Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[linux-2.6] / drivers / media / video / et61x251 / et61x251_core.c
1 /***************************************************************************
2  * V4L2 driver for ET61X[12]51 PC Camera Controllers                       *
3  *                                                                         *
4  * Copyright (C) 2006 by Luca Risolia <luca.risolia@studio.unibo.it>       *
5  *                                                                         *
6  * This program is free software; you can redistribute it and/or modify    *
7  * it under the terms of the GNU General Public License as published by    *
8  * the Free Software Foundation; either version 2 of the License, or       *
9  * (at your option) any later version.                                     *
10  *                                                                         *
11  * This program is distributed in the hope that it will be useful,         *
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
14  * GNU General Public License for more details.                            *
15  *                                                                         *
16  * You should have received a copy of the GNU General Public License       *
17  * along with this program; if not, write to the Free Software             *
18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
19  ***************************************************************************/
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/param.h>
25 #include <linux/moduleparam.h>
26 #include <linux/errno.h>
27 #include <linux/slab.h>
28 #include <linux/device.h>
29 #include <linux/fs.h>
30 #include <linux/delay.h>
31 #include <linux/compiler.h>
32 #include <linux/ioctl.h>
33 #include <linux/poll.h>
34 #include <linux/stat.h>
35 #include <linux/mm.h>
36 #include <linux/vmalloc.h>
37 #include <linux/page-flags.h>
38 #include <linux/byteorder/generic.h>
39 #include <asm/page.h>
40 #include <asm/uaccess.h>
41
42 #include "et61x251.h"
43
44 /*****************************************************************************/
45
46 #define ET61X251_MODULE_NAME    "V4L2 driver for ET61X[12]51 "                \
47                                 "PC Camera Controllers"
48 #define ET61X251_MODULE_AUTHOR  "(C) 2006 Luca Risolia"
49 #define ET61X251_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
50 #define ET61X251_MODULE_LICENSE "GPL"
51 #define ET61X251_MODULE_VERSION "1:1.02"
52 #define ET61X251_MODULE_VERSION_CODE  KERNEL_VERSION(1, 0, 2)
53
54 /*****************************************************************************/
55
56 MODULE_DEVICE_TABLE(usb, et61x251_id_table);
57
58 MODULE_AUTHOR(ET61X251_MODULE_AUTHOR " " ET61X251_AUTHOR_EMAIL);
59 MODULE_DESCRIPTION(ET61X251_MODULE_NAME);
60 MODULE_VERSION(ET61X251_MODULE_VERSION);
61 MODULE_LICENSE(ET61X251_MODULE_LICENSE);
62
63 static short video_nr[] = {[0 ... ET61X251_MAX_DEVICES-1] = -1};
64 module_param_array(video_nr, short, NULL, 0444);
65 MODULE_PARM_DESC(video_nr,
66                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
67                  "\n -1 = use next available (default)"
68                  "\n  n = use minor number n (integer >= 0)"
69                  "\nYou can specify up to "
70                  __MODULE_STRING(ET61X251_MAX_DEVICES) " cameras this way."
71                  "\nFor example:"
72                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
73                  "\nthe second registered camera and use auto for the first"
74                  "\none and for every other camera."
75                  "\n");
76
77 static short force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
78                                ET61X251_FORCE_MUNMAP};
79 module_param_array(force_munmap, bool, NULL, 0444);
80 MODULE_PARM_DESC(force_munmap,
81                  "\n<0|1[,...]> Force the application to unmap previously"
82                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
83                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
84                  "\nthis feature. This parameter is specific for each"
85                  "\ndetected camera."
86                  "\n 0 = do not force memory unmapping"
87                  "\n 1 = force memory unmapping (save memory)"
88                  "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
89                  "\n");
90
91 static unsigned int frame_timeout[] = {[0 ... ET61X251_MAX_DEVICES-1] =
92                                        ET61X251_FRAME_TIMEOUT};
93 module_param_array(frame_timeout, uint, NULL, 0644);
94 MODULE_PARM_DESC(frame_timeout,
95                  "\n<n[,...]> Timeout for a video frame in seconds."
96                  "\nThis parameter is specific for each detected camera."
97                  "\nDefault value is "
98                  __MODULE_STRING(ET61X251_FRAME_TIMEOUT)"."
99                  "\n");
100
101 #ifdef ET61X251_DEBUG
102 static unsigned short debug = ET61X251_DEBUG_LEVEL;
103 module_param(debug, ushort, 0644);
104 MODULE_PARM_DESC(debug,
105                  "\n<n> Debugging information level, from 0 to 3:"
106                  "\n0 = none (use carefully)"
107                  "\n1 = critical errors"
108                  "\n2 = significant informations"
109                  "\n3 = more verbose messages"
110                  "\nLevel 3 is useful for testing only, when only "
111                  "one device is used."
112                  "\nDefault value is "__MODULE_STRING(ET61X251_DEBUG_LEVEL)"."
113                  "\n");
114 #endif
115
116 /*****************************************************************************/
117
118 static u32
119 et61x251_request_buffers(struct et61x251_device* cam, u32 count,
120                          enum et61x251_io_method io)
121 {
122         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
123         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
124         const size_t imagesize = cam->module_param.force_munmap ||
125                                  io == IO_READ ?
126                                  (p->width * p->height * p->priv) / 8 :
127                                  (r->width * r->height * p->priv) / 8;
128         void* buff = NULL;
129         u32 i;
130
131         if (count > ET61X251_MAX_FRAMES)
132                 count = ET61X251_MAX_FRAMES;
133
134         cam->nbuffers = count;
135         while (cam->nbuffers > 0) {
136                 if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
137                         break;
138                 cam->nbuffers--;
139         }
140
141         for (i = 0; i < cam->nbuffers; i++) {
142                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
143                 cam->frame[i].buf.index = i;
144                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
145                 cam->frame[i].buf.length = imagesize;
146                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
147                 cam->frame[i].buf.sequence = 0;
148                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
149                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
150                 cam->frame[i].buf.flags = 0;
151         }
152
153         return cam->nbuffers;
154 }
155
156
157 static void et61x251_release_buffers(struct et61x251_device* cam)
158 {
159         if (cam->nbuffers) {
160                 vfree(cam->frame[0].bufmem);
161                 cam->nbuffers = 0;
162         }
163         cam->frame_current = NULL;
164 }
165
166
167 static void et61x251_empty_framequeues(struct et61x251_device* cam)
168 {
169         u32 i;
170
171         INIT_LIST_HEAD(&cam->inqueue);
172         INIT_LIST_HEAD(&cam->outqueue);
173
174         for (i = 0; i < ET61X251_MAX_FRAMES; i++) {
175                 cam->frame[i].state = F_UNUSED;
176                 cam->frame[i].buf.bytesused = 0;
177         }
178 }
179
180
181 static void et61x251_requeue_outqueue(struct et61x251_device* cam)
182 {
183         struct et61x251_frame_t *i;
184
185         list_for_each_entry(i, &cam->outqueue, frame) {
186                 i->state = F_QUEUED;
187                 list_add(&i->frame, &cam->inqueue);
188         }
189
190         INIT_LIST_HEAD(&cam->outqueue);
191 }
192
193
194 static void et61x251_queue_unusedframes(struct et61x251_device* cam)
195 {
196         unsigned long lock_flags;
197         u32 i;
198
199         for (i = 0; i < cam->nbuffers; i++)
200                 if (cam->frame[i].state == F_UNUSED) {
201                         cam->frame[i].state = F_QUEUED;
202                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
203                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
204                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
205                 }
206 }
207
208 /*****************************************************************************/
209
210 int et61x251_write_reg(struct et61x251_device* cam, u8 value, u16 index)
211 {
212         struct usb_device* udev = cam->usbdev;
213         u8* buff = cam->control_buffer;
214         int res;
215
216         *buff = value;
217
218         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
219                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
220         if (res < 0) {
221                 DBG(3, "Failed to write a register (value 0x%02X, index "
222                        "0x%02X, error %d)", value, index, res);
223                 return -1;
224         }
225
226         return 0;
227 }
228
229
230 int et61x251_read_reg(struct et61x251_device* cam, u16 index)
231 {
232         struct usb_device* udev = cam->usbdev;
233         u8* buff = cam->control_buffer;
234         int res;
235
236         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
237                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
238         if (res < 0)
239                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
240                     index, res);
241
242         return (res >= 0) ? (int)(*buff) : -1;
243 }
244
245
246 static int
247 et61x251_i2c_wait(struct et61x251_device* cam, struct et61x251_sensor* sensor)
248 {
249         int i, r;
250
251         for (i = 1; i <= 8; i++) {
252                 if (sensor->interface == ET61X251_I2C_3WIRES) {
253                         r = et61x251_read_reg(cam, 0x8e);
254                         if (!(r & 0x02) && (r >= 0))
255                                 return 0;
256                 } else {
257                         r = et61x251_read_reg(cam, 0x8b);
258                         if (!(r & 0x01) && (r >= 0))
259                                 return 0;
260                 }
261                 if (r < 0)
262                         return -EIO;
263                 udelay(8*8); /* minimum for sensors at 400kHz */
264         }
265
266         return -EBUSY;
267 }
268
269
270 int
271 et61x251_i2c_try_read(struct et61x251_device* cam,
272                       struct et61x251_sensor* sensor, u8 address)
273 {
274         struct usb_device* udev = cam->usbdev;
275         u8* data = cam->control_buffer;
276         int err = 0, res;
277
278         data[0] = address;
279         data[1] = cam->sensor.i2c_slave_id;
280         data[2] = cam->sensor.rsta | 0x10;
281         data[3] = !(et61x251_read_reg(cam, 0x8b) & 0x02);
282         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
283                               0, 0x88, data, 4, ET61X251_CTRL_TIMEOUT);
284         if (res < 0)
285                 err += res;
286
287         err += et61x251_i2c_wait(cam, sensor);
288
289         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
290                               0, 0x80, data, 8, ET61X251_CTRL_TIMEOUT);
291         if (res < 0)
292                 err += res;
293
294         if (err)
295                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
296
297         PDBGG("I2C read: address 0x%02X, value: 0x%02X", address, data[0]);
298
299         return err ? -1 : (int)data[0];
300 }
301
302
303 int
304 et61x251_i2c_try_write(struct et61x251_device* cam,
305                        struct et61x251_sensor* sensor, u8 address, u8 value)
306 {
307         struct usb_device* udev = cam->usbdev;
308         u8* data = cam->control_buffer;
309         int err = 0, res;
310
311         data[0] = address;
312         data[1] = cam->sensor.i2c_slave_id;
313         data[2] = cam->sensor.rsta | 0x12;
314         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
315                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
316         if (res < 0)
317                 err += res;
318
319         data[0] = value;
320         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
321                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
322         if (res < 0)
323                 err += res;
324
325         err += et61x251_i2c_wait(cam, sensor);
326
327         if (err)
328                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
329
330         PDBGG("I2C write: address 0x%02X, value: 0x%02X", address, value);
331
332         return err ? -1 : 0;
333 }
334
335
336 int
337 et61x251_i2c_raw_write(struct et61x251_device* cam, u8 n, u8 data1, u8 data2,
338                        u8 data3, u8 data4, u8 data5, u8 data6, u8 data7,
339                        u8 data8, u8 address)
340 {
341         struct usb_device* udev = cam->usbdev;
342         u8* data = cam->control_buffer;
343         int err = 0, res;
344
345         data[0] = data2;
346         data[1] = data3;
347         data[2] = data4;
348         data[3] = data5;
349         data[4] = data6;
350         data[5] = data7;
351         data[6] = data8;
352         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
353                               0, 0x81, data, n-1, ET61X251_CTRL_TIMEOUT);
354         if (res < 0)
355                 err += res;
356
357         data[0] = address;
358         data[1] = cam->sensor.i2c_slave_id;
359         data[2] = cam->sensor.rsta | 0x02 | (n << 4);
360         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
361                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
362         if (res < 0)
363                 err += res;
364
365         /* Start writing through the serial interface */
366         data[0] = data1;
367         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
368                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
369         if (res < 0)
370                 err += res;
371
372         err += et61x251_i2c_wait(cam, &cam->sensor);
373
374         if (err)
375                 DBG(3, "I2C raw write failed for %s image sensor",
376                     cam->sensor.name);
377
378         PDBGG("I2C raw write: %u bytes, address = 0x%02X, data1 = 0x%02X, "
379               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X,"
380               " data6 = 0x%02X, data7 = 0x%02X, data8 = 0x%02X", n, address,
381               data1, data2, data3, data4, data5, data6, data7, data8);
382
383         return err ? -1 : 0;
384
385 }
386
387
388 int et61x251_i2c_read(struct et61x251_device* cam, u8 address)
389 {
390         return et61x251_i2c_try_read(cam, &cam->sensor, address);
391 }
392
393
394 int et61x251_i2c_write(struct et61x251_device* cam, u8 address, u8 value)
395 {
396         return et61x251_i2c_try_write(cam, &cam->sensor, address, value);
397 }
398
399 /*****************************************************************************/
400
401 static void et61x251_urb_complete(struct urb *urb, struct pt_regs* regs)
402 {
403         struct et61x251_device* cam = urb->context;
404         struct et61x251_frame_t** f;
405         size_t imagesize;
406         u8 i;
407         int err = 0;
408
409         if (urb->status == -ENOENT)
410                 return;
411
412         f = &cam->frame_current;
413
414         if (cam->stream == STREAM_INTERRUPT) {
415                 cam->stream = STREAM_OFF;
416                 if ((*f))
417                         (*f)->state = F_QUEUED;
418                 DBG(3, "Stream interrupted");
419                 wake_up(&cam->wait_stream);
420         }
421
422         if (cam->state & DEV_DISCONNECTED)
423                 return;
424
425         if (cam->state & DEV_MISCONFIGURED) {
426                 wake_up_interruptible(&cam->wait_frame);
427                 return;
428         }
429
430         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
431                 goto resubmit_urb;
432
433         if (!(*f))
434                 (*f) = list_entry(cam->inqueue.next, struct et61x251_frame_t,
435                                   frame);
436
437         imagesize = (cam->sensor.pix_format.width *
438                      cam->sensor.pix_format.height *
439                      cam->sensor.pix_format.priv) / 8;
440
441         for (i = 0; i < urb->number_of_packets; i++) {
442                 unsigned int len, status;
443                 void *pos;
444                 u8* b1, * b2, sof;
445                 const u8 VOID_BYTES = 6;
446                 size_t imglen;
447
448                 len = urb->iso_frame_desc[i].actual_length;
449                 status = urb->iso_frame_desc[i].status;
450                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
451
452                 if (status) {
453                         DBG(3, "Error in isochronous frame");
454                         (*f)->state = F_ERROR;
455                         continue;
456                 }
457
458                 b1 = pos++;
459                 b2 = pos++;
460                 sof = ((*b1 & 0x3f) == 63);
461                 imglen = ((*b1 & 0xc0) << 2) | *b2;
462
463                 PDBGG("Isochrnous frame: length %u, #%u i, image length %zu",
464                       len, i, imglen);
465
466                 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
467 start_of_frame:
468                         if (sof) {
469                                 (*f)->state = F_GRABBING;
470                                 (*f)->buf.bytesused = 0;
471                                 do_gettimeofday(&(*f)->buf.timestamp);
472                                 pos += 22;
473                                 DBG(3, "SOF detected: new video frame");
474                         }
475
476                 if ((*f)->state == F_GRABBING) {
477                         if (sof && (*f)->buf.bytesused) {
478                                 if (cam->sensor.pix_format.pixelformat ==
479                                                          V4L2_PIX_FMT_ET61X251)
480                                         goto end_of_frame;
481                                 else {
482                                         DBG(3, "Not expected SOF detected "
483                                                "after %lu bytes",
484                                            (unsigned long)(*f)->buf.bytesused);
485                                         (*f)->state = F_ERROR;
486                                         continue;
487                                 }
488                         }
489
490                         if ((*f)->buf.bytesused + imglen > imagesize) {
491                                 DBG(3, "Video frame size exceeded");
492                                 (*f)->state = F_ERROR;
493                                 continue;
494                         }
495
496                         pos += VOID_BYTES;
497
498                         memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, imglen);
499                         (*f)->buf.bytesused += imglen;
500
501                         if ((*f)->buf.bytesused == imagesize) {
502                                 u32 b;
503 end_of_frame:
504                                 b = (*f)->buf.bytesused;
505                                 (*f)->state = F_DONE;
506                                 (*f)->buf.sequence= ++cam->frame_count;
507                                 spin_lock(&cam->queue_lock);
508                                 list_move_tail(&(*f)->frame, &cam->outqueue);
509                                 if (!list_empty(&cam->inqueue))
510                                         (*f) = list_entry(cam->inqueue.next,
511                                                        struct et61x251_frame_t,
512                                                           frame);
513                                 else
514                                         (*f) = NULL;
515                                 spin_unlock(&cam->queue_lock);
516                                 DBG(3, "Video frame captured: : %lu bytes",
517                                        (unsigned long)(b));
518
519                                 if (!(*f))
520                                         goto resubmit_urb;
521
522                                 if (sof &&
523                                     cam->sensor.pix_format.pixelformat ==
524                                                          V4L2_PIX_FMT_ET61X251)
525                                         goto start_of_frame;
526                         }
527                 }
528         }
529
530 resubmit_urb:
531         urb->dev = cam->usbdev;
532         err = usb_submit_urb(urb, GFP_ATOMIC);
533         if (err < 0 && err != -EPERM) {
534                 cam->state |= DEV_MISCONFIGURED;
535                 DBG(1, "usb_submit_urb() failed");
536         }
537
538         wake_up_interruptible(&cam->wait_frame);
539 }
540
541
542 static int et61x251_start_transfer(struct et61x251_device* cam)
543 {
544         struct usb_device *udev = cam->usbdev;
545         struct urb* urb;
546         const unsigned int wMaxPacketSize[] = {0, 256, 384, 512, 640, 768, 832,
547                                                864, 896, 920, 956, 980, 1000,
548                                                1022};
549         const unsigned int psz = wMaxPacketSize[ET61X251_ALTERNATE_SETTING];
550         s8 i, j;
551         int err = 0;
552
553         for (i = 0; i < ET61X251_URBS; i++) {
554                 cam->transfer_buffer[i] = kzalloc(ET61X251_ISO_PACKETS * psz,
555                                                   GFP_KERNEL);
556                 if (!cam->transfer_buffer[i]) {
557                         err = -ENOMEM;
558                         DBG(1, "Not enough memory");
559                         goto free_buffers;
560                 }
561         }
562
563         for (i = 0; i < ET61X251_URBS; i++) {
564                 urb = usb_alloc_urb(ET61X251_ISO_PACKETS, GFP_KERNEL);
565                 cam->urb[i] = urb;
566                 if (!urb) {
567                         err = -ENOMEM;
568                         DBG(1, "usb_alloc_urb() failed");
569                         goto free_urbs;
570                 }
571                 urb->dev = udev;
572                 urb->context = cam;
573                 urb->pipe = usb_rcvisocpipe(udev, 1);
574                 urb->transfer_flags = URB_ISO_ASAP;
575                 urb->number_of_packets = ET61X251_ISO_PACKETS;
576                 urb->complete = et61x251_urb_complete;
577                 urb->transfer_buffer = cam->transfer_buffer[i];
578                 urb->transfer_buffer_length = psz * ET61X251_ISO_PACKETS;
579                 urb->interval = 1;
580                 for (j = 0; j < ET61X251_ISO_PACKETS; j++) {
581                         urb->iso_frame_desc[j].offset = psz * j;
582                         urb->iso_frame_desc[j].length = psz;
583                 }
584         }
585
586         err = et61x251_write_reg(cam, 0x01, 0x03);
587         err = et61x251_write_reg(cam, 0x00, 0x03);
588         err = et61x251_write_reg(cam, 0x08, 0x03);
589         if (err) {
590                 err = -EIO;
591                 DBG(1, "I/O hardware error");
592                 goto free_urbs;
593         }
594
595         err = usb_set_interface(udev, 0, ET61X251_ALTERNATE_SETTING);
596         if (err) {
597                 DBG(1, "usb_set_interface() failed");
598                 goto free_urbs;
599         }
600
601         cam->frame_current = NULL;
602
603         for (i = 0; i < ET61X251_URBS; i++) {
604                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
605                 if (err) {
606                         for (j = i-1; j >= 0; j--)
607                                 usb_kill_urb(cam->urb[j]);
608                         DBG(1, "usb_submit_urb() failed, error %d", err);
609                         goto free_urbs;
610                 }
611         }
612
613         return 0;
614
615 free_urbs:
616         for (i = 0; (i < ET61X251_URBS) &&  cam->urb[i]; i++)
617                 usb_free_urb(cam->urb[i]);
618
619 free_buffers:
620         for (i = 0; (i < ET61X251_URBS) && cam->transfer_buffer[i]; i++)
621                 kfree(cam->transfer_buffer[i]);
622
623         return err;
624 }
625
626
627 static int et61x251_stop_transfer(struct et61x251_device* cam)
628 {
629         struct usb_device *udev = cam->usbdev;
630         s8 i;
631         int err = 0;
632
633         if (cam->state & DEV_DISCONNECTED)
634                 return 0;
635
636         for (i = ET61X251_URBS-1; i >= 0; i--) {
637                 usb_kill_urb(cam->urb[i]);
638                 usb_free_urb(cam->urb[i]);
639                 kfree(cam->transfer_buffer[i]);
640         }
641
642         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
643         if (err)
644                 DBG(3, "usb_set_interface() failed");
645
646         return err;
647 }
648
649
650 static int et61x251_stream_interrupt(struct et61x251_device* cam)
651 {
652         long timeout;
653
654         cam->stream = STREAM_INTERRUPT;
655         timeout = wait_event_timeout(cam->wait_stream,
656                                      (cam->stream == STREAM_OFF) ||
657                                      (cam->state & DEV_DISCONNECTED),
658                                      ET61X251_URB_TIMEOUT);
659         if (cam->state & DEV_DISCONNECTED)
660                 return -ENODEV;
661         else if (cam->stream != STREAM_OFF) {
662                 cam->state |= DEV_MISCONFIGURED;
663                 DBG(1, "URB timeout reached. The camera is misconfigured. To "
664                        "use it, close and open /dev/video%d again.",
665                     cam->v4ldev->minor);
666                 return -EIO;
667         }
668
669         return 0;
670 }
671
672 /*****************************************************************************/
673
674 #ifdef CONFIG_VIDEO_ADV_DEBUG
675 static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
676 {
677         char str[5];
678         char* endp;
679         unsigned long val;
680
681         if (len < 4) {
682                 strncpy(str, buff, len);
683                 str[len+1] = '\0';
684         } else {
685                 strncpy(str, buff, 4);
686                 str[4] = '\0';
687         }
688
689         val = simple_strtoul(str, &endp, 0);
690
691         *count = 0;
692         if (val <= 0xff)
693                 *count = (ssize_t)(endp - str);
694         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
695                 *count += 1;
696
697         return (u8)val;
698 }
699
700 /*
701    NOTE 1: being inside one of the following methods implies that the v4l
702            device exists for sure (see kobjects and reference counters)
703    NOTE 2: buffers are PAGE_SIZE long
704 */
705
706 static ssize_t et61x251_show_reg(struct class_device* cd, char* buf)
707 {
708         struct et61x251_device* cam;
709         ssize_t count;
710
711         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
712                 return -ERESTARTSYS;
713
714         cam = video_get_drvdata(to_video_device(cd));
715         if (!cam) {
716                 mutex_unlock(&et61x251_sysfs_lock);
717                 return -ENODEV;
718         }
719
720         count = sprintf(buf, "%u\n", cam->sysfs.reg);
721
722         mutex_unlock(&et61x251_sysfs_lock);
723
724         return count;
725 }
726
727
728 static ssize_t
729 et61x251_store_reg(struct class_device* cd, const char* buf, size_t len)
730 {
731         struct et61x251_device* cam;
732         u8 index;
733         ssize_t count;
734
735         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
736                 return -ERESTARTSYS;
737
738         cam = video_get_drvdata(to_video_device(cd));
739         if (!cam) {
740                 mutex_unlock(&et61x251_sysfs_lock);
741                 return -ENODEV;
742         }
743
744         index = et61x251_strtou8(buf, len, &count);
745         if (index > 0x8e || !count) {
746                 mutex_unlock(&et61x251_sysfs_lock);
747                 return -EINVAL;
748         }
749
750         cam->sysfs.reg = index;
751
752         DBG(2, "Moved ET61X[12]51 register index to 0x%02X", cam->sysfs.reg);
753         DBG(3, "Written bytes: %zd", count);
754
755         mutex_unlock(&et61x251_sysfs_lock);
756
757         return count;
758 }
759
760
761 static ssize_t et61x251_show_val(struct class_device* cd, char* buf)
762 {
763         struct et61x251_device* cam;
764         ssize_t count;
765         int val;
766
767         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
768                 return -ERESTARTSYS;
769
770         cam = video_get_drvdata(to_video_device(cd));
771         if (!cam) {
772                 mutex_unlock(&et61x251_sysfs_lock);
773                 return -ENODEV;
774         }
775
776         if ((val = et61x251_read_reg(cam, cam->sysfs.reg)) < 0) {
777                 mutex_unlock(&et61x251_sysfs_lock);
778                 return -EIO;
779         }
780
781         count = sprintf(buf, "%d\n", val);
782
783         DBG(3, "Read bytes: %zd", count);
784
785         mutex_unlock(&et61x251_sysfs_lock);
786
787         return count;
788 }
789
790
791 static ssize_t
792 et61x251_store_val(struct class_device* cd, const char* buf, size_t len)
793 {
794         struct et61x251_device* cam;
795         u8 value;
796         ssize_t count;
797         int err;
798
799         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
800                 return -ERESTARTSYS;
801
802         cam = video_get_drvdata(to_video_device(cd));
803         if (!cam) {
804                 mutex_unlock(&et61x251_sysfs_lock);
805                 return -ENODEV;
806         }
807
808         value = et61x251_strtou8(buf, len, &count);
809         if (!count) {
810                 mutex_unlock(&et61x251_sysfs_lock);
811                 return -EINVAL;
812         }
813
814         err = et61x251_write_reg(cam, value, cam->sysfs.reg);
815         if (err) {
816                 mutex_unlock(&et61x251_sysfs_lock);
817                 return -EIO;
818         }
819
820         DBG(2, "Written ET61X[12]51 reg. 0x%02X, val. 0x%02X",
821             cam->sysfs.reg, value);
822         DBG(3, "Written bytes: %zd", count);
823
824         mutex_unlock(&et61x251_sysfs_lock);
825
826         return count;
827 }
828
829
830 static ssize_t et61x251_show_i2c_reg(struct class_device* cd, char* buf)
831 {
832         struct et61x251_device* cam;
833         ssize_t count;
834
835         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
836                 return -ERESTARTSYS;
837
838         cam = video_get_drvdata(to_video_device(cd));
839         if (!cam) {
840                 mutex_unlock(&et61x251_sysfs_lock);
841                 return -ENODEV;
842         }
843
844         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
845
846         DBG(3, "Read bytes: %zd", count);
847
848         mutex_unlock(&et61x251_sysfs_lock);
849
850         return count;
851 }
852
853
854 static ssize_t
855 et61x251_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
856 {
857         struct et61x251_device* cam;
858         u8 index;
859         ssize_t count;
860
861         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
862                 return -ERESTARTSYS;
863
864         cam = video_get_drvdata(to_video_device(cd));
865         if (!cam) {
866                 mutex_unlock(&et61x251_sysfs_lock);
867                 return -ENODEV;
868         }
869
870         index = et61x251_strtou8(buf, len, &count);
871         if (!count) {
872                 mutex_unlock(&et61x251_sysfs_lock);
873                 return -EINVAL;
874         }
875
876         cam->sysfs.i2c_reg = index;
877
878         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
879         DBG(3, "Written bytes: %zd", count);
880
881         mutex_unlock(&et61x251_sysfs_lock);
882
883         return count;
884 }
885
886
887 static ssize_t et61x251_show_i2c_val(struct class_device* cd, char* buf)
888 {
889         struct et61x251_device* cam;
890         ssize_t count;
891         int val;
892
893         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
894                 return -ERESTARTSYS;
895
896         cam = video_get_drvdata(to_video_device(cd));
897         if (!cam) {
898                 mutex_unlock(&et61x251_sysfs_lock);
899                 return -ENODEV;
900         }
901
902         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
903                 mutex_unlock(&et61x251_sysfs_lock);
904                 return -ENOSYS;
905         }
906
907         if ((val = et61x251_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
908                 mutex_unlock(&et61x251_sysfs_lock);
909                 return -EIO;
910         }
911
912         count = sprintf(buf, "%d\n", val);
913
914         DBG(3, "Read bytes: %zd", count);
915
916         mutex_unlock(&et61x251_sysfs_lock);
917
918         return count;
919 }
920
921
922 static ssize_t
923 et61x251_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
924 {
925         struct et61x251_device* cam;
926         u8 value;
927         ssize_t count;
928         int err;
929
930         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
931                 return -ERESTARTSYS;
932
933         cam = video_get_drvdata(to_video_device(cd));
934         if (!cam) {
935                 mutex_unlock(&et61x251_sysfs_lock);
936                 return -ENODEV;
937         }
938
939         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
940                 mutex_unlock(&et61x251_sysfs_lock);
941                 return -ENOSYS;
942         }
943
944         value = et61x251_strtou8(buf, len, &count);
945         if (!count) {
946                 mutex_unlock(&et61x251_sysfs_lock);
947                 return -EINVAL;
948         }
949
950         err = et61x251_i2c_write(cam, cam->sysfs.i2c_reg, value);
951         if (err) {
952                 mutex_unlock(&et61x251_sysfs_lock);
953                 return -EIO;
954         }
955
956         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
957             cam->sysfs.i2c_reg, value);
958         DBG(3, "Written bytes: %zd", count);
959
960         mutex_unlock(&et61x251_sysfs_lock);
961
962         return count;
963 }
964
965
966 static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
967                          et61x251_show_reg, et61x251_store_reg);
968 static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
969                          et61x251_show_val, et61x251_store_val);
970 static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
971                          et61x251_show_i2c_reg, et61x251_store_i2c_reg);
972 static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
973                          et61x251_show_i2c_val, et61x251_store_i2c_val);
974
975
976 static void et61x251_create_sysfs(struct et61x251_device* cam)
977 {
978         struct video_device *v4ldev = cam->v4ldev;
979
980         video_device_create_file(v4ldev, &class_device_attr_reg);
981         video_device_create_file(v4ldev, &class_device_attr_val);
982         if (cam->sensor.sysfs_ops) {
983                 video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
984                 video_device_create_file(v4ldev, &class_device_attr_i2c_val);
985         }
986 }
987 #endif /* CONFIG_VIDEO_ADV_DEBUG */
988
989 /*****************************************************************************/
990
991 static int
992 et61x251_set_pix_format(struct et61x251_device* cam,
993                         struct v4l2_pix_format* pix)
994 {
995         int r, err = 0;
996
997         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
998                 err += r;
999         if (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1000                 err += et61x251_write_reg(cam, r & 0xfd, 0x12);
1001         else
1002                 err += et61x251_write_reg(cam, r | 0x02, 0x12);
1003
1004         return err ? -EIO : 0;
1005 }
1006
1007
1008 static int
1009 et61x251_set_compression(struct et61x251_device* cam,
1010                          struct v4l2_jpegcompression* compression)
1011 {
1012         int r, err = 0;
1013
1014         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1015                 err += r;
1016         if (compression->quality == 0)
1017                 err += et61x251_write_reg(cam, r & 0xfb, 0x12);
1018         else
1019                 err += et61x251_write_reg(cam, r | 0x04, 0x12);
1020
1021         return err ? -EIO : 0;
1022 }
1023
1024
1025 static int et61x251_set_scale(struct et61x251_device* cam, u8 scale)
1026 {
1027         int r = 0, err = 0;
1028
1029         r = et61x251_read_reg(cam, 0x12);
1030         if (r < 0)
1031                 err += r;
1032
1033         if (scale == 1)
1034                 err += et61x251_write_reg(cam, r & ~0x01, 0x12);
1035         else if (scale == 2)
1036                 err += et61x251_write_reg(cam, r | 0x01, 0x12);
1037
1038         if (err)
1039                 return -EIO;
1040
1041         PDBGG("Scaling factor: %u", scale);
1042
1043         return 0;
1044 }
1045
1046
1047 static int
1048 et61x251_set_crop(struct et61x251_device* cam, struct v4l2_rect* rect)
1049 {
1050         struct et61x251_sensor* s = &cam->sensor;
1051         u16 fmw_sx = (u16)(rect->left - s->cropcap.bounds.left +
1052                            s->active_pixel.left),
1053             fmw_sy = (u16)(rect->top - s->cropcap.bounds.top +
1054                            s->active_pixel.top),
1055             fmw_length = (u16)(rect->width),
1056             fmw_height = (u16)(rect->height);
1057         int err = 0;
1058
1059         err += et61x251_write_reg(cam, fmw_sx & 0xff, 0x69);
1060         err += et61x251_write_reg(cam, fmw_sy & 0xff, 0x6a);
1061         err += et61x251_write_reg(cam, fmw_length & 0xff, 0x6b);
1062         err += et61x251_write_reg(cam, fmw_height & 0xff, 0x6c);
1063         err += et61x251_write_reg(cam, (fmw_sx >> 8) | ((fmw_sy & 0x300) >> 6)
1064                                        | ((fmw_length & 0x300) >> 4)
1065                                        | ((fmw_height & 0x300) >> 2), 0x6d);
1066         if (err)
1067                 return -EIO;
1068
1069         PDBGG("fmw_sx, fmw_sy, fmw_length, fmw_height: %u %u %u %u",
1070               fmw_sx, fmw_sy, fmw_length, fmw_height);
1071
1072         return 0;
1073 }
1074
1075
1076 static int et61x251_init(struct et61x251_device* cam)
1077 {
1078         struct et61x251_sensor* s = &cam->sensor;
1079         struct v4l2_control ctrl;
1080         struct v4l2_queryctrl *qctrl;
1081         struct v4l2_rect* rect;
1082         u8 i = 0;
1083         int err = 0;
1084
1085         if (!(cam->state & DEV_INITIALIZED)) {
1086                 init_waitqueue_head(&cam->open);
1087                 qctrl = s->qctrl;
1088                 rect = &(s->cropcap.defrect);
1089                 cam->compression.quality = ET61X251_COMPRESSION_QUALITY;
1090         } else { /* use current values */
1091                 qctrl = s->_qctrl;
1092                 rect = &(s->_rect);
1093         }
1094
1095         err += et61x251_set_scale(cam, rect->width / s->pix_format.width);
1096         err += et61x251_set_crop(cam, rect);
1097         if (err)
1098                 return err;
1099
1100         if (s->init) {
1101                 err = s->init(cam);
1102                 if (err) {
1103                         DBG(3, "Sensor initialization failed");
1104                         return err;
1105                 }
1106         }
1107
1108         err += et61x251_set_compression(cam, &cam->compression);
1109         err += et61x251_set_pix_format(cam, &s->pix_format);
1110         if (s->set_pix_format)
1111                 err += s->set_pix_format(cam, &s->pix_format);
1112         if (err)
1113                 return err;
1114
1115         if (s->pix_format.pixelformat == V4L2_PIX_FMT_ET61X251)
1116                 DBG(3, "Compressed video format is active, quality %d",
1117                     cam->compression.quality);
1118         else
1119                 DBG(3, "Uncompressed video format is active");
1120
1121         if (s->set_crop)
1122                 if ((err = s->set_crop(cam, rect))) {
1123                         DBG(3, "set_crop() failed");
1124                         return err;
1125                 }
1126
1127         if (s->set_ctrl) {
1128                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1129                         if (s->qctrl[i].id != 0 &&
1130                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1131                                 ctrl.id = s->qctrl[i].id;
1132                                 ctrl.value = qctrl[i].default_value;
1133                                 err = s->set_ctrl(cam, &ctrl);
1134                                 if (err) {
1135                                         DBG(3, "Set %s control failed",
1136                                             s->qctrl[i].name);
1137                                         return err;
1138                                 }
1139                                 DBG(3, "Image sensor supports '%s' control",
1140                                     s->qctrl[i].name);
1141                         }
1142         }
1143
1144         if (!(cam->state & DEV_INITIALIZED)) {
1145                 mutex_init(&cam->fileop_mutex);
1146                 spin_lock_init(&cam->queue_lock);
1147                 init_waitqueue_head(&cam->wait_frame);
1148                 init_waitqueue_head(&cam->wait_stream);
1149                 cam->nreadbuffers = 2;
1150                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1151                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1152                        sizeof(struct v4l2_rect));
1153                 cam->state |= DEV_INITIALIZED;
1154         }
1155
1156         DBG(2, "Initialization succeeded");
1157         return 0;
1158 }
1159
1160
1161 static void et61x251_release_resources(struct et61x251_device* cam)
1162 {
1163         mutex_lock(&et61x251_sysfs_lock);
1164
1165         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
1166         video_set_drvdata(cam->v4ldev, NULL);
1167         video_unregister_device(cam->v4ldev);
1168
1169         usb_put_dev(cam->usbdev);
1170
1171         mutex_unlock(&et61x251_sysfs_lock);
1172
1173         kfree(cam->control_buffer);
1174 }
1175
1176 /*****************************************************************************/
1177
1178 static int et61x251_open(struct inode* inode, struct file* filp)
1179 {
1180         struct et61x251_device* cam;
1181         int err = 0;
1182
1183         /*
1184            This is the only safe way to prevent race conditions with
1185            disconnect
1186         */
1187         if (!down_read_trylock(&et61x251_disconnect))
1188                 return -ERESTARTSYS;
1189
1190         cam = video_get_drvdata(video_devdata(filp));
1191
1192         if (mutex_lock_interruptible(&cam->dev_mutex)) {
1193                 up_read(&et61x251_disconnect);
1194                 return -ERESTARTSYS;
1195         }
1196
1197         if (cam->users) {
1198                 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
1199                 if ((filp->f_flags & O_NONBLOCK) ||
1200                     (filp->f_flags & O_NDELAY)) {
1201                         err = -EWOULDBLOCK;
1202                         goto out;
1203                 }
1204                 mutex_unlock(&cam->dev_mutex);
1205                 err = wait_event_interruptible_exclusive(cam->open,
1206                                                   cam->state & DEV_DISCONNECTED
1207                                                          || !cam->users);
1208                 if (err) {
1209                         up_read(&et61x251_disconnect);
1210                         return err;
1211                 }
1212                 if (cam->state & DEV_DISCONNECTED) {
1213                         up_read(&et61x251_disconnect);
1214                         return -ENODEV;
1215                 }
1216                 mutex_lock(&cam->dev_mutex);
1217         }
1218
1219
1220         if (cam->state & DEV_MISCONFIGURED) {
1221                 err = et61x251_init(cam);
1222                 if (err) {
1223                         DBG(1, "Initialization failed again. "
1224                                "I will retry on next open().");
1225                         goto out;
1226                 }
1227                 cam->state &= ~DEV_MISCONFIGURED;
1228         }
1229
1230         if ((err = et61x251_start_transfer(cam)))
1231                 goto out;
1232
1233         filp->private_data = cam;
1234         cam->users++;
1235         cam->io = IO_NONE;
1236         cam->stream = STREAM_OFF;
1237         cam->nbuffers = 0;
1238         cam->frame_count = 0;
1239         et61x251_empty_framequeues(cam);
1240
1241         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
1242
1243 out:
1244         mutex_unlock(&cam->dev_mutex);
1245         up_read(&et61x251_disconnect);
1246         return err;
1247 }
1248
1249
1250 static int et61x251_release(struct inode* inode, struct file* filp)
1251 {
1252         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1253
1254         mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
1255
1256         et61x251_stop_transfer(cam);
1257
1258         et61x251_release_buffers(cam);
1259
1260         if (cam->state & DEV_DISCONNECTED) {
1261                 et61x251_release_resources(cam);
1262                 mutex_unlock(&cam->dev_mutex);
1263                 kfree(cam);
1264                 return 0;
1265         }
1266
1267         cam->users--;
1268         wake_up_interruptible_nr(&cam->open, 1);
1269
1270         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
1271
1272         mutex_unlock(&cam->dev_mutex);
1273
1274         return 0;
1275 }
1276
1277
1278 static ssize_t
1279 et61x251_read(struct file* filp, char __user * buf,
1280               size_t count, loff_t* f_pos)
1281 {
1282         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1283         struct et61x251_frame_t* f, * i;
1284         unsigned long lock_flags;
1285         long timeout;
1286         int err = 0;
1287
1288         if (mutex_lock_interruptible(&cam->fileop_mutex))
1289                 return -ERESTARTSYS;
1290
1291         if (cam->state & DEV_DISCONNECTED) {
1292                 DBG(1, "Device not present");
1293                 mutex_unlock(&cam->fileop_mutex);
1294                 return -ENODEV;
1295         }
1296
1297         if (cam->state & DEV_MISCONFIGURED) {
1298                 DBG(1, "The camera is misconfigured. Close and open it "
1299                        "again.");
1300                 mutex_unlock(&cam->fileop_mutex);
1301                 return -EIO;
1302         }
1303
1304         if (cam->io == IO_MMAP) {
1305                 DBG(3, "Close and open the device again to choose the read "
1306                        "method");
1307                 mutex_unlock(&cam->fileop_mutex);
1308                 return -EINVAL;
1309         }
1310
1311         if (cam->io == IO_NONE) {
1312                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1313                                               IO_READ)) {
1314                         DBG(1, "read() failed, not enough memory");
1315                         mutex_unlock(&cam->fileop_mutex);
1316                         return -ENOMEM;
1317                 }
1318                 cam->io = IO_READ;
1319                 cam->stream = STREAM_ON;
1320         }
1321
1322         if (list_empty(&cam->inqueue)) {
1323                 if (!list_empty(&cam->outqueue))
1324                         et61x251_empty_framequeues(cam);
1325                 et61x251_queue_unusedframes(cam);
1326         }
1327
1328         if (!count) {
1329                 mutex_unlock(&cam->fileop_mutex);
1330                 return 0;
1331         }
1332
1333         if (list_empty(&cam->outqueue)) {
1334                 if (filp->f_flags & O_NONBLOCK) {
1335                         mutex_unlock(&cam->fileop_mutex);
1336                         return -EAGAIN;
1337                 }
1338                 timeout = wait_event_interruptible_timeout
1339                           ( cam->wait_frame,
1340                             (!list_empty(&cam->outqueue)) ||
1341                             (cam->state & DEV_DISCONNECTED) ||
1342                             (cam->state & DEV_MISCONFIGURED),
1343                             cam->module_param.frame_timeout *
1344                             1000 * msecs_to_jiffies(1) );
1345                 if (timeout < 0) {
1346                         mutex_unlock(&cam->fileop_mutex);
1347                         return timeout;
1348                 }
1349                 if (cam->state & DEV_DISCONNECTED) {
1350                         mutex_unlock(&cam->fileop_mutex);
1351                         return -ENODEV;
1352                 }
1353                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1354                         mutex_unlock(&cam->fileop_mutex);
1355                         return -EIO;
1356                 }
1357         }
1358
1359         f = list_entry(cam->outqueue.prev, struct et61x251_frame_t, frame);
1360
1361         if (count > f->buf.bytesused)
1362                 count = f->buf.bytesused;
1363
1364         if (copy_to_user(buf, f->bufmem, count)) {
1365                 err = -EFAULT;
1366                 goto exit;
1367         }
1368         *f_pos += count;
1369
1370 exit:
1371         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1372         list_for_each_entry(i, &cam->outqueue, frame)
1373                 i->state = F_UNUSED;
1374         INIT_LIST_HEAD(&cam->outqueue);
1375         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1376
1377         et61x251_queue_unusedframes(cam);
1378
1379         PDBGG("Frame #%lu, bytes read: %zu",
1380               (unsigned long)f->buf.index, count);
1381
1382         mutex_unlock(&cam->fileop_mutex);
1383
1384         return err ? err : count;
1385 }
1386
1387
1388 static unsigned int et61x251_poll(struct file *filp, poll_table *wait)
1389 {
1390         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1391         struct et61x251_frame_t* f;
1392         unsigned long lock_flags;
1393         unsigned int mask = 0;
1394
1395         if (mutex_lock_interruptible(&cam->fileop_mutex))
1396                 return POLLERR;
1397
1398         if (cam->state & DEV_DISCONNECTED) {
1399                 DBG(1, "Device not present");
1400                 goto error;
1401         }
1402
1403         if (cam->state & DEV_MISCONFIGURED) {
1404                 DBG(1, "The camera is misconfigured. Close and open it "
1405                        "again.");
1406                 goto error;
1407         }
1408
1409         if (cam->io == IO_NONE) {
1410                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1411                                               IO_READ)) {
1412                         DBG(1, "poll() failed, not enough memory");
1413                         goto error;
1414                 }
1415                 cam->io = IO_READ;
1416                 cam->stream = STREAM_ON;
1417         }
1418
1419         if (cam->io == IO_READ) {
1420                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1421                 list_for_each_entry(f, &cam->outqueue, frame)
1422                         f->state = F_UNUSED;
1423                 INIT_LIST_HEAD(&cam->outqueue);
1424                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1425                 et61x251_queue_unusedframes(cam);
1426         }
1427
1428         poll_wait(filp, &cam->wait_frame, wait);
1429
1430         if (!list_empty(&cam->outqueue))
1431                 mask |= POLLIN | POLLRDNORM;
1432
1433         mutex_unlock(&cam->fileop_mutex);
1434
1435         return mask;
1436
1437 error:
1438         mutex_unlock(&cam->fileop_mutex);
1439         return POLLERR;
1440 }
1441
1442
1443 static void et61x251_vm_open(struct vm_area_struct* vma)
1444 {
1445         struct et61x251_frame_t* f = vma->vm_private_data;
1446         f->vma_use_count++;
1447 }
1448
1449
1450 static void et61x251_vm_close(struct vm_area_struct* vma)
1451 {
1452         /* NOTE: buffers are not freed here */
1453         struct et61x251_frame_t* f = vma->vm_private_data;
1454         f->vma_use_count--;
1455 }
1456
1457
1458 static struct vm_operations_struct et61x251_vm_ops = {
1459         .open = et61x251_vm_open,
1460         .close = et61x251_vm_close,
1461 };
1462
1463
1464 static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
1465 {
1466         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1467         unsigned long size = vma->vm_end - vma->vm_start,
1468                       start = vma->vm_start;
1469         void *pos;
1470         u32 i;
1471
1472         if (mutex_lock_interruptible(&cam->fileop_mutex))
1473                 return -ERESTARTSYS;
1474
1475         if (cam->state & DEV_DISCONNECTED) {
1476                 DBG(1, "Device not present");
1477                 mutex_unlock(&cam->fileop_mutex);
1478                 return -ENODEV;
1479         }
1480
1481         if (cam->state & DEV_MISCONFIGURED) {
1482                 DBG(1, "The camera is misconfigured. Close and open it "
1483                        "again.");
1484                 mutex_unlock(&cam->fileop_mutex);
1485                 return -EIO;
1486         }
1487
1488         if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
1489             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1490                 mutex_unlock(&cam->fileop_mutex);
1491                 return -EINVAL;
1492         }
1493
1494         for (i = 0; i < cam->nbuffers; i++) {
1495                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1496                         break;
1497         }
1498         if (i == cam->nbuffers) {
1499                 mutex_unlock(&cam->fileop_mutex);
1500                 return -EINVAL;
1501         }
1502
1503         vma->vm_flags |= VM_IO;
1504         vma->vm_flags |= VM_RESERVED;
1505
1506         pos = cam->frame[i].bufmem;
1507         while (size > 0) { /* size is page-aligned */
1508                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1509                         mutex_unlock(&cam->fileop_mutex);
1510                         return -EAGAIN;
1511                 }
1512                 start += PAGE_SIZE;
1513                 pos += PAGE_SIZE;
1514                 size -= PAGE_SIZE;
1515         }
1516
1517         vma->vm_ops = &et61x251_vm_ops;
1518         vma->vm_private_data = &cam->frame[i];
1519
1520         et61x251_vm_open(vma);
1521
1522         mutex_unlock(&cam->fileop_mutex);
1523
1524         return 0;
1525 }
1526
1527 /*****************************************************************************/
1528
1529 static int
1530 et61x251_vidioc_querycap(struct et61x251_device* cam, void __user * arg)
1531 {
1532         struct v4l2_capability cap = {
1533                 .driver = "et61x251",
1534                 .version = ET61X251_MODULE_VERSION_CODE,
1535                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1536                                 V4L2_CAP_STREAMING,
1537         };
1538
1539         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1540         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1541                 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1542                         sizeof(cap.bus_info));
1543
1544         if (copy_to_user(arg, &cap, sizeof(cap)))
1545                 return -EFAULT;
1546
1547         return 0;
1548 }
1549
1550
1551 static int
1552 et61x251_vidioc_enuminput(struct et61x251_device* cam, void __user * arg)
1553 {
1554         struct v4l2_input i;
1555
1556         if (copy_from_user(&i, arg, sizeof(i)))
1557                 return -EFAULT;
1558
1559         if (i.index)
1560                 return -EINVAL;
1561
1562         memset(&i, 0, sizeof(i));
1563         strcpy(i.name, "Camera");
1564         i.type = V4L2_INPUT_TYPE_CAMERA;
1565
1566         if (copy_to_user(arg, &i, sizeof(i)))
1567                 return -EFAULT;
1568
1569         return 0;
1570 }
1571
1572
1573 static int
1574 et61x251_vidioc_g_input(struct et61x251_device* cam, void __user * arg)
1575 {
1576         int index = 0;
1577
1578         if (copy_to_user(arg, &index, sizeof(index)))
1579                 return -EFAULT;
1580
1581         return 0;
1582 }
1583
1584
1585 static int
1586 et61x251_vidioc_s_input(struct et61x251_device* cam, void __user * arg)
1587 {
1588         int index;
1589
1590         if (copy_from_user(&index, arg, sizeof(index)))
1591                 return -EFAULT;
1592
1593         if (index != 0)
1594                 return -EINVAL;
1595
1596         return 0;
1597 }
1598
1599
1600 static int
1601 et61x251_vidioc_query_ctrl(struct et61x251_device* cam, void __user * arg)
1602 {
1603         struct et61x251_sensor* s = &cam->sensor;
1604         struct v4l2_queryctrl qc;
1605         u8 i;
1606
1607         if (copy_from_user(&qc, arg, sizeof(qc)))
1608                 return -EFAULT;
1609
1610         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1611                 if (qc.id && qc.id == s->qctrl[i].id) {
1612                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1613                         if (copy_to_user(arg, &qc, sizeof(qc)))
1614                                 return -EFAULT;
1615                         return 0;
1616                 }
1617
1618         return -EINVAL;
1619 }
1620
1621
1622 static int
1623 et61x251_vidioc_g_ctrl(struct et61x251_device* cam, void __user * arg)
1624 {
1625         struct et61x251_sensor* s = &cam->sensor;
1626         struct v4l2_control ctrl;
1627         int err = 0;
1628         u8 i;
1629
1630         if (!s->get_ctrl && !s->set_ctrl)
1631                 return -EINVAL;
1632
1633         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1634                 return -EFAULT;
1635
1636         if (!s->get_ctrl) {
1637                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1638                         if (ctrl.id == s->qctrl[i].id) {
1639                                 ctrl.value = s->_qctrl[i].default_value;
1640                                 goto exit;
1641                         }
1642                 return -EINVAL;
1643         } else
1644                 err = s->get_ctrl(cam, &ctrl);
1645
1646 exit:
1647         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1648                 return -EFAULT;
1649
1650         return err;
1651 }
1652
1653
1654 static int
1655 et61x251_vidioc_s_ctrl(struct et61x251_device* cam, void __user * arg)
1656 {
1657         struct et61x251_sensor* s = &cam->sensor;
1658         struct v4l2_control ctrl;
1659         u8 i;
1660         int err = 0;
1661
1662         if (!s->set_ctrl)
1663                 return -EINVAL;
1664
1665         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1666                 return -EFAULT;
1667
1668         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1669                 if (ctrl.id == s->qctrl[i].id) {
1670                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1671                                 return -EINVAL;
1672                         if (ctrl.value < s->qctrl[i].minimum ||
1673                             ctrl.value > s->qctrl[i].maximum)
1674                                 return -ERANGE;
1675                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1676                         break;
1677                 }
1678
1679         if ((err = s->set_ctrl(cam, &ctrl)))
1680                 return err;
1681
1682         s->_qctrl[i].default_value = ctrl.value;
1683
1684         return 0;
1685 }
1686
1687
1688 static int
1689 et61x251_vidioc_cropcap(struct et61x251_device* cam, void __user * arg)
1690 {
1691         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1692
1693         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1694         cc->pixelaspect.numerator = 1;
1695         cc->pixelaspect.denominator = 1;
1696
1697         if (copy_to_user(arg, cc, sizeof(*cc)))
1698                 return -EFAULT;
1699
1700         return 0;
1701 }
1702
1703
1704 static int
1705 et61x251_vidioc_g_crop(struct et61x251_device* cam, void __user * arg)
1706 {
1707         struct et61x251_sensor* s = &cam->sensor;
1708         struct v4l2_crop crop = {
1709                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1710         };
1711
1712         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1713
1714         if (copy_to_user(arg, &crop, sizeof(crop)))
1715                 return -EFAULT;
1716
1717         return 0;
1718 }
1719
1720
1721 static int
1722 et61x251_vidioc_s_crop(struct et61x251_device* cam, void __user * arg)
1723 {
1724         struct et61x251_sensor* s = &cam->sensor;
1725         struct v4l2_crop crop;
1726         struct v4l2_rect* rect;
1727         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1728         struct v4l2_pix_format* pix_format = &(s->pix_format);
1729         u8 scale;
1730         const enum et61x251_stream_state stream = cam->stream;
1731         const u32 nbuffers = cam->nbuffers;
1732         u32 i;
1733         int err = 0;
1734
1735         if (copy_from_user(&crop, arg, sizeof(crop)))
1736                 return -EFAULT;
1737
1738         rect = &(crop.c);
1739
1740         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1741                 return -EINVAL;
1742
1743         if (cam->module_param.force_munmap)
1744                 for (i = 0; i < cam->nbuffers; i++)
1745                         if (cam->frame[i].vma_use_count) {
1746                                 DBG(3, "VIDIOC_S_CROP failed. "
1747                                        "Unmap the buffers first.");
1748                                 return -EINVAL;
1749                         }
1750
1751         /* Preserve R,G or B origin */
1752         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
1753         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
1754
1755         if (rect->width < 4)
1756                 rect->width = 4;
1757         if (rect->height < 4)
1758                 rect->height = 4;
1759         if (rect->width > bounds->width)
1760                 rect->width = bounds->width;
1761         if (rect->height > bounds->height)
1762                 rect->height = bounds->height;
1763         if (rect->left < bounds->left)
1764                 rect->left = bounds->left;
1765         if (rect->top < bounds->top)
1766                 rect->top = bounds->top;
1767         if (rect->left + rect->width > bounds->left + bounds->width)
1768                 rect->left = bounds->left+bounds->width - rect->width;
1769         if (rect->top + rect->height > bounds->top + bounds->height)
1770                 rect->top = bounds->top+bounds->height - rect->height;
1771
1772         rect->width &= ~3L;
1773         rect->height &= ~3L;
1774
1775         if (ET61X251_PRESERVE_IMGSCALE) {
1776                 /* Calculate the actual scaling factor */
1777                 u32 a, b;
1778                 a = rect->width * rect->height;
1779                 b = pix_format->width * pix_format->height;
1780                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1781         } else
1782                 scale = 1;
1783
1784         if (cam->stream == STREAM_ON)
1785                 if ((err = et61x251_stream_interrupt(cam)))
1786                         return err;
1787
1788         if (copy_to_user(arg, &crop, sizeof(crop))) {
1789                 cam->stream = stream;
1790                 return -EFAULT;
1791         }
1792
1793         if (cam->module_param.force_munmap || cam->io == IO_READ)
1794                 et61x251_release_buffers(cam);
1795
1796         err = et61x251_set_crop(cam, rect);
1797         if (s->set_crop)
1798                 err += s->set_crop(cam, rect);
1799         err += et61x251_set_scale(cam, scale);
1800
1801         if (err) { /* atomic, no rollback in ioctl() */
1802                 cam->state |= DEV_MISCONFIGURED;
1803                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1804                        "use the camera, close and open /dev/video%d again.",
1805                     cam->v4ldev->minor);
1806                 return -EIO;
1807         }
1808
1809         s->pix_format.width = rect->width/scale;
1810         s->pix_format.height = rect->height/scale;
1811         memcpy(&(s->_rect), rect, sizeof(*rect));
1812
1813         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1814             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
1815                 cam->state |= DEV_MISCONFIGURED;
1816                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1817                        "use the camera, close and open /dev/video%d again.",
1818                     cam->v4ldev->minor);
1819                 return -ENOMEM;
1820         }
1821
1822         if (cam->io == IO_READ)
1823                 et61x251_empty_framequeues(cam);
1824         else if (cam->module_param.force_munmap)
1825                 et61x251_requeue_outqueue(cam);
1826
1827         cam->stream = stream;
1828
1829         return 0;
1830 }
1831
1832
1833 static int
1834 et61x251_vidioc_enum_fmt(struct et61x251_device* cam, void __user * arg)
1835 {
1836         struct v4l2_fmtdesc fmtd;
1837
1838         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1839                 return -EFAULT;
1840
1841         if (fmtd.index == 0) {
1842                 strcpy(fmtd.description, "bayer rgb");
1843                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
1844         } else if (fmtd.index == 1) {
1845                 strcpy(fmtd.description, "compressed");
1846                 fmtd.pixelformat = V4L2_PIX_FMT_ET61X251;
1847                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1848         } else
1849                 return -EINVAL;
1850
1851         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1852         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1853
1854         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1855                 return -EFAULT;
1856
1857         return 0;
1858 }
1859
1860
1861 static int
1862 et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
1863 {
1864         struct v4l2_format format;
1865         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1866
1867         if (copy_from_user(&format, arg, sizeof(format)))
1868                 return -EFAULT;
1869
1870         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1871                 return -EINVAL;
1872
1873         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
1874                              ? 0 : (pfmt->width * pfmt->priv) / 8;
1875         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1876         pfmt->field = V4L2_FIELD_NONE;
1877         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1878
1879         if (copy_to_user(arg, &format, sizeof(format)))
1880                 return -EFAULT;
1881
1882         return 0;
1883 }
1884
1885
1886 static int
1887 et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
1888                           void __user * arg)
1889 {
1890         struct et61x251_sensor* s = &cam->sensor;
1891         struct v4l2_format format;
1892         struct v4l2_pix_format* pix;
1893         struct v4l2_pix_format* pfmt = &(s->pix_format);
1894         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1895         struct v4l2_rect rect;
1896         u8 scale;
1897         const enum et61x251_stream_state stream = cam->stream;
1898         const u32 nbuffers = cam->nbuffers;
1899         u32 i;
1900         int err = 0;
1901
1902         if (copy_from_user(&format, arg, sizeof(format)))
1903                 return -EFAULT;
1904
1905         pix = &(format.fmt.pix);
1906
1907         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1908                 return -EINVAL;
1909
1910         memcpy(&rect, &(s->_rect), sizeof(rect));
1911
1912         { /* calculate the actual scaling factor */
1913                 u32 a, b;
1914                 a = rect.width * rect.height;
1915                 b = pix->width * pix->height;
1916                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1917         }
1918
1919         rect.width = scale * pix->width;
1920         rect.height = scale * pix->height;
1921
1922         if (rect.width < 4)
1923                 rect.width = 4;
1924         if (rect.height < 4)
1925                 rect.height = 4;
1926         if (rect.width > bounds->left + bounds->width - rect.left)
1927                 rect.width = bounds->left + bounds->width - rect.left;
1928         if (rect.height > bounds->top + bounds->height - rect.top)
1929                 rect.height = bounds->top + bounds->height - rect.top;
1930
1931         rect.width &= ~3L;
1932         rect.height &= ~3L;
1933
1934         { /* adjust the scaling factor */
1935                 u32 a, b;
1936                 a = rect.width * rect.height;
1937                 b = pix->width * pix->height;
1938                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1939         }
1940
1941         pix->width = rect.width / scale;
1942         pix->height = rect.height / scale;
1943
1944         if (pix->pixelformat != V4L2_PIX_FMT_ET61X251 &&
1945             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
1946                 pix->pixelformat = pfmt->pixelformat;
1947         pix->priv = pfmt->priv; /* bpp */
1948         pix->colorspace = pfmt->colorspace;
1949         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1950                             ? 0 : (pix->width * pix->priv) / 8;
1951         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1952         pix->field = V4L2_FIELD_NONE;
1953
1954         if (cmd == VIDIOC_TRY_FMT) {
1955                 if (copy_to_user(arg, &format, sizeof(format)))
1956                         return -EFAULT;
1957                 return 0;
1958         }
1959
1960         if (cam->module_param.force_munmap)
1961                 for (i = 0; i < cam->nbuffers; i++)
1962                         if (cam->frame[i].vma_use_count) {
1963                                 DBG(3, "VIDIOC_S_FMT failed. "
1964                                        "Unmap the buffers first.");
1965                                 return -EINVAL;
1966                         }
1967
1968         if (cam->stream == STREAM_ON)
1969                 if ((err = et61x251_stream_interrupt(cam)))
1970                         return err;
1971
1972         if (copy_to_user(arg, &format, sizeof(format))) {
1973                 cam->stream = stream;
1974                 return -EFAULT;
1975         }
1976
1977         if (cam->module_param.force_munmap || cam->io == IO_READ)
1978                 et61x251_release_buffers(cam);
1979
1980         err += et61x251_set_pix_format(cam, pix);
1981         err += et61x251_set_crop(cam, &rect);
1982         if (s->set_pix_format)
1983                 err += s->set_pix_format(cam, pix);
1984         if (s->set_crop)
1985                 err += s->set_crop(cam, &rect);
1986         err += et61x251_set_scale(cam, scale);
1987
1988         if (err) { /* atomic, no rollback in ioctl() */
1989                 cam->state |= DEV_MISCONFIGURED;
1990                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1991                        "use the camera, close and open /dev/video%d again.",
1992                     cam->v4ldev->minor);
1993                 return -EIO;
1994         }
1995
1996         memcpy(pfmt, pix, sizeof(*pix));
1997         memcpy(&(s->_rect), &rect, sizeof(rect));
1998
1999         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2000             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
2001                 cam->state |= DEV_MISCONFIGURED;
2002                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2003                        "use the camera, close and open /dev/video%d again.",
2004                     cam->v4ldev->minor);
2005                 return -ENOMEM;
2006         }
2007
2008         if (cam->io == IO_READ)
2009                 et61x251_empty_framequeues(cam);
2010         else if (cam->module_param.force_munmap)
2011                 et61x251_requeue_outqueue(cam);
2012
2013         cam->stream = stream;
2014
2015         return 0;
2016 }
2017
2018
2019 static int
2020 et61x251_vidioc_g_jpegcomp(struct et61x251_device* cam, void __user * arg)
2021 {
2022         if (copy_to_user(arg, &cam->compression,
2023                          sizeof(cam->compression)))
2024                 return -EFAULT;
2025
2026         return 0;
2027 }
2028
2029
2030 static int
2031 et61x251_vidioc_s_jpegcomp(struct et61x251_device* cam, void __user * arg)
2032 {
2033         struct v4l2_jpegcompression jc;
2034         const enum et61x251_stream_state stream = cam->stream;
2035         int err = 0;
2036
2037         if (copy_from_user(&jc, arg, sizeof(jc)))
2038                 return -EFAULT;
2039
2040         if (jc.quality != 0 && jc.quality != 1)
2041                 return -EINVAL;
2042
2043         if (cam->stream == STREAM_ON)
2044                 if ((err = et61x251_stream_interrupt(cam)))
2045                         return err;
2046
2047         err += et61x251_set_compression(cam, &jc);
2048         if (err) { /* atomic, no rollback in ioctl() */
2049                 cam->state |= DEV_MISCONFIGURED;
2050                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2051                        "problems. To use the camera, close and open "
2052                        "/dev/video%d again.", cam->v4ldev->minor);
2053                 return -EIO;
2054         }
2055
2056         cam->compression.quality = jc.quality;
2057
2058         cam->stream = stream;
2059
2060         return 0;
2061 }
2062
2063
2064 static int
2065 et61x251_vidioc_reqbufs(struct et61x251_device* cam, void __user * arg)
2066 {
2067         struct v4l2_requestbuffers rb;
2068         u32 i;
2069         int err;
2070
2071         if (copy_from_user(&rb, arg, sizeof(rb)))
2072                 return -EFAULT;
2073
2074         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2075             rb.memory != V4L2_MEMORY_MMAP)
2076                 return -EINVAL;
2077
2078         if (cam->io == IO_READ) {
2079                 DBG(3, "Close and open the device again to choose the mmap "
2080                        "I/O method");
2081                 return -EINVAL;
2082         }
2083
2084         for (i = 0; i < cam->nbuffers; i++)
2085                 if (cam->frame[i].vma_use_count) {
2086                         DBG(3, "VIDIOC_REQBUFS failed. "
2087                                "Previous buffers are still mapped.");
2088                         return -EINVAL;
2089                 }
2090
2091         if (cam->stream == STREAM_ON)
2092                 if ((err = et61x251_stream_interrupt(cam)))
2093                         return err;
2094
2095         et61x251_empty_framequeues(cam);
2096
2097         et61x251_release_buffers(cam);
2098         if (rb.count)
2099                 rb.count = et61x251_request_buffers(cam, rb.count, IO_MMAP);
2100
2101         if (copy_to_user(arg, &rb, sizeof(rb))) {
2102                 et61x251_release_buffers(cam);
2103                 cam->io = IO_NONE;
2104                 return -EFAULT;
2105         }
2106
2107         cam->io = rb.count ? IO_MMAP : IO_NONE;
2108
2109         return 0;
2110 }
2111
2112
2113 static int
2114 et61x251_vidioc_querybuf(struct et61x251_device* cam, void __user * arg)
2115 {
2116         struct v4l2_buffer b;
2117
2118         if (copy_from_user(&b, arg, sizeof(b)))
2119                 return -EFAULT;
2120
2121         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2122             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2123                 return -EINVAL;
2124
2125         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2126
2127         if (cam->frame[b.index].vma_use_count)
2128                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2129
2130         if (cam->frame[b.index].state == F_DONE)
2131                 b.flags |= V4L2_BUF_FLAG_DONE;
2132         else if (cam->frame[b.index].state != F_UNUSED)
2133                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2134
2135         if (copy_to_user(arg, &b, sizeof(b)))
2136                 return -EFAULT;
2137
2138         return 0;
2139 }
2140
2141
2142 static int
2143 et61x251_vidioc_qbuf(struct et61x251_device* cam, void __user * arg)
2144 {
2145         struct v4l2_buffer b;
2146         unsigned long lock_flags;
2147
2148         if (copy_from_user(&b, arg, sizeof(b)))
2149                 return -EFAULT;
2150
2151         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2152             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2153                 return -EINVAL;
2154
2155         if (cam->frame[b.index].state != F_UNUSED)
2156                 return -EINVAL;
2157
2158         cam->frame[b.index].state = F_QUEUED;
2159
2160         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2161         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2162         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2163
2164         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2165
2166         return 0;
2167 }
2168
2169
2170 static int
2171 et61x251_vidioc_dqbuf(struct et61x251_device* cam, struct file* filp,
2172                       void __user * arg)
2173 {
2174         struct v4l2_buffer b;
2175         struct et61x251_frame_t *f;
2176         unsigned long lock_flags;
2177         long timeout;
2178
2179         if (copy_from_user(&b, arg, sizeof(b)))
2180                 return -EFAULT;
2181
2182         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
2183                 return -EINVAL;
2184
2185         if (list_empty(&cam->outqueue)) {
2186                 if (cam->stream == STREAM_OFF)
2187                         return -EINVAL;
2188                 if (filp->f_flags & O_NONBLOCK)
2189                         return -EAGAIN;
2190                 timeout = wait_event_interruptible_timeout
2191                           ( cam->wait_frame,
2192                             (!list_empty(&cam->outqueue)) ||
2193                             (cam->state & DEV_DISCONNECTED) ||
2194                             (cam->state & DEV_MISCONFIGURED),
2195                             cam->module_param.frame_timeout *
2196                             1000 * msecs_to_jiffies(1) );
2197                 if (timeout < 0)
2198                         return timeout;
2199                 if (cam->state & DEV_DISCONNECTED)
2200                         return -ENODEV;
2201                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
2202                         return -EIO;
2203         }
2204
2205         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2206         f = list_entry(cam->outqueue.next, struct et61x251_frame_t, frame);
2207         list_del(cam->outqueue.next);
2208         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2209
2210         f->state = F_UNUSED;
2211
2212         memcpy(&b, &f->buf, sizeof(b));
2213         if (f->vma_use_count)
2214                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2215
2216         if (copy_to_user(arg, &b, sizeof(b)))
2217                 return -EFAULT;
2218
2219         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2220
2221         return 0;
2222 }
2223
2224
2225 static int
2226 et61x251_vidioc_streamon(struct et61x251_device* cam, void __user * arg)
2227 {
2228         int type;
2229
2230         if (copy_from_user(&type, arg, sizeof(type)))
2231                 return -EFAULT;
2232
2233         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2234                 return -EINVAL;
2235
2236         if (list_empty(&cam->inqueue))
2237                 return -EINVAL;
2238
2239         cam->stream = STREAM_ON;
2240
2241         DBG(3, "Stream on");
2242
2243         return 0;
2244 }
2245
2246
2247 static int
2248 et61x251_vidioc_streamoff(struct et61x251_device* cam, void __user * arg)
2249 {
2250         int type, err;
2251
2252         if (copy_from_user(&type, arg, sizeof(type)))
2253                 return -EFAULT;
2254
2255         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2256                 return -EINVAL;
2257
2258         if (cam->stream == STREAM_ON)
2259                 if ((err = et61x251_stream_interrupt(cam)))
2260                         return err;
2261
2262         et61x251_empty_framequeues(cam);
2263
2264         DBG(3, "Stream off");
2265
2266         return 0;
2267 }
2268
2269
2270 static int
2271 et61x251_vidioc_g_parm(struct et61x251_device* cam, void __user * arg)
2272 {
2273         struct v4l2_streamparm sp;
2274
2275         if (copy_from_user(&sp, arg, sizeof(sp)))
2276                 return -EFAULT;
2277
2278         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2279                 return -EINVAL;
2280
2281         sp.parm.capture.extendedmode = 0;
2282         sp.parm.capture.readbuffers = cam->nreadbuffers;
2283
2284         if (copy_to_user(arg, &sp, sizeof(sp)))
2285                 return -EFAULT;
2286
2287         return 0;
2288 }
2289
2290
2291 static int
2292 et61x251_vidioc_s_parm(struct et61x251_device* cam, void __user * arg)
2293 {
2294         struct v4l2_streamparm sp;
2295
2296         if (copy_from_user(&sp, arg, sizeof(sp)))
2297                 return -EFAULT;
2298
2299         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2300                 return -EINVAL;
2301
2302         sp.parm.capture.extendedmode = 0;
2303
2304         if (sp.parm.capture.readbuffers == 0)
2305                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2306
2307         if (sp.parm.capture.readbuffers > ET61X251_MAX_FRAMES)
2308                 sp.parm.capture.readbuffers = ET61X251_MAX_FRAMES;
2309
2310         if (copy_to_user(arg, &sp, sizeof(sp)))
2311                 return -EFAULT;
2312
2313         cam->nreadbuffers = sp.parm.capture.readbuffers;
2314
2315         return 0;
2316 }
2317
2318
2319 static int et61x251_ioctl_v4l2(struct inode* inode, struct file* filp,
2320                                unsigned int cmd, void __user * arg)
2321 {
2322         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2323
2324         switch (cmd) {
2325
2326         case VIDIOC_QUERYCAP:
2327                 return et61x251_vidioc_querycap(cam, arg);
2328
2329         case VIDIOC_ENUMINPUT:
2330                 return et61x251_vidioc_enuminput(cam, arg);
2331
2332         case VIDIOC_G_INPUT:
2333                 return et61x251_vidioc_g_input(cam, arg);
2334
2335         case VIDIOC_S_INPUT:
2336                 return et61x251_vidioc_s_input(cam, arg);
2337
2338         case VIDIOC_QUERYCTRL:
2339                 return et61x251_vidioc_query_ctrl(cam, arg);
2340
2341         case VIDIOC_G_CTRL:
2342                 return et61x251_vidioc_g_ctrl(cam, arg);
2343
2344         case VIDIOC_S_CTRL_OLD:
2345         case VIDIOC_S_CTRL:
2346                 return et61x251_vidioc_s_ctrl(cam, arg);
2347
2348         case VIDIOC_CROPCAP_OLD:
2349         case VIDIOC_CROPCAP:
2350                 return et61x251_vidioc_cropcap(cam, arg);
2351
2352         case VIDIOC_G_CROP:
2353                 return et61x251_vidioc_g_crop(cam, arg);
2354
2355         case VIDIOC_S_CROP:
2356                 return et61x251_vidioc_s_crop(cam, arg);
2357
2358         case VIDIOC_ENUM_FMT:
2359                 return et61x251_vidioc_enum_fmt(cam, arg);
2360
2361         case VIDIOC_G_FMT:
2362                 return et61x251_vidioc_g_fmt(cam, arg);
2363
2364         case VIDIOC_TRY_FMT:
2365         case VIDIOC_S_FMT:
2366                 return et61x251_vidioc_try_s_fmt(cam, cmd, arg);
2367
2368         case VIDIOC_G_JPEGCOMP:
2369                 return et61x251_vidioc_g_jpegcomp(cam, arg);
2370
2371         case VIDIOC_S_JPEGCOMP:
2372                 return et61x251_vidioc_s_jpegcomp(cam, arg);
2373
2374         case VIDIOC_REQBUFS:
2375                 return et61x251_vidioc_reqbufs(cam, arg);
2376
2377         case VIDIOC_QUERYBUF:
2378                 return et61x251_vidioc_querybuf(cam, arg);
2379
2380         case VIDIOC_QBUF:
2381                 return et61x251_vidioc_qbuf(cam, arg);
2382
2383         case VIDIOC_DQBUF:
2384                 return et61x251_vidioc_dqbuf(cam, filp, arg);
2385
2386         case VIDIOC_STREAMON:
2387                 return et61x251_vidioc_streamon(cam, arg);
2388
2389         case VIDIOC_STREAMOFF:
2390                 return et61x251_vidioc_streamoff(cam, arg);
2391
2392         case VIDIOC_G_PARM:
2393                 return et61x251_vidioc_g_parm(cam, arg);
2394
2395         case VIDIOC_S_PARM_OLD:
2396         case VIDIOC_S_PARM:
2397                 return et61x251_vidioc_s_parm(cam, arg);
2398
2399         case VIDIOC_G_STD:
2400         case VIDIOC_S_STD:
2401         case VIDIOC_QUERYSTD:
2402         case VIDIOC_ENUMSTD:
2403         case VIDIOC_QUERYMENU:
2404                 return -EINVAL;
2405
2406         default:
2407                 return -EINVAL;
2408
2409         }
2410 }
2411
2412
2413 static int et61x251_ioctl(struct inode* inode, struct file* filp,
2414                          unsigned int cmd, unsigned long arg)
2415 {
2416         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2417         int err = 0;
2418
2419         if (mutex_lock_interruptible(&cam->fileop_mutex))
2420                 return -ERESTARTSYS;
2421
2422         if (cam->state & DEV_DISCONNECTED) {
2423                 DBG(1, "Device not present");
2424                 mutex_unlock(&cam->fileop_mutex);
2425                 return -ENODEV;
2426         }
2427
2428         if (cam->state & DEV_MISCONFIGURED) {
2429                 DBG(1, "The camera is misconfigured. Close and open it "
2430                        "again.");
2431                 mutex_unlock(&cam->fileop_mutex);
2432                 return -EIO;
2433         }
2434
2435         V4LDBG(3, "et61x251", cmd);
2436
2437         err = et61x251_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
2438
2439         mutex_unlock(&cam->fileop_mutex);
2440
2441         return err;
2442 }
2443
2444
2445 static struct file_operations et61x251_fops = {
2446         .owner = THIS_MODULE,
2447         .open =    et61x251_open,
2448         .release = et61x251_release,
2449         .ioctl =   et61x251_ioctl,
2450         .read =    et61x251_read,
2451         .poll =    et61x251_poll,
2452         .mmap =    et61x251_mmap,
2453         .llseek =  no_llseek,
2454 };
2455
2456 /*****************************************************************************/
2457
2458 /* It exists a single interface only. We do not need to validate anything. */
2459 static int
2460 et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2461 {
2462         struct usb_device *udev = interface_to_usbdev(intf);
2463         struct et61x251_device* cam;
2464         static unsigned int dev_nr = 0;
2465         unsigned int i;
2466         int err = 0;
2467
2468         if (!(cam = kzalloc(sizeof(struct et61x251_device), GFP_KERNEL)))
2469                 return -ENOMEM;
2470
2471         cam->usbdev = udev;
2472
2473         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2474                 DBG(1, "kmalloc() failed");
2475                 err = -ENOMEM;
2476                 goto fail;
2477         }
2478
2479         if (!(cam->v4ldev = video_device_alloc())) {
2480                 DBG(1, "video_device_alloc() failed");
2481                 err = -ENOMEM;
2482                 goto fail;
2483         }
2484
2485         mutex_init(&cam->dev_mutex);
2486
2487         DBG(2, "ET61X[12]51 PC Camera Controller detected "
2488                "(vid/pid 0x%04X/0x%04X)",id->idVendor, id->idProduct);
2489
2490         for  (i = 0; et61x251_sensor_table[i]; i++) {
2491                 err = et61x251_sensor_table[i](cam);
2492                 if (!err)
2493                         break;
2494         }
2495
2496         if (!err)
2497                 DBG(2, "%s image sensor detected", cam->sensor.name);
2498         else {
2499                 DBG(1, "No supported image sensor detected");
2500                 err = -ENODEV;
2501                 goto fail;
2502         }
2503
2504         if (et61x251_init(cam)) {
2505                 DBG(1, "Initialization failed. I will retry on open().");
2506                 cam->state |= DEV_MISCONFIGURED;
2507         }
2508
2509         strcpy(cam->v4ldev->name, "ET61X[12]51 PC Camera");
2510         cam->v4ldev->owner = THIS_MODULE;
2511         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
2512         cam->v4ldev->hardware = 0;
2513         cam->v4ldev->fops = &et61x251_fops;
2514         cam->v4ldev->minor = video_nr[dev_nr];
2515         cam->v4ldev->release = video_device_release;
2516         video_set_drvdata(cam->v4ldev, cam);
2517
2518         mutex_lock(&cam->dev_mutex);
2519
2520         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2521                                     video_nr[dev_nr]);
2522         if (err) {
2523                 DBG(1, "V4L2 device registration failed");
2524                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2525                         DBG(1, "Free /dev/videoX node not found");
2526                 video_nr[dev_nr] = -1;
2527                 dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2528                 mutex_unlock(&cam->dev_mutex);
2529                 goto fail;
2530         }
2531
2532         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2533
2534         cam->module_param.force_munmap = force_munmap[dev_nr];
2535         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2536
2537         dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2538
2539 #ifdef CONFIG_VIDEO_ADV_DEBUG
2540         et61x251_create_sysfs(cam);
2541         DBG(2, "Optional device control through 'sysfs' interface ready");
2542 #endif
2543
2544         usb_set_intfdata(intf, cam);
2545
2546         mutex_unlock(&cam->dev_mutex);
2547
2548         return 0;
2549
2550 fail:
2551         if (cam) {
2552                 kfree(cam->control_buffer);
2553                 if (cam->v4ldev)
2554                         video_device_release(cam->v4ldev);
2555                 kfree(cam);
2556         }
2557         return err;
2558 }
2559
2560
2561 static void et61x251_usb_disconnect(struct usb_interface* intf)
2562 {
2563         struct et61x251_device* cam = usb_get_intfdata(intf);
2564
2565         if (!cam)
2566                 return;
2567
2568         down_write(&et61x251_disconnect);
2569
2570         mutex_lock(&cam->dev_mutex);
2571
2572         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2573
2574         wake_up_interruptible_all(&cam->open);
2575
2576         if (cam->users) {
2577                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2578                        "memory deallocation are deferred on close.",
2579                     cam->v4ldev->minor);
2580                 cam->state |= DEV_MISCONFIGURED;
2581                 et61x251_stop_transfer(cam);
2582                 cam->state |= DEV_DISCONNECTED;
2583                 wake_up_interruptible(&cam->wait_frame);
2584                 wake_up(&cam->wait_stream);
2585                 usb_get_dev(cam->usbdev);
2586         } else {
2587                 cam->state |= DEV_DISCONNECTED;
2588                 et61x251_release_resources(cam);
2589         }
2590
2591         mutex_unlock(&cam->dev_mutex);
2592
2593         if (!cam->users)
2594                 kfree(cam);
2595
2596         up_write(&et61x251_disconnect);
2597 }
2598
2599
2600 static struct usb_driver et61x251_usb_driver = {
2601         .name =       "et61x251",
2602         .id_table =   et61x251_id_table,
2603         .probe =      et61x251_usb_probe,
2604         .disconnect = et61x251_usb_disconnect,
2605 };
2606
2607 /*****************************************************************************/
2608
2609 static int __init et61x251_module_init(void)
2610 {
2611         int err = 0;
2612
2613         KDBG(2, ET61X251_MODULE_NAME " v" ET61X251_MODULE_VERSION);
2614         KDBG(3, ET61X251_MODULE_AUTHOR);
2615
2616         if ((err = usb_register(&et61x251_usb_driver)))
2617                 KDBG(1, "usb_register() failed");
2618
2619         return err;
2620 }
2621
2622
2623 static void __exit et61x251_module_exit(void)
2624 {
2625         usb_deregister(&et61x251_usb_driver);
2626 }
2627
2628
2629 module_init(et61x251_module_init);
2630 module_exit(et61x251_module_exit);