Merge git://git.infradead.org/mtd-2.6
[linux-2.6] / drivers / video / fbmem.c
1 /*
2  *  linux/drivers/video/fbmem.c
3  *
4  *  Copyright (C) 1994 Martin Schaller
5  *
6  *      2001 - Documented with DocBook
7  *      - Brad Douglas <brad@neruo.com>
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive
11  * for more details.
12  */
13
14 #include <linux/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 #ifdef CONFIG_KMOD
32 #include <linux/kmod.h>
33 #endif
34 #include <linux/err.h>
35 #include <linux/device.h>
36 #include <linux/efi.h>
37 #include <linux/fb.h>
38
39 #include <asm/fb.h>
40
41
42     /*
43      *  Frame buffer device initialization and setup routines
44      */
45
46 #define FBPIXMAPSIZE    (1024 * 8)
47
48 struct fb_info *registered_fb[FB_MAX] __read_mostly;
49 int num_registered_fb __read_mostly;
50
51 /*
52  * Helpers
53  */
54
55 int fb_get_color_depth(struct fb_var_screeninfo *var,
56                        struct fb_fix_screeninfo *fix)
57 {
58         int depth = 0;
59
60         if (fix->visual == FB_VISUAL_MONO01 ||
61             fix->visual == FB_VISUAL_MONO10)
62                 depth = 1;
63         else {
64                 if (var->green.length == var->blue.length &&
65                     var->green.length == var->red.length &&
66                     var->green.offset == var->blue.offset &&
67                     var->green.offset == var->red.offset)
68                         depth = var->green.length;
69                 else
70                         depth = var->green.length + var->red.length +
71                                 var->blue.length;
72         }
73
74         return depth;
75 }
76 EXPORT_SYMBOL(fb_get_color_depth);
77
78 /*
79  * Data padding functions.
80  */
81 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
82 {
83         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
84 }
85 EXPORT_SYMBOL(fb_pad_aligned_buffer);
86
87 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
88                                 u32 shift_high, u32 shift_low, u32 mod)
89 {
90         u8 mask = (u8) (0xfff << shift_high), tmp;
91         int i, j;
92
93         for (i = height; i--; ) {
94                 for (j = 0; j < idx; j++) {
95                         tmp = dst[j];
96                         tmp &= mask;
97                         tmp |= *src >> shift_low;
98                         dst[j] = tmp;
99                         tmp = *src << shift_high;
100                         dst[j+1] = tmp;
101                         src++;
102                 }
103                 tmp = dst[idx];
104                 tmp &= mask;
105                 tmp |= *src >> shift_low;
106                 dst[idx] = tmp;
107                 if (shift_high < mod) {
108                         tmp = *src << shift_high;
109                         dst[idx+1] = tmp;
110                 }
111                 src++;
112                 dst += d_pitch;
113         }
114 }
115 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
116
117 /*
118  * we need to lock this section since fb_cursor
119  * may use fb_imageblit()
120  */
121 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
122 {
123         u32 align = buf->buf_align - 1, offset;
124         char *addr = buf->addr;
125
126         /* If IO mapped, we need to sync before access, no sharing of
127          * the pixmap is done
128          */
129         if (buf->flags & FB_PIXMAP_IO) {
130                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
131                         info->fbops->fb_sync(info);
132                 return addr;
133         }
134
135         /* See if we fit in the remaining pixmap space */
136         offset = buf->offset + align;
137         offset &= ~align;
138         if (offset + size > buf->size) {
139                 /* We do not fit. In order to be able to re-use the buffer,
140                  * we must ensure no asynchronous DMA'ing or whatever operation
141                  * is in progress, we sync for that.
142                  */
143                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
144                         info->fbops->fb_sync(info);
145                 offset = 0;
146         }
147         buf->offset = offset + size;
148         addr += offset;
149
150         return addr;
151 }
152
153 #ifdef CONFIG_LOGO
154
155 static inline unsigned safe_shift(unsigned d, int n)
156 {
157         return n < 0 ? d >> -n : d << n;
158 }
159
160 static void fb_set_logocmap(struct fb_info *info,
161                                    const struct linux_logo *logo)
162 {
163         struct fb_cmap palette_cmap;
164         u16 palette_green[16];
165         u16 palette_blue[16];
166         u16 palette_red[16];
167         int i, j, n;
168         const unsigned char *clut = logo->clut;
169
170         palette_cmap.start = 0;
171         palette_cmap.len = 16;
172         palette_cmap.red = palette_red;
173         palette_cmap.green = palette_green;
174         palette_cmap.blue = palette_blue;
175         palette_cmap.transp = NULL;
176
177         for (i = 0; i < logo->clutsize; i += n) {
178                 n = logo->clutsize - i;
179                 /* palette_cmap provides space for only 16 colors at once */
180                 if (n > 16)
181                         n = 16;
182                 palette_cmap.start = 32 + i;
183                 palette_cmap.len = n;
184                 for (j = 0; j < n; ++j) {
185                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
186                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
187                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
188                         clut += 3;
189                 }
190                 fb_set_cmap(&palette_cmap, info);
191         }
192 }
193
194 static void  fb_set_logo_truepalette(struct fb_info *info,
195                                             const struct linux_logo *logo,
196                                             u32 *palette)
197 {
198         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
199         unsigned char redmask, greenmask, bluemask;
200         int redshift, greenshift, blueshift;
201         int i;
202         const unsigned char *clut = logo->clut;
203
204         /*
205          * We have to create a temporary palette since console palette is only
206          * 16 colors long.
207          */
208         /* Bug: Doesn't obey msb_right ... (who needs that?) */
209         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
210         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
211         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
212         redshift   = info->var.red.offset   - (8 - info->var.red.length);
213         greenshift = info->var.green.offset - (8 - info->var.green.length);
214         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
215
216         for ( i = 0; i < logo->clutsize; i++) {
217                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
218                                  safe_shift((clut[1] & greenmask), greenshift) |
219                                  safe_shift((clut[2] & bluemask), blueshift));
220                 clut += 3;
221         }
222 }
223
224 static void fb_set_logo_directpalette(struct fb_info *info,
225                                              const struct linux_logo *logo,
226                                              u32 *palette)
227 {
228         int redshift, greenshift, blueshift;
229         int i;
230
231         redshift = info->var.red.offset;
232         greenshift = info->var.green.offset;
233         blueshift = info->var.blue.offset;
234
235         for (i = 32; i < logo->clutsize; i++)
236                 palette[i] = i << redshift | i << greenshift | i << blueshift;
237 }
238
239 static void fb_set_logo(struct fb_info *info,
240                                const struct linux_logo *logo, u8 *dst,
241                                int depth)
242 {
243         int i, j, k;
244         const u8 *src = logo->data;
245         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
246         u8 fg = 1, d;
247
248         switch (fb_get_color_depth(&info->var, &info->fix)) {
249         case 1:
250                 fg = 1;
251                 break;
252         case 2:
253                 fg = 3;
254                 break;
255         default:
256                 fg = 7;
257                 break;
258         }
259
260         if (info->fix.visual == FB_VISUAL_MONO01 ||
261             info->fix.visual == FB_VISUAL_MONO10)
262                 fg = ~((u8) (0xfff << info->var.green.length));
263
264         switch (depth) {
265         case 4:
266                 for (i = 0; i < logo->height; i++)
267                         for (j = 0; j < logo->width; src++) {
268                                 *dst++ = *src >> 4;
269                                 j++;
270                                 if (j < logo->width) {
271                                         *dst++ = *src & 0x0f;
272                                         j++;
273                                 }
274                         }
275                 break;
276         case 1:
277                 for (i = 0; i < logo->height; i++) {
278                         for (j = 0; j < logo->width; src++) {
279                                 d = *src ^ xor;
280                                 for (k = 7; k >= 0; k--) {
281                                         *dst++ = ((d >> k) & 1) ? fg : 0;
282                                         j++;
283                                 }
284                         }
285                 }
286                 break;
287         }
288 }
289
290 /*
291  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
292  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
293  * the visual format and color depth of the framebuffer, the DAC, the
294  * pseudo_palette, and the logo data will be adjusted accordingly.
295  *
296  * Case 1 - linux_logo_clut224:
297  * Color exceeds the number of console colors (16), thus we set the hardware DAC
298  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
299  *
300  * For visuals that require color info from the pseudo_palette, we also construct
301  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
302  * will be set.
303  *
304  * Case 2 - linux_logo_vga16:
305  * The number of colors just matches the console colors, thus there is no need
306  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
307  * each byte contains color information for two pixels (upper and lower nibble).
308  * To be consistent with fb_imageblit() usage, we therefore separate the two
309  * nibbles into separate bytes. The "depth" flag will be set to 4.
310  *
311  * Case 3 - linux_logo_mono:
312  * This is similar with Case 2.  Each byte contains information for 8 pixels.
313  * We isolate each bit and expand each into a byte. The "depth" flag will
314  * be set to 1.
315  */
316 static struct logo_data {
317         int depth;
318         int needs_directpalette;
319         int needs_truepalette;
320         int needs_cmapreset;
321         const struct linux_logo *logo;
322 } fb_logo __read_mostly;
323
324 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
325 {
326         u32 size = width * height, i;
327
328         out += size - 1;
329
330         for (i = size; i--; )
331                 *out-- = *in++;
332 }
333
334 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
335 {
336         int i, j, h = height - 1;
337
338         for (i = 0; i < height; i++)
339                 for (j = 0; j < width; j++)
340                                 out[height * j + h - i] = *in++;
341 }
342
343 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
344 {
345         int i, j, w = width - 1;
346
347         for (i = 0; i < height; i++)
348                 for (j = 0; j < width; j++)
349                         out[height * (w - j) + i] = *in++;
350 }
351
352 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
353                            struct fb_image *image, int rotate)
354 {
355         u32 tmp;
356
357         if (rotate == FB_ROTATE_UD) {
358                 fb_rotate_logo_ud(image->data, dst, image->width,
359                                   image->height);
360                 image->dx = info->var.xres - image->width - image->dx;
361                 image->dy = info->var.yres - image->height - image->dy;
362         } else if (rotate == FB_ROTATE_CW) {
363                 fb_rotate_logo_cw(image->data, dst, image->width,
364                                   image->height);
365                 tmp = image->width;
366                 image->width = image->height;
367                 image->height = tmp;
368                 tmp = image->dy;
369                 image->dy = image->dx;
370                 image->dx = info->var.xres - image->width - tmp;
371         } else if (rotate == FB_ROTATE_CCW) {
372                 fb_rotate_logo_ccw(image->data, dst, image->width,
373                                    image->height);
374                 tmp = image->width;
375                 image->width = image->height;
376                 image->height = tmp;
377                 tmp = image->dx;
378                 image->dx = image->dy;
379                 image->dy = info->var.yres - image->height - tmp;
380         }
381
382         image->data = dst;
383 }
384
385 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
386                             int rotate, unsigned int num)
387 {
388         unsigned int x;
389
390         if (rotate == FB_ROTATE_UR) {
391                 for (x = 0;
392                      x < num && image->dx + image->width <= info->var.xres;
393                      x++) {
394                         info->fbops->fb_imageblit(info, image);
395                         image->dx += image->width + 8;
396                 }
397         } else if (rotate == FB_ROTATE_UD) {
398                 for (x = 0; x < num && image->dx >= 0; x++) {
399                         info->fbops->fb_imageblit(info, image);
400                         image->dx -= image->width + 8;
401                 }
402         } else if (rotate == FB_ROTATE_CW) {
403                 for (x = 0;
404                      x < num && image->dy + image->height <= info->var.yres;
405                      x++) {
406                         info->fbops->fb_imageblit(info, image);
407                         image->dy += image->height + 8;
408                 }
409         } else if (rotate == FB_ROTATE_CCW) {
410                 for (x = 0; x < num && image->dy >= 0; x++) {
411                         info->fbops->fb_imageblit(info, image);
412                         image->dy -= image->height + 8;
413                 }
414         }
415 }
416
417 static int fb_show_logo_line(struct fb_info *info, int rotate,
418                              const struct linux_logo *logo, int y,
419                              unsigned int n)
420 {
421         u32 *palette = NULL, *saved_pseudo_palette = NULL;
422         unsigned char *logo_new = NULL, *logo_rotate = NULL;
423         struct fb_image image;
424
425         /* Return if the frame buffer is not mapped or suspended */
426         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
427             info->flags & FBINFO_MODULE)
428                 return 0;
429
430         image.depth = 8;
431         image.data = logo->data;
432
433         if (fb_logo.needs_cmapreset)
434                 fb_set_logocmap(info, logo);
435
436         if (fb_logo.needs_truepalette ||
437             fb_logo.needs_directpalette) {
438                 palette = kmalloc(256 * 4, GFP_KERNEL);
439                 if (palette == NULL)
440                         return 0;
441
442                 if (fb_logo.needs_truepalette)
443                         fb_set_logo_truepalette(info, logo, palette);
444                 else
445                         fb_set_logo_directpalette(info, logo, palette);
446
447                 saved_pseudo_palette = info->pseudo_palette;
448                 info->pseudo_palette = palette;
449         }
450
451         if (fb_logo.depth <= 4) {
452                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
453                 if (logo_new == NULL) {
454                         kfree(palette);
455                         if (saved_pseudo_palette)
456                                 info->pseudo_palette = saved_pseudo_palette;
457                         return 0;
458                 }
459                 image.data = logo_new;
460                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
461         }
462
463         image.dx = 0;
464         image.dy = y;
465         image.width = logo->width;
466         image.height = logo->height;
467
468         if (rotate) {
469                 logo_rotate = kmalloc(logo->width *
470                                       logo->height, GFP_KERNEL);
471                 if (logo_rotate)
472                         fb_rotate_logo(info, logo_rotate, &image, rotate);
473         }
474
475         fb_do_show_logo(info, &image, rotate, n);
476
477         kfree(palette);
478         if (saved_pseudo_palette != NULL)
479                 info->pseudo_palette = saved_pseudo_palette;
480         kfree(logo_new);
481         kfree(logo_rotate);
482         return logo->height;
483 }
484
485
486 #ifdef CONFIG_FB_LOGO_EXTRA
487
488 #define FB_LOGO_EX_NUM_MAX 10
489 static struct logo_data_extra {
490         const struct linux_logo *logo;
491         unsigned int n;
492 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
493 static unsigned int fb_logo_ex_num;
494
495 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
496 {
497         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
498                 return;
499
500         fb_logo_ex[fb_logo_ex_num].logo = logo;
501         fb_logo_ex[fb_logo_ex_num].n = n;
502         fb_logo_ex_num++;
503 }
504
505 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
506                                   unsigned int yres)
507 {
508         unsigned int i;
509
510         /* FIXME: logo_ex supports only truecolor fb. */
511         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
512                 fb_logo_ex_num = 0;
513
514         for (i = 0; i < fb_logo_ex_num; i++) {
515                 height += fb_logo_ex[i].logo->height;
516                 if (height > yres) {
517                         height -= fb_logo_ex[i].logo->height;
518                         fb_logo_ex_num = i;
519                         break;
520                 }
521         }
522         return height;
523 }
524
525 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
526 {
527         unsigned int i;
528
529         for (i = 0; i < fb_logo_ex_num; i++)
530                 y += fb_show_logo_line(info, rotate,
531                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
532
533         return y;
534 }
535
536 #else /* !CONFIG_FB_LOGO_EXTRA */
537
538 static inline int fb_prepare_extra_logos(struct fb_info *info,
539                                          unsigned int height,
540                                          unsigned int yres)
541 {
542         return height;
543 }
544
545 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
546 {
547         return y;
548 }
549
550 #endif /* CONFIG_FB_LOGO_EXTRA */
551
552
553 int fb_prepare_logo(struct fb_info *info, int rotate)
554 {
555         int depth = fb_get_color_depth(&info->var, &info->fix);
556         unsigned int yres;
557
558         memset(&fb_logo, 0, sizeof(struct logo_data));
559
560         if (info->flags & FBINFO_MISC_TILEBLITTING ||
561             info->flags & FBINFO_MODULE)
562                 return 0;
563
564         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
565                 depth = info->var.blue.length;
566                 if (info->var.red.length < depth)
567                         depth = info->var.red.length;
568                 if (info->var.green.length < depth)
569                         depth = info->var.green.length;
570         }
571
572         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
573                 /* assume console colormap */
574                 depth = 4;
575         }
576
577         /* Return if no suitable logo was found */
578         fb_logo.logo = fb_find_logo(depth);
579
580         if (!fb_logo.logo) {
581                 return 0;
582         }
583
584         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
585                 yres = info->var.yres;
586         else
587                 yres = info->var.xres;
588
589         if (fb_logo.logo->height > yres) {
590                 fb_logo.logo = NULL;
591                 return 0;
592         }
593
594         /* What depth we asked for might be different from what we get */
595         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
596                 fb_logo.depth = 8;
597         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
598                 fb_logo.depth = 4;
599         else
600                 fb_logo.depth = 1;
601
602
603         if (fb_logo.depth > 4 && depth > 4) {
604                 switch (info->fix.visual) {
605                 case FB_VISUAL_TRUECOLOR:
606                         fb_logo.needs_truepalette = 1;
607                         break;
608                 case FB_VISUAL_DIRECTCOLOR:
609                         fb_logo.needs_directpalette = 1;
610                         fb_logo.needs_cmapreset = 1;
611                         break;
612                 case FB_VISUAL_PSEUDOCOLOR:
613                         fb_logo.needs_cmapreset = 1;
614                         break;
615                 }
616         }
617
618         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
619 }
620
621 int fb_show_logo(struct fb_info *info, int rotate)
622 {
623         int y;
624
625         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
626                               num_online_cpus());
627         y = fb_show_extra_logos(info, y, rotate);
628
629         return y;
630 }
631 #else
632 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
633 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
634 #endif /* CONFIG_LOGO */
635
636 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
637 {
638         return (*pos < FB_MAX) ? pos : NULL;
639 }
640
641 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
642 {
643         (*pos)++;
644         return (*pos < FB_MAX) ? pos : NULL;
645 }
646
647 static void fb_seq_stop(struct seq_file *m, void *v)
648 {
649 }
650
651 static int fb_seq_show(struct seq_file *m, void *v)
652 {
653         int i = *(loff_t *)v;
654         struct fb_info *fi = registered_fb[i];
655
656         if (fi)
657                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
658         return 0;
659 }
660
661 static const struct seq_operations proc_fb_seq_ops = {
662         .start  = fb_seq_start,
663         .next   = fb_seq_next,
664         .stop   = fb_seq_stop,
665         .show   = fb_seq_show,
666 };
667
668 static int proc_fb_open(struct inode *inode, struct file *file)
669 {
670         return seq_open(file, &proc_fb_seq_ops);
671 }
672
673 static const struct file_operations fb_proc_fops = {
674         .owner          = THIS_MODULE,
675         .open           = proc_fb_open,
676         .read           = seq_read,
677         .llseek         = seq_lseek,
678         .release        = seq_release,
679 };
680
681 static ssize_t
682 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
683 {
684         unsigned long p = *ppos;
685         struct inode *inode = file->f_path.dentry->d_inode;
686         int fbidx = iminor(inode);
687         struct fb_info *info = registered_fb[fbidx];
688         u32 *buffer, *dst;
689         u32 __iomem *src;
690         int c, i, cnt = 0, err = 0;
691         unsigned long total_size;
692
693         if (!info || ! info->screen_base)
694                 return -ENODEV;
695
696         if (info->state != FBINFO_STATE_RUNNING)
697                 return -EPERM;
698
699         if (info->fbops->fb_read)
700                 return info->fbops->fb_read(info, buf, count, ppos);
701         
702         total_size = info->screen_size;
703
704         if (total_size == 0)
705                 total_size = info->fix.smem_len;
706
707         if (p >= total_size)
708                 return 0;
709
710         if (count >= total_size)
711                 count = total_size;
712
713         if (count + p > total_size)
714                 count = total_size - p;
715
716         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
717                          GFP_KERNEL);
718         if (!buffer)
719                 return -ENOMEM;
720
721         src = (u32 __iomem *) (info->screen_base + p);
722
723         if (info->fbops->fb_sync)
724                 info->fbops->fb_sync(info);
725
726         while (count) {
727                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
728                 dst = buffer;
729                 for (i = c >> 2; i--; )
730                         *dst++ = fb_readl(src++);
731                 if (c & 3) {
732                         u8 *dst8 = (u8 *) dst;
733                         u8 __iomem *src8 = (u8 __iomem *) src;
734
735                         for (i = c & 3; i--;)
736                                 *dst8++ = fb_readb(src8++);
737
738                         src = (u32 __iomem *) src8;
739                 }
740
741                 if (copy_to_user(buf, buffer, c)) {
742                         err = -EFAULT;
743                         break;
744                 }
745                 *ppos += c;
746                 buf += c;
747                 cnt += c;
748                 count -= c;
749         }
750
751         kfree(buffer);
752
753         return (err) ? err : cnt;
754 }
755
756 static ssize_t
757 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
758 {
759         unsigned long p = *ppos;
760         struct inode *inode = file->f_path.dentry->d_inode;
761         int fbidx = iminor(inode);
762         struct fb_info *info = registered_fb[fbidx];
763         u32 *buffer, *src;
764         u32 __iomem *dst;
765         int c, i, cnt = 0, err = 0;
766         unsigned long total_size;
767
768         if (!info || !info->screen_base)
769                 return -ENODEV;
770
771         if (info->state != FBINFO_STATE_RUNNING)
772                 return -EPERM;
773
774         if (info->fbops->fb_write)
775                 return info->fbops->fb_write(info, buf, count, ppos);
776         
777         total_size = info->screen_size;
778
779         if (total_size == 0)
780                 total_size = info->fix.smem_len;
781
782         if (p > total_size)
783                 return -EFBIG;
784
785         if (count > total_size) {
786                 err = -EFBIG;
787                 count = total_size;
788         }
789
790         if (count + p > total_size) {
791                 if (!err)
792                         err = -ENOSPC;
793
794                 count = total_size - p;
795         }
796
797         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
798                          GFP_KERNEL);
799         if (!buffer)
800                 return -ENOMEM;
801
802         dst = (u32 __iomem *) (info->screen_base + p);
803
804         if (info->fbops->fb_sync)
805                 info->fbops->fb_sync(info);
806
807         while (count) {
808                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
809                 src = buffer;
810
811                 if (copy_from_user(src, buf, c)) {
812                         err = -EFAULT;
813                         break;
814                 }
815
816                 for (i = c >> 2; i--; )
817                         fb_writel(*src++, dst++);
818
819                 if (c & 3) {
820                         u8 *src8 = (u8 *) src;
821                         u8 __iomem *dst8 = (u8 __iomem *) dst;
822
823                         for (i = c & 3; i--; )
824                                 fb_writeb(*src8++, dst8++);
825
826                         dst = (u32 __iomem *) dst8;
827                 }
828
829                 *ppos += c;
830                 buf += c;
831                 cnt += c;
832                 count -= c;
833         }
834
835         kfree(buffer);
836
837         return (cnt) ? cnt : err;
838 }
839
840 #ifdef CONFIG_KMOD
841 static void try_to_load(int fb)
842 {
843         request_module("fb%d", fb);
844 }
845 #endif /* CONFIG_KMOD */
846
847 int
848 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
849 {
850         struct fb_fix_screeninfo *fix = &info->fix;
851         unsigned int yres = info->var.yres;
852         int err = 0;
853
854         if (var->yoffset > 0) {
855                 if (var->vmode & FB_VMODE_YWRAP) {
856                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
857                                 err = -EINVAL;
858                         else
859                                 yres = 0;
860                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
861                         err = -EINVAL;
862         }
863
864         if (var->xoffset > 0 && (!fix->xpanstep ||
865                                  (var->xoffset % fix->xpanstep)))
866                 err = -EINVAL;
867
868         if (err || !info->fbops->fb_pan_display ||
869             var->yoffset + yres > info->var.yres_virtual ||
870             var->xoffset + info->var.xres > info->var.xres_virtual)
871                 return -EINVAL;
872
873         if ((err = info->fbops->fb_pan_display(var, info)))
874                 return err;
875         info->var.xoffset = var->xoffset;
876         info->var.yoffset = var->yoffset;
877         if (var->vmode & FB_VMODE_YWRAP)
878                 info->var.vmode |= FB_VMODE_YWRAP;
879         else
880                 info->var.vmode &= ~FB_VMODE_YWRAP;
881         return 0;
882 }
883
884 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
885                          u32 activate)
886 {
887         struct fb_event event;
888         struct fb_blit_caps caps, fbcaps;
889         int err = 0;
890
891         memset(&caps, 0, sizeof(caps));
892         memset(&fbcaps, 0, sizeof(fbcaps));
893         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
894         event.info = info;
895         event.data = &caps;
896         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
897         info->fbops->fb_get_caps(info, &fbcaps, var);
898
899         if (((fbcaps.x ^ caps.x) & caps.x) ||
900             ((fbcaps.y ^ caps.y) & caps.y) ||
901             (fbcaps.len < caps.len))
902                 err = -EINVAL;
903
904         return err;
905 }
906
907 int
908 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
909 {
910         int flags = info->flags;
911         int ret = 0;
912
913         if (var->activate & FB_ACTIVATE_INV_MODE) {
914                 struct fb_videomode mode1, mode2;
915
916                 fb_var_to_videomode(&mode1, var);
917                 fb_var_to_videomode(&mode2, &info->var);
918                 /* make sure we don't delete the videomode of current var */
919                 ret = fb_mode_is_equal(&mode1, &mode2);
920
921                 if (!ret) {
922                     struct fb_event event;
923
924                     event.info = info;
925                     event.data = &mode1;
926                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
927                 }
928
929                 if (!ret)
930                     fb_delete_videomode(&mode1, &info->modelist);
931
932
933                 ret = (ret) ? -EINVAL : 0;
934                 goto done;
935         }
936
937         if ((var->activate & FB_ACTIVATE_FORCE) ||
938             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
939                 u32 activate = var->activate;
940
941                 if (!info->fbops->fb_check_var) {
942                         *var = info->var;
943                         goto done;
944                 }
945
946                 ret = info->fbops->fb_check_var(var, info);
947
948                 if (ret)
949                         goto done;
950
951                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
952                         struct fb_videomode mode;
953
954                         if (info->fbops->fb_get_caps) {
955                                 ret = fb_check_caps(info, var, activate);
956
957                                 if (ret)
958                                         goto done;
959                         }
960
961                         info->var = *var;
962
963                         if (info->fbops->fb_set_par)
964                                 info->fbops->fb_set_par(info);
965
966                         fb_pan_display(info, &info->var);
967                         fb_set_cmap(&info->cmap, info);
968                         fb_var_to_videomode(&mode, &info->var);
969
970                         if (info->modelist.prev && info->modelist.next &&
971                             !list_empty(&info->modelist))
972                                 ret = fb_add_videomode(&mode, &info->modelist);
973
974                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
975                                 struct fb_event event;
976                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
977                                         FB_EVENT_MODE_CHANGE_ALL :
978                                         FB_EVENT_MODE_CHANGE;
979
980                                 info->flags &= ~FBINFO_MISC_USEREVENT;
981                                 event.info = info;
982                                 fb_notifier_call_chain(evnt, &event);
983                         }
984                 }
985         }
986
987  done:
988         return ret;
989 }
990
991 int
992 fb_blank(struct fb_info *info, int blank)
993 {       
994         int ret = -EINVAL;
995
996         if (blank > FB_BLANK_POWERDOWN)
997                 blank = FB_BLANK_POWERDOWN;
998
999         if (info->fbops->fb_blank)
1000                 ret = info->fbops->fb_blank(blank, info);
1001
1002         if (!ret) {
1003                 struct fb_event event;
1004
1005                 event.info = info;
1006                 event.data = &blank;
1007                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1008         }
1009
1010         return ret;
1011 }
1012
1013 static int 
1014 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1015          unsigned long arg)
1016 {
1017         int fbidx = iminor(inode);
1018         struct fb_info *info = registered_fb[fbidx];
1019         struct fb_ops *fb = info->fbops;
1020         struct fb_var_screeninfo var;
1021         struct fb_fix_screeninfo fix;
1022         struct fb_con2fbmap con2fb;
1023         struct fb_cmap_user cmap;
1024         struct fb_event event;
1025         void __user *argp = (void __user *)arg;
1026         int i;
1027         
1028         if (!fb)
1029                 return -ENODEV;
1030         switch (cmd) {
1031         case FBIOGET_VSCREENINFO:
1032                 return copy_to_user(argp, &info->var,
1033                                     sizeof(var)) ? -EFAULT : 0;
1034         case FBIOPUT_VSCREENINFO:
1035                 if (copy_from_user(&var, argp, sizeof(var)))
1036                         return -EFAULT;
1037                 acquire_console_sem();
1038                 info->flags |= FBINFO_MISC_USEREVENT;
1039                 i = fb_set_var(info, &var);
1040                 info->flags &= ~FBINFO_MISC_USEREVENT;
1041                 release_console_sem();
1042                 if (i) return i;
1043                 if (copy_to_user(argp, &var, sizeof(var)))
1044                         return -EFAULT;
1045                 return 0;
1046         case FBIOGET_FSCREENINFO:
1047                 return copy_to_user(argp, &info->fix,
1048                                     sizeof(fix)) ? -EFAULT : 0;
1049         case FBIOPUTCMAP:
1050                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1051                         return -EFAULT;
1052                 return (fb_set_user_cmap(&cmap, info));
1053         case FBIOGETCMAP:
1054                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1055                         return -EFAULT;
1056                 return fb_cmap_to_user(&info->cmap, &cmap);
1057         case FBIOPAN_DISPLAY:
1058                 if (copy_from_user(&var, argp, sizeof(var)))
1059                         return -EFAULT;
1060                 acquire_console_sem();
1061                 i = fb_pan_display(info, &var);
1062                 release_console_sem();
1063                 if (i)
1064                         return i;
1065                 if (copy_to_user(argp, &var, sizeof(var)))
1066                         return -EFAULT;
1067                 return 0;
1068         case FBIO_CURSOR:
1069                 return -EINVAL;
1070         case FBIOGET_CON2FBMAP:
1071                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1072                         return -EFAULT;
1073                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1074                     return -EINVAL;
1075                 con2fb.framebuffer = -1;
1076                 event.info = info;
1077                 event.data = &con2fb;
1078                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1079                 return copy_to_user(argp, &con2fb,
1080                                     sizeof(con2fb)) ? -EFAULT : 0;
1081         case FBIOPUT_CON2FBMAP:
1082                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1083                         return - EFAULT;
1084                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1085                     return -EINVAL;
1086                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1087                     return -EINVAL;
1088 #ifdef CONFIG_KMOD
1089                 if (!registered_fb[con2fb.framebuffer])
1090                     try_to_load(con2fb.framebuffer);
1091 #endif /* CONFIG_KMOD */
1092                 if (!registered_fb[con2fb.framebuffer])
1093                     return -EINVAL;
1094                 event.info = info;
1095                 event.data = &con2fb;
1096                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1097                                               &event);
1098         case FBIOBLANK:
1099                 acquire_console_sem();
1100                 info->flags |= FBINFO_MISC_USEREVENT;
1101                 i = fb_blank(info, arg);
1102                 info->flags &= ~FBINFO_MISC_USEREVENT;
1103                 release_console_sem();
1104                 return i;
1105         default:
1106                 if (fb->fb_ioctl == NULL)
1107                         return -EINVAL;
1108                 return fb->fb_ioctl(info, cmd, arg);
1109         }
1110 }
1111
1112 #ifdef CONFIG_COMPAT
1113 struct fb_fix_screeninfo32 {
1114         char                    id[16];
1115         compat_caddr_t          smem_start;
1116         u32                     smem_len;
1117         u32                     type;
1118         u32                     type_aux;
1119         u32                     visual;
1120         u16                     xpanstep;
1121         u16                     ypanstep;
1122         u16                     ywrapstep;
1123         u32                     line_length;
1124         compat_caddr_t          mmio_start;
1125         u32                     mmio_len;
1126         u32                     accel;
1127         u16                     reserved[3];
1128 };
1129
1130 struct fb_cmap32 {
1131         u32                     start;
1132         u32                     len;
1133         compat_caddr_t  red;
1134         compat_caddr_t  green;
1135         compat_caddr_t  blue;
1136         compat_caddr_t  transp;
1137 };
1138
1139 static int fb_getput_cmap(struct inode *inode, struct file *file,
1140                         unsigned int cmd, unsigned long arg)
1141 {
1142         struct fb_cmap_user __user *cmap;
1143         struct fb_cmap32 __user *cmap32;
1144         __u32 data;
1145         int err;
1146
1147         cmap = compat_alloc_user_space(sizeof(*cmap));
1148         cmap32 = compat_ptr(arg);
1149
1150         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1151                 return -EFAULT;
1152
1153         if (get_user(data, &cmap32->red) ||
1154             put_user(compat_ptr(data), &cmap->red) ||
1155             get_user(data, &cmap32->green) ||
1156             put_user(compat_ptr(data), &cmap->green) ||
1157             get_user(data, &cmap32->blue) ||
1158             put_user(compat_ptr(data), &cmap->blue) ||
1159             get_user(data, &cmap32->transp) ||
1160             put_user(compat_ptr(data), &cmap->transp))
1161                 return -EFAULT;
1162
1163         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1164
1165         if (!err) {
1166                 if (copy_in_user(&cmap32->start,
1167                                  &cmap->start,
1168                                  2 * sizeof(__u32)))
1169                         err = -EFAULT;
1170         }
1171         return err;
1172 }
1173
1174 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1175                                   struct fb_fix_screeninfo32 __user *fix32)
1176 {
1177         __u32 data;
1178         int err;
1179
1180         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1181
1182         data = (__u32) (unsigned long) fix->smem_start;
1183         err |= put_user(data, &fix32->smem_start);
1184
1185         err |= put_user(fix->smem_len, &fix32->smem_len);
1186         err |= put_user(fix->type, &fix32->type);
1187         err |= put_user(fix->type_aux, &fix32->type_aux);
1188         err |= put_user(fix->visual, &fix32->visual);
1189         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1190         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1191         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1192         err |= put_user(fix->line_length, &fix32->line_length);
1193
1194         data = (__u32) (unsigned long) fix->mmio_start;
1195         err |= put_user(data, &fix32->mmio_start);
1196
1197         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1198         err |= put_user(fix->accel, &fix32->accel);
1199         err |= copy_to_user(fix32->reserved, fix->reserved,
1200                             sizeof(fix->reserved));
1201
1202         return err;
1203 }
1204
1205 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1206                                 unsigned int cmd, unsigned long arg)
1207 {
1208         mm_segment_t old_fs;
1209         struct fb_fix_screeninfo fix;
1210         struct fb_fix_screeninfo32 __user *fix32;
1211         int err;
1212
1213         fix32 = compat_ptr(arg);
1214
1215         old_fs = get_fs();
1216         set_fs(KERNEL_DS);
1217         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1218         set_fs(old_fs);
1219
1220         if (!err)
1221                 err = do_fscreeninfo_to_user(&fix, fix32);
1222
1223         return err;
1224 }
1225
1226 static long
1227 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1228 {
1229         struct inode *inode = file->f_path.dentry->d_inode;
1230         int fbidx = iminor(inode);
1231         struct fb_info *info = registered_fb[fbidx];
1232         struct fb_ops *fb = info->fbops;
1233         long ret = -ENOIOCTLCMD;
1234
1235         lock_kernel();
1236         switch(cmd) {
1237         case FBIOGET_VSCREENINFO:
1238         case FBIOPUT_VSCREENINFO:
1239         case FBIOPAN_DISPLAY:
1240         case FBIOGET_CON2FBMAP:
1241         case FBIOPUT_CON2FBMAP:
1242                 arg = (unsigned long) compat_ptr(arg);
1243         case FBIOBLANK:
1244                 ret = fb_ioctl(inode, file, cmd, arg);
1245                 break;
1246
1247         case FBIOGET_FSCREENINFO:
1248                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1249                 break;
1250
1251         case FBIOGETCMAP:
1252         case FBIOPUTCMAP:
1253                 ret = fb_getput_cmap(inode, file, cmd, arg);
1254                 break;
1255
1256         default:
1257                 if (fb->fb_compat_ioctl)
1258                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1259                 break;
1260         }
1261         unlock_kernel();
1262         return ret;
1263 }
1264 #endif
1265
1266 static int
1267 fb_mmap(struct file *file, struct vm_area_struct * vma)
1268 {
1269         int fbidx = iminor(file->f_path.dentry->d_inode);
1270         struct fb_info *info = registered_fb[fbidx];
1271         struct fb_ops *fb = info->fbops;
1272         unsigned long off;
1273         unsigned long start;
1274         u32 len;
1275
1276         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1277                 return -EINVAL;
1278         off = vma->vm_pgoff << PAGE_SHIFT;
1279         if (!fb)
1280                 return -ENODEV;
1281         if (fb->fb_mmap) {
1282                 int res;
1283                 lock_kernel();
1284                 res = fb->fb_mmap(info, vma);
1285                 unlock_kernel();
1286                 return res;
1287         }
1288
1289         lock_kernel();
1290
1291         /* frame buffer memory */
1292         start = info->fix.smem_start;
1293         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1294         if (off >= len) {
1295                 /* memory mapped io */
1296                 off -= len;
1297                 if (info->var.accel_flags) {
1298                         unlock_kernel();
1299                         return -EINVAL;
1300                 }
1301                 start = info->fix.mmio_start;
1302                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1303         }
1304         unlock_kernel();
1305         start &= PAGE_MASK;
1306         if ((vma->vm_end - vma->vm_start + off) > len)
1307                 return -EINVAL;
1308         off += start;
1309         vma->vm_pgoff = off >> PAGE_SHIFT;
1310         /* This is an IO map - tell maydump to skip this VMA */
1311         vma->vm_flags |= VM_IO | VM_RESERVED;
1312         fb_pgprotect(file, vma, off);
1313         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1314                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1315                 return -EAGAIN;
1316         return 0;
1317 }
1318
1319 static int
1320 fb_open(struct inode *inode, struct file *file)
1321 {
1322         int fbidx = iminor(inode);
1323         struct fb_info *info;
1324         int res = 0;
1325
1326         if (fbidx >= FB_MAX)
1327                 return -ENODEV;
1328         lock_kernel();
1329 #ifdef CONFIG_KMOD
1330         if (!(info = registered_fb[fbidx]))
1331                 try_to_load(fbidx);
1332 #endif /* CONFIG_KMOD */
1333         if (!(info = registered_fb[fbidx])) {
1334                 res = -ENODEV;
1335                 goto out;
1336         }
1337         if (!try_module_get(info->fbops->owner)) {
1338                 res = -ENODEV;
1339                 goto out;
1340         }
1341         file->private_data = info;
1342         if (info->fbops->fb_open) {
1343                 res = info->fbops->fb_open(info,1);
1344                 if (res)
1345                         module_put(info->fbops->owner);
1346         }
1347 out:
1348         unlock_kernel();
1349         return res;
1350 }
1351
1352 static int 
1353 fb_release(struct inode *inode, struct file *file)
1354 {
1355         struct fb_info * const info = file->private_data;
1356
1357         lock_kernel();
1358         if (info->fbops->fb_release)
1359                 info->fbops->fb_release(info,1);
1360         module_put(info->fbops->owner);
1361         unlock_kernel();
1362         return 0;
1363 }
1364
1365 static const struct file_operations fb_fops = {
1366         .owner =        THIS_MODULE,
1367         .read =         fb_read,
1368         .write =        fb_write,
1369         .ioctl =        fb_ioctl,
1370 #ifdef CONFIG_COMPAT
1371         .compat_ioctl = fb_compat_ioctl,
1372 #endif
1373         .mmap =         fb_mmap,
1374         .open =         fb_open,
1375         .release =      fb_release,
1376 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1377         .get_unmapped_area = get_fb_unmapped_area,
1378 #endif
1379 #ifdef CONFIG_FB_DEFERRED_IO
1380         .fsync =        fb_deferred_io_fsync,
1381 #endif
1382 };
1383
1384 struct class *fb_class;
1385 EXPORT_SYMBOL(fb_class);
1386
1387 static int fb_check_foreignness(struct fb_info *fi)
1388 {
1389         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1390
1391         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1392
1393 #ifdef __BIG_ENDIAN
1394         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1395 #else
1396         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1397 #endif /* __BIG_ENDIAN */
1398
1399         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1400                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1401                        "support this framebuffer\n", fi->fix.id);
1402                 return -ENOSYS;
1403         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1404                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1405                        "support this framebuffer\n", fi->fix.id);
1406                 return -ENOSYS;
1407         }
1408
1409         return 0;
1410 }
1411
1412 /**
1413  *      register_framebuffer - registers a frame buffer device
1414  *      @fb_info: frame buffer info structure
1415  *
1416  *      Registers a frame buffer device @fb_info.
1417  *
1418  *      Returns negative errno on error, or zero for success.
1419  *
1420  */
1421
1422 int
1423 register_framebuffer(struct fb_info *fb_info)
1424 {
1425         int i;
1426         struct fb_event event;
1427         struct fb_videomode mode;
1428
1429         if (num_registered_fb == FB_MAX)
1430                 return -ENXIO;
1431
1432         if (fb_check_foreignness(fb_info))
1433                 return -ENOSYS;
1434
1435         num_registered_fb++;
1436         for (i = 0 ; i < FB_MAX; i++)
1437                 if (!registered_fb[i])
1438                         break;
1439         fb_info->node = i;
1440
1441         fb_info->dev = device_create_drvdata(fb_class, fb_info->device,
1442                                              MKDEV(FB_MAJOR, i), NULL,
1443                                              "fb%d", i);
1444         if (IS_ERR(fb_info->dev)) {
1445                 /* Not fatal */
1446                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1447                 fb_info->dev = NULL;
1448         } else
1449                 fb_init_device(fb_info);
1450
1451         if (fb_info->pixmap.addr == NULL) {
1452                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1453                 if (fb_info->pixmap.addr) {
1454                         fb_info->pixmap.size = FBPIXMAPSIZE;
1455                         fb_info->pixmap.buf_align = 1;
1456                         fb_info->pixmap.scan_align = 1;
1457                         fb_info->pixmap.access_align = 32;
1458                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1459                 }
1460         }       
1461         fb_info->pixmap.offset = 0;
1462
1463         if (!fb_info->pixmap.blit_x)
1464                 fb_info->pixmap.blit_x = ~(u32)0;
1465
1466         if (!fb_info->pixmap.blit_y)
1467                 fb_info->pixmap.blit_y = ~(u32)0;
1468
1469         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1470                 INIT_LIST_HEAD(&fb_info->modelist);
1471
1472         fb_var_to_videomode(&mode, &fb_info->var);
1473         fb_add_videomode(&mode, &fb_info->modelist);
1474         registered_fb[i] = fb_info;
1475
1476         event.info = fb_info;
1477         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1478         return 0;
1479 }
1480
1481
1482 /**
1483  *      unregister_framebuffer - releases a frame buffer device
1484  *      @fb_info: frame buffer info structure
1485  *
1486  *      Unregisters a frame buffer device @fb_info.
1487  *
1488  *      Returns negative errno on error, or zero for success.
1489  *
1490  *      This function will also notify the framebuffer console
1491  *      to release the driver.
1492  *
1493  *      This is meant to be called within a driver's module_exit()
1494  *      function. If this is called outside module_exit(), ensure
1495  *      that the driver implements fb_open() and fb_release() to
1496  *      check that no processes are using the device.
1497  */
1498
1499 int
1500 unregister_framebuffer(struct fb_info *fb_info)
1501 {
1502         struct fb_event event;
1503         int i, ret = 0;
1504
1505         i = fb_info->node;
1506         if (!registered_fb[i]) {
1507                 ret = -EINVAL;
1508                 goto done;
1509         }
1510
1511         event.info = fb_info;
1512         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1513
1514         if (ret) {
1515                 ret = -EINVAL;
1516                 goto done;
1517         }
1518
1519         if (fb_info->pixmap.addr &&
1520             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1521                 kfree(fb_info->pixmap.addr);
1522         fb_destroy_modelist(&fb_info->modelist);
1523         registered_fb[i]=NULL;
1524         num_registered_fb--;
1525         fb_cleanup_device(fb_info);
1526         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1527         event.info = fb_info;
1528         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1529 done:
1530         return ret;
1531 }
1532
1533 /**
1534  *      fb_set_suspend - low level driver signals suspend
1535  *      @info: framebuffer affected
1536  *      @state: 0 = resuming, !=0 = suspending
1537  *
1538  *      This is meant to be used by low level drivers to
1539  *      signal suspend/resume to the core & clients.
1540  *      It must be called with the console semaphore held
1541  */
1542 void fb_set_suspend(struct fb_info *info, int state)
1543 {
1544         struct fb_event event;
1545
1546         event.info = info;
1547         if (state) {
1548                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1549                 info->state = FBINFO_STATE_SUSPENDED;
1550         } else {
1551                 info->state = FBINFO_STATE_RUNNING;
1552                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1553         }
1554 }
1555
1556 /**
1557  *      fbmem_init - init frame buffer subsystem
1558  *
1559  *      Initialize the frame buffer subsystem.
1560  *
1561  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1562  *
1563  */
1564
1565 static int __init
1566 fbmem_init(void)
1567 {
1568         proc_create("fb", 0, NULL, &fb_proc_fops);
1569
1570         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1571                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1572
1573         fb_class = class_create(THIS_MODULE, "graphics");
1574         if (IS_ERR(fb_class)) {
1575                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1576                 fb_class = NULL;
1577         }
1578         return 0;
1579 }
1580
1581 #ifdef MODULE
1582 module_init(fbmem_init);
1583 static void __exit
1584 fbmem_exit(void)
1585 {
1586         remove_proc_entry("fb", NULL);
1587         class_destroy(fb_class);
1588         unregister_chrdev(FB_MAJOR, "fb");
1589 }
1590
1591 module_exit(fbmem_exit);
1592 MODULE_LICENSE("GPL");
1593 MODULE_DESCRIPTION("Framebuffer base");
1594 #else
1595 subsys_initcall(fbmem_init);
1596 #endif
1597
1598 int fb_new_modelist(struct fb_info *info)
1599 {
1600         struct fb_event event;
1601         struct fb_var_screeninfo var = info->var;
1602         struct list_head *pos, *n;
1603         struct fb_modelist *modelist;
1604         struct fb_videomode *m, mode;
1605         int err = 1;
1606
1607         list_for_each_safe(pos, n, &info->modelist) {
1608                 modelist = list_entry(pos, struct fb_modelist, list);
1609                 m = &modelist->mode;
1610                 fb_videomode_to_var(&var, m);
1611                 var.activate = FB_ACTIVATE_TEST;
1612                 err = fb_set_var(info, &var);
1613                 fb_var_to_videomode(&mode, &var);
1614                 if (err || !fb_mode_is_equal(m, &mode)) {
1615                         list_del(pos);
1616                         kfree(pos);
1617                 }
1618         }
1619
1620         err = 1;
1621
1622         if (!list_empty(&info->modelist)) {
1623                 event.info = info;
1624                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1625         }
1626
1627         return err;
1628 }
1629
1630 static char *video_options[FB_MAX] __read_mostly;
1631 static int ofonly __read_mostly;
1632
1633 /**
1634  * fb_get_options - get kernel boot parameters
1635  * @name:   framebuffer name as it would appear in
1636  *          the boot parameter line
1637  *          (video=<name>:<options>)
1638  * @option: the option will be stored here
1639  *
1640  * NOTE: Needed to maintain backwards compatibility
1641  */
1642 int fb_get_options(char *name, char **option)
1643 {
1644         char *opt, *options = NULL;
1645         int opt_len, retval = 0;
1646         int name_len = strlen(name), i;
1647
1648         if (name_len && ofonly && strncmp(name, "offb", 4))
1649                 retval = 1;
1650
1651         if (name_len && !retval) {
1652                 for (i = 0; i < FB_MAX; i++) {
1653                         if (video_options[i] == NULL)
1654                                 continue;
1655                         opt_len = strlen(video_options[i]);
1656                         if (!opt_len)
1657                                 continue;
1658                         opt = video_options[i];
1659                         if (!strncmp(name, opt, name_len) &&
1660                             opt[name_len] == ':')
1661                                 options = opt + name_len + 1;
1662                 }
1663         }
1664         if (options && !strncmp(options, "off", 3))
1665                 retval = 1;
1666
1667         if (option)
1668                 *option = options;
1669
1670         return retval;
1671 }
1672
1673 #ifndef MODULE
1674 /**
1675  *      video_setup - process command line options
1676  *      @options: string of options
1677  *
1678  *      Process command line options for frame buffer subsystem.
1679  *
1680  *      NOTE: This function is a __setup and __init function.
1681  *            It only stores the options.  Drivers have to call
1682  *            fb_get_options() as necessary.
1683  *
1684  *      Returns zero.
1685  *
1686  */
1687 static int __init video_setup(char *options)
1688 {
1689         int i, global = 0;
1690
1691         if (!options || !*options)
1692                 global = 1;
1693
1694         if (!global && !strncmp(options, "ofonly", 6)) {
1695                 ofonly = 1;
1696                 global = 1;
1697         }
1698
1699         if (!global && !strstr(options, "fb:")) {
1700                 fb_mode_option = options;
1701                 global = 1;
1702         }
1703
1704         if (!global) {
1705                 for (i = 0; i < FB_MAX; i++) {
1706                         if (video_options[i] == NULL) {
1707                                 video_options[i] = options;
1708                                 break;
1709                         }
1710
1711                 }
1712         }
1713
1714         return 1;
1715 }
1716 __setup("video=", video_setup);
1717 #endif
1718
1719     /*
1720      *  Visible symbols for modules
1721      */
1722
1723 EXPORT_SYMBOL(register_framebuffer);
1724 EXPORT_SYMBOL(unregister_framebuffer);
1725 EXPORT_SYMBOL(num_registered_fb);
1726 EXPORT_SYMBOL(registered_fb);
1727 EXPORT_SYMBOL(fb_show_logo);
1728 EXPORT_SYMBOL(fb_set_var);
1729 EXPORT_SYMBOL(fb_blank);
1730 EXPORT_SYMBOL(fb_pan_display);
1731 EXPORT_SYMBOL(fb_get_buffer_offset);
1732 EXPORT_SYMBOL(fb_set_suspend);
1733 EXPORT_SYMBOL(fb_get_options);
1734
1735 MODULE_LICENSE("GPL");