Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
[linux-2.6.git] / drivers / video / fbmem.c
1 /*
2  *  linux/drivers/video/fbmem.c
3  *
4  *  Copyright (C) 1994 Martin Schaller
5  *
6  *      2001 - Documented with DocBook
7  *      - Brad Douglas <brad@neruo.com>
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive
11  * for more details.
12  */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/smp_lock.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/mman.h>
25 #include <linux/vt.h>
26 #include <linux/init.h>
27 #include <linux/linux_logo.h>
28 #include <linux/proc_fs.h>
29 #include <linux/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 /*
50  * Helpers
51  */
52
53 int fb_get_color_depth(struct fb_var_screeninfo *var,
54                        struct fb_fix_screeninfo *fix)
55 {
56         int depth = 0;
57
58         if (fix->visual == FB_VISUAL_MONO01 ||
59             fix->visual == FB_VISUAL_MONO10)
60                 depth = 1;
61         else {
62                 if (var->green.length == var->blue.length &&
63                     var->green.length == var->red.length &&
64                     var->green.offset == var->blue.offset &&
65                     var->green.offset == var->red.offset)
66                         depth = var->green.length;
67                 else
68                         depth = var->green.length + var->red.length +
69                                 var->blue.length;
70         }
71
72         return depth;
73 }
74 EXPORT_SYMBOL(fb_get_color_depth);
75
76 /*
77  * Data padding functions.
78  */
79 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
80 {
81         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
82 }
83 EXPORT_SYMBOL(fb_pad_aligned_buffer);
84
85 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
86                                 u32 shift_high, u32 shift_low, u32 mod)
87 {
88         u8 mask = (u8) (0xfff << shift_high), tmp;
89         int i, j;
90
91         for (i = height; i--; ) {
92                 for (j = 0; j < idx; j++) {
93                         tmp = dst[j];
94                         tmp &= mask;
95                         tmp |= *src >> shift_low;
96                         dst[j] = tmp;
97                         tmp = *src << shift_high;
98                         dst[j+1] = tmp;
99                         src++;
100                 }
101                 tmp = dst[idx];
102                 tmp &= mask;
103                 tmp |= *src >> shift_low;
104                 dst[idx] = tmp;
105                 if (shift_high < mod) {
106                         tmp = *src << shift_high;
107                         dst[idx+1] = tmp;
108                 }
109                 src++;
110                 dst += d_pitch;
111         }
112 }
113 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
114
115 /*
116  * we need to lock this section since fb_cursor
117  * may use fb_imageblit()
118  */
119 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
120 {
121         u32 align = buf->buf_align - 1, offset;
122         char *addr = buf->addr;
123
124         /* If IO mapped, we need to sync before access, no sharing of
125          * the pixmap is done
126          */
127         if (buf->flags & FB_PIXMAP_IO) {
128                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
129                         info->fbops->fb_sync(info);
130                 return addr;
131         }
132
133         /* See if we fit in the remaining pixmap space */
134         offset = buf->offset + align;
135         offset &= ~align;
136         if (offset + size > buf->size) {
137                 /* We do not fit. In order to be able to re-use the buffer,
138                  * we must ensure no asynchronous DMA'ing or whatever operation
139                  * is in progress, we sync for that.
140                  */
141                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142                         info->fbops->fb_sync(info);
143                 offset = 0;
144         }
145         buf->offset = offset + size;
146         addr += offset;
147
148         return addr;
149 }
150
151 #ifdef CONFIG_LOGO
152
153 static inline unsigned safe_shift(unsigned d, int n)
154 {
155         return n < 0 ? d >> -n : d << n;
156 }
157
158 static void fb_set_logocmap(struct fb_info *info,
159                                    const struct linux_logo *logo)
160 {
161         struct fb_cmap palette_cmap;
162         u16 palette_green[16];
163         u16 palette_blue[16];
164         u16 palette_red[16];
165         int i, j, n;
166         const unsigned char *clut = logo->clut;
167
168         palette_cmap.start = 0;
169         palette_cmap.len = 16;
170         palette_cmap.red = palette_red;
171         palette_cmap.green = palette_green;
172         palette_cmap.blue = palette_blue;
173         palette_cmap.transp = NULL;
174
175         for (i = 0; i < logo->clutsize; i += n) {
176                 n = logo->clutsize - i;
177                 /* palette_cmap provides space for only 16 colors at once */
178                 if (n > 16)
179                         n = 16;
180                 palette_cmap.start = 32 + i;
181                 palette_cmap.len = n;
182                 for (j = 0; j < n; ++j) {
183                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
184                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
185                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
186                         clut += 3;
187                 }
188                 fb_set_cmap(&palette_cmap, info);
189         }
190 }
191
192 static void  fb_set_logo_truepalette(struct fb_info *info,
193                                             const struct linux_logo *logo,
194                                             u32 *palette)
195 {
196         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
197         unsigned char redmask, greenmask, bluemask;
198         int redshift, greenshift, blueshift;
199         int i;
200         const unsigned char *clut = logo->clut;
201
202         /*
203          * We have to create a temporary palette since console palette is only
204          * 16 colors long.
205          */
206         /* Bug: Doesn't obey msb_right ... (who needs that?) */
207         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
208         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
209         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
210         redshift   = info->var.red.offset   - (8 - info->var.red.length);
211         greenshift = info->var.green.offset - (8 - info->var.green.length);
212         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
213
214         for ( i = 0; i < logo->clutsize; i++) {
215                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
216                                  safe_shift((clut[1] & greenmask), greenshift) |
217                                  safe_shift((clut[2] & bluemask), blueshift));
218                 clut += 3;
219         }
220 }
221
222 static void fb_set_logo_directpalette(struct fb_info *info,
223                                              const struct linux_logo *logo,
224                                              u32 *palette)
225 {
226         int redshift, greenshift, blueshift;
227         int i;
228
229         redshift = info->var.red.offset;
230         greenshift = info->var.green.offset;
231         blueshift = info->var.blue.offset;
232
233         for (i = 32; i < logo->clutsize; i++)
234                 palette[i] = i << redshift | i << greenshift | i << blueshift;
235 }
236
237 static void fb_set_logo(struct fb_info *info,
238                                const struct linux_logo *logo, u8 *dst,
239                                int depth)
240 {
241         int i, j, k;
242         const u8 *src = logo->data;
243         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
244         u8 fg = 1, d;
245
246         switch (fb_get_color_depth(&info->var, &info->fix)) {
247         case 1:
248                 fg = 1;
249                 break;
250         case 2:
251                 fg = 3;
252                 break;
253         default:
254                 fg = 7;
255                 break;
256         }
257
258         if (info->fix.visual == FB_VISUAL_MONO01 ||
259             info->fix.visual == FB_VISUAL_MONO10)
260                 fg = ~((u8) (0xfff << info->var.green.length));
261
262         switch (depth) {
263         case 4:
264                 for (i = 0; i < logo->height; i++)
265                         for (j = 0; j < logo->width; src++) {
266                                 *dst++ = *src >> 4;
267                                 j++;
268                                 if (j < logo->width) {
269                                         *dst++ = *src & 0x0f;
270                                         j++;
271                                 }
272                         }
273                 break;
274         case 1:
275                 for (i = 0; i < logo->height; i++) {
276                         for (j = 0; j < logo->width; src++) {
277                                 d = *src ^ xor;
278                                 for (k = 7; k >= 0; k--) {
279                                         *dst++ = ((d >> k) & 1) ? fg : 0;
280                                         j++;
281                                 }
282                         }
283                 }
284                 break;
285         }
286 }
287
288 /*
289  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
290  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
291  * the visual format and color depth of the framebuffer, the DAC, the
292  * pseudo_palette, and the logo data will be adjusted accordingly.
293  *
294  * Case 1 - linux_logo_clut224:
295  * Color exceeds the number of console colors (16), thus we set the hardware DAC
296  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
297  *
298  * For visuals that require color info from the pseudo_palette, we also construct
299  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
300  * will be set.
301  *
302  * Case 2 - linux_logo_vga16:
303  * The number of colors just matches the console colors, thus there is no need
304  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
305  * each byte contains color information for two pixels (upper and lower nibble).
306  * To be consistent with fb_imageblit() usage, we therefore separate the two
307  * nibbles into separate bytes. The "depth" flag will be set to 4.
308  *
309  * Case 3 - linux_logo_mono:
310  * This is similar with Case 2.  Each byte contains information for 8 pixels.
311  * We isolate each bit and expand each into a byte. The "depth" flag will
312  * be set to 1.
313  */
314 static struct logo_data {
315         int depth;
316         int needs_directpalette;
317         int needs_truepalette;
318         int needs_cmapreset;
319         const struct linux_logo *logo;
320 } fb_logo __read_mostly;
321
322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
323 {
324         u32 size = width * height, i;
325
326         out += size - 1;
327
328         for (i = size; i--; )
329                 *out-- = *in++;
330 }
331
332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334         int i, j, h = height - 1;
335
336         for (i = 0; i < height; i++)
337                 for (j = 0; j < width; j++)
338                                 out[height * j + h - i] = *in++;
339 }
340
341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
342 {
343         int i, j, w = width - 1;
344
345         for (i = 0; i < height; i++)
346                 for (j = 0; j < width; j++)
347                         out[height * (w - j) + i] = *in++;
348 }
349
350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
351                            struct fb_image *image, int rotate)
352 {
353         u32 tmp;
354
355         if (rotate == FB_ROTATE_UD) {
356                 fb_rotate_logo_ud(image->data, dst, image->width,
357                                   image->height);
358                 image->dx = info->var.xres - image->width - image->dx;
359                 image->dy = info->var.yres - image->height - image->dy;
360         } else if (rotate == FB_ROTATE_CW) {
361                 fb_rotate_logo_cw(image->data, dst, image->width,
362                                   image->height);
363                 tmp = image->width;
364                 image->width = image->height;
365                 image->height = tmp;
366                 tmp = image->dy;
367                 image->dy = image->dx;
368                 image->dx = info->var.xres - image->width - tmp;
369         } else if (rotate == FB_ROTATE_CCW) {
370                 fb_rotate_logo_ccw(image->data, dst, image->width,
371                                    image->height);
372                 tmp = image->width;
373                 image->width = image->height;
374                 image->height = tmp;
375                 tmp = image->dx;
376                 image->dx = image->dy;
377                 image->dy = info->var.yres - image->height - tmp;
378         }
379
380         image->data = dst;
381 }
382
383 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
384                             int rotate, unsigned int num)
385 {
386         unsigned int x;
387
388         if (rotate == FB_ROTATE_UR) {
389                 for (x = 0;
390                      x < num && image->dx + image->width <= info->var.xres;
391                      x++) {
392                         info->fbops->fb_imageblit(info, image);
393                         image->dx += image->width + 8;
394                 }
395         } else if (rotate == FB_ROTATE_UD) {
396                 for (x = 0; x < num && image->dx >= 0; x++) {
397                         info->fbops->fb_imageblit(info, image);
398                         image->dx -= image->width + 8;
399                 }
400         } else if (rotate == FB_ROTATE_CW) {
401                 for (x = 0;
402                      x < num && image->dy + image->height <= info->var.yres;
403                      x++) {
404                         info->fbops->fb_imageblit(info, image);
405                         image->dy += image->height + 8;
406                 }
407         } else if (rotate == FB_ROTATE_CCW) {
408                 for (x = 0; x < num && image->dy >= 0; x++) {
409                         info->fbops->fb_imageblit(info, image);
410                         image->dy -= image->height + 8;
411                 }
412         }
413 }
414
415 static int fb_show_logo_line(struct fb_info *info, int rotate,
416                              const struct linux_logo *logo, int y,
417                              unsigned int n)
418 {
419         u32 *palette = NULL, *saved_pseudo_palette = NULL;
420         unsigned char *logo_new = NULL, *logo_rotate = NULL;
421         struct fb_image image;
422
423         /* Return if the frame buffer is not mapped or suspended */
424         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
425             info->flags & FBINFO_MODULE)
426                 return 0;
427
428         image.depth = 8;
429         image.data = logo->data;
430
431         if (fb_logo.needs_cmapreset)
432                 fb_set_logocmap(info, logo);
433
434         if (fb_logo.needs_truepalette ||
435             fb_logo.needs_directpalette) {
436                 palette = kmalloc(256 * 4, GFP_KERNEL);
437                 if (palette == NULL)
438                         return 0;
439
440                 if (fb_logo.needs_truepalette)
441                         fb_set_logo_truepalette(info, logo, palette);
442                 else
443                         fb_set_logo_directpalette(info, logo, palette);
444
445                 saved_pseudo_palette = info->pseudo_palette;
446                 info->pseudo_palette = palette;
447         }
448
449         if (fb_logo.depth <= 4) {
450                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
451                 if (logo_new == NULL) {
452                         kfree(palette);
453                         if (saved_pseudo_palette)
454                                 info->pseudo_palette = saved_pseudo_palette;
455                         return 0;
456                 }
457                 image.data = logo_new;
458                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
459         }
460
461         image.dx = 0;
462         image.dy = y;
463         image.width = logo->width;
464         image.height = logo->height;
465
466         if (rotate) {
467                 logo_rotate = kmalloc(logo->width *
468                                       logo->height, GFP_KERNEL);
469                 if (logo_rotate)
470                         fb_rotate_logo(info, logo_rotate, &image, rotate);
471         }
472
473         fb_do_show_logo(info, &image, rotate, n);
474
475         kfree(palette);
476         if (saved_pseudo_palette != NULL)
477                 info->pseudo_palette = saved_pseudo_palette;
478         kfree(logo_new);
479         kfree(logo_rotate);
480         return logo->height;
481 }
482
483
484 #ifdef CONFIG_FB_LOGO_EXTRA
485
486 #define FB_LOGO_EX_NUM_MAX 10
487 static struct logo_data_extra {
488         const struct linux_logo *logo;
489         unsigned int n;
490 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
491 static unsigned int fb_logo_ex_num;
492
493 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
494 {
495         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
496                 return;
497
498         fb_logo_ex[fb_logo_ex_num].logo = logo;
499         fb_logo_ex[fb_logo_ex_num].n = n;
500         fb_logo_ex_num++;
501 }
502
503 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
504                                   unsigned int yres)
505 {
506         unsigned int i;
507
508         /* FIXME: logo_ex supports only truecolor fb. */
509         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
510                 fb_logo_ex_num = 0;
511
512         for (i = 0; i < fb_logo_ex_num; i++) {
513                 height += fb_logo_ex[i].logo->height;
514                 if (height > yres) {
515                         height -= fb_logo_ex[i].logo->height;
516                         fb_logo_ex_num = i;
517                         break;
518                 }
519         }
520         return height;
521 }
522
523 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
524 {
525         unsigned int i;
526
527         for (i = 0; i < fb_logo_ex_num; i++)
528                 y += fb_show_logo_line(info, rotate,
529                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
530
531         return y;
532 }
533
534 #else /* !CONFIG_FB_LOGO_EXTRA */
535
536 static inline int fb_prepare_extra_logos(struct fb_info *info,
537                                          unsigned int height,
538                                          unsigned int yres)
539 {
540         return height;
541 }
542
543 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
544 {
545         return y;
546 }
547
548 #endif /* CONFIG_FB_LOGO_EXTRA */
549
550
551 int fb_prepare_logo(struct fb_info *info, int rotate)
552 {
553         int depth = fb_get_color_depth(&info->var, &info->fix);
554         unsigned int yres;
555
556         memset(&fb_logo, 0, sizeof(struct logo_data));
557
558         if (info->flags & FBINFO_MISC_TILEBLITTING ||
559             info->flags & FBINFO_MODULE)
560                 return 0;
561
562         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
563                 depth = info->var.blue.length;
564                 if (info->var.red.length < depth)
565                         depth = info->var.red.length;
566                 if (info->var.green.length < depth)
567                         depth = info->var.green.length;
568         }
569
570         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
571                 /* assume console colormap */
572                 depth = 4;
573         }
574
575         /* Return if no suitable logo was found */
576         fb_logo.logo = fb_find_logo(depth);
577
578         if (!fb_logo.logo) {
579                 return 0;
580         }
581
582         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
583                 yres = info->var.yres;
584         else
585                 yres = info->var.xres;
586
587         if (fb_logo.logo->height > yres) {
588                 fb_logo.logo = NULL;
589                 return 0;
590         }
591
592         /* What depth we asked for might be different from what we get */
593         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
594                 fb_logo.depth = 8;
595         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
596                 fb_logo.depth = 4;
597         else
598                 fb_logo.depth = 1;
599
600
601         if (fb_logo.depth > 4 && depth > 4) {
602                 switch (info->fix.visual) {
603                 case FB_VISUAL_TRUECOLOR:
604                         fb_logo.needs_truepalette = 1;
605                         break;
606                 case FB_VISUAL_DIRECTCOLOR:
607                         fb_logo.needs_directpalette = 1;
608                         fb_logo.needs_cmapreset = 1;
609                         break;
610                 case FB_VISUAL_PSEUDOCOLOR:
611                         fb_logo.needs_cmapreset = 1;
612                         break;
613                 }
614         }
615
616         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
617 }
618
619 int fb_show_logo(struct fb_info *info, int rotate)
620 {
621         int y;
622
623         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
624                               num_online_cpus());
625         y = fb_show_extra_logos(info, y, rotate);
626
627         return y;
628 }
629 #else
630 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
631 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
632 #endif /* CONFIG_LOGO */
633
634 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
635 {
636         return (*pos < FB_MAX) ? pos : NULL;
637 }
638
639 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
640 {
641         (*pos)++;
642         return (*pos < FB_MAX) ? pos : NULL;
643 }
644
645 static void fb_seq_stop(struct seq_file *m, void *v)
646 {
647 }
648
649 static int fb_seq_show(struct seq_file *m, void *v)
650 {
651         int i = *(loff_t *)v;
652         struct fb_info *fi = registered_fb[i];
653
654         if (fi)
655                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
656         return 0;
657 }
658
659 static const struct seq_operations proc_fb_seq_ops = {
660         .start  = fb_seq_start,
661         .next   = fb_seq_next,
662         .stop   = fb_seq_stop,
663         .show   = fb_seq_show,
664 };
665
666 static int proc_fb_open(struct inode *inode, struct file *file)
667 {
668         return seq_open(file, &proc_fb_seq_ops);
669 }
670
671 static const struct file_operations fb_proc_fops = {
672         .owner          = THIS_MODULE,
673         .open           = proc_fb_open,
674         .read           = seq_read,
675         .llseek         = seq_lseek,
676         .release        = seq_release,
677 };
678
679 static ssize_t
680 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
681 {
682         unsigned long p = *ppos;
683         struct inode *inode = file->f_path.dentry->d_inode;
684         int fbidx = iminor(inode);
685         struct fb_info *info = registered_fb[fbidx];
686         u32 *buffer, *dst;
687         u32 __iomem *src;
688         int c, i, cnt = 0, err = 0;
689         unsigned long total_size;
690
691         if (!info || ! info->screen_base)
692                 return -ENODEV;
693
694         if (info->state != FBINFO_STATE_RUNNING)
695                 return -EPERM;
696
697         if (info->fbops->fb_read)
698                 return info->fbops->fb_read(info, buf, count, ppos);
699         
700         total_size = info->screen_size;
701
702         if (total_size == 0)
703                 total_size = info->fix.smem_len;
704
705         if (p >= total_size)
706                 return 0;
707
708         if (count >= total_size)
709                 count = total_size;
710
711         if (count + p > total_size)
712                 count = total_size - p;
713
714         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
715                          GFP_KERNEL);
716         if (!buffer)
717                 return -ENOMEM;
718
719         src = (u32 __iomem *) (info->screen_base + p);
720
721         if (info->fbops->fb_sync)
722                 info->fbops->fb_sync(info);
723
724         while (count) {
725                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
726                 dst = buffer;
727                 for (i = c >> 2; i--; )
728                         *dst++ = fb_readl(src++);
729                 if (c & 3) {
730                         u8 *dst8 = (u8 *) dst;
731                         u8 __iomem *src8 = (u8 __iomem *) src;
732
733                         for (i = c & 3; i--;)
734                                 *dst8++ = fb_readb(src8++);
735
736                         src = (u32 __iomem *) src8;
737                 }
738
739                 if (copy_to_user(buf, buffer, c)) {
740                         err = -EFAULT;
741                         break;
742                 }
743                 *ppos += c;
744                 buf += c;
745                 cnt += c;
746                 count -= c;
747         }
748
749         kfree(buffer);
750
751         return (err) ? err : cnt;
752 }
753
754 static ssize_t
755 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
756 {
757         unsigned long p = *ppos;
758         struct inode *inode = file->f_path.dentry->d_inode;
759         int fbidx = iminor(inode);
760         struct fb_info *info = registered_fb[fbidx];
761         u32 *buffer, *src;
762         u32 __iomem *dst;
763         int c, i, cnt = 0, err = 0;
764         unsigned long total_size;
765
766         if (!info || !info->screen_base)
767                 return -ENODEV;
768
769         if (info->state != FBINFO_STATE_RUNNING)
770                 return -EPERM;
771
772         if (info->fbops->fb_write)
773                 return info->fbops->fb_write(info, buf, count, ppos);
774         
775         total_size = info->screen_size;
776
777         if (total_size == 0)
778                 total_size = info->fix.smem_len;
779
780         if (p > total_size)
781                 return -EFBIG;
782
783         if (count > total_size) {
784                 err = -EFBIG;
785                 count = total_size;
786         }
787
788         if (count + p > total_size) {
789                 if (!err)
790                         err = -ENOSPC;
791
792                 count = total_size - p;
793         }
794
795         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
796                          GFP_KERNEL);
797         if (!buffer)
798                 return -ENOMEM;
799
800         dst = (u32 __iomem *) (info->screen_base + p);
801
802         if (info->fbops->fb_sync)
803                 info->fbops->fb_sync(info);
804
805         while (count) {
806                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
807                 src = buffer;
808
809                 if (copy_from_user(src, buf, c)) {
810                         err = -EFAULT;
811                         break;
812                 }
813
814                 for (i = c >> 2; i--; )
815                         fb_writel(*src++, dst++);
816
817                 if (c & 3) {
818                         u8 *src8 = (u8 *) src;
819                         u8 __iomem *dst8 = (u8 __iomem *) dst;
820
821                         for (i = c & 3; i--; )
822                                 fb_writeb(*src8++, dst8++);
823
824                         dst = (u32 __iomem *) dst8;
825                 }
826
827                 *ppos += c;
828                 buf += c;
829                 cnt += c;
830                 count -= c;
831         }
832
833         kfree(buffer);
834
835         return (cnt) ? cnt : err;
836 }
837
838 int
839 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
840 {
841         struct fb_fix_screeninfo *fix = &info->fix;
842         unsigned int yres = info->var.yres;
843         int err = 0;
844
845         if (var->yoffset > 0) {
846                 if (var->vmode & FB_VMODE_YWRAP) {
847                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
848                                 err = -EINVAL;
849                         else
850                                 yres = 0;
851                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
852                         err = -EINVAL;
853         }
854
855         if (var->xoffset > 0 && (!fix->xpanstep ||
856                                  (var->xoffset % fix->xpanstep)))
857                 err = -EINVAL;
858
859         if (err || !info->fbops->fb_pan_display ||
860             var->yoffset + yres > info->var.yres_virtual ||
861             var->xoffset + info->var.xres > info->var.xres_virtual)
862                 return -EINVAL;
863
864         if ((err = info->fbops->fb_pan_display(var, info)))
865                 return err;
866         info->var.xoffset = var->xoffset;
867         info->var.yoffset = var->yoffset;
868         if (var->vmode & FB_VMODE_YWRAP)
869                 info->var.vmode |= FB_VMODE_YWRAP;
870         else
871                 info->var.vmode &= ~FB_VMODE_YWRAP;
872         return 0;
873 }
874
875 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
876                          u32 activate)
877 {
878         struct fb_event event;
879         struct fb_blit_caps caps, fbcaps;
880         int err = 0;
881
882         memset(&caps, 0, sizeof(caps));
883         memset(&fbcaps, 0, sizeof(fbcaps));
884         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
885         event.info = info;
886         event.data = &caps;
887         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
888         info->fbops->fb_get_caps(info, &fbcaps, var);
889
890         if (((fbcaps.x ^ caps.x) & caps.x) ||
891             ((fbcaps.y ^ caps.y) & caps.y) ||
892             (fbcaps.len < caps.len))
893                 err = -EINVAL;
894
895         return err;
896 }
897
898 int
899 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
900 {
901         int flags = info->flags;
902         int ret = 0;
903
904         if (var->activate & FB_ACTIVATE_INV_MODE) {
905                 struct fb_videomode mode1, mode2;
906
907                 fb_var_to_videomode(&mode1, var);
908                 fb_var_to_videomode(&mode2, &info->var);
909                 /* make sure we don't delete the videomode of current var */
910                 ret = fb_mode_is_equal(&mode1, &mode2);
911
912                 if (!ret) {
913                     struct fb_event event;
914
915                     event.info = info;
916                     event.data = &mode1;
917                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
918                 }
919
920                 if (!ret)
921                     fb_delete_videomode(&mode1, &info->modelist);
922
923
924                 ret = (ret) ? -EINVAL : 0;
925                 goto done;
926         }
927
928         if ((var->activate & FB_ACTIVATE_FORCE) ||
929             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
930                 u32 activate = var->activate;
931
932                 if (!info->fbops->fb_check_var) {
933                         *var = info->var;
934                         goto done;
935                 }
936
937                 ret = info->fbops->fb_check_var(var, info);
938
939                 if (ret)
940                         goto done;
941
942                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
943                         struct fb_videomode mode;
944
945                         if (info->fbops->fb_get_caps) {
946                                 ret = fb_check_caps(info, var, activate);
947
948                                 if (ret)
949                                         goto done;
950                         }
951
952                         info->var = *var;
953
954                         if (info->fbops->fb_set_par)
955                                 info->fbops->fb_set_par(info);
956
957                         fb_pan_display(info, &info->var);
958                         fb_set_cmap(&info->cmap, info);
959                         fb_var_to_videomode(&mode, &info->var);
960
961                         if (info->modelist.prev && info->modelist.next &&
962                             !list_empty(&info->modelist))
963                                 ret = fb_add_videomode(&mode, &info->modelist);
964
965                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
966                                 struct fb_event event;
967                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
968                                         FB_EVENT_MODE_CHANGE_ALL :
969                                         FB_EVENT_MODE_CHANGE;
970
971                                 info->flags &= ~FBINFO_MISC_USEREVENT;
972                                 event.info = info;
973                                 event.data = &mode;
974                                 fb_notifier_call_chain(evnt, &event);
975                         }
976                 }
977         }
978
979  done:
980         return ret;
981 }
982
983 int
984 fb_blank(struct fb_info *info, int blank)
985 {       
986         int ret = -EINVAL;
987
988         if (blank > FB_BLANK_POWERDOWN)
989                 blank = FB_BLANK_POWERDOWN;
990
991         if (info->fbops->fb_blank)
992                 ret = info->fbops->fb_blank(blank, info);
993
994         if (!ret) {
995                 struct fb_event event;
996
997                 event.info = info;
998                 event.data = &blank;
999                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1000         }
1001
1002         return ret;
1003 }
1004
1005 static int 
1006 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1007          unsigned long arg)
1008 {
1009         int fbidx = iminor(inode);
1010         struct fb_info *info = registered_fb[fbidx];
1011         struct fb_ops *fb = info->fbops;
1012         struct fb_var_screeninfo var;
1013         struct fb_fix_screeninfo fix;
1014         struct fb_con2fbmap con2fb;
1015         struct fb_cmap_user cmap;
1016         struct fb_event event;
1017         void __user *argp = (void __user *)arg;
1018         int i;
1019         
1020         if (!fb)
1021                 return -ENODEV;
1022         switch (cmd) {
1023         case FBIOGET_VSCREENINFO:
1024                 return copy_to_user(argp, &info->var,
1025                                     sizeof(var)) ? -EFAULT : 0;
1026         case FBIOPUT_VSCREENINFO:
1027                 if (copy_from_user(&var, argp, sizeof(var)))
1028                         return -EFAULT;
1029                 acquire_console_sem();
1030                 info->flags |= FBINFO_MISC_USEREVENT;
1031                 i = fb_set_var(info, &var);
1032                 info->flags &= ~FBINFO_MISC_USEREVENT;
1033                 release_console_sem();
1034                 if (i) return i;
1035                 if (copy_to_user(argp, &var, sizeof(var)))
1036                         return -EFAULT;
1037                 return 0;
1038         case FBIOGET_FSCREENINFO:
1039                 return copy_to_user(argp, &info->fix,
1040                                     sizeof(fix)) ? -EFAULT : 0;
1041         case FBIOPUTCMAP:
1042                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1043                         return -EFAULT;
1044                 return (fb_set_user_cmap(&cmap, info));
1045         case FBIOGETCMAP:
1046                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1047                         return -EFAULT;
1048                 return fb_cmap_to_user(&info->cmap, &cmap);
1049         case FBIOPAN_DISPLAY:
1050                 if (copy_from_user(&var, argp, sizeof(var)))
1051                         return -EFAULT;
1052                 acquire_console_sem();
1053                 i = fb_pan_display(info, &var);
1054                 release_console_sem();
1055                 if (i)
1056                         return i;
1057                 if (copy_to_user(argp, &var, sizeof(var)))
1058                         return -EFAULT;
1059                 return 0;
1060         case FBIO_CURSOR:
1061                 return -EINVAL;
1062         case FBIOGET_CON2FBMAP:
1063                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1064                         return -EFAULT;
1065                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1066                     return -EINVAL;
1067                 con2fb.framebuffer = -1;
1068                 event.info = info;
1069                 event.data = &con2fb;
1070                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1071                 return copy_to_user(argp, &con2fb,
1072                                     sizeof(con2fb)) ? -EFAULT : 0;
1073         case FBIOPUT_CON2FBMAP:
1074                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1075                         return - EFAULT;
1076                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1077                     return -EINVAL;
1078                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1079                     return -EINVAL;
1080                 if (!registered_fb[con2fb.framebuffer])
1081                     request_module("fb%d", con2fb.framebuffer);
1082                 if (!registered_fb[con2fb.framebuffer])
1083                     return -EINVAL;
1084                 event.info = info;
1085                 event.data = &con2fb;
1086                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1087                                               &event);
1088         case FBIOBLANK:
1089                 acquire_console_sem();
1090                 info->flags |= FBINFO_MISC_USEREVENT;
1091                 i = fb_blank(info, arg);
1092                 info->flags &= ~FBINFO_MISC_USEREVENT;
1093                 release_console_sem();
1094                 return i;
1095         default:
1096                 if (fb->fb_ioctl == NULL)
1097                         return -EINVAL;
1098                 return fb->fb_ioctl(info, cmd, arg);
1099         }
1100 }
1101
1102 #ifdef CONFIG_COMPAT
1103 struct fb_fix_screeninfo32 {
1104         char                    id[16];
1105         compat_caddr_t          smem_start;
1106         u32                     smem_len;
1107         u32                     type;
1108         u32                     type_aux;
1109         u32                     visual;
1110         u16                     xpanstep;
1111         u16                     ypanstep;
1112         u16                     ywrapstep;
1113         u32                     line_length;
1114         compat_caddr_t          mmio_start;
1115         u32                     mmio_len;
1116         u32                     accel;
1117         u16                     reserved[3];
1118 };
1119
1120 struct fb_cmap32 {
1121         u32                     start;
1122         u32                     len;
1123         compat_caddr_t  red;
1124         compat_caddr_t  green;
1125         compat_caddr_t  blue;
1126         compat_caddr_t  transp;
1127 };
1128
1129 static int fb_getput_cmap(struct inode *inode, struct file *file,
1130                         unsigned int cmd, unsigned long arg)
1131 {
1132         struct fb_cmap_user __user *cmap;
1133         struct fb_cmap32 __user *cmap32;
1134         __u32 data;
1135         int err;
1136
1137         cmap = compat_alloc_user_space(sizeof(*cmap));
1138         cmap32 = compat_ptr(arg);
1139
1140         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1141                 return -EFAULT;
1142
1143         if (get_user(data, &cmap32->red) ||
1144             put_user(compat_ptr(data), &cmap->red) ||
1145             get_user(data, &cmap32->green) ||
1146             put_user(compat_ptr(data), &cmap->green) ||
1147             get_user(data, &cmap32->blue) ||
1148             put_user(compat_ptr(data), &cmap->blue) ||
1149             get_user(data, &cmap32->transp) ||
1150             put_user(compat_ptr(data), &cmap->transp))
1151                 return -EFAULT;
1152
1153         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1154
1155         if (!err) {
1156                 if (copy_in_user(&cmap32->start,
1157                                  &cmap->start,
1158                                  2 * sizeof(__u32)))
1159                         err = -EFAULT;
1160         }
1161         return err;
1162 }
1163
1164 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1165                                   struct fb_fix_screeninfo32 __user *fix32)
1166 {
1167         __u32 data;
1168         int err;
1169
1170         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1171
1172         data = (__u32) (unsigned long) fix->smem_start;
1173         err |= put_user(data, &fix32->smem_start);
1174
1175         err |= put_user(fix->smem_len, &fix32->smem_len);
1176         err |= put_user(fix->type, &fix32->type);
1177         err |= put_user(fix->type_aux, &fix32->type_aux);
1178         err |= put_user(fix->visual, &fix32->visual);
1179         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1180         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1181         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1182         err |= put_user(fix->line_length, &fix32->line_length);
1183
1184         data = (__u32) (unsigned long) fix->mmio_start;
1185         err |= put_user(data, &fix32->mmio_start);
1186
1187         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1188         err |= put_user(fix->accel, &fix32->accel);
1189         err |= copy_to_user(fix32->reserved, fix->reserved,
1190                             sizeof(fix->reserved));
1191
1192         return err;
1193 }
1194
1195 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1196                                 unsigned int cmd, unsigned long arg)
1197 {
1198         mm_segment_t old_fs;
1199         struct fb_fix_screeninfo fix;
1200         struct fb_fix_screeninfo32 __user *fix32;
1201         int err;
1202
1203         fix32 = compat_ptr(arg);
1204
1205         old_fs = get_fs();
1206         set_fs(KERNEL_DS);
1207         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1208         set_fs(old_fs);
1209
1210         if (!err)
1211                 err = do_fscreeninfo_to_user(&fix, fix32);
1212
1213         return err;
1214 }
1215
1216 static long
1217 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1218 {
1219         struct inode *inode = file->f_path.dentry->d_inode;
1220         int fbidx = iminor(inode);
1221         struct fb_info *info = registered_fb[fbidx];
1222         struct fb_ops *fb = info->fbops;
1223         long ret = -ENOIOCTLCMD;
1224
1225         lock_kernel();
1226         switch(cmd) {
1227         case FBIOGET_VSCREENINFO:
1228         case FBIOPUT_VSCREENINFO:
1229         case FBIOPAN_DISPLAY:
1230         case FBIOGET_CON2FBMAP:
1231         case FBIOPUT_CON2FBMAP:
1232                 arg = (unsigned long) compat_ptr(arg);
1233         case FBIOBLANK:
1234                 ret = fb_ioctl(inode, file, cmd, arg);
1235                 break;
1236
1237         case FBIOGET_FSCREENINFO:
1238                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1239                 break;
1240
1241         case FBIOGETCMAP:
1242         case FBIOPUTCMAP:
1243                 ret = fb_getput_cmap(inode, file, cmd, arg);
1244                 break;
1245
1246         default:
1247                 if (fb->fb_compat_ioctl)
1248                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1249                 break;
1250         }
1251         unlock_kernel();
1252         return ret;
1253 }
1254 #endif
1255
1256 static int
1257 fb_mmap(struct file *file, struct vm_area_struct * vma)
1258 {
1259         int fbidx = iminor(file->f_path.dentry->d_inode);
1260         struct fb_info *info = registered_fb[fbidx];
1261         struct fb_ops *fb = info->fbops;
1262         unsigned long off;
1263         unsigned long start;
1264         u32 len;
1265
1266         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1267                 return -EINVAL;
1268         off = vma->vm_pgoff << PAGE_SHIFT;
1269         if (!fb)
1270                 return -ENODEV;
1271         if (fb->fb_mmap) {
1272                 int res;
1273                 lock_kernel();
1274                 res = fb->fb_mmap(info, vma);
1275                 unlock_kernel();
1276                 return res;
1277         }
1278
1279         lock_kernel();
1280
1281         /* frame buffer memory */
1282         start = info->fix.smem_start;
1283         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1284         if (off >= len) {
1285                 /* memory mapped io */
1286                 off -= len;
1287                 if (info->var.accel_flags) {
1288                         unlock_kernel();
1289                         return -EINVAL;
1290                 }
1291                 start = info->fix.mmio_start;
1292                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1293         }
1294         unlock_kernel();
1295         start &= PAGE_MASK;
1296         if ((vma->vm_end - vma->vm_start + off) > len)
1297                 return -EINVAL;
1298         off += start;
1299         vma->vm_pgoff = off >> PAGE_SHIFT;
1300         /* This is an IO map - tell maydump to skip this VMA */
1301         vma->vm_flags |= VM_IO | VM_RESERVED;
1302         fb_pgprotect(file, vma, off);
1303         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1304                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1305                 return -EAGAIN;
1306         return 0;
1307 }
1308
1309 static int
1310 fb_open(struct inode *inode, struct file *file)
1311 {
1312         int fbidx = iminor(inode);
1313         struct fb_info *info;
1314         int res = 0;
1315
1316         if (fbidx >= FB_MAX)
1317                 return -ENODEV;
1318         lock_kernel();
1319         if (!(info = registered_fb[fbidx]))
1320                 request_module("fb%d", fbidx);
1321         if (!(info = registered_fb[fbidx])) {
1322                 res = -ENODEV;
1323                 goto out;
1324         }
1325         if (!try_module_get(info->fbops->owner)) {
1326                 res = -ENODEV;
1327                 goto out;
1328         }
1329         file->private_data = info;
1330         if (info->fbops->fb_open) {
1331                 res = info->fbops->fb_open(info,1);
1332                 if (res)
1333                         module_put(info->fbops->owner);
1334         }
1335 #ifdef CONFIG_FB_DEFERRED_IO
1336         if (info->fbdefio)
1337                 fb_deferred_io_open(info, inode, file);
1338 #endif
1339 out:
1340         unlock_kernel();
1341         return res;
1342 }
1343
1344 static int 
1345 fb_release(struct inode *inode, struct file *file)
1346 {
1347         struct fb_info * const info = file->private_data;
1348
1349         lock_kernel();
1350         if (info->fbops->fb_release)
1351                 info->fbops->fb_release(info,1);
1352         module_put(info->fbops->owner);
1353         unlock_kernel();
1354         return 0;
1355 }
1356
1357 static const struct file_operations fb_fops = {
1358         .owner =        THIS_MODULE,
1359         .read =         fb_read,
1360         .write =        fb_write,
1361         .ioctl =        fb_ioctl,
1362 #ifdef CONFIG_COMPAT
1363         .compat_ioctl = fb_compat_ioctl,
1364 #endif
1365         .mmap =         fb_mmap,
1366         .open =         fb_open,
1367         .release =      fb_release,
1368 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1369         .get_unmapped_area = get_fb_unmapped_area,
1370 #endif
1371 #ifdef CONFIG_FB_DEFERRED_IO
1372         .fsync =        fb_deferred_io_fsync,
1373 #endif
1374 };
1375
1376 struct class *fb_class;
1377 EXPORT_SYMBOL(fb_class);
1378
1379 static int fb_check_foreignness(struct fb_info *fi)
1380 {
1381         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1382
1383         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1384
1385 #ifdef __BIG_ENDIAN
1386         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1387 #else
1388         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1389 #endif /* __BIG_ENDIAN */
1390
1391         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1392                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1393                        "support this framebuffer\n", fi->fix.id);
1394                 return -ENOSYS;
1395         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1396                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1397                        "support this framebuffer\n", fi->fix.id);
1398                 return -ENOSYS;
1399         }
1400
1401         return 0;
1402 }
1403
1404 /**
1405  *      register_framebuffer - registers a frame buffer device
1406  *      @fb_info: frame buffer info structure
1407  *
1408  *      Registers a frame buffer device @fb_info.
1409  *
1410  *      Returns negative errno on error, or zero for success.
1411  *
1412  */
1413
1414 int
1415 register_framebuffer(struct fb_info *fb_info)
1416 {
1417         int i;
1418         struct fb_event event;
1419         struct fb_videomode mode;
1420
1421         if (num_registered_fb == FB_MAX)
1422                 return -ENXIO;
1423
1424         if (fb_check_foreignness(fb_info))
1425                 return -ENOSYS;
1426
1427         num_registered_fb++;
1428         for (i = 0 ; i < FB_MAX; i++)
1429                 if (!registered_fb[i])
1430                         break;
1431         fb_info->node = i;
1432
1433         fb_info->dev = device_create(fb_class, fb_info->device,
1434                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1435         if (IS_ERR(fb_info->dev)) {
1436                 /* Not fatal */
1437                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1438                 fb_info->dev = NULL;
1439         } else
1440                 fb_init_device(fb_info);
1441
1442         if (fb_info->pixmap.addr == NULL) {
1443                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1444                 if (fb_info->pixmap.addr) {
1445                         fb_info->pixmap.size = FBPIXMAPSIZE;
1446                         fb_info->pixmap.buf_align = 1;
1447                         fb_info->pixmap.scan_align = 1;
1448                         fb_info->pixmap.access_align = 32;
1449                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1450                 }
1451         }       
1452         fb_info->pixmap.offset = 0;
1453
1454         if (!fb_info->pixmap.blit_x)
1455                 fb_info->pixmap.blit_x = ~(u32)0;
1456
1457         if (!fb_info->pixmap.blit_y)
1458                 fb_info->pixmap.blit_y = ~(u32)0;
1459
1460         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1461                 INIT_LIST_HEAD(&fb_info->modelist);
1462
1463         fb_var_to_videomode(&mode, &fb_info->var);
1464         fb_add_videomode(&mode, &fb_info->modelist);
1465         registered_fb[i] = fb_info;
1466
1467         event.info = fb_info;
1468         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1469         return 0;
1470 }
1471
1472
1473 /**
1474  *      unregister_framebuffer - releases a frame buffer device
1475  *      @fb_info: frame buffer info structure
1476  *
1477  *      Unregisters a frame buffer device @fb_info.
1478  *
1479  *      Returns negative errno on error, or zero for success.
1480  *
1481  *      This function will also notify the framebuffer console
1482  *      to release the driver.
1483  *
1484  *      This is meant to be called within a driver's module_exit()
1485  *      function. If this is called outside module_exit(), ensure
1486  *      that the driver implements fb_open() and fb_release() to
1487  *      check that no processes are using the device.
1488  */
1489
1490 int
1491 unregister_framebuffer(struct fb_info *fb_info)
1492 {
1493         struct fb_event event;
1494         int i, ret = 0;
1495
1496         i = fb_info->node;
1497         if (!registered_fb[i]) {
1498                 ret = -EINVAL;
1499                 goto done;
1500         }
1501
1502         event.info = fb_info;
1503         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1504
1505         if (ret) {
1506                 ret = -EINVAL;
1507                 goto done;
1508         }
1509
1510         if (fb_info->pixmap.addr &&
1511             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1512                 kfree(fb_info->pixmap.addr);
1513         fb_destroy_modelist(&fb_info->modelist);
1514         registered_fb[i]=NULL;
1515         num_registered_fb--;
1516         fb_cleanup_device(fb_info);
1517         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1518         event.info = fb_info;
1519         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1520 done:
1521         return ret;
1522 }
1523
1524 /**
1525  *      fb_set_suspend - low level driver signals suspend
1526  *      @info: framebuffer affected
1527  *      @state: 0 = resuming, !=0 = suspending
1528  *
1529  *      This is meant to be used by low level drivers to
1530  *      signal suspend/resume to the core & clients.
1531  *      It must be called with the console semaphore held
1532  */
1533 void fb_set_suspend(struct fb_info *info, int state)
1534 {
1535         struct fb_event event;
1536
1537         event.info = info;
1538         if (state) {
1539                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1540                 info->state = FBINFO_STATE_SUSPENDED;
1541         } else {
1542                 info->state = FBINFO_STATE_RUNNING;
1543                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1544         }
1545 }
1546
1547 /**
1548  *      fbmem_init - init frame buffer subsystem
1549  *
1550  *      Initialize the frame buffer subsystem.
1551  *
1552  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1553  *
1554  */
1555
1556 static int __init
1557 fbmem_init(void)
1558 {
1559         proc_create("fb", 0, NULL, &fb_proc_fops);
1560
1561         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1562                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1563
1564         fb_class = class_create(THIS_MODULE, "graphics");
1565         if (IS_ERR(fb_class)) {
1566                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1567                 fb_class = NULL;
1568         }
1569         return 0;
1570 }
1571
1572 #ifdef MODULE
1573 module_init(fbmem_init);
1574 static void __exit
1575 fbmem_exit(void)
1576 {
1577         remove_proc_entry("fb", NULL);
1578         class_destroy(fb_class);
1579         unregister_chrdev(FB_MAJOR, "fb");
1580 }
1581
1582 module_exit(fbmem_exit);
1583 MODULE_LICENSE("GPL");
1584 MODULE_DESCRIPTION("Framebuffer base");
1585 #else
1586 subsys_initcall(fbmem_init);
1587 #endif
1588
1589 int fb_new_modelist(struct fb_info *info)
1590 {
1591         struct fb_event event;
1592         struct fb_var_screeninfo var = info->var;
1593         struct list_head *pos, *n;
1594         struct fb_modelist *modelist;
1595         struct fb_videomode *m, mode;
1596         int err = 1;
1597
1598         list_for_each_safe(pos, n, &info->modelist) {
1599                 modelist = list_entry(pos, struct fb_modelist, list);
1600                 m = &modelist->mode;
1601                 fb_videomode_to_var(&var, m);
1602                 var.activate = FB_ACTIVATE_TEST;
1603                 err = fb_set_var(info, &var);
1604                 fb_var_to_videomode(&mode, &var);
1605                 if (err || !fb_mode_is_equal(m, &mode)) {
1606                         list_del(pos);
1607                         kfree(pos);
1608                 }
1609         }
1610
1611         err = 1;
1612
1613         if (!list_empty(&info->modelist)) {
1614                 event.info = info;
1615                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1616         }
1617
1618         return err;
1619 }
1620
1621 static char *video_options[FB_MAX] __read_mostly;
1622 static int ofonly __read_mostly;
1623
1624 /**
1625  * fb_get_options - get kernel boot parameters
1626  * @name:   framebuffer name as it would appear in
1627  *          the boot parameter line
1628  *          (video=<name>:<options>)
1629  * @option: the option will be stored here
1630  *
1631  * NOTE: Needed to maintain backwards compatibility
1632  */
1633 int fb_get_options(char *name, char **option)
1634 {
1635         char *opt, *options = NULL;
1636         int opt_len, retval = 0;
1637         int name_len = strlen(name), i;
1638
1639         if (name_len && ofonly && strncmp(name, "offb", 4))
1640                 retval = 1;
1641
1642         if (name_len && !retval) {
1643                 for (i = 0; i < FB_MAX; i++) {
1644                         if (video_options[i] == NULL)
1645                                 continue;
1646                         opt_len = strlen(video_options[i]);
1647                         if (!opt_len)
1648                                 continue;
1649                         opt = video_options[i];
1650                         if (!strncmp(name, opt, name_len) &&
1651                             opt[name_len] == ':')
1652                                 options = opt + name_len + 1;
1653                 }
1654         }
1655         if (options && !strncmp(options, "off", 3))
1656                 retval = 1;
1657
1658         if (option)
1659                 *option = options;
1660
1661         return retval;
1662 }
1663
1664 #ifndef MODULE
1665 /**
1666  *      video_setup - process command line options
1667  *      @options: string of options
1668  *
1669  *      Process command line options for frame buffer subsystem.
1670  *
1671  *      NOTE: This function is a __setup and __init function.
1672  *            It only stores the options.  Drivers have to call
1673  *            fb_get_options() as necessary.
1674  *
1675  *      Returns zero.
1676  *
1677  */
1678 static int __init video_setup(char *options)
1679 {
1680         int i, global = 0;
1681
1682         if (!options || !*options)
1683                 global = 1;
1684
1685         if (!global && !strncmp(options, "ofonly", 6)) {
1686                 ofonly = 1;
1687                 global = 1;
1688         }
1689
1690         if (!global && !strstr(options, "fb:")) {
1691                 fb_mode_option = options;
1692                 global = 1;
1693         }
1694
1695         if (!global) {
1696                 for (i = 0; i < FB_MAX; i++) {
1697                         if (video_options[i] == NULL) {
1698                                 video_options[i] = options;
1699                                 break;
1700                         }
1701
1702                 }
1703         }
1704
1705         return 1;
1706 }
1707 __setup("video=", video_setup);
1708 #endif
1709
1710     /*
1711      *  Visible symbols for modules
1712      */
1713
1714 EXPORT_SYMBOL(register_framebuffer);
1715 EXPORT_SYMBOL(unregister_framebuffer);
1716 EXPORT_SYMBOL(num_registered_fb);
1717 EXPORT_SYMBOL(registered_fb);
1718 EXPORT_SYMBOL(fb_show_logo);
1719 EXPORT_SYMBOL(fb_set_var);
1720 EXPORT_SYMBOL(fb_blank);
1721 EXPORT_SYMBOL(fb_pan_display);
1722 EXPORT_SYMBOL(fb_get_buffer_offset);
1723 EXPORT_SYMBOL(fb_set_suspend);
1724 EXPORT_SYMBOL(fb_get_options);
1725
1726 MODULE_LICENSE("GPL");