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 29#include "udlfb.h" 30 31static struct fb_fix_screeninfo dlfb_fix = { 32 .id = "udlfb", 33 .type = FB_TYPE_PACKED_PIXELS, 34 .visual = FB_VISUAL_TRUECOLOR, 35 .xpanstep = 0, 36 .ypanstep = 0, 37 .ywrapstep = 0, 38 .accel = FB_ACCEL_NONE, 39}; 40 41static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | 42#ifdef FBINFO_VIRTFB 43 FBINFO_VIRTFB | 44#endif 45 FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | 46 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; 47 48/* 49 * There are many DisplayLink-based products, all with unique PIDs. We are able 50 * to support all volume ones (circa 2009) with a single driver, so we match 51 * globally on VID. TODO: Probe() needs to detect when we might be running 52 * "future" chips, and bail on those, so a compatible driver can match. 53 */ 54static struct usb_device_id id_table[] = { 55 {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,}, 56 {}, 57}; 58MODULE_DEVICE_TABLE(usb, id_table); 59 60#ifndef CONFIG_FB_DEFERRED_IO 61#warning Please set CONFIG_FB_DEFFERRED_IO option to support generic fbdev apps 62#endif 63 64#ifndef CONFIG_FB_SYS_IMAGEBLIT 65#ifndef CONFIG_FB_SYS_IMAGEBLIT_MODULE 66#warning Please set CONFIG_FB_SYS_IMAGEBLIT option to support fb console 67#endif 68#endif 69 70#ifndef CONFIG_FB_MODE_HELPERS 71#warning CONFIG_FB_MODE_HELPERS required. Expect build break 72#endif 73 74/* dlfb keeps a list of urbs for efficient bulk transfers */ 75static void dlfb_urb_completion(struct urb *urb); 76static struct urb *dlfb_get_urb(struct dlfb_data *dev); 77static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len); 78static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size); 79static void dlfb_free_urb_list(struct dlfb_data *dev); 80 81/* other symbols with dependents */ 82#ifdef CONFIG_FB_DEFERRED_IO 83static struct fb_deferred_io dlfb_defio; 84#endif 85 86/* 87 * All DisplayLink bulk operations start with 0xAF, followed by specific code 88 * All operations are written to buffers which then later get sent to device 89 */ 90static char *dlfb_set_register(char *buf, u8 reg, u8 val) 91{ 92 *buf++ = 0xAF; 93 *buf++ = 0x20; 94 *buf++ = reg; 95 *buf++ = val; 96 return buf; 97} 98 99static char *dlfb_vidreg_lock(char *buf) 100{ 101 return dlfb_set_register(buf, 0xFF, 0x00); 102} 103 104static char *dlfb_vidreg_unlock(char *buf) 105{ 106 return dlfb_set_register(buf, 0xFF, 0xFF); 107} 108 109/* 110 * On/Off for driving the DisplayLink framebuffer to the display 111 */ 112static char *dlfb_enable_hvsync(char *buf, bool enable) 113{ 114 if (enable) 115 return dlfb_set_register(buf, 0x1F, 0x00); 116 else 117 return dlfb_set_register(buf, 0x1F, 0x01); 118} 119 120static char *dlfb_set_color_depth(char *buf, u8 selection) 121{ 122 return dlfb_set_register(buf, 0x00, selection); 123} 124 125static char *dlfb_set_base16bpp(char *wrptr, u32 base) 126{ 127 /* the base pointer is 16 bits wide, 0x20 is hi byte. */ 128 wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); 129 wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); 130 return dlfb_set_register(wrptr, 0x22, base); 131} 132 133/* 134 * DisplayLink HW has separate 16bpp and 8bpp framebuffers. 135 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer 136 */ 137static char *dlfb_set_base8bpp(char *wrptr, u32 base) 138{ 139 wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); 140 wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); 141 return dlfb_set_register(wrptr, 0x28, base); 142} 143 144static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) 145{ 146 wrptr = dlfb_set_register(wrptr, reg, value >> 8); 147 return dlfb_set_register(wrptr, reg+1, value); 148} 149 150/* 151 * This is kind of weird because the controller takes some 152 * register values in a different byte order than other registers. 153 */ 154static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) 155{ 156 wrptr = dlfb_set_register(wrptr, reg, value); 157 return dlfb_set_register(wrptr, reg+1, value >> 8); 158} 159 160/* 161 * LFSR is linear feedback shift register. The reason we have this is 162 * because the display controller needs to minimize the clock depth of 163 * various counters used in the display path. So this code reverses the 164 * provided value into the lfsr16 value by counting backwards to get 165 * the value that needs to be set in the hardware comparator to get the 166 * same actual count. This makes sense once you read above a couple of 167 * times and think about it from a hardware perspective. 168 */ 169static u16 dlfb_lfsr16(u16 actual_count) 170{ 171 u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ 172 173 while (actual_count--) { 174 lv = ((lv << 1) | 175 (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) 176 & 0xFFFF; 177 } 178 179 return (u16) lv; 180} 181 182/* 183 * This does LFSR conversion on the value that is to be written. 184 * See LFSR explanation above for more detail. 185 */ 186static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) 187{ 188 return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); 189} 190 191/* 192 * This takes a standard fbdev screeninfo struct and all of its monitor mode 193 * details and converts them into the DisplayLink equivalent register commands. 194 */ 195static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) 196{ 197 u16 xds, yds; 198 u16 xde, yde; 199 u16 yec; 200 201 /* x display start */ 202 xds = var->left_margin + var->hsync_len; 203 wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); 204 /* x display end */ 205 xde = xds + var->xres; 206 wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); 207 208 /* y display start */ 209 yds = var->upper_margin + var->vsync_len; 210 wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); 211 /* y display end */ 212 yde = yds + var->yres; 213 wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); 214 215 /* x end count is active + blanking - 1 */ 216 wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, 217 xde + var->right_margin - 1); 218 219 /* libdlo hardcodes hsync start to 1 */ 220 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); 221 222 /* hsync end is width of sync pulse + 1 */ 223 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); 224 225 /* hpixels is active pixels */ 226 wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); 227 228 /* yendcount is vertical active + vertical blanking */ 229 yec = var->yres + var->upper_margin + var->lower_margin + 230 var->vsync_len; 231 wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); 232 233 /* libdlo hardcodes vsync start to 0 */ 234 wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); 235 236 /* vsync end is width of vsync pulse */ 237 wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); 238 239 /* vpixels is active pixels */ 240 wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); 241 242 /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ 243 wrptr = dlfb_set_register_16be(wrptr, 0x1B, 244 200*1000*1000/var->pixclock); 245 246 return wrptr; 247} 248 249/* 250 * This takes a standard fbdev screeninfo struct that was fetched or prepared 251 * and then generates the appropriate command sequence that then drives the 252 * display controller. 253 */ 254static int dlfb_set_video_mode(struct dlfb_data *dev, 255 struct fb_var_screeninfo *var) 256{ 257 char *buf; 258 char *wrptr; 259 int retval = 0; 260 int writesize; 261 struct urb *urb; 262 263 if (!atomic_read(&dev->usb_active)) 264 return -EPERM; 265 266 urb = dlfb_get_urb(dev); 267 if (!urb) 268 return -ENOMEM; 269 buf = (char *) urb->transfer_buffer; 270 271 /* 272 * This first section has to do with setting the base address on the 273 * controller * associated with the display. There are 2 base 274 * pointers, currently, we only * use the 16 bpp segment. 275 */ 276 wrptr = dlfb_vidreg_lock(buf); 277 wrptr = dlfb_set_color_depth(wrptr, 0x00); 278 /* set base for 16bpp segment to 0 */ 279 wrptr = dlfb_set_base16bpp(wrptr, 0); 280 /* set base for 8bpp segment to end of fb */ 281 wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); 282 283 wrptr = dlfb_set_vid_cmds(wrptr, var); 284 wrptr = dlfb_enable_hvsync(wrptr, true); 285 wrptr = dlfb_vidreg_unlock(wrptr); 286 287 writesize = wrptr - buf; 288 289 retval = dlfb_submit_urb(dev, urb, writesize); 290 291 return retval; 292} 293 294static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) 295{ 296 unsigned long start = vma->vm_start; 297 unsigned long size = vma->vm_end - vma->vm_start; 298 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 299 unsigned long page, pos; 300 struct dlfb_data *dev = info->par; 301 302 dl_notice("MMAP: %lu %u\n", offset + size, info->fix.smem_len); 303 304 if (offset + size > info->fix.smem_len) 305 return -EINVAL; 306 307 pos = (unsigned long)info->fix.smem_start + offset; 308 309 while (size > 0) { 310 page = vmalloc_to_pfn((void *)pos); 311 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) 312 return -EAGAIN; 313 314 start += PAGE_SIZE; 315 pos += PAGE_SIZE; 316 if (size > PAGE_SIZE) 317 size -= PAGE_SIZE; 318 else 319 size = 0; 320 } 321 322 vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ 323 return 0; 324 325} 326 327/* 328 * Trims identical data from front and back of line 329 * Sets new front buffer address and width 330 * And returns byte count of identical pixels 331 * Assumes CPU natural alignment (unsigned long) 332 * for back and front buffer ptrs and width 333 */ 334static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) 335{ 336 int j, k; 337 const unsigned long *back = (const unsigned long *) bback; 338 const unsigned long *front = (const unsigned long *) *bfront; 339 const int width = *width_bytes / sizeof(unsigned long); 340 int identical = width; 341 int start = width; 342 int end = width; 343 344 prefetch((void *) front); 345 prefetch((void *) back); 346 347 for (j = 0; j < width; j++) { 348 if (back[j] != front[j]) { 349 start = j; 350 break; 351 } 352 } 353 354 for (k = width - 1; k > j; k--) { 355 if (back[k] != front[k]) { 356 end = k+1; 357 break; 358 } 359 } 360 361 identical = start + (width - end); 362 *bfront = (u8 *) &front[start]; 363 *width_bytes = (end - start) * sizeof(unsigned long); 364 365 return identical * sizeof(unsigned long); 366} 367 368/* 369 * Render a command stream for an encoded horizontal line segment of pixels. 370 * 371 * A command buffer holds several commands. 372 * It always begins with a fresh command header 373 * (the protocol doesn't require this, but we enforce it to allow 374 * multiple buffers to be potentially encoded and sent in parallel). 375 * A single command encodes one contiguous horizontal line of pixels 376 * 377 * The function relies on the client to do all allocation, so that 378 * rendering can be done directly to output buffers (e.g. USB URBs). 379 * The function fills the supplied command buffer, providing information 380 * on where it left off, so the client may call in again with additional 381 * buffers if the line will take several buffers to complete. 382 * 383 * A single command can transmit a maximum of 256 pixels, 384 * regardless of the compression ratio (protocol design limit). 385 * To the hardware, 0 for a size byte means 256 386 * 387 * Rather than 256 pixel commands which are either rl or raw encoded, 388 * the rlx command simply assumes alternating raw and rl spans within one cmd. 389 * This has a slightly larger header overhead, but produces more even results. 390 * It also processes all data (read and write) in a single pass. 391 * Performance benchmarks of common cases show it having just slightly better 392 * compression than 256 pixel raw -or- rle commands, with similar CPU consumpion. 393 * But for very rl friendly data, will compress not quite as well. 394 */ 395static void dlfb_compress_hline( 396 const uint16_t **pixel_start_ptr, 397 const uint16_t *const pixel_end, 398 uint32_t *device_address_ptr, 399 uint8_t **command_buffer_ptr, 400 const uint8_t *const cmd_buffer_end) 401{ 402 const uint16_t *pixel = *pixel_start_ptr; 403 uint32_t dev_addr = *device_address_ptr; 404 uint8_t *cmd = *command_buffer_ptr; 405 const int bpp = 2; 406 407 while ((pixel_end > pixel) && 408 (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { 409 uint8_t *raw_pixels_count_byte = 0; 410 uint8_t *cmd_pixels_count_byte = 0; 411 const uint16_t *raw_pixel_start = 0; 412 const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0; 413 const uint32_t be_dev_addr = cpu_to_be32(dev_addr); 414 415 prefetchw((void *) cmd); /* pull in one cache line at least */ 416 417 *cmd++ = 0xAF; 418 *cmd++ = 0x6B; 419 *cmd++ = (uint8_t) ((be_dev_addr >> 8) & 0xFF); 420 *cmd++ = (uint8_t) ((be_dev_addr >> 16) & 0xFF); 421 *cmd++ = (uint8_t) ((be_dev_addr >> 24) & 0xFF); 422 423 cmd_pixels_count_byte = cmd++; /* we'll know this later */ 424 cmd_pixel_start = pixel; 425 426 raw_pixels_count_byte = cmd++; /* we'll know this later */ 427 raw_pixel_start = pixel; 428 429 cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1, 430 min((int)(pixel_end - pixel), 431 (int)(cmd_buffer_end - cmd) / bpp)); 432 433 prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp); 434 435 while (pixel < cmd_pixel_end) { 436 const uint16_t * const repeating_pixel = pixel; 437 438 *(uint16_t *)cmd = cpu_to_be16p(pixel); 439 cmd += 2; 440 pixel++; 441 442 if (unlikely((pixel < cmd_pixel_end) && 443 (*pixel == *repeating_pixel))) { 444 /* go back and fill in raw pixel count */ 445 *raw_pixels_count_byte = ((repeating_pixel - 446 raw_pixel_start) + 1) & 0xFF; 447 448 while ((pixel < cmd_pixel_end) 449 && (*pixel == *repeating_pixel)) { 450 pixel++; 451 } 452 453 /* immediately after raw data is repeat byte */ 454 *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; 455 456 /* Then start another raw pixel span */ 457 raw_pixel_start = pixel; 458 raw_pixels_count_byte = cmd++; 459 } 460 } 461 462 if (pixel > raw_pixel_start) { 463 /* finalize last RAW span */ 464 *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; 465 } 466 467 *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; 468 dev_addr += (pixel - cmd_pixel_start) * bpp; 469 } 470 471 if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) { 472 /* Fill leftover bytes with no-ops */ 473 if (cmd_buffer_end > cmd) 474 memset(cmd, 0xAF, cmd_buffer_end - cmd); 475 cmd = (uint8_t *) cmd_buffer_end; 476 } 477 478 *command_buffer_ptr = cmd; 479 *pixel_start_ptr = pixel; 480 *device_address_ptr = dev_addr; 481 482 return; 483} 484 485/* 486 * There are 3 copies of every pixel: The front buffer that the fbdev 487 * client renders to, the actual framebuffer across the USB bus in hardware 488 * (that we can only write to, slowly, and can never read), and (optionally) 489 * our shadow copy that tracks what's been sent to that hardware buffer. 490 */ 491static void dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr, 492 const char *front, char **urb_buf_ptr, 493 u32 byte_offset, u32 byte_width, 494 int *ident_ptr, int *sent_ptr) 495{ 496 const u8 *line_start, *line_end, *next_pixel; 497 u32 dev_addr = dev->base16 + byte_offset; 498 struct urb *urb = *urb_ptr; 499 u8 *cmd = *urb_buf_ptr; 500 u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; 501 502 line_start = (u8 *) (front + byte_offset); 503 next_pixel = line_start; 504 line_end = next_pixel + byte_width; 505 506 if (dev->backing_buffer) { 507 int offset; 508 const u8 *back_start = (u8 *) (dev->backing_buffer 509 + byte_offset); 510 511 *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, 512 &byte_width); 513 514 offset = next_pixel - line_start; 515 line_end = next_pixel + byte_width; 516 dev_addr += offset; 517 back_start += offset; 518 line_start += offset; 519 520 memcpy((char *)back_start, (char *) line_start, 521 byte_width); 522 } 523 524 while (next_pixel < line_end) { 525 526 dlfb_compress_hline((const uint16_t **) &next_pixel, 527 (const uint16_t *) line_end, &dev_addr, 528 (u8 **) &cmd, (u8 *) cmd_end); 529 530 if (cmd >= cmd_end) { 531 int len = cmd - (u8 *) urb->transfer_buffer; 532 if (dlfb_submit_urb(dev, urb, len)) 533 return; /* lost pixels is set */ 534 *sent_ptr += len; 535 urb = dlfb_get_urb(dev); 536 if (!urb) 537 return; /* lost_pixels is set */ 538 *urb_ptr = urb; 539 cmd = urb->transfer_buffer; 540 cmd_end = &cmd[urb->transfer_buffer_length]; 541 } 542 } 543 544 *urb_buf_ptr = cmd; 545} 546 547int dlfb_handle_damage(struct dlfb_data *dev, int x, int y, 548 int width, int height, char *data) 549{ 550 int i, ret; 551 char *cmd; 552 cycles_t start_cycles, end_cycles; 553 int bytes_sent = 0; 554 int bytes_identical = 0; 555 struct urb *urb; 556 int aligned_x; 557 558 start_cycles = get_cycles(); 559 560 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); 561 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); 562 x = aligned_x; 563 564 if ((width <= 0) || 565 (x + width > dev->info->var.xres) || 566 (y + height > dev->info->var.yres)) 567 return -EINVAL; 568 569 if (!atomic_read(&dev->usb_active)) 570 return 0; 571 572 urb = dlfb_get_urb(dev); 573 if (!urb) 574 return 0; 575 cmd = urb->transfer_buffer; 576 577 for (i = y; i < y + height ; i++) { 578 const int line_offset = dev->info->fix.line_length * i; 579 const int byte_offset = line_offset + (x * BPP); 580 581 dlfb_render_hline(dev, &urb, (char *) dev->info->fix.smem_start, 582 &cmd, byte_offset, width * BPP, 583 &bytes_identical, &bytes_sent); 584 } 585 586 if (cmd > (char *) urb->transfer_buffer) { 587 /* Send partial buffer remaining before exiting */ 588 int len = cmd - (char *) urb->transfer_buffer; 589 ret = dlfb_submit_urb(dev, urb, len); 590 bytes_sent += len; 591 } else 592 dlfb_urb_completion(urb); 593 594 atomic_add(bytes_sent, &dev->bytes_sent); 595 atomic_add(bytes_identical, &dev->bytes_identical); 596 atomic_add(width*height*2, &dev->bytes_rendered); 597 end_cycles = get_cycles(); 598 atomic_add(((unsigned int) ((end_cycles - start_cycles) 599 >> 10)), /* Kcycles */ 600 &dev->cpu_kcycles_used); 601 602 return 0; 603} 604 605/* hardware has native COPY command (see libdlo), but not worth it for fbcon */ 606static void dlfb_ops_copyarea(struct fb_info *info, 607 const struct fb_copyarea *area) 608{ 609 610 struct dlfb_data *dev = info->par; 611 612#if defined CONFIG_FB_SYS_COPYAREA || defined CONFIG_FB_SYS_COPYAREA_MODULE 613 614 sys_copyarea(info, area); 615 616 dlfb_handle_damage(dev, area->dx, area->dy, 617 area->width, area->height, info->screen_base); 618#endif 619 atomic_inc(&dev->copy_count); 620 621} 622 623static void dlfb_ops_imageblit(struct fb_info *info, 624 const struct fb_image *image) 625{ 626 struct dlfb_data *dev = info->par; 627 628#if defined CONFIG_FB_SYS_IMAGEBLIT || defined CONFIG_FB_SYS_IMAGEBLIT_MODULE 629 630 sys_imageblit(info, image); 631 632 dlfb_handle_damage(dev, image->dx, image->dy, 633 image->width, image->height, info->screen_base); 634 635#endif 636 637 atomic_inc(&dev->blit_count); 638} 639 640static void dlfb_ops_fillrect(struct fb_info *info, 641 const struct fb_fillrect *rect) 642{ 643 struct dlfb_data *dev = info->par; 644 645#if defined CONFIG_FB_SYS_FILLRECT || defined CONFIG_FB_SYS_FILLRECT_MODULE 646 647 sys_fillrect(info, rect); 648 649 dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width, 650 rect->height, info->screen_base); 651#endif 652 653 atomic_inc(&dev->fill_count); 654 655} 656 657static void dlfb_get_edid(struct dlfb_data *dev) 658{ 659 int i; 660 int ret; 661 char rbuf[2]; 662 663 for (i = 0; i < sizeof(dev->edid); i++) { 664 ret = usb_control_msg(dev->udev, 665 usb_rcvctrlpipe(dev->udev, 0), (0x02), 666 (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, 667 0); 668 dev->edid[i] = rbuf[1]; 669 } 670} 671 672static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, 673 unsigned long arg) 674{ 675 676 struct dlfb_data *dev = info->par; 677 struct dloarea *area = NULL; 678 679 if (!atomic_read(&dev->usb_active)) 680 return 0; 681 682 /* TODO: Update X server to get this from sysfs instead */ 683 if (cmd == DLFB_IOCTL_RETURN_EDID) { 684 char *edid = (char *)arg; 685 dlfb_get_edid(dev); 686 if (copy_to_user(edid, dev->edid, sizeof(dev->edid))) 687 return -EFAULT; 688 return 0; 689 } 690 691 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ 692 if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { 693 694 area = (struct dloarea *)arg; 695 696 if (area->x < 0) 697 area->x = 0; 698 699 if (area->x > info->var.xres) 700 area->x = info->var.xres; 701 702 if (area->y < 0) 703 area->y = 0; 704 705 if (area->y > info->var.yres) 706 area->y = info->var.yres; 707 708 atomic_set(&dev->use_defio, 0); 709 710 dlfb_handle_damage(dev, area->x, area->y, area->w, area->h, 711 info->screen_base); 712 atomic_inc(&dev->damage_count); 713 } 714 715 return 0; 716} 717 718/* taken from vesafb */ 719static int 720dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, 721 unsigned blue, unsigned transp, struct fb_info *info) 722{ 723 int err = 0; 724 725 if (regno >= info->cmap.len) 726 return 1; 727 728 if (regno < 16) { 729 if (info->var.red.offset == 10) { 730 /* 1:5:5:5 */ 731 ((u32 *) (info->pseudo_palette))[regno] = 732 ((red & 0xf800) >> 1) | 733 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); 734 } else { 735 /* 0:5:6:5 */ 736 ((u32 *) (info->pseudo_palette))[regno] = 737 ((red & 0xf800)) | 738 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); 739 } 740 } 741 742 return err; 743} 744 745/* 746 * It's common for several clients to have framebuffer open simultaneously. 747 * e.g. both fbcon and X. Makes things interesting. 748 */ 749static int dlfb_ops_open(struct fb_info *info, int user) 750{ 751 struct dlfb_data *dev = info->par; 752 753/* if (user == 0) 754 * We could special case kernel mode clients (fbcon) here 755 */ 756 757 mutex_lock(&dev->fb_open_lock); 758 759 dev->fb_count++; 760 761#ifdef CONFIG_FB_DEFERRED_IO 762 if ((atomic_read(&dev->use_defio)) && (info->fbdefio == NULL)) { 763 /* enable defio */ 764 info->fbdefio = &dlfb_defio; 765 fb_deferred_io_init(info); 766 } 767#endif 768 769 dl_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", 770 info->node, user, info, dev->fb_count); 771 772 mutex_unlock(&dev->fb_open_lock); 773 774 return 0; 775} 776 777static int dlfb_ops_release(struct fb_info *info, int user) 778{ 779 struct dlfb_data *dev = info->par; 780 781 mutex_lock(&dev->fb_open_lock); 782 783 dev->fb_count--; 784 785#ifdef CONFIG_FB_DEFERRED_IO 786 if ((dev->fb_count == 0) && (info->fbdefio)) { 787 fb_deferred_io_cleanup(info); 788 info->fbdefio = NULL; 789 info->fbops->fb_mmap = dlfb_ops_mmap; 790 } 791#endif 792 793 dl_notice("release /dev/fb%d user=%d count=%d\n", 794 info->node, user, dev->fb_count); 795 796 mutex_unlock(&dev->fb_open_lock); 797 798 return 0; 799} 800 801/* 802 * Called when all client interfaces to start transactions have been disabled, 803 * and all references to our device instance (dlfb_data) are released. 804 * Every transaction must have a reference, so we know are fully spun down 805 */ 806static void dlfb_delete(struct kref *kref) 807{ 808 struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref); 809 810 if (dev->backing_buffer) 811 vfree(dev->backing_buffer); 812 813 mutex_destroy(&dev->fb_open_lock); 814 815 kfree(dev); 816} 817 818/* 819 * Called by fbdev as last part of unregister_framebuffer() process 820 * No new clients can open connections. Deallocate everything fb_info. 821 */ 822static void dlfb_ops_destroy(struct fb_info *info) 823{ 824 struct dlfb_data *dev = info->par; 825 826 if (info->cmap.len != 0) 827 fb_dealloc_cmap(&info->cmap); 828 if (info->monspecs.modedb) 829 fb_destroy_modedb(info->monspecs.modedb); 830 if (info->screen_base) 831 vfree(info->screen_base); 832 833 fb_destroy_modelist(&info->modelist); 834 835 framebuffer_release(info); 836 837 /* ref taken before register_framebuffer() for dlfb_data clients */ 838 kref_put(&dev->kref, dlfb_delete); 839} 840 841/* 842 * Check whether a video mode is supported by the DisplayLink chip 843 * We start from monitor's modes, so don't need to filter that here 844 */ 845static int dlfb_is_valid_mode(struct fb_videomode *mode, 846 struct fb_info *info) 847{ 848 struct dlfb_data *dev = info->par; 849 850 if (mode->xres * mode->yres > dev->sku_pixel_limit) 851 return 0; 852 853 return 1; 854} 855 856static void dlfb_var_color_format(struct fb_var_screeninfo *var) 857{ 858 const struct fb_bitfield red = { 11, 5, 0 }; 859 const struct fb_bitfield green = { 5, 6, 0 }; 860 const struct fb_bitfield blue = { 0, 5, 0 }; 861 862 var->bits_per_pixel = 16; 863 var->red = red; 864 var->green = green; 865 var->blue = blue; 866} 867 868static int dlfb_ops_check_var(struct fb_var_screeninfo *var, 869 struct fb_info *info) 870{ 871 struct fb_videomode mode; 872 873 /* TODO: support dynamically changing framebuffer size */ 874 if ((var->xres * var->yres * 2) > info->fix.smem_len) 875 return -EINVAL; 876 877 /* set device-specific elements of var unrelated to mode */ 878 dlfb_var_color_format(var); 879 880 fb_var_to_videomode(&mode, var); 881 882 if (!dlfb_is_valid_mode(&mode, info)) 883 return -EINVAL; 884 885 return 0; 886} 887 888static int dlfb_ops_set_par(struct fb_info *info) 889{ 890 struct dlfb_data *dev = info->par; 891 892 dl_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres); 893 894 return dlfb_set_video_mode(dev, &info->var); 895} 896 897static int dlfb_ops_blank(int blank_mode, struct fb_info *info) 898{ 899 struct dlfb_data *dev = info->par; 900 char *bufptr; 901 struct urb *urb; 902 903 urb = dlfb_get_urb(dev); 904 if (!urb) 905 return 0; 906 bufptr = (char *) urb->transfer_buffer; 907 908 /* overloading usb_active. UNBLANK can conflict with teardown */ 909 910 bufptr = dlfb_vidreg_lock(bufptr); 911 if (blank_mode != FB_BLANK_UNBLANK) { 912 atomic_set(&dev->usb_active, 0); 913 bufptr = dlfb_enable_hvsync(bufptr, false); 914 } else { 915 atomic_set(&dev->usb_active, 1); 916 bufptr = dlfb_enable_hvsync(bufptr, true); 917 } 918 bufptr = dlfb_vidreg_unlock(bufptr); 919 920 dlfb_submit_urb(dev, urb, bufptr - (char *) urb->transfer_buffer); 921 922 return 0; 923} 924 925static struct fb_ops dlfb_ops = { 926 .owner = THIS_MODULE, 927 .fb_setcolreg = dlfb_ops_setcolreg, 928 .fb_fillrect = dlfb_ops_fillrect, 929 .fb_copyarea = dlfb_ops_copyarea, 930 .fb_imageblit = dlfb_ops_imageblit, 931 .fb_mmap = dlfb_ops_mmap, 932 .fb_ioctl = dlfb_ops_ioctl, 933 .fb_open = dlfb_ops_open, 934 .fb_release = dlfb_ops_release, 935 .fb_blank = dlfb_ops_blank, 936 .fb_check_var = dlfb_ops_check_var, 937 .fb_set_par = dlfb_ops_set_par, 938}; 939 940/* 941 * Calls dlfb_get_edid() to query the EDID of attached monitor via usb cmds 942 * Then parses EDID into three places used by various parts of fbdev: 943 * fb_var_screeninfo contains the timing of the monitor's preferred mode 944 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb 945 * fb_info.modelist is a linked list of all monitor & VESA modes which work 946 * 947 * If EDID is not readable/valid, then modelist is all VESA modes, 948 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode 949 * Returns 0 if EDID parses successfully 950 */ 951static int dlfb_parse_edid(struct dlfb_data *dev, 952 struct fb_var_screeninfo *var, 953 struct fb_info *info) 954{ 955 int i; 956 const struct fb_videomode *default_vmode = NULL; 957 int result = 0; 958 959 fb_destroy_modelist(&info->modelist); 960 memset(&info->monspecs, 0, sizeof(info->monspecs)); 961 962 dlfb_get_edid(dev); 963 fb_edid_to_monspecs(dev->edid, &info->monspecs); 964 965 if (info->monspecs.modedb_len > 0) { 966 967 for (i = 0; i < info->monspecs.modedb_len; i++) { 968 if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info)) 969 fb_add_videomode(&info->monspecs.modedb[i], 970 &info->modelist); 971 } 972 973 default_vmode = fb_find_best_display(&info->monspecs, 974 &info->modelist); 975 } else { 976 struct fb_videomode fb_vmode = {0}; 977 978 dl_err("Unable to get valid EDID from device/display\n"); 979 result = 1; 980 981 /* 982 * Add the standard VESA modes to our modelist 983 * Since we don't have EDID, there may be modes that 984 * overspec monitor and/or are incorrect aspect ratio, etc. 985 * But at least the user has a chance to choose 986 */ 987 for (i = 0; i < VESA_MODEDB_SIZE; i++) { 988 if (dlfb_is_valid_mode((struct fb_videomode *) 989 &vesa_modes[i], info)) 990 fb_add_videomode(&vesa_modes[i], 991 &info->modelist); 992 } 993 994 /* 995 * default to resolution safe for projectors 996 * (since they are most common case without EDID) 997 */ 998 fb_vmode.xres = 800; 999 fb_vmode.yres = 600; 1000 fb_vmode.refresh = 60; 1001 default_vmode = fb_find_nearest_mode(&fb_vmode, 1002 &info->modelist); 1003 } 1004 1005 fb_videomode_to_var(var, default_vmode); 1006 dlfb_var_color_format(var); 1007 1008 return result; 1009} 1010 1011static ssize_t metrics_bytes_rendered_show(struct device *fbdev, 1012 struct device_attribute *a, char *buf) { 1013 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1014 struct dlfb_data *dev = fb_info->par; 1015 return snprintf(buf, PAGE_SIZE, "%u\n", 1016 atomic_read(&dev->bytes_rendered)); 1017} 1018 1019static ssize_t metrics_bytes_identical_show(struct device *fbdev, 1020 struct device_attribute *a, char *buf) { 1021 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1022 struct dlfb_data *dev = fb_info->par; 1023 return snprintf(buf, PAGE_SIZE, "%u\n", 1024 atomic_read(&dev->bytes_identical)); 1025} 1026 1027static ssize_t metrics_bytes_sent_show(struct device *fbdev, 1028 struct device_attribute *a, char *buf) { 1029 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1030 struct dlfb_data *dev = fb_info->par; 1031 return snprintf(buf, PAGE_SIZE, "%u\n", 1032 atomic_read(&dev->bytes_sent)); 1033} 1034 1035static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, 1036 struct device_attribute *a, char *buf) { 1037 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1038 struct dlfb_data *dev = fb_info->par; 1039 return snprintf(buf, PAGE_SIZE, "%u\n", 1040 atomic_read(&dev->cpu_kcycles_used)); 1041} 1042 1043static ssize_t metrics_misc_show(struct device *fbdev, 1044 struct device_attribute *a, char *buf) { 1045 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1046 struct dlfb_data *dev = fb_info->par; 1047 return snprintf(buf, PAGE_SIZE, 1048 "Calls to\ndamage: %u\nblit: %u\n" 1049 "defio faults: %u\ncopy: %u\n" 1050 "fill: %u\n\n" 1051 "active framebuffer clients: %d\n" 1052 "urbs available %d(%d)\n" 1053 "Shadow framebuffer in use? %s\n" 1054 "Any lost pixels? %s\n", 1055 atomic_read(&dev->damage_count), 1056 atomic_read(&dev->blit_count), 1057 atomic_read(&dev->defio_fault_count), 1058 atomic_read(&dev->copy_count), 1059 atomic_read(&dev->fill_count), 1060 dev->fb_count, 1061 dev->urbs.available, dev->urbs.limit_sem.count, 1062 (dev->backing_buffer) ? "yes" : "no", 1063 atomic_read(&dev->lost_pixels) ? "yes" : "no"); 1064} 1065 1066static ssize_t edid_show(struct file *filp, struct kobject *kobj, 1067 struct bin_attribute *a, 1068 char *buf, loff_t off, size_t count) { 1069 struct device *fbdev = container_of(kobj, struct device, kobj); 1070 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1071 struct dlfb_data *dev = fb_info->par; 1072 char *edid = &dev->edid[0]; 1073 const size_t size = sizeof(dev->edid); 1074 1075 if (dlfb_parse_edid(dev, &fb_info->var, fb_info)) 1076 return 0; 1077 1078 if (off >= size) 1079 return 0; 1080 1081 if (off + count > size) 1082 count = size - off; 1083 memcpy(buf, edid + off, count); 1084 1085 return count; 1086} 1087 1088 1089static ssize_t metrics_reset_store(struct device *fbdev, 1090 struct device_attribute *attr, 1091 const char *buf, size_t count) 1092{ 1093 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1094 struct dlfb_data *dev = fb_info->par; 1095 1096 atomic_set(&dev->bytes_rendered, 0); 1097 atomic_set(&dev->bytes_identical, 0); 1098 atomic_set(&dev->bytes_sent, 0); 1099 atomic_set(&dev->cpu_kcycles_used, 0); 1100 atomic_set(&dev->blit_count, 0); 1101 atomic_set(&dev->copy_count, 0); 1102 atomic_set(&dev->fill_count, 0); 1103 atomic_set(&dev->defio_fault_count, 0); 1104 atomic_set(&dev->damage_count, 0); 1105 1106 return count; 1107} 1108 1109static ssize_t use_defio_show(struct device *fbdev, 1110 struct device_attribute *a, char *buf) { 1111 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1112 struct dlfb_data *dev = fb_info->par; 1113 return snprintf(buf, PAGE_SIZE, "%d\n", 1114 atomic_read(&dev->use_defio)); 1115} 1116 1117static ssize_t use_defio_store(struct device *fbdev, 1118 struct device_attribute *attr, 1119 const char *buf, size_t count) 1120{ 1121 struct fb_info *fb_info = dev_get_drvdata(fbdev); 1122 struct dlfb_data *dev = fb_info->par; 1123 1124 if (count > 0) { 1125 if (buf[0] == '0') 1126 atomic_set(&dev->use_defio, 0); 1127 if (buf[0] == '1') 1128 atomic_set(&dev->use_defio, 1); 1129 } 1130 return count; 1131} 1132 1133static struct bin_attribute edid_attr = { 1134 .attr.name = "edid", 1135 .attr.mode = 0444, 1136 .size = 128, 1137 .read = edid_show, 1138}; 1139 1140static struct device_attribute fb_device_attrs[] = { 1141 __ATTR_RO(metrics_bytes_rendered), 1142 __ATTR_RO(metrics_bytes_identical), 1143 __ATTR_RO(metrics_bytes_sent), 1144 __ATTR_RO(metrics_cpu_kcycles_used), 1145 __ATTR_RO(metrics_misc), 1146 __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), 1147 __ATTR_RW(use_defio), 1148}; 1149 1150#ifdef CONFIG_FB_DEFERRED_IO 1151static void dlfb_dpy_deferred_io(struct fb_info *info, 1152 struct list_head *pagelist) 1153{ 1154 struct page *cur; 1155 struct fb_deferred_io *fbdefio = info->fbdefio; 1156 struct dlfb_data *dev = info->par; 1157 struct urb *urb; 1158 char *cmd; 1159 cycles_t start_cycles, end_cycles; 1160 int bytes_sent = 0; 1161 int bytes_identical = 0; 1162 int bytes_rendered = 0; 1163 int fault_count = 0; 1164 1165 if (!atomic_read(&dev->use_defio)) 1166 return; 1167 1168 if (!atomic_read(&dev->usb_active)) 1169 return; 1170 1171 start_cycles = get_cycles(); 1172 1173 urb = dlfb_get_urb(dev); 1174 if (!urb) 1175 return; 1176 cmd = urb->transfer_buffer; 1177 1178 /* walk the written page list and render each to device */ 1179 list_for_each_entry(cur, &fbdefio->pagelist, lru) { 1180 dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start, 1181 &cmd, cur->index << PAGE_SHIFT, 1182 PAGE_SIZE, &bytes_identical, &bytes_sent); 1183 bytes_rendered += PAGE_SIZE; 1184 fault_count++; 1185 } 1186 1187 if (cmd > (char *) urb->transfer_buffer) { 1188 /* Send partial buffer remaining before exiting */ 1189 int len = cmd - (char *) urb->transfer_buffer; 1190 dlfb_submit_urb(dev, urb, len); 1191 bytes_sent += len; 1192 } else 1193 dlfb_urb_completion(urb); 1194 1195 atomic_add(fault_count, &dev->defio_fault_count); 1196 atomic_add(bytes_sent, &dev->bytes_sent); 1197 atomic_add(bytes_identical, &dev->bytes_identical); 1198 atomic_add(bytes_rendered, &dev->bytes_rendered); 1199 end_cycles = get_cycles(); 1200 atomic_add(((unsigned int) ((end_cycles - start_cycles) 1201 >> 10)), /* Kcycles */ 1202 &dev->cpu_kcycles_used); 1203} 1204 1205static struct fb_deferred_io dlfb_defio = { 1206 .delay = 5, 1207 .deferred_io = dlfb_dpy_deferred_io, 1208}; 1209 1210#endif 1211 1212/* 1213 * This is necessary before we can communicate with the display controller. 1214 */ 1215static int dlfb_select_std_channel(struct dlfb_data *dev) 1216{ 1217 int ret; 1218 u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7, 1219 0x1C, 0x88, 0x5E, 0x15, 1220 0x60, 0xFE, 0xC6, 0x97, 1221 0x16, 0x3D, 0x47, 0xF2 }; 1222 1223 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1224 NR_USB_REQUEST_CHANNEL, 1225 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, 1226 set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); 1227 return ret; 1228} 1229 1230 1231static int dlfb_usb_probe(struct usb_interface *interface, 1232 const struct usb_device_id *id) 1233{ 1234 struct usb_device *usbdev; 1235 struct dlfb_data *dev; 1236 struct fb_info *info; 1237 int videomemorysize; 1238 int i; 1239 unsigned char *videomemory; 1240 int retval = -ENOMEM; 1241 struct fb_var_screeninfo *var; 1242 int registered = 0; 1243 u16 *pix_framebuffer; 1244 1245 /* usb initialization */ 1246 1247 usbdev = interface_to_usbdev(interface); 1248 1249 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1250 if (dev == NULL) { 1251 err("dlfb_usb_probe: failed alloc of dev struct\n"); 1252 goto error; 1253 } 1254 1255 /* we need to wait for both usb and fbdev to spin down on disconnect */ 1256 kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ 1257 kref_get(&dev->kref); /* matching kref_put in .fb_destroy function*/ 1258 1259 dev->udev = usbdev; 1260 dev->gdev = &usbdev->dev; /* our generic struct device * */ 1261 usb_set_intfdata(interface, dev); 1262 1263 if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { 1264 retval = -ENOMEM; 1265 dl_err("dlfb_alloc_urb_list failed\n"); 1266 goto error; 1267 } 1268 1269 mutex_init(&dev->fb_open_lock); 1270 1271 /* We don't register a new USB class. Our client interface is fbdev */ 1272 1273 /* allocates framebuffer driver structure, not framebuffer memory */ 1274 info = framebuffer_alloc(0, &usbdev->dev); 1275 if (!info) { 1276 retval = -ENOMEM; 1277 dl_err("framebuffer_alloc failed\n"); 1278 goto error; 1279 } 1280 dev->info = info; 1281 info->par = dev; 1282 info->pseudo_palette = dev->pseudo_palette; 1283 info->fbops = &dlfb_ops; 1284 1285 var = &info->var; 1286 1287 /* TODO set limit based on actual SKU detection */ 1288 dev->sku_pixel_limit = 2048 * 1152; 1289 1290 INIT_LIST_HEAD(&info->modelist); 1291 dlfb_parse_edid(dev, var, info); 1292 1293 /* 1294 * ok, now that we've got the size info, we can alloc our framebuffer. 1295 */ 1296 info->fix = dlfb_fix; 1297 info->fix.line_length = var->xres * (var->bits_per_pixel / 8); 1298 videomemorysize = info->fix.line_length * var->yres; 1299 1300 /* 1301 * The big chunk of system memory we use as a virtual framebuffer. 1302 * TODO: Handle fbcon cursor code calling blit in interrupt context 1303 */ 1304 videomemory = vmalloc(videomemorysize); 1305 if (!videomemory) { 1306 retval = -ENOMEM; 1307 dl_err("Virtual framebuffer alloc failed\n"); 1308 goto error; 1309 } 1310 1311 info->screen_base = videomemory; 1312 info->fix.smem_len = PAGE_ALIGN(videomemorysize); 1313 info->fix.smem_start = (unsigned long) videomemory; 1314 info->flags = udlfb_info_flags; 1315 1316 1317 /* 1318 * Second framebuffer copy, mirroring the state of the framebuffer 1319 * on the physical USB device. We can function without this. 1320 * But with imperfect damage info we may end up sending pixels over USB 1321 * that were, in fact, unchanged -- wasting limited USB bandwidth 1322 */ 1323 dev->backing_buffer = vmalloc(videomemorysize); 1324 if (!dev->backing_buffer) 1325 dl_warn("No shadow/backing buffer allcoated\n"); 1326 else 1327 memset(dev->backing_buffer, 0, videomemorysize); 1328 1329 retval = fb_alloc_cmap(&info->cmap, 256, 0); 1330 if (retval < 0) { 1331 dl_err("fb_alloc_cmap failed %x\n", retval); 1332 goto error; 1333 } 1334 1335 /* ready to begin using device */ 1336 1337#ifdef CONFIG_FB_DEFERRED_IO 1338 atomic_set(&dev->use_defio, 1); 1339#endif 1340 atomic_set(&dev->usb_active, 1); 1341 dlfb_select_std_channel(dev); 1342 1343 dlfb_ops_check_var(var, info); 1344 dlfb_ops_set_par(info); 1345 1346 /* paint greenscreen */ 1347 pix_framebuffer = (u16 *) videomemory; 1348 for (i = 0; i < videomemorysize / 2; i++) 1349 pix_framebuffer[i] = 0x37e6; 1350 1351 dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres, 1352 videomemory); 1353 1354 retval = register_framebuffer(info); 1355 if (retval < 0) { 1356 dl_err("register_framebuffer failed %d\n", retval); 1357 goto error; 1358 } 1359 registered = 1; 1360 1361 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) 1362 device_create_file(info->dev, &fb_device_attrs[i]); 1363 1364 device_create_bin_file(info->dev, &edid_attr); 1365 1366 dl_err("DisplayLink USB device /dev/fb%d attached. %dx%d resolution." 1367 " Using %dK framebuffer memory\n", info->node, 1368 var->xres, var->yres, 1369 ((dev->backing_buffer) ? 1370 videomemorysize * 2 : videomemorysize) >> 10); 1371 return 0; 1372 1373error: 1374 if (dev) { 1375 if (registered) { 1376 unregister_framebuffer(info); 1377 dlfb_ops_destroy(info); 1378 } else 1379 kref_put(&dev->kref, dlfb_delete); 1380 1381 if (dev->urbs.count > 0) 1382 dlfb_free_urb_list(dev); 1383 kref_put(&dev->kref, dlfb_delete); /* last ref from kref_init */ 1384 1385 /* dev has been deallocated. Do not dereference */ 1386 } 1387 1388 return retval; 1389} 1390 1391static void dlfb_usb_disconnect(struct usb_interface *interface) 1392{ 1393 struct dlfb_data *dev; 1394 struct fb_info *info; 1395 int i; 1396 1397 dev = usb_get_intfdata(interface); 1398 info = dev->info; 1399 1400 /* when non-active we'll update virtual framebuffer, but no new urbs */ 1401 atomic_set(&dev->usb_active, 0); 1402 1403 usb_set_intfdata(interface, NULL); 1404 1405 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) 1406 device_remove_file(info->dev, &fb_device_attrs[i]); 1407 1408 device_remove_bin_file(info->dev, &edid_attr); 1409 1410 /* this function will wait for all in-flight urbs to complete */ 1411 dlfb_free_urb_list(dev); 1412 1413 if (info) { 1414 dl_notice("Detaching /dev/fb%d\n", info->node); 1415 unregister_framebuffer(info); 1416 dlfb_ops_destroy(info); 1417 } 1418 1419 /* release reference taken by kref_init in probe() */ 1420 kref_put(&dev->kref, dlfb_delete); 1421 1422 /* consider dlfb_data freed */ 1423 1424 return; 1425} 1426 1427static struct usb_driver dlfb_driver = { 1428 .name = "udlfb", 1429 .probe = dlfb_usb_probe, 1430 .disconnect = dlfb_usb_disconnect, 1431 .id_table = id_table, 1432}; 1433 1434static int __init dlfb_module_init(void) 1435{ 1436 int res; 1437 1438 res = usb_register(&dlfb_driver); 1439 if (res) 1440 err("usb_register failed. Error number %d", res); 1441 1442 printk(KERN_INFO "VMODES initialized\n"); 1443 1444 return res; 1445} 1446 1447static void __exit dlfb_module_exit(void) 1448{ 1449 usb_deregister(&dlfb_driver); 1450} 1451 1452module_init(dlfb_module_init); 1453module_exit(dlfb_module_exit); 1454 1455static void dlfb_urb_completion(struct urb *urb) 1456{ 1457 struct urb_node *unode = urb->context; 1458 struct dlfb_data *dev = unode->dev; 1459 unsigned long flags; 1460 1461 /* sync/async unlink faults aren't errors */ 1462 if (urb->status) { 1463 if (!(urb->status == -ENOENT || 1464 urb->status == -ECONNRESET || 1465 urb->status == -ESHUTDOWN)) { 1466 dl_err("%s - nonzero write bulk status received: %d\n", 1467 __func__, urb->status); 1468 atomic_set(&dev->lost_pixels, 1); 1469 } 1470 } 1471 1472 urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */ 1473 1474 spin_lock_irqsave(&dev->urbs.lock, flags); 1475 list_add_tail(&unode->entry, &dev->urbs.list); 1476 dev->urbs.available++; 1477 spin_unlock_irqrestore(&dev->urbs.lock, flags); 1478 1479 up(&dev->urbs.limit_sem); 1480} 1481 1482static void dlfb_free_urb_list(struct dlfb_data *dev) 1483{ 1484 int count = dev->urbs.count; 1485 struct list_head *node; 1486 struct urb_node *unode; 1487 struct urb *urb; 1488 int ret; 1489 unsigned long flags; 1490 1491 dl_notice("Waiting for completes and freeing all render urbs\n"); 1492 1493 /* keep waiting and freeing, until we've got 'em all */ 1494 while (count--) { 1495 /* Timeout means a memory leak and/or fault */ 1496 ret = down_timeout(&dev->urbs.limit_sem, FREE_URB_TIMEOUT); 1497 if (ret) { 1498 BUG_ON(ret); 1499 break; 1500 } 1501 spin_lock_irqsave(&dev->urbs.lock, flags); 1502 1503 node = dev->urbs.list.next; /* have reserved one with sem */ 1504 list_del_init(node); 1505 1506 spin_unlock_irqrestore(&dev->urbs.lock, flags); 1507 1508 unode = list_entry(node, struct urb_node, entry); 1509 urb = unode->urb; 1510 1511 /* Free each separately allocated piece */ 1512 usb_free_coherent(urb->dev, dev->urbs.size, 1513 urb->transfer_buffer, urb->transfer_dma); 1514 usb_free_urb(urb); 1515 kfree(node); 1516 } 1517 1518 kref_put(&dev->kref, dlfb_delete); 1519 1520} 1521 1522static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size) 1523{ 1524 int i = 0; 1525 struct urb *urb; 1526 struct urb_node *unode; 1527 char *buf; 1528 1529 spin_lock_init(&dev->urbs.lock); 1530 1531 dev->urbs.size = size; 1532 INIT_LIST_HEAD(&dev->urbs.list); 1533 1534 while (i < count) { 1535 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); 1536 if (!unode) 1537 break; 1538 unode->dev = dev; 1539 1540 urb = usb_alloc_urb(0, GFP_KERNEL); 1541 if (!urb) { 1542 kfree(unode); 1543 break; 1544 } 1545 unode->urb = urb; 1546 1547 buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL, 1548 &urb->transfer_dma); 1549 if (!buf) { 1550 kfree(unode); 1551 usb_free_urb(urb); 1552 break; 1553 } 1554 1555 /* urb->transfer_buffer_length set to actual before submit */ 1556 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1), 1557 buf, size, dlfb_urb_completion, unode); 1558 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1559 1560 list_add_tail(&unode->entry, &dev->urbs.list); 1561 1562 i++; 1563 } 1564 1565 sema_init(&dev->urbs.limit_sem, i); 1566 dev->urbs.count = i; 1567 dev->urbs.available = i; 1568 1569 kref_get(&dev->kref); /* released in free_render_urbs() */ 1570 1571 dl_notice("allocated %d %d byte urbs\n", i, (int) size); 1572 1573 return i; 1574} 1575 1576static struct urb *dlfb_get_urb(struct dlfb_data *dev) 1577{ 1578 int ret = 0; 1579 struct list_head *entry; 1580 struct urb_node *unode; 1581 struct urb *urb = NULL; 1582 unsigned long flags; 1583 1584 /* Wait for an in-flight buffer to complete and get re-queued */ 1585 ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT); 1586 if (ret) { 1587 atomic_set(&dev->lost_pixels, 1); 1588 dl_err("wait for urb interrupted: %x\n", ret); 1589 goto error; 1590 } 1591 1592 spin_lock_irqsave(&dev->urbs.lock, flags); 1593 1594 BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */ 1595 entry = dev->urbs.list.next; 1596 list_del_init(entry); 1597 dev->urbs.available--; 1598 1599 spin_unlock_irqrestore(&dev->urbs.lock, flags); 1600 1601 unode = list_entry(entry, struct urb_node, entry); 1602 urb = unode->urb; 1603 1604error: 1605 return urb; 1606} 1607 1608static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len) 1609{ 1610 int ret; 1611 1612 BUG_ON(len > dev->urbs.size); 1613 1614 urb->transfer_buffer_length = len; /* set to actual payload len */ 1615 ret = usb_submit_urb(urb, GFP_KERNEL); 1616 if (ret) { 1617 dlfb_urb_completion(urb); /* because no one else will */ 1618 atomic_set(&dev->lost_pixels, 1); 1619 dl_err("usb_submit_urb error %x\n", ret); 1620 } 1621 return ret; 1622} 1623 1624MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " 1625 "Jaya Kumar <jayakumar.lkml@gmail.com>, " 1626 "Bernie Thompson <bernie@plugable.com>"); 1627MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); 1628MODULE_LICENSE("GPL"); 1629