1 /*
2 * linux/drivers/video/fbmem.c
3 *
4 * Copyright (C) 1994 Martin Schaller
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive
11 * for more details.
12 */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/major.h>
21 #include <linux/slab.h>
22 #include <linux/mm.h>
23 #include <linux/mman.h>
24 #include <linux/vt.h>
25 #include <linux/init.h>
26 #include <linux/linux_logo.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/console.h>
30 #include <linux/kmod.h>
31 #include <linux/err.h>
32 #include <linux/device.h>
33 #include <linux/efi.h>
34 #include <linux/fb.h>
35 #include <linux/overflow.h>
36
37 #include <asm/fb.h>
38
39
40 /*
41 * Frame buffer device initialization and setup routines
42 */
43
44 #define FBPIXMAPSIZE (1024 * 8)
45
46 static DEFINE_MUTEX(registration_lock);
47
48 struct fb_info *registered_fb[FB_MAX] __read_mostly;
49 EXPORT_SYMBOL(registered_fb);
50
51 int num_registered_fb __read_mostly;
52 EXPORT_SYMBOL(num_registered_fb);
53
get_fb_info(unsigned int idx)54 static struct fb_info *get_fb_info(unsigned int idx)
55 {
56 struct fb_info *fb_info;
57
58 if (idx >= FB_MAX)
59 return ERR_PTR(-ENODEV);
60
61 mutex_lock(®istration_lock);
62 fb_info = registered_fb[idx];
63 if (fb_info)
64 atomic_inc(&fb_info->count);
65 mutex_unlock(®istration_lock);
66
67 return fb_info;
68 }
69
put_fb_info(struct fb_info * fb_info)70 static void put_fb_info(struct fb_info *fb_info)
71 {
72 if (!atomic_dec_and_test(&fb_info->count))
73 return;
74 if (fb_info->fbops->fb_destroy)
75 fb_info->fbops->fb_destroy(fb_info);
76 }
77
lock_fb_info(struct fb_info * info)78 int lock_fb_info(struct fb_info *info)
79 {
80 mutex_lock(&info->lock);
81 if (!info->fbops) {
82 mutex_unlock(&info->lock);
83 return 0;
84 }
85 return 1;
86 }
87 EXPORT_SYMBOL(lock_fb_info);
88
89 /*
90 * Helpers
91 */
92
fb_get_color_depth(struct fb_var_screeninfo * var,struct fb_fix_screeninfo * fix)93 int fb_get_color_depth(struct fb_var_screeninfo *var,
94 struct fb_fix_screeninfo *fix)
95 {
96 int depth = 0;
97
98 if (fix->visual == FB_VISUAL_MONO01 ||
99 fix->visual == FB_VISUAL_MONO10)
100 depth = 1;
101 else {
102 if (var->green.length == var->blue.length &&
103 var->green.length == var->red.length &&
104 var->green.offset == var->blue.offset &&
105 var->green.offset == var->red.offset)
106 depth = var->green.length;
107 else
108 depth = var->green.length + var->red.length +
109 var->blue.length;
110 }
111
112 return depth;
113 }
114 EXPORT_SYMBOL(fb_get_color_depth);
115
116 /*
117 * Data padding functions.
118 */
fb_pad_aligned_buffer(u8 * dst,u32 d_pitch,u8 * src,u32 s_pitch,u32 height)119 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
120 {
121 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
122 }
123 EXPORT_SYMBOL(fb_pad_aligned_buffer);
124
fb_pad_unaligned_buffer(u8 * dst,u32 d_pitch,u8 * src,u32 idx,u32 height,u32 shift_high,u32 shift_low,u32 mod)125 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
126 u32 shift_high, u32 shift_low, u32 mod)
127 {
128 u8 mask = (u8) (0xfff << shift_high), tmp;
129 int i, j;
130
131 for (i = height; i--; ) {
132 for (j = 0; j < idx; j++) {
133 tmp = dst[j];
134 tmp &= mask;
135 tmp |= *src >> shift_low;
136 dst[j] = tmp;
137 tmp = *src << shift_high;
138 dst[j+1] = tmp;
139 src++;
140 }
141 tmp = dst[idx];
142 tmp &= mask;
143 tmp |= *src >> shift_low;
144 dst[idx] = tmp;
145 if (shift_high < mod) {
146 tmp = *src << shift_high;
147 dst[idx+1] = tmp;
148 }
149 src++;
150 dst += d_pitch;
151 }
152 }
153 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
154
155 /*
156 * we need to lock this section since fb_cursor
157 * may use fb_imageblit()
158 */
fb_get_buffer_offset(struct fb_info * info,struct fb_pixmap * buf,u32 size)159 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
160 {
161 u32 align = buf->buf_align - 1, offset;
162 char *addr = buf->addr;
163
164 /* If IO mapped, we need to sync before access, no sharing of
165 * the pixmap is done
166 */
167 if (buf->flags & FB_PIXMAP_IO) {
168 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
169 info->fbops->fb_sync(info);
170 return addr;
171 }
172
173 /* See if we fit in the remaining pixmap space */
174 offset = buf->offset + align;
175 offset &= ~align;
176 if (offset + size > buf->size) {
177 /* We do not fit. In order to be able to re-use the buffer,
178 * we must ensure no asynchronous DMA'ing or whatever operation
179 * is in progress, we sync for that.
180 */
181 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
182 info->fbops->fb_sync(info);
183 offset = 0;
184 }
185 buf->offset = offset + size;
186 addr += offset;
187
188 return addr;
189 }
190 EXPORT_SYMBOL(fb_get_buffer_offset);
191
192 #ifdef CONFIG_LOGO
193
safe_shift(unsigned d,int n)194 static inline unsigned safe_shift(unsigned d, int n)
195 {
196 return n < 0 ? d >> -n : d << n;
197 }
198
fb_set_logocmap(struct fb_info * info,const struct linux_logo * logo)199 static void fb_set_logocmap(struct fb_info *info,
200 const struct linux_logo *logo)
201 {
202 struct fb_cmap palette_cmap;
203 u16 palette_green[16];
204 u16 palette_blue[16];
205 u16 palette_red[16];
206 int i, j, n;
207 const unsigned char *clut = logo->clut;
208
209 palette_cmap.start = 0;
210 palette_cmap.len = 16;
211 palette_cmap.red = palette_red;
212 palette_cmap.green = palette_green;
213 palette_cmap.blue = palette_blue;
214 palette_cmap.transp = NULL;
215
216 for (i = 0; i < logo->clutsize; i += n) {
217 n = logo->clutsize - i;
218 /* palette_cmap provides space for only 16 colors at once */
219 if (n > 16)
220 n = 16;
221 palette_cmap.start = 32 + i;
222 palette_cmap.len = n;
223 for (j = 0; j < n; ++j) {
224 palette_cmap.red[j] = clut[0] << 8 | clut[0];
225 palette_cmap.green[j] = clut[1] << 8 | clut[1];
226 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
227 clut += 3;
228 }
229 fb_set_cmap(&palette_cmap, info);
230 }
231 }
232
fb_set_logo_truepalette(struct fb_info * info,const struct linux_logo * logo,u32 * palette)233 static void fb_set_logo_truepalette(struct fb_info *info,
234 const struct linux_logo *logo,
235 u32 *palette)
236 {
237 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
238 unsigned char redmask, greenmask, bluemask;
239 int redshift, greenshift, blueshift;
240 int i;
241 const unsigned char *clut = logo->clut;
242
243 /*
244 * We have to create a temporary palette since console palette is only
245 * 16 colors long.
246 */
247 /* Bug: Doesn't obey msb_right ... (who needs that?) */
248 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
249 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
250 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
251 redshift = info->var.red.offset - (8 - info->var.red.length);
252 greenshift = info->var.green.offset - (8 - info->var.green.length);
253 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
254
255 for ( i = 0; i < logo->clutsize; i++) {
256 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
257 safe_shift((clut[1] & greenmask), greenshift) |
258 safe_shift((clut[2] & bluemask), blueshift));
259 clut += 3;
260 }
261 }
262
fb_set_logo_directpalette(struct fb_info * info,const struct linux_logo * logo,u32 * palette)263 static void fb_set_logo_directpalette(struct fb_info *info,
264 const struct linux_logo *logo,
265 u32 *palette)
266 {
267 int redshift, greenshift, blueshift;
268 int i;
269
270 redshift = info->var.red.offset;
271 greenshift = info->var.green.offset;
272 blueshift = info->var.blue.offset;
273
274 for (i = 32; i < 32 + logo->clutsize; i++)
275 palette[i] = i << redshift | i << greenshift | i << blueshift;
276 }
277
fb_set_logo(struct fb_info * info,const struct linux_logo * logo,u8 * dst,int depth)278 static void fb_set_logo(struct fb_info *info,
279 const struct linux_logo *logo, u8 *dst,
280 int depth)
281 {
282 int i, j, k;
283 const u8 *src = logo->data;
284 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
285 u8 fg = 1, d;
286
287 switch (fb_get_color_depth(&info->var, &info->fix)) {
288 case 1:
289 fg = 1;
290 break;
291 case 2:
292 fg = 3;
293 break;
294 default:
295 fg = 7;
296 break;
297 }
298
299 if (info->fix.visual == FB_VISUAL_MONO01 ||
300 info->fix.visual == FB_VISUAL_MONO10)
301 fg = ~((u8) (0xfff << info->var.green.length));
302
303 switch (depth) {
304 case 4:
305 for (i = 0; i < logo->height; i++)
306 for (j = 0; j < logo->width; src++) {
307 *dst++ = *src >> 4;
308 j++;
309 if (j < logo->width) {
310 *dst++ = *src & 0x0f;
311 j++;
312 }
313 }
314 break;
315 case 1:
316 for (i = 0; i < logo->height; i++) {
317 for (j = 0; j < logo->width; src++) {
318 d = *src ^ xor;
319 for (k = 7; k >= 0; k--) {
320 *dst++ = ((d >> k) & 1) ? fg : 0;
321 j++;
322 }
323 }
324 }
325 break;
326 }
327 }
328
329 /*
330 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
331 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
332 * the visual format and color depth of the framebuffer, the DAC, the
333 * pseudo_palette, and the logo data will be adjusted accordingly.
334 *
335 * Case 1 - linux_logo_clut224:
336 * Color exceeds the number of console colors (16), thus we set the hardware DAC
337 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
338 *
339 * For visuals that require color info from the pseudo_palette, we also construct
340 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
341 * will be set.
342 *
343 * Case 2 - linux_logo_vga16:
344 * The number of colors just matches the console colors, thus there is no need
345 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
346 * each byte contains color information for two pixels (upper and lower nibble).
347 * To be consistent with fb_imageblit() usage, we therefore separate the two
348 * nibbles into separate bytes. The "depth" flag will be set to 4.
349 *
350 * Case 3 - linux_logo_mono:
351 * This is similar with Case 2. Each byte contains information for 8 pixels.
352 * We isolate each bit and expand each into a byte. The "depth" flag will
353 * be set to 1.
354 */
355 static struct logo_data {
356 int depth;
357 int needs_directpalette;
358 int needs_truepalette;
359 int needs_cmapreset;
360 const struct linux_logo *logo;
361 } fb_logo __read_mostly;
362
fb_rotate_logo_ud(const u8 * in,u8 * out,u32 width,u32 height)363 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
364 {
365 u32 size = width * height, i;
366
367 out += size - 1;
368
369 for (i = size; i--; )
370 *out-- = *in++;
371 }
372
fb_rotate_logo_cw(const u8 * in,u8 * out,u32 width,u32 height)373 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
374 {
375 int i, j, h = height - 1;
376
377 for (i = 0; i < height; i++)
378 for (j = 0; j < width; j++)
379 out[height * j + h - i] = *in++;
380 }
381
fb_rotate_logo_ccw(const u8 * in,u8 * out,u32 width,u32 height)382 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
383 {
384 int i, j, w = width - 1;
385
386 for (i = 0; i < height; i++)
387 for (j = 0; j < width; j++)
388 out[height * (w - j) + i] = *in++;
389 }
390
fb_rotate_logo(struct fb_info * info,u8 * dst,struct fb_image * image,int rotate)391 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
392 struct fb_image *image, int rotate)
393 {
394 u32 tmp;
395
396 if (rotate == FB_ROTATE_UD) {
397 fb_rotate_logo_ud(image->data, dst, image->width,
398 image->height);
399 image->dx = info->var.xres - image->width - image->dx;
400 image->dy = info->var.yres - image->height - image->dy;
401 } else if (rotate == FB_ROTATE_CW) {
402 fb_rotate_logo_cw(image->data, dst, image->width,
403 image->height);
404 tmp = image->width;
405 image->width = image->height;
406 image->height = tmp;
407 tmp = image->dy;
408 image->dy = image->dx;
409 image->dx = info->var.xres - image->width - tmp;
410 } else if (rotate == FB_ROTATE_CCW) {
411 fb_rotate_logo_ccw(image->data, dst, image->width,
412 image->height);
413 tmp = image->width;
414 image->width = image->height;
415 image->height = tmp;
416 tmp = image->dx;
417 image->dx = image->dy;
418 image->dy = info->var.yres - image->height - tmp;
419 }
420
421 image->data = dst;
422 }
423
fb_do_show_logo(struct fb_info * info,struct fb_image * image,int rotate,unsigned int num)424 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
425 int rotate, unsigned int num)
426 {
427 unsigned int x;
428
429 if (image->width > info->var.xres || image->height > info->var.yres)
430 return;
431
432 if (rotate == FB_ROTATE_UR) {
433 for (x = 0;
434 x < num && image->dx + image->width <= info->var.xres;
435 x++) {
436 info->fbops->fb_imageblit(info, image);
437 image->dx += image->width + 8;
438 }
439 } else if (rotate == FB_ROTATE_UD) {
440 u32 dx = image->dx;
441
442 for (x = 0; x < num && image->dx <= dx; x++) {
443 info->fbops->fb_imageblit(info, image);
444 image->dx -= image->width + 8;
445 }
446 } else if (rotate == FB_ROTATE_CW) {
447 for (x = 0;
448 x < num && image->dy + image->height <= info->var.yres;
449 x++) {
450 info->fbops->fb_imageblit(info, image);
451 image->dy += image->height + 8;
452 }
453 } else if (rotate == FB_ROTATE_CCW) {
454 u32 dy = image->dy;
455
456 for (x = 0; x < num && image->dy <= dy; x++) {
457 info->fbops->fb_imageblit(info, image);
458 image->dy -= image->height + 8;
459 }
460 }
461 }
462
fb_show_logo_line(struct fb_info * info,int rotate,const struct linux_logo * logo,int y,unsigned int n)463 static int fb_show_logo_line(struct fb_info *info, int rotate,
464 const struct linux_logo *logo, int y,
465 unsigned int n)
466 {
467 u32 *palette = NULL, *saved_pseudo_palette = NULL;
468 unsigned char *logo_new = NULL, *logo_rotate = NULL;
469 struct fb_image image;
470
471 /* Return if the frame buffer is not mapped or suspended */
472 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
473 info->flags & FBINFO_MODULE)
474 return 0;
475
476 image.depth = 8;
477 image.data = logo->data;
478
479 if (fb_logo.needs_cmapreset)
480 fb_set_logocmap(info, logo);
481
482 if (fb_logo.needs_truepalette ||
483 fb_logo.needs_directpalette) {
484 palette = kmalloc(256 * 4, GFP_KERNEL);
485 if (palette == NULL)
486 return 0;
487
488 if (fb_logo.needs_truepalette)
489 fb_set_logo_truepalette(info, logo, palette);
490 else
491 fb_set_logo_directpalette(info, logo, palette);
492
493 saved_pseudo_palette = info->pseudo_palette;
494 info->pseudo_palette = palette;
495 }
496
497 if (fb_logo.depth <= 4) {
498 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
499 if (logo_new == NULL) {
500 kfree(palette);
501 if (saved_pseudo_palette)
502 info->pseudo_palette = saved_pseudo_palette;
503 return 0;
504 }
505 image.data = logo_new;
506 fb_set_logo(info, logo, logo_new, fb_logo.depth);
507 }
508
509 image.dx = 0;
510 image.dy = y;
511 image.width = logo->width;
512 image.height = logo->height;
513
514 if (rotate) {
515 logo_rotate = kmalloc(logo->width *
516 logo->height, GFP_KERNEL);
517 if (logo_rotate)
518 fb_rotate_logo(info, logo_rotate, &image, rotate);
519 }
520
521 fb_do_show_logo(info, &image, rotate, n);
522
523 kfree(palette);
524 if (saved_pseudo_palette != NULL)
525 info->pseudo_palette = saved_pseudo_palette;
526 kfree(logo_new);
527 kfree(logo_rotate);
528 return logo->height;
529 }
530
531
532 #ifdef CONFIG_FB_LOGO_EXTRA
533
534 #define FB_LOGO_EX_NUM_MAX 10
535 static struct logo_data_extra {
536 const struct linux_logo *logo;
537 unsigned int n;
538 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
539 static unsigned int fb_logo_ex_num;
540
fb_append_extra_logo(const struct linux_logo * logo,unsigned int n)541 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
542 {
543 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
544 return;
545
546 fb_logo_ex[fb_logo_ex_num].logo = logo;
547 fb_logo_ex[fb_logo_ex_num].n = n;
548 fb_logo_ex_num++;
549 }
550
fb_prepare_extra_logos(struct fb_info * info,unsigned int height,unsigned int yres)551 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
552 unsigned int yres)
553 {
554 unsigned int i;
555
556 /* FIXME: logo_ex supports only truecolor fb. */
557 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
558 fb_logo_ex_num = 0;
559
560 for (i = 0; i < fb_logo_ex_num; i++) {
561 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
562 fb_logo_ex[i].logo = NULL;
563 continue;
564 }
565 height += fb_logo_ex[i].logo->height;
566 if (height > yres) {
567 height -= fb_logo_ex[i].logo->height;
568 fb_logo_ex_num = i;
569 break;
570 }
571 }
572 return height;
573 }
574
fb_show_extra_logos(struct fb_info * info,int y,int rotate)575 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
576 {
577 unsigned int i;
578
579 for (i = 0; i < fb_logo_ex_num; i++)
580 y += fb_show_logo_line(info, rotate,
581 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
582
583 return y;
584 }
585
586 #else /* !CONFIG_FB_LOGO_EXTRA */
587
fb_prepare_extra_logos(struct fb_info * info,unsigned int height,unsigned int yres)588 static inline int fb_prepare_extra_logos(struct fb_info *info,
589 unsigned int height,
590 unsigned int yres)
591 {
592 return height;
593 }
594
fb_show_extra_logos(struct fb_info * info,int y,int rotate)595 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
596 {
597 return y;
598 }
599
600 #endif /* CONFIG_FB_LOGO_EXTRA */
601
602
fb_prepare_logo(struct fb_info * info,int rotate)603 int fb_prepare_logo(struct fb_info *info, int rotate)
604 {
605 int depth = fb_get_color_depth(&info->var, &info->fix);
606 unsigned int yres;
607
608 memset(&fb_logo, 0, sizeof(struct logo_data));
609
610 if (info->flags & FBINFO_MISC_TILEBLITTING ||
611 info->flags & FBINFO_MODULE)
612 return 0;
613
614 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
615 depth = info->var.blue.length;
616 if (info->var.red.length < depth)
617 depth = info->var.red.length;
618 if (info->var.green.length < depth)
619 depth = info->var.green.length;
620 }
621
622 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
623 /* assume console colormap */
624 depth = 4;
625 }
626
627 /* Return if no suitable logo was found */
628 fb_logo.logo = fb_find_logo(depth);
629
630 if (!fb_logo.logo) {
631 return 0;
632 }
633
634 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
635 yres = info->var.yres;
636 else
637 yres = info->var.xres;
638
639 if (fb_logo.logo->height > yres) {
640 fb_logo.logo = NULL;
641 return 0;
642 }
643
644 /* What depth we asked for might be different from what we get */
645 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
646 fb_logo.depth = 8;
647 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
648 fb_logo.depth = 4;
649 else
650 fb_logo.depth = 1;
651
652
653 if (fb_logo.depth > 4 && depth > 4) {
654 switch (info->fix.visual) {
655 case FB_VISUAL_TRUECOLOR:
656 fb_logo.needs_truepalette = 1;
657 break;
658 case FB_VISUAL_DIRECTCOLOR:
659 fb_logo.needs_directpalette = 1;
660 fb_logo.needs_cmapreset = 1;
661 break;
662 case FB_VISUAL_PSEUDOCOLOR:
663 fb_logo.needs_cmapreset = 1;
664 break;
665 }
666 }
667
668 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
669 }
670
fb_show_logo(struct fb_info * info,int rotate)671 int fb_show_logo(struct fb_info *info, int rotate)
672 {
673 int y;
674
675 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
676 num_online_cpus());
677 y = fb_show_extra_logos(info, y, rotate);
678
679 return y;
680 }
681 #else
fb_prepare_logo(struct fb_info * info,int rotate)682 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
fb_show_logo(struct fb_info * info,int rotate)683 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
684 #endif /* CONFIG_LOGO */
685 EXPORT_SYMBOL(fb_prepare_logo);
686 EXPORT_SYMBOL(fb_show_logo);
687
fb_seq_start(struct seq_file * m,loff_t * pos)688 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
689 {
690 mutex_lock(®istration_lock);
691 return (*pos < FB_MAX) ? pos : NULL;
692 }
693
fb_seq_next(struct seq_file * m,void * v,loff_t * pos)694 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
695 {
696 (*pos)++;
697 return (*pos < FB_MAX) ? pos : NULL;
698 }
699
fb_seq_stop(struct seq_file * m,void * v)700 static void fb_seq_stop(struct seq_file *m, void *v)
701 {
702 mutex_unlock(®istration_lock);
703 }
704
fb_seq_show(struct seq_file * m,void * v)705 static int fb_seq_show(struct seq_file *m, void *v)
706 {
707 int i = *(loff_t *)v;
708 struct fb_info *fi = registered_fb[i];
709
710 if (fi)
711 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
712 return 0;
713 }
714
715 static const struct seq_operations proc_fb_seq_ops = {
716 .start = fb_seq_start,
717 .next = fb_seq_next,
718 .stop = fb_seq_stop,
719 .show = fb_seq_show,
720 };
721
proc_fb_open(struct inode * inode,struct file * file)722 static int proc_fb_open(struct inode *inode, struct file *file)
723 {
724 return seq_open(file, &proc_fb_seq_ops);
725 }
726
727 static const struct file_operations fb_proc_fops = {
728 .owner = THIS_MODULE,
729 .open = proc_fb_open,
730 .read = seq_read,
731 .llseek = seq_lseek,
732 .release = seq_release,
733 };
734
735 /*
736 * We hold a reference to the fb_info in file->private_data,
737 * but if the current registered fb has changed, we don't
738 * actually want to use it.
739 *
740 * So look up the fb_info using the inode minor number,
741 * and just verify it against the reference we have.
742 */
file_fb_info(struct file * file)743 static struct fb_info *file_fb_info(struct file *file)
744 {
745 struct inode *inode = file_inode(file);
746 int fbidx = iminor(inode);
747 struct fb_info *info = registered_fb[fbidx];
748
749 if (info != file->private_data)
750 info = NULL;
751 return info;
752 }
753
754 static ssize_t
fb_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)755 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
756 {
757 unsigned long p = *ppos;
758 struct fb_info *info = file_fb_info(file);
759 u8 *buffer, *dst;
760 u8 __iomem *src;
761 int c, cnt = 0, err = 0;
762 unsigned long total_size;
763
764 if (!info || ! info->screen_base)
765 return -ENODEV;
766
767 if (info->state != FBINFO_STATE_RUNNING)
768 return -EPERM;
769
770 if (info->fbops->fb_read)
771 return info->fbops->fb_read(info, buf, count, ppos);
772
773 total_size = info->screen_size;
774
775 if (total_size == 0)
776 total_size = info->fix.smem_len;
777
778 if (p >= total_size)
779 return 0;
780
781 if (count >= total_size)
782 count = total_size;
783
784 if (count + p > total_size)
785 count = total_size - p;
786
787 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
788 GFP_KERNEL);
789 if (!buffer)
790 return -ENOMEM;
791
792 src = (u8 __iomem *) (info->screen_base + p);
793
794 if (info->fbops->fb_sync)
795 info->fbops->fb_sync(info);
796
797 while (count) {
798 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
799 dst = buffer;
800 fb_memcpy_fromfb(dst, src, c);
801 dst += c;
802 src += c;
803
804 if (copy_to_user(buf, buffer, c)) {
805 err = -EFAULT;
806 break;
807 }
808 *ppos += c;
809 buf += c;
810 cnt += c;
811 count -= c;
812 }
813
814 kfree(buffer);
815
816 return (err) ? err : cnt;
817 }
818
819 static ssize_t
fb_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)820 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
821 {
822 unsigned long p = *ppos;
823 struct fb_info *info = file_fb_info(file);
824 u8 *buffer, *src;
825 u8 __iomem *dst;
826 int c, cnt = 0, err = 0;
827 unsigned long total_size;
828
829 if (!info || !info->screen_base)
830 return -ENODEV;
831
832 if (info->state != FBINFO_STATE_RUNNING)
833 return -EPERM;
834
835 if (info->fbops->fb_write)
836 return info->fbops->fb_write(info, buf, count, ppos);
837
838 total_size = info->screen_size;
839
840 if (total_size == 0)
841 total_size = info->fix.smem_len;
842
843 if (p > total_size)
844 return -EFBIG;
845
846 if (count > total_size) {
847 err = -EFBIG;
848 count = total_size;
849 }
850
851 if (count + p > total_size) {
852 if (!err)
853 err = -ENOSPC;
854
855 count = total_size - p;
856 }
857
858 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
859 GFP_KERNEL);
860 if (!buffer)
861 return -ENOMEM;
862
863 dst = (u8 __iomem *) (info->screen_base + p);
864
865 if (info->fbops->fb_sync)
866 info->fbops->fb_sync(info);
867
868 while (count) {
869 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
870 src = buffer;
871
872 if (copy_from_user(src, buf, c)) {
873 err = -EFAULT;
874 break;
875 }
876
877 fb_memcpy_tofb(dst, src, c);
878 dst += c;
879 src += c;
880 *ppos += c;
881 buf += c;
882 cnt += c;
883 count -= c;
884 }
885
886 kfree(buffer);
887
888 return (cnt) ? cnt : err;
889 }
890
891 int
fb_pan_display(struct fb_info * info,struct fb_var_screeninfo * var)892 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
893 {
894 struct fb_fix_screeninfo *fix = &info->fix;
895 unsigned int yres = info->var.yres;
896 int err = 0;
897
898 if (var->yoffset > 0) {
899 if (var->vmode & FB_VMODE_YWRAP) {
900 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
901 err = -EINVAL;
902 else
903 yres = 0;
904 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
905 err = -EINVAL;
906 }
907
908 if (var->xoffset > 0 && (!fix->xpanstep ||
909 (var->xoffset % fix->xpanstep)))
910 err = -EINVAL;
911
912 if (err || !info->fbops->fb_pan_display ||
913 var->yoffset > info->var.yres_virtual - yres ||
914 var->xoffset > info->var.xres_virtual - info->var.xres)
915 return -EINVAL;
916
917 if ((err = info->fbops->fb_pan_display(var, info)))
918 return err;
919 info->var.xoffset = var->xoffset;
920 info->var.yoffset = var->yoffset;
921 if (var->vmode & FB_VMODE_YWRAP)
922 info->var.vmode |= FB_VMODE_YWRAP;
923 else
924 info->var.vmode &= ~FB_VMODE_YWRAP;
925 return 0;
926 }
927 EXPORT_SYMBOL(fb_pan_display);
928
fb_check_caps(struct fb_info * info,struct fb_var_screeninfo * var,u32 activate)929 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
930 u32 activate)
931 {
932 struct fb_event event;
933 struct fb_blit_caps caps, fbcaps;
934 int err = 0;
935
936 memset(&caps, 0, sizeof(caps));
937 memset(&fbcaps, 0, sizeof(fbcaps));
938 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
939 event.info = info;
940 event.data = ∩︀
941 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
942 info->fbops->fb_get_caps(info, &fbcaps, var);
943
944 if (((fbcaps.x ^ caps.x) & caps.x) ||
945 ((fbcaps.y ^ caps.y) & caps.y) ||
946 (fbcaps.len < caps.len))
947 err = -EINVAL;
948
949 return err;
950 }
951
952 int
fb_set_var(struct fb_info * info,struct fb_var_screeninfo * var)953 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
954 {
955 int flags = info->flags;
956 int ret = 0;
957
958 if (var->activate & FB_ACTIVATE_INV_MODE) {
959 struct fb_videomode mode1, mode2;
960
961 fb_var_to_videomode(&mode1, var);
962 fb_var_to_videomode(&mode2, &info->var);
963 /* make sure we don't delete the videomode of current var */
964 ret = fb_mode_is_equal(&mode1, &mode2);
965
966 if (!ret) {
967 struct fb_event event;
968
969 event.info = info;
970 event.data = &mode1;
971 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
972 }
973
974 if (!ret)
975 fb_delete_videomode(&mode1, &info->modelist);
976
977
978 ret = (ret) ? -EINVAL : 0;
979 goto done;
980 }
981
982 if ((var->activate & FB_ACTIVATE_FORCE) ||
983 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
984 u32 activate = var->activate;
985 u32 unused;
986
987 /* When using FOURCC mode, make sure the red, green, blue and
988 * transp fields are set to 0.
989 */
990 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
991 var->grayscale > 1) {
992 if (var->red.offset || var->green.offset ||
993 var->blue.offset || var->transp.offset ||
994 var->red.length || var->green.length ||
995 var->blue.length || var->transp.length ||
996 var->red.msb_right || var->green.msb_right ||
997 var->blue.msb_right || var->transp.msb_right)
998 return -EINVAL;
999 }
1000
1001 if (!info->fbops->fb_check_var) {
1002 *var = info->var;
1003 goto done;
1004 }
1005
1006 /* bitfill_aligned() assumes that it's at least 8x8 */
1007 if (var->xres < 8 || var->yres < 8)
1008 return -EINVAL;
1009
1010 /* Too huge resolution causes multiplication overflow. */
1011 if (check_mul_overflow(var->xres, var->yres, &unused) ||
1012 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
1013 return -EINVAL;
1014
1015 ret = info->fbops->fb_check_var(var, info);
1016
1017 if (ret)
1018 goto done;
1019
1020 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1021 struct fb_var_screeninfo old_var;
1022 struct fb_videomode mode;
1023
1024 if (info->fbops->fb_get_caps) {
1025 ret = fb_check_caps(info, var, activate);
1026
1027 if (ret)
1028 goto done;
1029 }
1030
1031 old_var = info->var;
1032 info->var = *var;
1033
1034 if (info->fbops->fb_set_par) {
1035 ret = info->fbops->fb_set_par(info);
1036
1037 if (ret) {
1038 info->var = old_var;
1039 printk(KERN_WARNING "detected "
1040 "fb_set_par error, "
1041 "error code: %d\n", ret);
1042 goto done;
1043 }
1044 }
1045
1046 fb_pan_display(info, &info->var);
1047 fb_set_cmap(&info->cmap, info);
1048 fb_var_to_videomode(&mode, &info->var);
1049
1050 if (info->modelist.prev && info->modelist.next &&
1051 !list_empty(&info->modelist))
1052 ret = fb_add_videomode(&mode, &info->modelist);
1053
1054 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1055 struct fb_event event;
1056 int evnt = (activate & FB_ACTIVATE_ALL) ?
1057 FB_EVENT_MODE_CHANGE_ALL :
1058 FB_EVENT_MODE_CHANGE;
1059
1060 info->flags &= ~FBINFO_MISC_USEREVENT;
1061 event.info = info;
1062 event.data = &mode;
1063 fb_notifier_call_chain(evnt, &event);
1064 }
1065 }
1066 }
1067
1068 done:
1069 return ret;
1070 }
1071 EXPORT_SYMBOL(fb_set_var);
1072
1073 int
fb_blank(struct fb_info * info,int blank)1074 fb_blank(struct fb_info *info, int blank)
1075 {
1076 struct fb_event event;
1077 int ret = -EINVAL, early_ret;
1078
1079 if (blank > FB_BLANK_POWERDOWN)
1080 blank = FB_BLANK_POWERDOWN;
1081
1082 event.info = info;
1083 event.data = ␣
1084
1085 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1086
1087 if (info->fbops->fb_blank)
1088 ret = info->fbops->fb_blank(blank, info);
1089
1090 if (!ret)
1091 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1092 else {
1093 /*
1094 * if fb_blank is failed then revert effects of
1095 * the early blank event.
1096 */
1097 if (!early_ret)
1098 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1099 }
1100
1101 return ret;
1102 }
1103 EXPORT_SYMBOL(fb_blank);
1104
do_fb_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)1105 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1106 unsigned long arg)
1107 {
1108 struct fb_ops *fb;
1109 struct fb_var_screeninfo var;
1110 struct fb_fix_screeninfo fix;
1111 struct fb_con2fbmap con2fb;
1112 struct fb_cmap cmap_from;
1113 struct fb_cmap_user cmap;
1114 struct fb_event event;
1115 void __user *argp = (void __user *)arg;
1116 long ret = 0;
1117
1118 switch (cmd) {
1119 case FBIOGET_VSCREENINFO:
1120 if (!lock_fb_info(info))
1121 return -ENODEV;
1122 var = info->var;
1123 unlock_fb_info(info);
1124
1125 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1126 break;
1127 case FBIOPUT_VSCREENINFO:
1128 if (copy_from_user(&var, argp, sizeof(var)))
1129 return -EFAULT;
1130 console_lock();
1131 if (!lock_fb_info(info)) {
1132 console_unlock();
1133 return -ENODEV;
1134 }
1135 info->flags |= FBINFO_MISC_USEREVENT;
1136 ret = fb_set_var(info, &var);
1137 info->flags &= ~FBINFO_MISC_USEREVENT;
1138 unlock_fb_info(info);
1139 console_unlock();
1140 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1141 ret = -EFAULT;
1142 break;
1143 case FBIOGET_FSCREENINFO:
1144 if (!lock_fb_info(info))
1145 return -ENODEV;
1146 memcpy(&fix, &info->fix, sizeof(fix));
1147 unlock_fb_info(info);
1148
1149 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1150 break;
1151 case FBIOPUTCMAP:
1152 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1153 return -EFAULT;
1154 ret = fb_set_user_cmap(&cmap, info);
1155 break;
1156 case FBIOGETCMAP:
1157 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1158 return -EFAULT;
1159 if (!lock_fb_info(info))
1160 return -ENODEV;
1161 cmap_from = info->cmap;
1162 unlock_fb_info(info);
1163 ret = fb_cmap_to_user(&cmap_from, &cmap);
1164 break;
1165 case FBIOPAN_DISPLAY:
1166 if (copy_from_user(&var, argp, sizeof(var)))
1167 return -EFAULT;
1168 console_lock();
1169 if (!lock_fb_info(info)) {
1170 console_unlock();
1171 return -ENODEV;
1172 }
1173 ret = fb_pan_display(info, &var);
1174 unlock_fb_info(info);
1175 console_unlock();
1176 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1177 return -EFAULT;
1178 break;
1179 case FBIO_CURSOR:
1180 ret = -EINVAL;
1181 break;
1182 case FBIOGET_CON2FBMAP:
1183 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1184 return -EFAULT;
1185 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1186 return -EINVAL;
1187 con2fb.framebuffer = -1;
1188 event.data = &con2fb;
1189 if (!lock_fb_info(info))
1190 return -ENODEV;
1191 event.info = info;
1192 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1193 unlock_fb_info(info);
1194 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1195 break;
1196 case FBIOPUT_CON2FBMAP:
1197 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1198 return -EFAULT;
1199 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1200 return -EINVAL;
1201 if (con2fb.framebuffer >= FB_MAX)
1202 return -EINVAL;
1203 if (!registered_fb[con2fb.framebuffer])
1204 request_module("fb%d", con2fb.framebuffer);
1205 if (!registered_fb[con2fb.framebuffer]) {
1206 ret = -EINVAL;
1207 break;
1208 }
1209 event.data = &con2fb;
1210 console_lock();
1211 if (!lock_fb_info(info)) {
1212 console_unlock();
1213 return -ENODEV;
1214 }
1215 event.info = info;
1216 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1217 unlock_fb_info(info);
1218 console_unlock();
1219 break;
1220 case FBIOBLANK:
1221 console_lock();
1222 if (!lock_fb_info(info)) {
1223 console_unlock();
1224 return -ENODEV;
1225 }
1226 info->flags |= FBINFO_MISC_USEREVENT;
1227 ret = fb_blank(info, arg);
1228 info->flags &= ~FBINFO_MISC_USEREVENT;
1229 unlock_fb_info(info);
1230 console_unlock();
1231 break;
1232 default:
1233 if (!lock_fb_info(info))
1234 return -ENODEV;
1235 fb = info->fbops;
1236 if (fb->fb_ioctl)
1237 ret = fb->fb_ioctl(info, cmd, arg);
1238 else
1239 ret = -ENOTTY;
1240 unlock_fb_info(info);
1241 }
1242 return ret;
1243 }
1244
fb_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1245 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1246 {
1247 struct fb_info *info = file_fb_info(file);
1248
1249 if (!info)
1250 return -ENODEV;
1251 return do_fb_ioctl(info, cmd, arg);
1252 }
1253
1254 #ifdef CONFIG_COMPAT
1255 struct fb_fix_screeninfo32 {
1256 char id[16];
1257 compat_caddr_t smem_start;
1258 u32 smem_len;
1259 u32 type;
1260 u32 type_aux;
1261 u32 visual;
1262 u16 xpanstep;
1263 u16 ypanstep;
1264 u16 ywrapstep;
1265 u32 line_length;
1266 compat_caddr_t mmio_start;
1267 u32 mmio_len;
1268 u32 accel;
1269 u16 reserved[3];
1270 };
1271
1272 struct fb_cmap32 {
1273 u32 start;
1274 u32 len;
1275 compat_caddr_t red;
1276 compat_caddr_t green;
1277 compat_caddr_t blue;
1278 compat_caddr_t transp;
1279 };
1280
fb_getput_cmap(struct fb_info * info,unsigned int cmd,unsigned long arg)1281 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1282 unsigned long arg)
1283 {
1284 struct fb_cmap_user __user *cmap;
1285 struct fb_cmap32 __user *cmap32;
1286 __u32 data;
1287 int err;
1288
1289 cmap = compat_alloc_user_space(sizeof(*cmap));
1290 cmap32 = compat_ptr(arg);
1291
1292 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1293 return -EFAULT;
1294
1295 if (get_user(data, &cmap32->red) ||
1296 put_user(compat_ptr(data), &cmap->red) ||
1297 get_user(data, &cmap32->green) ||
1298 put_user(compat_ptr(data), &cmap->green) ||
1299 get_user(data, &cmap32->blue) ||
1300 put_user(compat_ptr(data), &cmap->blue) ||
1301 get_user(data, &cmap32->transp) ||
1302 put_user(compat_ptr(data), &cmap->transp))
1303 return -EFAULT;
1304
1305 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1306
1307 if (!err) {
1308 if (copy_in_user(&cmap32->start,
1309 &cmap->start,
1310 2 * sizeof(__u32)))
1311 err = -EFAULT;
1312 }
1313 return err;
1314 }
1315
do_fscreeninfo_to_user(struct fb_fix_screeninfo * fix,struct fb_fix_screeninfo32 __user * fix32)1316 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1317 struct fb_fix_screeninfo32 __user *fix32)
1318 {
1319 __u32 data;
1320 int err;
1321
1322 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1323
1324 data = (__u32) (unsigned long) fix->smem_start;
1325 err |= put_user(data, &fix32->smem_start);
1326
1327 err |= put_user(fix->smem_len, &fix32->smem_len);
1328 err |= put_user(fix->type, &fix32->type);
1329 err |= put_user(fix->type_aux, &fix32->type_aux);
1330 err |= put_user(fix->visual, &fix32->visual);
1331 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1332 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1333 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1334 err |= put_user(fix->line_length, &fix32->line_length);
1335
1336 data = (__u32) (unsigned long) fix->mmio_start;
1337 err |= put_user(data, &fix32->mmio_start);
1338
1339 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1340 err |= put_user(fix->accel, &fix32->accel);
1341 err |= copy_to_user(fix32->reserved, fix->reserved,
1342 sizeof(fix->reserved));
1343
1344 if (err)
1345 return -EFAULT;
1346 return 0;
1347 }
1348
fb_get_fscreeninfo(struct fb_info * info,unsigned int cmd,unsigned long arg)1349 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1350 unsigned long arg)
1351 {
1352 mm_segment_t old_fs;
1353 struct fb_fix_screeninfo fix;
1354 struct fb_fix_screeninfo32 __user *fix32;
1355 int err;
1356
1357 fix32 = compat_ptr(arg);
1358
1359 old_fs = get_fs();
1360 set_fs(KERNEL_DS);
1361 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1362 set_fs(old_fs);
1363
1364 if (!err)
1365 err = do_fscreeninfo_to_user(&fix, fix32);
1366
1367 return err;
1368 }
1369
fb_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1370 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1371 unsigned long arg)
1372 {
1373 struct fb_info *info = file_fb_info(file);
1374 struct fb_ops *fb;
1375 long ret = -ENOIOCTLCMD;
1376
1377 if (!info)
1378 return -ENODEV;
1379 fb = info->fbops;
1380 switch(cmd) {
1381 case FBIOGET_VSCREENINFO:
1382 case FBIOPUT_VSCREENINFO:
1383 case FBIOPAN_DISPLAY:
1384 case FBIOGET_CON2FBMAP:
1385 case FBIOPUT_CON2FBMAP:
1386 arg = (unsigned long) compat_ptr(arg);
1387 case FBIOBLANK:
1388 ret = do_fb_ioctl(info, cmd, arg);
1389 break;
1390
1391 case FBIOGET_FSCREENINFO:
1392 ret = fb_get_fscreeninfo(info, cmd, arg);
1393 break;
1394
1395 case FBIOGETCMAP:
1396 case FBIOPUTCMAP:
1397 ret = fb_getput_cmap(info, cmd, arg);
1398 break;
1399
1400 default:
1401 if (fb->fb_compat_ioctl)
1402 ret = fb->fb_compat_ioctl(info, cmd, arg);
1403 break;
1404 }
1405 return ret;
1406 }
1407 #endif
1408
1409 static int
fb_mmap(struct file * file,struct vm_area_struct * vma)1410 fb_mmap(struct file *file, struct vm_area_struct * vma)
1411 {
1412 struct fb_info *info = file_fb_info(file);
1413 struct fb_ops *fb;
1414 unsigned long mmio_pgoff;
1415 unsigned long start;
1416 u32 len;
1417
1418 if (!info)
1419 return -ENODEV;
1420 fb = info->fbops;
1421 if (!fb)
1422 return -ENODEV;
1423 mutex_lock(&info->mm_lock);
1424 if (fb->fb_mmap) {
1425 int res;
1426 res = fb->fb_mmap(info, vma);
1427 mutex_unlock(&info->mm_lock);
1428 return res;
1429 }
1430
1431 /*
1432 * Ugh. This can be either the frame buffer mapping, or
1433 * if pgoff points past it, the mmio mapping.
1434 */
1435 start = info->fix.smem_start;
1436 len = info->fix.smem_len;
1437 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1438 if (vma->vm_pgoff >= mmio_pgoff) {
1439 if (info->var.accel_flags) {
1440 mutex_unlock(&info->mm_lock);
1441 return -EINVAL;
1442 }
1443
1444 vma->vm_pgoff -= mmio_pgoff;
1445 start = info->fix.mmio_start;
1446 len = info->fix.mmio_len;
1447 }
1448 mutex_unlock(&info->mm_lock);
1449
1450 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1451 fb_pgprotect(file, vma, start);
1452
1453 return vm_iomap_memory(vma, start, len);
1454 }
1455
1456 static int
fb_open(struct inode * inode,struct file * file)1457 fb_open(struct inode *inode, struct file *file)
1458 __acquires(&info->lock)
1459 __releases(&info->lock)
1460 {
1461 int fbidx = iminor(inode);
1462 struct fb_info *info;
1463 int res = 0;
1464
1465 info = get_fb_info(fbidx);
1466 if (!info) {
1467 request_module("fb%d", fbidx);
1468 info = get_fb_info(fbidx);
1469 if (!info)
1470 return -ENODEV;
1471 }
1472 if (IS_ERR(info))
1473 return PTR_ERR(info);
1474
1475 mutex_lock(&info->lock);
1476 if (!try_module_get(info->fbops->owner)) {
1477 res = -ENODEV;
1478 goto out;
1479 }
1480 file->private_data = info;
1481 if (info->fbops->fb_open) {
1482 res = info->fbops->fb_open(info,1);
1483 if (res)
1484 module_put(info->fbops->owner);
1485 }
1486 #ifdef CONFIG_FB_DEFERRED_IO
1487 if (info->fbdefio)
1488 fb_deferred_io_open(info, inode, file);
1489 #endif
1490 out:
1491 mutex_unlock(&info->lock);
1492 if (res)
1493 put_fb_info(info);
1494 return res;
1495 }
1496
1497 static int
fb_release(struct inode * inode,struct file * file)1498 fb_release(struct inode *inode, struct file *file)
1499 __acquires(&info->lock)
1500 __releases(&info->lock)
1501 {
1502 struct fb_info * const info = file->private_data;
1503
1504 mutex_lock(&info->lock);
1505 if (info->fbops->fb_release)
1506 info->fbops->fb_release(info,1);
1507 module_put(info->fbops->owner);
1508 mutex_unlock(&info->lock);
1509 put_fb_info(info);
1510 return 0;
1511 }
1512
1513 static const struct file_operations fb_fops = {
1514 .owner = THIS_MODULE,
1515 .read = fb_read,
1516 .write = fb_write,
1517 .unlocked_ioctl = fb_ioctl,
1518 #ifdef CONFIG_COMPAT
1519 .compat_ioctl = fb_compat_ioctl,
1520 #endif
1521 .mmap = fb_mmap,
1522 .open = fb_open,
1523 .release = fb_release,
1524 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1525 .get_unmapped_area = get_fb_unmapped_area,
1526 #endif
1527 #ifdef CONFIG_FB_DEFERRED_IO
1528 .fsync = fb_deferred_io_fsync,
1529 #endif
1530 .llseek = default_llseek,
1531 };
1532
1533 struct class *fb_class;
1534 EXPORT_SYMBOL(fb_class);
1535
fb_check_foreignness(struct fb_info * fi)1536 static int fb_check_foreignness(struct fb_info *fi)
1537 {
1538 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1539
1540 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1541
1542 #ifdef __BIG_ENDIAN
1543 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1544 #else
1545 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1546 #endif /* __BIG_ENDIAN */
1547
1548 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1549 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1550 "support this framebuffer\n", fi->fix.id);
1551 return -ENOSYS;
1552 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1553 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1554 "support this framebuffer\n", fi->fix.id);
1555 return -ENOSYS;
1556 }
1557
1558 return 0;
1559 }
1560
apertures_overlap(struct aperture * gen,struct aperture * hw)1561 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1562 {
1563 /* is the generic aperture base the same as the HW one */
1564 if (gen->base == hw->base)
1565 return true;
1566 /* is the generic aperture base inside the hw base->hw base+size */
1567 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1568 return true;
1569 return false;
1570 }
1571
fb_do_apertures_overlap(struct apertures_struct * gena,struct apertures_struct * hwa)1572 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1573 struct apertures_struct *hwa)
1574 {
1575 int i, j;
1576 if (!hwa || !gena)
1577 return false;
1578
1579 for (i = 0; i < hwa->count; ++i) {
1580 struct aperture *h = &hwa->ranges[i];
1581 for (j = 0; j < gena->count; ++j) {
1582 struct aperture *g = &gena->ranges[j];
1583 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1584 (unsigned long long)g->base,
1585 (unsigned long long)g->size,
1586 (unsigned long long)h->base,
1587 (unsigned long long)h->size);
1588 if (apertures_overlap(g, h))
1589 return true;
1590 }
1591 }
1592
1593 return false;
1594 }
1595
1596 static int do_unregister_framebuffer(struct fb_info *fb_info);
1597
1598 #define VGA_FB_PHYS 0xA0000
do_remove_conflicting_framebuffers(struct apertures_struct * a,const char * name,bool primary)1599 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1600 const char *name, bool primary)
1601 {
1602 int i, ret;
1603
1604 /* check all firmware fbs and kick off if the base addr overlaps */
1605 for (i = 0 ; i < FB_MAX; i++) {
1606 struct apertures_struct *gen_aper;
1607 if (!registered_fb[i])
1608 continue;
1609
1610 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1611 continue;
1612
1613 gen_aper = registered_fb[i]->apertures;
1614 if (fb_do_apertures_overlap(gen_aper, a) ||
1615 (primary && gen_aper && gen_aper->count &&
1616 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1617
1618 printk(KERN_INFO "fb: switching to %s from %s\n",
1619 name, registered_fb[i]->fix.id);
1620 ret = do_unregister_framebuffer(registered_fb[i]);
1621 if (ret)
1622 return ret;
1623 }
1624 }
1625
1626 return 0;
1627 }
1628
do_register_framebuffer(struct fb_info * fb_info)1629 static int do_register_framebuffer(struct fb_info *fb_info)
1630 {
1631 int i, ret;
1632 struct fb_event event;
1633 struct fb_videomode mode;
1634
1635 if (fb_check_foreignness(fb_info))
1636 return -ENOSYS;
1637
1638 ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1639 fb_info->fix.id,
1640 fb_is_primary_device(fb_info));
1641 if (ret)
1642 return ret;
1643
1644 if (num_registered_fb == FB_MAX)
1645 return -ENXIO;
1646
1647 num_registered_fb++;
1648 for (i = 0 ; i < FB_MAX; i++)
1649 if (!registered_fb[i])
1650 break;
1651 fb_info->node = i;
1652 atomic_set(&fb_info->count, 1);
1653 mutex_init(&fb_info->lock);
1654 mutex_init(&fb_info->mm_lock);
1655
1656 fb_info->dev = device_create(fb_class, fb_info->device,
1657 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1658 if (IS_ERR(fb_info->dev)) {
1659 /* Not fatal */
1660 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1661 fb_info->dev = NULL;
1662 } else
1663 fb_init_device(fb_info);
1664
1665 if (fb_info->pixmap.addr == NULL) {
1666 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1667 if (fb_info->pixmap.addr) {
1668 fb_info->pixmap.size = FBPIXMAPSIZE;
1669 fb_info->pixmap.buf_align = 1;
1670 fb_info->pixmap.scan_align = 1;
1671 fb_info->pixmap.access_align = 32;
1672 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1673 }
1674 }
1675 fb_info->pixmap.offset = 0;
1676
1677 if (!fb_info->pixmap.blit_x)
1678 fb_info->pixmap.blit_x = ~(u32)0;
1679
1680 if (!fb_info->pixmap.blit_y)
1681 fb_info->pixmap.blit_y = ~(u32)0;
1682
1683 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1684 INIT_LIST_HEAD(&fb_info->modelist);
1685
1686 if (fb_info->skip_vt_switch)
1687 pm_vt_switch_required(fb_info->dev, false);
1688 else
1689 pm_vt_switch_required(fb_info->dev, true);
1690
1691 fb_var_to_videomode(&mode, &fb_info->var);
1692 fb_add_videomode(&mode, &fb_info->modelist);
1693 registered_fb[i] = fb_info;
1694
1695 event.info = fb_info;
1696 console_lock();
1697 if (!lock_fb_info(fb_info)) {
1698 console_unlock();
1699 return -ENODEV;
1700 }
1701
1702 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1703 unlock_fb_info(fb_info);
1704 console_unlock();
1705 return 0;
1706 }
1707
unbind_console(struct fb_info * fb_info)1708 static int unbind_console(struct fb_info *fb_info)
1709 {
1710 struct fb_event event;
1711 int ret;
1712 int i = fb_info->node;
1713
1714 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1715 return -EINVAL;
1716
1717 console_lock();
1718 if (!lock_fb_info(fb_info)) {
1719 console_unlock();
1720 return -ENODEV;
1721 }
1722
1723 event.info = fb_info;
1724 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1725 unlock_fb_info(fb_info);
1726 console_unlock();
1727
1728 return ret;
1729 }
1730
1731 static int __unlink_framebuffer(struct fb_info *fb_info);
1732
do_unregister_framebuffer(struct fb_info * fb_info)1733 static int do_unregister_framebuffer(struct fb_info *fb_info)
1734 {
1735 struct fb_event event;
1736 int ret;
1737
1738 ret = unbind_console(fb_info);
1739
1740 if (ret)
1741 return -EINVAL;
1742
1743 pm_vt_switch_unregister(fb_info->dev);
1744
1745 __unlink_framebuffer(fb_info);
1746 if (fb_info->pixmap.addr &&
1747 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1748 kfree(fb_info->pixmap.addr);
1749 fb_destroy_modelist(&fb_info->modelist);
1750 registered_fb[fb_info->node] = NULL;
1751 num_registered_fb--;
1752 fb_cleanup_device(fb_info);
1753 event.info = fb_info;
1754 console_lock();
1755 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1756 console_unlock();
1757
1758 /* this may free fb info */
1759 put_fb_info(fb_info);
1760 return 0;
1761 }
1762
__unlink_framebuffer(struct fb_info * fb_info)1763 static int __unlink_framebuffer(struct fb_info *fb_info)
1764 {
1765 int i;
1766
1767 i = fb_info->node;
1768 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1769 return -EINVAL;
1770
1771 if (fb_info->dev) {
1772 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1773 fb_info->dev = NULL;
1774 }
1775
1776 return 0;
1777 }
1778
unlink_framebuffer(struct fb_info * fb_info)1779 int unlink_framebuffer(struct fb_info *fb_info)
1780 {
1781 int ret;
1782
1783 ret = __unlink_framebuffer(fb_info);
1784 if (ret)
1785 return ret;
1786
1787 unbind_console(fb_info);
1788
1789 return 0;
1790 }
1791 EXPORT_SYMBOL(unlink_framebuffer);
1792
remove_conflicting_framebuffers(struct apertures_struct * a,const char * name,bool primary)1793 int remove_conflicting_framebuffers(struct apertures_struct *a,
1794 const char *name, bool primary)
1795 {
1796 int ret;
1797
1798 mutex_lock(®istration_lock);
1799 ret = do_remove_conflicting_framebuffers(a, name, primary);
1800 mutex_unlock(®istration_lock);
1801
1802 return ret;
1803 }
1804 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1805
1806 /**
1807 * register_framebuffer - registers a frame buffer device
1808 * @fb_info: frame buffer info structure
1809 *
1810 * Registers a frame buffer device @fb_info.
1811 *
1812 * Returns negative errno on error, or zero for success.
1813 *
1814 */
1815 int
register_framebuffer(struct fb_info * fb_info)1816 register_framebuffer(struct fb_info *fb_info)
1817 {
1818 int ret;
1819
1820 mutex_lock(®istration_lock);
1821 ret = do_register_framebuffer(fb_info);
1822 mutex_unlock(®istration_lock);
1823
1824 return ret;
1825 }
1826 EXPORT_SYMBOL(register_framebuffer);
1827
1828 /**
1829 * unregister_framebuffer - releases a frame buffer device
1830 * @fb_info: frame buffer info structure
1831 *
1832 * Unregisters a frame buffer device @fb_info.
1833 *
1834 * Returns negative errno on error, or zero for success.
1835 *
1836 * This function will also notify the framebuffer console
1837 * to release the driver.
1838 *
1839 * This is meant to be called within a driver's module_exit()
1840 * function. If this is called outside module_exit(), ensure
1841 * that the driver implements fb_open() and fb_release() to
1842 * check that no processes are using the device.
1843 */
1844 int
unregister_framebuffer(struct fb_info * fb_info)1845 unregister_framebuffer(struct fb_info *fb_info)
1846 {
1847 int ret;
1848
1849 mutex_lock(®istration_lock);
1850 ret = do_unregister_framebuffer(fb_info);
1851 mutex_unlock(®istration_lock);
1852
1853 return ret;
1854 }
1855 EXPORT_SYMBOL(unregister_framebuffer);
1856
1857 /**
1858 * fb_set_suspend - low level driver signals suspend
1859 * @info: framebuffer affected
1860 * @state: 0 = resuming, !=0 = suspending
1861 *
1862 * This is meant to be used by low level drivers to
1863 * signal suspend/resume to the core & clients.
1864 * It must be called with the console semaphore held
1865 */
fb_set_suspend(struct fb_info * info,int state)1866 void fb_set_suspend(struct fb_info *info, int state)
1867 {
1868 struct fb_event event;
1869
1870 event.info = info;
1871 if (state) {
1872 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1873 info->state = FBINFO_STATE_SUSPENDED;
1874 } else {
1875 info->state = FBINFO_STATE_RUNNING;
1876 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1877 }
1878 }
1879 EXPORT_SYMBOL(fb_set_suspend);
1880
1881 /**
1882 * fbmem_init - init frame buffer subsystem
1883 *
1884 * Initialize the frame buffer subsystem.
1885 *
1886 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1887 *
1888 */
1889
1890 static int __init
fbmem_init(void)1891 fbmem_init(void)
1892 {
1893 proc_create("fb", 0, NULL, &fb_proc_fops);
1894
1895 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1896 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1897
1898 fb_class = class_create(THIS_MODULE, "graphics");
1899 if (IS_ERR(fb_class)) {
1900 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1901 fb_class = NULL;
1902 }
1903 return 0;
1904 }
1905
1906 #ifdef MODULE
1907 module_init(fbmem_init);
1908 static void __exit
fbmem_exit(void)1909 fbmem_exit(void)
1910 {
1911 remove_proc_entry("fb", NULL);
1912 class_destroy(fb_class);
1913 unregister_chrdev(FB_MAJOR, "fb");
1914 }
1915
1916 module_exit(fbmem_exit);
1917 MODULE_LICENSE("GPL");
1918 MODULE_DESCRIPTION("Framebuffer base");
1919 #else
1920 subsys_initcall(fbmem_init);
1921 #endif
1922
fb_new_modelist(struct fb_info * info)1923 int fb_new_modelist(struct fb_info *info)
1924 {
1925 struct fb_event event;
1926 struct fb_var_screeninfo var = info->var;
1927 struct list_head *pos, *n;
1928 struct fb_modelist *modelist;
1929 struct fb_videomode *m, mode;
1930 int err = 1;
1931
1932 list_for_each_safe(pos, n, &info->modelist) {
1933 modelist = list_entry(pos, struct fb_modelist, list);
1934 m = &modelist->mode;
1935 fb_videomode_to_var(&var, m);
1936 var.activate = FB_ACTIVATE_TEST;
1937 err = fb_set_var(info, &var);
1938 fb_var_to_videomode(&mode, &var);
1939 if (err || !fb_mode_is_equal(m, &mode)) {
1940 list_del(pos);
1941 kfree(pos);
1942 }
1943 }
1944
1945 err = 1;
1946
1947 if (!list_empty(&info->modelist)) {
1948 event.info = info;
1949 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1950 }
1951
1952 return err;
1953 }
1954
1955 MODULE_LICENSE("GPL");
1956