d412a1ddc12fabb50df8562af40b5df25351d2bd
[sfrench/cifs-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/seq_file.h>
30 #include <linux/console.h>
31 #include <linux/kmod.h>
32 #include <linux/err.h>
33 #include <linux/device.h>
34 #include <linux/efi.h>
35 #include <linux/fb.h>
36
37 #include <asm/fb.h>
38
39
40     /*
41      *  Frame buffer device initialization and setup routines
42      */
43
44 #define FBPIXMAPSIZE    (1024 * 8)
45
46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
47 int num_registered_fb __read_mostly;
48
49 int lock_fb_info(struct fb_info *info)
50 {
51         mutex_lock(&info->lock);
52         if (!info->fbops) {
53                 mutex_unlock(&info->lock);
54                 return 0;
55         }
56         return 1;
57 }
58 EXPORT_SYMBOL(lock_fb_info);
59
60 /*
61  * Helpers
62  */
63
64 int fb_get_color_depth(struct fb_var_screeninfo *var,
65                        struct fb_fix_screeninfo *fix)
66 {
67         int depth = 0;
68
69         if (fix->visual == FB_VISUAL_MONO01 ||
70             fix->visual == FB_VISUAL_MONO10)
71                 depth = 1;
72         else {
73                 if (var->green.length == var->blue.length &&
74                     var->green.length == var->red.length &&
75                     var->green.offset == var->blue.offset &&
76                     var->green.offset == var->red.offset)
77                         depth = var->green.length;
78                 else
79                         depth = var->green.length + var->red.length +
80                                 var->blue.length;
81         }
82
83         return depth;
84 }
85 EXPORT_SYMBOL(fb_get_color_depth);
86
87 /*
88  * Data padding functions.
89  */
90 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
91 {
92         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
93 }
94 EXPORT_SYMBOL(fb_pad_aligned_buffer);
95
96 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
97                                 u32 shift_high, u32 shift_low, u32 mod)
98 {
99         u8 mask = (u8) (0xfff << shift_high), tmp;
100         int i, j;
101
102         for (i = height; i--; ) {
103                 for (j = 0; j < idx; j++) {
104                         tmp = dst[j];
105                         tmp &= mask;
106                         tmp |= *src >> shift_low;
107                         dst[j] = tmp;
108                         tmp = *src << shift_high;
109                         dst[j+1] = tmp;
110                         src++;
111                 }
112                 tmp = dst[idx];
113                 tmp &= mask;
114                 tmp |= *src >> shift_low;
115                 dst[idx] = tmp;
116                 if (shift_high < mod) {
117                         tmp = *src << shift_high;
118                         dst[idx+1] = tmp;
119                 }
120                 src++;
121                 dst += d_pitch;
122         }
123 }
124 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
125
126 /*
127  * we need to lock this section since fb_cursor
128  * may use fb_imageblit()
129  */
130 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
131 {
132         u32 align = buf->buf_align - 1, offset;
133         char *addr = buf->addr;
134
135         /* If IO mapped, we need to sync before access, no sharing of
136          * the pixmap is done
137          */
138         if (buf->flags & FB_PIXMAP_IO) {
139                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
140                         info->fbops->fb_sync(info);
141                 return addr;
142         }
143
144         /* See if we fit in the remaining pixmap space */
145         offset = buf->offset + align;
146         offset &= ~align;
147         if (offset + size > buf->size) {
148                 /* We do not fit. In order to be able to re-use the buffer,
149                  * we must ensure no asynchronous DMA'ing or whatever operation
150                  * is in progress, we sync for that.
151                  */
152                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
153                         info->fbops->fb_sync(info);
154                 offset = 0;
155         }
156         buf->offset = offset + size;
157         addr += offset;
158
159         return addr;
160 }
161
162 #ifdef CONFIG_LOGO
163
164 static inline unsigned safe_shift(unsigned d, int n)
165 {
166         return n < 0 ? d >> -n : d << n;
167 }
168
169 static void fb_set_logocmap(struct fb_info *info,
170                                    const struct linux_logo *logo)
171 {
172         struct fb_cmap palette_cmap;
173         u16 palette_green[16];
174         u16 palette_blue[16];
175         u16 palette_red[16];
176         int i, j, n;
177         const unsigned char *clut = logo->clut;
178
179         palette_cmap.start = 0;
180         palette_cmap.len = 16;
181         palette_cmap.red = palette_red;
182         palette_cmap.green = palette_green;
183         palette_cmap.blue = palette_blue;
184         palette_cmap.transp = NULL;
185
186         for (i = 0; i < logo->clutsize; i += n) {
187                 n = logo->clutsize - i;
188                 /* palette_cmap provides space for only 16 colors at once */
189                 if (n > 16)
190                         n = 16;
191                 palette_cmap.start = 32 + i;
192                 palette_cmap.len = n;
193                 for (j = 0; j < n; ++j) {
194                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
195                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
196                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
197                         clut += 3;
198                 }
199                 fb_set_cmap(&palette_cmap, info);
200         }
201 }
202
203 static void  fb_set_logo_truepalette(struct fb_info *info,
204                                             const struct linux_logo *logo,
205                                             u32 *palette)
206 {
207         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
208         unsigned char redmask, greenmask, bluemask;
209         int redshift, greenshift, blueshift;
210         int i;
211         const unsigned char *clut = logo->clut;
212
213         /*
214          * We have to create a temporary palette since console palette is only
215          * 16 colors long.
216          */
217         /* Bug: Doesn't obey msb_right ... (who needs that?) */
218         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
219         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
220         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
221         redshift   = info->var.red.offset   - (8 - info->var.red.length);
222         greenshift = info->var.green.offset - (8 - info->var.green.length);
223         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
224
225         for ( i = 0; i < logo->clutsize; i++) {
226                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
227                                  safe_shift((clut[1] & greenmask), greenshift) |
228                                  safe_shift((clut[2] & bluemask), blueshift));
229                 clut += 3;
230         }
231 }
232
233 static void fb_set_logo_directpalette(struct fb_info *info,
234                                              const struct linux_logo *logo,
235                                              u32 *palette)
236 {
237         int redshift, greenshift, blueshift;
238         int i;
239
240         redshift = info->var.red.offset;
241         greenshift = info->var.green.offset;
242         blueshift = info->var.blue.offset;
243
244         for (i = 32; i < 32 + logo->clutsize; i++)
245                 palette[i] = i << redshift | i << greenshift | i << blueshift;
246 }
247
248 static void fb_set_logo(struct fb_info *info,
249                                const struct linux_logo *logo, u8 *dst,
250                                int depth)
251 {
252         int i, j, k;
253         const u8 *src = logo->data;
254         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
255         u8 fg = 1, d;
256
257         switch (fb_get_color_depth(&info->var, &info->fix)) {
258         case 1:
259                 fg = 1;
260                 break;
261         case 2:
262                 fg = 3;
263                 break;
264         default:
265                 fg = 7;
266                 break;
267         }
268
269         if (info->fix.visual == FB_VISUAL_MONO01 ||
270             info->fix.visual == FB_VISUAL_MONO10)
271                 fg = ~((u8) (0xfff << info->var.green.length));
272
273         switch (depth) {
274         case 4:
275                 for (i = 0; i < logo->height; i++)
276                         for (j = 0; j < logo->width; src++) {
277                                 *dst++ = *src >> 4;
278                                 j++;
279                                 if (j < logo->width) {
280                                         *dst++ = *src & 0x0f;
281                                         j++;
282                                 }
283                         }
284                 break;
285         case 1:
286                 for (i = 0; i < logo->height; i++) {
287                         for (j = 0; j < logo->width; src++) {
288                                 d = *src ^ xor;
289                                 for (k = 7; k >= 0; k--) {
290                                         *dst++ = ((d >> k) & 1) ? fg : 0;
291                                         j++;
292                                 }
293                         }
294                 }
295                 break;
296         }
297 }
298
299 /*
300  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
301  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
302  * the visual format and color depth of the framebuffer, the DAC, the
303  * pseudo_palette, and the logo data will be adjusted accordingly.
304  *
305  * Case 1 - linux_logo_clut224:
306  * Color exceeds the number of console colors (16), thus we set the hardware DAC
307  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
308  *
309  * For visuals that require color info from the pseudo_palette, we also construct
310  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
311  * will be set.
312  *
313  * Case 2 - linux_logo_vga16:
314  * The number of colors just matches the console colors, thus there is no need
315  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
316  * each byte contains color information for two pixels (upper and lower nibble).
317  * To be consistent with fb_imageblit() usage, we therefore separate the two
318  * nibbles into separate bytes. The "depth" flag will be set to 4.
319  *
320  * Case 3 - linux_logo_mono:
321  * This is similar with Case 2.  Each byte contains information for 8 pixels.
322  * We isolate each bit and expand each into a byte. The "depth" flag will
323  * be set to 1.
324  */
325 static struct logo_data {
326         int depth;
327         int needs_directpalette;
328         int needs_truepalette;
329         int needs_cmapreset;
330         const struct linux_logo *logo;
331 } fb_logo __read_mostly;
332
333 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
334 {
335         u32 size = width * height, i;
336
337         out += size - 1;
338
339         for (i = size; i--; )
340                 *out-- = *in++;
341 }
342
343 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
344 {
345         int i, j, h = height - 1;
346
347         for (i = 0; i < height; i++)
348                 for (j = 0; j < width; j++)
349                                 out[height * j + h - i] = *in++;
350 }
351
352 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
353 {
354         int i, j, w = width - 1;
355
356         for (i = 0; i < height; i++)
357                 for (j = 0; j < width; j++)
358                         out[height * (w - j) + i] = *in++;
359 }
360
361 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
362                            struct fb_image *image, int rotate)
363 {
364         u32 tmp;
365
366         if (rotate == FB_ROTATE_UD) {
367                 fb_rotate_logo_ud(image->data, dst, image->width,
368                                   image->height);
369                 image->dx = info->var.xres - image->width - image->dx;
370                 image->dy = info->var.yres - image->height - image->dy;
371         } else if (rotate == FB_ROTATE_CW) {
372                 fb_rotate_logo_cw(image->data, dst, image->width,
373                                   image->height);
374                 tmp = image->width;
375                 image->width = image->height;
376                 image->height = tmp;
377                 tmp = image->dy;
378                 image->dy = image->dx;
379                 image->dx = info->var.xres - image->width - tmp;
380         } else if (rotate == FB_ROTATE_CCW) {
381                 fb_rotate_logo_ccw(image->data, dst, image->width,
382                                    image->height);
383                 tmp = image->width;
384                 image->width = image->height;
385                 image->height = tmp;
386                 tmp = image->dx;
387                 image->dx = image->dy;
388                 image->dy = info->var.yres - image->height - tmp;
389         }
390
391         image->data = dst;
392 }
393
394 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
395                             int rotate, unsigned int num)
396 {
397         unsigned int x;
398
399         if (rotate == FB_ROTATE_UR) {
400                 for (x = 0;
401                      x < num && image->dx + image->width <= info->var.xres;
402                      x++) {
403                         info->fbops->fb_imageblit(info, image);
404                         image->dx += image->width + 8;
405                 }
406         } else if (rotate == FB_ROTATE_UD) {
407                 for (x = 0; x < num && image->dx >= 0; x++) {
408                         info->fbops->fb_imageblit(info, image);
409                         image->dx -= image->width + 8;
410                 }
411         } else if (rotate == FB_ROTATE_CW) {
412                 for (x = 0;
413                      x < num && image->dy + image->height <= info->var.yres;
414                      x++) {
415                         info->fbops->fb_imageblit(info, image);
416                         image->dy += image->height + 8;
417                 }
418         } else if (rotate == FB_ROTATE_CCW) {
419                 for (x = 0; x < num && image->dy >= 0; x++) {
420                         info->fbops->fb_imageblit(info, image);
421                         image->dy -= image->height + 8;
422                 }
423         }
424 }
425
426 static int fb_show_logo_line(struct fb_info *info, int rotate,
427                              const struct linux_logo *logo, int y,
428                              unsigned int n)
429 {
430         u32 *palette = NULL, *saved_pseudo_palette = NULL;
431         unsigned char *logo_new = NULL, *logo_rotate = NULL;
432         struct fb_image image;
433
434         /* Return if the frame buffer is not mapped or suspended */
435         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
436             info->flags & FBINFO_MODULE)
437                 return 0;
438
439         image.depth = 8;
440         image.data = logo->data;
441
442         if (fb_logo.needs_cmapreset)
443                 fb_set_logocmap(info, logo);
444
445         if (fb_logo.needs_truepalette ||
446             fb_logo.needs_directpalette) {
447                 palette = kmalloc(256 * 4, GFP_KERNEL);
448                 if (palette == NULL)
449                         return 0;
450
451                 if (fb_logo.needs_truepalette)
452                         fb_set_logo_truepalette(info, logo, palette);
453                 else
454                         fb_set_logo_directpalette(info, logo, palette);
455
456                 saved_pseudo_palette = info->pseudo_palette;
457                 info->pseudo_palette = palette;
458         }
459
460         if (fb_logo.depth <= 4) {
461                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
462                 if (logo_new == NULL) {
463                         kfree(palette);
464                         if (saved_pseudo_palette)
465                                 info->pseudo_palette = saved_pseudo_palette;
466                         return 0;
467                 }
468                 image.data = logo_new;
469                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
470         }
471
472         image.dx = 0;
473         image.dy = y;
474         image.width = logo->width;
475         image.height = logo->height;
476
477         if (rotate) {
478                 logo_rotate = kmalloc(logo->width *
479                                       logo->height, GFP_KERNEL);
480                 if (logo_rotate)
481                         fb_rotate_logo(info, logo_rotate, &image, rotate);
482         }
483
484         fb_do_show_logo(info, &image, rotate, n);
485
486         kfree(palette);
487         if (saved_pseudo_palette != NULL)
488                 info->pseudo_palette = saved_pseudo_palette;
489         kfree(logo_new);
490         kfree(logo_rotate);
491         return logo->height;
492 }
493
494
495 #ifdef CONFIG_FB_LOGO_EXTRA
496
497 #define FB_LOGO_EX_NUM_MAX 10
498 static struct logo_data_extra {
499         const struct linux_logo *logo;
500         unsigned int n;
501 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
502 static unsigned int fb_logo_ex_num;
503
504 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
505 {
506         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
507                 return;
508
509         fb_logo_ex[fb_logo_ex_num].logo = logo;
510         fb_logo_ex[fb_logo_ex_num].n = n;
511         fb_logo_ex_num++;
512 }
513
514 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
515                                   unsigned int yres)
516 {
517         unsigned int i;
518
519         /* FIXME: logo_ex supports only truecolor fb. */
520         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
521                 fb_logo_ex_num = 0;
522
523         for (i = 0; i < fb_logo_ex_num; i++) {
524                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
525                         fb_logo_ex[i].logo = NULL;
526                         continue;
527                 }
528                 height += fb_logo_ex[i].logo->height;
529                 if (height > yres) {
530                         height -= fb_logo_ex[i].logo->height;
531                         fb_logo_ex_num = i;
532                         break;
533                 }
534         }
535         return height;
536 }
537
538 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
539 {
540         unsigned int i;
541
542         for (i = 0; i < fb_logo_ex_num; i++)
543                 y += fb_show_logo_line(info, rotate,
544                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
545
546         return y;
547 }
548
549 #else /* !CONFIG_FB_LOGO_EXTRA */
550
551 static inline int fb_prepare_extra_logos(struct fb_info *info,
552                                          unsigned int height,
553                                          unsigned int yres)
554 {
555         return height;
556 }
557
558 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
559 {
560         return y;
561 }
562
563 #endif /* CONFIG_FB_LOGO_EXTRA */
564
565
566 int fb_prepare_logo(struct fb_info *info, int rotate)
567 {
568         int depth = fb_get_color_depth(&info->var, &info->fix);
569         unsigned int yres;
570
571         memset(&fb_logo, 0, sizeof(struct logo_data));
572
573         if (info->flags & FBINFO_MISC_TILEBLITTING ||
574             info->flags & FBINFO_MODULE)
575                 return 0;
576
577         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
578                 depth = info->var.blue.length;
579                 if (info->var.red.length < depth)
580                         depth = info->var.red.length;
581                 if (info->var.green.length < depth)
582                         depth = info->var.green.length;
583         }
584
585         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
586                 /* assume console colormap */
587                 depth = 4;
588         }
589
590         /* Return if no suitable logo was found */
591         fb_logo.logo = fb_find_logo(depth);
592
593         if (!fb_logo.logo) {
594                 return 0;
595         }
596
597         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
598                 yres = info->var.yres;
599         else
600                 yres = info->var.xres;
601
602         if (fb_logo.logo->height > yres) {
603                 fb_logo.logo = NULL;
604                 return 0;
605         }
606
607         /* What depth we asked for might be different from what we get */
608         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
609                 fb_logo.depth = 8;
610         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
611                 fb_logo.depth = 4;
612         else
613                 fb_logo.depth = 1;
614
615
616         if (fb_logo.depth > 4 && depth > 4) {
617                 switch (info->fix.visual) {
618                 case FB_VISUAL_TRUECOLOR:
619                         fb_logo.needs_truepalette = 1;
620                         break;
621                 case FB_VISUAL_DIRECTCOLOR:
622                         fb_logo.needs_directpalette = 1;
623                         fb_logo.needs_cmapreset = 1;
624                         break;
625                 case FB_VISUAL_PSEUDOCOLOR:
626                         fb_logo.needs_cmapreset = 1;
627                         break;
628                 }
629         }
630
631         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
632 }
633
634 int fb_show_logo(struct fb_info *info, int rotate)
635 {
636         int y;
637
638         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
639                               num_online_cpus());
640         y = fb_show_extra_logos(info, y, rotate);
641
642         return y;
643 }
644 #else
645 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
646 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
647 #endif /* CONFIG_LOGO */
648
649 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
650 {
651         return (*pos < FB_MAX) ? pos : NULL;
652 }
653
654 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
655 {
656         (*pos)++;
657         return (*pos < FB_MAX) ? pos : NULL;
658 }
659
660 static void fb_seq_stop(struct seq_file *m, void *v)
661 {
662 }
663
664 static int fb_seq_show(struct seq_file *m, void *v)
665 {
666         int i = *(loff_t *)v;
667         struct fb_info *fi = registered_fb[i];
668
669         if (fi)
670                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
671         return 0;
672 }
673
674 static const struct seq_operations proc_fb_seq_ops = {
675         .start  = fb_seq_start,
676         .next   = fb_seq_next,
677         .stop   = fb_seq_stop,
678         .show   = fb_seq_show,
679 };
680
681 static int proc_fb_open(struct inode *inode, struct file *file)
682 {
683         return seq_open(file, &proc_fb_seq_ops);
684 }
685
686 static const struct file_operations fb_proc_fops = {
687         .owner          = THIS_MODULE,
688         .open           = proc_fb_open,
689         .read           = seq_read,
690         .llseek         = seq_lseek,
691         .release        = seq_release,
692 };
693
694 static ssize_t
695 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
696 {
697         unsigned long p = *ppos;
698         struct inode *inode = file->f_path.dentry->d_inode;
699         int fbidx = iminor(inode);
700         struct fb_info *info = registered_fb[fbidx];
701         u32 *buffer, *dst;
702         u32 __iomem *src;
703         int c, i, cnt = 0, err = 0;
704         unsigned long total_size;
705
706         if (!info || ! info->screen_base)
707                 return -ENODEV;
708
709         if (info->state != FBINFO_STATE_RUNNING)
710                 return -EPERM;
711
712         if (info->fbops->fb_read)
713                 return info->fbops->fb_read(info, buf, count, ppos);
714         
715         total_size = info->screen_size;
716
717         if (total_size == 0)
718                 total_size = info->fix.smem_len;
719
720         if (p >= total_size)
721                 return 0;
722
723         if (count >= total_size)
724                 count = total_size;
725
726         if (count + p > total_size)
727                 count = total_size - p;
728
729         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
730                          GFP_KERNEL);
731         if (!buffer)
732                 return -ENOMEM;
733
734         src = (u32 __iomem *) (info->screen_base + p);
735
736         if (info->fbops->fb_sync)
737                 info->fbops->fb_sync(info);
738
739         while (count) {
740                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
741                 dst = buffer;
742                 for (i = c >> 2; i--; )
743                         *dst++ = fb_readl(src++);
744                 if (c & 3) {
745                         u8 *dst8 = (u8 *) dst;
746                         u8 __iomem *src8 = (u8 __iomem *) src;
747
748                         for (i = c & 3; i--;)
749                                 *dst8++ = fb_readb(src8++);
750
751                         src = (u32 __iomem *) src8;
752                 }
753
754                 if (copy_to_user(buf, buffer, c)) {
755                         err = -EFAULT;
756                         break;
757                 }
758                 *ppos += c;
759                 buf += c;
760                 cnt += c;
761                 count -= c;
762         }
763
764         kfree(buffer);
765
766         return (err) ? err : cnt;
767 }
768
769 static ssize_t
770 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
771 {
772         unsigned long p = *ppos;
773         struct inode *inode = file->f_path.dentry->d_inode;
774         int fbidx = iminor(inode);
775         struct fb_info *info = registered_fb[fbidx];
776         u32 *buffer, *src;
777         u32 __iomem *dst;
778         int c, i, cnt = 0, err = 0;
779         unsigned long total_size;
780
781         if (!info || !info->screen_base)
782                 return -ENODEV;
783
784         if (info->state != FBINFO_STATE_RUNNING)
785                 return -EPERM;
786
787         if (info->fbops->fb_write)
788                 return info->fbops->fb_write(info, buf, count, ppos);
789         
790         total_size = info->screen_size;
791
792         if (total_size == 0)
793                 total_size = info->fix.smem_len;
794
795         if (p > total_size)
796                 return -EFBIG;
797
798         if (count > total_size) {
799                 err = -EFBIG;
800                 count = total_size;
801         }
802
803         if (count + p > total_size) {
804                 if (!err)
805                         err = -ENOSPC;
806
807                 count = total_size - p;
808         }
809
810         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
811                          GFP_KERNEL);
812         if (!buffer)
813                 return -ENOMEM;
814
815         dst = (u32 __iomem *) (info->screen_base + p);
816
817         if (info->fbops->fb_sync)
818                 info->fbops->fb_sync(info);
819
820         while (count) {
821                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
822                 src = buffer;
823
824                 if (copy_from_user(src, buf, c)) {
825                         err = -EFAULT;
826                         break;
827                 }
828
829                 for (i = c >> 2; i--; )
830                         fb_writel(*src++, dst++);
831
832                 if (c & 3) {
833                         u8 *src8 = (u8 *) src;
834                         u8 __iomem *dst8 = (u8 __iomem *) dst;
835
836                         for (i = c & 3; i--; )
837                                 fb_writeb(*src8++, dst8++);
838
839                         dst = (u32 __iomem *) dst8;
840                 }
841
842                 *ppos += c;
843                 buf += c;
844                 cnt += c;
845                 count -= c;
846         }
847
848         kfree(buffer);
849
850         return (cnt) ? cnt : err;
851 }
852
853 int
854 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
855 {
856         struct fb_fix_screeninfo *fix = &info->fix;
857         unsigned int yres = info->var.yres;
858         int err = 0;
859
860         if (var->yoffset > 0) {
861                 if (var->vmode & FB_VMODE_YWRAP) {
862                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
863                                 err = -EINVAL;
864                         else
865                                 yres = 0;
866                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
867                         err = -EINVAL;
868         }
869
870         if (var->xoffset > 0 && (!fix->xpanstep ||
871                                  (var->xoffset % fix->xpanstep)))
872                 err = -EINVAL;
873
874         if (err || !info->fbops->fb_pan_display ||
875             var->yoffset + yres > info->var.yres_virtual ||
876             var->xoffset + info->var.xres > info->var.xres_virtual)
877                 return -EINVAL;
878
879         if ((err = info->fbops->fb_pan_display(var, info)))
880                 return err;
881         info->var.xoffset = var->xoffset;
882         info->var.yoffset = var->yoffset;
883         if (var->vmode & FB_VMODE_YWRAP)
884                 info->var.vmode |= FB_VMODE_YWRAP;
885         else
886                 info->var.vmode &= ~FB_VMODE_YWRAP;
887         return 0;
888 }
889
890 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
891                          u32 activate)
892 {
893         struct fb_event event;
894         struct fb_blit_caps caps, fbcaps;
895         int err = 0;
896
897         memset(&caps, 0, sizeof(caps));
898         memset(&fbcaps, 0, sizeof(fbcaps));
899         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
900         event.info = info;
901         event.data = &caps;
902         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
903         info->fbops->fb_get_caps(info, &fbcaps, var);
904
905         if (((fbcaps.x ^ caps.x) & caps.x) ||
906             ((fbcaps.y ^ caps.y) & caps.y) ||
907             (fbcaps.len < caps.len))
908                 err = -EINVAL;
909
910         return err;
911 }
912
913 int
914 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
915 {
916         int flags = info->flags;
917         int ret = 0;
918
919         if (var->activate & FB_ACTIVATE_INV_MODE) {
920                 struct fb_videomode mode1, mode2;
921
922                 fb_var_to_videomode(&mode1, var);
923                 fb_var_to_videomode(&mode2, &info->var);
924                 /* make sure we don't delete the videomode of current var */
925                 ret = fb_mode_is_equal(&mode1, &mode2);
926
927                 if (!ret) {
928                     struct fb_event event;
929
930                     event.info = info;
931                     event.data = &mode1;
932                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
933                 }
934
935                 if (!ret)
936                     fb_delete_videomode(&mode1, &info->modelist);
937
938
939                 ret = (ret) ? -EINVAL : 0;
940                 goto done;
941         }
942
943         if ((var->activate & FB_ACTIVATE_FORCE) ||
944             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
945                 u32 activate = var->activate;
946
947                 if (!info->fbops->fb_check_var) {
948                         *var = info->var;
949                         goto done;
950                 }
951
952                 ret = info->fbops->fb_check_var(var, info);
953
954                 if (ret)
955                         goto done;
956
957                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
958                         struct fb_videomode mode;
959
960                         if (info->fbops->fb_get_caps) {
961                                 ret = fb_check_caps(info, var, activate);
962
963                                 if (ret)
964                                         goto done;
965                         }
966
967                         info->var = *var;
968
969                         if (info->fbops->fb_set_par)
970                                 info->fbops->fb_set_par(info);
971
972                         fb_pan_display(info, &info->var);
973                         fb_set_cmap(&info->cmap, info);
974                         fb_var_to_videomode(&mode, &info->var);
975
976                         if (info->modelist.prev && info->modelist.next &&
977                             !list_empty(&info->modelist))
978                                 ret = fb_add_videomode(&mode, &info->modelist);
979
980                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
981                                 struct fb_event event;
982                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
983                                         FB_EVENT_MODE_CHANGE_ALL :
984                                         FB_EVENT_MODE_CHANGE;
985
986                                 info->flags &= ~FBINFO_MISC_USEREVENT;
987                                 event.info = info;
988                                 event.data = &mode;
989                                 fb_notifier_call_chain(evnt, &event);
990                         }
991                 }
992         }
993
994  done:
995         return ret;
996 }
997
998 int
999 fb_blank(struct fb_info *info, int blank)
1000 {       
1001         int ret = -EINVAL;
1002
1003         if (blank > FB_BLANK_POWERDOWN)
1004                 blank = FB_BLANK_POWERDOWN;
1005
1006         if (info->fbops->fb_blank)
1007                 ret = info->fbops->fb_blank(blank, info);
1008
1009         if (!ret) {
1010                 struct fb_event event;
1011
1012                 event.info = info;
1013                 event.data = &blank;
1014                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1015         }
1016
1017         return ret;
1018 }
1019
1020 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1021                         unsigned long arg)
1022 {
1023         struct fb_ops *fb;
1024         struct fb_var_screeninfo var;
1025         struct fb_fix_screeninfo fix;
1026         struct fb_con2fbmap con2fb;
1027         struct fb_cmap cmap_from;
1028         struct fb_cmap_user cmap;
1029         struct fb_event event;
1030         void __user *argp = (void __user *)arg;
1031         long ret = 0;
1032
1033         switch (cmd) {
1034         case FBIOGET_VSCREENINFO:
1035                 if (!lock_fb_info(info))
1036                         return -ENODEV;
1037                 var = info->var;
1038                 unlock_fb_info(info);
1039
1040                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1041                 break;
1042         case FBIOPUT_VSCREENINFO:
1043                 if (copy_from_user(&var, argp, sizeof(var)))
1044                         return -EFAULT;
1045                 if (!lock_fb_info(info))
1046                         return -ENODEV;
1047                 acquire_console_sem();
1048                 info->flags |= FBINFO_MISC_USEREVENT;
1049                 ret = fb_set_var(info, &var);
1050                 info->flags &= ~FBINFO_MISC_USEREVENT;
1051                 release_console_sem();
1052                 unlock_fb_info(info);
1053                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1054                         ret = -EFAULT;
1055                 break;
1056         case FBIOGET_FSCREENINFO:
1057                 if (!lock_fb_info(info))
1058                         return -ENODEV;
1059                 fix = info->fix;
1060                 unlock_fb_info(info);
1061
1062                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1063                 break;
1064         case FBIOPUTCMAP:
1065                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1066                         return -EFAULT;
1067                 ret = fb_set_user_cmap(&cmap, info);
1068                 break;
1069         case FBIOGETCMAP:
1070                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1071                         return -EFAULT;
1072                 if (!lock_fb_info(info))
1073                         return -ENODEV;
1074                 cmap_from = info->cmap;
1075                 unlock_fb_info(info);
1076                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1077                 break;
1078         case FBIOPAN_DISPLAY:
1079                 if (copy_from_user(&var, argp, sizeof(var)))
1080                         return -EFAULT;
1081                 if (!lock_fb_info(info))
1082                         return -ENODEV;
1083                 acquire_console_sem();
1084                 ret = fb_pan_display(info, &var);
1085                 release_console_sem();
1086                 unlock_fb_info(info);
1087                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1088                         return -EFAULT;
1089                 break;
1090         case FBIO_CURSOR:
1091                 ret = -EINVAL;
1092                 break;
1093         case FBIOGET_CON2FBMAP:
1094                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1095                         return -EFAULT;
1096                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1097                         return -EINVAL;
1098                 con2fb.framebuffer = -1;
1099                 event.data = &con2fb;
1100                 if (!lock_fb_info(info))
1101                         return -ENODEV;
1102                 event.info = info;
1103                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1104                 unlock_fb_info(info);
1105                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1106                 break;
1107         case FBIOPUT_CON2FBMAP:
1108                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1109                         return -EFAULT;
1110                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1111                         return -EINVAL;
1112                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1113                         return -EINVAL;
1114                 if (!registered_fb[con2fb.framebuffer])
1115                         request_module("fb%d", con2fb.framebuffer);
1116                 if (!registered_fb[con2fb.framebuffer]) {
1117                         ret = -EINVAL;
1118                         break;
1119                 }
1120                 event.data = &con2fb;
1121                 if (!lock_fb_info(info))
1122                         return -ENODEV;
1123                 event.info = info;
1124                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1125                 unlock_fb_info(info);
1126                 break;
1127         case FBIOBLANK:
1128                 if (!lock_fb_info(info))
1129                         return -ENODEV;
1130                 acquire_console_sem();
1131                 info->flags |= FBINFO_MISC_USEREVENT;
1132                 ret = fb_blank(info, arg);
1133                 info->flags &= ~FBINFO_MISC_USEREVENT;
1134                 release_console_sem();
1135                 unlock_fb_info(info);
1136                 break;
1137         default:
1138                 if (!lock_fb_info(info))
1139                         return -ENODEV;
1140                 fb = info->fbops;
1141                 if (fb->fb_ioctl)
1142                         ret = fb->fb_ioctl(info, cmd, arg);
1143                 else
1144                         ret = -ENOTTY;
1145                 unlock_fb_info(info);
1146         }
1147         return ret;
1148 }
1149
1150 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1151 {
1152         struct inode *inode = file->f_path.dentry->d_inode;
1153         int fbidx = iminor(inode);
1154         struct fb_info *info = registered_fb[fbidx];
1155
1156         return do_fb_ioctl(info, cmd, arg);
1157 }
1158
1159 #ifdef CONFIG_COMPAT
1160 struct fb_fix_screeninfo32 {
1161         char                    id[16];
1162         compat_caddr_t          smem_start;
1163         u32                     smem_len;
1164         u32                     type;
1165         u32                     type_aux;
1166         u32                     visual;
1167         u16                     xpanstep;
1168         u16                     ypanstep;
1169         u16                     ywrapstep;
1170         u32                     line_length;
1171         compat_caddr_t          mmio_start;
1172         u32                     mmio_len;
1173         u32                     accel;
1174         u16                     reserved[3];
1175 };
1176
1177 struct fb_cmap32 {
1178         u32                     start;
1179         u32                     len;
1180         compat_caddr_t  red;
1181         compat_caddr_t  green;
1182         compat_caddr_t  blue;
1183         compat_caddr_t  transp;
1184 };
1185
1186 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1187                           unsigned long arg)
1188 {
1189         struct fb_cmap_user __user *cmap;
1190         struct fb_cmap32 __user *cmap32;
1191         __u32 data;
1192         int err;
1193
1194         cmap = compat_alloc_user_space(sizeof(*cmap));
1195         cmap32 = compat_ptr(arg);
1196
1197         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1198                 return -EFAULT;
1199
1200         if (get_user(data, &cmap32->red) ||
1201             put_user(compat_ptr(data), &cmap->red) ||
1202             get_user(data, &cmap32->green) ||
1203             put_user(compat_ptr(data), &cmap->green) ||
1204             get_user(data, &cmap32->blue) ||
1205             put_user(compat_ptr(data), &cmap->blue) ||
1206             get_user(data, &cmap32->transp) ||
1207             put_user(compat_ptr(data), &cmap->transp))
1208                 return -EFAULT;
1209
1210         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1211
1212         if (!err) {
1213                 if (copy_in_user(&cmap32->start,
1214                                  &cmap->start,
1215                                  2 * sizeof(__u32)))
1216                         err = -EFAULT;
1217         }
1218         return err;
1219 }
1220
1221 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1222                                   struct fb_fix_screeninfo32 __user *fix32)
1223 {
1224         __u32 data;
1225         int err;
1226
1227         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1228
1229         data = (__u32) (unsigned long) fix->smem_start;
1230         err |= put_user(data, &fix32->smem_start);
1231
1232         err |= put_user(fix->smem_len, &fix32->smem_len);
1233         err |= put_user(fix->type, &fix32->type);
1234         err |= put_user(fix->type_aux, &fix32->type_aux);
1235         err |= put_user(fix->visual, &fix32->visual);
1236         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1237         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1238         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1239         err |= put_user(fix->line_length, &fix32->line_length);
1240
1241         data = (__u32) (unsigned long) fix->mmio_start;
1242         err |= put_user(data, &fix32->mmio_start);
1243
1244         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1245         err |= put_user(fix->accel, &fix32->accel);
1246         err |= copy_to_user(fix32->reserved, fix->reserved,
1247                             sizeof(fix->reserved));
1248
1249         return err;
1250 }
1251
1252 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1253                               unsigned long arg)
1254 {
1255         mm_segment_t old_fs;
1256         struct fb_fix_screeninfo fix;
1257         struct fb_fix_screeninfo32 __user *fix32;
1258         int err;
1259
1260         fix32 = compat_ptr(arg);
1261
1262         old_fs = get_fs();
1263         set_fs(KERNEL_DS);
1264         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1265         set_fs(old_fs);
1266
1267         if (!err)
1268                 err = do_fscreeninfo_to_user(&fix, fix32);
1269
1270         return err;
1271 }
1272
1273 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1274                             unsigned long arg)
1275 {
1276         struct inode *inode = file->f_path.dentry->d_inode;
1277         int fbidx = iminor(inode);
1278         struct fb_info *info = registered_fb[fbidx];
1279         struct fb_ops *fb = info->fbops;
1280         long ret = -ENOIOCTLCMD;
1281
1282         switch(cmd) {
1283         case FBIOGET_VSCREENINFO:
1284         case FBIOPUT_VSCREENINFO:
1285         case FBIOPAN_DISPLAY:
1286         case FBIOGET_CON2FBMAP:
1287         case FBIOPUT_CON2FBMAP:
1288                 arg = (unsigned long) compat_ptr(arg);
1289         case FBIOBLANK:
1290                 ret = do_fb_ioctl(info, cmd, arg);
1291                 break;
1292
1293         case FBIOGET_FSCREENINFO:
1294                 ret = fb_get_fscreeninfo(info, cmd, arg);
1295                 break;
1296
1297         case FBIOGETCMAP:
1298         case FBIOPUTCMAP:
1299                 ret = fb_getput_cmap(info, cmd, arg);
1300                 break;
1301
1302         default:
1303                 if (fb->fb_compat_ioctl)
1304                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1305                 break;
1306         }
1307         return ret;
1308 }
1309 #endif
1310
1311 static int
1312 fb_mmap(struct file *file, struct vm_area_struct * vma)
1313 __acquires(&info->lock)
1314 __releases(&info->lock)
1315 {
1316         int fbidx = iminor(file->f_path.dentry->d_inode);
1317         struct fb_info *info = registered_fb[fbidx];
1318         struct fb_ops *fb = info->fbops;
1319         unsigned long off;
1320         unsigned long start;
1321         u32 len;
1322
1323         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1324                 return -EINVAL;
1325         off = vma->vm_pgoff << PAGE_SHIFT;
1326         if (!fb)
1327                 return -ENODEV;
1328         if (fb->fb_mmap) {
1329                 int res;
1330                 mutex_lock(&info->lock);
1331                 res = fb->fb_mmap(info, vma);
1332                 mutex_unlock(&info->lock);
1333                 return res;
1334         }
1335
1336         mutex_lock(&info->lock);
1337
1338         /* frame buffer memory */
1339         start = info->fix.smem_start;
1340         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1341         if (off >= len) {
1342                 /* memory mapped io */
1343                 off -= len;
1344                 if (info->var.accel_flags) {
1345                         mutex_unlock(&info->lock);
1346                         return -EINVAL;
1347                 }
1348                 start = info->fix.mmio_start;
1349                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1350         }
1351         mutex_unlock(&info->lock);
1352         start &= PAGE_MASK;
1353         if ((vma->vm_end - vma->vm_start + off) > len)
1354                 return -EINVAL;
1355         off += start;
1356         vma->vm_pgoff = off >> PAGE_SHIFT;
1357         /* This is an IO map - tell maydump to skip this VMA */
1358         vma->vm_flags |= VM_IO | VM_RESERVED;
1359         fb_pgprotect(file, vma, off);
1360         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1361                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1362                 return -EAGAIN;
1363         return 0;
1364 }
1365
1366 static int
1367 fb_open(struct inode *inode, struct file *file)
1368 __acquires(&info->lock)
1369 __releases(&info->lock)
1370 {
1371         int fbidx = iminor(inode);
1372         struct fb_info *info;
1373         int res = 0;
1374
1375         if (fbidx >= FB_MAX)
1376                 return -ENODEV;
1377         info = registered_fb[fbidx];
1378         if (!info)
1379                 request_module("fb%d", fbidx);
1380         info = registered_fb[fbidx];
1381         if (!info)
1382                 return -ENODEV;
1383         mutex_lock(&info->lock);
1384         if (!try_module_get(info->fbops->owner)) {
1385                 res = -ENODEV;
1386                 goto out;
1387         }
1388         file->private_data = info;
1389         if (info->fbops->fb_open) {
1390                 res = info->fbops->fb_open(info,1);
1391                 if (res)
1392                         module_put(info->fbops->owner);
1393         }
1394 #ifdef CONFIG_FB_DEFERRED_IO
1395         if (info->fbdefio)
1396                 fb_deferred_io_open(info, inode, file);
1397 #endif
1398 out:
1399         mutex_unlock(&info->lock);
1400         return res;
1401 }
1402
1403 static int 
1404 fb_release(struct inode *inode, struct file *file)
1405 __acquires(&info->lock)
1406 __releases(&info->lock)
1407 {
1408         struct fb_info * const info = file->private_data;
1409
1410         mutex_lock(&info->lock);
1411         if (info->fbops->fb_release)
1412                 info->fbops->fb_release(info,1);
1413         module_put(info->fbops->owner);
1414         mutex_unlock(&info->lock);
1415         return 0;
1416 }
1417
1418 static const struct file_operations fb_fops = {
1419         .owner =        THIS_MODULE,
1420         .read =         fb_read,
1421         .write =        fb_write,
1422         .unlocked_ioctl = fb_ioctl,
1423 #ifdef CONFIG_COMPAT
1424         .compat_ioctl = fb_compat_ioctl,
1425 #endif
1426         .mmap =         fb_mmap,
1427         .open =         fb_open,
1428         .release =      fb_release,
1429 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1430         .get_unmapped_area = get_fb_unmapped_area,
1431 #endif
1432 #ifdef CONFIG_FB_DEFERRED_IO
1433         .fsync =        fb_deferred_io_fsync,
1434 #endif
1435 };
1436
1437 struct class *fb_class;
1438 EXPORT_SYMBOL(fb_class);
1439
1440 static int fb_check_foreignness(struct fb_info *fi)
1441 {
1442         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1443
1444         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1445
1446 #ifdef __BIG_ENDIAN
1447         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1448 #else
1449         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1450 #endif /* __BIG_ENDIAN */
1451
1452         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1453                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1454                        "support this framebuffer\n", fi->fix.id);
1455                 return -ENOSYS;
1456         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1457                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1458                        "support this framebuffer\n", fi->fix.id);
1459                 return -ENOSYS;
1460         }
1461
1462         return 0;
1463 }
1464
1465 /**
1466  *      register_framebuffer - registers a frame buffer device
1467  *      @fb_info: frame buffer info structure
1468  *
1469  *      Registers a frame buffer device @fb_info.
1470  *
1471  *      Returns negative errno on error, or zero for success.
1472  *
1473  */
1474
1475 int
1476 register_framebuffer(struct fb_info *fb_info)
1477 {
1478         int i;
1479         struct fb_event event;
1480         struct fb_videomode mode;
1481
1482         if (num_registered_fb == FB_MAX)
1483                 return -ENXIO;
1484
1485         if (fb_check_foreignness(fb_info))
1486                 return -ENOSYS;
1487
1488         num_registered_fb++;
1489         for (i = 0 ; i < FB_MAX; i++)
1490                 if (!registered_fb[i])
1491                         break;
1492         fb_info->node = i;
1493         mutex_init(&fb_info->lock);
1494
1495         fb_info->dev = device_create(fb_class, fb_info->device,
1496                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1497         if (IS_ERR(fb_info->dev)) {
1498                 /* Not fatal */
1499                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1500                 fb_info->dev = NULL;
1501         } else
1502                 fb_init_device(fb_info);
1503
1504         if (fb_info->pixmap.addr == NULL) {
1505                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1506                 if (fb_info->pixmap.addr) {
1507                         fb_info->pixmap.size = FBPIXMAPSIZE;
1508                         fb_info->pixmap.buf_align = 1;
1509                         fb_info->pixmap.scan_align = 1;
1510                         fb_info->pixmap.access_align = 32;
1511                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1512                 }
1513         }       
1514         fb_info->pixmap.offset = 0;
1515
1516         if (!fb_info->pixmap.blit_x)
1517                 fb_info->pixmap.blit_x = ~(u32)0;
1518
1519         if (!fb_info->pixmap.blit_y)
1520                 fb_info->pixmap.blit_y = ~(u32)0;
1521
1522         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1523                 INIT_LIST_HEAD(&fb_info->modelist);
1524
1525         fb_var_to_videomode(&mode, &fb_info->var);
1526         fb_add_videomode(&mode, &fb_info->modelist);
1527         registered_fb[i] = fb_info;
1528
1529         event.info = fb_info;
1530         if (!lock_fb_info(fb_info))
1531                 return -ENODEV;
1532         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1533         unlock_fb_info(fb_info);
1534         return 0;
1535 }
1536
1537
1538 /**
1539  *      unregister_framebuffer - releases a frame buffer device
1540  *      @fb_info: frame buffer info structure
1541  *
1542  *      Unregisters a frame buffer device @fb_info.
1543  *
1544  *      Returns negative errno on error, or zero for success.
1545  *
1546  *      This function will also notify the framebuffer console
1547  *      to release the driver.
1548  *
1549  *      This is meant to be called within a driver's module_exit()
1550  *      function. If this is called outside module_exit(), ensure
1551  *      that the driver implements fb_open() and fb_release() to
1552  *      check that no processes are using the device.
1553  */
1554
1555 int
1556 unregister_framebuffer(struct fb_info *fb_info)
1557 {
1558         struct fb_event event;
1559         int i, ret = 0;
1560
1561         i = fb_info->node;
1562         if (!registered_fb[i]) {
1563                 ret = -EINVAL;
1564                 goto done;
1565         }
1566
1567
1568         if (!lock_fb_info(fb_info))
1569                 return -ENODEV;
1570         event.info = fb_info;
1571         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1572         unlock_fb_info(fb_info);
1573
1574         if (ret) {
1575                 ret = -EINVAL;
1576                 goto done;
1577         }
1578
1579         if (fb_info->pixmap.addr &&
1580             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1581                 kfree(fb_info->pixmap.addr);
1582         fb_destroy_modelist(&fb_info->modelist);
1583         registered_fb[i]=NULL;
1584         num_registered_fb--;
1585         fb_cleanup_device(fb_info);
1586         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1587         event.info = fb_info;
1588         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1589 done:
1590         return ret;
1591 }
1592
1593 /**
1594  *      fb_set_suspend - low level driver signals suspend
1595  *      @info: framebuffer affected
1596  *      @state: 0 = resuming, !=0 = suspending
1597  *
1598  *      This is meant to be used by low level drivers to
1599  *      signal suspend/resume to the core & clients.
1600  *      It must be called with the console semaphore held
1601  */
1602 void fb_set_suspend(struct fb_info *info, int state)
1603 {
1604         struct fb_event event;
1605
1606         if (!lock_fb_info(info))
1607                 return;
1608         event.info = info;
1609         if (state) {
1610                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1611                 info->state = FBINFO_STATE_SUSPENDED;
1612         } else {
1613                 info->state = FBINFO_STATE_RUNNING;
1614                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1615         }
1616         unlock_fb_info(info);
1617 }
1618
1619 /**
1620  *      fbmem_init - init frame buffer subsystem
1621  *
1622  *      Initialize the frame buffer subsystem.
1623  *
1624  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1625  *
1626  */
1627
1628 static int __init
1629 fbmem_init(void)
1630 {
1631         proc_create("fb", 0, NULL, &fb_proc_fops);
1632
1633         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1634                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1635
1636         fb_class = class_create(THIS_MODULE, "graphics");
1637         if (IS_ERR(fb_class)) {
1638                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1639                 fb_class = NULL;
1640         }
1641         return 0;
1642 }
1643
1644 #ifdef MODULE
1645 module_init(fbmem_init);
1646 static void __exit
1647 fbmem_exit(void)
1648 {
1649         remove_proc_entry("fb", NULL);
1650         class_destroy(fb_class);
1651         unregister_chrdev(FB_MAJOR, "fb");
1652 }
1653
1654 module_exit(fbmem_exit);
1655 MODULE_LICENSE("GPL");
1656 MODULE_DESCRIPTION("Framebuffer base");
1657 #else
1658 subsys_initcall(fbmem_init);
1659 #endif
1660
1661 int fb_new_modelist(struct fb_info *info)
1662 {
1663         struct fb_event event;
1664         struct fb_var_screeninfo var = info->var;
1665         struct list_head *pos, *n;
1666         struct fb_modelist *modelist;
1667         struct fb_videomode *m, mode;
1668         int err = 1;
1669
1670         list_for_each_safe(pos, n, &info->modelist) {
1671                 modelist = list_entry(pos, struct fb_modelist, list);
1672                 m = &modelist->mode;
1673                 fb_videomode_to_var(&var, m);
1674                 var.activate = FB_ACTIVATE_TEST;
1675                 err = fb_set_var(info, &var);
1676                 fb_var_to_videomode(&mode, &var);
1677                 if (err || !fb_mode_is_equal(m, &mode)) {
1678                         list_del(pos);
1679                         kfree(pos);
1680                 }
1681         }
1682
1683         err = 1;
1684
1685         if (!list_empty(&info->modelist)) {
1686                 if (!lock_fb_info(info))
1687                         return -ENODEV;
1688                 event.info = info;
1689                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1690                 unlock_fb_info(info);
1691         }
1692
1693         return err;
1694 }
1695
1696 static char *video_options[FB_MAX] __read_mostly;
1697 static int ofonly __read_mostly;
1698
1699 /**
1700  * fb_get_options - get kernel boot parameters
1701  * @name:   framebuffer name as it would appear in
1702  *          the boot parameter line
1703  *          (video=<name>:<options>)
1704  * @option: the option will be stored here
1705  *
1706  * NOTE: Needed to maintain backwards compatibility
1707  */
1708 int fb_get_options(char *name, char **option)
1709 {
1710         char *opt, *options = NULL;
1711         int opt_len, retval = 0;
1712         int name_len = strlen(name), i;
1713
1714         if (name_len && ofonly && strncmp(name, "offb", 4))
1715                 retval = 1;
1716
1717         if (name_len && !retval) {
1718                 for (i = 0; i < FB_MAX; i++) {
1719                         if (video_options[i] == NULL)
1720                                 continue;
1721                         opt_len = strlen(video_options[i]);
1722                         if (!opt_len)
1723                                 continue;
1724                         opt = video_options[i];
1725                         if (!strncmp(name, opt, name_len) &&
1726                             opt[name_len] == ':')
1727                                 options = opt + name_len + 1;
1728                 }
1729         }
1730         if (options && !strncmp(options, "off", 3))
1731                 retval = 1;
1732
1733         if (option)
1734                 *option = options;
1735
1736         return retval;
1737 }
1738
1739 #ifndef MODULE
1740 /**
1741  *      video_setup - process command line options
1742  *      @options: string of options
1743  *
1744  *      Process command line options for frame buffer subsystem.
1745  *
1746  *      NOTE: This function is a __setup and __init function.
1747  *            It only stores the options.  Drivers have to call
1748  *            fb_get_options() as necessary.
1749  *
1750  *      Returns zero.
1751  *
1752  */
1753 static int __init video_setup(char *options)
1754 {
1755         int i, global = 0;
1756
1757         if (!options || !*options)
1758                 global = 1;
1759
1760         if (!global && !strncmp(options, "ofonly", 6)) {
1761                 ofonly = 1;
1762                 global = 1;
1763         }
1764
1765         if (!global && !strstr(options, "fb:")) {
1766                 fb_mode_option = options;
1767                 global = 1;
1768         }
1769
1770         if (!global) {
1771                 for (i = 0; i < FB_MAX; i++) {
1772                         if (video_options[i] == NULL) {
1773                                 video_options[i] = options;
1774                                 break;
1775                         }
1776
1777                 }
1778         }
1779
1780         return 1;
1781 }
1782 __setup("video=", video_setup);
1783 #endif
1784
1785     /*
1786      *  Visible symbols for modules
1787      */
1788
1789 EXPORT_SYMBOL(register_framebuffer);
1790 EXPORT_SYMBOL(unregister_framebuffer);
1791 EXPORT_SYMBOL(num_registered_fb);
1792 EXPORT_SYMBOL(registered_fb);
1793 EXPORT_SYMBOL(fb_show_logo);
1794 EXPORT_SYMBOL(fb_set_var);
1795 EXPORT_SYMBOL(fb_blank);
1796 EXPORT_SYMBOL(fb_pan_display);
1797 EXPORT_SYMBOL(fb_get_buffer_offset);
1798 EXPORT_SYMBOL(fb_set_suspend);
1799 EXPORT_SYMBOL(fb_get_options);
1800
1801 MODULE_LICENSE("GPL");