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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * udlfb.c -- Framebuffer driver for DisplayLink USB controller
4 *
5 * Copyright (C) 2009 Roberto De Ioris <[email protected]>
6 * Copyright (C) 2009 Jaya Kumar <[email protected]>
7 * Copyright (C) 2009 Bernie Thompson <[email protected]>
8 *
9 * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
10 * usb-skeleton by GregKH.
11 *
12 * Device-specific portions based on information from Displaylink, with work
13 * from Florian Echtler, Henrik Bjerregaard Pedersen, and others.
14 */
15
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/init.h>
19#include <linux/usb.h>
20#include <linux/uaccess.h>
21#include <linux/mm.h>
22#include <linux/fb.h>
23#include <linux/vmalloc.h>
24#include <linux/slab.h>
25#include <linux/delay.h>
26#include <linux/unaligned.h>
27#include <video/udlfb.h>
28#include "edid.h"
29
30#define OUT_EP_NUM 1 /* The endpoint number we will use */
31
32static const struct fb_fix_screeninfo dlfb_fix = {
33 .id = "udlfb",
34 .type = FB_TYPE_PACKED_PIXELS,
35 .visual = FB_VISUAL_TRUECOLOR,
36 .xpanstep = 0,
37 .ypanstep = 0,
38 .ywrapstep = 0,
39 .accel = FB_ACCEL_NONE,
40};
41
42static const u32 udlfb_info_flags = FBINFO_READS_FAST |
43 FBINFO_VIRTFB |
44 FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
45 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
46
47/*
48 * There are many DisplayLink-based graphics products, all with unique PIDs.
49 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
50 * We also require a match on SubClass (0x00) and Protocol (0x00),
51 * which is compatible with all known USB 2.0 era graphics chips and firmware,
52 * but allows DisplayLink to increment those for any future incompatible chips
53 */
54static const struct usb_device_id id_table[] = {
55 {.idVendor = 0x17e9,
56 .bInterfaceClass = 0xff,
57 .bInterfaceSubClass = 0x00,
58 .bInterfaceProtocol = 0x00,
59 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
60 USB_DEVICE_ID_MATCH_INT_CLASS |
61 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
62 USB_DEVICE_ID_MATCH_INT_PROTOCOL,
63 },
64 {},
65};
66MODULE_DEVICE_TABLE(usb, id_table);
67
68/* module options */
69static bool console = true; /* Allow fbcon to open framebuffer */
70static bool fb_defio = true; /* Detect mmap writes using page faults */
71static bool shadow = true; /* Optionally disable shadow framebuffer */
72static int pixel_limit; /* Optionally force a pixel resolution limit */
73
74struct dlfb_deferred_free {
75 struct list_head list;
76 void *mem;
77};
78
79static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len);
80
81/* dlfb keeps a list of urbs for efficient bulk transfers */
82static void dlfb_urb_completion(struct urb *urb);
83static struct urb *dlfb_get_urb(struct dlfb_data *dlfb);
84static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len);
85static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size);
86static void dlfb_free_urb_list(struct dlfb_data *dlfb);
87
88/*
89 * All DisplayLink bulk operations start with 0xAF, followed by specific code
90 * All operations are written to buffers which then later get sent to device
91 */
92static char *dlfb_set_register(char *buf, u8 reg, u8 val)
93{
94 *buf++ = 0xAF;
95 *buf++ = 0x20;
96 *buf++ = reg;
97 *buf++ = val;
98 return buf;
99}
100
101static char *dlfb_vidreg_lock(char *buf)
102{
103 return dlfb_set_register(buf, 0xFF, 0x00);
104}
105
106static char *dlfb_vidreg_unlock(char *buf)
107{
108 return dlfb_set_register(buf, 0xFF, 0xFF);
109}
110
111/*
112 * Map FB_BLANK_* to DisplayLink register
113 * DLReg FB_BLANK_*
114 * ----- -----------------------------
115 * 0x00 FB_BLANK_UNBLANK (0)
116 * 0x01 FB_BLANK (1)
117 * 0x03 FB_BLANK_VSYNC_SUSPEND (2)
118 * 0x05 FB_BLANK_HSYNC_SUSPEND (3)
119 * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back
120 */
121static char *dlfb_blanking(char *buf, int fb_blank)
122{
123 u8 reg;
124
125 switch (fb_blank) {
126 case FB_BLANK_POWERDOWN:
127 reg = 0x07;
128 break;
129 case FB_BLANK_HSYNC_SUSPEND:
130 reg = 0x05;
131 break;
132 case FB_BLANK_VSYNC_SUSPEND:
133 reg = 0x03;
134 break;
135 case FB_BLANK_NORMAL:
136 reg = 0x01;
137 break;
138 default:
139 reg = 0x00;
140 }
141
142 buf = dlfb_set_register(buf, 0x1F, reg);
143
144 return buf;
145}
146
147static char *dlfb_set_color_depth(char *buf, u8 selection)
148{
149 return dlfb_set_register(buf, 0x00, selection);
150}
151
152static char *dlfb_set_base16bpp(char *wrptr, u32 base)
153{
154 /* the base pointer is 16 bits wide, 0x20 is hi byte. */
155 wrptr = dlfb_set_register(wrptr, 0x20, base >> 16);
156 wrptr = dlfb_set_register(wrptr, 0x21, base >> 8);
157 return dlfb_set_register(wrptr, 0x22, base);
158}
159
160/*
161 * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
162 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
163 */
164static char *dlfb_set_base8bpp(char *wrptr, u32 base)
165{
166 wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);
167 wrptr = dlfb_set_register(wrptr, 0x27, base >> 8);
168 return dlfb_set_register(wrptr, 0x28, base);
169}
170
171static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value)
172{
173 wrptr = dlfb_set_register(wrptr, reg, value >> 8);
174 return dlfb_set_register(wrptr, reg+1, value);
175}
176
177/*
178 * This is kind of weird because the controller takes some
179 * register values in a different byte order than other registers.
180 */
181static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)
182{
183 wrptr = dlfb_set_register(wrptr, reg, value);
184 return dlfb_set_register(wrptr, reg+1, value >> 8);
185}
186
187/*
188 * LFSR is linear feedback shift register. The reason we have this is
189 * because the display controller needs to minimize the clock depth of
190 * various counters used in the display path. So this code reverses the
191 * provided value into the lfsr16 value by counting backwards to get
192 * the value that needs to be set in the hardware comparator to get the
193 * same actual count. This makes sense once you read above a couple of
194 * times and think about it from a hardware perspective.
195 */
196static u16 dlfb_lfsr16(u16 actual_count)
197{
198 u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
199
200 while (actual_count--) {
201 lv = ((lv << 1) |
202 (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
203 & 0xFFFF;
204 }
205
206 return (u16) lv;
207}
208
209/*
210 * This does LFSR conversion on the value that is to be written.
211 * See LFSR explanation above for more detail.
212 */
213static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
214{
215 return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));
216}
217
218/*
219 * This takes a standard fbdev screeninfo struct and all of its monitor mode
220 * details and converts them into the DisplayLink equivalent register commands.
221 */
222static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var)
223{
224 u16 xds, yds;
225 u16 xde, yde;
226 u16 yec;
227
228 /* x display start */
229 xds = var->left_margin + var->hsync_len;
230 wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);
231 /* x display end */
232 xde = xds + var->xres;
233 wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);
234
235 /* y display start */
236 yds = var->upper_margin + var->vsync_len;
237 wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);
238 /* y display end */
239 yde = yds + var->yres;
240 wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);
241
242 /* x end count is active + blanking - 1 */
243 wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,
244 xde + var->right_margin - 1);
245
246 /* libdlo hardcodes hsync start to 1 */
247 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);
248
249 /* hsync end is width of sync pulse + 1 */
250 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
251
252 /* hpixels is active pixels */
253 wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);
254
255 /* yendcount is vertical active + vertical blanking */
256 yec = var->yres + var->upper_margin + var->lower_margin +
257 var->vsync_len;
258 wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
259
260 /* libdlo hardcodes vsync start to 0 */
261 wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
262
263 /* vsync end is width of vsync pulse */
264 wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);
265
266 /* vpixels is active pixels */
267 wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);
268
269 /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */
270 wrptr = dlfb_set_register_16be(wrptr, 0x1B,
271 200*1000*1000/var->pixclock);
272
273 return wrptr;
274}
275
276/*
277 * This takes a standard fbdev screeninfo struct that was fetched or prepared
278 * and then generates the appropriate command sequence that then drives the
279 * display controller.
280 */
281static int dlfb_set_video_mode(struct dlfb_data *dlfb,
282 struct fb_var_screeninfo *var)
283{
284 char *buf;
285 char *wrptr;
286 int retval;
287 int writesize;
288 struct urb *urb;
289
290 if (!atomic_read(&dlfb->usb_active))
291 return -EPERM;
292
293 urb = dlfb_get_urb(dlfb);
294 if (!urb)
295 return -ENOMEM;
296
297 buf = (char *) urb->transfer_buffer;
298
299 /*
300 * This first section has to do with setting the base address on the
301 * controller * associated with the display. There are 2 base
302 * pointers, currently, we only * use the 16 bpp segment.
303 */
304 wrptr = dlfb_vidreg_lock(buf);
305 wrptr = dlfb_set_color_depth(wrptr, 0x00);
306 /* set base for 16bpp segment to 0 */
307 wrptr = dlfb_set_base16bpp(wrptr, 0);
308 /* set base for 8bpp segment to end of fb */
309 wrptr = dlfb_set_base8bpp(wrptr, dlfb->info->fix.smem_len);
310
311 wrptr = dlfb_set_vid_cmds(wrptr, var);
312 wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK);
313 wrptr = dlfb_vidreg_unlock(wrptr);
314
315 writesize = wrptr - buf;
316
317 retval = dlfb_submit_urb(dlfb, urb, writesize);
318
319 dlfb->blank_mode = FB_BLANK_UNBLANK;
320
321 return retval;
322}
323
324static void dlfb_vm_open(struct vm_area_struct *vma)
325{
326 struct dlfb_data *dlfb = vma->vm_private_data;
327
328 atomic_inc(&dlfb->mmap_count);
329}
330
331static void dlfb_vm_close(struct vm_area_struct *vma)
332{
333 struct dlfb_data *dlfb = vma->vm_private_data;
334
335 atomic_dec(&dlfb->mmap_count);
336}
337
338static const struct vm_operations_struct dlfb_vm_ops = {
339 .open = dlfb_vm_open,
340 .close = dlfb_vm_close,
341};
342
343static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
344{
345 unsigned long start = vma->vm_start;
346 unsigned long size = vma->vm_end - vma->vm_start;
347 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
348 unsigned long page, pos;
349 struct dlfb_data *dlfb = info->par;
350
351 if (info->fbdefio)
352 return fb_deferred_io_mmap(info, vma);
353
354 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
355
356 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
357 return -EINVAL;
358 if (size > info->fix.smem_len)
359 return -EINVAL;
360 if (offset > info->fix.smem_len - size)
361 return -EINVAL;
362
363 pos = (unsigned long)info->fix.smem_start + offset;
364
365 dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n",
366 pos, size);
367
368 while (size > 0) {
369 page = vmalloc_to_pfn((void *)pos);
370 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
371 return -EAGAIN;
372
373 start += PAGE_SIZE;
374 pos += PAGE_SIZE;
375 if (size > PAGE_SIZE)
376 size -= PAGE_SIZE;
377 else
378 size = 0;
379 }
380
381 vma->vm_ops = &dlfb_vm_ops;
382 vma->vm_private_data = dlfb;
383 atomic_inc(&dlfb->mmap_count);
384 return 0;
385}
386
387/*
388 * Trims identical data from front and back of line
389 * Sets new front buffer address and width
390 * And returns byte count of identical pixels
391 * Assumes CPU natural alignment (unsigned long)
392 * for back and front buffer ptrs and width
393 */
394static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)
395{
396 int j, k;
397 const unsigned long *back = (const unsigned long *) bback;
398 const unsigned long *front = (const unsigned long *) *bfront;
399 const int width = *width_bytes / sizeof(unsigned long);
400 int identical;
401 int start = width;
402 int end = width;
403
404 for (j = 0; j < width; j++) {
405 if (back[j] != front[j]) {
406 start = j;
407 break;
408 }
409 }
410
411 for (k = width - 1; k > j; k--) {
412 if (back[k] != front[k]) {
413 end = k+1;
414 break;
415 }
416 }
417
418 identical = start + (width - end);
419 *bfront = (u8 *) &front[start];
420 *width_bytes = (end - start) * sizeof(unsigned long);
421
422 return identical * sizeof(unsigned long);
423}
424
425/*
426 * Render a command stream for an encoded horizontal line segment of pixels.
427 *
428 * A command buffer holds several commands.
429 * It always begins with a fresh command header
430 * (the protocol doesn't require this, but we enforce it to allow
431 * multiple buffers to be potentially encoded and sent in parallel).
432 * A single command encodes one contiguous horizontal line of pixels
433 *
434 * The function relies on the client to do all allocation, so that
435 * rendering can be done directly to output buffers (e.g. USB URBs).
436 * The function fills the supplied command buffer, providing information
437 * on where it left off, so the client may call in again with additional
438 * buffers if the line will take several buffers to complete.
439 *
440 * A single command can transmit a maximum of 256 pixels,
441 * regardless of the compression ratio (protocol design limit).
442 * To the hardware, 0 for a size byte means 256
443 *
444 * Rather than 256 pixel commands which are either rl or raw encoded,
445 * the rlx command simply assumes alternating raw and rl spans within one cmd.
446 * This has a slightly larger header overhead, but produces more even results.
447 * It also processes all data (read and write) in a single pass.
448 * Performance benchmarks of common cases show it having just slightly better
449 * compression than 256 pixel raw or rle commands, with similar CPU consumpion.
450 * But for very rl friendly data, will compress not quite as well.
451 */
452static void dlfb_compress_hline(
453 const uint16_t **pixel_start_ptr,
454 const uint16_t *const pixel_end,
455 uint32_t *device_address_ptr,
456 uint8_t **command_buffer_ptr,
457 const uint8_t *const cmd_buffer_end,
458 unsigned long back_buffer_offset,
459 int *ident_ptr)
460{
461 const uint16_t *pixel = *pixel_start_ptr;
462 uint32_t dev_addr = *device_address_ptr;
463 uint8_t *cmd = *command_buffer_ptr;
464
465 while ((pixel_end > pixel) &&
466 (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
467 uint8_t *raw_pixels_count_byte = NULL;
468 uint8_t *cmd_pixels_count_byte = NULL;
469 const uint16_t *raw_pixel_start = NULL;
470 const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL;
471
472 if (back_buffer_offset &&
473 *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) {
474 pixel++;
475 dev_addr += BPP;
476 (*ident_ptr)++;
477 continue;
478 }
479
480 *cmd++ = 0xAF;
481 *cmd++ = 0x6B;
482 *cmd++ = dev_addr >> 16;
483 *cmd++ = dev_addr >> 8;
484 *cmd++ = dev_addr;
485
486 cmd_pixels_count_byte = cmd++; /* we'll know this later */
487 cmd_pixel_start = pixel;
488
489 raw_pixels_count_byte = cmd++; /* we'll know this later */
490 raw_pixel_start = pixel;
491
492 cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL,
493 (unsigned long)(pixel_end - pixel),
494 (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP);
495
496 if (back_buffer_offset) {
497 /* note: the framebuffer may change under us, so we must test for underflow */
498 while (cmd_pixel_end - 1 > pixel &&
499 *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset))
500 cmd_pixel_end--;
501 }
502
503 while (pixel < cmd_pixel_end) {
504 const uint16_t * const repeating_pixel = pixel;
505 u16 pixel_value = *pixel;
506
507 put_unaligned_be16(pixel_value, cmd);
508 if (back_buffer_offset)
509 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value;
510 cmd += 2;
511 pixel++;
512
513 if (unlikely((pixel < cmd_pixel_end) &&
514 (*pixel == pixel_value))) {
515 /* go back and fill in raw pixel count */
516 *raw_pixels_count_byte = ((repeating_pixel -
517 raw_pixel_start) + 1) & 0xFF;
518
519 do {
520 if (back_buffer_offset)
521 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value;
522 pixel++;
523 } while ((pixel < cmd_pixel_end) &&
524 (*pixel == pixel_value));
525
526 /* immediately after raw data is repeat byte */
527 *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF;
528
529 /* Then start another raw pixel span */
530 raw_pixel_start = pixel;
531 raw_pixels_count_byte = cmd++;
532 }
533 }
534
535 if (pixel > raw_pixel_start) {
536 /* finalize last RAW span */
537 *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF;
538 } else {
539 /* undo unused byte */
540 cmd--;
541 }
542
543 *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF;
544 dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start;
545 }
546
547 if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) {
548 /* Fill leftover bytes with no-ops */
549 if (cmd_buffer_end > cmd)
550 memset(cmd, 0xAF, cmd_buffer_end - cmd);
551 cmd = (uint8_t *) cmd_buffer_end;
552 }
553
554 *command_buffer_ptr = cmd;
555 *pixel_start_ptr = pixel;
556 *device_address_ptr = dev_addr;
557}
558
559/*
560 * There are 3 copies of every pixel: The front buffer that the fbdev
561 * client renders to, the actual framebuffer across the USB bus in hardware
562 * (that we can only write to, slowly, and can never read), and (optionally)
563 * our shadow copy that tracks what's been sent to that hardware buffer.
564 */
565static int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr,
566 const char *front, char **urb_buf_ptr,
567 u32 byte_offset, u32 byte_width,
568 int *ident_ptr, int *sent_ptr)
569{
570 const u8 *line_start, *line_end, *next_pixel;
571 u32 dev_addr = dlfb->base16 + byte_offset;
572 struct urb *urb = *urb_ptr;
573 u8 *cmd = *urb_buf_ptr;
574 u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length;
575 unsigned long back_buffer_offset = 0;
576
577 line_start = (u8 *) (front + byte_offset);
578 next_pixel = line_start;
579 line_end = next_pixel + byte_width;
580
581 if (dlfb->backing_buffer) {
582 int offset;
583 const u8 *back_start = (u8 *) (dlfb->backing_buffer
584 + byte_offset);
585
586 back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start;
587
588 *ident_ptr += dlfb_trim_hline(back_start, &next_pixel,
589 &byte_width);
590
591 offset = next_pixel - line_start;
592 line_end = next_pixel + byte_width;
593 dev_addr += offset;
594 back_start += offset;
595 line_start += offset;
596 }
597
598 while (next_pixel < line_end) {
599
600 dlfb_compress_hline((const uint16_t **) &next_pixel,
601 (const uint16_t *) line_end, &dev_addr,
602 (u8 **) &cmd, (u8 *) cmd_end, back_buffer_offset,
603 ident_ptr);
604
605 if (cmd >= cmd_end) {
606 int len = cmd - (u8 *) urb->transfer_buffer;
607 if (dlfb_submit_urb(dlfb, urb, len))
608 return 1; /* lost pixels is set */
609 *sent_ptr += len;
610 urb = dlfb_get_urb(dlfb);
611 if (!urb)
612 return 1; /* lost_pixels is set */
613 *urb_ptr = urb;
614 cmd = urb->transfer_buffer;
615 cmd_end = &cmd[urb->transfer_buffer_length];
616 }
617 }
618
619 *urb_buf_ptr = cmd;
620
621 return 0;
622}
623
624static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height)
625{
626 int i, ret;
627 char *cmd;
628 cycles_t start_cycles, end_cycles;
629 int bytes_sent = 0;
630 int bytes_identical = 0;
631 struct urb *urb;
632 int aligned_x;
633
634 start_cycles = get_cycles();
635
636 mutex_lock(&dlfb->render_mutex);
637
638 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
639 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
640 x = aligned_x;
641
642 if ((width <= 0) ||
643 (x + width > dlfb->info->var.xres) ||
644 (y + height > dlfb->info->var.yres)) {
645 ret = -EINVAL;
646 goto unlock_ret;
647 }
648
649 if (!atomic_read(&dlfb->usb_active)) {
650 ret = 0;
651 goto unlock_ret;
652 }
653
654 urb = dlfb_get_urb(dlfb);
655 if (!urb) {
656 ret = 0;
657 goto unlock_ret;
658 }
659 cmd = urb->transfer_buffer;
660
661 for (i = y; i < y + height ; i++) {
662 const int line_offset = dlfb->info->fix.line_length * i;
663 const int byte_offset = line_offset + (x * BPP);
664
665 if (dlfb_render_hline(dlfb, &urb,
666 (char *) dlfb->info->fix.smem_start,
667 &cmd, byte_offset, width * BPP,
668 &bytes_identical, &bytes_sent))
669 goto error;
670 }
671
672 if (cmd > (char *) urb->transfer_buffer) {
673 int len;
674 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
675 *cmd++ = 0xAF;
676 /* Send partial buffer remaining before exiting */
677 len = cmd - (char *) urb->transfer_buffer;
678 dlfb_submit_urb(dlfb, urb, len);
679 bytes_sent += len;
680 } else
681 dlfb_urb_completion(urb);
682
683error:
684 atomic_add(bytes_sent, &dlfb->bytes_sent);
685 atomic_add(bytes_identical, &dlfb->bytes_identical);
686 atomic_add(width*height*2, &dlfb->bytes_rendered);
687 end_cycles = get_cycles();
688 atomic_add(((unsigned int) ((end_cycles - start_cycles)
689 >> 10)), /* Kcycles */
690 &dlfb->cpu_kcycles_used);
691
692 ret = 0;
693
694unlock_ret:
695 mutex_unlock(&dlfb->render_mutex);
696 return ret;
697}
698
699static void dlfb_init_damage(struct dlfb_data *dlfb)
700{
701 dlfb->damage_x = INT_MAX;
702 dlfb->damage_x2 = 0;
703 dlfb->damage_y = INT_MAX;
704 dlfb->damage_y2 = 0;
705}
706
707static void dlfb_damage_work(struct work_struct *w)
708{
709 struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work);
710 int x, x2, y, y2;
711
712 spin_lock_irq(&dlfb->damage_lock);
713 x = dlfb->damage_x;
714 x2 = dlfb->damage_x2;
715 y = dlfb->damage_y;
716 y2 = dlfb->damage_y2;
717 dlfb_init_damage(dlfb);
718 spin_unlock_irq(&dlfb->damage_lock);
719
720 if (x < x2 && y < y2)
721 dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y);
722}
723
724static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height)
725{
726 unsigned long flags;
727 int x2 = x + width;
728 int y2 = y + height;
729
730 if (x >= x2 || y >= y2)
731 return;
732
733 spin_lock_irqsave(&dlfb->damage_lock, flags);
734 dlfb->damage_x = min(x, dlfb->damage_x);
735 dlfb->damage_x2 = max(x2, dlfb->damage_x2);
736 dlfb->damage_y = min(y, dlfb->damage_y);
737 dlfb->damage_y2 = max(y2, dlfb->damage_y2);
738 spin_unlock_irqrestore(&dlfb->damage_lock, flags);
739
740 schedule_work(&dlfb->damage_work);
741}
742
743/*
744 * NOTE: fb_defio.c is holding info->fbdefio.mutex
745 * Touching ANY framebuffer memory that triggers a page fault
746 * in fb_defio will cause a deadlock, when it also tries to
747 * grab the same mutex.
748 */
749static void dlfb_dpy_deferred_io(struct fb_info *info, struct list_head *pagereflist)
750{
751 struct fb_deferred_io_pageref *pageref;
752 struct dlfb_data *dlfb = info->par;
753 struct urb *urb;
754 char *cmd;
755 cycles_t start_cycles, end_cycles;
756 int bytes_sent = 0;
757 int bytes_identical = 0;
758 int bytes_rendered = 0;
759
760 mutex_lock(&dlfb->render_mutex);
761
762 if (!fb_defio)
763 goto unlock_ret;
764
765 if (!atomic_read(&dlfb->usb_active))
766 goto unlock_ret;
767
768 start_cycles = get_cycles();
769
770 urb = dlfb_get_urb(dlfb);
771 if (!urb)
772 goto unlock_ret;
773
774 cmd = urb->transfer_buffer;
775
776 /* walk the written page list and render each to device */
777 list_for_each_entry(pageref, pagereflist, list) {
778 if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start,
779 &cmd, pageref->offset, PAGE_SIZE,
780 &bytes_identical, &bytes_sent))
781 goto error;
782 bytes_rendered += PAGE_SIZE;
783 }
784
785 if (cmd > (char *) urb->transfer_buffer) {
786 int len;
787 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
788 *cmd++ = 0xAF;
789 /* Send partial buffer remaining before exiting */
790 len = cmd - (char *) urb->transfer_buffer;
791 dlfb_submit_urb(dlfb, urb, len);
792 bytes_sent += len;
793 } else
794 dlfb_urb_completion(urb);
795
796error:
797 atomic_add(bytes_sent, &dlfb->bytes_sent);
798 atomic_add(bytes_identical, &dlfb->bytes_identical);
799 atomic_add(bytes_rendered, &dlfb->bytes_rendered);
800 end_cycles = get_cycles();
801 atomic_add(((unsigned int) ((end_cycles - start_cycles)
802 >> 10)), /* Kcycles */
803 &dlfb->cpu_kcycles_used);
804unlock_ret:
805 mutex_unlock(&dlfb->render_mutex);
806}
807
808static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len)
809{
810 int i, ret;
811 char *rbuf;
812
813 rbuf = kmalloc(2, GFP_KERNEL);
814 if (!rbuf)
815 return 0;
816
817 for (i = 0; i < len; i++) {
818 ret = usb_control_msg(dlfb->udev,
819 usb_rcvctrlpipe(dlfb->udev, 0), 0x02,
820 (0x80 | (0x02 << 5)), i << 8, 0xA1,
821 rbuf, 2, USB_CTRL_GET_TIMEOUT);
822 if (ret < 2) {
823 dev_err(&dlfb->udev->dev,
824 "Read EDID byte %d failed: %d\n", i, ret);
825 i--;
826 break;
827 }
828 edid[i] = rbuf[1];
829 }
830
831 kfree(rbuf);
832
833 return i;
834}
835
836static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
837 unsigned long arg)
838{
839
840 struct dlfb_data *dlfb = info->par;
841
842 if (!atomic_read(&dlfb->usb_active))
843 return 0;
844
845 /* TODO: Update X server to get this from sysfs instead */
846 if (cmd == DLFB_IOCTL_RETURN_EDID) {
847 void __user *edid = (void __user *)arg;
848 if (copy_to_user(edid, dlfb->edid, dlfb->edid_size))
849 return -EFAULT;
850 return 0;
851 }
852
853 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */
854 if (cmd == DLFB_IOCTL_REPORT_DAMAGE) {
855 struct dloarea area;
856
857 if (copy_from_user(&area, (void __user *)arg,
858 sizeof(struct dloarea)))
859 return -EFAULT;
860
861 /*
862 * If we have a damage-aware client, turn fb_defio "off"
863 * To avoid perf imact of unnecessary page fault handling.
864 * Done by resetting the delay for this fb_info to a very
865 * long period. Pages will become writable and stay that way.
866 * Reset to normal value when all clients have closed this fb.
867 */
868 if (info->fbdefio)
869 info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE;
870
871 if (area.x < 0)
872 area.x = 0;
873
874 if (area.x > info->var.xres)
875 area.x = info->var.xres;
876
877 if (area.y < 0)
878 area.y = 0;
879
880 if (area.y > info->var.yres)
881 area.y = info->var.yres;
882
883 dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h);
884 }
885
886 return 0;
887}
888
889/* taken from vesafb */
890static int
891dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
892 unsigned blue, unsigned transp, struct fb_info *info)
893{
894 int err = 0;
895
896 if (regno >= info->cmap.len)
897 return 1;
898
899 if (regno < 16) {
900 if (info->var.red.offset == 10) {
901 /* 1:5:5:5 */
902 ((u32 *) (info->pseudo_palette))[regno] =
903 ((red & 0xf800) >> 1) |
904 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
905 } else {
906 /* 0:5:6:5 */
907 ((u32 *) (info->pseudo_palette))[regno] =
908 ((red & 0xf800)) |
909 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
910 }
911 }
912
913 return err;
914}
915
916/*
917 * It's common for several clients to have framebuffer open simultaneously.
918 * e.g. both fbcon and X. Makes things interesting.
919 * Assumes caller is holding info->lock (for open and release at least)
920 */
921static int dlfb_ops_open(struct fb_info *info, int user)
922{
923 struct dlfb_data *dlfb = info->par;
924
925 /*
926 * fbcon aggressively connects to first framebuffer it finds,
927 * preventing other clients (X) from working properly. Usually
928 * not what the user wants. Fail by default with option to enable.
929 */
930 if ((user == 0) && (!console))
931 return -EBUSY;
932
933 /* If the USB device is gone, we don't accept new opens */
934 if (dlfb->virtualized)
935 return -ENODEV;
936
937 dlfb->fb_count++;
938
939 if (fb_defio && (info->fbdefio == NULL)) {
940 /* enable defio at last moment if not disabled by client */
941
942 struct fb_deferred_io *fbdefio;
943
944 fbdefio = kzalloc_obj(struct fb_deferred_io);
945
946 if (fbdefio) {
947 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
948 fbdefio->sort_pagereflist = true;
949 fbdefio->deferred_io = dlfb_dpy_deferred_io;
950 }
951
952 info->fbdefio = fbdefio;
953 fb_deferred_io_init(info);
954 }
955
956 dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n",
957 user, info, dlfb->fb_count);
958
959 return 0;
960}
961
962static void dlfb_ops_destroy(struct fb_info *info)
963{
964 struct dlfb_data *dlfb = info->par;
965
966 cancel_work_sync(&dlfb->damage_work);
967
968 mutex_destroy(&dlfb->render_mutex);
969
970 if (info->cmap.len != 0)
971 fb_dealloc_cmap(&info->cmap);
972 if (info->monspecs.modedb)
973 fb_destroy_modedb(info->monspecs.modedb);
974 vfree(info->screen_buffer);
975
976 fb_destroy_modelist(&info->modelist);
977
978 while (!list_empty(&dlfb->deferred_free)) {
979 struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list);
980 list_del(&d->list);
981 vfree(d->mem);
982 kfree(d);
983 }
984 vfree(dlfb->backing_buffer);
985 kfree(dlfb->edid);
986 dlfb_free_urb_list(dlfb);
987 usb_put_dev(dlfb->udev);
988 kfree(dlfb);
989
990 /* Assume info structure is freed after this point */
991 framebuffer_release(info);
992}
993
994/*
995 * Assumes caller is holding info->lock mutex (for open and release at least)
996 */
997static int dlfb_ops_release(struct fb_info *info, int user)
998{
999 struct dlfb_data *dlfb = info->par;
1000
1001 dlfb->fb_count--;
1002
1003 if ((dlfb->fb_count == 0) && (info->fbdefio)) {
1004 fb_deferred_io_cleanup(info);
1005 kfree(info->fbdefio);
1006 info->fbdefio = NULL;
1007 }
1008
1009 dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count);
1010
1011 return 0;
1012}
1013
1014/*
1015 * Check whether a video mode is supported by the DisplayLink chip
1016 * We start from monitor's modes, so don't need to filter that here
1017 */
1018static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb)
1019{
1020 if (mode->xres * mode->yres > dlfb->sku_pixel_limit)
1021 return 0;
1022
1023 return 1;
1024}
1025
1026static void dlfb_var_color_format(struct fb_var_screeninfo *var)
1027{
1028 const struct fb_bitfield red = { 11, 5, 0 };
1029 const struct fb_bitfield green = { 5, 6, 0 };
1030 const struct fb_bitfield blue = { 0, 5, 0 };
1031
1032 var->bits_per_pixel = 16;
1033 var->red = red;
1034 var->green = green;
1035 var->blue = blue;
1036}
1037
1038static int dlfb_ops_check_var(struct fb_var_screeninfo *var,
1039 struct fb_info *info)
1040{
1041 struct fb_videomode mode;
1042 struct dlfb_data *dlfb = info->par;
1043
1044 if (!var->pixclock)
1045 return -EINVAL;
1046
1047 /* set device-specific elements of var unrelated to mode */
1048 dlfb_var_color_format(var);
1049
1050 fb_var_to_videomode(&mode, var);
1051
1052 if (!dlfb_is_valid_mode(&mode, dlfb))
1053 return -EINVAL;
1054
1055 return 0;
1056}
1057
1058static int dlfb_ops_set_par(struct fb_info *info)
1059{
1060 struct dlfb_data *dlfb = info->par;
1061 int result;
1062 u16 *pix_framebuffer;
1063 int i;
1064 struct fb_var_screeninfo fvs;
1065 u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8);
1066
1067 /* clear the activate field because it causes spurious miscompares */
1068 fvs = info->var;
1069 fvs.activate = 0;
1070 fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN;
1071
1072 if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo)))
1073 return 0;
1074
1075 result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length);
1076 if (result)
1077 return result;
1078
1079 result = dlfb_set_video_mode(dlfb, &info->var);
1080
1081 if (result)
1082 return result;
1083
1084 dlfb->current_mode = fvs;
1085 info->fix.line_length = line_length;
1086
1087 if (dlfb->fb_count == 0) {
1088
1089 /* paint greenscreen */
1090
1091 pix_framebuffer = (u16 *)info->screen_buffer;
1092 for (i = 0; i < info->fix.smem_len / 2; i++)
1093 pix_framebuffer[i] = 0x37e6;
1094 }
1095
1096 dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres);
1097
1098 return 0;
1099}
1100
1101/* To fonzi the jukebox (e.g. make blanking changes take effect) */
1102static char *dlfb_dummy_render(char *buf)
1103{
1104 *buf++ = 0xAF;
1105 *buf++ = 0x6A; /* copy */
1106 *buf++ = 0x00; /* from address*/
1107 *buf++ = 0x00;
1108 *buf++ = 0x00;
1109 *buf++ = 0x01; /* one pixel */
1110 *buf++ = 0x00; /* to address */
1111 *buf++ = 0x00;
1112 *buf++ = 0x00;
1113 return buf;
1114}
1115
1116/*
1117 * In order to come back from full DPMS off, we need to set the mode again
1118 */
1119static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
1120{
1121 struct dlfb_data *dlfb = info->par;
1122 char *bufptr;
1123 struct urb *urb;
1124
1125 dev_dbg(info->dev, "blank, mode %d --> %d\n",
1126 dlfb->blank_mode, blank_mode);
1127
1128 if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) &&
1129 (blank_mode != FB_BLANK_POWERDOWN)) {
1130
1131 /* returning from powerdown requires a fresh modeset */
1132 dlfb_set_video_mode(dlfb, &info->var);
1133 }
1134
1135 urb = dlfb_get_urb(dlfb);
1136 if (!urb)
1137 return 0;
1138
1139 bufptr = (char *) urb->transfer_buffer;
1140 bufptr = dlfb_vidreg_lock(bufptr);
1141 bufptr = dlfb_blanking(bufptr, blank_mode);
1142 bufptr = dlfb_vidreg_unlock(bufptr);
1143
1144 /* seems like a render op is needed to have blank change take effect */
1145 bufptr = dlfb_dummy_render(bufptr);
1146
1147 dlfb_submit_urb(dlfb, urb, bufptr -
1148 (char *) urb->transfer_buffer);
1149
1150 dlfb->blank_mode = blank_mode;
1151
1152 return 0;
1153}
1154
1155static void dlfb_ops_damage_range(struct fb_info *info, off_t off, size_t len)
1156{
1157 struct dlfb_data *dlfb = info->par;
1158 int start = max((int)(off / info->fix.line_length), 0);
1159 int lines = min((u32)((len / info->fix.line_length) + 1), (u32)info->var.yres);
1160
1161 dlfb_handle_damage(dlfb, 0, start, info->var.xres, lines);
1162}
1163
1164static void dlfb_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height)
1165{
1166 struct dlfb_data *dlfb = info->par;
1167
1168 dlfb_offload_damage(dlfb, x, y, width, height);
1169}
1170
1171FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(dlfb_ops,
1172 dlfb_ops_damage_range,
1173 dlfb_ops_damage_area)
1174
1175static const struct fb_ops dlfb_ops = {
1176 .owner = THIS_MODULE,
1177 __FB_DEFAULT_DEFERRED_OPS_RDWR(dlfb_ops),
1178 .fb_setcolreg = dlfb_ops_setcolreg,
1179 __FB_DEFAULT_DEFERRED_OPS_DRAW(dlfb_ops),
1180 .fb_mmap = dlfb_ops_mmap,
1181 .fb_ioctl = dlfb_ops_ioctl,
1182 .fb_open = dlfb_ops_open,
1183 .fb_release = dlfb_ops_release,
1184 .fb_blank = dlfb_ops_blank,
1185 .fb_check_var = dlfb_ops_check_var,
1186 .fb_set_par = dlfb_ops_set_par,
1187 .fb_destroy = dlfb_ops_destroy,
1188};
1189
1190
1191static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem)
1192{
1193 struct dlfb_deferred_free *d = kmalloc_obj(struct dlfb_deferred_free);
1194 if (!d)
1195 return;
1196 d->mem = mem;
1197 list_add(&d->list, &dlfb->deferred_free);
1198}
1199
1200/*
1201 * Assumes &info->lock held by caller
1202 */
1203static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len)
1204{
1205 u32 old_len = info->fix.smem_len;
1206 const void *old_fb = info->screen_buffer;
1207 unsigned char *new_fb;
1208 unsigned char *new_back = NULL;
1209
1210 new_len = PAGE_ALIGN(new_len);
1211
1212 if (new_len > old_len) {
1213 if (atomic_read(&dlfb->mmap_count) > 0) {
1214 dev_warn(info->dev,
1215 "refusing realloc: %d active mmaps\n",
1216 atomic_read(&dlfb->mmap_count));
1217 return -EBUSY;
1218 }
1219
1220 /*
1221 * Alloc system memory for virtual framebuffer
1222 */
1223 new_fb = vmalloc(new_len);
1224 if (!new_fb) {
1225 dev_err(info->dev, "Virtual framebuffer alloc failed\n");
1226 return -ENOMEM;
1227 }
1228 memset(new_fb, 0xff, new_len);
1229
1230 if (info->screen_buffer) {
1231 memcpy(new_fb, old_fb, old_len);
1232 dlfb_deferred_vfree(dlfb, info->screen_buffer);
1233 }
1234
1235 info->screen_buffer = new_fb;
1236 info->fix.smem_len = new_len;
1237 info->fix.smem_start = (unsigned long) new_fb;
1238 info->flags = udlfb_info_flags;
1239
1240 /*
1241 * Second framebuffer copy to mirror the framebuffer state
1242 * on the physical USB device. We can function without this.
1243 * But with imperfect damage info we may send pixels over USB
1244 * that were, in fact, unchanged - wasting limited USB bandwidth
1245 */
1246 if (shadow)
1247 new_back = vzalloc(new_len);
1248 if (!new_back)
1249 dev_info(info->dev,
1250 "No shadow/backing buffer allocated\n");
1251 else {
1252 dlfb_deferred_vfree(dlfb, dlfb->backing_buffer);
1253 dlfb->backing_buffer = new_back;
1254 }
1255 }
1256 return 0;
1257}
1258
1259/*
1260 * 1) Get EDID from hw, or use sw default
1261 * 2) Parse into various fb_info structs
1262 * 3) Allocate virtual framebuffer memory to back highest res mode
1263 *
1264 * Parses EDID into three places used by various parts of fbdev:
1265 * fb_var_screeninfo contains the timing of the monitor's preferred mode
1266 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1267 * fb_info.modelist is a linked list of all monitor & VESA modes which work
1268 *
1269 * If EDID is not readable/valid, then modelist is all VESA modes,
1270 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1271 * Returns 0 if successful
1272 */
1273static int dlfb_setup_modes(struct dlfb_data *dlfb,
1274 struct fb_info *info,
1275 char *default_edid, size_t default_edid_size)
1276{
1277 char *edid;
1278 int i, result = 0, tries = 3;
1279 struct device *dev = info->device;
1280 struct fb_videomode *mode;
1281 const struct fb_videomode *default_vmode = NULL;
1282
1283 if (info->dev) {
1284 /* only use mutex if info has been registered */
1285 mutex_lock(&info->lock);
1286 /* parent device is used otherwise */
1287 dev = info->dev;
1288 }
1289
1290 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1291 if (!edid) {
1292 result = -ENOMEM;
1293 goto error;
1294 }
1295
1296 fb_destroy_modelist(&info->modelist);
1297 memset(&info->monspecs, 0, sizeof(info->monspecs));
1298
1299 /*
1300 * Try to (re)read EDID from hardware first
1301 * EDID data may return, but not parse as valid
1302 * Try again a few times, in case of e.g. analog cable noise
1303 */
1304 while (tries--) {
1305
1306 i = dlfb_get_edid(dlfb, edid, EDID_LENGTH);
1307
1308 if (i >= EDID_LENGTH)
1309 fb_edid_to_monspecs(edid, &info->monspecs);
1310
1311 if (info->monspecs.modedb_len > 0) {
1312 dlfb->edid = edid;
1313 dlfb->edid_size = i;
1314 break;
1315 }
1316 }
1317
1318 /* If that fails, use a previously returned EDID if available */
1319 if (info->monspecs.modedb_len == 0) {
1320 dev_err(dev, "Unable to get valid EDID from device/display\n");
1321
1322 if (dlfb->edid) {
1323 fb_edid_to_monspecs(dlfb->edid, &info->monspecs);
1324 if (info->monspecs.modedb_len > 0)
1325 dev_err(dev, "Using previously queried EDID\n");
1326 }
1327 }
1328
1329 /* If that fails, use the default EDID we were handed */
1330 if (info->monspecs.modedb_len == 0) {
1331 if (default_edid_size >= EDID_LENGTH) {
1332 fb_edid_to_monspecs(default_edid, &info->monspecs);
1333 if (info->monspecs.modedb_len > 0) {
1334 memcpy(edid, default_edid, default_edid_size);
1335 dlfb->edid = edid;
1336 dlfb->edid_size = default_edid_size;
1337 dev_err(dev, "Using default/backup EDID\n");
1338 }
1339 }
1340 }
1341
1342 /* If we've got modes, let's pick a best default mode */
1343 if (info->monspecs.modedb_len > 0) {
1344
1345 for (i = 0; i < info->monspecs.modedb_len; i++) {
1346 mode = &info->monspecs.modedb[i];
1347 if (dlfb_is_valid_mode(mode, dlfb)) {
1348 fb_add_videomode(mode, &info->modelist);
1349 } else {
1350 dev_dbg(dev, "Specified mode %dx%d too big\n",
1351 mode->xres, mode->yres);
1352 if (i == 0)
1353 /* if we've removed top/best mode */
1354 info->monspecs.misc
1355 &= ~FB_MISC_1ST_DETAIL;
1356 }
1357 }
1358
1359 default_vmode = fb_find_best_display(&info->monspecs,
1360 &info->modelist);
1361 }
1362
1363 /* If everything else has failed, fall back to safe default mode */
1364 if (default_vmode == NULL) {
1365
1366 struct fb_videomode fb_vmode = {0};
1367
1368 /*
1369 * Add the standard VESA modes to our modelist
1370 * Since we don't have EDID, there may be modes that
1371 * overspec monitor and/or are incorrect aspect ratio, etc.
1372 * But at least the user has a chance to choose
1373 */
1374 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1375 mode = (struct fb_videomode *)&vesa_modes[i];
1376 if (dlfb_is_valid_mode(mode, dlfb))
1377 fb_add_videomode(mode, &info->modelist);
1378 else
1379 dev_dbg(dev, "VESA mode %dx%d too big\n",
1380 mode->xres, mode->yres);
1381 }
1382
1383 /*
1384 * default to resolution safe for projectors
1385 * (since they are most common case without EDID)
1386 */
1387 fb_vmode.xres = 800;
1388 fb_vmode.yres = 600;
1389 fb_vmode.refresh = 60;
1390 default_vmode = fb_find_nearest_mode(&fb_vmode,
1391 &info->modelist);
1392 }
1393
1394 /* If we have good mode and no active clients*/
1395 if ((default_vmode != NULL) && (dlfb->fb_count == 0)) {
1396
1397 fb_videomode_to_var(&info->var, default_vmode);
1398 dlfb_var_color_format(&info->var);
1399
1400 /*
1401 * with mode size info, we can now alloc our framebuffer.
1402 */
1403 memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix));
1404 } else
1405 result = -EINVAL;
1406
1407error:
1408 if (edid && (dlfb->edid != edid))
1409 kfree(edid);
1410
1411 if (info->dev)
1412 mutex_unlock(&info->lock);
1413
1414 return result;
1415}
1416
1417static ssize_t metrics_bytes_rendered_show(struct device *fbdev,
1418 struct device_attribute *a, char *buf) {
1419 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1420 struct dlfb_data *dlfb = fb_info->par;
1421 return sysfs_emit(buf, "%u\n",
1422 atomic_read(&dlfb->bytes_rendered));
1423}
1424
1425static ssize_t metrics_bytes_identical_show(struct device *fbdev,
1426 struct device_attribute *a, char *buf) {
1427 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1428 struct dlfb_data *dlfb = fb_info->par;
1429 return sysfs_emit(buf, "%u\n",
1430 atomic_read(&dlfb->bytes_identical));
1431}
1432
1433static ssize_t metrics_bytes_sent_show(struct device *fbdev,
1434 struct device_attribute *a, char *buf) {
1435 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1436 struct dlfb_data *dlfb = fb_info->par;
1437 return sysfs_emit(buf, "%u\n",
1438 atomic_read(&dlfb->bytes_sent));
1439}
1440
1441static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev,
1442 struct device_attribute *a, char *buf) {
1443 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1444 struct dlfb_data *dlfb = fb_info->par;
1445 return sysfs_emit(buf, "%u\n",
1446 atomic_read(&dlfb->cpu_kcycles_used));
1447}
1448
1449static ssize_t edid_show(
1450 struct file *filp,
1451 struct kobject *kobj, const struct bin_attribute *a,
1452 char *buf, loff_t off, size_t count) {
1453 struct device *fbdev = kobj_to_dev(kobj);
1454 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1455 struct dlfb_data *dlfb = fb_info->par;
1456
1457 if (dlfb->edid == NULL)
1458 return 0;
1459
1460 if ((off >= dlfb->edid_size) || (count > dlfb->edid_size))
1461 return 0;
1462
1463 if (off + count > dlfb->edid_size)
1464 count = dlfb->edid_size - off;
1465
1466 memcpy(buf, dlfb->edid, count);
1467
1468 return count;
1469}
1470
1471static ssize_t edid_store(
1472 struct file *filp,
1473 struct kobject *kobj, const struct bin_attribute *a,
1474 char *src, loff_t src_off, size_t src_size) {
1475 struct device *fbdev = kobj_to_dev(kobj);
1476 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1477 struct dlfb_data *dlfb = fb_info->par;
1478 int ret;
1479
1480 /* We only support write of entire EDID at once, no offset*/
1481 if ((src_size != EDID_LENGTH) || (src_off != 0))
1482 return -EINVAL;
1483
1484 ret = dlfb_setup_modes(dlfb, fb_info, src, src_size);
1485 if (ret)
1486 return ret;
1487
1488 if (!dlfb->edid || memcmp(src, dlfb->edid, src_size))
1489 return -EINVAL;
1490
1491 ret = dlfb_ops_set_par(fb_info);
1492 if (ret)
1493 return ret;
1494
1495 return src_size;
1496}
1497
1498static ssize_t metrics_reset_store(struct device *fbdev,
1499 struct device_attribute *attr,
1500 const char *buf, size_t count)
1501{
1502 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1503 struct dlfb_data *dlfb = fb_info->par;
1504
1505 atomic_set(&dlfb->bytes_rendered, 0);
1506 atomic_set(&dlfb->bytes_identical, 0);
1507 atomic_set(&dlfb->bytes_sent, 0);
1508 atomic_set(&dlfb->cpu_kcycles_used, 0);
1509
1510 return count;
1511}
1512
1513static const struct bin_attribute edid_attr = {
1514 .attr.name = "edid",
1515 .attr.mode = 0666,
1516 .size = EDID_LENGTH,
1517 .read = edid_show,
1518 .write = edid_store
1519};
1520
1521static const struct device_attribute fb_device_attrs[] = {
1522 __ATTR_RO(metrics_bytes_rendered),
1523 __ATTR_RO(metrics_bytes_identical),
1524 __ATTR_RO(metrics_bytes_sent),
1525 __ATTR_RO(metrics_cpu_kcycles_used),
1526 __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store),
1527};
1528
1529/*
1530 * This is necessary before we can communicate with the display controller.
1531 */
1532static int dlfb_select_std_channel(struct dlfb_data *dlfb)
1533{
1534 int ret;
1535 static const u8 set_def_chn[] = {
1536 0x57, 0xCD, 0xDC, 0xA7,
1537 0x1C, 0x88, 0x5E, 0x15,
1538 0x60, 0xFE, 0xC6, 0x97,
1539 0x16, 0x3D, 0x47, 0xF2 };
1540
1541 ret = usb_control_msg_send(dlfb->udev, 0, NR_USB_REQUEST_CHANNEL,
1542 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
1543 &set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT,
1544 GFP_KERNEL);
1545
1546 return ret;
1547}
1548
1549static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb,
1550 struct usb_interface *intf)
1551{
1552 char *desc;
1553 char *buf;
1554 char *desc_end;
1555 int total_len;
1556
1557 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
1558 if (!buf)
1559 return false;
1560 desc = buf;
1561
1562 total_len = usb_get_descriptor(interface_to_usbdev(intf),
1563 0x5f, /* vendor specific */
1564 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
1565
1566 /* if not found, look in configuration descriptor */
1567 if (total_len < 0) {
1568 if (0 == usb_get_extra_descriptor(intf->cur_altsetting,
1569 0x5f, &desc))
1570 total_len = (int) desc[0];
1571 }
1572
1573 if (total_len > 5) {
1574 dev_info(&intf->dev,
1575 "vendor descriptor length: %d data: %11ph\n",
1576 total_len, desc);
1577
1578 if ((desc[0] != total_len) || /* descriptor length */
1579 (desc[1] != 0x5f) || /* vendor descriptor type */
1580 (desc[2] != 0x01) || /* version (2 bytes) */
1581 (desc[3] != 0x00) ||
1582 (desc[4] != total_len - 2)) /* length after type */
1583 goto unrecognized;
1584
1585 desc_end = desc + total_len;
1586 desc += 5; /* the fixed header we've already parsed */
1587
1588 while (desc < desc_end) {
1589 char *value;
1590 u8 length;
1591 u16 key;
1592
1593 if (desc_end - desc < sizeof(key) + sizeof(length))
1594 goto unrecognized;
1595
1596 key = get_unaligned_le16(desc);
1597 desc += sizeof(key);
1598 length = *desc++;
1599
1600 if (length > desc_end - desc)
1601 goto unrecognized;
1602
1603 value = desc;
1604 switch (key) {
1605 case 0x0200: { /* max_area */
1606 u32 max_area;
1607
1608 if (length < sizeof(max_area))
1609 goto unrecognized;
1610
1611 max_area = get_unaligned_le32(value);
1612 dev_warn(&intf->dev,
1613 "DL chip limited to %d pixel modes\n",
1614 max_area);
1615 dlfb->sku_pixel_limit = max_area;
1616 break;
1617 }
1618 default:
1619 break;
1620 }
1621 desc += length;
1622 }
1623 } else {
1624 dev_info(&intf->dev, "vendor descriptor not available (%d)\n",
1625 total_len);
1626 }
1627
1628 goto success;
1629
1630unrecognized:
1631 /* allow udlfb to load for now even if firmware unrecognized */
1632 dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n");
1633
1634success:
1635 kfree(buf);
1636 return true;
1637}
1638
1639static int dlfb_usb_probe(struct usb_interface *intf,
1640 const struct usb_device_id *id)
1641{
1642 int i;
1643 const struct device_attribute *attr;
1644 struct dlfb_data *dlfb;
1645 struct fb_info *info;
1646 int retval;
1647 struct usb_device *usbdev = interface_to_usbdev(intf);
1648 static u8 out_ep[] = {OUT_EP_NUM + USB_DIR_OUT, 0};
1649
1650 /* usb initialization */
1651 dlfb = kzalloc_obj(*dlfb);
1652 if (!dlfb) {
1653 dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__);
1654 return -ENOMEM;
1655 }
1656
1657 INIT_LIST_HEAD(&dlfb->deferred_free);
1658
1659 dlfb->udev = usb_get_dev(usbdev);
1660 usb_set_intfdata(intf, dlfb);
1661
1662 if (!usb_check_bulk_endpoints(intf, out_ep)) {
1663 dev_err(&intf->dev, "Invalid DisplayLink device!\n");
1664 retval = -EINVAL;
1665 goto error;
1666 }
1667
1668 dev_dbg(&intf->dev, "console enable=%d\n", console);
1669 dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio);
1670 dev_dbg(&intf->dev, "shadow enable=%d\n", shadow);
1671
1672 dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */
1673
1674 if (!dlfb_parse_vendor_descriptor(dlfb, intf)) {
1675 dev_err(&intf->dev,
1676 "firmware not recognized, incompatible device?\n");
1677 retval = -ENODEV;
1678 goto error;
1679 }
1680
1681 if (pixel_limit) {
1682 dev_warn(&intf->dev,
1683 "DL chip limit of %d overridden to %d\n",
1684 dlfb->sku_pixel_limit, pixel_limit);
1685 dlfb->sku_pixel_limit = pixel_limit;
1686 }
1687
1688
1689 /* allocates framebuffer driver structure, not framebuffer memory */
1690 info = framebuffer_alloc(0, &dlfb->udev->dev);
1691 if (!info) {
1692 retval = -ENOMEM;
1693 goto error;
1694 }
1695
1696 dlfb->info = info;
1697 info->par = dlfb;
1698 info->pseudo_palette = dlfb->pseudo_palette;
1699 dlfb->ops = dlfb_ops;
1700 info->fbops = &dlfb->ops;
1701
1702 mutex_init(&dlfb->render_mutex);
1703 dlfb_init_damage(dlfb);
1704 spin_lock_init(&dlfb->damage_lock);
1705 INIT_WORK(&dlfb->damage_work, dlfb_damage_work);
1706
1707 INIT_LIST_HEAD(&info->modelist);
1708
1709 if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1710 retval = -ENOMEM;
1711 dev_err(&intf->dev, "unable to allocate urb list\n");
1712 goto error;
1713 }
1714
1715 /* We don't register a new USB class. Our client interface is dlfbev */
1716
1717 retval = fb_alloc_cmap(&info->cmap, 256, 0);
1718 if (retval < 0) {
1719 dev_err(info->device, "cmap allocation failed: %d\n", retval);
1720 goto error;
1721 }
1722
1723 retval = dlfb_setup_modes(dlfb, info, NULL, 0);
1724 if (retval != 0) {
1725 dev_err(info->device,
1726 "unable to find common mode for display and adapter\n");
1727 goto error;
1728 }
1729
1730 /* ready to begin using device */
1731
1732 atomic_set(&dlfb->usb_active, 1);
1733 dlfb_select_std_channel(dlfb);
1734
1735 dlfb_ops_check_var(&info->var, info);
1736 retval = dlfb_ops_set_par(info);
1737 if (retval)
1738 goto error;
1739
1740 retval = register_framebuffer(info);
1741 if (retval < 0) {
1742 dev_err(info->device, "unable to register framebuffer: %d\n",
1743 retval);
1744 goto error;
1745 }
1746
1747 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) {
1748 attr = &fb_device_attrs[i];
1749 retval = device_create_file(info->dev, attr);
1750 if (retval)
1751 dev_warn(info->device,
1752 "failed to create '%s' attribute: %d\n",
1753 attr->attr.name, retval);
1754 }
1755
1756 retval = device_create_bin_file(info->dev, &edid_attr);
1757 if (retval)
1758 dev_warn(info->device, "failed to create '%s' attribute: %d\n",
1759 edid_attr.attr.name, retval);
1760
1761 dev_info(info->device,
1762 "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n",
1763 dev_name(info->dev), info->var.xres, info->var.yres,
1764 ((dlfb->backing_buffer) ?
1765 info->fix.smem_len * 2 : info->fix.smem_len) >> 10);
1766 return 0;
1767
1768error:
1769 if (dlfb->info) {
1770 dlfb_ops_destroy(dlfb->info);
1771 } else {
1772 usb_put_dev(dlfb->udev);
1773 kfree(dlfb);
1774 }
1775 return retval;
1776}
1777
1778static void dlfb_usb_disconnect(struct usb_interface *intf)
1779{
1780 struct dlfb_data *dlfb;
1781 struct fb_info *info;
1782 int i;
1783
1784 dlfb = usb_get_intfdata(intf);
1785 info = dlfb->info;
1786
1787 dev_dbg(&intf->dev, "USB disconnect starting\n");
1788
1789 /* we virtualize until all fb clients release. Then we free */
1790 dlfb->virtualized = true;
1791
1792 /* When non-active we'll update virtual framebuffer, but no new urbs */
1793 atomic_set(&dlfb->usb_active, 0);
1794
1795 /* this function will wait for all in-flight urbs to complete */
1796 dlfb_free_urb_list(dlfb);
1797
1798 /* remove udlfb's sysfs interfaces */
1799 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
1800 device_remove_file(info->dev, &fb_device_attrs[i]);
1801 device_remove_bin_file(info->dev, &edid_attr);
1802
1803 unregister_framebuffer(info);
1804}
1805
1806static struct usb_driver dlfb_driver = {
1807 .name = "udlfb",
1808 .probe = dlfb_usb_probe,
1809 .disconnect = dlfb_usb_disconnect,
1810 .id_table = id_table,
1811};
1812
1813module_usb_driver(dlfb_driver);
1814
1815static void dlfb_urb_completion(struct urb *urb)
1816{
1817 struct urb_node *unode = urb->context;
1818 struct dlfb_data *dlfb = unode->dlfb;
1819 unsigned long flags;
1820
1821 switch (urb->status) {
1822 case 0:
1823 /* success */
1824 break;
1825 case -ECONNRESET:
1826 case -ENOENT:
1827 case -ESHUTDOWN:
1828 /* sync/async unlink faults aren't errors */
1829 break;
1830 default:
1831 dev_err(&dlfb->udev->dev,
1832 "%s - nonzero write bulk status received: %d\n",
1833 __func__, urb->status);
1834 atomic_set(&dlfb->lost_pixels, 1);
1835 break;
1836 }
1837
1838 urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */
1839
1840 spin_lock_irqsave(&dlfb->urbs.lock, flags);
1841 list_add_tail(&unode->entry, &dlfb->urbs.list);
1842 dlfb->urbs.available++;
1843 spin_unlock_irqrestore(&dlfb->urbs.lock, flags);
1844
1845 up(&dlfb->urbs.limit_sem);
1846}
1847
1848static void dlfb_free_urb_list(struct dlfb_data *dlfb)
1849{
1850 int count = dlfb->urbs.count;
1851 struct list_head *node;
1852 struct urb_node *unode;
1853 struct urb *urb;
1854
1855 /* keep waiting and freeing, until we've got 'em all */
1856 while (count--) {
1857 down(&dlfb->urbs.limit_sem);
1858
1859 spin_lock_irq(&dlfb->urbs.lock);
1860
1861 node = dlfb->urbs.list.next; /* have reserved one with sem */
1862 list_del_init(node);
1863
1864 spin_unlock_irq(&dlfb->urbs.lock);
1865
1866 unode = list_entry(node, struct urb_node, entry);
1867 urb = unode->urb;
1868
1869 /* Free each separately allocated piece */
1870 usb_free_coherent(urb->dev, dlfb->urbs.size,
1871 urb->transfer_buffer, urb->transfer_dma);
1872 usb_free_urb(urb);
1873 kfree(node);
1874 }
1875
1876 dlfb->urbs.count = 0;
1877}
1878
1879static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size)
1880{
1881 struct urb *urb;
1882 struct urb_node *unode;
1883 char *buf;
1884 size_t wanted_size = count * size;
1885
1886 spin_lock_init(&dlfb->urbs.lock);
1887
1888retry:
1889 dlfb->urbs.size = size;
1890 INIT_LIST_HEAD(&dlfb->urbs.list);
1891
1892 sema_init(&dlfb->urbs.limit_sem, 0);
1893 dlfb->urbs.count = 0;
1894 dlfb->urbs.available = 0;
1895
1896 while (dlfb->urbs.count * size < wanted_size) {
1897 unode = kzalloc_obj(*unode);
1898 if (!unode)
1899 break;
1900 unode->dlfb = dlfb;
1901
1902 urb = usb_alloc_urb(0, GFP_KERNEL);
1903 if (!urb) {
1904 kfree(unode);
1905 break;
1906 }
1907 unode->urb = urb;
1908
1909 buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL,
1910 &urb->transfer_dma);
1911 if (!buf) {
1912 kfree(unode);
1913 usb_free_urb(urb);
1914 if (size > PAGE_SIZE) {
1915 size /= 2;
1916 dlfb_free_urb_list(dlfb);
1917 goto retry;
1918 }
1919 break;
1920 }
1921
1922 /* urb->transfer_buffer_length set to actual before submit */
1923 usb_fill_bulk_urb(urb, dlfb->udev,
1924 usb_sndbulkpipe(dlfb->udev, OUT_EP_NUM),
1925 buf, size, dlfb_urb_completion, unode);
1926 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1927
1928 list_add_tail(&unode->entry, &dlfb->urbs.list);
1929
1930 up(&dlfb->urbs.limit_sem);
1931 dlfb->urbs.count++;
1932 dlfb->urbs.available++;
1933 }
1934
1935 return dlfb->urbs.count;
1936}
1937
1938static struct urb *dlfb_get_urb(struct dlfb_data *dlfb)
1939{
1940 int ret;
1941 struct list_head *entry;
1942 struct urb_node *unode;
1943
1944 /* Wait for an in-flight buffer to complete and get re-queued */
1945 ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT);
1946 if (ret) {
1947 atomic_set(&dlfb->lost_pixels, 1);
1948 dev_warn(&dlfb->udev->dev,
1949 "wait for urb interrupted: %d available: %d\n",
1950 ret, dlfb->urbs.available);
1951 return NULL;
1952 }
1953
1954 spin_lock_irq(&dlfb->urbs.lock);
1955
1956 BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */
1957 entry = dlfb->urbs.list.next;
1958 list_del_init(entry);
1959 dlfb->urbs.available--;
1960
1961 spin_unlock_irq(&dlfb->urbs.lock);
1962
1963 unode = list_entry(entry, struct urb_node, entry);
1964 return unode->urb;
1965}
1966
1967static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len)
1968{
1969 int ret;
1970
1971 BUG_ON(len > dlfb->urbs.size);
1972
1973 urb->transfer_buffer_length = len; /* set to actual payload len */
1974 ret = usb_submit_urb(urb, GFP_KERNEL);
1975 if (ret) {
1976 dlfb_urb_completion(urb); /* because no one else will */
1977 atomic_set(&dlfb->lost_pixels, 1);
1978 dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret);
1979 }
1980 return ret;
1981}
1982
1983module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1984MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer");
1985
1986module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1987MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes");
1988
1989module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1990MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf");
1991
1992module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1993MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)");
1994
1995MODULE_AUTHOR("Roberto De Ioris <[email protected]>, "
1996 "Jaya Kumar <[email protected]>, "
1997 "Bernie Thompson <[email protected]>");
1998MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver");
1999MODULE_LICENSE("GPL");
2000