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Linux 4.16.11
[linux/fpc-iii.git] / drivers / video / fbdev / core / fbmem.c
blobf741ba8df01b8e28f4331f988d2b04219bb103b6
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 (rotate == FB_ROTATE_UR) {
431 for (x = 0;
432 x < num && image->dx + image->width <= info->var.xres;
433 x++) {
434 info->fbops->fb_imageblit(info, image);
435 image->dx += image->width + 8;
436 }
437 } else if (rotate == FB_ROTATE_UD) {
438 for (x = 0; x < num; x++) {
439 info->fbops->fb_imageblit(info, image);
440 image->dx -= image->width + 8;
441 }
442 } else if (rotate == FB_ROTATE_CW) {
443 for (x = 0;
444 x < num && image->dy + image->height <= info->var.yres;
445 x++) {
446 info->fbops->fb_imageblit(info, image);
447 image->dy += image->height + 8;
448 }
449 } else if (rotate == FB_ROTATE_CCW) {
450 for (x = 0; x < num; x++) {
451 info->fbops->fb_imageblit(info, image);
452 image->dy -= image->height + 8;
453 }
454 }
455 }
456
457 static int fb_show_logo_line(struct fb_info *info, int rotate,
458 const struct linux_logo *logo, int y,
459 unsigned int n)
460 {
461 u32 *palette = NULL, *saved_pseudo_palette = NULL;
462 unsigned char *logo_new = NULL, *logo_rotate = NULL;
463 struct fb_image image;
464
465 /* Return if the frame buffer is not mapped or suspended */
466 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
467 info->fbops->owner)
468 return 0;
469
470 image.depth = 8;
471 image.data = logo->data;
472
473 if (fb_logo.needs_cmapreset)
474 fb_set_logocmap(info, logo);
475
476 if (fb_logo.needs_truepalette ||
477 fb_logo.needs_directpalette) {
478 palette = kmalloc(256 * 4, GFP_KERNEL);
479 if (palette == NULL)
480 return 0;
481
482 if (fb_logo.needs_truepalette)
483 fb_set_logo_truepalette(info, logo, palette);
484 else
485 fb_set_logo_directpalette(info, logo, palette);
486
487 saved_pseudo_palette = info->pseudo_palette;
488 info->pseudo_palette = palette;
489 }
490
491 if (fb_logo.depth <= 4) {
492 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
493 if (logo_new == NULL) {
494 kfree(palette);
495 if (saved_pseudo_palette)
496 info->pseudo_palette = saved_pseudo_palette;
497 return 0;
498 }
499 image.data = logo_new;
500 fb_set_logo(info, logo, logo_new, fb_logo.depth);
501 }
502
503 image.dx = 0;
504 image.dy = y;
505 image.width = logo->width;
506 image.height = logo->height;
507
508 if (rotate) {
509 logo_rotate = kmalloc(logo->width *
510 logo->height, GFP_KERNEL);
511 if (logo_rotate)
512 fb_rotate_logo(info, logo_rotate, &image, rotate);
513 }
514
515 fb_do_show_logo(info, &image, rotate, n);
516
517 kfree(palette);
518 if (saved_pseudo_palette != NULL)
519 info->pseudo_palette = saved_pseudo_palette;
520 kfree(logo_new);
521 kfree(logo_rotate);
522 return logo->height;
523 }
524
525
526 #ifdef CONFIG_FB_LOGO_EXTRA
527
528 #define FB_LOGO_EX_NUM_MAX 10
529 static struct logo_data_extra {
530 const struct linux_logo *logo;
531 unsigned int n;
532 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
533 static unsigned int fb_logo_ex_num;
534
535 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
536 {
537 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
538 return;
539
540 fb_logo_ex[fb_logo_ex_num].logo = logo;
541 fb_logo_ex[fb_logo_ex_num].n = n;
542 fb_logo_ex_num++;
543 }
544
545 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
546 unsigned int yres)
547 {
548 unsigned int i;
549
550 /* FIXME: logo_ex supports only truecolor fb. */
551 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
552 fb_logo_ex_num = 0;
553
554 for (i = 0; i < fb_logo_ex_num; i++) {
555 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
556 fb_logo_ex[i].logo = NULL;
557 continue;
558 }
559 height += fb_logo_ex[i].logo->height;
560 if (height > yres) {
561 height -= fb_logo_ex[i].logo->height;
562 fb_logo_ex_num = i;
563 break;
564 }
565 }
566 return height;
567 }
568
569 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
570 {
571 unsigned int i;
572
573 for (i = 0; i < fb_logo_ex_num; i++)
574 y += fb_show_logo_line(info, rotate,
575 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
576
577 return y;
578 }
579
580 #else /* !CONFIG_FB_LOGO_EXTRA */
581
582 static inline int fb_prepare_extra_logos(struct fb_info *info,
583 unsigned int height,
584 unsigned int yres)
585 {
586 return height;
587 }
588
589 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
590 {
591 return y;
592 }
593
594 #endif /* CONFIG_FB_LOGO_EXTRA */
595
596
597 int fb_prepare_logo(struct fb_info *info, int rotate)
598 {
599 int depth = fb_get_color_depth(&info->var, &info->fix);
600 unsigned int yres;
601
602 memset(&fb_logo, 0, sizeof(struct logo_data));
603
604 if (info->flags & FBINFO_MISC_TILEBLITTING ||
605 info->fbops->owner)
606 return 0;
607
608 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
609 depth = info->var.blue.length;
610 if (info->var.red.length < depth)
611 depth = info->var.red.length;
612 if (info->var.green.length < depth)
613 depth = info->var.green.length;
614 }
615
616 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
617 /* assume console colormap */
618 depth = 4;
619 }
620
621 /* Return if no suitable logo was found */
622 fb_logo.logo = fb_find_logo(depth);
623
624 if (!fb_logo.logo) {
625 return 0;
626 }
627
628 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
629 yres = info->var.yres;
630 else
631 yres = info->var.xres;
632
633 if (fb_logo.logo->height > yres) {
634 fb_logo.logo = NULL;
635 return 0;
636 }
637
638 /* What depth we asked for might be different from what we get */
639 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
640 fb_logo.depth = 8;
641 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
642 fb_logo.depth = 4;
643 else
644 fb_logo.depth = 1;
645
646
647 if (fb_logo.depth > 4 && depth > 4) {
648 switch (info->fix.visual) {
649 case FB_VISUAL_TRUECOLOR:
650 fb_logo.needs_truepalette = 1;
651 break;
652 case FB_VISUAL_DIRECTCOLOR:
653 fb_logo.needs_directpalette = 1;
654 fb_logo.needs_cmapreset = 1;
655 break;
656 case FB_VISUAL_PSEUDOCOLOR:
657 fb_logo.needs_cmapreset = 1;
658 break;
659 }
660 }
661
662 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
663 }
664
665 int fb_show_logo(struct fb_info *info, int rotate)
666 {
667 int y;
668
669 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
670 num_online_cpus());
671 y = fb_show_extra_logos(info, y, rotate);
672
673 return y;
674 }
675 #else
676 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
677 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
678 #endif /* CONFIG_LOGO */
679 EXPORT_SYMBOL(fb_prepare_logo);
680 EXPORT_SYMBOL(fb_show_logo);
681
682 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
683 {
684 mutex_lock(&registration_lock);
685 return (*pos < FB_MAX) ? pos : NULL;
686 }
687
688 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
689 {
690 (*pos)++;
691 return (*pos < FB_MAX) ? pos : NULL;
692 }
693
694 static void fb_seq_stop(struct seq_file *m, void *v)
695 {
696 mutex_unlock(&registration_lock);
697 }
698
699 static int fb_seq_show(struct seq_file *m, void *v)
700 {
701 int i = *(loff_t *)v;
702 struct fb_info *fi = registered_fb[i];
703
704 if (fi)
705 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
706 return 0;
707 }
708
709 static const struct seq_operations proc_fb_seq_ops = {
710 .start = fb_seq_start,
711 .next = fb_seq_next,
712 .stop = fb_seq_stop,
713 .show = fb_seq_show,
714 };
715
716 static int proc_fb_open(struct inode *inode, struct file *file)
717 {
718 return seq_open(file, &proc_fb_seq_ops);
719 }
720
721 static const struct file_operations fb_proc_fops = {
722 .owner = THIS_MODULE,
723 .open = proc_fb_open,
724 .read = seq_read,
725 .llseek = seq_lseek,
726 .release = seq_release,
727 };
728
729 /*
730 * We hold a reference to the fb_info in file->private_data,
731 * but if the current registered fb has changed, we don't
732 * actually want to use it.
733 *
734 * So look up the fb_info using the inode minor number,
735 * and just verify it against the reference we have.
736 */
737 static struct fb_info *file_fb_info(struct file *file)
738 {
739 struct inode *inode = file_inode(file);
740 int fbidx = iminor(inode);
741 struct fb_info *info = registered_fb[fbidx];
742
743 if (info != file->private_data)
744 info = NULL;
745 return info;
746 }
747
748 static ssize_t
749 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
750 {
751 unsigned long p = *ppos;
752 struct fb_info *info = file_fb_info(file);
753 u8 *buffer, *dst;
754 u8 __iomem *src;
755 int c, cnt = 0, err = 0;
756 unsigned long total_size;
757
758 if (!info || ! info->screen_base)
759 return -ENODEV;
760
761 if (info->state != FBINFO_STATE_RUNNING)
762 return -EPERM;
763
764 if (info->fbops->fb_read)
765 return info->fbops->fb_read(info, buf, count, ppos);
766
767 total_size = info->screen_size;
768
769 if (total_size == 0)
770 total_size = info->fix.smem_len;
771
772 if (p >= total_size)
773 return 0;
774
775 if (count >= total_size)
776 count = total_size;
777
778 if (count + p > total_size)
779 count = total_size - p;
780
781 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
782 GFP_KERNEL);
783 if (!buffer)
784 return -ENOMEM;
785
786 src = (u8 __iomem *) (info->screen_base + p);
787
788 if (info->fbops->fb_sync)
789 info->fbops->fb_sync(info);
790
791 while (count) {
792 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
793 dst = buffer;
794 fb_memcpy_fromfb(dst, src, c);
795 dst += c;
796 src += c;
797
798 if (copy_to_user(buf, buffer, c)) {
799 err = -EFAULT;
800 break;
801 }
802 *ppos += c;
803 buf += c;
804 cnt += c;
805 count -= c;
806 }
807
808 kfree(buffer);
809
810 return (err) ? err : cnt;
811 }
812
813 static ssize_t
814 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
815 {
816 unsigned long p = *ppos;
817 struct fb_info *info = file_fb_info(file);
818 u8 *buffer, *src;
819 u8 __iomem *dst;
820 int c, cnt = 0, err = 0;
821 unsigned long total_size;
822
823 if (!info || !info->screen_base)
824 return -ENODEV;
825
826 if (info->state != FBINFO_STATE_RUNNING)
827 return -EPERM;
828
829 if (info->fbops->fb_write)
830 return info->fbops->fb_write(info, buf, count, ppos);
831
832 total_size = info->screen_size;
833
834 if (total_size == 0)
835 total_size = info->fix.smem_len;
836
837 if (p > total_size)
838 return -EFBIG;
839
840 if (count > total_size) {
841 err = -EFBIG;
842 count = total_size;
843 }
844
845 if (count + p > total_size) {
846 if (!err)
847 err = -ENOSPC;
848
849 count = total_size - p;
850 }
851
852 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
853 GFP_KERNEL);
854 if (!buffer)
855 return -ENOMEM;
856
857 dst = (u8 __iomem *) (info->screen_base + p);
858
859 if (info->fbops->fb_sync)
860 info->fbops->fb_sync(info);
861
862 while (count) {
863 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
864 src = buffer;
865
866 if (copy_from_user(src, buf, c)) {
867 err = -EFAULT;
868 break;
869 }
870
871 fb_memcpy_tofb(dst, src, c);
872 dst += c;
873 src += c;
874 *ppos += c;
875 buf += c;
876 cnt += c;
877 count -= c;
878 }
879
880 kfree(buffer);
881
882 return (cnt) ? cnt : err;
883 }
884
885 int
886 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
887 {
888 struct fb_fix_screeninfo *fix = &info->fix;
889 unsigned int yres = info->var.yres;
890 int err = 0;
891
892 if (var->yoffset > 0) {
893 if (var->vmode & FB_VMODE_YWRAP) {
894 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
895 err = -EINVAL;
896 else
897 yres = 0;
898 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
899 err = -EINVAL;
900 }
901
902 if (var->xoffset > 0 && (!fix->xpanstep ||
903 (var->xoffset % fix->xpanstep)))
904 err = -EINVAL;
905
906 if (err || !info->fbops->fb_pan_display ||
907 var->yoffset > info->var.yres_virtual - yres ||
908 var->xoffset > info->var.xres_virtual - info->var.xres)
909 return -EINVAL;
910
911 if ((err = info->fbops->fb_pan_display(var, info)))
912 return err;
913 info->var.xoffset = var->xoffset;
914 info->var.yoffset = var->yoffset;
915 if (var->vmode & FB_VMODE_YWRAP)
916 info->var.vmode |= FB_VMODE_YWRAP;
917 else
918 info->var.vmode &= ~FB_VMODE_YWRAP;
919 return 0;
920 }
921 EXPORT_SYMBOL(fb_pan_display);
922
923 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
924 u32 activate)
925 {
926 struct fb_event event;
927 struct fb_blit_caps caps, fbcaps;
928 int err = 0;
929
930 memset(&caps, 0, sizeof(caps));
931 memset(&fbcaps, 0, sizeof(fbcaps));
932 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
933 event.info = info;
934 event.data = &caps;
935 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
936 info->fbops->fb_get_caps(info, &fbcaps, var);
937
938 if (((fbcaps.x ^ caps.x) & caps.x) ||
939 ((fbcaps.y ^ caps.y) & caps.y) ||
940 (fbcaps.len < caps.len))
941 err = -EINVAL;
942
943 return err;
944 }
945
946 int
947 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
948 {
949 int flags = info->flags;
950 int ret = 0;
951
952 if (var->activate & FB_ACTIVATE_INV_MODE) {
953 struct fb_videomode mode1, mode2;
954
955 fb_var_to_videomode(&mode1, var);
956 fb_var_to_videomode(&mode2, &info->var);
957 /* make sure we don't delete the videomode of current var */
958 ret = fb_mode_is_equal(&mode1, &mode2);
959
960 if (!ret) {
961 struct fb_event event;
962
963 event.info = info;
964 event.data = &mode1;
965 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
966 }
967
968 if (!ret)
969 fb_delete_videomode(&mode1, &info->modelist);
970
971
972 ret = (ret) ? -EINVAL : 0;
973 goto done;
974 }
975
976 if ((var->activate & FB_ACTIVATE_FORCE) ||
977 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
978 u32 activate = var->activate;
979
980 /* When using FOURCC mode, make sure the red, green, blue and
981 * transp fields are set to 0.
982 */
983 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
984 var->grayscale > 1) {
985 if (var->red.offset || var->green.offset ||
986 var->blue.offset || var->transp.offset ||
987 var->red.length || var->green.length ||
988 var->blue.length || var->transp.length ||
989 var->red.msb_right || var->green.msb_right ||
990 var->blue.msb_right || var->transp.msb_right)
991 return -EINVAL;
992 }
993
994 if (!info->fbops->fb_check_var) {
995 *var = info->var;
996 goto done;
997 }
998
999 ret = info->fbops->fb_check_var(var, info);
1000
1001 if (ret)
1002 goto done;
1003
1004 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1005 struct fb_var_screeninfo old_var;
1006 struct fb_videomode mode;
1007
1008 if (info->fbops->fb_get_caps) {
1009 ret = fb_check_caps(info, var, activate);
1010
1011 if (ret)
1012 goto done;
1013 }
1014
1015 old_var = info->var;
1016 info->var = *var;
1017
1018 if (info->fbops->fb_set_par) {
1019 ret = info->fbops->fb_set_par(info);
1020
1021 if (ret) {
1022 info->var = old_var;
1023 printk(KERN_WARNING "detected "
1024 "fb_set_par error, "
1025 "error code: %d\n", ret);
1026 goto done;
1027 }
1028 }
1029
1030 fb_pan_display(info, &info->var);
1031 fb_set_cmap(&info->cmap, info);
1032 fb_var_to_videomode(&mode, &info->var);
1033
1034 if (info->modelist.prev && info->modelist.next &&
1035 !list_empty(&info->modelist))
1036 ret = fb_add_videomode(&mode, &info->modelist);
1037
1038 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1039 struct fb_event event;
1040 int evnt = (activate & FB_ACTIVATE_ALL) ?
1041 FB_EVENT_MODE_CHANGE_ALL :
1042 FB_EVENT_MODE_CHANGE;
1043
1044 info->flags &= ~FBINFO_MISC_USEREVENT;
1045 event.info = info;
1046 event.data = &mode;
1047 fb_notifier_call_chain(evnt, &event);
1048 }
1049 }
1050 }
1051
1052 done:
1053 return ret;
1054 }
1055 EXPORT_SYMBOL(fb_set_var);
1056
1057 int
1058 fb_blank(struct fb_info *info, int blank)
1059 {
1060 struct fb_event event;
1061 int ret = -EINVAL, early_ret;
1062
1063 if (blank > FB_BLANK_POWERDOWN)
1064 blank = FB_BLANK_POWERDOWN;
1065
1066 event.info = info;
1067 event.data = &blank;
1068
1069 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1070
1071 if (info->fbops->fb_blank)
1072 ret = info->fbops->fb_blank(blank, info);
1073
1074 if (!ret)
1075 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1076 else {
1077 /*
1078 * if fb_blank is failed then revert effects of
1079 * the early blank event.
1080 */
1081 if (!early_ret)
1082 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1083 }
1084
1085 return ret;
1086 }
1087 EXPORT_SYMBOL(fb_blank);
1088
1089 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1090 unsigned long arg)
1091 {
1092 struct fb_ops *fb;
1093 struct fb_var_screeninfo var;
1094 struct fb_fix_screeninfo fix;
1095 struct fb_con2fbmap con2fb;
1096 struct fb_cmap cmap_from;
1097 struct fb_cmap_user cmap;
1098 struct fb_event event;
1099 void __user *argp = (void __user *)arg;
1100 long ret = 0;
1101
1102 switch (cmd) {
1103 case FBIOGET_VSCREENINFO:
1104 if (!lock_fb_info(info))
1105 return -ENODEV;
1106 var = info->var;
1107 unlock_fb_info(info);
1108
1109 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1110 break;
1111 case FBIOPUT_VSCREENINFO:
1112 if (copy_from_user(&var, argp, sizeof(var)))
1113 return -EFAULT;
1114 console_lock();
1115 if (!lock_fb_info(info)) {
1116 console_unlock();
1117 return -ENODEV;
1118 }
1119 info->flags |= FBINFO_MISC_USEREVENT;
1120 ret = fb_set_var(info, &var);
1121 info->flags &= ~FBINFO_MISC_USEREVENT;
1122 unlock_fb_info(info);
1123 console_unlock();
1124 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1125 ret = -EFAULT;
1126 break;
1127 case FBIOGET_FSCREENINFO:
1128 if (!lock_fb_info(info))
1129 return -ENODEV;
1130 fix = info->fix;
1131 unlock_fb_info(info);
1132
1133 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1134 break;
1135 case FBIOPUTCMAP:
1136 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1137 return -EFAULT;
1138 ret = fb_set_user_cmap(&cmap, info);
1139 break;
1140 case FBIOGETCMAP:
1141 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1142 return -EFAULT;
1143 if (!lock_fb_info(info))
1144 return -ENODEV;
1145 cmap_from = info->cmap;
1146 unlock_fb_info(info);
1147 ret = fb_cmap_to_user(&cmap_from, &cmap);
1148 break;
1149 case FBIOPAN_DISPLAY:
1150 if (copy_from_user(&var, argp, sizeof(var)))
1151 return -EFAULT;
1152 console_lock();
1153 if (!lock_fb_info(info)) {
1154 console_unlock();
1155 return -ENODEV;
1156 }
1157 ret = fb_pan_display(info, &var);
1158 unlock_fb_info(info);
1159 console_unlock();
1160 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1161 return -EFAULT;
1162 break;
1163 case FBIO_CURSOR:
1164 ret = -EINVAL;
1165 break;
1166 case FBIOGET_CON2FBMAP:
1167 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1168 return -EFAULT;
1169 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1170 return -EINVAL;
1171 con2fb.framebuffer = -1;
1172 event.data = &con2fb;
1173 if (!lock_fb_info(info))
1174 return -ENODEV;
1175 event.info = info;
1176 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1177 unlock_fb_info(info);
1178 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1179 break;
1180 case FBIOPUT_CON2FBMAP:
1181 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1182 return -EFAULT;
1183 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1184 return -EINVAL;
1185 if (con2fb.framebuffer >= FB_MAX)
1186 return -EINVAL;
1187 if (!registered_fb[con2fb.framebuffer])
1188 request_module("fb%d", con2fb.framebuffer);
1189 if (!registered_fb[con2fb.framebuffer]) {
1190 ret = -EINVAL;
1191 break;
1192 }
1193 event.data = &con2fb;
1194 console_lock();
1195 if (!lock_fb_info(info)) {
1196 console_unlock();
1197 return -ENODEV;
1198 }
1199 event.info = info;
1200 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1201 unlock_fb_info(info);
1202 console_unlock();
1203 break;
1204 case FBIOBLANK:
1205 console_lock();
1206 if (!lock_fb_info(info)) {
1207 console_unlock();
1208 return -ENODEV;
1209 }
1210 info->flags |= FBINFO_MISC_USEREVENT;
1211 ret = fb_blank(info, arg);
1212 info->flags &= ~FBINFO_MISC_USEREVENT;
1213 unlock_fb_info(info);
1214 console_unlock();
1215 break;
1216 default:
1217 if (!lock_fb_info(info))
1218 return -ENODEV;
1219 fb = info->fbops;
1220 if (fb->fb_ioctl)
1221 ret = fb->fb_ioctl(info, cmd, arg);
1222 else
1223 ret = -ENOTTY;
1224 unlock_fb_info(info);
1225 }
1226 return ret;
1227 }
1228
1229 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1230 {
1231 struct fb_info *info = file_fb_info(file);
1232
1233 if (!info)
1234 return -ENODEV;
1235 return do_fb_ioctl(info, cmd, arg);
1236 }
1237
1238 #ifdef CONFIG_COMPAT
1239 struct fb_fix_screeninfo32 {
1240 char id[16];
1241 compat_caddr_t smem_start;
1242 u32 smem_len;
1243 u32 type;
1244 u32 type_aux;
1245 u32 visual;
1246 u16 xpanstep;
1247 u16 ypanstep;
1248 u16 ywrapstep;
1249 u32 line_length;
1250 compat_caddr_t mmio_start;
1251 u32 mmio_len;
1252 u32 accel;
1253 u16 reserved[3];
1254 };
1255
1256 struct fb_cmap32 {
1257 u32 start;
1258 u32 len;
1259 compat_caddr_t red;
1260 compat_caddr_t green;
1261 compat_caddr_t blue;
1262 compat_caddr_t transp;
1263 };
1264
1265 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1266 unsigned long arg)
1267 {
1268 struct fb_cmap_user __user *cmap;
1269 struct fb_cmap32 __user *cmap32;
1270 __u32 data;
1271 int err;
1272
1273 cmap = compat_alloc_user_space(sizeof(*cmap));
1274 cmap32 = compat_ptr(arg);
1275
1276 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1277 return -EFAULT;
1278
1279 if (get_user(data, &cmap32->red) ||
1280 put_user(compat_ptr(data), &cmap->red) ||
1281 get_user(data, &cmap32->green) ||
1282 put_user(compat_ptr(data), &cmap->green) ||
1283 get_user(data, &cmap32->blue) ||
1284 put_user(compat_ptr(data), &cmap->blue) ||
1285 get_user(data, &cmap32->transp) ||
1286 put_user(compat_ptr(data), &cmap->transp))
1287 return -EFAULT;
1288
1289 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1290
1291 if (!err) {
1292 if (copy_in_user(&cmap32->start,
1293 &cmap->start,
1294 2 * sizeof(__u32)))
1295 err = -EFAULT;
1296 }
1297 return err;
1298 }
1299
1300 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1301 struct fb_fix_screeninfo32 __user *fix32)
1302 {
1303 __u32 data;
1304 int err;
1305
1306 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1307
1308 data = (__u32) (unsigned long) fix->smem_start;
1309 err |= put_user(data, &fix32->smem_start);
1310
1311 err |= put_user(fix->smem_len, &fix32->smem_len);
1312 err |= put_user(fix->type, &fix32->type);
1313 err |= put_user(fix->type_aux, &fix32->type_aux);
1314 err |= put_user(fix->visual, &fix32->visual);
1315 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1316 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1317 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1318 err |= put_user(fix->line_length, &fix32->line_length);
1319
1320 data = (__u32) (unsigned long) fix->mmio_start;
1321 err |= put_user(data, &fix32->mmio_start);
1322
1323 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1324 err |= put_user(fix->accel, &fix32->accel);
1325 err |= copy_to_user(fix32->reserved, fix->reserved,
1326 sizeof(fix->reserved));
1327
1328 if (err)
1329 return -EFAULT;
1330 return 0;
1331 }
1332
1333 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1334 unsigned long arg)
1335 {
1336 struct fb_fix_screeninfo fix;
1337
1338 if (!lock_fb_info(info))
1339 return -ENODEV;
1340 fix = info->fix;
1341 unlock_fb_info(info);
1342 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1343 }
1344
1345 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1346 unsigned long arg)
1347 {
1348 struct fb_info *info = file_fb_info(file);
1349 struct fb_ops *fb;
1350 long ret = -ENOIOCTLCMD;
1351
1352 if (!info)
1353 return -ENODEV;
1354 fb = info->fbops;
1355 switch(cmd) {
1356 case FBIOGET_VSCREENINFO:
1357 case FBIOPUT_VSCREENINFO:
1358 case FBIOPAN_DISPLAY:
1359 case FBIOGET_CON2FBMAP:
1360 case FBIOPUT_CON2FBMAP:
1361 arg = (unsigned long) compat_ptr(arg);
1362 case FBIOBLANK:
1363 ret = do_fb_ioctl(info, cmd, arg);
1364 break;
1365
1366 case FBIOGET_FSCREENINFO:
1367 ret = fb_get_fscreeninfo(info, cmd, arg);
1368 break;
1369
1370 case FBIOGETCMAP:
1371 case FBIOPUTCMAP:
1372 ret = fb_getput_cmap(info, cmd, arg);
1373 break;
1374
1375 default:
1376 if (fb->fb_compat_ioctl)
1377 ret = fb->fb_compat_ioctl(info, cmd, arg);
1378 break;
1379 }
1380 return ret;
1381 }
1382 #endif
1383
1384 static int
1385 fb_mmap(struct file *file, struct vm_area_struct * vma)
1386 {
1387 struct fb_info *info = file_fb_info(file);
1388 struct fb_ops *fb;
1389 unsigned long mmio_pgoff;
1390 unsigned long start;
1391 u32 len;
1392
1393 if (!info)
1394 return -ENODEV;
1395 fb = info->fbops;
1396 if (!fb)
1397 return -ENODEV;
1398 mutex_lock(&info->mm_lock);
1399 if (fb->fb_mmap) {
1400 int res;
1401
1402 /*
1403 * The framebuffer needs to be accessed decrypted, be sure
1404 * SME protection is removed ahead of the call
1405 */
1406 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1407 res = fb->fb_mmap(info, vma);
1408 mutex_unlock(&info->mm_lock);
1409 return res;
1410 }
1411
1412 /*
1413 * Ugh. This can be either the frame buffer mapping, or
1414 * if pgoff points past it, the mmio mapping.
1415 */
1416 start = info->fix.smem_start;
1417 len = info->fix.smem_len;
1418 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1419 if (vma->vm_pgoff >= mmio_pgoff) {
1420 if (info->var.accel_flags) {
1421 mutex_unlock(&info->mm_lock);
1422 return -EINVAL;
1423 }
1424
1425 vma->vm_pgoff -= mmio_pgoff;
1426 start = info->fix.mmio_start;
1427 len = info->fix.mmio_len;
1428 }
1429 mutex_unlock(&info->mm_lock);
1430
1431 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1432 /*
1433 * The framebuffer needs to be accessed decrypted, be sure
1434 * SME protection is removed
1435 */
1436 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1437 fb_pgprotect(file, vma, start);
1438
1439 return vm_iomap_memory(vma, start, len);
1440 }
1441
1442 static int
1443 fb_open(struct inode *inode, struct file *file)
1444 __acquires(&info->lock)
1445 __releases(&info->lock)
1446 {
1447 int fbidx = iminor(inode);
1448 struct fb_info *info;
1449 int res = 0;
1450
1451 info = get_fb_info(fbidx);
1452 if (!info) {
1453 request_module("fb%d", fbidx);
1454 info = get_fb_info(fbidx);
1455 if (!info)
1456 return -ENODEV;
1457 }
1458 if (IS_ERR(info))
1459 return PTR_ERR(info);
1460
1461 mutex_lock(&info->lock);
1462 if (!try_module_get(info->fbops->owner)) {
1463 res = -ENODEV;
1464 goto out;
1465 }
1466 file->private_data = info;
1467 if (info->fbops->fb_open) {
1468 res = info->fbops->fb_open(info,1);
1469 if (res)
1470 module_put(info->fbops->owner);
1471 }
1472 #ifdef CONFIG_FB_DEFERRED_IO
1473 if (info->fbdefio)
1474 fb_deferred_io_open(info, inode, file);
1475 #endif
1476 out:
1477 mutex_unlock(&info->lock);
1478 if (res)
1479 put_fb_info(info);
1480 return res;
1481 }
1482
1483 static int
1484 fb_release(struct inode *inode, struct file *file)
1485 __acquires(&info->lock)
1486 __releases(&info->lock)
1487 {
1488 struct fb_info * const info = file->private_data;
1489
1490 mutex_lock(&info->lock);
1491 if (info->fbops->fb_release)
1492 info->fbops->fb_release(info,1);
1493 module_put(info->fbops->owner);
1494 mutex_unlock(&info->lock);
1495 put_fb_info(info);
1496 return 0;
1497 }
1498
1499 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1500 unsigned long get_fb_unmapped_area(struct file *filp,
1501 unsigned long addr, unsigned long len,
1502 unsigned long pgoff, unsigned long flags)
1503 {
1504 struct fb_info * const info = filp->private_data;
1505 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1506
1507 if (pgoff > fb_size || len > fb_size - pgoff)
1508 return -EINVAL;
1509
1510 return (unsigned long)info->screen_base + pgoff;
1511 }
1512 #endif
1513
1514 static const struct file_operations fb_fops = {
1515 .owner = THIS_MODULE,
1516 .read = fb_read,
1517 .write = fb_write,
1518 .unlocked_ioctl = fb_ioctl,
1519 #ifdef CONFIG_COMPAT
1520 .compat_ioctl = fb_compat_ioctl,
1521 #endif
1522 .mmap = fb_mmap,
1523 .open = fb_open,
1524 .release = fb_release,
1525 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1526 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1527 !defined(CONFIG_MMU))
1528 .get_unmapped_area = get_fb_unmapped_area,
1529 #endif
1530 #ifdef CONFIG_FB_DEFERRED_IO
1531 .fsync = fb_deferred_io_fsync,
1532 #endif
1533 .llseek = default_llseek,
1534 };
1535
1536 struct class *fb_class;
1537 EXPORT_SYMBOL(fb_class);
1538
1539 static int fb_check_foreignness(struct fb_info *fi)
1540 {
1541 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1542
1543 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1544
1545 #ifdef __BIG_ENDIAN
1546 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1547 #else
1548 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1549 #endif /* __BIG_ENDIAN */
1550
1551 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1552 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1553 "support this framebuffer\n", fi->fix.id);
1554 return -ENOSYS;
1555 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1556 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1557 "support this framebuffer\n", fi->fix.id);
1558 return -ENOSYS;
1559 }
1560
1561 return 0;
1562 }
1563
1564 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1565 {
1566 /* is the generic aperture base the same as the HW one */
1567 if (gen->base == hw->base)
1568 return true;
1569 /* is the generic aperture base inside the hw base->hw base+size */
1570 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1571 return true;
1572 return false;
1573 }
1574
1575 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1576 struct apertures_struct *hwa)
1577 {
1578 int i, j;
1579 if (!hwa || !gena)
1580 return false;
1581
1582 for (i = 0; i < hwa->count; ++i) {
1583 struct aperture *h = &hwa->ranges[i];
1584 for (j = 0; j < gena->count; ++j) {
1585 struct aperture *g = &gena->ranges[j];
1586 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1587 (unsigned long long)g->base,
1588 (unsigned long long)g->size,
1589 (unsigned long long)h->base,
1590 (unsigned long long)h->size);
1591 if (apertures_overlap(g, h))
1592 return true;
1593 }
1594 }
1595
1596 return false;
1597 }
1598
1599 static int do_unregister_framebuffer(struct fb_info *fb_info);
1600
1601 #define VGA_FB_PHYS 0xA0000
1602 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1603 const char *name, bool primary)
1604 {
1605 int i, ret;
1606
1607 /* check all firmware fbs and kick off if the base addr overlaps */
1608 for (i = 0 ; i < FB_MAX; i++) {
1609 struct apertures_struct *gen_aper;
1610 if (!registered_fb[i])
1611 continue;
1612
1613 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1614 continue;
1615
1616 gen_aper = registered_fb[i]->apertures;
1617 if (fb_do_apertures_overlap(gen_aper, a) ||
1618 (primary && gen_aper && gen_aper->count &&
1619 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1620
1621 printk(KERN_INFO "fb: switching to %s from %s\n",
1622 name, registered_fb[i]->fix.id);
1623 ret = do_unregister_framebuffer(registered_fb[i]);
1624 if (ret)
1625 return ret;
1626 }
1627 }
1628
1629 return 0;
1630 }
1631
1632 static bool lockless_register_fb;
1633 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1634 MODULE_PARM_DESC(lockless_register_fb,
1635 "Lockless framebuffer registration for debugging [default=off]");
1636
1637 static int do_register_framebuffer(struct fb_info *fb_info)
1638 {
1639 int i, ret;
1640 struct fb_event event;
1641 struct fb_videomode mode;
1642
1643 if (fb_check_foreignness(fb_info))
1644 return -ENOSYS;
1645
1646 ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1647 fb_info->fix.id,
1648 fb_is_primary_device(fb_info));
1649 if (ret)
1650 return ret;
1651
1652 if (num_registered_fb == FB_MAX)
1653 return -ENXIO;
1654
1655 num_registered_fb++;
1656 for (i = 0 ; i < FB_MAX; i++)
1657 if (!registered_fb[i])
1658 break;
1659 fb_info->node = i;
1660 atomic_set(&fb_info->count, 1);
1661 mutex_init(&fb_info->lock);
1662 mutex_init(&fb_info->mm_lock);
1663
1664 fb_info->dev = device_create(fb_class, fb_info->device,
1665 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1666 if (IS_ERR(fb_info->dev)) {
1667 /* Not fatal */
1668 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1669 fb_info->dev = NULL;
1670 } else
1671 fb_init_device(fb_info);
1672
1673 if (fb_info->pixmap.addr == NULL) {
1674 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1675 if (fb_info->pixmap.addr) {
1676 fb_info->pixmap.size = FBPIXMAPSIZE;
1677 fb_info->pixmap.buf_align = 1;
1678 fb_info->pixmap.scan_align = 1;
1679 fb_info->pixmap.access_align = 32;
1680 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1681 }
1682 }
1683 fb_info->pixmap.offset = 0;
1684
1685 if (!fb_info->pixmap.blit_x)
1686 fb_info->pixmap.blit_x = ~(u32)0;
1687
1688 if (!fb_info->pixmap.blit_y)
1689 fb_info->pixmap.blit_y = ~(u32)0;
1690
1691 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1692 INIT_LIST_HEAD(&fb_info->modelist);
1693
1694 if (fb_info->skip_vt_switch)
1695 pm_vt_switch_required(fb_info->dev, false);
1696 else
1697 pm_vt_switch_required(fb_info->dev, true);
1698
1699 fb_var_to_videomode(&mode, &fb_info->var);
1700 fb_add_videomode(&mode, &fb_info->modelist);
1701 registered_fb[i] = fb_info;
1702
1703 event.info = fb_info;
1704 if (!lockless_register_fb)
1705 console_lock();
1706 if (!lock_fb_info(fb_info)) {
1707 if (!lockless_register_fb)
1708 console_unlock();
1709 return -ENODEV;
1710 }
1711
1712 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1713 unlock_fb_info(fb_info);
1714 if (!lockless_register_fb)
1715 console_unlock();
1716 return 0;
1717 }
1718
1719 static int do_unregister_framebuffer(struct fb_info *fb_info)
1720 {
1721 struct fb_event event;
1722 int i, ret = 0;
1723
1724 i = fb_info->node;
1725 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1726 return -EINVAL;
1727
1728 console_lock();
1729 if (!lock_fb_info(fb_info)) {
1730 console_unlock();
1731 return -ENODEV;
1732 }
1733
1734 event.info = fb_info;
1735 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1736 unlock_fb_info(fb_info);
1737 console_unlock();
1738
1739 if (ret)
1740 return -EINVAL;
1741
1742 pm_vt_switch_unregister(fb_info->dev);
1743
1744 unlink_framebuffer(fb_info);
1745 if (fb_info->pixmap.addr &&
1746 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1747 kfree(fb_info->pixmap.addr);
1748 fb_destroy_modelist(&fb_info->modelist);
1749 registered_fb[i] = NULL;
1750 num_registered_fb--;
1751 fb_cleanup_device(fb_info);
1752 event.info = fb_info;
1753 console_lock();
1754 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1755 console_unlock();
1756
1757 /* this may free fb info */
1758 put_fb_info(fb_info);
1759 return 0;
1760 }
1761
1762 int unlink_framebuffer(struct fb_info *fb_info)
1763 {
1764 int i;
1765
1766 i = fb_info->node;
1767 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1768 return -EINVAL;
1769
1770 if (fb_info->dev) {
1771 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1772 fb_info->dev = NULL;
1773 }
1774 return 0;
1775 }
1776 EXPORT_SYMBOL(unlink_framebuffer);
1777
1778 int remove_conflicting_framebuffers(struct apertures_struct *a,
1779 const char *name, bool primary)
1780 {
1781 int ret;
1782
1783 mutex_lock(&registration_lock);
1784 ret = do_remove_conflicting_framebuffers(a, name, primary);
1785 mutex_unlock(&registration_lock);
1786
1787 return ret;
1788 }
1789 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1790
1791 /**
1792 * register_framebuffer - registers a frame buffer device
1793 * @fb_info: frame buffer info structure
1794 *
1795 * Registers a frame buffer device @fb_info.
1796 *
1797 * Returns negative errno on error, or zero for success.
1798 *
1799 */
1800 int
1801 register_framebuffer(struct fb_info *fb_info)
1802 {
1803 int ret;
1804
1805 mutex_lock(&registration_lock);
1806 ret = do_register_framebuffer(fb_info);
1807 mutex_unlock(&registration_lock);
1808
1809 return ret;
1810 }
1811 EXPORT_SYMBOL(register_framebuffer);
1812
1813 /**
1814 * unregister_framebuffer - releases a frame buffer device
1815 * @fb_info: frame buffer info structure
1816 *
1817 * Unregisters a frame buffer device @fb_info.
1818 *
1819 * Returns negative errno on error, or zero for success.
1820 *
1821 * This function will also notify the framebuffer console
1822 * to release the driver.
1823 *
1824 * This is meant to be called within a driver's module_exit()
1825 * function. If this is called outside module_exit(), ensure
1826 * that the driver implements fb_open() and fb_release() to
1827 * check that no processes are using the device.
1828 */
1829 int
1830 unregister_framebuffer(struct fb_info *fb_info)
1831 {
1832 int ret;
1833
1834 mutex_lock(&registration_lock);
1835 ret = do_unregister_framebuffer(fb_info);
1836 mutex_unlock(&registration_lock);
1837
1838 return ret;
1839 }
1840 EXPORT_SYMBOL(unregister_framebuffer);
1841
1842 /**
1843 * fb_set_suspend - low level driver signals suspend
1844 * @info: framebuffer affected
1845 * @state: 0 = resuming, !=0 = suspending
1846 *
1847 * This is meant to be used by low level drivers to
1848 * signal suspend/resume to the core & clients.
1849 * It must be called with the console semaphore held
1850 */
1851 void fb_set_suspend(struct fb_info *info, int state)
1852 {
1853 struct fb_event event;
1854
1855 event.info = info;
1856 if (state) {
1857 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1858 info->state = FBINFO_STATE_SUSPENDED;
1859 } else {
1860 info->state = FBINFO_STATE_RUNNING;
1861 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1862 }
1863 }
1864 EXPORT_SYMBOL(fb_set_suspend);
1865
1866 /**
1867 * fbmem_init - init frame buffer subsystem
1868 *
1869 * Initialize the frame buffer subsystem.
1870 *
1871 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1872 *
1873 */
1874
1875 static int __init
1876 fbmem_init(void)
1877 {
1878 int ret;
1879
1880 if (!proc_create("fb", 0, NULL, &fb_proc_fops))
1881 return -ENOMEM;
1882
1883 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1884 if (ret) {
1885 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1886 goto err_chrdev;
1887 }
1888
1889 fb_class = class_create(THIS_MODULE, "graphics");
1890 if (IS_ERR(fb_class)) {
1891 ret = PTR_ERR(fb_class);
1892 pr_warn("Unable to create fb class; errno = %d\n", ret);
1893 fb_class = NULL;
1894 goto err_class;
1895 }
1896
1897 fb_console_init();
1898
1899 return 0;
1900
1901 err_class:
1902 unregister_chrdev(FB_MAJOR, "fb");
1903 err_chrdev:
1904 remove_proc_entry("fb", NULL);
1905 return ret;
1906 }
1907
1908 #ifdef MODULE
1909 module_init(fbmem_init);
1910 static void __exit
1911 fbmem_exit(void)
1912 {
1913 fb_console_exit();
1914
1915 remove_proc_entry("fb", NULL);
1916 class_destroy(fb_class);
1917 unregister_chrdev(FB_MAJOR, "fb");
1918 }
1919
1920 module_exit(fbmem_exit);
1921 MODULE_LICENSE("GPL");
1922 MODULE_DESCRIPTION("Framebuffer base");
1923 #else
1924 subsys_initcall(fbmem_init);
1925 #endif
1926
1927 int fb_new_modelist(struct fb_info *info)
1928 {
1929 struct fb_event event;
1930 struct fb_var_screeninfo var = info->var;
1931 struct list_head *pos, *n;
1932 struct fb_modelist *modelist;
1933 struct fb_videomode *m, mode;
1934 int err = 1;
1935
1936 list_for_each_safe(pos, n, &info->modelist) {
1937 modelist = list_entry(pos, struct fb_modelist, list);
1938 m = &modelist->mode;
1939 fb_videomode_to_var(&var, m);
1940 var.activate = FB_ACTIVATE_TEST;
1941 err = fb_set_var(info, &var);
1942 fb_var_to_videomode(&mode, &var);
1943 if (err || !fb_mode_is_equal(m, &mode)) {
1944 list_del(pos);
1945 kfree(pos);
1946 }
1947 }
1948
1949 err = 1;
1950
1951 if (!list_empty(&info->modelist)) {
1952 event.info = info;
1953 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1954 }
1955
1956 return err;
1957 }
1958
1959 MODULE_LICENSE("GPL");
Linux with added FPC-III support