1 /* $NetBSD: ss_mustek.c,v 1.18 2001/11/15 09:48:18 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Joachim Koenig-Baltes. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Joachim Koenig-Baltes. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * special driver for MUSTEK flatbed scanners MFS 06000CX and MFS 12000CX 34 * these scanners come with their own scsi card, containing an NCR53C400 35 * SCSI controller chip. I'm in the progress of writing a driver for this 36 * card to work under NetBSD-current. I've hooked it up to a Seagate ST01 37 * hostadapter in the meantime, giving 350KB/sec for higher resolutions! 38 * 39 * I tried to connect it to my Adaptec 1542B, but with no success. It seems, 40 * it does not like synchronous negotiation between Hostadapter and other 41 * targets, but I could not turn this off for the 1542B. 42 * 43 * There is also an other reason why you would not like to connect it to your 44 * favourite SCSI host adapter: The Mustek DOES NOT DISCONNECT. It will block 45 * other traffic from the bus while a transfer is active. 46 */ 47 48 #include <sys/cdefs.h> 49 __KERNEL_RCSID(0, "$NetBSD: ss_mustek.c,v 1.18 2001/11/15 09:48:18 lukem Exp $"); 50 51 #include <sys/param.h> 52 #include <sys/kernel.h> 53 #include <sys/systm.h> 54 #include <sys/fcntl.h> 55 #include <sys/errno.h> 56 #include <sys/ioctl.h> 57 #include <sys/malloc.h> 58 #include <sys/buf.h> 59 #include <sys/proc.h> 60 #include <sys/user.h> 61 #include <sys/device.h> 62 #include <sys/conf.h> /* for cdevsw */ 63 #include <sys/scanio.h> 64 65 #include <dev/scsipi/scsi_all.h> 66 #include <dev/scsipi/scsipi_all.h> 67 #include <dev/scsipi/scsi_scanner.h> 68 #include <dev/scsipi/scsiconf.h> 69 #include <dev/scsipi/ssvar.h> 70 #include <dev/scsipi/ss_mustek.h> 71 72 #define MUSTEK_RETRIES 4 73 74 int mustek_get_params __P((struct ss_softc *)); 75 int mustek_set_params __P((struct ss_softc *, struct scan_io *)); 76 int mustek_trigger_scanner __P((struct ss_softc *)); 77 void mustek_minphys __P((struct ss_softc *, struct buf *)); 78 int mustek_read __P((struct ss_softc *, struct buf *)); 79 int mustek_rewind_scanner __P((struct ss_softc *)); 80 81 /* only used internally */ 82 int mustek_get_status __P((struct ss_softc *, int, int)); 83 void mustek_compute_sizes __P((struct ss_softc *)); 84 85 /* 86 * structure for the special handlers 87 */ 88 struct ss_special mustek_special = { 89 mustek_set_params, 90 mustek_trigger_scanner, 91 mustek_get_params, 92 mustek_minphys, 93 mustek_read, 94 mustek_rewind_scanner, 95 NULL, /* no adf support right now */ 96 NULL /* no adf support right now */ 97 }; 98 99 /* 100 * mustek_attach: attach special functions to ss 101 */ 102 void 103 mustek_attach(ss, sa) 104 struct ss_softc *ss; 105 struct scsipibus_attach_args *sa; 106 { 107 #ifdef SCSIPI_DEBUG 108 struct scsipi_periph *periph = sa->sa_periph; 109 #endif 110 111 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_attach: start\n")); 112 ss->sio.scan_scanner_type = 0; 113 114 printf("\n%s: ", ss->sc_dev.dv_xname); 115 116 /* first, check the model which determines resolutions */ 117 if (!memcmp(sa->sa_inqbuf.product, "MFS-06000CX", 11)) { 118 ss->sio.scan_scanner_type = MUSTEK_06000CX; 119 printf("Mustek 6000CX Flatbed 3-pass color scanner, 3 - 600 dpi\n"); 120 } 121 if (!memcmp(sa->sa_inqbuf.product, "MFS-12000CX", 11)) { 122 ss->sio.scan_scanner_type = MUSTEK_12000CX; 123 printf("Mustek 12000CX Flatbed 3-pass color scanner, 6 - 1200 dpi\n"); 124 } 125 126 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_attach: scanner_type = %d\n", 127 ss->sio.scan_scanner_type)); 128 129 /* install special handlers */ 130 ss->special = &mustek_special; 131 132 /* 133 * populate the scanio struct with legal values 134 * the default should come from user space 135 */ 136 ss->sio.scan_width = 1200; 137 ss->sio.scan_height = 1200; 138 ss->sio.scan_x_resolution = 99; 139 ss->sio.scan_y_resolution = 99; 140 ss->sio.scan_x_origin = 0; 141 ss->sio.scan_y_origin = 0; 142 ss->sio.scan_brightness = 100; 143 ss->sio.scan_contrast = 100; 144 ss->sio.scan_quality = 100; 145 ss->sio.scan_image_mode = SIM_GRAYSCALE; 146 147 mustek_compute_sizes(ss); 148 } 149 150 int 151 mustek_get_params (ss) 152 struct ss_softc *ss; 153 { 154 155 return (0); 156 } 157 158 /* 159 * check the parameters if the mustek is capable of fulfilling it 160 * but don't send the command to the scanner in case the user wants 161 * to change parameters by more than one call 162 */ 163 int 164 mustek_set_params(ss, sio) 165 struct ss_softc *ss; 166 struct scan_io *sio; 167 { 168 int error; 169 170 /* 171 * if the scanner is triggered, then rewind it 172 */ 173 if (ss->flags & SSF_TRIGGERED) { 174 error = mustek_rewind_scanner(ss); 175 if (error) 176 return (error); 177 } 178 179 /* size constraints: 8.5" horizontally and 14" vertically */ 180 #ifdef MUSTEK_INCH_SPEC 181 /* sizes must be a multiple of 1/8" */ 182 sio->scan_x_origin -= sio->scan_x_origin % 150; 183 sio->scan_y_origin -= sio->scan_y_origin % 150; 184 sio->scan_width -= sio->scan_width % 150; 185 sio->scan_height -= sio->scan_height % 150; 186 #endif 187 if (sio->scan_width == 0 || 188 sio->scan_x_origin + sio->scan_width > 10200 || 189 sio->scan_height == 0 || 190 sio->scan_y_origin + sio->scan_height > 16800) 191 return (EINVAL); 192 193 /* 194 * for now, only realize the values for the MUSTEK_06000CX 195 * in the future, values for the MUSTEK_12000CX will be implemented 196 */ 197 198 /* 199 * resolution (dpi) must be <= 300 and a multiple of 3 or 200 * between 300 and 600 and a multiple of 30 201 */ 202 sio->scan_x_resolution -= sio->scan_x_resolution <= 300 ? 203 sio->scan_x_resolution % 3 : sio->scan_x_resolution % 30; 204 sio->scan_y_resolution -= sio->scan_y_resolution <= 300 ? 205 sio->scan_y_resolution % 3 : sio->scan_y_resolution % 30; 206 if (sio->scan_x_resolution < 3 || sio->scan_x_resolution > 600 || 207 sio->scan_x_resolution != sio->scan_y_resolution) 208 return (EINVAL); 209 210 /* assume brightness values are between 64 and 136 in steps of 3 */ 211 sio->scan_brightness -= (sio->scan_brightness - 64) % 3; 212 if (sio->scan_brightness < 64 || sio->scan_brightness > 136) 213 return (EINVAL); 214 215 /* contrast values must be between 16 and 184 in steps of 7 */ 216 sio->scan_contrast -= (sio->scan_contrast - 16) % 7; 217 if (sio->scan_contrast < 16 || sio->scan_contrast > 184) 218 return (EINVAL); 219 220 /* 221 * velocity: between 0 (fast) and 4 (slow) which will be mapped 222 * to 100% = 4, 80% = 3, 60% = 2, 40% = 1, 20% = 0 223 * must be a multiple of 20 224 */ 225 sio->scan_quality -= sio->scan_quality % 20; 226 if (sio->scan_quality < 20 || sio->scan_quality > 100) 227 return (EINVAL); 228 229 switch (sio->scan_image_mode) { 230 case SIM_BINARY_MONOCHROME: 231 case SIM_DITHERED_MONOCHROME: 232 case SIM_GRAYSCALE: 233 case SIM_RED: 234 case SIM_GREEN: 235 case SIM_BLUE: 236 break; 237 default: 238 return (EINVAL); 239 } 240 241 /* change ss_softc to the new values, but save ro-variables */ 242 sio->scan_scanner_type = ss->sio.scan_scanner_type; 243 memcpy(&ss->sio, sio, sizeof(struct scan_io)); 244 245 mustek_compute_sizes(ss); 246 247 return (0); 248 } 249 250 /* 251 * trim the requested transfer to a multiple of the line size 252 * this is called only from ssread() which guarantees, scanner is triggered 253 * In the future, it will trim the transfer to not read to much at a time 254 * because the mustek cannot disconnect. It will be calculated by the 255 * resolution, the velocity and the number of bytes per line. 256 */ 257 void 258 mustek_minphys(ss, bp) 259 struct ss_softc *ss; 260 struct buf *bp; 261 { 262 #ifdef SCSIPI_DEBUG 263 struct scsipi_periph *periph = ss->sc_periph; 264 #endif 265 266 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_minphys: before: %ld\n", 267 bp->b_bcount)); 268 bp->b_bcount -= bp->b_bcount % 269 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 270 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_minphys: after: %ld\n", 271 bp->b_bcount)); 272 } 273 274 /* 275 * trigger the scanner to start a scan operation 276 * this includes sending the mode- and window-data, starting the scanner 277 * and getting the image size info 278 */ 279 int 280 mustek_trigger_scanner(ss) 281 struct ss_softc *ss; 282 { 283 struct mustek_mode_select_cmd mode_cmd; 284 struct mustek_mode_select_data mode_data; 285 struct mustek_set_window_cmd window_cmd; 286 struct mustek_set_window_data window_data; 287 struct mustek_start_scan_cmd start_scan_cmd; 288 struct scsipi_periph *periph = ss->sc_periph; 289 int pixel_tlx, pixel_tly, pixel_brx, pixel_bry, paperlength; 290 int error; 291 292 mustek_compute_sizes(ss); 293 294 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner\n")); 295 296 /* 297 * set the window params and send the scsi command 298 */ 299 memset(&window_cmd, 0, sizeof(window_cmd)); 300 window_cmd.opcode = MUSTEK_SET_WINDOW; 301 window_cmd.length = sizeof(window_data); 302 303 memset(&window_data, 0, sizeof(window_data)); 304 window_data.frame.header = MUSTEK_LINEART_BACKGROUND | MUSTEK_UNIT_SPEC; 305 #ifdef MUSTEK_INCH_SPEC 306 /* the positional values are all 1 byte because 256 / 8 = 32" */ 307 pixel_tlx = ss->sio.scan_x_origin / 150; 308 pixel_tly = ss->sio.scan_y_origin / 150; 309 pixel_brx = pixel_tlx + ss->sio.scan_width / 150; 310 pixel_bry = pixel_tly + ss->sio.scan_height / 150; 311 #else 312 pixel_tlx = (ss->sio.scan_x_origin * ss->sio.scan_x_resolution) / 1200; 313 pixel_tly = (ss->sio.scan_y_origin * ss->sio.scan_y_resolution) / 1200; 314 pixel_brx = pixel_tlx + 315 (ss->sio.scan_width * ss->sio.scan_x_resolution) / 1200; 316 pixel_bry = pixel_tly + 317 (ss->sio.scan_height * ss->sio.scan_y_resolution) / 1200; 318 #endif 319 _lto2l(pixel_tlx, window_data.frame.tl_x); 320 _lto2l(pixel_tly, window_data.frame.tl_y); 321 _lto2l(pixel_brx, window_data.frame.br_x); 322 _lto2l(pixel_bry, window_data.frame.br_y); 323 324 #if MUSTEK_WINDOWS >= 1 325 window_data.window1 = window_data.frame; 326 window_data.window1.header = MUSTEK_WINDOW_MASK | MUSTEK_UNIT_SPEC; 327 #endif 328 329 /* send the set window command to the scanner */ 330 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_set_parms: set_window\n")); 331 error = scsipi_command(periph, 332 (struct scsipi_generic *) &window_cmd, 333 sizeof(window_cmd), (u_char *) &window_data, sizeof(window_data), 334 MUSTEK_RETRIES, 5000, NULL, XS_CTL_DATA_OUT | XS_CTL_DATA_ONSTACK); 335 if (error) 336 return (error); 337 338 /* 339 * do what it takes to actualize the mode 340 */ 341 memset(&mode_cmd, 0, sizeof(mode_cmd)); 342 mode_cmd.opcode = MUSTEK_MODE_SELECT; 343 _lto2b(sizeof(mode_data), mode_cmd.length); 344 345 memset(&mode_data, 0, sizeof(mode_data)); 346 mode_data.mode = 347 MUSTEK_MODE_MASK | MUSTEK_HT_PATTERN_BUILTIN | MUSTEK_UNIT_SPEC; 348 if (ss->sio.scan_x_resolution <= 300) { 349 mode_data.resolution = ss->sio.scan_x_resolution / 3; 350 } else { 351 /* 352 * the resolution values is computed by modulo 100, but not 353 * for 600dpi, where the value is 100 (a bit tricky, but ...) 354 */ 355 mode_data.resolution = 356 ((ss->sio.scan_x_resolution - 1) % 100) + 1; 357 } 358 mode_data.brightness = (ss->sio.scan_brightness - 64) / 3; 359 mode_data.contrast = (ss->sio.scan_contrast - 16) / 7; 360 mode_data.grain = 0; 361 mode_data.velocity = ss->sio.scan_quality / 20 - 1; 362 #ifdef MUSTEK_INCH_SPEC 363 paperlength = 14 * 8; /* 14" */ 364 #else 365 paperlength = 14 * ss->sio.scan_y_resolution; /* 14" */ 366 #endif 367 _lto2l(paperlength, mode_data.paperlength); 368 369 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner: mode_select\n")); 370 /* send the command to the scanner */ 371 error = scsipi_command(periph, 372 (struct scsipi_generic *) &mode_cmd, 373 sizeof(mode_cmd), (u_char *) &mode_data, sizeof(mode_data), 374 MUSTEK_RETRIES, 5000, NULL, XS_CTL_DATA_OUT | XS_CTL_DATA_ONSTACK); 375 if (error) 376 return (error); 377 378 /* 379 * now construct and send the start command 380 */ 381 memset(&start_scan_cmd, 0, sizeof(start_scan_cmd)); 382 start_scan_cmd.opcode = MUSTEK_START_STOP; 383 start_scan_cmd.mode = MUSTEK_SCAN_START; 384 if (ss->sio.scan_x_resolution <= 300) 385 start_scan_cmd.mode |= MUSTEK_RES_STEP_1; 386 else 387 start_scan_cmd.mode |= MUSTEK_RES_STEP_10; 388 switch (ss->sio.scan_image_mode) { 389 case SIM_BINARY_MONOCHROME: 390 case SIM_DITHERED_MONOCHROME: 391 start_scan_cmd.mode |= MUSTEK_BIT_MODE | MUSTEK_GRAY_FILTER; 392 break; 393 case SIM_GRAYSCALE: 394 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_GRAY_FILTER; 395 break; 396 case SIM_RED: 397 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_RED_FILTER; 398 break; 399 case SIM_GREEN: 400 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_GREEN_FILTER; 401 break; 402 case SIM_BLUE: 403 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_BLUE_FILTER; 404 break; 405 } 406 407 /* send the command to the scanner */ 408 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner: start_scan\n")); 409 error = scsipi_command(periph, 410 (struct scsipi_generic *) &start_scan_cmd, 411 sizeof(start_scan_cmd), NULL, 0, 412 MUSTEK_RETRIES, 5000, NULL, 0); 413 if (error) 414 return (error); 415 416 /* 417 * now check if scanner ready this time with update of size info 418 * we wait here so that if the user issues a read directly afterwards, 419 * the scanner will respond directly (otherwise we had to sleep with 420 * a buffer locked in memory) 421 */ 422 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner: get_status\n")); 423 error = mustek_get_status(ss, 60, 1); 424 if (error) 425 return (error); 426 427 return (0); 428 } 429 430 /* 431 * stop a scan operation in progress 432 */ 433 int 434 mustek_rewind_scanner(ss) 435 struct ss_softc *ss; 436 { 437 struct mustek_start_scan_cmd cmd; 438 struct scsipi_periph *periph = ss->sc_periph; 439 int error; 440 441 if (ss->sio.scan_window_size != 0) { 442 /* 443 * only if not all data has been read, the scanner has to be 444 * stopped 445 */ 446 memset(&cmd, 0, sizeof(cmd)); 447 cmd.opcode = MUSTEK_START_STOP; 448 cmd.mode = MUSTEK_SCAN_STOP; 449 450 /* send the command to the scanner */ 451 SC_DEBUG(periph, SCSIPI_DB1, 452 ("mustek_rewind_scanner: stop_scan\n")); 453 error = scsipi_command(periph, 454 (struct scsipi_generic *) &cmd, 455 sizeof(cmd), NULL, 0, MUSTEK_RETRIES, 5000, NULL, 0); 456 if (error) 457 return (error); 458 } 459 460 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_rewind_scanner: end\n")); 461 462 return (0); 463 } 464 465 /* 466 * read the requested number of bytes/lines from the scanner 467 */ 468 int 469 mustek_read(ss, bp) 470 struct ss_softc *ss; 471 struct buf *bp; 472 { 473 struct mustek_read_cmd cmd; 474 struct scsipi_periph *periph = ss->sc_periph; 475 u_long lines_to_read; 476 int error; 477 478 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_read: start\n")); 479 480 memset(&cmd, 0, sizeof(cmd)); 481 cmd.opcode = MUSTEK_READ; 482 483 /* instead of the bytes, the mustek wants the number of lines */ 484 lines_to_read = bp->b_bcount / 485 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 486 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_read: read %ld lines\n", 487 lines_to_read)); 488 _lto3b(lines_to_read, cmd.length); 489 490 /* 491 * go ask the adapter to do all this for us 492 */ 493 error = scsipi_command(periph, 494 (struct scsipi_generic *) &cmd, sizeof(cmd), 495 (u_char *) bp->b_data, bp->b_bcount, MUSTEK_RETRIES, 10000, bp, 496 XS_CTL_NOSLEEP | XS_CTL_ASYNC | XS_CTL_DATA_IN); 497 if (error) { 498 printf("%s: not queued, error %d\n", ss->sc_dev.dv_xname, 499 error); 500 } else { 501 ss->sio.scan_lines -= lines_to_read; 502 if (ss->sio.scan_lines < 0) 503 ss->sio.scan_lines = 0; 504 ss->sio.scan_window_size -= bp->b_bcount; 505 if (ss->sio.scan_window_size < 0) 506 ss->sio.scan_window_size = 0; 507 } 508 509 return (0); 510 } 511 512 /* 513 * check if the scanner is ready to take commands 514 * wait timeout seconds and try only every second 515 * if update, then update picture size info 516 * 517 * returns EBUSY if scanner not ready 518 */ 519 int 520 mustek_get_status(ss, timeout, update) 521 struct ss_softc *ss; 522 int timeout, update; 523 { 524 struct mustek_get_status_cmd cmd; 525 struct mustek_get_status_data data; 526 struct scsipi_periph *periph = ss->sc_periph; 527 int error, lines, bytes_per_line; 528 529 memset(&cmd, 0, sizeof(cmd)); 530 cmd.opcode = MUSTEK_GET_STATUS; 531 cmd.length = sizeof(data); 532 533 while (1) { 534 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_get_status: stat_cmd\n")); 535 error = scsipi_command(periph, 536 (struct scsipi_generic *) &cmd, sizeof(cmd), 537 (u_char *) &data, sizeof(data), MUSTEK_RETRIES, 538 5000, NULL, XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK); 539 if (error) 540 return (error); 541 if ((data.ready_busy == MUSTEK_READY) || 542 (timeout-- <= 0)) 543 break; 544 /* please wait a second */ 545 tsleep((caddr_t)mustek_get_status, PRIBIO + 1, "mtkrdy", hz); 546 } 547 548 if (update) { 549 bytes_per_line = _2ltol(data.bytes_per_line); 550 lines = _3ltol(data.lines); 551 if (lines != ss->sio.scan_lines) { 552 printf("mustek: lines actual(%d) != computed(%ld)\n", 553 lines, ss->sio.scan_lines); 554 return (EIO); 555 } 556 if (bytes_per_line * lines != ss->sio.scan_window_size) { 557 printf("mustek: win-size actual(%d) != computed(%ld)\n", 558 bytes_per_line * lines, ss->sio.scan_window_size); 559 return (EIO); 560 } 561 562 SC_DEBUG(periph, SCSIPI_DB1, 563 ("mustek_get_size: bpl=%ld, lines=%ld\n", 564 (ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8, 565 ss->sio.scan_lines)); 566 SC_DEBUG(periph, SCSIPI_DB1, ("window size = %ld\n", 567 ss->sio.scan_window_size)); 568 } 569 570 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_get_status: end\n")); 571 if (data.ready_busy == MUSTEK_READY) 572 return (0); 573 else 574 return (EBUSY); 575 } 576 577 /* 578 * mustek_compute_sizes: compute window_size and lines for the picture 579 * this function is called from different places in the code 580 */ 581 void 582 mustek_compute_sizes(ss) 583 struct ss_softc *ss; 584 { 585 586 switch (ss->sio.scan_image_mode) { 587 case SIM_BINARY_MONOCHROME: 588 case SIM_DITHERED_MONOCHROME: 589 ss->sio.scan_bits_per_pixel = 1; 590 break; 591 case SIM_GRAYSCALE: 592 case SIM_RED: 593 case SIM_GREEN: 594 case SIM_BLUE: 595 ss->sio.scan_bits_per_pixel = 8; 596 break; 597 } 598 599 /* 600 * horizontal number of bytes is always a multiple of 2, 601 * in 8-bit mode at least 602 */ 603 ss->sio.scan_pixels_per_line = 604 (ss->sio.scan_width * ss->sio.scan_x_resolution) / 1200; 605 if (ss->sio.scan_bits_per_pixel == 1) 606 /* make it a multiple of 16, and thus of 2 bytes */ 607 ss->sio.scan_pixels_per_line = 608 (ss->sio.scan_pixels_per_line + 15) & 0xfffffff0; 609 else 610 ss->sio.scan_pixels_per_line = 611 (ss->sio.scan_pixels_per_line + 1) & 0xfffffffe; 612 613 ss->sio.scan_lines = 614 (ss->sio.scan_height * ss->sio.scan_y_resolution) / 1200; 615 ss->sio.scan_window_size = ss->sio.scan_lines * 616 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 617 } 618