Input: drop redundant includes of moduleparam.h
[linux-2.6] / 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/smp_lock.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/mman.h>
25 #include <linux/vt.h>
26 #include <linux/init.h>
27 #include <linux/linux_logo.h>
28 #include <linux/proc_fs.h>
29 #include <linux/console.h>
30 #ifdef CONFIG_KMOD
31 #include <linux/kmod.h>
32 #endif
33 #include <linux/err.h>
34 #include <linux/device.h>
35 #include <linux/efi.h>
36 #include <linux/fb.h>
37
38 #include <asm/fb.h>
39
40
41     /*
42      *  Frame buffer device initialization and setup routines
43      */
44
45 #define FBPIXMAPSIZE    (1024 * 8)
46
47 struct fb_info *registered_fb[FB_MAX] __read_mostly;
48 int num_registered_fb __read_mostly;
49
50 /*
51  * Helpers
52  */
53
54 int fb_get_color_depth(struct fb_var_screeninfo *var,
55                        struct fb_fix_screeninfo *fix)
56 {
57         int depth = 0;
58
59         if (fix->visual == FB_VISUAL_MONO01 ||
60             fix->visual == FB_VISUAL_MONO10)
61                 depth = 1;
62         else {
63                 if (var->green.length == var->blue.length &&
64                     var->green.length == var->red.length &&
65                     var->green.offset == var->blue.offset &&
66                     var->green.offset == var->red.offset)
67                         depth = var->green.length;
68                 else
69                         depth = var->green.length + var->red.length +
70                                 var->blue.length;
71         }
72
73         return depth;
74 }
75 EXPORT_SYMBOL(fb_get_color_depth);
76
77 /*
78  * Data padding functions.
79  */
80 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
81 {
82         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
83 }
84 EXPORT_SYMBOL(fb_pad_aligned_buffer);
85
86 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
87                                 u32 shift_high, u32 shift_low, u32 mod)
88 {
89         u8 mask = (u8) (0xfff << shift_high), tmp;
90         int i, j;
91
92         for (i = height; i--; ) {
93                 for (j = 0; j < idx; j++) {
94                         tmp = dst[j];
95                         tmp &= mask;
96                         tmp |= *src >> shift_low;
97                         dst[j] = tmp;
98                         tmp = *src << shift_high;
99                         dst[j+1] = tmp;
100                         src++;
101                 }
102                 tmp = dst[idx];
103                 tmp &= mask;
104                 tmp |= *src >> shift_low;
105                 dst[idx] = tmp;
106                 if (shift_high < mod) {
107                         tmp = *src << shift_high;
108                         dst[idx+1] = tmp;
109                 }
110                 src++;
111                 dst += d_pitch;
112         }
113 }
114 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
115
116 /*
117  * we need to lock this section since fb_cursor
118  * may use fb_imageblit()
119  */
120 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
121 {
122         u32 align = buf->buf_align - 1, offset;
123         char *addr = buf->addr;
124
125         /* If IO mapped, we need to sync before access, no sharing of
126          * the pixmap is done
127          */
128         if (buf->flags & FB_PIXMAP_IO) {
129                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
130                         info->fbops->fb_sync(info);
131                 return addr;
132         }
133
134         /* See if we fit in the remaining pixmap space */
135         offset = buf->offset + align;
136         offset &= ~align;
137         if (offset + size > buf->size) {
138                 /* We do not fit. In order to be able to re-use the buffer,
139                  * we must ensure no asynchronous DMA'ing or whatever operation
140                  * is in progress, we sync for that.
141                  */
142                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
143                         info->fbops->fb_sync(info);
144                 offset = 0;
145         }
146         buf->offset = offset + size;
147         addr += offset;
148
149         return addr;
150 }
151
152 #ifdef CONFIG_LOGO
153
154 static inline unsigned safe_shift(unsigned d, int n)
155 {
156         return n < 0 ? d >> -n : d << n;
157 }
158
159 static void fb_set_logocmap(struct fb_info *info,
160                                    const struct linux_logo *logo)
161 {
162         struct fb_cmap palette_cmap;
163         u16 palette_green[16];
164         u16 palette_blue[16];
165         u16 palette_red[16];
166         int i, j, n;
167         const unsigned char *clut = logo->clut;
168
169         palette_cmap.start = 0;
170         palette_cmap.len = 16;
171         palette_cmap.red = palette_red;
172         palette_cmap.green = palette_green;
173         palette_cmap.blue = palette_blue;
174         palette_cmap.transp = NULL;
175
176         for (i = 0; i < logo->clutsize; i += n) {
177                 n = logo->clutsize - i;
178                 /* palette_cmap provides space for only 16 colors at once */
179                 if (n > 16)
180                         n = 16;
181                 palette_cmap.start = 32 + i;
182                 palette_cmap.len = n;
183                 for (j = 0; j < n; ++j) {
184                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
185                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
186                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
187                         clut += 3;
188                 }
189                 fb_set_cmap(&palette_cmap, info);
190         }
191 }
192
193 static void  fb_set_logo_truepalette(struct fb_info *info,
194                                             const struct linux_logo *logo,
195                                             u32 *palette)
196 {
197         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
198         unsigned char redmask, greenmask, bluemask;
199         int redshift, greenshift, blueshift;
200         int i;
201         const unsigned char *clut = logo->clut;
202
203         /*
204          * We have to create a temporary palette since console palette is only
205          * 16 colors long.
206          */
207         /* Bug: Doesn't obey msb_right ... (who needs that?) */
208         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
209         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
210         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
211         redshift   = info->var.red.offset   - (8 - info->var.red.length);
212         greenshift = info->var.green.offset - (8 - info->var.green.length);
213         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
214
215         for ( i = 0; i < logo->clutsize; i++) {
216                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
217                                  safe_shift((clut[1] & greenmask), greenshift) |
218                                  safe_shift((clut[2] & bluemask), blueshift));
219                 clut += 3;
220         }
221 }
222
223 static void fb_set_logo_directpalette(struct fb_info *info,
224                                              const struct linux_logo *logo,
225                                              u32 *palette)
226 {
227         int redshift, greenshift, blueshift;
228         int i;
229
230         redshift = info->var.red.offset;
231         greenshift = info->var.green.offset;
232         blueshift = info->var.blue.offset;
233
234         for (i = 32; i < logo->clutsize; i++)
235                 palette[i] = i << redshift | i << greenshift | i << blueshift;
236 }
237
238 static void fb_set_logo(struct fb_info *info,
239                                const struct linux_logo *logo, u8 *dst,
240                                int depth)
241 {
242         int i, j, k;
243         const u8 *src = logo->data;
244         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
245         u8 fg = 1, d;
246
247         switch (fb_get_color_depth(&info->var, &info->fix)) {
248         case 1:
249                 fg = 1;
250                 break;
251         case 2:
252                 fg = 3;
253                 break;
254         default:
255                 fg = 7;
256                 break;
257         }
258
259         if (info->fix.visual == FB_VISUAL_MONO01 ||
260             info->fix.visual == FB_VISUAL_MONO10)
261                 fg = ~((u8) (0xfff << info->var.green.length));
262
263         switch (depth) {
264         case 4:
265                 for (i = 0; i < logo->height; i++)
266                         for (j = 0; j < logo->width; src++) {
267                                 *dst++ = *src >> 4;
268                                 j++;
269                                 if (j < logo->width) {
270                                         *dst++ = *src & 0x0f;
271                                         j++;
272                                 }
273                         }
274                 break;
275         case 1:
276                 for (i = 0; i < logo->height; i++) {
277                         for (j = 0; j < logo->width; src++) {
278                                 d = *src ^ xor;
279                                 for (k = 7; k >= 0; k--) {
280                                         *dst++ = ((d >> k) & 1) ? fg : 0;
281                                         j++;
282                                 }
283                         }
284                 }
285                 break;
286         }
287 }
288
289 /*
290  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
291  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
292  * the visual format and color depth of the framebuffer, the DAC, the
293  * pseudo_palette, and the logo data will be adjusted accordingly.
294  *
295  * Case 1 - linux_logo_clut224:
296  * Color exceeds the number of console colors (16), thus we set the hardware DAC
297  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
298  *
299  * For visuals that require color info from the pseudo_palette, we also construct
300  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
301  * will be set.
302  *
303  * Case 2 - linux_logo_vga16:
304  * The number of colors just matches the console colors, thus there is no need
305  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
306  * each byte contains color information for two pixels (upper and lower nibble).
307  * To be consistent with fb_imageblit() usage, we therefore separate the two
308  * nibbles into separate bytes. The "depth" flag will be set to 4.
309  *
310  * Case 3 - linux_logo_mono:
311  * This is similar with Case 2.  Each byte contains information for 8 pixels.
312  * We isolate each bit and expand each into a byte. The "depth" flag will
313  * be set to 1.
314  */
315 static struct logo_data {
316         int depth;
317         int needs_directpalette;
318         int needs_truepalette;
319         int needs_cmapreset;
320         const struct linux_logo *logo;
321 } fb_logo __read_mostly;
322
323 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
324 {
325         u32 size = width * height, i;
326
327         out += size - 1;
328
329         for (i = size; i--; )
330                 *out-- = *in++;
331 }
332
333 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
334 {
335         int i, j, h = height - 1;
336
337         for (i = 0; i < height; i++)
338                 for (j = 0; j < width; j++)
339                                 out[height * j + h - i] = *in++;
340 }
341
342 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
343 {
344         int i, j, w = width - 1;
345
346         for (i = 0; i < height; i++)
347                 for (j = 0; j < width; j++)
348                         out[height * (w - j) + i] = *in++;
349 }
350
351 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
352                            struct fb_image *image, int rotate)
353 {
354         u32 tmp;
355
356         if (rotate == FB_ROTATE_UD) {
357                 fb_rotate_logo_ud(image->data, dst, image->width,
358                                   image->height);
359                 image->dx = info->var.xres - image->width - image->dx;
360                 image->dy = info->var.yres - image->height - image->dy;
361         } else if (rotate == FB_ROTATE_CW) {
362                 fb_rotate_logo_cw(image->data, dst, image->width,
363                                   image->height);
364                 tmp = image->width;
365                 image->width = image->height;
366                 image->height = tmp;
367                 tmp = image->dy;
368                 image->dy = image->dx;
369                 image->dx = info->var.xres - image->width - tmp;
370         } else if (rotate == FB_ROTATE_CCW) {
371                 fb_rotate_logo_ccw(image->data, dst, image->width,
372                                    image->height);
373                 tmp = image->width;
374                 image->width = image->height;
375                 image->height = tmp;
376                 tmp = image->dx;
377                 image->dx = image->dy;
378                 image->dy = info->var.yres - image->height - tmp;
379         }
380
381         image->data = dst;
382 }
383
384 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
385                             int rotate, unsigned int num)
386 {
387         unsigned int x;
388
389         if (rotate == FB_ROTATE_UR) {
390                 for (x = 0;
391                      x < num && image->dx + image->width <= info->var.xres;
392                      x++) {
393                         info->fbops->fb_imageblit(info, image);
394                         image->dx += image->width + 8;
395                 }
396         } else if (rotate == FB_ROTATE_UD) {
397                 for (x = 0; x < num && image->dx >= 0; x++) {
398                         info->fbops->fb_imageblit(info, image);
399                         image->dx -= image->width + 8;
400                 }
401         } else if (rotate == FB_ROTATE_CW) {
402                 for (x = 0;
403                      x < num && image->dy + image->height <= info->var.yres;
404                      x++) {
405                         info->fbops->fb_imageblit(info, image);
406                         image->dy += image->height + 8;
407                 }
408         } else if (rotate == FB_ROTATE_CCW) {
409                 for (x = 0; x < num && image->dy >= 0; x++) {
410                         info->fbops->fb_imageblit(info, image);
411                         image->dy -= image->height + 8;
412                 }
413         }
414 }
415
416 static int fb_show_logo_line(struct fb_info *info, int rotate,
417                              const struct linux_logo *logo, int y,
418                              unsigned int n)
419 {
420         u32 *palette = NULL, *saved_pseudo_palette = NULL;
421         unsigned char *logo_new = NULL, *logo_rotate = NULL;
422         struct fb_image image;
423
424         /* Return if the frame buffer is not mapped or suspended */
425         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
426             info->flags & FBINFO_MODULE)
427                 return 0;
428
429         image.depth = 8;
430         image.data = logo->data;
431
432         if (fb_logo.needs_cmapreset)
433                 fb_set_logocmap(info, logo);
434
435         if (fb_logo.needs_truepalette ||
436             fb_logo.needs_directpalette) {
437                 palette = kmalloc(256 * 4, GFP_KERNEL);
438                 if (palette == NULL)
439                         return 0;
440
441                 if (fb_logo.needs_truepalette)
442                         fb_set_logo_truepalette(info, logo, palette);
443                 else
444                         fb_set_logo_directpalette(info, logo, palette);
445
446                 saved_pseudo_palette = info->pseudo_palette;
447                 info->pseudo_palette = palette;
448         }
449
450         if (fb_logo.depth <= 4) {
451                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
452                 if (logo_new == NULL) {
453                         kfree(palette);
454                         if (saved_pseudo_palette)
455                                 info->pseudo_palette = saved_pseudo_palette;
456                         return 0;
457                 }
458                 image.data = logo_new;
459                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
460         }
461
462         image.dx = 0;
463         image.dy = y;
464         image.width = logo->width;
465         image.height = logo->height;
466
467         if (rotate) {
468                 logo_rotate = kmalloc(logo->width *
469                                       logo->height, GFP_KERNEL);
470                 if (logo_rotate)
471                         fb_rotate_logo(info, logo_rotate, &image, rotate);
472         }
473
474         fb_do_show_logo(info, &image, rotate, n);
475
476         kfree(palette);
477         if (saved_pseudo_palette != NULL)
478                 info->pseudo_palette = saved_pseudo_palette;
479         kfree(logo_new);
480         kfree(logo_rotate);
481         return logo->height;
482 }
483
484
485 #ifdef CONFIG_FB_LOGO_EXTRA
486
487 #define FB_LOGO_EX_NUM_MAX 10
488 static struct logo_data_extra {
489         const struct linux_logo *logo;
490         unsigned int n;
491 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
492 static unsigned int fb_logo_ex_num;
493
494 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
495 {
496         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
497                 return;
498
499         fb_logo_ex[fb_logo_ex_num].logo = logo;
500         fb_logo_ex[fb_logo_ex_num].n = n;
501         fb_logo_ex_num++;
502 }
503
504 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
505                                   unsigned int yres)
506 {
507         unsigned int i;
508
509         /* FIXME: logo_ex supports only truecolor fb. */
510         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
511                 fb_logo_ex_num = 0;
512
513         for (i = 0; i < fb_logo_ex_num; i++) {
514                 height += fb_logo_ex[i].logo->height;
515                 if (height > yres) {
516                         height -= fb_logo_ex[i].logo->height;
517                         fb_logo_ex_num = i;
518                         break;
519                 }
520         }
521         return height;
522 }
523
524 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
525 {
526         unsigned int i;
527
528         for (i = 0; i < fb_logo_ex_num; i++)
529                 y += fb_show_logo_line(info, rotate,
530                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
531
532         return y;
533 }
534
535 #else /* !CONFIG_FB_LOGO_EXTRA */
536
537 static inline int fb_prepare_extra_logos(struct fb_info *info,
538                                          unsigned int height,
539                                          unsigned int yres)
540 {
541         return height;
542 }
543
544 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
545 {
546         return y;
547 }
548
549 #endif /* CONFIG_FB_LOGO_EXTRA */
550
551
552 int fb_prepare_logo(struct fb_info *info, int rotate)
553 {
554         int depth = fb_get_color_depth(&info->var, &info->fix);
555         unsigned int yres;
556
557         memset(&fb_logo, 0, sizeof(struct logo_data));
558
559         if (info->flags & FBINFO_MISC_TILEBLITTING ||
560             info->flags & FBINFO_MODULE)
561                 return 0;
562
563         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
564                 depth = info->var.blue.length;
565                 if (info->var.red.length < depth)
566                         depth = info->var.red.length;
567                 if (info->var.green.length < depth)
568                         depth = info->var.green.length;
569         }
570
571         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
572                 /* assume console colormap */
573                 depth = 4;
574         }
575
576         /* Return if no suitable logo was found */
577         fb_logo.logo = fb_find_logo(depth);
578
579         if (!fb_logo.logo) {
580                 return 0;
581         }
582
583         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
584                 yres = info->var.yres;
585         else
586                 yres = info->var.xres;
587
588         if (fb_logo.logo->height > yres) {
589                 fb_logo.logo = NULL;
590                 return 0;
591         }
592
593         /* What depth we asked for might be different from what we get */
594         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
595                 fb_logo.depth = 8;
596         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
597                 fb_logo.depth = 4;
598         else
599                 fb_logo.depth = 1;
600
601
602         if (fb_logo.depth > 4 && depth > 4) {
603                 switch (info->fix.visual) {
604                 case FB_VISUAL_TRUECOLOR:
605                         fb_logo.needs_truepalette = 1;
606                         break;
607                 case FB_VISUAL_DIRECTCOLOR:
608                         fb_logo.needs_directpalette = 1;
609                         fb_logo.needs_cmapreset = 1;
610                         break;
611                 case FB_VISUAL_PSEUDOCOLOR:
612                         fb_logo.needs_cmapreset = 1;
613                         break;
614                 }
615         }
616
617         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
618 }
619
620 int fb_show_logo(struct fb_info *info, int rotate)
621 {
622         int y;
623
624         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
625                               num_online_cpus());
626         y = fb_show_extra_logos(info, y, rotate);
627
628         return y;
629 }
630 #else
631 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
632 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
633 #endif /* CONFIG_LOGO */
634
635 static int fbmem_read_proc(char *buf, char **start, off_t offset,
636                            int len, int *eof, void *private)
637 {
638         struct fb_info **fi;
639         int clen;
640
641         clen = 0;
642         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
643              fi++)
644                 if (*fi)
645                         clen += sprintf(buf + clen, "%d %s\n",
646                                         (*fi)->node,
647                                         (*fi)->fix.id);
648         *start = buf + offset;
649         if (clen > offset)
650                 clen -= offset;
651         else
652                 clen = 0;
653         return clen < len ? clen : len;
654 }
655
656 static ssize_t
657 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
658 {
659         unsigned long p = *ppos;
660         struct inode *inode = file->f_path.dentry->d_inode;
661         int fbidx = iminor(inode);
662         struct fb_info *info = registered_fb[fbidx];
663         u32 *buffer, *dst;
664         u32 __iomem *src;
665         int c, i, cnt = 0, err = 0;
666         unsigned long total_size;
667
668         if (!info || ! info->screen_base)
669                 return -ENODEV;
670
671         if (info->state != FBINFO_STATE_RUNNING)
672                 return -EPERM;
673
674         if (info->fbops->fb_read)
675                 return info->fbops->fb_read(info, buf, count, ppos);
676         
677         total_size = info->screen_size;
678
679         if (total_size == 0)
680                 total_size = info->fix.smem_len;
681
682         if (p >= total_size)
683                 return 0;
684
685         if (count >= total_size)
686                 count = total_size;
687
688         if (count + p > total_size)
689                 count = total_size - p;
690
691         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
692                          GFP_KERNEL);
693         if (!buffer)
694                 return -ENOMEM;
695
696         src = (u32 __iomem *) (info->screen_base + p);
697
698         if (info->fbops->fb_sync)
699                 info->fbops->fb_sync(info);
700
701         while (count) {
702                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
703                 dst = buffer;
704                 for (i = c >> 2; i--; )
705                         *dst++ = fb_readl(src++);
706                 if (c & 3) {
707                         u8 *dst8 = (u8 *) dst;
708                         u8 __iomem *src8 = (u8 __iomem *) src;
709
710                         for (i = c & 3; i--;)
711                                 *dst8++ = fb_readb(src8++);
712
713                         src = (u32 __iomem *) src8;
714                 }
715
716                 if (copy_to_user(buf, buffer, c)) {
717                         err = -EFAULT;
718                         break;
719                 }
720                 *ppos += c;
721                 buf += c;
722                 cnt += c;
723                 count -= c;
724         }
725
726         kfree(buffer);
727
728         return (err) ? err : cnt;
729 }
730
731 static ssize_t
732 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
733 {
734         unsigned long p = *ppos;
735         struct inode *inode = file->f_path.dentry->d_inode;
736         int fbidx = iminor(inode);
737         struct fb_info *info = registered_fb[fbidx];
738         u32 *buffer, *src;
739         u32 __iomem *dst;
740         int c, i, cnt = 0, err = 0;
741         unsigned long total_size;
742
743         if (!info || !info->screen_base)
744                 return -ENODEV;
745
746         if (info->state != FBINFO_STATE_RUNNING)
747                 return -EPERM;
748
749         if (info->fbops->fb_write)
750                 return info->fbops->fb_write(info, buf, count, ppos);
751         
752         total_size = info->screen_size;
753
754         if (total_size == 0)
755                 total_size = info->fix.smem_len;
756
757         if (p > total_size)
758                 return -EFBIG;
759
760         if (count > total_size) {
761                 err = -EFBIG;
762                 count = total_size;
763         }
764
765         if (count + p > total_size) {
766                 if (!err)
767                         err = -ENOSPC;
768
769                 count = total_size - p;
770         }
771
772         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
773                          GFP_KERNEL);
774         if (!buffer)
775                 return -ENOMEM;
776
777         dst = (u32 __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                 src = buffer;
785
786                 if (copy_from_user(src, buf, c)) {
787                         err = -EFAULT;
788                         break;
789                 }
790
791                 for (i = c >> 2; i--; )
792                         fb_writel(*src++, dst++);
793
794                 if (c & 3) {
795                         u8 *src8 = (u8 *) src;
796                         u8 __iomem *dst8 = (u8 __iomem *) dst;
797
798                         for (i = c & 3; i--; )
799                                 fb_writeb(*src8++, dst8++);
800
801                         dst = (u32 __iomem *) dst8;
802                 }
803
804                 *ppos += c;
805                 buf += c;
806                 cnt += c;
807                 count -= c;
808         }
809
810         kfree(buffer);
811
812         return (cnt) ? cnt : err;
813 }
814
815 #ifdef CONFIG_KMOD
816 static void try_to_load(int fb)
817 {
818         request_module("fb%d", fb);
819 }
820 #endif /* CONFIG_KMOD */
821
822 int
823 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
824 {
825         struct fb_fix_screeninfo *fix = &info->fix;
826         int xoffset = var->xoffset;
827         int yoffset = var->yoffset;
828         int err = 0, yres = info->var.yres;
829
830         if (var->yoffset > 0) {
831                 if (var->vmode & FB_VMODE_YWRAP) {
832                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
833                                 err = -EINVAL;
834                         else
835                                 yres = 0;
836                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
837                         err = -EINVAL;
838         }
839
840         if (var->xoffset > 0 && (!fix->xpanstep ||
841                                  (var->xoffset % fix->xpanstep)))
842                 err = -EINVAL;
843
844         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
845             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
846             var->xoffset + info->var.xres > info->var.xres_virtual)
847                 return -EINVAL;
848
849         if ((err = info->fbops->fb_pan_display(var, info)))
850                 return err;
851         info->var.xoffset = var->xoffset;
852         info->var.yoffset = var->yoffset;
853         if (var->vmode & FB_VMODE_YWRAP)
854                 info->var.vmode |= FB_VMODE_YWRAP;
855         else
856                 info->var.vmode &= ~FB_VMODE_YWRAP;
857         return 0;
858 }
859
860 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
861                          u32 activate)
862 {
863         struct fb_event event;
864         struct fb_blit_caps caps, fbcaps;
865         int err = 0;
866
867         memset(&caps, 0, sizeof(caps));
868         memset(&fbcaps, 0, sizeof(fbcaps));
869         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
870         event.info = info;
871         event.data = &caps;
872         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
873         info->fbops->fb_get_caps(info, &fbcaps, var);
874
875         if (((fbcaps.x ^ caps.x) & caps.x) ||
876             ((fbcaps.y ^ caps.y) & caps.y) ||
877             (fbcaps.len < caps.len))
878                 err = -EINVAL;
879
880         return err;
881 }
882
883 int
884 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
885 {
886         int flags = info->flags;
887         int ret = 0;
888
889         if (var->activate & FB_ACTIVATE_INV_MODE) {
890                 struct fb_videomode mode1, mode2;
891
892                 fb_var_to_videomode(&mode1, var);
893                 fb_var_to_videomode(&mode2, &info->var);
894                 /* make sure we don't delete the videomode of current var */
895                 ret = fb_mode_is_equal(&mode1, &mode2);
896
897                 if (!ret) {
898                     struct fb_event event;
899
900                     event.info = info;
901                     event.data = &mode1;
902                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
903                 }
904
905                 if (!ret)
906                     fb_delete_videomode(&mode1, &info->modelist);
907
908
909                 ret = (ret) ? -EINVAL : 0;
910                 goto done;
911         }
912
913         if ((var->activate & FB_ACTIVATE_FORCE) ||
914             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
915                 u32 activate = var->activate;
916
917                 if (!info->fbops->fb_check_var) {
918                         *var = info->var;
919                         goto done;
920                 }
921
922                 ret = info->fbops->fb_check_var(var, info);
923
924                 if (ret)
925                         goto done;
926
927                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
928                         struct fb_videomode mode;
929
930                         if (info->fbops->fb_get_caps) {
931                                 ret = fb_check_caps(info, var, activate);
932
933                                 if (ret)
934                                         goto done;
935                         }
936
937                         info->var = *var;
938
939                         if (info->fbops->fb_set_par)
940                                 info->fbops->fb_set_par(info);
941
942                         fb_pan_display(info, &info->var);
943                         fb_set_cmap(&info->cmap, info);
944                         fb_var_to_videomode(&mode, &info->var);
945
946                         if (info->modelist.prev && info->modelist.next &&
947                             !list_empty(&info->modelist))
948                                 ret = fb_add_videomode(&mode, &info->modelist);
949
950                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
951                                 struct fb_event event;
952                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
953                                         FB_EVENT_MODE_CHANGE_ALL :
954                                         FB_EVENT_MODE_CHANGE;
955
956                                 info->flags &= ~FBINFO_MISC_USEREVENT;
957                                 event.info = info;
958                                 fb_notifier_call_chain(evnt, &event);
959                         }
960                 }
961         }
962
963  done:
964         return ret;
965 }
966
967 int
968 fb_blank(struct fb_info *info, int blank)
969 {       
970         int ret = -EINVAL;
971
972         if (blank > FB_BLANK_POWERDOWN)
973                 blank = FB_BLANK_POWERDOWN;
974
975         if (info->fbops->fb_blank)
976                 ret = info->fbops->fb_blank(blank, info);
977
978         if (!ret) {
979                 struct fb_event event;
980
981                 event.info = info;
982                 event.data = &blank;
983                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
984         }
985
986         return ret;
987 }
988
989 static int 
990 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
991          unsigned long arg)
992 {
993         int fbidx = iminor(inode);
994         struct fb_info *info = registered_fb[fbidx];
995         struct fb_ops *fb = info->fbops;
996         struct fb_var_screeninfo var;
997         struct fb_fix_screeninfo fix;
998         struct fb_con2fbmap con2fb;
999         struct fb_cmap_user cmap;
1000         struct fb_event event;
1001         void __user *argp = (void __user *)arg;
1002         int i;
1003         
1004         if (!fb)
1005                 return -ENODEV;
1006         switch (cmd) {
1007         case FBIOGET_VSCREENINFO:
1008                 return copy_to_user(argp, &info->var,
1009                                     sizeof(var)) ? -EFAULT : 0;
1010         case FBIOPUT_VSCREENINFO:
1011                 if (copy_from_user(&var, argp, sizeof(var)))
1012                         return -EFAULT;
1013                 acquire_console_sem();
1014                 info->flags |= FBINFO_MISC_USEREVENT;
1015                 i = fb_set_var(info, &var);
1016                 info->flags &= ~FBINFO_MISC_USEREVENT;
1017                 release_console_sem();
1018                 if (i) return i;
1019                 if (copy_to_user(argp, &var, sizeof(var)))
1020                         return -EFAULT;
1021                 return 0;
1022         case FBIOGET_FSCREENINFO:
1023                 return copy_to_user(argp, &info->fix,
1024                                     sizeof(fix)) ? -EFAULT : 0;
1025         case FBIOPUTCMAP:
1026                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1027                         return -EFAULT;
1028                 return (fb_set_user_cmap(&cmap, info));
1029         case FBIOGETCMAP:
1030                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1031                         return -EFAULT;
1032                 return fb_cmap_to_user(&info->cmap, &cmap);
1033         case FBIOPAN_DISPLAY:
1034                 if (copy_from_user(&var, argp, sizeof(var)))
1035                         return -EFAULT;
1036                 acquire_console_sem();
1037                 i = fb_pan_display(info, &var);
1038                 release_console_sem();
1039                 if (i)
1040                         return i;
1041                 if (copy_to_user(argp, &var, sizeof(var)))
1042                         return -EFAULT;
1043                 return 0;
1044         case FBIO_CURSOR:
1045                 return -EINVAL;
1046         case FBIOGET_CON2FBMAP:
1047                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1048                         return -EFAULT;
1049                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1050                     return -EINVAL;
1051                 con2fb.framebuffer = -1;
1052                 event.info = info;
1053                 event.data = &con2fb;
1054                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1055                 return copy_to_user(argp, &con2fb,
1056                                     sizeof(con2fb)) ? -EFAULT : 0;
1057         case FBIOPUT_CON2FBMAP:
1058                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1059                         return - EFAULT;
1060                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
1061                     return -EINVAL;
1062                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1063                     return -EINVAL;
1064 #ifdef CONFIG_KMOD
1065                 if (!registered_fb[con2fb.framebuffer])
1066                     try_to_load(con2fb.framebuffer);
1067 #endif /* CONFIG_KMOD */
1068                 if (!registered_fb[con2fb.framebuffer])
1069                     return -EINVAL;
1070                 event.info = info;
1071                 event.data = &con2fb;
1072                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1073                                               &event);
1074         case FBIOBLANK:
1075                 acquire_console_sem();
1076                 info->flags |= FBINFO_MISC_USEREVENT;
1077                 i = fb_blank(info, arg);
1078                 info->flags &= ~FBINFO_MISC_USEREVENT;
1079                 release_console_sem();
1080                 return i;
1081         default:
1082                 if (fb->fb_ioctl == NULL)
1083                         return -EINVAL;
1084                 return fb->fb_ioctl(info, cmd, arg);
1085         }
1086 }
1087
1088 #ifdef CONFIG_COMPAT
1089 struct fb_fix_screeninfo32 {
1090         char                    id[16];
1091         compat_caddr_t          smem_start;
1092         u32                     smem_len;
1093         u32                     type;
1094         u32                     type_aux;
1095         u32                     visual;
1096         u16                     xpanstep;
1097         u16                     ypanstep;
1098         u16                     ywrapstep;
1099         u32                     line_length;
1100         compat_caddr_t          mmio_start;
1101         u32                     mmio_len;
1102         u32                     accel;
1103         u16                     reserved[3];
1104 };
1105
1106 struct fb_cmap32 {
1107         u32                     start;
1108         u32                     len;
1109         compat_caddr_t  red;
1110         compat_caddr_t  green;
1111         compat_caddr_t  blue;
1112         compat_caddr_t  transp;
1113 };
1114
1115 static int fb_getput_cmap(struct inode *inode, struct file *file,
1116                         unsigned int cmd, unsigned long arg)
1117 {
1118         struct fb_cmap_user __user *cmap;
1119         struct fb_cmap32 __user *cmap32;
1120         __u32 data;
1121         int err;
1122
1123         cmap = compat_alloc_user_space(sizeof(*cmap));
1124         cmap32 = compat_ptr(arg);
1125
1126         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1127                 return -EFAULT;
1128
1129         if (get_user(data, &cmap32->red) ||
1130             put_user(compat_ptr(data), &cmap->red) ||
1131             get_user(data, &cmap32->green) ||
1132             put_user(compat_ptr(data), &cmap->green) ||
1133             get_user(data, &cmap32->blue) ||
1134             put_user(compat_ptr(data), &cmap->blue) ||
1135             get_user(data, &cmap32->transp) ||
1136             put_user(compat_ptr(data), &cmap->transp))
1137                 return -EFAULT;
1138
1139         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1140
1141         if (!err) {
1142                 if (copy_in_user(&cmap32->start,
1143                                  &cmap->start,
1144                                  2 * sizeof(__u32)))
1145                         err = -EFAULT;
1146         }
1147         return err;
1148 }
1149
1150 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1151                                   struct fb_fix_screeninfo32 __user *fix32)
1152 {
1153         __u32 data;
1154         int err;
1155
1156         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1157
1158         data = (__u32) (unsigned long) fix->smem_start;
1159         err |= put_user(data, &fix32->smem_start);
1160
1161         err |= put_user(fix->smem_len, &fix32->smem_len);
1162         err |= put_user(fix->type, &fix32->type);
1163         err |= put_user(fix->type_aux, &fix32->type_aux);
1164         err |= put_user(fix->visual, &fix32->visual);
1165         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1166         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1167         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1168         err |= put_user(fix->line_length, &fix32->line_length);
1169
1170         data = (__u32) (unsigned long) fix->mmio_start;
1171         err |= put_user(data, &fix32->mmio_start);
1172
1173         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1174         err |= put_user(fix->accel, &fix32->accel);
1175         err |= copy_to_user(fix32->reserved, fix->reserved,
1176                             sizeof(fix->reserved));
1177
1178         return err;
1179 }
1180
1181 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1182                                 unsigned int cmd, unsigned long arg)
1183 {
1184         mm_segment_t old_fs;
1185         struct fb_fix_screeninfo fix;
1186         struct fb_fix_screeninfo32 __user *fix32;
1187         int err;
1188
1189         fix32 = compat_ptr(arg);
1190
1191         old_fs = get_fs();
1192         set_fs(KERNEL_DS);
1193         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1194         set_fs(old_fs);
1195
1196         if (!err)
1197                 err = do_fscreeninfo_to_user(&fix, fix32);
1198
1199         return err;
1200 }
1201
1202 static long
1203 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1204 {
1205         struct inode *inode = file->f_path.dentry->d_inode;
1206         int fbidx = iminor(inode);
1207         struct fb_info *info = registered_fb[fbidx];
1208         struct fb_ops *fb = info->fbops;
1209         long ret = -ENOIOCTLCMD;
1210
1211         lock_kernel();
1212         switch(cmd) {
1213         case FBIOGET_VSCREENINFO:
1214         case FBIOPUT_VSCREENINFO:
1215         case FBIOPAN_DISPLAY:
1216         case FBIOGET_CON2FBMAP:
1217         case FBIOPUT_CON2FBMAP:
1218                 arg = (unsigned long) compat_ptr(arg);
1219         case FBIOBLANK:
1220                 ret = fb_ioctl(inode, file, cmd, arg);
1221                 break;
1222
1223         case FBIOGET_FSCREENINFO:
1224                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1225                 break;
1226
1227         case FBIOGETCMAP:
1228         case FBIOPUTCMAP:
1229                 ret = fb_getput_cmap(inode, file, cmd, arg);
1230                 break;
1231
1232         default:
1233                 if (fb->fb_compat_ioctl)
1234                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1235                 break;
1236         }
1237         unlock_kernel();
1238         return ret;
1239 }
1240 #endif
1241
1242 static int
1243 fb_mmap(struct file *file, struct vm_area_struct * vma)
1244 {
1245         int fbidx = iminor(file->f_path.dentry->d_inode);
1246         struct fb_info *info = registered_fb[fbidx];
1247         struct fb_ops *fb = info->fbops;
1248         unsigned long off;
1249         unsigned long start;
1250         u32 len;
1251
1252         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1253                 return -EINVAL;
1254         off = vma->vm_pgoff << PAGE_SHIFT;
1255         if (!fb)
1256                 return -ENODEV;
1257         if (fb->fb_mmap) {
1258                 int res;
1259                 lock_kernel();
1260                 res = fb->fb_mmap(info, vma);
1261                 unlock_kernel();
1262                 return res;
1263         }
1264
1265         lock_kernel();
1266
1267         /* frame buffer memory */
1268         start = info->fix.smem_start;
1269         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1270         if (off >= len) {
1271                 /* memory mapped io */
1272                 off -= len;
1273                 if (info->var.accel_flags) {
1274                         unlock_kernel();
1275                         return -EINVAL;
1276                 }
1277                 start = info->fix.mmio_start;
1278                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1279         }
1280         unlock_kernel();
1281         start &= PAGE_MASK;
1282         if ((vma->vm_end - vma->vm_start + off) > len)
1283                 return -EINVAL;
1284         off += start;
1285         vma->vm_pgoff = off >> PAGE_SHIFT;
1286         /* This is an IO map - tell maydump to skip this VMA */
1287         vma->vm_flags |= VM_IO | VM_RESERVED;
1288         fb_pgprotect(file, vma, off);
1289         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1290                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1291                 return -EAGAIN;
1292         return 0;
1293 }
1294
1295 static int
1296 fb_open(struct inode *inode, struct file *file)
1297 {
1298         int fbidx = iminor(inode);
1299         struct fb_info *info;
1300         int res = 0;
1301
1302         if (fbidx >= FB_MAX)
1303                 return -ENODEV;
1304 #ifdef CONFIG_KMOD
1305         if (!(info = registered_fb[fbidx]))
1306                 try_to_load(fbidx);
1307 #endif /* CONFIG_KMOD */
1308         if (!(info = registered_fb[fbidx]))
1309                 return -ENODEV;
1310         if (!try_module_get(info->fbops->owner))
1311                 return -ENODEV;
1312         file->private_data = info;
1313         if (info->fbops->fb_open) {
1314                 res = info->fbops->fb_open(info,1);
1315                 if (res)
1316                         module_put(info->fbops->owner);
1317         }
1318         return res;
1319 }
1320
1321 static int 
1322 fb_release(struct inode *inode, struct file *file)
1323 {
1324         struct fb_info * const info = file->private_data;
1325
1326         lock_kernel();
1327         if (info->fbops->fb_release)
1328                 info->fbops->fb_release(info,1);
1329         module_put(info->fbops->owner);
1330         unlock_kernel();
1331         return 0;
1332 }
1333
1334 static const struct file_operations fb_fops = {
1335         .owner =        THIS_MODULE,
1336         .read =         fb_read,
1337         .write =        fb_write,
1338         .ioctl =        fb_ioctl,
1339 #ifdef CONFIG_COMPAT
1340         .compat_ioctl = fb_compat_ioctl,
1341 #endif
1342         .mmap =         fb_mmap,
1343         .open =         fb_open,
1344         .release =      fb_release,
1345 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1346         .get_unmapped_area = get_fb_unmapped_area,
1347 #endif
1348 #ifdef CONFIG_FB_DEFERRED_IO
1349         .fsync =        fb_deferred_io_fsync,
1350 #endif
1351 };
1352
1353 struct class *fb_class;
1354 EXPORT_SYMBOL(fb_class);
1355 /**
1356  *      register_framebuffer - registers a frame buffer device
1357  *      @fb_info: frame buffer info structure
1358  *
1359  *      Registers a frame buffer device @fb_info.
1360  *
1361  *      Returns negative errno on error, or zero for success.
1362  *
1363  */
1364
1365 int
1366 register_framebuffer(struct fb_info *fb_info)
1367 {
1368         int i;
1369         struct fb_event event;
1370         struct fb_videomode mode;
1371
1372         if (num_registered_fb == FB_MAX)
1373                 return -ENXIO;
1374         num_registered_fb++;
1375         for (i = 0 ; i < FB_MAX; i++)
1376                 if (!registered_fb[i])
1377                         break;
1378         fb_info->node = i;
1379
1380         fb_info->dev = device_create(fb_class, fb_info->device,
1381                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1382         if (IS_ERR(fb_info->dev)) {
1383                 /* Not fatal */
1384                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1385                 fb_info->dev = NULL;
1386         } else
1387                 fb_init_device(fb_info);
1388
1389         if (fb_info->pixmap.addr == NULL) {
1390                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1391                 if (fb_info->pixmap.addr) {
1392                         fb_info->pixmap.size = FBPIXMAPSIZE;
1393                         fb_info->pixmap.buf_align = 1;
1394                         fb_info->pixmap.scan_align = 1;
1395                         fb_info->pixmap.access_align = 32;
1396                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1397                 }
1398         }       
1399         fb_info->pixmap.offset = 0;
1400
1401         if (!fb_info->pixmap.blit_x)
1402                 fb_info->pixmap.blit_x = ~(u32)0;
1403
1404         if (!fb_info->pixmap.blit_y)
1405                 fb_info->pixmap.blit_y = ~(u32)0;
1406
1407         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1408                 INIT_LIST_HEAD(&fb_info->modelist);
1409
1410         fb_var_to_videomode(&mode, &fb_info->var);
1411         fb_add_videomode(&mode, &fb_info->modelist);
1412         registered_fb[i] = fb_info;
1413
1414         event.info = fb_info;
1415         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1416         return 0;
1417 }
1418
1419
1420 /**
1421  *      unregister_framebuffer - releases a frame buffer device
1422  *      @fb_info: frame buffer info structure
1423  *
1424  *      Unregisters a frame buffer device @fb_info.
1425  *
1426  *      Returns negative errno on error, or zero for success.
1427  *
1428  *      This function will also notify the framebuffer console
1429  *      to release the driver.
1430  *
1431  *      This is meant to be called within a driver's module_exit()
1432  *      function. If this is called outside module_exit(), ensure
1433  *      that the driver implements fb_open() and fb_release() to
1434  *      check that no processes are using the device.
1435  */
1436
1437 int
1438 unregister_framebuffer(struct fb_info *fb_info)
1439 {
1440         struct fb_event event;
1441         int i, ret = 0;
1442
1443         i = fb_info->node;
1444         if (!registered_fb[i]) {
1445                 ret = -EINVAL;
1446                 goto done;
1447         }
1448
1449         event.info = fb_info;
1450         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1451
1452         if (ret) {
1453                 ret = -EINVAL;
1454                 goto done;
1455         }
1456
1457         if (fb_info->pixmap.addr &&
1458             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1459                 kfree(fb_info->pixmap.addr);
1460         fb_destroy_modelist(&fb_info->modelist);
1461         registered_fb[i]=NULL;
1462         num_registered_fb--;
1463         fb_cleanup_device(fb_info);
1464         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1465         event.info = fb_info;
1466         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1467 done:
1468         return ret;
1469 }
1470
1471 /**
1472  *      fb_set_suspend - low level driver signals suspend
1473  *      @info: framebuffer affected
1474  *      @state: 0 = resuming, !=0 = suspending
1475  *
1476  *      This is meant to be used by low level drivers to
1477  *      signal suspend/resume to the core & clients.
1478  *      It must be called with the console semaphore held
1479  */
1480 void fb_set_suspend(struct fb_info *info, int state)
1481 {
1482         struct fb_event event;
1483
1484         event.info = info;
1485         if (state) {
1486                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1487                 info->state = FBINFO_STATE_SUSPENDED;
1488         } else {
1489                 info->state = FBINFO_STATE_RUNNING;
1490                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1491         }
1492 }
1493
1494 /**
1495  *      fbmem_init - init frame buffer subsystem
1496  *
1497  *      Initialize the frame buffer subsystem.
1498  *
1499  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1500  *
1501  */
1502
1503 static int __init
1504 fbmem_init(void)
1505 {
1506         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1507
1508         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1509                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1510
1511         fb_class = class_create(THIS_MODULE, "graphics");
1512         if (IS_ERR(fb_class)) {
1513                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1514                 fb_class = NULL;
1515         }
1516         return 0;
1517 }
1518
1519 #ifdef MODULE
1520 module_init(fbmem_init);
1521 static void __exit
1522 fbmem_exit(void)
1523 {
1524         class_destroy(fb_class);
1525         unregister_chrdev(FB_MAJOR, "fb");
1526 }
1527
1528 module_exit(fbmem_exit);
1529 MODULE_LICENSE("GPL");
1530 MODULE_DESCRIPTION("Framebuffer base");
1531 #else
1532 subsys_initcall(fbmem_init);
1533 #endif
1534
1535 int fb_new_modelist(struct fb_info *info)
1536 {
1537         struct fb_event event;
1538         struct fb_var_screeninfo var = info->var;
1539         struct list_head *pos, *n;
1540         struct fb_modelist *modelist;
1541         struct fb_videomode *m, mode;
1542         int err = 1;
1543
1544         list_for_each_safe(pos, n, &info->modelist) {
1545                 modelist = list_entry(pos, struct fb_modelist, list);
1546                 m = &modelist->mode;
1547                 fb_videomode_to_var(&var, m);
1548                 var.activate = FB_ACTIVATE_TEST;
1549                 err = fb_set_var(info, &var);
1550                 fb_var_to_videomode(&mode, &var);
1551                 if (err || !fb_mode_is_equal(m, &mode)) {
1552                         list_del(pos);
1553                         kfree(pos);
1554                 }
1555         }
1556
1557         err = 1;
1558
1559         if (!list_empty(&info->modelist)) {
1560                 event.info = info;
1561                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1562         }
1563
1564         return err;
1565 }
1566
1567 static char *video_options[FB_MAX] __read_mostly;
1568 static int ofonly __read_mostly;
1569
1570 /**
1571  * fb_get_options - get kernel boot parameters
1572  * @name:   framebuffer name as it would appear in
1573  *          the boot parameter line
1574  *          (video=<name>:<options>)
1575  * @option: the option will be stored here
1576  *
1577  * NOTE: Needed to maintain backwards compatibility
1578  */
1579 int fb_get_options(char *name, char **option)
1580 {
1581         char *opt, *options = NULL;
1582         int opt_len, retval = 0;
1583         int name_len = strlen(name), i;
1584
1585         if (name_len && ofonly && strncmp(name, "offb", 4))
1586                 retval = 1;
1587
1588         if (name_len && !retval) {
1589                 for (i = 0; i < FB_MAX; i++) {
1590                         if (video_options[i] == NULL)
1591                                 continue;
1592                         opt_len = strlen(video_options[i]);
1593                         if (!opt_len)
1594                                 continue;
1595                         opt = video_options[i];
1596                         if (!strncmp(name, opt, name_len) &&
1597                             opt[name_len] == ':')
1598                                 options = opt + name_len + 1;
1599                 }
1600         }
1601         if (options && !strncmp(options, "off", 3))
1602                 retval = 1;
1603
1604         if (option)
1605                 *option = options;
1606
1607         return retval;
1608 }
1609
1610 #ifndef MODULE
1611 /**
1612  *      video_setup - process command line options
1613  *      @options: string of options
1614  *
1615  *      Process command line options for frame buffer subsystem.
1616  *
1617  *      NOTE: This function is a __setup and __init function.
1618  *            It only stores the options.  Drivers have to call
1619  *            fb_get_options() as necessary.
1620  *
1621  *      Returns zero.
1622  *
1623  */
1624 static int __init video_setup(char *options)
1625 {
1626         int i, global = 0;
1627
1628         if (!options || !*options)
1629                 global = 1;
1630
1631         if (!global && !strncmp(options, "ofonly", 6)) {
1632                 ofonly = 1;
1633                 global = 1;
1634         }
1635
1636         if (!global && !strstr(options, "fb:")) {
1637                 fb_mode_option = options;
1638                 global = 1;
1639         }
1640
1641         if (!global) {
1642                 for (i = 0; i < FB_MAX; i++) {
1643                         if (video_options[i] == NULL) {
1644                                 video_options[i] = options;
1645                                 break;
1646                         }
1647
1648                 }
1649         }
1650
1651         return 1;
1652 }
1653 __setup("video=", video_setup);
1654 #endif
1655
1656     /*
1657      *  Visible symbols for modules
1658      */
1659
1660 EXPORT_SYMBOL(register_framebuffer);
1661 EXPORT_SYMBOL(unregister_framebuffer);
1662 EXPORT_SYMBOL(num_registered_fb);
1663 EXPORT_SYMBOL(registered_fb);
1664 EXPORT_SYMBOL(fb_show_logo);
1665 EXPORT_SYMBOL(fb_set_var);
1666 EXPORT_SYMBOL(fb_blank);
1667 EXPORT_SYMBOL(fb_pan_display);
1668 EXPORT_SYMBOL(fb_get_buffer_offset);
1669 EXPORT_SYMBOL(fb_set_suspend);
1670 EXPORT_SYMBOL(fb_get_options);
1671
1672 MODULE_LICENSE("GPL");