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> | |
5e87efa3 | 76 | #include <media/v4l2-common.h> |
3593cab5 | 77 | #include <linux/mutex.h> |
1da177e4 LT |
78 | #include <asm/uaccess.h> |
79 | ||
80 | #include "bw-qcam.h" | |
81 | ||
82 | static unsigned int maxpoll=250; /* Maximum busy-loop count for qcam I/O */ | |
83 | static unsigned int yieldlines=4; /* Yield after this many during capture */ | |
84 | static int video_nr = -1; | |
85 | ||
86 | module_param(maxpoll, int, 0); | |
87 | module_param(yieldlines, int, 0); | |
88 | module_param(video_nr, int, 0); | |
89 | ||
90 | static inline int read_lpstatus(struct qcam_device *q) | |
91 | { | |
92 | return parport_read_status(q->pport); | |
93 | } | |
94 | ||
95 | static inline int read_lpdata(struct qcam_device *q) | |
96 | { | |
97 | return parport_read_data(q->pport); | |
98 | } | |
99 | ||
100 | static inline void write_lpdata(struct qcam_device *q, int d) | |
101 | { | |
102 | parport_write_data(q->pport, d); | |
103 | } | |
104 | ||
105 | static inline void write_lpcontrol(struct qcam_device *q, int d) | |
106 | { | |
107 | parport_write_control(q->pport, d); | |
108 | } | |
109 | ||
110 | static int qc_waithand(struct qcam_device *q, int val); | |
111 | static int qc_command(struct qcam_device *q, int command); | |
112 | static int qc_readparam(struct qcam_device *q); | |
113 | static int qc_setscanmode(struct qcam_device *q); | |
114 | static int qc_readbytes(struct qcam_device *q, char buffer[]); | |
115 | ||
116 | static struct video_device qcam_template; | |
117 | ||
118 | static int qc_calibrate(struct qcam_device *q) | |
119 | { | |
120 | /* | |
121 | * Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96 | |
122 | * The white balance is an individiual value for each | |
123 | * quickcam. | |
124 | */ | |
125 | ||
126 | int value; | |
127 | int count = 0; | |
128 | ||
129 | qc_command(q, 27); /* AutoAdjustOffset */ | |
130 | qc_command(q, 0); /* Dummy Parameter, ignored by the camera */ | |
131 | ||
132 | /* GetOffset (33) will read 255 until autocalibration */ | |
133 | /* is finished. After that, a value of 1-254 will be */ | |
134 | /* returned. */ | |
135 | ||
136 | do { | |
137 | qc_command(q, 33); | |
138 | value = qc_readparam(q); | |
139 | mdelay(1); | |
140 | schedule(); | |
141 | count++; | |
142 | } while (value == 0xff && count<2048); | |
143 | ||
144 | q->whitebal = value; | |
145 | return value; | |
146 | } | |
147 | ||
148 | /* Initialize the QuickCam driver control structure. This is where | |
149 | * defaults are set for people who don't have a config file.*/ | |
150 | ||
151 | static struct qcam_device *qcam_init(struct parport *port) | |
152 | { | |
153 | struct qcam_device *q; | |
d56410e0 | 154 | |
1da177e4 LT |
155 | q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL); |
156 | if(q==NULL) | |
157 | return NULL; | |
158 | ||
159 | q->pport = port; | |
160 | q->pdev = parport_register_device(port, "bw-qcam", NULL, NULL, | |
161 | NULL, 0, NULL); | |
d56410e0 | 162 | if (q->pdev == NULL) |
1da177e4 LT |
163 | { |
164 | printk(KERN_ERR "bw-qcam: couldn't register for %s.\n", | |
165 | port->name); | |
166 | kfree(q); | |
167 | return NULL; | |
168 | } | |
d56410e0 | 169 | |
1da177e4 | 170 | memcpy(&q->vdev, &qcam_template, sizeof(qcam_template)); |
d56410e0 | 171 | |
3593cab5 | 172 | mutex_init(&q->lock); |
1da177e4 LT |
173 | |
174 | q->port_mode = (QC_ANY | QC_NOTSET); | |
175 | q->width = 320; | |
176 | q->height = 240; | |
177 | q->bpp = 4; | |
178 | q->transfer_scale = 2; | |
179 | q->contrast = 192; | |
180 | q->brightness = 180; | |
181 | q->whitebal = 105; | |
182 | q->top = 1; | |
183 | q->left = 14; | |
184 | q->mode = -1; | |
185 | q->status = QC_PARAM_CHANGE; | |
186 | return q; | |
187 | } | |
188 | ||
189 | ||
190 | /* qc_command is probably a bit of a misnomer -- it's used to send | |
191 | * bytes *to* the camera. Generally, these bytes are either commands | |
192 | * or arguments to commands, so the name fits, but it still bugs me a | |
193 | * bit. See the documentation for a list of commands. */ | |
194 | ||
195 | static int qc_command(struct qcam_device *q, int command) | |
196 | { | |
197 | int n1, n2; | |
198 | int cmd; | |
199 | ||
200 | write_lpdata(q, command); | |
201 | write_lpcontrol(q, 6); | |
202 | ||
203 | n1 = qc_waithand(q, 1); | |
204 | ||
205 | write_lpcontrol(q, 0xe); | |
206 | n2 = qc_waithand(q, 0); | |
207 | ||
208 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
209 | return cmd; | |
210 | } | |
211 | ||
212 | static int qc_readparam(struct qcam_device *q) | |
213 | { | |
214 | int n1, n2; | |
215 | int cmd; | |
216 | ||
217 | write_lpcontrol(q, 6); | |
218 | n1 = qc_waithand(q, 1); | |
219 | ||
220 | write_lpcontrol(q, 0xe); | |
221 | n2 = qc_waithand(q, 0); | |
222 | ||
223 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
224 | return cmd; | |
225 | } | |
226 | ||
227 | /* qc_waithand busy-waits for a handshake signal from the QuickCam. | |
228 | * Almost all communication with the camera requires handshaking. */ | |
229 | ||
230 | static int qc_waithand(struct qcam_device *q, int val) | |
231 | { | |
232 | int status; | |
233 | int runs=0; | |
234 | ||
235 | if (val) | |
236 | { | |
237 | while (!((status = read_lpstatus(q)) & 8)) | |
238 | { | |
239 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 240 | cases, at that point we start to poll slowly |
1da177e4 LT |
241 | until the camera wakes up. However, we are |
242 | busy blocked until the camera responds, so | |
243 | setting it lower is much better for interactive | |
244 | response. */ | |
d56410e0 | 245 | |
1da177e4 LT |
246 | if(runs++>maxpoll) |
247 | { | |
248 | msleep_interruptible(5); | |
249 | } | |
250 | if(runs>(maxpoll+1000)) /* 5 seconds */ | |
251 | return -1; | |
252 | } | |
253 | } | |
254 | else | |
255 | { | |
256 | while (((status = read_lpstatus(q)) & 8)) | |
257 | { | |
258 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 259 | cases, at that point we start to poll slowly |
1da177e4 LT |
260 | until the camera wakes up. However, we are |
261 | busy blocked until the camera responds, so | |
262 | setting it lower is much better for interactive | |
263 | response. */ | |
d56410e0 | 264 | |
1da177e4 LT |
265 | if(runs++>maxpoll) |
266 | { | |
267 | msleep_interruptible(5); | |
268 | } | |
269 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
270 | return -1; | |
271 | } | |
272 | } | |
273 | ||
274 | return status; | |
275 | } | |
276 | ||
277 | /* Waithand2 is used when the qcam is in bidirectional mode, and the | |
278 | * handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1 | |
279 | * (bit 3 of status register). It also returns the last value read, | |
280 | * since this data is useful. */ | |
281 | ||
282 | static unsigned int qc_waithand2(struct qcam_device *q, int val) | |
283 | { | |
284 | unsigned int status; | |
285 | int runs=0; | |
d56410e0 MCC |
286 | |
287 | do | |
1da177e4 LT |
288 | { |
289 | status = read_lpdata(q); | |
290 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 291 | cases, at that point we start to poll slowly |
1da177e4 LT |
292 | until the camera wakes up. However, we are |
293 | busy blocked until the camera responds, so | |
294 | setting it lower is much better for interactive | |
295 | response. */ | |
d56410e0 | 296 | |
1da177e4 LT |
297 | if(runs++>maxpoll) |
298 | { | |
299 | msleep_interruptible(5); | |
300 | } | |
301 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
302 | return 0; | |
303 | } | |
304 | while ((status & 1) != val); | |
305 | ||
306 | return status; | |
307 | } | |
308 | ||
309 | ||
310 | /* Try to detect a QuickCam. It appears to flash the upper 4 bits of | |
311 | the status register at 5-10 Hz. This is only used in the autoprobe | |
312 | code. Be aware that this isn't the way Connectix detects the | |
313 | camera (they send a reset and try to handshake), but this should be | |
314 | almost completely safe, while their method screws up my printer if | |
315 | I plug it in before the camera. */ | |
316 | ||
317 | static int qc_detect(struct qcam_device *q) | |
318 | { | |
319 | int reg, lastreg; | |
320 | int count = 0; | |
321 | int i; | |
322 | ||
323 | lastreg = reg = read_lpstatus(q) & 0xf0; | |
324 | ||
d56410e0 | 325 | for (i = 0; i < 500; i++) |
1da177e4 LT |
326 | { |
327 | reg = read_lpstatus(q) & 0xf0; | |
328 | if (reg != lastreg) | |
329 | count++; | |
330 | lastreg = reg; | |
331 | mdelay(2); | |
332 | } | |
333 | ||
334 | ||
335 | #if 0 | |
336 | /* Force camera detection during testing. Sometimes the camera | |
337 | won't be flashing these bits. Possibly unloading the module | |
338 | in the middle of a grab? Or some timeout condition? | |
339 | I've seen this parameter as low as 19 on my 450Mhz box - mpc */ | |
340 | printk("Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count); | |
341 | return 1; | |
342 | #endif | |
343 | ||
344 | /* Be (even more) liberal in what you accept... */ | |
345 | ||
346 | /* if (count > 30 && count < 200) */ | |
347 | if (count > 20 && count < 300) | |
348 | return 1; /* found */ | |
349 | else | |
350 | return 0; /* not found */ | |
351 | } | |
352 | ||
353 | ||
354 | /* Reset the QuickCam. This uses the same sequence the Windows | |
355 | * QuickPic program uses. Someone with a bi-directional port should | |
356 | * check that bi-directional mode is detected right, and then | |
357 | * implement bi-directional mode in qc_readbyte(). */ | |
358 | ||
359 | static void qc_reset(struct qcam_device *q) | |
360 | { | |
d56410e0 | 361 | switch (q->port_mode & QC_FORCE_MASK) |
1da177e4 LT |
362 | { |
363 | case QC_FORCE_UNIDIR: | |
364 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
365 | break; | |
366 | ||
367 | case QC_FORCE_BIDIR: | |
368 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
369 | break; | |
370 | ||
371 | case QC_ANY: | |
372 | write_lpcontrol(q, 0x20); | |
373 | write_lpdata(q, 0x75); | |
d56410e0 | 374 | |
1da177e4 LT |
375 | if (read_lpdata(q) != 0x75) { |
376 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
377 | } else { | |
378 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
379 | } | |
380 | break; | |
381 | } | |
382 | ||
383 | write_lpcontrol(q, 0xb); | |
384 | udelay(250); | |
385 | write_lpcontrol(q, 0xe); | |
386 | qc_setscanmode(q); /* in case port_mode changed */ | |
387 | } | |
388 | ||
389 | ||
390 | /* Decide which scan mode to use. There's no real requirement that | |
391 | * the scanmode match the resolution in q->height and q-> width -- the | |
392 | * camera takes the picture at the resolution specified in the | |
393 | * "scanmode" and then returns the image at the resolution specified | |
394 | * with the resolution commands. If the scan is bigger than the | |
395 | * requested resolution, the upper-left hand corner of the scan is | |
396 | * returned. If the scan is smaller, then the rest of the image | |
397 | * returned contains garbage. */ | |
398 | ||
399 | static int qc_setscanmode(struct qcam_device *q) | |
400 | { | |
401 | int old_mode = q->mode; | |
d56410e0 MCC |
402 | |
403 | switch (q->transfer_scale) | |
1da177e4 LT |
404 | { |
405 | case 1: | |
406 | q->mode = 0; | |
407 | break; | |
408 | case 2: | |
409 | q->mode = 4; | |
410 | break; | |
411 | case 4: | |
412 | q->mode = 8; | |
413 | break; | |
414 | } | |
415 | ||
d56410e0 | 416 | switch (q->bpp) |
1da177e4 LT |
417 | { |
418 | case 4: | |
419 | break; | |
420 | case 6: | |
421 | q->mode += 2; | |
422 | break; | |
423 | } | |
424 | ||
d56410e0 | 425 | switch (q->port_mode & QC_MODE_MASK) |
1da177e4 LT |
426 | { |
427 | case QC_BIDIR: | |
428 | q->mode += 1; | |
429 | break; | |
430 | case QC_NOTSET: | |
431 | case QC_UNIDIR: | |
432 | break; | |
433 | } | |
d56410e0 | 434 | |
1da177e4 LT |
435 | if (q->mode != old_mode) |
436 | q->status |= QC_PARAM_CHANGE; | |
d56410e0 | 437 | |
1da177e4 LT |
438 | return 0; |
439 | } | |
440 | ||
441 | ||
442 | /* Reset the QuickCam and program for brightness, contrast, | |
443 | * white-balance, and resolution. */ | |
444 | ||
445 | static void qc_set(struct qcam_device *q) | |
446 | { | |
447 | int val; | |
448 | int val2; | |
449 | ||
450 | qc_reset(q); | |
451 | ||
452 | /* Set the brightness. Yes, this is repetitive, but it works. | |
453 | * Shorter versions seem to fail subtly. Feel free to try :-). */ | |
454 | /* I think the problem was in qc_command, not here -- bls */ | |
d56410e0 | 455 | |
1da177e4 LT |
456 | qc_command(q, 0xb); |
457 | qc_command(q, q->brightness); | |
458 | ||
459 | val = q->height / q->transfer_scale; | |
460 | qc_command(q, 0x11); | |
461 | qc_command(q, val); | |
462 | if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) { | |
463 | /* The normal "transfers per line" calculation doesn't seem to work | |
464 | as expected here (and yet it works fine in qc_scan). No idea | |
465 | why this case is the odd man out. Fortunately, Laird's original | |
466 | working version gives me a good way to guess at working values. | |
467 | -- bls */ | |
468 | val = q->width; | |
469 | val2 = q->transfer_scale * 4; | |
470 | } else { | |
471 | val = q->width * q->bpp; | |
472 | val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
473 | q->transfer_scale; | |
474 | } | |
475 | val = (val + val2 - 1) / val2; | |
476 | qc_command(q, 0x13); | |
477 | qc_command(q, val); | |
478 | ||
479 | /* Setting top and left -- bls */ | |
480 | qc_command(q, 0xd); | |
481 | qc_command(q, q->top); | |
482 | qc_command(q, 0xf); | |
483 | qc_command(q, q->left / 2); | |
484 | ||
485 | qc_command(q, 0x19); | |
486 | qc_command(q, q->contrast); | |
487 | qc_command(q, 0x1f); | |
488 | qc_command(q, q->whitebal); | |
489 | ||
490 | /* Clear flag that we must update the grabbing parameters on the camera | |
491 | before we grab the next frame */ | |
492 | q->status &= (~QC_PARAM_CHANGE); | |
493 | } | |
494 | ||
495 | /* Qc_readbytes reads some bytes from the QC and puts them in | |
496 | the supplied buffer. It returns the number of bytes read, | |
497 | or -1 on error. */ | |
498 | ||
499 | static inline int qc_readbytes(struct qcam_device *q, char buffer[]) | |
500 | { | |
501 | int ret=1; | |
502 | unsigned int hi, lo; | |
503 | unsigned int hi2, lo2; | |
504 | static int state = 0; | |
505 | ||
d56410e0 | 506 | if (buffer == NULL) |
1da177e4 LT |
507 | { |
508 | state = 0; | |
509 | return 0; | |
510 | } | |
d56410e0 MCC |
511 | |
512 | switch (q->port_mode & QC_MODE_MASK) | |
1da177e4 LT |
513 | { |
514 | case QC_BIDIR: /* Bi-directional Port */ | |
515 | write_lpcontrol(q, 0x26); | |
516 | lo = (qc_waithand2(q, 1) >> 1); | |
517 | hi = (read_lpstatus(q) >> 3) & 0x1f; | |
518 | write_lpcontrol(q, 0x2e); | |
519 | lo2 = (qc_waithand2(q, 0) >> 1); | |
520 | hi2 = (read_lpstatus(q) >> 3) & 0x1f; | |
d56410e0 | 521 | switch (q->bpp) |
1da177e4 LT |
522 | { |
523 | case 4: | |
524 | buffer[0] = lo & 0xf; | |
525 | buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3); | |
526 | buffer[2] = (hi & 0x1e) >> 1; | |
527 | buffer[3] = lo2 & 0xf; | |
528 | buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3); | |
529 | buffer[5] = (hi2 & 0x1e) >> 1; | |
530 | ret = 6; | |
531 | break; | |
532 | case 6: | |
533 | buffer[0] = lo & 0x3f; | |
534 | buffer[1] = ((lo & 0x40) >> 6) | (hi << 1); | |
535 | buffer[2] = lo2 & 0x3f; | |
536 | buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1); | |
537 | ret = 4; | |
538 | break; | |
539 | } | |
540 | break; | |
541 | ||
542 | case QC_UNIDIR: /* Unidirectional Port */ | |
543 | write_lpcontrol(q, 6); | |
544 | lo = (qc_waithand(q, 1) & 0xf0) >> 4; | |
545 | write_lpcontrol(q, 0xe); | |
546 | hi = (qc_waithand(q, 0) & 0xf0) >> 4; | |
547 | ||
d56410e0 | 548 | switch (q->bpp) |
1da177e4 LT |
549 | { |
550 | case 4: | |
551 | buffer[0] = lo; | |
552 | buffer[1] = hi; | |
553 | ret = 2; | |
554 | break; | |
555 | case 6: | |
d56410e0 | 556 | switch (state) |
1da177e4 LT |
557 | { |
558 | case 0: | |
559 | buffer[0] = (lo << 2) | ((hi & 0xc) >> 2); | |
560 | q->saved_bits = (hi & 3) << 4; | |
561 | state = 1; | |
562 | ret = 1; | |
563 | break; | |
564 | case 1: | |
565 | buffer[0] = lo | q->saved_bits; | |
566 | q->saved_bits = hi << 2; | |
567 | state = 2; | |
568 | ret = 1; | |
569 | break; | |
570 | case 2: | |
571 | buffer[0] = ((lo & 0xc) >> 2) | q->saved_bits; | |
572 | buffer[1] = ((lo & 3) << 4) | hi; | |
573 | state = 0; | |
574 | ret = 2; | |
575 | break; | |
576 | } | |
577 | break; | |
578 | } | |
579 | break; | |
580 | } | |
581 | return ret; | |
582 | } | |
583 | ||
584 | /* requests a scan from the camera. It sends the correct instructions | |
585 | * to the camera and then reads back the correct number of bytes. In | |
586 | * previous versions of this routine the return structure contained | |
587 | * the raw output from the camera, and there was a 'qc_convertscan' | |
588 | * function that converted that to a useful format. In version 0.3 I | |
589 | * rolled qc_convertscan into qc_scan and now I only return the | |
590 | * converted scan. The format is just an one-dimensional array of | |
591 | * characters, one for each pixel, with 0=black up to n=white, where | |
592 | * n=2^(bit depth)-1. Ask me for more details if you don't understand | |
593 | * this. */ | |
594 | ||
595 | static long qc_capture(struct qcam_device * q, char __user *buf, unsigned long len) | |
596 | { | |
597 | int i, j, k, yield; | |
598 | int bytes; | |
599 | int linestotrans, transperline; | |
600 | int divisor; | |
601 | int pixels_per_line; | |
602 | int pixels_read = 0; | |
603 | int got=0; | |
604 | char buffer[6]; | |
605 | int shift=8-q->bpp; | |
606 | char invert; | |
607 | ||
d56410e0 | 608 | if (q->mode == -1) |
1da177e4 LT |
609 | return -ENXIO; |
610 | ||
611 | qc_command(q, 0x7); | |
612 | qc_command(q, q->mode); | |
613 | ||
d56410e0 | 614 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
615 | { |
616 | write_lpcontrol(q, 0x2e); /* turn port around */ | |
617 | write_lpcontrol(q, 0x26); | |
618 | (void) qc_waithand(q, 1); | |
619 | write_lpcontrol(q, 0x2e); | |
620 | (void) qc_waithand(q, 0); | |
621 | } | |
d56410e0 | 622 | |
1da177e4 LT |
623 | /* strange -- should be 15:63 below, but 4bpp is odd */ |
624 | invert = (q->bpp == 4) ? 16 : 63; | |
625 | ||
626 | linestotrans = q->height / q->transfer_scale; | |
627 | pixels_per_line = q->width / q->transfer_scale; | |
628 | transperline = q->width * q->bpp; | |
629 | divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
630 | q->transfer_scale; | |
631 | transperline = (transperline + divisor - 1) / divisor; | |
632 | ||
d56410e0 | 633 | for (i = 0, yield = yieldlines; i < linestotrans; i++) |
1da177e4 | 634 | { |
d56410e0 | 635 | for (pixels_read = j = 0; j < transperline; j++) |
1da177e4 LT |
636 | { |
637 | bytes = qc_readbytes(q, buffer); | |
d56410e0 | 638 | for (k = 0; k < bytes && (pixels_read + k) < pixels_per_line; k++) |
1da177e4 LT |
639 | { |
640 | int o; | |
d56410e0 | 641 | if (buffer[k] == 0 && invert == 16) |
1da177e4 LT |
642 | { |
643 | /* 4bpp is odd (again) -- inverter is 16, not 15, but output | |
644 | must be 0-15 -- bls */ | |
645 | buffer[k] = 16; | |
646 | } | |
647 | o=i*pixels_per_line + pixels_read + k; | |
648 | if(o<len) | |
649 | { | |
650 | got++; | |
651 | put_user((invert - buffer[k])<<shift, buf+o); | |
652 | } | |
653 | } | |
654 | pixels_read += bytes; | |
655 | } | |
656 | (void) qc_readbytes(q, NULL); /* reset state machine */ | |
d56410e0 | 657 | |
1da177e4 LT |
658 | /* Grabbing an entire frame from the quickcam is a lengthy |
659 | process. We don't (usually) want to busy-block the | |
660 | processor for the entire frame. yieldlines is a module | |
661 | parameter. If we yield every line, the minimum frame | |
662 | time will be 240 / 200 = 1.2 seconds. The compile-time | |
663 | default is to yield every 4 lines. */ | |
664 | if (i >= yield) { | |
665 | msleep_interruptible(5); | |
666 | yield = i + yieldlines; | |
667 | } | |
668 | } | |
669 | ||
d56410e0 | 670 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
671 | { |
672 | write_lpcontrol(q, 2); | |
673 | write_lpcontrol(q, 6); | |
674 | udelay(3); | |
675 | write_lpcontrol(q, 0xe); | |
676 | } | |
677 | if(got<len) | |
678 | return got; | |
679 | return len; | |
680 | } | |
681 | ||
682 | /* | |
683 | * Video4linux interfacing | |
684 | */ | |
685 | ||
686 | static int qcam_do_ioctl(struct inode *inode, struct file *file, | |
687 | unsigned int cmd, void *arg) | |
688 | { | |
689 | struct video_device *dev = video_devdata(file); | |
690 | struct qcam_device *qcam=(struct qcam_device *)dev; | |
d56410e0 | 691 | |
1da177e4 LT |
692 | switch(cmd) |
693 | { | |
694 | case VIDIOCGCAP: | |
695 | { | |
696 | struct video_capability *b = arg; | |
697 | strcpy(b->name, "Quickcam"); | |
698 | b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES|VID_TYPE_MONOCHROME; | |
699 | b->channels = 1; | |
700 | b->audios = 0; | |
701 | b->maxwidth = 320; | |
702 | b->maxheight = 240; | |
703 | b->minwidth = 80; | |
704 | b->minheight = 60; | |
705 | return 0; | |
706 | } | |
707 | case VIDIOCGCHAN: | |
708 | { | |
709 | struct video_channel *v = arg; | |
710 | if(v->channel!=0) | |
711 | return -EINVAL; | |
712 | v->flags=0; | |
713 | v->tuners=0; | |
714 | /* Good question.. its composite or SVHS so.. */ | |
715 | v->type = VIDEO_TYPE_CAMERA; | |
716 | strcpy(v->name, "Camera"); | |
717 | return 0; | |
718 | } | |
719 | case VIDIOCSCHAN: | |
720 | { | |
721 | struct video_channel *v = arg; | |
722 | if(v->channel!=0) | |
723 | return -EINVAL; | |
724 | return 0; | |
725 | } | |
726 | case VIDIOCGTUNER: | |
727 | { | |
728 | struct video_tuner *v = arg; | |
729 | if(v->tuner) | |
730 | return -EINVAL; | |
731 | strcpy(v->name, "Format"); | |
732 | v->rangelow=0; | |
733 | v->rangehigh=0; | |
734 | v->flags= 0; | |
735 | v->mode = VIDEO_MODE_AUTO; | |
736 | return 0; | |
737 | } | |
738 | case VIDIOCSTUNER: | |
739 | { | |
740 | struct video_tuner *v = arg; | |
741 | if(v->tuner) | |
742 | return -EINVAL; | |
743 | if(v->mode!=VIDEO_MODE_AUTO) | |
744 | return -EINVAL; | |
745 | return 0; | |
746 | } | |
747 | case VIDIOCGPICT: | |
748 | { | |
749 | struct video_picture *p = arg; | |
750 | p->colour=0x8000; | |
751 | p->hue=0x8000; | |
752 | p->brightness=qcam->brightness<<8; | |
753 | p->contrast=qcam->contrast<<8; | |
754 | p->whiteness=qcam->whitebal<<8; | |
755 | p->depth=qcam->bpp; | |
756 | p->palette=VIDEO_PALETTE_GREY; | |
757 | return 0; | |
758 | } | |
759 | case VIDIOCSPICT: | |
760 | { | |
761 | struct video_picture *p = arg; | |
762 | if(p->palette!=VIDEO_PALETTE_GREY) | |
763 | return -EINVAL; | |
764 | if(p->depth!=4 && p->depth!=6) | |
765 | return -EINVAL; | |
d56410e0 | 766 | |
1da177e4 LT |
767 | /* |
768 | * Now load the camera. | |
769 | */ | |
770 | ||
771 | qcam->brightness = p->brightness>>8; | |
772 | qcam->contrast = p->contrast>>8; | |
773 | qcam->whitebal = p->whiteness>>8; | |
774 | qcam->bpp = p->depth; | |
775 | ||
3593cab5 | 776 | mutex_lock(&qcam->lock); |
1da177e4 | 777 | qc_setscanmode(qcam); |
3593cab5 | 778 | mutex_unlock(&qcam->lock); |
1da177e4 LT |
779 | qcam->status |= QC_PARAM_CHANGE; |
780 | ||
781 | return 0; | |
782 | } | |
783 | case VIDIOCSWIN: | |
784 | { | |
785 | struct video_window *vw = arg; | |
786 | if(vw->flags) | |
787 | return -EINVAL; | |
788 | if(vw->clipcount) | |
789 | return -EINVAL; | |
790 | if(vw->height<60||vw->height>240) | |
791 | return -EINVAL; | |
792 | if(vw->width<80||vw->width>320) | |
793 | return -EINVAL; | |
d56410e0 | 794 | |
1da177e4 LT |
795 | qcam->width = 320; |
796 | qcam->height = 240; | |
797 | qcam->transfer_scale = 4; | |
d56410e0 | 798 | |
1da177e4 LT |
799 | if(vw->width>=160 && vw->height>=120) |
800 | { | |
801 | qcam->transfer_scale = 2; | |
802 | } | |
803 | if(vw->width>=320 && vw->height>=240) | |
804 | { | |
805 | qcam->width = 320; | |
806 | qcam->height = 240; | |
807 | qcam->transfer_scale = 1; | |
808 | } | |
3593cab5 | 809 | mutex_lock(&qcam->lock); |
1da177e4 | 810 | qc_setscanmode(qcam); |
3593cab5 | 811 | mutex_unlock(&qcam->lock); |
d56410e0 | 812 | |
1da177e4 LT |
813 | /* We must update the camera before we grab. We could |
814 | just have changed the grab size */ | |
815 | qcam->status |= QC_PARAM_CHANGE; | |
d56410e0 | 816 | |
1da177e4 LT |
817 | /* Ok we figured out what to use from our wide choice */ |
818 | return 0; | |
819 | } | |
820 | case VIDIOCGWIN: | |
821 | { | |
822 | struct video_window *vw = arg; | |
823 | memset(vw, 0, sizeof(*vw)); | |
824 | vw->width=qcam->width/qcam->transfer_scale; | |
825 | vw->height=qcam->height/qcam->transfer_scale; | |
826 | return 0; | |
827 | } | |
828 | case VIDIOCKEY: | |
829 | return 0; | |
830 | case VIDIOCCAPTURE: | |
831 | case VIDIOCGFBUF: | |
832 | case VIDIOCSFBUF: | |
833 | case VIDIOCGFREQ: | |
834 | case VIDIOCSFREQ: | |
835 | case VIDIOCGAUDIO: | |
836 | case VIDIOCSAUDIO: | |
837 | return -EINVAL; | |
838 | default: | |
839 | return -ENOIOCTLCMD; | |
840 | } | |
841 | return 0; | |
842 | } | |
843 | ||
844 | static int qcam_ioctl(struct inode *inode, struct file *file, | |
845 | unsigned int cmd, unsigned long arg) | |
846 | { | |
847 | return video_usercopy(inode, file, cmd, arg, qcam_do_ioctl); | |
848 | } | |
849 | ||
850 | static ssize_t qcam_read(struct file *file, char __user *buf, | |
851 | size_t count, loff_t *ppos) | |
852 | { | |
853 | struct video_device *v = video_devdata(file); | |
854 | struct qcam_device *qcam=(struct qcam_device *)v; | |
855 | int len; | |
856 | parport_claim_or_block(qcam->pdev); | |
d56410e0 | 857 | |
3593cab5 | 858 | mutex_lock(&qcam->lock); |
d56410e0 | 859 | |
1da177e4 LT |
860 | qc_reset(qcam); |
861 | ||
862 | /* Update the camera parameters if we need to */ | |
863 | if (qcam->status & QC_PARAM_CHANGE) | |
864 | qc_set(qcam); | |
865 | ||
866 | len=qc_capture(qcam, buf,count); | |
d56410e0 | 867 | |
3593cab5 | 868 | mutex_unlock(&qcam->lock); |
d56410e0 | 869 | |
1da177e4 LT |
870 | parport_release(qcam->pdev); |
871 | return len; | |
872 | } | |
d56410e0 | 873 | |
1da177e4 LT |
874 | static struct file_operations qcam_fops = { |
875 | .owner = THIS_MODULE, | |
876 | .open = video_exclusive_open, | |
877 | .release = video_exclusive_release, | |
878 | .ioctl = qcam_ioctl, | |
0d0fbf81 | 879 | .compat_ioctl = v4l_compat_ioctl32, |
1da177e4 LT |
880 | .read = qcam_read, |
881 | .llseek = no_llseek, | |
882 | }; | |
883 | static struct video_device qcam_template= | |
884 | { | |
885 | .owner = THIS_MODULE, | |
886 | .name = "Connectix Quickcam", | |
887 | .type = VID_TYPE_CAPTURE, | |
888 | .hardware = VID_HARDWARE_QCAM_BW, | |
889 | .fops = &qcam_fops, | |
890 | }; | |
891 | ||
892 | #define MAX_CAMS 4 | |
893 | static struct qcam_device *qcams[MAX_CAMS]; | |
894 | static unsigned int num_cams = 0; | |
895 | ||
896 | static int init_bwqcam(struct parport *port) | |
897 | { | |
898 | struct qcam_device *qcam; | |
899 | ||
900 | if (num_cams == MAX_CAMS) | |
901 | { | |
902 | printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS); | |
903 | return -ENOSPC; | |
904 | } | |
905 | ||
906 | qcam=qcam_init(port); | |
907 | if(qcam==NULL) | |
908 | return -ENODEV; | |
d56410e0 | 909 | |
1da177e4 LT |
910 | parport_claim_or_block(qcam->pdev); |
911 | ||
912 | qc_reset(qcam); | |
d56410e0 | 913 | |
1da177e4 LT |
914 | if(qc_detect(qcam)==0) |
915 | { | |
916 | parport_release(qcam->pdev); | |
917 | parport_unregister_device(qcam->pdev); | |
918 | kfree(qcam); | |
919 | return -ENODEV; | |
920 | } | |
921 | qc_calibrate(qcam); | |
922 | ||
923 | parport_release(qcam->pdev); | |
d56410e0 | 924 | |
1da177e4 | 925 | printk(KERN_INFO "Connectix Quickcam on %s\n", qcam->pport->name); |
d56410e0 | 926 | |
1da177e4 LT |
927 | if(video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1) |
928 | { | |
929 | parport_unregister_device(qcam->pdev); | |
930 | kfree(qcam); | |
931 | return -ENODEV; | |
932 | } | |
933 | ||
934 | qcams[num_cams++] = qcam; | |
935 | ||
936 | return 0; | |
937 | } | |
938 | ||
939 | static void close_bwqcam(struct qcam_device *qcam) | |
940 | { | |
941 | video_unregister_device(&qcam->vdev); | |
942 | parport_unregister_device(qcam->pdev); | |
943 | kfree(qcam); | |
944 | } | |
945 | ||
946 | /* The parport parameter controls which parports will be scanned. | |
947 | * Scanning all parports causes some printers to print a garbage page. | |
948 | * -- March 14, 1999 Billy Donahue <billy@escape.com> */ | |
949 | #ifdef MODULE | |
950 | static char *parport[MAX_CAMS] = { NULL, }; | |
951 | module_param_array(parport, charp, NULL, 0); | |
952 | #endif | |
953 | ||
954 | static int accept_bwqcam(struct parport *port) | |
955 | { | |
956 | #ifdef MODULE | |
957 | int n; | |
958 | ||
959 | if (parport[0] && strncmp(parport[0], "auto", 4) != 0) { | |
960 | /* user gave parport parameters */ | |
961 | for(n=0; parport[n] && n<MAX_CAMS; n++){ | |
962 | char *ep; | |
963 | unsigned long r; | |
964 | r = simple_strtoul(parport[n], &ep, 0); | |
965 | if (ep == parport[n]) { | |
966 | printk(KERN_ERR | |
967 | "bw-qcam: bad port specifier \"%s\"\n", | |
968 | parport[n]); | |
969 | continue; | |
970 | } | |
971 | if (r == port->number) | |
972 | return 1; | |
973 | } | |
974 | return 0; | |
975 | } | |
976 | #endif | |
977 | return 1; | |
978 | } | |
979 | ||
980 | static void bwqcam_attach(struct parport *port) | |
981 | { | |
982 | if (accept_bwqcam(port)) | |
983 | init_bwqcam(port); | |
984 | } | |
985 | ||
986 | static void bwqcam_detach(struct parport *port) | |
987 | { | |
988 | int i; | |
989 | for (i = 0; i < num_cams; i++) { | |
990 | struct qcam_device *qcam = qcams[i]; | |
991 | if (qcam && qcam->pdev->port == port) { | |
992 | qcams[i] = NULL; | |
993 | close_bwqcam(qcam); | |
994 | } | |
995 | } | |
996 | } | |
997 | ||
998 | static struct parport_driver bwqcam_driver = { | |
999 | .name = "bw-qcam", | |
1000 | .attach = bwqcam_attach, | |
1001 | .detach = bwqcam_detach, | |
1002 | }; | |
1003 | ||
1004 | static void __exit exit_bw_qcams(void) | |
1005 | { | |
1006 | parport_unregister_driver(&bwqcam_driver); | |
1007 | } | |
1008 | ||
1009 | static int __init init_bw_qcams(void) | |
1010 | { | |
1011 | #ifdef MODULE | |
1012 | /* Do some sanity checks on the module parameters. */ | |
1013 | if (maxpoll > 5000) { | |
1014 | printk("Connectix Quickcam max-poll was above 5000. Using 5000.\n"); | |
1015 | maxpoll = 5000; | |
1016 | } | |
d56410e0 | 1017 | |
1da177e4 LT |
1018 | if (yieldlines < 1) { |
1019 | printk("Connectix Quickcam yieldlines was less than 1. Using 1.\n"); | |
1020 | yieldlines = 1; | |
1021 | } | |
1022 | #endif | |
1023 | return parport_register_driver(&bwqcam_driver); | |
1024 | } | |
1025 | ||
1026 | module_init(init_bw_qcams); | |
1027 | module_exit(exit_bw_qcams); | |
1028 | ||
1029 | MODULE_LICENSE("GPL"); |