2
* udlfb.c -- Framebuffer driver for DisplayLink USB controller
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>
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
12
* Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
13
* usb-skeleton by GregKH.
15
* Device-specific portions based on information from Displaylink, with work
16
* from Florian Echtler, Henrik Bjerregaard Pedersen, and others.
19
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
#include <linux/module.h>
22
#include <linux/kernel.h>
23
#include <linux/init.h>
24
#include <linux/usb.h>
25
#include <linux/uaccess.h>
28
#include <linux/vmalloc.h>
29
#include <linux/slab.h>
30
#include <linux/prefetch.h>
31
#include <linux/delay.h>
32
#include <video/udlfb.h>
35
static struct fb_fix_screeninfo dlfb_fix = {
37
.type = FB_TYPE_PACKED_PIXELS,
38
.visual = FB_VISUAL_TRUECOLOR,
42
.accel = FB_ACCEL_NONE,
45
static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
47
FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
48
FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
51
* There are many DisplayLink-based graphics products, all with unique PIDs.
52
* So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
53
* We also require a match on SubClass (0x00) and Protocol (0x00),
54
* which is compatible with all known USB 2.0 era graphics chips and firmware,
55
* but allows DisplayLink to increment those for any future incompatible chips
57
static struct usb_device_id id_table[] = {
59
.bInterfaceClass = 0xff,
60
.bInterfaceSubClass = 0x00,
61
.bInterfaceProtocol = 0x00,
62
.match_flags = USB_DEVICE_ID_MATCH_VENDOR |
63
USB_DEVICE_ID_MATCH_INT_CLASS |
64
USB_DEVICE_ID_MATCH_INT_SUBCLASS |
65
USB_DEVICE_ID_MATCH_INT_PROTOCOL,
69
MODULE_DEVICE_TABLE(usb, id_table);
72
static int console = 1; /* Allow fbcon to open framebuffer */
73
static int fb_defio = 1; /* Detect mmap writes using page faults */
74
static int shadow = 1; /* Optionally disable shadow framebuffer */
76
/* dlfb keeps a list of urbs for efficient bulk transfers */
77
static void dlfb_urb_completion(struct urb *urb);
78
static struct urb *dlfb_get_urb(struct dlfb_data *dev);
79
static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len);
80
static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size);
81
static void dlfb_free_urb_list(struct dlfb_data *dev);
84
* All DisplayLink bulk operations start with 0xAF, followed by specific code
85
* All operations are written to buffers which then later get sent to device
87
static char *dlfb_set_register(char *buf, u8 reg, u8 val)
96
static char *dlfb_vidreg_lock(char *buf)
98
return dlfb_set_register(buf, 0xFF, 0x00);
101
static char *dlfb_vidreg_unlock(char *buf)
103
return dlfb_set_register(buf, 0xFF, 0xFF);
107
* Map FB_BLANK_* to DisplayLink register
109
* ----- -----------------------------
110
* 0x00 FB_BLANK_UNBLANK (0)
112
* 0x03 FB_BLANK_VSYNC_SUSPEND (2)
113
* 0x05 FB_BLANK_HSYNC_SUSPEND (3)
114
* 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back
116
static char *dlfb_blanking(char *buf, int fb_blank)
121
case FB_BLANK_POWERDOWN:
124
case FB_BLANK_HSYNC_SUSPEND:
127
case FB_BLANK_VSYNC_SUSPEND:
130
case FB_BLANK_NORMAL:
137
buf = dlfb_set_register(buf, 0x1F, reg);
142
static char *dlfb_set_color_depth(char *buf, u8 selection)
144
return dlfb_set_register(buf, 0x00, selection);
147
static char *dlfb_set_base16bpp(char *wrptr, u32 base)
149
/* the base pointer is 16 bits wide, 0x20 is hi byte. */
150
wrptr = dlfb_set_register(wrptr, 0x20, base >> 16);
151
wrptr = dlfb_set_register(wrptr, 0x21, base >> 8);
152
return dlfb_set_register(wrptr, 0x22, base);
156
* DisplayLink HW has separate 16bpp and 8bpp framebuffers.
157
* In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
159
static char *dlfb_set_base8bpp(char *wrptr, u32 base)
161
wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);
162
wrptr = dlfb_set_register(wrptr, 0x27, base >> 8);
163
return dlfb_set_register(wrptr, 0x28, base);
166
static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value)
168
wrptr = dlfb_set_register(wrptr, reg, value >> 8);
169
return dlfb_set_register(wrptr, reg+1, value);
173
* This is kind of weird because the controller takes some
174
* register values in a different byte order than other registers.
176
static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)
178
wrptr = dlfb_set_register(wrptr, reg, value);
179
return dlfb_set_register(wrptr, reg+1, value >> 8);
183
* LFSR is linear feedback shift register. The reason we have this is
184
* because the display controller needs to minimize the clock depth of
185
* various counters used in the display path. So this code reverses the
186
* provided value into the lfsr16 value by counting backwards to get
187
* the value that needs to be set in the hardware comparator to get the
188
* same actual count. This makes sense once you read above a couple of
189
* times and think about it from a hardware perspective.
191
static u16 dlfb_lfsr16(u16 actual_count)
193
u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
195
while (actual_count--) {
197
(((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
205
* This does LFSR conversion on the value that is to be written.
206
* See LFSR explanation above for more detail.
208
static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
210
return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));
214
* This takes a standard fbdev screeninfo struct and all of its monitor mode
215
* details and converts them into the DisplayLink equivalent register commands.
217
static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var)
223
/* x display start */
224
xds = var->left_margin + var->hsync_len;
225
wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);
227
xde = xds + var->xres;
228
wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);
230
/* y display start */
231
yds = var->upper_margin + var->vsync_len;
232
wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);
234
yde = yds + var->yres;
235
wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);
237
/* x end count is active + blanking - 1 */
238
wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,
239
xde + var->right_margin - 1);
241
/* libdlo hardcodes hsync start to 1 */
242
wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);
244
/* hsync end is width of sync pulse + 1 */
245
wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
247
/* hpixels is active pixels */
248
wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);
250
/* yendcount is vertical active + vertical blanking */
251
yec = var->yres + var->upper_margin + var->lower_margin +
253
wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
255
/* libdlo hardcodes vsync start to 0 */
256
wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
258
/* vsync end is width of vsync pulse */
259
wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);
261
/* vpixels is active pixels */
262
wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);
264
/* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */
265
wrptr = dlfb_set_register_16be(wrptr, 0x1B,
266
200*1000*1000/var->pixclock);
272
* This takes a standard fbdev screeninfo struct that was fetched or prepared
273
* and then generates the appropriate command sequence that then drives the
274
* display controller.
276
static int dlfb_set_video_mode(struct dlfb_data *dev,
277
struct fb_var_screeninfo *var)
285
if (!atomic_read(&dev->usb_active))
288
urb = dlfb_get_urb(dev);
292
buf = (char *) urb->transfer_buffer;
295
* This first section has to do with setting the base address on the
296
* controller * associated with the display. There are 2 base
297
* pointers, currently, we only * use the 16 bpp segment.
299
wrptr = dlfb_vidreg_lock(buf);
300
wrptr = dlfb_set_color_depth(wrptr, 0x00);
301
/* set base for 16bpp segment to 0 */
302
wrptr = dlfb_set_base16bpp(wrptr, 0);
303
/* set base for 8bpp segment to end of fb */
304
wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
306
wrptr = dlfb_set_vid_cmds(wrptr, var);
307
wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK);
308
wrptr = dlfb_vidreg_unlock(wrptr);
310
writesize = wrptr - buf;
312
retval = dlfb_submit_urb(dev, urb, writesize);
314
dev->blank_mode = FB_BLANK_UNBLANK;
319
static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
321
unsigned long start = vma->vm_start;
322
unsigned long size = vma->vm_end - vma->vm_start;
323
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
324
unsigned long page, pos;
326
if (offset + size > info->fix.smem_len)
329
pos = (unsigned long)info->fix.smem_start + offset;
331
pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
335
page = vmalloc_to_pfn((void *)pos);
336
if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
341
if (size > PAGE_SIZE)
347
vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
352
* Trims identical data from front and back of line
353
* Sets new front buffer address and width
354
* And returns byte count of identical pixels
355
* Assumes CPU natural alignment (unsigned long)
356
* for back and front buffer ptrs and width
358
static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)
361
const unsigned long *back = (const unsigned long *) bback;
362
const unsigned long *front = (const unsigned long *) *bfront;
363
const int width = *width_bytes / sizeof(unsigned long);
364
int identical = width;
368
prefetch((void *) front);
369
prefetch((void *) back);
371
for (j = 0; j < width; j++) {
372
if (back[j] != front[j]) {
378
for (k = width - 1; k > j; k--) {
379
if (back[k] != front[k]) {
385
identical = start + (width - end);
386
*bfront = (u8 *) &front[start];
387
*width_bytes = (end - start) * sizeof(unsigned long);
389
return identical * sizeof(unsigned long);
393
* Render a command stream for an encoded horizontal line segment of pixels.
395
* A command buffer holds several commands.
396
* It always begins with a fresh command header
397
* (the protocol doesn't require this, but we enforce it to allow
398
* multiple buffers to be potentially encoded and sent in parallel).
399
* A single command encodes one contiguous horizontal line of pixels
401
* The function relies on the client to do all allocation, so that
402
* rendering can be done directly to output buffers (e.g. USB URBs).
403
* The function fills the supplied command buffer, providing information
404
* on where it left off, so the client may call in again with additional
405
* buffers if the line will take several buffers to complete.
407
* A single command can transmit a maximum of 256 pixels,
408
* regardless of the compression ratio (protocol design limit).
409
* To the hardware, 0 for a size byte means 256
411
* Rather than 256 pixel commands which are either rl or raw encoded,
412
* the rlx command simply assumes alternating raw and rl spans within one cmd.
413
* This has a slightly larger header overhead, but produces more even results.
414
* It also processes all data (read and write) in a single pass.
415
* Performance benchmarks of common cases show it having just slightly better
416
* compression than 256 pixel raw or rle commands, with similar CPU consumpion.
417
* But for very rl friendly data, will compress not quite as well.
419
static void dlfb_compress_hline(
420
const uint16_t **pixel_start_ptr,
421
const uint16_t *const pixel_end,
422
uint32_t *device_address_ptr,
423
uint8_t **command_buffer_ptr,
424
const uint8_t *const cmd_buffer_end)
426
const uint16_t *pixel = *pixel_start_ptr;
427
uint32_t dev_addr = *device_address_ptr;
428
uint8_t *cmd = *command_buffer_ptr;
431
while ((pixel_end > pixel) &&
432
(cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
433
uint8_t *raw_pixels_count_byte = 0;
434
uint8_t *cmd_pixels_count_byte = 0;
435
const uint16_t *raw_pixel_start = 0;
436
const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0;
438
prefetchw((void *) cmd); /* pull in one cache line at least */
442
*cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF);
443
*cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF);
444
*cmd++ = (uint8_t) ((dev_addr) & 0xFF);
446
cmd_pixels_count_byte = cmd++; /* we'll know this later */
447
cmd_pixel_start = pixel;
449
raw_pixels_count_byte = cmd++; /* we'll know this later */
450
raw_pixel_start = pixel;
452
cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1,
453
min((int)(pixel_end - pixel),
454
(int)(cmd_buffer_end - cmd) / bpp));
456
prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp);
458
while (pixel < cmd_pixel_end) {
459
const uint16_t * const repeating_pixel = pixel;
461
*(uint16_t *)cmd = cpu_to_be16p(pixel);
465
if (unlikely((pixel < cmd_pixel_end) &&
466
(*pixel == *repeating_pixel))) {
467
/* go back and fill in raw pixel count */
468
*raw_pixels_count_byte = ((repeating_pixel -
469
raw_pixel_start) + 1) & 0xFF;
471
while ((pixel < cmd_pixel_end)
472
&& (*pixel == *repeating_pixel)) {
476
/* immediately after raw data is repeat byte */
477
*cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF;
479
/* Then start another raw pixel span */
480
raw_pixel_start = pixel;
481
raw_pixels_count_byte = cmd++;
485
if (pixel > raw_pixel_start) {
486
/* finalize last RAW span */
487
*raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF;
490
*cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF;
491
dev_addr += (pixel - cmd_pixel_start) * bpp;
494
if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) {
495
/* Fill leftover bytes with no-ops */
496
if (cmd_buffer_end > cmd)
497
memset(cmd, 0xAF, cmd_buffer_end - cmd);
498
cmd = (uint8_t *) cmd_buffer_end;
501
*command_buffer_ptr = cmd;
502
*pixel_start_ptr = pixel;
503
*device_address_ptr = dev_addr;
509
* There are 3 copies of every pixel: The front buffer that the fbdev
510
* client renders to, the actual framebuffer across the USB bus in hardware
511
* (that we can only write to, slowly, and can never read), and (optionally)
512
* our shadow copy that tracks what's been sent to that hardware buffer.
514
static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr,
515
const char *front, char **urb_buf_ptr,
516
u32 byte_offset, u32 byte_width,
517
int *ident_ptr, int *sent_ptr)
519
const u8 *line_start, *line_end, *next_pixel;
520
u32 dev_addr = dev->base16 + byte_offset;
521
struct urb *urb = *urb_ptr;
522
u8 *cmd = *urb_buf_ptr;
523
u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length;
525
line_start = (u8 *) (front + byte_offset);
526
next_pixel = line_start;
527
line_end = next_pixel + byte_width;
529
if (dev->backing_buffer) {
531
const u8 *back_start = (u8 *) (dev->backing_buffer
534
*ident_ptr += dlfb_trim_hline(back_start, &next_pixel,
537
offset = next_pixel - line_start;
538
line_end = next_pixel + byte_width;
540
back_start += offset;
541
line_start += offset;
543
memcpy((char *)back_start, (char *) line_start,
547
while (next_pixel < line_end) {
549
dlfb_compress_hline((const uint16_t **) &next_pixel,
550
(const uint16_t *) line_end, &dev_addr,
551
(u8 **) &cmd, (u8 *) cmd_end);
553
if (cmd >= cmd_end) {
554
int len = cmd - (u8 *) urb->transfer_buffer;
555
if (dlfb_submit_urb(dev, urb, len))
556
return 1; /* lost pixels is set */
558
urb = dlfb_get_urb(dev);
560
return 1; /* lost_pixels is set */
562
cmd = urb->transfer_buffer;
563
cmd_end = &cmd[urb->transfer_buffer_length];
572
int dlfb_handle_damage(struct dlfb_data *dev, int x, int y,
573
int width, int height, char *data)
577
cycles_t start_cycles, end_cycles;
579
int bytes_identical = 0;
583
start_cycles = get_cycles();
585
aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
586
width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
590
(x + width > dev->info->var.xres) ||
591
(y + height > dev->info->var.yres))
594
if (!atomic_read(&dev->usb_active))
597
urb = dlfb_get_urb(dev);
600
cmd = urb->transfer_buffer;
602
for (i = y; i < y + height ; i++) {
603
const int line_offset = dev->info->fix.line_length * i;
604
const int byte_offset = line_offset + (x * BPP);
606
if (dlfb_render_hline(dev, &urb,
607
(char *) dev->info->fix.smem_start,
608
&cmd, byte_offset, width * BPP,
609
&bytes_identical, &bytes_sent))
613
if (cmd > (char *) urb->transfer_buffer) {
614
/* Send partial buffer remaining before exiting */
615
int len = cmd - (char *) urb->transfer_buffer;
616
ret = dlfb_submit_urb(dev, urb, len);
619
dlfb_urb_completion(urb);
622
atomic_add(bytes_sent, &dev->bytes_sent);
623
atomic_add(bytes_identical, &dev->bytes_identical);
624
atomic_add(width*height*2, &dev->bytes_rendered);
625
end_cycles = get_cycles();
626
atomic_add(((unsigned int) ((end_cycles - start_cycles)
627
>> 10)), /* Kcycles */
628
&dev->cpu_kcycles_used);
634
* Path triggered by usermode clients who write to filesystem
635
* e.g. cat filename > /dev/fb1
636
* Not used by X Windows or text-mode console. But useful for testing.
637
* Slow because of extra copy and we must assume all pixels dirty.
639
static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf,
640
size_t count, loff_t *ppos)
643
struct dlfb_data *dev = info->par;
644
u32 offset = (u32) *ppos;
646
result = fb_sys_write(info, buf, count, ppos);
649
int start = max((int)(offset / info->fix.line_length) - 1, 0);
650
int lines = min((u32)((result / info->fix.line_length) + 1),
651
(u32)info->var.yres);
653
dlfb_handle_damage(dev, 0, start, info->var.xres,
654
lines, info->screen_base);
660
/* hardware has native COPY command (see libdlo), but not worth it for fbcon */
661
static void dlfb_ops_copyarea(struct fb_info *info,
662
const struct fb_copyarea *area)
665
struct dlfb_data *dev = info->par;
667
sys_copyarea(info, area);
669
dlfb_handle_damage(dev, area->dx, area->dy,
670
area->width, area->height, info->screen_base);
673
static void dlfb_ops_imageblit(struct fb_info *info,
674
const struct fb_image *image)
676
struct dlfb_data *dev = info->par;
678
sys_imageblit(info, image);
680
dlfb_handle_damage(dev, image->dx, image->dy,
681
image->width, image->height, info->screen_base);
684
static void dlfb_ops_fillrect(struct fb_info *info,
685
const struct fb_fillrect *rect)
687
struct dlfb_data *dev = info->par;
689
sys_fillrect(info, rect);
691
dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width,
692
rect->height, info->screen_base);
696
* NOTE: fb_defio.c is holding info->fbdefio.mutex
697
* Touching ANY framebuffer memory that triggers a page fault
698
* in fb_defio will cause a deadlock, when it also tries to
699
* grab the same mutex.
701
static void dlfb_dpy_deferred_io(struct fb_info *info,
702
struct list_head *pagelist)
705
struct fb_deferred_io *fbdefio = info->fbdefio;
706
struct dlfb_data *dev = info->par;
709
cycles_t start_cycles, end_cycles;
711
int bytes_identical = 0;
712
int bytes_rendered = 0;
717
if (!atomic_read(&dev->usb_active))
720
start_cycles = get_cycles();
722
urb = dlfb_get_urb(dev);
726
cmd = urb->transfer_buffer;
728
/* walk the written page list and render each to device */
729
list_for_each_entry(cur, &fbdefio->pagelist, lru) {
731
if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start,
732
&cmd, cur->index << PAGE_SHIFT,
733
PAGE_SIZE, &bytes_identical, &bytes_sent))
735
bytes_rendered += PAGE_SIZE;
738
if (cmd > (char *) urb->transfer_buffer) {
739
/* Send partial buffer remaining before exiting */
740
int len = cmd - (char *) urb->transfer_buffer;
741
dlfb_submit_urb(dev, urb, len);
744
dlfb_urb_completion(urb);
747
atomic_add(bytes_sent, &dev->bytes_sent);
748
atomic_add(bytes_identical, &dev->bytes_identical);
749
atomic_add(bytes_rendered, &dev->bytes_rendered);
750
end_cycles = get_cycles();
751
atomic_add(((unsigned int) ((end_cycles - start_cycles)
752
>> 10)), /* Kcycles */
753
&dev->cpu_kcycles_used);
756
static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len)
762
rbuf = kmalloc(2, GFP_KERNEL);
766
for (i = 0; i < len; i++) {
767
ret = usb_control_msg(dev->udev,
768
usb_rcvctrlpipe(dev->udev, 0), (0x02),
769
(0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
772
pr_err("Read EDID byte %d failed err %x\n", i, ret);
784
static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
788
struct dlfb_data *dev = info->par;
790
if (!atomic_read(&dev->usb_active))
793
/* TODO: Update X server to get this from sysfs instead */
794
if (cmd == DLFB_IOCTL_RETURN_EDID) {
795
void __user *edid = (void __user *)arg;
796
if (copy_to_user(edid, dev->edid, dev->edid_size))
801
/* TODO: Help propose a standard fb.h ioctl to report mmap damage */
802
if (cmd == DLFB_IOCTL_REPORT_DAMAGE) {
805
if (copy_from_user(&area, (void __user *)arg,
806
sizeof(struct dloarea)))
810
* If we have a damage-aware client, turn fb_defio "off"
811
* To avoid perf imact of unnecessary page fault handling.
812
* Done by resetting the delay for this fb_info to a very
813
* long period. Pages will become writable and stay that way.
814
* Reset to normal value when all clients have closed this fb.
817
info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE;
822
if (area.x > info->var.xres)
823
area.x = info->var.xres;
828
if (area.y > info->var.yres)
829
area.y = info->var.yres;
831
dlfb_handle_damage(dev, area.x, area.y, area.w, area.h,
838
/* taken from vesafb */
840
dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
841
unsigned blue, unsigned transp, struct fb_info *info)
845
if (regno >= info->cmap.len)
849
if (info->var.red.offset == 10) {
851
((u32 *) (info->pseudo_palette))[regno] =
852
((red & 0xf800) >> 1) |
853
((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
856
((u32 *) (info->pseudo_palette))[regno] =
858
((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
866
* It's common for several clients to have framebuffer open simultaneously.
867
* e.g. both fbcon and X. Makes things interesting.
868
* Assumes caller is holding info->lock (for open and release at least)
870
static int dlfb_ops_open(struct fb_info *info, int user)
872
struct dlfb_data *dev = info->par;
875
* fbcon aggressively connects to first framebuffer it finds,
876
* preventing other clients (X) from working properly. Usually
877
* not what the user wants. Fail by default with option to enable.
879
if ((user == 0) && (!console))
882
/* If the USB device is gone, we don't accept new opens */
883
if (dev->virtualized)
888
kref_get(&dev->kref);
890
if (fb_defio && (info->fbdefio == NULL)) {
891
/* enable defio at last moment if not disabled by client */
893
struct fb_deferred_io *fbdefio;
895
fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
898
fbdefio->delay = DL_DEFIO_WRITE_DELAY;
899
fbdefio->deferred_io = dlfb_dpy_deferred_io;
902
info->fbdefio = fbdefio;
903
fb_deferred_io_init(info);
906
pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
907
info->node, user, info, dev->fb_count);
913
* Called when all client interfaces to start transactions have been disabled,
914
* and all references to our device instance (dlfb_data) are released.
915
* Every transaction must have a reference, so we know are fully spun down
917
static void dlfb_free(struct kref *kref)
919
struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref);
921
/* this function will wait for all in-flight urbs to complete */
922
if (dev->urbs.count > 0)
923
dlfb_free_urb_list(dev);
925
if (dev->backing_buffer)
926
vfree(dev->backing_buffer);
930
pr_warn("freeing dlfb_data %p\n", dev);
935
static void dlfb_release_urb_work(struct work_struct *work)
937
struct urb_node *unode = container_of(work, struct urb_node,
938
release_urb_work.work);
940
up(&unode->dev->urbs.limit_sem);
943
static void dlfb_free_framebuffer_work(struct work_struct *work)
945
struct dlfb_data *dev = container_of(work, struct dlfb_data,
946
free_framebuffer_work.work);
947
struct fb_info *info = dev->info;
948
int node = info->node;
950
unregister_framebuffer(info);
952
if (info->cmap.len != 0)
953
fb_dealloc_cmap(&info->cmap);
954
if (info->monspecs.modedb)
955
fb_destroy_modedb(info->monspecs.modedb);
956
if (info->screen_base)
957
vfree(info->screen_base);
959
fb_destroy_modelist(&info->modelist);
963
/* Assume info structure is freed after this point */
964
framebuffer_release(info);
966
pr_warn("fb_info for /dev/fb%d has been freed\n", node);
968
/* ref taken in probe() as part of registering framebfufer */
969
kref_put(&dev->kref, dlfb_free);
973
* Assumes caller is holding info->lock mutex (for open and release at least)
975
static int dlfb_ops_release(struct fb_info *info, int user)
977
struct dlfb_data *dev = info->par;
981
/* We can't free fb_info here - fbmem will touch it when we return */
982
if (dev->virtualized && (dev->fb_count == 0))
983
schedule_delayed_work(&dev->free_framebuffer_work, HZ);
985
if ((dev->fb_count == 0) && (info->fbdefio)) {
986
fb_deferred_io_cleanup(info);
987
kfree(info->fbdefio);
988
info->fbdefio = NULL;
989
info->fbops->fb_mmap = dlfb_ops_mmap;
992
pr_warn("released /dev/fb%d user=%d count=%d\n",
993
info->node, user, dev->fb_count);
995
kref_put(&dev->kref, dlfb_free);
1001
* Check whether a video mode is supported by the DisplayLink chip
1002
* We start from monitor's modes, so don't need to filter that here
1004
static int dlfb_is_valid_mode(struct fb_videomode *mode,
1005
struct fb_info *info)
1007
struct dlfb_data *dev = info->par;
1009
if (mode->xres * mode->yres > dev->sku_pixel_limit) {
1010
pr_warn("%dx%d beyond chip capabilities\n",
1011
mode->xres, mode->yres);
1015
pr_info("%dx%d valid mode\n", mode->xres, mode->yres);
1020
static void dlfb_var_color_format(struct fb_var_screeninfo *var)
1022
const struct fb_bitfield red = { 11, 5, 0 };
1023
const struct fb_bitfield green = { 5, 6, 0 };
1024
const struct fb_bitfield blue = { 0, 5, 0 };
1026
var->bits_per_pixel = 16;
1032
static int dlfb_ops_check_var(struct fb_var_screeninfo *var,
1033
struct fb_info *info)
1035
struct fb_videomode mode;
1037
/* TODO: support dynamically changing framebuffer size */
1038
if ((var->xres * var->yres * 2) > info->fix.smem_len)
1041
/* set device-specific elements of var unrelated to mode */
1042
dlfb_var_color_format(var);
1044
fb_var_to_videomode(&mode, var);
1046
if (!dlfb_is_valid_mode(&mode, info))
1052
static int dlfb_ops_set_par(struct fb_info *info)
1054
struct dlfb_data *dev = info->par;
1056
u16 *pix_framebuffer;
1059
pr_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres);
1061
result = dlfb_set_video_mode(dev, &info->var);
1063
if ((result == 0) && (dev->fb_count == 0)) {
1065
/* paint greenscreen */
1067
pix_framebuffer = (u16 *) info->screen_base;
1068
for (i = 0; i < info->fix.smem_len / 2; i++)
1069
pix_framebuffer[i] = 0x37e6;
1071
dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres,
1078
/* To fonzi the jukebox (e.g. make blanking changes take effect) */
1079
static char *dlfb_dummy_render(char *buf)
1082
*buf++ = 0x6A; /* copy */
1083
*buf++ = 0x00; /* from address*/
1086
*buf++ = 0x01; /* one pixel */
1087
*buf++ = 0x00; /* to address */
1094
* In order to come back from full DPMS off, we need to set the mode again
1096
static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
1098
struct dlfb_data *dev = info->par;
1102
pr_info("/dev/fb%d FB_BLANK mode %d --> %d\n",
1103
info->node, dev->blank_mode, blank_mode);
1105
if ((dev->blank_mode == FB_BLANK_POWERDOWN) &&
1106
(blank_mode != FB_BLANK_POWERDOWN)) {
1108
/* returning from powerdown requires a fresh modeset */
1109
dlfb_set_video_mode(dev, &info->var);
1112
urb = dlfb_get_urb(dev);
1116
bufptr = (char *) urb->transfer_buffer;
1117
bufptr = dlfb_vidreg_lock(bufptr);
1118
bufptr = dlfb_blanking(bufptr, blank_mode);
1119
bufptr = dlfb_vidreg_unlock(bufptr);
1121
/* seems like a render op is needed to have blank change take effect */
1122
bufptr = dlfb_dummy_render(bufptr);
1124
dlfb_submit_urb(dev, urb, bufptr -
1125
(char *) urb->transfer_buffer);
1127
dev->blank_mode = blank_mode;
1132
static struct fb_ops dlfb_ops = {
1133
.owner = THIS_MODULE,
1134
.fb_read = fb_sys_read,
1135
.fb_write = dlfb_ops_write,
1136
.fb_setcolreg = dlfb_ops_setcolreg,
1137
.fb_fillrect = dlfb_ops_fillrect,
1138
.fb_copyarea = dlfb_ops_copyarea,
1139
.fb_imageblit = dlfb_ops_imageblit,
1140
.fb_mmap = dlfb_ops_mmap,
1141
.fb_ioctl = dlfb_ops_ioctl,
1142
.fb_open = dlfb_ops_open,
1143
.fb_release = dlfb_ops_release,
1144
.fb_blank = dlfb_ops_blank,
1145
.fb_check_var = dlfb_ops_check_var,
1146
.fb_set_par = dlfb_ops_set_par,
1151
* Assumes &info->lock held by caller
1152
* Assumes no active clients have framebuffer open
1154
static int dlfb_realloc_framebuffer(struct dlfb_data *dev, struct fb_info *info)
1156
int retval = -ENOMEM;
1157
int old_len = info->fix.smem_len;
1159
unsigned char *old_fb = info->screen_base;
1160
unsigned char *new_fb;
1161
unsigned char *new_back = 0;
1163
pr_warn("Reallocating framebuffer. Addresses will change!\n");
1165
new_len = info->fix.line_length * info->var.yres;
1167
if (PAGE_ALIGN(new_len) > old_len) {
1169
* Alloc system memory for virtual framebuffer
1171
new_fb = vmalloc(new_len);
1173
pr_err("Virtual framebuffer alloc failed\n");
1177
if (info->screen_base) {
1178
memcpy(new_fb, old_fb, old_len);
1179
vfree(info->screen_base);
1182
info->screen_base = new_fb;
1183
info->fix.smem_len = PAGE_ALIGN(new_len);
1184
info->fix.smem_start = (unsigned long) new_fb;
1185
info->flags = udlfb_info_flags;
1188
* Second framebuffer copy to mirror the framebuffer state
1189
* on the physical USB device. We can function without this.
1190
* But with imperfect damage info we may send pixels over USB
1191
* that were, in fact, unchanged - wasting limited USB bandwidth
1194
new_back = vzalloc(new_len);
1196
pr_info("No shadow/backing buffer allocated\n");
1198
if (dev->backing_buffer)
1199
vfree(dev->backing_buffer);
1200
dev->backing_buffer = new_back;
1211
* 1) Get EDID from hw, or use sw default
1212
* 2) Parse into various fb_info structs
1213
* 3) Allocate virtual framebuffer memory to back highest res mode
1215
* Parses EDID into three places used by various parts of fbdev:
1216
* fb_var_screeninfo contains the timing of the monitor's preferred mode
1217
* fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1218
* fb_info.modelist is a linked list of all monitor & VESA modes which work
1220
* If EDID is not readable/valid, then modelist is all VESA modes,
1221
* monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1222
* Returns 0 if successful
1224
static int dlfb_setup_modes(struct dlfb_data *dev,
1225
struct fb_info *info,
1226
char *default_edid, size_t default_edid_size)
1229
const struct fb_videomode *default_vmode = NULL;
1234
if (info->dev) /* only use mutex if info has been registered */
1235
mutex_lock(&info->lock);
1237
edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1243
fb_destroy_modelist(&info->modelist);
1244
memset(&info->monspecs, 0, sizeof(info->monspecs));
1247
* Try to (re)read EDID from hardware first
1248
* EDID data may return, but not parse as valid
1249
* Try again a few times, in case of e.g. analog cable noise
1253
i = dlfb_get_edid(dev, edid, EDID_LENGTH);
1255
if (i >= EDID_LENGTH)
1256
fb_edid_to_monspecs(edid, &info->monspecs);
1258
if (info->monspecs.modedb_len > 0) {
1265
/* If that fails, use a previously returned EDID if available */
1266
if (info->monspecs.modedb_len == 0) {
1268
pr_err("Unable to get valid EDID from device/display\n");
1271
fb_edid_to_monspecs(dev->edid, &info->monspecs);
1272
if (info->monspecs.modedb_len > 0)
1273
pr_err("Using previously queried EDID\n");
1277
/* If that fails, use the default EDID we were handed */
1278
if (info->monspecs.modedb_len == 0) {
1279
if (default_edid_size >= EDID_LENGTH) {
1280
fb_edid_to_monspecs(default_edid, &info->monspecs);
1281
if (info->monspecs.modedb_len > 0) {
1282
memcpy(edid, default_edid, default_edid_size);
1284
dev->edid_size = default_edid_size;
1285
pr_err("Using default/backup EDID\n");
1290
/* If we've got modes, let's pick a best default mode */
1291
if (info->monspecs.modedb_len > 0) {
1293
for (i = 0; i < info->monspecs.modedb_len; i++) {
1294
if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info))
1295
fb_add_videomode(&info->monspecs.modedb[i],
1299
/* if we've removed top/best mode */
1301
&= ~FB_MISC_1ST_DETAIL;
1305
default_vmode = fb_find_best_display(&info->monspecs,
1309
/* If everything else has failed, fall back to safe default mode */
1310
if (default_vmode == NULL) {
1312
struct fb_videomode fb_vmode = {0};
1315
* Add the standard VESA modes to our modelist
1316
* Since we don't have EDID, there may be modes that
1317
* overspec monitor and/or are incorrect aspect ratio, etc.
1318
* But at least the user has a chance to choose
1320
for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1321
if (dlfb_is_valid_mode((struct fb_videomode *)
1322
&vesa_modes[i], info))
1323
fb_add_videomode(&vesa_modes[i],
1328
* default to resolution safe for projectors
1329
* (since they are most common case without EDID)
1331
fb_vmode.xres = 800;
1332
fb_vmode.yres = 600;
1333
fb_vmode.refresh = 60;
1334
default_vmode = fb_find_nearest_mode(&fb_vmode,
1338
/* If we have good mode and no active clients*/
1339
if ((default_vmode != NULL) && (dev->fb_count == 0)) {
1341
fb_videomode_to_var(&info->var, default_vmode);
1342
dlfb_var_color_format(&info->var);
1345
* with mode size info, we can now alloc our framebuffer.
1347
memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix));
1348
info->fix.line_length = info->var.xres *
1349
(info->var.bits_per_pixel / 8);
1351
result = dlfb_realloc_framebuffer(dev, info);
1357
if (edid && (dev->edid != edid))
1361
mutex_unlock(&info->lock);
1366
static ssize_t metrics_bytes_rendered_show(struct device *fbdev,
1367
struct device_attribute *a, char *buf) {
1368
struct fb_info *fb_info = dev_get_drvdata(fbdev);
1369
struct dlfb_data *dev = fb_info->par;
1370
return snprintf(buf, PAGE_SIZE, "%u\n",
1371
atomic_read(&dev->bytes_rendered));
1374
static ssize_t metrics_bytes_identical_show(struct device *fbdev,
1375
struct device_attribute *a, char *buf) {
1376
struct fb_info *fb_info = dev_get_drvdata(fbdev);
1377
struct dlfb_data *dev = fb_info->par;
1378
return snprintf(buf, PAGE_SIZE, "%u\n",
1379
atomic_read(&dev->bytes_identical));
1382
static ssize_t metrics_bytes_sent_show(struct device *fbdev,
1383
struct device_attribute *a, char *buf) {
1384
struct fb_info *fb_info = dev_get_drvdata(fbdev);
1385
struct dlfb_data *dev = fb_info->par;
1386
return snprintf(buf, PAGE_SIZE, "%u\n",
1387
atomic_read(&dev->bytes_sent));
1390
static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev,
1391
struct device_attribute *a, char *buf) {
1392
struct fb_info *fb_info = dev_get_drvdata(fbdev);
1393
struct dlfb_data *dev = fb_info->par;
1394
return snprintf(buf, PAGE_SIZE, "%u\n",
1395
atomic_read(&dev->cpu_kcycles_used));
1398
static ssize_t edid_show(
1400
struct kobject *kobj, struct bin_attribute *a,
1401
char *buf, loff_t off, size_t count) {
1402
struct device *fbdev = container_of(kobj, struct device, kobj);
1403
struct fb_info *fb_info = dev_get_drvdata(fbdev);
1404
struct dlfb_data *dev = fb_info->par;
1406
if (dev->edid == NULL)
1409
if ((off >= dev->edid_size) || (count > dev->edid_size))
1412
if (off + count > dev->edid_size)
1413
count = dev->edid_size - off;
1415
pr_info("sysfs edid copy %p to %p, %d bytes\n",
1416
dev->edid, buf, (int) count);
1418
memcpy(buf, dev->edid, count);
1423
static ssize_t edid_store(
1425
struct kobject *kobj, struct bin_attribute *a,
1426
char *src, loff_t src_off, size_t src_size) {
1427
struct device *fbdev = container_of(kobj, struct device, kobj);
1428
struct fb_info *fb_info = dev_get_drvdata(fbdev);
1429
struct dlfb_data *dev = fb_info->par;
1431
/* We only support write of entire EDID at once, no offset*/
1432
if ((src_size != EDID_LENGTH) || (src_off != 0))
1435
dlfb_setup_modes(dev, fb_info, src, src_size);
1437
if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) {
1438
pr_info("sysfs written EDID is new default\n");
1439
dlfb_ops_set_par(fb_info);
1445
static ssize_t metrics_reset_store(struct device *fbdev,
1446
struct device_attribute *attr,
1447
const char *buf, size_t count)
1449
struct fb_info *fb_info = dev_get_drvdata(fbdev);
1450
struct dlfb_data *dev = fb_info->par;
1452
atomic_set(&dev->bytes_rendered, 0);
1453
atomic_set(&dev->bytes_identical, 0);
1454
atomic_set(&dev->bytes_sent, 0);
1455
atomic_set(&dev->cpu_kcycles_used, 0);
1460
static struct bin_attribute edid_attr = {
1461
.attr.name = "edid",
1463
.size = EDID_LENGTH,
1468
static struct device_attribute fb_device_attrs[] = {
1469
__ATTR_RO(metrics_bytes_rendered),
1470
__ATTR_RO(metrics_bytes_identical),
1471
__ATTR_RO(metrics_bytes_sent),
1472
__ATTR_RO(metrics_cpu_kcycles_used),
1473
__ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store),
1477
* This is necessary before we can communicate with the display controller.
1479
static int dlfb_select_std_channel(struct dlfb_data *dev)
1482
u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7,
1483
0x1C, 0x88, 0x5E, 0x15,
1484
0x60, 0xFE, 0xC6, 0x97,
1485
0x16, 0x3D, 0x47, 0xF2 };
1487
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1488
NR_USB_REQUEST_CHANNEL,
1489
(USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
1490
set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT);
1494
static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev,
1495
struct usb_interface *interface)
1503
buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
1508
total_len = usb_get_descriptor(interface_to_usbdev(interface),
1509
0x5f, /* vendor specific */
1510
0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
1512
/* if not found, look in configuration descriptor */
1513
if (total_len < 0) {
1514
if (0 == usb_get_extra_descriptor(interface->cur_altsetting,
1516
total_len = (int) desc[0];
1519
if (total_len > 5) {
1520
pr_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \
1521
"%02x %02x %02x %02x %02x %02x %02x\n",
1523
desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
1524
desc[7], desc[8], desc[9], desc[10]);
1526
if ((desc[0] != total_len) || /* descriptor length */
1527
(desc[1] != 0x5f) || /* vendor descriptor type */
1528
(desc[2] != 0x01) || /* version (2 bytes) */
1529
(desc[3] != 0x00) ||
1530
(desc[4] != total_len - 2)) /* length after type */
1533
desc_end = desc + total_len;
1534
desc += 5; /* the fixed header we've already parsed */
1536
while (desc < desc_end) {
1540
key = *((u16 *) desc);
1541
desc += sizeof(u16);
1546
case 0x0200: { /* max_area */
1548
max_area = le32_to_cpu(*((u32 *)desc));
1549
pr_warn("DL chip limited to %d pixel modes\n",
1551
dev->sku_pixel_limit = max_area;
1560
pr_info("vendor descriptor not available (%d)\n", total_len);
1566
/* allow udlfb to load for now even if firmware unrecognized */
1567
pr_err("Unrecognized vendor firmware descriptor\n");
1573
static int dlfb_usb_probe(struct usb_interface *interface,
1574
const struct usb_device_id *id)
1576
struct usb_device *usbdev;
1577
struct dlfb_data *dev = 0;
1578
struct fb_info *info = 0;
1579
int retval = -ENOMEM;
1582
/* usb initialization */
1584
usbdev = interface_to_usbdev(interface);
1586
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1588
err("dlfb_usb_probe: failed alloc of dev struct\n");
1592
/* we need to wait for both usb and fbdev to spin down on disconnect */
1593
kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
1594
kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
1597
dev->gdev = &usbdev->dev; /* our generic struct device * */
1598
usb_set_intfdata(interface, dev);
1600
pr_info("%s %s - serial #%s\n",
1601
usbdev->manufacturer, usbdev->product, usbdev->serial);
1602
pr_info("vid_%04x&pid_%04x&rev_%04x driver's dlfb_data struct at %p\n",
1603
usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
1604
usbdev->descriptor.bcdDevice, dev);
1605
pr_info("console enable=%d\n", console);
1606
pr_info("fb_defio enable=%d\n", fb_defio);
1607
pr_info("shadow enable=%d\n", shadow);
1609
dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */
1611
if (!dlfb_parse_vendor_descriptor(dev, interface)) {
1612
pr_err("firmware not recognized. Assume incompatible device\n");
1616
if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1618
pr_err("dlfb_alloc_urb_list failed\n");
1622
/* We don't register a new USB class. Our client interface is fbdev */
1624
/* allocates framebuffer driver structure, not framebuffer memory */
1625
info = framebuffer_alloc(0, &interface->dev);
1628
pr_err("framebuffer_alloc failed\n");
1634
info->pseudo_palette = dev->pseudo_palette;
1635
info->fbops = &dlfb_ops;
1637
retval = fb_alloc_cmap(&info->cmap, 256, 0);
1639
pr_err("fb_alloc_cmap failed %x\n", retval);
1643
INIT_DELAYED_WORK(&dev->free_framebuffer_work,
1644
dlfb_free_framebuffer_work);
1646
INIT_LIST_HEAD(&info->modelist);
1648
retval = dlfb_setup_modes(dev, info, NULL, 0);
1650
pr_err("unable to find common mode for display and adapter\n");
1654
/* ready to begin using device */
1656
atomic_set(&dev->usb_active, 1);
1657
dlfb_select_std_channel(dev);
1659
dlfb_ops_check_var(&info->var, info);
1660
dlfb_ops_set_par(info);
1662
retval = register_framebuffer(info);
1664
pr_err("register_framebuffer failed %d\n", retval);
1668
for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) {
1669
retval = device_create_file(info->dev, &fb_device_attrs[i]);
1671
pr_err("device_create_file failed %d\n", retval);
1676
retval = device_create_bin_file(info->dev, &edid_attr);
1678
pr_err("device_create_bin_file failed %d\n", retval);
1682
pr_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution."
1683
" Using %dK framebuffer memory\n", info->node,
1684
info->var.xres, info->var.yres,
1685
((dev->backing_buffer) ?
1686
info->fix.smem_len * 2 : info->fix.smem_len) >> 10);
1690
for (i -= 1; i >= 0; i--)
1691
device_remove_file(info->dev, &fb_device_attrs[i]);
1697
if (info->cmap.len != 0)
1698
fb_dealloc_cmap(&info->cmap);
1699
if (info->monspecs.modedb)
1700
fb_destroy_modedb(info->monspecs.modedb);
1701
if (info->screen_base)
1702
vfree(info->screen_base);
1704
fb_destroy_modelist(&info->modelist);
1706
framebuffer_release(info);
1709
if (dev->backing_buffer)
1710
vfree(dev->backing_buffer);
1712
kref_put(&dev->kref, dlfb_free); /* ref for framebuffer */
1713
kref_put(&dev->kref, dlfb_free); /* last ref from kref_init */
1715
/* dev has been deallocated. Do not dereference */
1721
static void dlfb_usb_disconnect(struct usb_interface *interface)
1723
struct dlfb_data *dev;
1724
struct fb_info *info;
1727
dev = usb_get_intfdata(interface);
1730
pr_info("USB disconnect starting\n");
1732
/* we virtualize until all fb clients release. Then we free */
1733
dev->virtualized = true;
1735
/* When non-active we'll update virtual framebuffer, but no new urbs */
1736
atomic_set(&dev->usb_active, 0);
1738
/* remove udlfb's sysfs interfaces */
1739
for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
1740
device_remove_file(info->dev, &fb_device_attrs[i]);
1741
device_remove_bin_file(info->dev, &edid_attr);
1743
usb_set_intfdata(interface, NULL);
1745
/* if clients still have us open, will be freed on last close */
1746
if (dev->fb_count == 0)
1747
schedule_delayed_work(&dev->free_framebuffer_work, 0);
1749
/* release reference taken by kref_init in probe() */
1750
kref_put(&dev->kref, dlfb_free);
1752
/* consider dlfb_data freed */
1757
static struct usb_driver dlfb_driver = {
1759
.probe = dlfb_usb_probe,
1760
.disconnect = dlfb_usb_disconnect,
1761
.id_table = id_table,
1764
static int __init dlfb_module_init(void)
1768
res = usb_register(&dlfb_driver);
1770
err("usb_register failed. Error number %d", res);
1775
static void __exit dlfb_module_exit(void)
1777
usb_deregister(&dlfb_driver);
1780
module_init(dlfb_module_init);
1781
module_exit(dlfb_module_exit);
1783
static void dlfb_urb_completion(struct urb *urb)
1785
struct urb_node *unode = urb->context;
1786
struct dlfb_data *dev = unode->dev;
1787
unsigned long flags;
1789
/* sync/async unlink faults aren't errors */
1791
if (!(urb->status == -ENOENT ||
1792
urb->status == -ECONNRESET ||
1793
urb->status == -ESHUTDOWN)) {
1794
pr_err("%s - nonzero write bulk status received: %d\n",
1795
__func__, urb->status);
1796
atomic_set(&dev->lost_pixels, 1);
1800
urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
1802
spin_lock_irqsave(&dev->urbs.lock, flags);
1803
list_add_tail(&unode->entry, &dev->urbs.list);
1804
dev->urbs.available++;
1805
spin_unlock_irqrestore(&dev->urbs.lock, flags);
1808
* When using fb_defio, we deadlock if up() is called
1809
* while another is waiting. So queue to another process.
1812
schedule_delayed_work(&unode->release_urb_work, 0);
1814
up(&dev->urbs.limit_sem);
1817
static void dlfb_free_urb_list(struct dlfb_data *dev)
1819
int count = dev->urbs.count;
1820
struct list_head *node;
1821
struct urb_node *unode;
1824
unsigned long flags;
1826
pr_notice("Waiting for completes and freeing all render urbs\n");
1828
/* keep waiting and freeing, until we've got 'em all */
1831
/* Getting interrupted means a leak, but ok at shutdown*/
1832
ret = down_interruptible(&dev->urbs.limit_sem);
1836
spin_lock_irqsave(&dev->urbs.lock, flags);
1838
node = dev->urbs.list.next; /* have reserved one with sem */
1839
list_del_init(node);
1841
spin_unlock_irqrestore(&dev->urbs.lock, flags);
1843
unode = list_entry(node, struct urb_node, entry);
1846
/* Free each separately allocated piece */
1847
usb_free_coherent(urb->dev, dev->urbs.size,
1848
urb->transfer_buffer, urb->transfer_dma);
1855
static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size)
1859
struct urb_node *unode;
1862
spin_lock_init(&dev->urbs.lock);
1864
dev->urbs.size = size;
1865
INIT_LIST_HEAD(&dev->urbs.list);
1868
unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
1873
INIT_DELAYED_WORK(&unode->release_urb_work,
1874
dlfb_release_urb_work);
1876
urb = usb_alloc_urb(0, GFP_KERNEL);
1883
buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL,
1884
&urb->transfer_dma);
1891
/* urb->transfer_buffer_length set to actual before submit */
1892
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
1893
buf, size, dlfb_urb_completion, unode);
1894
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1896
list_add_tail(&unode->entry, &dev->urbs.list);
1901
sema_init(&dev->urbs.limit_sem, i);
1902
dev->urbs.count = i;
1903
dev->urbs.available = i;
1905
pr_notice("allocated %d %d byte urbs\n", i, (int) size);
1910
static struct urb *dlfb_get_urb(struct dlfb_data *dev)
1913
struct list_head *entry;
1914
struct urb_node *unode;
1915
struct urb *urb = NULL;
1916
unsigned long flags;
1918
/* Wait for an in-flight buffer to complete and get re-queued */
1919
ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
1921
atomic_set(&dev->lost_pixels, 1);
1922
pr_warn("wait for urb interrupted: %x available: %d\n",
1923
ret, dev->urbs.available);
1927
spin_lock_irqsave(&dev->urbs.lock, flags);
1929
BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
1930
entry = dev->urbs.list.next;
1931
list_del_init(entry);
1932
dev->urbs.available--;
1934
spin_unlock_irqrestore(&dev->urbs.lock, flags);
1936
unode = list_entry(entry, struct urb_node, entry);
1943
static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len)
1947
BUG_ON(len > dev->urbs.size);
1949
urb->transfer_buffer_length = len; /* set to actual payload len */
1950
ret = usb_submit_urb(urb, GFP_KERNEL);
1952
dlfb_urb_completion(urb); /* because no one else will */
1953
atomic_set(&dev->lost_pixels, 1);
1954
pr_err("usb_submit_urb error %x\n", ret);
1959
module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1960
MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer");
1962
module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1963
MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes");
1965
module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1966
MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf");
1968
MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, "
1969
"Jaya Kumar <jayakumar.lkml@gmail.com>, "
1970
"Bernie Thompson <bernie@plugable.com>");
1971
MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver");
1972
MODULE_LICENSE("GPL");