffers(dev);
1057         if (rb->count == 0) {
1058                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
1059                 unset_initialised(dev);
1060                 dev->owner = NULL;
1061                 return 0;
1062         }
1063         dev->owner = filp;
1064 
1065         /*FIXME If they ask for zero, we must stop streaming and free */
1066         if (rb->count < 3)
1067                 rb->count = 3;
1068         /* Arbitrary limit */
1069         else if (rb->count > 5)
1070                 rb->count = 5;
1071 
1072         stk_allocate_buffers(dev, rb->count);
1073         rb->count = dev->n_sbufs;
1074         return 0;
1075 }
1076 
1077 static int stk_vidioc_querybuf(struct file *filp,
1078                 void *priv, struct v4l2_buffer *buf)
1079 {
1080         struct stk_camera *dev = video_drvdata(filp);
1081         struct stk_sio_buffer *sbuf;
1082 
1083         if (buf->index >= dev->n_sbufs)
1084                 return -EINVAL;
1085         sbuf = dev->sio_bufs + buf->index;
1086         *buf = sbuf->v4lbuf;
1087         return 0;
1088 }
1089 
1090 static int stk_vidioc_qbuf(struct file *filp,
1091                 void *priv, struct v4l2_buffer *buf)
1092 {
1093         struct stk_camera *dev = video_drvdata(filp);
1094         struct stk_sio_buffer *sbuf;
1095         unsigned long flags;
1096 
1097         if (buf->memory != V4L2_MEMORY_MMAP)
1098                 return -EINVAL;
1099 
1100         if (buf->index >= dev->n_sbufs)
1101                 return -EINVAL;
1102         sbuf = dev->sio_bufs + buf->index;
1103         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1104                 return 0;
1105         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1106         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1107         spin_lock_irqsave(&dev->spinlock, flags);
1108         list_add_tail(&sbuf->list, &dev->sio_avail);
1109         *buf = sbuf->v4lbuf;
1110         spin_unlock_irqrestore(&dev->spinlock, flags);
1111         return 0;
1112 }
1113 
1114 static int stk_vidioc_dqbuf(struct file *filp,
1115                 void *priv, struct v4l2_buffer *buf)
1116 {
1117         struct stk_camera *dev = video_drvdata(filp);
1118         struct stk_sio_buffer *sbuf;
1119         unsigned long flags;
1120         int ret;
1121 
1122         if (!is_streaming(dev))
1123                 return -EINVAL;
1124 
1125         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1126                 return -EWOULDBLOCK;
1127         ret = wait_event_interruptible(dev->wait_frame,
1128                 !list_empty(&dev->sio_full) || !is_present(dev));
1129         if (ret)
1130                 return ret;
1131         if (!is_present(dev))
1132                 return -EIO;
1133 
1134         spin_lock_irqsave(&dev->spinlock, flags);
1135         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1136         list_del_init(&sbuf->list);
1137         spin_unlock_irqrestore(&dev->spinlock, flags);
1138         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1139         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1140         sbuf->v4lbuf.sequence = ++dev->sequence;
1141         v4l2_get_timestamp(&sbuf->v4lbuf.timestamp);
1142 
1143         *buf = sbuf->v4lbuf;
1144         return 0;
1145 }
1146 
1147 static int stk_vidioc_streamon(struct file *filp,
1148                 void *priv, enum v4l2_buf_type type)
1149 {
1150         struct stk_camera *dev = video_drvdata(filp);
1151         if (is_streaming(dev))
1152                 return 0;
1153         if (dev->sio_bufs == NULL)
1154                 return -EINVAL;
1155         dev->sequence = 0;
1156         return stk_start_stream(dev);
1157 }
1158 
1159 static int stk_vidioc_streamoff(struct file *filp,
1160                 void *priv, enum v4l2_buf_type type)
1161 {
1162         struct stk_camera *dev = video_drvdata(filp);
1163         unsigned long flags;
1164         int i;
1165         stk_stop_stream(dev);
1166         spin_lock_irqsave(&dev->spinlock, flags);
1167         INIT_LIST_HEAD(&dev->sio_avail);
1168         INIT_LIST_HEAD(&dev->sio_full);
1169         for (i = 0; i < dev->n_sbufs; i++) {
1170                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1171                 dev->sio_bufs[i].v4lbuf.flags = 0;
1172         }
1173         spin_unlock_irqrestore(&dev->spinlock, flags);
1174         return 0;
1175 }
1176 
1177 
1178 static int stk_vidioc_g_parm(struct file *filp,
1179                 void *priv, struct v4l2_streamparm *sp)
1180 {
1181         /*FIXME This is not correct */
1182         sp->parm.capture.timeperframe.numerator = 1;
1183         sp->parm.capture.timeperframe.denominator = 30;
1184         sp->parm.capture.readbuffers = 2;
1185         return 0;
1186 }
1187 
1188 static int stk_vidioc_enum_framesizes(struct file *filp,
1189                 void *priv, struct v4l2_frmsizeenum *frms)
1190 {
1191         if (frms->index >= ARRAY_SIZE(stk_sizes))
1192                 return -EINVAL;
1193         switch (frms->pixel_format) {
1194         case V4L2_PIX_FMT_RGB565:
1195         case V4L2_PIX_FMT_RGB565X:
1196         case V4L2_PIX_FMT_UYVY:
1197         case V4L2_PIX_FMT_YUYV:
1198         case V4L2_PIX_FMT_SBGGR8:
1199                 frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1200                 frms->discrete.width = stk_sizes[frms->index].w;
1201                 frms->discrete.height = stk_sizes[frms->index].h;
1202                 return 0;
1203         default: return -EINVAL;
1204         }
1205 }
1206 
1207 static const struct v4l2_ctrl_ops stk_ctrl_ops = {
1208         .s_ctrl = stk_s_ctrl,
1209 };
1210 
1211 static struct v4l2_file_operations v4l_stk_fops = {
1212         .owner = THIS_MODULE,
1213         .open = v4l_stk_open,
1214         .release = v4l_stk_release,
1215         .read = v4l_stk_read,
1216         .poll = v4l_stk_poll,
1217         .mmap = v4l_stk_mmap,
1218         .unlocked_ioctl = video_ioctl2,
1219 };
1220 
1221 static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
1222         .vidioc_querycap = stk_vidioc_querycap,
1223         .vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
1224         .vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
1225         .vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
1226         .vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
1227         .vidioc_enum_input = stk_vidioc_enum_input,
1228         .vidioc_s_input = stk_vidioc_s_input,
1229         .vidioc_g_input = stk_vidioc_g_input,
1230         .vidioc_reqbufs = stk_vidioc_reqbufs,
1231         .vidioc_querybuf = stk_vidioc_querybuf,
1232         .vidioc_qbuf = stk_vidioc_qbuf,
1233         .vidioc_dqbuf = stk_vidioc_dqbuf,
1234         .vidioc_streamon = stk_vidioc_streamon,
1235         .vidioc_streamoff = stk_vidioc_streamoff,
1236         .vidioc_g_parm = stk_vidioc_g_parm,
1237         .vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
1238         .vidioc_log_status = v4l2_ctrl_log_status,
1239         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1240         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1241 };
1242 
1243 static void stk_v4l_dev_release(struct video_device *vd)
1244 {
1245         struct stk_camera *dev = vdev_to_camera(vd);
1246 
1247         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
1248                 STK_ERROR("We are leaking memory\n");
1249         usb_put_intf(dev->interface);
1250         kfree(dev);
1251 }
1252 
1253 static struct video_device stk_v4l_data = {
1254         .name = "stkwebcam",
1255         .fops = &v4l_stk_fops,
1256         .ioctl_ops = &v4l_stk_ioctl_ops,
1257         .release = stk_v4l_dev_release,
1258 };
1259 
1260 
1261 static int stk_register_video_device(struct stk_camera *dev)
1262 {
1263         int err;
1264 
1265         dev->vdev = stk_v4l_data;
1266         dev->vdev.lock = &dev->lock;
1267         dev->vdev.v4l2_dev = &dev->v4l2_dev;
1268         video_set_drvdata(&dev->vdev, dev);
1269         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1270         if (err)
1271                 STK_ERROR("v4l registration failed\n");
1272         else
1273                 STK_INFO("Syntek USB2.0 Camera is now controlling device %s\n",
1274                          video_device_node_name(&dev->vdev));
1275         return err;
1276 }
1277 
1278 
1279 /* USB Stuff */
1280 
1281 static int stk_camera_probe(struct usb_interface *interface,
1282                 const struct usb_device_id *id)
1283 {
1284         struct v4l2_ctrl_handler *hdl;
1285         int err = 0;
1286         int i;
1287 
1288         struct stk_camera *dev = NULL;
1289         struct usb_device *udev = interface_to_usbdev(interface);
1290         struct usb_host_interface *iface_desc;
1291         struct usb_endpoint_descriptor *endpoint;
1292 
1293         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1294         if (dev == NULL) {
1295                 STK_ERROR("Out of memory !\n");
1296                 return -ENOMEM;
1297         }
1298         err = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
1299         if (err < 0) {
1300                 dev_err(&udev->dev, "couldn't register v4l2_device\n");
1301                 kfree(dev);
1302                 return err;
1303         }
1304         hdl = &dev->hdl;
1305         v4l2_ctrl_handler_init(hdl, 3);
1306         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1307                           V4L2_CID_BRIGHTNESS, 0, 0xff, 0x1, 0x60);
1308         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1309                           V4L2_CID_HFLIP, 0, 1, 1, 1);
1310         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1311                           V4L2_CID_VFLIP, 0, 1, 1, 1);
1312         if (hdl->error) {
1313                 err = hdl->error;
1314                 dev_err(&udev->dev, "couldn't register control\n");
1315                 goto error;
1316         }
1317         dev->v4l2_dev.ctrl_handler = hdl;
1318 
1319         spin_lock_init(&dev->spinlock);
1320         mutex_init(&dev->lock);
1321         init_waitqueue_head(&dev->wait_frame);
1322         dev->first_init = 1; /* webcam LED management */
1323 
1324         dev->udev = udev;
1325         dev->interface = interface;
1326         usb_get_intf(interface);
1327 
1328         if (hflip != -1)
1329                 dev->vsettings.hflip = hflip;
1330         else if (dmi_check_system(stk_upside_down_dmi_table))
1331                 dev->vsettings.hflip = 1;
1332         else
1333                 dev->vsettings.hflip = 0;
1334         if (vflip != -1)
1335                 dev->vsettings.vflip = vflip;
1336         else if (dmi_check_system(stk_upside_down_dmi_table))
1337                 dev->vsettings.vflip = 1;
1338         else
1339                 dev->vsettings.vflip = 0;
1340         dev->n_sbufs = 0;
1341         set_present(dev);
1342 
1343         /* Set up the endpoint information
1344          * use only the first isoc-in endpoint
1345          * for the current alternate setting */
1346         iface_desc = interface->cur_altsetting;
1347 
1348         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1349                 endpoint = &iface_desc->endpoint[i].desc;
1350 
1351                 if (!dev->isoc_ep
1352                         && usb_endpoint_is_isoc_in(endpoint)) {
1353                         /* we found an isoc in endpoint */
1354                         dev->isoc_ep = usb_endpoint_num(endpoint);
1355                         break;
1356                 }
1357         }
1358         if (!dev->isoc_ep) {
1359                 STK_ERROR("Could not find isoc-in endpoint");
1360                 err = -ENODEV;
1361                 goto error;
1362         }
1363         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1364         dev->vsettings.mode = MODE_VGA;
1365         dev->frame_size = 640 * 480 * 2;
1366 
1367         INIT_LIST_HEAD(&dev->sio_avail);
1368         INIT_LIST_HEAD(&dev->sio_full);
1369 
1370         usb_set_intfdata(interface, dev);
1371 
1372         err = stk_register_video_device(dev);
1373         if (err)
1374                 goto error;
1375 
1376         return 0;
1377 
1378 error:
1379         v4l2_ctrl_handler_free(hdl);
1380         v4l2_device_unregister(&dev->v4l2_dev);
1381         kfree(dev);
1382         return err;
1383 }
1384 
1385 static void stk_camera_disconnect(struct usb_interface *interface)
1386 {
1387         struct stk_camera *dev = usb_get_intfdata(interface);
1388 
1389         usb_set_intfdata(interface, NULL);
1390         unset_present(dev);
1391 
1392         wake_up_interruptible(&dev->wait_frame);
1393 
1394         STK_INFO("Syntek USB2.0 Camera release resources device %s\n",
1395                  video_device_node_name(&dev->vdev));
1396 
1397         video_unregister_device(&dev->vdev);
1398         v4l2_ctrl_handler_free(&dev->hdl);
1399         v4l2_device_unregister(&dev->v4l2_dev);
1400 }
1401 
1402 #ifdef CONFIG_PM
1403 static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
1404 {
1405         struct stk_camera *dev = usb_get_intfdata(intf);
1406         if (is_streaming(dev)) {
1407                 stk_stop_stream(dev);
1408                 /* yes, this is ugly */
1409                 set_streaming(dev);
1410         }
1411         return 0;
1412 }
1413 
1414 static int stk_camera_resume(struct usb_interface *intf)
1415 {
1416         struct stk_camera *dev = usb_get_intfdata(intf);
1417         if (!is_initialised(dev))
1418                 return 0;
1419         unset_initialised(dev);
1420         stk_initialise(dev);
1421         stk_camera_write_reg(dev, 0x0, 0x49);
1422         stk_setup_format(dev);
1423         if (is_streaming(dev))
1424                 stk_start_stream(dev);
1425         return 0;
1426 }
1427 #endif
1428 
1429 static struct usb_driver stk_camera_driver = {
1430         .name = "stkwebcam",
1431         .probe = stk_camera_probe,
1432         .disconnect = stk_camera_disconnect,
1433         .id_table = stkwebcam_table,
1434 #ifdef CONFIG_PM
1435         .suspend = stk_camera_suspend,
1436         .resume = stk_camera_resume,
1437 #endif
1438 };
1439 
1440 module_usb_driver(stk_camera_driver);
1441 

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