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Linux 4.19.133
[linux/fpc-iii.git] / drivers / video / fbdev / core / fbmem.c
blob84845275dbef02a3ec8e6e52d587f2a378790153
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/fbcon.h>
36 #include <linux/mem_encrypt.h>
37
38 #include <asm/fb.h>
39
40
41 /*
42 * Frame buffer device initialization and setup routines
43 */
44
45 #define FBPIXMAPSIZE (1024 * 8)
46
47 static DEFINE_MUTEX(registration_lock);
48
49 struct fb_info *registered_fb[FB_MAX] __read_mostly;
50 EXPORT_SYMBOL(registered_fb);
51
52 int num_registered_fb __read_mostly;
53 EXPORT_SYMBOL(num_registered_fb);
54
55 static struct fb_info *get_fb_info(unsigned int idx)
56 {
57 struct fb_info *fb_info;
58
59 if (idx >= FB_MAX)
60 return ERR_PTR(-ENODEV);
61
62 mutex_lock(&registration_lock);
63 fb_info = registered_fb[idx];
64 if (fb_info)
65 atomic_inc(&fb_info->count);
66 mutex_unlock(&registration_lock);
67
68 return fb_info;
69 }
70
71 static void put_fb_info(struct fb_info *fb_info)
72 {
73 if (!atomic_dec_and_test(&fb_info->count))
74 return;
75 if (fb_info->fbops->fb_destroy)
76 fb_info->fbops->fb_destroy(fb_info);
77 }
78
79 int lock_fb_info(struct fb_info *info)
80 {
81 mutex_lock(&info->lock);
82 if (!info->fbops) {
83 mutex_unlock(&info->lock);
84 return 0;
85 }
86 return 1;
87 }
88 EXPORT_SYMBOL(lock_fb_info);
89
90 /*
91 * Helpers
92 */
93
94 int fb_get_color_depth(struct fb_var_screeninfo *var,
95 struct fb_fix_screeninfo *fix)
96 {
97 int depth = 0;
98
99 if (fix->visual == FB_VISUAL_MONO01 ||
100 fix->visual == FB_VISUAL_MONO10)
101 depth = 1;
102 else {
103 if (var->green.length == var->blue.length &&
104 var->green.length == var->red.length &&
105 var->green.offset == var->blue.offset &&
106 var->green.offset == var->red.offset)
107 depth = var->green.length;
108 else
109 depth = var->green.length + var->red.length +
110 var->blue.length;
111 }
112
113 return depth;
114 }
115 EXPORT_SYMBOL(fb_get_color_depth);
116
117 /*
118 * Data padding functions.
119 */
120 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
121 {
122 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
123 }
124 EXPORT_SYMBOL(fb_pad_aligned_buffer);
125
126 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
127 u32 shift_high, u32 shift_low, u32 mod)
128 {
129 u8 mask = (u8) (0xfff << shift_high), tmp;
130 int i, j;
131
132 for (i = height; i--; ) {
133 for (j = 0; j < idx; j++) {
134 tmp = dst[j];
135 tmp &= mask;
136 tmp |= *src >> shift_low;
137 dst[j] = tmp;
138 tmp = *src << shift_high;
139 dst[j+1] = tmp;
140 src++;
141 }
142 tmp = dst[idx];
143 tmp &= mask;
144 tmp |= *src >> shift_low;
145 dst[idx] = tmp;
146 if (shift_high < mod) {
147 tmp = *src << shift_high;
148 dst[idx+1] = tmp;
149 }
150 src++;
151 dst += d_pitch;
152 }
153 }
154 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
155
156 /*
157 * we need to lock this section since fb_cursor
158 * may use fb_imageblit()
159 */
160 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
161 {
162 u32 align = buf->buf_align - 1, offset;
163 char *addr = buf->addr;
164
165 /* If IO mapped, we need to sync before access, no sharing of
166 * the pixmap is done
167 */
168 if (buf->flags & FB_PIXMAP_IO) {
169 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
170 info->fbops->fb_sync(info);
171 return addr;
172 }
173
174 /* See if we fit in the remaining pixmap space */
175 offset = buf->offset + align;
176 offset &= ~align;
177 if (offset + size > buf->size) {
178 /* We do not fit. In order to be able to re-use the buffer,
179 * we must ensure no asynchronous DMA'ing or whatever operation
180 * is in progress, we sync for that.
181 */
182 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
183 info->fbops->fb_sync(info);
184 offset = 0;
185 }
186 buf->offset = offset + size;
187 addr += offset;
188
189 return addr;
190 }
191 EXPORT_SYMBOL(fb_get_buffer_offset);
192
193 #ifdef CONFIG_LOGO
194
195 static inline unsigned safe_shift(unsigned d, int n)
196 {
197 return n < 0 ? d >> -n : d << n;
198 }
199
200 static void fb_set_logocmap(struct fb_info *info,
201 const struct linux_logo *logo)
202 {
203 struct fb_cmap palette_cmap;
204 u16 palette_green[16];
205 u16 palette_blue[16];
206 u16 palette_red[16];
207 int i, j, n;
208 const unsigned char *clut = logo->clut;
209
210 palette_cmap.start = 0;
211 palette_cmap.len = 16;
212 palette_cmap.red = palette_red;
213 palette_cmap.green = palette_green;
214 palette_cmap.blue = palette_blue;
215 palette_cmap.transp = NULL;
216
217 for (i = 0; i < logo->clutsize; i += n) {
218 n = logo->clutsize - i;
219 /* palette_cmap provides space for only 16 colors at once */
220 if (n > 16)
221 n = 16;
222 palette_cmap.start = 32 + i;
223 palette_cmap.len = n;
224 for (j = 0; j < n; ++j) {
225 palette_cmap.red[j] = clut[0] << 8 | clut[0];
226 palette_cmap.green[j] = clut[1] << 8 | clut[1];
227 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
228 clut += 3;
229 }
230 fb_set_cmap(&palette_cmap, info);
231 }
232 }
233
234 static void fb_set_logo_truepalette(struct fb_info *info,
235 const struct linux_logo *logo,
236 u32 *palette)
237 {
238 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
239 unsigned char redmask, greenmask, bluemask;
240 int redshift, greenshift, blueshift;
241 int i;
242 const unsigned char *clut = logo->clut;
243
244 /*
245 * We have to create a temporary palette since console palette is only
246 * 16 colors long.
247 */
248 /* Bug: Doesn't obey msb_right ... (who needs that?) */
249 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
250 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
251 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
252 redshift = info->var.red.offset - (8 - info->var.red.length);
253 greenshift = info->var.green.offset - (8 - info->var.green.length);
254 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
255
256 for ( i = 0; i < logo->clutsize; i++) {
257 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
258 safe_shift((clut[1] & greenmask), greenshift) |
259 safe_shift((clut[2] & bluemask), blueshift));
260 clut += 3;
261 }
262 }
263
264 static void fb_set_logo_directpalette(struct fb_info *info,
265 const struct linux_logo *logo,
266 u32 *palette)
267 {
268 int redshift, greenshift, blueshift;
269 int i;
270
271 redshift = info->var.red.offset;
272 greenshift = info->var.green.offset;
273 blueshift = info->var.blue.offset;
274
275 for (i = 32; i < 32 + logo->clutsize; i++)
276 palette[i] = i << redshift | i << greenshift | i << blueshift;
277 }
278
279 static void fb_set_logo(struct fb_info *info,
280 const struct linux_logo *logo, u8 *dst,
281 int depth)
282 {
283 int i, j, k;
284 const u8 *src = logo->data;
285 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
286 u8 fg = 1, d;
287
288 switch (fb_get_color_depth(&info->var, &info->fix)) {
289 case 1:
290 fg = 1;
291 break;
292 case 2:
293 fg = 3;
294 break;
295 default:
296 fg = 7;
297 break;
298 }
299
300 if (info->fix.visual == FB_VISUAL_MONO01 ||
301 info->fix.visual == FB_VISUAL_MONO10)
302 fg = ~((u8) (0xfff << info->var.green.length));
303
304 switch (depth) {
305 case 4:
306 for (i = 0; i < logo->height; i++)
307 for (j = 0; j < logo->width; src++) {
308 *dst++ = *src >> 4;
309 j++;
310 if (j < logo->width) {
311 *dst++ = *src & 0x0f;
312 j++;
313 }
314 }
315 break;
316 case 1:
317 for (i = 0; i < logo->height; i++) {
318 for (j = 0; j < logo->width; src++) {
319 d = *src ^ xor;
320 for (k = 7; k >= 0 && j < logo->width; k--) {
321 *dst++ = ((d >> k) & 1) ? fg : 0;
322 j++;
323 }
324 }
325 }
326 break;
327 }
328 }
329
330 /*
331 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
332 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
333 * the visual format and color depth of the framebuffer, the DAC, the
334 * pseudo_palette, and the logo data will be adjusted accordingly.
335 *
336 * Case 1 - linux_logo_clut224:
337 * Color exceeds the number of console colors (16), thus we set the hardware DAC
338 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
339 *
340 * For visuals that require color info from the pseudo_palette, we also construct
341 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
342 * will be set.
343 *
344 * Case 2 - linux_logo_vga16:
345 * The number of colors just matches the console colors, thus there is no need
346 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
347 * each byte contains color information for two pixels (upper and lower nibble).
348 * To be consistent with fb_imageblit() usage, we therefore separate the two
349 * nibbles into separate bytes. The "depth" flag will be set to 4.
350 *
351 * Case 3 - linux_logo_mono:
352 * This is similar with Case 2. Each byte contains information for 8 pixels.
353 * We isolate each bit and expand each into a byte. The "depth" flag will
354 * be set to 1.
355 */
356 static struct logo_data {
357 int depth;
358 int needs_directpalette;
359 int needs_truepalette;
360 int needs_cmapreset;
361 const struct linux_logo *logo;
362 } fb_logo __read_mostly;
363
364 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
365 {
366 u32 size = width * height, i;
367
368 out += size - 1;
369
370 for (i = size; i--; )
371 *out-- = *in++;
372 }
373
374 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
375 {
376 int i, j, h = height - 1;
377
378 for (i = 0; i < height; i++)
379 for (j = 0; j < width; j++)
380 out[height * j + h - i] = *in++;
381 }
382
383 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
384 {
385 int i, j, w = width - 1;
386
387 for (i = 0; i < height; i++)
388 for (j = 0; j < width; j++)
389 out[height * (w - j) + i] = *in++;
390 }
391
392 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
393 struct fb_image *image, int rotate)
394 {
395 u32 tmp;
396
397 if (rotate == FB_ROTATE_UD) {
398 fb_rotate_logo_ud(image->data, dst, image->width,
399 image->height);
400 image->dx = info->var.xres - image->width - image->dx;
401 image->dy = info->var.yres - image->height - image->dy;
402 } else if (rotate == FB_ROTATE_CW) {
403 fb_rotate_logo_cw(image->data, dst, image->width,
404 image->height);
405 tmp = image->width;
406 image->width = image->height;
407 image->height = tmp;
408 tmp = image->dy;
409 image->dy = image->dx;
410 image->dx = info->var.xres - image->width - tmp;
411 } else if (rotate == FB_ROTATE_CCW) {
412 fb_rotate_logo_ccw(image->data, dst, image->width,
413 image->height);
414 tmp = image->width;
415 image->width = image->height;
416 image->height = tmp;
417 tmp = image->dx;
418 image->dx = image->dy;
419 image->dy = info->var.yres - image->height - tmp;
420 }
421
422 image->data = dst;
423 }
424
425 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
426 int rotate, unsigned int num)
427 {
428 unsigned int x;
429
430 if (image->width > info->var.xres || image->height > info->var.yres)
431 return;
432
433 if (rotate == FB_ROTATE_UR) {
434 for (x = 0;
435 x < num && image->dx + image->width <= info->var.xres;
436 x++) {
437 info->fbops->fb_imageblit(info, image);
438 image->dx += image->width + 8;
439 }
440 } else if (rotate == FB_ROTATE_UD) {
441 u32 dx = image->dx;
442
443 for (x = 0; x < num && image->dx <= dx; x++) {
444 info->fbops->fb_imageblit(info, image);
445 image->dx -= image->width + 8;
446 }
447 } else if (rotate == FB_ROTATE_CW) {
448 for (x = 0;
449 x < num && image->dy + image->height <= info->var.yres;
450 x++) {
451 info->fbops->fb_imageblit(info, image);
452 image->dy += image->height + 8;
453 }
454 } else if (rotate == FB_ROTATE_CCW) {
455 u32 dy = image->dy;
456
457 for (x = 0; x < num && image->dy <= dy; x++) {
458 info->fbops->fb_imageblit(info, image);
459 image->dy -= image->height + 8;
460 }
461 }
462 }
463
464 static int fb_show_logo_line(struct fb_info *info, int rotate,
465 const struct linux_logo *logo, int y,
466 unsigned int n)
467 {
468 u32 *palette = NULL, *saved_pseudo_palette = NULL;
469 unsigned char *logo_new = NULL, *logo_rotate = NULL;
470 struct fb_image image;
471
472 /* Return if the frame buffer is not mapped or suspended */
473 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
474 info->fbops->owner)
475 return 0;
476
477 image.depth = 8;
478 image.data = logo->data;
479
480 if (fb_logo.needs_cmapreset)
481 fb_set_logocmap(info, logo);
482
483 if (fb_logo.needs_truepalette ||
484 fb_logo.needs_directpalette) {
485 palette = kmalloc(256 * 4, GFP_KERNEL);
486 if (palette == NULL)
487 return 0;
488
489 if (fb_logo.needs_truepalette)
490 fb_set_logo_truepalette(info, logo, palette);
491 else
492 fb_set_logo_directpalette(info, logo, palette);
493
494 saved_pseudo_palette = info->pseudo_palette;
495 info->pseudo_palette = palette;
496 }
497
498 if (fb_logo.depth <= 4) {
499 logo_new = kmalloc_array(logo->width, logo->height,
500 GFP_KERNEL);
501 if (logo_new == NULL) {
502 kfree(palette);
503 if (saved_pseudo_palette)
504 info->pseudo_palette = saved_pseudo_palette;
505 return 0;
506 }
507 image.data = logo_new;
508 fb_set_logo(info, logo, logo_new, fb_logo.depth);
509 }
510
511 image.dx = 0;
512 image.dy = y;
513 image.width = logo->width;
514 image.height = logo->height;
515
516 if (rotate) {
517 logo_rotate = kmalloc_array(logo->width, logo->height,
518 GFP_KERNEL);
519 if (logo_rotate)
520 fb_rotate_logo(info, logo_rotate, &image, rotate);
521 }
522
523 fb_do_show_logo(info, &image, rotate, n);
524
525 kfree(palette);
526 if (saved_pseudo_palette != NULL)
527 info->pseudo_palette = saved_pseudo_palette;
528 kfree(logo_new);
529 kfree(logo_rotate);
530 return logo->height;
531 }
532
533
534 #ifdef CONFIG_FB_LOGO_EXTRA
535
536 #define FB_LOGO_EX_NUM_MAX 10
537 static struct logo_data_extra {
538 const struct linux_logo *logo;
539 unsigned int n;
540 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
541 static unsigned int fb_logo_ex_num;
542
543 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
544 {
545 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
546 return;
547
548 fb_logo_ex[fb_logo_ex_num].logo = logo;
549 fb_logo_ex[fb_logo_ex_num].n = n;
550 fb_logo_ex_num++;
551 }
552
553 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
554 unsigned int yres)
555 {
556 unsigned int i;
557
558 /* FIXME: logo_ex supports only truecolor fb. */
559 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
560 fb_logo_ex_num = 0;
561
562 for (i = 0; i < fb_logo_ex_num; i++) {
563 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
564 fb_logo_ex[i].logo = NULL;
565 continue;
566 }
567 height += fb_logo_ex[i].logo->height;
568 if (height > yres) {
569 height -= fb_logo_ex[i].logo->height;
570 fb_logo_ex_num = i;
571 break;
572 }
573 }
574 return height;
575 }
576
577 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
578 {
579 unsigned int i;
580
581 for (i = 0; i < fb_logo_ex_num; i++)
582 y += fb_show_logo_line(info, rotate,
583 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
584
585 return y;
586 }
587
588 #else /* !CONFIG_FB_LOGO_EXTRA */
589
590 static inline int fb_prepare_extra_logos(struct fb_info *info,
591 unsigned int height,
592 unsigned int yres)
593 {
594 return height;
595 }
596
597 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
598 {
599 return y;
600 }
601
602 #endif /* CONFIG_FB_LOGO_EXTRA */
603
604
605 int fb_prepare_logo(struct fb_info *info, int rotate)
606 {
607 int depth = fb_get_color_depth(&info->var, &info->fix);
608 unsigned int yres;
609
610 memset(&fb_logo, 0, sizeof(struct logo_data));
611
612 if (info->flags & FBINFO_MISC_TILEBLITTING ||
613 info->fbops->owner)
614 return 0;
615
616 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
617 depth = info->var.blue.length;
618 if (info->var.red.length < depth)
619 depth = info->var.red.length;
620 if (info->var.green.length < depth)
621 depth = info->var.green.length;
622 }
623
624 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
625 /* assume console colormap */
626 depth = 4;
627 }
628
629 /* Return if no suitable logo was found */
630 fb_logo.logo = fb_find_logo(depth);
631
632 if (!fb_logo.logo) {
633 return 0;
634 }
635
636 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
637 yres = info->var.yres;
638 else
639 yres = info->var.xres;
640
641 if (fb_logo.logo->height > yres) {
642 fb_logo.logo = NULL;
643 return 0;
644 }
645
646 /* What depth we asked for might be different from what we get */
647 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
648 fb_logo.depth = 8;
649 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
650 fb_logo.depth = 4;
651 else
652 fb_logo.depth = 1;
653
654
655 if (fb_logo.depth > 4 && depth > 4) {
656 switch (info->fix.visual) {
657 case FB_VISUAL_TRUECOLOR:
658 fb_logo.needs_truepalette = 1;
659 break;
660 case FB_VISUAL_DIRECTCOLOR:
661 fb_logo.needs_directpalette = 1;
662 fb_logo.needs_cmapreset = 1;
663 break;
664 case FB_VISUAL_PSEUDOCOLOR:
665 fb_logo.needs_cmapreset = 1;
666 break;
667 }
668 }
669
670 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
671 }
672
673 int fb_show_logo(struct fb_info *info, int rotate)
674 {
675 int y;
676
677 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
678 num_online_cpus());
679 y = fb_show_extra_logos(info, y, rotate);
680
681 return y;
682 }
683 #else
684 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
685 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
686 #endif /* CONFIG_LOGO */
687 EXPORT_SYMBOL(fb_prepare_logo);
688 EXPORT_SYMBOL(fb_show_logo);
689
690 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
691 {
692 mutex_lock(&registration_lock);
693 return (*pos < FB_MAX) ? pos : NULL;
694 }
695
696 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
697 {
698 (*pos)++;
699 return (*pos < FB_MAX) ? pos : NULL;
700 }
701
702 static void fb_seq_stop(struct seq_file *m, void *v)
703 {
704 mutex_unlock(&registration_lock);
705 }
706
707 static int fb_seq_show(struct seq_file *m, void *v)
708 {
709 int i = *(loff_t *)v;
710 struct fb_info *fi = registered_fb[i];
711
712 if (fi)
713 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
714 return 0;
715 }
716
717 static const struct seq_operations proc_fb_seq_ops = {
718 .start = fb_seq_start,
719 .next = fb_seq_next,
720 .stop = fb_seq_stop,
721 .show = fb_seq_show,
722 };
723
724 /*
725 * We hold a reference to the fb_info in file->private_data,
726 * but if the current registered fb has changed, we don't
727 * actually want to use it.
728 *
729 * So look up the fb_info using the inode minor number,
730 * and just verify it against the reference we have.
731 */
732 static struct fb_info *file_fb_info(struct file *file)
733 {
734 struct inode *inode = file_inode(file);
735 int fbidx = iminor(inode);
736 struct fb_info *info = registered_fb[fbidx];
737
738 if (info != file->private_data)
739 info = NULL;
740 return info;
741 }
742
743 static ssize_t
744 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
745 {
746 unsigned long p = *ppos;
747 struct fb_info *info = file_fb_info(file);
748 u8 *buffer, *dst;
749 u8 __iomem *src;
750 int c, cnt = 0, err = 0;
751 unsigned long total_size;
752
753 if (!info || ! info->screen_base)
754 return -ENODEV;
755
756 if (info->state != FBINFO_STATE_RUNNING)
757 return -EPERM;
758
759 if (info->fbops->fb_read)
760 return info->fbops->fb_read(info, buf, count, ppos);
761
762 total_size = info->screen_size;
763
764 if (total_size == 0)
765 total_size = info->fix.smem_len;
766
767 if (p >= total_size)
768 return 0;
769
770 if (count >= total_size)
771 count = total_size;
772
773 if (count + p > total_size)
774 count = total_size - p;
775
776 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
777 GFP_KERNEL);
778 if (!buffer)
779 return -ENOMEM;
780
781 src = (u8 __iomem *) (info->screen_base + p);
782
783 if (info->fbops->fb_sync)
784 info->fbops->fb_sync(info);
785
786 while (count) {
787 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
788 dst = buffer;
789 fb_memcpy_fromfb(dst, src, c);
790 dst += c;
791 src += c;
792
793 if (copy_to_user(buf, buffer, c)) {
794 err = -EFAULT;
795 break;
796 }
797 *ppos += c;
798 buf += c;
799 cnt += c;
800 count -= c;
801 }
802
803 kfree(buffer);
804
805 return (err) ? err : cnt;
806 }
807
808 static ssize_t
809 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
810 {
811 unsigned long p = *ppos;
812 struct fb_info *info = file_fb_info(file);
813 u8 *buffer, *src;
814 u8 __iomem *dst;
815 int c, cnt = 0, err = 0;
816 unsigned long total_size;
817
818 if (!info || !info->screen_base)
819 return -ENODEV;
820
821 if (info->state != FBINFO_STATE_RUNNING)
822 return -EPERM;
823
824 if (info->fbops->fb_write)
825 return info->fbops->fb_write(info, buf, count, ppos);
826
827 total_size = info->screen_size;
828
829 if (total_size == 0)
830 total_size = info->fix.smem_len;
831
832 if (p > total_size)
833 return -EFBIG;
834
835 if (count > total_size) {
836 err = -EFBIG;
837 count = total_size;
838 }
839
840 if (count + p > total_size) {
841 if (!err)
842 err = -ENOSPC;
843
844 count = total_size - p;
845 }
846
847 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
848 GFP_KERNEL);
849 if (!buffer)
850 return -ENOMEM;
851
852 dst = (u8 __iomem *) (info->screen_base + p);
853
854 if (info->fbops->fb_sync)
855 info->fbops->fb_sync(info);
856
857 while (count) {
858 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
859 src = buffer;
860
861 if (copy_from_user(src, buf, c)) {
862 err = -EFAULT;
863 break;
864 }
865
866 fb_memcpy_tofb(dst, src, c);
867 dst += c;
868 src += c;
869 *ppos += c;
870 buf += c;
871 cnt += c;
872 count -= c;
873 }
874
875 kfree(buffer);
876
877 return (cnt) ? cnt : err;
878 }
879
880 int
881 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
882 {
883 struct fb_fix_screeninfo *fix = &info->fix;
884 unsigned int yres = info->var.yres;
885 int err = 0;
886
887 if (var->yoffset > 0) {
888 if (var->vmode & FB_VMODE_YWRAP) {
889 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
890 err = -EINVAL;
891 else
892 yres = 0;
893 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
894 err = -EINVAL;
895 }
896
897 if (var->xoffset > 0 && (!fix->xpanstep ||
898 (var->xoffset % fix->xpanstep)))
899 err = -EINVAL;
900
901 if (err || !info->fbops->fb_pan_display ||
902 var->yoffset > info->var.yres_virtual - yres ||
903 var->xoffset > info->var.xres_virtual - info->var.xres)
904 return -EINVAL;
905
906 if ((err = info->fbops->fb_pan_display(var, info)))
907 return err;
908 info->var.xoffset = var->xoffset;
909 info->var.yoffset = var->yoffset;
910 if (var->vmode & FB_VMODE_YWRAP)
911 info->var.vmode |= FB_VMODE_YWRAP;
912 else
913 info->var.vmode &= ~FB_VMODE_YWRAP;
914 return 0;
915 }
916 EXPORT_SYMBOL(fb_pan_display);
917
918 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
919 u32 activate)
920 {
921 struct fb_event event;
922 struct fb_blit_caps caps, fbcaps;
923 int err = 0;
924
925 memset(&caps, 0, sizeof(caps));
926 memset(&fbcaps, 0, sizeof(fbcaps));
927 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
928 event.info = info;
929 event.data = &caps;
930 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
931 info->fbops->fb_get_caps(info, &fbcaps, var);
932
933 if (((fbcaps.x ^ caps.x) & caps.x) ||
934 ((fbcaps.y ^ caps.y) & caps.y) ||
935 (fbcaps.len < caps.len))
936 err = -EINVAL;
937
938 return err;
939 }
940
941 int
942 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
943 {
944 int flags = info->flags;
945 int ret = 0;
946
947 if (var->activate & FB_ACTIVATE_INV_MODE) {
948 struct fb_videomode mode1, mode2;
949
950 fb_var_to_videomode(&mode1, var);
951 fb_var_to_videomode(&mode2, &info->var);
952 /* make sure we don't delete the videomode of current var */
953 ret = fb_mode_is_equal(&mode1, &mode2);
954
955 if (!ret) {
956 struct fb_event event;
957
958 event.info = info;
959 event.data = &mode1;
960 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
961 }
962
963 if (!ret)
964 fb_delete_videomode(&mode1, &info->modelist);
965
966
967 ret = (ret) ? -EINVAL : 0;
968 goto done;
969 }
970
971 if ((var->activate & FB_ACTIVATE_FORCE) ||
972 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
973 u32 activate = var->activate;
974
975 /* When using FOURCC mode, make sure the red, green, blue and
976 * transp fields are set to 0.
977 */
978 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
979 var->grayscale > 1) {
980 if (var->red.offset || var->green.offset ||
981 var->blue.offset || var->transp.offset ||
982 var->red.length || var->green.length ||
983 var->blue.length || var->transp.length ||
984 var->red.msb_right || var->green.msb_right ||
985 var->blue.msb_right || var->transp.msb_right)
986 return -EINVAL;
987 }
988
989 if (!info->fbops->fb_check_var) {
990 *var = info->var;
991 goto done;
992 }
993
994 ret = info->fbops->fb_check_var(var, info);
995
996 if (ret)
997 goto done;
998
999 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1000 struct fb_var_screeninfo old_var;
1001 struct fb_videomode mode;
1002
1003 if (info->fbops->fb_get_caps) {
1004 ret = fb_check_caps(info, var, activate);
1005
1006 if (ret)
1007 goto done;
1008 }
1009
1010 old_var = info->var;
1011 info->var = *var;
1012
1013 if (info->fbops->fb_set_par) {
1014 ret = info->fbops->fb_set_par(info);
1015
1016 if (ret) {
1017 info->var = old_var;
1018 printk(KERN_WARNING "detected "
1019 "fb_set_par error, "
1020 "error code: %d\n", ret);
1021 goto done;
1022 }
1023 }
1024
1025 fb_pan_display(info, &info->var);
1026 fb_set_cmap(&info->cmap, info);
1027 fb_var_to_videomode(&mode, &info->var);
1028
1029 if (info->modelist.prev && info->modelist.next &&
1030 !list_empty(&info->modelist))
1031 ret = fb_add_videomode(&mode, &info->modelist);
1032
1033 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1034 struct fb_event event;
1035 int evnt = (activate & FB_ACTIVATE_ALL) ?
1036 FB_EVENT_MODE_CHANGE_ALL :
1037 FB_EVENT_MODE_CHANGE;
1038
1039 info->flags &= ~FBINFO_MISC_USEREVENT;
1040 event.info = info;
1041 event.data = &mode;
1042 fb_notifier_call_chain(evnt, &event);
1043 }
1044 }
1045 }
1046
1047 done:
1048 return ret;
1049 }
1050 EXPORT_SYMBOL(fb_set_var);
1051
1052 int
1053 fb_blank(struct fb_info *info, int blank)
1054 {
1055 struct fb_event event;
1056 int ret = -EINVAL, early_ret;
1057
1058 if (blank > FB_BLANK_POWERDOWN)
1059 blank = FB_BLANK_POWERDOWN;
1060
1061 event.info = info;
1062 event.data = &blank;
1063
1064 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1065
1066 if (info->fbops->fb_blank)
1067 ret = info->fbops->fb_blank(blank, info);
1068
1069 if (!ret)
1070 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1071 else {
1072 /*
1073 * if fb_blank is failed then revert effects of
1074 * the early blank event.
1075 */
1076 if (!early_ret)
1077 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1078 }
1079
1080 return ret;
1081 }
1082 EXPORT_SYMBOL(fb_blank);
1083
1084 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1085 unsigned long arg)
1086 {
1087 struct fb_ops *fb;
1088 struct fb_var_screeninfo var;
1089 struct fb_fix_screeninfo fix;
1090 struct fb_con2fbmap con2fb;
1091 struct fb_cmap cmap_from;
1092 struct fb_cmap_user cmap;
1093 struct fb_event event;
1094 void __user *argp = (void __user *)arg;
1095 long ret = 0;
1096
1097 switch (cmd) {
1098 case FBIOGET_VSCREENINFO:
1099 if (!lock_fb_info(info))
1100 return -ENODEV;
1101 var = info->var;
1102 unlock_fb_info(info);
1103
1104 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1105 break;
1106 case FBIOPUT_VSCREENINFO:
1107 if (copy_from_user(&var, argp, sizeof(var)))
1108 return -EFAULT;
1109 console_lock();
1110 if (!lock_fb_info(info)) {
1111 console_unlock();
1112 return -ENODEV;
1113 }
1114 info->flags |= FBINFO_MISC_USEREVENT;
1115 ret = fb_set_var(info, &var);
1116 info->flags &= ~FBINFO_MISC_USEREVENT;
1117 unlock_fb_info(info);
1118 console_unlock();
1119 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1120 ret = -EFAULT;
1121 break;
1122 case FBIOGET_FSCREENINFO:
1123 if (!lock_fb_info(info))
1124 return -ENODEV;
1125 memcpy(&fix, &info->fix, sizeof(fix));
1126 unlock_fb_info(info);
1127
1128 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1129 break;
1130 case FBIOPUTCMAP:
1131 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1132 return -EFAULT;
1133 ret = fb_set_user_cmap(&cmap, info);
1134 break;
1135 case FBIOGETCMAP:
1136 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1137 return -EFAULT;
1138 if (!lock_fb_info(info))
1139 return -ENODEV;
1140 cmap_from = info->cmap;
1141 unlock_fb_info(info);
1142 ret = fb_cmap_to_user(&cmap_from, &cmap);
1143 break;
1144 case FBIOPAN_DISPLAY:
1145 if (copy_from_user(&var, argp, sizeof(var)))
1146 return -EFAULT;
1147 console_lock();
1148 if (!lock_fb_info(info)) {
1149 console_unlock();
1150 return -ENODEV;
1151 }
1152 ret = fb_pan_display(info, &var);
1153 unlock_fb_info(info);
1154 console_unlock();
1155 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1156 return -EFAULT;
1157 break;
1158 case FBIO_CURSOR:
1159 ret = -EINVAL;
1160 break;
1161 case FBIOGET_CON2FBMAP:
1162 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1163 return -EFAULT;
1164 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1165 return -EINVAL;
1166 con2fb.framebuffer = -1;
1167 event.data = &con2fb;
1168 if (!lock_fb_info(info))
1169 return -ENODEV;
1170 event.info = info;
1171 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1172 unlock_fb_info(info);
1173 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1174 break;
1175 case FBIOPUT_CON2FBMAP:
1176 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1177 return -EFAULT;
1178 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1179 return -EINVAL;
1180 if (con2fb.framebuffer >= FB_MAX)
1181 return -EINVAL;
1182 if (!registered_fb[con2fb.framebuffer])
1183 request_module("fb%d", con2fb.framebuffer);
1184 if (!registered_fb[con2fb.framebuffer]) {
1185 ret = -EINVAL;
1186 break;
1187 }
1188 event.data = &con2fb;
1189 console_lock();
1190 if (!lock_fb_info(info)) {
1191 console_unlock();
1192 return -ENODEV;
1193 }
1194 event.info = info;
1195 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1196 unlock_fb_info(info);
1197 console_unlock();
1198 break;
1199 case FBIOBLANK:
1200 console_lock();
1201 if (!lock_fb_info(info)) {
1202 console_unlock();
1203 return -ENODEV;
1204 }
1205 info->flags |= FBINFO_MISC_USEREVENT;
1206 ret = fb_blank(info, arg);
1207 info->flags &= ~FBINFO_MISC_USEREVENT;
1208 unlock_fb_info(info);
1209 console_unlock();
1210 break;
1211 default:
1212 if (!lock_fb_info(info))
1213 return -ENODEV;
1214 fb = info->fbops;
1215 if (fb->fb_ioctl)
1216 ret = fb->fb_ioctl(info, cmd, arg);
1217 else
1218 ret = -ENOTTY;
1219 unlock_fb_info(info);
1220 }
1221 return ret;
1222 }
1223
1224 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1225 {
1226 struct fb_info *info = file_fb_info(file);
1227
1228 if (!info)
1229 return -ENODEV;
1230 return do_fb_ioctl(info, cmd, arg);
1231 }
1232
1233 #ifdef CONFIG_COMPAT
1234 struct fb_fix_screeninfo32 {
1235 char id[16];
1236 compat_caddr_t smem_start;
1237 u32 smem_len;
1238 u32 type;
1239 u32 type_aux;
1240 u32 visual;
1241 u16 xpanstep;
1242 u16 ypanstep;
1243 u16 ywrapstep;
1244 u32 line_length;
1245 compat_caddr_t mmio_start;
1246 u32 mmio_len;
1247 u32 accel;
1248 u16 reserved[3];
1249 };
1250
1251 struct fb_cmap32 {
1252 u32 start;
1253 u32 len;
1254 compat_caddr_t red;
1255 compat_caddr_t green;
1256 compat_caddr_t blue;
1257 compat_caddr_t transp;
1258 };
1259
1260 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1261 unsigned long arg)
1262 {
1263 struct fb_cmap_user __user *cmap;
1264 struct fb_cmap32 __user *cmap32;
1265 __u32 data;
1266 int err;
1267
1268 cmap = compat_alloc_user_space(sizeof(*cmap));
1269 cmap32 = compat_ptr(arg);
1270
1271 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1272 return -EFAULT;
1273
1274 if (get_user(data, &cmap32->red) ||
1275 put_user(compat_ptr(data), &cmap->red) ||
1276 get_user(data, &cmap32->green) ||
1277 put_user(compat_ptr(data), &cmap->green) ||
1278 get_user(data, &cmap32->blue) ||
1279 put_user(compat_ptr(data), &cmap->blue) ||
1280 get_user(data, &cmap32->transp) ||
1281 put_user(compat_ptr(data), &cmap->transp))
1282 return -EFAULT;
1283
1284 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1285
1286 if (!err) {
1287 if (copy_in_user(&cmap32->start,
1288 &cmap->start,
1289 2 * sizeof(__u32)))
1290 err = -EFAULT;
1291 }
1292 return err;
1293 }
1294
1295 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1296 struct fb_fix_screeninfo32 __user *fix32)
1297 {
1298 __u32 data;
1299 int err;
1300
1301 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1302
1303 data = (__u32) (unsigned long) fix->smem_start;
1304 err |= put_user(data, &fix32->smem_start);
1305
1306 err |= put_user(fix->smem_len, &fix32->smem_len);
1307 err |= put_user(fix->type, &fix32->type);
1308 err |= put_user(fix->type_aux, &fix32->type_aux);
1309 err |= put_user(fix->visual, &fix32->visual);
1310 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1311 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1312 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1313 err |= put_user(fix->line_length, &fix32->line_length);
1314
1315 data = (__u32) (unsigned long) fix->mmio_start;
1316 err |= put_user(data, &fix32->mmio_start);
1317
1318 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1319 err |= put_user(fix->accel, &fix32->accel);
1320 err |= copy_to_user(fix32->reserved, fix->reserved,
1321 sizeof(fix->reserved));
1322
1323 if (err)
1324 return -EFAULT;
1325 return 0;
1326 }
1327
1328 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1329 unsigned long arg)
1330 {
1331 struct fb_fix_screeninfo fix;
1332
1333 if (!lock_fb_info(info))
1334 return -ENODEV;
1335 fix = info->fix;
1336 unlock_fb_info(info);
1337 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1338 }
1339
1340 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1341 unsigned long arg)
1342 {
1343 struct fb_info *info = file_fb_info(file);
1344 struct fb_ops *fb;
1345 long ret = -ENOIOCTLCMD;
1346
1347 if (!info)
1348 return -ENODEV;
1349 fb = info->fbops;
1350 switch(cmd) {
1351 case FBIOGET_VSCREENINFO:
1352 case FBIOPUT_VSCREENINFO:
1353 case FBIOPAN_DISPLAY:
1354 case FBIOGET_CON2FBMAP:
1355 case FBIOPUT_CON2FBMAP:
1356 arg = (unsigned long) compat_ptr(arg);
1357 /* fall through */
1358 case FBIOBLANK:
1359 ret = do_fb_ioctl(info, cmd, arg);
1360 break;
1361
1362 case FBIOGET_FSCREENINFO:
1363 ret = fb_get_fscreeninfo(info, cmd, arg);
1364 break;
1365
1366 case FBIOGETCMAP:
1367 case FBIOPUTCMAP:
1368 ret = fb_getput_cmap(info, cmd, arg);
1369 break;
1370
1371 default:
1372 if (fb->fb_compat_ioctl)
1373 ret = fb->fb_compat_ioctl(info, cmd, arg);
1374 break;
1375 }
1376 return ret;
1377 }
1378 #endif
1379
1380 static int
1381 fb_mmap(struct file *file, struct vm_area_struct * vma)
1382 {
1383 struct fb_info *info = file_fb_info(file);
1384 struct fb_ops *fb;
1385 unsigned long mmio_pgoff;
1386 unsigned long start;
1387 u32 len;
1388
1389 if (!info)
1390 return -ENODEV;
1391 fb = info->fbops;
1392 if (!fb)
1393 return -ENODEV;
1394 mutex_lock(&info->mm_lock);
1395 if (fb->fb_mmap) {
1396 int res;
1397
1398 /*
1399 * The framebuffer needs to be accessed decrypted, be sure
1400 * SME protection is removed ahead of the call
1401 */
1402 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1403 res = fb->fb_mmap(info, vma);
1404 mutex_unlock(&info->mm_lock);
1405 return res;
1406 }
1407
1408 /*
1409 * Ugh. This can be either the frame buffer mapping, or
1410 * if pgoff points past it, the mmio mapping.
1411 */
1412 start = info->fix.smem_start;
1413 len = info->fix.smem_len;
1414 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1415 if (vma->vm_pgoff >= mmio_pgoff) {
1416 if (info->var.accel_flags) {
1417 mutex_unlock(&info->mm_lock);
1418 return -EINVAL;
1419 }
1420
1421 vma->vm_pgoff -= mmio_pgoff;
1422 start = info->fix.mmio_start;
1423 len = info->fix.mmio_len;
1424 }
1425 mutex_unlock(&info->mm_lock);
1426
1427 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1428 /*
1429 * The framebuffer needs to be accessed decrypted, be sure
1430 * SME protection is removed
1431 */
1432 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1433 fb_pgprotect(file, vma, start);
1434
1435 return vm_iomap_memory(vma, start, len);
1436 }
1437
1438 static int
1439 fb_open(struct inode *inode, struct file *file)
1440 __acquires(&info->lock)
1441 __releases(&info->lock)
1442 {
1443 int fbidx = iminor(inode);
1444 struct fb_info *info;
1445 int res = 0;
1446
1447 info = get_fb_info(fbidx);
1448 if (!info) {
1449 request_module("fb%d", fbidx);
1450 info = get_fb_info(fbidx);
1451 if (!info)
1452 return -ENODEV;
1453 }
1454 if (IS_ERR(info))
1455 return PTR_ERR(info);
1456
1457 mutex_lock(&info->lock);
1458 if (!try_module_get(info->fbops->owner)) {
1459 res = -ENODEV;
1460 goto out;
1461 }
1462 file->private_data = info;
1463 if (info->fbops->fb_open) {
1464 res = info->fbops->fb_open(info,1);
1465 if (res)
1466 module_put(info->fbops->owner);
1467 }
1468 #ifdef CONFIG_FB_DEFERRED_IO
1469 if (info->fbdefio)
1470 fb_deferred_io_open(info, inode, file);
1471 #endif
1472 out:
1473 mutex_unlock(&info->lock);
1474 if (res)
1475 put_fb_info(info);
1476 return res;
1477 }
1478
1479 static int
1480 fb_release(struct inode *inode, struct file *file)
1481 __acquires(&info->lock)
1482 __releases(&info->lock)
1483 {
1484 struct fb_info * const info = file->private_data;
1485
1486 mutex_lock(&info->lock);
1487 if (info->fbops->fb_release)
1488 info->fbops->fb_release(info,1);
1489 module_put(info->fbops->owner);
1490 mutex_unlock(&info->lock);
1491 put_fb_info(info);
1492 return 0;
1493 }
1494
1495 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1496 unsigned long get_fb_unmapped_area(struct file *filp,
1497 unsigned long addr, unsigned long len,
1498 unsigned long pgoff, unsigned long flags)
1499 {
1500 struct fb_info * const info = filp->private_data;
1501 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1502
1503 if (pgoff > fb_size || len > fb_size - pgoff)
1504 return -EINVAL;
1505
1506 return (unsigned long)info->screen_base + pgoff;
1507 }
1508 #endif
1509
1510 static const struct file_operations fb_fops = {
1511 .owner = THIS_MODULE,
1512 .read = fb_read,
1513 .write = fb_write,
1514 .unlocked_ioctl = fb_ioctl,
1515 #ifdef CONFIG_COMPAT
1516 .compat_ioctl = fb_compat_ioctl,
1517 #endif
1518 .mmap = fb_mmap,
1519 .open = fb_open,
1520 .release = fb_release,
1521 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1522 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1523 !defined(CONFIG_MMU))
1524 .get_unmapped_area = get_fb_unmapped_area,
1525 #endif
1526 #ifdef CONFIG_FB_DEFERRED_IO
1527 .fsync = fb_deferred_io_fsync,
1528 #endif
1529 .llseek = default_llseek,
1530 };
1531
1532 struct class *fb_class;
1533 EXPORT_SYMBOL(fb_class);
1534
1535 static int fb_check_foreignness(struct fb_info *fi)
1536 {
1537 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1538
1539 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1540
1541 #ifdef __BIG_ENDIAN
1542 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1543 #else
1544 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1545 #endif /* __BIG_ENDIAN */
1546
1547 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1548 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1549 "support this framebuffer\n", fi->fix.id);
1550 return -ENOSYS;
1551 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1552 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1553 "support this framebuffer\n", fi->fix.id);
1554 return -ENOSYS;
1555 }
1556
1557 return 0;
1558 }
1559
1560 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1561 {
1562 /* is the generic aperture base the same as the HW one */
1563 if (gen->base == hw->base)
1564 return true;
1565 /* is the generic aperture base inside the hw base->hw base+size */
1566 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1567 return true;
1568 return false;
1569 }
1570
1571 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1572 struct apertures_struct *hwa)
1573 {
1574 int i, j;
1575 if (!hwa || !gena)
1576 return false;
1577
1578 for (i = 0; i < hwa->count; ++i) {
1579 struct aperture *h = &hwa->ranges[i];
1580 for (j = 0; j < gena->count; ++j) {
1581 struct aperture *g = &gena->ranges[j];
1582 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1583 (unsigned long long)g->base,
1584 (unsigned long long)g->size,
1585 (unsigned long long)h->base,
1586 (unsigned long long)h->size);
1587 if (apertures_overlap(g, h))
1588 return true;
1589 }
1590 }
1591
1592 return false;
1593 }
1594
1595 static int do_unregister_framebuffer(struct fb_info *fb_info);
1596
1597 #define VGA_FB_PHYS 0xA0000
1598 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1599 const char *name, bool primary)
1600 {
1601 int i, ret;
1602
1603 /* check all firmware fbs and kick off if the base addr overlaps */
1604 for_each_registered_fb(i) {
1605 struct apertures_struct *gen_aper;
1606
1607 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1608 continue;
1609
1610 gen_aper = registered_fb[i]->apertures;
1611 if (fb_do_apertures_overlap(gen_aper, a) ||
1612 (primary && gen_aper && gen_aper->count &&
1613 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1614
1615 printk(KERN_INFO "fb: switching to %s from %s\n",
1616 name, registered_fb[i]->fix.id);
1617 ret = do_unregister_framebuffer(registered_fb[i]);
1618 if (ret)
1619 return ret;
1620 }
1621 }
1622
1623 return 0;
1624 }
1625
1626 static bool lockless_register_fb;
1627 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1628 MODULE_PARM_DESC(lockless_register_fb,
1629 "Lockless framebuffer registration for debugging [default=off]");
1630
1631 static int do_register_framebuffer(struct fb_info *fb_info)
1632 {
1633 int i, ret;
1634 struct fb_event event;
1635 struct fb_videomode mode;
1636
1637 if (fb_check_foreignness(fb_info))
1638 return -ENOSYS;
1639
1640 ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1641 fb_info->fix.id,
1642 fb_is_primary_device(fb_info));
1643 if (ret)
1644 return ret;
1645
1646 if (num_registered_fb == FB_MAX)
1647 return -ENXIO;
1648
1649 num_registered_fb++;
1650 for (i = 0 ; i < FB_MAX; i++)
1651 if (!registered_fb[i])
1652 break;
1653 fb_info->node = i;
1654 atomic_set(&fb_info->count, 1);
1655 mutex_init(&fb_info->lock);
1656 mutex_init(&fb_info->mm_lock);
1657
1658 fb_info->dev = device_create(fb_class, fb_info->device,
1659 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1660 if (IS_ERR(fb_info->dev)) {
1661 /* Not fatal */
1662 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1663 fb_info->dev = NULL;
1664 } else
1665 fb_init_device(fb_info);
1666
1667 if (fb_info->pixmap.addr == NULL) {
1668 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1669 if (fb_info->pixmap.addr) {
1670 fb_info->pixmap.size = FBPIXMAPSIZE;
1671 fb_info->pixmap.buf_align = 1;
1672 fb_info->pixmap.scan_align = 1;
1673 fb_info->pixmap.access_align = 32;
1674 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1675 }
1676 }
1677 fb_info->pixmap.offset = 0;
1678
1679 if (!fb_info->pixmap.blit_x)
1680 fb_info->pixmap.blit_x = ~(u32)0;
1681
1682 if (!fb_info->pixmap.blit_y)
1683 fb_info->pixmap.blit_y = ~(u32)0;
1684
1685 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1686 INIT_LIST_HEAD(&fb_info->modelist);
1687
1688 if (fb_info->skip_vt_switch)
1689 pm_vt_switch_required(fb_info->dev, false);
1690 else
1691 pm_vt_switch_required(fb_info->dev, true);
1692
1693 fb_var_to_videomode(&mode, &fb_info->var);
1694 fb_add_videomode(&mode, &fb_info->modelist);
1695 registered_fb[i] = fb_info;
1696
1697 event.info = fb_info;
1698 if (!lockless_register_fb)
1699 console_lock();
1700 else
1701 atomic_inc(&ignore_console_lock_warning);
1702 if (!lock_fb_info(fb_info)) {
1703 ret = -ENODEV;
1704 goto unlock_console;
1705 }
1706 ret = 0;
1707
1708 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1709 unlock_fb_info(fb_info);
1710 unlock_console:
1711 if (!lockless_register_fb)
1712 console_unlock();
1713 else
1714 atomic_dec(&ignore_console_lock_warning);
1715 return ret;
1716 }
1717
1718 static int unbind_console(struct fb_info *fb_info)
1719 {
1720 struct fb_event event;
1721 int ret;
1722 int i = fb_info->node;
1723
1724 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1725 return -EINVAL;
1726
1727 console_lock();
1728 if (!lock_fb_info(fb_info)) {
1729 console_unlock();
1730 return -ENODEV;
1731 }
1732
1733 event.info = fb_info;
1734 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1735 unlock_fb_info(fb_info);
1736 console_unlock();
1737
1738 return ret;
1739 }
1740
1741 static int __unlink_framebuffer(struct fb_info *fb_info);
1742
1743 static int do_unregister_framebuffer(struct fb_info *fb_info)
1744 {
1745 struct fb_event event;
1746 int ret;
1747
1748 ret = unbind_console(fb_info);
1749
1750 if (ret)
1751 return -EINVAL;
1752
1753 pm_vt_switch_unregister(fb_info->dev);
1754
1755 __unlink_framebuffer(fb_info);
1756 if (fb_info->pixmap.addr &&
1757 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1758 kfree(fb_info->pixmap.addr);
1759 fb_destroy_modelist(&fb_info->modelist);
1760 registered_fb[fb_info->node] = NULL;
1761 num_registered_fb--;
1762 fb_cleanup_device(fb_info);
1763 event.info = fb_info;
1764 console_lock();
1765 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1766 console_unlock();
1767
1768 /* this may free fb info */
1769 put_fb_info(fb_info);
1770 return 0;
1771 }
1772
1773 static int __unlink_framebuffer(struct fb_info *fb_info)
1774 {
1775 int i;
1776
1777 i = fb_info->node;
1778 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1779 return -EINVAL;
1780
1781 if (fb_info->dev) {
1782 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1783 fb_info->dev = NULL;
1784 }
1785
1786 return 0;
1787 }
1788
1789 int unlink_framebuffer(struct fb_info *fb_info)
1790 {
1791 int ret;
1792
1793 ret = __unlink_framebuffer(fb_info);
1794 if (ret)
1795 return ret;
1796
1797 unbind_console(fb_info);
1798
1799 return 0;
1800 }
1801 EXPORT_SYMBOL(unlink_framebuffer);
1802
1803 int remove_conflicting_framebuffers(struct apertures_struct *a,
1804 const char *name, bool primary)
1805 {
1806 int ret;
1807
1808 mutex_lock(&registration_lock);
1809 ret = do_remove_conflicting_framebuffers(a, name, primary);
1810 mutex_unlock(&registration_lock);
1811
1812 return ret;
1813 }
1814 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1815
1816 /**
1817 * register_framebuffer - registers a frame buffer device
1818 * @fb_info: frame buffer info structure
1819 *
1820 * Registers a frame buffer device @fb_info.
1821 *
1822 * Returns negative errno on error, or zero for success.
1823 *
1824 */
1825 int
1826 register_framebuffer(struct fb_info *fb_info)
1827 {
1828 int ret;
1829
1830 mutex_lock(&registration_lock);
1831 ret = do_register_framebuffer(fb_info);
1832 mutex_unlock(&registration_lock);
1833
1834 return ret;
1835 }
1836 EXPORT_SYMBOL(register_framebuffer);
1837
1838 /**
1839 * unregister_framebuffer - releases a frame buffer device
1840 * @fb_info: frame buffer info structure
1841 *
1842 * Unregisters a frame buffer device @fb_info.
1843 *
1844 * Returns negative errno on error, or zero for success.
1845 *
1846 * This function will also notify the framebuffer console
1847 * to release the driver.
1848 *
1849 * This is meant to be called within a driver's module_exit()
1850 * function. If this is called outside module_exit(), ensure
1851 * that the driver implements fb_open() and fb_release() to
1852 * check that no processes are using the device.
1853 */
1854 int
1855 unregister_framebuffer(struct fb_info *fb_info)
1856 {
1857 int ret;
1858
1859 mutex_lock(&registration_lock);
1860 ret = do_unregister_framebuffer(fb_info);
1861 mutex_unlock(&registration_lock);
1862
1863 return ret;
1864 }
1865 EXPORT_SYMBOL(unregister_framebuffer);
1866
1867 /**
1868 * fb_set_suspend - low level driver signals suspend
1869 * @info: framebuffer affected
1870 * @state: 0 = resuming, !=0 = suspending
1871 *
1872 * This is meant to be used by low level drivers to
1873 * signal suspend/resume to the core & clients.
1874 * It must be called with the console semaphore held
1875 */
1876 void fb_set_suspend(struct fb_info *info, int state)
1877 {
1878 struct fb_event event;
1879
1880 event.info = info;
1881 if (state) {
1882 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1883 info->state = FBINFO_STATE_SUSPENDED;
1884 } else {
1885 info->state = FBINFO_STATE_RUNNING;
1886 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1887 }
1888 }
1889 EXPORT_SYMBOL(fb_set_suspend);
1890
1891 /**
1892 * fbmem_init - init frame buffer subsystem
1893 *
1894 * Initialize the frame buffer subsystem.
1895 *
1896 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1897 *
1898 */
1899
1900 static int __init
1901 fbmem_init(void)
1902 {
1903 int ret;
1904
1905 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1906 return -ENOMEM;
1907
1908 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1909 if (ret) {
1910 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1911 goto err_chrdev;
1912 }
1913
1914 fb_class = class_create(THIS_MODULE, "graphics");
1915 if (IS_ERR(fb_class)) {
1916 ret = PTR_ERR(fb_class);
1917 pr_warn("Unable to create fb class; errno = %d\n", ret);
1918 fb_class = NULL;
1919 goto err_class;
1920 }
1921
1922 fb_console_init();
1923
1924 return 0;
1925
1926 err_class:
1927 unregister_chrdev(FB_MAJOR, "fb");
1928 err_chrdev:
1929 remove_proc_entry("fb", NULL);
1930 return ret;
1931 }
1932
1933 #ifdef MODULE
1934 module_init(fbmem_init);
1935 static void __exit
1936 fbmem_exit(void)
1937 {
1938 fb_console_exit();
1939
1940 remove_proc_entry("fb", NULL);
1941 class_destroy(fb_class);
1942 unregister_chrdev(FB_MAJOR, "fb");
1943 }
1944
1945 module_exit(fbmem_exit);
1946 MODULE_LICENSE("GPL");
1947 MODULE_DESCRIPTION("Framebuffer base");
1948 #else
1949 subsys_initcall(fbmem_init);
1950 #endif
1951
1952 int fb_new_modelist(struct fb_info *info)
1953 {
1954 struct fb_event event;
1955 struct fb_var_screeninfo var = info->var;
1956 struct list_head *pos, *n;
1957 struct fb_modelist *modelist;
1958 struct fb_videomode *m, mode;
1959 int err = 1;
1960
1961 list_for_each_safe(pos, n, &info->modelist) {
1962 modelist = list_entry(pos, struct fb_modelist, list);
1963 m = &modelist->mode;
1964 fb_videomode_to_var(&var, m);
1965 var.activate = FB_ACTIVATE_TEST;
1966 err = fb_set_var(info, &var);
1967 fb_var_to_videomode(&mode, &var);
1968 if (err || !fb_mode_is_equal(m, &mode)) {
1969 list_del(pos);
1970 kfree(pos);
1971 }
1972 }
1973
1974 err = 1;
1975
1976 if (!list_empty(&info->modelist)) {
1977 event.info = info;
1978 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1979 }
1980
1981 return err;
1982 }
1983
1984 MODULE_LICENSE("GPL");
Linux with added FPC-III support