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> | |
1da177e4 LT |
69 | #include <linux/kernel.h> |
70 | #include <linux/slab.h> | |
71 | #include <linux/mm.h> | |
72 | #include <linux/parport.h> | |
73 | #include <linux/sched.h> | |
483d67ff HV |
74 | #include <linux/version.h> |
75 | #include <linux/videodev2.h> | |
3593cab5 | 76 | #include <linux/mutex.h> |
1da177e4 | 77 | #include <asm/uaccess.h> |
483d67ff HV |
78 | #include <media/v4l2-common.h> |
79 | #include <media/v4l2-ioctl.h> | |
80 | #include <media/v4l2-device.h> | |
81 | ||
82 | /* One from column A... */ | |
83 | #define QC_NOTSET 0 | |
84 | #define QC_UNIDIR 1 | |
85 | #define QC_BIDIR 2 | |
86 | #define QC_SERIAL 3 | |
87 | ||
88 | /* ... and one from column B */ | |
89 | #define QC_ANY 0x00 | |
90 | #define QC_FORCE_UNIDIR 0x10 | |
91 | #define QC_FORCE_BIDIR 0x20 | |
92 | #define QC_FORCE_SERIAL 0x30 | |
93 | /* in the port_mode member */ | |
94 | ||
95 | #define QC_MODE_MASK 0x07 | |
96 | #define QC_FORCE_MASK 0x70 | |
97 | ||
98 | #define MAX_HEIGHT 243 | |
99 | #define MAX_WIDTH 336 | |
100 | ||
101 | /* Bit fields for status flags */ | |
102 | #define QC_PARAM_CHANGE 0x01 /* Camera status change has occurred */ | |
103 | ||
104 | struct qcam { | |
105 | struct v4l2_device v4l2_dev; | |
106 | struct video_device vdev; | |
107 | struct pardevice *pdev; | |
108 | struct parport *pport; | |
109 | struct mutex lock; | |
110 | int width, height; | |
111 | int bpp; | |
112 | int mode; | |
113 | int contrast, brightness, whitebal; | |
114 | int port_mode; | |
115 | int transfer_scale; | |
116 | int top, left; | |
117 | int status; | |
118 | unsigned int saved_bits; | |
119 | unsigned long in_use; | |
120 | }; | |
1da177e4 | 121 | |
1d61aac0 HV |
122 | static unsigned int maxpoll = 250; /* Maximum busy-loop count for qcam I/O */ |
123 | static unsigned int yieldlines = 4; /* Yield after this many during capture */ | |
1da177e4 | 124 | static int video_nr = -1; |
d685a483 | 125 | static unsigned int force_init; /* Whether to probe aggressively */ |
1da177e4 LT |
126 | |
127 | module_param(maxpoll, int, 0); | |
128 | module_param(yieldlines, int, 0); | |
129 | module_param(video_nr, int, 0); | |
130 | ||
d685a483 BW |
131 | /* Set force_init=1 to avoid detection by polling status register and |
132 | * immediately attempt to initialize qcam */ | |
133 | module_param(force_init, int, 0); | |
134 | ||
483d67ff HV |
135 | #define MAX_CAMS 4 |
136 | static struct qcam *qcams[MAX_CAMS]; | |
137 | static unsigned int num_cams; | |
138 | ||
139 | static inline int read_lpstatus(struct qcam *q) | |
1da177e4 LT |
140 | { |
141 | return parport_read_status(q->pport); | |
142 | } | |
143 | ||
483d67ff | 144 | static inline int read_lpdata(struct qcam *q) |
1da177e4 LT |
145 | { |
146 | return parport_read_data(q->pport); | |
147 | } | |
148 | ||
483d67ff | 149 | static inline void write_lpdata(struct qcam *q, int d) |
1da177e4 LT |
150 | { |
151 | parport_write_data(q->pport, d); | |
152 | } | |
153 | ||
483d67ff | 154 | static void write_lpcontrol(struct qcam *q, int d) |
1da177e4 | 155 | { |
7c596fa9 | 156 | if (d & 0x20) { |
9e19db5b BW |
157 | /* Set bidirectional mode to reverse (data in) */ |
158 | parport_data_reverse(q->pport); | |
159 | } else { | |
160 | /* Set bidirectional mode to forward (data out) */ | |
161 | parport_data_forward(q->pport); | |
162 | } | |
163 | ||
164 | /* Now issue the regular port command, but strip out the | |
165 | * direction flag */ | |
166 | d &= ~0x20; | |
1da177e4 LT |
167 | parport_write_control(q->pport, d); |
168 | } | |
169 | ||
1da177e4 LT |
170 | |
171 | /* qc_waithand busy-waits for a handshake signal from the QuickCam. | |
172 | * Almost all communication with the camera requires handshaking. */ | |
173 | ||
483d67ff | 174 | static int qc_waithand(struct qcam *q, int val) |
1da177e4 LT |
175 | { |
176 | int status; | |
1d61aac0 | 177 | int runs = 0; |
1da177e4 | 178 | |
1d61aac0 HV |
179 | if (val) { |
180 | while (!((status = read_lpstatus(q)) & 8)) { | |
1da177e4 | 181 | /* 1000 is enough spins on the I/O for all normal |
d56410e0 | 182 | cases, at that point we start to poll slowly |
1da177e4 LT |
183 | until the camera wakes up. However, we are |
184 | busy blocked until the camera responds, so | |
185 | setting it lower is much better for interactive | |
186 | response. */ | |
d56410e0 | 187 | |
1d61aac0 | 188 | if (runs++ > maxpoll) |
1da177e4 | 189 | msleep_interruptible(5); |
1d61aac0 | 190 | if (runs > (maxpoll + 1000)) /* 5 seconds */ |
1da177e4 LT |
191 | return -1; |
192 | } | |
1d61aac0 HV |
193 | } else { |
194 | while (((status = read_lpstatus(q)) & 8)) { | |
1da177e4 | 195 | /* 1000 is enough spins on the I/O for all normal |
d56410e0 | 196 | cases, at that point we start to poll slowly |
1da177e4 LT |
197 | until the camera wakes up. However, we are |
198 | busy blocked until the camera responds, so | |
199 | setting it lower is much better for interactive | |
200 | response. */ | |
d56410e0 | 201 | |
1d61aac0 | 202 | if (runs++ > maxpoll) |
1da177e4 | 203 | msleep_interruptible(5); |
1d61aac0 | 204 | if (runs++ > (maxpoll + 1000)) /* 5 seconds */ |
1da177e4 LT |
205 | return -1; |
206 | } | |
207 | } | |
208 | ||
209 | return status; | |
210 | } | |
211 | ||
212 | /* Waithand2 is used when the qcam is in bidirectional mode, and the | |
213 | * handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1 | |
214 | * (bit 3 of status register). It also returns the last value read, | |
215 | * since this data is useful. */ | |
216 | ||
483d67ff | 217 | static unsigned int qc_waithand2(struct qcam *q, int val) |
1da177e4 LT |
218 | { |
219 | unsigned int status; | |
1d61aac0 | 220 | int runs = 0; |
d56410e0 | 221 | |
1d61aac0 | 222 | do { |
1da177e4 LT |
223 | status = read_lpdata(q); |
224 | /* 1000 is enough spins on the I/O for all normal | |
d56410e0 | 225 | cases, at that point we start to poll slowly |
1da177e4 LT |
226 | until the camera wakes up. However, we are |
227 | busy blocked until the camera responds, so | |
228 | setting it lower is much better for interactive | |
229 | response. */ | |
d56410e0 | 230 | |
1d61aac0 | 231 | if (runs++ > maxpoll) |
1da177e4 | 232 | msleep_interruptible(5); |
1d61aac0 | 233 | if (runs++ > (maxpoll + 1000)) /* 5 seconds */ |
1da177e4 | 234 | return 0; |
1d61aac0 | 235 | } while ((status & 1) != val); |
1da177e4 LT |
236 | |
237 | return status; | |
238 | } | |
239 | ||
483d67ff HV |
240 | /* qc_command is probably a bit of a misnomer -- it's used to send |
241 | * bytes *to* the camera. Generally, these bytes are either commands | |
242 | * or arguments to commands, so the name fits, but it still bugs me a | |
243 | * bit. See the documentation for a list of commands. */ | |
244 | ||
245 | static int qc_command(struct qcam *q, int command) | |
246 | { | |
247 | int n1, n2; | |
248 | int cmd; | |
249 | ||
250 | write_lpdata(q, command); | |
251 | write_lpcontrol(q, 6); | |
252 | ||
253 | n1 = qc_waithand(q, 1); | |
254 | ||
255 | write_lpcontrol(q, 0xe); | |
256 | n2 = qc_waithand(q, 0); | |
257 | ||
258 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
259 | return cmd; | |
260 | } | |
261 | ||
262 | static int qc_readparam(struct qcam *q) | |
263 | { | |
264 | int n1, n2; | |
265 | int cmd; | |
266 | ||
267 | write_lpcontrol(q, 6); | |
268 | n1 = qc_waithand(q, 1); | |
269 | ||
270 | write_lpcontrol(q, 0xe); | |
271 | n2 = qc_waithand(q, 0); | |
272 | ||
273 | cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); | |
274 | return cmd; | |
275 | } | |
276 | ||
1da177e4 LT |
277 | |
278 | /* Try to detect a QuickCam. It appears to flash the upper 4 bits of | |
279 | the status register at 5-10 Hz. This is only used in the autoprobe | |
280 | code. Be aware that this isn't the way Connectix detects the | |
281 | camera (they send a reset and try to handshake), but this should be | |
282 | almost completely safe, while their method screws up my printer if | |
283 | I plug it in before the camera. */ | |
284 | ||
483d67ff | 285 | static int qc_detect(struct qcam *q) |
1da177e4 LT |
286 | { |
287 | int reg, lastreg; | |
288 | int count = 0; | |
289 | int i; | |
290 | ||
d685a483 BW |
291 | if (force_init) |
292 | return 1; | |
293 | ||
1da177e4 LT |
294 | lastreg = reg = read_lpstatus(q) & 0xf0; |
295 | ||
1d61aac0 | 296 | for (i = 0; i < 500; i++) { |
1da177e4 LT |
297 | reg = read_lpstatus(q) & 0xf0; |
298 | if (reg != lastreg) | |
299 | count++; | |
300 | lastreg = reg; | |
301 | mdelay(2); | |
302 | } | |
303 | ||
304 | ||
305 | #if 0 | |
306 | /* Force camera detection during testing. Sometimes the camera | |
307 | won't be flashing these bits. Possibly unloading the module | |
308 | in the middle of a grab? Or some timeout condition? | |
309 | I've seen this parameter as low as 19 on my 450Mhz box - mpc */ | |
1d61aac0 | 310 | printk(KERN_DEBUG "Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count); |
1da177e4 LT |
311 | return 1; |
312 | #endif | |
313 | ||
314 | /* Be (even more) liberal in what you accept... */ | |
315 | ||
7c596fa9 | 316 | if (count > 20 && count < 400) { |
1da177e4 | 317 | return 1; /* found */ |
9e19db5b | 318 | } else { |
7c596fa9 | 319 | printk(KERN_ERR "No Quickcam found on port %s\n", |
1d61aac0 | 320 | q->pport->name); |
d685a483 | 321 | printk(KERN_DEBUG "Quickcam detection counter: %u\n", count); |
1da177e4 | 322 | return 0; /* not found */ |
9e19db5b | 323 | } |
1da177e4 LT |
324 | } |
325 | ||
1da177e4 LT |
326 | /* Decide which scan mode to use. There's no real requirement that |
327 | * the scanmode match the resolution in q->height and q-> width -- the | |
328 | * camera takes the picture at the resolution specified in the | |
329 | * "scanmode" and then returns the image at the resolution specified | |
330 | * with the resolution commands. If the scan is bigger than the | |
331 | * requested resolution, the upper-left hand corner of the scan is | |
332 | * returned. If the scan is smaller, then the rest of the image | |
333 | * returned contains garbage. */ | |
334 | ||
483d67ff | 335 | static int qc_setscanmode(struct qcam *q) |
1da177e4 LT |
336 | { |
337 | int old_mode = q->mode; | |
d56410e0 | 338 | |
1d61aac0 HV |
339 | switch (q->transfer_scale) { |
340 | case 1: | |
341 | q->mode = 0; | |
342 | break; | |
343 | case 2: | |
344 | q->mode = 4; | |
345 | break; | |
346 | case 4: | |
347 | q->mode = 8; | |
348 | break; | |
1da177e4 LT |
349 | } |
350 | ||
1d61aac0 HV |
351 | switch (q->bpp) { |
352 | case 4: | |
353 | break; | |
354 | case 6: | |
355 | q->mode += 2; | |
356 | break; | |
1da177e4 LT |
357 | } |
358 | ||
1d61aac0 HV |
359 | switch (q->port_mode & QC_MODE_MASK) { |
360 | case QC_BIDIR: | |
361 | q->mode += 1; | |
362 | break; | |
363 | case QC_NOTSET: | |
364 | case QC_UNIDIR: | |
365 | break; | |
1da177e4 | 366 | } |
d56410e0 | 367 | |
1da177e4 LT |
368 | if (q->mode != old_mode) |
369 | q->status |= QC_PARAM_CHANGE; | |
d56410e0 | 370 | |
1da177e4 LT |
371 | return 0; |
372 | } | |
373 | ||
374 | ||
483d67ff HV |
375 | /* Reset the QuickCam. This uses the same sequence the Windows |
376 | * QuickPic program uses. Someone with a bi-directional port should | |
377 | * check that bi-directional mode is detected right, and then | |
378 | * implement bi-directional mode in qc_readbyte(). */ | |
379 | ||
380 | static void qc_reset(struct qcam *q) | |
381 | { | |
382 | switch (q->port_mode & QC_FORCE_MASK) { | |
383 | case QC_FORCE_UNIDIR: | |
384 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
385 | break; | |
386 | ||
387 | case QC_FORCE_BIDIR: | |
388 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
389 | break; | |
390 | ||
391 | case QC_ANY: | |
392 | write_lpcontrol(q, 0x20); | |
393 | write_lpdata(q, 0x75); | |
394 | ||
395 | if (read_lpdata(q) != 0x75) | |
396 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; | |
397 | else | |
398 | q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; | |
399 | break; | |
400 | } | |
401 | ||
402 | write_lpcontrol(q, 0xb); | |
403 | udelay(250); | |
404 | write_lpcontrol(q, 0xe); | |
405 | qc_setscanmode(q); /* in case port_mode changed */ | |
406 | } | |
407 | ||
408 | ||
409 | ||
1da177e4 LT |
410 | /* Reset the QuickCam and program for brightness, contrast, |
411 | * white-balance, and resolution. */ | |
412 | ||
483d67ff | 413 | static void qc_set(struct qcam *q) |
1da177e4 LT |
414 | { |
415 | int val; | |
416 | int val2; | |
417 | ||
418 | qc_reset(q); | |
419 | ||
420 | /* Set the brightness. Yes, this is repetitive, but it works. | |
421 | * Shorter versions seem to fail subtly. Feel free to try :-). */ | |
422 | /* I think the problem was in qc_command, not here -- bls */ | |
d56410e0 | 423 | |
1da177e4 LT |
424 | qc_command(q, 0xb); |
425 | qc_command(q, q->brightness); | |
426 | ||
427 | val = q->height / q->transfer_scale; | |
428 | qc_command(q, 0x11); | |
429 | qc_command(q, val); | |
430 | if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) { | |
431 | /* The normal "transfers per line" calculation doesn't seem to work | |
432 | as expected here (and yet it works fine in qc_scan). No idea | |
433 | why this case is the odd man out. Fortunately, Laird's original | |
434 | working version gives me a good way to guess at working values. | |
435 | -- bls */ | |
436 | val = q->width; | |
437 | val2 = q->transfer_scale * 4; | |
438 | } else { | |
439 | val = q->width * q->bpp; | |
440 | val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
1d61aac0 | 441 | q->transfer_scale; |
1da177e4 | 442 | } |
e9e24cee | 443 | val = DIV_ROUND_UP(val, val2); |
1da177e4 LT |
444 | qc_command(q, 0x13); |
445 | qc_command(q, val); | |
446 | ||
447 | /* Setting top and left -- bls */ | |
448 | qc_command(q, 0xd); | |
449 | qc_command(q, q->top); | |
450 | qc_command(q, 0xf); | |
451 | qc_command(q, q->left / 2); | |
452 | ||
453 | qc_command(q, 0x19); | |
454 | qc_command(q, q->contrast); | |
455 | qc_command(q, 0x1f); | |
456 | qc_command(q, q->whitebal); | |
457 | ||
458 | /* Clear flag that we must update the grabbing parameters on the camera | |
459 | before we grab the next frame */ | |
460 | q->status &= (~QC_PARAM_CHANGE); | |
461 | } | |
462 | ||
463 | /* Qc_readbytes reads some bytes from the QC and puts them in | |
464 | the supplied buffer. It returns the number of bytes read, | |
465 | or -1 on error. */ | |
466 | ||
483d67ff | 467 | static inline int qc_readbytes(struct qcam *q, char buffer[]) |
1da177e4 | 468 | { |
1d61aac0 | 469 | int ret = 1; |
1da177e4 LT |
470 | unsigned int hi, lo; |
471 | unsigned int hi2, lo2; | |
ff699e6b | 472 | static int state; |
1da177e4 | 473 | |
1d61aac0 | 474 | if (buffer == NULL) { |
1da177e4 LT |
475 | state = 0; |
476 | return 0; | |
477 | } | |
d56410e0 | 478 | |
1d61aac0 HV |
479 | switch (q->port_mode & QC_MODE_MASK) { |
480 | case QC_BIDIR: /* Bi-directional Port */ | |
481 | write_lpcontrol(q, 0x26); | |
482 | lo = (qc_waithand2(q, 1) >> 1); | |
483 | hi = (read_lpstatus(q) >> 3) & 0x1f; | |
484 | write_lpcontrol(q, 0x2e); | |
485 | lo2 = (qc_waithand2(q, 0) >> 1); | |
486 | hi2 = (read_lpstatus(q) >> 3) & 0x1f; | |
487 | switch (q->bpp) { | |
488 | case 4: | |
489 | buffer[0] = lo & 0xf; | |
490 | buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3); | |
491 | buffer[2] = (hi & 0x1e) >> 1; | |
492 | buffer[3] = lo2 & 0xf; | |
493 | buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3); | |
494 | buffer[5] = (hi2 & 0x1e) >> 1; | |
495 | ret = 6; | |
496 | break; | |
497 | case 6: | |
498 | buffer[0] = lo & 0x3f; | |
499 | buffer[1] = ((lo & 0x40) >> 6) | (hi << 1); | |
500 | buffer[2] = lo2 & 0x3f; | |
501 | buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1); | |
502 | ret = 4; | |
1da177e4 | 503 | break; |
1d61aac0 HV |
504 | } |
505 | break; | |
506 | ||
507 | case QC_UNIDIR: /* Unidirectional Port */ | |
508 | write_lpcontrol(q, 6); | |
509 | lo = (qc_waithand(q, 1) & 0xf0) >> 4; | |
510 | write_lpcontrol(q, 0xe); | |
511 | hi = (qc_waithand(q, 0) & 0xf0) >> 4; | |
1da177e4 | 512 | |
1d61aac0 HV |
513 | switch (q->bpp) { |
514 | case 4: | |
515 | buffer[0] = lo; | |
516 | buffer[1] = hi; | |
517 | ret = 2; | |
518 | break; | |
519 | case 6: | |
520 | switch (state) { | |
521 | case 0: | |
522 | buffer[0] = (lo << 2) | ((hi & 0xc) >> 2); | |
523 | q->saved_bits = (hi & 3) << 4; | |
524 | state = 1; | |
525 | ret = 1; | |
526 | break; | |
527 | case 1: | |
528 | buffer[0] = lo | q->saved_bits; | |
529 | q->saved_bits = hi << 2; | |
530 | state = 2; | |
531 | ret = 1; | |
532 | break; | |
533 | case 2: | |
534 | buffer[0] = ((lo & 0xc) >> 2) | q->saved_bits; | |
535 | buffer[1] = ((lo & 3) << 4) | hi; | |
536 | state = 0; | |
537 | ret = 2; | |
538 | break; | |
1da177e4 LT |
539 | } |
540 | break; | |
1d61aac0 HV |
541 | } |
542 | break; | |
1da177e4 LT |
543 | } |
544 | return ret; | |
545 | } | |
546 | ||
547 | /* requests a scan from the camera. It sends the correct instructions | |
548 | * to the camera and then reads back the correct number of bytes. In | |
549 | * previous versions of this routine the return structure contained | |
550 | * the raw output from the camera, and there was a 'qc_convertscan' | |
551 | * function that converted that to a useful format. In version 0.3 I | |
552 | * rolled qc_convertscan into qc_scan and now I only return the | |
553 | * converted scan. The format is just an one-dimensional array of | |
554 | * characters, one for each pixel, with 0=black up to n=white, where | |
555 | * n=2^(bit depth)-1. Ask me for more details if you don't understand | |
556 | * this. */ | |
557 | ||
483d67ff | 558 | static long qc_capture(struct qcam *q, char __user *buf, unsigned long len) |
1da177e4 LT |
559 | { |
560 | int i, j, k, yield; | |
561 | int bytes; | |
562 | int linestotrans, transperline; | |
563 | int divisor; | |
564 | int pixels_per_line; | |
565 | int pixels_read = 0; | |
1d61aac0 | 566 | int got = 0; |
1da177e4 | 567 | char buffer[6]; |
1d61aac0 | 568 | int shift = 8 - q->bpp; |
1da177e4 LT |
569 | char invert; |
570 | ||
d56410e0 | 571 | if (q->mode == -1) |
1da177e4 LT |
572 | return -ENXIO; |
573 | ||
574 | qc_command(q, 0x7); | |
575 | qc_command(q, q->mode); | |
576 | ||
1d61aac0 | 577 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) { |
1da177e4 LT |
578 | write_lpcontrol(q, 0x2e); /* turn port around */ |
579 | write_lpcontrol(q, 0x26); | |
1d61aac0 | 580 | qc_waithand(q, 1); |
1da177e4 | 581 | write_lpcontrol(q, 0x2e); |
1d61aac0 | 582 | qc_waithand(q, 0); |
1da177e4 | 583 | } |
d56410e0 | 584 | |
1da177e4 LT |
585 | /* strange -- should be 15:63 below, but 4bpp is odd */ |
586 | invert = (q->bpp == 4) ? 16 : 63; | |
587 | ||
588 | linestotrans = q->height / q->transfer_scale; | |
589 | pixels_per_line = q->width / q->transfer_scale; | |
590 | transperline = q->width * q->bpp; | |
591 | divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * | |
1d61aac0 | 592 | q->transfer_scale; |
e9e24cee | 593 | transperline = DIV_ROUND_UP(transperline, divisor); |
1da177e4 | 594 | |
1d61aac0 HV |
595 | for (i = 0, yield = yieldlines; i < linestotrans; i++) { |
596 | for (pixels_read = j = 0; j < transperline; j++) { | |
1da177e4 | 597 | bytes = qc_readbytes(q, buffer); |
1d61aac0 | 598 | for (k = 0; k < bytes && (pixels_read + k) < pixels_per_line; k++) { |
1da177e4 | 599 | int o; |
1d61aac0 | 600 | if (buffer[k] == 0 && invert == 16) { |
1da177e4 LT |
601 | /* 4bpp is odd (again) -- inverter is 16, not 15, but output |
602 | must be 0-15 -- bls */ | |
603 | buffer[k] = 16; | |
604 | } | |
1d61aac0 HV |
605 | o = i * pixels_per_line + pixels_read + k; |
606 | if (o < len) { | |
1da177e4 | 607 | got++; |
1d61aac0 | 608 | put_user((invert - buffer[k]) << shift, buf + o); |
1da177e4 LT |
609 | } |
610 | } | |
611 | pixels_read += bytes; | |
612 | } | |
1d61aac0 | 613 | qc_readbytes(q, NULL); /* reset state machine */ |
d56410e0 | 614 | |
1da177e4 LT |
615 | /* Grabbing an entire frame from the quickcam is a lengthy |
616 | process. We don't (usually) want to busy-block the | |
617 | processor for the entire frame. yieldlines is a module | |
618 | parameter. If we yield every line, the minimum frame | |
619 | time will be 240 / 200 = 1.2 seconds. The compile-time | |
620 | default is to yield every 4 lines. */ | |
621 | if (i >= yield) { | |
622 | msleep_interruptible(5); | |
623 | yield = i + yieldlines; | |
624 | } | |
625 | } | |
626 | ||
1d61aac0 | 627 | if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) { |
1da177e4 LT |
628 | write_lpcontrol(q, 2); |
629 | write_lpcontrol(q, 6); | |
630 | udelay(3); | |
631 | write_lpcontrol(q, 0xe); | |
632 | } | |
1d61aac0 | 633 | if (got < len) |
1da177e4 LT |
634 | return got; |
635 | return len; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Video4linux interfacing | |
640 | */ | |
641 | ||
483d67ff HV |
642 | static int qcam_querycap(struct file *file, void *priv, |
643 | struct v4l2_capability *vcap) | |
1da177e4 | 644 | { |
483d67ff | 645 | struct qcam *qcam = video_drvdata(file); |
1da177e4 | 646 | |
483d67ff HV |
647 | strlcpy(vcap->driver, qcam->v4l2_dev.name, sizeof(vcap->driver)); |
648 | strlcpy(vcap->card, "B&W Quickcam", sizeof(vcap->card)); | |
649 | strlcpy(vcap->bus_info, "parport", sizeof(vcap->bus_info)); | |
650 | vcap->version = KERNEL_VERSION(0, 0, 2); | |
651 | vcap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE; | |
652 | return 0; | |
653 | } | |
d56410e0 | 654 | |
483d67ff HV |
655 | static int qcam_enum_input(struct file *file, void *fh, struct v4l2_input *vin) |
656 | { | |
657 | if (vin->index > 0) | |
658 | return -EINVAL; | |
659 | strlcpy(vin->name, "Camera", sizeof(vin->name)); | |
660 | vin->type = V4L2_INPUT_TYPE_CAMERA; | |
661 | vin->audioset = 0; | |
662 | vin->tuner = 0; | |
663 | vin->std = 0; | |
664 | vin->status = 0; | |
665 | return 0; | |
666 | } | |
d56410e0 | 667 | |
483d67ff HV |
668 | static int qcam_g_input(struct file *file, void *fh, unsigned int *inp) |
669 | { | |
670 | *inp = 0; | |
671 | return 0; | |
672 | } | |
1d61aac0 | 673 | |
483d67ff HV |
674 | static int qcam_s_input(struct file *file, void *fh, unsigned int inp) |
675 | { | |
676 | return (inp > 0) ? -EINVAL : 0; | |
677 | } | |
678 | ||
679 | static int qcam_queryctrl(struct file *file, void *priv, | |
680 | struct v4l2_queryctrl *qc) | |
681 | { | |
682 | switch (qc->id) { | |
683 | case V4L2_CID_BRIGHTNESS: | |
684 | return v4l2_ctrl_query_fill(qc, 0, 255, 1, 180); | |
685 | case V4L2_CID_CONTRAST: | |
686 | return v4l2_ctrl_query_fill(qc, 0, 255, 1, 192); | |
687 | case V4L2_CID_GAMMA: | |
688 | return v4l2_ctrl_query_fill(qc, 0, 255, 1, 105); | |
689 | } | |
690 | return -EINVAL; | |
691 | } | |
692 | ||
693 | static int qcam_g_ctrl(struct file *file, void *priv, | |
694 | struct v4l2_control *ctrl) | |
695 | { | |
696 | struct qcam *qcam = video_drvdata(file); | |
697 | int ret = 0; | |
698 | ||
699 | switch (ctrl->id) { | |
700 | case V4L2_CID_BRIGHTNESS: | |
701 | ctrl->value = qcam->brightness; | |
702 | break; | |
703 | case V4L2_CID_CONTRAST: | |
704 | ctrl->value = qcam->contrast; | |
705 | break; | |
706 | case V4L2_CID_GAMMA: | |
707 | ctrl->value = qcam->whitebal; | |
708 | break; | |
1d61aac0 | 709 | default: |
483d67ff HV |
710 | ret = -EINVAL; |
711 | break; | |
1da177e4 | 712 | } |
483d67ff HV |
713 | return ret; |
714 | } | |
715 | ||
716 | static int qcam_s_ctrl(struct file *file, void *priv, | |
717 | struct v4l2_control *ctrl) | |
718 | { | |
719 | struct qcam *qcam = video_drvdata(file); | |
720 | int ret = 0; | |
721 | ||
722 | mutex_lock(&qcam->lock); | |
723 | switch (ctrl->id) { | |
724 | case V4L2_CID_BRIGHTNESS: | |
725 | qcam->brightness = ctrl->value; | |
726 | break; | |
727 | case V4L2_CID_CONTRAST: | |
728 | qcam->contrast = ctrl->value; | |
729 | break; | |
730 | case V4L2_CID_GAMMA: | |
731 | qcam->whitebal = ctrl->value; | |
732 | break; | |
733 | default: | |
734 | ret = -EINVAL; | |
735 | break; | |
736 | } | |
737 | if (ret == 0) { | |
738 | qc_setscanmode(qcam); | |
739 | qcam->status |= QC_PARAM_CHANGE; | |
740 | } | |
741 | mutex_unlock(&qcam->lock); | |
742 | return ret; | |
743 | } | |
744 | ||
745 | static int qcam_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt) | |
746 | { | |
747 | struct qcam *qcam = video_drvdata(file); | |
748 | struct v4l2_pix_format *pix = &fmt->fmt.pix; | |
749 | ||
750 | pix->width = qcam->width / qcam->transfer_scale; | |
751 | pix->height = qcam->height / qcam->transfer_scale; | |
752 | pix->pixelformat = (qcam->bpp == 4) ? V4L2_PIX_FMT_Y4 : V4L2_PIX_FMT_Y6; | |
753 | pix->field = V4L2_FIELD_NONE; | |
754 | pix->bytesperline = qcam->width; | |
755 | pix->sizeimage = qcam->width * qcam->height; | |
756 | /* Just a guess */ | |
757 | pix->colorspace = V4L2_COLORSPACE_SRGB; | |
758 | return 0; | |
759 | } | |
760 | ||
761 | static int qcam_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt) | |
762 | { | |
763 | struct v4l2_pix_format *pix = &fmt->fmt.pix; | |
764 | ||
765 | if (pix->height <= 60 || pix->width <= 80) { | |
766 | pix->height = 60; | |
767 | pix->width = 80; | |
768 | } else if (pix->height <= 120 || pix->width <= 160) { | |
769 | pix->height = 120; | |
770 | pix->width = 160; | |
771 | } else { | |
772 | pix->height = 240; | |
773 | pix->width = 320; | |
774 | } | |
775 | if (pix->pixelformat != V4L2_PIX_FMT_Y4 && | |
776 | pix->pixelformat != V4L2_PIX_FMT_Y6) | |
777 | pix->pixelformat = V4L2_PIX_FMT_Y4; | |
778 | pix->field = V4L2_FIELD_NONE; | |
779 | pix->bytesperline = pix->width; | |
780 | pix->sizeimage = pix->width * pix->height; | |
781 | /* Just a guess */ | |
782 | pix->colorspace = V4L2_COLORSPACE_SRGB; | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static int qcam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt) | |
787 | { | |
788 | struct qcam *qcam = video_drvdata(file); | |
789 | struct v4l2_pix_format *pix = &fmt->fmt.pix; | |
790 | int ret = qcam_try_fmt_vid_cap(file, fh, fmt); | |
791 | ||
792 | if (ret) | |
793 | return ret; | |
794 | qcam->width = 320; | |
795 | qcam->height = 240; | |
796 | if (pix->height == 60) | |
797 | qcam->transfer_scale = 4; | |
798 | else if (pix->height == 120) | |
799 | qcam->transfer_scale = 2; | |
800 | else | |
801 | qcam->transfer_scale = 1; | |
802 | if (pix->pixelformat == V4L2_PIX_FMT_Y6) | |
803 | qcam->bpp = 6; | |
804 | else | |
805 | qcam->bpp = 4; | |
806 | ||
807 | mutex_lock(&qcam->lock); | |
808 | qc_setscanmode(qcam); | |
809 | /* We must update the camera before we grab. We could | |
810 | just have changed the grab size */ | |
811 | qcam->status |= QC_PARAM_CHANGE; | |
812 | mutex_unlock(&qcam->lock); | |
1da177e4 LT |
813 | return 0; |
814 | } | |
815 | ||
483d67ff | 816 | static int qcam_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt) |
1da177e4 | 817 | { |
483d67ff HV |
818 | static struct v4l2_fmtdesc formats[] = { |
819 | { 0, 0, 0, | |
820 | "4-Bit Monochrome", V4L2_PIX_FMT_Y4, | |
821 | { 0, 0, 0, 0 } | |
822 | }, | |
823 | { 0, 0, 0, | |
824 | "6-Bit Monochrome", V4L2_PIX_FMT_Y6, | |
825 | { 0, 0, 0, 0 } | |
826 | }, | |
827 | }; | |
828 | enum v4l2_buf_type type = fmt->type; | |
829 | ||
830 | if (fmt->index > 1) | |
831 | return -EINVAL; | |
832 | ||
833 | *fmt = formats[fmt->index]; | |
834 | fmt->type = type; | |
835 | return 0; | |
1da177e4 LT |
836 | } |
837 | ||
838 | static ssize_t qcam_read(struct file *file, char __user *buf, | |
1d61aac0 | 839 | size_t count, loff_t *ppos) |
1da177e4 | 840 | { |
483d67ff | 841 | struct qcam *qcam = video_drvdata(file); |
1da177e4 LT |
842 | int len; |
843 | parport_claim_or_block(qcam->pdev); | |
d56410e0 | 844 | |
3593cab5 | 845 | mutex_lock(&qcam->lock); |
d56410e0 | 846 | |
1da177e4 LT |
847 | qc_reset(qcam); |
848 | ||
849 | /* Update the camera parameters if we need to */ | |
850 | if (qcam->status & QC_PARAM_CHANGE) | |
851 | qc_set(qcam); | |
852 | ||
1d61aac0 | 853 | len = qc_capture(qcam, buf, count); |
d56410e0 | 854 | |
3593cab5 | 855 | mutex_unlock(&qcam->lock); |
d56410e0 | 856 | |
1da177e4 LT |
857 | parport_release(qcam->pdev); |
858 | return len; | |
859 | } | |
d56410e0 | 860 | |
483d67ff HV |
861 | static const struct v4l2_file_operations qcam_fops = { |
862 | .owner = THIS_MODULE, | |
61df3c9b | 863 | .unlocked_ioctl = video_ioctl2, |
483d67ff HV |
864 | .read = qcam_read, |
865 | }; | |
866 | ||
867 | static const struct v4l2_ioctl_ops qcam_ioctl_ops = { | |
868 | .vidioc_querycap = qcam_querycap, | |
869 | .vidioc_g_input = qcam_g_input, | |
870 | .vidioc_s_input = qcam_s_input, | |
871 | .vidioc_enum_input = qcam_enum_input, | |
872 | .vidioc_queryctrl = qcam_queryctrl, | |
873 | .vidioc_g_ctrl = qcam_g_ctrl, | |
874 | .vidioc_s_ctrl = qcam_s_ctrl, | |
875 | .vidioc_enum_fmt_vid_cap = qcam_enum_fmt_vid_cap, | |
876 | .vidioc_g_fmt_vid_cap = qcam_g_fmt_vid_cap, | |
877 | .vidioc_s_fmt_vid_cap = qcam_s_fmt_vid_cap, | |
878 | .vidioc_try_fmt_vid_cap = qcam_try_fmt_vid_cap, | |
879 | }; | |
880 | ||
881 | /* Initialize the QuickCam driver control structure. This is where | |
882 | * defaults are set for people who don't have a config file.*/ | |
883 | ||
884 | static struct qcam *qcam_init(struct parport *port) | |
7d43cd53 | 885 | { |
483d67ff HV |
886 | struct qcam *qcam; |
887 | struct v4l2_device *v4l2_dev; | |
888 | ||
889 | qcam = kzalloc(sizeof(struct qcam), GFP_KERNEL); | |
890 | if (qcam == NULL) | |
891 | return NULL; | |
892 | ||
893 | v4l2_dev = &qcam->v4l2_dev; | |
894 | strlcpy(v4l2_dev->name, "bw-qcam", sizeof(v4l2_dev->name)); | |
7d43cd53 | 895 | |
483d67ff HV |
896 | if (v4l2_device_register(NULL, v4l2_dev) < 0) { |
897 | v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); | |
898 | return NULL; | |
899 | } | |
900 | ||
901 | qcam->pport = port; | |
902 | qcam->pdev = parport_register_device(port, "bw-qcam", NULL, NULL, | |
903 | NULL, 0, NULL); | |
904 | if (qcam->pdev == NULL) { | |
905 | v4l2_err(v4l2_dev, "couldn't register for %s.\n", port->name); | |
906 | kfree(qcam); | |
907 | return NULL; | |
908 | } | |
909 | ||
910 | strlcpy(qcam->vdev.name, "Connectix QuickCam", sizeof(qcam->vdev.name)); | |
911 | qcam->vdev.v4l2_dev = v4l2_dev; | |
912 | qcam->vdev.fops = &qcam_fops; | |
913 | qcam->vdev.ioctl_ops = &qcam_ioctl_ops; | |
914 | qcam->vdev.release = video_device_release_empty; | |
915 | video_set_drvdata(&qcam->vdev, qcam); | |
916 | ||
917 | mutex_init(&qcam->lock); | |
918 | ||
919 | qcam->port_mode = (QC_ANY | QC_NOTSET); | |
920 | qcam->width = 320; | |
921 | qcam->height = 240; | |
922 | qcam->bpp = 4; | |
923 | qcam->transfer_scale = 2; | |
924 | qcam->contrast = 192; | |
925 | qcam->brightness = 180; | |
926 | qcam->whitebal = 105; | |
927 | qcam->top = 1; | |
928 | qcam->left = 14; | |
929 | qcam->mode = -1; | |
930 | qcam->status = QC_PARAM_CHANGE; | |
931 | return qcam; | |
7d43cd53 HV |
932 | } |
933 | ||
483d67ff | 934 | static int qc_calibrate(struct qcam *q) |
7d43cd53 | 935 | { |
483d67ff HV |
936 | /* |
937 | * Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96 | |
938 | * The white balance is an individual value for each | |
939 | * quickcam. | |
940 | */ | |
7d43cd53 | 941 | |
483d67ff HV |
942 | int value; |
943 | int count = 0; | |
7d43cd53 | 944 | |
483d67ff HV |
945 | qc_command(q, 27); /* AutoAdjustOffset */ |
946 | qc_command(q, 0); /* Dummy Parameter, ignored by the camera */ | |
1da177e4 | 947 | |
483d67ff HV |
948 | /* GetOffset (33) will read 255 until autocalibration */ |
949 | /* is finished. After that, a value of 1-254 will be */ | |
950 | /* returned. */ | |
951 | ||
952 | do { | |
953 | qc_command(q, 33); | |
954 | value = qc_readparam(q); | |
955 | mdelay(1); | |
956 | schedule(); | |
957 | count++; | |
958 | } while (value == 0xff && count < 2048); | |
959 | ||
960 | q->whitebal = value; | |
961 | return value; | |
962 | } | |
1da177e4 LT |
963 | |
964 | static int init_bwqcam(struct parport *port) | |
965 | { | |
483d67ff | 966 | struct qcam *qcam; |
1da177e4 | 967 | |
1d61aac0 | 968 | if (num_cams == MAX_CAMS) { |
1da177e4 LT |
969 | printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS); |
970 | return -ENOSPC; | |
971 | } | |
972 | ||
1d61aac0 HV |
973 | qcam = qcam_init(port); |
974 | if (qcam == NULL) | |
1da177e4 | 975 | return -ENODEV; |
d56410e0 | 976 | |
1da177e4 LT |
977 | parport_claim_or_block(qcam->pdev); |
978 | ||
979 | qc_reset(qcam); | |
d56410e0 | 980 | |
1d61aac0 | 981 | if (qc_detect(qcam) == 0) { |
1da177e4 LT |
982 | parport_release(qcam->pdev); |
983 | parport_unregister_device(qcam->pdev); | |
984 | kfree(qcam); | |
985 | return -ENODEV; | |
986 | } | |
987 | qc_calibrate(qcam); | |
988 | ||
989 | parport_release(qcam->pdev); | |
d56410e0 | 990 | |
483d67ff | 991 | v4l2_info(&qcam->v4l2_dev, "Connectix Quickcam on %s\n", qcam->pport->name); |
d56410e0 | 992 | |
dc60de33 | 993 | if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) { |
1da177e4 LT |
994 | parport_unregister_device(qcam->pdev); |
995 | kfree(qcam); | |
996 | return -ENODEV; | |
997 | } | |
998 | ||
999 | qcams[num_cams++] = qcam; | |
1000 | ||
1001 | return 0; | |
1002 | } | |
1003 | ||
483d67ff | 1004 | static void close_bwqcam(struct qcam *qcam) |
1da177e4 LT |
1005 | { |
1006 | video_unregister_device(&qcam->vdev); | |
1007 | parport_unregister_device(qcam->pdev); | |
1008 | kfree(qcam); | |
1009 | } | |
1010 | ||
1011 | /* The parport parameter controls which parports will be scanned. | |
1012 | * Scanning all parports causes some printers to print a garbage page. | |
1013 | * -- March 14, 1999 Billy Donahue <billy@escape.com> */ | |
1014 | #ifdef MODULE | |
1015 | static char *parport[MAX_CAMS] = { NULL, }; | |
1016 | module_param_array(parport, charp, NULL, 0); | |
1017 | #endif | |
1018 | ||
1019 | static int accept_bwqcam(struct parport *port) | |
1020 | { | |
1021 | #ifdef MODULE | |
1022 | int n; | |
1023 | ||
1024 | if (parport[0] && strncmp(parport[0], "auto", 4) != 0) { | |
1025 | /* user gave parport parameters */ | |
bb2b4542 | 1026 | for (n = 0; n < MAX_CAMS && parport[n]; n++) { |
1da177e4 LT |
1027 | char *ep; |
1028 | unsigned long r; | |
1029 | r = simple_strtoul(parport[n], &ep, 0); | |
1030 | if (ep == parport[n]) { | |
1031 | printk(KERN_ERR | |
1032 | "bw-qcam: bad port specifier \"%s\"\n", | |
1033 | parport[n]); | |
1034 | continue; | |
1035 | } | |
1036 | if (r == port->number) | |
1037 | return 1; | |
1038 | } | |
1039 | return 0; | |
1040 | } | |
1041 | #endif | |
1042 | return 1; | |
1043 | } | |
1044 | ||
1045 | static void bwqcam_attach(struct parport *port) | |
1046 | { | |
1047 | if (accept_bwqcam(port)) | |
1048 | init_bwqcam(port); | |
1049 | } | |
1050 | ||
1051 | static void bwqcam_detach(struct parport *port) | |
1052 | { | |
1053 | int i; | |
1054 | for (i = 0; i < num_cams; i++) { | |
483d67ff | 1055 | struct qcam *qcam = qcams[i]; |
1da177e4 LT |
1056 | if (qcam && qcam->pdev->port == port) { |
1057 | qcams[i] = NULL; | |
1058 | close_bwqcam(qcam); | |
1059 | } | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | static struct parport_driver bwqcam_driver = { | |
1064 | .name = "bw-qcam", | |
1065 | .attach = bwqcam_attach, | |
1066 | .detach = bwqcam_detach, | |
1067 | }; | |
1068 | ||
1069 | static void __exit exit_bw_qcams(void) | |
1070 | { | |
1071 | parport_unregister_driver(&bwqcam_driver); | |
1072 | } | |
1073 | ||
1074 | static int __init init_bw_qcams(void) | |
1075 | { | |
1076 | #ifdef MODULE | |
1077 | /* Do some sanity checks on the module parameters. */ | |
1078 | if (maxpoll > 5000) { | |
1d61aac0 | 1079 | printk(KERN_INFO "Connectix Quickcam max-poll was above 5000. Using 5000.\n"); |
1da177e4 LT |
1080 | maxpoll = 5000; |
1081 | } | |
d56410e0 | 1082 | |
1da177e4 | 1083 | if (yieldlines < 1) { |
1d61aac0 | 1084 | printk(KERN_INFO "Connectix Quickcam yieldlines was less than 1. Using 1.\n"); |
1da177e4 LT |
1085 | yieldlines = 1; |
1086 | } | |
1087 | #endif | |
1088 | return parport_register_driver(&bwqcam_driver); | |
1089 | } | |
1090 | ||
1091 | module_init(init_bw_qcams); | |
1092 | module_exit(exit_bw_qcams); | |
1093 | ||
1094 | MODULE_LICENSE("GPL"); |