Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * QuickCam Driver For Video4Linux. | |
3 | * | |
4 | * Video4Linux conversion work by Alan Cox. | |
5 | * Parport compatibility by Phil Blundell. | |
6 | * Busy loop avoidance by Mark Cooke. | |
7 | * | |
8 | * Module parameters: | |
9 | * | |
10 | * maxpoll=<1 - 5000> | |
11 | * | |
12 | * When polling the QuickCam for a response, busy-wait for a | |
13 | * maximum of this many loops. The default of 250 gives little | |
14 | * impact on interactive response. | |
15 | * | |
16 | * NOTE: If this parameter is set too high, the processor | |
17 | * will busy wait until this loop times out, and then | |
18 | * slowly poll for a further 5 seconds before failing | |
19 | * the transaction. You have been warned. | |
20 | * | |
21 | * yieldlines=<1 - 250> | |
22 | * | |
23 | * When acquiring a frame from the camera, the data gathering | |
24 | * loop will yield back to the scheduler after completing | |
25 | * this many lines. The default of 4 provides a trade-off | |
26 | * between increased frame acquisition time and impact on | |
27 | * interactive response. | |
28 | */ | |
29 | ||
30 | /* qcam-lib.c -- Library for programming with the Connectix QuickCam. | |
31 | * See the included documentation for usage instructions and details | |
32 | * of the protocol involved. */ | |
33 | ||
34 | ||
35 | /* Version 0.5, August 4, 1996 */ | |
36 | /* Version 0.7, August 27, 1996 */ | |
37 | /* Version 0.9, November 17, 1996 */ | |
38 | ||
39 | ||
40 | /****************************************************************** | |
41 | ||
42 | Copyright (C) 1996 by Scott Laird | |
43 | ||
44 | Permission is hereby granted, free of charge, to any person obtaining | |
45 | a copy of this software and associated documentation files (the | |
46 | "Software"), to deal in the Software without restriction, including | |
47 | without limitation the rights to use, copy, modify, merge, publish, | |
48 | distribute, sublicense, and/or sell copies of the Software, and to | |
49 | permit persons to whom the Software is furnished to do so, subject to | |
50 | the following conditions: | |
51 | ||
52 | The above copyright notice and this permission notice shall be | |
53 | included in all copies or substantial portions of the Software. | |
54 | ||
55 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
56 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
57 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
58 | IN NO EVENT SHALL SCOTT LAIRD BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
59 | OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
60 | ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
61 | OTHER DEALINGS IN THE SOFTWARE. | |
62 | ||
63 | ******************************************************************/ | |
64 | ||
65 | #include <linux/module.h> | |
66 | #include <linux/delay.h> | |
67 | #include <linux/errno.h> | |
68 | #include <linux/fs.h> | |
69 | #include <linux/init.h> | |
70 | #include <linux/kernel.h> | |
71 | #include <linux/slab.h> | |
72 | #include <linux/mm.h> | |
73 | #include <linux/parport.h> | |
74 | #include <linux/sched.h> | |
75 | #include <linux/videodev.h> | |
3593cab5 | 76 | #include <linux/mutex.h> |
1da177e4 LT |
77 | #include <asm/uaccess.h> |
78 | ||
79 | #include "bw-qcam.h" | |
80 | ||
81 | static unsigned int maxpoll=250; /* Maximum busy-loop count for qcam I/O */ | |
82 | static unsigned int yieldlines=4; /* Yield after this many during capture */ | |
83 | static int video_nr = -1; | |
84 | ||
85 | module_param(maxpoll, int, 0); | |
86 | module_param(yieldlines, int, 0); | |
87 | module_param(video_nr, int, 0); | |
88 | ||
89 | static inline int read_lpstatus(struct qcam_device *q) | |
90 | { | |
91 | return parport_read_status(q->pport); | |
92 | } | |
93 | ||
94 | static inline int read_lpdata(struct qcam_device *q) | |
95 | { | |
96 | return parport_read_data(q->pport); | |
97 | } | |
98 | ||
99 | static inline void write_lpdata(struct qcam_device *q, int d) | |
100 | { | |
101 | parport_write_data(q->pport, d); | |
102 | } | |
103 | ||
104 | static inline void write_lpcontrol(struct qcam_device *q, int d) | |
105 | { | |
106 | parport_write_control(q->pport, d); | |
107 | } | |
108 | ||
109 | static int qc_waithand(struct qcam_device *q, int val); | |
110 | static int qc_command(struct qcam_device *q, int command); | |
111 | static int qc_readparam(struct qcam_device *q); | |
112 | static int qc_setscanmode(struct qcam_device *q); | |
113 | static int qc_readbytes(struct qcam_device *q, char buffer[]); | |
114 | ||
115 | static struct video_device qcam_template; | |
116 | ||
117 | static int qc_calibrate(struct qcam_device *q) | |
118 | { | |
119 | /* | |
120 | * Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96 | |
121 | * The white balance is an individiual value for each | |
122 | * quickcam. | |
123 | */ | |
124 | ||
125 | int value; | |
126 | int count = 0; | |
127 | ||
128 | qc_command(q, 27); /* AutoAdjustOffset */ | |
129 | qc_command(q, 0); /* Dummy Parameter, ignored by the camera */ | |
130 | ||
131 | /* GetOffset (33) will read 255 until autocalibration */ | |
132 | /* is finished. After that, a value of 1-254 will be */ | |
133 | /* returned. */ | |
134 | ||
135 | do { | |
136 | qc_command(q, 33); | |
137 | value = qc_readparam(q); | |
138 | mdelay(1); | |
139 | schedule(); | |
140 | count++; | |
141 | } while (value == 0xff && count<2048); | |
142 | ||
143 | q->whitebal = value; | |
144 | return value; | |
145 | } | |
146 | ||
147 | /* Initialize the QuickCam driver control structure. This is where | |
148 | * defaults are set for people who don't have a config file.*/ | |
149 | ||
150 | static struct qcam_device *qcam_init(struct parport *port) | |
151 | { | |
152 | struct qcam_device *q; | |
d56410e0 | 153 | |
1da177e4 LT |
154 | q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL); |
155 | if(q==NULL) | |
156 | return NULL; | |
157 | ||
158 | q->pport = port; | |
159 | q->pdev = parport_register_device(port, "bw-qcam", NULL, NULL, | |
160 | NULL, 0, NULL); | |
d56410e0 | 161 | if (q->pdev == NULL) |
1da177e4 LT |
162 | { |
163 | printk(KERN_ERR "bw-qcam: couldn't register for %s.\n", | |
164 | port->name); | |
165 | kfree(q); | |
166 | return NULL; | |
167 | } | |
d56410e0 | 168 | |
1da177e4 | 169 | memcpy(&q->vdev, &qcam_template, sizeof(qcam_template)); |
d56410e0 | 170 | |
3593cab5 | 171 | mutex_init(&q->lock); |
1da177e4 LT |
172 | |
173 | q->port_mode = (QC_ANY | QC_NOTSET); | |
174 | q->width = 320; | |
175 | q->height = 240; | |
176 | q->bpp = 4; | |
177 | q->transfer_scale = 2; | |
178 | q->contrast = 192; | |
179 | q->brightness = 180; | |
180 | q->whitebal = 105; | |
181 | q->top = 1; | |
182 | q->left = 14; | |
183 | q->mode = -1; | |
184 | q->status = QC_PARAM_CHANGE; | |
185 | return q; | |
186 | } | |
187 | ||
188 | ||
189 | /* qc_command is probably a bit of a misnomer -- it's used to send | |
190 | * bytes *to* the camera. Generally, these bytes are either commands | |
191 | * or arguments to commands, so the name fits, but it still bugs me a | |
192 | * bit. See the documentation for a list of commands. */ | |
193 | ||
194 | static int qc_command(struct qcam_device *q, int command) | |
195 | { | |
196 | int n1, n2; | |
197 | int cmd; | |
198 | ||
199 | write_lpdata(q, command); | |
200 | write_lpcontrol(q, 6); | |
201 | ||
202 | n1 = qc_waithand(q, 1); | |
203 | ||
204 | write_lpcontrol(q, 0xe); | |
205 | n2 = qc_waithand(q, 0); | |
206 | ||
207 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
208 | return cmd; | |
209 | } | |
210 | ||
211 | static int qc_readparam(struct qcam_device *q) | |
212 | { | |
213 | int n1, n2; | |
214 | int cmd; | |
215 | ||
216 | write_lpcontrol(q, 6); | |
217 | n1 = qc_waithand(q, 1); | |
218 | ||
219 | write_lpcontrol(q, 0xe); | |
220 | n2 = qc_waithand(q, 0); | |
221 | ||
222 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
223 | return cmd; | |
224 | } | |
225 | ||
226 | /* qc_waithand busy-waits for a handshake signal from the QuickCam. | |
227 | * Almost all communication with the camera requires handshaking. */ | |
228 | ||
229 | static int qc_waithand(struct qcam_device *q, int val) | |
230 | { | |
231 | int status; | |
232 | int runs=0; | |
233 | ||
234 | if (val) | |
235 | { | |
236 | while (!((status = read_lpstatus(q)) & 8)) | |
237 | { | |
238 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 239 | cases, at that point we start to poll slowly |
1da177e4 LT |
240 | until the camera wakes up. However, we are |
241 | busy blocked until the camera responds, so | |
242 | setting it lower is much better for interactive | |
243 | response. */ | |
d56410e0 | 244 | |
1da177e4 LT |
245 | if(runs++>maxpoll) |
246 | { | |
247 | msleep_interruptible(5); | |
248 | } | |
249 | if(runs>(maxpoll+1000)) /* 5 seconds */ | |
250 | return -1; | |
251 | } | |
252 | } | |
253 | else | |
254 | { | |
255 | while (((status = read_lpstatus(q)) & 8)) | |
256 | { | |
257 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 258 | cases, at that point we start to poll slowly |
1da177e4 LT |
259 | until the camera wakes up. However, we are |
260 | busy blocked until the camera responds, so | |
261 | setting it lower is much better for interactive | |
262 | response. */ | |
d56410e0 | 263 | |
1da177e4 LT |
264 | if(runs++>maxpoll) |
265 | { | |
266 | msleep_interruptible(5); | |
267 | } | |
268 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
269 | return -1; | |
270 | } | |
271 | } | |
272 | ||
273 | return status; | |
274 | } | |
275 | ||
276 | /* Waithand2 is used when the qcam is in bidirectional mode, and the | |
277 | * handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1 | |
278 | * (bit 3 of status register). It also returns the last value read, | |
279 | * since this data is useful. */ | |
280 | ||
281 | static unsigned int qc_waithand2(struct qcam_device *q, int val) | |
282 | { | |
283 | unsigned int status; | |
284 | int runs=0; | |
d56410e0 MCC |
285 | |
286 | do | |
1da177e4 LT |
287 | { |
288 | status = read_lpdata(q); | |
289 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 290 | cases, at that point we start to poll slowly |
1da177e4 LT |
291 | until the camera wakes up. However, we are |
292 | busy blocked until the camera responds, so | |
293 | setting it lower is much better for interactive | |
294 | response. */ | |
d56410e0 | 295 | |
1da177e4 LT |
296 | if(runs++>maxpoll) |
297 | { | |
298 | msleep_interruptible(5); | |
299 | } | |
300 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
301 | return 0; | |
302 | } | |
303 | while ((status & 1) != val); | |
304 | ||
305 | return status; | |
306 | } | |
307 | ||
308 | ||
309 | /* Try to detect a QuickCam. It appears to flash the upper 4 bits of | |
310 | the status register at 5-10 Hz. This is only used in the autoprobe | |
311 | code. Be aware that this isn't the way Connectix detects the | |
312 | camera (they send a reset and try to handshake), but this should be | |
313 | almost completely safe, while their method screws up my printer if | |
314 | I plug it in before the camera. */ | |
315 | ||
316 | static int qc_detect(struct qcam_device *q) | |
317 | { | |
318 | int reg, lastreg; | |
319 | int count = 0; | |
320 | int i; | |
321 | ||
322 | lastreg = reg = read_lpstatus(q) & 0xf0; | |
323 | ||
d56410e0 | 324 | for (i = 0; i < 500; i++) |
1da177e4 LT |
325 | { |
326 | reg = read_lpstatus(q) & 0xf0; | |
327 | if (reg != lastreg) | |
328 | count++; | |
329 | lastreg = reg; | |
330 | mdelay(2); | |
331 | } | |
332 | ||
333 | ||
334 | #if 0 | |
335 | /* Force camera detection during testing. Sometimes the camera | |
336 | won't be flashing these bits. Possibly unloading the module | |
337 | in the middle of a grab? Or some timeout condition? | |
338 | I've seen this parameter as low as 19 on my 450Mhz box - mpc */ | |
339 | printk("Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count); | |
340 | return 1; | |
341 | #endif | |
342 | ||
343 | /* Be (even more) liberal in what you accept... */ | |
344 | ||
345 | /* if (count > 30 && count < 200) */ | |
346 | if (count > 20 && count < 300) | |
347 | return 1; /* found */ | |
348 | else | |
349 | return 0; /* not found */ | |
350 | } | |
351 | ||
352 | ||
353 | /* Reset the QuickCam. This uses the same sequence the Windows | |
354 | * QuickPic program uses. Someone with a bi-directional port should | |
355 | * check that bi-directional mode is detected right, and then | |
356 | * implement bi-directional mode in qc_readbyte(). */ | |
357 | ||
358 | static void qc_reset(struct qcam_device *q) | |
359 | { | |
d56410e0 | 360 | switch (q->port_mode & QC_FORCE_MASK) |
1da177e4 LT |
361 | { |
362 | case QC_FORCE_UNIDIR: | |
363 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
364 | break; | |
365 | ||
366 | case QC_FORCE_BIDIR: | |
367 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
368 | break; | |
369 | ||
370 | case QC_ANY: | |
371 | write_lpcontrol(q, 0x20); | |
372 | write_lpdata(q, 0x75); | |
d56410e0 | 373 | |
1da177e4 LT |
374 | if (read_lpdata(q) != 0x75) { |
375 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
376 | } else { | |
377 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
378 | } | |
379 | break; | |
380 | } | |
381 | ||
382 | write_lpcontrol(q, 0xb); | |
383 | udelay(250); | |
384 | write_lpcontrol(q, 0xe); | |
385 | qc_setscanmode(q); /* in case port_mode changed */ | |
386 | } | |
387 | ||
388 | ||
389 | /* Decide which scan mode to use. There's no real requirement that | |
390 | * the scanmode match the resolution in q->height and q-> width -- the | |
391 | * camera takes the picture at the resolution specified in the | |
392 | * "scanmode" and then returns the image at the resolution specified | |
393 | * with the resolution commands. If the scan is bigger than the | |
394 | * requested resolution, the upper-left hand corner of the scan is | |
395 | * returned. If the scan is smaller, then the rest of the image | |
396 | * returned contains garbage. */ | |
397 | ||
398 | static int qc_setscanmode(struct qcam_device *q) | |
399 | { | |
400 | int old_mode = q->mode; | |
d56410e0 MCC |
401 | |
402 | switch (q->transfer_scale) | |
1da177e4 LT |
403 | { |
404 | case 1: | |
405 | q->mode = 0; | |
406 | break; | |
407 | case 2: | |
408 | q->mode = 4; | |
409 | break; | |
410 | case 4: | |
411 | q->mode = 8; | |
412 | break; | |
413 | } | |
414 | ||
d56410e0 | 415 | switch (q->bpp) |
1da177e4 LT |
416 | { |
417 | case 4: | |
418 | break; | |
419 | case 6: | |
420 | q->mode += 2; | |
421 | break; | |
422 | } | |
423 | ||
d56410e0 | 424 | switch (q->port_mode & QC_MODE_MASK) |
1da177e4 LT |
425 | { |
426 | case QC_BIDIR: | |
427 | q->mode += 1; | |
428 | break; | |
429 | case QC_NOTSET: | |
430 | case QC_UNIDIR: | |
431 | break; | |
432 | } | |
d56410e0 | 433 | |
1da177e4 LT |
434 | if (q->mode != old_mode) |
435 | q->status |= QC_PARAM_CHANGE; | |
d56410e0 | 436 | |
1da177e4 LT |
437 | return 0; |
438 | } | |
439 | ||
440 | ||
441 | /* Reset the QuickCam and program for brightness, contrast, | |
442 | * white-balance, and resolution. */ | |
443 | ||
444 | static void qc_set(struct qcam_device *q) | |
445 | { | |
446 | int val; | |
447 | int val2; | |
448 | ||
449 | qc_reset(q); | |
450 | ||
451 | /* Set the brightness. Yes, this is repetitive, but it works. | |
452 | * Shorter versions seem to fail subtly. Feel free to try :-). */ | |
453 | /* I think the problem was in qc_command, not here -- bls */ | |
d56410e0 | 454 | |
1da177e4 LT |
455 | qc_command(q, 0xb); |
456 | qc_command(q, q->brightness); | |
457 | ||
458 | val = q->height / q->transfer_scale; | |
459 | qc_command(q, 0x11); | |
460 | qc_command(q, val); | |
461 | if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) { | |
462 | /* The normal "transfers per line" calculation doesn't seem to work | |
463 | as expected here (and yet it works fine in qc_scan). No idea | |
464 | why this case is the odd man out. Fortunately, Laird's original | |
465 | working version gives me a good way to guess at working values. | |
466 | -- bls */ | |
467 | val = q->width; | |
468 | val2 = q->transfer_scale * 4; | |
469 | } else { | |
470 | val = q->width * q->bpp; | |
471 | val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
472 | q->transfer_scale; | |
473 | } | |
474 | val = (val + val2 - 1) / val2; | |
475 | qc_command(q, 0x13); | |
476 | qc_command(q, val); | |
477 | ||
478 | /* Setting top and left -- bls */ | |
479 | qc_command(q, 0xd); | |
480 | qc_command(q, q->top); | |
481 | qc_command(q, 0xf); | |
482 | qc_command(q, q->left / 2); | |
483 | ||
484 | qc_command(q, 0x19); | |
485 | qc_command(q, q->contrast); | |
486 | qc_command(q, 0x1f); | |
487 | qc_command(q, q->whitebal); | |
488 | ||
489 | /* Clear flag that we must update the grabbing parameters on the camera | |
490 | before we grab the next frame */ | |
491 | q->status &= (~QC_PARAM_CHANGE); | |
492 | } | |
493 | ||
494 | /* Qc_readbytes reads some bytes from the QC and puts them in | |
495 | the supplied buffer. It returns the number of bytes read, | |
496 | or -1 on error. */ | |
497 | ||
498 | static inline int qc_readbytes(struct qcam_device *q, char buffer[]) | |
499 | { | |
500 | int ret=1; | |
501 | unsigned int hi, lo; | |
502 | unsigned int hi2, lo2; | |
503 | static int state = 0; | |
504 | ||
d56410e0 | 505 | if (buffer == NULL) |
1da177e4 LT |
506 | { |
507 | state = 0; | |
508 | return 0; | |
509 | } | |
d56410e0 MCC |
510 | |
511 | switch (q->port_mode & QC_MODE_MASK) | |
1da177e4 LT |
512 | { |
513 | case QC_BIDIR: /* Bi-directional Port */ | |
514 | write_lpcontrol(q, 0x26); | |
515 | lo = (qc_waithand2(q, 1) >> 1); | |
516 | hi = (read_lpstatus(q) >> 3) & 0x1f; | |
517 | write_lpcontrol(q, 0x2e); | |
518 | lo2 = (qc_waithand2(q, 0) >> 1); | |
519 | hi2 = (read_lpstatus(q) >> 3) & 0x1f; | |
d56410e0 | 520 | switch (q->bpp) |
1da177e4 LT |
521 | { |
522 | case 4: | |
523 | buffer[0] = lo & 0xf; | |
524 | buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3); | |
525 | buffer[2] = (hi & 0x1e) >> 1; | |
526 | buffer[3] = lo2 & 0xf; | |
527 | buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3); | |
528 | buffer[5] = (hi2 & 0x1e) >> 1; | |
529 | ret = 6; | |
530 | break; | |
531 | case 6: | |
532 | buffer[0] = lo & 0x3f; | |
533 | buffer[1] = ((lo & 0x40) >> 6) | (hi << 1); | |
534 | buffer[2] = lo2 & 0x3f; | |
535 | buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1); | |
536 | ret = 4; | |
537 | break; | |
538 | } | |
539 | break; | |
540 | ||
541 | case QC_UNIDIR: /* Unidirectional Port */ | |
542 | write_lpcontrol(q, 6); | |
543 | lo = (qc_waithand(q, 1) & 0xf0) >> 4; | |
544 | write_lpcontrol(q, 0xe); | |
545 | hi = (qc_waithand(q, 0) & 0xf0) >> 4; | |
546 | ||
d56410e0 | 547 | switch (q->bpp) |
1da177e4 LT |
548 | { |
549 | case 4: | |
550 | buffer[0] = lo; | |
551 | buffer[1] = hi; | |
552 | ret = 2; | |
553 | break; | |
554 | case 6: | |
d56410e0 | 555 | switch (state) |
1da177e4 LT |
556 | { |
557 | case 0: | |
558 | buffer[0] = (lo << 2) | ((hi & 0xc) >> 2); | |
559 | q->saved_bits = (hi & 3) << 4; | |
560 | state = 1; | |
561 | ret = 1; | |
562 | break; | |
563 | case 1: | |
564 | buffer[0] = lo | q->saved_bits; | |
565 | q->saved_bits = hi << 2; | |
566 | state = 2; | |
567 | ret = 1; | |
568 | break; | |
569 | case 2: | |
570 | buffer[0] = ((lo & 0xc) >> 2) | q->saved_bits; | |
571 | buffer[1] = ((lo & 3) << 4) | hi; | |
572 | state = 0; | |
573 | ret = 2; | |
574 | break; | |
575 | } | |
576 | break; | |
577 | } | |
578 | break; | |
579 | } | |
580 | return ret; | |
581 | } | |
582 | ||
583 | /* requests a scan from the camera. It sends the correct instructions | |
584 | * to the camera and then reads back the correct number of bytes. In | |
585 | * previous versions of this routine the return structure contained | |
586 | * the raw output from the camera, and there was a 'qc_convertscan' | |
587 | * function that converted that to a useful format. In version 0.3 I | |
588 | * rolled qc_convertscan into qc_scan and now I only return the | |
589 | * converted scan. The format is just an one-dimensional array of | |
590 | * characters, one for each pixel, with 0=black up to n=white, where | |
591 | * n=2^(bit depth)-1. Ask me for more details if you don't understand | |
592 | * this. */ | |
593 | ||
594 | static long qc_capture(struct qcam_device * q, char __user *buf, unsigned long len) | |
595 | { | |
596 | int i, j, k, yield; | |
597 | int bytes; | |
598 | int linestotrans, transperline; | |
599 | int divisor; | |
600 | int pixels_per_line; | |
601 | int pixels_read = 0; | |
602 | int got=0; | |
603 | char buffer[6]; | |
604 | int shift=8-q->bpp; | |
605 | char invert; | |
606 | ||
d56410e0 | 607 | if (q->mode == -1) |
1da177e4 LT |
608 | return -ENXIO; |
609 | ||
610 | qc_command(q, 0x7); | |
611 | qc_command(q, q->mode); | |
612 | ||
d56410e0 | 613 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
614 | { |
615 | write_lpcontrol(q, 0x2e); /* turn port around */ | |
616 | write_lpcontrol(q, 0x26); | |
617 | (void) qc_waithand(q, 1); | |
618 | write_lpcontrol(q, 0x2e); | |
619 | (void) qc_waithand(q, 0); | |
620 | } | |
d56410e0 | 621 | |
1da177e4 LT |
622 | /* strange -- should be 15:63 below, but 4bpp is odd */ |
623 | invert = (q->bpp == 4) ? 16 : 63; | |
624 | ||
625 | linestotrans = q->height / q->transfer_scale; | |
626 | pixels_per_line = q->width / q->transfer_scale; | |
627 | transperline = q->width * q->bpp; | |
628 | divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
629 | q->transfer_scale; | |
630 | transperline = (transperline + divisor - 1) / divisor; | |
631 | ||
d56410e0 | 632 | for (i = 0, yield = yieldlines; i < linestotrans; i++) |
1da177e4 | 633 | { |
d56410e0 | 634 | for (pixels_read = j = 0; j < transperline; j++) |
1da177e4 LT |
635 | { |
636 | bytes = qc_readbytes(q, buffer); | |
d56410e0 | 637 | for (k = 0; k < bytes && (pixels_read + k) < pixels_per_line; k++) |
1da177e4 LT |
638 | { |
639 | int o; | |
d56410e0 | 640 | if (buffer[k] == 0 && invert == 16) |
1da177e4 LT |
641 | { |
642 | /* 4bpp is odd (again) -- inverter is 16, not 15, but output | |
643 | must be 0-15 -- bls */ | |
644 | buffer[k] = 16; | |
645 | } | |
646 | o=i*pixels_per_line + pixels_read + k; | |
647 | if(o<len) | |
648 | { | |
649 | got++; | |
650 | put_user((invert - buffer[k])<<shift, buf+o); | |
651 | } | |
652 | } | |
653 | pixels_read += bytes; | |
654 | } | |
655 | (void) qc_readbytes(q, NULL); /* reset state machine */ | |
d56410e0 | 656 | |
1da177e4 LT |
657 | /* Grabbing an entire frame from the quickcam is a lengthy |
658 | process. We don't (usually) want to busy-block the | |
659 | processor for the entire frame. yieldlines is a module | |
660 | parameter. If we yield every line, the minimum frame | |
661 | time will be 240 / 200 = 1.2 seconds. The compile-time | |
662 | default is to yield every 4 lines. */ | |
663 | if (i >= yield) { | |
664 | msleep_interruptible(5); | |
665 | yield = i + yieldlines; | |
666 | } | |
667 | } | |
668 | ||
d56410e0 | 669 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
670 | { |
671 | write_lpcontrol(q, 2); | |
672 | write_lpcontrol(q, 6); | |
673 | udelay(3); | |
674 | write_lpcontrol(q, 0xe); | |
675 | } | |
676 | if(got<len) | |
677 | return got; | |
678 | return len; | |
679 | } | |
680 | ||
681 | /* | |
682 | * Video4linux interfacing | |
683 | */ | |
684 | ||
685 | static int qcam_do_ioctl(struct inode *inode, struct file *file, | |
686 | unsigned int cmd, void *arg) | |
687 | { | |
688 | struct video_device *dev = video_devdata(file); | |
689 | struct qcam_device *qcam=(struct qcam_device *)dev; | |
d56410e0 | 690 | |
1da177e4 LT |
691 | switch(cmd) |
692 | { | |
693 | case VIDIOCGCAP: | |
694 | { | |
695 | struct video_capability *b = arg; | |
696 | strcpy(b->name, "Quickcam"); | |
697 | b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES|VID_TYPE_MONOCHROME; | |
698 | b->channels = 1; | |
699 | b->audios = 0; | |
700 | b->maxwidth = 320; | |
701 | b->maxheight = 240; | |
702 | b->minwidth = 80; | |
703 | b->minheight = 60; | |
704 | return 0; | |
705 | } | |
706 | case VIDIOCGCHAN: | |
707 | { | |
708 | struct video_channel *v = arg; | |
709 | if(v->channel!=0) | |
710 | return -EINVAL; | |
711 | v->flags=0; | |
712 | v->tuners=0; | |
713 | /* Good question.. its composite or SVHS so.. */ | |
714 | v->type = VIDEO_TYPE_CAMERA; | |
715 | strcpy(v->name, "Camera"); | |
716 | return 0; | |
717 | } | |
718 | case VIDIOCSCHAN: | |
719 | { | |
720 | struct video_channel *v = arg; | |
721 | if(v->channel!=0) | |
722 | return -EINVAL; | |
723 | return 0; | |
724 | } | |
725 | case VIDIOCGTUNER: | |
726 | { | |
727 | struct video_tuner *v = arg; | |
728 | if(v->tuner) | |
729 | return -EINVAL; | |
730 | strcpy(v->name, "Format"); | |
731 | v->rangelow=0; | |
732 | v->rangehigh=0; | |
733 | v->flags= 0; | |
734 | v->mode = VIDEO_MODE_AUTO; | |
735 | return 0; | |
736 | } | |
737 | case VIDIOCSTUNER: | |
738 | { | |
739 | struct video_tuner *v = arg; | |
740 | if(v->tuner) | |
741 | return -EINVAL; | |
742 | if(v->mode!=VIDEO_MODE_AUTO) | |
743 | return -EINVAL; | |
744 | return 0; | |
745 | } | |
746 | case VIDIOCGPICT: | |
747 | { | |
748 | struct video_picture *p = arg; | |
749 | p->colour=0x8000; | |
750 | p->hue=0x8000; | |
751 | p->brightness=qcam->brightness<<8; | |
752 | p->contrast=qcam->contrast<<8; | |
753 | p->whiteness=qcam->whitebal<<8; | |
754 | p->depth=qcam->bpp; | |
755 | p->palette=VIDEO_PALETTE_GREY; | |
756 | return 0; | |
757 | } | |
758 | case VIDIOCSPICT: | |
759 | { | |
760 | struct video_picture *p = arg; | |
761 | if(p->palette!=VIDEO_PALETTE_GREY) | |
762 | return -EINVAL; | |
763 | if(p->depth!=4 && p->depth!=6) | |
764 | return -EINVAL; | |
d56410e0 | 765 | |
1da177e4 LT |
766 | /* |
767 | * Now load the camera. | |
768 | */ | |
769 | ||
770 | qcam->brightness = p->brightness>>8; | |
771 | qcam->contrast = p->contrast>>8; | |
772 | qcam->whitebal = p->whiteness>>8; | |
773 | qcam->bpp = p->depth; | |
774 | ||
3593cab5 | 775 | mutex_lock(&qcam->lock); |
1da177e4 | 776 | qc_setscanmode(qcam); |
3593cab5 | 777 | mutex_unlock(&qcam->lock); |
1da177e4 LT |
778 | qcam->status |= QC_PARAM_CHANGE; |
779 | ||
780 | return 0; | |
781 | } | |
782 | case VIDIOCSWIN: | |
783 | { | |
784 | struct video_window *vw = arg; | |
785 | if(vw->flags) | |
786 | return -EINVAL; | |
787 | if(vw->clipcount) | |
788 | return -EINVAL; | |
789 | if(vw->height<60||vw->height>240) | |
790 | return -EINVAL; | |
791 | if(vw->width<80||vw->width>320) | |
792 | return -EINVAL; | |
d56410e0 | 793 | |
1da177e4 LT |
794 | qcam->width = 320; |
795 | qcam->height = 240; | |
796 | qcam->transfer_scale = 4; | |
d56410e0 | 797 | |
1da177e4 LT |
798 | if(vw->width>=160 && vw->height>=120) |
799 | { | |
800 | qcam->transfer_scale = 2; | |
801 | } | |
802 | if(vw->width>=320 && vw->height>=240) | |
803 | { | |
804 | qcam->width = 320; | |
805 | qcam->height = 240; | |
806 | qcam->transfer_scale = 1; | |
807 | } | |
3593cab5 | 808 | mutex_lock(&qcam->lock); |
1da177e4 | 809 | qc_setscanmode(qcam); |
3593cab5 | 810 | mutex_unlock(&qcam->lock); |
d56410e0 | 811 | |
1da177e4 LT |
812 | /* We must update the camera before we grab. We could |
813 | just have changed the grab size */ | |
814 | qcam->status |= QC_PARAM_CHANGE; | |
d56410e0 | 815 | |
1da177e4 LT |
816 | /* Ok we figured out what to use from our wide choice */ |
817 | return 0; | |
818 | } | |
819 | case VIDIOCGWIN: | |
820 | { | |
821 | struct video_window *vw = arg; | |
822 | memset(vw, 0, sizeof(*vw)); | |
823 | vw->width=qcam->width/qcam->transfer_scale; | |
824 | vw->height=qcam->height/qcam->transfer_scale; | |
825 | return 0; | |
826 | } | |
827 | case VIDIOCKEY: | |
828 | return 0; | |
829 | case VIDIOCCAPTURE: | |
830 | case VIDIOCGFBUF: | |
831 | case VIDIOCSFBUF: | |
832 | case VIDIOCGFREQ: | |
833 | case VIDIOCSFREQ: | |
834 | case VIDIOCGAUDIO: | |
835 | case VIDIOCSAUDIO: | |
836 | return -EINVAL; | |
837 | default: | |
838 | return -ENOIOCTLCMD; | |
839 | } | |
840 | return 0; | |
841 | } | |
842 | ||
843 | static int qcam_ioctl(struct inode *inode, struct file *file, | |
844 | unsigned int cmd, unsigned long arg) | |
845 | { | |
846 | return video_usercopy(inode, file, cmd, arg, qcam_do_ioctl); | |
847 | } | |
848 | ||
849 | static ssize_t qcam_read(struct file *file, char __user *buf, | |
850 | size_t count, loff_t *ppos) | |
851 | { | |
852 | struct video_device *v = video_devdata(file); | |
853 | struct qcam_device *qcam=(struct qcam_device *)v; | |
854 | int len; | |
855 | parport_claim_or_block(qcam->pdev); | |
d56410e0 | 856 | |
3593cab5 | 857 | mutex_lock(&qcam->lock); |
d56410e0 | 858 | |
1da177e4 LT |
859 | qc_reset(qcam); |
860 | ||
861 | /* Update the camera parameters if we need to */ | |
862 | if (qcam->status & QC_PARAM_CHANGE) | |
863 | qc_set(qcam); | |
864 | ||
865 | len=qc_capture(qcam, buf,count); | |
d56410e0 | 866 | |
3593cab5 | 867 | mutex_unlock(&qcam->lock); |
d56410e0 | 868 | |
1da177e4 LT |
869 | parport_release(qcam->pdev); |
870 | return len; | |
871 | } | |
d56410e0 | 872 | |
1da177e4 LT |
873 | static struct file_operations qcam_fops = { |
874 | .owner = THIS_MODULE, | |
875 | .open = video_exclusive_open, | |
876 | .release = video_exclusive_release, | |
877 | .ioctl = qcam_ioctl, | |
0d0fbf81 | 878 | .compat_ioctl = v4l_compat_ioctl32, |
1da177e4 LT |
879 | .read = qcam_read, |
880 | .llseek = no_llseek, | |
881 | }; | |
882 | static struct video_device qcam_template= | |
883 | { | |
884 | .owner = THIS_MODULE, | |
885 | .name = "Connectix Quickcam", | |
886 | .type = VID_TYPE_CAPTURE, | |
887 | .hardware = VID_HARDWARE_QCAM_BW, | |
888 | .fops = &qcam_fops, | |
889 | }; | |
890 | ||
891 | #define MAX_CAMS 4 | |
892 | static struct qcam_device *qcams[MAX_CAMS]; | |
893 | static unsigned int num_cams = 0; | |
894 | ||
895 | static int init_bwqcam(struct parport *port) | |
896 | { | |
897 | struct qcam_device *qcam; | |
898 | ||
899 | if (num_cams == MAX_CAMS) | |
900 | { | |
901 | printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS); | |
902 | return -ENOSPC; | |
903 | } | |
904 | ||
905 | qcam=qcam_init(port); | |
906 | if(qcam==NULL) | |
907 | return -ENODEV; | |
d56410e0 | 908 | |
1da177e4 LT |
909 | parport_claim_or_block(qcam->pdev); |
910 | ||
911 | qc_reset(qcam); | |
d56410e0 | 912 | |
1da177e4 LT |
913 | if(qc_detect(qcam)==0) |
914 | { | |
915 | parport_release(qcam->pdev); | |
916 | parport_unregister_device(qcam->pdev); | |
917 | kfree(qcam); | |
918 | return -ENODEV; | |
919 | } | |
920 | qc_calibrate(qcam); | |
921 | ||
922 | parport_release(qcam->pdev); | |
d56410e0 | 923 | |
1da177e4 | 924 | printk(KERN_INFO "Connectix Quickcam on %s\n", qcam->pport->name); |
d56410e0 | 925 | |
1da177e4 LT |
926 | if(video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1) |
927 | { | |
928 | parport_unregister_device(qcam->pdev); | |
929 | kfree(qcam); | |
930 | return -ENODEV; | |
931 | } | |
932 | ||
933 | qcams[num_cams++] = qcam; | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
938 | static void close_bwqcam(struct qcam_device *qcam) | |
939 | { | |
940 | video_unregister_device(&qcam->vdev); | |
941 | parport_unregister_device(qcam->pdev); | |
942 | kfree(qcam); | |
943 | } | |
944 | ||
945 | /* The parport parameter controls which parports will be scanned. | |
946 | * Scanning all parports causes some printers to print a garbage page. | |
947 | * -- March 14, 1999 Billy Donahue <billy@escape.com> */ | |
948 | #ifdef MODULE | |
949 | static char *parport[MAX_CAMS] = { NULL, }; | |
950 | module_param_array(parport, charp, NULL, 0); | |
951 | #endif | |
952 | ||
953 | static int accept_bwqcam(struct parport *port) | |
954 | { | |
955 | #ifdef MODULE | |
956 | int n; | |
957 | ||
958 | if (parport[0] && strncmp(parport[0], "auto", 4) != 0) { | |
959 | /* user gave parport parameters */ | |
960 | for(n=0; parport[n] && n<MAX_CAMS; n++){ | |
961 | char *ep; | |
962 | unsigned long r; | |
963 | r = simple_strtoul(parport[n], &ep, 0); | |
964 | if (ep == parport[n]) { | |
965 | printk(KERN_ERR | |
966 | "bw-qcam: bad port specifier \"%s\"\n", | |
967 | parport[n]); | |
968 | continue; | |
969 | } | |
970 | if (r == port->number) | |
971 | return 1; | |
972 | } | |
973 | return 0; | |
974 | } | |
975 | #endif | |
976 | return 1; | |
977 | } | |
978 | ||
979 | static void bwqcam_attach(struct parport *port) | |
980 | { | |
981 | if (accept_bwqcam(port)) | |
982 | init_bwqcam(port); | |
983 | } | |
984 | ||
985 | static void bwqcam_detach(struct parport *port) | |
986 | { | |
987 | int i; | |
988 | for (i = 0; i < num_cams; i++) { | |
989 | struct qcam_device *qcam = qcams[i]; | |
990 | if (qcam && qcam->pdev->port == port) { | |
991 | qcams[i] = NULL; | |
992 | close_bwqcam(qcam); | |
993 | } | |
994 | } | |
995 | } | |
996 | ||
997 | static struct parport_driver bwqcam_driver = { | |
998 | .name = "bw-qcam", | |
999 | .attach = bwqcam_attach, | |
1000 | .detach = bwqcam_detach, | |
1001 | }; | |
1002 | ||
1003 | static void __exit exit_bw_qcams(void) | |
1004 | { | |
1005 | parport_unregister_driver(&bwqcam_driver); | |
1006 | } | |
1007 | ||
1008 | static int __init init_bw_qcams(void) | |
1009 | { | |
1010 | #ifdef MODULE | |
1011 | /* Do some sanity checks on the module parameters. */ | |
1012 | if (maxpoll > 5000) { | |
1013 | printk("Connectix Quickcam max-poll was above 5000. Using 5000.\n"); | |
1014 | maxpoll = 5000; | |
1015 | } | |
d56410e0 | 1016 | |
1da177e4 LT |
1017 | if (yieldlines < 1) { |
1018 | printk("Connectix Quickcam yieldlines was less than 1. Using 1.\n"); | |
1019 | yieldlines = 1; | |
1020 | } | |
1021 | #endif | |
1022 | return parport_register_driver(&bwqcam_driver); | |
1023 | } | |
1024 | ||
1025 | module_init(init_bw_qcams); | |
1026 | module_exit(exit_bw_qcams); | |
1027 | ||
1028 | MODULE_LICENSE("GPL"); |