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regulator: s2mps11: Adjust supported buck voltages to real values
[linux/fpc-iii.git] / drivers / video / fbdev / core / fbmem.c
blob4721491e6c8cf67ab100a957809f453ef405ab6b
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 #include <linux/pci.h>
38
39 #include <asm/fb.h>
40
41
42 /*
43 * Frame buffer device initialization and setup routines
44 */
45
46 #define FBPIXMAPSIZE (1024 * 8)
47
48 static DEFINE_MUTEX(registration_lock);
49
50 struct fb_info *registered_fb[FB_MAX] __read_mostly;
51 EXPORT_SYMBOL(registered_fb);
52
53 int num_registered_fb __read_mostly;
54 EXPORT_SYMBOL(num_registered_fb);
55
56 bool fb_center_logo __read_mostly;
57 EXPORT_SYMBOL(fb_center_logo);
58
59 static struct fb_info *get_fb_info(unsigned int idx)
60 {
61 struct fb_info *fb_info;
62
63 if (idx >= FB_MAX)
64 return ERR_PTR(-ENODEV);
65
66 mutex_lock(&registration_lock);
67 fb_info = registered_fb[idx];
68 if (fb_info)
69 atomic_inc(&fb_info->count);
70 mutex_unlock(&registration_lock);
71
72 return fb_info;
73 }
74
75 static void put_fb_info(struct fb_info *fb_info)
76 {
77 if (!atomic_dec_and_test(&fb_info->count))
78 return;
79 if (fb_info->fbops->fb_destroy)
80 fb_info->fbops->fb_destroy(fb_info);
81 }
82
83 int lock_fb_info(struct fb_info *info)
84 {
85 mutex_lock(&info->lock);
86 if (!info->fbops) {
87 mutex_unlock(&info->lock);
88 return 0;
89 }
90 return 1;
91 }
92 EXPORT_SYMBOL(lock_fb_info);
93
94 /*
95 * Helpers
96 */
97
98 int fb_get_color_depth(struct fb_var_screeninfo *var,
99 struct fb_fix_screeninfo *fix)
100 {
101 int depth = 0;
102
103 if (fix->visual == FB_VISUAL_MONO01 ||
104 fix->visual == FB_VISUAL_MONO10)
105 depth = 1;
106 else {
107 if (var->green.length == var->blue.length &&
108 var->green.length == var->red.length &&
109 var->green.offset == var->blue.offset &&
110 var->green.offset == var->red.offset)
111 depth = var->green.length;
112 else
113 depth = var->green.length + var->red.length +
114 var->blue.length;
115 }
116
117 return depth;
118 }
119 EXPORT_SYMBOL(fb_get_color_depth);
120
121 /*
122 * Data padding functions.
123 */
124 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
125 {
126 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
127 }
128 EXPORT_SYMBOL(fb_pad_aligned_buffer);
129
130 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
131 u32 shift_high, u32 shift_low, u32 mod)
132 {
133 u8 mask = (u8) (0xfff << shift_high), tmp;
134 int i, j;
135
136 for (i = height; i--; ) {
137 for (j = 0; j < idx; j++) {
138 tmp = dst[j];
139 tmp &= mask;
140 tmp |= *src >> shift_low;
141 dst[j] = tmp;
142 tmp = *src << shift_high;
143 dst[j+1] = tmp;
144 src++;
145 }
146 tmp = dst[idx];
147 tmp &= mask;
148 tmp |= *src >> shift_low;
149 dst[idx] = tmp;
150 if (shift_high < mod) {
151 tmp = *src << shift_high;
152 dst[idx+1] = tmp;
153 }
154 src++;
155 dst += d_pitch;
156 }
157 }
158 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
159
160 /*
161 * we need to lock this section since fb_cursor
162 * may use fb_imageblit()
163 */
164 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
165 {
166 u32 align = buf->buf_align - 1, offset;
167 char *addr = buf->addr;
168
169 /* If IO mapped, we need to sync before access, no sharing of
170 * the pixmap is done
171 */
172 if (buf->flags & FB_PIXMAP_IO) {
173 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
174 info->fbops->fb_sync(info);
175 return addr;
176 }
177
178 /* See if we fit in the remaining pixmap space */
179 offset = buf->offset + align;
180 offset &= ~align;
181 if (offset + size > buf->size) {
182 /* We do not fit. In order to be able to re-use the buffer,
183 * we must ensure no asynchronous DMA'ing or whatever operation
184 * is in progress, we sync for that.
185 */
186 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
187 info->fbops->fb_sync(info);
188 offset = 0;
189 }
190 buf->offset = offset + size;
191 addr += offset;
192
193 return addr;
194 }
195 EXPORT_SYMBOL(fb_get_buffer_offset);
196
197 #ifdef CONFIG_LOGO
198
199 static inline unsigned safe_shift(unsigned d, int n)
200 {
201 return n < 0 ? d >> -n : d << n;
202 }
203
204 static void fb_set_logocmap(struct fb_info *info,
205 const struct linux_logo *logo)
206 {
207 struct fb_cmap palette_cmap;
208 u16 palette_green[16];
209 u16 palette_blue[16];
210 u16 palette_red[16];
211 int i, j, n;
212 const unsigned char *clut = logo->clut;
213
214 palette_cmap.start = 0;
215 palette_cmap.len = 16;
216 palette_cmap.red = palette_red;
217 palette_cmap.green = palette_green;
218 palette_cmap.blue = palette_blue;
219 palette_cmap.transp = NULL;
220
221 for (i = 0; i < logo->clutsize; i += n) {
222 n = logo->clutsize - i;
223 /* palette_cmap provides space for only 16 colors at once */
224 if (n > 16)
225 n = 16;
226 palette_cmap.start = 32 + i;
227 palette_cmap.len = n;
228 for (j = 0; j < n; ++j) {
229 palette_cmap.red[j] = clut[0] << 8 | clut[0];
230 palette_cmap.green[j] = clut[1] << 8 | clut[1];
231 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
232 clut += 3;
233 }
234 fb_set_cmap(&palette_cmap, info);
235 }
236 }
237
238 static void fb_set_logo_truepalette(struct fb_info *info,
239 const struct linux_logo *logo,
240 u32 *palette)
241 {
242 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
243 unsigned char redmask, greenmask, bluemask;
244 int redshift, greenshift, blueshift;
245 int i;
246 const unsigned char *clut = logo->clut;
247
248 /*
249 * We have to create a temporary palette since console palette is only
250 * 16 colors long.
251 */
252 /* Bug: Doesn't obey msb_right ... (who needs that?) */
253 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
254 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
255 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
256 redshift = info->var.red.offset - (8 - info->var.red.length);
257 greenshift = info->var.green.offset - (8 - info->var.green.length);
258 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
259
260 for ( i = 0; i < logo->clutsize; i++) {
261 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
262 safe_shift((clut[1] & greenmask), greenshift) |
263 safe_shift((clut[2] & bluemask), blueshift));
264 clut += 3;
265 }
266 }
267
268 static void fb_set_logo_directpalette(struct fb_info *info,
269 const struct linux_logo *logo,
270 u32 *palette)
271 {
272 int redshift, greenshift, blueshift;
273 int i;
274
275 redshift = info->var.red.offset;
276 greenshift = info->var.green.offset;
277 blueshift = info->var.blue.offset;
278
279 for (i = 32; i < 32 + logo->clutsize; i++)
280 palette[i] = i << redshift | i << greenshift | i << blueshift;
281 }
282
283 static void fb_set_logo(struct fb_info *info,
284 const struct linux_logo *logo, u8 *dst,
285 int depth)
286 {
287 int i, j, k;
288 const u8 *src = logo->data;
289 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
290 u8 fg = 1, d;
291
292 switch (fb_get_color_depth(&info->var, &info->fix)) {
293 case 1:
294 fg = 1;
295 break;
296 case 2:
297 fg = 3;
298 break;
299 default:
300 fg = 7;
301 break;
302 }
303
304 if (info->fix.visual == FB_VISUAL_MONO01 ||
305 info->fix.visual == FB_VISUAL_MONO10)
306 fg = ~((u8) (0xfff << info->var.green.length));
307
308 switch (depth) {
309 case 4:
310 for (i = 0; i < logo->height; i++)
311 for (j = 0; j < logo->width; src++) {
312 *dst++ = *src >> 4;
313 j++;
314 if (j < logo->width) {
315 *dst++ = *src & 0x0f;
316 j++;
317 }
318 }
319 break;
320 case 1:
321 for (i = 0; i < logo->height; i++) {
322 for (j = 0; j < logo->width; src++) {
323 d = *src ^ xor;
324 for (k = 7; k >= 0 && j < logo->width; k--) {
325 *dst++ = ((d >> k) & 1) ? fg : 0;
326 j++;
327 }
328 }
329 }
330 break;
331 }
332 }
333
334 /*
335 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
336 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
337 * the visual format and color depth of the framebuffer, the DAC, the
338 * pseudo_palette, and the logo data will be adjusted accordingly.
339 *
340 * Case 1 - linux_logo_clut224:
341 * Color exceeds the number of console colors (16), thus we set the hardware DAC
342 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
343 *
344 * For visuals that require color info from the pseudo_palette, we also construct
345 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
346 * will be set.
347 *
348 * Case 2 - linux_logo_vga16:
349 * The number of colors just matches the console colors, thus there is no need
350 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
351 * each byte contains color information for two pixels (upper and lower nibble).
352 * To be consistent with fb_imageblit() usage, we therefore separate the two
353 * nibbles into separate bytes. The "depth" flag will be set to 4.
354 *
355 * Case 3 - linux_logo_mono:
356 * This is similar with Case 2. Each byte contains information for 8 pixels.
357 * We isolate each bit and expand each into a byte. The "depth" flag will
358 * be set to 1.
359 */
360 static struct logo_data {
361 int depth;
362 int needs_directpalette;
363 int needs_truepalette;
364 int needs_cmapreset;
365 const struct linux_logo *logo;
366 } fb_logo __read_mostly;
367
368 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
369 {
370 u32 size = width * height, i;
371
372 out += size - 1;
373
374 for (i = size; i--; )
375 *out-- = *in++;
376 }
377
378 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
379 {
380 int i, j, h = height - 1;
381
382 for (i = 0; i < height; i++)
383 for (j = 0; j < width; j++)
384 out[height * j + h - i] = *in++;
385 }
386
387 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
388 {
389 int i, j, w = width - 1;
390
391 for (i = 0; i < height; i++)
392 for (j = 0; j < width; j++)
393 out[height * (w - j) + i] = *in++;
394 }
395
396 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
397 struct fb_image *image, int rotate)
398 {
399 u32 tmp;
400
401 if (rotate == FB_ROTATE_UD) {
402 fb_rotate_logo_ud(image->data, dst, image->width,
403 image->height);
404 image->dx = info->var.xres - image->width - image->dx;
405 image->dy = info->var.yres - image->height - image->dy;
406 } else if (rotate == FB_ROTATE_CW) {
407 fb_rotate_logo_cw(image->data, dst, image->width,
408 image->height);
409 tmp = image->width;
410 image->width = image->height;
411 image->height = tmp;
412 tmp = image->dy;
413 image->dy = image->dx;
414 image->dx = info->var.xres - image->width - tmp;
415 } else if (rotate == FB_ROTATE_CCW) {
416 fb_rotate_logo_ccw(image->data, dst, image->width,
417 image->height);
418 tmp = image->width;
419 image->width = image->height;
420 image->height = tmp;
421 tmp = image->dx;
422 image->dx = image->dy;
423 image->dy = info->var.yres - image->height - tmp;
424 }
425
426 image->data = dst;
427 }
428
429 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
430 int rotate, unsigned int num)
431 {
432 unsigned int x;
433
434 if (image->width > info->var.xres || image->height > info->var.yres)
435 return;
436
437 if (rotate == FB_ROTATE_UR) {
438 for (x = 0;
439 x < num && image->dx + image->width <= info->var.xres;
440 x++) {
441 info->fbops->fb_imageblit(info, image);
442 image->dx += image->width + 8;
443 }
444 } else if (rotate == FB_ROTATE_UD) {
445 u32 dx = image->dx;
446
447 for (x = 0; x < num && image->dx <= dx; x++) {
448 info->fbops->fb_imageblit(info, image);
449 image->dx -= image->width + 8;
450 }
451 } else if (rotate == FB_ROTATE_CW) {
452 for (x = 0;
453 x < num && image->dy + image->height <= info->var.yres;
454 x++) {
455 info->fbops->fb_imageblit(info, image);
456 image->dy += image->height + 8;
457 }
458 } else if (rotate == FB_ROTATE_CCW) {
459 u32 dy = image->dy;
460
461 for (x = 0; x < num && image->dy <= dy; x++) {
462 info->fbops->fb_imageblit(info, image);
463 image->dy -= image->height + 8;
464 }
465 }
466 }
467
468 static int fb_show_logo_line(struct fb_info *info, int rotate,
469 const struct linux_logo *logo, int y,
470 unsigned int n)
471 {
472 u32 *palette = NULL, *saved_pseudo_palette = NULL;
473 unsigned char *logo_new = NULL, *logo_rotate = NULL;
474 struct fb_image image;
475
476 /* Return if the frame buffer is not mapped or suspended */
477 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
478 info->fbops->owner)
479 return 0;
480
481 image.depth = 8;
482 image.data = logo->data;
483
484 if (fb_logo.needs_cmapreset)
485 fb_set_logocmap(info, logo);
486
487 if (fb_logo.needs_truepalette ||
488 fb_logo.needs_directpalette) {
489 palette = kmalloc(256 * 4, GFP_KERNEL);
490 if (palette == NULL)
491 return 0;
492
493 if (fb_logo.needs_truepalette)
494 fb_set_logo_truepalette(info, logo, palette);
495 else
496 fb_set_logo_directpalette(info, logo, palette);
497
498 saved_pseudo_palette = info->pseudo_palette;
499 info->pseudo_palette = palette;
500 }
501
502 if (fb_logo.depth <= 4) {
503 logo_new = kmalloc_array(logo->width, logo->height,
504 GFP_KERNEL);
505 if (logo_new == NULL) {
506 kfree(palette);
507 if (saved_pseudo_palette)
508 info->pseudo_palette = saved_pseudo_palette;
509 return 0;
510 }
511 image.data = logo_new;
512 fb_set_logo(info, logo, logo_new, fb_logo.depth);
513 }
514
515 if (fb_center_logo) {
516 int xres = info->var.xres;
517 int yres = info->var.yres;
518
519 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
520 xres = info->var.yres;
521 yres = info->var.xres;
522 }
523
524 while (n && (n * (logo->width + 8) - 8 > xres))
525 --n;
526 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
527 image.dy = y ?: (yres - logo->height) / 2;
528 } else {
529 image.dx = 0;
530 image.dy = y;
531 }
532
533 image.width = logo->width;
534 image.height = logo->height;
535
536 if (rotate) {
537 logo_rotate = kmalloc_array(logo->width, logo->height,
538 GFP_KERNEL);
539 if (logo_rotate)
540 fb_rotate_logo(info, logo_rotate, &image, rotate);
541 }
542
543 fb_do_show_logo(info, &image, rotate, n);
544
545 kfree(palette);
546 if (saved_pseudo_palette != NULL)
547 info->pseudo_palette = saved_pseudo_palette;
548 kfree(logo_new);
549 kfree(logo_rotate);
550 return image.dy + logo->height;
551 }
552
553
554 #ifdef CONFIG_FB_LOGO_EXTRA
555
556 #define FB_LOGO_EX_NUM_MAX 10
557 static struct logo_data_extra {
558 const struct linux_logo *logo;
559 unsigned int n;
560 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
561 static unsigned int fb_logo_ex_num;
562
563 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
564 {
565 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
566 return;
567
568 fb_logo_ex[fb_logo_ex_num].logo = logo;
569 fb_logo_ex[fb_logo_ex_num].n = n;
570 fb_logo_ex_num++;
571 }
572
573 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
574 unsigned int yres)
575 {
576 unsigned int i;
577
578 /* FIXME: logo_ex supports only truecolor fb. */
579 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
580 fb_logo_ex_num = 0;
581
582 for (i = 0; i < fb_logo_ex_num; i++) {
583 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
584 fb_logo_ex[i].logo = NULL;
585 continue;
586 }
587 height += fb_logo_ex[i].logo->height;
588 if (height > yres) {
589 height -= fb_logo_ex[i].logo->height;
590 fb_logo_ex_num = i;
591 break;
592 }
593 }
594 return height;
595 }
596
597 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
598 {
599 unsigned int i;
600
601 for (i = 0; i < fb_logo_ex_num; i++)
602 y = fb_show_logo_line(info, rotate,
603 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
604
605 return y;
606 }
607
608 #else /* !CONFIG_FB_LOGO_EXTRA */
609
610 static inline int fb_prepare_extra_logos(struct fb_info *info,
611 unsigned int height,
612 unsigned int yres)
613 {
614 return height;
615 }
616
617 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
618 {
619 return y;
620 }
621
622 #endif /* CONFIG_FB_LOGO_EXTRA */
623
624
625 int fb_prepare_logo(struct fb_info *info, int rotate)
626 {
627 int depth = fb_get_color_depth(&info->var, &info->fix);
628 unsigned int yres;
629 int height;
630
631 memset(&fb_logo, 0, sizeof(struct logo_data));
632
633 if (info->flags & FBINFO_MISC_TILEBLITTING ||
634 info->fbops->owner)
635 return 0;
636
637 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
638 depth = info->var.blue.length;
639 if (info->var.red.length < depth)
640 depth = info->var.red.length;
641 if (info->var.green.length < depth)
642 depth = info->var.green.length;
643 }
644
645 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
646 /* assume console colormap */
647 depth = 4;
648 }
649
650 /* Return if no suitable logo was found */
651 fb_logo.logo = fb_find_logo(depth);
652
653 if (!fb_logo.logo) {
654 return 0;
655 }
656
657 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
658 yres = info->var.yres;
659 else
660 yres = info->var.xres;
661
662 if (fb_logo.logo->height > yres) {
663 fb_logo.logo = NULL;
664 return 0;
665 }
666
667 /* What depth we asked for might be different from what we get */
668 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
669 fb_logo.depth = 8;
670 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
671 fb_logo.depth = 4;
672 else
673 fb_logo.depth = 1;
674
675
676 if (fb_logo.depth > 4 && depth > 4) {
677 switch (info->fix.visual) {
678 case FB_VISUAL_TRUECOLOR:
679 fb_logo.needs_truepalette = 1;
680 break;
681 case FB_VISUAL_DIRECTCOLOR:
682 fb_logo.needs_directpalette = 1;
683 fb_logo.needs_cmapreset = 1;
684 break;
685 case FB_VISUAL_PSEUDOCOLOR:
686 fb_logo.needs_cmapreset = 1;
687 break;
688 }
689 }
690
691 height = fb_logo.logo->height;
692 if (fb_center_logo)
693 height += (yres - fb_logo.logo->height) / 2;
694
695 return fb_prepare_extra_logos(info, height, yres);
696 }
697
698 int fb_show_logo(struct fb_info *info, int rotate)
699 {
700 int y;
701
702 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
703 num_online_cpus());
704 y = fb_show_extra_logos(info, y, rotate);
705
706 return y;
707 }
708 #else
709 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
710 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
711 #endif /* CONFIG_LOGO */
712 EXPORT_SYMBOL(fb_prepare_logo);
713 EXPORT_SYMBOL(fb_show_logo);
714
715 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
716 {
717 mutex_lock(&registration_lock);
718 return (*pos < FB_MAX) ? pos : NULL;
719 }
720
721 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
722 {
723 (*pos)++;
724 return (*pos < FB_MAX) ? pos : NULL;
725 }
726
727 static void fb_seq_stop(struct seq_file *m, void *v)
728 {
729 mutex_unlock(&registration_lock);
730 }
731
732 static int fb_seq_show(struct seq_file *m, void *v)
733 {
734 int i = *(loff_t *)v;
735 struct fb_info *fi = registered_fb[i];
736
737 if (fi)
738 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
739 return 0;
740 }
741
742 static const struct seq_operations proc_fb_seq_ops = {
743 .start = fb_seq_start,
744 .next = fb_seq_next,
745 .stop = fb_seq_stop,
746 .show = fb_seq_show,
747 };
748
749 /*
750 * We hold a reference to the fb_info in file->private_data,
751 * but if the current registered fb has changed, we don't
752 * actually want to use it.
753 *
754 * So look up the fb_info using the inode minor number,
755 * and just verify it against the reference we have.
756 */
757 static struct fb_info *file_fb_info(struct file *file)
758 {
759 struct inode *inode = file_inode(file);
760 int fbidx = iminor(inode);
761 struct fb_info *info = registered_fb[fbidx];
762
763 if (info != file->private_data)
764 info = NULL;
765 return info;
766 }
767
768 static ssize_t
769 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
770 {
771 unsigned long p = *ppos;
772 struct fb_info *info = file_fb_info(file);
773 u8 *buffer, *dst;
774 u8 __iomem *src;
775 int c, cnt = 0, err = 0;
776 unsigned long total_size;
777
778 if (!info || ! info->screen_base)
779 return -ENODEV;
780
781 if (info->state != FBINFO_STATE_RUNNING)
782 return -EPERM;
783
784 if (info->fbops->fb_read)
785 return info->fbops->fb_read(info, buf, count, ppos);
786
787 total_size = info->screen_size;
788
789 if (total_size == 0)
790 total_size = info->fix.smem_len;
791
792 if (p >= total_size)
793 return 0;
794
795 if (count >= total_size)
796 count = total_size;
797
798 if (count + p > total_size)
799 count = total_size - p;
800
801 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
802 GFP_KERNEL);
803 if (!buffer)
804 return -ENOMEM;
805
806 src = (u8 __iomem *) (info->screen_base + p);
807
808 if (info->fbops->fb_sync)
809 info->fbops->fb_sync(info);
810
811 while (count) {
812 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
813 dst = buffer;
814 fb_memcpy_fromfb(dst, src, c);
815 dst += c;
816 src += c;
817
818 if (copy_to_user(buf, buffer, c)) {
819 err = -EFAULT;
820 break;
821 }
822 *ppos += c;
823 buf += c;
824 cnt += c;
825 count -= c;
826 }
827
828 kfree(buffer);
829
830 return (err) ? err : cnt;
831 }
832
833 static ssize_t
834 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
835 {
836 unsigned long p = *ppos;
837 struct fb_info *info = file_fb_info(file);
838 u8 *buffer, *src;
839 u8 __iomem *dst;
840 int c, cnt = 0, err = 0;
841 unsigned long total_size;
842
843 if (!info || !info->screen_base)
844 return -ENODEV;
845
846 if (info->state != FBINFO_STATE_RUNNING)
847 return -EPERM;
848
849 if (info->fbops->fb_write)
850 return info->fbops->fb_write(info, buf, count, ppos);
851
852 total_size = info->screen_size;
853
854 if (total_size == 0)
855 total_size = info->fix.smem_len;
856
857 if (p > total_size)
858 return -EFBIG;
859
860 if (count > total_size) {
861 err = -EFBIG;
862 count = total_size;
863 }
864
865 if (count + p > total_size) {
866 if (!err)
867 err = -ENOSPC;
868
869 count = total_size - p;
870 }
871
872 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
873 GFP_KERNEL);
874 if (!buffer)
875 return -ENOMEM;
876
877 dst = (u8 __iomem *) (info->screen_base + p);
878
879 if (info->fbops->fb_sync)
880 info->fbops->fb_sync(info);
881
882 while (count) {
883 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
884 src = buffer;
885
886 if (copy_from_user(src, buf, c)) {
887 err = -EFAULT;
888 break;
889 }
890
891 fb_memcpy_tofb(dst, src, c);
892 dst += c;
893 src += c;
894 *ppos += c;
895 buf += c;
896 cnt += c;
897 count -= c;
898 }
899
900 kfree(buffer);
901
902 return (cnt) ? cnt : err;
903 }
904
905 int
906 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
907 {
908 struct fb_fix_screeninfo *fix = &info->fix;
909 unsigned int yres = info->var.yres;
910 int err = 0;
911
912 if (var->yoffset > 0) {
913 if (var->vmode & FB_VMODE_YWRAP) {
914 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
915 err = -EINVAL;
916 else
917 yres = 0;
918 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
919 err = -EINVAL;
920 }
921
922 if (var->xoffset > 0 && (!fix->xpanstep ||
923 (var->xoffset % fix->xpanstep)))
924 err = -EINVAL;
925
926 if (err || !info->fbops->fb_pan_display ||
927 var->yoffset > info->var.yres_virtual - yres ||
928 var->xoffset > info->var.xres_virtual - info->var.xres)
929 return -EINVAL;
930
931 if ((err = info->fbops->fb_pan_display(var, info)))
932 return err;
933 info->var.xoffset = var->xoffset;
934 info->var.yoffset = var->yoffset;
935 if (var->vmode & FB_VMODE_YWRAP)
936 info->var.vmode |= FB_VMODE_YWRAP;
937 else
938 info->var.vmode &= ~FB_VMODE_YWRAP;
939 return 0;
940 }
941 EXPORT_SYMBOL(fb_pan_display);
942
943 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
944 u32 activate)
945 {
946 struct fb_event event;
947 struct fb_blit_caps caps, fbcaps;
948 int err = 0;
949
950 memset(&caps, 0, sizeof(caps));
951 memset(&fbcaps, 0, sizeof(fbcaps));
952 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
953 event.info = info;
954 event.data = &caps;
955 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
956 info->fbops->fb_get_caps(info, &fbcaps, var);
957
958 if (((fbcaps.x ^ caps.x) & caps.x) ||
959 ((fbcaps.y ^ caps.y) & caps.y) ||
960 (fbcaps.len < caps.len))
961 err = -EINVAL;
962
963 return err;
964 }
965
966 int
967 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
968 {
969 int flags = info->flags;
970 int ret = 0;
971
972 if (var->activate & FB_ACTIVATE_INV_MODE) {
973 struct fb_videomode mode1, mode2;
974
975 fb_var_to_videomode(&mode1, var);
976 fb_var_to_videomode(&mode2, &info->var);
977 /* make sure we don't delete the videomode of current var */
978 ret = fb_mode_is_equal(&mode1, &mode2);
979
980 if (!ret) {
981 struct fb_event event;
982
983 event.info = info;
984 event.data = &mode1;
985 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
986 }
987
988 if (!ret)
989 fb_delete_videomode(&mode1, &info->modelist);
990
991
992 ret = (ret) ? -EINVAL : 0;
993 goto done;
994 }
995
996 if ((var->activate & FB_ACTIVATE_FORCE) ||
997 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
998 u32 activate = var->activate;
999
1000 /* When using FOURCC mode, make sure the red, green, blue and
1001 * transp fields are set to 0.
1002 */
1003 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
1004 var->grayscale > 1) {
1005 if (var->red.offset || var->green.offset ||
1006 var->blue.offset || var->transp.offset ||
1007 var->red.length || var->green.length ||
1008 var->blue.length || var->transp.length ||
1009 var->red.msb_right || var->green.msb_right ||
1010 var->blue.msb_right || var->transp.msb_right)
1011 return -EINVAL;
1012 }
1013
1014 if (!info->fbops->fb_check_var) {
1015 *var = info->var;
1016 goto done;
1017 }
1018
1019 ret = info->fbops->fb_check_var(var, info);
1020
1021 if (ret)
1022 goto done;
1023
1024 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1025 struct fb_var_screeninfo old_var;
1026 struct fb_videomode mode;
1027
1028 if (info->fbops->fb_get_caps) {
1029 ret = fb_check_caps(info, var, activate);
1030
1031 if (ret)
1032 goto done;
1033 }
1034
1035 old_var = info->var;
1036 info->var = *var;
1037
1038 if (info->fbops->fb_set_par) {
1039 ret = info->fbops->fb_set_par(info);
1040
1041 if (ret) {
1042 info->var = old_var;
1043 printk(KERN_WARNING "detected "
1044 "fb_set_par error, "
1045 "error code: %d\n", ret);
1046 goto done;
1047 }
1048 }
1049
1050 fb_pan_display(info, &info->var);
1051 fb_set_cmap(&info->cmap, info);
1052 fb_var_to_videomode(&mode, &info->var);
1053
1054 if (info->modelist.prev && info->modelist.next &&
1055 !list_empty(&info->modelist))
1056 ret = fb_add_videomode(&mode, &info->modelist);
1057
1058 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1059 struct fb_event event;
1060 int evnt = (activate & FB_ACTIVATE_ALL) ?
1061 FB_EVENT_MODE_CHANGE_ALL :
1062 FB_EVENT_MODE_CHANGE;
1063
1064 info->flags &= ~FBINFO_MISC_USEREVENT;
1065 event.info = info;
1066 event.data = &mode;
1067 fb_notifier_call_chain(evnt, &event);
1068 }
1069 }
1070 }
1071
1072 done:
1073 return ret;
1074 }
1075 EXPORT_SYMBOL(fb_set_var);
1076
1077 int
1078 fb_blank(struct fb_info *info, int blank)
1079 {
1080 struct fb_event event;
1081 int ret = -EINVAL, early_ret;
1082
1083 if (blank > FB_BLANK_POWERDOWN)
1084 blank = FB_BLANK_POWERDOWN;
1085
1086 event.info = info;
1087 event.data = &blank;
1088
1089 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1090
1091 if (info->fbops->fb_blank)
1092 ret = info->fbops->fb_blank(blank, info);
1093
1094 if (!ret)
1095 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1096 else {
1097 /*
1098 * if fb_blank is failed then revert effects of
1099 * the early blank event.
1100 */
1101 if (!early_ret)
1102 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1103 }
1104
1105 return ret;
1106 }
1107 EXPORT_SYMBOL(fb_blank);
1108
1109 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1110 unsigned long arg)
1111 {
1112 struct fb_ops *fb;
1113 struct fb_var_screeninfo var;
1114 struct fb_fix_screeninfo fix;
1115 struct fb_con2fbmap con2fb;
1116 struct fb_cmap cmap_from;
1117 struct fb_cmap_user cmap;
1118 struct fb_event event;
1119 void __user *argp = (void __user *)arg;
1120 long ret = 0;
1121
1122 switch (cmd) {
1123 case FBIOGET_VSCREENINFO:
1124 if (!lock_fb_info(info))
1125 return -ENODEV;
1126 var = info->var;
1127 unlock_fb_info(info);
1128
1129 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1130 break;
1131 case FBIOPUT_VSCREENINFO:
1132 if (copy_from_user(&var, argp, sizeof(var)))
1133 return -EFAULT;
1134 console_lock();
1135 if (!lock_fb_info(info)) {
1136 console_unlock();
1137 return -ENODEV;
1138 }
1139 info->flags |= FBINFO_MISC_USEREVENT;
1140 ret = fb_set_var(info, &var);
1141 info->flags &= ~FBINFO_MISC_USEREVENT;
1142 unlock_fb_info(info);
1143 console_unlock();
1144 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1145 ret = -EFAULT;
1146 break;
1147 case FBIOGET_FSCREENINFO:
1148 if (!lock_fb_info(info))
1149 return -ENODEV;
1150 fix = info->fix;
1151 if (info->flags & FBINFO_HIDE_SMEM_START)
1152 fix.smem_start = 0;
1153 unlock_fb_info(info);
1154
1155 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1156 break;
1157 case FBIOPUTCMAP:
1158 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1159 return -EFAULT;
1160 ret = fb_set_user_cmap(&cmap, info);
1161 break;
1162 case FBIOGETCMAP:
1163 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1164 return -EFAULT;
1165 if (!lock_fb_info(info))
1166 return -ENODEV;
1167 cmap_from = info->cmap;
1168 unlock_fb_info(info);
1169 ret = fb_cmap_to_user(&cmap_from, &cmap);
1170 break;
1171 case FBIOPAN_DISPLAY:
1172 if (copy_from_user(&var, argp, sizeof(var)))
1173 return -EFAULT;
1174 console_lock();
1175 if (!lock_fb_info(info)) {
1176 console_unlock();
1177 return -ENODEV;
1178 }
1179 ret = fb_pan_display(info, &var);
1180 unlock_fb_info(info);
1181 console_unlock();
1182 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1183 return -EFAULT;
1184 break;
1185 case FBIO_CURSOR:
1186 ret = -EINVAL;
1187 break;
1188 case FBIOGET_CON2FBMAP:
1189 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1190 return -EFAULT;
1191 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1192 return -EINVAL;
1193 con2fb.framebuffer = -1;
1194 event.data = &con2fb;
1195 if (!lock_fb_info(info))
1196 return -ENODEV;
1197 event.info = info;
1198 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1199 unlock_fb_info(info);
1200 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1201 break;
1202 case FBIOPUT_CON2FBMAP:
1203 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1204 return -EFAULT;
1205 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1206 return -EINVAL;
1207 if (con2fb.framebuffer >= FB_MAX)
1208 return -EINVAL;
1209 if (!registered_fb[con2fb.framebuffer])
1210 request_module("fb%d", con2fb.framebuffer);
1211 if (!registered_fb[con2fb.framebuffer]) {
1212 ret = -EINVAL;
1213 break;
1214 }
1215 event.data = &con2fb;
1216 console_lock();
1217 if (!lock_fb_info(info)) {
1218 console_unlock();
1219 return -ENODEV;
1220 }
1221 event.info = info;
1222 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1223 unlock_fb_info(info);
1224 console_unlock();
1225 break;
1226 case FBIOBLANK:
1227 console_lock();
1228 if (!lock_fb_info(info)) {
1229 console_unlock();
1230 return -ENODEV;
1231 }
1232 info->flags |= FBINFO_MISC_USEREVENT;
1233 ret = fb_blank(info, arg);
1234 info->flags &= ~FBINFO_MISC_USEREVENT;
1235 unlock_fb_info(info);
1236 console_unlock();
1237 break;
1238 default:
1239 if (!lock_fb_info(info))
1240 return -ENODEV;
1241 fb = info->fbops;
1242 if (fb->fb_ioctl)
1243 ret = fb->fb_ioctl(info, cmd, arg);
1244 else
1245 ret = -ENOTTY;
1246 unlock_fb_info(info);
1247 }
1248 return ret;
1249 }
1250
1251 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1252 {
1253 struct fb_info *info = file_fb_info(file);
1254
1255 if (!info)
1256 return -ENODEV;
1257 return do_fb_ioctl(info, cmd, arg);
1258 }
1259
1260 #ifdef CONFIG_COMPAT
1261 struct fb_fix_screeninfo32 {
1262 char id[16];
1263 compat_caddr_t smem_start;
1264 u32 smem_len;
1265 u32 type;
1266 u32 type_aux;
1267 u32 visual;
1268 u16 xpanstep;
1269 u16 ypanstep;
1270 u16 ywrapstep;
1271 u32 line_length;
1272 compat_caddr_t mmio_start;
1273 u32 mmio_len;
1274 u32 accel;
1275 u16 reserved[3];
1276 };
1277
1278 struct fb_cmap32 {
1279 u32 start;
1280 u32 len;
1281 compat_caddr_t red;
1282 compat_caddr_t green;
1283 compat_caddr_t blue;
1284 compat_caddr_t transp;
1285 };
1286
1287 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1288 unsigned long arg)
1289 {
1290 struct fb_cmap_user __user *cmap;
1291 struct fb_cmap32 __user *cmap32;
1292 __u32 data;
1293 int err;
1294
1295 cmap = compat_alloc_user_space(sizeof(*cmap));
1296 cmap32 = compat_ptr(arg);
1297
1298 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1299 return -EFAULT;
1300
1301 if (get_user(data, &cmap32->red) ||
1302 put_user(compat_ptr(data), &cmap->red) ||
1303 get_user(data, &cmap32->green) ||
1304 put_user(compat_ptr(data), &cmap->green) ||
1305 get_user(data, &cmap32->blue) ||
1306 put_user(compat_ptr(data), &cmap->blue) ||
1307 get_user(data, &cmap32->transp) ||
1308 put_user(compat_ptr(data), &cmap->transp))
1309 return -EFAULT;
1310
1311 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1312
1313 if (!err) {
1314 if (copy_in_user(&cmap32->start,
1315 &cmap->start,
1316 2 * sizeof(__u32)))
1317 err = -EFAULT;
1318 }
1319 return err;
1320 }
1321
1322 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1323 struct fb_fix_screeninfo32 __user *fix32)
1324 {
1325 __u32 data;
1326 int err;
1327
1328 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1329
1330 data = (__u32) (unsigned long) fix->smem_start;
1331 err |= put_user(data, &fix32->smem_start);
1332
1333 err |= put_user(fix->smem_len, &fix32->smem_len);
1334 err |= put_user(fix->type, &fix32->type);
1335 err |= put_user(fix->type_aux, &fix32->type_aux);
1336 err |= put_user(fix->visual, &fix32->visual);
1337 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1338 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1339 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1340 err |= put_user(fix->line_length, &fix32->line_length);
1341
1342 data = (__u32) (unsigned long) fix->mmio_start;
1343 err |= put_user(data, &fix32->mmio_start);
1344
1345 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1346 err |= put_user(fix->accel, &fix32->accel);
1347 err |= copy_to_user(fix32->reserved, fix->reserved,
1348 sizeof(fix->reserved));
1349
1350 if (err)
1351 return -EFAULT;
1352 return 0;
1353 }
1354
1355 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1356 unsigned long arg)
1357 {
1358 struct fb_fix_screeninfo fix;
1359
1360 if (!lock_fb_info(info))
1361 return -ENODEV;
1362 fix = info->fix;
1363 if (info->flags & FBINFO_HIDE_SMEM_START)
1364 fix.smem_start = 0;
1365 unlock_fb_info(info);
1366 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1367 }
1368
1369 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1370 unsigned long arg)
1371 {
1372 struct fb_info *info = file_fb_info(file);
1373 struct fb_ops *fb;
1374 long ret = -ENOIOCTLCMD;
1375
1376 if (!info)
1377 return -ENODEV;
1378 fb = info->fbops;
1379 switch(cmd) {
1380 case FBIOGET_VSCREENINFO:
1381 case FBIOPUT_VSCREENINFO:
1382 case FBIOPAN_DISPLAY:
1383 case FBIOGET_CON2FBMAP:
1384 case FBIOPUT_CON2FBMAP:
1385 arg = (unsigned long) compat_ptr(arg);
1386 /* fall through */
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
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
1427 /*
1428 * The framebuffer needs to be accessed decrypted, be sure
1429 * SME protection is removed ahead of the call
1430 */
1431 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1432 res = fb->fb_mmap(info, vma);
1433 mutex_unlock(&info->mm_lock);
1434 return res;
1435 }
1436
1437 /*
1438 * Ugh. This can be either the frame buffer mapping, or
1439 * if pgoff points past it, the mmio mapping.
1440 */
1441 start = info->fix.smem_start;
1442 len = info->fix.smem_len;
1443 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1444 if (vma->vm_pgoff >= mmio_pgoff) {
1445 if (info->var.accel_flags) {
1446 mutex_unlock(&info->mm_lock);
1447 return -EINVAL;
1448 }
1449
1450 vma->vm_pgoff -= mmio_pgoff;
1451 start = info->fix.mmio_start;
1452 len = info->fix.mmio_len;
1453 }
1454 mutex_unlock(&info->mm_lock);
1455
1456 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1457 /*
1458 * The framebuffer needs to be accessed decrypted, be sure
1459 * SME protection is removed
1460 */
1461 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1462 fb_pgprotect(file, vma, start);
1463
1464 return vm_iomap_memory(vma, start, len);
1465 }
1466
1467 static int
1468 fb_open(struct inode *inode, struct file *file)
1469 __acquires(&info->lock)
1470 __releases(&info->lock)
1471 {
1472 int fbidx = iminor(inode);
1473 struct fb_info *info;
1474 int res = 0;
1475
1476 info = get_fb_info(fbidx);
1477 if (!info) {
1478 request_module("fb%d", fbidx);
1479 info = get_fb_info(fbidx);
1480 if (!info)
1481 return -ENODEV;
1482 }
1483 if (IS_ERR(info))
1484 return PTR_ERR(info);
1485
1486 mutex_lock(&info->lock);
1487 if (!try_module_get(info->fbops->owner)) {
1488 res = -ENODEV;
1489 goto out;
1490 }
1491 file->private_data = info;
1492 if (info->fbops->fb_open) {
1493 res = info->fbops->fb_open(info,1);
1494 if (res)
1495 module_put(info->fbops->owner);
1496 }
1497 #ifdef CONFIG_FB_DEFERRED_IO
1498 if (info->fbdefio)
1499 fb_deferred_io_open(info, inode, file);
1500 #endif
1501 out:
1502 mutex_unlock(&info->lock);
1503 if (res)
1504 put_fb_info(info);
1505 return res;
1506 }
1507
1508 static int
1509 fb_release(struct inode *inode, struct file *file)
1510 __acquires(&info->lock)
1511 __releases(&info->lock)
1512 {
1513 struct fb_info * const info = file->private_data;
1514
1515 mutex_lock(&info->lock);
1516 if (info->fbops->fb_release)
1517 info->fbops->fb_release(info,1);
1518 module_put(info->fbops->owner);
1519 mutex_unlock(&info->lock);
1520 put_fb_info(info);
1521 return 0;
1522 }
1523
1524 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1525 unsigned long get_fb_unmapped_area(struct file *filp,
1526 unsigned long addr, unsigned long len,
1527 unsigned long pgoff, unsigned long flags)
1528 {
1529 struct fb_info * const info = filp->private_data;
1530 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1531
1532 if (pgoff > fb_size || len > fb_size - pgoff)
1533 return -EINVAL;
1534
1535 return (unsigned long)info->screen_base + pgoff;
1536 }
1537 #endif
1538
1539 static const struct file_operations fb_fops = {
1540 .owner = THIS_MODULE,
1541 .read = fb_read,
1542 .write = fb_write,
1543 .unlocked_ioctl = fb_ioctl,
1544 #ifdef CONFIG_COMPAT
1545 .compat_ioctl = fb_compat_ioctl,
1546 #endif
1547 .mmap = fb_mmap,
1548 .open = fb_open,
1549 .release = fb_release,
1550 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1551 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1552 !defined(CONFIG_MMU))
1553 .get_unmapped_area = get_fb_unmapped_area,
1554 #endif
1555 #ifdef CONFIG_FB_DEFERRED_IO
1556 .fsync = fb_deferred_io_fsync,
1557 #endif
1558 .llseek = default_llseek,
1559 };
1560
1561 struct class *fb_class;
1562 EXPORT_SYMBOL(fb_class);
1563
1564 static int fb_check_foreignness(struct fb_info *fi)
1565 {
1566 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1567
1568 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1569
1570 #ifdef __BIG_ENDIAN
1571 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1572 #else
1573 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1574 #endif /* __BIG_ENDIAN */
1575
1576 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1577 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1578 "support this framebuffer\n", fi->fix.id);
1579 return -ENOSYS;
1580 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1581 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1582 "support this framebuffer\n", fi->fix.id);
1583 return -ENOSYS;
1584 }
1585
1586 return 0;
1587 }
1588
1589 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1590 {
1591 /* is the generic aperture base the same as the HW one */
1592 if (gen->base == hw->base)
1593 return true;
1594 /* is the generic aperture base inside the hw base->hw base+size */
1595 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1596 return true;
1597 return false;
1598 }
1599
1600 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1601 struct apertures_struct *hwa)
1602 {
1603 int i, j;
1604 if (!hwa || !gena)
1605 return false;
1606
1607 for (i = 0; i < hwa->count; ++i) {
1608 struct aperture *h = &hwa->ranges[i];
1609 for (j = 0; j < gena->count; ++j) {
1610 struct aperture *g = &gena->ranges[j];
1611 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1612 (unsigned long long)g->base,
1613 (unsigned long long)g->size,
1614 (unsigned long long)h->base,
1615 (unsigned long long)h->size);
1616 if (apertures_overlap(g, h))
1617 return true;
1618 }
1619 }
1620
1621 return false;
1622 }
1623
1624 static int do_unregister_framebuffer(struct fb_info *fb_info);
1625
1626 #define VGA_FB_PHYS 0xA0000
1627 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1628 const char *name, bool primary)
1629 {
1630 int i, ret;
1631
1632 /* check all firmware fbs and kick off if the base addr overlaps */
1633 for_each_registered_fb(i) {
1634 struct apertures_struct *gen_aper;
1635
1636 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1637 continue;
1638
1639 gen_aper = registered_fb[i]->apertures;
1640 if (fb_do_apertures_overlap(gen_aper, a) ||
1641 (primary && gen_aper && gen_aper->count &&
1642 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1643
1644 printk(KERN_INFO "fb%d: switching to %s from %s\n",
1645 i, name, registered_fb[i]->fix.id);
1646 ret = do_unregister_framebuffer(registered_fb[i]);
1647 if (ret)
1648 return ret;
1649 }
1650 }
1651
1652 return 0;
1653 }
1654
1655 static bool lockless_register_fb;
1656 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1657 MODULE_PARM_DESC(lockless_register_fb,
1658 "Lockless framebuffer registration for debugging [default=off]");
1659
1660 static int do_register_framebuffer(struct fb_info *fb_info)
1661 {
1662 int i, ret;
1663 struct fb_event event;
1664 struct fb_videomode mode;
1665
1666 if (fb_check_foreignness(fb_info))
1667 return -ENOSYS;
1668
1669 ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1670 fb_info->fix.id,
1671 fb_is_primary_device(fb_info));
1672 if (ret)
1673 return ret;
1674
1675 if (num_registered_fb == FB_MAX)
1676 return -ENXIO;
1677
1678 num_registered_fb++;
1679 for (i = 0 ; i < FB_MAX; i++)
1680 if (!registered_fb[i])
1681 break;
1682 fb_info->node = i;
1683 atomic_set(&fb_info->count, 1);
1684 mutex_init(&fb_info->lock);
1685 mutex_init(&fb_info->mm_lock);
1686
1687 fb_info->dev = device_create(fb_class, fb_info->device,
1688 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1689 if (IS_ERR(fb_info->dev)) {
1690 /* Not fatal */
1691 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1692 fb_info->dev = NULL;
1693 } else
1694 fb_init_device(fb_info);
1695
1696 if (fb_info->pixmap.addr == NULL) {
1697 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1698 if (fb_info->pixmap.addr) {
1699 fb_info->pixmap.size = FBPIXMAPSIZE;
1700 fb_info->pixmap.buf_align = 1;
1701 fb_info->pixmap.scan_align = 1;
1702 fb_info->pixmap.access_align = 32;
1703 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1704 }
1705 }
1706 fb_info->pixmap.offset = 0;
1707
1708 if (!fb_info->pixmap.blit_x)
1709 fb_info->pixmap.blit_x = ~(u32)0;
1710
1711 if (!fb_info->pixmap.blit_y)
1712 fb_info->pixmap.blit_y = ~(u32)0;
1713
1714 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1715 INIT_LIST_HEAD(&fb_info->modelist);
1716
1717 if (fb_info->skip_vt_switch)
1718 pm_vt_switch_required(fb_info->dev, false);
1719 else
1720 pm_vt_switch_required(fb_info->dev, true);
1721
1722 fb_var_to_videomode(&mode, &fb_info->var);
1723 fb_add_videomode(&mode, &fb_info->modelist);
1724 registered_fb[i] = fb_info;
1725
1726 event.info = fb_info;
1727 if (!lockless_register_fb)
1728 console_lock();
1729 else
1730 atomic_inc(&ignore_console_lock_warning);
1731 if (!lock_fb_info(fb_info)) {
1732 ret = -ENODEV;
1733 goto unlock_console;
1734 }
1735 ret = 0;
1736
1737 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1738 unlock_fb_info(fb_info);
1739 unlock_console:
1740 if (!lockless_register_fb)
1741 console_unlock();
1742 else
1743 atomic_dec(&ignore_console_lock_warning);
1744 return ret;
1745 }
1746
1747 static int unbind_console(struct fb_info *fb_info)
1748 {
1749 struct fb_event event;
1750 int ret;
1751 int i = fb_info->node;
1752
1753 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1754 return -EINVAL;
1755
1756 console_lock();
1757 if (!lock_fb_info(fb_info)) {
1758 console_unlock();
1759 return -ENODEV;
1760 }
1761
1762 event.info = fb_info;
1763 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1764 unlock_fb_info(fb_info);
1765 console_unlock();
1766
1767 return ret;
1768 }
1769
1770 static int __unlink_framebuffer(struct fb_info *fb_info);
1771
1772 static int do_unregister_framebuffer(struct fb_info *fb_info)
1773 {
1774 struct fb_event event;
1775 int ret;
1776
1777 ret = unbind_console(fb_info);
1778
1779 if (ret)
1780 return -EINVAL;
1781
1782 pm_vt_switch_unregister(fb_info->dev);
1783
1784 __unlink_framebuffer(fb_info);
1785 if (fb_info->pixmap.addr &&
1786 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1787 kfree(fb_info->pixmap.addr);
1788 fb_destroy_modelist(&fb_info->modelist);
1789 registered_fb[fb_info->node] = NULL;
1790 num_registered_fb--;
1791 fb_cleanup_device(fb_info);
1792 event.info = fb_info;
1793 console_lock();
1794 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1795 console_unlock();
1796
1797 /* this may free fb info */
1798 put_fb_info(fb_info);
1799 return 0;
1800 }
1801
1802 static int __unlink_framebuffer(struct fb_info *fb_info)
1803 {
1804 int i;
1805
1806 i = fb_info->node;
1807 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1808 return -EINVAL;
1809
1810 if (fb_info->dev) {
1811 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1812 fb_info->dev = NULL;
1813 }
1814
1815 return 0;
1816 }
1817
1818 int unlink_framebuffer(struct fb_info *fb_info)
1819 {
1820 int ret;
1821
1822 ret = __unlink_framebuffer(fb_info);
1823 if (ret)
1824 return ret;
1825
1826 unbind_console(fb_info);
1827
1828 return 0;
1829 }
1830 EXPORT_SYMBOL(unlink_framebuffer);
1831
1832 /**
1833 * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1834 * @a: memory range, users of which are to be removed
1835 * @name: requesting driver name
1836 * @primary: also kick vga16fb if present
1837 *
1838 * This function removes framebuffer devices (initialized by firmware/bootloader)
1839 * which use memory range described by @a. If @a is NULL all such devices are
1840 * removed.
1841 */
1842 int remove_conflicting_framebuffers(struct apertures_struct *a,
1843 const char *name, bool primary)
1844 {
1845 int ret;
1846 bool do_free = false;
1847
1848 if (!a) {
1849 a = alloc_apertures(1);
1850 if (!a)
1851 return -ENOMEM;
1852
1853 a->ranges[0].base = 0;
1854 a->ranges[0].size = ~0;
1855 do_free = true;
1856 }
1857
1858 mutex_lock(&registration_lock);
1859 ret = do_remove_conflicting_framebuffers(a, name, primary);
1860 mutex_unlock(&registration_lock);
1861
1862 if (do_free)
1863 kfree(a);
1864
1865 return ret;
1866 }
1867 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1868
1869 /**
1870 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1871 * @pdev: PCI device
1872 * @res_id: index of PCI BAR configuring framebuffer memory
1873 * @name: requesting driver name
1874 *
1875 * This function removes framebuffer devices (eg. initialized by firmware)
1876 * using memory range configured for @pdev's BAR @res_id.
1877 *
1878 * The function assumes that PCI device with shadowed ROM drives a primary
1879 * display and so kicks out vga16fb.
1880 */
1881 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
1882 {
1883 struct apertures_struct *ap;
1884 bool primary = false;
1885 int err;
1886
1887 ap = alloc_apertures(1);
1888 if (!ap)
1889 return -ENOMEM;
1890
1891 ap->ranges[0].base = pci_resource_start(pdev, res_id);
1892 ap->ranges[0].size = pci_resource_len(pdev, res_id);
1893 #ifdef CONFIG_X86
1894 primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1895 IORESOURCE_ROM_SHADOW;
1896 #endif
1897 err = remove_conflicting_framebuffers(ap, name, primary);
1898 kfree(ap);
1899 return err;
1900 }
1901 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1902
1903 /**
1904 * register_framebuffer - registers a frame buffer device
1905 * @fb_info: frame buffer info structure
1906 *
1907 * Registers a frame buffer device @fb_info.
1908 *
1909 * Returns negative errno on error, or zero for success.
1910 *
1911 */
1912 int
1913 register_framebuffer(struct fb_info *fb_info)
1914 {
1915 int ret;
1916
1917 mutex_lock(&registration_lock);
1918 ret = do_register_framebuffer(fb_info);
1919 mutex_unlock(&registration_lock);
1920
1921 return ret;
1922 }
1923 EXPORT_SYMBOL(register_framebuffer);
1924
1925 /**
1926 * unregister_framebuffer - releases a frame buffer device
1927 * @fb_info: frame buffer info structure
1928 *
1929 * Unregisters a frame buffer device @fb_info.
1930 *
1931 * Returns negative errno on error, or zero for success.
1932 *
1933 * This function will also notify the framebuffer console
1934 * to release the driver.
1935 *
1936 * This is meant to be called within a driver's module_exit()
1937 * function. If this is called outside module_exit(), ensure
1938 * that the driver implements fb_open() and fb_release() to
1939 * check that no processes are using the device.
1940 */
1941 int
1942 unregister_framebuffer(struct fb_info *fb_info)
1943 {
1944 int ret;
1945
1946 mutex_lock(&registration_lock);
1947 ret = do_unregister_framebuffer(fb_info);
1948 mutex_unlock(&registration_lock);
1949
1950 return ret;
1951 }
1952 EXPORT_SYMBOL(unregister_framebuffer);
1953
1954 /**
1955 * fb_set_suspend - low level driver signals suspend
1956 * @info: framebuffer affected
1957 * @state: 0 = resuming, !=0 = suspending
1958 *
1959 * This is meant to be used by low level drivers to
1960 * signal suspend/resume to the core & clients.
1961 * It must be called with the console semaphore held
1962 */
1963 void fb_set_suspend(struct fb_info *info, int state)
1964 {
1965 struct fb_event event;
1966
1967 event.info = info;
1968 if (state) {
1969 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1970 info->state = FBINFO_STATE_SUSPENDED;
1971 } else {
1972 info->state = FBINFO_STATE_RUNNING;
1973 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1974 }
1975 }
1976 EXPORT_SYMBOL(fb_set_suspend);
1977
1978 /**
1979 * fbmem_init - init frame buffer subsystem
1980 *
1981 * Initialize the frame buffer subsystem.
1982 *
1983 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1984 *
1985 */
1986
1987 static int __init
1988 fbmem_init(void)
1989 {
1990 int ret;
1991
1992 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1993 return -ENOMEM;
1994
1995 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1996 if (ret) {
1997 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1998 goto err_chrdev;
1999 }
2000
2001 fb_class = class_create(THIS_MODULE, "graphics");
2002 if (IS_ERR(fb_class)) {
2003 ret = PTR_ERR(fb_class);
2004 pr_warn("Unable to create fb class; errno = %d\n", ret);
2005 fb_class = NULL;
2006 goto err_class;
2007 }
2008
2009 fb_console_init();
2010
2011 return 0;
2012
2013 err_class:
2014 unregister_chrdev(FB_MAJOR, "fb");
2015 err_chrdev:
2016 remove_proc_entry("fb", NULL);
2017 return ret;
2018 }
2019
2020 #ifdef MODULE
2021 module_init(fbmem_init);
2022 static void __exit
2023 fbmem_exit(void)
2024 {
2025 fb_console_exit();
2026
2027 remove_proc_entry("fb", NULL);
2028 class_destroy(fb_class);
2029 unregister_chrdev(FB_MAJOR, "fb");
2030 }
2031
2032 module_exit(fbmem_exit);
2033 MODULE_LICENSE("GPL");
2034 MODULE_DESCRIPTION("Framebuffer base");
2035 #else
2036 subsys_initcall(fbmem_init);
2037 #endif
2038
2039 int fb_new_modelist(struct fb_info *info)
2040 {
2041 struct fb_event event;
2042 struct fb_var_screeninfo var = info->var;
2043 struct list_head *pos, *n;
2044 struct fb_modelist *modelist;
2045 struct fb_videomode *m, mode;
2046 int err = 1;
2047
2048 list_for_each_safe(pos, n, &info->modelist) {
2049 modelist = list_entry(pos, struct fb_modelist, list);
2050 m = &modelist->mode;
2051 fb_videomode_to_var(&var, m);
2052 var.activate = FB_ACTIVATE_TEST;
2053 err = fb_set_var(info, &var);
2054 fb_var_to_videomode(&mode, &var);
2055 if (err || !fb_mode_is_equal(m, &mode)) {
2056 list_del(pos);
2057 kfree(pos);
2058 }
2059 }
2060
2061 err = 1;
2062
2063 if (!list_empty(&info->modelist)) {
2064 event.info = info;
2065 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
2066 }
2067
2068 return err;
2069 }
2070
2071 MODULE_LICENSE("GPL");
Linux with added FPC-III support