Merge branch 'master' of /usr/src/ntfs-2.6/
[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/config.h>
15 #include <linux/module.h>
16
17 #include <linux/compat.h>
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/sched.h>
21 #include <linux/smp_lock.h>
22 #include <linux/kernel.h>
23 #include <linux/major.h>
24 #include <linux/slab.h>
25 #include <linux/mm.h>
26 #include <linux/mman.h>
27 #include <linux/tty.h>
28 #include <linux/init.h>
29 #include <linux/linux_logo.h>
30 #include <linux/proc_fs.h>
31 #include <linux/console.h>
32 #ifdef CONFIG_KMOD
33 #include <linux/kmod.h>
34 #endif
35 #include <linux/devfs_fs_kernel.h>
36 #include <linux/err.h>
37 #include <linux/kernel.h>
38 #include <linux/device.h>
39 #include <linux/efi.h>
40
41 #if defined(__mc68000__) || defined(CONFIG_APUS)
42 #include <asm/setup.h>
43 #endif
44
45 #include <asm/io.h>
46 #include <asm/uaccess.h>
47 #include <asm/page.h>
48 #include <asm/pgtable.h>
49
50 #include <linux/fb.h>
51
52     /*
53      *  Frame buffer device initialization and setup routines
54      */
55
56 #define FBPIXMAPSIZE    (1024 * 8)
57
58 static struct notifier_block *fb_notifier_list;
59 struct fb_info *registered_fb[FB_MAX];
60 int num_registered_fb;
61
62 /*
63  * Helpers
64  */
65
66 int fb_get_color_depth(struct fb_var_screeninfo *var,
67                        struct fb_fix_screeninfo *fix)
68 {
69         int depth = 0;
70
71         if (fix->visual == FB_VISUAL_MONO01 ||
72             fix->visual == FB_VISUAL_MONO10)
73                 depth = 1;
74         else {
75                 if (var->green.length == var->blue.length &&
76                     var->green.length == var->red.length &&
77                     var->green.offset == var->blue.offset &&
78                     var->green.offset == var->red.offset)
79                         depth = var->green.length;
80                 else
81                         depth = var->green.length + var->red.length +
82                                 var->blue.length;
83         }
84
85         return depth;
86 }
87 EXPORT_SYMBOL(fb_get_color_depth);
88
89 /*
90  * Data padding functions.
91  */
92 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
93 {
94         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
95 }
96 EXPORT_SYMBOL(fb_pad_aligned_buffer);
97
98 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
99                                 u32 shift_high, u32 shift_low, u32 mod)
100 {
101         u8 mask = (u8) (0xfff << shift_high), tmp;
102         int i, j;
103
104         for (i = height; i--; ) {
105                 for (j = 0; j < idx; j++) {
106                         tmp = dst[j];
107                         tmp &= mask;
108                         tmp |= *src >> shift_low;
109                         dst[j] = tmp;
110                         tmp = *src << shift_high;
111                         dst[j+1] = tmp;
112                         src++;
113                 }
114                 tmp = dst[idx];
115                 tmp &= mask;
116                 tmp |= *src >> shift_low;
117                 dst[idx] = tmp;
118                 if (shift_high < mod) {
119                         tmp = *src << shift_high;
120                         dst[idx+1] = tmp;
121                 }
122                 src++;
123                 dst += d_pitch;
124         }
125 }
126 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
127
128 /*
129  * we need to lock this section since fb_cursor
130  * may use fb_imageblit()
131  */
132 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
133 {
134         u32 align = buf->buf_align - 1, offset;
135         char *addr = buf->addr;
136
137         /* If IO mapped, we need to sync before access, no sharing of
138          * the pixmap is done
139          */
140         if (buf->flags & FB_PIXMAP_IO) {
141                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142                         info->fbops->fb_sync(info);
143                 return addr;
144         }
145
146         /* See if we fit in the remaining pixmap space */
147         offset = buf->offset + align;
148         offset &= ~align;
149         if (offset + size > buf->size) {
150                 /* We do not fit. In order to be able to re-use the buffer,
151                  * we must ensure no asynchronous DMA'ing or whatever operation
152                  * is in progress, we sync for that.
153                  */
154                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
155                         info->fbops->fb_sync(info);
156                 offset = 0;
157         }
158         buf->offset = offset + size;
159         addr += offset;
160
161         return addr;
162 }
163
164 #ifdef CONFIG_LOGO
165 #include <linux/linux_logo.h>
166
167 static inline unsigned safe_shift(unsigned d, int n)
168 {
169         return n < 0 ? d >> -n : d << n;
170 }
171
172 static void fb_set_logocmap(struct fb_info *info,
173                                    const struct linux_logo *logo)
174 {
175         struct fb_cmap palette_cmap;
176         u16 palette_green[16];
177         u16 palette_blue[16];
178         u16 palette_red[16];
179         int i, j, n;
180         const unsigned char *clut = logo->clut;
181
182         palette_cmap.start = 0;
183         palette_cmap.len = 16;
184         palette_cmap.red = palette_red;
185         palette_cmap.green = palette_green;
186         palette_cmap.blue = palette_blue;
187         palette_cmap.transp = NULL;
188
189         for (i = 0; i < logo->clutsize; i += n) {
190                 n = logo->clutsize - i;
191                 /* palette_cmap provides space for only 16 colors at once */
192                 if (n > 16)
193                         n = 16;
194                 palette_cmap.start = 32 + i;
195                 palette_cmap.len = n;
196                 for (j = 0; j < n; ++j) {
197                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
198                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
199                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
200                         clut += 3;
201                 }
202                 fb_set_cmap(&palette_cmap, info);
203         }
204 }
205
206 static void  fb_set_logo_truepalette(struct fb_info *info,
207                                             const struct linux_logo *logo,
208                                             u32 *palette)
209 {
210         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
211         unsigned char redmask, greenmask, bluemask;
212         int redshift, greenshift, blueshift;
213         int i;
214         const unsigned char *clut = logo->clut;
215
216         /*
217          * We have to create a temporary palette since console palette is only
218          * 16 colors long.
219          */
220         /* Bug: Doesn't obey msb_right ... (who needs that?) */
221         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
222         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
223         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
224         redshift   = info->var.red.offset   - (8 - info->var.red.length);
225         greenshift = info->var.green.offset - (8 - info->var.green.length);
226         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
227
228         for ( i = 0; i < logo->clutsize; i++) {
229                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
230                                  safe_shift((clut[1] & greenmask), greenshift) |
231                                  safe_shift((clut[2] & bluemask), blueshift));
232                 clut += 3;
233         }
234 }
235
236 static void fb_set_logo_directpalette(struct fb_info *info,
237                                              const struct linux_logo *logo,
238                                              u32 *palette)
239 {
240         int redshift, greenshift, blueshift;
241         int i;
242
243         redshift = info->var.red.offset;
244         greenshift = info->var.green.offset;
245         blueshift = info->var.blue.offset;
246
247         for (i = 32; i < logo->clutsize; i++)
248                 palette[i] = i << redshift | i << greenshift | i << blueshift;
249 }
250
251 static void fb_set_logo(struct fb_info *info,
252                                const struct linux_logo *logo, u8 *dst,
253                                int depth)
254 {
255         int i, j, k;
256         const u8 *src = logo->data;
257         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
258         u8 fg = 1, d;
259
260         if (fb_get_color_depth(&info->var, &info->fix) == 3)
261                 fg = 7;
262
263         if (info->fix.visual == FB_VISUAL_MONO01 ||
264             info->fix.visual == FB_VISUAL_MONO10)
265                 fg = ~((u8) (0xfff << info->var.green.length));
266
267         switch (depth) {
268         case 4:
269                 for (i = 0; i < logo->height; i++)
270                         for (j = 0; j < logo->width; src++) {
271                                 *dst++ = *src >> 4;
272                                 j++;
273                                 if (j < logo->width) {
274                                         *dst++ = *src & 0x0f;
275                                         j++;
276                                 }
277                         }
278                 break;
279         case 1:
280                 for (i = 0; i < logo->height; i++) {
281                         for (j = 0; j < logo->width; src++) {
282                                 d = *src ^ xor;
283                                 for (k = 7; k >= 0; k--) {
284                                         *dst++ = ((d >> k) & 1) ? fg : 0;
285                                         j++;
286                                 }
287                         }
288                 }
289                 break;
290         }
291 }
292
293 /*
294  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
295  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
296  * the visual format and color depth of the framebuffer, the DAC, the
297  * pseudo_palette, and the logo data will be adjusted accordingly.
298  *
299  * Case 1 - linux_logo_clut224:
300  * Color exceeds the number of console colors (16), thus we set the hardware DAC
301  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
302  *
303  * For visuals that require color info from the pseudo_palette, we also construct
304  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
305  * will be set.
306  *
307  * Case 2 - linux_logo_vga16:
308  * The number of colors just matches the console colors, thus there is no need
309  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
310  * each byte contains color information for two pixels (upper and lower nibble).
311  * To be consistent with fb_imageblit() usage, we therefore separate the two
312  * nibbles into separate bytes. The "depth" flag will be set to 4.
313  *
314  * Case 3 - linux_logo_mono:
315  * This is similar with Case 2.  Each byte contains information for 8 pixels.
316  * We isolate each bit and expand each into a byte. The "depth" flag will
317  * be set to 1.
318  */
319 static struct logo_data {
320         int depth;
321         int needs_directpalette;
322         int needs_truepalette;
323         int needs_cmapreset;
324         const struct linux_logo *logo;
325 } fb_logo;
326
327 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
328 {
329         u32 size = width * height, i;
330
331         out += size - 1;
332
333         for (i = size; i--; )
334                 *out-- = *in++;
335 }
336
337 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
338 {
339         int i, j, w = width - 1;
340
341         for (i = 0; i < height; i++)
342                 for (j = 0; j < width; j++)
343                         out[height * j + w - i] = *in++;
344 }
345
346 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
347 {
348         int i, j, w = width - 1;
349
350         for (i = 0; i < height; i++)
351                 for (j = 0; j < width; j++)
352                         out[height * (w - j) + i] = *in++;
353 }
354
355 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
356                            struct fb_image *image, int rotate)
357 {
358         u32 tmp;
359
360         if (rotate == FB_ROTATE_UD) {
361                 image->dx = info->var.xres - image->width;
362                 image->dy = info->var.yres - image->height;
363                 fb_rotate_logo_ud(image->data, dst, image->width,
364                                   image->height);
365         } else if (rotate == FB_ROTATE_CW) {
366                 tmp = image->width;
367                 image->width = image->height;
368                 image->height = tmp;
369                 image->dx = info->var.xres - image->height;
370                 fb_rotate_logo_cw(image->data, dst, image->width,
371                                   image->height);
372         } else if (rotate == FB_ROTATE_CCW) {
373                 tmp = image->width;
374                 image->width = image->height;
375                 image->height = tmp;
376                 image->dy = info->var.yres - image->width;
377                 fb_rotate_logo_ccw(image->data, dst, image->width,
378                                    image->height);
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)
386 {
387         int x;
388
389         if (rotate == FB_ROTATE_UR) {
390                 for (x = 0; x < num_online_cpus() &&
391                              x * (fb_logo.logo->width + 8) <=
392                              info->var.xres - fb_logo.logo->width; x++) {
393                         info->fbops->fb_imageblit(info, image);
394                         image->dx += fb_logo.logo->width + 8;
395                 }
396         } else if (rotate == FB_ROTATE_UD) {
397                 for (x = 0; x < num_online_cpus() &&
398                              x * (fb_logo.logo->width + 8) <=
399                              info->var.xres - fb_logo.logo->width; x++) {
400                         info->fbops->fb_imageblit(info, image);
401                         image->dx -= fb_logo.logo->width + 8;
402                 }
403         } else if (rotate == FB_ROTATE_CW) {
404                 for (x = 0; x < num_online_cpus() &&
405                              x * (fb_logo.logo->width + 8) <=
406                              info->var.yres - fb_logo.logo->width; x++) {
407                         info->fbops->fb_imageblit(info, image);
408                         image->dy += fb_logo.logo->width + 8;
409                 }
410         } else if (rotate == FB_ROTATE_CCW) {
411                 for (x = 0; x < num_online_cpus() &&
412                              x * (fb_logo.logo->width + 8) <=
413                              info->var.yres - fb_logo.logo->width; x++) {
414                         info->fbops->fb_imageblit(info, image);
415                         image->dy -= fb_logo.logo->width + 8;
416                 }
417         }
418 }
419
420 int fb_prepare_logo(struct fb_info *info, int rotate)
421 {
422         int depth = fb_get_color_depth(&info->var, &info->fix);
423         int yres;
424
425         memset(&fb_logo, 0, sizeof(struct logo_data));
426
427         if (info->flags & FBINFO_MISC_TILEBLITTING)
428                 return 0;
429
430         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
431                 depth = info->var.blue.length;
432                 if (info->var.red.length < depth)
433                         depth = info->var.red.length;
434                 if (info->var.green.length < depth)
435                         depth = info->var.green.length;
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                 return 0;
489
490         image.depth = 8;
491         image.data = fb_logo.logo->data;
492
493         if (fb_logo.needs_cmapreset)
494                 fb_set_logocmap(info, fb_logo.logo);
495
496         if (fb_logo.needs_truepalette || 
497             fb_logo.needs_directpalette) {
498                 palette = kmalloc(256 * 4, GFP_KERNEL);
499                 if (palette == NULL)
500                         return 0;
501
502                 if (fb_logo.needs_truepalette)
503                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
504                 else
505                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
506
507                 saved_pseudo_palette = info->pseudo_palette;
508                 info->pseudo_palette = palette;
509         }
510
511         if (fb_logo.depth <= 4) {
512                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height, 
513                                    GFP_KERNEL);
514                 if (logo_new == NULL) {
515                         kfree(palette);
516                         if (saved_pseudo_palette)
517                                 info->pseudo_palette = saved_pseudo_palette;
518                         return 0;
519                 }
520                 image.data = logo_new;
521                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
522         }
523
524         image.dx = 0;
525         image.dy = 0;
526         image.width = fb_logo.logo->width;
527         image.height = fb_logo.logo->height;
528
529         if (rotate) {
530                 logo_rotate = kmalloc(fb_logo.logo->width *
531                                       fb_logo.logo->height, GFP_KERNEL);
532                 if (logo_rotate)
533                         fb_rotate_logo(info, logo_rotate, &image, rotate);
534         }
535
536         fb_do_show_logo(info, &image, rotate);
537
538         kfree(palette);
539         if (saved_pseudo_palette != NULL)
540                 info->pseudo_palette = saved_pseudo_palette;
541         kfree(logo_new);
542         kfree(logo_rotate);
543         return fb_logo.logo->height;
544 }
545 #else
546 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
547 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
548 #endif /* CONFIG_LOGO */
549
550 static int fbmem_read_proc(char *buf, char **start, off_t offset,
551                            int len, int *eof, void *private)
552 {
553         struct fb_info **fi;
554         int clen;
555
556         clen = 0;
557         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
558                 if (*fi)
559                         clen += sprintf(buf + clen, "%d %s\n",
560                                         (*fi)->node,
561                                         (*fi)->fix.id);
562         *start = buf + offset;
563         if (clen > offset)
564                 clen -= offset;
565         else
566                 clen = 0;
567         return clen < len ? clen : len;
568 }
569
570 static ssize_t
571 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
572 {
573         unsigned long p = *ppos;
574         struct inode *inode = file->f_dentry->d_inode;
575         int fbidx = iminor(inode);
576         struct fb_info *info = registered_fb[fbidx];
577         u32 *buffer, *dst;
578         u32 __iomem *src;
579         int c, i, cnt = 0, err = 0;
580         unsigned long total_size;
581
582         if (!info || ! info->screen_base)
583                 return -ENODEV;
584
585         if (info->state != FBINFO_STATE_RUNNING)
586                 return -EPERM;
587
588         if (info->fbops->fb_read)
589                 return info->fbops->fb_read(file, buf, count, ppos);
590         
591         total_size = info->screen_size;
592
593         if (total_size == 0)
594                 total_size = info->fix.smem_len;
595
596         if (p >= total_size)
597                 return 0;
598
599         if (count >= total_size)
600                 count = total_size;
601
602         if (count + p > total_size)
603                 count = total_size - p;
604
605         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
606                          GFP_KERNEL);
607         if (!buffer)
608                 return -ENOMEM;
609
610         src = (u32 __iomem *) (info->screen_base + p);
611
612         if (info->fbops->fb_sync)
613                 info->fbops->fb_sync(info);
614
615         while (count) {
616                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
617                 dst = buffer;
618                 for (i = c >> 2; i--; )
619                         *dst++ = fb_readl(src++);
620                 if (c & 3) {
621                         u8 *dst8 = (u8 *) dst;
622                         u8 __iomem *src8 = (u8 __iomem *) src;
623
624                         for (i = c & 3; i--;)
625                                 *dst8++ = fb_readb(src8++);
626
627                         src = (u32 __iomem *) src8;
628                 }
629
630                 if (copy_to_user(buf, buffer, c)) {
631                         err = -EFAULT;
632                         break;
633                 }
634                 *ppos += c;
635                 buf += c;
636                 cnt += c;
637                 count -= c;
638         }
639
640         kfree(buffer);
641
642         return (err) ? err : cnt;
643 }
644
645 static ssize_t
646 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
647 {
648         unsigned long p = *ppos;
649         struct inode *inode = file->f_dentry->d_inode;
650         int fbidx = iminor(inode);
651         struct fb_info *info = registered_fb[fbidx];
652         u32 *buffer, *src;
653         u32 __iomem *dst;
654         int c, i, cnt = 0, err = 0;
655         unsigned long total_size;
656
657         if (!info || !info->screen_base)
658                 return -ENODEV;
659
660         if (info->state != FBINFO_STATE_RUNNING)
661                 return -EPERM;
662
663         if (info->fbops->fb_write)
664                 return info->fbops->fb_write(file, buf, count, ppos);
665         
666         total_size = info->screen_size;
667
668         if (total_size == 0)
669                 total_size = info->fix.smem_len;
670
671         if (p > total_size)
672                 return 0;
673
674         if (count >= total_size)
675                 count = total_size;
676
677         if (count + p > total_size)
678                 count = total_size - p;
679
680         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
681                          GFP_KERNEL);
682         if (!buffer)
683                 return -ENOMEM;
684
685         dst = (u32 __iomem *) (info->screen_base + p);
686
687         if (info->fbops->fb_sync)
688                 info->fbops->fb_sync(info);
689
690         while (count) {
691                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
692                 src = buffer;
693
694                 if (copy_from_user(src, buf, c)) {
695                         err = -EFAULT;
696                         break;
697                 }
698
699                 for (i = c >> 2; i--; )
700                         fb_writel(*src++, dst++);
701
702                 if (c & 3) {
703                         u8 *src8 = (u8 *) src;
704                         u8 __iomem *dst8 = (u8 __iomem *) dst;
705
706                         for (i = c & 3; i--; )
707                                 fb_writeb(*src8++, dst8++);
708
709                         dst = (u32 __iomem *) dst8;
710                 }
711
712                 *ppos += c;
713                 buf += c;
714                 cnt += c;
715                 count -= c;
716         }
717
718         kfree(buffer);
719
720         return (err) ? err : cnt;
721 }
722
723 #ifdef CONFIG_KMOD
724 static void try_to_load(int fb)
725 {
726         request_module("fb%d", fb);
727 }
728 #endif /* CONFIG_KMOD */
729
730 int
731 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
732 {
733         struct fb_fix_screeninfo *fix = &info->fix;
734         int xoffset = var->xoffset;
735         int yoffset = var->yoffset;
736         int err = 0, yres = info->var.yres;
737
738         if (var->yoffset > 0) {
739                 if (var->vmode & FB_VMODE_YWRAP) {
740                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
741                                 err = -EINVAL;
742                         else
743                                 yres = 0;
744                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
745                         err = -EINVAL;
746         }
747
748         if (var->xoffset > 0 && (!fix->xpanstep ||
749                                  (var->xoffset % fix->xpanstep)))
750                 err = -EINVAL;
751
752         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
753             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
754             var->xoffset + info->var.xres > info->var.xres_virtual)
755                 return -EINVAL;
756
757         if ((err = info->fbops->fb_pan_display(var, info)))
758                 return err;
759         info->var.xoffset = var->xoffset;
760         info->var.yoffset = var->yoffset;
761         if (var->vmode & FB_VMODE_YWRAP)
762                 info->var.vmode |= FB_VMODE_YWRAP;
763         else
764                 info->var.vmode &= ~FB_VMODE_YWRAP;
765         return 0;
766 }
767
768 int
769 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
770 {
771         int err, flags = info->flags;
772
773         if (var->activate & FB_ACTIVATE_INV_MODE) {
774                 struct fb_videomode mode1, mode2;
775                 int ret = 0;
776
777                 fb_var_to_videomode(&mode1, var);
778                 fb_var_to_videomode(&mode2, &info->var);
779                 /* make sure we don't delete the videomode of current var */
780                 ret = fb_mode_is_equal(&mode1, &mode2);
781
782                 if (!ret) {
783                     struct fb_event event;
784
785                     event.info = info;
786                     event.data = &mode1;
787                     ret = notifier_call_chain(&fb_notifier_list,
788                                               FB_EVENT_MODE_DELETE, &event);
789                 }
790
791                 if (!ret)
792                     fb_delete_videomode(&mode1, &info->modelist);
793
794                 return ret;
795         }
796
797         if ((var->activate & FB_ACTIVATE_FORCE) ||
798             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
799                 if (!info->fbops->fb_check_var) {
800                         *var = info->var;
801                         return 0;
802                 }
803
804                 if ((err = info->fbops->fb_check_var(var, info)))
805                         return err;
806
807                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
808                         struct fb_videomode mode;
809                         int err = 0;
810
811                         info->var = *var;
812                         if (info->fbops->fb_set_par)
813                                 info->fbops->fb_set_par(info);
814
815                         fb_pan_display(info, &info->var);
816
817                         fb_set_cmap(&info->cmap, info);
818
819                         fb_var_to_videomode(&mode, &info->var);
820
821                         if (info->modelist.prev && info->modelist.next &&
822                             !list_empty(&info->modelist))
823                                 err = fb_add_videomode(&mode, &info->modelist);
824
825                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
826                                 struct fb_event event;
827                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
828                                         FB_EVENT_MODE_CHANGE_ALL :
829                                         FB_EVENT_MODE_CHANGE;
830
831                                 info->flags &= ~FBINFO_MISC_USEREVENT;
832                                 event.info = info;
833                                 notifier_call_chain(&fb_notifier_list, evnt,
834                                                     &event);
835                         }
836                 }
837         }
838         return 0;
839 }
840
841 int
842 fb_blank(struct fb_info *info, int blank)
843 {       
844         int ret = -EINVAL;
845
846         if (blank > FB_BLANK_POWERDOWN)
847                 blank = FB_BLANK_POWERDOWN;
848
849         if (info->fbops->fb_blank)
850                 ret = info->fbops->fb_blank(blank, info);
851
852         if (!ret) {
853                 struct fb_event event;
854
855                 event.info = info;
856                 event.data = &blank;
857                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
858         }
859
860         return ret;
861 }
862
863 static int 
864 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
865          unsigned long arg)
866 {
867         int fbidx = iminor(inode);
868         struct fb_info *info = registered_fb[fbidx];
869         struct fb_ops *fb = info->fbops;
870         struct fb_var_screeninfo var;
871         struct fb_fix_screeninfo fix;
872         struct fb_con2fbmap con2fb;
873         struct fb_cmap_user cmap;
874         struct fb_event event;
875         void __user *argp = (void __user *)arg;
876         int i;
877         
878         if (!fb)
879                 return -ENODEV;
880         switch (cmd) {
881         case FBIOGET_VSCREENINFO:
882                 return copy_to_user(argp, &info->var,
883                                     sizeof(var)) ? -EFAULT : 0;
884         case FBIOPUT_VSCREENINFO:
885                 if (copy_from_user(&var, argp, sizeof(var)))
886                         return -EFAULT;
887                 acquire_console_sem();
888                 info->flags |= FBINFO_MISC_USEREVENT;
889                 i = fb_set_var(info, &var);
890                 info->flags &= ~FBINFO_MISC_USEREVENT;
891                 release_console_sem();
892                 if (i) return i;
893                 if (copy_to_user(argp, &var, sizeof(var)))
894                         return -EFAULT;
895                 return 0;
896         case FBIOGET_FSCREENINFO:
897                 return copy_to_user(argp, &info->fix,
898                                     sizeof(fix)) ? -EFAULT : 0;
899         case FBIOPUTCMAP:
900                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
901                         return -EFAULT;
902                 return (fb_set_user_cmap(&cmap, info));
903         case FBIOGETCMAP:
904                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
905                         return -EFAULT;
906                 return fb_cmap_to_user(&info->cmap, &cmap);
907         case FBIOPAN_DISPLAY:
908                 if (copy_from_user(&var, argp, sizeof(var)))
909                         return -EFAULT;
910                 acquire_console_sem();
911                 i = fb_pan_display(info, &var);
912                 release_console_sem();
913                 if (i)
914                         return i;
915                 if (copy_to_user(argp, &var, sizeof(var)))
916                         return -EFAULT;
917                 return 0;
918         case FBIO_CURSOR:
919                 return -EINVAL;
920         case FBIOGET_CON2FBMAP:
921                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
922                         return -EFAULT;
923                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
924                     return -EINVAL;
925                 con2fb.framebuffer = -1;
926                 event.info = info;
927                 event.data = &con2fb;
928                 notifier_call_chain(&fb_notifier_list,
929                                     FB_EVENT_GET_CONSOLE_MAP, &event);
930                 return copy_to_user(argp, &con2fb,
931                                     sizeof(con2fb)) ? -EFAULT : 0;
932         case FBIOPUT_CON2FBMAP:
933                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
934                         return - EFAULT;
935                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
936                     return -EINVAL;
937                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
938                     return -EINVAL;
939 #ifdef CONFIG_KMOD
940                 if (!registered_fb[con2fb.framebuffer])
941                     try_to_load(con2fb.framebuffer);
942 #endif /* CONFIG_KMOD */
943                 if (!registered_fb[con2fb.framebuffer])
944                     return -EINVAL;
945                 event.info = info;
946                 event.data = &con2fb;
947                 return notifier_call_chain(&fb_notifier_list,
948                                            FB_EVENT_SET_CONSOLE_MAP,
949                                            &event);
950         case FBIOBLANK:
951                 acquire_console_sem();
952                 info->flags |= FBINFO_MISC_USEREVENT;
953                 i = fb_blank(info, arg);
954                 info->flags &= ~FBINFO_MISC_USEREVENT;
955                 release_console_sem();
956                 return i;
957         default:
958                 if (fb->fb_ioctl == NULL)
959                         return -EINVAL;
960                 return fb->fb_ioctl(info, cmd, arg);
961         }
962 }
963
964 #ifdef CONFIG_COMPAT
965 struct fb_fix_screeninfo32 {
966         char                    id[16];
967         compat_caddr_t          smem_start;
968         u32                     smem_len;
969         u32                     type;
970         u32                     type_aux;
971         u32                     visual;
972         u16                     xpanstep;
973         u16                     ypanstep;
974         u16                     ywrapstep;
975         u32                     line_length;
976         compat_caddr_t          mmio_start;
977         u32                     mmio_len;
978         u32                     accel;
979         u16                     reserved[3];
980 };
981
982 struct fb_cmap32 {
983         u32                     start;
984         u32                     len;
985         compat_caddr_t  red;
986         compat_caddr_t  green;
987         compat_caddr_t  blue;
988         compat_caddr_t  transp;
989 };
990
991 static int fb_getput_cmap(struct inode *inode, struct file *file,
992                         unsigned int cmd, unsigned long arg)
993 {
994         struct fb_cmap_user __user *cmap;
995         struct fb_cmap32 __user *cmap32;
996         __u32 data;
997         int err;
998
999         cmap = compat_alloc_user_space(sizeof(*cmap));
1000         cmap32 = compat_ptr(arg);
1001
1002         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1003                 return -EFAULT;
1004
1005         if (get_user(data, &cmap32->red) ||
1006             put_user(compat_ptr(data), &cmap->red) ||
1007             get_user(data, &cmap32->green) ||
1008             put_user(compat_ptr(data), &cmap->green) ||
1009             get_user(data, &cmap32->blue) ||
1010             put_user(compat_ptr(data), &cmap->blue) ||
1011             get_user(data, &cmap32->transp) ||
1012             put_user(compat_ptr(data), &cmap->transp))
1013                 return -EFAULT;
1014
1015         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1016
1017         if (!err) {
1018                 if (copy_in_user(&cmap32->start,
1019                                  &cmap->start,
1020                                  2 * sizeof(__u32)))
1021                         err = -EFAULT;
1022         }
1023         return err;
1024 }
1025
1026 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1027                                   struct fb_fix_screeninfo32 __user *fix32)
1028 {
1029         __u32 data;
1030         int err;
1031
1032         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1033
1034         data = (__u32) (unsigned long) fix->smem_start;
1035         err |= put_user(data, &fix32->smem_start);
1036
1037         err |= put_user(fix->smem_len, &fix32->smem_len);
1038         err |= put_user(fix->type, &fix32->type);
1039         err |= put_user(fix->type_aux, &fix32->type_aux);
1040         err |= put_user(fix->visual, &fix32->visual);
1041         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1042         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1043         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1044         err |= put_user(fix->line_length, &fix32->line_length);
1045
1046         data = (__u32) (unsigned long) fix->mmio_start;
1047         err |= put_user(data, &fix32->mmio_start);
1048
1049         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1050         err |= put_user(fix->accel, &fix32->accel);
1051         err |= copy_to_user(fix32->reserved, fix->reserved,
1052                             sizeof(fix->reserved));
1053
1054         return err;
1055 }
1056
1057 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1058                                 unsigned int cmd, unsigned long arg)
1059 {
1060         mm_segment_t old_fs;
1061         struct fb_fix_screeninfo fix;
1062         struct fb_fix_screeninfo32 __user *fix32;
1063         int err;
1064
1065         fix32 = compat_ptr(arg);
1066
1067         old_fs = get_fs();
1068         set_fs(KERNEL_DS);
1069         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1070         set_fs(old_fs);
1071
1072         if (!err)
1073                 err = do_fscreeninfo_to_user(&fix, fix32);
1074
1075         return err;
1076 }
1077
1078 static long
1079 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1080 {
1081         struct inode *inode = file->f_dentry->d_inode;
1082         int fbidx = iminor(inode);
1083         struct fb_info *info = registered_fb[fbidx];
1084         struct fb_ops *fb = info->fbops;
1085         long ret = -ENOIOCTLCMD;
1086
1087         lock_kernel();
1088         switch(cmd) {
1089         case FBIOGET_VSCREENINFO:
1090         case FBIOPUT_VSCREENINFO:
1091         case FBIOPAN_DISPLAY:
1092         case FBIOGET_CON2FBMAP:
1093         case FBIOPUT_CON2FBMAP:
1094                 arg = (unsigned long) compat_ptr(arg);
1095         case FBIOBLANK:
1096                 ret = fb_ioctl(inode, file, cmd, arg);
1097                 break;
1098
1099         case FBIOGET_FSCREENINFO:
1100                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1101                 break;
1102
1103         case FBIOGETCMAP:
1104         case FBIOPUTCMAP:
1105                 ret = fb_getput_cmap(inode, file, cmd, arg);
1106                 break;
1107
1108         default:
1109                 if (fb->fb_compat_ioctl)
1110                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1111                 break;
1112         }
1113         unlock_kernel();
1114         return ret;
1115 }
1116 #endif
1117
1118 static int 
1119 fb_mmap(struct file *file, struct vm_area_struct * vma)
1120 {
1121         int fbidx = iminor(file->f_dentry->d_inode);
1122         struct fb_info *info = registered_fb[fbidx];
1123         struct fb_ops *fb = info->fbops;
1124         unsigned long off;
1125 #if !defined(__sparc__) || defined(__sparc_v9__)
1126         unsigned long start;
1127         u32 len;
1128 #endif
1129
1130         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1131                 return -EINVAL;
1132         off = vma->vm_pgoff << PAGE_SHIFT;
1133         if (!fb)
1134                 return -ENODEV;
1135         if (fb->fb_mmap) {
1136                 int res;
1137                 lock_kernel();
1138                 res = fb->fb_mmap(info, vma);
1139                 unlock_kernel();
1140                 return res;
1141         }
1142
1143 #if defined(__sparc__) && !defined(__sparc_v9__)
1144         /* Should never get here, all fb drivers should have their own
1145            mmap routines */
1146         return -EINVAL;
1147 #else
1148         /* !sparc32... */
1149         lock_kernel();
1150
1151         /* frame buffer memory */
1152         start = info->fix.smem_start;
1153         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1154         if (off >= len) {
1155                 /* memory mapped io */
1156                 off -= len;
1157                 if (info->var.accel_flags) {
1158                         unlock_kernel();
1159                         return -EINVAL;
1160                 }
1161                 start = info->fix.mmio_start;
1162                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1163         }
1164         unlock_kernel();
1165         start &= PAGE_MASK;
1166         if ((vma->vm_end - vma->vm_start + off) > len)
1167                 return -EINVAL;
1168         off += start;
1169         vma->vm_pgoff = off >> PAGE_SHIFT;
1170         /* This is an IO map - tell maydump to skip this VMA */
1171         vma->vm_flags |= VM_IO | VM_RESERVED;
1172 #if defined(__mc68000__)
1173 #if defined(CONFIG_SUN3)
1174         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1175 #elif defined(CONFIG_MMU)
1176         if (CPU_IS_020_OR_030)
1177                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1178         if (CPU_IS_040_OR_060) {
1179                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1180                 /* Use no-cache mode, serialized */
1181                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1182         }
1183 #endif
1184 #elif defined(__powerpc__)
1185         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1186                                                  vma->vm_end - vma->vm_start,
1187                                                  vma->vm_page_prot);
1188 #elif defined(__alpha__)
1189         /* Caching is off in the I/O space quadrant by design.  */
1190 #elif defined(__i386__) || defined(__x86_64__)
1191         if (boot_cpu_data.x86 > 3)
1192                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1193 #elif defined(__mips__) || defined(__sparc_v9__)
1194         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1195 #elif defined(__hppa__)
1196         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1197 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1198         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1199 #elif defined(__ia64__)
1200         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1201                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1202         else
1203                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1204 #else
1205 #warning What do we have to do here??
1206 #endif
1207         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1208                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1209                 return -EAGAIN;
1210         return 0;
1211 #endif /* !sparc32 */
1212 }
1213
1214 static int
1215 fb_open(struct inode *inode, struct file *file)
1216 {
1217         int fbidx = iminor(inode);
1218         struct fb_info *info;
1219         int res = 0;
1220
1221         if (fbidx >= FB_MAX)
1222                 return -ENODEV;
1223 #ifdef CONFIG_KMOD
1224         if (!(info = registered_fb[fbidx]))
1225                 try_to_load(fbidx);
1226 #endif /* CONFIG_KMOD */
1227         if (!(info = registered_fb[fbidx]))
1228                 return -ENODEV;
1229         if (!try_module_get(info->fbops->owner))
1230                 return -ENODEV;
1231         file->private_data = info;
1232         if (info->fbops->fb_open) {
1233                 res = info->fbops->fb_open(info,1);
1234                 if (res)
1235                         module_put(info->fbops->owner);
1236         }
1237         return res;
1238 }
1239
1240 static int 
1241 fb_release(struct inode *inode, struct file *file)
1242 {
1243         struct fb_info * const info = file->private_data;
1244
1245         lock_kernel();
1246         if (info->fbops->fb_release)
1247                 info->fbops->fb_release(info,1);
1248         module_put(info->fbops->owner);
1249         unlock_kernel();
1250         return 0;
1251 }
1252
1253 static struct file_operations fb_fops = {
1254         .owner =        THIS_MODULE,
1255         .read =         fb_read,
1256         .write =        fb_write,
1257         .ioctl =        fb_ioctl,
1258 #ifdef CONFIG_COMPAT
1259         .compat_ioctl = fb_compat_ioctl,
1260 #endif
1261         .mmap =         fb_mmap,
1262         .open =         fb_open,
1263         .release =      fb_release,
1264 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1265         .get_unmapped_area = get_fb_unmapped_area,
1266 #endif
1267 };
1268
1269 static struct class *fb_class;
1270
1271 /**
1272  *      register_framebuffer - registers a frame buffer device
1273  *      @fb_info: frame buffer info structure
1274  *
1275  *      Registers a frame buffer device @fb_info.
1276  *
1277  *      Returns negative errno on error, or zero for success.
1278  *
1279  */
1280
1281 int
1282 register_framebuffer(struct fb_info *fb_info)
1283 {
1284         int i;
1285         struct fb_event event;
1286         struct fb_videomode mode;
1287
1288         if (num_registered_fb == FB_MAX)
1289                 return -ENXIO;
1290         num_registered_fb++;
1291         for (i = 0 ; i < FB_MAX; i++)
1292                 if (!registered_fb[i])
1293                         break;
1294         fb_info->node = i;
1295
1296         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1297                                     fb_info->device, "fb%d", i);
1298         if (IS_ERR(fb_info->class_device)) {
1299                 /* Not fatal */
1300                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1301                 fb_info->class_device = NULL;
1302         } else
1303                 fb_init_class_device(fb_info);
1304
1305         if (fb_info->pixmap.addr == NULL) {
1306                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1307                 if (fb_info->pixmap.addr) {
1308                         fb_info->pixmap.size = FBPIXMAPSIZE;
1309                         fb_info->pixmap.buf_align = 1;
1310                         fb_info->pixmap.scan_align = 1;
1311                         fb_info->pixmap.access_align = 32;
1312                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1313                 }
1314         }       
1315         fb_info->pixmap.offset = 0;
1316
1317         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1318                 INIT_LIST_HEAD(&fb_info->modelist);
1319
1320         fb_var_to_videomode(&mode, &fb_info->var);
1321         fb_add_videomode(&mode, &fb_info->modelist);
1322         registered_fb[i] = fb_info;
1323
1324         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1325                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1326         event.info = fb_info;
1327         notifier_call_chain(&fb_notifier_list,
1328                             FB_EVENT_FB_REGISTERED, &event);
1329         return 0;
1330 }
1331
1332
1333 /**
1334  *      unregister_framebuffer - releases a frame buffer device
1335  *      @fb_info: frame buffer info structure
1336  *
1337  *      Unregisters a frame buffer device @fb_info.
1338  *
1339  *      Returns negative errno on error, or zero for success.
1340  *
1341  */
1342
1343 int
1344 unregister_framebuffer(struct fb_info *fb_info)
1345 {
1346         int i;
1347
1348         i = fb_info->node;
1349         if (!registered_fb[i])
1350                 return -EINVAL;
1351         devfs_remove("fb/%d", i);
1352
1353         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1354                 kfree(fb_info->pixmap.addr);
1355         fb_destroy_modelist(&fb_info->modelist);
1356         registered_fb[i]=NULL;
1357         num_registered_fb--;
1358         fb_cleanup_class_device(fb_info);
1359         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1360         return 0;
1361 }
1362
1363 /**
1364  *      fb_register_client - register a client notifier
1365  *      @nb: notifier block to callback on events
1366  */
1367 int fb_register_client(struct notifier_block *nb)
1368 {
1369         return notifier_chain_register(&fb_notifier_list, nb);
1370 }
1371
1372 /**
1373  *      fb_unregister_client - unregister a client notifier
1374  *      @nb: notifier block to callback on events
1375  */
1376 int fb_unregister_client(struct notifier_block *nb)
1377 {
1378         return notifier_chain_unregister(&fb_notifier_list, nb);
1379 }
1380
1381 /**
1382  *      fb_set_suspend - low level driver signals suspend
1383  *      @info: framebuffer affected
1384  *      @state: 0 = resuming, !=0 = suspending
1385  *
1386  *      This is meant to be used by low level drivers to
1387  *      signal suspend/resume to the core & clients.
1388  *      It must be called with the console semaphore held
1389  */
1390 void fb_set_suspend(struct fb_info *info, int state)
1391 {
1392         struct fb_event event;
1393
1394         event.info = info;
1395         if (state) {
1396                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1397                 info->state = FBINFO_STATE_SUSPENDED;
1398         } else {
1399                 info->state = FBINFO_STATE_RUNNING;
1400                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1401         }
1402 }
1403
1404 /**
1405  *      fbmem_init - init frame buffer subsystem
1406  *
1407  *      Initialize the frame buffer subsystem.
1408  *
1409  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1410  *
1411  */
1412
1413 static int __init
1414 fbmem_init(void)
1415 {
1416         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1417
1418         devfs_mk_dir("fb");
1419         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1420                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1421
1422         fb_class = class_create(THIS_MODULE, "graphics");
1423         if (IS_ERR(fb_class)) {
1424                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1425                 fb_class = NULL;
1426         }
1427         return 0;
1428 }
1429
1430 #ifdef MODULE
1431 module_init(fbmem_init);
1432 static void __exit
1433 fbmem_exit(void)
1434 {
1435         class_destroy(fb_class);
1436         unregister_chrdev(FB_MAJOR, "fb");
1437 }
1438
1439 module_exit(fbmem_exit);
1440 MODULE_LICENSE("GPL");
1441 MODULE_DESCRIPTION("Framebuffer base");
1442 #else
1443 subsys_initcall(fbmem_init);
1444 #endif
1445
1446 int fb_new_modelist(struct fb_info *info)
1447 {
1448         struct fb_event event;
1449         struct fb_var_screeninfo var = info->var;
1450         struct list_head *pos, *n;
1451         struct fb_modelist *modelist;
1452         struct fb_videomode *m, mode;
1453         int err = 1;
1454
1455         list_for_each_safe(pos, n, &info->modelist) {
1456                 modelist = list_entry(pos, struct fb_modelist, list);
1457                 m = &modelist->mode;
1458                 fb_videomode_to_var(&var, m);
1459                 var.activate = FB_ACTIVATE_TEST;
1460                 err = fb_set_var(info, &var);
1461                 fb_var_to_videomode(&mode, &var);
1462                 if (err || !fb_mode_is_equal(m, &mode)) {
1463                         list_del(pos);
1464                         kfree(pos);
1465                 }
1466         }
1467
1468         err = 1;
1469
1470         if (!list_empty(&info->modelist)) {
1471                 event.info = info;
1472                 err = notifier_call_chain(&fb_notifier_list,
1473                                            FB_EVENT_NEW_MODELIST,
1474                                            &event);
1475         }
1476
1477         return err;
1478 }
1479
1480 /**
1481  * fb_con_duit - user<->fbcon passthrough
1482  * @info: struct fb_info
1483  * @event: notification event to be passed to fbcon
1484  * @data: private data
1485  *
1486  * DESCRIPTION
1487  * This function is an fbcon-user event passing channel
1488  * which bypasses fbdev.  This is hopefully temporary
1489  * until a user interface for fbcon is created
1490  */
1491 int fb_con_duit(struct fb_info *info, int event, void *data)
1492 {
1493         struct fb_event evnt;
1494
1495         evnt.info = info;
1496         evnt.data = data;
1497
1498         return notifier_call_chain(&fb_notifier_list, event, &evnt);
1499 }
1500 EXPORT_SYMBOL(fb_con_duit);
1501
1502 static char *video_options[FB_MAX];
1503 static int ofonly;
1504
1505 extern const char *global_mode_option;
1506
1507 /**
1508  * fb_get_options - get kernel boot parameters
1509  * @name:   framebuffer name as it would appear in
1510  *          the boot parameter line
1511  *          (video=<name>:<options>)
1512  * @option: the option will be stored here
1513  *
1514  * NOTE: Needed to maintain backwards compatibility
1515  */
1516 int fb_get_options(char *name, char **option)
1517 {
1518         char *opt, *options = NULL;
1519         int opt_len, retval = 0;
1520         int name_len = strlen(name), i;
1521
1522         if (name_len && ofonly && strncmp(name, "offb", 4))
1523                 retval = 1;
1524
1525         if (name_len && !retval) {
1526                 for (i = 0; i < FB_MAX; i++) {
1527                         if (video_options[i] == NULL)
1528                                 continue;
1529                         opt_len = strlen(video_options[i]);
1530                         if (!opt_len)
1531                                 continue;
1532                         opt = video_options[i];
1533                         if (!strncmp(name, opt, name_len) &&
1534                             opt[name_len] == ':')
1535                                 options = opt + name_len + 1;
1536                 }
1537         }
1538         if (options && !strncmp(options, "off", 3))
1539                 retval = 1;
1540
1541         if (option)
1542                 *option = options;
1543
1544         return retval;
1545 }
1546
1547 #ifndef MODULE
1548 /**
1549  *      video_setup - process command line options
1550  *      @options: string of options
1551  *
1552  *      Process command line options for frame buffer subsystem.
1553  *
1554  *      NOTE: This function is a __setup and __init function.
1555  *            It only stores the options.  Drivers have to call
1556  *            fb_get_options() as necessary.
1557  *
1558  *      Returns zero.
1559  *
1560  */
1561 static int __init video_setup(char *options)
1562 {
1563         int i, global = 0;
1564
1565         if (!options || !*options)
1566                 global = 1;
1567
1568         if (!global && !strncmp(options, "ofonly", 6)) {
1569                 ofonly = 1;
1570                 global = 1;
1571         }
1572
1573         if (!global && !strstr(options, "fb:")) {
1574                 global_mode_option = options;
1575                 global = 1;
1576         }
1577
1578         if (!global) {
1579                 for (i = 0; i < FB_MAX; i++) {
1580                         if (video_options[i] == NULL) {
1581                                 video_options[i] = options;
1582                                 break;
1583                         }
1584
1585                 }
1586         }
1587
1588         return 0;
1589 }
1590 __setup("video=", video_setup);
1591 #endif
1592
1593     /*
1594      *  Visible symbols for modules
1595      */
1596
1597 EXPORT_SYMBOL(register_framebuffer);
1598 EXPORT_SYMBOL(unregister_framebuffer);
1599 EXPORT_SYMBOL(num_registered_fb);
1600 EXPORT_SYMBOL(registered_fb);
1601 EXPORT_SYMBOL(fb_prepare_logo);
1602 EXPORT_SYMBOL(fb_show_logo);
1603 EXPORT_SYMBOL(fb_set_var);
1604 EXPORT_SYMBOL(fb_blank);
1605 EXPORT_SYMBOL(fb_pan_display);
1606 EXPORT_SYMBOL(fb_get_buffer_offset);
1607 EXPORT_SYMBOL(fb_set_suspend);
1608 EXPORT_SYMBOL(fb_register_client);
1609 EXPORT_SYMBOL(fb_unregister_client);
1610 EXPORT_SYMBOL(fb_get_options);
1611 EXPORT_SYMBOL(fb_new_modelist);
1612
1613 MODULE_LICENSE("GPL");