fbdev: make get_fb_unmapped_area depends of !MMU
[sfrench/cifs-2.6.git] / drivers / video / fbdev / core / 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/kernel.h>
20 #include <linux/major.h>
21 #include <linux/slab.h>
22 #include <linux/mm.h>
23 #include <linux/mman.h>
24 #include <linux/vt.h>
25 #include <linux/init.h>
26 #include <linux/linux_logo.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/console.h>
30 #include <linux/kmod.h>
31 #include <linux/err.h>
32 #include <linux/device.h>
33 #include <linux/efi.h>
34 #include <linux/fb.h>
35
36 #include <asm/fb.h>
37
38
39     /*
40      *  Frame buffer device initialization and setup routines
41      */
42
43 #define FBPIXMAPSIZE    (1024 * 8)
44
45 static DEFINE_MUTEX(registration_lock);
46
47 struct fb_info *registered_fb[FB_MAX] __read_mostly;
48 EXPORT_SYMBOL(registered_fb);
49
50 int num_registered_fb __read_mostly;
51 EXPORT_SYMBOL(num_registered_fb);
52
53 static struct fb_info *get_fb_info(unsigned int idx)
54 {
55         struct fb_info *fb_info;
56
57         if (idx >= FB_MAX)
58                 return ERR_PTR(-ENODEV);
59
60         mutex_lock(&registration_lock);
61         fb_info = registered_fb[idx];
62         if (fb_info)
63                 atomic_inc(&fb_info->count);
64         mutex_unlock(&registration_lock);
65
66         return fb_info;
67 }
68
69 static void put_fb_info(struct fb_info *fb_info)
70 {
71         if (!atomic_dec_and_test(&fb_info->count))
72                 return;
73         if (fb_info->fbops->fb_destroy)
74                 fb_info->fbops->fb_destroy(fb_info);
75 }
76
77 int lock_fb_info(struct fb_info *info)
78 {
79         mutex_lock(&info->lock);
80         if (!info->fbops) {
81                 mutex_unlock(&info->lock);
82                 return 0;
83         }
84         return 1;
85 }
86 EXPORT_SYMBOL(lock_fb_info);
87
88 /*
89  * Helpers
90  */
91
92 int fb_get_color_depth(struct fb_var_screeninfo *var,
93                        struct fb_fix_screeninfo *fix)
94 {
95         int depth = 0;
96
97         if (fix->visual == FB_VISUAL_MONO01 ||
98             fix->visual == FB_VISUAL_MONO10)
99                 depth = 1;
100         else {
101                 if (var->green.length == var->blue.length &&
102                     var->green.length == var->red.length &&
103                     var->green.offset == var->blue.offset &&
104                     var->green.offset == var->red.offset)
105                         depth = var->green.length;
106                 else
107                         depth = var->green.length + var->red.length +
108                                 var->blue.length;
109         }
110
111         return depth;
112 }
113 EXPORT_SYMBOL(fb_get_color_depth);
114
115 /*
116  * Data padding functions.
117  */
118 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
119 {
120         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
121 }
122 EXPORT_SYMBOL(fb_pad_aligned_buffer);
123
124 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
125                                 u32 shift_high, u32 shift_low, u32 mod)
126 {
127         u8 mask = (u8) (0xfff << shift_high), tmp;
128         int i, j;
129
130         for (i = height; i--; ) {
131                 for (j = 0; j < idx; j++) {
132                         tmp = dst[j];
133                         tmp &= mask;
134                         tmp |= *src >> shift_low;
135                         dst[j] = tmp;
136                         tmp = *src << shift_high;
137                         dst[j+1] = tmp;
138                         src++;
139                 }
140                 tmp = dst[idx];
141                 tmp &= mask;
142                 tmp |= *src >> shift_low;
143                 dst[idx] = tmp;
144                 if (shift_high < mod) {
145                         tmp = *src << shift_high;
146                         dst[idx+1] = tmp;
147                 }
148                 src++;
149                 dst += d_pitch;
150         }
151 }
152 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
153
154 /*
155  * we need to lock this section since fb_cursor
156  * may use fb_imageblit()
157  */
158 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
159 {
160         u32 align = buf->buf_align - 1, offset;
161         char *addr = buf->addr;
162
163         /* If IO mapped, we need to sync before access, no sharing of
164          * the pixmap is done
165          */
166         if (buf->flags & FB_PIXMAP_IO) {
167                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
168                         info->fbops->fb_sync(info);
169                 return addr;
170         }
171
172         /* See if we fit in the remaining pixmap space */
173         offset = buf->offset + align;
174         offset &= ~align;
175         if (offset + size > buf->size) {
176                 /* We do not fit. In order to be able to re-use the buffer,
177                  * we must ensure no asynchronous DMA'ing or whatever operation
178                  * is in progress, we sync for that.
179                  */
180                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
181                         info->fbops->fb_sync(info);
182                 offset = 0;
183         }
184         buf->offset = offset + size;
185         addr += offset;
186
187         return addr;
188 }
189 EXPORT_SYMBOL(fb_get_buffer_offset);
190
191 #ifdef CONFIG_LOGO
192
193 static inline unsigned safe_shift(unsigned d, int n)
194 {
195         return n < 0 ? d >> -n : d << n;
196 }
197
198 static void fb_set_logocmap(struct fb_info *info,
199                                    const struct linux_logo *logo)
200 {
201         struct fb_cmap palette_cmap;
202         u16 palette_green[16];
203         u16 palette_blue[16];
204         u16 palette_red[16];
205         int i, j, n;
206         const unsigned char *clut = logo->clut;
207
208         palette_cmap.start = 0;
209         palette_cmap.len = 16;
210         palette_cmap.red = palette_red;
211         palette_cmap.green = palette_green;
212         palette_cmap.blue = palette_blue;
213         palette_cmap.transp = NULL;
214
215         for (i = 0; i < logo->clutsize; i += n) {
216                 n = logo->clutsize - i;
217                 /* palette_cmap provides space for only 16 colors at once */
218                 if (n > 16)
219                         n = 16;
220                 palette_cmap.start = 32 + i;
221                 palette_cmap.len = n;
222                 for (j = 0; j < n; ++j) {
223                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
224                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
225                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
226                         clut += 3;
227                 }
228                 fb_set_cmap(&palette_cmap, info);
229         }
230 }
231
232 static void  fb_set_logo_truepalette(struct fb_info *info,
233                                             const struct linux_logo *logo,
234                                             u32 *palette)
235 {
236         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
237         unsigned char redmask, greenmask, bluemask;
238         int redshift, greenshift, blueshift;
239         int i;
240         const unsigned char *clut = logo->clut;
241
242         /*
243          * We have to create a temporary palette since console palette is only
244          * 16 colors long.
245          */
246         /* Bug: Doesn't obey msb_right ... (who needs that?) */
247         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
248         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
249         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
250         redshift   = info->var.red.offset   - (8 - info->var.red.length);
251         greenshift = info->var.green.offset - (8 - info->var.green.length);
252         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
253
254         for ( i = 0; i < logo->clutsize; i++) {
255                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
256                                  safe_shift((clut[1] & greenmask), greenshift) |
257                                  safe_shift((clut[2] & bluemask), blueshift));
258                 clut += 3;
259         }
260 }
261
262 static void fb_set_logo_directpalette(struct fb_info *info,
263                                              const struct linux_logo *logo,
264                                              u32 *palette)
265 {
266         int redshift, greenshift, blueshift;
267         int i;
268
269         redshift = info->var.red.offset;
270         greenshift = info->var.green.offset;
271         blueshift = info->var.blue.offset;
272
273         for (i = 32; i < 32 + logo->clutsize; i++)
274                 palette[i] = i << redshift | i << greenshift | i << blueshift;
275 }
276
277 static void fb_set_logo(struct fb_info *info,
278                                const struct linux_logo *logo, u8 *dst,
279                                int depth)
280 {
281         int i, j, k;
282         const u8 *src = logo->data;
283         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
284         u8 fg = 1, d;
285
286         switch (fb_get_color_depth(&info->var, &info->fix)) {
287         case 1:
288                 fg = 1;
289                 break;
290         case 2:
291                 fg = 3;
292                 break;
293         default:
294                 fg = 7;
295                 break;
296         }
297
298         if (info->fix.visual == FB_VISUAL_MONO01 ||
299             info->fix.visual == FB_VISUAL_MONO10)
300                 fg = ~((u8) (0xfff << info->var.green.length));
301
302         switch (depth) {
303         case 4:
304                 for (i = 0; i < logo->height; i++)
305                         for (j = 0; j < logo->width; src++) {
306                                 *dst++ = *src >> 4;
307                                 j++;
308                                 if (j < logo->width) {
309                                         *dst++ = *src & 0x0f;
310                                         j++;
311                                 }
312                         }
313                 break;
314         case 1:
315                 for (i = 0; i < logo->height; i++) {
316                         for (j = 0; j < logo->width; src++) {
317                                 d = *src ^ xor;
318                                 for (k = 7; k >= 0; k--) {
319                                         *dst++ = ((d >> k) & 1) ? fg : 0;
320                                         j++;
321                                 }
322                         }
323                 }
324                 break;
325         }
326 }
327
328 /*
329  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
330  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
331  * the visual format and color depth of the framebuffer, the DAC, the
332  * pseudo_palette, and the logo data will be adjusted accordingly.
333  *
334  * Case 1 - linux_logo_clut224:
335  * Color exceeds the number of console colors (16), thus we set the hardware DAC
336  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
337  *
338  * For visuals that require color info from the pseudo_palette, we also construct
339  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
340  * will be set.
341  *
342  * Case 2 - linux_logo_vga16:
343  * The number of colors just matches the console colors, thus there is no need
344  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
345  * each byte contains color information for two pixels (upper and lower nibble).
346  * To be consistent with fb_imageblit() usage, we therefore separate the two
347  * nibbles into separate bytes. The "depth" flag will be set to 4.
348  *
349  * Case 3 - linux_logo_mono:
350  * This is similar with Case 2.  Each byte contains information for 8 pixels.
351  * We isolate each bit and expand each into a byte. The "depth" flag will
352  * be set to 1.
353  */
354 static struct logo_data {
355         int depth;
356         int needs_directpalette;
357         int needs_truepalette;
358         int needs_cmapreset;
359         const struct linux_logo *logo;
360 } fb_logo __read_mostly;
361
362 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
363 {
364         u32 size = width * height, i;
365
366         out += size - 1;
367
368         for (i = size; i--; )
369                 *out-- = *in++;
370 }
371
372 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
373 {
374         int i, j, h = height - 1;
375
376         for (i = 0; i < height; i++)
377                 for (j = 0; j < width; j++)
378                                 out[height * j + h - i] = *in++;
379 }
380
381 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
382 {
383         int i, j, w = width - 1;
384
385         for (i = 0; i < height; i++)
386                 for (j = 0; j < width; j++)
387                         out[height * (w - j) + i] = *in++;
388 }
389
390 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
391                            struct fb_image *image, int rotate)
392 {
393         u32 tmp;
394
395         if (rotate == FB_ROTATE_UD) {
396                 fb_rotate_logo_ud(image->data, dst, image->width,
397                                   image->height);
398                 image->dx = info->var.xres - image->width - image->dx;
399                 image->dy = info->var.yres - image->height - image->dy;
400         } else if (rotate == FB_ROTATE_CW) {
401                 fb_rotate_logo_cw(image->data, dst, image->width,
402                                   image->height);
403                 tmp = image->width;
404                 image->width = image->height;
405                 image->height = tmp;
406                 tmp = image->dy;
407                 image->dy = image->dx;
408                 image->dx = info->var.xres - image->width - tmp;
409         } else if (rotate == FB_ROTATE_CCW) {
410                 fb_rotate_logo_ccw(image->data, dst, image->width,
411                                    image->height);
412                 tmp = image->width;
413                 image->width = image->height;
414                 image->height = tmp;
415                 tmp = image->dx;
416                 image->dx = image->dy;
417                 image->dy = info->var.yres - image->height - tmp;
418         }
419
420         image->data = dst;
421 }
422
423 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
424                             int rotate, unsigned int num)
425 {
426         unsigned int x;
427
428         if (rotate == FB_ROTATE_UR) {
429                 for (x = 0;
430                      x < num && image->dx + image->width <= info->var.xres;
431                      x++) {
432                         info->fbops->fb_imageblit(info, image);
433                         image->dx += image->width + 8;
434                 }
435         } else if (rotate == FB_ROTATE_UD) {
436                 for (x = 0; x < num; x++) {
437                         info->fbops->fb_imageblit(info, image);
438                         image->dx -= image->width + 8;
439                 }
440         } else if (rotate == FB_ROTATE_CW) {
441                 for (x = 0;
442                      x < num && image->dy + image->height <= info->var.yres;
443                      x++) {
444                         info->fbops->fb_imageblit(info, image);
445                         image->dy += image->height + 8;
446                 }
447         } else if (rotate == FB_ROTATE_CCW) {
448                 for (x = 0; x < num; x++) {
449                         info->fbops->fb_imageblit(info, image);
450                         image->dy -= image->height + 8;
451                 }
452         }
453 }
454
455 static int fb_show_logo_line(struct fb_info *info, int rotate,
456                              const struct linux_logo *logo, int y,
457                              unsigned int n)
458 {
459         u32 *palette = NULL, *saved_pseudo_palette = NULL;
460         unsigned char *logo_new = NULL, *logo_rotate = NULL;
461         struct fb_image image;
462
463         /* Return if the frame buffer is not mapped or suspended */
464         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
465             info->flags & FBINFO_MODULE)
466                 return 0;
467
468         image.depth = 8;
469         image.data = logo->data;
470
471         if (fb_logo.needs_cmapreset)
472                 fb_set_logocmap(info, logo);
473
474         if (fb_logo.needs_truepalette ||
475             fb_logo.needs_directpalette) {
476                 palette = kmalloc(256 * 4, GFP_KERNEL);
477                 if (palette == NULL)
478                         return 0;
479
480                 if (fb_logo.needs_truepalette)
481                         fb_set_logo_truepalette(info, logo, palette);
482                 else
483                         fb_set_logo_directpalette(info, logo, palette);
484
485                 saved_pseudo_palette = info->pseudo_palette;
486                 info->pseudo_palette = palette;
487         }
488
489         if (fb_logo.depth <= 4) {
490                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
491                 if (logo_new == NULL) {
492                         kfree(palette);
493                         if (saved_pseudo_palette)
494                                 info->pseudo_palette = saved_pseudo_palette;
495                         return 0;
496                 }
497                 image.data = logo_new;
498                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
499         }
500
501         image.dx = 0;
502         image.dy = y;
503         image.width = logo->width;
504         image.height = logo->height;
505
506         if (rotate) {
507                 logo_rotate = kmalloc(logo->width *
508                                       logo->height, GFP_KERNEL);
509                 if (logo_rotate)
510                         fb_rotate_logo(info, logo_rotate, &image, rotate);
511         }
512
513         fb_do_show_logo(info, &image, rotate, n);
514
515         kfree(palette);
516         if (saved_pseudo_palette != NULL)
517                 info->pseudo_palette = saved_pseudo_palette;
518         kfree(logo_new);
519         kfree(logo_rotate);
520         return logo->height;
521 }
522
523
524 #ifdef CONFIG_FB_LOGO_EXTRA
525
526 #define FB_LOGO_EX_NUM_MAX 10
527 static struct logo_data_extra {
528         const struct linux_logo *logo;
529         unsigned int n;
530 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
531 static unsigned int fb_logo_ex_num;
532
533 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
534 {
535         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
536                 return;
537
538         fb_logo_ex[fb_logo_ex_num].logo = logo;
539         fb_logo_ex[fb_logo_ex_num].n = n;
540         fb_logo_ex_num++;
541 }
542
543 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
544                                   unsigned int yres)
545 {
546         unsigned int i;
547
548         /* FIXME: logo_ex supports only truecolor fb. */
549         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
550                 fb_logo_ex_num = 0;
551
552         for (i = 0; i < fb_logo_ex_num; i++) {
553                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
554                         fb_logo_ex[i].logo = NULL;
555                         continue;
556                 }
557                 height += fb_logo_ex[i].logo->height;
558                 if (height > yres) {
559                         height -= fb_logo_ex[i].logo->height;
560                         fb_logo_ex_num = i;
561                         break;
562                 }
563         }
564         return height;
565 }
566
567 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
568 {
569         unsigned int i;
570
571         for (i = 0; i < fb_logo_ex_num; i++)
572                 y += fb_show_logo_line(info, rotate,
573                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
574
575         return y;
576 }
577
578 #else /* !CONFIG_FB_LOGO_EXTRA */
579
580 static inline int fb_prepare_extra_logos(struct fb_info *info,
581                                          unsigned int height,
582                                          unsigned int yres)
583 {
584         return height;
585 }
586
587 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
588 {
589         return y;
590 }
591
592 #endif /* CONFIG_FB_LOGO_EXTRA */
593
594
595 int fb_prepare_logo(struct fb_info *info, int rotate)
596 {
597         int depth = fb_get_color_depth(&info->var, &info->fix);
598         unsigned int yres;
599
600         memset(&fb_logo, 0, sizeof(struct logo_data));
601
602         if (info->flags & FBINFO_MISC_TILEBLITTING ||
603             info->flags & FBINFO_MODULE)
604                 return 0;
605
606         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
607                 depth = info->var.blue.length;
608                 if (info->var.red.length < depth)
609                         depth = info->var.red.length;
610                 if (info->var.green.length < depth)
611                         depth = info->var.green.length;
612         }
613
614         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
615                 /* assume console colormap */
616                 depth = 4;
617         }
618
619         /* Return if no suitable logo was found */
620         fb_logo.logo = fb_find_logo(depth);
621
622         if (!fb_logo.logo) {
623                 return 0;
624         }
625
626         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
627                 yres = info->var.yres;
628         else
629                 yres = info->var.xres;
630
631         if (fb_logo.logo->height > yres) {
632                 fb_logo.logo = NULL;
633                 return 0;
634         }
635
636         /* What depth we asked for might be different from what we get */
637         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
638                 fb_logo.depth = 8;
639         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
640                 fb_logo.depth = 4;
641         else
642                 fb_logo.depth = 1;
643
644
645         if (fb_logo.depth > 4 && depth > 4) {
646                 switch (info->fix.visual) {
647                 case FB_VISUAL_TRUECOLOR:
648                         fb_logo.needs_truepalette = 1;
649                         break;
650                 case FB_VISUAL_DIRECTCOLOR:
651                         fb_logo.needs_directpalette = 1;
652                         fb_logo.needs_cmapreset = 1;
653                         break;
654                 case FB_VISUAL_PSEUDOCOLOR:
655                         fb_logo.needs_cmapreset = 1;
656                         break;
657                 }
658         }
659
660         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
661 }
662
663 int fb_show_logo(struct fb_info *info, int rotate)
664 {
665         int y;
666
667         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
668                               num_online_cpus());
669         y = fb_show_extra_logos(info, y, rotate);
670
671         return y;
672 }
673 #else
674 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
675 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
676 #endif /* CONFIG_LOGO */
677 EXPORT_SYMBOL(fb_prepare_logo);
678 EXPORT_SYMBOL(fb_show_logo);
679
680 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
681 {
682         mutex_lock(&registration_lock);
683         return (*pos < FB_MAX) ? pos : NULL;
684 }
685
686 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
687 {
688         (*pos)++;
689         return (*pos < FB_MAX) ? pos : NULL;
690 }
691
692 static void fb_seq_stop(struct seq_file *m, void *v)
693 {
694         mutex_unlock(&registration_lock);
695 }
696
697 static int fb_seq_show(struct seq_file *m, void *v)
698 {
699         int i = *(loff_t *)v;
700         struct fb_info *fi = registered_fb[i];
701
702         if (fi)
703                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
704         return 0;
705 }
706
707 static const struct seq_operations proc_fb_seq_ops = {
708         .start  = fb_seq_start,
709         .next   = fb_seq_next,
710         .stop   = fb_seq_stop,
711         .show   = fb_seq_show,
712 };
713
714 static int proc_fb_open(struct inode *inode, struct file *file)
715 {
716         return seq_open(file, &proc_fb_seq_ops);
717 }
718
719 static const struct file_operations fb_proc_fops = {
720         .owner          = THIS_MODULE,
721         .open           = proc_fb_open,
722         .read           = seq_read,
723         .llseek         = seq_lseek,
724         .release        = seq_release,
725 };
726
727 /*
728  * We hold a reference to the fb_info in file->private_data,
729  * but if the current registered fb has changed, we don't
730  * actually want to use it.
731  *
732  * So look up the fb_info using the inode minor number,
733  * and just verify it against the reference we have.
734  */
735 static struct fb_info *file_fb_info(struct file *file)
736 {
737         struct inode *inode = file_inode(file);
738         int fbidx = iminor(inode);
739         struct fb_info *info = registered_fb[fbidx];
740
741         if (info != file->private_data)
742                 info = NULL;
743         return info;
744 }
745
746 static ssize_t
747 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
748 {
749         unsigned long p = *ppos;
750         struct fb_info *info = file_fb_info(file);
751         u8 *buffer, *dst;
752         u8 __iomem *src;
753         int c, cnt = 0, err = 0;
754         unsigned long total_size;
755
756         if (!info || ! info->screen_base)
757                 return -ENODEV;
758
759         if (info->state != FBINFO_STATE_RUNNING)
760                 return -EPERM;
761
762         if (info->fbops->fb_read)
763                 return info->fbops->fb_read(info, buf, count, ppos);
764         
765         total_size = info->screen_size;
766
767         if (total_size == 0)
768                 total_size = info->fix.smem_len;
769
770         if (p >= total_size)
771                 return 0;
772
773         if (count >= total_size)
774                 count = total_size;
775
776         if (count + p > total_size)
777                 count = total_size - p;
778
779         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
780                          GFP_KERNEL);
781         if (!buffer)
782                 return -ENOMEM;
783
784         src = (u8 __iomem *) (info->screen_base + p);
785
786         if (info->fbops->fb_sync)
787                 info->fbops->fb_sync(info);
788
789         while (count) {
790                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
791                 dst = buffer;
792                 fb_memcpy_fromfb(dst, src, c);
793                 dst += c;
794                 src += c;
795
796                 if (copy_to_user(buf, buffer, c)) {
797                         err = -EFAULT;
798                         break;
799                 }
800                 *ppos += c;
801                 buf += c;
802                 cnt += c;
803                 count -= c;
804         }
805
806         kfree(buffer);
807
808         return (err) ? err : cnt;
809 }
810
811 static ssize_t
812 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
813 {
814         unsigned long p = *ppos;
815         struct fb_info *info = file_fb_info(file);
816         u8 *buffer, *src;
817         u8 __iomem *dst;
818         int c, cnt = 0, err = 0;
819         unsigned long total_size;
820
821         if (!info || !info->screen_base)
822                 return -ENODEV;
823
824         if (info->state != FBINFO_STATE_RUNNING)
825                 return -EPERM;
826
827         if (info->fbops->fb_write)
828                 return info->fbops->fb_write(info, buf, count, ppos);
829         
830         total_size = info->screen_size;
831
832         if (total_size == 0)
833                 total_size = info->fix.smem_len;
834
835         if (p > total_size)
836                 return -EFBIG;
837
838         if (count > total_size) {
839                 err = -EFBIG;
840                 count = total_size;
841         }
842
843         if (count + p > total_size) {
844                 if (!err)
845                         err = -ENOSPC;
846
847                 count = total_size - p;
848         }
849
850         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
851                          GFP_KERNEL);
852         if (!buffer)
853                 return -ENOMEM;
854
855         dst = (u8 __iomem *) (info->screen_base + p);
856
857         if (info->fbops->fb_sync)
858                 info->fbops->fb_sync(info);
859
860         while (count) {
861                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
862                 src = buffer;
863
864                 if (copy_from_user(src, buf, c)) {
865                         err = -EFAULT;
866                         break;
867                 }
868
869                 fb_memcpy_tofb(dst, src, c);
870                 dst += c;
871                 src += c;
872                 *ppos += c;
873                 buf += c;
874                 cnt += c;
875                 count -= c;
876         }
877
878         kfree(buffer);
879
880         return (cnt) ? cnt : err;
881 }
882
883 int
884 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
885 {
886         struct fb_fix_screeninfo *fix = &info->fix;
887         unsigned int yres = info->var.yres;
888         int err = 0;
889
890         if (var->yoffset > 0) {
891                 if (var->vmode & FB_VMODE_YWRAP) {
892                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
893                                 err = -EINVAL;
894                         else
895                                 yres = 0;
896                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
897                         err = -EINVAL;
898         }
899
900         if (var->xoffset > 0 && (!fix->xpanstep ||
901                                  (var->xoffset % fix->xpanstep)))
902                 err = -EINVAL;
903
904         if (err || !info->fbops->fb_pan_display ||
905             var->yoffset > info->var.yres_virtual - yres ||
906             var->xoffset > info->var.xres_virtual - info->var.xres)
907                 return -EINVAL;
908
909         if ((err = info->fbops->fb_pan_display(var, info)))
910                 return err;
911         info->var.xoffset = var->xoffset;
912         info->var.yoffset = var->yoffset;
913         if (var->vmode & FB_VMODE_YWRAP)
914                 info->var.vmode |= FB_VMODE_YWRAP;
915         else
916                 info->var.vmode &= ~FB_VMODE_YWRAP;
917         return 0;
918 }
919 EXPORT_SYMBOL(fb_pan_display);
920
921 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
922                          u32 activate)
923 {
924         struct fb_event event;
925         struct fb_blit_caps caps, fbcaps;
926         int err = 0;
927
928         memset(&caps, 0, sizeof(caps));
929         memset(&fbcaps, 0, sizeof(fbcaps));
930         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
931         event.info = info;
932         event.data = &caps;
933         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
934         info->fbops->fb_get_caps(info, &fbcaps, var);
935
936         if (((fbcaps.x ^ caps.x) & caps.x) ||
937             ((fbcaps.y ^ caps.y) & caps.y) ||
938             (fbcaps.len < caps.len))
939                 err = -EINVAL;
940
941         return err;
942 }
943
944 int
945 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
946 {
947         int flags = info->flags;
948         int ret = 0;
949
950         if (var->activate & FB_ACTIVATE_INV_MODE) {
951                 struct fb_videomode mode1, mode2;
952
953                 fb_var_to_videomode(&mode1, var);
954                 fb_var_to_videomode(&mode2, &info->var);
955                 /* make sure we don't delete the videomode of current var */
956                 ret = fb_mode_is_equal(&mode1, &mode2);
957
958                 if (!ret) {
959                     struct fb_event event;
960
961                     event.info = info;
962                     event.data = &mode1;
963                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
964                 }
965
966                 if (!ret)
967                     fb_delete_videomode(&mode1, &info->modelist);
968
969
970                 ret = (ret) ? -EINVAL : 0;
971                 goto done;
972         }
973
974         if ((var->activate & FB_ACTIVATE_FORCE) ||
975             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
976                 u32 activate = var->activate;
977
978                 /* When using FOURCC mode, make sure the red, green, blue and
979                  * transp fields are set to 0.
980                  */
981                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
982                     var->grayscale > 1) {
983                         if (var->red.offset     || var->green.offset    ||
984                             var->blue.offset    || var->transp.offset   ||
985                             var->red.length     || var->green.length    ||
986                             var->blue.length    || var->transp.length   ||
987                             var->red.msb_right  || var->green.msb_right ||
988                             var->blue.msb_right || var->transp.msb_right)
989                                 return -EINVAL;
990                 }
991
992                 if (!info->fbops->fb_check_var) {
993                         *var = info->var;
994                         goto done;
995                 }
996
997                 ret = info->fbops->fb_check_var(var, info);
998
999                 if (ret)
1000                         goto done;
1001
1002                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1003                         struct fb_var_screeninfo old_var;
1004                         struct fb_videomode mode;
1005
1006                         if (info->fbops->fb_get_caps) {
1007                                 ret = fb_check_caps(info, var, activate);
1008
1009                                 if (ret)
1010                                         goto done;
1011                         }
1012
1013                         old_var = info->var;
1014                         info->var = *var;
1015
1016                         if (info->fbops->fb_set_par) {
1017                                 ret = info->fbops->fb_set_par(info);
1018
1019                                 if (ret) {
1020                                         info->var = old_var;
1021                                         printk(KERN_WARNING "detected "
1022                                                 "fb_set_par error, "
1023                                                 "error code: %d\n", ret);
1024                                         goto done;
1025                                 }
1026                         }
1027
1028                         fb_pan_display(info, &info->var);
1029                         fb_set_cmap(&info->cmap, info);
1030                         fb_var_to_videomode(&mode, &info->var);
1031
1032                         if (info->modelist.prev && info->modelist.next &&
1033                             !list_empty(&info->modelist))
1034                                 ret = fb_add_videomode(&mode, &info->modelist);
1035
1036                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1037                                 struct fb_event event;
1038                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1039                                         FB_EVENT_MODE_CHANGE_ALL :
1040                                         FB_EVENT_MODE_CHANGE;
1041
1042                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1043                                 event.info = info;
1044                                 event.data = &mode;
1045                                 fb_notifier_call_chain(evnt, &event);
1046                         }
1047                 }
1048         }
1049
1050  done:
1051         return ret;
1052 }
1053 EXPORT_SYMBOL(fb_set_var);
1054
1055 int
1056 fb_blank(struct fb_info *info, int blank)
1057 {       
1058         struct fb_event event;
1059         int ret = -EINVAL, early_ret;
1060
1061         if (blank > FB_BLANK_POWERDOWN)
1062                 blank = FB_BLANK_POWERDOWN;
1063
1064         event.info = info;
1065         event.data = &blank;
1066
1067         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1068
1069         if (info->fbops->fb_blank)
1070                 ret = info->fbops->fb_blank(blank, info);
1071
1072         if (!ret)
1073                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1074         else {
1075                 /*
1076                  * if fb_blank is failed then revert effects of
1077                  * the early blank event.
1078                  */
1079                 if (!early_ret)
1080                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1081         }
1082
1083         return ret;
1084 }
1085 EXPORT_SYMBOL(fb_blank);
1086
1087 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1088                         unsigned long arg)
1089 {
1090         struct fb_ops *fb;
1091         struct fb_var_screeninfo var;
1092         struct fb_fix_screeninfo fix;
1093         struct fb_con2fbmap con2fb;
1094         struct fb_cmap cmap_from;
1095         struct fb_cmap_user cmap;
1096         struct fb_event event;
1097         void __user *argp = (void __user *)arg;
1098         long ret = 0;
1099
1100         switch (cmd) {
1101         case FBIOGET_VSCREENINFO:
1102                 if (!lock_fb_info(info))
1103                         return -ENODEV;
1104                 var = info->var;
1105                 unlock_fb_info(info);
1106
1107                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1108                 break;
1109         case FBIOPUT_VSCREENINFO:
1110                 if (copy_from_user(&var, argp, sizeof(var)))
1111                         return -EFAULT;
1112                 console_lock();
1113                 if (!lock_fb_info(info)) {
1114                         console_unlock();
1115                         return -ENODEV;
1116                 }
1117                 info->flags |= FBINFO_MISC_USEREVENT;
1118                 ret = fb_set_var(info, &var);
1119                 info->flags &= ~FBINFO_MISC_USEREVENT;
1120                 unlock_fb_info(info);
1121                 console_unlock();
1122                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1123                         ret = -EFAULT;
1124                 break;
1125         case FBIOGET_FSCREENINFO:
1126                 if (!lock_fb_info(info))
1127                         return -ENODEV;
1128                 fix = info->fix;
1129                 unlock_fb_info(info);
1130
1131                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1132                 break;
1133         case FBIOPUTCMAP:
1134                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1135                         return -EFAULT;
1136                 ret = fb_set_user_cmap(&cmap, info);
1137                 break;
1138         case FBIOGETCMAP:
1139                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1140                         return -EFAULT;
1141                 if (!lock_fb_info(info))
1142                         return -ENODEV;
1143                 cmap_from = info->cmap;
1144                 unlock_fb_info(info);
1145                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1146                 break;
1147         case FBIOPAN_DISPLAY:
1148                 if (copy_from_user(&var, argp, sizeof(var)))
1149                         return -EFAULT;
1150                 console_lock();
1151                 if (!lock_fb_info(info)) {
1152                         console_unlock();
1153                         return -ENODEV;
1154                 }
1155                 ret = fb_pan_display(info, &var);
1156                 unlock_fb_info(info);
1157                 console_unlock();
1158                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1159                         return -EFAULT;
1160                 break;
1161         case FBIO_CURSOR:
1162                 ret = -EINVAL;
1163                 break;
1164         case FBIOGET_CON2FBMAP:
1165                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1166                         return -EFAULT;
1167                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1168                         return -EINVAL;
1169                 con2fb.framebuffer = -1;
1170                 event.data = &con2fb;
1171                 if (!lock_fb_info(info))
1172                         return -ENODEV;
1173                 event.info = info;
1174                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1175                 unlock_fb_info(info);
1176                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1177                 break;
1178         case FBIOPUT_CON2FBMAP:
1179                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1180                         return -EFAULT;
1181                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1182                         return -EINVAL;
1183                 if (con2fb.framebuffer >= FB_MAX)
1184                         return -EINVAL;
1185                 if (!registered_fb[con2fb.framebuffer])
1186                         request_module("fb%d", con2fb.framebuffer);
1187                 if (!registered_fb[con2fb.framebuffer]) {
1188                         ret = -EINVAL;
1189                         break;
1190                 }
1191                 event.data = &con2fb;
1192                 console_lock();
1193                 if (!lock_fb_info(info)) {
1194                         console_unlock();
1195                         return -ENODEV;
1196                 }
1197                 event.info = info;
1198                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1199                 unlock_fb_info(info);
1200                 console_unlock();
1201                 break;
1202         case FBIOBLANK:
1203                 console_lock();
1204                 if (!lock_fb_info(info)) {
1205                         console_unlock();
1206                         return -ENODEV;
1207                 }
1208                 info->flags |= FBINFO_MISC_USEREVENT;
1209                 ret = fb_blank(info, arg);
1210                 info->flags &= ~FBINFO_MISC_USEREVENT;
1211                 unlock_fb_info(info);
1212                 console_unlock();
1213                 break;
1214         default:
1215                 if (!lock_fb_info(info))
1216                         return -ENODEV;
1217                 fb = info->fbops;
1218                 if (fb->fb_ioctl)
1219                         ret = fb->fb_ioctl(info, cmd, arg);
1220                 else
1221                         ret = -ENOTTY;
1222                 unlock_fb_info(info);
1223         }
1224         return ret;
1225 }
1226
1227 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1228 {
1229         struct fb_info *info = file_fb_info(file);
1230
1231         if (!info)
1232                 return -ENODEV;
1233         return do_fb_ioctl(info, cmd, arg);
1234 }
1235
1236 #ifdef CONFIG_COMPAT
1237 struct fb_fix_screeninfo32 {
1238         char                    id[16];
1239         compat_caddr_t          smem_start;
1240         u32                     smem_len;
1241         u32                     type;
1242         u32                     type_aux;
1243         u32                     visual;
1244         u16                     xpanstep;
1245         u16                     ypanstep;
1246         u16                     ywrapstep;
1247         u32                     line_length;
1248         compat_caddr_t          mmio_start;
1249         u32                     mmio_len;
1250         u32                     accel;
1251         u16                     reserved[3];
1252 };
1253
1254 struct fb_cmap32 {
1255         u32                     start;
1256         u32                     len;
1257         compat_caddr_t  red;
1258         compat_caddr_t  green;
1259         compat_caddr_t  blue;
1260         compat_caddr_t  transp;
1261 };
1262
1263 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1264                           unsigned long arg)
1265 {
1266         struct fb_cmap_user __user *cmap;
1267         struct fb_cmap32 __user *cmap32;
1268         __u32 data;
1269         int err;
1270
1271         cmap = compat_alloc_user_space(sizeof(*cmap));
1272         cmap32 = compat_ptr(arg);
1273
1274         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1275                 return -EFAULT;
1276
1277         if (get_user(data, &cmap32->red) ||
1278             put_user(compat_ptr(data), &cmap->red) ||
1279             get_user(data, &cmap32->green) ||
1280             put_user(compat_ptr(data), &cmap->green) ||
1281             get_user(data, &cmap32->blue) ||
1282             put_user(compat_ptr(data), &cmap->blue) ||
1283             get_user(data, &cmap32->transp) ||
1284             put_user(compat_ptr(data), &cmap->transp))
1285                 return -EFAULT;
1286
1287         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1288
1289         if (!err) {
1290                 if (copy_in_user(&cmap32->start,
1291                                  &cmap->start,
1292                                  2 * sizeof(__u32)))
1293                         err = -EFAULT;
1294         }
1295         return err;
1296 }
1297
1298 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1299                                   struct fb_fix_screeninfo32 __user *fix32)
1300 {
1301         __u32 data;
1302         int err;
1303
1304         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1305
1306         data = (__u32) (unsigned long) fix->smem_start;
1307         err |= put_user(data, &fix32->smem_start);
1308
1309         err |= put_user(fix->smem_len, &fix32->smem_len);
1310         err |= put_user(fix->type, &fix32->type);
1311         err |= put_user(fix->type_aux, &fix32->type_aux);
1312         err |= put_user(fix->visual, &fix32->visual);
1313         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1314         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1315         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1316         err |= put_user(fix->line_length, &fix32->line_length);
1317
1318         data = (__u32) (unsigned long) fix->mmio_start;
1319         err |= put_user(data, &fix32->mmio_start);
1320
1321         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1322         err |= put_user(fix->accel, &fix32->accel);
1323         err |= copy_to_user(fix32->reserved, fix->reserved,
1324                             sizeof(fix->reserved));
1325
1326         if (err)
1327                 return -EFAULT;
1328         return 0;
1329 }
1330
1331 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1332                               unsigned long arg)
1333 {
1334         mm_segment_t old_fs;
1335         struct fb_fix_screeninfo fix;
1336         struct fb_fix_screeninfo32 __user *fix32;
1337         int err;
1338
1339         fix32 = compat_ptr(arg);
1340
1341         old_fs = get_fs();
1342         set_fs(KERNEL_DS);
1343         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1344         set_fs(old_fs);
1345
1346         if (!err)
1347                 err = do_fscreeninfo_to_user(&fix, fix32);
1348
1349         return err;
1350 }
1351
1352 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1353                             unsigned long arg)
1354 {
1355         struct fb_info *info = file_fb_info(file);
1356         struct fb_ops *fb;
1357         long ret = -ENOIOCTLCMD;
1358
1359         if (!info)
1360                 return -ENODEV;
1361         fb = info->fbops;
1362         switch(cmd) {
1363         case FBIOGET_VSCREENINFO:
1364         case FBIOPUT_VSCREENINFO:
1365         case FBIOPAN_DISPLAY:
1366         case FBIOGET_CON2FBMAP:
1367         case FBIOPUT_CON2FBMAP:
1368                 arg = (unsigned long) compat_ptr(arg);
1369         case FBIOBLANK:
1370                 ret = do_fb_ioctl(info, cmd, arg);
1371                 break;
1372
1373         case FBIOGET_FSCREENINFO:
1374                 ret = fb_get_fscreeninfo(info, cmd, arg);
1375                 break;
1376
1377         case FBIOGETCMAP:
1378         case FBIOPUTCMAP:
1379                 ret = fb_getput_cmap(info, cmd, arg);
1380                 break;
1381
1382         default:
1383                 if (fb->fb_compat_ioctl)
1384                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1385                 break;
1386         }
1387         return ret;
1388 }
1389 #endif
1390
1391 static int
1392 fb_mmap(struct file *file, struct vm_area_struct * vma)
1393 {
1394         struct fb_info *info = file_fb_info(file);
1395         struct fb_ops *fb;
1396         unsigned long mmio_pgoff;
1397         unsigned long start;
1398         u32 len;
1399
1400         if (!info)
1401                 return -ENODEV;
1402         fb = info->fbops;
1403         if (!fb)
1404                 return -ENODEV;
1405         mutex_lock(&info->mm_lock);
1406         if (fb->fb_mmap) {
1407                 int res;
1408                 res = fb->fb_mmap(info, vma);
1409                 mutex_unlock(&info->mm_lock);
1410                 return res;
1411         }
1412
1413         /*
1414          * Ugh. This can be either the frame buffer mapping, or
1415          * if pgoff points past it, the mmio mapping.
1416          */
1417         start = info->fix.smem_start;
1418         len = info->fix.smem_len;
1419         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1420         if (vma->vm_pgoff >= mmio_pgoff) {
1421                 if (info->var.accel_flags) {
1422                         mutex_unlock(&info->mm_lock);
1423                         return -EINVAL;
1424                 }
1425
1426                 vma->vm_pgoff -= mmio_pgoff;
1427                 start = info->fix.mmio_start;
1428                 len = info->fix.mmio_len;
1429         }
1430         mutex_unlock(&info->mm_lock);
1431
1432         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1433         fb_pgprotect(file, vma, start);
1434
1435         return vm_iomap_memory(vma, start, len);
1436 }
1437
1438 static int
1439 fb_open(struct inode *inode, struct file *file)
1440 __acquires(&info->lock)
1441 __releases(&info->lock)
1442 {
1443         int fbidx = iminor(inode);
1444         struct fb_info *info;
1445         int res = 0;
1446
1447         info = get_fb_info(fbidx);
1448         if (!info) {
1449                 request_module("fb%d", fbidx);
1450                 info = get_fb_info(fbidx);
1451                 if (!info)
1452                         return -ENODEV;
1453         }
1454         if (IS_ERR(info))
1455                 return PTR_ERR(info);
1456
1457         mutex_lock(&info->lock);
1458         if (!try_module_get(info->fbops->owner)) {
1459                 res = -ENODEV;
1460                 goto out;
1461         }
1462         file->private_data = info;
1463         if (info->fbops->fb_open) {
1464                 res = info->fbops->fb_open(info,1);
1465                 if (res)
1466                         module_put(info->fbops->owner);
1467         }
1468 #ifdef CONFIG_FB_DEFERRED_IO
1469         if (info->fbdefio)
1470                 fb_deferred_io_open(info, inode, file);
1471 #endif
1472 out:
1473         mutex_unlock(&info->lock);
1474         if (res)
1475                 put_fb_info(info);
1476         return res;
1477 }
1478
1479 static int 
1480 fb_release(struct inode *inode, struct file *file)
1481 __acquires(&info->lock)
1482 __releases(&info->lock)
1483 {
1484         struct fb_info * const info = file->private_data;
1485
1486         mutex_lock(&info->lock);
1487         if (info->fbops->fb_release)
1488                 info->fbops->fb_release(info,1);
1489         module_put(info->fbops->owner);
1490         mutex_unlock(&info->lock);
1491         put_fb_info(info);
1492         return 0;
1493 }
1494
1495 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1496 unsigned long get_fb_unmapped_area(struct file *filp,
1497                                    unsigned long addr, unsigned long len,
1498                                    unsigned long pgoff, unsigned long flags)
1499 {
1500         struct fb_info * const info = filp->private_data;
1501         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1502
1503         if (pgoff > fb_size || len > fb_size - pgoff)
1504                 return -EINVAL;
1505
1506         return (unsigned long)info->screen_base + pgoff;
1507 }
1508 #endif
1509
1510 static const struct file_operations fb_fops = {
1511         .owner =        THIS_MODULE,
1512         .read =         fb_read,
1513         .write =        fb_write,
1514         .unlocked_ioctl = fb_ioctl,
1515 #ifdef CONFIG_COMPAT
1516         .compat_ioctl = fb_compat_ioctl,
1517 #endif
1518         .mmap =         fb_mmap,
1519         .open =         fb_open,
1520         .release =      fb_release,
1521 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1522         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1523          !defined(CONFIG_MMU))
1524         .get_unmapped_area = get_fb_unmapped_area,
1525 #endif
1526 #ifdef CONFIG_FB_DEFERRED_IO
1527         .fsync =        fb_deferred_io_fsync,
1528 #endif
1529         .llseek =       default_llseek,
1530 };
1531
1532 struct class *fb_class;
1533 EXPORT_SYMBOL(fb_class);
1534
1535 static int fb_check_foreignness(struct fb_info *fi)
1536 {
1537         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1538
1539         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1540
1541 #ifdef __BIG_ENDIAN
1542         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1543 #else
1544         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1545 #endif /* __BIG_ENDIAN */
1546
1547         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1548                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1549                        "support this framebuffer\n", fi->fix.id);
1550                 return -ENOSYS;
1551         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1552                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1553                        "support this framebuffer\n", fi->fix.id);
1554                 return -ENOSYS;
1555         }
1556
1557         return 0;
1558 }
1559
1560 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1561 {
1562         /* is the generic aperture base the same as the HW one */
1563         if (gen->base == hw->base)
1564                 return true;
1565         /* is the generic aperture base inside the hw base->hw base+size */
1566         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1567                 return true;
1568         return false;
1569 }
1570
1571 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1572                                     struct apertures_struct *hwa)
1573 {
1574         int i, j;
1575         if (!hwa || !gena)
1576                 return false;
1577
1578         for (i = 0; i < hwa->count; ++i) {
1579                 struct aperture *h = &hwa->ranges[i];
1580                 for (j = 0; j < gena->count; ++j) {
1581                         struct aperture *g = &gena->ranges[j];
1582                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1583                                 (unsigned long long)g->base,
1584                                 (unsigned long long)g->size,
1585                                 (unsigned long long)h->base,
1586                                 (unsigned long long)h->size);
1587                         if (apertures_overlap(g, h))
1588                                 return true;
1589                 }
1590         }
1591
1592         return false;
1593 }
1594
1595 static int do_unregister_framebuffer(struct fb_info *fb_info);
1596
1597 #define VGA_FB_PHYS 0xA0000
1598 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1599                                               const char *name, bool primary)
1600 {
1601         int i, ret;
1602
1603         /* check all firmware fbs and kick off if the base addr overlaps */
1604         for (i = 0 ; i < FB_MAX; i++) {
1605                 struct apertures_struct *gen_aper;
1606                 if (!registered_fb[i])
1607                         continue;
1608
1609                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1610                         continue;
1611
1612                 gen_aper = registered_fb[i]->apertures;
1613                 if (fb_do_apertures_overlap(gen_aper, a) ||
1614                         (primary && gen_aper && gen_aper->count &&
1615                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1616
1617                         printk(KERN_INFO "fb: switching to %s from %s\n",
1618                                name, registered_fb[i]->fix.id);
1619                         ret = do_unregister_framebuffer(registered_fb[i]);
1620                         if (ret)
1621                                 return ret;
1622                 }
1623         }
1624
1625         return 0;
1626 }
1627
1628 static bool lockless_register_fb;
1629 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1630 MODULE_PARM_DESC(lockless_register_fb,
1631         "Lockless framebuffer registration for debugging [default=off]");
1632
1633 static int do_register_framebuffer(struct fb_info *fb_info)
1634 {
1635         int i, ret;
1636         struct fb_event event;
1637         struct fb_videomode mode;
1638
1639         if (fb_check_foreignness(fb_info))
1640                 return -ENOSYS;
1641
1642         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1643                                                  fb_info->fix.id,
1644                                                  fb_is_primary_device(fb_info));
1645         if (ret)
1646                 return ret;
1647
1648         if (num_registered_fb == FB_MAX)
1649                 return -ENXIO;
1650
1651         num_registered_fb++;
1652         for (i = 0 ; i < FB_MAX; i++)
1653                 if (!registered_fb[i])
1654                         break;
1655         fb_info->node = i;
1656         atomic_set(&fb_info->count, 1);
1657         mutex_init(&fb_info->lock);
1658         mutex_init(&fb_info->mm_lock);
1659
1660         fb_info->dev = device_create(fb_class, fb_info->device,
1661                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1662         if (IS_ERR(fb_info->dev)) {
1663                 /* Not fatal */
1664                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1665                 fb_info->dev = NULL;
1666         } else
1667                 fb_init_device(fb_info);
1668
1669         if (fb_info->pixmap.addr == NULL) {
1670                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1671                 if (fb_info->pixmap.addr) {
1672                         fb_info->pixmap.size = FBPIXMAPSIZE;
1673                         fb_info->pixmap.buf_align = 1;
1674                         fb_info->pixmap.scan_align = 1;
1675                         fb_info->pixmap.access_align = 32;
1676                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1677                 }
1678         }       
1679         fb_info->pixmap.offset = 0;
1680
1681         if (!fb_info->pixmap.blit_x)
1682                 fb_info->pixmap.blit_x = ~(u32)0;
1683
1684         if (!fb_info->pixmap.blit_y)
1685                 fb_info->pixmap.blit_y = ~(u32)0;
1686
1687         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1688                 INIT_LIST_HEAD(&fb_info->modelist);
1689
1690         if (fb_info->skip_vt_switch)
1691                 pm_vt_switch_required(fb_info->dev, false);
1692         else
1693                 pm_vt_switch_required(fb_info->dev, true);
1694
1695         fb_var_to_videomode(&mode, &fb_info->var);
1696         fb_add_videomode(&mode, &fb_info->modelist);
1697         registered_fb[i] = fb_info;
1698
1699         event.info = fb_info;
1700         if (!lockless_register_fb)
1701                 console_lock();
1702         if (!lock_fb_info(fb_info)) {
1703                 if (!lockless_register_fb)
1704                         console_unlock();
1705                 return -ENODEV;
1706         }
1707
1708         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1709         unlock_fb_info(fb_info);
1710         if (!lockless_register_fb)
1711                 console_unlock();
1712         return 0;
1713 }
1714
1715 static int do_unregister_framebuffer(struct fb_info *fb_info)
1716 {
1717         struct fb_event event;
1718         int i, ret = 0;
1719
1720         i = fb_info->node;
1721         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1722                 return -EINVAL;
1723
1724         console_lock();
1725         if (!lock_fb_info(fb_info)) {
1726                 console_unlock();
1727                 return -ENODEV;
1728         }
1729
1730         event.info = fb_info;
1731         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1732         unlock_fb_info(fb_info);
1733         console_unlock();
1734
1735         if (ret)
1736                 return -EINVAL;
1737
1738         pm_vt_switch_unregister(fb_info->dev);
1739
1740         unlink_framebuffer(fb_info);
1741         if (fb_info->pixmap.addr &&
1742             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1743                 kfree(fb_info->pixmap.addr);
1744         fb_destroy_modelist(&fb_info->modelist);
1745         registered_fb[i] = NULL;
1746         num_registered_fb--;
1747         fb_cleanup_device(fb_info);
1748         event.info = fb_info;
1749         console_lock();
1750         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1751         console_unlock();
1752
1753         /* this may free fb info */
1754         put_fb_info(fb_info);
1755         return 0;
1756 }
1757
1758 int unlink_framebuffer(struct fb_info *fb_info)
1759 {
1760         int i;
1761
1762         i = fb_info->node;
1763         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1764                 return -EINVAL;
1765
1766         if (fb_info->dev) {
1767                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1768                 fb_info->dev = NULL;
1769         }
1770         return 0;
1771 }
1772 EXPORT_SYMBOL(unlink_framebuffer);
1773
1774 int remove_conflicting_framebuffers(struct apertures_struct *a,
1775                                     const char *name, bool primary)
1776 {
1777         int ret;
1778
1779         mutex_lock(&registration_lock);
1780         ret = do_remove_conflicting_framebuffers(a, name, primary);
1781         mutex_unlock(&registration_lock);
1782
1783         return ret;
1784 }
1785 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1786
1787 /**
1788  *      register_framebuffer - registers a frame buffer device
1789  *      @fb_info: frame buffer info structure
1790  *
1791  *      Registers a frame buffer device @fb_info.
1792  *
1793  *      Returns negative errno on error, or zero for success.
1794  *
1795  */
1796 int
1797 register_framebuffer(struct fb_info *fb_info)
1798 {
1799         int ret;
1800
1801         mutex_lock(&registration_lock);
1802         ret = do_register_framebuffer(fb_info);
1803         mutex_unlock(&registration_lock);
1804
1805         return ret;
1806 }
1807 EXPORT_SYMBOL(register_framebuffer);
1808
1809 /**
1810  *      unregister_framebuffer - releases a frame buffer device
1811  *      @fb_info: frame buffer info structure
1812  *
1813  *      Unregisters a frame buffer device @fb_info.
1814  *
1815  *      Returns negative errno on error, or zero for success.
1816  *
1817  *      This function will also notify the framebuffer console
1818  *      to release the driver.
1819  *
1820  *      This is meant to be called within a driver's module_exit()
1821  *      function. If this is called outside module_exit(), ensure
1822  *      that the driver implements fb_open() and fb_release() to
1823  *      check that no processes are using the device.
1824  */
1825 int
1826 unregister_framebuffer(struct fb_info *fb_info)
1827 {
1828         int ret;
1829
1830         mutex_lock(&registration_lock);
1831         ret = do_unregister_framebuffer(fb_info);
1832         mutex_unlock(&registration_lock);
1833
1834         return ret;
1835 }
1836 EXPORT_SYMBOL(unregister_framebuffer);
1837
1838 /**
1839  *      fb_set_suspend - low level driver signals suspend
1840  *      @info: framebuffer affected
1841  *      @state: 0 = resuming, !=0 = suspending
1842  *
1843  *      This is meant to be used by low level drivers to
1844  *      signal suspend/resume to the core & clients.
1845  *      It must be called with the console semaphore held
1846  */
1847 void fb_set_suspend(struct fb_info *info, int state)
1848 {
1849         struct fb_event event;
1850
1851         event.info = info;
1852         if (state) {
1853                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1854                 info->state = FBINFO_STATE_SUSPENDED;
1855         } else {
1856                 info->state = FBINFO_STATE_RUNNING;
1857                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1858         }
1859 }
1860 EXPORT_SYMBOL(fb_set_suspend);
1861
1862 /**
1863  *      fbmem_init - init frame buffer subsystem
1864  *
1865  *      Initialize the frame buffer subsystem.
1866  *
1867  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1868  *
1869  */
1870
1871 static int __init
1872 fbmem_init(void)
1873 {
1874         int ret;
1875
1876         if (!proc_create("fb", 0, NULL, &fb_proc_fops))
1877                 return -ENOMEM;
1878
1879         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1880         if (ret) {
1881                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1882                 goto err_chrdev;
1883         }
1884
1885         fb_class = class_create(THIS_MODULE, "graphics");
1886         if (IS_ERR(fb_class)) {
1887                 ret = PTR_ERR(fb_class);
1888                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1889                 fb_class = NULL;
1890                 goto err_class;
1891         }
1892         return 0;
1893
1894 err_class:
1895         unregister_chrdev(FB_MAJOR, "fb");
1896 err_chrdev:
1897         remove_proc_entry("fb", NULL);
1898         return ret;
1899 }
1900
1901 #ifdef MODULE
1902 module_init(fbmem_init);
1903 static void __exit
1904 fbmem_exit(void)
1905 {
1906         remove_proc_entry("fb", NULL);
1907         class_destroy(fb_class);
1908         unregister_chrdev(FB_MAJOR, "fb");
1909 }
1910
1911 module_exit(fbmem_exit);
1912 MODULE_LICENSE("GPL");
1913 MODULE_DESCRIPTION("Framebuffer base");
1914 #else
1915 subsys_initcall(fbmem_init);
1916 #endif
1917
1918 int fb_new_modelist(struct fb_info *info)
1919 {
1920         struct fb_event event;
1921         struct fb_var_screeninfo var = info->var;
1922         struct list_head *pos, *n;
1923         struct fb_modelist *modelist;
1924         struct fb_videomode *m, mode;
1925         int err = 1;
1926
1927         list_for_each_safe(pos, n, &info->modelist) {
1928                 modelist = list_entry(pos, struct fb_modelist, list);
1929                 m = &modelist->mode;
1930                 fb_videomode_to_var(&var, m);
1931                 var.activate = FB_ACTIVATE_TEST;
1932                 err = fb_set_var(info, &var);
1933                 fb_var_to_videomode(&mode, &var);
1934                 if (err || !fb_mode_is_equal(m, &mode)) {
1935                         list_del(pos);
1936                         kfree(pos);
1937                 }
1938         }
1939
1940         err = 1;
1941
1942         if (!list_empty(&info->modelist)) {
1943                 event.info = info;
1944                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1945         }
1946
1947         return err;
1948 }
1949
1950 MODULE_LICENSE("GPL");