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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; | |
d685a483 | 85 | static unsigned int force_init; /* Whether to probe aggressively */ |
1da177e4 LT |
86 | |
87 | module_param(maxpoll, int, 0); | |
88 | module_param(yieldlines, int, 0); | |
89 | module_param(video_nr, int, 0); | |
90 | ||
d685a483 BW |
91 | /* Set force_init=1 to avoid detection by polling status register and |
92 | * immediately attempt to initialize qcam */ | |
93 | module_param(force_init, int, 0); | |
94 | ||
1da177e4 LT |
95 | static inline int read_lpstatus(struct qcam_device *q) |
96 | { | |
97 | return parport_read_status(q->pport); | |
98 | } | |
99 | ||
100 | static inline int read_lpdata(struct qcam_device *q) | |
101 | { | |
102 | return parport_read_data(q->pport); | |
103 | } | |
104 | ||
105 | static inline void write_lpdata(struct qcam_device *q, int d) | |
106 | { | |
107 | parport_write_data(q->pport, d); | |
108 | } | |
109 | ||
110 | static inline void write_lpcontrol(struct qcam_device *q, int d) | |
111 | { | |
7c596fa9 | 112 | if (d & 0x20) { |
9e19db5b BW |
113 | /* Set bidirectional mode to reverse (data in) */ |
114 | parport_data_reverse(q->pport); | |
115 | } else { | |
116 | /* Set bidirectional mode to forward (data out) */ | |
117 | parport_data_forward(q->pport); | |
118 | } | |
119 | ||
120 | /* Now issue the regular port command, but strip out the | |
121 | * direction flag */ | |
122 | d &= ~0x20; | |
1da177e4 LT |
123 | parport_write_control(q->pport, d); |
124 | } | |
125 | ||
126 | static int qc_waithand(struct qcam_device *q, int val); | |
127 | static int qc_command(struct qcam_device *q, int command); | |
128 | static int qc_readparam(struct qcam_device *q); | |
129 | static int qc_setscanmode(struct qcam_device *q); | |
130 | static int qc_readbytes(struct qcam_device *q, char buffer[]); | |
131 | ||
132 | static struct video_device qcam_template; | |
133 | ||
134 | static int qc_calibrate(struct qcam_device *q) | |
135 | { | |
136 | /* | |
137 | * Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96 | |
138 | * The white balance is an individiual value for each | |
139 | * quickcam. | |
140 | */ | |
141 | ||
142 | int value; | |
143 | int count = 0; | |
144 | ||
145 | qc_command(q, 27); /* AutoAdjustOffset */ | |
146 | qc_command(q, 0); /* Dummy Parameter, ignored by the camera */ | |
147 | ||
148 | /* GetOffset (33) will read 255 until autocalibration */ | |
149 | /* is finished. After that, a value of 1-254 will be */ | |
150 | /* returned. */ | |
151 | ||
152 | do { | |
153 | qc_command(q, 33); | |
154 | value = qc_readparam(q); | |
155 | mdelay(1); | |
156 | schedule(); | |
157 | count++; | |
158 | } while (value == 0xff && count<2048); | |
159 | ||
160 | q->whitebal = value; | |
161 | return value; | |
162 | } | |
163 | ||
164 | /* Initialize the QuickCam driver control structure. This is where | |
165 | * defaults are set for people who don't have a config file.*/ | |
166 | ||
167 | static struct qcam_device *qcam_init(struct parport *port) | |
168 | { | |
169 | struct qcam_device *q; | |
d56410e0 | 170 | |
1da177e4 LT |
171 | q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL); |
172 | if(q==NULL) | |
173 | return NULL; | |
174 | ||
175 | q->pport = port; | |
176 | q->pdev = parport_register_device(port, "bw-qcam", NULL, NULL, | |
177 | NULL, 0, NULL); | |
d56410e0 | 178 | if (q->pdev == NULL) |
1da177e4 LT |
179 | { |
180 | printk(KERN_ERR "bw-qcam: couldn't register for %s.\n", | |
181 | port->name); | |
182 | kfree(q); | |
183 | return NULL; | |
184 | } | |
d56410e0 | 185 | |
1da177e4 | 186 | memcpy(&q->vdev, &qcam_template, sizeof(qcam_template)); |
d56410e0 | 187 | |
3593cab5 | 188 | mutex_init(&q->lock); |
1da177e4 LT |
189 | |
190 | q->port_mode = (QC_ANY | QC_NOTSET); | |
191 | q->width = 320; | |
192 | q->height = 240; | |
193 | q->bpp = 4; | |
194 | q->transfer_scale = 2; | |
195 | q->contrast = 192; | |
196 | q->brightness = 180; | |
197 | q->whitebal = 105; | |
198 | q->top = 1; | |
199 | q->left = 14; | |
200 | q->mode = -1; | |
201 | q->status = QC_PARAM_CHANGE; | |
202 | return q; | |
203 | } | |
204 | ||
205 | ||
206 | /* qc_command is probably a bit of a misnomer -- it's used to send | |
207 | * bytes *to* the camera. Generally, these bytes are either commands | |
208 | * or arguments to commands, so the name fits, but it still bugs me a | |
209 | * bit. See the documentation for a list of commands. */ | |
210 | ||
211 | static int qc_command(struct qcam_device *q, int command) | |
212 | { | |
213 | int n1, n2; | |
214 | int cmd; | |
215 | ||
216 | write_lpdata(q, command); | |
217 | write_lpcontrol(q, 6); | |
218 | ||
219 | n1 = qc_waithand(q, 1); | |
220 | ||
221 | write_lpcontrol(q, 0xe); | |
222 | n2 = qc_waithand(q, 0); | |
223 | ||
224 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
225 | return cmd; | |
226 | } | |
227 | ||
228 | static int qc_readparam(struct qcam_device *q) | |
229 | { | |
230 | int n1, n2; | |
231 | int cmd; | |
232 | ||
233 | write_lpcontrol(q, 6); | |
234 | n1 = qc_waithand(q, 1); | |
235 | ||
236 | write_lpcontrol(q, 0xe); | |
237 | n2 = qc_waithand(q, 0); | |
238 | ||
239 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
240 | return cmd; | |
241 | } | |
242 | ||
243 | /* qc_waithand busy-waits for a handshake signal from the QuickCam. | |
244 | * Almost all communication with the camera requires handshaking. */ | |
245 | ||
246 | static int qc_waithand(struct qcam_device *q, int val) | |
247 | { | |
248 | int status; | |
249 | int runs=0; | |
250 | ||
251 | if (val) | |
252 | { | |
253 | while (!((status = read_lpstatus(q)) & 8)) | |
254 | { | |
255 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 256 | cases, at that point we start to poll slowly |
1da177e4 LT |
257 | until the camera wakes up. However, we are |
258 | busy blocked until the camera responds, so | |
259 | setting it lower is much better for interactive | |
260 | response. */ | |
d56410e0 | 261 | |
1da177e4 LT |
262 | if(runs++>maxpoll) |
263 | { | |
264 | msleep_interruptible(5); | |
265 | } | |
266 | if(runs>(maxpoll+1000)) /* 5 seconds */ | |
267 | return -1; | |
268 | } | |
269 | } | |
270 | else | |
271 | { | |
272 | while (((status = read_lpstatus(q)) & 8)) | |
273 | { | |
274 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 275 | cases, at that point we start to poll slowly |
1da177e4 LT |
276 | until the camera wakes up. However, we are |
277 | busy blocked until the camera responds, so | |
278 | setting it lower is much better for interactive | |
279 | response. */ | |
d56410e0 | 280 | |
1da177e4 LT |
281 | if(runs++>maxpoll) |
282 | { | |
283 | msleep_interruptible(5); | |
284 | } | |
285 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
286 | return -1; | |
287 | } | |
288 | } | |
289 | ||
290 | return status; | |
291 | } | |
292 | ||
293 | /* Waithand2 is used when the qcam is in bidirectional mode, and the | |
294 | * handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1 | |
295 | * (bit 3 of status register). It also returns the last value read, | |
296 | * since this data is useful. */ | |
297 | ||
298 | static unsigned int qc_waithand2(struct qcam_device *q, int val) | |
299 | { | |
300 | unsigned int status; | |
301 | int runs=0; | |
d56410e0 MCC |
302 | |
303 | do | |
1da177e4 LT |
304 | { |
305 | status = read_lpdata(q); | |
306 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 307 | cases, at that point we start to poll slowly |
1da177e4 LT |
308 | until the camera wakes up. However, we are |
309 | busy blocked until the camera responds, so | |
310 | setting it lower is much better for interactive | |
311 | response. */ | |
d56410e0 | 312 | |
1da177e4 LT |
313 | if(runs++>maxpoll) |
314 | { | |
315 | msleep_interruptible(5); | |
316 | } | |
317 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
318 | return 0; | |
319 | } | |
320 | while ((status & 1) != val); | |
321 | ||
322 | return status; | |
323 | } | |
324 | ||
325 | ||
326 | /* Try to detect a QuickCam. It appears to flash the upper 4 bits of | |
327 | the status register at 5-10 Hz. This is only used in the autoprobe | |
328 | code. Be aware that this isn't the way Connectix detects the | |
329 | camera (they send a reset and try to handshake), but this should be | |
330 | almost completely safe, while their method screws up my printer if | |
331 | I plug it in before the camera. */ | |
332 | ||
333 | static int qc_detect(struct qcam_device *q) | |
334 | { | |
335 | int reg, lastreg; | |
336 | int count = 0; | |
337 | int i; | |
338 | ||
d685a483 BW |
339 | if (force_init) |
340 | return 1; | |
341 | ||
1da177e4 LT |
342 | lastreg = reg = read_lpstatus(q) & 0xf0; |
343 | ||
d56410e0 | 344 | for (i = 0; i < 500; i++) |
1da177e4 LT |
345 | { |
346 | reg = read_lpstatus(q) & 0xf0; | |
347 | if (reg != lastreg) | |
348 | count++; | |
349 | lastreg = reg; | |
350 | mdelay(2); | |
351 | } | |
352 | ||
353 | ||
354 | #if 0 | |
355 | /* Force camera detection during testing. Sometimes the camera | |
356 | won't be flashing these bits. Possibly unloading the module | |
357 | in the middle of a grab? Or some timeout condition? | |
358 | I've seen this parameter as low as 19 on my 450Mhz box - mpc */ | |
359 | printk("Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count); | |
360 | return 1; | |
361 | #endif | |
362 | ||
363 | /* Be (even more) liberal in what you accept... */ | |
364 | ||
7c596fa9 | 365 | if (count > 20 && count < 400) { |
1da177e4 | 366 | return 1; /* found */ |
9e19db5b | 367 | } else { |
7c596fa9 BW |
368 | printk(KERN_ERR "No Quickcam found on port %s\n", |
369 | q->pport->name); | |
d685a483 | 370 | printk(KERN_DEBUG "Quickcam detection counter: %u\n", count); |
1da177e4 | 371 | return 0; /* not found */ |
9e19db5b | 372 | } |
1da177e4 LT |
373 | } |
374 | ||
375 | ||
376 | /* Reset the QuickCam. This uses the same sequence the Windows | |
377 | * QuickPic program uses. Someone with a bi-directional port should | |
378 | * check that bi-directional mode is detected right, and then | |
379 | * implement bi-directional mode in qc_readbyte(). */ | |
380 | ||
381 | static void qc_reset(struct qcam_device *q) | |
382 | { | |
d56410e0 | 383 | switch (q->port_mode & QC_FORCE_MASK) |
1da177e4 LT |
384 | { |
385 | case QC_FORCE_UNIDIR: | |
386 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
387 | break; | |
388 | ||
389 | case QC_FORCE_BIDIR: | |
390 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
391 | break; | |
392 | ||
393 | case QC_ANY: | |
394 | write_lpcontrol(q, 0x20); | |
395 | write_lpdata(q, 0x75); | |
d56410e0 | 396 | |
1da177e4 LT |
397 | if (read_lpdata(q) != 0x75) { |
398 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
399 | } else { | |
400 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
401 | } | |
402 | break; | |
403 | } | |
404 | ||
405 | write_lpcontrol(q, 0xb); | |
406 | udelay(250); | |
407 | write_lpcontrol(q, 0xe); | |
408 | qc_setscanmode(q); /* in case port_mode changed */ | |
409 | } | |
410 | ||
411 | ||
412 | /* Decide which scan mode to use. There's no real requirement that | |
413 | * the scanmode match the resolution in q->height and q-> width -- the | |
414 | * camera takes the picture at the resolution specified in the | |
415 | * "scanmode" and then returns the image at the resolution specified | |
416 | * with the resolution commands. If the scan is bigger than the | |
417 | * requested resolution, the upper-left hand corner of the scan is | |
418 | * returned. If the scan is smaller, then the rest of the image | |
419 | * returned contains garbage. */ | |
420 | ||
421 | static int qc_setscanmode(struct qcam_device *q) | |
422 | { | |
423 | int old_mode = q->mode; | |
d56410e0 MCC |
424 | |
425 | switch (q->transfer_scale) | |
1da177e4 LT |
426 | { |
427 | case 1: | |
428 | q->mode = 0; | |
429 | break; | |
430 | case 2: | |
431 | q->mode = 4; | |
432 | break; | |
433 | case 4: | |
434 | q->mode = 8; | |
435 | break; | |
436 | } | |
437 | ||
d56410e0 | 438 | switch (q->bpp) |
1da177e4 LT |
439 | { |
440 | case 4: | |
441 | break; | |
442 | case 6: | |
443 | q->mode += 2; | |
444 | break; | |
445 | } | |
446 | ||
d56410e0 | 447 | switch (q->port_mode & QC_MODE_MASK) |
1da177e4 LT |
448 | { |
449 | case QC_BIDIR: | |
450 | q->mode += 1; | |
451 | break; | |
452 | case QC_NOTSET: | |
453 | case QC_UNIDIR: | |
454 | break; | |
455 | } | |
d56410e0 | 456 | |
1da177e4 LT |
457 | if (q->mode != old_mode) |
458 | q->status |= QC_PARAM_CHANGE; | |
d56410e0 | 459 | |
1da177e4 LT |
460 | return 0; |
461 | } | |
462 | ||
463 | ||
464 | /* Reset the QuickCam and program for brightness, contrast, | |
465 | * white-balance, and resolution. */ | |
466 | ||
467 | static void qc_set(struct qcam_device *q) | |
468 | { | |
469 | int val; | |
470 | int val2; | |
471 | ||
472 | qc_reset(q); | |
473 | ||
474 | /* Set the brightness. Yes, this is repetitive, but it works. | |
475 | * Shorter versions seem to fail subtly. Feel free to try :-). */ | |
476 | /* I think the problem was in qc_command, not here -- bls */ | |
d56410e0 | 477 | |
1da177e4 LT |
478 | qc_command(q, 0xb); |
479 | qc_command(q, q->brightness); | |
480 | ||
481 | val = q->height / q->transfer_scale; | |
482 | qc_command(q, 0x11); | |
483 | qc_command(q, val); | |
484 | if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) { | |
485 | /* The normal "transfers per line" calculation doesn't seem to work | |
486 | as expected here (and yet it works fine in qc_scan). No idea | |
487 | why this case is the odd man out. Fortunately, Laird's original | |
488 | working version gives me a good way to guess at working values. | |
489 | -- bls */ | |
490 | val = q->width; | |
491 | val2 = q->transfer_scale * 4; | |
492 | } else { | |
493 | val = q->width * q->bpp; | |
494 | val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
495 | q->transfer_scale; | |
496 | } | |
497 | val = (val + val2 - 1) / val2; | |
498 | qc_command(q, 0x13); | |
499 | qc_command(q, val); | |
500 | ||
501 | /* Setting top and left -- bls */ | |
502 | qc_command(q, 0xd); | |
503 | qc_command(q, q->top); | |
504 | qc_command(q, 0xf); | |
505 | qc_command(q, q->left / 2); | |
506 | ||
507 | qc_command(q, 0x19); | |
508 | qc_command(q, q->contrast); | |
509 | qc_command(q, 0x1f); | |
510 | qc_command(q, q->whitebal); | |
511 | ||
512 | /* Clear flag that we must update the grabbing parameters on the camera | |
513 | before we grab the next frame */ | |
514 | q->status &= (~QC_PARAM_CHANGE); | |
515 | } | |
516 | ||
517 | /* Qc_readbytes reads some bytes from the QC and puts them in | |
518 | the supplied buffer. It returns the number of bytes read, | |
519 | or -1 on error. */ | |
520 | ||
521 | static inline int qc_readbytes(struct qcam_device *q, char buffer[]) | |
522 | { | |
523 | int ret=1; | |
524 | unsigned int hi, lo; | |
525 | unsigned int hi2, lo2; | |
ff699e6b | 526 | static int state; |
1da177e4 | 527 | |
d56410e0 | 528 | if (buffer == NULL) |
1da177e4 LT |
529 | { |
530 | state = 0; | |
531 | return 0; | |
532 | } | |
d56410e0 MCC |
533 | |
534 | switch (q->port_mode & QC_MODE_MASK) | |
1da177e4 LT |
535 | { |
536 | case QC_BIDIR: /* Bi-directional Port */ | |
537 | write_lpcontrol(q, 0x26); | |
538 | lo = (qc_waithand2(q, 1) >> 1); | |
539 | hi = (read_lpstatus(q) >> 3) & 0x1f; | |
540 | write_lpcontrol(q, 0x2e); | |
541 | lo2 = (qc_waithand2(q, 0) >> 1); | |
542 | hi2 = (read_lpstatus(q) >> 3) & 0x1f; | |
d56410e0 | 543 | switch (q->bpp) |
1da177e4 LT |
544 | { |
545 | case 4: | |
546 | buffer[0] = lo & 0xf; | |
547 | buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3); | |
548 | buffer[2] = (hi & 0x1e) >> 1; | |
549 | buffer[3] = lo2 & 0xf; | |
550 | buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3); | |
551 | buffer[5] = (hi2 & 0x1e) >> 1; | |
552 | ret = 6; | |
553 | break; | |
554 | case 6: | |
555 | buffer[0] = lo & 0x3f; | |
556 | buffer[1] = ((lo & 0x40) >> 6) | (hi << 1); | |
557 | buffer[2] = lo2 & 0x3f; | |
558 | buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1); | |
559 | ret = 4; | |
560 | break; | |
561 | } | |
562 | break; | |
563 | ||
564 | case QC_UNIDIR: /* Unidirectional Port */ | |
565 | write_lpcontrol(q, 6); | |
566 | lo = (qc_waithand(q, 1) & 0xf0) >> 4; | |
567 | write_lpcontrol(q, 0xe); | |
568 | hi = (qc_waithand(q, 0) & 0xf0) >> 4; | |
569 | ||
d56410e0 | 570 | switch (q->bpp) |
1da177e4 LT |
571 | { |
572 | case 4: | |
573 | buffer[0] = lo; | |
574 | buffer[1] = hi; | |
575 | ret = 2; | |
576 | break; | |
577 | case 6: | |
d56410e0 | 578 | switch (state) |
1da177e4 LT |
579 | { |
580 | case 0: | |
581 | buffer[0] = (lo << 2) | ((hi & 0xc) >> 2); | |
582 | q->saved_bits = (hi & 3) << 4; | |
583 | state = 1; | |
584 | ret = 1; | |
585 | break; | |
586 | case 1: | |
587 | buffer[0] = lo | q->saved_bits; | |
588 | q->saved_bits = hi << 2; | |
589 | state = 2; | |
590 | ret = 1; | |
591 | break; | |
592 | case 2: | |
593 | buffer[0] = ((lo & 0xc) >> 2) | q->saved_bits; | |
594 | buffer[1] = ((lo & 3) << 4) | hi; | |
595 | state = 0; | |
596 | ret = 2; | |
597 | break; | |
598 | } | |
599 | break; | |
600 | } | |
601 | break; | |
602 | } | |
603 | return ret; | |
604 | } | |
605 | ||
606 | /* requests a scan from the camera. It sends the correct instructions | |
607 | * to the camera and then reads back the correct number of bytes. In | |
608 | * previous versions of this routine the return structure contained | |
609 | * the raw output from the camera, and there was a 'qc_convertscan' | |
610 | * function that converted that to a useful format. In version 0.3 I | |
611 | * rolled qc_convertscan into qc_scan and now I only return the | |
612 | * converted scan. The format is just an one-dimensional array of | |
613 | * characters, one for each pixel, with 0=black up to n=white, where | |
614 | * n=2^(bit depth)-1. Ask me for more details if you don't understand | |
615 | * this. */ | |
616 | ||
617 | static long qc_capture(struct qcam_device * q, char __user *buf, unsigned long len) | |
618 | { | |
619 | int i, j, k, yield; | |
620 | int bytes; | |
621 | int linestotrans, transperline; | |
622 | int divisor; | |
623 | int pixels_per_line; | |
624 | int pixels_read = 0; | |
625 | int got=0; | |
626 | char buffer[6]; | |
627 | int shift=8-q->bpp; | |
628 | char invert; | |
629 | ||
d56410e0 | 630 | if (q->mode == -1) |
1da177e4 LT |
631 | return -ENXIO; |
632 | ||
633 | qc_command(q, 0x7); | |
634 | qc_command(q, q->mode); | |
635 | ||
d56410e0 | 636 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
637 | { |
638 | write_lpcontrol(q, 0x2e); /* turn port around */ | |
639 | write_lpcontrol(q, 0x26); | |
640 | (void) qc_waithand(q, 1); | |
641 | write_lpcontrol(q, 0x2e); | |
642 | (void) qc_waithand(q, 0); | |
643 | } | |
d56410e0 | 644 | |
1da177e4 LT |
645 | /* strange -- should be 15:63 below, but 4bpp is odd */ |
646 | invert = (q->bpp == 4) ? 16 : 63; | |
647 | ||
648 | linestotrans = q->height / q->transfer_scale; | |
649 | pixels_per_line = q->width / q->transfer_scale; | |
650 | transperline = q->width * q->bpp; | |
651 | divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
652 | q->transfer_scale; | |
653 | transperline = (transperline + divisor - 1) / divisor; | |
654 | ||
d56410e0 | 655 | for (i = 0, yield = yieldlines; i < linestotrans; i++) |
1da177e4 | 656 | { |
d56410e0 | 657 | for (pixels_read = j = 0; j < transperline; j++) |
1da177e4 LT |
658 | { |
659 | bytes = qc_readbytes(q, buffer); | |
d56410e0 | 660 | for (k = 0; k < bytes && (pixels_read + k) < pixels_per_line; k++) |
1da177e4 LT |
661 | { |
662 | int o; | |
d56410e0 | 663 | if (buffer[k] == 0 && invert == 16) |
1da177e4 LT |
664 | { |
665 | /* 4bpp is odd (again) -- inverter is 16, not 15, but output | |
666 | must be 0-15 -- bls */ | |
667 | buffer[k] = 16; | |
668 | } | |
669 | o=i*pixels_per_line + pixels_read + k; | |
670 | if(o<len) | |
671 | { | |
672 | got++; | |
673 | put_user((invert - buffer[k])<<shift, buf+o); | |
674 | } | |
675 | } | |
676 | pixels_read += bytes; | |
677 | } | |
678 | (void) qc_readbytes(q, NULL); /* reset state machine */ | |
d56410e0 | 679 | |
1da177e4 LT |
680 | /* Grabbing an entire frame from the quickcam is a lengthy |
681 | process. We don't (usually) want to busy-block the | |
682 | processor for the entire frame. yieldlines is a module | |
683 | parameter. If we yield every line, the minimum frame | |
684 | time will be 240 / 200 = 1.2 seconds. The compile-time | |
685 | default is to yield every 4 lines. */ | |
686 | if (i >= yield) { | |
687 | msleep_interruptible(5); | |
688 | yield = i + yieldlines; | |
689 | } | |
690 | } | |
691 | ||
d56410e0 | 692 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
693 | { |
694 | write_lpcontrol(q, 2); | |
695 | write_lpcontrol(q, 6); | |
696 | udelay(3); | |
697 | write_lpcontrol(q, 0xe); | |
698 | } | |
699 | if(got<len) | |
700 | return got; | |
701 | return len; | |
702 | } | |
703 | ||
704 | /* | |
705 | * Video4linux interfacing | |
706 | */ | |
707 | ||
708 | static int qcam_do_ioctl(struct inode *inode, struct file *file, | |
709 | unsigned int cmd, void *arg) | |
710 | { | |
711 | struct video_device *dev = video_devdata(file); | |
712 | struct qcam_device *qcam=(struct qcam_device *)dev; | |
d56410e0 | 713 | |
1da177e4 LT |
714 | switch(cmd) |
715 | { | |
716 | case VIDIOCGCAP: | |
717 | { | |
718 | struct video_capability *b = arg; | |
719 | strcpy(b->name, "Quickcam"); | |
720 | b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES|VID_TYPE_MONOCHROME; | |
721 | b->channels = 1; | |
722 | b->audios = 0; | |
723 | b->maxwidth = 320; | |
724 | b->maxheight = 240; | |
725 | b->minwidth = 80; | |
726 | b->minheight = 60; | |
727 | return 0; | |
728 | } | |
729 | case VIDIOCGCHAN: | |
730 | { | |
731 | struct video_channel *v = arg; | |
732 | if(v->channel!=0) | |
733 | return -EINVAL; | |
734 | v->flags=0; | |
735 | v->tuners=0; | |
736 | /* Good question.. its composite or SVHS so.. */ | |
737 | v->type = VIDEO_TYPE_CAMERA; | |
738 | strcpy(v->name, "Camera"); | |
739 | return 0; | |
740 | } | |
741 | case VIDIOCSCHAN: | |
742 | { | |
743 | struct video_channel *v = arg; | |
744 | if(v->channel!=0) | |
745 | return -EINVAL; | |
746 | return 0; | |
747 | } | |
748 | case VIDIOCGTUNER: | |
749 | { | |
750 | struct video_tuner *v = arg; | |
751 | if(v->tuner) | |
752 | return -EINVAL; | |
753 | strcpy(v->name, "Format"); | |
754 | v->rangelow=0; | |
755 | v->rangehigh=0; | |
756 | v->flags= 0; | |
757 | v->mode = VIDEO_MODE_AUTO; | |
758 | return 0; | |
759 | } | |
760 | case VIDIOCSTUNER: | |
761 | { | |
762 | struct video_tuner *v = arg; | |
763 | if(v->tuner) | |
764 | return -EINVAL; | |
765 | if(v->mode!=VIDEO_MODE_AUTO) | |
766 | return -EINVAL; | |
767 | return 0; | |
768 | } | |
769 | case VIDIOCGPICT: | |
770 | { | |
771 | struct video_picture *p = arg; | |
772 | p->colour=0x8000; | |
773 | p->hue=0x8000; | |
774 | p->brightness=qcam->brightness<<8; | |
775 | p->contrast=qcam->contrast<<8; | |
776 | p->whiteness=qcam->whitebal<<8; | |
777 | p->depth=qcam->bpp; | |
778 | p->palette=VIDEO_PALETTE_GREY; | |
779 | return 0; | |
780 | } | |
781 | case VIDIOCSPICT: | |
782 | { | |
783 | struct video_picture *p = arg; | |
784 | if(p->palette!=VIDEO_PALETTE_GREY) | |
657de3cd | 785 | return -EINVAL; |
1da177e4 LT |
786 | if(p->depth!=4 && p->depth!=6) |
787 | return -EINVAL; | |
d56410e0 | 788 | |
1da177e4 LT |
789 | /* |
790 | * Now load the camera. | |
791 | */ | |
792 | ||
793 | qcam->brightness = p->brightness>>8; | |
794 | qcam->contrast = p->contrast>>8; | |
795 | qcam->whitebal = p->whiteness>>8; | |
796 | qcam->bpp = p->depth; | |
797 | ||
3593cab5 | 798 | mutex_lock(&qcam->lock); |
1da177e4 | 799 | qc_setscanmode(qcam); |
3593cab5 | 800 | mutex_unlock(&qcam->lock); |
1da177e4 LT |
801 | qcam->status |= QC_PARAM_CHANGE; |
802 | ||
803 | return 0; | |
804 | } | |
805 | case VIDIOCSWIN: | |
806 | { | |
807 | struct video_window *vw = arg; | |
808 | if(vw->flags) | |
809 | return -EINVAL; | |
810 | if(vw->clipcount) | |
811 | return -EINVAL; | |
812 | if(vw->height<60||vw->height>240) | |
813 | return -EINVAL; | |
814 | if(vw->width<80||vw->width>320) | |
815 | return -EINVAL; | |
d56410e0 | 816 | |
1da177e4 LT |
817 | qcam->width = 320; |
818 | qcam->height = 240; | |
819 | qcam->transfer_scale = 4; | |
d56410e0 | 820 | |
1da177e4 LT |
821 | if(vw->width>=160 && vw->height>=120) |
822 | { | |
823 | qcam->transfer_scale = 2; | |
824 | } | |
825 | if(vw->width>=320 && vw->height>=240) | |
826 | { | |
827 | qcam->width = 320; | |
828 | qcam->height = 240; | |
829 | qcam->transfer_scale = 1; | |
830 | } | |
3593cab5 | 831 | mutex_lock(&qcam->lock); |
1da177e4 | 832 | qc_setscanmode(qcam); |
3593cab5 | 833 | mutex_unlock(&qcam->lock); |
d56410e0 | 834 | |
1da177e4 LT |
835 | /* We must update the camera before we grab. We could |
836 | just have changed the grab size */ | |
837 | qcam->status |= QC_PARAM_CHANGE; | |
d56410e0 | 838 | |
1da177e4 LT |
839 | /* Ok we figured out what to use from our wide choice */ |
840 | return 0; | |
841 | } | |
842 | case VIDIOCGWIN: | |
843 | { | |
844 | struct video_window *vw = arg; | |
845 | memset(vw, 0, sizeof(*vw)); | |
846 | vw->width=qcam->width/qcam->transfer_scale; | |
847 | vw->height=qcam->height/qcam->transfer_scale; | |
848 | return 0; | |
849 | } | |
850 | case VIDIOCKEY: | |
851 | return 0; | |
852 | case VIDIOCCAPTURE: | |
853 | case VIDIOCGFBUF: | |
854 | case VIDIOCSFBUF: | |
855 | case VIDIOCGFREQ: | |
856 | case VIDIOCSFREQ: | |
857 | case VIDIOCGAUDIO: | |
858 | case VIDIOCSAUDIO: | |
859 | return -EINVAL; | |
860 | default: | |
861 | return -ENOIOCTLCMD; | |
862 | } | |
863 | return 0; | |
864 | } | |
865 | ||
866 | static int qcam_ioctl(struct inode *inode, struct file *file, | |
867 | unsigned int cmd, unsigned long arg) | |
868 | { | |
869 | return video_usercopy(inode, file, cmd, arg, qcam_do_ioctl); | |
870 | } | |
871 | ||
872 | static ssize_t qcam_read(struct file *file, char __user *buf, | |
873 | size_t count, loff_t *ppos) | |
874 | { | |
875 | struct video_device *v = video_devdata(file); | |
876 | struct qcam_device *qcam=(struct qcam_device *)v; | |
877 | int len; | |
878 | parport_claim_or_block(qcam->pdev); | |
d56410e0 | 879 | |
3593cab5 | 880 | mutex_lock(&qcam->lock); |
d56410e0 | 881 | |
1da177e4 LT |
882 | qc_reset(qcam); |
883 | ||
884 | /* Update the camera parameters if we need to */ | |
885 | if (qcam->status & QC_PARAM_CHANGE) | |
886 | qc_set(qcam); | |
887 | ||
888 | len=qc_capture(qcam, buf,count); | |
d56410e0 | 889 | |
3593cab5 | 890 | mutex_unlock(&qcam->lock); |
d56410e0 | 891 | |
1da177e4 LT |
892 | parport_release(qcam->pdev); |
893 | return len; | |
894 | } | |
d56410e0 | 895 | |
fa027c2a | 896 | static const struct file_operations qcam_fops = { |
1da177e4 LT |
897 | .owner = THIS_MODULE, |
898 | .open = video_exclusive_open, | |
899 | .release = video_exclusive_release, | |
900 | .ioctl = qcam_ioctl, | |
0d0fbf81 | 901 | .compat_ioctl = v4l_compat_ioctl32, |
1da177e4 LT |
902 | .read = qcam_read, |
903 | .llseek = no_llseek, | |
904 | }; | |
905 | static struct video_device qcam_template= | |
906 | { | |
907 | .owner = THIS_MODULE, | |
908 | .name = "Connectix Quickcam", | |
909 | .type = VID_TYPE_CAPTURE, | |
1da177e4 LT |
910 | .fops = &qcam_fops, |
911 | }; | |
912 | ||
913 | #define MAX_CAMS 4 | |
914 | static struct qcam_device *qcams[MAX_CAMS]; | |
ff699e6b | 915 | static unsigned int num_cams; |
1da177e4 LT |
916 | |
917 | static int init_bwqcam(struct parport *port) | |
918 | { | |
919 | struct qcam_device *qcam; | |
920 | ||
921 | if (num_cams == MAX_CAMS) | |
922 | { | |
923 | printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS); | |
924 | return -ENOSPC; | |
925 | } | |
926 | ||
927 | qcam=qcam_init(port); | |
928 | if(qcam==NULL) | |
929 | return -ENODEV; | |
d56410e0 | 930 | |
1da177e4 LT |
931 | parport_claim_or_block(qcam->pdev); |
932 | ||
933 | qc_reset(qcam); | |
d56410e0 | 934 | |
1da177e4 LT |
935 | if(qc_detect(qcam)==0) |
936 | { | |
937 | parport_release(qcam->pdev); | |
938 | parport_unregister_device(qcam->pdev); | |
939 | kfree(qcam); | |
940 | return -ENODEV; | |
941 | } | |
942 | qc_calibrate(qcam); | |
943 | ||
944 | parport_release(qcam->pdev); | |
d56410e0 | 945 | |
1da177e4 | 946 | printk(KERN_INFO "Connectix Quickcam on %s\n", qcam->pport->name); |
d56410e0 | 947 | |
1da177e4 LT |
948 | if(video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1) |
949 | { | |
950 | parport_unregister_device(qcam->pdev); | |
951 | kfree(qcam); | |
952 | return -ENODEV; | |
953 | } | |
954 | ||
955 | qcams[num_cams++] = qcam; | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | static void close_bwqcam(struct qcam_device *qcam) | |
961 | { | |
962 | video_unregister_device(&qcam->vdev); | |
963 | parport_unregister_device(qcam->pdev); | |
964 | kfree(qcam); | |
965 | } | |
966 | ||
967 | /* The parport parameter controls which parports will be scanned. | |
968 | * Scanning all parports causes some printers to print a garbage page. | |
969 | * -- March 14, 1999 Billy Donahue <billy@escape.com> */ | |
970 | #ifdef MODULE | |
971 | static char *parport[MAX_CAMS] = { NULL, }; | |
972 | module_param_array(parport, charp, NULL, 0); | |
973 | #endif | |
974 | ||
975 | static int accept_bwqcam(struct parport *port) | |
976 | { | |
977 | #ifdef MODULE | |
978 | int n; | |
979 | ||
980 | if (parport[0] && strncmp(parport[0], "auto", 4) != 0) { | |
981 | /* user gave parport parameters */ | |
982 | for(n=0; parport[n] && n<MAX_CAMS; n++){ | |
983 | char *ep; | |
984 | unsigned long r; | |
985 | r = simple_strtoul(parport[n], &ep, 0); | |
986 | if (ep == parport[n]) { | |
987 | printk(KERN_ERR | |
988 | "bw-qcam: bad port specifier \"%s\"\n", | |
989 | parport[n]); | |
990 | continue; | |
991 | } | |
992 | if (r == port->number) | |
993 | return 1; | |
994 | } | |
995 | return 0; | |
996 | } | |
997 | #endif | |
998 | return 1; | |
999 | } | |
1000 | ||
1001 | static void bwqcam_attach(struct parport *port) | |
1002 | { | |
1003 | if (accept_bwqcam(port)) | |
1004 | init_bwqcam(port); | |
1005 | } | |
1006 | ||
1007 | static void bwqcam_detach(struct parport *port) | |
1008 | { | |
1009 | int i; | |
1010 | for (i = 0; i < num_cams; i++) { | |
1011 | struct qcam_device *qcam = qcams[i]; | |
1012 | if (qcam && qcam->pdev->port == port) { | |
1013 | qcams[i] = NULL; | |
1014 | close_bwqcam(qcam); | |
1015 | } | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | static struct parport_driver bwqcam_driver = { | |
1020 | .name = "bw-qcam", | |
1021 | .attach = bwqcam_attach, | |
1022 | .detach = bwqcam_detach, | |
1023 | }; | |
1024 | ||
1025 | static void __exit exit_bw_qcams(void) | |
1026 | { | |
1027 | parport_unregister_driver(&bwqcam_driver); | |
1028 | } | |
1029 | ||
1030 | static int __init init_bw_qcams(void) | |
1031 | { | |
1032 | #ifdef MODULE | |
1033 | /* Do some sanity checks on the module parameters. */ | |
1034 | if (maxpoll > 5000) { | |
1035 | printk("Connectix Quickcam max-poll was above 5000. Using 5000.\n"); | |
1036 | maxpoll = 5000; | |
1037 | } | |
d56410e0 | 1038 | |
1da177e4 LT |
1039 | if (yieldlines < 1) { |
1040 | printk("Connectix Quickcam yieldlines was less than 1. Using 1.\n"); | |
1041 | yieldlines = 1; | |
1042 | } | |
1043 | #endif | |
1044 | return parport_register_driver(&bwqcam_driver); | |
1045 | } | |
1046 | ||
1047 | module_init(init_bw_qcams); | |
1048 | module_exit(exit_bw_qcams); | |
1049 | ||
1050 | MODULE_LICENSE("GPL"); |