Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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         int ret;
151 
152         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
153                         0x00,
154                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
155                         0x00,
156                         index,
157                         (u8 *) value,
158                         sizeof(u8),
159                         500);
160         if (ret < 0)
161                 return ret;
162         else
163                 return 0;
164 }
165 
166 static int stk_start_stream(struct stk_camera *dev)
167 {
168         int value;
169         int i, ret;
170         int value_116, value_117;
171 
172         if (!is_present(dev))
173                 return -ENODEV;
174         if (!is_memallocd(dev) || !is_initialised(dev)) {
175                 STK_ERROR("FIXME: Buffers are not allocated\n");
176                 return -EFAULT;
177         }
178         ret = usb_set_interface(dev->udev, 0, 5);
179 
180         if (ret < 0)
181                 STK_ERROR("usb_set_interface failed !\n");
182         if (stk_sensor_wakeup(dev))
183                 STK_ERROR("error awaking the sensor\n");
184 
185         stk_camera_read_reg(dev, 0x0116, &value_116);
186         stk_camera_read_reg(dev, 0x0117, &value_117);
187 
188         stk_camera_write_reg(dev, 0x0116, 0x0000);
189         stk_camera_write_reg(dev, 0x0117, 0x0000);
190 
191         stk_camera_read_reg(dev, 0x0100, &value);
192         stk_camera_write_reg(dev, 0x0100, value | 0x80);
193 
194         stk_camera_write_reg(dev, 0x0116, value_116);
195         stk_camera_write_reg(dev, 0x0117, value_117);
196         for (i = 0; i < MAX_ISO_BUFS; i++) {
197                 if (dev->isobufs[i].urb) {
198                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
199                         atomic_inc(&dev->urbs_used);
200                         if (ret)
201                                 return ret;
202                 }
203         }
204         set_streaming(dev);
205         return 0;
206 }
207 
208 static int stk_stop_stream(struct stk_camera *dev)
209 {
210         int value;
211         int i;
212         if (is_present(dev)) {
213                 stk_camera_read_reg(dev, 0x0100, &value);
214                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
215                 if (dev->isobufs != NULL) {
216                         for (i = 0; i < MAX_ISO_BUFS; i++) {
217                                 if (dev->isobufs[i].urb)
218                                         usb_kill_urb(dev->isobufs[i].urb);
219                         }
220                 }
221                 unset_streaming(dev);
222 
223                 if (usb_set_interface(dev->udev, 0, 0))
224                         STK_ERROR("usb_set_interface failed !\n");
225                 if (stk_sensor_sleep(dev))
226                         STK_ERROR("error suspending the sensor\n");
227         }
228         return 0;
229 }
230 
231 /*
232  * This seems to be the shortest init sequence we
233  * must do in order to find the sensor
234  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
235  * is also reset. Maybe powers down it?
236  * Rest of values don't make a difference
237  */
238 
239 static struct regval stk1125_initvals[] = {
240         /*TODO: What means this sequence? */
241         {0x0000, 0x24},
242         {0x0100, 0x21},
243         {0x0002, 0x68},
244         {0x0003, 0x80},
245         {0x0005, 0x00},
246         {0x0007, 0x03},
247         {0x000d, 0x00},
248         {0x000f, 0x02},
249         {0x0300, 0x12},
250         {0x0350, 0x41},
251         {0x0351, 0x00},
252         {0x0352, 0x00},
253         {0x0353, 0x00},
254         {0x0018, 0x10},
255         {0x0019, 0x00},
256         {0x001b, 0x0e},
257         {0x001c, 0x46},
258         {0x0300, 0x80},
259         {0x001a, 0x04},
260         {0x0110, 0x00},
261         {0x0111, 0x00},
262         {0x0112, 0x00},
263         {0x0113, 0x00},
264 
265         {0xffff, 0xff},
266 };
267 
268 
269 static int stk_initialise(struct stk_camera *dev)
270 {
271         struct regval *rv;
272         int ret;
273         if (!is_present(dev))
274                 return -ENODEV;
275         if (is_initialised(dev))
276                 return 0;
277         rv = stk1125_initvals;
278         while (rv->reg != 0xffff) {
279                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
280                 if (ret)
281                         return ret;
282                 rv++;
283         }
284         if (stk_sensor_init(dev) == 0) {
285                 set_initialised(dev);
286                 return 0;
287         } else
288                 return -1;
289 }
290 
291 /* *********************************************** */
292 /*
293  * This function is called as an URB transfert is complete (Isochronous pipe).
294  * So, the traitement is done in interrupt time, so it has be fast, not crash,
295  * and not stall. Neat.
296  */
297 static void stk_isoc_handler(struct urb *urb)
298 {
299         int i;
300         int ret;
301         int framelen;
302         unsigned long flags;
303 
304         unsigned char *fill = NULL;
305         unsigned char *iso_buf = NULL;
306 
307         struct stk_camera *dev;
308         struct stk_sio_buffer *fb;
309 
310         dev = (struct stk_camera *) urb->context;
311 
312         if (dev == NULL) {
313                 STK_ERROR("isoc_handler called with NULL device !\n");
314                 return;
315         }
316 
317         if (urb->status == -ENOENT || urb->status == -ECONNRESET
318                 || urb->status == -ESHUTDOWN) {
319                 atomic_dec(&dev->urbs_used);
320                 return;
321         }
322 
323         spin_lock_irqsave(&dev->spinlock, flags);
324 
325         if (urb->status != -EINPROGRESS && urb->status != 0) {
326                 STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
327                 goto resubmit;
328         }
329 
330         if (list_empty(&dev->sio_avail)) {
331                 /*FIXME Stop streaming after a while */
332                 (void) (printk_ratelimit() &&
333                 STK_ERROR("isoc_handler without available buffer!\n"));
334                 goto resubmit;
335         }
336         fb = list_first_entry(&dev->sio_avail,
337                         struct stk_sio_buffer, list);
338         fill = fb->buffer + fb->v4lbuf.bytesused;
339 
340         for (i = 0; i < urb->number_of_packets; i++) {
341                 if (urb->iso_frame_desc[i].status != 0) {
342                         if (urb->iso_frame_desc[i].status != -EXDEV)
343                                 STK_ERROR("Frame %d has error %d\n", i,
344                                         urb->iso_frame_desc[i].status);
345                         continue;
346                 }
347                 framelen = urb->iso_frame_desc[i].actual_length;
348                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
349 
350                 if (framelen <= 4)
351                         continue; /* no data */
352 
353                 /*
354                  * we found something informational from there
355                  * the isoc frames have to type of headers
356                  * type1: 00 xx 00 00 or 20 xx 00 00
357                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
358                  * xx is a sequencer which has never been seen over 0x3f
359                  * imho data written down looks like bayer, i see similarities
360                  * after every 640 bytes
361                  */
362                 if (*iso_buf & 0x80) {
363                         framelen -= 8;
364                         iso_buf += 8;
365                         /* This marks a new frame */
366                         if (fb->v4lbuf.bytesused != 0
367                                 && fb->v4lbuf.bytesused != dev->frame_size) {
368                                 (void) (printk_ratelimit() &&
369                                 STK_ERROR("frame %d, "
370                                         "bytesused=%d, skipping\n",
371                                         i, fb->v4lbuf.bytesused));
372                                 fb->v4lbuf.bytesused = 0;
373                                 fill = fb->buffer;
374                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
375                                 if (list_is_singular(&dev->sio_avail)) {
376                                         /* Always reuse the last buffer */
377                                         fb->v4lbuf.bytesused = 0;
378                                         fill = fb->buffer;
379                                 } else {
380                                         list_move_tail(dev->sio_avail.next,
381                                                 &dev->sio_full);
382                                         wake_up(&dev->wait_frame);
383                                         fb = list_first_entry(&dev->sio_avail,
384                                                 struct stk_sio_buffer, list);
385                                         fb->v4lbuf.bytesused = 0;
386                                         fill = fb->buffer;
387                                 }
388                         }
389                 } else {
390                         framelen -= 4;
391                         iso_buf += 4;
392                 }
393 
394                 /* Our buffer is full !!! */
395                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
396                         (void) (printk_ratelimit() &&
397                         STK_ERROR("Frame buffer overflow, lost sync\n"));
398                         /*FIXME Do something here? */
399                         continue;
400                 }
401                 spin_unlock_irqrestore(&dev->spinlock, flags);
402                 memcpy(fill, iso_buf, framelen);
403                 spin_lock_irqsave(&dev->spinlock, flags);
404                 fill += framelen;
405 
406                 /* New size of our buffer */
407                 fb->v4lbuf.bytesused += framelen;
408         }
409 
410 resubmit:
411         spin_unlock_irqrestore(&dev->spinlock, flags);
412         urb->dev = dev->udev;
413         ret = usb_submit_urb(urb, GFP_ATOMIC);
414         if (ret != 0) {
415                 STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
416                         ret);
417         }
418 }
419 
420 /* -------------------------------------------- */
421 
422 static int stk_prepare_iso(struct stk_camera *dev)
423 {
424         void *kbuf;
425         int i, j;
426         struct urb *urb;
427         struct usb_device *udev;
428 
429         if (dev == NULL)
430                 return -ENXIO;
431         udev = dev->udev;
432 
433         if (dev->isobufs)
434                 STK_ERROR("isobufs already allocated. Bad\n");
435         else
436                 dev->isobufs = kcalloc(MAX_ISO_BUFS, sizeof(*dev->isobufs),
437                                        GFP_KERNEL);
438         if (dev->isobufs == NULL) {
439                 STK_ERROR("Unable to allocate iso buffers\n");
440                 return -ENOMEM;
441         }
442         for (i = 0; i < MAX_ISO_BUFS; i++) {
443                 if (dev->isobufs[i].data == NULL) {
444                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
445                         if (kbuf == NULL) {
446                                 STK_ERROR("Failed to allocate iso buffer %d\n",
447                                         i);
448                                 goto isobufs_out;
449                         }
450                         dev->isobufs[i].data = kbuf;
451                 } else
452                         STK_ERROR("isobuf data already allocated\n");
453                 if (dev->isobufs[i].urb == NULL) {
454                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
455                         if (urb == NULL) {
456                                 STK_ERROR("Failed to allocate URB %d\n", i);
457                                 goto isobufs_out;
458                         }
459                         dev->isobufs[i].urb = urb;
460                 } else {
461                         STK_ERROR("Killing URB\n");
462                         usb_kill_urb(dev->isobufs[i].urb);
463                         urb = dev->isobufs[i].urb;
464                 }
465                 urb->interval = 1;
466                 urb->dev = udev;
467                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
468                 urb->transfer_flags = URB_ISO_ASAP;
469                 urb->transfer_buffer = dev->isobufs[i].data;
470                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
471                 urb->complete = stk_isoc_handler;
472                 urb->context = dev;
473                 urb->start_frame = 0;
474                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
475 
476                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
477                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
478                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
479                 }
480         }
481         set_memallocd(dev);
482         return 0;
483 
484 isobufs_out:
485         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
486                 kfree(dev->isobufs[i].data);
487         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
488                 usb_free_urb(dev->isobufs[i].urb);
489         kfree(dev->isobufs);
490         dev->isobufs = NULL;
491         return -ENOMEM;
492 }
493 
494 static void stk_clean_iso(struct stk_camera *dev)
495 {
496         int i;
497 
498         if (dev == NULL || dev->isobufs == NULL)
499                 return;
500 
501         for (i = 0; i < MAX_ISO_BUFS; i++) {
502                 struct urb *urb;
503 
504                 urb = dev->isobufs[i].urb;
505                 if (urb) {
506                         if (atomic_read(&dev->urbs_used) && is_present(dev))
507                                 usb_kill_urb(urb);
508                         usb_free_urb(urb);
509                 }
510                 kfree(dev->isobufs[i].data);
511         }
512         kfree(dev->isobufs);
513         dev->isobufs = NULL;
514         unset_memallocd(dev);
515 }
516 
517 static int stk_setup_siobuf(struct stk_camera *dev, int index)
518 {
519         struct stk_sio_buffer *buf = dev->sio_bufs + index;
520         INIT_LIST_HEAD(&buf->list);
521         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
522         buf->buffer = vmalloc_user(buf->v4lbuf.length);
523         if (buf->buffer == NULL)
524                 return -ENOMEM;
525         buf->mapcount = 0;
526         buf->dev = dev;
527         buf->v4lbuf.index = index;
528         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
529         buf->v4lbuf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
530         buf->v4lbuf.field = V4L2_FIELD_NONE;
531         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
532         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
533         return 0;
534 }
535 
536 static int stk_free_sio_buffers(struct stk_camera *dev)
537 {
538         int i;
539         int nbufs;
540         unsigned long flags;
541         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
542                 return 0;
543         /*
544         * If any buffers are mapped, we cannot free them at all.
545         */
546         for (i = 0; i < dev->n_sbufs; i++) {
547                 if (dev->sio_bufs[i].mapcount > 0)
548                         return -EBUSY;
549         }
550         /*
551         * OK, let's do it.
552         */
553         spin_lock_irqsave(&dev->spinlock, flags);
554         INIT_LIST_HEAD(&dev->sio_avail);
555         INIT_LIST_HEAD(&dev->sio_full);
556         nbufs = dev->n_sbufs;
557         dev->n_sbufs = 0;
558         spin_unlock_irqrestore(&dev->spinlock, flags);
559         for (i = 0; i < nbufs; i++) {
560                 if (dev->sio_bufs[i].buffer != NULL)
561                         vfree(dev->sio_bufs[i].buffer);
562         }
563         kfree(dev->sio_bufs);
564         dev->sio_bufs = NULL;
565         return 0;
566 }
567 
568 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
569 {
570         int i;
571         if (dev->sio_bufs != NULL)
572                 STK_ERROR("sio_bufs already allocated\n");
573         else {
574                 dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
575                                 GFP_KERNEL);
576                 if (dev->sio_bufs == NULL)
577                         return -ENOMEM;
578                 for (i = 0; i < n_sbufs; i++) {
579                         if (stk_setup_siobuf(dev, i))
580                                 return (dev->n_sbufs > 1 ? 0 : -ENOMEM);
581                         dev->n_sbufs = i+1;
582                 }
583         }
584         return 0;
585 }
586 
587 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
588 {
589         int err;
590         err = stk_prepare_iso(dev);
591         if (err) {
592                 stk_clean_iso(dev);
593                 return err;
594         }
595         err = stk_prepare_sio_buffers(dev, n_sbufs);
596         if (err) {
597                 stk_free_sio_buffers(dev);
598                 return err;
599         }
600         return 0;
601 }
602 
603 static void stk_free_buffers(struct stk_camera *dev)
604 {
605         stk_clean_iso(dev);
606         stk_free_sio_buffers(dev);
607 }
608 /* -------------------------------------------- */
609 
610 /* v4l file operations */
611 
612 static int v4l_stk_open(struct file *fp)
613 {
614         struct stk_camera *dev = video_drvdata(fp);
615         int err;
616 
617         if (dev == NULL || !is_present(dev))
618                 return -ENXIO;
619 
620         if (mutex_lock_interruptible(&dev->lock))
621                 return -ERESTARTSYS;
622         if (!dev->first_init)
623                 stk_camera_write_reg(dev, 0x0, 0x24);
624         else
625                 dev->first_init = 0;
626 
627         err = v4l2_fh_open(fp);
628         if (!err)
629                 usb_autopm_get_interface(dev->interface);
630         mutex_unlock(&dev->lock);
631         return err;
632 }
633 
634 static int v4l_stk_release(struct file *fp)
635 {
636         struct stk_camera *dev = video_drvdata(fp);
637 
638         mutex_lock(&dev->lock);
639         if (dev->owner == fp) {
640                 stk_stop_stream(dev);
641                 stk_free_buffers(dev);
642                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
643                 unset_initialised(dev);
644                 dev->owner = NULL;
645         }
646 
647         if (is_present(dev))
648                 usb_autopm_put_interface(dev->interface);
649         mutex_unlock(&dev->lock);
650         return v4l2_fh_release(fp);
651 }
652 
653 static ssize_t stk_read(struct file *fp, char __user *buf,
654                 size_t count, loff_t *f_pos)
655 {
656         int i;
657         int ret;
658         unsigned long flags;
659         struct stk_sio_buffer *sbuf;
660         struct stk_camera *dev = video_drvdata(fp);
661 
662         if (!is_present(dev))
663                 return -EIO;
664         if (dev->owner && (!dev->reading || dev->owner != fp))
665                 return -EBUSY;
666         dev->owner = fp;
667         if (!is_streaming(dev)) {
668                 if (stk_initialise(dev)
669                         || stk_allocate_buffers(dev, 3)
670                         || stk_start_stream(dev))
671                         return -ENOMEM;
672                 dev->reading = 1;
673                 spin_lock_irqsave(&dev->spinlock, flags);
674                 for (i = 0; i < dev->n_sbufs; i++) {
675                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
676                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
677                 }
678                 spin_unlock_irqrestore(&dev->spinlock, flags);
679         }
680         if (*f_pos == 0) {
681                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
682                         return -EWOULDBLOCK;
683                 ret = wait_event_interruptible(dev->wait_frame,
684                         !list_empty(&dev->sio_full) || !is_present(dev));
685                 if (ret)
686                         return ret;
687                 if (!is_present(dev))
688                         return -EIO;
689         }
690         if (count + *f_pos > dev->frame_size)
691                 count = dev->frame_size - *f_pos;
692         spin_lock_irqsave(&dev->spinlock, flags);
693         if (list_empty(&dev->sio_full)) {
694                 spin_unlock_irqrestore(&dev->spinlock, flags);
695                 STK_ERROR("BUG: No siobufs ready\n");
696                 return 0;
697         }
698         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
699         spin_unlock_irqrestore(&dev->spinlock, flags);
700 
701         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
702                 return -EFAULT;
703 
704         *f_pos += count;
705 
706         if (*f_pos >= dev->frame_size) {
707                 *f_pos = 0;
708                 spin_lock_irqsave(&dev->spinlock, flags);
709                 list_move_tail(&sbuf->list, &dev->sio_avail);
710                 spin_unlock_irqrestore(&dev->spinlock, flags);
711         }
712         return count;
713 }
714 
715 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
716                 size_t count, loff_t *f_pos)
717 {
718         struct stk_camera *dev = video_drvdata(fp);
719         int ret;
720 
721         if (mutex_lock_interruptible(&dev->lock))
722                 return -ERESTARTSYS;
723         ret = stk_read(fp, buf, count, f_pos);
724         mutex_unlock(&dev->lock);
725         return ret;
726 }
727 
728 static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
729 {
730         struct stk_camera *dev = video_drvdata(fp);
731         unsigned res = v4l2_ctrl_poll(fp, wait);
732 
733         poll_wait(fp, &dev->wait_frame, wait);
734 
735         if (!is_present(dev))
736                 return POLLERR;
737 
738         if (!list_empty(&dev->sio_full))
739                 return res | POLLIN | POLLRDNORM;
740 
741         return res;
742 }
743 
744 
745 static void stk_v4l_vm_open(struct vm_area_struct *vma)
746 {
747         struct stk_sio_buffer *sbuf = vma->vm_private_data;
748         sbuf->mapcount++;
749 }
750 static void stk_v4l_vm_close(struct vm_area_struct *vma)
751 {
752         struct stk_sio_buffer *sbuf = vma->vm_private_data;
753         sbuf->mapcount--;
754         if (sbuf->mapcount == 0)
755                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
756 }
757 static const struct vm_operations_struct stk_v4l_vm_ops = {
758         .open = stk_v4l_vm_open,
759         .close = stk_v4l_vm_close
760 };
761 
762 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
763 {
764         unsigned int i;
765         int ret;
766         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
767         struct stk_camera *dev = video_drvdata(fp);
768         struct stk_sio_buffer *sbuf = NULL;
769 
770         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
771                 return -EINVAL;
772 
773         for (i = 0; i < dev->n_sbufs; i++) {
774                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
775                         sbuf = dev->sio_bufs + i;
776                         break;
777                 }
778         }
779         if (sbuf == NULL)
780                 return -EINVAL;
781         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
782         if (ret)
783                 return ret;
784         vma->vm_flags |= VM_DONTEXPAND;
785         vma->vm_private_data = sbuf;
786         vma->vm_ops = &stk_v4l_vm_ops;
787         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
788         stk_v4l_vm_open(vma);
789         return 0;
790 }
791 
792 /* v4l ioctl handlers */
793 
794 static int stk_vidioc_querycap(struct file *filp,
795                 void *priv, struct v4l2_capability *cap)
796 {
797         struct stk_camera *dev = video_drvdata(filp);
798 
799         strcpy(cap->driver, "stk");
800         strcpy(cap->card, "stk");
801         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
802 
803         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
804                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
805         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
806         return 0;
807 }
808 
809 static int stk_vidioc_enum_input(struct file *filp,
810                 void *priv, struct v4l2_input *input)
811 {
812         if (input->index != 0)
813                 return -EINVAL;
814 
815         strcpy(input->name, "Syntek USB Camera");
816         input->type = V4L2_INPUT_TYPE_CAMERA;
817         return 0;
818 }
819 
820 
821 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
822 {
823         *i = 0;
824         return 0;
825 }
826 
827 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
828 {
829         return i ? -EINVAL : 0;
830 }
831 
832 static int stk_s_ctrl(struct v4l2_ctrl *ctrl)
833 {
834         struct stk_camera *dev =
835                 container_of(ctrl->handler, struct stk_camera, hdl);
836 
837         switch (ctrl->id) {
838         case V4L2_CID_BRIGHTNESS:
839                 return stk_sensor_set_brightness(dev, ctrl->val);
840         case V4L2_CID_HFLIP:
841                 if (dmi_check_system(stk_upside_down_dmi_table))
842                         dev->vsettings.hflip = !ctrl->val;
843                 else
844                         dev->vsettings.hflip = ctrl->val;
845                 return 0;
846         case V4L2_CID_VFLIP:
847                 if (dmi_check_system(stk_upside_down_dmi_table))
848                         dev->vsettings.vflip = !ctrl->val;
849                 else
850                         dev->vsettings.vflip = ctrl->val;
851                 return 0;
852         default:
853                 return -EINVAL;
854         }
855         return 0;
856 }
857 
858 
859 static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
860                 void *priv, struct v4l2_fmtdesc *fmtd)
861 {
862         switch (fmtd->index) {
863         case 0:
864                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
865                 strcpy(fmtd->description, "r5g6b5");
866                 break;
867         case 1:
868                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
869                 strcpy(fmtd->description, "r5g6b5BE");
870                 break;
871         case 2:
872                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
873                 strcpy(fmtd->description, "yuv4:2:2");
874                 break;
875         case 3:
876                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
877                 strcpy(fmtd->description, "Raw bayer");
878                 break;
879         case 4:
880                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
881                 strcpy(fmtd->description, "yuv4:2:2");
882                 break;
883         default:
884                 return -EINVAL;
885         }
886         return 0;
887 }
888 
889 static struct stk_size {
890         unsigned w;
891         unsigned h;
892         enum stk_mode m;
893 } stk_sizes[] = {
894         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
895         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
896         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
897         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
898         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
899 };
900 
901 static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
902                 void *priv, struct v4l2_format *f)
903 {
904         struct v4l2_pix_format *pix_format = &f->fmt.pix;
905         struct stk_camera *dev = video_drvdata(filp);
906         int i;
907 
908         for (i = 0; i < ARRAY_SIZE(stk_sizes) &&
909                         stk_sizes[i].m != dev->vsettings.mode; i++)
910                 ;
911         if (i == ARRAY_SIZE(stk_sizes)) {
912                 STK_ERROR("ERROR: mode invalid\n");
913                 return -EINVAL;
914         }
915         pix_format->width = stk_sizes[i].w;
916         pix_format->height = stk_sizes[i].h;
917         pix_format->field = V4L2_FIELD_NONE;
918         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
919         pix_format->pixelformat = dev->vsettings.palette;
920         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
921                 pix_format->bytesperline = pix_format->width;
922         else
923                 pix_format->bytesperline = 2 * pix_format->width;
924         pix_format->sizeimage = pix_format->bytesperline
925                                 * pix_format->height;
926         pix_format->priv = 0;
927         return 0;
928 }
929 
930 static int stk_try_fmt_vid_cap(struct file *filp,
931                 struct v4l2_format *fmtd, int *idx)
932 {
933         int i;
934         switch (fmtd->fmt.pix.pixelformat) {
935         case V4L2_PIX_FMT_RGB565:
936         case V4L2_PIX_FMT_RGB565X:
937         case V4L2_PIX_FMT_UYVY:
938         case V4L2_PIX_FMT_YUYV:
939         case V4L2_PIX_FMT_SBGGR8:
940                 break;
941         default:
942                 return -EINVAL;
943         }
944         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
945                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
946                         break;
947         }
948         if (i == ARRAY_SIZE(stk_sizes)
949                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
950                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
951                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
952                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
953                 if (idx)
954                         *idx = i - 1;
955         } else {
956                 fmtd->fmt.pix.height = stk_sizes[i].h;
957                 fmtd->fmt.pix.width = stk_sizes[i].w;
958                 if (idx)
959                         *idx = i;
960         }
961 
962         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
963         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
964         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
965                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
966         else
967                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
968         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
969                 * fmtd->fmt.pix.height;
970         fmtd->fmt.pix.priv = 0;
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.debug = debug;
1268         dev->vdev.v4l2_dev = &dev->v4l2_dev;
1269         set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
1270         video_set_drvdata(&dev->vdev, dev);
1271         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1272         if (err)
1273                 STK_ERROR("v4l registration failed\n");
1274         else
1275                 STK_INFO("Syntek USB2.0 Camera is now controlling device %s\n",
1276                          video_device_node_name(&dev->vdev));
1277         return err;
1278 }
1279 
1280 
1281 /* USB Stuff */
1282 
1283 static int stk_camera_probe(struct usb_interface *interface,
1284                 const struct usb_device_id *id)
1285 {
1286         struct v4l2_ctrl_handler *hdl;
1287         int err = 0;
1288         int i;
1289 
1290         struct stk_camera *dev = NULL;
1291         struct usb_device *udev = interface_to_usbdev(interface);
1292         struct usb_host_interface *iface_desc;
1293         struct usb_endpoint_descriptor *endpoint;
1294 
1295         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1296         if (dev == NULL) {
1297                 STK_ERROR("Out of memory !\n");
1298                 return -ENOMEM;
1299         }
1300         err = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
1301         if (err < 0) {
1302                 dev_err(&udev->dev, "couldn't register v4l2_device\n");
1303                 kfree(dev);
1304                 return err;
1305         }
1306         hdl = &dev->hdl;
1307         v4l2_ctrl_handler_init(hdl, 3);
1308         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1309                           V4L2_CID_BRIGHTNESS, 0, 0xff, 0x1, 0x60);
1310         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1311                           V4L2_CID_HFLIP, 0, 1, 1, 1);
1312         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1313                           V4L2_CID_VFLIP, 0, 1, 1, 1);
1314         if (hdl->error) {
1315                 err = hdl->error;
1316                 dev_err(&udev->dev, "couldn't register control\n");
1317                 goto error;
1318         }
1319         dev->v4l2_dev.ctrl_handler = hdl;
1320 
1321         spin_lock_init(&dev->spinlock);
1322         mutex_init(&dev->lock);
1323         init_waitqueue_head(&dev->wait_frame);
1324         dev->first_init = 1; /* webcam LED management */
1325 
1326         dev->udev = udev;
1327         dev->interface = interface;
1328         usb_get_intf(interface);
1329 
1330         if (hflip != -1)
1331                 dev->vsettings.hflip = hflip;
1332         else if (dmi_check_system(stk_upside_down_dmi_table))
1333                 dev->vsettings.hflip = 1;
1334         else
1335                 dev->vsettings.hflip = 0;
1336         if (vflip != -1)
1337                 dev->vsettings.vflip = vflip;
1338         else if (dmi_check_system(stk_upside_down_dmi_table))
1339                 dev->vsettings.vflip = 1;
1340         else
1341                 dev->vsettings.vflip = 0;
1342         dev->n_sbufs = 0;
1343         set_present(dev);
1344 
1345         /* Set up the endpoint information
1346          * use only the first isoc-in endpoint
1347          * for the current alternate setting */
1348         iface_desc = interface->cur_altsetting;
1349 
1350         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1351                 endpoint = &iface_desc->endpoint[i].desc;
1352 
1353                 if (!dev->isoc_ep
1354                         && usb_endpoint_is_isoc_in(endpoint)) {
1355                         /* we found an isoc in endpoint */
1356                         dev->isoc_ep = usb_endpoint_num(endpoint);
1357                         break;
1358                 }
1359         }
1360         if (!dev->isoc_ep) {
1361                 STK_ERROR("Could not find isoc-in endpoint");
1362                 err = -ENODEV;
1363                 goto error;
1364         }
1365         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1366         dev->vsettings.mode = MODE_VGA;
1367         dev->frame_size = 640 * 480 * 2;
1368 
1369         INIT_LIST_HEAD(&dev->sio_avail);
1370         INIT_LIST_HEAD(&dev->sio_full);
1371 
1372         usb_set_intfdata(interface, dev);
1373 
1374         err = stk_register_video_device(dev);
1375         if (err)
1376                 goto error;
1377 
1378         return 0;
1379 
1380 error:
1381         v4l2_ctrl_handler_free(hdl);
1382         v4l2_device_unregister(&dev->v4l2_dev);
1383         kfree(dev);
1384         return err;
1385 }
1386 
1387 static void stk_camera_disconnect(struct usb_interface *interface)
1388 {
1389         struct stk_camera *dev = usb_get_intfdata(interface);
1390 
1391         usb_set_intfdata(interface, NULL);
1392         unset_present(dev);
1393 
1394         wake_up_interruptible(&dev->wait_frame);
1395 
1396         STK_INFO("Syntek USB2.0 Camera release resources device %s\n",
1397                  video_device_node_name(&dev->vdev));
1398 
1399         video_unregister_device(&dev->vdev);
1400         v4l2_ctrl_handler_free(&dev->hdl);
1401         v4l2_device_unregister(&dev->v4l2_dev);
1402 }
1403 
1404 #ifdef CONFIG_PM
1405 static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
1406 {
1407         struct stk_camera *dev = usb_get_intfdata(intf);
1408         if (is_streaming(dev)) {
1409                 stk_stop_stream(dev);
1410                 /* yes, this is ugly */
1411                 set_streaming(dev);
1412         }
1413         return 0;
1414 }
1415 
1416 static int stk_camera_resume(struct usb_interface *intf)
1417 {
1418         struct stk_camera *dev = usb_get_intfdata(intf);
1419         if (!is_initialised(dev))
1420                 return 0;
1421         unset_initialised(dev);
1422         stk_initialise(dev);
1423         stk_camera_write_reg(dev, 0x0, 0x49);
1424         stk_setup_format(dev);
1425         if (is_streaming(dev))
1426                 stk_start_stream(dev);
1427         return 0;
1428 }
1429 #endif
1430 
1431 static struct usb_driver stk_camera_driver = {
1432         .name = "stkwebcam",
1433         .probe = stk_camera_probe,
1434         .disconnect = stk_camera_disconnect,
1435         .id_table = stkwebcam_table,
1436 #ifdef CONFIG_PM
1437         .suspend = stk_camera_suspend,
1438         .resume = stk_camera_resume,
1439 #endif
1440 };
1441 
1442 module_usb_driver(stk_camera_driver);
1443 

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