38c2e2558f5e34ac8285ca91253b204e9ae4cc51
[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/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
37 #if defined(__mc68000__) || defined(CONFIG_APUS)
38 #include <asm/setup.h>
39 #endif
40
41 #include <asm/io.h>
42 #include <asm/uaccess.h>
43 #include <asm/page.h>
44 #include <asm/pgtable.h>
45
46 #include <linux/fb.h>
47
48     /*
49      *  Frame buffer device initialization and setup routines
50      */
51
52 #define FBPIXMAPSIZE    (1024 * 8)
53
54 struct fb_info *registered_fb[FB_MAX] __read_mostly;
55 int num_registered_fb __read_mostly;
56
57 /*
58  * Helpers
59  */
60
61 int fb_get_color_depth(struct fb_var_screeninfo *var,
62                        struct fb_fix_screeninfo *fix)
63 {
64         int depth = 0;
65
66         if (fix->visual == FB_VISUAL_MONO01 ||
67             fix->visual == FB_VISUAL_MONO10)
68                 depth = 1;
69         else {
70                 if (var->green.length == var->blue.length &&
71                     var->green.length == var->red.length &&
72                     var->green.offset == var->blue.offset &&
73                     var->green.offset == var->red.offset)
74                         depth = var->green.length;
75                 else
76                         depth = var->green.length + var->red.length +
77                                 var->blue.length;
78         }
79
80         return depth;
81 }
82 EXPORT_SYMBOL(fb_get_color_depth);
83
84 /*
85  * Data padding functions.
86  */
87 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
88 {
89         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
90 }
91 EXPORT_SYMBOL(fb_pad_aligned_buffer);
92
93 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
94                                 u32 shift_high, u32 shift_low, u32 mod)
95 {
96         u8 mask = (u8) (0xfff << shift_high), tmp;
97         int i, j;
98
99         for (i = height; i--; ) {
100                 for (j = 0; j < idx; j++) {
101                         tmp = dst[j];
102                         tmp &= mask;
103                         tmp |= *src >> shift_low;
104                         dst[j] = tmp;
105                         tmp = *src << shift_high;
106                         dst[j+1] = tmp;
107                         src++;
108                 }
109                 tmp = dst[idx];
110                 tmp &= mask;
111                 tmp |= *src >> shift_low;
112                 dst[idx] = tmp;
113                 if (shift_high < mod) {
114                         tmp = *src << shift_high;
115                         dst[idx+1] = tmp;
116                 }
117                 src++;
118                 dst += d_pitch;
119         }
120 }
121 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
122
123 /*
124  * we need to lock this section since fb_cursor
125  * may use fb_imageblit()
126  */
127 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
128 {
129         u32 align = buf->buf_align - 1, offset;
130         char *addr = buf->addr;
131
132         /* If IO mapped, we need to sync before access, no sharing of
133          * the pixmap is done
134          */
135         if (buf->flags & FB_PIXMAP_IO) {
136                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
137                         info->fbops->fb_sync(info);
138                 return addr;
139         }
140
141         /* See if we fit in the remaining pixmap space */
142         offset = buf->offset + align;
143         offset &= ~align;
144         if (offset + size > buf->size) {
145                 /* We do not fit. In order to be able to re-use the buffer,
146                  * we must ensure no asynchronous DMA'ing or whatever operation
147                  * is in progress, we sync for that.
148                  */
149                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
150                         info->fbops->fb_sync(info);
151                 offset = 0;
152         }
153         buf->offset = offset + size;
154         addr += offset;
155
156         return addr;
157 }
158
159 #ifdef CONFIG_LOGO
160
161 static inline unsigned safe_shift(unsigned d, int n)
162 {
163         return n < 0 ? d >> -n : d << n;
164 }
165
166 static void fb_set_logocmap(struct fb_info *info,
167                                    const struct linux_logo *logo)
168 {
169         struct fb_cmap palette_cmap;
170         u16 palette_green[16];
171         u16 palette_blue[16];
172         u16 palette_red[16];
173         int i, j, n;
174         const unsigned char *clut = logo->clut;
175
176         palette_cmap.start = 0;
177         palette_cmap.len = 16;
178         palette_cmap.red = palette_red;
179         palette_cmap.green = palette_green;
180         palette_cmap.blue = palette_blue;
181         palette_cmap.transp = NULL;
182
183         for (i = 0; i < logo->clutsize; i += n) {
184                 n = logo->clutsize - i;
185                 /* palette_cmap provides space for only 16 colors at once */
186                 if (n > 16)
187                         n = 16;
188                 palette_cmap.start = 32 + i;
189                 palette_cmap.len = n;
190                 for (j = 0; j < n; ++j) {
191                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
192                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
193                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
194                         clut += 3;
195                 }
196                 fb_set_cmap(&palette_cmap, info);
197         }
198 }
199
200 static void  fb_set_logo_truepalette(struct fb_info *info,
201                                             const struct linux_logo *logo,
202                                             u32 *palette)
203 {
204         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
205         unsigned char redmask, greenmask, bluemask;
206         int redshift, greenshift, blueshift;
207         int i;
208         const unsigned char *clut = logo->clut;
209
210         /*
211          * We have to create a temporary palette since console palette is only
212          * 16 colors long.
213          */
214         /* Bug: Doesn't obey msb_right ... (who needs that?) */
215         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
216         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
217         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
218         redshift   = info->var.red.offset   - (8 - info->var.red.length);
219         greenshift = info->var.green.offset - (8 - info->var.green.length);
220         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
221
222         for ( i = 0; i < logo->clutsize; i++) {
223                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
224                                  safe_shift((clut[1] & greenmask), greenshift) |
225                                  safe_shift((clut[2] & bluemask), blueshift));
226                 clut += 3;
227         }
228 }
229
230 static void fb_set_logo_directpalette(struct fb_info *info,
231                                              const struct linux_logo *logo,
232                                              u32 *palette)
233 {
234         int redshift, greenshift, blueshift;
235         int i;
236
237         redshift = info->var.red.offset;
238         greenshift = info->var.green.offset;
239         blueshift = info->var.blue.offset;
240
241         for (i = 32; i < logo->clutsize; i++)
242                 palette[i] = i << redshift | i << greenshift | i << blueshift;
243 }
244
245 static void fb_set_logo(struct fb_info *info,
246                                const struct linux_logo *logo, u8 *dst,
247                                int depth)
248 {
249         int i, j, k;
250         const u8 *src = logo->data;
251         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
252         u8 fg = 1, d;
253
254         if (fb_get_color_depth(&info->var, &info->fix) == 3)
255                 fg = 7;
256
257         if (info->fix.visual == FB_VISUAL_MONO01 ||
258             info->fix.visual == FB_VISUAL_MONO10)
259                 fg = ~((u8) (0xfff << info->var.green.length));
260
261         switch (depth) {
262         case 4:
263                 for (i = 0; i < logo->height; i++)
264                         for (j = 0; j < logo->width; src++) {
265                                 *dst++ = *src >> 4;
266                                 j++;
267                                 if (j < logo->width) {
268                                         *dst++ = *src & 0x0f;
269                                         j++;
270                                 }
271                         }
272                 break;
273         case 1:
274                 for (i = 0; i < logo->height; i++) {
275                         for (j = 0; j < logo->width; src++) {
276                                 d = *src ^ xor;
277                                 for (k = 7; k >= 0; k--) {
278                                         *dst++ = ((d >> k) & 1) ? fg : 0;
279                                         j++;
280                                 }
281                         }
282                 }
283                 break;
284         }
285 }
286
287 /*
288  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
289  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
290  * the visual format and color depth of the framebuffer, the DAC, the
291  * pseudo_palette, and the logo data will be adjusted accordingly.
292  *
293  * Case 1 - linux_logo_clut224:
294  * Color exceeds the number of console colors (16), thus we set the hardware DAC
295  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
296  *
297  * For visuals that require color info from the pseudo_palette, we also construct
298  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
299  * will be set.
300  *
301  * Case 2 - linux_logo_vga16:
302  * The number of colors just matches the console colors, thus there is no need
303  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
304  * each byte contains color information for two pixels (upper and lower nibble).
305  * To be consistent with fb_imageblit() usage, we therefore separate the two
306  * nibbles into separate bytes. The "depth" flag will be set to 4.
307  *
308  * Case 3 - linux_logo_mono:
309  * This is similar with Case 2.  Each byte contains information for 8 pixels.
310  * We isolate each bit and expand each into a byte. The "depth" flag will
311  * be set to 1.
312  */
313 static struct logo_data {
314         int depth;
315         int needs_directpalette;
316         int needs_truepalette;
317         int needs_cmapreset;
318         const struct linux_logo *logo;
319 } fb_logo __read_mostly;
320
321 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
322 {
323         u32 size = width * height, i;
324
325         out += size - 1;
326
327         for (i = size; i--; )
328                 *out-- = *in++;
329 }
330
331 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
332 {
333         int i, j, h = height - 1;
334
335         for (i = 0; i < height; i++)
336                 for (j = 0; j < width; j++)
337                                 out[height * j + h - i] = *in++;
338 }
339
340 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
341 {
342         int i, j, w = width - 1;
343
344         for (i = 0; i < height; i++)
345                 for (j = 0; j < width; j++)
346                         out[height * (w - j) + i] = *in++;
347 }
348
349 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
350                            struct fb_image *image, int rotate)
351 {
352         u32 tmp;
353
354         if (rotate == FB_ROTATE_UD) {
355                 fb_rotate_logo_ud(image->data, dst, image->width,
356                                   image->height);
357                 image->dx = info->var.xres - image->width - image->dx;
358                 image->dy = info->var.yres - image->height - image->dy;
359         } else if (rotate == FB_ROTATE_CW) {
360                 fb_rotate_logo_cw(image->data, dst, image->width,
361                                   image->height);
362                 tmp = image->width;
363                 image->width = image->height;
364                 image->height = tmp;
365                 tmp = image->dy;
366                 image->dy = image->dx;
367                 image->dx = info->var.xres - image->width - tmp;
368         } else if (rotate == FB_ROTATE_CCW) {
369                 fb_rotate_logo_ccw(image->data, dst, image->width,
370                                    image->height);
371                 tmp = image->width;
372                 image->width = image->height;
373                 image->height = tmp;
374                 tmp = image->dx;
375                 image->dx = image->dy;
376                 image->dy = info->var.yres - image->height - tmp;
377         }
378
379         image->data = dst;
380 }
381
382 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
383                             int rotate, unsigned int num)
384 {
385         unsigned int x;
386
387         if (rotate == FB_ROTATE_UR) {
388                 for (x = 0;
389                      x < num && image->dx + image->width <= info->var.xres;
390                      x++) {
391                         info->fbops->fb_imageblit(info, image);
392                         image->dx += image->width + 8;
393                 }
394         } else if (rotate == FB_ROTATE_UD) {
395                 for (x = 0; x < num && image->dx >= 0; x++) {
396                         info->fbops->fb_imageblit(info, image);
397                         image->dx -= image->width + 8;
398                 }
399         } else if (rotate == FB_ROTATE_CW) {
400                 for (x = 0;
401                      x < num && image->dy + image->height <= info->var.yres;
402                      x++) {
403                         info->fbops->fb_imageblit(info, image);
404                         image->dy += image->height + 8;
405                 }
406         } else if (rotate == FB_ROTATE_CCW) {
407                 for (x = 0; x < num && image->dy >= 0; x++) {
408                         info->fbops->fb_imageblit(info, image);
409                         image->dy -= image->height + 8;
410                 }
411         }
412 }
413
414 int fb_prepare_logo(struct fb_info *info, int rotate)
415 {
416         int depth = fb_get_color_depth(&info->var, &info->fix);
417         int yres;
418
419         memset(&fb_logo, 0, sizeof(struct logo_data));
420
421         if (info->flags & FBINFO_MISC_TILEBLITTING ||
422             info->flags & FBINFO_MODULE)
423                 return 0;
424
425         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
426                 depth = info->var.blue.length;
427                 if (info->var.red.length < depth)
428                         depth = info->var.red.length;
429                 if (info->var.green.length < depth)
430                         depth = info->var.green.length;
431         }
432
433         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
434                 /* assume console colormap */
435                 depth = 4;
436         }
437
438         if (depth >= 8) {
439                 switch (info->fix.visual) {
440                 case FB_VISUAL_TRUECOLOR:
441                         fb_logo.needs_truepalette = 1;
442                         break;
443                 case FB_VISUAL_DIRECTCOLOR:
444                         fb_logo.needs_directpalette = 1;
445                         fb_logo.needs_cmapreset = 1;
446                         break;
447                 case FB_VISUAL_PSEUDOCOLOR:
448                         fb_logo.needs_cmapreset = 1;
449                         break;
450                 }
451         }
452
453         /* Return if no suitable logo was found */
454         fb_logo.logo = fb_find_logo(depth);
455
456         if (!fb_logo.logo) {
457                 return 0;
458         }
459         
460         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
461                 yres = info->var.yres;
462         else
463                 yres = info->var.xres;
464
465         if (fb_logo.logo->height > yres) {
466                 fb_logo.logo = NULL;
467                 return 0;
468         }
469
470         /* What depth we asked for might be different from what we get */
471         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
472                 fb_logo.depth = 8;
473         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
474                 fb_logo.depth = 4;
475         else
476                 fb_logo.depth = 1;              
477         return fb_logo.logo->height;
478 }
479
480 int fb_show_logo(struct fb_info *info, int rotate)
481 {
482         u32 *palette = NULL, *saved_pseudo_palette = NULL;
483         unsigned char *logo_new = NULL, *logo_rotate = NULL;
484         struct fb_image image;
485
486         /* Return if the frame buffer is not mapped or suspended */
487         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING ||
488             info->flags & FBINFO_MODULE)
489                 return 0;
490
491         image.depth = 8;
492         image.data = fb_logo.logo->data;
493
494         if (fb_logo.needs_cmapreset)
495                 fb_set_logocmap(info, fb_logo.logo);
496
497         if (fb_logo.needs_truepalette || 
498             fb_logo.needs_directpalette) {
499                 palette = kmalloc(256 * 4, GFP_KERNEL);
500                 if (palette == NULL)
501                         return 0;
502
503                 if (fb_logo.needs_truepalette)
504                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
505                 else
506                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
507
508                 saved_pseudo_palette = info->pseudo_palette;
509                 info->pseudo_palette = palette;
510         }
511
512         if (fb_logo.depth <= 4) {
513                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height, 
514                                    GFP_KERNEL);
515                 if (logo_new == NULL) {
516                         kfree(palette);
517                         if (saved_pseudo_palette)
518                                 info->pseudo_palette = saved_pseudo_palette;
519                         return 0;
520                 }
521                 image.data = logo_new;
522                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
523         }
524
525         image.dx = 0;
526         image.dy = 0;
527         image.width = fb_logo.logo->width;
528         image.height = fb_logo.logo->height;
529
530         if (rotate) {
531                 logo_rotate = kmalloc(fb_logo.logo->width *
532                                       fb_logo.logo->height, GFP_KERNEL);
533                 if (logo_rotate)
534                         fb_rotate_logo(info, logo_rotate, &image, rotate);
535         }
536
537         fb_do_show_logo(info, &image, rotate, num_online_cpus());
538
539         kfree(palette);
540         if (saved_pseudo_palette != NULL)
541                 info->pseudo_palette = saved_pseudo_palette;
542         kfree(logo_new);
543         kfree(logo_rotate);
544         return fb_logo.logo->height;
545 }
546 #else
547 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
548 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
549 #endif /* CONFIG_LOGO */
550
551 static int fbmem_read_proc(char *buf, char **start, off_t offset,
552                            int len, int *eof, void *private)
553 {
554         struct fb_info **fi;
555         int clen;
556
557         clen = 0;
558         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
559              fi++)
560                 if (*fi)
561                         clen += sprintf(buf + clen, "%d %s\n",
562                                         (*fi)->node,
563                                         (*fi)->fix.id);
564         *start = buf + offset;
565         if (clen > offset)
566                 clen -= offset;
567         else
568                 clen = 0;
569         return clen < len ? clen : len;
570 }
571
572 static ssize_t
573 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
574 {
575         unsigned long p = *ppos;
576         struct inode *inode = file->f_path.dentry->d_inode;
577         int fbidx = iminor(inode);
578         struct fb_info *info = registered_fb[fbidx];
579         u32 *buffer, *dst;
580         u32 __iomem *src;
581         int c, i, cnt = 0, err = 0;
582         unsigned long total_size;
583
584         if (!info || ! info->screen_base)
585                 return -ENODEV;
586
587         if (info->state != FBINFO_STATE_RUNNING)
588                 return -EPERM;
589
590         if (info->fbops->fb_read)
591                 return info->fbops->fb_read(info, buf, count, ppos);
592         
593         total_size = info->screen_size;
594
595         if (total_size == 0)
596                 total_size = info->fix.smem_len;
597
598         if (p >= total_size)
599                 return 0;
600
601         if (count >= total_size)
602                 count = total_size;
603
604         if (count + p > total_size)
605                 count = total_size - p;
606
607         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
608                          GFP_KERNEL);
609         if (!buffer)
610                 return -ENOMEM;
611
612         src = (u32 __iomem *) (info->screen_base + p);
613
614         if (info->fbops->fb_sync)
615                 info->fbops->fb_sync(info);
616
617         while (count) {
618                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
619                 dst = buffer;
620                 for (i = c >> 2; i--; )
621                         *dst++ = fb_readl(src++);
622                 if (c & 3) {
623                         u8 *dst8 = (u8 *) dst;
624                         u8 __iomem *src8 = (u8 __iomem *) src;
625
626                         for (i = c & 3; i--;)
627                                 *dst8++ = fb_readb(src8++);
628
629                         src = (u32 __iomem *) src8;
630                 }
631
632                 if (copy_to_user(buf, buffer, c)) {
633                         err = -EFAULT;
634                         break;
635                 }
636                 *ppos += c;
637                 buf += c;
638                 cnt += c;
639                 count -= c;
640         }
641
642         kfree(buffer);
643
644         return (err) ? err : cnt;
645 }
646
647 static ssize_t
648 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
649 {
650         unsigned long p = *ppos;
651         struct inode *inode = file->f_path.dentry->d_inode;
652         int fbidx = iminor(inode);
653         struct fb_info *info = registered_fb[fbidx];
654         u32 *buffer, *src;
655         u32 __iomem *dst;
656         int c, i, cnt = 0, err = 0;
657         unsigned long total_size;
658
659         if (!info || !info->screen_base)
660                 return -ENODEV;
661
662         if (info->state != FBINFO_STATE_RUNNING)
663                 return -EPERM;
664
665         if (info->fbops->fb_write)
666                 return info->fbops->fb_write(info, buf, count, ppos);
667         
668         total_size = info->screen_size;
669
670         if (total_size == 0)
671                 total_size = info->fix.smem_len;
672
673         if (p > total_size)
674                 return -EFBIG;
675
676         if (count > total_size) {
677                 err = -EFBIG;
678                 count = total_size;
679         }
680
681         if (count + p > total_size) {
682                 if (!err)
683                         err = -ENOSPC;
684
685                 count = total_size - p;
686         }
687
688         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
689                          GFP_KERNEL);
690         if (!buffer)
691                 return -ENOMEM;
692
693         dst = (u32 __iomem *) (info->screen_base + p);
694
695         if (info->fbops->fb_sync)
696                 info->fbops->fb_sync(info);
697
698         while (count) {
699                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
700                 src = buffer;
701
702                 if (copy_from_user(src, buf, c)) {
703                         err = -EFAULT;
704                         break;
705                 }
706
707                 for (i = c >> 2; i--; )
708                         fb_writel(*src++, dst++);
709
710                 if (c & 3) {
711                         u8 *src8 = (u8 *) src;
712                         u8 __iomem *dst8 = (u8 __iomem *) dst;
713
714                         for (i = c & 3; i--; )
715                                 fb_writeb(*src8++, dst8++);
716
717                         dst = (u32 __iomem *) dst8;
718                 }
719
720                 *ppos += c;
721                 buf += c;
722                 cnt += c;
723                 count -= c;
724         }
725
726         kfree(buffer);
727
728         return (cnt) ? cnt : err;
729 }
730
731 #ifdef CONFIG_KMOD
732 static void try_to_load(int fb)
733 {
734         request_module("fb%d", fb);
735 }
736 #endif /* CONFIG_KMOD */
737
738 int
739 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
740 {
741         struct fb_fix_screeninfo *fix = &info->fix;
742         int xoffset = var->xoffset;
743         int yoffset = var->yoffset;
744         int err = 0, yres = info->var.yres;
745
746         if (var->yoffset > 0) {
747                 if (var->vmode & FB_VMODE_YWRAP) {
748                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
749                                 err = -EINVAL;
750                         else
751                                 yres = 0;
752                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
753                         err = -EINVAL;
754         }
755
756         if (var->xoffset > 0 && (!fix->xpanstep ||
757                                  (var->xoffset % fix->xpanstep)))
758                 err = -EINVAL;
759
760         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
761             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
762             var->xoffset + info->var.xres > info->var.xres_virtual)
763                 return -EINVAL;
764
765         if ((err = info->fbops->fb_pan_display(var, info)))
766                 return err;
767         info->var.xoffset = var->xoffset;
768         info->var.yoffset = var->yoffset;
769         if (var->vmode & FB_VMODE_YWRAP)
770                 info->var.vmode |= FB_VMODE_YWRAP;
771         else
772                 info->var.vmode &= ~FB_VMODE_YWRAP;
773         return 0;
774 }
775
776 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
777                          u32 activate)
778 {
779         struct fb_event event;
780         struct fb_blit_caps caps, fbcaps;
781         int err = 0;
782
783         memset(&caps, 0, sizeof(caps));
784         memset(&fbcaps, 0, sizeof(fbcaps));
785         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
786         event.info = info;
787         event.data = &caps;
788         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
789         info->fbops->fb_get_caps(info, &fbcaps, var);
790
791         if (((fbcaps.x ^ caps.x) & caps.x) ||
792             ((fbcaps.y ^ caps.y) & caps.y) ||
793             (fbcaps.len < caps.len))
794                 err = -EINVAL;
795
796         return err;
797 }
798
799 int
800 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
801 {
802         int flags = info->flags;
803         int ret = 0;
804
805         if (var->activate & FB_ACTIVATE_INV_MODE) {
806                 struct fb_videomode mode1, mode2;
807
808                 fb_var_to_videomode(&mode1, var);
809                 fb_var_to_videomode(&mode2, &info->var);
810                 /* make sure we don't delete the videomode of current var */
811                 ret = fb_mode_is_equal(&mode1, &mode2);
812
813                 if (!ret) {
814                     struct fb_event event;
815
816                     event.info = info;
817                     event.data = &mode1;
818                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
819                 }
820
821                 if (!ret)
822                     fb_delete_videomode(&mode1, &info->modelist);
823
824
825                 ret = (ret) ? -EINVAL : 0;
826                 goto done;
827         }
828
829         if ((var->activate & FB_ACTIVATE_FORCE) ||
830             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
831                 u32 activate = var->activate;
832
833                 if (!info->fbops->fb_check_var) {
834                         *var = info->var;
835                         goto done;
836                 }
837
838                 ret = info->fbops->fb_check_var(var, info);
839
840                 if (ret)
841                         goto done;
842
843                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
844                         struct fb_videomode mode;
845
846                         if (info->fbops->fb_get_caps) {
847                                 ret = fb_check_caps(info, var, activate);
848
849                                 if (ret)
850                                         goto done;
851                         }
852
853                         info->var = *var;
854
855                         if (info->fbops->fb_set_par)
856                                 info->fbops->fb_set_par(info);
857
858                         fb_pan_display(info, &info->var);
859                         fb_set_cmap(&info->cmap, info);
860                         fb_var_to_videomode(&mode, &info->var);
861
862                         if (info->modelist.prev && info->modelist.next &&
863                             !list_empty(&info->modelist))
864                                 ret = fb_add_videomode(&mode, &info->modelist);
865
866                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
867                                 struct fb_event event;
868                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
869                                         FB_EVENT_MODE_CHANGE_ALL :
870                                         FB_EVENT_MODE_CHANGE;
871
872                                 info->flags &= ~FBINFO_MISC_USEREVENT;
873                                 event.info = info;
874                                 fb_notifier_call_chain(evnt, &event);
875                         }
876                 }
877         }
878
879  done:
880         return ret;
881 }
882
883 int
884 fb_blank(struct fb_info *info, int blank)
885 {       
886         int ret = -EINVAL;
887
888         if (blank > FB_BLANK_POWERDOWN)
889                 blank = FB_BLANK_POWERDOWN;
890
891         if (info->fbops->fb_blank)
892                 ret = info->fbops->fb_blank(blank, info);
893
894         if (!ret) {
895                 struct fb_event event;
896
897                 event.info = info;
898                 event.data = &blank;
899                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
900         }
901
902         return ret;
903 }
904
905 static int 
906 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
907          unsigned long arg)
908 {
909         int fbidx = iminor(inode);
910         struct fb_info *info = registered_fb[fbidx];
911         struct fb_ops *fb = info->fbops;
912         struct fb_var_screeninfo var;
913         struct fb_fix_screeninfo fix;
914         struct fb_con2fbmap con2fb;
915         struct fb_cmap_user cmap;
916         struct fb_event event;
917         void __user *argp = (void __user *)arg;
918         int i;
919         
920         if (!fb)
921                 return -ENODEV;
922         switch (cmd) {
923         case FBIOGET_VSCREENINFO:
924                 return copy_to_user(argp, &info->var,
925                                     sizeof(var)) ? -EFAULT : 0;
926         case FBIOPUT_VSCREENINFO:
927                 if (copy_from_user(&var, argp, sizeof(var)))
928                         return -EFAULT;
929                 acquire_console_sem();
930                 info->flags |= FBINFO_MISC_USEREVENT;
931                 i = fb_set_var(info, &var);
932                 info->flags &= ~FBINFO_MISC_USEREVENT;
933                 release_console_sem();
934                 if (i) return i;
935                 if (copy_to_user(argp, &var, sizeof(var)))
936                         return -EFAULT;
937                 return 0;
938         case FBIOGET_FSCREENINFO:
939                 return copy_to_user(argp, &info->fix,
940                                     sizeof(fix)) ? -EFAULT : 0;
941         case FBIOPUTCMAP:
942                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
943                         return -EFAULT;
944                 return (fb_set_user_cmap(&cmap, info));
945         case FBIOGETCMAP:
946                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
947                         return -EFAULT;
948                 return fb_cmap_to_user(&info->cmap, &cmap);
949         case FBIOPAN_DISPLAY:
950                 if (copy_from_user(&var, argp, sizeof(var)))
951                         return -EFAULT;
952                 acquire_console_sem();
953                 i = fb_pan_display(info, &var);
954                 release_console_sem();
955                 if (i)
956                         return i;
957                 if (copy_to_user(argp, &var, sizeof(var)))
958                         return -EFAULT;
959                 return 0;
960         case FBIO_CURSOR:
961                 return -EINVAL;
962         case FBIOGET_CON2FBMAP:
963                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
964                         return -EFAULT;
965                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
966                     return -EINVAL;
967                 con2fb.framebuffer = -1;
968                 event.info = info;
969                 event.data = &con2fb;
970                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
971                 return copy_to_user(argp, &con2fb,
972                                     sizeof(con2fb)) ? -EFAULT : 0;
973         case FBIOPUT_CON2FBMAP:
974                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
975                         return - EFAULT;
976                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
977                     return -EINVAL;
978                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
979                     return -EINVAL;
980 #ifdef CONFIG_KMOD
981                 if (!registered_fb[con2fb.framebuffer])
982                     try_to_load(con2fb.framebuffer);
983 #endif /* CONFIG_KMOD */
984                 if (!registered_fb[con2fb.framebuffer])
985                     return -EINVAL;
986                 event.info = info;
987                 event.data = &con2fb;
988                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
989                                               &event);
990         case FBIOBLANK:
991                 acquire_console_sem();
992                 info->flags |= FBINFO_MISC_USEREVENT;
993                 i = fb_blank(info, arg);
994                 info->flags &= ~FBINFO_MISC_USEREVENT;
995                 release_console_sem();
996                 return i;
997         default:
998                 if (fb->fb_ioctl == NULL)
999                         return -EINVAL;
1000                 return fb->fb_ioctl(info, cmd, arg);
1001         }
1002 }
1003
1004 #ifdef CONFIG_COMPAT
1005 struct fb_fix_screeninfo32 {
1006         char                    id[16];
1007         compat_caddr_t          smem_start;
1008         u32                     smem_len;
1009         u32                     type;
1010         u32                     type_aux;
1011         u32                     visual;
1012         u16                     xpanstep;
1013         u16                     ypanstep;
1014         u16                     ywrapstep;
1015         u32                     line_length;
1016         compat_caddr_t          mmio_start;
1017         u32                     mmio_len;
1018         u32                     accel;
1019         u16                     reserved[3];
1020 };
1021
1022 struct fb_cmap32 {
1023         u32                     start;
1024         u32                     len;
1025         compat_caddr_t  red;
1026         compat_caddr_t  green;
1027         compat_caddr_t  blue;
1028         compat_caddr_t  transp;
1029 };
1030
1031 static int fb_getput_cmap(struct inode *inode, struct file *file,
1032                         unsigned int cmd, unsigned long arg)
1033 {
1034         struct fb_cmap_user __user *cmap;
1035         struct fb_cmap32 __user *cmap32;
1036         __u32 data;
1037         int err;
1038
1039         cmap = compat_alloc_user_space(sizeof(*cmap));
1040         cmap32 = compat_ptr(arg);
1041
1042         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1043                 return -EFAULT;
1044
1045         if (get_user(data, &cmap32->red) ||
1046             put_user(compat_ptr(data), &cmap->red) ||
1047             get_user(data, &cmap32->green) ||
1048             put_user(compat_ptr(data), &cmap->green) ||
1049             get_user(data, &cmap32->blue) ||
1050             put_user(compat_ptr(data), &cmap->blue) ||
1051             get_user(data, &cmap32->transp) ||
1052             put_user(compat_ptr(data), &cmap->transp))
1053                 return -EFAULT;
1054
1055         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1056
1057         if (!err) {
1058                 if (copy_in_user(&cmap32->start,
1059                                  &cmap->start,
1060                                  2 * sizeof(__u32)))
1061                         err = -EFAULT;
1062         }
1063         return err;
1064 }
1065
1066 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1067                                   struct fb_fix_screeninfo32 __user *fix32)
1068 {
1069         __u32 data;
1070         int err;
1071
1072         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1073
1074         data = (__u32) (unsigned long) fix->smem_start;
1075         err |= put_user(data, &fix32->smem_start);
1076
1077         err |= put_user(fix->smem_len, &fix32->smem_len);
1078         err |= put_user(fix->type, &fix32->type);
1079         err |= put_user(fix->type_aux, &fix32->type_aux);
1080         err |= put_user(fix->visual, &fix32->visual);
1081         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1082         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1083         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1084         err |= put_user(fix->line_length, &fix32->line_length);
1085
1086         data = (__u32) (unsigned long) fix->mmio_start;
1087         err |= put_user(data, &fix32->mmio_start);
1088
1089         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1090         err |= put_user(fix->accel, &fix32->accel);
1091         err |= copy_to_user(fix32->reserved, fix->reserved,
1092                             sizeof(fix->reserved));
1093
1094         return err;
1095 }
1096
1097 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1098                                 unsigned int cmd, unsigned long arg)
1099 {
1100         mm_segment_t old_fs;
1101         struct fb_fix_screeninfo fix;
1102         struct fb_fix_screeninfo32 __user *fix32;
1103         int err;
1104
1105         fix32 = compat_ptr(arg);
1106
1107         old_fs = get_fs();
1108         set_fs(KERNEL_DS);
1109         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1110         set_fs(old_fs);
1111
1112         if (!err)
1113                 err = do_fscreeninfo_to_user(&fix, fix32);
1114
1115         return err;
1116 }
1117
1118 static long
1119 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1120 {
1121         struct inode *inode = file->f_path.dentry->d_inode;
1122         int fbidx = iminor(inode);
1123         struct fb_info *info = registered_fb[fbidx];
1124         struct fb_ops *fb = info->fbops;
1125         long ret = -ENOIOCTLCMD;
1126
1127         lock_kernel();
1128         switch(cmd) {
1129         case FBIOGET_VSCREENINFO:
1130         case FBIOPUT_VSCREENINFO:
1131         case FBIOPAN_DISPLAY:
1132         case FBIOGET_CON2FBMAP:
1133         case FBIOPUT_CON2FBMAP:
1134                 arg = (unsigned long) compat_ptr(arg);
1135         case FBIOBLANK:
1136                 ret = fb_ioctl(inode, file, cmd, arg);
1137                 break;
1138
1139         case FBIOGET_FSCREENINFO:
1140                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1141                 break;
1142
1143         case FBIOGETCMAP:
1144         case FBIOPUTCMAP:
1145                 ret = fb_getput_cmap(inode, file, cmd, arg);
1146                 break;
1147
1148         default:
1149                 if (fb->fb_compat_ioctl)
1150                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1151                 break;
1152         }
1153         unlock_kernel();
1154         return ret;
1155 }
1156 #endif
1157
1158 static int 
1159 fb_mmap(struct file *file, struct vm_area_struct * vma)
1160 {
1161         int fbidx = iminor(file->f_path.dentry->d_inode);
1162         struct fb_info *info = registered_fb[fbidx];
1163         struct fb_ops *fb = info->fbops;
1164         unsigned long off;
1165 #if !defined(__sparc__) || defined(__sparc_v9__)
1166         unsigned long start;
1167         u32 len;
1168 #endif
1169
1170         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1171                 return -EINVAL;
1172         off = vma->vm_pgoff << PAGE_SHIFT;
1173         if (!fb)
1174                 return -ENODEV;
1175         if (fb->fb_mmap) {
1176                 int res;
1177                 lock_kernel();
1178                 res = fb->fb_mmap(info, vma);
1179                 unlock_kernel();
1180                 return res;
1181         }
1182
1183 #if defined(__sparc__) && !defined(__sparc_v9__)
1184         /* Should never get here, all fb drivers should have their own
1185            mmap routines */
1186         return -EINVAL;
1187 #else
1188         /* !sparc32... */
1189         lock_kernel();
1190
1191         /* frame buffer memory */
1192         start = info->fix.smem_start;
1193         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1194         if (off >= len) {
1195                 /* memory mapped io */
1196                 off -= len;
1197                 if (info->var.accel_flags) {
1198                         unlock_kernel();
1199                         return -EINVAL;
1200                 }
1201                 start = info->fix.mmio_start;
1202                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1203         }
1204         unlock_kernel();
1205         start &= PAGE_MASK;
1206         if ((vma->vm_end - vma->vm_start + off) > len)
1207                 return -EINVAL;
1208         off += start;
1209         vma->vm_pgoff = off >> PAGE_SHIFT;
1210         /* This is an IO map - tell maydump to skip this VMA */
1211         vma->vm_flags |= VM_IO | VM_RESERVED;
1212 #if defined(__mc68000__)
1213 #if defined(CONFIG_SUN3)
1214         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1215 #elif defined(CONFIG_MMU)
1216         if (CPU_IS_020_OR_030)
1217                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1218         if (CPU_IS_040_OR_060) {
1219                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1220                 /* Use no-cache mode, serialized */
1221                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1222         }
1223 #endif
1224 #elif defined(__powerpc__)
1225         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1226                                                  vma->vm_end - vma->vm_start,
1227                                                  vma->vm_page_prot);
1228 #elif defined(__alpha__)
1229         /* Caching is off in the I/O space quadrant by design.  */
1230 #elif defined(__i386__) || defined(__x86_64__)
1231         if (boot_cpu_data.x86 > 3)
1232                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1233 #elif defined(__mips__) || defined(__sparc_v9__)
1234         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1235 #elif defined(__hppa__)
1236         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1237 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1238         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1239 #elif defined(__avr32__)
1240         vma->vm_page_prot = __pgprot((pgprot_val(vma->vm_page_prot)
1241                                       & ~_PAGE_CACHABLE)
1242                                      | (_PAGE_BUFFER | _PAGE_DIRTY));
1243 #elif defined(__ia64__)
1244         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1245                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1246         else
1247                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1248 #else
1249 #warning What do we have to do here??
1250 #endif
1251         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1252                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1253                 return -EAGAIN;
1254         return 0;
1255 #endif /* !sparc32 */
1256 }
1257
1258 static int
1259 fb_open(struct inode *inode, struct file *file)
1260 {
1261         int fbidx = iminor(inode);
1262         struct fb_info *info;
1263         int res = 0;
1264
1265         if (fbidx >= FB_MAX)
1266                 return -ENODEV;
1267 #ifdef CONFIG_KMOD
1268         if (!(info = registered_fb[fbidx]))
1269                 try_to_load(fbidx);
1270 #endif /* CONFIG_KMOD */
1271         if (!(info = registered_fb[fbidx]))
1272                 return -ENODEV;
1273         if (!try_module_get(info->fbops->owner))
1274                 return -ENODEV;
1275         file->private_data = info;
1276         if (info->fbops->fb_open) {
1277                 res = info->fbops->fb_open(info,1);
1278                 if (res)
1279                         module_put(info->fbops->owner);
1280         }
1281         return res;
1282 }
1283
1284 static int 
1285 fb_release(struct inode *inode, struct file *file)
1286 {
1287         struct fb_info * const info = file->private_data;
1288
1289         lock_kernel();
1290         if (info->fbops->fb_release)
1291                 info->fbops->fb_release(info,1);
1292         module_put(info->fbops->owner);
1293         unlock_kernel();
1294         return 0;
1295 }
1296
1297 static const struct file_operations fb_fops = {
1298         .owner =        THIS_MODULE,
1299         .read =         fb_read,
1300         .write =        fb_write,
1301         .ioctl =        fb_ioctl,
1302 #ifdef CONFIG_COMPAT
1303         .compat_ioctl = fb_compat_ioctl,
1304 #endif
1305         .mmap =         fb_mmap,
1306         .open =         fb_open,
1307         .release =      fb_release,
1308 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1309         .get_unmapped_area = get_fb_unmapped_area,
1310 #endif
1311 #ifdef CONFIG_FB_DEFERRED_IO
1312         .fsync =        fb_deferred_io_fsync,
1313 #endif
1314 };
1315
1316 struct class *fb_class;
1317 EXPORT_SYMBOL(fb_class);
1318 /**
1319  *      register_framebuffer - registers a frame buffer device
1320  *      @fb_info: frame buffer info structure
1321  *
1322  *      Registers a frame buffer device @fb_info.
1323  *
1324  *      Returns negative errno on error, or zero for success.
1325  *
1326  */
1327
1328 int
1329 register_framebuffer(struct fb_info *fb_info)
1330 {
1331         int i;
1332         struct fb_event event;
1333         struct fb_videomode mode;
1334
1335         if (num_registered_fb == FB_MAX)
1336                 return -ENXIO;
1337         num_registered_fb++;
1338         for (i = 0 ; i < FB_MAX; i++)
1339                 if (!registered_fb[i])
1340                         break;
1341         fb_info->node = i;
1342
1343         fb_info->dev = device_create(fb_class, fb_info->device,
1344                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1345         if (IS_ERR(fb_info->dev)) {
1346                 /* Not fatal */
1347                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1348                 fb_info->dev = NULL;
1349         } else
1350                 fb_init_device(fb_info);
1351
1352         if (fb_info->pixmap.addr == NULL) {
1353                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1354                 if (fb_info->pixmap.addr) {
1355                         fb_info->pixmap.size = FBPIXMAPSIZE;
1356                         fb_info->pixmap.buf_align = 1;
1357                         fb_info->pixmap.scan_align = 1;
1358                         fb_info->pixmap.access_align = 32;
1359                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1360                 }
1361         }       
1362         fb_info->pixmap.offset = 0;
1363
1364         if (!fb_info->pixmap.blit_x)
1365                 fb_info->pixmap.blit_x = ~(u32)0;
1366
1367         if (!fb_info->pixmap.blit_y)
1368                 fb_info->pixmap.blit_y = ~(u32)0;
1369
1370         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1371                 INIT_LIST_HEAD(&fb_info->modelist);
1372
1373         fb_var_to_videomode(&mode, &fb_info->var);
1374         fb_add_videomode(&mode, &fb_info->modelist);
1375         registered_fb[i] = fb_info;
1376
1377         event.info = fb_info;
1378         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1379         return 0;
1380 }
1381
1382
1383 /**
1384  *      unregister_framebuffer - releases a frame buffer device
1385  *      @fb_info: frame buffer info structure
1386  *
1387  *      Unregisters a frame buffer device @fb_info.
1388  *
1389  *      Returns negative errno on error, or zero for success.
1390  *
1391  */
1392
1393 int
1394 unregister_framebuffer(struct fb_info *fb_info)
1395 {
1396         struct fb_event event;
1397         int i;
1398
1399         i = fb_info->node;
1400         if (!registered_fb[i])
1401                 return -EINVAL;
1402
1403         if (fb_info->pixmap.addr &&
1404             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1405                 kfree(fb_info->pixmap.addr);
1406         fb_destroy_modelist(&fb_info->modelist);
1407         registered_fb[i]=NULL;
1408         num_registered_fb--;
1409         fb_cleanup_device(fb_info);
1410         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1411         event.info = fb_info;
1412         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1413         return 0;
1414 }
1415
1416 /**
1417  *      fb_set_suspend - low level driver signals suspend
1418  *      @info: framebuffer affected
1419  *      @state: 0 = resuming, !=0 = suspending
1420  *
1421  *      This is meant to be used by low level drivers to
1422  *      signal suspend/resume to the core & clients.
1423  *      It must be called with the console semaphore held
1424  */
1425 void fb_set_suspend(struct fb_info *info, int state)
1426 {
1427         struct fb_event event;
1428
1429         event.info = info;
1430         if (state) {
1431                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1432                 info->state = FBINFO_STATE_SUSPENDED;
1433         } else {
1434                 info->state = FBINFO_STATE_RUNNING;
1435                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1436         }
1437 }
1438
1439 /**
1440  *      fbmem_init - init frame buffer subsystem
1441  *
1442  *      Initialize the frame buffer subsystem.
1443  *
1444  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1445  *
1446  */
1447
1448 static int __init
1449 fbmem_init(void)
1450 {
1451         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1452
1453         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1454                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1455
1456         fb_class = class_create(THIS_MODULE, "graphics");
1457         if (IS_ERR(fb_class)) {
1458                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1459                 fb_class = NULL;
1460         }
1461         return 0;
1462 }
1463
1464 #ifdef MODULE
1465 module_init(fbmem_init);
1466 static void __exit
1467 fbmem_exit(void)
1468 {
1469         class_destroy(fb_class);
1470         unregister_chrdev(FB_MAJOR, "fb");
1471 }
1472
1473 module_exit(fbmem_exit);
1474 MODULE_LICENSE("GPL");
1475 MODULE_DESCRIPTION("Framebuffer base");
1476 #else
1477 subsys_initcall(fbmem_init);
1478 #endif
1479
1480 int fb_new_modelist(struct fb_info *info)
1481 {
1482         struct fb_event event;
1483         struct fb_var_screeninfo var = info->var;
1484         struct list_head *pos, *n;
1485         struct fb_modelist *modelist;
1486         struct fb_videomode *m, mode;
1487         int err = 1;
1488
1489         list_for_each_safe(pos, n, &info->modelist) {
1490                 modelist = list_entry(pos, struct fb_modelist, list);
1491                 m = &modelist->mode;
1492                 fb_videomode_to_var(&var, m);
1493                 var.activate = FB_ACTIVATE_TEST;
1494                 err = fb_set_var(info, &var);
1495                 fb_var_to_videomode(&mode, &var);
1496                 if (err || !fb_mode_is_equal(m, &mode)) {
1497                         list_del(pos);
1498                         kfree(pos);
1499                 }
1500         }
1501
1502         err = 1;
1503
1504         if (!list_empty(&info->modelist)) {
1505                 event.info = info;
1506                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1507         }
1508
1509         return err;
1510 }
1511
1512 static char *video_options[FB_MAX] __read_mostly;
1513 static int ofonly __read_mostly;
1514
1515 extern const char *global_mode_option;
1516
1517 /**
1518  * fb_get_options - get kernel boot parameters
1519  * @name:   framebuffer name as it would appear in
1520  *          the boot parameter line
1521  *          (video=<name>:<options>)
1522  * @option: the option will be stored here
1523  *
1524  * NOTE: Needed to maintain backwards compatibility
1525  */
1526 int fb_get_options(char *name, char **option)
1527 {
1528         char *opt, *options = NULL;
1529         int opt_len, retval = 0;
1530         int name_len = strlen(name), i;
1531
1532         if (name_len && ofonly && strncmp(name, "offb", 4))
1533                 retval = 1;
1534
1535         if (name_len && !retval) {
1536                 for (i = 0; i < FB_MAX; i++) {
1537                         if (video_options[i] == NULL)
1538                                 continue;
1539                         opt_len = strlen(video_options[i]);
1540                         if (!opt_len)
1541                                 continue;
1542                         opt = video_options[i];
1543                         if (!strncmp(name, opt, name_len) &&
1544                             opt[name_len] == ':')
1545                                 options = opt + name_len + 1;
1546                 }
1547         }
1548         if (options && !strncmp(options, "off", 3))
1549                 retval = 1;
1550
1551         if (option)
1552                 *option = options;
1553
1554         return retval;
1555 }
1556
1557 #ifndef MODULE
1558 /**
1559  *      video_setup - process command line options
1560  *      @options: string of options
1561  *
1562  *      Process command line options for frame buffer subsystem.
1563  *
1564  *      NOTE: This function is a __setup and __init function.
1565  *            It only stores the options.  Drivers have to call
1566  *            fb_get_options() as necessary.
1567  *
1568  *      Returns zero.
1569  *
1570  */
1571 static int __init video_setup(char *options)
1572 {
1573         int i, global = 0;
1574
1575         if (!options || !*options)
1576                 global = 1;
1577
1578         if (!global && !strncmp(options, "ofonly", 6)) {
1579                 ofonly = 1;
1580                 global = 1;
1581         }
1582
1583         if (!global && !strstr(options, "fb:")) {
1584                 global_mode_option = options;
1585                 global = 1;
1586         }
1587
1588         if (!global) {
1589                 for (i = 0; i < FB_MAX; i++) {
1590                         if (video_options[i] == NULL) {
1591                                 video_options[i] = options;
1592                                 break;
1593                         }
1594
1595                 }
1596         }
1597
1598         return 1;
1599 }
1600 __setup("video=", video_setup);
1601 #endif
1602
1603     /*
1604      *  Visible symbols for modules
1605      */
1606
1607 EXPORT_SYMBOL(register_framebuffer);
1608 EXPORT_SYMBOL(unregister_framebuffer);
1609 EXPORT_SYMBOL(num_registered_fb);
1610 EXPORT_SYMBOL(registered_fb);
1611 EXPORT_SYMBOL(fb_prepare_logo);
1612 EXPORT_SYMBOL(fb_show_logo);
1613 EXPORT_SYMBOL(fb_set_var);
1614 EXPORT_SYMBOL(fb_blank);
1615 EXPORT_SYMBOL(fb_pan_display);
1616 EXPORT_SYMBOL(fb_get_buffer_offset);
1617 EXPORT_SYMBOL(fb_set_suspend);
1618 EXPORT_SYMBOL(fb_get_options);
1619
1620 MODULE_LICENSE("GPL");