Commit | Line | Data |
---|---|---|
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> |
35ea11ff | 77 | #include <media/v4l2-ioctl.h> |
3593cab5 | 78 | #include <linux/mutex.h> |
1da177e4 LT |
79 | #include <asm/uaccess.h> |
80 | ||
81 | #include "bw-qcam.h" | |
82 | ||
83 | static unsigned int maxpoll=250; /* Maximum busy-loop count for qcam I/O */ | |
84 | static unsigned int yieldlines=4; /* Yield after this many during capture */ | |
85 | static int video_nr = -1; | |
d685a483 | 86 | static unsigned int force_init; /* Whether to probe aggressively */ |
1da177e4 LT |
87 | |
88 | module_param(maxpoll, int, 0); | |
89 | module_param(yieldlines, int, 0); | |
90 | module_param(video_nr, int, 0); | |
91 | ||
d685a483 BW |
92 | /* Set force_init=1 to avoid detection by polling status register and |
93 | * immediately attempt to initialize qcam */ | |
94 | module_param(force_init, int, 0); | |
95 | ||
1da177e4 LT |
96 | static inline int read_lpstatus(struct qcam_device *q) |
97 | { | |
98 | return parport_read_status(q->pport); | |
99 | } | |
100 | ||
101 | static inline int read_lpdata(struct qcam_device *q) | |
102 | { | |
103 | return parport_read_data(q->pport); | |
104 | } | |
105 | ||
106 | static inline void write_lpdata(struct qcam_device *q, int d) | |
107 | { | |
108 | parport_write_data(q->pport, d); | |
109 | } | |
110 | ||
111 | static inline void write_lpcontrol(struct qcam_device *q, int d) | |
112 | { | |
7c596fa9 | 113 | if (d & 0x20) { |
9e19db5b BW |
114 | /* Set bidirectional mode to reverse (data in) */ |
115 | parport_data_reverse(q->pport); | |
116 | } else { | |
117 | /* Set bidirectional mode to forward (data out) */ | |
118 | parport_data_forward(q->pport); | |
119 | } | |
120 | ||
121 | /* Now issue the regular port command, but strip out the | |
122 | * direction flag */ | |
123 | d &= ~0x20; | |
1da177e4 LT |
124 | parport_write_control(q->pport, d); |
125 | } | |
126 | ||
127 | static int qc_waithand(struct qcam_device *q, int val); | |
128 | static int qc_command(struct qcam_device *q, int command); | |
129 | static int qc_readparam(struct qcam_device *q); | |
130 | static int qc_setscanmode(struct qcam_device *q); | |
131 | static int qc_readbytes(struct qcam_device *q, char buffer[]); | |
132 | ||
133 | static struct video_device qcam_template; | |
134 | ||
135 | static int qc_calibrate(struct qcam_device *q) | |
136 | { | |
137 | /* | |
138 | * Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96 | |
139 | * The white balance is an individiual value for each | |
140 | * quickcam. | |
141 | */ | |
142 | ||
143 | int value; | |
144 | int count = 0; | |
145 | ||
146 | qc_command(q, 27); /* AutoAdjustOffset */ | |
147 | qc_command(q, 0); /* Dummy Parameter, ignored by the camera */ | |
148 | ||
149 | /* GetOffset (33) will read 255 until autocalibration */ | |
150 | /* is finished. After that, a value of 1-254 will be */ | |
151 | /* returned. */ | |
152 | ||
153 | do { | |
154 | qc_command(q, 33); | |
155 | value = qc_readparam(q); | |
156 | mdelay(1); | |
157 | schedule(); | |
158 | count++; | |
159 | } while (value == 0xff && count<2048); | |
160 | ||
161 | q->whitebal = value; | |
162 | return value; | |
163 | } | |
164 | ||
165 | /* Initialize the QuickCam driver control structure. This is where | |
166 | * defaults are set for people who don't have a config file.*/ | |
167 | ||
168 | static struct qcam_device *qcam_init(struct parport *port) | |
169 | { | |
170 | struct qcam_device *q; | |
d56410e0 | 171 | |
1da177e4 LT |
172 | q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL); |
173 | if(q==NULL) | |
174 | return NULL; | |
175 | ||
176 | q->pport = port; | |
177 | q->pdev = parport_register_device(port, "bw-qcam", NULL, NULL, | |
178 | NULL, 0, NULL); | |
d56410e0 | 179 | if (q->pdev == NULL) |
1da177e4 LT |
180 | { |
181 | printk(KERN_ERR "bw-qcam: couldn't register for %s.\n", | |
182 | port->name); | |
183 | kfree(q); | |
184 | return NULL; | |
185 | } | |
d56410e0 | 186 | |
1da177e4 | 187 | memcpy(&q->vdev, &qcam_template, sizeof(qcam_template)); |
d56410e0 | 188 | |
3593cab5 | 189 | mutex_init(&q->lock); |
1da177e4 LT |
190 | |
191 | q->port_mode = (QC_ANY | QC_NOTSET); | |
192 | q->width = 320; | |
193 | q->height = 240; | |
194 | q->bpp = 4; | |
195 | q->transfer_scale = 2; | |
196 | q->contrast = 192; | |
197 | q->brightness = 180; | |
198 | q->whitebal = 105; | |
199 | q->top = 1; | |
200 | q->left = 14; | |
201 | q->mode = -1; | |
202 | q->status = QC_PARAM_CHANGE; | |
203 | return q; | |
204 | } | |
205 | ||
206 | ||
207 | /* qc_command is probably a bit of a misnomer -- it's used to send | |
208 | * bytes *to* the camera. Generally, these bytes are either commands | |
209 | * or arguments to commands, so the name fits, but it still bugs me a | |
210 | * bit. See the documentation for a list of commands. */ | |
211 | ||
212 | static int qc_command(struct qcam_device *q, int command) | |
213 | { | |
214 | int n1, n2; | |
215 | int cmd; | |
216 | ||
217 | write_lpdata(q, command); | |
218 | write_lpcontrol(q, 6); | |
219 | ||
220 | n1 = qc_waithand(q, 1); | |
221 | ||
222 | write_lpcontrol(q, 0xe); | |
223 | n2 = qc_waithand(q, 0); | |
224 | ||
225 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
226 | return cmd; | |
227 | } | |
228 | ||
229 | static int qc_readparam(struct qcam_device *q) | |
230 | { | |
231 | int n1, n2; | |
232 | int cmd; | |
233 | ||
234 | write_lpcontrol(q, 6); | |
235 | n1 = qc_waithand(q, 1); | |
236 | ||
237 | write_lpcontrol(q, 0xe); | |
238 | n2 = qc_waithand(q, 0); | |
239 | ||
240 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
241 | return cmd; | |
242 | } | |
243 | ||
244 | /* qc_waithand busy-waits for a handshake signal from the QuickCam. | |
245 | * Almost all communication with the camera requires handshaking. */ | |
246 | ||
247 | static int qc_waithand(struct qcam_device *q, int val) | |
248 | { | |
249 | int status; | |
250 | int runs=0; | |
251 | ||
252 | if (val) | |
253 | { | |
254 | while (!((status = read_lpstatus(q)) & 8)) | |
255 | { | |
256 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 257 | cases, at that point we start to poll slowly |
1da177e4 LT |
258 | until the camera wakes up. However, we are |
259 | busy blocked until the camera responds, so | |
260 | setting it lower is much better for interactive | |
261 | response. */ | |
d56410e0 | 262 | |
1da177e4 LT |
263 | if(runs++>maxpoll) |
264 | { | |
265 | msleep_interruptible(5); | |
266 | } | |
267 | if(runs>(maxpoll+1000)) /* 5 seconds */ | |
268 | return -1; | |
269 | } | |
270 | } | |
271 | else | |
272 | { | |
273 | while (((status = read_lpstatus(q)) & 8)) | |
274 | { | |
275 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 276 | cases, at that point we start to poll slowly |
1da177e4 LT |
277 | until the camera wakes up. However, we are |
278 | busy blocked until the camera responds, so | |
279 | setting it lower is much better for interactive | |
280 | response. */ | |
d56410e0 | 281 | |
1da177e4 LT |
282 | if(runs++>maxpoll) |
283 | { | |
284 | msleep_interruptible(5); | |
285 | } | |
286 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
287 | return -1; | |
288 | } | |
289 | } | |
290 | ||
291 | return status; | |
292 | } | |
293 | ||
294 | /* Waithand2 is used when the qcam is in bidirectional mode, and the | |
295 | * handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1 | |
296 | * (bit 3 of status register). It also returns the last value read, | |
297 | * since this data is useful. */ | |
298 | ||
299 | static unsigned int qc_waithand2(struct qcam_device *q, int val) | |
300 | { | |
301 | unsigned int status; | |
302 | int runs=0; | |
d56410e0 MCC |
303 | |
304 | do | |
1da177e4 LT |
305 | { |
306 | status = read_lpdata(q); | |
307 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 308 | cases, at that point we start to poll slowly |
1da177e4 LT |
309 | until the camera wakes up. However, we are |
310 | busy blocked until the camera responds, so | |
311 | setting it lower is much better for interactive | |
312 | response. */ | |
d56410e0 | 313 | |
1da177e4 LT |
314 | if(runs++>maxpoll) |
315 | { | |
316 | msleep_interruptible(5); | |
317 | } | |
318 | if(runs++>(maxpoll+1000)) /* 5 seconds */ | |
319 | return 0; | |
320 | } | |
321 | while ((status & 1) != val); | |
322 | ||
323 | return status; | |
324 | } | |
325 | ||
326 | ||
327 | /* Try to detect a QuickCam. It appears to flash the upper 4 bits of | |
328 | the status register at 5-10 Hz. This is only used in the autoprobe | |
329 | code. Be aware that this isn't the way Connectix detects the | |
330 | camera (they send a reset and try to handshake), but this should be | |
331 | almost completely safe, while their method screws up my printer if | |
332 | I plug it in before the camera. */ | |
333 | ||
334 | static int qc_detect(struct qcam_device *q) | |
335 | { | |
336 | int reg, lastreg; | |
337 | int count = 0; | |
338 | int i; | |
339 | ||
d685a483 BW |
340 | if (force_init) |
341 | return 1; | |
342 | ||
1da177e4 LT |
343 | lastreg = reg = read_lpstatus(q) & 0xf0; |
344 | ||
d56410e0 | 345 | for (i = 0; i < 500; i++) |
1da177e4 LT |
346 | { |
347 | reg = read_lpstatus(q) & 0xf0; | |
348 | if (reg != lastreg) | |
349 | count++; | |
350 | lastreg = reg; | |
351 | mdelay(2); | |
352 | } | |
353 | ||
354 | ||
355 | #if 0 | |
356 | /* Force camera detection during testing. Sometimes the camera | |
357 | won't be flashing these bits. Possibly unloading the module | |
358 | in the middle of a grab? Or some timeout condition? | |
359 | I've seen this parameter as low as 19 on my 450Mhz box - mpc */ | |
360 | printk("Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count); | |
361 | return 1; | |
362 | #endif | |
363 | ||
364 | /* Be (even more) liberal in what you accept... */ | |
365 | ||
7c596fa9 | 366 | if (count > 20 && count < 400) { |
1da177e4 | 367 | return 1; /* found */ |
9e19db5b | 368 | } else { |
7c596fa9 BW |
369 | printk(KERN_ERR "No Quickcam found on port %s\n", |
370 | q->pport->name); | |
d685a483 | 371 | printk(KERN_DEBUG "Quickcam detection counter: %u\n", count); |
1da177e4 | 372 | return 0; /* not found */ |
9e19db5b | 373 | } |
1da177e4 LT |
374 | } |
375 | ||
376 | ||
377 | /* Reset the QuickCam. This uses the same sequence the Windows | |
378 | * QuickPic program uses. Someone with a bi-directional port should | |
379 | * check that bi-directional mode is detected right, and then | |
380 | * implement bi-directional mode in qc_readbyte(). */ | |
381 | ||
382 | static void qc_reset(struct qcam_device *q) | |
383 | { | |
d56410e0 | 384 | switch (q->port_mode & QC_FORCE_MASK) |
1da177e4 LT |
385 | { |
386 | case QC_FORCE_UNIDIR: | |
387 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
388 | break; | |
389 | ||
390 | case QC_FORCE_BIDIR: | |
391 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
392 | break; | |
393 | ||
394 | case QC_ANY: | |
395 | write_lpcontrol(q, 0x20); | |
396 | write_lpdata(q, 0x75); | |
d56410e0 | 397 | |
1da177e4 LT |
398 | if (read_lpdata(q) != 0x75) { |
399 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
400 | } else { | |
401 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
402 | } | |
403 | break; | |
404 | } | |
405 | ||
406 | write_lpcontrol(q, 0xb); | |
407 | udelay(250); | |
408 | write_lpcontrol(q, 0xe); | |
409 | qc_setscanmode(q); /* in case port_mode changed */ | |
410 | } | |
411 | ||
412 | ||
413 | /* Decide which scan mode to use. There's no real requirement that | |
414 | * the scanmode match the resolution in q->height and q-> width -- the | |
415 | * camera takes the picture at the resolution specified in the | |
416 | * "scanmode" and then returns the image at the resolution specified | |
417 | * with the resolution commands. If the scan is bigger than the | |
418 | * requested resolution, the upper-left hand corner of the scan is | |
419 | * returned. If the scan is smaller, then the rest of the image | |
420 | * returned contains garbage. */ | |
421 | ||
422 | static int qc_setscanmode(struct qcam_device *q) | |
423 | { | |
424 | int old_mode = q->mode; | |
d56410e0 MCC |
425 | |
426 | switch (q->transfer_scale) | |
1da177e4 LT |
427 | { |
428 | case 1: | |
429 | q->mode = 0; | |
430 | break; | |
431 | case 2: | |
432 | q->mode = 4; | |
433 | break; | |
434 | case 4: | |
435 | q->mode = 8; | |
436 | break; | |
437 | } | |
438 | ||
d56410e0 | 439 | switch (q->bpp) |
1da177e4 LT |
440 | { |
441 | case 4: | |
442 | break; | |
443 | case 6: | |
444 | q->mode += 2; | |
445 | break; | |
446 | } | |
447 | ||
d56410e0 | 448 | switch (q->port_mode & QC_MODE_MASK) |
1da177e4 LT |
449 | { |
450 | case QC_BIDIR: | |
451 | q->mode += 1; | |
452 | break; | |
453 | case QC_NOTSET: | |
454 | case QC_UNIDIR: | |
455 | break; | |
456 | } | |
d56410e0 | 457 | |
1da177e4 LT |
458 | if (q->mode != old_mode) |
459 | q->status |= QC_PARAM_CHANGE; | |
d56410e0 | 460 | |
1da177e4 LT |
461 | return 0; |
462 | } | |
463 | ||
464 | ||
465 | /* Reset the QuickCam and program for brightness, contrast, | |
466 | * white-balance, and resolution. */ | |
467 | ||
468 | static void qc_set(struct qcam_device *q) | |
469 | { | |
470 | int val; | |
471 | int val2; | |
472 | ||
473 | qc_reset(q); | |
474 | ||
475 | /* Set the brightness. Yes, this is repetitive, but it works. | |
476 | * Shorter versions seem to fail subtly. Feel free to try :-). */ | |
477 | /* I think the problem was in qc_command, not here -- bls */ | |
d56410e0 | 478 | |
1da177e4 LT |
479 | qc_command(q, 0xb); |
480 | qc_command(q, q->brightness); | |
481 | ||
482 | val = q->height / q->transfer_scale; | |
483 | qc_command(q, 0x11); | |
484 | qc_command(q, val); | |
485 | if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) { | |
486 | /* The normal "transfers per line" calculation doesn't seem to work | |
487 | as expected here (and yet it works fine in qc_scan). No idea | |
488 | why this case is the odd man out. Fortunately, Laird's original | |
489 | working version gives me a good way to guess at working values. | |
490 | -- bls */ | |
491 | val = q->width; | |
492 | val2 = q->transfer_scale * 4; | |
493 | } else { | |
494 | val = q->width * q->bpp; | |
495 | val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
496 | q->transfer_scale; | |
497 | } | |
e9e24cee | 498 | val = DIV_ROUND_UP(val, val2); |
1da177e4 LT |
499 | qc_command(q, 0x13); |
500 | qc_command(q, val); | |
501 | ||
502 | /* Setting top and left -- bls */ | |
503 | qc_command(q, 0xd); | |
504 | qc_command(q, q->top); | |
505 | qc_command(q, 0xf); | |
506 | qc_command(q, q->left / 2); | |
507 | ||
508 | qc_command(q, 0x19); | |
509 | qc_command(q, q->contrast); | |
510 | qc_command(q, 0x1f); | |
511 | qc_command(q, q->whitebal); | |
512 | ||
513 | /* Clear flag that we must update the grabbing parameters on the camera | |
514 | before we grab the next frame */ | |
515 | q->status &= (~QC_PARAM_CHANGE); | |
516 | } | |
517 | ||
518 | /* Qc_readbytes reads some bytes from the QC and puts them in | |
519 | the supplied buffer. It returns the number of bytes read, | |
520 | or -1 on error. */ | |
521 | ||
522 | static inline int qc_readbytes(struct qcam_device *q, char buffer[]) | |
523 | { | |
524 | int ret=1; | |
525 | unsigned int hi, lo; | |
526 | unsigned int hi2, lo2; | |
ff699e6b | 527 | static int state; |
1da177e4 | 528 | |
d56410e0 | 529 | if (buffer == NULL) |
1da177e4 LT |
530 | { |
531 | state = 0; | |
532 | return 0; | |
533 | } | |
d56410e0 MCC |
534 | |
535 | switch (q->port_mode & QC_MODE_MASK) | |
1da177e4 LT |
536 | { |
537 | case QC_BIDIR: /* Bi-directional Port */ | |
538 | write_lpcontrol(q, 0x26); | |
539 | lo = (qc_waithand2(q, 1) >> 1); | |
540 | hi = (read_lpstatus(q) >> 3) & 0x1f; | |
541 | write_lpcontrol(q, 0x2e); | |
542 | lo2 = (qc_waithand2(q, 0) >> 1); | |
543 | hi2 = (read_lpstatus(q) >> 3) & 0x1f; | |
d56410e0 | 544 | switch (q->bpp) |
1da177e4 LT |
545 | { |
546 | case 4: | |
547 | buffer[0] = lo & 0xf; | |
548 | buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3); | |
549 | buffer[2] = (hi & 0x1e) >> 1; | |
550 | buffer[3] = lo2 & 0xf; | |
551 | buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3); | |
552 | buffer[5] = (hi2 & 0x1e) >> 1; | |
553 | ret = 6; | |
554 | break; | |
555 | case 6: | |
556 | buffer[0] = lo & 0x3f; | |
557 | buffer[1] = ((lo & 0x40) >> 6) | (hi << 1); | |
558 | buffer[2] = lo2 & 0x3f; | |
559 | buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1); | |
560 | ret = 4; | |
561 | break; | |
562 | } | |
563 | break; | |
564 | ||
565 | case QC_UNIDIR: /* Unidirectional Port */ | |
566 | write_lpcontrol(q, 6); | |
567 | lo = (qc_waithand(q, 1) & 0xf0) >> 4; | |
568 | write_lpcontrol(q, 0xe); | |
569 | hi = (qc_waithand(q, 0) & 0xf0) >> 4; | |
570 | ||
d56410e0 | 571 | switch (q->bpp) |
1da177e4 LT |
572 | { |
573 | case 4: | |
574 | buffer[0] = lo; | |
575 | buffer[1] = hi; | |
576 | ret = 2; | |
577 | break; | |
578 | case 6: | |
d56410e0 | 579 | switch (state) |
1da177e4 LT |
580 | { |
581 | case 0: | |
582 | buffer[0] = (lo << 2) | ((hi & 0xc) >> 2); | |
583 | q->saved_bits = (hi & 3) << 4; | |
584 | state = 1; | |
585 | ret = 1; | |
586 | break; | |
587 | case 1: | |
588 | buffer[0] = lo | q->saved_bits; | |
589 | q->saved_bits = hi << 2; | |
590 | state = 2; | |
591 | ret = 1; | |
592 | break; | |
593 | case 2: | |
594 | buffer[0] = ((lo & 0xc) >> 2) | q->saved_bits; | |
595 | buffer[1] = ((lo & 3) << 4) | hi; | |
596 | state = 0; | |
597 | ret = 2; | |
598 | break; | |
599 | } | |
600 | break; | |
601 | } | |
602 | break; | |
603 | } | |
604 | return ret; | |
605 | } | |
606 | ||
607 | /* requests a scan from the camera. It sends the correct instructions | |
608 | * to the camera and then reads back the correct number of bytes. In | |
609 | * previous versions of this routine the return structure contained | |
610 | * the raw output from the camera, and there was a 'qc_convertscan' | |
611 | * function that converted that to a useful format. In version 0.3 I | |
612 | * rolled qc_convertscan into qc_scan and now I only return the | |
613 | * converted scan. The format is just an one-dimensional array of | |
614 | * characters, one for each pixel, with 0=black up to n=white, where | |
615 | * n=2^(bit depth)-1. Ask me for more details if you don't understand | |
616 | * this. */ | |
617 | ||
618 | static long qc_capture(struct qcam_device * q, char __user *buf, unsigned long len) | |
619 | { | |
620 | int i, j, k, yield; | |
621 | int bytes; | |
622 | int linestotrans, transperline; | |
623 | int divisor; | |
624 | int pixels_per_line; | |
625 | int pixels_read = 0; | |
626 | int got=0; | |
627 | char buffer[6]; | |
628 | int shift=8-q->bpp; | |
629 | char invert; | |
630 | ||
d56410e0 | 631 | if (q->mode == -1) |
1da177e4 LT |
632 | return -ENXIO; |
633 | ||
634 | qc_command(q, 0x7); | |
635 | qc_command(q, q->mode); | |
636 | ||
d56410e0 | 637 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
638 | { |
639 | write_lpcontrol(q, 0x2e); /* turn port around */ | |
640 | write_lpcontrol(q, 0x26); | |
641 | (void) qc_waithand(q, 1); | |
642 | write_lpcontrol(q, 0x2e); | |
643 | (void) qc_waithand(q, 0); | |
644 | } | |
d56410e0 | 645 | |
1da177e4 LT |
646 | /* strange -- should be 15:63 below, but 4bpp is odd */ |
647 | invert = (q->bpp == 4) ? 16 : 63; | |
648 | ||
649 | linestotrans = q->height / q->transfer_scale; | |
650 | pixels_per_line = q->width / q->transfer_scale; | |
651 | transperline = q->width * q->bpp; | |
652 | divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
653 | q->transfer_scale; | |
e9e24cee | 654 | transperline = DIV_ROUND_UP(transperline, divisor); |
1da177e4 | 655 | |
d56410e0 | 656 | for (i = 0, yield = yieldlines; i < linestotrans; i++) |
1da177e4 | 657 | { |
d56410e0 | 658 | for (pixels_read = j = 0; j < transperline; j++) |
1da177e4 LT |
659 | { |
660 | bytes = qc_readbytes(q, buffer); | |
d56410e0 | 661 | for (k = 0; k < bytes && (pixels_read + k) < pixels_per_line; k++) |
1da177e4 LT |
662 | { |
663 | int o; | |
d56410e0 | 664 | if (buffer[k] == 0 && invert == 16) |
1da177e4 LT |
665 | { |
666 | /* 4bpp is odd (again) -- inverter is 16, not 15, but output | |
667 | must be 0-15 -- bls */ | |
668 | buffer[k] = 16; | |
669 | } | |
670 | o=i*pixels_per_line + pixels_read + k; | |
671 | if(o<len) | |
672 | { | |
673 | got++; | |
674 | put_user((invert - buffer[k])<<shift, buf+o); | |
675 | } | |
676 | } | |
677 | pixels_read += bytes; | |
678 | } | |
679 | (void) qc_readbytes(q, NULL); /* reset state machine */ | |
d56410e0 | 680 | |
1da177e4 LT |
681 | /* Grabbing an entire frame from the quickcam is a lengthy |
682 | process. We don't (usually) want to busy-block the | |
683 | processor for the entire frame. yieldlines is a module | |
684 | parameter. If we yield every line, the minimum frame | |
685 | time will be 240 / 200 = 1.2 seconds. The compile-time | |
686 | default is to yield every 4 lines. */ | |
687 | if (i >= yield) { | |
688 | msleep_interruptible(5); | |
689 | yield = i + yieldlines; | |
690 | } | |
691 | } | |
692 | ||
d56410e0 | 693 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) |
1da177e4 LT |
694 | { |
695 | write_lpcontrol(q, 2); | |
696 | write_lpcontrol(q, 6); | |
697 | udelay(3); | |
698 | write_lpcontrol(q, 0xe); | |
699 | } | |
700 | if(got<len) | |
701 | return got; | |
702 | return len; | |
703 | } | |
704 | ||
705 | /* | |
706 | * Video4linux interfacing | |
707 | */ | |
708 | ||
069b7479 | 709 | static long qcam_do_ioctl(struct file *file, unsigned int cmd, void *arg) |
1da177e4 LT |
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 | ||
069b7479 | 866 | static long qcam_ioctl(struct file *file, |
1da177e4 LT |
867 | unsigned int cmd, unsigned long arg) |
868 | { | |
f473bf76 | 869 | return video_usercopy(file, cmd, arg, qcam_do_ioctl); |
1da177e4 LT |
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 | |
bec43661 | 896 | static int qcam_exclusive_open(struct file *file) |
7d43cd53 HV |
897 | { |
898 | struct video_device *dev = video_devdata(file); | |
899 | struct qcam_device *qcam = (struct qcam_device *)dev; | |
900 | ||
901 | return test_and_set_bit(0, &qcam->in_use) ? -EBUSY : 0; | |
902 | } | |
903 | ||
bec43661 | 904 | static int qcam_exclusive_release(struct file *file) |
7d43cd53 HV |
905 | { |
906 | struct video_device *dev = video_devdata(file); | |
907 | struct qcam_device *qcam = (struct qcam_device *)dev; | |
908 | ||
909 | clear_bit(0, &qcam->in_use); | |
910 | return 0; | |
911 | } | |
912 | ||
bec43661 | 913 | static const struct v4l2_file_operations qcam_fops = { |
1da177e4 | 914 | .owner = THIS_MODULE, |
7d43cd53 HV |
915 | .open = qcam_exclusive_open, |
916 | .release = qcam_exclusive_release, | |
1da177e4 LT |
917 | .ioctl = qcam_ioctl, |
918 | .read = qcam_read, | |
1da177e4 LT |
919 | }; |
920 | static struct video_device qcam_template= | |
921 | { | |
1da177e4 | 922 | .name = "Connectix Quickcam", |
1da177e4 | 923 | .fops = &qcam_fops, |
aa5e90af | 924 | .release = video_device_release_empty, |
1da177e4 LT |
925 | }; |
926 | ||
927 | #define MAX_CAMS 4 | |
928 | static struct qcam_device *qcams[MAX_CAMS]; | |
ff699e6b | 929 | static unsigned int num_cams; |
1da177e4 LT |
930 | |
931 | static int init_bwqcam(struct parport *port) | |
932 | { | |
933 | struct qcam_device *qcam; | |
934 | ||
935 | if (num_cams == MAX_CAMS) | |
936 | { | |
937 | printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS); | |
938 | return -ENOSPC; | |
939 | } | |
940 | ||
941 | qcam=qcam_init(port); | |
942 | if(qcam==NULL) | |
943 | return -ENODEV; | |
d56410e0 | 944 | |
1da177e4 LT |
945 | parport_claim_or_block(qcam->pdev); |
946 | ||
947 | qc_reset(qcam); | |
d56410e0 | 948 | |
1da177e4 LT |
949 | if(qc_detect(qcam)==0) |
950 | { | |
951 | parport_release(qcam->pdev); | |
952 | parport_unregister_device(qcam->pdev); | |
953 | kfree(qcam); | |
954 | return -ENODEV; | |
955 | } | |
956 | qc_calibrate(qcam); | |
957 | ||
958 | parport_release(qcam->pdev); | |
d56410e0 | 959 | |
1da177e4 | 960 | printk(KERN_INFO "Connectix Quickcam on %s\n", qcam->pport->name); |
d56410e0 | 961 | |
dc60de33 | 962 | if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) { |
1da177e4 LT |
963 | parport_unregister_device(qcam->pdev); |
964 | kfree(qcam); | |
965 | return -ENODEV; | |
966 | } | |
967 | ||
968 | qcams[num_cams++] = qcam; | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
973 | static void close_bwqcam(struct qcam_device *qcam) | |
974 | { | |
975 | video_unregister_device(&qcam->vdev); | |
976 | parport_unregister_device(qcam->pdev); | |
977 | kfree(qcam); | |
978 | } | |
979 | ||
980 | /* The parport parameter controls which parports will be scanned. | |
981 | * Scanning all parports causes some printers to print a garbage page. | |
982 | * -- March 14, 1999 Billy Donahue <billy@escape.com> */ | |
983 | #ifdef MODULE | |
984 | static char *parport[MAX_CAMS] = { NULL, }; | |
985 | module_param_array(parport, charp, NULL, 0); | |
986 | #endif | |
987 | ||
988 | static int accept_bwqcam(struct parport *port) | |
989 | { | |
990 | #ifdef MODULE | |
991 | int n; | |
992 | ||
993 | if (parport[0] && strncmp(parport[0], "auto", 4) != 0) { | |
994 | /* user gave parport parameters */ | |
995 | for(n=0; parport[n] && n<MAX_CAMS; n++){ | |
996 | char *ep; | |
997 | unsigned long r; | |
998 | r = simple_strtoul(parport[n], &ep, 0); | |
999 | if (ep == parport[n]) { | |
1000 | printk(KERN_ERR | |
1001 | "bw-qcam: bad port specifier \"%s\"\n", | |
1002 | parport[n]); | |
1003 | continue; | |
1004 | } | |
1005 | if (r == port->number) | |
1006 | return 1; | |
1007 | } | |
1008 | return 0; | |
1009 | } | |
1010 | #endif | |
1011 | return 1; | |
1012 | } | |
1013 | ||
1014 | static void bwqcam_attach(struct parport *port) | |
1015 | { | |
1016 | if (accept_bwqcam(port)) | |
1017 | init_bwqcam(port); | |
1018 | } | |
1019 | ||
1020 | static void bwqcam_detach(struct parport *port) | |
1021 | { | |
1022 | int i; | |
1023 | for (i = 0; i < num_cams; i++) { | |
1024 | struct qcam_device *qcam = qcams[i]; | |
1025 | if (qcam && qcam->pdev->port == port) { | |
1026 | qcams[i] = NULL; | |
1027 | close_bwqcam(qcam); | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static struct parport_driver bwqcam_driver = { | |
1033 | .name = "bw-qcam", | |
1034 | .attach = bwqcam_attach, | |
1035 | .detach = bwqcam_detach, | |
1036 | }; | |
1037 | ||
1038 | static void __exit exit_bw_qcams(void) | |
1039 | { | |
1040 | parport_unregister_driver(&bwqcam_driver); | |
1041 | } | |
1042 | ||
1043 | static int __init init_bw_qcams(void) | |
1044 | { | |
1045 | #ifdef MODULE | |
1046 | /* Do some sanity checks on the module parameters. */ | |
1047 | if (maxpoll > 5000) { | |
1048 | printk("Connectix Quickcam max-poll was above 5000. Using 5000.\n"); | |
1049 | maxpoll = 5000; | |
1050 | } | |
d56410e0 | 1051 | |
1da177e4 LT |
1052 | if (yieldlines < 1) { |
1053 | printk("Connectix Quickcam yieldlines was less than 1. Using 1.\n"); | |
1054 | yieldlines = 1; | |
1055 | } | |
1056 | #endif | |
1057 | return parport_register_driver(&bwqcam_driver); | |
1058 | } | |
1059 | ||
1060 | module_init(init_bw_qcams); | |
1061 | module_exit(exit_bw_qcams); | |
1062 | ||
1063 | MODULE_LICENSE("GPL"); |