Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
[linux-2.6.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->f_path.dentry->d_inode;
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                 if (!info->fbops->fb_check_var) {
971                         *var = info->var;
972                         goto done;
973                 }
974
975                 ret = info->fbops->fb_check_var(var, info);
976
977                 if (ret)
978                         goto done;
979
980                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
981                         struct fb_var_screeninfo old_var;
982                         struct fb_videomode mode;
983
984                         if (info->fbops->fb_get_caps) {
985                                 ret = fb_check_caps(info, var, activate);
986
987                                 if (ret)
988                                         goto done;
989                         }
990
991                         old_var = info->var;
992                         info->var = *var;
993
994                         if (info->fbops->fb_set_par) {
995                                 ret = info->fbops->fb_set_par(info);
996
997                                 if (ret) {
998                                         info->var = old_var;
999                                         printk(KERN_WARNING "detected "
1000                                                 "fb_set_par error, "
1001                                                 "error code: %d\n", ret);
1002                                         goto done;
1003                                 }
1004                         }
1005
1006                         fb_pan_display(info, &info->var);
1007                         fb_set_cmap(&info->cmap, info);
1008                         fb_var_to_videomode(&mode, &info->var);
1009
1010                         if (info->modelist.prev && info->modelist.next &&
1011                             !list_empty(&info->modelist))
1012                                 ret = fb_add_videomode(&mode, &info->modelist);
1013
1014                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1015                                 struct fb_event event;
1016                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1017                                         FB_EVENT_MODE_CHANGE_ALL :
1018                                         FB_EVENT_MODE_CHANGE;
1019
1020                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1021                                 event.info = info;
1022                                 event.data = &mode;
1023                                 fb_notifier_call_chain(evnt, &event);
1024                         }
1025                 }
1026         }
1027
1028  done:
1029         return ret;
1030 }
1031
1032 int
1033 fb_blank(struct fb_info *info, int blank)
1034 {       
1035         int ret = -EINVAL;
1036
1037         if (blank > FB_BLANK_POWERDOWN)
1038                 blank = FB_BLANK_POWERDOWN;
1039
1040         if (info->fbops->fb_blank)
1041                 ret = info->fbops->fb_blank(blank, info);
1042
1043         if (!ret) {
1044                 struct fb_event event;
1045
1046                 event.info = info;
1047                 event.data = &blank;
1048                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1049         }
1050
1051         return ret;
1052 }
1053
1054 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1055                         unsigned long arg)
1056 {
1057         struct fb_ops *fb;
1058         struct fb_var_screeninfo var;
1059         struct fb_fix_screeninfo fix;
1060         struct fb_con2fbmap con2fb;
1061         struct fb_cmap cmap_from;
1062         struct fb_cmap_user cmap;
1063         struct fb_event event;
1064         void __user *argp = (void __user *)arg;
1065         long ret = 0;
1066
1067         switch (cmd) {
1068         case FBIOGET_VSCREENINFO:
1069                 if (!lock_fb_info(info))
1070                         return -ENODEV;
1071                 var = info->var;
1072                 unlock_fb_info(info);
1073
1074                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1075                 break;
1076         case FBIOPUT_VSCREENINFO:
1077                 if (copy_from_user(&var, argp, sizeof(var)))
1078                         return -EFAULT;
1079                 if (!lock_fb_info(info))
1080                         return -ENODEV;
1081                 console_lock();
1082                 info->flags |= FBINFO_MISC_USEREVENT;
1083                 ret = fb_set_var(info, &var);
1084                 info->flags &= ~FBINFO_MISC_USEREVENT;
1085                 console_unlock();
1086                 unlock_fb_info(info);
1087                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1088                         ret = -EFAULT;
1089                 break;
1090         case FBIOGET_FSCREENINFO:
1091                 if (!lock_fb_info(info))
1092                         return -ENODEV;
1093                 fix = info->fix;
1094                 unlock_fb_info(info);
1095
1096                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1097                 break;
1098         case FBIOPUTCMAP:
1099                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1100                         return -EFAULT;
1101                 ret = fb_set_user_cmap(&cmap, info);
1102                 break;
1103         case FBIOGETCMAP:
1104                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1105                         return -EFAULT;
1106                 if (!lock_fb_info(info))
1107                         return -ENODEV;
1108                 cmap_from = info->cmap;
1109                 unlock_fb_info(info);
1110                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1111                 break;
1112         case FBIOPAN_DISPLAY:
1113                 if (copy_from_user(&var, argp, sizeof(var)))
1114                         return -EFAULT;
1115                 if (!lock_fb_info(info))
1116                         return -ENODEV;
1117                 console_lock();
1118                 ret = fb_pan_display(info, &var);
1119                 console_unlock();
1120                 unlock_fb_info(info);
1121                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1122                         return -EFAULT;
1123                 break;
1124         case FBIO_CURSOR:
1125                 ret = -EINVAL;
1126                 break;
1127         case FBIOGET_CON2FBMAP:
1128                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1129                         return -EFAULT;
1130                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1131                         return -EINVAL;
1132                 con2fb.framebuffer = -1;
1133                 event.data = &con2fb;
1134                 if (!lock_fb_info(info))
1135                         return -ENODEV;
1136                 event.info = info;
1137                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1138                 unlock_fb_info(info);
1139                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1140                 break;
1141         case FBIOPUT_CON2FBMAP:
1142                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1143                         return -EFAULT;
1144                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1145                         return -EINVAL;
1146                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1147                         return -EINVAL;
1148                 if (!registered_fb[con2fb.framebuffer])
1149                         request_module("fb%d", con2fb.framebuffer);
1150                 if (!registered_fb[con2fb.framebuffer]) {
1151                         ret = -EINVAL;
1152                         break;
1153                 }
1154                 event.data = &con2fb;
1155                 if (!lock_fb_info(info))
1156                         return -ENODEV;
1157                 event.info = info;
1158                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1159                 unlock_fb_info(info);
1160                 break;
1161         case FBIOBLANK:
1162                 if (!lock_fb_info(info))
1163                         return -ENODEV;
1164                 console_lock();
1165                 info->flags |= FBINFO_MISC_USEREVENT;
1166                 ret = fb_blank(info, arg);
1167                 info->flags &= ~FBINFO_MISC_USEREVENT;
1168                 console_unlock();
1169                 unlock_fb_info(info);
1170                 break;
1171         default:
1172                 if (!lock_fb_info(info))
1173                         return -ENODEV;
1174                 fb = info->fbops;
1175                 if (fb->fb_ioctl)
1176                         ret = fb->fb_ioctl(info, cmd, arg);
1177                 else
1178                         ret = -ENOTTY;
1179                 unlock_fb_info(info);
1180         }
1181         return ret;
1182 }
1183
1184 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1185 {
1186         struct fb_info *info = file_fb_info(file);
1187
1188         if (!info)
1189                 return -ENODEV;
1190         return do_fb_ioctl(info, cmd, arg);
1191 }
1192
1193 #ifdef CONFIG_COMPAT
1194 struct fb_fix_screeninfo32 {
1195         char                    id[16];
1196         compat_caddr_t          smem_start;
1197         u32                     smem_len;
1198         u32                     type;
1199         u32                     type_aux;
1200         u32                     visual;
1201         u16                     xpanstep;
1202         u16                     ypanstep;
1203         u16                     ywrapstep;
1204         u32                     line_length;
1205         compat_caddr_t          mmio_start;
1206         u32                     mmio_len;
1207         u32                     accel;
1208         u16                     reserved[3];
1209 };
1210
1211 struct fb_cmap32 {
1212         u32                     start;
1213         u32                     len;
1214         compat_caddr_t  red;
1215         compat_caddr_t  green;
1216         compat_caddr_t  blue;
1217         compat_caddr_t  transp;
1218 };
1219
1220 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1221                           unsigned long arg)
1222 {
1223         struct fb_cmap_user __user *cmap;
1224         struct fb_cmap32 __user *cmap32;
1225         __u32 data;
1226         int err;
1227
1228         cmap = compat_alloc_user_space(sizeof(*cmap));
1229         cmap32 = compat_ptr(arg);
1230
1231         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1232                 return -EFAULT;
1233
1234         if (get_user(data, &cmap32->red) ||
1235             put_user(compat_ptr(data), &cmap->red) ||
1236             get_user(data, &cmap32->green) ||
1237             put_user(compat_ptr(data), &cmap->green) ||
1238             get_user(data, &cmap32->blue) ||
1239             put_user(compat_ptr(data), &cmap->blue) ||
1240             get_user(data, &cmap32->transp) ||
1241             put_user(compat_ptr(data), &cmap->transp))
1242                 return -EFAULT;
1243
1244         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1245
1246         if (!err) {
1247                 if (copy_in_user(&cmap32->start,
1248                                  &cmap->start,
1249                                  2 * sizeof(__u32)))
1250                         err = -EFAULT;
1251         }
1252         return err;
1253 }
1254
1255 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1256                                   struct fb_fix_screeninfo32 __user *fix32)
1257 {
1258         __u32 data;
1259         int err;
1260
1261         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1262
1263         data = (__u32) (unsigned long) fix->smem_start;
1264         err |= put_user(data, &fix32->smem_start);
1265
1266         err |= put_user(fix->smem_len, &fix32->smem_len);
1267         err |= put_user(fix->type, &fix32->type);
1268         err |= put_user(fix->type_aux, &fix32->type_aux);
1269         err |= put_user(fix->visual, &fix32->visual);
1270         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1271         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1272         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1273         err |= put_user(fix->line_length, &fix32->line_length);
1274
1275         data = (__u32) (unsigned long) fix->mmio_start;
1276         err |= put_user(data, &fix32->mmio_start);
1277
1278         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1279         err |= put_user(fix->accel, &fix32->accel);
1280         err |= copy_to_user(fix32->reserved, fix->reserved,
1281                             sizeof(fix->reserved));
1282
1283         return err;
1284 }
1285
1286 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1287                               unsigned long arg)
1288 {
1289         mm_segment_t old_fs;
1290         struct fb_fix_screeninfo fix;
1291         struct fb_fix_screeninfo32 __user *fix32;
1292         int err;
1293
1294         fix32 = compat_ptr(arg);
1295
1296         old_fs = get_fs();
1297         set_fs(KERNEL_DS);
1298         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1299         set_fs(old_fs);
1300
1301         if (!err)
1302                 err = do_fscreeninfo_to_user(&fix, fix32);
1303
1304         return err;
1305 }
1306
1307 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1308                             unsigned long arg)
1309 {
1310         struct fb_info *info = file_fb_info(file);
1311         struct fb_ops *fb;
1312         long ret = -ENOIOCTLCMD;
1313
1314         if (!info)
1315                 return -ENODEV;
1316         fb = info->fbops;
1317         switch(cmd) {
1318         case FBIOGET_VSCREENINFO:
1319         case FBIOPUT_VSCREENINFO:
1320         case FBIOPAN_DISPLAY:
1321         case FBIOGET_CON2FBMAP:
1322         case FBIOPUT_CON2FBMAP:
1323                 arg = (unsigned long) compat_ptr(arg);
1324         case FBIOBLANK:
1325                 ret = do_fb_ioctl(info, cmd, arg);
1326                 break;
1327
1328         case FBIOGET_FSCREENINFO:
1329                 ret = fb_get_fscreeninfo(info, cmd, arg);
1330                 break;
1331
1332         case FBIOGETCMAP:
1333         case FBIOPUTCMAP:
1334                 ret = fb_getput_cmap(info, cmd, arg);
1335                 break;
1336
1337         default:
1338                 if (fb->fb_compat_ioctl)
1339                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1340                 break;
1341         }
1342         return ret;
1343 }
1344 #endif
1345
1346 static int
1347 fb_mmap(struct file *file, struct vm_area_struct * vma)
1348 {
1349         struct fb_info *info = file_fb_info(file);
1350         struct fb_ops *fb;
1351         unsigned long off;
1352         unsigned long start;
1353         u32 len;
1354
1355         if (!info)
1356                 return -ENODEV;
1357         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1358                 return -EINVAL;
1359         off = vma->vm_pgoff << PAGE_SHIFT;
1360         fb = info->fbops;
1361         if (!fb)
1362                 return -ENODEV;
1363         mutex_lock(&info->mm_lock);
1364         if (fb->fb_mmap) {
1365                 int res;
1366                 res = fb->fb_mmap(info, vma);
1367                 mutex_unlock(&info->mm_lock);
1368                 return res;
1369         }
1370
1371         /* frame buffer memory */
1372         start = info->fix.smem_start;
1373         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1374         if (off >= len) {
1375                 /* memory mapped io */
1376                 off -= len;
1377                 if (info->var.accel_flags) {
1378                         mutex_unlock(&info->mm_lock);
1379                         return -EINVAL;
1380                 }
1381                 start = info->fix.mmio_start;
1382                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1383         }
1384         mutex_unlock(&info->mm_lock);
1385         start &= PAGE_MASK;
1386         if ((vma->vm_end - vma->vm_start + off) > len)
1387                 return -EINVAL;
1388         off += start;
1389         vma->vm_pgoff = off >> PAGE_SHIFT;
1390         /* This is an IO map - tell maydump to skip this VMA */
1391         vma->vm_flags |= VM_IO | VM_RESERVED;
1392         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1393         fb_pgprotect(file, vma, off);
1394         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1395                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1396                 return -EAGAIN;
1397         return 0;
1398 }
1399
1400 static int
1401 fb_open(struct inode *inode, struct file *file)
1402 __acquires(&info->lock)
1403 __releases(&info->lock)
1404 {
1405         int fbidx = iminor(inode);
1406         struct fb_info *info;
1407         int res = 0;
1408
1409         info = get_fb_info(fbidx);
1410         if (!info) {
1411                 request_module("fb%d", fbidx);
1412                 info = get_fb_info(fbidx);
1413                 if (!info)
1414                         return -ENODEV;
1415         }
1416         if (IS_ERR(info))
1417                 return PTR_ERR(info);
1418
1419         mutex_lock(&info->lock);
1420         if (!try_module_get(info->fbops->owner)) {
1421                 res = -ENODEV;
1422                 goto out;
1423         }
1424         file->private_data = info;
1425         if (info->fbops->fb_open) {
1426                 res = info->fbops->fb_open(info,1);
1427                 if (res)
1428                         module_put(info->fbops->owner);
1429         }
1430 #ifdef CONFIG_FB_DEFERRED_IO
1431         if (info->fbdefio)
1432                 fb_deferred_io_open(info, inode, file);
1433 #endif
1434 out:
1435         mutex_unlock(&info->lock);
1436         if (res)
1437                 put_fb_info(info);
1438         return res;
1439 }
1440
1441 static int 
1442 fb_release(struct inode *inode, struct file *file)
1443 __acquires(&info->lock)
1444 __releases(&info->lock)
1445 {
1446         struct fb_info * const info = file->private_data;
1447
1448         mutex_lock(&info->lock);
1449         if (info->fbops->fb_release)
1450                 info->fbops->fb_release(info,1);
1451         module_put(info->fbops->owner);
1452         mutex_unlock(&info->lock);
1453         put_fb_info(info);
1454         return 0;
1455 }
1456
1457 static const struct file_operations fb_fops = {
1458         .owner =        THIS_MODULE,
1459         .read =         fb_read,
1460         .write =        fb_write,
1461         .unlocked_ioctl = fb_ioctl,
1462 #ifdef CONFIG_COMPAT
1463         .compat_ioctl = fb_compat_ioctl,
1464 #endif
1465         .mmap =         fb_mmap,
1466         .open =         fb_open,
1467         .release =      fb_release,
1468 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1469         .get_unmapped_area = get_fb_unmapped_area,
1470 #endif
1471 #ifdef CONFIG_FB_DEFERRED_IO
1472         .fsync =        fb_deferred_io_fsync,
1473 #endif
1474         .llseek =       default_llseek,
1475 };
1476
1477 struct class *fb_class;
1478 EXPORT_SYMBOL(fb_class);
1479
1480 static int fb_check_foreignness(struct fb_info *fi)
1481 {
1482         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1483
1484         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1485
1486 #ifdef __BIG_ENDIAN
1487         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1488 #else
1489         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1490 #endif /* __BIG_ENDIAN */
1491
1492         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1493                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1494                        "support this framebuffer\n", fi->fix.id);
1495                 return -ENOSYS;
1496         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1497                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1498                        "support this framebuffer\n", fi->fix.id);
1499                 return -ENOSYS;
1500         }
1501
1502         return 0;
1503 }
1504
1505 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1506 {
1507         /* is the generic aperture base the same as the HW one */
1508         if (gen->base == hw->base)
1509                 return true;
1510         /* is the generic aperture base inside the hw base->hw base+size */
1511         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1512                 return true;
1513         return false;
1514 }
1515
1516 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1517                                     struct apertures_struct *hwa)
1518 {
1519         int i, j;
1520         if (!hwa || !gena)
1521                 return false;
1522
1523         for (i = 0; i < hwa->count; ++i) {
1524                 struct aperture *h = &hwa->ranges[i];
1525                 for (j = 0; j < gena->count; ++j) {
1526                         struct aperture *g = &gena->ranges[j];
1527                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1528                                 (unsigned long long)g->base,
1529                                 (unsigned long long)g->size,
1530                                 (unsigned long long)h->base,
1531                                 (unsigned long long)h->size);
1532                         if (apertures_overlap(g, h))
1533                                 return true;
1534                 }
1535         }
1536
1537         return false;
1538 }
1539
1540 static int do_unregister_framebuffer(struct fb_info *fb_info);
1541
1542 #define VGA_FB_PHYS 0xA0000
1543 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1544                                      const char *name, bool primary)
1545 {
1546         int i;
1547
1548         /* check all firmware fbs and kick off if the base addr overlaps */
1549         for (i = 0 ; i < FB_MAX; i++) {
1550                 struct apertures_struct *gen_aper;
1551                 if (!registered_fb[i])
1552                         continue;
1553
1554                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1555                         continue;
1556
1557                 gen_aper = registered_fb[i]->apertures;
1558                 if (fb_do_apertures_overlap(gen_aper, a) ||
1559                         (primary && gen_aper && gen_aper->count &&
1560                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1561
1562                         printk(KERN_INFO "fb: conflicting fb hw usage "
1563                                "%s vs %s - removing generic driver\n",
1564                                name, registered_fb[i]->fix.id);
1565                         do_unregister_framebuffer(registered_fb[i]);
1566                 }
1567         }
1568 }
1569
1570 static int do_register_framebuffer(struct fb_info *fb_info)
1571 {
1572         int i;
1573         struct fb_event event;
1574         struct fb_videomode mode;
1575
1576         if (fb_check_foreignness(fb_info))
1577                 return -ENOSYS;
1578
1579         do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1580                                          fb_is_primary_device(fb_info));
1581
1582         if (num_registered_fb == FB_MAX)
1583                 return -ENXIO;
1584
1585         num_registered_fb++;
1586         for (i = 0 ; i < FB_MAX; i++)
1587                 if (!registered_fb[i])
1588                         break;
1589         fb_info->node = i;
1590         atomic_set(&fb_info->count, 1);
1591         mutex_init(&fb_info->lock);
1592         mutex_init(&fb_info->mm_lock);
1593
1594         fb_info->dev = device_create(fb_class, fb_info->device,
1595                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1596         if (IS_ERR(fb_info->dev)) {
1597                 /* Not fatal */
1598                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1599                 fb_info->dev = NULL;
1600         } else
1601                 fb_init_device(fb_info);
1602
1603         if (fb_info->pixmap.addr == NULL) {
1604                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1605                 if (fb_info->pixmap.addr) {
1606                         fb_info->pixmap.size = FBPIXMAPSIZE;
1607                         fb_info->pixmap.buf_align = 1;
1608                         fb_info->pixmap.scan_align = 1;
1609                         fb_info->pixmap.access_align = 32;
1610                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1611                 }
1612         }       
1613         fb_info->pixmap.offset = 0;
1614
1615         if (!fb_info->pixmap.blit_x)
1616                 fb_info->pixmap.blit_x = ~(u32)0;
1617
1618         if (!fb_info->pixmap.blit_y)
1619                 fb_info->pixmap.blit_y = ~(u32)0;
1620
1621         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1622                 INIT_LIST_HEAD(&fb_info->modelist);
1623
1624         fb_var_to_videomode(&mode, &fb_info->var);
1625         fb_add_videomode(&mode, &fb_info->modelist);
1626         registered_fb[i] = fb_info;
1627
1628         event.info = fb_info;
1629         if (!lock_fb_info(fb_info))
1630                 return -ENODEV;
1631         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1632         unlock_fb_info(fb_info);
1633         return 0;
1634 }
1635
1636 static int do_unregister_framebuffer(struct fb_info *fb_info)
1637 {
1638         struct fb_event event;
1639         int i, ret = 0;
1640
1641         i = fb_info->node;
1642         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1643                 return -EINVAL;
1644
1645         if (!lock_fb_info(fb_info))
1646                 return -ENODEV;
1647         event.info = fb_info;
1648         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1649         unlock_fb_info(fb_info);
1650
1651         if (ret)
1652                 return -EINVAL;
1653
1654         if (fb_info->pixmap.addr &&
1655             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1656                 kfree(fb_info->pixmap.addr);
1657         fb_destroy_modelist(&fb_info->modelist);
1658         registered_fb[i] = NULL;
1659         num_registered_fb--;
1660         fb_cleanup_device(fb_info);
1661         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1662         event.info = fb_info;
1663         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1664
1665         /* this may free fb info */
1666         put_fb_info(fb_info);
1667         return 0;
1668 }
1669
1670 void remove_conflicting_framebuffers(struct apertures_struct *a,
1671                                      const char *name, bool primary)
1672 {
1673         mutex_lock(&registration_lock);
1674         do_remove_conflicting_framebuffers(a, name, primary);
1675         mutex_unlock(&registration_lock);
1676 }
1677 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1678
1679 /**
1680  *      register_framebuffer - registers a frame buffer device
1681  *      @fb_info: frame buffer info structure
1682  *
1683  *      Registers a frame buffer device @fb_info.
1684  *
1685  *      Returns negative errno on error, or zero for success.
1686  *
1687  */
1688 int
1689 register_framebuffer(struct fb_info *fb_info)
1690 {
1691         int ret;
1692
1693         mutex_lock(&registration_lock);
1694         ret = do_register_framebuffer(fb_info);
1695         mutex_unlock(&registration_lock);
1696
1697         return ret;
1698 }
1699
1700 /**
1701  *      unregister_framebuffer - releases a frame buffer device
1702  *      @fb_info: frame buffer info structure
1703  *
1704  *      Unregisters a frame buffer device @fb_info.
1705  *
1706  *      Returns negative errno on error, or zero for success.
1707  *
1708  *      This function will also notify the framebuffer console
1709  *      to release the driver.
1710  *
1711  *      This is meant to be called within a driver's module_exit()
1712  *      function. If this is called outside module_exit(), ensure
1713  *      that the driver implements fb_open() and fb_release() to
1714  *      check that no processes are using the device.
1715  */
1716 int
1717 unregister_framebuffer(struct fb_info *fb_info)
1718 {
1719         int ret;
1720
1721         mutex_lock(&registration_lock);
1722         ret = do_unregister_framebuffer(fb_info);
1723         mutex_unlock(&registration_lock);
1724
1725         return ret;
1726 }
1727
1728 /**
1729  *      fb_set_suspend - low level driver signals suspend
1730  *      @info: framebuffer affected
1731  *      @state: 0 = resuming, !=0 = suspending
1732  *
1733  *      This is meant to be used by low level drivers to
1734  *      signal suspend/resume to the core & clients.
1735  *      It must be called with the console semaphore held
1736  */
1737 void fb_set_suspend(struct fb_info *info, int state)
1738 {
1739         struct fb_event event;
1740
1741         if (!lock_fb_info(info))
1742                 return;
1743         event.info = info;
1744         if (state) {
1745                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1746                 info->state = FBINFO_STATE_SUSPENDED;
1747         } else {
1748                 info->state = FBINFO_STATE_RUNNING;
1749                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1750         }
1751         unlock_fb_info(info);
1752 }
1753
1754 /**
1755  *      fbmem_init - init frame buffer subsystem
1756  *
1757  *      Initialize the frame buffer subsystem.
1758  *
1759  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1760  *
1761  */
1762
1763 static int __init
1764 fbmem_init(void)
1765 {
1766         proc_create("fb", 0, NULL, &fb_proc_fops);
1767
1768         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1769                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1770
1771         fb_class = class_create(THIS_MODULE, "graphics");
1772         if (IS_ERR(fb_class)) {
1773                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1774                 fb_class = NULL;
1775         }
1776         return 0;
1777 }
1778
1779 #ifdef MODULE
1780 module_init(fbmem_init);
1781 static void __exit
1782 fbmem_exit(void)
1783 {
1784         remove_proc_entry("fb", NULL);
1785         class_destroy(fb_class);
1786         unregister_chrdev(FB_MAJOR, "fb");
1787 }
1788
1789 module_exit(fbmem_exit);
1790 MODULE_LICENSE("GPL");
1791 MODULE_DESCRIPTION("Framebuffer base");
1792 #else
1793 subsys_initcall(fbmem_init);
1794 #endif
1795
1796 int fb_new_modelist(struct fb_info *info)
1797 {
1798         struct fb_event event;
1799         struct fb_var_screeninfo var = info->var;
1800         struct list_head *pos, *n;
1801         struct fb_modelist *modelist;
1802         struct fb_videomode *m, mode;
1803         int err = 1;
1804
1805         list_for_each_safe(pos, n, &info->modelist) {
1806                 modelist = list_entry(pos, struct fb_modelist, list);
1807                 m = &modelist->mode;
1808                 fb_videomode_to_var(&var, m);
1809                 var.activate = FB_ACTIVATE_TEST;
1810                 err = fb_set_var(info, &var);
1811                 fb_var_to_videomode(&mode, &var);
1812                 if (err || !fb_mode_is_equal(m, &mode)) {
1813                         list_del(pos);
1814                         kfree(pos);
1815                 }
1816         }
1817
1818         err = 1;
1819
1820         if (!list_empty(&info->modelist)) {
1821                 if (!lock_fb_info(info))
1822                         return -ENODEV;
1823                 event.info = info;
1824                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1825                 unlock_fb_info(info);
1826         }
1827
1828         return err;
1829 }
1830
1831 static char *video_options[FB_MAX] __read_mostly;
1832 static int ofonly __read_mostly;
1833
1834 /**
1835  * fb_get_options - get kernel boot parameters
1836  * @name:   framebuffer name as it would appear in
1837  *          the boot parameter line
1838  *          (video=<name>:<options>)
1839  * @option: the option will be stored here
1840  *
1841  * NOTE: Needed to maintain backwards compatibility
1842  */
1843 int fb_get_options(char *name, char **option)
1844 {
1845         char *opt, *options = NULL;
1846         int retval = 0;
1847         int name_len = strlen(name), i;
1848
1849         if (name_len && ofonly && strncmp(name, "offb", 4))
1850                 retval = 1;
1851
1852         if (name_len && !retval) {
1853                 for (i = 0; i < FB_MAX; i++) {
1854                         if (video_options[i] == NULL)
1855                                 continue;
1856                         if (!video_options[i][0])
1857                                 continue;
1858                         opt = video_options[i];
1859                         if (!strncmp(name, opt, name_len) &&
1860                             opt[name_len] == ':')
1861                                 options = opt + name_len + 1;
1862                 }
1863         }
1864         if (options && !strncmp(options, "off", 3))
1865                 retval = 1;
1866
1867         if (option)
1868                 *option = options;
1869
1870         return retval;
1871 }
1872
1873 #ifndef MODULE
1874 /**
1875  *      video_setup - process command line options
1876  *      @options: string of options
1877  *
1878  *      Process command line options for frame buffer subsystem.
1879  *
1880  *      NOTE: This function is a __setup and __init function.
1881  *            It only stores the options.  Drivers have to call
1882  *            fb_get_options() as necessary.
1883  *
1884  *      Returns zero.
1885  *
1886  */
1887 static int __init video_setup(char *options)
1888 {
1889         int i, global = 0;
1890
1891         if (!options || !*options)
1892                 global = 1;
1893
1894         if (!global && !strncmp(options, "ofonly", 6)) {
1895                 ofonly = 1;
1896                 global = 1;
1897         }
1898
1899         if (!global && !strchr(options, ':')) {
1900                 fb_mode_option = options;
1901                 global = 1;
1902         }
1903
1904         if (!global) {
1905                 for (i = 0; i < FB_MAX; i++) {
1906                         if (video_options[i] == NULL) {
1907                                 video_options[i] = options;
1908                                 break;
1909                         }
1910
1911                 }
1912         }
1913
1914         return 1;
1915 }
1916 __setup("video=", video_setup);
1917 #endif
1918
1919     /*
1920      *  Visible symbols for modules
1921      */
1922
1923 EXPORT_SYMBOL(register_framebuffer);
1924 EXPORT_SYMBOL(unregister_framebuffer);
1925 EXPORT_SYMBOL(num_registered_fb);
1926 EXPORT_SYMBOL(registered_fb);
1927 EXPORT_SYMBOL(fb_show_logo);
1928 EXPORT_SYMBOL(fb_set_var);
1929 EXPORT_SYMBOL(fb_blank);
1930 EXPORT_SYMBOL(fb_pan_display);
1931 EXPORT_SYMBOL(fb_get_buffer_offset);
1932 EXPORT_SYMBOL(fb_set_suspend);
1933 EXPORT_SYMBOL(fb_get_options);
1934
1935 MODULE_LICENSE("GPL");