1 /* 2 * udlfb.c -- Framebuffer driver for DisplayLink USB controller 3 * 4 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> 5 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> 6 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License v2. See the file COPYING in the main directory of this archive for 10 * more details. 11 * 12 * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven, 13 * usb-skeleton by GregKH. 14 * 15 * Device-specific portions based on information from Displaylink, with work 16 * from Florian Echtler, Henrik Bjerregaard Pedersen, and others. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/init.h> 22 #include <linux/usb.h> 23 #include <linux/uaccess.h> 24 #include <linux/mm.h> 25 #include <linux/fb.h> 26 #include <linux/vmalloc.h> 27 #include <linux/slab.h> 28 #include <linux/delay.h> 29 #include <asm/unaligned.h> 30 #include <video/udlfb.h> 31 #include "edid.h" 32 33 static const struct fb_fix_screeninfo dlfb_fix = { 34 .id = "udlfb", 35 .type = FB_TYPE_PACKED_PIXELS, 36 .visual = FB_VISUAL_TRUECOLOR, 37 .xpanstep = 0, 38 .ypanstep = 0, 39 .ywrapstep = 0, 40 .accel = FB_ACCEL_NONE, 41 }; 42 43 static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | 44 FBINFO_VIRTFB | 45 FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | 46 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; 47 48 /* 49 * There are many DisplayLink-based graphics products, all with unique PIDs. 50 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) 51 * We also require a match on SubClass (0x00) and Protocol (0x00), 52 * which is compatible with all known USB 2.0 era graphics chips and firmware, 53 * but allows DisplayLink to increment those for any future incompatible chips 54 */ 55 static const struct usb_device_id id_table[] = { 56 {.idVendor = 0x17e9, 57 .bInterfaceClass = 0xff, 58 .bInterfaceSubClass = 0x00, 59 .bInterfaceProtocol = 0x00, 60 .match_flags = USB_DEVICE_ID_MATCH_VENDOR | 61 USB_DEVICE_ID_MATCH_INT_CLASS | 62 USB_DEVICE_ID_MATCH_INT_SUBCLASS | 63 USB_DEVICE_ID_MATCH_INT_PROTOCOL, 64 }, 65 {}, 66 }; 67 MODULE_DEVICE_TABLE(usb, id_table); 68 69 /* module options */ 70 static bool console = 1; /* Allow fbcon to open framebuffer */ 71 static bool fb_defio = 1; /* Detect mmap writes using page faults */ 72 static bool shadow = 1; /* Optionally disable shadow framebuffer */ 73 static int pixel_limit; /* Optionally force a pixel resolution limit */ 74 75 struct dlfb_deferred_free { 76 struct list_head list; 77 void *mem; 78 }; 79 80 static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len); 81 82 /* dlfb keeps a list of urbs for efficient bulk transfers */ 83 static void dlfb_urb_completion(struct urb *urb); 84 static struct urb *dlfb_get_urb(struct dlfb_data *dlfb); 85 static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len); 86 static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size); 87 static void dlfb_free_urb_list(struct dlfb_data *dlfb); 88 89 /* 90 * All DisplayLink bulk operations start with 0xAF, followed by specific code 91 * All operations are written to buffers which then later get sent to device 92 */ 93 static char *dlfb_set_register(char *buf, u8 reg, u8 val) 94 { 95 *buf++ = 0xAF; 96 *buf++ = 0x20; 97 *buf++ = reg; 98 *buf++ = val; 99 return buf; 100 } 101 102 static char *dlfb_vidreg_lock(char *buf) 103 { 104 return dlfb_set_register(buf, 0xFF, 0x00); 105 } 106 107 static char *dlfb_vidreg_unlock(char *buf) 108 { 109 return dlfb_set_register(buf, 0xFF, 0xFF); 110 } 111 112 /* 113 * Map FB_BLANK_* to DisplayLink register 114 * DLReg FB_BLANK_* 115 * ----- ----------------------------- 116 * 0x00 FB_BLANK_UNBLANK (0) 117 * 0x01 FB_BLANK (1) 118 * 0x03 FB_BLANK_VSYNC_SUSPEND (2) 119 * 0x05 FB_BLANK_HSYNC_SUSPEND (3) 120 * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back 121 */ 122 static char *dlfb_blanking(char *buf, int fb_blank) 123 { 124 u8 reg; 125 126 switch (fb_blank) { 127 case FB_BLANK_POWERDOWN: 128 reg = 0x07; 129 break; 130 case FB_BLANK_HSYNC_SUSPEND: 131 reg = 0x05; 132 break; 133 case FB_BLANK_VSYNC_SUSPEND: 134 reg = 0x03; 135 break; 136 case FB_BLANK_NORMAL: 137 reg = 0x01; 138 break; 139 default: 140 reg = 0x00; 141 } 142 143 buf = dlfb_set_register(buf, 0x1F, reg); 144 145 return buf; 146 } 147 148 static char *dlfb_set_color_depth(char *buf, u8 selection) 149 { 150 return dlfb_set_register(buf, 0x00, selection); 151 } 152 153 static char *dlfb_set_base16bpp(char *wrptr, u32 base) 154 { 155 /* the base pointer is 16 bits wide, 0x20 is hi byte. */ 156 wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); 157 wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); 158 return dlfb_set_register(wrptr, 0x22, base); 159 } 160 161 /* 162 * DisplayLink HW has separate 16bpp and 8bpp framebuffers. 163 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer 164 */ 165 static char *dlfb_set_base8bpp(char *wrptr, u32 base) 166 { 167 wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); 168 wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); 169 return dlfb_set_register(wrptr, 0x28, base); 170 } 171 172 static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) 173 { 174 wrptr = dlfb_set_register(wrptr, reg, value >> 8); 175 return dlfb_set_register(wrptr, reg+1, value); 176 } 177 178 /* 179 * This is kind of weird because the controller takes some 180 * register values in a different byte order than other registers. 181 */ 182 static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) 183 { 184 wrptr = dlfb_set_register(wrptr, reg, value); 185 return dlfb_set_register(wrptr, reg+1, value >> 8); 186 } 187 188 /* 189 * LFSR is linear feedback shift register. The reason we have this is 190 * because the display controller needs to minimize the clock depth of 191 * various counters used in the display path. So this code reverses the 192 * provided value into the lfsr16 value by counting backwards to get 193 * the value that needs to be set in the hardware comparator to get the 194 * same actual count. This makes sense once you read above a couple of 195 * times and think about it from a hardware perspective. 196 */ 197 static u16 dlfb_lfsr16(u16 actual_count) 198 { 199 u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ 200 201 while (actual_count--) { 202 lv = ((lv << 1) | 203 (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) 204 & 0xFFFF; 205 } 206 207 return (u16) lv; 208 } 209 210 /* 211 * This does LFSR conversion on the value that is to be written. 212 * See LFSR explanation above for more detail. 213 */ 214 static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) 215 { 216 return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); 217 } 218 219 /* 220 * This takes a standard fbdev screeninfo struct and all of its monitor mode 221 * details and converts them into the DisplayLink equivalent register commands. 222 */ 223 static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) 224 { 225 u16 xds, yds; 226 u16 xde, yde; 227 u16 yec; 228 229 /* x display start */ 230 xds = var->left_margin + var->hsync_len; 231 wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); 232 /* x display end */ 233 xde = xds + var->xres; 234 wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); 235 236 /* y display start */ 237 yds = var->upper_margin + var->vsync_len; 238 wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); 239 /* y display end */ 240 yde = yds + var->yres; 241 wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); 242 243 /* x end count is active + blanking - 1 */ 244 wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, 245 xde + var->right_margin - 1); 246 247 /* libdlo hardcodes hsync start to 1 */ 248 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); 249 250 /* hsync end is width of sync pulse + 1 */ 251 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); 252 253 /* hpixels is active pixels */ 254 wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); 255 256 /* yendcount is vertical active + vertical blanking */ 257 yec = var->yres + var->upper_margin + var->lower_margin + 258 var->vsync_len; 259 wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); 260 261 /* libdlo hardcodes vsync start to 0 */ 262 wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); 263 264 /* vsync end is width of vsync pulse */ 265 wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); 266 267 /* vpixels is active pixels */ 268 wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); 269 270 /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ 271 wrptr = dlfb_set_register_16be(wrptr, 0x1B, 272 200*1000*1000/var->pixclock); 273 274 return wrptr; 275 } 276 277 /* 278 * This takes a standard fbdev screeninfo struct that was fetched or prepared 279 * and then generates the appropriate command sequence that then drives the 280 * display controller. 281 */ 282 static int dlfb_set_video_mode(struct dlfb_data *dlfb, 283 struct fb_var_screeninfo *var) 284 { 285 char *buf; 286 char *wrptr; 287 int retval; 288 int writesize; 289 struct urb *urb; 290 291 if (!atomic_read(&dlfb->usb_active)) 292 return -EPERM; 293 294 urb = dlfb_get_urb(dlfb); 295 if (!urb) 296 return -ENOMEM; 297 298 buf = (char *) urb->transfer_buffer; 299 300 /* 301 * This first section has to do with setting the base address on the 302 * controller * associated with the display. There are 2 base 303 * pointers, currently, we only * use the 16 bpp segment. 304 */ 305 wrptr = dlfb_vidreg_lock(buf); 306 wrptr = dlfb_set_color_depth(wrptr, 0x00); 307 /* set base for 16bpp segment to 0 */ 308 wrptr = dlfb_set_base16bpp(wrptr, 0); 309 /* set base for 8bpp segment to end of fb */ 310 wrptr = dlfb_set_base8bpp(wrptr, dlfb->info->fix.smem_len); 311 312 wrptr = dlfb_set_vid_cmds(wrptr, var); 313 wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); 314 wrptr = dlfb_vidreg_unlock(wrptr); 315 316 writesize = wrptr - buf; 317 318 retval = dlfb_submit_urb(dlfb, urb, writesize); 319 320 dlfb->blank_mode = FB_BLANK_UNBLANK; 321 322 return retval; 323 } 324 325 static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) 326 { 327 unsigned long start = vma->vm_start; 328 unsigned long size = vma->vm_end - vma->vm_start; 329 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 330 unsigned long page, pos; 331 332 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) 333 return -EINVAL; 334 if (size > info->fix.smem_len) 335 return -EINVAL; 336 if (offset > info->fix.smem_len - size) 337 return -EINVAL; 338 339 pos = (unsigned long)info->fix.smem_start + offset; 340 341 dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n", 342 pos, size); 343 344 while (size > 0) { 345 page = vmalloc_to_pfn((void *)pos); 346 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) 347 return -EAGAIN; 348 349 start += PAGE_SIZE; 350 pos += PAGE_SIZE; 351 if (size > PAGE_SIZE) 352 size -= PAGE_SIZE; 353 else 354 size = 0; 355 } 356 357 return 0; 358 } 359 360 /* 361 * Trims identical data from front and back of line 362 * Sets new front buffer address and width 363 * And returns byte count of identical pixels 364 * Assumes CPU natural alignment (unsigned long) 365 * for back and front buffer ptrs and width 366 */ 367 static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) 368 { 369 int j, k; 370 const unsigned long *back = (const unsigned long *) bback; 371 const unsigned long *front = (const unsigned long *) *bfront; 372 const int width = *width_bytes / sizeof(unsigned long); 373 int identical = width; 374 int start = width; 375 int end = width; 376 377 for (j = 0; j < width; j++) { 378 if (back[j] != front[j]) { 379 start = j; 380 break; 381 } 382 } 383 384 for (k = width - 1; k > j; k--) { 385 if (back[k] != front[k]) { 386 end = k+1; 387 break; 388 } 389 } 390 391 identical = start + (width - end); 392 *bfront = (u8 *) &front[start]; 393 *width_bytes = (end - start) * sizeof(unsigned long); 394 395 return identical * sizeof(unsigned long); 396 } 397 398 /* 399 * Render a command stream for an encoded horizontal line segment of pixels. 400 * 401 * A command buffer holds several commands. 402 * It always begins with a fresh command header 403 * (the protocol doesn't require this, but we enforce it to allow 404 * multiple buffers to be potentially encoded and sent in parallel). 405 * A single command encodes one contiguous horizontal line of pixels 406 * 407 * The function relies on the client to do all allocation, so that 408 * rendering can be done directly to output buffers (e.g. USB URBs). 409 * The function fills the supplied command buffer, providing information 410 * on where it left off, so the client may call in again with additional 411 * buffers if the line will take several buffers to complete. 412 * 413 * A single command can transmit a maximum of 256 pixels, 414 * regardless of the compression ratio (protocol design limit). 415 * To the hardware, 0 for a size byte means 256 416 * 417 * Rather than 256 pixel commands which are either rl or raw encoded, 418 * the rlx command simply assumes alternating raw and rl spans within one cmd. 419 * This has a slightly larger header overhead, but produces more even results. 420 * It also processes all data (read and write) in a single pass. 421 * Performance benchmarks of common cases show it having just slightly better 422 * compression than 256 pixel raw or rle commands, with similar CPU consumpion. 423 * But for very rl friendly data, will compress not quite as well. 424 */ 425 static void dlfb_compress_hline( 426 const uint16_t **pixel_start_ptr, 427 const uint16_t *const pixel_end, 428 uint32_t *device_address_ptr, 429 uint8_t **command_buffer_ptr, 430 const uint8_t *const cmd_buffer_end, 431 unsigned long back_buffer_offset, 432 int *ident_ptr) 433 { 434 const uint16_t *pixel = *pixel_start_ptr; 435 uint32_t dev_addr = *device_address_ptr; 436 uint8_t *cmd = *command_buffer_ptr; 437 438 while ((pixel_end > pixel) && 439 (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { 440 uint8_t *raw_pixels_count_byte = NULL; 441 uint8_t *cmd_pixels_count_byte = NULL; 442 const uint16_t *raw_pixel_start = NULL; 443 const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL; 444 445 if (back_buffer_offset && 446 *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) { 447 pixel++; 448 dev_addr += BPP; 449 (*ident_ptr)++; 450 continue; 451 } 452 453 *cmd++ = 0xAF; 454 *cmd++ = 0x6B; 455 *cmd++ = dev_addr >> 16; 456 *cmd++ = dev_addr >> 8; 457 *cmd++ = dev_addr; 458 459 cmd_pixels_count_byte = cmd++; /* we'll know this later */ 460 cmd_pixel_start = pixel; 461 462 raw_pixels_count_byte = cmd++; /* we'll know this later */ 463 raw_pixel_start = pixel; 464 465 cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL, 466 (unsigned long)(pixel_end - pixel), 467 (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP); 468 469 if (back_buffer_offset) { 470 /* note: the framebuffer may change under us, so we must test for underflow */ 471 while (cmd_pixel_end - 1 > pixel && 472 *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset)) 473 cmd_pixel_end--; 474 } 475 476 while (pixel < cmd_pixel_end) { 477 const uint16_t * const repeating_pixel = pixel; 478 u16 pixel_value = *pixel; 479 480 put_unaligned_be16(pixel_value, cmd); 481 if (back_buffer_offset) 482 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; 483 cmd += 2; 484 pixel++; 485 486 if (unlikely((pixel < cmd_pixel_end) && 487 (*pixel == pixel_value))) { 488 /* go back and fill in raw pixel count */ 489 *raw_pixels_count_byte = ((repeating_pixel - 490 raw_pixel_start) + 1) & 0xFF; 491 492 do { 493 if (back_buffer_offset) 494 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; 495 pixel++; 496 } while ((pixel < cmd_pixel_end) && 497 (*pixel == pixel_value)); 498 499 /* immediately after raw data is repeat byte */ 500 *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; 501 502 /* Then start another raw pixel span */ 503 raw_pixel_start = pixel; 504 raw_pixels_count_byte = cmd++; 505 } 506 } 507 508 if (pixel > raw_pixel_start) { 509 /* finalize last RAW span */ 510 *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; 511 } else { 512 /* undo unused byte */ 513 cmd--; 514 } 515 516 *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; 517 dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start; 518 } 519 520 if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) { 521 /* Fill leftover bytes with no-ops */ 522 if (cmd_buffer_end > cmd) 523 memset(cmd, 0xAF, cmd_buffer_end - cmd); 524 cmd = (uint8_t *) cmd_buffer_end; 525 } 526 527 *command_buffer_ptr = cmd; 528 *pixel_start_ptr = pixel; 529 *device_address_ptr = dev_addr; 530 } 531 532 /* 533 * There are 3 copies of every pixel: The front buffer that the fbdev 534 * client renders to, the actual framebuffer across the USB bus in hardware 535 * (that we can only write to, slowly, and can never read), and (optionally) 536 * our shadow copy that tracks what's been sent to that hardware buffer. 537 */ 538 static int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr, 539 const char *front, char **urb_buf_ptr, 540 u32 byte_offset, u32 byte_width, 541 int *ident_ptr, int *sent_ptr) 542 { 543 const u8 *line_start, *line_end, *next_pixel; 544 u32 dev_addr = dlfb->base16 + byte_offset; 545 struct urb *urb = *urb_ptr; 546 u8 *cmd = *urb_buf_ptr; 547 u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; 548 unsigned long back_buffer_offset = 0; 549 550 line_start = (u8 *) (front + byte_offset); 551 next_pixel = line_start; 552 line_end = next_pixel + byte_width; 553 554 if (dlfb->backing_buffer) { 555 int offset; 556 const u8 *back_start = (u8 *) (dlfb->backing_buffer 557 + byte_offset); 558 559 back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start; 560 561 *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, 562 &byte_width); 563 564 offset = next_pixel - line_start; 565 line_end = next_pixel + byte_width; 566 dev_addr += offset; 567 back_start += offset; 568 line_start += offset; 569 } 570 571 while (next_pixel < line_end) { 572 573 dlfb_compress_hline((const uint16_t **) &next_pixel, 574 (const uint16_t *) line_end, &dev_addr, 575 (u8 **) &cmd, (u8 *) cmd_end, back_buffer_offset, 576 ident_ptr); 577 578 if (cmd >= cmd_end) { 579 int len = cmd - (u8 *) urb->transfer_buffer; 580 if (dlfb_submit_urb(dlfb, urb, len)) 581 return 1; /* lost pixels is set */ 582 *sent_ptr += len; 583 urb = dlfb_get_urb(dlfb); 584 if (!urb) 585 return 1; /* lost_pixels is set */ 586 *urb_ptr = urb; 587 cmd = urb->transfer_buffer; 588 cmd_end = &cmd[urb->transfer_buffer_length]; 589 } 590 } 591 592 *urb_buf_ptr = cmd; 593 594 return 0; 595 } 596 597 static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, 598 int width, int height, char *data) 599 { 600 int i, ret; 601 char *cmd; 602 cycles_t start_cycles, end_cycles; 603 int bytes_sent = 0; 604 int bytes_identical = 0; 605 struct urb *urb; 606 int aligned_x; 607 608 start_cycles = get_cycles(); 609 610 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); 611 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); 612 x = aligned_x; 613 614 if ((width <= 0) || 615 (x + width > dlfb->info->var.xres) || 616 (y + height > dlfb->info->var.yres)) 617 return -EINVAL; 618 619 if (!atomic_read(&dlfb->usb_active)) 620 return 0; 621 622 urb = dlfb_get_urb(dlfb); 623 if (!urb) 624 return 0; 625 cmd = urb->transfer_buffer; 626 627 for (i = y; i < y + height ; i++) { 628 const int line_offset = dlfb->info->fix.line_length * i; 629 const int byte_offset = line_offset + (x * BPP); 630 631 if (dlfb_render_hline(dlfb, &urb, 632 (char *) dlfb->info->fix.smem_start, 633 &cmd, byte_offset, width * BPP, 634 &bytes_identical, &bytes_sent)) 635 goto error; 636 } 637 638 if (cmd > (char *) urb->transfer_buffer) { 639 int len; 640 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) 641 *cmd++ = 0xAF; 642 /* Send partial buffer remaining before exiting */ 643 len = cmd - (char *) urb->transfer_buffer; 644 ret = dlfb_submit_urb(dlfb, urb, len); 645 bytes_sent += len; 646 } else 647 dlfb_urb_completion(urb); 648 649 error: 650 atomic_add(bytes_sent, &dlfb->bytes_sent); 651 atomic_add(bytes_identical, &dlfb->bytes_identical); 652 atomic_add(width*height*2, &dlfb->bytes_rendered); 653 end_cycles = get_cycles(); 654 atomic_add(((unsigned int) ((end_cycles - start_cycles) 655 >> 10)), /* Kcycles */ 656 &dlfb->cpu_kcycles_used); 657 658 return 0; 659 } 660 661 /* 662 * Path triggered by usermode clients who write to filesystem 663 * e.g. cat filename > /dev/fb1 664 * Not used by X Windows or text-mode console. But useful for testing. 665 * Slow because of extra copy and we must assume all pixels dirty. 666 */ 667 static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, 668 size_t count, loff_t *ppos) 669 { 670 ssize_t result; 671 struct dlfb_data *dlfb = info->par; 672 u32 offset = (u32) *ppos; 673 674 result = fb_sys_write(info, buf, count, ppos); 675 676 if (result > 0) { 677 int start = max((int)(offset / info->fix.line_length), 0); 678 int lines = min((u32)((result / info->fix.line_length) + 1), 679 (u32)info->var.yres); 680 681 dlfb_handle_damage(dlfb, 0, start, info->var.xres, 682 lines, info->screen_base); 683 } 684 685 return result; 686 } 687 688 /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ 689 static void dlfb_ops_copyarea(struct fb_info *info, 690 const struct fb_copyarea *area) 691 { 692 693 struct dlfb_data *dlfb = info->par; 694 695 sys_copyarea(info, area); 696 697 dlfb_handle_damage(dlfb, area->dx, area->dy, 698 area->width, area->height, info->screen_base); 699 } 700 701 static void dlfb_ops_imageblit(struct fb_info *info, 702 const struct fb_image *image) 703 { 704 struct dlfb_data *dlfb = info->par; 705 706 sys_imageblit(info, image); 707 708 dlfb_handle_damage(dlfb, image->dx, image->dy, 709 image->width, image->height, info->screen_base); 710 } 711 712 static void dlfb_ops_fillrect(struct fb_info *info, 713 const struct fb_fillrect *rect) 714 { 715 struct dlfb_data *dlfb = info->par; 716 717 sys_fillrect(info, rect); 718 719 dlfb_handle_damage(dlfb, rect->dx, rect->dy, rect->width, 720 rect->height, info->screen_base); 721 } 722 723 /* 724 * NOTE: fb_defio.c is holding info->fbdefio.mutex 725 * Touching ANY framebuffer memory that triggers a page fault 726 * in fb_defio will cause a deadlock, when it also tries to 727 * grab the same mutex. 728 */ 729 static void dlfb_dpy_deferred_io(struct fb_info *info, 730 struct list_head *pagelist) 731 { 732 struct page *cur; 733 struct fb_deferred_io *fbdefio = info->fbdefio; 734 struct dlfb_data *dlfb = info->par; 735 struct urb *urb; 736 char *cmd; 737 cycles_t start_cycles, end_cycles; 738 int bytes_sent = 0; 739 int bytes_identical = 0; 740 int bytes_rendered = 0; 741 742 if (!fb_defio) 743 return; 744 745 if (!atomic_read(&dlfb->usb_active)) 746 return; 747 748 start_cycles = get_cycles(); 749 750 urb = dlfb_get_urb(dlfb); 751 if (!urb) 752 return; 753 754 cmd = urb->transfer_buffer; 755 756 /* walk the written page list and render each to device */ 757 list_for_each_entry(cur, &fbdefio->pagelist, lru) { 758 759 if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start, 760 &cmd, cur->index << PAGE_SHIFT, 761 PAGE_SIZE, &bytes_identical, &bytes_sent)) 762 goto error; 763 bytes_rendered += PAGE_SIZE; 764 } 765 766 if (cmd > (char *) urb->transfer_buffer) { 767 int len; 768 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) 769 *cmd++ = 0xAF; 770 /* Send partial buffer remaining before exiting */ 771 len = cmd - (char *) urb->transfer_buffer; 772 dlfb_submit_urb(dlfb, urb, len); 773 bytes_sent += len; 774 } else 775 dlfb_urb_completion(urb); 776 777 error: 778 atomic_add(bytes_sent, &dlfb->bytes_sent); 779 atomic_add(bytes_identical, &dlfb->bytes_identical); 780 atomic_add(bytes_rendered, &dlfb->bytes_rendered); 781 end_cycles = get_cycles(); 782 atomic_add(((unsigned int) ((end_cycles - start_cycles) 783 >> 10)), /* Kcycles */ 784 &dlfb->cpu_kcycles_used); 785 } 786 787 static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len) 788 { 789 int i, ret; 790 char *rbuf; 791 792 rbuf = kmalloc(2, GFP_KERNEL); 793 if (!rbuf) 794 return 0; 795 796 for (i = 0; i < len; i++) { 797 ret = usb_control_msg(dlfb->udev, 798 usb_rcvctrlpipe(dlfb->udev, 0), 0x02, 799 (0x80 | (0x02 << 5)), i << 8, 0xA1, 800 rbuf, 2, USB_CTRL_GET_TIMEOUT); 801 if (ret < 2) { 802 dev_err(&dlfb->udev->dev, 803 "Read EDID byte %d failed: %d\n", i, ret); 804 i--; 805 break; 806 } 807 edid[i] = rbuf[1]; 808 } 809 810 kfree(rbuf); 811 812 return i; 813 } 814 815 static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, 816 unsigned long arg) 817 { 818 819 struct dlfb_data *dlfb = info->par; 820 821 if (!atomic_read(&dlfb->usb_active)) 822 return 0; 823 824 /* TODO: Update X server to get this from sysfs instead */ 825 if (cmd == DLFB_IOCTL_RETURN_EDID) { 826 void __user *edid = (void __user *)arg; 827 if (copy_to_user(edid, dlfb->edid, dlfb->edid_size)) 828 return -EFAULT; 829 return 0; 830 } 831 832 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ 833 if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { 834 struct dloarea area; 835 836 if (copy_from_user(&area, (void __user *)arg, 837 sizeof(struct dloarea))) 838 return -EFAULT; 839 840 /* 841 * If we have a damage-aware client, turn fb_defio "off" 842 * To avoid perf imact of unnecessary page fault handling. 843 * Done by resetting the delay for this fb_info to a very 844 * long period. Pages will become writable and stay that way. 845 * Reset to normal value when all clients have closed this fb. 846 */ 847 if (info->fbdefio) 848 info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; 849 850 if (area.x < 0) 851 area.x = 0; 852 853 if (area.x > info->var.xres) 854 area.x = info->var.xres; 855 856 if (area.y < 0) 857 area.y = 0; 858 859 if (area.y > info->var.yres) 860 area.y = info->var.yres; 861 862 dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h, 863 info->screen_base); 864 } 865 866 return 0; 867 } 868 869 /* taken from vesafb */ 870 static int 871 dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, 872 unsigned blue, unsigned transp, struct fb_info *info) 873 { 874 int err = 0; 875 876 if (regno >= info->cmap.len) 877 return 1; 878 879 if (regno < 16) { 880 if (info->var.red.offset == 10) { 881 /* 1:5:5:5 */ 882 ((u32 *) (info->pseudo_palette))[regno] = 883 ((red & 0xf800) >> 1) | 884 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); 885 } else { 886 /* 0:5:6:5 */ 887 ((u32 *) (info->pseudo_palette))[regno] = 888 ((red & 0xf800)) | 889 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); 890 } 891 } 892 893 return err; 894 } 895 896 /* 897 * It's common for several clients to have framebuffer open simultaneously. 898 * e.g. both fbcon and X. Makes things interesting. 899 * Assumes caller is holding info->lock (for open and release at least) 900 */ 901 static int dlfb_ops_open(struct fb_info *info, int user) 902 { 903 struct dlfb_data *dlfb = info->par; 904 905 /* 906 * fbcon aggressively connects to first framebuffer it finds, 907 * preventing other clients (X) from working properly. Usually 908 * not what the user wants. Fail by default with option to enable. 909 */ 910 if ((user == 0) && (!console)) 911 return -EBUSY; 912 913 /* If the USB device is gone, we don't accept new opens */ 914 if (dlfb->virtualized) 915 return -ENODEV; 916 917 dlfb->fb_count++; 918 919 if (fb_defio && (info->fbdefio == NULL)) { 920 /* enable defio at last moment if not disabled by client */ 921 922 struct fb_deferred_io *fbdefio; 923 924 fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); 925 926 if (fbdefio) { 927 fbdefio->delay = DL_DEFIO_WRITE_DELAY; 928 fbdefio->deferred_io = dlfb_dpy_deferred_io; 929 } 930 931 info->fbdefio = fbdefio; 932 fb_deferred_io_init(info); 933 } 934 935 dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n", 936 user, info, dlfb->fb_count); 937 938 return 0; 939 } 940 941 static void dlfb_ops_destroy(struct fb_info *info) 942 { 943 struct dlfb_data *dlfb = info->par; 944 945 if (info->cmap.len != 0) 946 fb_dealloc_cmap(&info->cmap); 947 if (info->monspecs.modedb) 948 fb_destroy_modedb(info->monspecs.modedb); 949 vfree(info->screen_base); 950 951 fb_destroy_modelist(&info->modelist); 952 953 while (!list_empty(&dlfb->deferred_free)) { 954 struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list); 955 list_del(&d->list); 956 vfree(d->mem); 957 kfree(d); 958 } 959 vfree(dlfb->backing_buffer); 960 kfree(dlfb->edid); 961 usb_put_dev(dlfb->udev); 962 kfree(dlfb); 963 964 /* Assume info structure is freed after this point */ 965 framebuffer_release(info); 966 } 967 968 /* 969 * Assumes caller is holding info->lock mutex (for open and release at least) 970 */ 971 static int dlfb_ops_release(struct fb_info *info, int user) 972 { 973 struct dlfb_data *dlfb = info->par; 974 975 dlfb->fb_count--; 976 977 if ((dlfb->fb_count == 0) && (info->fbdefio)) { 978 fb_deferred_io_cleanup(info); 979 kfree(info->fbdefio); 980 info->fbdefio = NULL; 981 info->fbops->fb_mmap = dlfb_ops_mmap; 982 } 983 984 dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count); 985 986 return 0; 987 } 988 989 /* 990 * Check whether a video mode is supported by the DisplayLink chip 991 * We start from monitor's modes, so don't need to filter that here 992 */ 993 static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb) 994 { 995 if (mode->xres * mode->yres > dlfb->sku_pixel_limit) 996 return 0; 997 998 return 1; 999 } 1000 1001 static void dlfb_var_color_format(struct fb_var_screeninfo *var) 1002 { 1003 const struct fb_bitfield red = { 11, 5, 0 }; 1004 const struct fb_bitfield green = { 5, 6, 0 }; 1005 const struct fb_bitfield blue = { 0, 5, 0 }; 1006 1007 var->bits_per_pixel = 16; 1008 var->red = red; 1009 var->green = green; 1010 var->blue = blue; 1011 } 1012 1013 static int dlfb_ops_check_var(struct fb_var_screeninfo *var, 1014 struct fb_info *info) 1015 { 1016 struct fb_videomode mode; 1017 struct dlfb_data *dlfb = info->par; 1018 1019 /* set device-specific elements of var unrelated to mode */ 1020 dlfb_var_color_format(var); 1021 1022 fb_var_to_videomode(&mode, var); 1023 1024 if (!dlfb_is_valid_mode(&mode, dlfb)) 1025 return -EINVAL; 1026 1027 return 0; 1028 } 1029 1030 static int dlfb_ops_set_par(struct fb_info *info) 1031 { 1032 struct dlfb_data *dlfb = info->par; 1033 int result; 1034 u16 *pix_framebuffer; 1035 int i; 1036 struct fb_var_screeninfo fvs; 1037 u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8); 1038 1039 /* clear the activate field because it causes spurious miscompares */ 1040 fvs = info->var; 1041 fvs.activate = 0; 1042 fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN; 1043 1044 if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo))) 1045 return 0; 1046 1047 result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length); 1048 if (result) 1049 return result; 1050 1051 result = dlfb_set_video_mode(dlfb, &info->var); 1052 1053 if (result) 1054 return result; 1055 1056 dlfb->current_mode = fvs; 1057 info->fix.line_length = line_length; 1058 1059 if (dlfb->fb_count == 0) { 1060 1061 /* paint greenscreen */ 1062 1063 pix_framebuffer = (u16 *) info->screen_base; 1064 for (i = 0; i < info->fix.smem_len / 2; i++) 1065 pix_framebuffer[i] = 0x37e6; 1066 } 1067 1068 dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres, 1069 info->screen_base); 1070 1071 return 0; 1072 } 1073 1074 /* To fonzi the jukebox (e.g. make blanking changes take effect) */ 1075 static char *dlfb_dummy_render(char *buf) 1076 { 1077 *buf++ = 0xAF; 1078 *buf++ = 0x6A; /* copy */ 1079 *buf++ = 0x00; /* from address*/ 1080 *buf++ = 0x00; 1081 *buf++ = 0x00; 1082 *buf++ = 0x01; /* one pixel */ 1083 *buf++ = 0x00; /* to address */ 1084 *buf++ = 0x00; 1085 *buf++ = 0x00; 1086 return buf; 1087 } 1088 1089 /* 1090 * In order to come back from full DPMS off, we need to set the mode again 1091 */ 1092 static int dlfb_ops_blank(int blank_mode, struct fb_info *info) 1093 { 1094 struct dlfb_data *dlfb = info->par; 1095 char *bufptr; 1096 struct urb *urb; 1097 1098 dev_dbg(info->dev, "blank, mode %d --> %d\n", 1099 dlfb->blank_mode, blank_mode); 1100 1101 if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) && 1102 (blank_mode != FB_BLANK_POWERDOWN)) { 1103 1104 /* returning from powerdown requires a fresh modeset */ 1105 dlfb_set_video_mode(dlfb, &info->var); 1106 } 1107 1108 urb = dlfb_get_urb(dlfb); 1109 if (!urb) 1110 return 0; 1111 1112 bufptr = (char *) urb->transfer_buffer; 1113 bufptr = dlfb_vidreg_lock(bufptr); 1114 bufptr = dlfb_blanking(bufptr, blank_mode); 1115 bufptr = dlfb_vidreg_unlock(bufptr); 1116 1117 /* seems like a render op is needed to have blank change take effect */ 1118 bufptr = dlfb_dummy_render(bufptr); 1119 1120 dlfb_submit_urb(dlfb, urb, bufptr - 1121 (char *) urb->transfer_buffer); 1122 1123 dlfb->blank_mode = blank_mode; 1124 1125 return 0; 1126 } 1127 1128 static struct fb_ops dlfb_ops = { 1129 .owner = THIS_MODULE, 1130 .fb_read = fb_sys_read, 1131 .fb_write = dlfb_ops_write, 1132 .fb_setcolreg = dlfb_ops_setcolreg, 1133 .fb_fillrect = dlfb_ops_fillrect, 1134 .fb_copyarea = dlfb_ops_copyarea, 1135 .fb_imageblit = dlfb_ops_imageblit, 1136 .fb_mmap = dlfb_ops_mmap, 1137 .fb_ioctl = dlfb_ops_ioctl, 1138 .fb_open = dlfb_ops_open, 1139 .fb_release = dlfb_ops_release, 1140 .fb_blank = dlfb_ops_blank, 1141 .fb_check_var = dlfb_ops_check_var, 1142 .fb_set_par = dlfb_ops_set_par, 1143 .fb_destroy = dlfb_ops_destroy, 1144 }; 1145 1146 1147 static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem) 1148 { 1149 struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL); 1150 if (!d) 1151 return; 1152 d->mem = mem; 1153 list_add(&d->list, &dlfb->deferred_free); 1154 } 1155 1156 /* 1157 * Assumes &info->lock held by caller 1158 * Assumes no active clients have framebuffer open 1159 */ 1160 static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len) 1161 { 1162 u32 old_len = info->fix.smem_len; 1163 const void *old_fb = (const void __force *)info->screen_base; 1164 unsigned char *new_fb; 1165 unsigned char *new_back = NULL; 1166 1167 new_len = PAGE_ALIGN(new_len); 1168 1169 if (new_len > old_len) { 1170 /* 1171 * Alloc system memory for virtual framebuffer 1172 */ 1173 new_fb = vmalloc(new_len); 1174 if (!new_fb) { 1175 dev_err(info->dev, "Virtual framebuffer alloc failed\n"); 1176 return -ENOMEM; 1177 } 1178 memset(new_fb, 0xff, new_len); 1179 1180 if (info->screen_base) { 1181 memcpy(new_fb, old_fb, old_len); 1182 dlfb_deferred_vfree(dlfb, (void __force *)info->screen_base); 1183 } 1184 1185 info->screen_base = (char __iomem *)new_fb; 1186 info->fix.smem_len = new_len; 1187 info->fix.smem_start = (unsigned long) new_fb; 1188 info->flags = udlfb_info_flags; 1189 1190 /* 1191 * Second framebuffer copy to mirror the framebuffer state 1192 * on the physical USB device. We can function without this. 1193 * But with imperfect damage info we may send pixels over USB 1194 * that were, in fact, unchanged - wasting limited USB bandwidth 1195 */ 1196 if (shadow) 1197 new_back = vzalloc(new_len); 1198 if (!new_back) 1199 dev_info(info->dev, 1200 "No shadow/backing buffer allocated\n"); 1201 else { 1202 dlfb_deferred_vfree(dlfb, dlfb->backing_buffer); 1203 dlfb->backing_buffer = new_back; 1204 } 1205 } 1206 return 0; 1207 } 1208 1209 /* 1210 * 1) Get EDID from hw, or use sw default 1211 * 2) Parse into various fb_info structs 1212 * 3) Allocate virtual framebuffer memory to back highest res mode 1213 * 1214 * Parses EDID into three places used by various parts of fbdev: 1215 * fb_var_screeninfo contains the timing of the monitor's preferred mode 1216 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb 1217 * fb_info.modelist is a linked list of all monitor & VESA modes which work 1218 * 1219 * If EDID is not readable/valid, then modelist is all VESA modes, 1220 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode 1221 * Returns 0 if successful 1222 */ 1223 static int dlfb_setup_modes(struct dlfb_data *dlfb, 1224 struct fb_info *info, 1225 char *default_edid, size_t default_edid_size) 1226 { 1227 char *edid; 1228 int i, result = 0, tries = 3; 1229 struct device *dev = info->device; 1230 struct fb_videomode *mode; 1231 const struct fb_videomode *default_vmode = NULL; 1232 1233 if (info->dev) { 1234 /* only use mutex if info has been registered */ 1235 mutex_lock(&info->lock); 1236 /* parent device is used otherwise */ 1237 dev = info->dev; 1238 } 1239 1240 edid = kmalloc(EDID_LENGTH, GFP_KERNEL); 1241 if (!edid) { 1242 result = -ENOMEM; 1243 goto error; 1244 } 1245 1246 fb_destroy_modelist(&info->modelist); 1247 memset(&info->monspecs, 0, sizeof(info->monspecs)); 1248 1249 /* 1250 * Try to (re)read EDID from hardware first 1251 * EDID data may return, but not parse as valid 1252 * Try again a few times, in case of e.g. analog cable noise 1253 */ 1254 while (tries--) { 1255 1256 i = dlfb_get_edid(dlfb, edid, EDID_LENGTH); 1257 1258 if (i >= EDID_LENGTH) 1259 fb_edid_to_monspecs(edid, &info->monspecs); 1260 1261 if (info->monspecs.modedb_len > 0) { 1262 dlfb->edid = edid; 1263 dlfb->edid_size = i; 1264 break; 1265 } 1266 } 1267 1268 /* If that fails, use a previously returned EDID if available */ 1269 if (info->monspecs.modedb_len == 0) { 1270 dev_err(dev, "Unable to get valid EDID from device/display\n"); 1271 1272 if (dlfb->edid) { 1273 fb_edid_to_monspecs(dlfb->edid, &info->monspecs); 1274 if (info->monspecs.modedb_len > 0) 1275 dev_err(dev, "Using previously queried EDID\n"); 1276 } 1277 } 1278 1279 /* If that fails, use the default EDID we were handed */ 1280 if (info->monspecs.modedb_len == 0) { 1281 if (default_edid_size >= EDID_LENGTH) { 1282 fb_edid_to_monspecs(default_edid, &info->monspecs); 1283 if (info->monspecs.modedb_len > 0) { 1284 memcpy(edid, default_edid, default_edid_size); 1285 dlfb->edid = edid; 1286 dlfb->edid_size = default_edid_size; 1287 dev_err(dev, "Using default/backup EDID\n"); 1288 } 1289 } 1290 } 1291 1292 /* If we've got modes, let's pick a best default mode */ 1293 if (info->monspecs.modedb_len > 0) { 1294 1295 for (i = 0; i < info->monspecs.modedb_len; i++) { 1296 mode = &info->monspecs.modedb[i]; 1297 if (dlfb_is_valid_mode(mode, dlfb)) { 1298 fb_add_videomode(mode, &info->modelist); 1299 } else { 1300 dev_dbg(dev, "Specified mode %dx%d too big\n", 1301 mode->xres, mode->yres); 1302 if (i == 0) 1303 /* if we've removed top/best mode */ 1304 info->monspecs.misc 1305 &= ~FB_MISC_1ST_DETAIL; 1306 } 1307 } 1308 1309 default_vmode = fb_find_best_display(&info->monspecs, 1310 &info->modelist); 1311 } 1312 1313 /* If everything else has failed, fall back to safe default mode */ 1314 if (default_vmode == NULL) { 1315 1316 struct fb_videomode fb_vmode = {0}; 1317 1318 /* 1319 * Add the standard VESA modes to our modelist 1320 * Since we don't have EDID, there may be modes that 1321 * overspec monitor and/or are incorrect aspect ratio, etc. 1322 * But at least the user has a chance to choose 1323 */ 1324 for (i = 0; i < VESA_MODEDB_SIZE; i++) { 1325 mode = (struct fb_videomode *)&vesa_modes[i]; 1326 if (dlfb_is_valid_mode(mode, dlfb)) 1327 fb_add_videomode(mode, &info->modelist); 1328 else 1329 dev_dbg(dev, "VESA mode %dx%d too big\n", 1330 mode->xres, mode->yres); 1331 } 1332 1333 /* 1334 * default to resolution safe for projectors 1335 * (since they are most common case without EDID) 1336 */ 1337 fb_vmode.xres = 800; 1338 fb_vmode.yres = 600; 1339 fb_vmode.refresh = 60; 1340 default_vmode = fb_find_nearest_mode(&fb_vmode, 1341 &info->modelist); 1342 } 1343 1344 /* If we have good mode and no active clients*/ 1345 if ((default_vmode != NULL) && (dlfb->fb_count == 0)) { 1346 1347 fb_videomode_to_var(&info->var, default_vmode); 1348 dlfb_var_color_format(&info->var); 1349 1350 /* 1351 * with mode size info, we can now alloc our framebuffer. 1352 */ 1353 memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); 1354 } else 1355 result = -EINVAL; 1356 1357 error: 1358 if (edid && (dlfb->edid != edid)) 1359 kfree(edid); 1360 1361 if (info->dev) 1362 mutex_unlock(&info->lock); 1363 1364 return result; 1365 } 1366 1367 static ssize_t metrics_bytes_rendered_show(struct device *fbdev, 1368 struct device_attribute *a, char *buf) { 1369 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1370 struct dlfb_data *dlfb = fb_info->par; 1371 return snprintf(buf, PAGE_SIZE, "%u\n", 1372 atomic_read(&dlfb->bytes_rendered)); 1373 } 1374 1375 static ssize_t metrics_bytes_identical_show(struct device *fbdev, 1376 struct device_attribute *a, char *buf) { 1377 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1378 struct dlfb_data *dlfb = fb_info->par; 1379 return snprintf(buf, PAGE_SIZE, "%u\n", 1380 atomic_read(&dlfb->bytes_identical)); 1381 } 1382 1383 static ssize_t metrics_bytes_sent_show(struct device *fbdev, 1384 struct device_attribute *a, char *buf) { 1385 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1386 struct dlfb_data *dlfb = fb_info->par; 1387 return snprintf(buf, PAGE_SIZE, "%u\n", 1388 atomic_read(&dlfb->bytes_sent)); 1389 } 1390 1391 static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, 1392 struct device_attribute *a, char *buf) { 1393 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1394 struct dlfb_data *dlfb = fb_info->par; 1395 return snprintf(buf, PAGE_SIZE, "%u\n", 1396 atomic_read(&dlfb->cpu_kcycles_used)); 1397 } 1398 1399 static ssize_t edid_show( 1400 struct file *filp, 1401 struct kobject *kobj, struct bin_attribute *a, 1402 char *buf, loff_t off, size_t count) { 1403 struct device *fbdev = container_of(kobj, struct device, kobj); 1404 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1405 struct dlfb_data *dlfb = fb_info->par; 1406 1407 if (dlfb->edid == NULL) 1408 return 0; 1409 1410 if ((off >= dlfb->edid_size) || (count > dlfb->edid_size)) 1411 return 0; 1412 1413 if (off + count > dlfb->edid_size) 1414 count = dlfb->edid_size - off; 1415 1416 memcpy(buf, dlfb->edid, count); 1417 1418 return count; 1419 } 1420 1421 static ssize_t edid_store( 1422 struct file *filp, 1423 struct kobject *kobj, struct bin_attribute *a, 1424 char *src, loff_t src_off, size_t src_size) { 1425 struct device *fbdev = container_of(kobj, struct device, kobj); 1426 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1427 struct dlfb_data *dlfb = fb_info->par; 1428 int ret; 1429 1430 /* We only support write of entire EDID at once, no offset*/ 1431 if ((src_size != EDID_LENGTH) || (src_off != 0)) 1432 return -EINVAL; 1433 1434 ret = dlfb_setup_modes(dlfb, fb_info, src, src_size); 1435 if (ret) 1436 return ret; 1437 1438 if (!dlfb->edid || memcmp(src, dlfb->edid, src_size)) 1439 return -EINVAL; 1440 1441 ret = dlfb_ops_set_par(fb_info); 1442 if (ret) 1443 return ret; 1444 1445 return src_size; 1446 } 1447 1448 static ssize_t metrics_reset_store(struct device *fbdev, 1449 struct device_attribute *attr, 1450 const char *buf, size_t count) 1451 { 1452 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1453 struct dlfb_data *dlfb = fb_info->par; 1454 1455 atomic_set(&dlfb->bytes_rendered, 0); 1456 atomic_set(&dlfb->bytes_identical, 0); 1457 atomic_set(&dlfb->bytes_sent, 0); 1458 atomic_set(&dlfb->cpu_kcycles_used, 0); 1459 1460 return count; 1461 } 1462 1463 static const struct bin_attribute edid_attr = { 1464 .attr.name = "edid", 1465 .attr.mode = 0666, 1466 .size = EDID_LENGTH, 1467 .read = edid_show, 1468 .write = edid_store 1469 }; 1470 1471 static const struct device_attribute fb_device_attrs[] = { 1472 __ATTR_RO(metrics_bytes_rendered), 1473 __ATTR_RO(metrics_bytes_identical), 1474 __ATTR_RO(metrics_bytes_sent), 1475 __ATTR_RO(metrics_cpu_kcycles_used), 1476 __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), 1477 }; 1478 1479 /* 1480 * This is necessary before we can communicate with the display controller. 1481 */ 1482 static int dlfb_select_std_channel(struct dlfb_data *dlfb) 1483 { 1484 int ret; 1485 void *buf; 1486 static const u8 set_def_chn[] = { 1487 0x57, 0xCD, 0xDC, 0xA7, 1488 0x1C, 0x88, 0x5E, 0x15, 1489 0x60, 0xFE, 0xC6, 0x97, 1490 0x16, 0x3D, 0x47, 0xF2 }; 1491 1492 buf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL); 1493 1494 if (!buf) 1495 return -ENOMEM; 1496 1497 ret = usb_control_msg(dlfb->udev, usb_sndctrlpipe(dlfb->udev, 0), 1498 NR_USB_REQUEST_CHANNEL, 1499 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, 1500 buf, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); 1501 1502 kfree(buf); 1503 1504 return ret; 1505 } 1506 1507 static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb, 1508 struct usb_interface *intf) 1509 { 1510 char *desc; 1511 char *buf; 1512 char *desc_end; 1513 int total_len; 1514 1515 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); 1516 if (!buf) 1517 return false; 1518 desc = buf; 1519 1520 total_len = usb_get_descriptor(interface_to_usbdev(intf), 1521 0x5f, /* vendor specific */ 1522 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); 1523 1524 /* if not found, look in configuration descriptor */ 1525 if (total_len < 0) { 1526 if (0 == usb_get_extra_descriptor(intf->cur_altsetting, 1527 0x5f, &desc)) 1528 total_len = (int) desc[0]; 1529 } 1530 1531 if (total_len > 5) { 1532 dev_info(&intf->dev, 1533 "vendor descriptor length: %d data: %11ph\n", 1534 total_len, desc); 1535 1536 if ((desc[0] != total_len) || /* descriptor length */ 1537 (desc[1] != 0x5f) || /* vendor descriptor type */ 1538 (desc[2] != 0x01) || /* version (2 bytes) */ 1539 (desc[3] != 0x00) || 1540 (desc[4] != total_len - 2)) /* length after type */ 1541 goto unrecognized; 1542 1543 desc_end = desc + total_len; 1544 desc += 5; /* the fixed header we've already parsed */ 1545 1546 while (desc < desc_end) { 1547 u8 length; 1548 u16 key; 1549 1550 key = *desc++; 1551 key |= (u16)*desc++ << 8; 1552 length = *desc++; 1553 1554 switch (key) { 1555 case 0x0200: { /* max_area */ 1556 u32 max_area = *desc++; 1557 max_area |= (u32)*desc++ << 8; 1558 max_area |= (u32)*desc++ << 16; 1559 max_area |= (u32)*desc++ << 24; 1560 dev_warn(&intf->dev, 1561 "DL chip limited to %d pixel modes\n", 1562 max_area); 1563 dlfb->sku_pixel_limit = max_area; 1564 break; 1565 } 1566 default: 1567 break; 1568 } 1569 desc += length; 1570 } 1571 } else { 1572 dev_info(&intf->dev, "vendor descriptor not available (%d)\n", 1573 total_len); 1574 } 1575 1576 goto success; 1577 1578 unrecognized: 1579 /* allow udlfb to load for now even if firmware unrecognized */ 1580 dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n"); 1581 1582 success: 1583 kfree(buf); 1584 return true; 1585 } 1586 1587 static int dlfb_usb_probe(struct usb_interface *intf, 1588 const struct usb_device_id *id) 1589 { 1590 int i; 1591 const struct device_attribute *attr; 1592 struct dlfb_data *dlfb; 1593 struct fb_info *info; 1594 int retval = -ENOMEM; 1595 struct usb_device *usbdev = interface_to_usbdev(intf); 1596 1597 /* usb initialization */ 1598 dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL); 1599 if (!dlfb) { 1600 dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__); 1601 return -ENOMEM; 1602 } 1603 1604 INIT_LIST_HEAD(&dlfb->deferred_free); 1605 1606 dlfb->udev = usb_get_dev(usbdev); 1607 usb_set_intfdata(intf, dlfb); 1608 1609 dev_dbg(&intf->dev, "console enable=%d\n", console); 1610 dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio); 1611 dev_dbg(&intf->dev, "shadow enable=%d\n", shadow); 1612 1613 dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */ 1614 1615 if (!dlfb_parse_vendor_descriptor(dlfb, intf)) { 1616 dev_err(&intf->dev, 1617 "firmware not recognized, incompatible device?\n"); 1618 goto error; 1619 } 1620 1621 if (pixel_limit) { 1622 dev_warn(&intf->dev, 1623 "DL chip limit of %d overridden to %d\n", 1624 dlfb->sku_pixel_limit, pixel_limit); 1625 dlfb->sku_pixel_limit = pixel_limit; 1626 } 1627 1628 1629 /* allocates framebuffer driver structure, not framebuffer memory */ 1630 info = framebuffer_alloc(0, &dlfb->udev->dev); 1631 if (!info) { 1632 dev_err(&dlfb->udev->dev, "framebuffer_alloc failed\n"); 1633 goto error; 1634 } 1635 1636 dlfb->info = info; 1637 info->par = dlfb; 1638 info->pseudo_palette = dlfb->pseudo_palette; 1639 dlfb->ops = dlfb_ops; 1640 info->fbops = &dlfb->ops; 1641 1642 INIT_LIST_HEAD(&info->modelist); 1643 1644 if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) { 1645 retval = -ENOMEM; 1646 dev_err(&intf->dev, "unable to allocate urb list\n"); 1647 goto error; 1648 } 1649 1650 /* We don't register a new USB class. Our client interface is dlfbev */ 1651 1652 retval = fb_alloc_cmap(&info->cmap, 256, 0); 1653 if (retval < 0) { 1654 dev_err(info->device, "cmap allocation failed: %d\n", retval); 1655 goto error; 1656 } 1657 1658 retval = dlfb_setup_modes(dlfb, info, NULL, 0); 1659 if (retval != 0) { 1660 dev_err(info->device, 1661 "unable to find common mode for display and adapter\n"); 1662 goto error; 1663 } 1664 1665 /* ready to begin using device */ 1666 1667 atomic_set(&dlfb->usb_active, 1); 1668 dlfb_select_std_channel(dlfb); 1669 1670 dlfb_ops_check_var(&info->var, info); 1671 retval = dlfb_ops_set_par(info); 1672 if (retval) 1673 goto error; 1674 1675 retval = register_framebuffer(info); 1676 if (retval < 0) { 1677 dev_err(info->device, "unable to register framebuffer: %d\n", 1678 retval); 1679 goto error; 1680 } 1681 1682 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { 1683 attr = &fb_device_attrs[i]; 1684 retval = device_create_file(info->dev, attr); 1685 if (retval) 1686 dev_warn(info->device, 1687 "failed to create '%s' attribute: %d\n", 1688 attr->attr.name, retval); 1689 } 1690 1691 retval = device_create_bin_file(info->dev, &edid_attr); 1692 if (retval) 1693 dev_warn(info->device, "failed to create '%s' attribute: %d\n", 1694 edid_attr.attr.name, retval); 1695 1696 dev_info(info->device, 1697 "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n", 1698 dev_name(info->dev), info->var.xres, info->var.yres, 1699 ((dlfb->backing_buffer) ? 1700 info->fix.smem_len * 2 : info->fix.smem_len) >> 10); 1701 return 0; 1702 1703 error: 1704 if (dlfb->info) { 1705 dlfb_ops_destroy(dlfb->info); 1706 } else { 1707 usb_put_dev(dlfb->udev); 1708 kfree(dlfb); 1709 } 1710 return retval; 1711 } 1712 1713 static void dlfb_usb_disconnect(struct usb_interface *intf) 1714 { 1715 struct dlfb_data *dlfb; 1716 struct fb_info *info; 1717 int i; 1718 1719 dlfb = usb_get_intfdata(intf); 1720 info = dlfb->info; 1721 1722 dev_dbg(&intf->dev, "USB disconnect starting\n"); 1723 1724 /* we virtualize until all fb clients release. Then we free */ 1725 dlfb->virtualized = true; 1726 1727 /* When non-active we'll update virtual framebuffer, but no new urbs */ 1728 atomic_set(&dlfb->usb_active, 0); 1729 1730 /* this function will wait for all in-flight urbs to complete */ 1731 dlfb_free_urb_list(dlfb); 1732 1733 /* remove udlfb's sysfs interfaces */ 1734 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) 1735 device_remove_file(info->dev, &fb_device_attrs[i]); 1736 device_remove_bin_file(info->dev, &edid_attr); 1737 1738 unregister_framebuffer(info); 1739 } 1740 1741 static struct usb_driver dlfb_driver = { 1742 .name = "udlfb", 1743 .probe = dlfb_usb_probe, 1744 .disconnect = dlfb_usb_disconnect, 1745 .id_table = id_table, 1746 }; 1747 1748 module_usb_driver(dlfb_driver); 1749 1750 static void dlfb_urb_completion(struct urb *urb) 1751 { 1752 struct urb_node *unode = urb->context; 1753 struct dlfb_data *dlfb = unode->dlfb; 1754 unsigned long flags; 1755 1756 switch (urb->status) { 1757 case 0: 1758 /* success */ 1759 break; 1760 case -ECONNRESET: 1761 case -ENOENT: 1762 case -ESHUTDOWN: 1763 /* sync/async unlink faults aren't errors */ 1764 break; 1765 default: 1766 dev_err(&dlfb->udev->dev, 1767 "%s - nonzero write bulk status received: %d\n", 1768 __func__, urb->status); 1769 atomic_set(&dlfb->lost_pixels, 1); 1770 break; 1771 } 1772 1773 urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */ 1774 1775 spin_lock_irqsave(&dlfb->urbs.lock, flags); 1776 list_add_tail(&unode->entry, &dlfb->urbs.list); 1777 dlfb->urbs.available++; 1778 spin_unlock_irqrestore(&dlfb->urbs.lock, flags); 1779 1780 up(&dlfb->urbs.limit_sem); 1781 } 1782 1783 static void dlfb_free_urb_list(struct dlfb_data *dlfb) 1784 { 1785 int count = dlfb->urbs.count; 1786 struct list_head *node; 1787 struct urb_node *unode; 1788 struct urb *urb; 1789 1790 /* keep waiting and freeing, until we've got 'em all */ 1791 while (count--) { 1792 down(&dlfb->urbs.limit_sem); 1793 1794 spin_lock_irq(&dlfb->urbs.lock); 1795 1796 node = dlfb->urbs.list.next; /* have reserved one with sem */ 1797 list_del_init(node); 1798 1799 spin_unlock_irq(&dlfb->urbs.lock); 1800 1801 unode = list_entry(node, struct urb_node, entry); 1802 urb = unode->urb; 1803 1804 /* Free each separately allocated piece */ 1805 usb_free_coherent(urb->dev, dlfb->urbs.size, 1806 urb->transfer_buffer, urb->transfer_dma); 1807 usb_free_urb(urb); 1808 kfree(node); 1809 } 1810 1811 dlfb->urbs.count = 0; 1812 } 1813 1814 static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size) 1815 { 1816 struct urb *urb; 1817 struct urb_node *unode; 1818 char *buf; 1819 size_t wanted_size = count * size; 1820 1821 spin_lock_init(&dlfb->urbs.lock); 1822 1823 retry: 1824 dlfb->urbs.size = size; 1825 INIT_LIST_HEAD(&dlfb->urbs.list); 1826 1827 sema_init(&dlfb->urbs.limit_sem, 0); 1828 dlfb->urbs.count = 0; 1829 dlfb->urbs.available = 0; 1830 1831 while (dlfb->urbs.count * size < wanted_size) { 1832 unode = kzalloc(sizeof(*unode), GFP_KERNEL); 1833 if (!unode) 1834 break; 1835 unode->dlfb = dlfb; 1836 1837 urb = usb_alloc_urb(0, GFP_KERNEL); 1838 if (!urb) { 1839 kfree(unode); 1840 break; 1841 } 1842 unode->urb = urb; 1843 1844 buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL, 1845 &urb->transfer_dma); 1846 if (!buf) { 1847 kfree(unode); 1848 usb_free_urb(urb); 1849 if (size > PAGE_SIZE) { 1850 size /= 2; 1851 dlfb_free_urb_list(dlfb); 1852 goto retry; 1853 } 1854 break; 1855 } 1856 1857 /* urb->transfer_buffer_length set to actual before submit */ 1858 usb_fill_bulk_urb(urb, dlfb->udev, usb_sndbulkpipe(dlfb->udev, 1), 1859 buf, size, dlfb_urb_completion, unode); 1860 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1861 1862 list_add_tail(&unode->entry, &dlfb->urbs.list); 1863 1864 up(&dlfb->urbs.limit_sem); 1865 dlfb->urbs.count++; 1866 dlfb->urbs.available++; 1867 } 1868 1869 return dlfb->urbs.count; 1870 } 1871 1872 static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) 1873 { 1874 int ret; 1875 struct list_head *entry; 1876 struct urb_node *unode; 1877 1878 /* Wait for an in-flight buffer to complete and get re-queued */ 1879 ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT); 1880 if (ret) { 1881 atomic_set(&dlfb->lost_pixels, 1); 1882 dev_warn(&dlfb->udev->dev, 1883 "wait for urb interrupted: %d available: %d\n", 1884 ret, dlfb->urbs.available); 1885 return NULL; 1886 } 1887 1888 spin_lock_irq(&dlfb->urbs.lock); 1889 1890 BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */ 1891 entry = dlfb->urbs.list.next; 1892 list_del_init(entry); 1893 dlfb->urbs.available--; 1894 1895 spin_unlock_irq(&dlfb->urbs.lock); 1896 1897 unode = list_entry(entry, struct urb_node, entry); 1898 return unode->urb; 1899 } 1900 1901 static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len) 1902 { 1903 int ret; 1904 1905 BUG_ON(len > dlfb->urbs.size); 1906 1907 urb->transfer_buffer_length = len; /* set to actual payload len */ 1908 ret = usb_submit_urb(urb, GFP_KERNEL); 1909 if (ret) { 1910 dlfb_urb_completion(urb); /* because no one else will */ 1911 atomic_set(&dlfb->lost_pixels, 1); 1912 dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret); 1913 } 1914 return ret; 1915 } 1916 1917 module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1918 MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer"); 1919 1920 module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1921 MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes"); 1922 1923 module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1924 MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf"); 1925 1926 module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1927 MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)"); 1928 1929 MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " 1930 "Jaya Kumar <jayakumar.lkml@gmail.com>, " 1931 "Bernie Thompson <bernie@plugable.com>"); 1932 MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); 1933 MODULE_LICENSE("GPL"); 1934 1935