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x86, UV: Fix for nodes with memory and no cpus
[linux/fpc-iii.git] / drivers / video / fbmem.c
blob2ac32e6b5953bb981e8bc57f9516584bc868d1c9
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/smp_lock.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/mman.h>
25 #include <linux/vt.h>
26 #include <linux/init.h>
27 #include <linux/linux_logo.h>
28 #include <linux/proc_fs.h>
29 #include <linux/seq_file.h>
30 #include <linux/console.h>
31 #include <linux/kmod.h>
32 #include <linux/err.h>
33 #include <linux/device.h>
34 #include <linux/efi.h>
35 #include <linux/fb.h>
36
37 #include <asm/fb.h>
38
39
40 /*
41 * Frame buffer device initialization and setup routines
42 */
43
44 #define FBPIXMAPSIZE (1024 * 8)
45
46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
47 int num_registered_fb __read_mostly;
48
49 int lock_fb_info(struct fb_info *info)
50 {
51 mutex_lock(&info->lock);
52 if (!info->fbops) {
53 mutex_unlock(&info->lock);
54 return 0;
55 }
56 return 1;
57 }
58 EXPORT_SYMBOL(lock_fb_info);
59
60 /*
61 * Helpers
62 */
63
64 int fb_get_color_depth(struct fb_var_screeninfo *var,
65 struct fb_fix_screeninfo *fix)
66 {
67 int depth = 0;
68
69 if (fix->visual == FB_VISUAL_MONO01 ||
70 fix->visual == FB_VISUAL_MONO10)
71 depth = 1;
72 else {
73 if (var->green.length == var->blue.length &&
74 var->green.length == var->red.length &&
75 var->green.offset == var->blue.offset &&
76 var->green.offset == var->red.offset)
77 depth = var->green.length;
78 else
79 depth = var->green.length + var->red.length +
80 var->blue.length;
81 }
82
83 return depth;
84 }
85 EXPORT_SYMBOL(fb_get_color_depth);
86
87 /*
88 * Data padding functions.
89 */
90 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
91 {
92 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
93 }
94 EXPORT_SYMBOL(fb_pad_aligned_buffer);
95
96 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
97 u32 shift_high, u32 shift_low, u32 mod)
98 {
99 u8 mask = (u8) (0xfff << shift_high), tmp;
100 int i, j;
101
102 for (i = height; i--; ) {
103 for (j = 0; j < idx; j++) {
104 tmp = dst[j];
105 tmp &= mask;
106 tmp |= *src >> shift_low;
107 dst[j] = tmp;
108 tmp = *src << shift_high;
109 dst[j+1] = tmp;
110 src++;
111 }
112 tmp = dst[idx];
113 tmp &= mask;
114 tmp |= *src >> shift_low;
115 dst[idx] = tmp;
116 if (shift_high < mod) {
117 tmp = *src << shift_high;
118 dst[idx+1] = tmp;
119 }
120 src++;
121 dst += d_pitch;
122 }
123 }
124 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
125
126 /*
127 * we need to lock this section since fb_cursor
128 * may use fb_imageblit()
129 */
130 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
131 {
132 u32 align = buf->buf_align - 1, offset;
133 char *addr = buf->addr;
134
135 /* If IO mapped, we need to sync before access, no sharing of
136 * the pixmap is done
137 */
138 if (buf->flags & FB_PIXMAP_IO) {
139 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
140 info->fbops->fb_sync(info);
141 return addr;
142 }
143
144 /* See if we fit in the remaining pixmap space */
145 offset = buf->offset + align;
146 offset &= ~align;
147 if (offset + size > buf->size) {
148 /* We do not fit. In order to be able to re-use the buffer,
149 * we must ensure no asynchronous DMA'ing or whatever operation
150 * is in progress, we sync for that.
151 */
152 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
153 info->fbops->fb_sync(info);
154 offset = 0;
155 }
156 buf->offset = offset + size;
157 addr += offset;
158
159 return addr;
160 }
161
162 #ifdef CONFIG_LOGO
163
164 static inline unsigned safe_shift(unsigned d, int n)
165 {
166 return n < 0 ? d >> -n : d << n;
167 }
168
169 static void fb_set_logocmap(struct fb_info *info,
170 const struct linux_logo *logo)
171 {
172 struct fb_cmap palette_cmap;
173 u16 palette_green[16];
174 u16 palette_blue[16];
175 u16 palette_red[16];
176 int i, j, n;
177 const unsigned char *clut = logo->clut;
178
179 palette_cmap.start = 0;
180 palette_cmap.len = 16;
181 palette_cmap.red = palette_red;
182 palette_cmap.green = palette_green;
183 palette_cmap.blue = palette_blue;
184 palette_cmap.transp = NULL;
185
186 for (i = 0; i < logo->clutsize; i += n) {
187 n = logo->clutsize - i;
188 /* palette_cmap provides space for only 16 colors at once */
189 if (n > 16)
190 n = 16;
191 palette_cmap.start = 32 + i;
192 palette_cmap.len = n;
193 for (j = 0; j < n; ++j) {
194 palette_cmap.red[j] = clut[0] << 8 | clut[0];
195 palette_cmap.green[j] = clut[1] << 8 | clut[1];
196 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
197 clut += 3;
198 }
199 fb_set_cmap(&palette_cmap, info);
200 }
201 }
202
203 static void fb_set_logo_truepalette(struct fb_info *info,
204 const struct linux_logo *logo,
205 u32 *palette)
206 {
207 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
208 unsigned char redmask, greenmask, bluemask;
209 int redshift, greenshift, blueshift;
210 int i;
211 const unsigned char *clut = logo->clut;
212
213 /*
214 * We have to create a temporary palette since console palette is only
215 * 16 colors long.
216 */
217 /* Bug: Doesn't obey msb_right ... (who needs that?) */
218 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
219 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
220 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
221 redshift = info->var.red.offset - (8 - info->var.red.length);
222 greenshift = info->var.green.offset - (8 - info->var.green.length);
223 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
224
225 for ( i = 0; i < logo->clutsize; i++) {
226 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
227 safe_shift((clut[1] & greenmask), greenshift) |
228 safe_shift((clut[2] & bluemask), blueshift));
229 clut += 3;
230 }
231 }
232
233 static void fb_set_logo_directpalette(struct fb_info *info,
234 const struct linux_logo *logo,
235 u32 *palette)
236 {
237 int redshift, greenshift, blueshift;
238 int i;
239
240 redshift = info->var.red.offset;
241 greenshift = info->var.green.offset;
242 blueshift = info->var.blue.offset;
243
244 for (i = 32; i < 32 + logo->clutsize; i++)
245 palette[i] = i << redshift | i << greenshift | i << blueshift;
246 }
247
248 static void fb_set_logo(struct fb_info *info,
249 const struct linux_logo *logo, u8 *dst,
250 int depth)
251 {
252 int i, j, k;
253 const u8 *src = logo->data;
254 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
255 u8 fg = 1, d;
256
257 switch (fb_get_color_depth(&info->var, &info->fix)) {
258 case 1:
259 fg = 1;
260 break;
261 case 2:
262 fg = 3;
263 break;
264 default:
265 fg = 7;
266 break;
267 }
268
269 if (info->fix.visual == FB_VISUAL_MONO01 ||
270 info->fix.visual == FB_VISUAL_MONO10)
271 fg = ~((u8) (0xfff << info->var.green.length));
272
273 switch (depth) {
274 case 4:
275 for (i = 0; i < logo->height; i++)
276 for (j = 0; j < logo->width; src++) {
277 *dst++ = *src >> 4;
278 j++;
279 if (j < logo->width) {
280 *dst++ = *src & 0x0f;
281 j++;
282 }
283 }
284 break;
285 case 1:
286 for (i = 0; i < logo->height; i++) {
287 for (j = 0; j < logo->width; src++) {
288 d = *src ^ xor;
289 for (k = 7; k >= 0; k--) {
290 *dst++ = ((d >> k) & 1) ? fg : 0;
291 j++;
292 }
293 }
294 }
295 break;
296 }
297 }
298
299 /*
300 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
301 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
302 * the visual format and color depth of the framebuffer, the DAC, the
303 * pseudo_palette, and the logo data will be adjusted accordingly.
304 *
305 * Case 1 - linux_logo_clut224:
306 * Color exceeds the number of console colors (16), thus we set the hardware DAC
307 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
308 *
309 * For visuals that require color info from the pseudo_palette, we also construct
310 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
311 * will be set.
312 *
313 * Case 2 - linux_logo_vga16:
314 * The number of colors just matches the console colors, thus there is no need
315 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
316 * each byte contains color information for two pixels (upper and lower nibble).
317 * To be consistent with fb_imageblit() usage, we therefore separate the two
318 * nibbles into separate bytes. The "depth" flag will be set to 4.
319 *
320 * Case 3 - linux_logo_mono:
321 * This is similar with Case 2. Each byte contains information for 8 pixels.
322 * We isolate each bit and expand each into a byte. The "depth" flag will
323 * be set to 1.
324 */
325 static struct logo_data {
326 int depth;
327 int needs_directpalette;
328 int needs_truepalette;
329 int needs_cmapreset;
330 const struct linux_logo *logo;
331 } fb_logo __read_mostly;
332
333 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
334 {
335 u32 size = width * height, i;
336
337 out += size - 1;
338
339 for (i = size; i--; )
340 *out-- = *in++;
341 }
342
343 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
344 {
345 int i, j, h = height - 1;
346
347 for (i = 0; i < height; i++)
348 for (j = 0; j < width; j++)
349 out[height * j + h - i] = *in++;
350 }
351
352 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
353 {
354 int i, j, w = width - 1;
355
356 for (i = 0; i < height; i++)
357 for (j = 0; j < width; j++)
358 out[height * (w - j) + i] = *in++;
359 }
360
361 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
362 struct fb_image *image, int rotate)
363 {
364 u32 tmp;
365
366 if (rotate == FB_ROTATE_UD) {
367 fb_rotate_logo_ud(image->data, dst, image->width,
368 image->height);
369 image->dx = info->var.xres - image->width - image->dx;
370 image->dy = info->var.yres - image->height - image->dy;
371 } else if (rotate == FB_ROTATE_CW) {
372 fb_rotate_logo_cw(image->data, dst, image->width,
373 image->height);
374 tmp = image->width;
375 image->width = image->height;
376 image->height = tmp;
377 tmp = image->dy;
378 image->dy = image->dx;
379 image->dx = info->var.xres - image->width - tmp;
380 } else if (rotate == FB_ROTATE_CCW) {
381 fb_rotate_logo_ccw(image->data, dst, image->width,
382 image->height);
383 tmp = image->width;
384 image->width = image->height;
385 image->height = tmp;
386 tmp = image->dx;
387 image->dx = image->dy;
388 image->dy = info->var.yres - image->height - tmp;
389 }
390
391 image->data = dst;
392 }
393
394 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
395 int rotate, unsigned int num)
396 {
397 unsigned int x;
398
399 if (rotate == FB_ROTATE_UR) {
400 for (x = 0;
401 x < num && image->dx + image->width <= info->var.xres;
402 x++) {
403 info->fbops->fb_imageblit(info, image);
404 image->dx += image->width + 8;
405 }
406 } else if (rotate == FB_ROTATE_UD) {
407 for (x = 0; x < num && image->dx >= 0; x++) {
408 info->fbops->fb_imageblit(info, image);
409 image->dx -= image->width + 8;
410 }
411 } else if (rotate == FB_ROTATE_CW) {
412 for (x = 0;
413 x < num && image->dy + image->height <= info->var.yres;
414 x++) {
415 info->fbops->fb_imageblit(info, image);
416 image->dy += image->height + 8;
417 }
418 } else if (rotate == FB_ROTATE_CCW) {
419 for (x = 0; x < num && image->dy >= 0; x++) {
420 info->fbops->fb_imageblit(info, image);
421 image->dy -= image->height + 8;
422 }
423 }
424 }
425
426 static int fb_show_logo_line(struct fb_info *info, int rotate,
427 const struct linux_logo *logo, int y,
428 unsigned int n)
429 {
430 u32 *palette = NULL, *saved_pseudo_palette = NULL;
431 unsigned char *logo_new = NULL, *logo_rotate = NULL;
432 struct fb_image image;
433
434 /* Return if the frame buffer is not mapped or suspended */
435 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
436 info->flags & FBINFO_MODULE)
437 return 0;
438
439 image.depth = 8;
440 image.data = logo->data;
441
442 if (fb_logo.needs_cmapreset)
443 fb_set_logocmap(info, logo);
444
445 if (fb_logo.needs_truepalette ||
446 fb_logo.needs_directpalette) {
447 palette = kmalloc(256 * 4, GFP_KERNEL);
448 if (palette == NULL)
449 return 0;
450
451 if (fb_logo.needs_truepalette)
452 fb_set_logo_truepalette(info, logo, palette);
453 else
454 fb_set_logo_directpalette(info, logo, palette);
455
456 saved_pseudo_palette = info->pseudo_palette;
457 info->pseudo_palette = palette;
458 }
459
460 if (fb_logo.depth <= 4) {
461 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
462 if (logo_new == NULL) {
463 kfree(palette);
464 if (saved_pseudo_palette)
465 info->pseudo_palette = saved_pseudo_palette;
466 return 0;
467 }
468 image.data = logo_new;
469 fb_set_logo(info, logo, logo_new, fb_logo.depth);
470 }
471
472 image.dx = 0;
473 image.dy = y;
474 image.width = logo->width;
475 image.height = logo->height;
476
477 if (rotate) {
478 logo_rotate = kmalloc(logo->width *
479 logo->height, GFP_KERNEL);
480 if (logo_rotate)
481 fb_rotate_logo(info, logo_rotate, &image, rotate);
482 }
483
484 fb_do_show_logo(info, &image, rotate, n);
485
486 kfree(palette);
487 if (saved_pseudo_palette != NULL)
488 info->pseudo_palette = saved_pseudo_palette;
489 kfree(logo_new);
490 kfree(logo_rotate);
491 return logo->height;
492 }
493
494
495 #ifdef CONFIG_FB_LOGO_EXTRA
496
497 #define FB_LOGO_EX_NUM_MAX 10
498 static struct logo_data_extra {
499 const struct linux_logo *logo;
500 unsigned int n;
501 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
502 static unsigned int fb_logo_ex_num;
503
504 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
505 {
506 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
507 return;
508
509 fb_logo_ex[fb_logo_ex_num].logo = logo;
510 fb_logo_ex[fb_logo_ex_num].n = n;
511 fb_logo_ex_num++;
512 }
513
514 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
515 unsigned int yres)
516 {
517 unsigned int i;
518
519 /* FIXME: logo_ex supports only truecolor fb. */
520 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
521 fb_logo_ex_num = 0;
522
523 for (i = 0; i < fb_logo_ex_num; i++) {
524 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
525 fb_logo_ex[i].logo = NULL;
526 continue;
527 }
528 height += fb_logo_ex[i].logo->height;
529 if (height > yres) {
530 height -= fb_logo_ex[i].logo->height;
531 fb_logo_ex_num = i;
532 break;
533 }
534 }
535 return height;
536 }
537
538 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
539 {
540 unsigned int i;
541
542 for (i = 0; i < fb_logo_ex_num; i++)
543 y += fb_show_logo_line(info, rotate,
544 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
545
546 return y;
547 }
548
549 #else /* !CONFIG_FB_LOGO_EXTRA */
550
551 static inline int fb_prepare_extra_logos(struct fb_info *info,
552 unsigned int height,
553 unsigned int yres)
554 {
555 return height;
556 }
557
558 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
559 {
560 return y;
561 }
562
563 #endif /* CONFIG_FB_LOGO_EXTRA */
564
565
566 int fb_prepare_logo(struct fb_info *info, int rotate)
567 {
568 int depth = fb_get_color_depth(&info->var, &info->fix);
569 unsigned int yres;
570
571 memset(&fb_logo, 0, sizeof(struct logo_data));
572
573 if (info->flags & FBINFO_MISC_TILEBLITTING ||
574 info->flags & FBINFO_MODULE)
575 return 0;
576
577 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
578 depth = info->var.blue.length;
579 if (info->var.red.length < depth)
580 depth = info->var.red.length;
581 if (info->var.green.length < depth)
582 depth = info->var.green.length;
583 }
584
585 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
586 /* assume console colormap */
587 depth = 4;
588 }
589
590 /* Return if no suitable logo was found */
591 fb_logo.logo = fb_find_logo(depth);
592
593 if (!fb_logo.logo) {
594 return 0;
595 }
596
597 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
598 yres = info->var.yres;
599 else
600 yres = info->var.xres;
601
602 if (fb_logo.logo->height > yres) {
603 fb_logo.logo = NULL;
604 return 0;
605 }
606
607 /* What depth we asked for might be different from what we get */
608 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
609 fb_logo.depth = 8;
610 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
611 fb_logo.depth = 4;
612 else
613 fb_logo.depth = 1;
614
615
616 if (fb_logo.depth > 4 && depth > 4) {
617 switch (info->fix.visual) {
618 case FB_VISUAL_TRUECOLOR:
619 fb_logo.needs_truepalette = 1;
620 break;
621 case FB_VISUAL_DIRECTCOLOR:
622 fb_logo.needs_directpalette = 1;
623 fb_logo.needs_cmapreset = 1;
624 break;
625 case FB_VISUAL_PSEUDOCOLOR:
626 fb_logo.needs_cmapreset = 1;
627 break;
628 }
629 }
630
631 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
632 }
633
634 int fb_show_logo(struct fb_info *info, int rotate)
635 {
636 int y;
637
638 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
639 num_online_cpus());
640 y = fb_show_extra_logos(info, y, rotate);
641
642 return y;
643 }
644 #else
645 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
646 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
647 #endif /* CONFIG_LOGO */
648
649 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
650 {
651 return (*pos < FB_MAX) ? pos : NULL;
652 }
653
654 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
655 {
656 (*pos)++;
657 return (*pos < FB_MAX) ? pos : NULL;
658 }
659
660 static void fb_seq_stop(struct seq_file *m, void *v)
661 {
662 }
663
664 static int fb_seq_show(struct seq_file *m, void *v)
665 {
666 int i = *(loff_t *)v;
667 struct fb_info *fi = registered_fb[i];
668
669 if (fi)
670 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
671 return 0;
672 }
673
674 static const struct seq_operations proc_fb_seq_ops = {
675 .start = fb_seq_start,
676 .next = fb_seq_next,
677 .stop = fb_seq_stop,
678 .show = fb_seq_show,
679 };
680
681 static int proc_fb_open(struct inode *inode, struct file *file)
682 {
683 return seq_open(file, &proc_fb_seq_ops);
684 }
685
686 static const struct file_operations fb_proc_fops = {
687 .owner = THIS_MODULE,
688 .open = proc_fb_open,
689 .read = seq_read,
690 .llseek = seq_lseek,
691 .release = seq_release,
692 };
693
694 static ssize_t
695 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
696 {
697 unsigned long p = *ppos;
698 struct inode *inode = file->f_path.dentry->d_inode;
699 int fbidx = iminor(inode);
700 struct fb_info *info = registered_fb[fbidx];
701 u32 *buffer, *dst;
702 u32 __iomem *src;
703 int c, i, cnt = 0, err = 0;
704 unsigned long total_size;
705
706 if (!info || ! info->screen_base)
707 return -ENODEV;
708
709 if (info->state != FBINFO_STATE_RUNNING)
710 return -EPERM;
711
712 if (info->fbops->fb_read)
713 return info->fbops->fb_read(info, buf, count, ppos);
714
715 total_size = info->screen_size;
716
717 if (total_size == 0)
718 total_size = info->fix.smem_len;
719
720 if (p >= total_size)
721 return 0;
722
723 if (count >= total_size)
724 count = total_size;
725
726 if (count + p > total_size)
727 count = total_size - p;
728
729 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
730 GFP_KERNEL);
731 if (!buffer)
732 return -ENOMEM;
733
734 src = (u32 __iomem *) (info->screen_base + p);
735
736 if (info->fbops->fb_sync)
737 info->fbops->fb_sync(info);
738
739 while (count) {
740 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
741 dst = buffer;
742 for (i = c >> 2; i--; )
743 *dst++ = fb_readl(src++);
744 if (c & 3) {
745 u8 *dst8 = (u8 *) dst;
746 u8 __iomem *src8 = (u8 __iomem *) src;
747
748 for (i = c & 3; i--;)
749 *dst8++ = fb_readb(src8++);
750
751 src = (u32 __iomem *) src8;
752 }
753
754 if (copy_to_user(buf, buffer, c)) {
755 err = -EFAULT;
756 break;
757 }
758 *ppos += c;
759 buf += c;
760 cnt += c;
761 count -= c;
762 }
763
764 kfree(buffer);
765
766 return (err) ? err : cnt;
767 }
768
769 static ssize_t
770 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
771 {
772 unsigned long p = *ppos;
773 struct inode *inode = file->f_path.dentry->d_inode;
774 int fbidx = iminor(inode);
775 struct fb_info *info = registered_fb[fbidx];
776 u32 *buffer, *src;
777 u32 __iomem *dst;
778 int c, i, cnt = 0, err = 0;
779 unsigned long total_size;
780
781 if (!info || !info->screen_base)
782 return -ENODEV;
783
784 if (info->state != FBINFO_STATE_RUNNING)
785 return -EPERM;
786
787 if (info->fbops->fb_write)
788 return info->fbops->fb_write(info, buf, count, ppos);
789
790 total_size = info->screen_size;
791
792 if (total_size == 0)
793 total_size = info->fix.smem_len;
794
795 if (p > total_size)
796 return -EFBIG;
797
798 if (count > total_size) {
799 err = -EFBIG;
800 count = total_size;
801 }
802
803 if (count + p > total_size) {
804 if (!err)
805 err = -ENOSPC;
806
807 count = total_size - p;
808 }
809
810 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
811 GFP_KERNEL);
812 if (!buffer)
813 return -ENOMEM;
814
815 dst = (u32 __iomem *) (info->screen_base + p);
816
817 if (info->fbops->fb_sync)
818 info->fbops->fb_sync(info);
819
820 while (count) {
821 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
822 src = buffer;
823
824 if (copy_from_user(src, buf, c)) {
825 err = -EFAULT;
826 break;
827 }
828
829 for (i = c >> 2; i--; )
830 fb_writel(*src++, dst++);
831
832 if (c & 3) {
833 u8 *src8 = (u8 *) src;
834 u8 __iomem *dst8 = (u8 __iomem *) dst;
835
836 for (i = c & 3; i--; )
837 fb_writeb(*src8++, dst8++);
838
839 dst = (u32 __iomem *) dst8;
840 }
841
842 *ppos += c;
843 buf += c;
844 cnt += c;
845 count -= c;
846 }
847
848 kfree(buffer);
849
850 return (cnt) ? cnt : err;
851 }
852
853 int
854 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
855 {
856 struct fb_fix_screeninfo *fix = &info->fix;
857 unsigned int yres = info->var.yres;
858 int err = 0;
859
860 if (var->yoffset > 0) {
861 if (var->vmode & FB_VMODE_YWRAP) {
862 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
863 err = -EINVAL;
864 else
865 yres = 0;
866 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
867 err = -EINVAL;
868 }
869
870 if (var->xoffset > 0 && (!fix->xpanstep ||
871 (var->xoffset % fix->xpanstep)))
872 err = -EINVAL;
873
874 if (err || !info->fbops->fb_pan_display ||
875 var->yoffset + yres > info->var.yres_virtual ||
876 var->xoffset + info->var.xres > info->var.xres_virtual)
877 return -EINVAL;
878
879 if ((err = info->fbops->fb_pan_display(var, info)))
880 return err;
881 info->var.xoffset = var->xoffset;
882 info->var.yoffset = var->yoffset;
883 if (var->vmode & FB_VMODE_YWRAP)
884 info->var.vmode |= FB_VMODE_YWRAP;
885 else
886 info->var.vmode &= ~FB_VMODE_YWRAP;
887 return 0;
888 }
889
890 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
891 u32 activate)
892 {
893 struct fb_event event;
894 struct fb_blit_caps caps, fbcaps;
895 int err = 0;
896
897 memset(&caps, 0, sizeof(caps));
898 memset(&fbcaps, 0, sizeof(fbcaps));
899 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
900 event.info = info;
901 event.data = &caps;
902 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
903 info->fbops->fb_get_caps(info, &fbcaps, var);
904
905 if (((fbcaps.x ^ caps.x) & caps.x) ||
906 ((fbcaps.y ^ caps.y) & caps.y) ||
907 (fbcaps.len < caps.len))
908 err = -EINVAL;
909
910 return err;
911 }
912
913 int
914 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
915 {
916 int flags = info->flags;
917 int ret = 0;
918
919 if (var->activate & FB_ACTIVATE_INV_MODE) {
920 struct fb_videomode mode1, mode2;
921
922 fb_var_to_videomode(&mode1, var);
923 fb_var_to_videomode(&mode2, &info->var);
924 /* make sure we don't delete the videomode of current var */
925 ret = fb_mode_is_equal(&mode1, &mode2);
926
927 if (!ret) {
928 struct fb_event event;
929
930 event.info = info;
931 event.data = &mode1;
932 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
933 }
934
935 if (!ret)
936 fb_delete_videomode(&mode1, &info->modelist);
937
938
939 ret = (ret) ? -EINVAL : 0;
940 goto done;
941 }
942
943 if ((var->activate & FB_ACTIVATE_FORCE) ||
944 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
945 u32 activate = var->activate;
946
947 if (!info->fbops->fb_check_var) {
948 *var = info->var;
949 goto done;
950 }
951
952 ret = info->fbops->fb_check_var(var, info);
953
954 if (ret)
955 goto done;
956
957 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
958 struct fb_videomode mode;
959
960 if (info->fbops->fb_get_caps) {
961 ret = fb_check_caps(info, var, activate);
962
963 if (ret)
964 goto done;
965 }
966
967 info->var = *var;
968
969 if (info->fbops->fb_set_par)
970 info->fbops->fb_set_par(info);
971
972 fb_pan_display(info, &info->var);
973 fb_set_cmap(&info->cmap, info);
974 fb_var_to_videomode(&mode, &info->var);
975
976 if (info->modelist.prev && info->modelist.next &&
977 !list_empty(&info->modelist))
978 ret = fb_add_videomode(&mode, &info->modelist);
979
980 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
981 struct fb_event event;
982 int evnt = (activate & FB_ACTIVATE_ALL) ?
983 FB_EVENT_MODE_CHANGE_ALL :
984 FB_EVENT_MODE_CHANGE;
985
986 info->flags &= ~FBINFO_MISC_USEREVENT;
987 event.info = info;
988 event.data = &mode;
989 fb_notifier_call_chain(evnt, &event);
990 }
991 }
992 }
993
994 done:
995 return ret;
996 }
997
998 int
999 fb_blank(struct fb_info *info, int blank)
1000 {
1001 int ret = -EINVAL;
1002
1003 if (blank > FB_BLANK_POWERDOWN)
1004 blank = FB_BLANK_POWERDOWN;
1005
1006 if (info->fbops->fb_blank)
1007 ret = info->fbops->fb_blank(blank, info);
1008
1009 if (!ret) {
1010 struct fb_event event;
1011
1012 event.info = info;
1013 event.data = &blank;
1014 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1015 }
1016
1017 return ret;
1018 }
1019
1020 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1021 unsigned long arg)
1022 {
1023 struct fb_ops *fb;
1024 struct fb_var_screeninfo var;
1025 struct fb_fix_screeninfo fix;
1026 struct fb_con2fbmap con2fb;
1027 struct fb_cmap cmap_from;
1028 struct fb_cmap_user cmap;
1029 struct fb_event event;
1030 void __user *argp = (void __user *)arg;
1031 long ret = 0;
1032
1033 switch (cmd) {
1034 case FBIOGET_VSCREENINFO:
1035 if (!lock_fb_info(info))
1036 return -ENODEV;
1037 var = info->var;
1038 unlock_fb_info(info);
1039
1040 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1041 break;
1042 case FBIOPUT_VSCREENINFO:
1043 if (copy_from_user(&var, argp, sizeof(var)))
1044 return -EFAULT;
1045 if (!lock_fb_info(info))
1046 return -ENODEV;
1047 acquire_console_sem();
1048 info->flags |= FBINFO_MISC_USEREVENT;
1049 ret = fb_set_var(info, &var);
1050 info->flags &= ~FBINFO_MISC_USEREVENT;
1051 release_console_sem();
1052 unlock_fb_info(info);
1053 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1054 ret = -EFAULT;
1055 break;
1056 case FBIOGET_FSCREENINFO:
1057 if (!lock_fb_info(info))
1058 return -ENODEV;
1059 fix = info->fix;
1060 unlock_fb_info(info);
1061
1062 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1063 break;
1064 case FBIOPUTCMAP:
1065 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1066 return -EFAULT;
1067 ret = fb_set_user_cmap(&cmap, info);
1068 break;
1069 case FBIOGETCMAP:
1070 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1071 return -EFAULT;
1072 if (!lock_fb_info(info))
1073 return -ENODEV;
1074 cmap_from = info->cmap;
1075 unlock_fb_info(info);
1076 ret = fb_cmap_to_user(&cmap_from, &cmap);
1077 break;
1078 case FBIOPAN_DISPLAY:
1079 if (copy_from_user(&var, argp, sizeof(var)))
1080 return -EFAULT;
1081 if (!lock_fb_info(info))
1082 return -ENODEV;
1083 acquire_console_sem();
1084 ret = fb_pan_display(info, &var);
1085 release_console_sem();
1086 unlock_fb_info(info);
1087 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1088 return -EFAULT;
1089 break;
1090 case FBIO_CURSOR:
1091 ret = -EINVAL;
1092 break;
1093 case FBIOGET_CON2FBMAP:
1094 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1095 return -EFAULT;
1096 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1097 return -EINVAL;
1098 con2fb.framebuffer = -1;
1099 event.data = &con2fb;
1100 event.info = info;
1101 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1102 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1103 break;
1104 case FBIOPUT_CON2FBMAP:
1105 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1106 return -EFAULT;
1107 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1108 return -EINVAL;
1109 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1110 return -EINVAL;
1111 if (!registered_fb[con2fb.framebuffer])
1112 request_module("fb%d", con2fb.framebuffer);
1113 if (!registered_fb[con2fb.framebuffer]) {
1114 ret = -EINVAL;
1115 break;
1116 }
1117 event.data = &con2fb;
1118 event.info = info;
1119 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1120 break;
1121 case FBIOBLANK:
1122 if (!lock_fb_info(info))
1123 return -ENODEV;
1124 acquire_console_sem();
1125 info->flags |= FBINFO_MISC_USEREVENT;
1126 ret = fb_blank(info, arg);
1127 info->flags &= ~FBINFO_MISC_USEREVENT;
1128 release_console_sem();
1129 unlock_fb_info(info);
1130 break;
1131 default:
1132 if (!lock_fb_info(info))
1133 return -ENODEV;
1134 fb = info->fbops;
1135 if (fb->fb_ioctl)
1136 ret = fb->fb_ioctl(info, cmd, arg);
1137 else
1138 ret = -ENOTTY;
1139 unlock_fb_info(info);
1140 }
1141 return ret;
1142 }
1143
1144 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1145 {
1146 struct inode *inode = file->f_path.dentry->d_inode;
1147 int fbidx = iminor(inode);
1148 struct fb_info *info = registered_fb[fbidx];
1149
1150 return do_fb_ioctl(info, cmd, arg);
1151 }
1152
1153 #ifdef CONFIG_COMPAT
1154 struct fb_fix_screeninfo32 {
1155 char id[16];
1156 compat_caddr_t smem_start;
1157 u32 smem_len;
1158 u32 type;
1159 u32 type_aux;
1160 u32 visual;
1161 u16 xpanstep;
1162 u16 ypanstep;
1163 u16 ywrapstep;
1164 u32 line_length;
1165 compat_caddr_t mmio_start;
1166 u32 mmio_len;
1167 u32 accel;
1168 u16 reserved[3];
1169 };
1170
1171 struct fb_cmap32 {
1172 u32 start;
1173 u32 len;
1174 compat_caddr_t red;
1175 compat_caddr_t green;
1176 compat_caddr_t blue;
1177 compat_caddr_t transp;
1178 };
1179
1180 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1181 unsigned long arg)
1182 {
1183 struct fb_cmap_user __user *cmap;
1184 struct fb_cmap32 __user *cmap32;
1185 __u32 data;
1186 int err;
1187
1188 cmap = compat_alloc_user_space(sizeof(*cmap));
1189 cmap32 = compat_ptr(arg);
1190
1191 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1192 return -EFAULT;
1193
1194 if (get_user(data, &cmap32->red) ||
1195 put_user(compat_ptr(data), &cmap->red) ||
1196 get_user(data, &cmap32->green) ||
1197 put_user(compat_ptr(data), &cmap->green) ||
1198 get_user(data, &cmap32->blue) ||
1199 put_user(compat_ptr(data), &cmap->blue) ||
1200 get_user(data, &cmap32->transp) ||
1201 put_user(compat_ptr(data), &cmap->transp))
1202 return -EFAULT;
1203
1204 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1205
1206 if (!err) {
1207 if (copy_in_user(&cmap32->start,
1208 &cmap->start,
1209 2 * sizeof(__u32)))
1210 err = -EFAULT;
1211 }
1212 return err;
1213 }
1214
1215 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1216 struct fb_fix_screeninfo32 __user *fix32)
1217 {
1218 __u32 data;
1219 int err;
1220
1221 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1222
1223 data = (__u32) (unsigned long) fix->smem_start;
1224 err |= put_user(data, &fix32->smem_start);
1225
1226 err |= put_user(fix->smem_len, &fix32->smem_len);
1227 err |= put_user(fix->type, &fix32->type);
1228 err |= put_user(fix->type_aux, &fix32->type_aux);
1229 err |= put_user(fix->visual, &fix32->visual);
1230 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1231 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1232 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1233 err |= put_user(fix->line_length, &fix32->line_length);
1234
1235 data = (__u32) (unsigned long) fix->mmio_start;
1236 err |= put_user(data, &fix32->mmio_start);
1237
1238 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1239 err |= put_user(fix->accel, &fix32->accel);
1240 err |= copy_to_user(fix32->reserved, fix->reserved,
1241 sizeof(fix->reserved));
1242
1243 return err;
1244 }
1245
1246 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1247 unsigned long arg)
1248 {
1249 mm_segment_t old_fs;
1250 struct fb_fix_screeninfo fix;
1251 struct fb_fix_screeninfo32 __user *fix32;
1252 int err;
1253
1254 fix32 = compat_ptr(arg);
1255
1256 old_fs = get_fs();
1257 set_fs(KERNEL_DS);
1258 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1259 set_fs(old_fs);
1260
1261 if (!err)
1262 err = do_fscreeninfo_to_user(&fix, fix32);
1263
1264 return err;
1265 }
1266
1267 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1268 unsigned long arg)
1269 {
1270 struct inode *inode = file->f_path.dentry->d_inode;
1271 int fbidx = iminor(inode);
1272 struct fb_info *info = registered_fb[fbidx];
1273 struct fb_ops *fb = info->fbops;
1274 long ret = -ENOIOCTLCMD;
1275
1276 switch(cmd) {
1277 case FBIOGET_VSCREENINFO:
1278 case FBIOPUT_VSCREENINFO:
1279 case FBIOPAN_DISPLAY:
1280 case FBIOGET_CON2FBMAP:
1281 case FBIOPUT_CON2FBMAP:
1282 arg = (unsigned long) compat_ptr(arg);
1283 case FBIOBLANK:
1284 ret = do_fb_ioctl(info, cmd, arg);
1285 break;
1286
1287 case FBIOGET_FSCREENINFO:
1288 ret = fb_get_fscreeninfo(info, cmd, arg);
1289 break;
1290
1291 case FBIOGETCMAP:
1292 case FBIOPUTCMAP:
1293 ret = fb_getput_cmap(info, cmd, arg);
1294 break;
1295
1296 default:
1297 if (fb->fb_compat_ioctl)
1298 ret = fb->fb_compat_ioctl(info, cmd, arg);
1299 break;
1300 }
1301 return ret;
1302 }
1303 #endif
1304
1305 static int
1306 fb_mmap(struct file *file, struct vm_area_struct * vma)
1307 __acquires(&info->lock)
1308 __releases(&info->lock)
1309 {
1310 int fbidx = iminor(file->f_path.dentry->d_inode);
1311 struct fb_info *info = registered_fb[fbidx];
1312 struct fb_ops *fb = info->fbops;
1313 unsigned long off;
1314 unsigned long start;
1315 u32 len;
1316
1317 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1318 return -EINVAL;
1319 off = vma->vm_pgoff << PAGE_SHIFT;
1320 if (!fb)
1321 return -ENODEV;
1322 if (fb->fb_mmap) {
1323 int res;
1324 mutex_lock(&info->lock);
1325 res = fb->fb_mmap(info, vma);
1326 mutex_unlock(&info->lock);
1327 return res;
1328 }
1329
1330 mutex_lock(&info->lock);
1331
1332 /* frame buffer memory */
1333 start = info->fix.smem_start;
1334 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1335 if (off >= len) {
1336 /* memory mapped io */
1337 off -= len;
1338 if (info->var.accel_flags) {
1339 mutex_unlock(&info->lock);
1340 return -EINVAL;
1341 }
1342 start = info->fix.mmio_start;
1343 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1344 }
1345 mutex_unlock(&info->lock);
1346 start &= PAGE_MASK;
1347 if ((vma->vm_end - vma->vm_start + off) > len)
1348 return -EINVAL;
1349 off += start;
1350 vma->vm_pgoff = off >> PAGE_SHIFT;
1351 /* This is an IO map - tell maydump to skip this VMA */
1352 vma->vm_flags |= VM_IO | VM_RESERVED;
1353 fb_pgprotect(file, vma, off);
1354 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1355 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1356 return -EAGAIN;
1357 return 0;
1358 }
1359
1360 static int
1361 fb_open(struct inode *inode, struct file *file)
1362 __acquires(&info->lock)
1363 __releases(&info->lock)
1364 {
1365 int fbidx = iminor(inode);
1366 struct fb_info *info;
1367 int res = 0;
1368
1369 if (fbidx >= FB_MAX)
1370 return -ENODEV;
1371 info = registered_fb[fbidx];
1372 if (!info)
1373 request_module("fb%d", fbidx);
1374 info = registered_fb[fbidx];
1375 if (!info)
1376 return -ENODEV;
1377 mutex_lock(&info->lock);
1378 if (!try_module_get(info->fbops->owner)) {
1379 res = -ENODEV;
1380 goto out;
1381 }
1382 file->private_data = info;
1383 if (info->fbops->fb_open) {
1384 res = info->fbops->fb_open(info,1);
1385 if (res)
1386 module_put(info->fbops->owner);
1387 }
1388 #ifdef CONFIG_FB_DEFERRED_IO
1389 if (info->fbdefio)
1390 fb_deferred_io_open(info, inode, file);
1391 #endif
1392 out:
1393 mutex_unlock(&info->lock);
1394 return res;
1395 }
1396
1397 static int
1398 fb_release(struct inode *inode, struct file *file)
1399 __acquires(&info->lock)
1400 __releases(&info->lock)
1401 {
1402 struct fb_info * const info = file->private_data;
1403
1404 mutex_lock(&info->lock);
1405 if (info->fbops->fb_release)
1406 info->fbops->fb_release(info,1);
1407 module_put(info->fbops->owner);
1408 mutex_unlock(&info->lock);
1409 return 0;
1410 }
1411
1412 static const struct file_operations fb_fops = {
1413 .owner = THIS_MODULE,
1414 .read = fb_read,
1415 .write = fb_write,
1416 .unlocked_ioctl = fb_ioctl,
1417 #ifdef CONFIG_COMPAT
1418 .compat_ioctl = fb_compat_ioctl,
1419 #endif
1420 .mmap = fb_mmap,
1421 .open = fb_open,
1422 .release = fb_release,
1423 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1424 .get_unmapped_area = get_fb_unmapped_area,
1425 #endif
1426 #ifdef CONFIG_FB_DEFERRED_IO
1427 .fsync = fb_deferred_io_fsync,
1428 #endif
1429 };
1430
1431 struct class *fb_class;
1432 EXPORT_SYMBOL(fb_class);
1433
1434 static int fb_check_foreignness(struct fb_info *fi)
1435 {
1436 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1437
1438 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1439
1440 #ifdef __BIG_ENDIAN
1441 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1442 #else
1443 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1444 #endif /* __BIG_ENDIAN */
1445
1446 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1447 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1448 "support this framebuffer\n", fi->fix.id);
1449 return -ENOSYS;
1450 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1451 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1452 "support this framebuffer\n", fi->fix.id);
1453 return -ENOSYS;
1454 }
1455
1456 return 0;
1457 }
1458
1459 /**
1460 * register_framebuffer - registers a frame buffer device
1461 * @fb_info: frame buffer info structure
1462 *
1463 * Registers a frame buffer device @fb_info.
1464 *
1465 * Returns negative errno on error, or zero for success.
1466 *
1467 */
1468
1469 int
1470 register_framebuffer(struct fb_info *fb_info)
1471 {
1472 int i;
1473 struct fb_event event;
1474 struct fb_videomode mode;
1475
1476 if (num_registered_fb == FB_MAX)
1477 return -ENXIO;
1478
1479 if (fb_check_foreignness(fb_info))
1480 return -ENOSYS;
1481
1482 num_registered_fb++;
1483 for (i = 0 ; i < FB_MAX; i++)
1484 if (!registered_fb[i])
1485 break;
1486 fb_info->node = i;
1487 mutex_init(&fb_info->lock);
1488
1489 fb_info->dev = device_create(fb_class, fb_info->device,
1490 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1491 if (IS_ERR(fb_info->dev)) {
1492 /* Not fatal */
1493 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1494 fb_info->dev = NULL;
1495 } else
1496 fb_init_device(fb_info);
1497
1498 if (fb_info->pixmap.addr == NULL) {
1499 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1500 if (fb_info->pixmap.addr) {
1501 fb_info->pixmap.size = FBPIXMAPSIZE;
1502 fb_info->pixmap.buf_align = 1;
1503 fb_info->pixmap.scan_align = 1;
1504 fb_info->pixmap.access_align = 32;
1505 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1506 }
1507 }
1508 fb_info->pixmap.offset = 0;
1509
1510 if (!fb_info->pixmap.blit_x)
1511 fb_info->pixmap.blit_x = ~(u32)0;
1512
1513 if (!fb_info->pixmap.blit_y)
1514 fb_info->pixmap.blit_y = ~(u32)0;
1515
1516 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1517 INIT_LIST_HEAD(&fb_info->modelist);
1518
1519 fb_var_to_videomode(&mode, &fb_info->var);
1520 fb_add_videomode(&mode, &fb_info->modelist);
1521 registered_fb[i] = fb_info;
1522
1523 event.info = fb_info;
1524 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1525 return 0;
1526 }
1527
1528
1529 /**
1530 * unregister_framebuffer - releases a frame buffer device
1531 * @fb_info: frame buffer info structure
1532 *
1533 * Unregisters a frame buffer device @fb_info.
1534 *
1535 * Returns negative errno on error, or zero for success.
1536 *
1537 * This function will also notify the framebuffer console
1538 * to release the driver.
1539 *
1540 * This is meant to be called within a driver's module_exit()
1541 * function. If this is called outside module_exit(), ensure
1542 * that the driver implements fb_open() and fb_release() to
1543 * check that no processes are using the device.
1544 */
1545
1546 int
1547 unregister_framebuffer(struct fb_info *fb_info)
1548 {
1549 struct fb_event event;
1550 int i, ret = 0;
1551
1552 i = fb_info->node;
1553 if (!registered_fb[i]) {
1554 ret = -EINVAL;
1555 goto done;
1556 }
1557
1558 event.info = fb_info;
1559 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1560
1561 if (ret) {
1562 ret = -EINVAL;
1563 goto done;
1564 }
1565
1566 if (fb_info->pixmap.addr &&
1567 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1568 kfree(fb_info->pixmap.addr);
1569 fb_destroy_modelist(&fb_info->modelist);
1570 registered_fb[i]=NULL;
1571 num_registered_fb--;
1572 fb_cleanup_device(fb_info);
1573 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1574 event.info = fb_info;
1575 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1576 done:
1577 return ret;
1578 }
1579
1580 /**
1581 * fb_set_suspend - low level driver signals suspend
1582 * @info: framebuffer affected
1583 * @state: 0 = resuming, !=0 = suspending
1584 *
1585 * This is meant to be used by low level drivers to
1586 * signal suspend/resume to the core & clients.
1587 * It must be called with the console semaphore held
1588 */
1589 void fb_set_suspend(struct fb_info *info, int state)
1590 {
1591 struct fb_event event;
1592
1593 event.info = info;
1594 if (state) {
1595 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1596 info->state = FBINFO_STATE_SUSPENDED;
1597 } else {
1598 info->state = FBINFO_STATE_RUNNING;
1599 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1600 }
1601 }
1602
1603 /**
1604 * fbmem_init - init frame buffer subsystem
1605 *
1606 * Initialize the frame buffer subsystem.
1607 *
1608 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1609 *
1610 */
1611
1612 static int __init
1613 fbmem_init(void)
1614 {
1615 proc_create("fb", 0, NULL, &fb_proc_fops);
1616
1617 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1618 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1619
1620 fb_class = class_create(THIS_MODULE, "graphics");
1621 if (IS_ERR(fb_class)) {
1622 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1623 fb_class = NULL;
1624 }
1625 return 0;
1626 }
1627
1628 #ifdef MODULE
1629 module_init(fbmem_init);
1630 static void __exit
1631 fbmem_exit(void)
1632 {
1633 remove_proc_entry("fb", NULL);
1634 class_destroy(fb_class);
1635 unregister_chrdev(FB_MAJOR, "fb");
1636 }
1637
1638 module_exit(fbmem_exit);
1639 MODULE_LICENSE("GPL");
1640 MODULE_DESCRIPTION("Framebuffer base");
1641 #else
1642 subsys_initcall(fbmem_init);
1643 #endif
1644
1645 int fb_new_modelist(struct fb_info *info)
1646 {
1647 struct fb_event event;
1648 struct fb_var_screeninfo var = info->var;
1649 struct list_head *pos, *n;
1650 struct fb_modelist *modelist;
1651 struct fb_videomode *m, mode;
1652 int err = 1;
1653
1654 list_for_each_safe(pos, n, &info->modelist) {
1655 modelist = list_entry(pos, struct fb_modelist, list);
1656 m = &modelist->mode;
1657 fb_videomode_to_var(&var, m);
1658 var.activate = FB_ACTIVATE_TEST;
1659 err = fb_set_var(info, &var);
1660 fb_var_to_videomode(&mode, &var);
1661 if (err || !fb_mode_is_equal(m, &mode)) {
1662 list_del(pos);
1663 kfree(pos);
1664 }
1665 }
1666
1667 err = 1;
1668
1669 if (!list_empty(&info->modelist)) {
1670 event.info = info;
1671 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1672 }
1673
1674 return err;
1675 }
1676
1677 static char *video_options[FB_MAX] __read_mostly;
1678 static int ofonly __read_mostly;
1679
1680 /**
1681 * fb_get_options - get kernel boot parameters
1682 * @name: framebuffer name as it would appear in
1683 * the boot parameter line
1684 * (video=<name>:<options>)
1685 * @option: the option will be stored here
1686 *
1687 * NOTE: Needed to maintain backwards compatibility
1688 */
1689 int fb_get_options(char *name, char **option)
1690 {
1691 char *opt, *options = NULL;
1692 int opt_len, retval = 0;
1693 int name_len = strlen(name), i;
1694
1695 if (name_len && ofonly && strncmp(name, "offb", 4))
1696 retval = 1;
1697
1698 if (name_len && !retval) {
1699 for (i = 0; i < FB_MAX; i++) {
1700 if (video_options[i] == NULL)
1701 continue;
1702 opt_len = strlen(video_options[i]);
1703 if (!opt_len)
1704 continue;
1705 opt = video_options[i];
1706 if (!strncmp(name, opt, name_len) &&
1707 opt[name_len] == ':')
1708 options = opt + name_len + 1;
1709 }
1710 }
1711 if (options && !strncmp(options, "off", 3))
1712 retval = 1;
1713
1714 if (option)
1715 *option = options;
1716
1717 return retval;
1718 }
1719
1720 #ifndef MODULE
1721 /**
1722 * video_setup - process command line options
1723 * @options: string of options
1724 *
1725 * Process command line options for frame buffer subsystem.
1726 *
1727 * NOTE: This function is a __setup and __init function.
1728 * It only stores the options. Drivers have to call
1729 * fb_get_options() as necessary.
1730 *
1731 * Returns zero.
1732 *
1733 */
1734 static int __init video_setup(char *options)
1735 {
1736 int i, global = 0;
1737
1738 if (!options || !*options)
1739 global = 1;
1740
1741 if (!global && !strncmp(options, "ofonly", 6)) {
1742 ofonly = 1;
1743 global = 1;
1744 }
1745
1746 if (!global && !strstr(options, "fb:")) {
1747 fb_mode_option = options;
1748 global = 1;
1749 }
1750
1751 if (!global) {
1752 for (i = 0; i < FB_MAX; i++) {
1753 if (video_options[i] == NULL) {
1754 video_options[i] = options;
1755 break;
1756 }
1757
1758 }
1759 }
1760
1761 return 1;
1762 }
1763 __setup("video=", video_setup);
1764 #endif
1765
1766 /*
1767 * Visible symbols for modules
1768 */
1769
1770 EXPORT_SYMBOL(register_framebuffer);
1771 EXPORT_SYMBOL(unregister_framebuffer);
1772 EXPORT_SYMBOL(num_registered_fb);
1773 EXPORT_SYMBOL(registered_fb);
1774 EXPORT_SYMBOL(fb_show_logo);
1775 EXPORT_SYMBOL(fb_set_var);
1776 EXPORT_SYMBOL(fb_blank);
1777 EXPORT_SYMBOL(fb_pan_display);
1778 EXPORT_SYMBOL(fb_get_buffer_offset);
1779 EXPORT_SYMBOL(fb_set_suspend);
1780 EXPORT_SYMBOL(fb_get_options);
1781
1782 MODULE_LICENSE("GPL");
Linux with added FPC-III support