1/* $NetBSD: ss_mustek.c,v 1.43 2016/11/20 15:37:19 mlelstv 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 1.43 2016/11/20 15:37:19 mlelstv 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/bufq.h> 60#include <sys/proc.h> 61#include <sys/device.h> 62#include <sys/conf.h> /* for cdevsw */ 63#include <sys/scanio.h> 64 65#include <dev/scsipi/scsipi_all.h> 66#include <dev/scsipi/scsi_all.h> 67#include <dev/scsipi/scsi_scanner.h> 68#include <dev/scsipi/scsipiconf.h> 69#include <dev/scsipi/scsipi_base.h> 70#include <dev/scsipi/ssvar.h> 71#include <dev/scsipi/ss_mustek.h> 72 73#define MUSTEK_RETRIES 4 74 75static int mustek_get_params(struct ss_softc *); 76static int mustek_set_params(struct ss_softc *, struct scan_io *); 77static int mustek_trigger_scanner(struct ss_softc *); 78static void mustek_minphys(struct ss_softc *, struct buf *); 79static int mustek_read(struct ss_softc *, struct buf *); 80static int mustek_rewind_scanner(struct ss_softc *); 81 82/* only used internally */ 83static int mustek_get_status(struct ss_softc *, int, int); 84static void mustek_compute_sizes(struct ss_softc *); 85 86/* structure for the special handlers */ 87static struct ss_special mustek_special = { 88 mustek_set_params, 89 mustek_trigger_scanner, 90 mustek_get_params, 91 mustek_minphys, 92 mustek_read, 93 mustek_rewind_scanner, 94 NULL, /* no adf support right now */ 95 NULL /* no adf support right now */ 96}; 97 98/* mustek_attach: attach special functions to ss */ 99void 100mustek_attach(struct ss_softc *ss, struct scsipibus_attach_args *sa) 101{ 102#ifdef SCSIPI_DEBUG 103 struct scsipi_periph *periph = sa->sa_periph; 104#endif 105 106 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_attach: start\n")); 107 ss->sio.scan_scanner_type = 0; 108 109 printf("\n%s: ", device_xname(ss->sc_dev)); 110 111 /* first, check the model which determines resolutions */ 112 if (!memcmp(sa->sa_inqbuf.product, "MFS-06000CX", 11)) { 113 ss->sio.scan_scanner_type = MUSTEK_06000CX; 114 printf("Mustek 6000CX Flatbed 3-pass color scanner, " 115 "3 - 600 dpi\n"); 116 } 117 if (!memcmp(sa->sa_inqbuf.product, "MFS-12000CX", 11)) { 118 ss->sio.scan_scanner_type = MUSTEK_12000CX; 119 printf("Mustek 12000CX Flatbed 3-pass color scanner, " 120 "6 - 1200 dpi\n"); 121 } 122 123 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_attach: scanner_type = %d\n", 124 ss->sio.scan_scanner_type)); 125 126 /* install special handlers */ 127 ss->special = &mustek_special; 128 129 /* 130 * populate the scanio struct with legal values 131 * the default should come from user space 132 */ 133 ss->sio.scan_width = 1200; 134 ss->sio.scan_height = 1200; 135 ss->sio.scan_x_resolution = 99; 136 ss->sio.scan_y_resolution = 99; 137 ss->sio.scan_x_origin = 0; 138 ss->sio.scan_y_origin = 0; 139 ss->sio.scan_brightness = 100; 140 ss->sio.scan_contrast = 100; 141 ss->sio.scan_quality = 100; 142 ss->sio.scan_image_mode = SIM_GRAYSCALE; 143 144 mustek_compute_sizes(ss); 145} 146 147static int 148mustek_get_params (struct ss_softc *ss) 149{ 150 return 0; 151} 152 153/* 154 * check the parameters if the mustek is capable of fulfilling it 155 * but don't send the command to the scanner in case the user wants 156 * to change parameters by more than one call 157 */ 158static int 159mustek_set_params(struct ss_softc *ss, struct scan_io *sio) 160{ 161 int error; 162 163 /* if the scanner is triggered, then rewind it */ 164 if (ss->flags & SSF_TRIGGERED) { 165 error = mustek_rewind_scanner(ss); 166 if (error) 167 return error; 168 } 169 170 /* size constraints: 8.5" horizontally and 14" vertically */ 171#ifdef MUSTEK_INCH_SPEC 172 /* sizes must be a multiple of 1/8" */ 173 sio->scan_x_origin -= sio->scan_x_origin % 150; 174 sio->scan_y_origin -= sio->scan_y_origin % 150; 175 sio->scan_width -= sio->scan_width % 150; 176 sio->scan_height -= sio->scan_height % 150; 177#endif 178 if (sio->scan_width == 0 || 179 sio->scan_x_origin + sio->scan_width > 10200 || 180 sio->scan_height == 0 || 181 sio->scan_y_origin + sio->scan_height > 16800) 182 return EINVAL; 183 184 /* 185 * for now, only realize the values for the MUSTEK_06000CX 186 * in the future, values for the MUSTEK_12000CX will be implemented 187 */ 188 189 /* 190 * resolution (dpi) must be <= 300 and a multiple of 3 or 191 * between 300 and 600 and a multiple of 30 192 */ 193 sio->scan_x_resolution -= sio->scan_x_resolution <= 300 ? 194 sio->scan_x_resolution % 3 : sio->scan_x_resolution % 30; 195 sio->scan_y_resolution -= sio->scan_y_resolution <= 300 ? 196 sio->scan_y_resolution % 3 : sio->scan_y_resolution % 30; 197 if (sio->scan_x_resolution < 3 || sio->scan_x_resolution > 600 || 198 sio->scan_x_resolution != sio->scan_y_resolution) 199 return EINVAL; 200 201 /* assume brightness values are between 64 and 136 in steps of 3 */ 202 sio->scan_brightness -= (sio->scan_brightness - 64) % 3; 203 if (sio->scan_brightness < 64 || sio->scan_brightness > 136) 204 return EINVAL; 205 206 /* contrast values must be between 16 and 184 in steps of 7 */ 207 sio->scan_contrast -= (sio->scan_contrast - 16) % 7; 208 if (sio->scan_contrast < 16 || sio->scan_contrast > 184) 209 return EINVAL; 210 211 /* 212 * velocity: between 0 (fast) and 4 (slow) which will be mapped 213 * to 100% = 4, 80% = 3, 60% = 2, 40% = 1, 20% = 0 214 * must be a multiple of 20 215 */ 216 sio->scan_quality -= sio->scan_quality % 20; 217 if (sio->scan_quality < 20 || sio->scan_quality > 100) 218 return EINVAL; 219 220 switch (sio->scan_image_mode) { 221 case SIM_BINARY_MONOCHROME: 222 case SIM_DITHERED_MONOCHROME: 223 case SIM_GRAYSCALE: 224 case SIM_RED: 225 case SIM_GREEN: 226 case SIM_BLUE: 227 break; 228 default: 229 return EINVAL; 230 } 231 232 /* change ss_softc to the new values, but save ro-variables */ 233 sio->scan_scanner_type = ss->sio.scan_scanner_type; 234 memcpy(&ss->sio, sio, sizeof(struct scan_io)); 235 236 mustek_compute_sizes(ss); 237 238 return 0; 239} 240 241/* 242 * trim the requested transfer to a multiple of the line size 243 * this is called only from ssread() which guarantees, scanner is triggered 244 * In the future, it will trim the transfer to not read to much at a time 245 * because the mustek cannot disconnect. It will be calculated by the 246 * resolution, the velocity and the number of bytes per line. 247 */ 248static void 249mustek_minphys(struct ss_softc *ss, struct buf *bp) 250{ 251#ifdef SCSIPI_DEBUG 252 struct scsipi_periph *periph = ss->sc_periph; 253#endif 254 255 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_minphys: before: %d\n", 256 bp->b_bcount)); 257 bp->b_bcount -= bp->b_bcount % 258 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 259 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_minphys: after: %d\n", 260 bp->b_bcount)); 261} 262 263/* 264 * trigger the scanner to start a scan operation 265 * this includes sending the mode- and window-data, starting the scanner 266 * and getting the image size info 267 */ 268static int 269mustek_trigger_scanner(struct ss_softc *ss) 270{ 271 struct mustek_mode_select_cmd mode_cmd; 272 struct mustek_mode_select_data mode_data; 273 struct mustek_set_window_cmd window_cmd; 274 struct mustek_set_window_data window_data; 275 struct mustek_start_scan_cmd start_scan_cmd; 276 struct scsipi_periph *periph = ss->sc_periph; 277 int pixel_tlx, pixel_tly, pixel_brx, pixel_bry, paperlength; 278 int error; 279 280 mustek_compute_sizes(ss); 281 282 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner\n")); 283 284 /* set the window params and send the scsi command */ 285 memset(&window_cmd, 0, sizeof(window_cmd)); 286 window_cmd.opcode = MUSTEK_SET_WINDOW; 287 window_cmd.length = sizeof(window_data); 288 289 memset(&window_data, 0, sizeof(window_data)); 290 window_data.frame.header = MUSTEK_LINEART_BACKGROUND | MUSTEK_UNIT_SPEC; 291#ifdef MUSTEK_INCH_SPEC 292 /* the positional values are all 1 byte because 256 / 8 = 32" */ 293 pixel_tlx = ss->sio.scan_x_origin / 150; 294 pixel_tly = ss->sio.scan_y_origin / 150; 295 pixel_brx = pixel_tlx + ss->sio.scan_width / 150; 296 pixel_bry = pixel_tly + ss->sio.scan_height / 150; 297#else 298 pixel_tlx = (ss->sio.scan_x_origin * ss->sio.scan_x_resolution) / 1200; 299 pixel_tly = (ss->sio.scan_y_origin * ss->sio.scan_y_resolution) / 1200; 300 pixel_brx = pixel_tlx + 301 (ss->sio.scan_width * ss->sio.scan_x_resolution) / 1200; 302 pixel_bry = pixel_tly + 303 (ss->sio.scan_height * ss->sio.scan_y_resolution) / 1200; 304#endif 305 _lto2l(pixel_tlx, window_data.frame.tl_x); 306 _lto2l(pixel_tly, window_data.frame.tl_y); 307 _lto2l(pixel_brx, window_data.frame.br_x); 308 _lto2l(pixel_bry, window_data.frame.br_y); 309 310#if MUSTEK_WINDOWS >= 1 311 window_data.window1 = window_data.frame; 312 window_data.window1.header = MUSTEK_WINDOW_MASK | MUSTEK_UNIT_SPEC; 313#endif 314 315 /* send the set window command to the scanner */ 316 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_set_parms: set_window\n")); 317 error = scsipi_command(periph, (void *)&window_cmd, sizeof(window_cmd), 318 (void *)&window_data, sizeof(window_data), 319 MUSTEK_RETRIES, 5000, NULL, XS_CTL_DATA_OUT); 320 if (error) 321 return error; 322 323 /* 324 * do what it takes to actualize the mode 325 */ 326 memset(&mode_cmd, 0, sizeof(mode_cmd)); 327 mode_cmd.opcode = MUSTEK_MODE_SELECT; 328 _lto2b(sizeof(mode_data), mode_cmd.length); 329 330 memset(&mode_data, 0, sizeof(mode_data)); 331 mode_data.mode = 332 MUSTEK_MODE_MASK | MUSTEK_HT_PATTERN_BUILTIN | MUSTEK_UNIT_SPEC; 333 if (ss->sio.scan_x_resolution <= 300) 334 mode_data.resolution = ss->sio.scan_x_resolution / 3; 335 else 336 /* 337 * the resolution values is computed by modulo 100, but not 338 * for 600dpi, where the value is 100 (a bit tricky, but ...) 339 */ 340 mode_data.resolution = 341 ((ss->sio.scan_x_resolution - 1) % 100) + 1; 342 343 mode_data.brightness = (ss->sio.scan_brightness - 64) / 3; 344 mode_data.contrast = (ss->sio.scan_contrast - 16) / 7; 345 mode_data.grain = 0; 346 mode_data.velocity = ss->sio.scan_quality / 20 - 1; 347#ifdef MUSTEK_INCH_SPEC 348 paperlength = 14 * 8; /* 14" */ 349#else 350 paperlength = 14 * ss->sio.scan_y_resolution; /* 14" */ 351#endif 352 _lto2l(paperlength, mode_data.paperlength); 353 354 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner: mode_select\n")); 355 /* send the command to the scanner */ 356 error = scsipi_command(periph, (void *)&mode_cmd, sizeof(mode_cmd), 357 (void *)&mode_data, sizeof(mode_data), 358 MUSTEK_RETRIES, 5000, NULL, XS_CTL_DATA_OUT); 359 if (error) 360 return error; 361 362 /* 363 * now construct and send the start command 364 */ 365 memset(&start_scan_cmd, 0, sizeof(start_scan_cmd)); 366 start_scan_cmd.opcode = MUSTEK_START_STOP; 367 start_scan_cmd.mode = MUSTEK_SCAN_START; 368 if (ss->sio.scan_x_resolution <= 300) 369 start_scan_cmd.mode |= MUSTEK_RES_STEP_1; 370 else 371 start_scan_cmd.mode |= MUSTEK_RES_STEP_10; 372 switch (ss->sio.scan_image_mode) { 373 case SIM_BINARY_MONOCHROME: 374 case SIM_DITHERED_MONOCHROME: 375 start_scan_cmd.mode |= MUSTEK_BIT_MODE | MUSTEK_GRAY_FILTER; 376 break; 377 case SIM_GRAYSCALE: 378 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_GRAY_FILTER; 379 break; 380 case SIM_RED: 381 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_RED_FILTER; 382 break; 383 case SIM_GREEN: 384 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_GREEN_FILTER; 385 break; 386 case SIM_BLUE: 387 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_BLUE_FILTER; 388 break; 389 } 390 391 /* send the command to the scanner */ 392 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner: start_scan\n")); 393 error = scsipi_command(periph, 394 (void *)&start_scan_cmd, sizeof(start_scan_cmd), NULL, 0, 395 MUSTEK_RETRIES, 5000, NULL, 0); 396 if (error) 397 return error; 398 399 /* 400 * now check if scanner ready this time with update of size info 401 * we wait here so that if the user issues a read directly afterwards, 402 * the scanner will respond directly (otherwise we had to sleep with 403 * a buffer locked in memory) 404 */ 405 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_trigger_scanner: get_status\n")); 406 error = mustek_get_status(ss, 60, 1); 407 if (error) 408 return error; 409 410 return 0; 411} 412 413/* stop a scan operation in progress */ 414static int 415mustek_rewind_scanner(struct ss_softc *ss) 416{ 417 struct mustek_start_scan_cmd cmd; 418 struct scsipi_periph *periph = ss->sc_periph; 419 int error; 420 421 if (ss->sio.scan_window_size != 0) { 422 /* 423 * only if not all data has been read, the scanner has to be 424 * stopped 425 */ 426 memset(&cmd, 0, sizeof(cmd)); 427 cmd.opcode = MUSTEK_START_STOP; 428 cmd.mode = MUSTEK_SCAN_STOP; 429 430 /* send the command to the scanner */ 431 SC_DEBUG(periph, SCSIPI_DB1, 432 ("mustek_rewind_scanner: stop_scan\n")); 433 error = scsipi_command(periph, 434 (void *)&cmd, sizeof(cmd), 435 NULL, 0, 436 MUSTEK_RETRIES, 5000, NULL, 0); 437 if (error) 438 return error; 439 } 440 441 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_rewind_scanner: end\n")); 442 443 return 0; 444} 445 446/* read the requested number of bytes/lines from the scanner */ 447static int 448mustek_read(struct ss_softc *ss, struct buf *bp) 449{ 450 struct mustek_read_cmd cmd; 451 struct scsipi_xfer *xs; 452 struct scsipi_periph *periph = ss->sc_periph; 453 u_long lines_to_read; 454 int error __diagused; 455 456 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_read: start\n")); 457 458 memset(&cmd, 0, sizeof(cmd)); 459 cmd.opcode = MUSTEK_READ; 460 461 /* instead of the bytes, the mustek wants the number of lines */ 462 lines_to_read = bp->b_bcount / 463 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 464 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_read: read %ld lines\n", 465 lines_to_read)); 466 _lto3b(lines_to_read, cmd.length); 467 468 /* go ask the adapter to do all this for us */ 469 xs = scsipi_make_xs_locked(periph, 470 (struct scsipi_generic *) &cmd, sizeof(cmd), 471 (u_char *) bp->b_data, bp->b_bcount, 472 MUSTEK_RETRIES, 10000, bp, 473 XS_CTL_NOSLEEP | XS_CTL_ASYNC | XS_CTL_DATA_IN); 474 if (xs == NULL) { 475 /* 476 * out of memory. Keep this buffer in the queue, and 477 * retry later. 478 */ 479 callout_reset(&ss->sc_callout, hz / 2, ssrestart, 480 periph); 481 return 0; 482 } 483#ifdef DIAGNOSTIC 484 if (bufq_get(ss->buf_queue) != bp) 485 panic("ssstart(): dequeued wrong buf"); 486#else 487 bufq_get(ss->buf_queue); 488#endif 489 error = scsipi_execute_xs(xs); 490 /* with a scsipi_xfer preallocated, scsipi_command can't fail */ 491 KASSERT(error == 0); 492 ss->sio.scan_lines -= lines_to_read; 493#if 0 494 if (ss->sio.scan_lines < 0) 495 ss->sio.scan_lines = 0; 496#endif 497 ss->sio.scan_window_size -= bp->b_bcount; 498#if 0 499 if (ss->sio.scan_window_size < 0) 500 ss->sio.scan_window_size = 0; 501#endif 502 return 0; 503} 504 505/* 506 * check if the scanner is ready to take commands 507 * wait timeout seconds and try only every second 508 * if update, then update picture size info 509 * 510 * returns EBUSY if scanner not ready 511 */ 512static int 513mustek_get_status(struct ss_softc *ss, int timeout, int update) 514{ 515 struct mustek_get_status_cmd cmd; 516 struct mustek_get_status_data data; 517 struct scsipi_periph *periph = ss->sc_periph; 518 int error, lines, bytes_per_line; 519 520 memset(&cmd, 0, sizeof(cmd)); 521 cmd.opcode = MUSTEK_GET_STATUS; 522 cmd.length = sizeof(data); 523 524 while (1) { 525 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_get_status: stat_cmd\n")); 526 error = scsipi_command(periph, (void *)&cmd, sizeof(cmd), 527 (void *)&data, sizeof(data), 528 MUSTEK_RETRIES, 5000, NULL, XS_CTL_DATA_IN); 529 if (error) 530 return error; 531 if ((data.ready_busy == MUSTEK_READY) || 532 (timeout-- <= 0)) 533 break; 534 /* please wait a second */ 535 kpause("mtkrdy", false, hz, NULL); 536 } 537 538 if (update) { 539 bytes_per_line = _2ltol(data.bytes_per_line); 540 lines = _3ltol(data.lines); 541 if (lines != ss->sio.scan_lines) { 542 printf("mustek: lines actual(%d) != computed(%ld)\n", 543 lines, ss->sio.scan_lines); 544 return EIO; 545 } 546 if (bytes_per_line * lines != ss->sio.scan_window_size) { 547 printf("mustek: win-size actual(%d) != computed(%ld)\n", 548 bytes_per_line * lines, ss->sio.scan_window_size); 549 return EIO; 550 } 551 552 SC_DEBUG(periph, SCSIPI_DB1, 553 ("mustek_get_size: bpl=%ld, lines=%ld\n", 554 (ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) 555 / 8, ss->sio.scan_lines)); 556 SC_DEBUG(periph, SCSIPI_DB1, ("window size = %ld\n", 557 ss->sio.scan_window_size)); 558 } 559 560 SC_DEBUG(periph, SCSIPI_DB1, ("mustek_get_status: end\n")); 561 if (data.ready_busy == MUSTEK_READY) 562 return 0; 563 else 564 return EBUSY; 565} 566 567/* 568 * mustek_compute_sizes: compute window_size and lines for the picture 569 * this function is called from different places in the code 570 */ 571static void 572mustek_compute_sizes(struct ss_softc *ss) 573{ 574 575 switch (ss->sio.scan_image_mode) { 576 case SIM_BINARY_MONOCHROME: 577 case SIM_DITHERED_MONOCHROME: 578 ss->sio.scan_bits_per_pixel = 1; 579 break; 580 case SIM_GRAYSCALE: 581 case SIM_RED: 582 case SIM_GREEN: 583 case SIM_BLUE: 584 ss->sio.scan_bits_per_pixel = 8; 585 break; 586 } 587 588 /* 589 * horizontal number of bytes is always a multiple of 2, 590 * in 8-bit mode at least 591 */ 592 ss->sio.scan_pixels_per_line = 593 (ss->sio.scan_width * ss->sio.scan_x_resolution) / 1200; 594 if (ss->sio.scan_bits_per_pixel == 1) 595 /* make it a multiple of 16, and thus of 2 bytes */ 596 ss->sio.scan_pixels_per_line = 597 (ss->sio.scan_pixels_per_line + 15) & 0xfffffff0; 598 else 599 ss->sio.scan_pixels_per_line = 600 (ss->sio.scan_pixels_per_line + 1) & 0xfffffffe; 601 602 ss->sio.scan_lines = 603 (ss->sio.scan_height * ss->sio.scan_y_resolution) / 1200; 604 ss->sio.scan_window_size = ss->sio.scan_lines * 605 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 606} 607