fb: Reduce priority of resource conflict message
[linux-2.6.git] / drivers / video / fbmem.c
1 /*
2  *  linux/drivers/video/fbmem.c
3  *
4  *  Copyright (C) 1994 Martin Schaller
5  *
6  *      2001 - Documented with DocBook
7  *      - Brad Douglas <brad@neruo.com>
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive
11  * for more details.
12  */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/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 struct fb_info *registered_fb[FB_MAX] __read_mostly;
46 int num_registered_fb __read_mostly;
47
48 int lock_fb_info(struct fb_info *info)
49 {
50         mutex_lock(&info->lock);
51         if (!info->fbops) {
52                 mutex_unlock(&info->lock);
53                 return 0;
54         }
55         return 1;
56 }
57 EXPORT_SYMBOL(lock_fb_info);
58
59 /*
60  * Helpers
61  */
62
63 int fb_get_color_depth(struct fb_var_screeninfo *var,
64                        struct fb_fix_screeninfo *fix)
65 {
66         int depth = 0;
67
68         if (fix->visual == FB_VISUAL_MONO01 ||
69             fix->visual == FB_VISUAL_MONO10)
70                 depth = 1;
71         else {
72                 if (var->green.length == var->blue.length &&
73                     var->green.length == var->red.length &&
74                     var->green.offset == var->blue.offset &&
75                     var->green.offset == var->red.offset)
76                         depth = var->green.length;
77                 else
78                         depth = var->green.length + var->red.length +
79                                 var->blue.length;
80         }
81
82         return depth;
83 }
84 EXPORT_SYMBOL(fb_get_color_depth);
85
86 /*
87  * Data padding functions.
88  */
89 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
90 {
91         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
92 }
93 EXPORT_SYMBOL(fb_pad_aligned_buffer);
94
95 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
96                                 u32 shift_high, u32 shift_low, u32 mod)
97 {
98         u8 mask = (u8) (0xfff << shift_high), tmp;
99         int i, j;
100
101         for (i = height; i--; ) {
102                 for (j = 0; j < idx; j++) {
103                         tmp = dst[j];
104                         tmp &= mask;
105                         tmp |= *src >> shift_low;
106                         dst[j] = tmp;
107                         tmp = *src << shift_high;
108                         dst[j+1] = tmp;
109                         src++;
110                 }
111                 tmp = dst[idx];
112                 tmp &= mask;
113                 tmp |= *src >> shift_low;
114                 dst[idx] = tmp;
115                 if (shift_high < mod) {
116                         tmp = *src << shift_high;
117                         dst[idx+1] = tmp;
118                 }
119                 src++;
120                 dst += d_pitch;
121         }
122 }
123 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
124
125 /*
126  * we need to lock this section since fb_cursor
127  * may use fb_imageblit()
128  */
129 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
130 {
131         u32 align = buf->buf_align - 1, offset;
132         char *addr = buf->addr;
133
134         /* If IO mapped, we need to sync before access, no sharing of
135          * the pixmap is done
136          */
137         if (buf->flags & FB_PIXMAP_IO) {
138                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
139                         info->fbops->fb_sync(info);
140                 return addr;
141         }
142
143         /* See if we fit in the remaining pixmap space */
144         offset = buf->offset + align;
145         offset &= ~align;
146         if (offset + size > buf->size) {
147                 /* We do not fit. In order to be able to re-use the buffer,
148                  * we must ensure no asynchronous DMA'ing or whatever operation
149                  * is in progress, we sync for that.
150                  */
151                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
152                         info->fbops->fb_sync(info);
153                 offset = 0;
154         }
155         buf->offset = offset + size;
156         addr += offset;
157
158         return addr;
159 }
160
161 #ifdef CONFIG_LOGO
162
163 static inline unsigned safe_shift(unsigned d, int n)
164 {
165         return n < 0 ? d >> -n : d << n;
166 }
167
168 static void fb_set_logocmap(struct fb_info *info,
169                                    const struct linux_logo *logo)
170 {
171         struct fb_cmap palette_cmap;
172         u16 palette_green[16];
173         u16 palette_blue[16];
174         u16 palette_red[16];
175         int i, j, n;
176         const unsigned char *clut = logo->clut;
177
178         palette_cmap.start = 0;
179         palette_cmap.len = 16;
180         palette_cmap.red = palette_red;
181         palette_cmap.green = palette_green;
182         palette_cmap.blue = palette_blue;
183         palette_cmap.transp = NULL;
184
185         for (i = 0; i < logo->clutsize; i += n) {
186                 n = logo->clutsize - i;
187                 /* palette_cmap provides space for only 16 colors at once */
188                 if (n > 16)
189                         n = 16;
190                 palette_cmap.start = 32 + i;
191                 palette_cmap.len = n;
192                 for (j = 0; j < n; ++j) {
193                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
194                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
195                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
196                         clut += 3;
197                 }
198                 fb_set_cmap(&palette_cmap, info);
199         }
200 }
201
202 static void  fb_set_logo_truepalette(struct fb_info *info,
203                                             const struct linux_logo *logo,
204                                             u32 *palette)
205 {
206         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
207         unsigned char redmask, greenmask, bluemask;
208         int redshift, greenshift, blueshift;
209         int i;
210         const unsigned char *clut = logo->clut;
211
212         /*
213          * We have to create a temporary palette since console palette is only
214          * 16 colors long.
215          */
216         /* Bug: Doesn't obey msb_right ... (who needs that?) */
217         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
218         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
219         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
220         redshift   = info->var.red.offset   - (8 - info->var.red.length);
221         greenshift = info->var.green.offset - (8 - info->var.green.length);
222         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
223
224         for ( i = 0; i < logo->clutsize; i++) {
225                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
226                                  safe_shift((clut[1] & greenmask), greenshift) |
227                                  safe_shift((clut[2] & bluemask), blueshift));
228                 clut += 3;
229         }
230 }
231
232 static void fb_set_logo_directpalette(struct fb_info *info,
233                                              const struct linux_logo *logo,
234                                              u32 *palette)
235 {
236         int redshift, greenshift, blueshift;
237         int i;
238
239         redshift = info->var.red.offset;
240         greenshift = info->var.green.offset;
241         blueshift = info->var.blue.offset;
242
243         for (i = 32; i < 32 + logo->clutsize; i++)
244                 palette[i] = i << redshift | i << greenshift | i << blueshift;
245 }
246
247 static void fb_set_logo(struct fb_info *info,
248                                const struct linux_logo *logo, u8 *dst,
249                                int depth)
250 {
251         int i, j, k;
252         const u8 *src = logo->data;
253         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
254         u8 fg = 1, d;
255
256         switch (fb_get_color_depth(&info->var, &info->fix)) {
257         case 1:
258                 fg = 1;
259                 break;
260         case 2:
261                 fg = 3;
262                 break;
263         default:
264                 fg = 7;
265                 break;
266         }
267
268         if (info->fix.visual == FB_VISUAL_MONO01 ||
269             info->fix.visual == FB_VISUAL_MONO10)
270                 fg = ~((u8) (0xfff << info->var.green.length));
271
272         switch (depth) {
273         case 4:
274                 for (i = 0; i < logo->height; i++)
275                         for (j = 0; j < logo->width; src++) {
276                                 *dst++ = *src >> 4;
277                                 j++;
278                                 if (j < logo->width) {
279                                         *dst++ = *src & 0x0f;
280                                         j++;
281                                 }
282                         }
283                 break;
284         case 1:
285                 for (i = 0; i < logo->height; i++) {
286                         for (j = 0; j < logo->width; src++) {
287                                 d = *src ^ xor;
288                                 for (k = 7; k >= 0; k--) {
289                                         *dst++ = ((d >> k) & 1) ? fg : 0;
290                                         j++;
291                                 }
292                         }
293                 }
294                 break;
295         }
296 }
297
298 /*
299  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
300  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
301  * the visual format and color depth of the framebuffer, the DAC, the
302  * pseudo_palette, and the logo data will be adjusted accordingly.
303  *
304  * Case 1 - linux_logo_clut224:
305  * Color exceeds the number of console colors (16), thus we set the hardware DAC
306  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
307  *
308  * For visuals that require color info from the pseudo_palette, we also construct
309  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
310  * will be set.
311  *
312  * Case 2 - linux_logo_vga16:
313  * The number of colors just matches the console colors, thus there is no need
314  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
315  * each byte contains color information for two pixels (upper and lower nibble).
316  * To be consistent with fb_imageblit() usage, we therefore separate the two
317  * nibbles into separate bytes. The "depth" flag will be set to 4.
318  *
319  * Case 3 - linux_logo_mono:
320  * This is similar with Case 2.  Each byte contains information for 8 pixels.
321  * We isolate each bit and expand each into a byte. The "depth" flag will
322  * be set to 1.
323  */
324 static struct logo_data {
325         int depth;
326         int needs_directpalette;
327         int needs_truepalette;
328         int needs_cmapreset;
329         const struct linux_logo *logo;
330 } fb_logo __read_mostly;
331
332 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334         u32 size = width * height, i;
335
336         out += size - 1;
337
338         for (i = size; i--; )
339                 *out-- = *in++;
340 }
341
342 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
343 {
344         int i, j, h = height - 1;
345
346         for (i = 0; i < height; i++)
347                 for (j = 0; j < width; j++)
348                                 out[height * j + h - i] = *in++;
349 }
350
351 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
352 {
353         int i, j, w = width - 1;
354
355         for (i = 0; i < height; i++)
356                 for (j = 0; j < width; j++)
357                         out[height * (w - j) + i] = *in++;
358 }
359
360 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
361                            struct fb_image *image, int rotate)
362 {
363         u32 tmp;
364
365         if (rotate == FB_ROTATE_UD) {
366                 fb_rotate_logo_ud(image->data, dst, image->width,
367                                   image->height);
368                 image->dx = info->var.xres - image->width - image->dx;
369                 image->dy = info->var.yres - image->height - image->dy;
370         } else if (rotate == FB_ROTATE_CW) {
371                 fb_rotate_logo_cw(image->data, dst, image->width,
372                                   image->height);
373                 tmp = image->width;
374                 image->width = image->height;
375                 image->height = tmp;
376                 tmp = image->dy;
377                 image->dy = image->dx;
378                 image->dx = info->var.xres - image->width - tmp;
379         } else if (rotate == FB_ROTATE_CCW) {
380                 fb_rotate_logo_ccw(image->data, dst, image->width,
381                                    image->height);
382                 tmp = image->width;
383                 image->width = image->height;
384                 image->height = tmp;
385                 tmp = image->dx;
386                 image->dx = image->dy;
387                 image->dy = info->var.yres - image->height - tmp;
388         }
389
390         image->data = dst;
391 }
392
393 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
394                             int rotate, unsigned int num)
395 {
396         unsigned int x;
397
398         if (rotate == FB_ROTATE_UR) {
399                 for (x = 0;
400                      x < num && image->dx + image->width <= info->var.xres;
401                      x++) {
402                         info->fbops->fb_imageblit(info, image);
403                         image->dx += image->width + 8;
404                 }
405         } else if (rotate == FB_ROTATE_UD) {
406                 for (x = 0; x < num && image->dx >= 0; x++) {
407                         info->fbops->fb_imageblit(info, image);
408                         image->dx -= image->width + 8;
409                 }
410         } else if (rotate == FB_ROTATE_CW) {
411                 for (x = 0;
412                      x < num && image->dy + image->height <= info->var.yres;
413                      x++) {
414                         info->fbops->fb_imageblit(info, image);
415                         image->dy += image->height + 8;
416                 }
417         } else if (rotate == FB_ROTATE_CCW) {
418                 for (x = 0; x < num && image->dy >= 0; x++) {
419                         info->fbops->fb_imageblit(info, image);
420                         image->dy -= image->height + 8;
421                 }
422         }
423 }
424
425 static int fb_show_logo_line(struct fb_info *info, int rotate,
426                              const struct linux_logo *logo, int y,
427                              unsigned int n)
428 {
429         u32 *palette = NULL, *saved_pseudo_palette = NULL;
430         unsigned char *logo_new = NULL, *logo_rotate = NULL;
431         struct fb_image image;
432
433         /* Return if the frame buffer is not mapped or suspended */
434         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
435             info->flags & FBINFO_MODULE)
436                 return 0;
437
438         image.depth = 8;
439         image.data = logo->data;
440
441         if (fb_logo.needs_cmapreset)
442                 fb_set_logocmap(info, logo);
443
444         if (fb_logo.needs_truepalette ||
445             fb_logo.needs_directpalette) {
446                 palette = kmalloc(256 * 4, GFP_KERNEL);
447                 if (palette == NULL)
448                         return 0;
449
450                 if (fb_logo.needs_truepalette)
451                         fb_set_logo_truepalette(info, logo, palette);
452                 else
453                         fb_set_logo_directpalette(info, logo, palette);
454
455                 saved_pseudo_palette = info->pseudo_palette;
456                 info->pseudo_palette = palette;
457         }
458
459         if (fb_logo.depth <= 4) {
460                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
461                 if (logo_new == NULL) {
462                         kfree(palette);
463                         if (saved_pseudo_palette)
464                                 info->pseudo_palette = saved_pseudo_palette;
465                         return 0;
466                 }
467                 image.data = logo_new;
468                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
469         }
470
471         image.dx = 0;
472         image.dy = y;
473         image.width = logo->width;
474         image.height = logo->height;
475
476         if (rotate) {
477                 logo_rotate = kmalloc(logo->width *
478                                       logo->height, GFP_KERNEL);
479                 if (logo_rotate)
480                         fb_rotate_logo(info, logo_rotate, &image, rotate);
481         }
482
483         fb_do_show_logo(info, &image, rotate, n);
484
485         kfree(palette);
486         if (saved_pseudo_palette != NULL)
487                 info->pseudo_palette = saved_pseudo_palette;
488         kfree(logo_new);
489         kfree(logo_rotate);
490         return logo->height;
491 }
492
493
494 #ifdef CONFIG_FB_LOGO_EXTRA
495
496 #define FB_LOGO_EX_NUM_MAX 10
497 static struct logo_data_extra {
498         const struct linux_logo *logo;
499         unsigned int n;
500 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
501 static unsigned int fb_logo_ex_num;
502
503 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
504 {
505         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
506                 return;
507
508         fb_logo_ex[fb_logo_ex_num].logo = logo;
509         fb_logo_ex[fb_logo_ex_num].n = n;
510         fb_logo_ex_num++;
511 }
512
513 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
514                                   unsigned int yres)
515 {
516         unsigned int i;
517
518         /* FIXME: logo_ex supports only truecolor fb. */
519         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
520                 fb_logo_ex_num = 0;
521
522         for (i = 0; i < fb_logo_ex_num; i++) {
523                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
524                         fb_logo_ex[i].logo = NULL;
525                         continue;
526                 }
527                 height += fb_logo_ex[i].logo->height;
528                 if (height > yres) {
529                         height -= fb_logo_ex[i].logo->height;
530                         fb_logo_ex_num = i;
531                         break;
532                 }
533         }
534         return height;
535 }
536
537 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
538 {
539         unsigned int i;
540
541         for (i = 0; i < fb_logo_ex_num; i++)
542                 y += fb_show_logo_line(info, rotate,
543                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
544
545         return y;
546 }
547
548 #else /* !CONFIG_FB_LOGO_EXTRA */
549
550 static inline int fb_prepare_extra_logos(struct fb_info *info,
551                                          unsigned int height,
552                                          unsigned int yres)
553 {
554         return height;
555 }
556
557 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
558 {
559         return y;
560 }
561
562 #endif /* CONFIG_FB_LOGO_EXTRA */
563
564
565 int fb_prepare_logo(struct fb_info *info, int rotate)
566 {
567         int depth = fb_get_color_depth(&info->var, &info->fix);
568         unsigned int yres;
569
570         memset(&fb_logo, 0, sizeof(struct logo_data));
571
572         if (info->flags & FBINFO_MISC_TILEBLITTING ||
573             info->flags & FBINFO_MODULE)
574                 return 0;
575
576         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
577                 depth = info->var.blue.length;
578                 if (info->var.red.length < depth)
579                         depth = info->var.red.length;
580                 if (info->var.green.length < depth)
581                         depth = info->var.green.length;
582         }
583
584         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
585                 /* assume console colormap */
586                 depth = 4;
587         }
588
589         /* Return if no suitable logo was found */
590         fb_logo.logo = fb_find_logo(depth);
591
592         if (!fb_logo.logo) {
593                 return 0;
594         }
595
596         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
597                 yres = info->var.yres;
598         else
599                 yres = info->var.xres;
600
601         if (fb_logo.logo->height > yres) {
602                 fb_logo.logo = NULL;
603                 return 0;
604         }
605
606         /* What depth we asked for might be different from what we get */
607         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
608                 fb_logo.depth = 8;
609         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
610                 fb_logo.depth = 4;
611         else
612                 fb_logo.depth = 1;
613
614
615         if (fb_logo.depth > 4 && depth > 4) {
616                 switch (info->fix.visual) {
617                 case FB_VISUAL_TRUECOLOR:
618                         fb_logo.needs_truepalette = 1;
619                         break;
620                 case FB_VISUAL_DIRECTCOLOR:
621                         fb_logo.needs_directpalette = 1;
622                         fb_logo.needs_cmapreset = 1;
623                         break;
624                 case FB_VISUAL_PSEUDOCOLOR:
625                         fb_logo.needs_cmapreset = 1;
626                         break;
627                 }
628         }
629
630         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
631 }
632
633 int fb_show_logo(struct fb_info *info, int rotate)
634 {
635         int y;
636
637         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
638                               num_online_cpus());
639         y = fb_show_extra_logos(info, y, rotate);
640
641         return y;
642 }
643 #else
644 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
645 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
646 #endif /* CONFIG_LOGO */
647
648 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
649 {
650         return (*pos < FB_MAX) ? pos : NULL;
651 }
652
653 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
654 {
655         (*pos)++;
656         return (*pos < FB_MAX) ? pos : NULL;
657 }
658
659 static void fb_seq_stop(struct seq_file *m, void *v)
660 {
661 }
662
663 static int fb_seq_show(struct seq_file *m, void *v)
664 {
665         int i = *(loff_t *)v;
666         struct fb_info *fi = registered_fb[i];
667
668         if (fi)
669                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
670         return 0;
671 }
672
673 static const struct seq_operations proc_fb_seq_ops = {
674         .start  = fb_seq_start,
675         .next   = fb_seq_next,
676         .stop   = fb_seq_stop,
677         .show   = fb_seq_show,
678 };
679
680 static int proc_fb_open(struct inode *inode, struct file *file)
681 {
682         return seq_open(file, &proc_fb_seq_ops);
683 }
684
685 static const struct file_operations fb_proc_fops = {
686         .owner          = THIS_MODULE,
687         .open           = proc_fb_open,
688         .read           = seq_read,
689         .llseek         = seq_lseek,
690         .release        = seq_release,
691 };
692
693 static ssize_t
694 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
695 {
696         unsigned long p = *ppos;
697         struct inode *inode = file->f_path.dentry->d_inode;
698         int fbidx = iminor(inode);
699         struct fb_info *info = registered_fb[fbidx];
700         u8 *buffer, *dst;
701         u8 __iomem *src;
702         int c, cnt = 0, err = 0;
703         unsigned long total_size;
704
705         if (!info || ! info->screen_base)
706                 return -ENODEV;
707
708         if (info->state != FBINFO_STATE_RUNNING)
709                 return -EPERM;
710
711         if (info->fbops->fb_read)
712                 return info->fbops->fb_read(info, buf, count, ppos);
713         
714         total_size = info->screen_size;
715
716         if (total_size == 0)
717                 total_size = info->fix.smem_len;
718
719         if (p >= total_size)
720                 return 0;
721
722         if (count >= total_size)
723                 count = total_size;
724
725         if (count + p > total_size)
726                 count = total_size - p;
727
728         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
729                          GFP_KERNEL);
730         if (!buffer)
731                 return -ENOMEM;
732
733         src = (u8 __iomem *) (info->screen_base + p);
734
735         if (info->fbops->fb_sync)
736                 info->fbops->fb_sync(info);
737
738         while (count) {
739                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
740                 dst = buffer;
741                 fb_memcpy_fromfb(dst, src, c);
742                 dst += c;
743                 src += c;
744
745                 if (copy_to_user(buf, buffer, c)) {
746                         err = -EFAULT;
747                         break;
748                 }
749                 *ppos += c;
750                 buf += c;
751                 cnt += c;
752                 count -= c;
753         }
754
755         kfree(buffer);
756
757         return (err) ? err : cnt;
758 }
759
760 static ssize_t
761 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
762 {
763         unsigned long p = *ppos;
764         struct inode *inode = file->f_path.dentry->d_inode;
765         int fbidx = iminor(inode);
766         struct fb_info *info = registered_fb[fbidx];
767         u8 *buffer, *src;
768         u8 __iomem *dst;
769         int c, cnt = 0, err = 0;
770         unsigned long total_size;
771
772         if (!info || !info->screen_base)
773                 return -ENODEV;
774
775         if (info->state != FBINFO_STATE_RUNNING)
776                 return -EPERM;
777
778         if (info->fbops->fb_write)
779                 return info->fbops->fb_write(info, buf, count, ppos);
780         
781         total_size = info->screen_size;
782
783         if (total_size == 0)
784                 total_size = info->fix.smem_len;
785
786         if (p > total_size)
787                 return -EFBIG;
788
789         if (count > total_size) {
790                 err = -EFBIG;
791                 count = total_size;
792         }
793
794         if (count + p > total_size) {
795                 if (!err)
796                         err = -ENOSPC;
797
798                 count = total_size - p;
799         }
800
801         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
802                          GFP_KERNEL);
803         if (!buffer)
804                 return -ENOMEM;
805
806         dst = (u8 __iomem *) (info->screen_base + p);
807
808         if (info->fbops->fb_sync)
809                 info->fbops->fb_sync(info);
810
811         while (count) {
812                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
813                 src = buffer;
814
815                 if (copy_from_user(src, buf, c)) {
816                         err = -EFAULT;
817                         break;
818                 }
819
820                 fb_memcpy_tofb(dst, src, c);
821                 dst += c;
822                 src += c;
823                 *ppos += c;
824                 buf += c;
825                 cnt += c;
826                 count -= c;
827         }
828
829         kfree(buffer);
830
831         return (cnt) ? cnt : err;
832 }
833
834 int
835 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
836 {
837         struct fb_fix_screeninfo *fix = &info->fix;
838         unsigned int yres = info->var.yres;
839         int err = 0;
840
841         if (var->yoffset > 0) {
842                 if (var->vmode & FB_VMODE_YWRAP) {
843                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
844                                 err = -EINVAL;
845                         else
846                                 yres = 0;
847                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
848                         err = -EINVAL;
849         }
850
851         if (var->xoffset > 0 && (!fix->xpanstep ||
852                                  (var->xoffset % fix->xpanstep)))
853                 err = -EINVAL;
854
855         if (err || !info->fbops->fb_pan_display ||
856             var->yoffset > info->var.yres_virtual - yres ||
857             var->xoffset > info->var.xres_virtual - info->var.xres)
858                 return -EINVAL;
859
860         if ((err = info->fbops->fb_pan_display(var, info)))
861                 return err;
862         info->var.xoffset = var->xoffset;
863         info->var.yoffset = var->yoffset;
864         if (var->vmode & FB_VMODE_YWRAP)
865                 info->var.vmode |= FB_VMODE_YWRAP;
866         else
867                 info->var.vmode &= ~FB_VMODE_YWRAP;
868         return 0;
869 }
870
871 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
872                          u32 activate)
873 {
874         struct fb_event event;
875         struct fb_blit_caps caps, fbcaps;
876         int err = 0;
877
878         memset(&caps, 0, sizeof(caps));
879         memset(&fbcaps, 0, sizeof(fbcaps));
880         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
881         event.info = info;
882         event.data = &caps;
883         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
884         info->fbops->fb_get_caps(info, &fbcaps, var);
885
886         if (((fbcaps.x ^ caps.x) & caps.x) ||
887             ((fbcaps.y ^ caps.y) & caps.y) ||
888             (fbcaps.len < caps.len))
889                 err = -EINVAL;
890
891         return err;
892 }
893
894 int
895 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
896 {
897         int flags = info->flags;
898         int ret = 0;
899
900         if (var->activate & FB_ACTIVATE_INV_MODE) {
901                 struct fb_videomode mode1, mode2;
902
903                 fb_var_to_videomode(&mode1, var);
904                 fb_var_to_videomode(&mode2, &info->var);
905                 /* make sure we don't delete the videomode of current var */
906                 ret = fb_mode_is_equal(&mode1, &mode2);
907
908                 if (!ret) {
909                     struct fb_event event;
910
911                     event.info = info;
912                     event.data = &mode1;
913                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
914                 }
915
916                 if (!ret)
917                     fb_delete_videomode(&mode1, &info->modelist);
918
919
920                 ret = (ret) ? -EINVAL : 0;
921                 goto done;
922         }
923
924         if ((var->activate & FB_ACTIVATE_FORCE) ||
925             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
926                 u32 activate = var->activate;
927
928                 if (!info->fbops->fb_check_var) {
929                         *var = info->var;
930                         goto done;
931                 }
932
933                 ret = info->fbops->fb_check_var(var, info);
934
935                 if (ret)
936                         goto done;
937
938                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
939                         struct fb_var_screeninfo old_var;
940                         struct fb_videomode mode;
941
942                         if (info->fbops->fb_get_caps) {
943                                 ret = fb_check_caps(info, var, activate);
944
945                                 if (ret)
946                                         goto done;
947                         }
948
949                         old_var = info->var;
950                         info->var = *var;
951
952                         if (info->fbops->fb_set_par) {
953                                 ret = info->fbops->fb_set_par(info);
954
955                                 if (ret) {
956                                         info->var = old_var;
957                                         printk(KERN_WARNING "detected "
958                                                 "fb_set_par error, "
959                                                 "error code: %d\n", ret);
960                                         goto done;
961                                 }
962                         }
963
964                         fb_pan_display(info, &info->var);
965                         fb_set_cmap(&info->cmap, info);
966                         fb_var_to_videomode(&mode, &info->var);
967
968                         if (info->modelist.prev && info->modelist.next &&
969                             !list_empty(&info->modelist))
970                                 ret = fb_add_videomode(&mode, &info->modelist);
971
972                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
973                                 struct fb_event event;
974                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
975                                         FB_EVENT_MODE_CHANGE_ALL :
976                                         FB_EVENT_MODE_CHANGE;
977
978                                 info->flags &= ~FBINFO_MISC_USEREVENT;
979                                 event.info = info;
980                                 event.data = &mode;
981                                 fb_notifier_call_chain(evnt, &event);
982                         }
983                 }
984         }
985
986  done:
987         return ret;
988 }
989
990 int
991 fb_blank(struct fb_info *info, int blank)
992 {       
993         int ret = -EINVAL;
994
995         if (blank > FB_BLANK_POWERDOWN)
996                 blank = FB_BLANK_POWERDOWN;
997
998         if (info->fbops->fb_blank)
999                 ret = info->fbops->fb_blank(blank, info);
1000
1001         if (!ret) {
1002                 struct fb_event event;
1003
1004                 event.info = info;
1005                 event.data = &blank;
1006                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1007         }
1008
1009         return ret;
1010 }
1011
1012 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1013                         unsigned long arg)
1014 {
1015         struct fb_ops *fb;
1016         struct fb_var_screeninfo var;
1017         struct fb_fix_screeninfo fix;
1018         struct fb_con2fbmap con2fb;
1019         struct fb_cmap cmap_from;
1020         struct fb_cmap_user cmap;
1021         struct fb_event event;
1022         void __user *argp = (void __user *)arg;
1023         long ret = 0;
1024
1025         switch (cmd) {
1026         case FBIOGET_VSCREENINFO:
1027                 if (!lock_fb_info(info))
1028                         return -ENODEV;
1029                 var = info->var;
1030                 unlock_fb_info(info);
1031
1032                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1033                 break;
1034         case FBIOPUT_VSCREENINFO:
1035                 if (copy_from_user(&var, argp, sizeof(var)))
1036                         return -EFAULT;
1037                 if (!lock_fb_info(info))
1038                         return -ENODEV;
1039                 console_lock();
1040                 info->flags |= FBINFO_MISC_USEREVENT;
1041                 ret = fb_set_var(info, &var);
1042                 info->flags &= ~FBINFO_MISC_USEREVENT;
1043                 console_unlock();
1044                 unlock_fb_info(info);
1045                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1046                         ret = -EFAULT;
1047                 break;
1048         case FBIOGET_FSCREENINFO:
1049                 if (!lock_fb_info(info))
1050                         return -ENODEV;
1051                 fix = info->fix;
1052                 unlock_fb_info(info);
1053
1054                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1055                 break;
1056         case FBIOPUTCMAP:
1057                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1058                         return -EFAULT;
1059                 ret = fb_set_user_cmap(&cmap, info);
1060                 break;
1061         case FBIOGETCMAP:
1062                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1063                         return -EFAULT;
1064                 if (!lock_fb_info(info))
1065                         return -ENODEV;
1066                 cmap_from = info->cmap;
1067                 unlock_fb_info(info);
1068                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1069                 break;
1070         case FBIOPAN_DISPLAY:
1071                 if (copy_from_user(&var, argp, sizeof(var)))
1072                         return -EFAULT;
1073                 if (!lock_fb_info(info))
1074                         return -ENODEV;
1075                 console_lock();
1076                 ret = fb_pan_display(info, &var);
1077                 console_unlock();
1078                 unlock_fb_info(info);
1079                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1080                         return -EFAULT;
1081                 break;
1082         case FBIO_CURSOR:
1083                 ret = -EINVAL;
1084                 break;
1085         case FBIOGET_CON2FBMAP:
1086                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1087                         return -EFAULT;
1088                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1089                         return -EINVAL;
1090                 con2fb.framebuffer = -1;
1091                 event.data = &con2fb;
1092                 if (!lock_fb_info(info))
1093                         return -ENODEV;
1094                 event.info = info;
1095                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1096                 unlock_fb_info(info);
1097                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1098                 break;
1099         case FBIOPUT_CON2FBMAP:
1100                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1101                         return -EFAULT;
1102                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1103                         return -EINVAL;
1104                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1105                         return -EINVAL;
1106                 if (!registered_fb[con2fb.framebuffer])
1107                         request_module("fb%d", con2fb.framebuffer);
1108                 if (!registered_fb[con2fb.framebuffer]) {
1109                         ret = -EINVAL;
1110                         break;
1111                 }
1112                 event.data = &con2fb;
1113                 if (!lock_fb_info(info))
1114                         return -ENODEV;
1115                 event.info = info;
1116                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1117                 unlock_fb_info(info);
1118                 break;
1119         case FBIOBLANK:
1120                 if (!lock_fb_info(info))
1121                         return -ENODEV;
1122                 console_lock();
1123                 info->flags |= FBINFO_MISC_USEREVENT;
1124                 ret = fb_blank(info, arg);
1125                 info->flags &= ~FBINFO_MISC_USEREVENT;
1126                 console_unlock();
1127                 unlock_fb_info(info);
1128                 break;
1129         default:
1130                 if (!lock_fb_info(info))
1131                         return -ENODEV;
1132                 fb = info->fbops;
1133                 if (fb->fb_ioctl)
1134                         ret = fb->fb_ioctl(info, cmd, arg);
1135                 else
1136                         ret = -ENOTTY;
1137                 unlock_fb_info(info);
1138         }
1139         return ret;
1140 }
1141
1142 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1143 {
1144         struct inode *inode = file->f_path.dentry->d_inode;
1145         int fbidx = iminor(inode);
1146         struct fb_info *info = registered_fb[fbidx];
1147
1148         return do_fb_ioctl(info, cmd, arg);
1149 }
1150
1151 #ifdef CONFIG_COMPAT
1152 struct fb_fix_screeninfo32 {
1153         char                    id[16];
1154         compat_caddr_t          smem_start;
1155         u32                     smem_len;
1156         u32                     type;
1157         u32                     type_aux;
1158         u32                     visual;
1159         u16                     xpanstep;
1160         u16                     ypanstep;
1161         u16                     ywrapstep;
1162         u32                     line_length;
1163         compat_caddr_t          mmio_start;
1164         u32                     mmio_len;
1165         u32                     accel;
1166         u16                     reserved[3];
1167 };
1168
1169 struct fb_cmap32 {
1170         u32                     start;
1171         u32                     len;
1172         compat_caddr_t  red;
1173         compat_caddr_t  green;
1174         compat_caddr_t  blue;
1175         compat_caddr_t  transp;
1176 };
1177
1178 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1179                           unsigned long arg)
1180 {
1181         struct fb_cmap_user __user *cmap;
1182         struct fb_cmap32 __user *cmap32;
1183         __u32 data;
1184         int err;
1185
1186         cmap = compat_alloc_user_space(sizeof(*cmap));
1187         cmap32 = compat_ptr(arg);
1188
1189         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1190                 return -EFAULT;
1191
1192         if (get_user(data, &cmap32->red) ||
1193             put_user(compat_ptr(data), &cmap->red) ||
1194             get_user(data, &cmap32->green) ||
1195             put_user(compat_ptr(data), &cmap->green) ||
1196             get_user(data, &cmap32->blue) ||
1197             put_user(compat_ptr(data), &cmap->blue) ||
1198             get_user(data, &cmap32->transp) ||
1199             put_user(compat_ptr(data), &cmap->transp))
1200                 return -EFAULT;
1201
1202         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1203
1204         if (!err) {
1205                 if (copy_in_user(&cmap32->start,
1206                                  &cmap->start,
1207                                  2 * sizeof(__u32)))
1208                         err = -EFAULT;
1209         }
1210         return err;
1211 }
1212
1213 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1214                                   struct fb_fix_screeninfo32 __user *fix32)
1215 {
1216         __u32 data;
1217         int err;
1218
1219         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1220
1221         data = (__u32) (unsigned long) fix->smem_start;
1222         err |= put_user(data, &fix32->smem_start);
1223
1224         err |= put_user(fix->smem_len, &fix32->smem_len);
1225         err |= put_user(fix->type, &fix32->type);
1226         err |= put_user(fix->type_aux, &fix32->type_aux);
1227         err |= put_user(fix->visual, &fix32->visual);
1228         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1229         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1230         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1231         err |= put_user(fix->line_length, &fix32->line_length);
1232
1233         data = (__u32) (unsigned long) fix->mmio_start;
1234         err |= put_user(data, &fix32->mmio_start);
1235
1236         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1237         err |= put_user(fix->accel, &fix32->accel);
1238         err |= copy_to_user(fix32->reserved, fix->reserved,
1239                             sizeof(fix->reserved));
1240
1241         return err;
1242 }
1243
1244 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1245                               unsigned long arg)
1246 {
1247         mm_segment_t old_fs;
1248         struct fb_fix_screeninfo fix;
1249         struct fb_fix_screeninfo32 __user *fix32;
1250         int err;
1251
1252         fix32 = compat_ptr(arg);
1253
1254         old_fs = get_fs();
1255         set_fs(KERNEL_DS);
1256         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1257         set_fs(old_fs);
1258
1259         if (!err)
1260                 err = do_fscreeninfo_to_user(&fix, fix32);
1261
1262         return err;
1263 }
1264
1265 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1266                             unsigned long arg)
1267 {
1268         struct inode *inode = file->f_path.dentry->d_inode;
1269         int fbidx = iminor(inode);
1270         struct fb_info *info = registered_fb[fbidx];
1271         struct fb_ops *fb = info->fbops;
1272         long ret = -ENOIOCTLCMD;
1273
1274         switch(cmd) {
1275         case FBIOGET_VSCREENINFO:
1276         case FBIOPUT_VSCREENINFO:
1277         case FBIOPAN_DISPLAY:
1278         case FBIOGET_CON2FBMAP:
1279         case FBIOPUT_CON2FBMAP:
1280                 arg = (unsigned long) compat_ptr(arg);
1281         case FBIOBLANK:
1282                 ret = do_fb_ioctl(info, cmd, arg);
1283                 break;
1284
1285         case FBIOGET_FSCREENINFO:
1286                 ret = fb_get_fscreeninfo(info, cmd, arg);
1287                 break;
1288
1289         case FBIOGETCMAP:
1290         case FBIOPUTCMAP:
1291                 ret = fb_getput_cmap(info, cmd, arg);
1292                 break;
1293
1294         default:
1295                 if (fb->fb_compat_ioctl)
1296                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1297                 break;
1298         }
1299         return ret;
1300 }
1301 #endif
1302
1303 static int
1304 fb_mmap(struct file *file, struct vm_area_struct * vma)
1305 {
1306         int fbidx = iminor(file->f_path.dentry->d_inode);
1307         struct fb_info *info = registered_fb[fbidx];
1308         struct fb_ops *fb = info->fbops;
1309         unsigned long off;
1310         unsigned long start;
1311         u32 len;
1312
1313         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1314                 return -EINVAL;
1315         off = vma->vm_pgoff << PAGE_SHIFT;
1316         if (!fb)
1317                 return -ENODEV;
1318         mutex_lock(&info->mm_lock);
1319         if (fb->fb_mmap) {
1320                 int res;
1321                 res = fb->fb_mmap(info, vma);
1322                 mutex_unlock(&info->mm_lock);
1323                 return res;
1324         }
1325
1326         /* frame buffer memory */
1327         start = info->fix.smem_start;
1328         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1329         if (off >= len) {
1330                 /* memory mapped io */
1331                 off -= len;
1332                 if (info->var.accel_flags) {
1333                         mutex_unlock(&info->mm_lock);
1334                         return -EINVAL;
1335                 }
1336                 start = info->fix.mmio_start;
1337                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1338         }
1339         mutex_unlock(&info->mm_lock);
1340         start &= PAGE_MASK;
1341         if ((vma->vm_end - vma->vm_start + off) > len)
1342                 return -EINVAL;
1343         off += start;
1344         vma->vm_pgoff = off >> PAGE_SHIFT;
1345         /* This is an IO map - tell maydump to skip this VMA */
1346         vma->vm_flags |= VM_IO | VM_RESERVED;
1347         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1348         fb_pgprotect(file, vma, off);
1349         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1350                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1351                 return -EAGAIN;
1352         return 0;
1353 }
1354
1355 static int
1356 fb_open(struct inode *inode, struct file *file)
1357 __acquires(&info->lock)
1358 __releases(&info->lock)
1359 {
1360         int fbidx = iminor(inode);
1361         struct fb_info *info;
1362         int res = 0;
1363
1364         if (fbidx >= FB_MAX)
1365                 return -ENODEV;
1366         info = registered_fb[fbidx];
1367         if (!info)
1368                 request_module("fb%d", fbidx);
1369         info = registered_fb[fbidx];
1370         if (!info)
1371                 return -ENODEV;
1372         mutex_lock(&info->lock);
1373         if (!try_module_get(info->fbops->owner)) {
1374                 res = -ENODEV;
1375                 goto out;
1376         }
1377         file->private_data = info;
1378         if (info->fbops->fb_open) {
1379                 res = info->fbops->fb_open(info,1);
1380                 if (res)
1381                         module_put(info->fbops->owner);
1382         }
1383 #ifdef CONFIG_FB_DEFERRED_IO
1384         if (info->fbdefio)
1385                 fb_deferred_io_open(info, inode, file);
1386 #endif
1387 out:
1388         mutex_unlock(&info->lock);
1389         return res;
1390 }
1391
1392 static int 
1393 fb_release(struct inode *inode, struct file *file)
1394 __acquires(&info->lock)
1395 __releases(&info->lock)
1396 {
1397         struct fb_info * const info = file->private_data;
1398
1399         mutex_lock(&info->lock);
1400         if (info->fbops->fb_release)
1401                 info->fbops->fb_release(info,1);
1402         module_put(info->fbops->owner);
1403         mutex_unlock(&info->lock);
1404         return 0;
1405 }
1406
1407 static const struct file_operations fb_fops = {
1408         .owner =        THIS_MODULE,
1409         .read =         fb_read,
1410         .write =        fb_write,
1411         .unlocked_ioctl = fb_ioctl,
1412 #ifdef CONFIG_COMPAT
1413         .compat_ioctl = fb_compat_ioctl,
1414 #endif
1415         .mmap =         fb_mmap,
1416         .open =         fb_open,
1417         .release =      fb_release,
1418 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1419         .get_unmapped_area = get_fb_unmapped_area,
1420 #endif
1421 #ifdef CONFIG_FB_DEFERRED_IO
1422         .fsync =        fb_deferred_io_fsync,
1423 #endif
1424         .llseek =       default_llseek,
1425 };
1426
1427 struct class *fb_class;
1428 EXPORT_SYMBOL(fb_class);
1429
1430 static int fb_check_foreignness(struct fb_info *fi)
1431 {
1432         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1433
1434         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1435
1436 #ifdef __BIG_ENDIAN
1437         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1438 #else
1439         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1440 #endif /* __BIG_ENDIAN */
1441
1442         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1443                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1444                        "support this framebuffer\n", fi->fix.id);
1445                 return -ENOSYS;
1446         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1447                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1448                        "support this framebuffer\n", fi->fix.id);
1449                 return -ENOSYS;
1450         }
1451
1452         return 0;
1453 }
1454
1455 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1456 {
1457         /* is the generic aperture base the same as the HW one */
1458         if (gen->base == hw->base)
1459                 return true;
1460         /* is the generic aperture base inside the hw base->hw base+size */
1461         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1462                 return true;
1463         return false;
1464 }
1465
1466 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1467                                     struct apertures_struct *hwa)
1468 {
1469         int i, j;
1470         if (!hwa || !gena)
1471                 return false;
1472
1473         for (i = 0; i < hwa->count; ++i) {
1474                 struct aperture *h = &hwa->ranges[i];
1475                 for (j = 0; j < gena->count; ++j) {
1476                         struct aperture *g = &gena->ranges[j];
1477                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1478                                 (unsigned long long)g->base,
1479                                 (unsigned long long)g->size,
1480                                 (unsigned long long)h->base,
1481                                 (unsigned long long)h->size);
1482                         if (apertures_overlap(g, h))
1483                                 return true;
1484                 }
1485         }
1486
1487         return false;
1488 }
1489
1490 #define VGA_FB_PHYS 0xA0000
1491 void remove_conflicting_framebuffers(struct apertures_struct *a,
1492                                      const char *name, bool primary)
1493 {
1494         int i;
1495
1496         /* check all firmware fbs and kick off if the base addr overlaps */
1497         for (i = 0 ; i < FB_MAX; i++) {
1498                 struct apertures_struct *gen_aper;
1499                 if (!registered_fb[i])
1500                         continue;
1501
1502                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1503                         continue;
1504
1505                 gen_aper = registered_fb[i]->apertures;
1506                 if (fb_do_apertures_overlap(gen_aper, a) ||
1507                         (primary && gen_aper && gen_aper->count &&
1508                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1509
1510                         printk(KERN_INFO "fb: conflicting fb hw usage "
1511                                "%s vs %s - removing generic driver\n",
1512                                name, registered_fb[i]->fix.id);
1513                         unregister_framebuffer(registered_fb[i]);
1514                 }
1515         }
1516 }
1517 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1518
1519 /**
1520  *      register_framebuffer - registers a frame buffer device
1521  *      @fb_info: frame buffer info structure
1522  *
1523  *      Registers a frame buffer device @fb_info.
1524  *
1525  *      Returns negative errno on error, or zero for success.
1526  *
1527  */
1528
1529 int
1530 register_framebuffer(struct fb_info *fb_info)
1531 {
1532         int i;
1533         struct fb_event event;
1534         struct fb_videomode mode;
1535
1536         if (num_registered_fb == FB_MAX)
1537                 return -ENXIO;
1538
1539         if (fb_check_foreignness(fb_info))
1540                 return -ENOSYS;
1541
1542         remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1543                                          fb_is_primary_device(fb_info));
1544
1545         num_registered_fb++;
1546         for (i = 0 ; i < FB_MAX; i++)
1547                 if (!registered_fb[i])
1548                         break;
1549         fb_info->node = i;
1550         mutex_init(&fb_info->lock);
1551         mutex_init(&fb_info->mm_lock);
1552
1553         fb_info->dev = device_create(fb_class, fb_info->device,
1554                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1555         if (IS_ERR(fb_info->dev)) {
1556                 /* Not fatal */
1557                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1558                 fb_info->dev = NULL;
1559         } else
1560                 fb_init_device(fb_info);
1561
1562         if (fb_info->pixmap.addr == NULL) {
1563                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1564                 if (fb_info->pixmap.addr) {
1565                         fb_info->pixmap.size = FBPIXMAPSIZE;
1566                         fb_info->pixmap.buf_align = 1;
1567                         fb_info->pixmap.scan_align = 1;
1568                         fb_info->pixmap.access_align = 32;
1569                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1570                 }
1571         }       
1572         fb_info->pixmap.offset = 0;
1573
1574         if (!fb_info->pixmap.blit_x)
1575                 fb_info->pixmap.blit_x = ~(u32)0;
1576
1577         if (!fb_info->pixmap.blit_y)
1578                 fb_info->pixmap.blit_y = ~(u32)0;
1579
1580         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1581                 INIT_LIST_HEAD(&fb_info->modelist);
1582
1583         fb_var_to_videomode(&mode, &fb_info->var);
1584         fb_add_videomode(&mode, &fb_info->modelist);
1585         registered_fb[i] = fb_info;
1586
1587         event.info = fb_info;
1588         if (!lock_fb_info(fb_info))
1589                 return -ENODEV;
1590         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1591         unlock_fb_info(fb_info);
1592         return 0;
1593 }
1594
1595
1596 /**
1597  *      unregister_framebuffer - releases a frame buffer device
1598  *      @fb_info: frame buffer info structure
1599  *
1600  *      Unregisters a frame buffer device @fb_info.
1601  *
1602  *      Returns negative errno on error, or zero for success.
1603  *
1604  *      This function will also notify the framebuffer console
1605  *      to release the driver.
1606  *
1607  *      This is meant to be called within a driver's module_exit()
1608  *      function. If this is called outside module_exit(), ensure
1609  *      that the driver implements fb_open() and fb_release() to
1610  *      check that no processes are using the device.
1611  */
1612
1613 int
1614 unregister_framebuffer(struct fb_info *fb_info)
1615 {
1616         struct fb_event event;
1617         int i, ret = 0;
1618
1619         i = fb_info->node;
1620         if (!registered_fb[i]) {
1621                 ret = -EINVAL;
1622                 goto done;
1623         }
1624
1625
1626         if (!lock_fb_info(fb_info))
1627                 return -ENODEV;
1628         event.info = fb_info;
1629         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1630         unlock_fb_info(fb_info);
1631
1632         if (ret) {
1633                 ret = -EINVAL;
1634                 goto done;
1635         }
1636
1637         if (fb_info->pixmap.addr &&
1638             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1639                 kfree(fb_info->pixmap.addr);
1640         fb_destroy_modelist(&fb_info->modelist);
1641         registered_fb[i]=NULL;
1642         num_registered_fb--;
1643         fb_cleanup_device(fb_info);
1644         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1645         event.info = fb_info;
1646         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1647
1648         /* this may free fb info */
1649         if (fb_info->fbops->fb_destroy)
1650                 fb_info->fbops->fb_destroy(fb_info);
1651 done:
1652         return ret;
1653 }
1654
1655 /**
1656  *      fb_set_suspend - low level driver signals suspend
1657  *      @info: framebuffer affected
1658  *      @state: 0 = resuming, !=0 = suspending
1659  *
1660  *      This is meant to be used by low level drivers to
1661  *      signal suspend/resume to the core & clients.
1662  *      It must be called with the console semaphore held
1663  */
1664 void fb_set_suspend(struct fb_info *info, int state)
1665 {
1666         struct fb_event event;
1667
1668         if (!lock_fb_info(info))
1669                 return;
1670         event.info = info;
1671         if (state) {
1672                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1673                 info->state = FBINFO_STATE_SUSPENDED;
1674         } else {
1675                 info->state = FBINFO_STATE_RUNNING;
1676                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1677         }
1678         unlock_fb_info(info);
1679 }
1680
1681 /**
1682  *      fbmem_init - init frame buffer subsystem
1683  *
1684  *      Initialize the frame buffer subsystem.
1685  *
1686  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1687  *
1688  */
1689
1690 static int __init
1691 fbmem_init(void)
1692 {
1693         proc_create("fb", 0, NULL, &fb_proc_fops);
1694
1695         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1696                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1697
1698         fb_class = class_create(THIS_MODULE, "graphics");
1699         if (IS_ERR(fb_class)) {
1700                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1701                 fb_class = NULL;
1702         }
1703         return 0;
1704 }
1705
1706 #ifdef MODULE
1707 module_init(fbmem_init);
1708 static void __exit
1709 fbmem_exit(void)
1710 {
1711         remove_proc_entry("fb", NULL);
1712         class_destroy(fb_class);
1713         unregister_chrdev(FB_MAJOR, "fb");
1714 }
1715
1716 module_exit(fbmem_exit);
1717 MODULE_LICENSE("GPL");
1718 MODULE_DESCRIPTION("Framebuffer base");
1719 #else
1720 subsys_initcall(fbmem_init);
1721 #endif
1722
1723 int fb_new_modelist(struct fb_info *info)
1724 {
1725         struct fb_event event;
1726         struct fb_var_screeninfo var = info->var;
1727         struct list_head *pos, *n;
1728         struct fb_modelist *modelist;
1729         struct fb_videomode *m, mode;
1730         int err = 1;
1731
1732         list_for_each_safe(pos, n, &info->modelist) {
1733                 modelist = list_entry(pos, struct fb_modelist, list);
1734                 m = &modelist->mode;
1735                 fb_videomode_to_var(&var, m);
1736                 var.activate = FB_ACTIVATE_TEST;
1737                 err = fb_set_var(info, &var);
1738                 fb_var_to_videomode(&mode, &var);
1739                 if (err || !fb_mode_is_equal(m, &mode)) {
1740                         list_del(pos);
1741                         kfree(pos);
1742                 }
1743         }
1744
1745         err = 1;
1746
1747         if (!list_empty(&info->modelist)) {
1748                 if (!lock_fb_info(info))
1749                         return -ENODEV;
1750                 event.info = info;
1751                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1752                 unlock_fb_info(info);
1753         }
1754
1755         return err;
1756 }
1757
1758 static char *video_options[FB_MAX] __read_mostly;
1759 static int ofonly __read_mostly;
1760
1761 /**
1762  * fb_get_options - get kernel boot parameters
1763  * @name:   framebuffer name as it would appear in
1764  *          the boot parameter line
1765  *          (video=<name>:<options>)
1766  * @option: the option will be stored here
1767  *
1768  * NOTE: Needed to maintain backwards compatibility
1769  */
1770 int fb_get_options(char *name, char **option)
1771 {
1772         char *opt, *options = NULL;
1773         int retval = 0;
1774         int name_len = strlen(name), i;
1775
1776         if (name_len && ofonly && strncmp(name, "offb", 4))
1777                 retval = 1;
1778
1779         if (name_len && !retval) {
1780                 for (i = 0; i < FB_MAX; i++) {
1781                         if (video_options[i] == NULL)
1782                                 continue;
1783                         if (!video_options[i][0])
1784                                 continue;
1785                         opt = video_options[i];
1786                         if (!strncmp(name, opt, name_len) &&
1787                             opt[name_len] == ':')
1788                                 options = opt + name_len + 1;
1789                 }
1790         }
1791         if (options && !strncmp(options, "off", 3))
1792                 retval = 1;
1793
1794         if (option)
1795                 *option = options;
1796
1797         return retval;
1798 }
1799
1800 #ifndef MODULE
1801 /**
1802  *      video_setup - process command line options
1803  *      @options: string of options
1804  *
1805  *      Process command line options for frame buffer subsystem.
1806  *
1807  *      NOTE: This function is a __setup and __init function.
1808  *            It only stores the options.  Drivers have to call
1809  *            fb_get_options() as necessary.
1810  *
1811  *      Returns zero.
1812  *
1813  */
1814 static int __init video_setup(char *options)
1815 {
1816         int i, global = 0;
1817
1818         if (!options || !*options)
1819                 global = 1;
1820
1821         if (!global && !strncmp(options, "ofonly", 6)) {
1822                 ofonly = 1;
1823                 global = 1;
1824         }
1825
1826         if (!global && !strchr(options, ':')) {
1827                 fb_mode_option = options;
1828                 global = 1;
1829         }
1830
1831         if (!global) {
1832                 for (i = 0; i < FB_MAX; i++) {
1833                         if (video_options[i] == NULL) {
1834                                 video_options[i] = options;
1835                                 break;
1836                         }
1837
1838                 }
1839         }
1840
1841         return 1;
1842 }
1843 __setup("video=", video_setup);
1844 #endif
1845
1846     /*
1847      *  Visible symbols for modules
1848      */
1849
1850 EXPORT_SYMBOL(register_framebuffer);
1851 EXPORT_SYMBOL(unregister_framebuffer);
1852 EXPORT_SYMBOL(num_registered_fb);
1853 EXPORT_SYMBOL(registered_fb);
1854 EXPORT_SYMBOL(fb_show_logo);
1855 EXPORT_SYMBOL(fb_set_var);
1856 EXPORT_SYMBOL(fb_blank);
1857 EXPORT_SYMBOL(fb_pan_display);
1858 EXPORT_SYMBOL(fb_get_buffer_offset);
1859 EXPORT_SYMBOL(fb_set_suspend);
1860 EXPORT_SYMBOL(fb_get_options);
1861
1862 MODULE_LICENSE("GPL");