eb6fb489f2993af426720240e6463ff1c5019883
[linux-3.10.git] / drivers / video / fbmem.c
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
36 #include <asm/fb.h>
37
38
39     /*
40      *  Frame buffer device initialization and setup routines
41      */
42
43 #define FBPIXMAPSIZE    (1024 * 8)
44
45 static DEFINE_MUTEX(registration_lock);
46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
47 int num_registered_fb __read_mostly;
48
49 static struct fb_info *get_fb_info(unsigned int idx)
50 {
51         struct fb_info *fb_info;
52
53         if (idx >= FB_MAX)
54                 return ERR_PTR(-ENODEV);
55
56         mutex_lock(&registration_lock);
57         fb_info = registered_fb[idx];
58         if (fb_info)
59                 atomic_inc(&fb_info->count);
60         mutex_unlock(&registration_lock);
61
62         return fb_info;
63 }
64
65 static void put_fb_info(struct fb_info *fb_info)
66 {
67         if (!atomic_dec_and_test(&fb_info->count))
68                 return;
69         if (fb_info->fbops->fb_destroy)
70                 fb_info->fbops->fb_destroy(fb_info);
71 }
72
73 int lock_fb_info(struct fb_info *info)
74 {
75         mutex_lock(&info->lock);
76         if (!info->fbops) {
77                 mutex_unlock(&info->lock);
78                 return 0;
79         }
80         return 1;
81 }
82 EXPORT_SYMBOL(lock_fb_info);
83
84 /*
85  * Helpers
86  */
87
88 int fb_get_color_depth(struct fb_var_screeninfo *var,
89                        struct fb_fix_screeninfo *fix)
90 {
91         int depth = 0;
92
93         if (fix->visual == FB_VISUAL_MONO01 ||
94             fix->visual == FB_VISUAL_MONO10)
95                 depth = 1;
96         else {
97                 if (var->green.length == var->blue.length &&
98                     var->green.length == var->red.length &&
99                     var->green.offset == var->blue.offset &&
100                     var->green.offset == var->red.offset)
101                         depth = var->green.length;
102                 else
103                         depth = var->green.length + var->red.length +
104                                 var->blue.length;
105         }
106
107         return depth;
108 }
109 EXPORT_SYMBOL(fb_get_color_depth);
110
111 /*
112  * Data padding functions.
113  */
114 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
115 {
116         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
117 }
118 EXPORT_SYMBOL(fb_pad_aligned_buffer);
119
120 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
121                                 u32 shift_high, u32 shift_low, u32 mod)
122 {
123         u8 mask = (u8) (0xfff << shift_high), tmp;
124         int i, j;
125
126         for (i = height; i--; ) {
127                 for (j = 0; j < idx; j++) {
128                         tmp = dst[j];
129                         tmp &= mask;
130                         tmp |= *src >> shift_low;
131                         dst[j] = tmp;
132                         tmp = *src << shift_high;
133                         dst[j+1] = tmp;
134                         src++;
135                 }
136                 tmp = dst[idx];
137                 tmp &= mask;
138                 tmp |= *src >> shift_low;
139                 dst[idx] = tmp;
140                 if (shift_high < mod) {
141                         tmp = *src << shift_high;
142                         dst[idx+1] = tmp;
143                 }
144                 src++;
145                 dst += d_pitch;
146         }
147 }
148 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
149
150 /*
151  * we need to lock this section since fb_cursor
152  * may use fb_imageblit()
153  */
154 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
155 {
156         u32 align = buf->buf_align - 1, offset;
157         char *addr = buf->addr;
158
159         /* If IO mapped, we need to sync before access, no sharing of
160          * the pixmap is done
161          */
162         if (buf->flags & FB_PIXMAP_IO) {
163                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
164                         info->fbops->fb_sync(info);
165                 return addr;
166         }
167
168         /* See if we fit in the remaining pixmap space */
169         offset = buf->offset + align;
170         offset &= ~align;
171         if (offset + size > buf->size) {
172                 /* We do not fit. In order to be able to re-use the buffer,
173                  * we must ensure no asynchronous DMA'ing or whatever operation
174                  * is in progress, we sync for that.
175                  */
176                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
177                         info->fbops->fb_sync(info);
178                 offset = 0;
179         }
180         buf->offset = offset + size;
181         addr += offset;
182
183         return addr;
184 }
185
186 #ifdef CONFIG_LOGO
187
188 static inline unsigned safe_shift(unsigned d, int n)
189 {
190         return n < 0 ? d >> -n : d << n;
191 }
192
193 static void fb_set_logocmap(struct fb_info *info,
194                                    const struct linux_logo *logo)
195 {
196         struct fb_cmap palette_cmap;
197         u16 palette_green[16];
198         u16 palette_blue[16];
199         u16 palette_red[16];
200         int i, j, n;
201         const unsigned char *clut = logo->clut;
202
203         palette_cmap.start = 0;
204         palette_cmap.len = 16;
205         palette_cmap.red = palette_red;
206         palette_cmap.green = palette_green;
207         palette_cmap.blue = palette_blue;
208         palette_cmap.transp = NULL;
209
210         for (i = 0; i < logo->clutsize; i += n) {
211                 n = logo->clutsize - i;
212                 /* palette_cmap provides space for only 16 colors at once */
213                 if (n > 16)
214                         n = 16;
215                 palette_cmap.start = 32 + i;
216                 palette_cmap.len = n;
217                 for (j = 0; j < n; ++j) {
218                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
219                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
220                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
221                         clut += 3;
222                 }
223                 fb_set_cmap(&palette_cmap, info);
224         }
225 }
226
227 static void  fb_set_logo_truepalette(struct fb_info *info,
228                                             const struct linux_logo *logo,
229                                             u32 *palette)
230 {
231         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
232         unsigned char redmask, greenmask, bluemask;
233         int redshift, greenshift, blueshift;
234         int i;
235         const unsigned char *clut = logo->clut;
236
237         /*
238          * We have to create a temporary palette since console palette is only
239          * 16 colors long.
240          */
241         /* Bug: Doesn't obey msb_right ... (who needs that?) */
242         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
243         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
244         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
245         redshift   = info->var.red.offset   - (8 - info->var.red.length);
246         greenshift = info->var.green.offset - (8 - info->var.green.length);
247         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
248
249         for ( i = 0; i < logo->clutsize; i++) {
250                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
251                                  safe_shift((clut[1] & greenmask), greenshift) |
252                                  safe_shift((clut[2] & bluemask), blueshift));
253                 clut += 3;
254         }
255 }
256
257 static void fb_set_logo_directpalette(struct fb_info *info,
258                                              const struct linux_logo *logo,
259                                              u32 *palette)
260 {
261         int redshift, greenshift, blueshift;
262         int i;
263
264         redshift = info->var.red.offset;
265         greenshift = info->var.green.offset;
266         blueshift = info->var.blue.offset;
267
268         for (i = 32; i < 32 + logo->clutsize; i++)
269                 palette[i] = i << redshift | i << greenshift | i << blueshift;
270 }
271
272 static void fb_set_logo(struct fb_info *info,
273                                const struct linux_logo *logo, u8 *dst,
274                                int depth)
275 {
276         int i, j, k;
277         const u8 *src = logo->data;
278         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
279         u8 fg = 1, d;
280
281         switch (fb_get_color_depth(&info->var, &info->fix)) {
282         case 1:
283                 fg = 1;
284                 break;
285         case 2:
286                 fg = 3;
287                 break;
288         default:
289                 fg = 7;
290                 break;
291         }
292
293         if (info->fix.visual == FB_VISUAL_MONO01 ||
294             info->fix.visual == FB_VISUAL_MONO10)
295                 fg = ~((u8) (0xfff << info->var.green.length));
296
297         switch (depth) {
298         case 4:
299                 for (i = 0; i < logo->height; i++)
300                         for (j = 0; j < logo->width; src++) {
301                                 *dst++ = *src >> 4;
302                                 j++;
303                                 if (j < logo->width) {
304                                         *dst++ = *src & 0x0f;
305                                         j++;
306                                 }
307                         }
308                 break;
309         case 1:
310                 for (i = 0; i < logo->height; i++) {
311                         for (j = 0; j < logo->width; src++) {
312                                 d = *src ^ xor;
313                                 for (k = 7; k >= 0; k--) {
314                                         *dst++ = ((d >> k) & 1) ? fg : 0;
315                                         j++;
316                                 }
317                         }
318                 }
319                 break;
320         }
321 }
322
323 /*
324  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
325  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
326  * the visual format and color depth of the framebuffer, the DAC, the
327  * pseudo_palette, and the logo data will be adjusted accordingly.
328  *
329  * Case 1 - linux_logo_clut224:
330  * Color exceeds the number of console colors (16), thus we set the hardware DAC
331  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
332  *
333  * For visuals that require color info from the pseudo_palette, we also construct
334  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
335  * will be set.
336  *
337  * Case 2 - linux_logo_vga16:
338  * The number of colors just matches the console colors, thus there is no need
339  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
340  * each byte contains color information for two pixels (upper and lower nibble).
341  * To be consistent with fb_imageblit() usage, we therefore separate the two
342  * nibbles into separate bytes. The "depth" flag will be set to 4.
343  *
344  * Case 3 - linux_logo_mono:
345  * This is similar with Case 2.  Each byte contains information for 8 pixels.
346  * We isolate each bit and expand each into a byte. The "depth" flag will
347  * be set to 1.
348  */
349 static struct logo_data {
350         int depth;
351         int needs_directpalette;
352         int needs_truepalette;
353         int needs_cmapreset;
354         const struct linux_logo *logo;
355 } fb_logo __read_mostly;
356
357 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
358 {
359         u32 size = width * height, i;
360
361         out += size - 1;
362
363         for (i = size; i--; )
364                 *out-- = *in++;
365 }
366
367 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
368 {
369         int i, j, h = height - 1;
370
371         for (i = 0; i < height; i++)
372                 for (j = 0; j < width; j++)
373                                 out[height * j + h - i] = *in++;
374 }
375
376 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
377 {
378         int i, j, w = width - 1;
379
380         for (i = 0; i < height; i++)
381                 for (j = 0; j < width; j++)
382                         out[height * (w - j) + i] = *in++;
383 }
384
385 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
386                            struct fb_image *image, int rotate)
387 {
388         u32 tmp;
389
390         if (rotate == FB_ROTATE_UD) {
391                 fb_rotate_logo_ud(image->data, dst, image->width,
392                                   image->height);
393                 image->dx = info->var.xres - image->width - image->dx;
394                 image->dy = info->var.yres - image->height - image->dy;
395         } else if (rotate == FB_ROTATE_CW) {
396                 fb_rotate_logo_cw(image->data, dst, image->width,
397                                   image->height);
398                 tmp = image->width;
399                 image->width = image->height;
400                 image->height = tmp;
401                 tmp = image->dy;
402                 image->dy = image->dx;
403                 image->dx = info->var.xres - image->width - tmp;
404         } else if (rotate == FB_ROTATE_CCW) {
405                 fb_rotate_logo_ccw(image->data, dst, image->width,
406                                    image->height);
407                 tmp = image->width;
408                 image->width = image->height;
409                 image->height = tmp;
410                 tmp = image->dx;
411                 image->dx = image->dy;
412                 image->dy = info->var.yres - image->height - tmp;
413         }
414
415         image->data = dst;
416 }
417
418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
419                             int rotate, unsigned int num)
420 {
421         unsigned int x;
422
423         if (rotate == FB_ROTATE_UR) {
424                 for (x = 0;
425                      x < num && image->dx + image->width <= info->var.xres;
426                      x++) {
427                         info->fbops->fb_imageblit(info, image);
428                         image->dx += image->width + 8;
429                 }
430         } else if (rotate == FB_ROTATE_UD) {
431                 for (x = 0; x < num && image->dx >= 0; x++) {
432                         info->fbops->fb_imageblit(info, image);
433                         image->dx -= image->width + 8;
434                 }
435         } else if (rotate == FB_ROTATE_CW) {
436                 for (x = 0;
437                      x < num && image->dy + image->height <= info->var.yres;
438                      x++) {
439                         info->fbops->fb_imageblit(info, image);
440                         image->dy += image->height + 8;
441                 }
442         } else if (rotate == FB_ROTATE_CCW) {
443                 for (x = 0; x < num && image->dy >= 0; x++) {
444                         info->fbops->fb_imageblit(info, image);
445                         image->dy -= image->height + 8;
446                 }
447         }
448 }
449
450 static int fb_show_logo_line(struct fb_info *info, int rotate,
451                              const struct linux_logo *logo, int y,
452                              unsigned int n)
453 {
454         u32 *palette = NULL, *saved_pseudo_palette = NULL;
455         unsigned char *logo_new = NULL, *logo_rotate = NULL;
456         struct fb_image image;
457
458         /* Return if the frame buffer is not mapped or suspended */
459         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
460             info->flags & FBINFO_MODULE)
461                 return 0;
462
463         image.depth = 8;
464         image.data = logo->data;
465
466         if (fb_logo.needs_cmapreset)
467                 fb_set_logocmap(info, logo);
468
469         if (fb_logo.needs_truepalette ||
470             fb_logo.needs_directpalette) {
471                 palette = kmalloc(256 * 4, GFP_KERNEL);
472                 if (palette == NULL)
473                         return 0;
474
475                 if (fb_logo.needs_truepalette)
476                         fb_set_logo_truepalette(info, logo, palette);
477                 else
478                         fb_set_logo_directpalette(info, logo, palette);
479
480                 saved_pseudo_palette = info->pseudo_palette;
481                 info->pseudo_palette = palette;
482         }
483
484         if (fb_logo.depth <= 4) {
485                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
486                 if (logo_new == NULL) {
487                         kfree(palette);
488                         if (saved_pseudo_palette)
489                                 info->pseudo_palette = saved_pseudo_palette;
490                         return 0;
491                 }
492                 image.data = logo_new;
493                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
494         }
495
496         image.dx = 0;
497         image.dy = y;
498         image.width = logo->width;
499         image.height = logo->height;
500
501         if (rotate) {
502                 logo_rotate = kmalloc(logo->width *
503                                       logo->height, GFP_KERNEL);
504                 if (logo_rotate)
505                         fb_rotate_logo(info, logo_rotate, &image, rotate);
506         }
507
508         fb_do_show_logo(info, &image, rotate, n);
509
510         kfree(palette);
511         if (saved_pseudo_palette != NULL)
512                 info->pseudo_palette = saved_pseudo_palette;
513         kfree(logo_new);
514         kfree(logo_rotate);
515         return logo->height;
516 }
517
518
519 #ifdef CONFIG_FB_LOGO_EXTRA
520
521 #define FB_LOGO_EX_NUM_MAX 10
522 static struct logo_data_extra {
523         const struct linux_logo *logo;
524         unsigned int n;
525 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
526 static unsigned int fb_logo_ex_num;
527
528 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
529 {
530         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
531                 return;
532
533         fb_logo_ex[fb_logo_ex_num].logo = logo;
534         fb_logo_ex[fb_logo_ex_num].n = n;
535         fb_logo_ex_num++;
536 }
537
538 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
539                                   unsigned int yres)
540 {
541         unsigned int i;
542
543         /* FIXME: logo_ex supports only truecolor fb. */
544         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
545                 fb_logo_ex_num = 0;
546
547         for (i = 0; i < fb_logo_ex_num; i++) {
548                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
549                         fb_logo_ex[i].logo = NULL;
550                         continue;
551                 }
552                 height += fb_logo_ex[i].logo->height;
553                 if (height > yres) {
554                         height -= fb_logo_ex[i].logo->height;
555                         fb_logo_ex_num = i;
556                         break;
557                 }
558         }
559         return height;
560 }
561
562 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
563 {
564         unsigned int i;
565
566         for (i = 0; i < fb_logo_ex_num; i++)
567                 y += fb_show_logo_line(info, rotate,
568                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
569
570         return y;
571 }
572
573 #else /* !CONFIG_FB_LOGO_EXTRA */
574
575 static inline int fb_prepare_extra_logos(struct fb_info *info,
576                                          unsigned int height,
577                                          unsigned int yres)
578 {
579         return height;
580 }
581
582 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
583 {
584         return y;
585 }
586
587 #endif /* CONFIG_FB_LOGO_EXTRA */
588
589
590 int fb_prepare_logo(struct fb_info *info, int rotate)
591 {
592         int depth = fb_get_color_depth(&info->var, &info->fix);
593         unsigned int yres;
594
595         memset(&fb_logo, 0, sizeof(struct logo_data));
596
597         if (info->flags & FBINFO_MISC_TILEBLITTING ||
598             info->flags & FBINFO_MODULE)
599                 return 0;
600
601         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
602                 depth = info->var.blue.length;
603                 if (info->var.red.length < depth)
604                         depth = info->var.red.length;
605                 if (info->var.green.length < depth)
606                         depth = info->var.green.length;
607         }
608
609         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
610                 /* assume console colormap */
611                 depth = 4;
612         }
613
614         /* Return if no suitable logo was found */
615         fb_logo.logo = fb_find_logo(depth);
616
617         if (!fb_logo.logo) {
618                 return 0;
619         }
620
621         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
622                 yres = info->var.yres;
623         else
624                 yres = info->var.xres;
625
626         if (fb_logo.logo->height > yres) {
627                 fb_logo.logo = NULL;
628                 return 0;
629         }
630
631         /* What depth we asked for might be different from what we get */
632         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
633                 fb_logo.depth = 8;
634         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
635                 fb_logo.depth = 4;
636         else
637                 fb_logo.depth = 1;
638
639
640         if (fb_logo.depth > 4 && depth > 4) {
641                 switch (info->fix.visual) {
642                 case FB_VISUAL_TRUECOLOR:
643                         fb_logo.needs_truepalette = 1;
644                         break;
645                 case FB_VISUAL_DIRECTCOLOR:
646                         fb_logo.needs_directpalette = 1;
647                         fb_logo.needs_cmapreset = 1;
648                         break;
649                 case FB_VISUAL_PSEUDOCOLOR:
650                         fb_logo.needs_cmapreset = 1;
651                         break;
652                 }
653         }
654
655         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
656 }
657
658 int fb_show_logo(struct fb_info *info, int rotate)
659 {
660         int y;
661
662         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
663                               num_online_cpus());
664         y = fb_show_extra_logos(info, y, rotate);
665
666         return y;
667 }
668 #else
669 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
670 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
671 #endif /* CONFIG_LOGO */
672
673 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
674 {
675         mutex_lock(&registration_lock);
676         return (*pos < FB_MAX) ? pos : NULL;
677 }
678
679 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
680 {
681         (*pos)++;
682         return (*pos < FB_MAX) ? pos : NULL;
683 }
684
685 static void fb_seq_stop(struct seq_file *m, void *v)
686 {
687         mutex_unlock(&registration_lock);
688 }
689
690 static int fb_seq_show(struct seq_file *m, void *v)
691 {
692         int i = *(loff_t *)v;
693         struct fb_info *fi = registered_fb[i];
694
695         if (fi)
696                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
697         return 0;
698 }
699
700 static const struct seq_operations proc_fb_seq_ops = {
701         .start  = fb_seq_start,
702         .next   = fb_seq_next,
703         .stop   = fb_seq_stop,
704         .show   = fb_seq_show,
705 };
706
707 static int proc_fb_open(struct inode *inode, struct file *file)
708 {
709         return seq_open(file, &proc_fb_seq_ops);
710 }
711
712 static const struct file_operations fb_proc_fops = {
713         .owner          = THIS_MODULE,
714         .open           = proc_fb_open,
715         .read           = seq_read,
716         .llseek         = seq_lseek,
717         .release        = seq_release,
718 };
719
720 /*
721  * We hold a reference to the fb_info in file->private_data,
722  * but if the current registered fb has changed, we don't
723  * actually want to use it.
724  *
725  * So look up the fb_info using the inode minor number,
726  * and just verify it against the reference we have.
727  */
728 static struct fb_info *file_fb_info(struct file *file)
729 {
730         struct inode *inode = file_inode(file);
731         int fbidx = iminor(inode);
732         struct fb_info *info = registered_fb[fbidx];
733
734         if (info != file->private_data)
735                 info = NULL;
736         return info;
737 }
738
739 static ssize_t
740 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
741 {
742         unsigned long p = *ppos;
743         struct fb_info *info = file_fb_info(file);
744         u8 *buffer, *dst;
745         u8 __iomem *src;
746         int c, cnt = 0, err = 0;
747         unsigned long total_size;
748
749         if (!info || ! info->screen_base)
750                 return -ENODEV;
751
752         if (info->state != FBINFO_STATE_RUNNING)
753                 return -EPERM;
754
755         if (info->fbops->fb_read)
756                 return info->fbops->fb_read(info, buf, count, ppos);
757         
758         total_size = info->screen_size;
759
760         if (total_size == 0)
761                 total_size = info->fix.smem_len;
762
763         if (p >= total_size)
764                 return 0;
765
766         if (count >= total_size)
767                 count = total_size;
768
769         if (count + p > total_size)
770                 count = total_size - p;
771
772         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
773                          GFP_KERNEL);
774         if (!buffer)
775                 return -ENOMEM;
776
777         src = (u8 __iomem *) (info->screen_base + p);
778
779         if (info->fbops->fb_sync)
780                 info->fbops->fb_sync(info);
781
782         while (count) {
783                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
784                 dst = buffer;
785                 fb_memcpy_fromfb(dst, src, c);
786                 dst += c;
787                 src += c;
788
789                 if (copy_to_user(buf, buffer, c)) {
790                         err = -EFAULT;
791                         break;
792                 }
793                 *ppos += c;
794                 buf += c;
795                 cnt += c;
796                 count -= c;
797         }
798
799         kfree(buffer);
800
801         return (err) ? err : cnt;
802 }
803
804 static ssize_t
805 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
806 {
807         unsigned long p = *ppos;
808         struct fb_info *info = file_fb_info(file);
809         u8 *buffer, *src;
810         u8 __iomem *dst;
811         int c, cnt = 0, err = 0;
812         unsigned long total_size;
813
814         if (!info || !info->screen_base)
815                 return -ENODEV;
816
817         if (info->state != FBINFO_STATE_RUNNING)
818                 return -EPERM;
819
820         if (info->fbops->fb_write)
821                 return info->fbops->fb_write(info, buf, count, ppos);
822         
823         total_size = info->screen_size;
824
825         if (total_size == 0)
826                 total_size = info->fix.smem_len;
827
828         if (p > total_size)
829                 return -EFBIG;
830
831         if (count > total_size) {
832                 err = -EFBIG;
833                 count = total_size;
834         }
835
836         if (count + p > total_size) {
837                 if (!err)
838                         err = -ENOSPC;
839
840                 count = total_size - p;
841         }
842
843         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
844                          GFP_KERNEL);
845         if (!buffer)
846                 return -ENOMEM;
847
848         dst = (u8 __iomem *) (info->screen_base + p);
849
850         if (info->fbops->fb_sync)
851                 info->fbops->fb_sync(info);
852
853         while (count) {
854                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
855                 src = buffer;
856
857                 if (copy_from_user(src, buf, c)) {
858                         err = -EFAULT;
859                         break;
860                 }
861
862                 fb_memcpy_tofb(dst, src, c);
863                 dst += c;
864                 src += c;
865                 *ppos += c;
866                 buf += c;
867                 cnt += c;
868                 count -= c;
869         }
870
871         kfree(buffer);
872
873         return (cnt) ? cnt : err;
874 }
875
876 int
877 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
878 {
879         struct fb_fix_screeninfo *fix = &info->fix;
880         unsigned int yres = info->var.yres;
881         int err = 0;
882
883         if (var->yoffset > 0) {
884                 if (var->vmode & FB_VMODE_YWRAP) {
885                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
886                                 err = -EINVAL;
887                         else
888                                 yres = 0;
889                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
890                         err = -EINVAL;
891         }
892
893         if (var->xoffset > 0 && (!fix->xpanstep ||
894                                  (var->xoffset % fix->xpanstep)))
895                 err = -EINVAL;
896
897         if (err || !info->fbops->fb_pan_display ||
898             var->yoffset > info->var.yres_virtual - yres ||
899             var->xoffset > info->var.xres_virtual - info->var.xres)
900                 return -EINVAL;
901
902         if ((err = info->fbops->fb_pan_display(var, info)))
903                 return err;
904         info->var.xoffset = var->xoffset;
905         info->var.yoffset = var->yoffset;
906         if (var->vmode & FB_VMODE_YWRAP)
907                 info->var.vmode |= FB_VMODE_YWRAP;
908         else
909                 info->var.vmode &= ~FB_VMODE_YWRAP;
910         return 0;
911 }
912
913 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
914                          u32 activate)
915 {
916         struct fb_event event;
917         struct fb_blit_caps caps, fbcaps;
918         int err = 0;
919
920         memset(&caps, 0, sizeof(caps));
921         memset(&fbcaps, 0, sizeof(fbcaps));
922         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
923         event.info = info;
924         event.data = &caps;
925         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
926         info->fbops->fb_get_caps(info, &fbcaps, var);
927
928         if (((fbcaps.x ^ caps.x) & caps.x) ||
929             ((fbcaps.y ^ caps.y) & caps.y) ||
930             (fbcaps.len < caps.len))
931                 err = -EINVAL;
932
933         return err;
934 }
935
936 int
937 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
938 {
939         int flags = info->flags;
940         int ret = 0;
941
942         if (var->activate & FB_ACTIVATE_INV_MODE) {
943                 struct fb_videomode mode1, mode2;
944
945                 fb_var_to_videomode(&mode1, var);
946                 fb_var_to_videomode(&mode2, &info->var);
947                 /* make sure we don't delete the videomode of current var */
948                 ret = fb_mode_is_equal(&mode1, &mode2);
949
950                 if (!ret) {
951                     struct fb_event event;
952
953                     event.info = info;
954                     event.data = &mode1;
955                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
956                 }
957
958                 if (!ret)
959                     fb_delete_videomode(&mode1, &info->modelist);
960
961
962                 ret = (ret) ? -EINVAL : 0;
963                 goto done;
964         }
965
966         if ((var->activate & FB_ACTIVATE_FORCE) ||
967             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
968                 u32 activate = var->activate;
969
970                 /* When using FOURCC mode, make sure the red, green, blue and
971                  * transp fields are set to 0.
972                  */
973                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
974                     var->grayscale > 1) {
975                         if (var->red.offset     || var->green.offset    ||
976                             var->blue.offset    || var->transp.offset   ||
977                             var->red.length     || var->green.length    ||
978                             var->blue.length    || var->transp.length   ||
979                             var->red.msb_right  || var->green.msb_right ||
980                             var->blue.msb_right || var->transp.msb_right)
981                                 return -EINVAL;
982                 }
983
984                 if (!info->fbops->fb_check_var) {
985                         *var = info->var;
986                         goto done;
987                 }
988
989                 ret = info->fbops->fb_check_var(var, info);
990
991                 if (ret)
992                         goto done;
993
994                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
995                         struct fb_var_screeninfo old_var;
996                         struct fb_videomode mode;
997
998                         if (info->fbops->fb_get_caps) {
999                                 ret = fb_check_caps(info, var, activate);
1000
1001                                 if (ret)
1002                                         goto done;
1003                         }
1004
1005                         old_var = info->var;
1006                         info->var = *var;
1007
1008                         if (info->fbops->fb_set_par) {
1009                                 ret = info->fbops->fb_set_par(info);
1010
1011                                 if (ret) {
1012                                         info->var = old_var;
1013                                         printk(KERN_WARNING "detected "
1014                                                 "fb_set_par error, "
1015                                                 "error code: %d\n", ret);
1016                                         goto done;
1017                                 }
1018                         }
1019
1020                         fb_pan_display(info, &info->var);
1021                         fb_set_cmap(&info->cmap, info);
1022                         fb_var_to_videomode(&mode, &info->var);
1023
1024                         if (info->modelist.prev && info->modelist.next &&
1025                             !list_empty(&info->modelist))
1026                                 ret = fb_add_videomode(&mode, &info->modelist);
1027
1028                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1029                                 struct fb_event event;
1030                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1031                                         FB_EVENT_MODE_CHANGE_ALL :
1032                                         FB_EVENT_MODE_CHANGE;
1033
1034                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1035                                 event.info = info;
1036                                 event.data = &mode;
1037                                 fb_notifier_call_chain(evnt, &event);
1038                         }
1039                 }
1040         }
1041
1042  done:
1043         return ret;
1044 }
1045
1046 int
1047 fb_blank(struct fb_info *info, int blank)
1048 {       
1049         struct fb_event event;
1050         int ret = -EINVAL, early_ret;
1051
1052         if (blank > FB_BLANK_POWERDOWN)
1053                 blank = FB_BLANK_POWERDOWN;
1054
1055         event.info = info;
1056         event.data = &blank;
1057
1058         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1059
1060         if (info->fbops->fb_blank)
1061                 ret = info->fbops->fb_blank(blank, info);
1062
1063         if (!ret)
1064                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1065         else {
1066                 /*
1067                  * if fb_blank is failed then revert effects of
1068                  * the early blank event.
1069                  */
1070                 if (!early_ret)
1071                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1072         }
1073
1074         return ret;
1075 }
1076
1077 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1078                         unsigned long arg)
1079 {
1080         struct fb_ops *fb;
1081         struct fb_var_screeninfo var;
1082         struct fb_fix_screeninfo fix;
1083         struct fb_con2fbmap con2fb;
1084         struct fb_cmap cmap_from;
1085         struct fb_cmap_user cmap;
1086         struct fb_event event;
1087         void __user *argp = (void __user *)arg;
1088         long ret = 0;
1089
1090         switch (cmd) {
1091         case FBIOGET_VSCREENINFO:
1092                 if (!lock_fb_info(info))
1093                         return -ENODEV;
1094                 var = info->var;
1095                 unlock_fb_info(info);
1096
1097                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1098                 break;
1099         case FBIOPUT_VSCREENINFO:
1100                 if (copy_from_user(&var, argp, sizeof(var)))
1101                         return -EFAULT;
1102                 if (!lock_fb_info(info))
1103                         return -ENODEV;
1104                 console_lock();
1105                 info->flags |= FBINFO_MISC_USEREVENT;
1106                 ret = fb_set_var(info, &var);
1107                 info->flags &= ~FBINFO_MISC_USEREVENT;
1108                 console_unlock();
1109                 unlock_fb_info(info);
1110                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1111                         ret = -EFAULT;
1112                 break;
1113         case FBIOGET_FSCREENINFO:
1114                 if (!lock_fb_info(info))
1115                         return -ENODEV;
1116                 fix = info->fix;
1117                 unlock_fb_info(info);
1118
1119                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1120                 break;
1121         case FBIOPUTCMAP:
1122                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1123                         return -EFAULT;
1124                 ret = fb_set_user_cmap(&cmap, info);
1125                 break;
1126         case FBIOGETCMAP:
1127                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1128                         return -EFAULT;
1129                 if (!lock_fb_info(info))
1130                         return -ENODEV;
1131                 cmap_from = info->cmap;
1132                 unlock_fb_info(info);
1133                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1134                 break;
1135         case FBIOPAN_DISPLAY:
1136                 if (copy_from_user(&var, argp, sizeof(var)))
1137                         return -EFAULT;
1138                 if (!lock_fb_info(info))
1139                         return -ENODEV;
1140                 console_lock();
1141                 ret = fb_pan_display(info, &var);
1142                 console_unlock();
1143                 unlock_fb_info(info);
1144                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1145                         return -EFAULT;
1146                 break;
1147         case FBIO_CURSOR:
1148                 ret = -EINVAL;
1149                 break;
1150         case FBIOGET_CON2FBMAP:
1151                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1152                         return -EFAULT;
1153                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1154                         return -EINVAL;
1155                 con2fb.framebuffer = -1;
1156                 event.data = &con2fb;
1157                 if (!lock_fb_info(info))
1158                         return -ENODEV;
1159                 event.info = info;
1160                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1161                 unlock_fb_info(info);
1162                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1163                 break;
1164         case FBIOPUT_CON2FBMAP:
1165                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1166                         return -EFAULT;
1167                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1168                         return -EINVAL;
1169                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1170                         return -EINVAL;
1171                 if (!registered_fb[con2fb.framebuffer])
1172                         request_module("fb%d", con2fb.framebuffer);
1173                 if (!registered_fb[con2fb.framebuffer]) {
1174                         ret = -EINVAL;
1175                         break;
1176                 }
1177                 event.data = &con2fb;
1178                 if (!lock_fb_info(info))
1179                         return -ENODEV;
1180                 console_lock();
1181                 event.info = info;
1182                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1183                 console_unlock();
1184                 unlock_fb_info(info);
1185                 break;
1186         case FBIOBLANK:
1187                 if (!lock_fb_info(info))
1188                         return -ENODEV;
1189                 pr_info("FBIOBLANK acquiring console_lock\n");
1190                 console_lock();
1191                 pr_info("FBIOBLANK console_lock taken\n");
1192                 info->flags |= FBINFO_MISC_USEREVENT;
1193                 ret = fb_blank(info, arg);
1194                 info->flags &= ~FBINFO_MISC_USEREVENT;
1195                 console_unlock();
1196                 unlock_fb_info(info);
1197                 pr_info("FBIOBLANK console_unlock done\n");
1198                 break;
1199         default:
1200                 if (!lock_fb_info(info))
1201                         return -ENODEV;
1202                 fb = info->fbops;
1203                 if (fb->fb_ioctl)
1204                         ret = fb->fb_ioctl(info, cmd, arg);
1205                 else
1206                         ret = -ENOTTY;
1207                 unlock_fb_info(info);
1208         }
1209         return ret;
1210 }
1211
1212 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1213 {
1214         struct fb_info *info = file_fb_info(file);
1215
1216         if (!info)
1217                 return -ENODEV;
1218         return do_fb_ioctl(info, cmd, arg);
1219 }
1220
1221 #ifdef CONFIG_COMPAT
1222 struct fb_fix_screeninfo32 {
1223         char                    id[16];
1224         compat_caddr_t          smem_start;
1225         u32                     smem_len;
1226         u32                     type;
1227         u32                     type_aux;
1228         u32                     visual;
1229         u16                     xpanstep;
1230         u16                     ypanstep;
1231         u16                     ywrapstep;
1232         u32                     line_length;
1233         compat_caddr_t          mmio_start;
1234         u32                     mmio_len;
1235         u32                     accel;
1236         u16                     reserved[3];
1237 };
1238
1239 struct fb_cmap32 {
1240         u32                     start;
1241         u32                     len;
1242         compat_caddr_t  red;
1243         compat_caddr_t  green;
1244         compat_caddr_t  blue;
1245         compat_caddr_t  transp;
1246 };
1247
1248 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1249                           unsigned long arg)
1250 {
1251         struct fb_cmap_user __user *cmap;
1252         struct fb_cmap32 __user *cmap32;
1253         __u32 data;
1254         int err;
1255
1256         cmap = compat_alloc_user_space(sizeof(*cmap));
1257         cmap32 = compat_ptr(arg);
1258
1259         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1260                 return -EFAULT;
1261
1262         if (get_user(data, &cmap32->red) ||
1263             put_user(compat_ptr(data), &cmap->red) ||
1264             get_user(data, &cmap32->green) ||
1265             put_user(compat_ptr(data), &cmap->green) ||
1266             get_user(data, &cmap32->blue) ||
1267             put_user(compat_ptr(data), &cmap->blue) ||
1268             get_user(data, &cmap32->transp) ||
1269             put_user(compat_ptr(data), &cmap->transp))
1270                 return -EFAULT;
1271
1272         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1273
1274         if (!err) {
1275                 if (copy_in_user(&cmap32->start,
1276                                  &cmap->start,
1277                                  2 * sizeof(__u32)))
1278                         err = -EFAULT;
1279         }
1280         return err;
1281 }
1282
1283 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1284                                   struct fb_fix_screeninfo32 __user *fix32)
1285 {
1286         __u32 data;
1287         int err;
1288
1289         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1290
1291         data = (__u32) (unsigned long) fix->smem_start;
1292         err |= put_user(data, &fix32->smem_start);
1293
1294         err |= put_user(fix->smem_len, &fix32->smem_len);
1295         err |= put_user(fix->type, &fix32->type);
1296         err |= put_user(fix->type_aux, &fix32->type_aux);
1297         err |= put_user(fix->visual, &fix32->visual);
1298         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1299         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1300         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1301         err |= put_user(fix->line_length, &fix32->line_length);
1302
1303         data = (__u32) (unsigned long) fix->mmio_start;
1304         err |= put_user(data, &fix32->mmio_start);
1305
1306         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1307         err |= put_user(fix->accel, &fix32->accel);
1308         err |= copy_to_user(fix32->reserved, fix->reserved,
1309                             sizeof(fix->reserved));
1310
1311         return err;
1312 }
1313
1314 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1315                               unsigned long arg)
1316 {
1317         mm_segment_t old_fs;
1318         struct fb_fix_screeninfo fix;
1319         struct fb_fix_screeninfo32 __user *fix32;
1320         int err;
1321
1322         fix32 = compat_ptr(arg);
1323
1324         old_fs = get_fs();
1325         set_fs(KERNEL_DS);
1326         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1327         set_fs(old_fs);
1328
1329         if (!err)
1330                 err = do_fscreeninfo_to_user(&fix, fix32);
1331
1332         return err;
1333 }
1334
1335 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1336                             unsigned long arg)
1337 {
1338         struct fb_info *info = file_fb_info(file);
1339         struct fb_ops *fb;
1340         long ret = -ENOIOCTLCMD;
1341
1342         if (!info)
1343                 return -ENODEV;
1344         fb = info->fbops;
1345         switch(cmd) {
1346         case FBIOGET_VSCREENINFO:
1347         case FBIOPUT_VSCREENINFO:
1348         case FBIOPAN_DISPLAY:
1349         case FBIOGET_CON2FBMAP:
1350         case FBIOPUT_CON2FBMAP:
1351                 arg = (unsigned long) compat_ptr(arg);
1352         case FBIOBLANK:
1353                 ret = do_fb_ioctl(info, cmd, arg);
1354                 break;
1355
1356         case FBIOGET_FSCREENINFO:
1357                 ret = fb_get_fscreeninfo(info, cmd, arg);
1358                 break;
1359
1360         case FBIOGETCMAP:
1361         case FBIOPUTCMAP:
1362                 ret = fb_getput_cmap(info, cmd, arg);
1363                 break;
1364
1365         default:
1366                 if (fb->fb_compat_ioctl)
1367                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1368                 break;
1369         }
1370         return ret;
1371 }
1372 #endif
1373
1374 static int
1375 fb_mmap(struct file *file, struct vm_area_struct * vma)
1376 {
1377         struct fb_info *info = file_fb_info(file);
1378         struct fb_ops *fb;
1379         unsigned long mmio_pgoff;
1380         unsigned long start;
1381         u32 len;
1382
1383         if (!info)
1384                 return -ENODEV;
1385         fb = info->fbops;
1386         if (!fb)
1387                 return -ENODEV;
1388         mutex_lock(&info->mm_lock);
1389         if (fb->fb_mmap) {
1390                 int res;
1391                 res = fb->fb_mmap(info, vma);
1392                 mutex_unlock(&info->mm_lock);
1393                 return res;
1394         }
1395
1396         /*
1397          * Ugh. This can be either the frame buffer mapping, or
1398          * if pgoff points past it, the mmio mapping.
1399          */
1400         start = info->fix.smem_start;
1401         len = info->fix.smem_len;
1402         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1403         if (vma->vm_pgoff >= mmio_pgoff) {
1404                 if (info->var.accel_flags) {
1405                         mutex_unlock(&info->mm_lock);
1406                         return -EINVAL;
1407                 }
1408
1409                 vma->vm_pgoff -= mmio_pgoff;
1410                 start = info->fix.mmio_start;
1411                 len = info->fix.mmio_len;
1412         }
1413         mutex_unlock(&info->mm_lock);
1414
1415         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1416         fb_pgprotect(file, vma, start);
1417
1418         return vm_iomap_memory(vma, start, len);
1419 }
1420
1421 static int
1422 fb_open(struct inode *inode, struct file *file)
1423 __acquires(&info->lock)
1424 __releases(&info->lock)
1425 {
1426         int fbidx = iminor(inode);
1427         struct fb_info *info;
1428         int res = 0;
1429
1430         info = get_fb_info(fbidx);
1431         if (!info) {
1432                 request_module("fb%d", fbidx);
1433                 info = get_fb_info(fbidx);
1434                 if (!info)
1435                         return -ENODEV;
1436         }
1437         if (IS_ERR(info))
1438                 return PTR_ERR(info);
1439
1440         mutex_lock(&info->lock);
1441         if (!try_module_get(info->fbops->owner)) {
1442                 res = -ENODEV;
1443                 goto out;
1444         }
1445         file->private_data = info;
1446         if (info->fbops->fb_open) {
1447                 res = info->fbops->fb_open(info,1);
1448                 if (res)
1449                         module_put(info->fbops->owner);
1450         }
1451 #ifdef CONFIG_FB_DEFERRED_IO
1452         if (info->fbdefio)
1453                 fb_deferred_io_open(info, inode, file);
1454 #endif
1455 out:
1456         mutex_unlock(&info->lock);
1457         if (res)
1458                 put_fb_info(info);
1459         return res;
1460 }
1461
1462 static int 
1463 fb_release(struct inode *inode, struct file *file)
1464 __acquires(&info->lock)
1465 __releases(&info->lock)
1466 {
1467         struct fb_info * const info = file->private_data;
1468
1469         mutex_lock(&info->lock);
1470         if (info->fbops->fb_release)
1471                 info->fbops->fb_release(info,1);
1472         module_put(info->fbops->owner);
1473         mutex_unlock(&info->lock);
1474         put_fb_info(info);
1475         return 0;
1476 }
1477
1478 static const struct file_operations fb_fops = {
1479         .owner =        THIS_MODULE,
1480         .read =         fb_read,
1481         .write =        fb_write,
1482         .unlocked_ioctl = fb_ioctl,
1483 #ifdef CONFIG_COMPAT
1484         .compat_ioctl = fb_compat_ioctl,
1485 #endif
1486         .mmap =         fb_mmap,
1487         .open =         fb_open,
1488         .release =      fb_release,
1489 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1490         .get_unmapped_area = get_fb_unmapped_area,
1491 #endif
1492 #ifdef CONFIG_FB_DEFERRED_IO
1493         .fsync =        fb_deferred_io_fsync,
1494 #endif
1495         .llseek =       default_llseek,
1496 };
1497
1498 struct class *fb_class;
1499 EXPORT_SYMBOL(fb_class);
1500
1501 static int fb_check_foreignness(struct fb_info *fi)
1502 {
1503         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1504
1505         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1506
1507 #ifdef __BIG_ENDIAN
1508         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1509 #else
1510         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1511 #endif /* __BIG_ENDIAN */
1512
1513         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1514                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1515                        "support this framebuffer\n", fi->fix.id);
1516                 return -ENOSYS;
1517         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1518                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1519                        "support this framebuffer\n", fi->fix.id);
1520                 return -ENOSYS;
1521         }
1522
1523         return 0;
1524 }
1525
1526 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1527 {
1528         /* is the generic aperture base the same as the HW one */
1529         if (gen->base == hw->base)
1530                 return true;
1531         /* is the generic aperture base inside the hw base->hw base+size */
1532         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1533                 return true;
1534         return false;
1535 }
1536
1537 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1538                                     struct apertures_struct *hwa)
1539 {
1540         int i, j;
1541         if (!hwa || !gena)
1542                 return false;
1543
1544         for (i = 0; i < hwa->count; ++i) {
1545                 struct aperture *h = &hwa->ranges[i];
1546                 for (j = 0; j < gena->count; ++j) {
1547                         struct aperture *g = &gena->ranges[j];
1548                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1549                                 (unsigned long long)g->base,
1550                                 (unsigned long long)g->size,
1551                                 (unsigned long long)h->base,
1552                                 (unsigned long long)h->size);
1553                         if (apertures_overlap(g, h))
1554                                 return true;
1555                 }
1556         }
1557
1558         return false;
1559 }
1560
1561 static int do_unregister_framebuffer(struct fb_info *fb_info);
1562
1563 #define VGA_FB_PHYS 0xA0000
1564 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1565                                      const char *name, bool primary)
1566 {
1567         int i;
1568
1569         /* check all firmware fbs and kick off if the base addr overlaps */
1570         for (i = 0 ; i < FB_MAX; i++) {
1571                 struct apertures_struct *gen_aper;
1572                 if (!registered_fb[i])
1573                         continue;
1574
1575                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1576                         continue;
1577
1578                 gen_aper = registered_fb[i]->apertures;
1579                 if (fb_do_apertures_overlap(gen_aper, a) ||
1580                         (primary && gen_aper && gen_aper->count &&
1581                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1582
1583                         printk(KERN_INFO "fb: conflicting fb hw usage "
1584                                "%s vs %s - removing generic driver\n",
1585                                name, registered_fb[i]->fix.id);
1586                         do_unregister_framebuffer(registered_fb[i]);
1587                 }
1588         }
1589 }
1590
1591 static int do_register_framebuffer(struct fb_info *fb_info)
1592 {
1593         int i;
1594         struct fb_event event;
1595         struct fb_videomode mode;
1596
1597         if (fb_check_foreignness(fb_info))
1598                 return -ENOSYS;
1599
1600         do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1601                                          fb_is_primary_device(fb_info));
1602
1603         if (num_registered_fb == FB_MAX)
1604                 return -ENXIO;
1605
1606         num_registered_fb++;
1607         for (i = 0 ; i < FB_MAX; i++)
1608                 if (!registered_fb[i])
1609                         break;
1610         fb_info->node = i;
1611         atomic_set(&fb_info->count, 1);
1612         mutex_init(&fb_info->lock);
1613         mutex_init(&fb_info->mm_lock);
1614
1615         fb_info->dev = device_create(fb_class, fb_info->device,
1616                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1617         if (IS_ERR(fb_info->dev)) {
1618                 /* Not fatal */
1619                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1620                 fb_info->dev = NULL;
1621         } else
1622                 fb_init_device(fb_info);
1623
1624         if (fb_info->pixmap.addr == NULL) {
1625                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1626                 if (fb_info->pixmap.addr) {
1627                         fb_info->pixmap.size = FBPIXMAPSIZE;
1628                         fb_info->pixmap.buf_align = 1;
1629                         fb_info->pixmap.scan_align = 1;
1630                         fb_info->pixmap.access_align = 32;
1631                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1632                 }
1633         }       
1634         fb_info->pixmap.offset = 0;
1635
1636         if (!fb_info->pixmap.blit_x)
1637                 fb_info->pixmap.blit_x = ~(u32)0;
1638
1639         if (!fb_info->pixmap.blit_y)
1640                 fb_info->pixmap.blit_y = ~(u32)0;
1641
1642         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1643                 INIT_LIST_HEAD(&fb_info->modelist);
1644
1645         if (fb_info->skip_vt_switch)
1646                 pm_vt_switch_required(fb_info->dev, false);
1647         else
1648                 pm_vt_switch_required(fb_info->dev, true);
1649
1650         fb_var_to_videomode(&mode, &fb_info->var);
1651         fb_add_videomode(&mode, &fb_info->modelist);
1652         registered_fb[i] = fb_info;
1653
1654         event.info = fb_info;
1655         if (!lock_fb_info(fb_info))
1656                 return -ENODEV;
1657         console_lock();
1658         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1659         console_unlock();
1660         unlock_fb_info(fb_info);
1661         return 0;
1662 }
1663
1664 static int do_unregister_framebuffer(struct fb_info *fb_info)
1665 {
1666         struct fb_event event;
1667         int i, ret = 0;
1668
1669         i = fb_info->node;
1670         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1671                 return -EINVAL;
1672
1673         if (!lock_fb_info(fb_info))
1674                 return -ENODEV;
1675         console_lock();
1676         event.info = fb_info;
1677         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1678         console_unlock();
1679         unlock_fb_info(fb_info);
1680
1681         if (ret)
1682                 return -EINVAL;
1683
1684         pm_vt_switch_unregister(fb_info->dev);
1685
1686         unlink_framebuffer(fb_info);
1687         if (fb_info->pixmap.addr &&
1688             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1689                 kfree(fb_info->pixmap.addr);
1690         fb_destroy_modelist(&fb_info->modelist);
1691         registered_fb[i] = NULL;
1692         num_registered_fb--;
1693         fb_cleanup_device(fb_info);
1694         event.info = fb_info;
1695         console_lock();
1696         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1697         console_unlock();
1698
1699         /* this may free fb info */
1700         put_fb_info(fb_info);
1701         return 0;
1702 }
1703
1704 int unlink_framebuffer(struct fb_info *fb_info)
1705 {
1706         int i;
1707
1708         i = fb_info->node;
1709         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1710                 return -EINVAL;
1711
1712         if (fb_info->dev) {
1713                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1714                 fb_info->dev = NULL;
1715         }
1716         return 0;
1717 }
1718 EXPORT_SYMBOL(unlink_framebuffer);
1719
1720 void remove_conflicting_framebuffers(struct apertures_struct *a,
1721                                      const char *name, bool primary)
1722 {
1723         mutex_lock(&registration_lock);
1724         do_remove_conflicting_framebuffers(a, name, primary);
1725         mutex_unlock(&registration_lock);
1726 }
1727 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1728
1729 /**
1730  *      register_framebuffer - registers a frame buffer device
1731  *      @fb_info: frame buffer info structure
1732  *
1733  *      Registers a frame buffer device @fb_info.
1734  *
1735  *      Returns negative errno on error, or zero for success.
1736  *
1737  */
1738 int
1739 register_framebuffer(struct fb_info *fb_info)
1740 {
1741         int ret;
1742
1743         mutex_lock(&registration_lock);
1744         ret = do_register_framebuffer(fb_info);
1745         mutex_unlock(&registration_lock);
1746
1747         return ret;
1748 }
1749
1750 /**
1751  *      unregister_framebuffer - releases a frame buffer device
1752  *      @fb_info: frame buffer info structure
1753  *
1754  *      Unregisters a frame buffer device @fb_info.
1755  *
1756  *      Returns negative errno on error, or zero for success.
1757  *
1758  *      This function will also notify the framebuffer console
1759  *      to release the driver.
1760  *
1761  *      This is meant to be called within a driver's module_exit()
1762  *      function. If this is called outside module_exit(), ensure
1763  *      that the driver implements fb_open() and fb_release() to
1764  *      check that no processes are using the device.
1765  */
1766 int
1767 unregister_framebuffer(struct fb_info *fb_info)
1768 {
1769         int ret;
1770
1771         mutex_lock(&registration_lock);
1772         ret = do_unregister_framebuffer(fb_info);
1773         mutex_unlock(&registration_lock);
1774
1775         return ret;
1776 }
1777
1778 /**
1779  *      fb_set_suspend - low level driver signals suspend
1780  *      @info: framebuffer affected
1781  *      @state: 0 = resuming, !=0 = suspending
1782  *
1783  *      This is meant to be used by low level drivers to
1784  *      signal suspend/resume to the core & clients.
1785  *      It must be called with the console semaphore held
1786  */
1787 void fb_set_suspend(struct fb_info *info, int state)
1788 {
1789         struct fb_event event;
1790
1791         event.info = info;
1792         if (state) {
1793                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1794                 info->state = FBINFO_STATE_SUSPENDED;
1795         } else {
1796                 info->state = FBINFO_STATE_RUNNING;
1797                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1798         }
1799 }
1800
1801 /**
1802  *      fbmem_init - init frame buffer subsystem
1803  *
1804  *      Initialize the frame buffer subsystem.
1805  *
1806  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1807  *
1808  */
1809
1810 static int __init
1811 fbmem_init(void)
1812 {
1813         proc_create("fb", 0, NULL, &fb_proc_fops);
1814
1815         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1816                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1817
1818         fb_class = class_create(THIS_MODULE, "graphics");
1819         if (IS_ERR(fb_class)) {
1820                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1821                 fb_class = NULL;
1822         }
1823         return 0;
1824 }
1825
1826 #ifdef MODULE
1827 module_init(fbmem_init);
1828 static void __exit
1829 fbmem_exit(void)
1830 {
1831         remove_proc_entry("fb", NULL);
1832         class_destroy(fb_class);
1833         unregister_chrdev(FB_MAJOR, "fb");
1834 }
1835
1836 module_exit(fbmem_exit);
1837 MODULE_LICENSE("GPL");
1838 MODULE_DESCRIPTION("Framebuffer base");
1839 #else
1840 subsys_initcall(fbmem_init);
1841 #endif
1842
1843 int fb_new_modelist(struct fb_info *info)
1844 {
1845         struct fb_event event;
1846         struct fb_var_screeninfo var = info->var;
1847         struct list_head *pos, *n;
1848         struct fb_modelist *modelist;
1849         struct fb_videomode *m, mode;
1850         int err = 1;
1851
1852         list_for_each_safe(pos, n, &info->modelist) {
1853                 modelist = list_entry(pos, struct fb_modelist, list);
1854                 m = &modelist->mode;
1855                 fb_videomode_to_var(&var, m);
1856                 var.activate = FB_ACTIVATE_TEST;
1857                 err = fb_set_var(info, &var);
1858                 fb_var_to_videomode(&mode, &var);
1859                 if (err || !fb_mode_is_equal(m, &mode)) {
1860                         list_del(pos);
1861                         kfree(pos);
1862                 }
1863         }
1864
1865         err = 1;
1866
1867         if (!list_empty(&info->modelist)) {
1868                 event.info = info;
1869                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1870         }
1871
1872         return err;
1873 }
1874
1875 static char *video_options[FB_MAX] __read_mostly;
1876 static int ofonly __read_mostly;
1877
1878 /**
1879  * fb_get_options - get kernel boot parameters
1880  * @name:   framebuffer name as it would appear in
1881  *          the boot parameter line
1882  *          (video=<name>:<options>)
1883  * @option: the option will be stored here
1884  *
1885  * NOTE: Needed to maintain backwards compatibility
1886  */
1887 int fb_get_options(char *name, char **option)
1888 {
1889         char *opt, *options = NULL;
1890         int retval = 0;
1891         int name_len = strlen(name), i;
1892
1893         if (name_len && ofonly && strncmp(name, "offb", 4))
1894                 retval = 1;
1895
1896         if (name_len && !retval) {
1897                 for (i = 0; i < FB_MAX; i++) {
1898                         if (video_options[i] == NULL)
1899                                 continue;
1900                         if (!video_options[i][0])
1901                                 continue;
1902                         opt = video_options[i];
1903                         if (!strncmp(name, opt, name_len) &&
1904                             opt[name_len] == ':')
1905                                 options = opt + name_len + 1;
1906                 }
1907         }
1908         if (options && !strncmp(options, "off", 3))
1909                 retval = 1;
1910
1911         if (option)
1912                 *option = options;
1913
1914         return retval;
1915 }
1916
1917 #ifndef MODULE
1918 /**
1919  *      video_setup - process command line options
1920  *      @options: string of options
1921  *
1922  *      Process command line options for frame buffer subsystem.
1923  *
1924  *      NOTE: This function is a __setup and __init function.
1925  *            It only stores the options.  Drivers have to call
1926  *            fb_get_options() as necessary.
1927  *
1928  *      Returns zero.
1929  *
1930  */
1931 static int __init video_setup(char *options)
1932 {
1933         int i, global = 0;
1934
1935         if (!options || !*options)
1936                 global = 1;
1937
1938         if (!global && !strncmp(options, "ofonly", 6)) {
1939                 ofonly = 1;
1940                 global = 1;
1941         }
1942
1943         if (!global && !strchr(options, ':')) {
1944                 fb_mode_option = options;
1945                 global = 1;
1946         }
1947
1948         if (!global) {
1949                 for (i = 0; i < FB_MAX; i++) {
1950                         if (video_options[i] == NULL) {
1951                                 video_options[i] = options;
1952                                 break;
1953                         }
1954
1955                 }
1956         }
1957
1958         return 1;
1959 }
1960 __setup("video=", video_setup);
1961 #endif
1962
1963     /*
1964      *  Visible symbols for modules
1965      */
1966
1967 EXPORT_SYMBOL(register_framebuffer);
1968 EXPORT_SYMBOL(unregister_framebuffer);
1969 EXPORT_SYMBOL(num_registered_fb);
1970 EXPORT_SYMBOL(registered_fb);
1971 EXPORT_SYMBOL(fb_show_logo);
1972 EXPORT_SYMBOL(fb_set_var);
1973 EXPORT_SYMBOL(fb_blank);
1974 EXPORT_SYMBOL(fb_pan_display);
1975 EXPORT_SYMBOL(fb_get_buffer_offset);
1976 EXPORT_SYMBOL(fb_set_suspend);
1977 EXPORT_SYMBOL(fb_get_options);
1978
1979 MODULE_LICENSE("GPL");