Merge branch 'drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[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         u32 *buffer, *dst;
701         u32 __iomem *src;
702         int c, i, 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 = (u32 __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                 for (i = c >> 2; i--; )
742                         *dst++ = fb_readl(src++);
743                 if (c & 3) {
744                         u8 *dst8 = (u8 *) dst;
745                         u8 __iomem *src8 = (u8 __iomem *) src;
746
747                         for (i = c & 3; i--;)
748                                 *dst8++ = fb_readb(src8++);
749
750                         src = (u32 __iomem *) src8;
751                 }
752
753                 if (copy_to_user(buf, buffer, c)) {
754                         err = -EFAULT;
755                         break;
756                 }
757                 *ppos += c;
758                 buf += c;
759                 cnt += c;
760                 count -= c;
761         }
762
763         kfree(buffer);
764
765         return (err) ? err : cnt;
766 }
767
768 static ssize_t
769 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
770 {
771         unsigned long p = *ppos;
772         struct inode *inode = file->f_path.dentry->d_inode;
773         int fbidx = iminor(inode);
774         struct fb_info *info = registered_fb[fbidx];
775         u32 *buffer, *src;
776         u32 __iomem *dst;
777         int c, i, cnt = 0, err = 0;
778         unsigned long total_size;
779
780         if (!info || !info->screen_base)
781                 return -ENODEV;
782
783         if (info->state != FBINFO_STATE_RUNNING)
784                 return -EPERM;
785
786         if (info->fbops->fb_write)
787                 return info->fbops->fb_write(info, buf, count, ppos);
788         
789         total_size = info->screen_size;
790
791         if (total_size == 0)
792                 total_size = info->fix.smem_len;
793
794         if (p > total_size)
795                 return -EFBIG;
796
797         if (count > total_size) {
798                 err = -EFBIG;
799                 count = total_size;
800         }
801
802         if (count + p > total_size) {
803                 if (!err)
804                         err = -ENOSPC;
805
806                 count = total_size - p;
807         }
808
809         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
810                          GFP_KERNEL);
811         if (!buffer)
812                 return -ENOMEM;
813
814         dst = (u32 __iomem *) (info->screen_base + p);
815
816         if (info->fbops->fb_sync)
817                 info->fbops->fb_sync(info);
818
819         while (count) {
820                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
821                 src = buffer;
822
823                 if (copy_from_user(src, buf, c)) {
824                         err = -EFAULT;
825                         break;
826                 }
827
828                 for (i = c >> 2; i--; )
829                         fb_writel(*src++, dst++);
830
831                 if (c & 3) {
832                         u8 *src8 = (u8 *) src;
833                         u8 __iomem *dst8 = (u8 __iomem *) dst;
834
835                         for (i = c & 3; i--; )
836                                 fb_writeb(*src8++, dst8++);
837
838                         dst = (u32 __iomem *) dst8;
839                 }
840
841                 *ppos += c;
842                 buf += c;
843                 cnt += c;
844                 count -= c;
845         }
846
847         kfree(buffer);
848
849         return (cnt) ? cnt : err;
850 }
851
852 int
853 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
854 {
855         struct fb_fix_screeninfo *fix = &info->fix;
856         unsigned int yres = info->var.yres;
857         int err = 0;
858
859         if (var->yoffset > 0) {
860                 if (var->vmode & FB_VMODE_YWRAP) {
861                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
862                                 err = -EINVAL;
863                         else
864                                 yres = 0;
865                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
866                         err = -EINVAL;
867         }
868
869         if (var->xoffset > 0 && (!fix->xpanstep ||
870                                  (var->xoffset % fix->xpanstep)))
871                 err = -EINVAL;
872
873         if (err || !info->fbops->fb_pan_display ||
874             var->yoffset > info->var.yres_virtual - yres ||
875             var->xoffset > info->var.xres_virtual - info->var.xres)
876                 return -EINVAL;
877
878         if ((err = info->fbops->fb_pan_display(var, info)))
879                 return err;
880         info->var.xoffset = var->xoffset;
881         info->var.yoffset = var->yoffset;
882         if (var->vmode & FB_VMODE_YWRAP)
883                 info->var.vmode |= FB_VMODE_YWRAP;
884         else
885                 info->var.vmode &= ~FB_VMODE_YWRAP;
886         return 0;
887 }
888
889 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
890                          u32 activate)
891 {
892         struct fb_event event;
893         struct fb_blit_caps caps, fbcaps;
894         int err = 0;
895
896         memset(&caps, 0, sizeof(caps));
897         memset(&fbcaps, 0, sizeof(fbcaps));
898         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
899         event.info = info;
900         event.data = &caps;
901         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
902         info->fbops->fb_get_caps(info, &fbcaps, var);
903
904         if (((fbcaps.x ^ caps.x) & caps.x) ||
905             ((fbcaps.y ^ caps.y) & caps.y) ||
906             (fbcaps.len < caps.len))
907                 err = -EINVAL;
908
909         return err;
910 }
911
912 int
913 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
914 {
915         int flags = info->flags;
916         int ret = 0;
917
918         if (var->activate & FB_ACTIVATE_INV_MODE) {
919                 struct fb_videomode mode1, mode2;
920
921                 fb_var_to_videomode(&mode1, var);
922                 fb_var_to_videomode(&mode2, &info->var);
923                 /* make sure we don't delete the videomode of current var */
924                 ret = fb_mode_is_equal(&mode1, &mode2);
925
926                 if (!ret) {
927                     struct fb_event event;
928
929                     event.info = info;
930                     event.data = &mode1;
931                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
932                 }
933
934                 if (!ret)
935                     fb_delete_videomode(&mode1, &info->modelist);
936
937
938                 ret = (ret) ? -EINVAL : 0;
939                 goto done;
940         }
941
942         if ((var->activate & FB_ACTIVATE_FORCE) ||
943             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
944                 u32 activate = var->activate;
945
946                 if (!info->fbops->fb_check_var) {
947                         *var = info->var;
948                         goto done;
949                 }
950
951                 ret = info->fbops->fb_check_var(var, info);
952
953                 if (ret)
954                         goto done;
955
956                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
957                         struct fb_var_screeninfo old_var;
958                         struct fb_videomode mode;
959
960                         if (info->fbops->fb_get_caps) {
961                                 ret = fb_check_caps(info, var, activate);
962
963                                 if (ret)
964                                         goto done;
965                         }
966
967                         old_var = info->var;
968                         info->var = *var;
969
970                         if (info->fbops->fb_set_par) {
971                                 ret = info->fbops->fb_set_par(info);
972
973                                 if (ret) {
974                                         info->var = old_var;
975                                         printk(KERN_WARNING "detected "
976                                                 "fb_set_par error, "
977                                                 "error code: %d\n", ret);
978                                         goto done;
979                                 }
980                         }
981
982                         fb_pan_display(info, &info->var);
983                         fb_set_cmap(&info->cmap, info);
984                         fb_var_to_videomode(&mode, &info->var);
985
986                         if (info->modelist.prev && info->modelist.next &&
987                             !list_empty(&info->modelist))
988                                 ret = fb_add_videomode(&mode, &info->modelist);
989
990                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
991                                 struct fb_event event;
992                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
993                                         FB_EVENT_MODE_CHANGE_ALL :
994                                         FB_EVENT_MODE_CHANGE;
995
996                                 info->flags &= ~FBINFO_MISC_USEREVENT;
997                                 event.info = info;
998                                 event.data = &mode;
999                                 fb_notifier_call_chain(evnt, &event);
1000                         }
1001                 }
1002         }
1003
1004  done:
1005         return ret;
1006 }
1007
1008 int
1009 fb_blank(struct fb_info *info, int blank)
1010 {       
1011         int ret = -EINVAL;
1012
1013         if (blank > FB_BLANK_POWERDOWN)
1014                 blank = FB_BLANK_POWERDOWN;
1015
1016         if (info->fbops->fb_blank)
1017                 ret = info->fbops->fb_blank(blank, info);
1018
1019         if (!ret) {
1020                 struct fb_event event;
1021
1022                 event.info = info;
1023                 event.data = &blank;
1024                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1025         }
1026
1027         return ret;
1028 }
1029
1030 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1031                         unsigned long arg)
1032 {
1033         struct fb_ops *fb;
1034         struct fb_var_screeninfo var;
1035         struct fb_fix_screeninfo fix;
1036         struct fb_con2fbmap con2fb;
1037         struct fb_cmap cmap_from;
1038         struct fb_cmap_user cmap;
1039         struct fb_event event;
1040         void __user *argp = (void __user *)arg;
1041         long ret = 0;
1042
1043         switch (cmd) {
1044         case FBIOGET_VSCREENINFO:
1045                 if (!lock_fb_info(info))
1046                         return -ENODEV;
1047                 var = info->var;
1048                 unlock_fb_info(info);
1049
1050                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1051                 break;
1052         case FBIOPUT_VSCREENINFO:
1053                 if (copy_from_user(&var, argp, sizeof(var)))
1054                         return -EFAULT;
1055                 if (!lock_fb_info(info))
1056                         return -ENODEV;
1057                 acquire_console_sem();
1058                 info->flags |= FBINFO_MISC_USEREVENT;
1059                 ret = fb_set_var(info, &var);
1060                 info->flags &= ~FBINFO_MISC_USEREVENT;
1061                 release_console_sem();
1062                 unlock_fb_info(info);
1063                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1064                         ret = -EFAULT;
1065                 break;
1066         case FBIOGET_FSCREENINFO:
1067                 if (!lock_fb_info(info))
1068                         return -ENODEV;
1069                 fix = info->fix;
1070                 unlock_fb_info(info);
1071
1072                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1073                 break;
1074         case FBIOPUTCMAP:
1075                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1076                         return -EFAULT;
1077                 ret = fb_set_user_cmap(&cmap, info);
1078                 break;
1079         case FBIOGETCMAP:
1080                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1081                         return -EFAULT;
1082                 if (!lock_fb_info(info))
1083                         return -ENODEV;
1084                 cmap_from = info->cmap;
1085                 unlock_fb_info(info);
1086                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1087                 break;
1088         case FBIOPAN_DISPLAY:
1089                 if (copy_from_user(&var, argp, sizeof(var)))
1090                         return -EFAULT;
1091                 if (!lock_fb_info(info))
1092                         return -ENODEV;
1093                 acquire_console_sem();
1094                 ret = fb_pan_display(info, &var);
1095                 release_console_sem();
1096                 unlock_fb_info(info);
1097                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1098                         return -EFAULT;
1099                 break;
1100         case FBIO_CURSOR:
1101                 ret = -EINVAL;
1102                 break;
1103         case FBIOGET_CON2FBMAP:
1104                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1105                         return -EFAULT;
1106                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1107                         return -EINVAL;
1108                 con2fb.framebuffer = -1;
1109                 event.data = &con2fb;
1110                 if (!lock_fb_info(info))
1111                         return -ENODEV;
1112                 event.info = info;
1113                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1114                 unlock_fb_info(info);
1115                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1116                 break;
1117         case FBIOPUT_CON2FBMAP:
1118                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1119                         return -EFAULT;
1120                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1121                         return -EINVAL;
1122                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1123                         return -EINVAL;
1124                 if (!registered_fb[con2fb.framebuffer])
1125                         request_module("fb%d", con2fb.framebuffer);
1126                 if (!registered_fb[con2fb.framebuffer]) {
1127                         ret = -EINVAL;
1128                         break;
1129                 }
1130                 event.data = &con2fb;
1131                 if (!lock_fb_info(info))
1132                         return -ENODEV;
1133                 event.info = info;
1134                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1135                 unlock_fb_info(info);
1136                 break;
1137         case FBIOBLANK:
1138                 if (!lock_fb_info(info))
1139                         return -ENODEV;
1140                 acquire_console_sem();
1141                 info->flags |= FBINFO_MISC_USEREVENT;
1142                 ret = fb_blank(info, arg);
1143                 info->flags &= ~FBINFO_MISC_USEREVENT;
1144                 release_console_sem();
1145                 unlock_fb_info(info);
1146                 break;
1147         default:
1148                 if (!lock_fb_info(info))
1149                         return -ENODEV;
1150                 fb = info->fbops;
1151                 if (fb->fb_ioctl)
1152                         ret = fb->fb_ioctl(info, cmd, arg);
1153                 else
1154                         ret = -ENOTTY;
1155                 unlock_fb_info(info);
1156         }
1157         return ret;
1158 }
1159
1160 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1161 {
1162         struct inode *inode = file->f_path.dentry->d_inode;
1163         int fbidx = iminor(inode);
1164         struct fb_info *info = registered_fb[fbidx];
1165
1166         return do_fb_ioctl(info, cmd, arg);
1167 }
1168
1169 #ifdef CONFIG_COMPAT
1170 struct fb_fix_screeninfo32 {
1171         char                    id[16];
1172         compat_caddr_t          smem_start;
1173         u32                     smem_len;
1174         u32                     type;
1175         u32                     type_aux;
1176         u32                     visual;
1177         u16                     xpanstep;
1178         u16                     ypanstep;
1179         u16                     ywrapstep;
1180         u32                     line_length;
1181         compat_caddr_t          mmio_start;
1182         u32                     mmio_len;
1183         u32                     accel;
1184         u16                     reserved[3];
1185 };
1186
1187 struct fb_cmap32 {
1188         u32                     start;
1189         u32                     len;
1190         compat_caddr_t  red;
1191         compat_caddr_t  green;
1192         compat_caddr_t  blue;
1193         compat_caddr_t  transp;
1194 };
1195
1196 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1197                           unsigned long arg)
1198 {
1199         struct fb_cmap_user __user *cmap;
1200         struct fb_cmap32 __user *cmap32;
1201         __u32 data;
1202         int err;
1203
1204         cmap = compat_alloc_user_space(sizeof(*cmap));
1205         cmap32 = compat_ptr(arg);
1206
1207         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1208                 return -EFAULT;
1209
1210         if (get_user(data, &cmap32->red) ||
1211             put_user(compat_ptr(data), &cmap->red) ||
1212             get_user(data, &cmap32->green) ||
1213             put_user(compat_ptr(data), &cmap->green) ||
1214             get_user(data, &cmap32->blue) ||
1215             put_user(compat_ptr(data), &cmap->blue) ||
1216             get_user(data, &cmap32->transp) ||
1217             put_user(compat_ptr(data), &cmap->transp))
1218                 return -EFAULT;
1219
1220         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1221
1222         if (!err) {
1223                 if (copy_in_user(&cmap32->start,
1224                                  &cmap->start,
1225                                  2 * sizeof(__u32)))
1226                         err = -EFAULT;
1227         }
1228         return err;
1229 }
1230
1231 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1232                                   struct fb_fix_screeninfo32 __user *fix32)
1233 {
1234         __u32 data;
1235         int err;
1236
1237         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1238
1239         data = (__u32) (unsigned long) fix->smem_start;
1240         err |= put_user(data, &fix32->smem_start);
1241
1242         err |= put_user(fix->smem_len, &fix32->smem_len);
1243         err |= put_user(fix->type, &fix32->type);
1244         err |= put_user(fix->type_aux, &fix32->type_aux);
1245         err |= put_user(fix->visual, &fix32->visual);
1246         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1247         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1248         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1249         err |= put_user(fix->line_length, &fix32->line_length);
1250
1251         data = (__u32) (unsigned long) fix->mmio_start;
1252         err |= put_user(data, &fix32->mmio_start);
1253
1254         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1255         err |= put_user(fix->accel, &fix32->accel);
1256         err |= copy_to_user(fix32->reserved, fix->reserved,
1257                             sizeof(fix->reserved));
1258
1259         return err;
1260 }
1261
1262 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1263                               unsigned long arg)
1264 {
1265         mm_segment_t old_fs;
1266         struct fb_fix_screeninfo fix;
1267         struct fb_fix_screeninfo32 __user *fix32;
1268         int err;
1269
1270         fix32 = compat_ptr(arg);
1271
1272         old_fs = get_fs();
1273         set_fs(KERNEL_DS);
1274         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1275         set_fs(old_fs);
1276
1277         if (!err)
1278                 err = do_fscreeninfo_to_user(&fix, fix32);
1279
1280         return err;
1281 }
1282
1283 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1284                             unsigned long arg)
1285 {
1286         struct inode *inode = file->f_path.dentry->d_inode;
1287         int fbidx = iminor(inode);
1288         struct fb_info *info = registered_fb[fbidx];
1289         struct fb_ops *fb = info->fbops;
1290         long ret = -ENOIOCTLCMD;
1291
1292         switch(cmd) {
1293         case FBIOGET_VSCREENINFO:
1294         case FBIOPUT_VSCREENINFO:
1295         case FBIOPAN_DISPLAY:
1296         case FBIOGET_CON2FBMAP:
1297         case FBIOPUT_CON2FBMAP:
1298                 arg = (unsigned long) compat_ptr(arg);
1299         case FBIOBLANK:
1300                 ret = do_fb_ioctl(info, cmd, arg);
1301                 break;
1302
1303         case FBIOGET_FSCREENINFO:
1304                 ret = fb_get_fscreeninfo(info, cmd, arg);
1305                 break;
1306
1307         case FBIOGETCMAP:
1308         case FBIOPUTCMAP:
1309                 ret = fb_getput_cmap(info, cmd, arg);
1310                 break;
1311
1312         default:
1313                 if (fb->fb_compat_ioctl)
1314                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1315                 break;
1316         }
1317         return ret;
1318 }
1319 #endif
1320
1321 static int
1322 fb_mmap(struct file *file, struct vm_area_struct * vma)
1323 {
1324         int fbidx = iminor(file->f_path.dentry->d_inode);
1325         struct fb_info *info = registered_fb[fbidx];
1326         struct fb_ops *fb = info->fbops;
1327         unsigned long off;
1328         unsigned long start;
1329         u32 len;
1330
1331         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1332                 return -EINVAL;
1333         off = vma->vm_pgoff << PAGE_SHIFT;
1334         if (!fb)
1335                 return -ENODEV;
1336         mutex_lock(&info->mm_lock);
1337         if (fb->fb_mmap) {
1338                 int res;
1339                 res = fb->fb_mmap(info, vma);
1340                 mutex_unlock(&info->mm_lock);
1341                 return res;
1342         }
1343
1344         /* frame buffer memory */
1345         start = info->fix.smem_start;
1346         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1347         if (off >= len) {
1348                 /* memory mapped io */
1349                 off -= len;
1350                 if (info->var.accel_flags) {
1351                         mutex_unlock(&info->mm_lock);
1352                         return -EINVAL;
1353                 }
1354                 start = info->fix.mmio_start;
1355                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1356         }
1357         mutex_unlock(&info->mm_lock);
1358         start &= PAGE_MASK;
1359         if ((vma->vm_end - vma->vm_start + off) > len)
1360                 return -EINVAL;
1361         off += start;
1362         vma->vm_pgoff = off >> PAGE_SHIFT;
1363         /* This is an IO map - tell maydump to skip this VMA */
1364         vma->vm_flags |= VM_IO | VM_RESERVED;
1365         fb_pgprotect(file, vma, off);
1366         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1367                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1368                 return -EAGAIN;
1369         return 0;
1370 }
1371
1372 static int
1373 fb_open(struct inode *inode, struct file *file)
1374 __acquires(&info->lock)
1375 __releases(&info->lock)
1376 {
1377         int fbidx = iminor(inode);
1378         struct fb_info *info;
1379         int res = 0;
1380
1381         if (fbidx >= FB_MAX)
1382                 return -ENODEV;
1383         info = registered_fb[fbidx];
1384         if (!info)
1385                 request_module("fb%d", fbidx);
1386         info = registered_fb[fbidx];
1387         if (!info)
1388                 return -ENODEV;
1389         mutex_lock(&info->lock);
1390         if (!try_module_get(info->fbops->owner)) {
1391                 res = -ENODEV;
1392                 goto out;
1393         }
1394         file->private_data = info;
1395         if (info->fbops->fb_open) {
1396                 res = info->fbops->fb_open(info,1);
1397                 if (res)
1398                         module_put(info->fbops->owner);
1399         }
1400 #ifdef CONFIG_FB_DEFERRED_IO
1401         if (info->fbdefio)
1402                 fb_deferred_io_open(info, inode, file);
1403 #endif
1404 out:
1405         mutex_unlock(&info->lock);
1406         return res;
1407 }
1408
1409 static int 
1410 fb_release(struct inode *inode, struct file *file)
1411 __acquires(&info->lock)
1412 __releases(&info->lock)
1413 {
1414         struct fb_info * const info = file->private_data;
1415
1416         mutex_lock(&info->lock);
1417         if (info->fbops->fb_release)
1418                 info->fbops->fb_release(info,1);
1419         module_put(info->fbops->owner);
1420         mutex_unlock(&info->lock);
1421         return 0;
1422 }
1423
1424 static const struct file_operations fb_fops = {
1425         .owner =        THIS_MODULE,
1426         .read =         fb_read,
1427         .write =        fb_write,
1428         .unlocked_ioctl = fb_ioctl,
1429 #ifdef CONFIG_COMPAT
1430         .compat_ioctl = fb_compat_ioctl,
1431 #endif
1432         .mmap =         fb_mmap,
1433         .open =         fb_open,
1434         .release =      fb_release,
1435 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1436         .get_unmapped_area = get_fb_unmapped_area,
1437 #endif
1438 #ifdef CONFIG_FB_DEFERRED_IO
1439         .fsync =        fb_deferred_io_fsync,
1440 #endif
1441 };
1442
1443 struct class *fb_class;
1444 EXPORT_SYMBOL(fb_class);
1445
1446 static int fb_check_foreignness(struct fb_info *fi)
1447 {
1448         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1449
1450         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1451
1452 #ifdef __BIG_ENDIAN
1453         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1454 #else
1455         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1456 #endif /* __BIG_ENDIAN */
1457
1458         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1459                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1460                        "support this framebuffer\n", fi->fix.id);
1461                 return -ENOSYS;
1462         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1463                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1464                        "support this framebuffer\n", fi->fix.id);
1465                 return -ENOSYS;
1466         }
1467
1468         return 0;
1469 }
1470
1471 static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
1472 {
1473         /* is the generic aperture base the same as the HW one */
1474         if (gen->aperture_base == hw->aperture_base)
1475                 return true;
1476         /* is the generic aperture base inside the hw base->hw base+size */
1477         if (gen->aperture_base > hw->aperture_base && gen->aperture_base <= hw->aperture_base + hw->aperture_size)
1478                 return true;
1479         return false;
1480 }
1481 /**
1482  *      register_framebuffer - registers a frame buffer device
1483  *      @fb_info: frame buffer info structure
1484  *
1485  *      Registers a frame buffer device @fb_info.
1486  *
1487  *      Returns negative errno on error, or zero for success.
1488  *
1489  */
1490
1491 int
1492 register_framebuffer(struct fb_info *fb_info)
1493 {
1494         int i;
1495         struct fb_event event;
1496         struct fb_videomode mode;
1497
1498         if (num_registered_fb == FB_MAX)
1499                 return -ENXIO;
1500
1501         if (fb_check_foreignness(fb_info))
1502                 return -ENOSYS;
1503
1504         /* check all firmware fbs and kick off if the base addr overlaps */
1505         for (i = 0 ; i < FB_MAX; i++) {
1506                 if (!registered_fb[i])
1507                         continue;
1508
1509                 if (registered_fb[i]->flags & FBINFO_MISC_FIRMWARE) {
1510                         if (fb_do_apertures_overlap(registered_fb[i], fb_info)) {
1511                                 printk(KERN_ERR "fb: conflicting fb hw usage "
1512                                        "%s vs %s - removing generic driver\n",
1513                                        fb_info->fix.id,
1514                                        registered_fb[i]->fix.id);
1515                                 unregister_framebuffer(registered_fb[i]);
1516                                 break;
1517                         }
1518                 }
1519         }
1520
1521         num_registered_fb++;
1522         for (i = 0 ; i < FB_MAX; i++)
1523                 if (!registered_fb[i])
1524                         break;
1525         fb_info->node = i;
1526         mutex_init(&fb_info->lock);
1527         mutex_init(&fb_info->mm_lock);
1528
1529         fb_info->dev = device_create(fb_class, fb_info->device,
1530                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1531         if (IS_ERR(fb_info->dev)) {
1532                 /* Not fatal */
1533                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1534                 fb_info->dev = NULL;
1535         } else
1536                 fb_init_device(fb_info);
1537
1538         if (fb_info->pixmap.addr == NULL) {
1539                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1540                 if (fb_info->pixmap.addr) {
1541                         fb_info->pixmap.size = FBPIXMAPSIZE;
1542                         fb_info->pixmap.buf_align = 1;
1543                         fb_info->pixmap.scan_align = 1;
1544                         fb_info->pixmap.access_align = 32;
1545                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1546                 }
1547         }       
1548         fb_info->pixmap.offset = 0;
1549
1550         if (!fb_info->pixmap.blit_x)
1551                 fb_info->pixmap.blit_x = ~(u32)0;
1552
1553         if (!fb_info->pixmap.blit_y)
1554                 fb_info->pixmap.blit_y = ~(u32)0;
1555
1556         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1557                 INIT_LIST_HEAD(&fb_info->modelist);
1558
1559         fb_var_to_videomode(&mode, &fb_info->var);
1560         fb_add_videomode(&mode, &fb_info->modelist);
1561         registered_fb[i] = fb_info;
1562
1563         event.info = fb_info;
1564         if (!lock_fb_info(fb_info))
1565                 return -ENODEV;
1566         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1567         unlock_fb_info(fb_info);
1568         return 0;
1569 }
1570
1571
1572 /**
1573  *      unregister_framebuffer - releases a frame buffer device
1574  *      @fb_info: frame buffer info structure
1575  *
1576  *      Unregisters a frame buffer device @fb_info.
1577  *
1578  *      Returns negative errno on error, or zero for success.
1579  *
1580  *      This function will also notify the framebuffer console
1581  *      to release the driver.
1582  *
1583  *      This is meant to be called within a driver's module_exit()
1584  *      function. If this is called outside module_exit(), ensure
1585  *      that the driver implements fb_open() and fb_release() to
1586  *      check that no processes are using the device.
1587  */
1588
1589 int
1590 unregister_framebuffer(struct fb_info *fb_info)
1591 {
1592         struct fb_event event;
1593         int i, ret = 0;
1594
1595         i = fb_info->node;
1596         if (!registered_fb[i]) {
1597                 ret = -EINVAL;
1598                 goto done;
1599         }
1600
1601
1602         if (!lock_fb_info(fb_info))
1603                 return -ENODEV;
1604         event.info = fb_info;
1605         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1606         unlock_fb_info(fb_info);
1607
1608         if (ret) {
1609                 ret = -EINVAL;
1610                 goto done;
1611         }
1612
1613         if (fb_info->pixmap.addr &&
1614             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1615                 kfree(fb_info->pixmap.addr);
1616         fb_destroy_modelist(&fb_info->modelist);
1617         registered_fb[i]=NULL;
1618         num_registered_fb--;
1619         fb_cleanup_device(fb_info);
1620         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1621         event.info = fb_info;
1622         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1623
1624         /* this may free fb info */
1625         if (fb_info->fbops->fb_destroy)
1626                 fb_info->fbops->fb_destroy(fb_info);
1627 done:
1628         return ret;
1629 }
1630
1631 /**
1632  *      fb_set_suspend - low level driver signals suspend
1633  *      @info: framebuffer affected
1634  *      @state: 0 = resuming, !=0 = suspending
1635  *
1636  *      This is meant to be used by low level drivers to
1637  *      signal suspend/resume to the core & clients.
1638  *      It must be called with the console semaphore held
1639  */
1640 void fb_set_suspend(struct fb_info *info, int state)
1641 {
1642         struct fb_event event;
1643
1644         if (!lock_fb_info(info))
1645                 return;
1646         event.info = info;
1647         if (state) {
1648                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1649                 info->state = FBINFO_STATE_SUSPENDED;
1650         } else {
1651                 info->state = FBINFO_STATE_RUNNING;
1652                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1653         }
1654         unlock_fb_info(info);
1655 }
1656
1657 /**
1658  *      fbmem_init - init frame buffer subsystem
1659  *
1660  *      Initialize the frame buffer subsystem.
1661  *
1662  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1663  *
1664  */
1665
1666 static int __init
1667 fbmem_init(void)
1668 {
1669         proc_create("fb", 0, NULL, &fb_proc_fops);
1670
1671         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1672                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1673
1674         fb_class = class_create(THIS_MODULE, "graphics");
1675         if (IS_ERR(fb_class)) {
1676                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1677                 fb_class = NULL;
1678         }
1679         return 0;
1680 }
1681
1682 #ifdef MODULE
1683 module_init(fbmem_init);
1684 static void __exit
1685 fbmem_exit(void)
1686 {
1687         remove_proc_entry("fb", NULL);
1688         class_destroy(fb_class);
1689         unregister_chrdev(FB_MAJOR, "fb");
1690 }
1691
1692 module_exit(fbmem_exit);
1693 MODULE_LICENSE("GPL");
1694 MODULE_DESCRIPTION("Framebuffer base");
1695 #else
1696 subsys_initcall(fbmem_init);
1697 #endif
1698
1699 int fb_new_modelist(struct fb_info *info)
1700 {
1701         struct fb_event event;
1702         struct fb_var_screeninfo var = info->var;
1703         struct list_head *pos, *n;
1704         struct fb_modelist *modelist;
1705         struct fb_videomode *m, mode;
1706         int err = 1;
1707
1708         list_for_each_safe(pos, n, &info->modelist) {
1709                 modelist = list_entry(pos, struct fb_modelist, list);
1710                 m = &modelist->mode;
1711                 fb_videomode_to_var(&var, m);
1712                 var.activate = FB_ACTIVATE_TEST;
1713                 err = fb_set_var(info, &var);
1714                 fb_var_to_videomode(&mode, &var);
1715                 if (err || !fb_mode_is_equal(m, &mode)) {
1716                         list_del(pos);
1717                         kfree(pos);
1718                 }
1719         }
1720
1721         err = 1;
1722
1723         if (!list_empty(&info->modelist)) {
1724                 if (!lock_fb_info(info))
1725                         return -ENODEV;
1726                 event.info = info;
1727                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1728                 unlock_fb_info(info);
1729         }
1730
1731         return err;
1732 }
1733
1734 static char *video_options[FB_MAX] __read_mostly;
1735 static int ofonly __read_mostly;
1736
1737 /**
1738  * fb_get_options - get kernel boot parameters
1739  * @name:   framebuffer name as it would appear in
1740  *          the boot parameter line
1741  *          (video=<name>:<options>)
1742  * @option: the option will be stored here
1743  *
1744  * NOTE: Needed to maintain backwards compatibility
1745  */
1746 int fb_get_options(char *name, char **option)
1747 {
1748         char *opt, *options = NULL;
1749         int opt_len, retval = 0;
1750         int name_len = strlen(name), i;
1751
1752         if (name_len && ofonly && strncmp(name, "offb", 4))
1753                 retval = 1;
1754
1755         if (name_len && !retval) {
1756                 for (i = 0; i < FB_MAX; i++) {
1757                         if (video_options[i] == NULL)
1758                                 continue;
1759                         opt_len = strlen(video_options[i]);
1760                         if (!opt_len)
1761                                 continue;
1762                         opt = video_options[i];
1763                         if (!strncmp(name, opt, name_len) &&
1764                             opt[name_len] == ':')
1765                                 options = opt + name_len + 1;
1766                 }
1767         }
1768         if (options && !strncmp(options, "off", 3))
1769                 retval = 1;
1770
1771         if (option)
1772                 *option = options;
1773
1774         return retval;
1775 }
1776
1777 #ifndef MODULE
1778 /**
1779  *      video_setup - process command line options
1780  *      @options: string of options
1781  *
1782  *      Process command line options for frame buffer subsystem.
1783  *
1784  *      NOTE: This function is a __setup and __init function.
1785  *            It only stores the options.  Drivers have to call
1786  *            fb_get_options() as necessary.
1787  *
1788  *      Returns zero.
1789  *
1790  */
1791 static int __init video_setup(char *options)
1792 {
1793         int i, global = 0;
1794
1795         if (!options || !*options)
1796                 global = 1;
1797
1798         if (!global && !strncmp(options, "ofonly", 6)) {
1799                 ofonly = 1;
1800                 global = 1;
1801         }
1802
1803         if (!global && !strchr(options, ':')) {
1804                 fb_mode_option = options;
1805                 global = 1;
1806         }
1807
1808         if (!global) {
1809                 for (i = 0; i < FB_MAX; i++) {
1810                         if (video_options[i] == NULL) {
1811                                 video_options[i] = options;
1812                                 break;
1813                         }
1814
1815                 }
1816         }
1817
1818         return 1;
1819 }
1820 __setup("video=", video_setup);
1821 #endif
1822
1823     /*
1824      *  Visible symbols for modules
1825      */
1826
1827 EXPORT_SYMBOL(register_framebuffer);
1828 EXPORT_SYMBOL(unregister_framebuffer);
1829 EXPORT_SYMBOL(num_registered_fb);
1830 EXPORT_SYMBOL(registered_fb);
1831 EXPORT_SYMBOL(fb_show_logo);
1832 EXPORT_SYMBOL(fb_set_var);
1833 EXPORT_SYMBOL(fb_blank);
1834 EXPORT_SYMBOL(fb_pan_display);
1835 EXPORT_SYMBOL(fb_get_buffer_offset);
1836 EXPORT_SYMBOL(fb_set_suspend);
1837 EXPORT_SYMBOL(fb_get_options);
1838
1839 MODULE_LICENSE("GPL");