fbcon: Call con2fb_map functions directly
[sfrench/cifs-2.6.git] / drivers / video / fbdev / core / fbmem.c
1 /*
2  *  linux/drivers/video/fbmem.c
3  *
4  *  Copyright (C) 1994 Martin Schaller
5  *
6  *      2001 - Documented with DocBook
7  *      - Brad Douglas <brad@neruo.com>
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive
11  * for more details.
12  */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/major.h>
21 #include <linux/slab.h>
22 #include <linux/mm.h>
23 #include <linux/mman.h>
24 #include <linux/vt.h>
25 #include <linux/init.h>
26 #include <linux/linux_logo.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/console.h>
30 #include <linux/kmod.h>
31 #include <linux/err.h>
32 #include <linux/device.h>
33 #include <linux/efi.h>
34 #include <linux/fb.h>
35 #include <linux/fbcon.h>
36 #include <linux/mem_encrypt.h>
37 #include <linux/pci.h>
38
39 #include <asm/fb.h>
40
41
42     /*
43      *  Frame buffer device initialization and setup routines
44      */
45
46 #define FBPIXMAPSIZE    (1024 * 8)
47
48 static DEFINE_MUTEX(registration_lock);
49
50 struct fb_info *registered_fb[FB_MAX] __read_mostly;
51 EXPORT_SYMBOL(registered_fb);
52
53 int num_registered_fb __read_mostly;
54 EXPORT_SYMBOL(num_registered_fb);
55
56 bool fb_center_logo __read_mostly;
57 EXPORT_SYMBOL(fb_center_logo);
58
59 static struct fb_info *get_fb_info(unsigned int idx)
60 {
61         struct fb_info *fb_info;
62
63         if (idx >= FB_MAX)
64                 return ERR_PTR(-ENODEV);
65
66         mutex_lock(&registration_lock);
67         fb_info = registered_fb[idx];
68         if (fb_info)
69                 atomic_inc(&fb_info->count);
70         mutex_unlock(&registration_lock);
71
72         return fb_info;
73 }
74
75 static void put_fb_info(struct fb_info *fb_info)
76 {
77         if (!atomic_dec_and_test(&fb_info->count))
78                 return;
79         if (fb_info->fbops->fb_destroy)
80                 fb_info->fbops->fb_destroy(fb_info);
81 }
82
83 /*
84  * Helpers
85  */
86
87 int fb_get_color_depth(struct fb_var_screeninfo *var,
88                        struct fb_fix_screeninfo *fix)
89 {
90         int depth = 0;
91
92         if (fix->visual == FB_VISUAL_MONO01 ||
93             fix->visual == FB_VISUAL_MONO10)
94                 depth = 1;
95         else {
96                 if (var->green.length == var->blue.length &&
97                     var->green.length == var->red.length &&
98                     var->green.offset == var->blue.offset &&
99                     var->green.offset == var->red.offset)
100                         depth = var->green.length;
101                 else
102                         depth = var->green.length + var->red.length +
103                                 var->blue.length;
104         }
105
106         return depth;
107 }
108 EXPORT_SYMBOL(fb_get_color_depth);
109
110 /*
111  * Data padding functions.
112  */
113 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
114 {
115         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
116 }
117 EXPORT_SYMBOL(fb_pad_aligned_buffer);
118
119 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
120                                 u32 shift_high, u32 shift_low, u32 mod)
121 {
122         u8 mask = (u8) (0xfff << shift_high), tmp;
123         int i, j;
124
125         for (i = height; i--; ) {
126                 for (j = 0; j < idx; j++) {
127                         tmp = dst[j];
128                         tmp &= mask;
129                         tmp |= *src >> shift_low;
130                         dst[j] = tmp;
131                         tmp = *src << shift_high;
132                         dst[j+1] = tmp;
133                         src++;
134                 }
135                 tmp = dst[idx];
136                 tmp &= mask;
137                 tmp |= *src >> shift_low;
138                 dst[idx] = tmp;
139                 if (shift_high < mod) {
140                         tmp = *src << shift_high;
141                         dst[idx+1] = tmp;
142                 }
143                 src++;
144                 dst += d_pitch;
145         }
146 }
147 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
148
149 /*
150  * we need to lock this section since fb_cursor
151  * may use fb_imageblit()
152  */
153 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
154 {
155         u32 align = buf->buf_align - 1, offset;
156         char *addr = buf->addr;
157
158         /* If IO mapped, we need to sync before access, no sharing of
159          * the pixmap is done
160          */
161         if (buf->flags & FB_PIXMAP_IO) {
162                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
163                         info->fbops->fb_sync(info);
164                 return addr;
165         }
166
167         /* See if we fit in the remaining pixmap space */
168         offset = buf->offset + align;
169         offset &= ~align;
170         if (offset + size > buf->size) {
171                 /* We do not fit. In order to be able to re-use the buffer,
172                  * we must ensure no asynchronous DMA'ing or whatever operation
173                  * is in progress, we sync for that.
174                  */
175                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
176                         info->fbops->fb_sync(info);
177                 offset = 0;
178         }
179         buf->offset = offset + size;
180         addr += offset;
181
182         return addr;
183 }
184 EXPORT_SYMBOL(fb_get_buffer_offset);
185
186 #ifdef CONFIG_LOGO
187
188 static inline unsigned safe_shift(unsigned d, int n)
189 {
190         return n < 0 ? d >> -n : d << n;
191 }
192
193 static void fb_set_logocmap(struct fb_info *info,
194                                    const struct linux_logo *logo)
195 {
196         struct fb_cmap palette_cmap;
197         u16 palette_green[16];
198         u16 palette_blue[16];
199         u16 palette_red[16];
200         int i, j, n;
201         const unsigned char *clut = logo->clut;
202
203         palette_cmap.start = 0;
204         palette_cmap.len = 16;
205         palette_cmap.red = palette_red;
206         palette_cmap.green = palette_green;
207         palette_cmap.blue = palette_blue;
208         palette_cmap.transp = NULL;
209
210         for (i = 0; i < logo->clutsize; i += n) {
211                 n = logo->clutsize - i;
212                 /* palette_cmap provides space for only 16 colors at once */
213                 if (n > 16)
214                         n = 16;
215                 palette_cmap.start = 32 + i;
216                 palette_cmap.len = n;
217                 for (j = 0; j < n; ++j) {
218                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
219                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
220                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
221                         clut += 3;
222                 }
223                 fb_set_cmap(&palette_cmap, info);
224         }
225 }
226
227 static void  fb_set_logo_truepalette(struct fb_info *info,
228                                             const struct linux_logo *logo,
229                                             u32 *palette)
230 {
231         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
232         unsigned char redmask, greenmask, bluemask;
233         int redshift, greenshift, blueshift;
234         int i;
235         const unsigned char *clut = logo->clut;
236
237         /*
238          * We have to create a temporary palette since console palette is only
239          * 16 colors long.
240          */
241         /* Bug: Doesn't obey msb_right ... (who needs that?) */
242         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
243         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
244         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
245         redshift   = info->var.red.offset   - (8 - info->var.red.length);
246         greenshift = info->var.green.offset - (8 - info->var.green.length);
247         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
248
249         for ( i = 0; i < logo->clutsize; i++) {
250                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
251                                  safe_shift((clut[1] & greenmask), greenshift) |
252                                  safe_shift((clut[2] & bluemask), blueshift));
253                 clut += 3;
254         }
255 }
256
257 static void fb_set_logo_directpalette(struct fb_info *info,
258                                              const struct linux_logo *logo,
259                                              u32 *palette)
260 {
261         int redshift, greenshift, blueshift;
262         int i;
263
264         redshift = info->var.red.offset;
265         greenshift = info->var.green.offset;
266         blueshift = info->var.blue.offset;
267
268         for (i = 32; i < 32 + logo->clutsize; i++)
269                 palette[i] = i << redshift | i << greenshift | i << blueshift;
270 }
271
272 static void fb_set_logo(struct fb_info *info,
273                                const struct linux_logo *logo, u8 *dst,
274                                int depth)
275 {
276         int i, j, k;
277         const u8 *src = logo->data;
278         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
279         u8 fg = 1, d;
280
281         switch (fb_get_color_depth(&info->var, &info->fix)) {
282         case 1:
283                 fg = 1;
284                 break;
285         case 2:
286                 fg = 3;
287                 break;
288         default:
289                 fg = 7;
290                 break;
291         }
292
293         if (info->fix.visual == FB_VISUAL_MONO01 ||
294             info->fix.visual == FB_VISUAL_MONO10)
295                 fg = ~((u8) (0xfff << info->var.green.length));
296
297         switch (depth) {
298         case 4:
299                 for (i = 0; i < logo->height; i++)
300                         for (j = 0; j < logo->width; src++) {
301                                 *dst++ = *src >> 4;
302                                 j++;
303                                 if (j < logo->width) {
304                                         *dst++ = *src & 0x0f;
305                                         j++;
306                                 }
307                         }
308                 break;
309         case 1:
310                 for (i = 0; i < logo->height; i++) {
311                         for (j = 0; j < logo->width; src++) {
312                                 d = *src ^ xor;
313                                 for (k = 7; k >= 0 && j < logo->width; k--) {
314                                         *dst++ = ((d >> k) & 1) ? fg : 0;
315                                         j++;
316                                 }
317                         }
318                 }
319                 break;
320         }
321 }
322
323 /*
324  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
325  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
326  * the visual format and color depth of the framebuffer, the DAC, the
327  * pseudo_palette, and the logo data will be adjusted accordingly.
328  *
329  * Case 1 - linux_logo_clut224:
330  * Color exceeds the number of console colors (16), thus we set the hardware DAC
331  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
332  *
333  * For visuals that require color info from the pseudo_palette, we also construct
334  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
335  * will be set.
336  *
337  * Case 2 - linux_logo_vga16:
338  * The number of colors just matches the console colors, thus there is no need
339  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
340  * each byte contains color information for two pixels (upper and lower nibble).
341  * To be consistent with fb_imageblit() usage, we therefore separate the two
342  * nibbles into separate bytes. The "depth" flag will be set to 4.
343  *
344  * Case 3 - linux_logo_mono:
345  * This is similar with Case 2.  Each byte contains information for 8 pixels.
346  * We isolate each bit and expand each into a byte. The "depth" flag will
347  * be set to 1.
348  */
349 static struct logo_data {
350         int depth;
351         int needs_directpalette;
352         int needs_truepalette;
353         int needs_cmapreset;
354         const struct linux_logo *logo;
355 } fb_logo __read_mostly;
356
357 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
358 {
359         u32 size = width * height, i;
360
361         out += size - 1;
362
363         for (i = size; i--; )
364                 *out-- = *in++;
365 }
366
367 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
368 {
369         int i, j, h = height - 1;
370
371         for (i = 0; i < height; i++)
372                 for (j = 0; j < width; j++)
373                                 out[height * j + h - i] = *in++;
374 }
375
376 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
377 {
378         int i, j, w = width - 1;
379
380         for (i = 0; i < height; i++)
381                 for (j = 0; j < width; j++)
382                         out[height * (w - j) + i] = *in++;
383 }
384
385 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
386                            struct fb_image *image, int rotate)
387 {
388         u32 tmp;
389
390         if (rotate == FB_ROTATE_UD) {
391                 fb_rotate_logo_ud(image->data, dst, image->width,
392                                   image->height);
393                 image->dx = info->var.xres - image->width - image->dx;
394                 image->dy = info->var.yres - image->height - image->dy;
395         } else if (rotate == FB_ROTATE_CW) {
396                 fb_rotate_logo_cw(image->data, dst, image->width,
397                                   image->height);
398                 tmp = image->width;
399                 image->width = image->height;
400                 image->height = tmp;
401                 tmp = image->dy;
402                 image->dy = image->dx;
403                 image->dx = info->var.xres - image->width - tmp;
404         } else if (rotate == FB_ROTATE_CCW) {
405                 fb_rotate_logo_ccw(image->data, dst, image->width,
406                                    image->height);
407                 tmp = image->width;
408                 image->width = image->height;
409                 image->height = tmp;
410                 tmp = image->dx;
411                 image->dx = image->dy;
412                 image->dy = info->var.yres - image->height - tmp;
413         }
414
415         image->data = dst;
416 }
417
418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
419                             int rotate, unsigned int num)
420 {
421         unsigned int x;
422
423         if (image->width > info->var.xres || image->height > info->var.yres)
424                 return;
425
426         if (rotate == FB_ROTATE_UR) {
427                 for (x = 0;
428                      x < num && image->dx + image->width <= info->var.xres;
429                      x++) {
430                         info->fbops->fb_imageblit(info, image);
431                         image->dx += image->width + 8;
432                 }
433         } else if (rotate == FB_ROTATE_UD) {
434                 u32 dx = image->dx;
435
436                 for (x = 0; x < num && image->dx <= dx; x++) {
437                         info->fbops->fb_imageblit(info, image);
438                         image->dx -= image->width + 8;
439                 }
440         } else if (rotate == FB_ROTATE_CW) {
441                 for (x = 0;
442                      x < num && image->dy + image->height <= info->var.yres;
443                      x++) {
444                         info->fbops->fb_imageblit(info, image);
445                         image->dy += image->height + 8;
446                 }
447         } else if (rotate == FB_ROTATE_CCW) {
448                 u32 dy = image->dy;
449
450                 for (x = 0; x < num && image->dy <= dy; x++) {
451                         info->fbops->fb_imageblit(info, image);
452                         image->dy -= image->height + 8;
453                 }
454         }
455 }
456
457 static int fb_show_logo_line(struct fb_info *info, int rotate,
458                              const struct linux_logo *logo, int y,
459                              unsigned int n)
460 {
461         u32 *palette = NULL, *saved_pseudo_palette = NULL;
462         unsigned char *logo_new = NULL, *logo_rotate = NULL;
463         struct fb_image image;
464
465         /* Return if the frame buffer is not mapped or suspended */
466         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
467             info->fbops->owner)
468                 return 0;
469
470         image.depth = 8;
471         image.data = logo->data;
472
473         if (fb_logo.needs_cmapreset)
474                 fb_set_logocmap(info, logo);
475
476         if (fb_logo.needs_truepalette ||
477             fb_logo.needs_directpalette) {
478                 palette = kmalloc(256 * 4, GFP_KERNEL);
479                 if (palette == NULL)
480                         return 0;
481
482                 if (fb_logo.needs_truepalette)
483                         fb_set_logo_truepalette(info, logo, palette);
484                 else
485                         fb_set_logo_directpalette(info, logo, palette);
486
487                 saved_pseudo_palette = info->pseudo_palette;
488                 info->pseudo_palette = palette;
489         }
490
491         if (fb_logo.depth <= 4) {
492                 logo_new = kmalloc_array(logo->width, logo->height,
493                                          GFP_KERNEL);
494                 if (logo_new == NULL) {
495                         kfree(palette);
496                         if (saved_pseudo_palette)
497                                 info->pseudo_palette = saved_pseudo_palette;
498                         return 0;
499                 }
500                 image.data = logo_new;
501                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
502         }
503
504         if (fb_center_logo) {
505                 int xres = info->var.xres;
506                 int yres = info->var.yres;
507
508                 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
509                         xres = info->var.yres;
510                         yres = info->var.xres;
511                 }
512
513                 while (n && (n * (logo->width + 8) - 8 > xres))
514                         --n;
515                 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
516                 image.dy = y ?: (yres - logo->height) / 2;
517         } else {
518                 image.dx = 0;
519                 image.dy = y;
520         }
521
522         image.width = logo->width;
523         image.height = logo->height;
524
525         if (rotate) {
526                 logo_rotate = kmalloc_array(logo->width, logo->height,
527                                             GFP_KERNEL);
528                 if (logo_rotate)
529                         fb_rotate_logo(info, logo_rotate, &image, rotate);
530         }
531
532         fb_do_show_logo(info, &image, rotate, n);
533
534         kfree(palette);
535         if (saved_pseudo_palette != NULL)
536                 info->pseudo_palette = saved_pseudo_palette;
537         kfree(logo_new);
538         kfree(logo_rotate);
539         return image.dy + logo->height;
540 }
541
542
543 #ifdef CONFIG_FB_LOGO_EXTRA
544
545 #define FB_LOGO_EX_NUM_MAX 10
546 static struct logo_data_extra {
547         const struct linux_logo *logo;
548         unsigned int n;
549 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
550 static unsigned int fb_logo_ex_num;
551
552 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
553 {
554         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
555                 return;
556
557         fb_logo_ex[fb_logo_ex_num].logo = logo;
558         fb_logo_ex[fb_logo_ex_num].n = n;
559         fb_logo_ex_num++;
560 }
561
562 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
563                                   unsigned int yres)
564 {
565         unsigned int i;
566
567         /* FIXME: logo_ex supports only truecolor fb. */
568         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
569                 fb_logo_ex_num = 0;
570
571         for (i = 0; i < fb_logo_ex_num; i++) {
572                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
573                         fb_logo_ex[i].logo = NULL;
574                         continue;
575                 }
576                 height += fb_logo_ex[i].logo->height;
577                 if (height > yres) {
578                         height -= fb_logo_ex[i].logo->height;
579                         fb_logo_ex_num = i;
580                         break;
581                 }
582         }
583         return height;
584 }
585
586 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
587 {
588         unsigned int i;
589
590         for (i = 0; i < fb_logo_ex_num; i++)
591                 y = fb_show_logo_line(info, rotate,
592                                       fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
593
594         return y;
595 }
596
597 #else /* !CONFIG_FB_LOGO_EXTRA */
598
599 static inline int fb_prepare_extra_logos(struct fb_info *info,
600                                          unsigned int height,
601                                          unsigned int yres)
602 {
603         return height;
604 }
605
606 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
607 {
608         return y;
609 }
610
611 #endif /* CONFIG_FB_LOGO_EXTRA */
612
613
614 int fb_prepare_logo(struct fb_info *info, int rotate)
615 {
616         int depth = fb_get_color_depth(&info->var, &info->fix);
617         unsigned int yres;
618         int height;
619
620         memset(&fb_logo, 0, sizeof(struct logo_data));
621
622         if (info->flags & FBINFO_MISC_TILEBLITTING ||
623             info->fbops->owner)
624                 return 0;
625
626         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
627                 depth = info->var.blue.length;
628                 if (info->var.red.length < depth)
629                         depth = info->var.red.length;
630                 if (info->var.green.length < depth)
631                         depth = info->var.green.length;
632         }
633
634         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
635                 /* assume console colormap */
636                 depth = 4;
637         }
638
639         /* Return if no suitable logo was found */
640         fb_logo.logo = fb_find_logo(depth);
641
642         if (!fb_logo.logo) {
643                 return 0;
644         }
645
646         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
647                 yres = info->var.yres;
648         else
649                 yres = info->var.xres;
650
651         if (fb_logo.logo->height > yres) {
652                 fb_logo.logo = NULL;
653                 return 0;
654         }
655
656         /* What depth we asked for might be different from what we get */
657         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
658                 fb_logo.depth = 8;
659         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
660                 fb_logo.depth = 4;
661         else
662                 fb_logo.depth = 1;
663
664
665         if (fb_logo.depth > 4 && depth > 4) {
666                 switch (info->fix.visual) {
667                 case FB_VISUAL_TRUECOLOR:
668                         fb_logo.needs_truepalette = 1;
669                         break;
670                 case FB_VISUAL_DIRECTCOLOR:
671                         fb_logo.needs_directpalette = 1;
672                         fb_logo.needs_cmapreset = 1;
673                         break;
674                 case FB_VISUAL_PSEUDOCOLOR:
675                         fb_logo.needs_cmapreset = 1;
676                         break;
677                 }
678         }
679
680         height = fb_logo.logo->height;
681         if (fb_center_logo)
682                 height += (yres - fb_logo.logo->height) / 2;
683
684         return fb_prepare_extra_logos(info, height, yres);
685 }
686
687 int fb_show_logo(struct fb_info *info, int rotate)
688 {
689         int y;
690
691         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
692                               num_online_cpus());
693         y = fb_show_extra_logos(info, y, rotate);
694
695         return y;
696 }
697 #else
698 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
699 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
700 #endif /* CONFIG_LOGO */
701 EXPORT_SYMBOL(fb_prepare_logo);
702 EXPORT_SYMBOL(fb_show_logo);
703
704 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
705 {
706         mutex_lock(&registration_lock);
707         return (*pos < FB_MAX) ? pos : NULL;
708 }
709
710 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
711 {
712         (*pos)++;
713         return (*pos < FB_MAX) ? pos : NULL;
714 }
715
716 static void fb_seq_stop(struct seq_file *m, void *v)
717 {
718         mutex_unlock(&registration_lock);
719 }
720
721 static int fb_seq_show(struct seq_file *m, void *v)
722 {
723         int i = *(loff_t *)v;
724         struct fb_info *fi = registered_fb[i];
725
726         if (fi)
727                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
728         return 0;
729 }
730
731 static const struct seq_operations proc_fb_seq_ops = {
732         .start  = fb_seq_start,
733         .next   = fb_seq_next,
734         .stop   = fb_seq_stop,
735         .show   = fb_seq_show,
736 };
737
738 /*
739  * We hold a reference to the fb_info in file->private_data,
740  * but if the current registered fb has changed, we don't
741  * actually want to use it.
742  *
743  * So look up the fb_info using the inode minor number,
744  * and just verify it against the reference we have.
745  */
746 static struct fb_info *file_fb_info(struct file *file)
747 {
748         struct inode *inode = file_inode(file);
749         int fbidx = iminor(inode);
750         struct fb_info *info = registered_fb[fbidx];
751
752         if (info != file->private_data)
753                 info = NULL;
754         return info;
755 }
756
757 static ssize_t
758 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
759 {
760         unsigned long p = *ppos;
761         struct fb_info *info = file_fb_info(file);
762         u8 *buffer, *dst;
763         u8 __iomem *src;
764         int c, cnt = 0, err = 0;
765         unsigned long total_size;
766
767         if (!info || ! info->screen_base)
768                 return -ENODEV;
769
770         if (info->state != FBINFO_STATE_RUNNING)
771                 return -EPERM;
772
773         if (info->fbops->fb_read)
774                 return info->fbops->fb_read(info, buf, count, ppos);
775         
776         total_size = info->screen_size;
777
778         if (total_size == 0)
779                 total_size = info->fix.smem_len;
780
781         if (p >= total_size)
782                 return 0;
783
784         if (count >= total_size)
785                 count = total_size;
786
787         if (count + p > total_size)
788                 count = total_size - p;
789
790         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
791                          GFP_KERNEL);
792         if (!buffer)
793                 return -ENOMEM;
794
795         src = (u8 __iomem *) (info->screen_base + p);
796
797         if (info->fbops->fb_sync)
798                 info->fbops->fb_sync(info);
799
800         while (count) {
801                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
802                 dst = buffer;
803                 fb_memcpy_fromfb(dst, src, c);
804                 dst += c;
805                 src += c;
806
807                 if (copy_to_user(buf, buffer, c)) {
808                         err = -EFAULT;
809                         break;
810                 }
811                 *ppos += c;
812                 buf += c;
813                 cnt += c;
814                 count -= c;
815         }
816
817         kfree(buffer);
818
819         return (err) ? err : cnt;
820 }
821
822 static ssize_t
823 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
824 {
825         unsigned long p = *ppos;
826         struct fb_info *info = file_fb_info(file);
827         u8 *buffer, *src;
828         u8 __iomem *dst;
829         int c, cnt = 0, err = 0;
830         unsigned long total_size;
831
832         if (!info || !info->screen_base)
833                 return -ENODEV;
834
835         if (info->state != FBINFO_STATE_RUNNING)
836                 return -EPERM;
837
838         if (info->fbops->fb_write)
839                 return info->fbops->fb_write(info, buf, count, ppos);
840         
841         total_size = info->screen_size;
842
843         if (total_size == 0)
844                 total_size = info->fix.smem_len;
845
846         if (p > total_size)
847                 return -EFBIG;
848
849         if (count > total_size) {
850                 err = -EFBIG;
851                 count = total_size;
852         }
853
854         if (count + p > total_size) {
855                 if (!err)
856                         err = -ENOSPC;
857
858                 count = total_size - p;
859         }
860
861         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
862                          GFP_KERNEL);
863         if (!buffer)
864                 return -ENOMEM;
865
866         dst = (u8 __iomem *) (info->screen_base + p);
867
868         if (info->fbops->fb_sync)
869                 info->fbops->fb_sync(info);
870
871         while (count) {
872                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
873                 src = buffer;
874
875                 if (copy_from_user(src, buf, c)) {
876                         err = -EFAULT;
877                         break;
878                 }
879
880                 fb_memcpy_tofb(dst, src, c);
881                 dst += c;
882                 src += c;
883                 *ppos += c;
884                 buf += c;
885                 cnt += c;
886                 count -= c;
887         }
888
889         kfree(buffer);
890
891         return (cnt) ? cnt : err;
892 }
893
894 int
895 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
896 {
897         struct fb_fix_screeninfo *fix = &info->fix;
898         unsigned int yres = info->var.yres;
899         int err = 0;
900
901         if (var->yoffset > 0) {
902                 if (var->vmode & FB_VMODE_YWRAP) {
903                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
904                                 err = -EINVAL;
905                         else
906                                 yres = 0;
907                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
908                         err = -EINVAL;
909         }
910
911         if (var->xoffset > 0 && (!fix->xpanstep ||
912                                  (var->xoffset % fix->xpanstep)))
913                 err = -EINVAL;
914
915         if (err || !info->fbops->fb_pan_display ||
916             var->yoffset > info->var.yres_virtual - yres ||
917             var->xoffset > info->var.xres_virtual - info->var.xres)
918                 return -EINVAL;
919
920         if ((err = info->fbops->fb_pan_display(var, info)))
921                 return err;
922         info->var.xoffset = var->xoffset;
923         info->var.yoffset = var->yoffset;
924         if (var->vmode & FB_VMODE_YWRAP)
925                 info->var.vmode |= FB_VMODE_YWRAP;
926         else
927                 info->var.vmode &= ~FB_VMODE_YWRAP;
928         return 0;
929 }
930 EXPORT_SYMBOL(fb_pan_display);
931
932 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
933                          u32 activate)
934 {
935         struct fb_blit_caps caps, fbcaps;
936         int err = 0;
937
938         memset(&caps, 0, sizeof(caps));
939         memset(&fbcaps, 0, sizeof(fbcaps));
940         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
941         fbcon_get_requirement(info, &caps);
942         info->fbops->fb_get_caps(info, &fbcaps, var);
943
944         if (((fbcaps.x ^ caps.x) & caps.x) ||
945             ((fbcaps.y ^ caps.y) & caps.y) ||
946             (fbcaps.len < caps.len))
947                 err = -EINVAL;
948
949         return err;
950 }
951
952 int
953 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
954 {
955         int flags = info->flags;
956         int ret = 0;
957         u32 activate;
958         struct fb_var_screeninfo old_var;
959         struct fb_videomode mode;
960         struct fb_event event;
961
962         if (var->activate & FB_ACTIVATE_INV_MODE) {
963                 struct fb_videomode mode1, mode2;
964
965                 fb_var_to_videomode(&mode1, var);
966                 fb_var_to_videomode(&mode2, &info->var);
967                 /* make sure we don't delete the videomode of current var */
968                 ret = fb_mode_is_equal(&mode1, &mode2);
969
970                 if (!ret)
971                         fbcon_mode_deleted(info, &mode1);
972
973                 if (!ret)
974                         fb_delete_videomode(&mode1, &info->modelist);
975
976
977                 return ret ? -EINVAL : 0;
978         }
979
980         if (!(var->activate & FB_ACTIVATE_FORCE) &&
981             !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
982                 return 0;
983
984         activate = var->activate;
985
986         /* When using FOURCC mode, make sure the red, green, blue and
987          * transp fields are set to 0.
988          */
989         if ((info->fix.capabilities & FB_CAP_FOURCC) &&
990             var->grayscale > 1) {
991                 if (var->red.offset     || var->green.offset    ||
992                     var->blue.offset    || var->transp.offset   ||
993                     var->red.length     || var->green.length    ||
994                     var->blue.length    || var->transp.length   ||
995                     var->red.msb_right  || var->green.msb_right ||
996                     var->blue.msb_right || var->transp.msb_right)
997                         return -EINVAL;
998         }
999
1000         if (!info->fbops->fb_check_var) {
1001                 *var = info->var;
1002                 return 0;
1003         }
1004
1005         ret = info->fbops->fb_check_var(var, info);
1006
1007         if (ret)
1008                 return ret;
1009
1010         if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1011                 return 0;
1012
1013         if (info->fbops->fb_get_caps) {
1014                 ret = fb_check_caps(info, var, activate);
1015
1016                 if (ret)
1017                         return ret;
1018         }
1019
1020         old_var = info->var;
1021         info->var = *var;
1022
1023         if (info->fbops->fb_set_par) {
1024                 ret = info->fbops->fb_set_par(info);
1025
1026                 if (ret) {
1027                         info->var = old_var;
1028                         printk(KERN_WARNING "detected "
1029                                 "fb_set_par error, "
1030                                 "error code: %d\n", ret);
1031                         return ret;
1032                 }
1033         }
1034
1035         fb_pan_display(info, &info->var);
1036         fb_set_cmap(&info->cmap, info);
1037         fb_var_to_videomode(&mode, &info->var);
1038
1039         if (info->modelist.prev && info->modelist.next &&
1040             !list_empty(&info->modelist))
1041                 ret = fb_add_videomode(&mode, &info->modelist);
1042
1043         if (ret)
1044                 return ret;
1045
1046         event.info = info;
1047         event.data = &mode;
1048         fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1049
1050         if (flags & FBINFO_MISC_USEREVENT)
1051                 fbcon_update_vcs(info, activate & FB_ACTIVATE_ALL);
1052
1053         return 0;
1054 }
1055 EXPORT_SYMBOL(fb_set_var);
1056
1057 int
1058 fb_blank(struct fb_info *info, int blank)
1059 {       
1060         struct fb_event event;
1061         int ret = -EINVAL, early_ret;
1062
1063         if (blank > FB_BLANK_POWERDOWN)
1064                 blank = FB_BLANK_POWERDOWN;
1065
1066         event.info = info;
1067         event.data = &blank;
1068
1069         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1070
1071         if (info->fbops->fb_blank)
1072                 ret = info->fbops->fb_blank(blank, info);
1073
1074         if (!ret)
1075                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1076         else {
1077                 /*
1078                  * if fb_blank is failed then revert effects of
1079                  * the early blank event.
1080                  */
1081                 if (!early_ret)
1082                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1083         }
1084
1085         return ret;
1086 }
1087 EXPORT_SYMBOL(fb_blank);
1088
1089 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1090                         unsigned long arg)
1091 {
1092         struct fb_ops *fb;
1093         struct fb_var_screeninfo var;
1094         struct fb_fix_screeninfo fix;
1095         struct fb_cmap cmap_from;
1096         struct fb_cmap_user cmap;
1097         void __user *argp = (void __user *)arg;
1098         long ret = 0;
1099
1100         switch (cmd) {
1101         case FBIOGET_VSCREENINFO:
1102                 lock_fb_info(info);
1103                 var = info->var;
1104                 unlock_fb_info(info);
1105
1106                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1107                 break;
1108         case FBIOPUT_VSCREENINFO:
1109                 if (copy_from_user(&var, argp, sizeof(var)))
1110                         return -EFAULT;
1111                 console_lock();
1112                 lock_fb_info(info);
1113                 info->flags |= FBINFO_MISC_USEREVENT;
1114                 ret = fb_set_var(info, &var);
1115                 info->flags &= ~FBINFO_MISC_USEREVENT;
1116                 unlock_fb_info(info);
1117                 console_unlock();
1118                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1119                         ret = -EFAULT;
1120                 break;
1121         case FBIOGET_FSCREENINFO:
1122                 lock_fb_info(info);
1123                 fix = info->fix;
1124                 if (info->flags & FBINFO_HIDE_SMEM_START)
1125                         fix.smem_start = 0;
1126                 unlock_fb_info(info);
1127
1128                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1129                 break;
1130         case FBIOPUTCMAP:
1131                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1132                         return -EFAULT;
1133                 ret = fb_set_user_cmap(&cmap, info);
1134                 break;
1135         case FBIOGETCMAP:
1136                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1137                         return -EFAULT;
1138                 lock_fb_info(info);
1139                 cmap_from = info->cmap;
1140                 unlock_fb_info(info);
1141                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1142                 break;
1143         case FBIOPAN_DISPLAY:
1144                 if (copy_from_user(&var, argp, sizeof(var)))
1145                         return -EFAULT;
1146                 console_lock();
1147                 lock_fb_info(info);
1148                 ret = fb_pan_display(info, &var);
1149                 unlock_fb_info(info);
1150                 console_unlock();
1151                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1152                         return -EFAULT;
1153                 break;
1154         case FBIO_CURSOR:
1155                 ret = -EINVAL;
1156                 break;
1157         case FBIOGET_CON2FBMAP:
1158                 ret = fbcon_get_con2fb_map_ioctl(argp);
1159                 break;
1160         case FBIOPUT_CON2FBMAP:
1161                 ret = fbcon_set_con2fb_map_ioctl(argp);
1162                 break;
1163         case FBIOBLANK:
1164                 console_lock();
1165                 lock_fb_info(info);
1166                 ret = fb_blank(info, arg);
1167                 /* might again call into fb_blank */
1168                 fbcon_fb_blanked(info, arg);
1169                 unlock_fb_info(info);
1170                 console_unlock();
1171                 break;
1172         default:
1173                 lock_fb_info(info);
1174                 fb = info->fbops;
1175                 if (fb->fb_ioctl)
1176                         ret = fb->fb_ioctl(info, cmd, arg);
1177                 else
1178                         ret = -ENOTTY;
1179                 unlock_fb_info(info);
1180         }
1181         return ret;
1182 }
1183
1184 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1185 {
1186         struct fb_info *info = file_fb_info(file);
1187
1188         if (!info)
1189                 return -ENODEV;
1190         return do_fb_ioctl(info, cmd, arg);
1191 }
1192
1193 #ifdef CONFIG_COMPAT
1194 struct fb_fix_screeninfo32 {
1195         char                    id[16];
1196         compat_caddr_t          smem_start;
1197         u32                     smem_len;
1198         u32                     type;
1199         u32                     type_aux;
1200         u32                     visual;
1201         u16                     xpanstep;
1202         u16                     ypanstep;
1203         u16                     ywrapstep;
1204         u32                     line_length;
1205         compat_caddr_t          mmio_start;
1206         u32                     mmio_len;
1207         u32                     accel;
1208         u16                     reserved[3];
1209 };
1210
1211 struct fb_cmap32 {
1212         u32                     start;
1213         u32                     len;
1214         compat_caddr_t  red;
1215         compat_caddr_t  green;
1216         compat_caddr_t  blue;
1217         compat_caddr_t  transp;
1218 };
1219
1220 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1221                           unsigned long arg)
1222 {
1223         struct fb_cmap_user __user *cmap;
1224         struct fb_cmap32 __user *cmap32;
1225         __u32 data;
1226         int err;
1227
1228         cmap = compat_alloc_user_space(sizeof(*cmap));
1229         cmap32 = compat_ptr(arg);
1230
1231         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1232                 return -EFAULT;
1233
1234         if (get_user(data, &cmap32->red) ||
1235             put_user(compat_ptr(data), &cmap->red) ||
1236             get_user(data, &cmap32->green) ||
1237             put_user(compat_ptr(data), &cmap->green) ||
1238             get_user(data, &cmap32->blue) ||
1239             put_user(compat_ptr(data), &cmap->blue) ||
1240             get_user(data, &cmap32->transp) ||
1241             put_user(compat_ptr(data), &cmap->transp))
1242                 return -EFAULT;
1243
1244         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1245
1246         if (!err) {
1247                 if (copy_in_user(&cmap32->start,
1248                                  &cmap->start,
1249                                  2 * sizeof(__u32)))
1250                         err = -EFAULT;
1251         }
1252         return err;
1253 }
1254
1255 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1256                                   struct fb_fix_screeninfo32 __user *fix32)
1257 {
1258         __u32 data;
1259         int err;
1260
1261         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1262
1263         data = (__u32) (unsigned long) fix->smem_start;
1264         err |= put_user(data, &fix32->smem_start);
1265
1266         err |= put_user(fix->smem_len, &fix32->smem_len);
1267         err |= put_user(fix->type, &fix32->type);
1268         err |= put_user(fix->type_aux, &fix32->type_aux);
1269         err |= put_user(fix->visual, &fix32->visual);
1270         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1271         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1272         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1273         err |= put_user(fix->line_length, &fix32->line_length);
1274
1275         data = (__u32) (unsigned long) fix->mmio_start;
1276         err |= put_user(data, &fix32->mmio_start);
1277
1278         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1279         err |= put_user(fix->accel, &fix32->accel);
1280         err |= copy_to_user(fix32->reserved, fix->reserved,
1281                             sizeof(fix->reserved));
1282
1283         if (err)
1284                 return -EFAULT;
1285         return 0;
1286 }
1287
1288 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1289                               unsigned long arg)
1290 {
1291         struct fb_fix_screeninfo fix;
1292
1293         lock_fb_info(info);
1294         fix = info->fix;
1295         if (info->flags & FBINFO_HIDE_SMEM_START)
1296                 fix.smem_start = 0;
1297         unlock_fb_info(info);
1298         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1299 }
1300
1301 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1302                             unsigned long arg)
1303 {
1304         struct fb_info *info = file_fb_info(file);
1305         struct fb_ops *fb;
1306         long ret = -ENOIOCTLCMD;
1307
1308         if (!info)
1309                 return -ENODEV;
1310         fb = info->fbops;
1311         switch(cmd) {
1312         case FBIOGET_VSCREENINFO:
1313         case FBIOPUT_VSCREENINFO:
1314         case FBIOPAN_DISPLAY:
1315         case FBIOGET_CON2FBMAP:
1316         case FBIOPUT_CON2FBMAP:
1317                 arg = (unsigned long) compat_ptr(arg);
1318                 /* fall through */
1319         case FBIOBLANK:
1320                 ret = do_fb_ioctl(info, cmd, arg);
1321                 break;
1322
1323         case FBIOGET_FSCREENINFO:
1324                 ret = fb_get_fscreeninfo(info, cmd, arg);
1325                 break;
1326
1327         case FBIOGETCMAP:
1328         case FBIOPUTCMAP:
1329                 ret = fb_getput_cmap(info, cmd, arg);
1330                 break;
1331
1332         default:
1333                 if (fb->fb_compat_ioctl)
1334                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1335                 break;
1336         }
1337         return ret;
1338 }
1339 #endif
1340
1341 static int
1342 fb_mmap(struct file *file, struct vm_area_struct * vma)
1343 {
1344         struct fb_info *info = file_fb_info(file);
1345         struct fb_ops *fb;
1346         unsigned long mmio_pgoff;
1347         unsigned long start;
1348         u32 len;
1349
1350         if (!info)
1351                 return -ENODEV;
1352         fb = info->fbops;
1353         mutex_lock(&info->mm_lock);
1354         if (fb->fb_mmap) {
1355                 int res;
1356
1357                 /*
1358                  * The framebuffer needs to be accessed decrypted, be sure
1359                  * SME protection is removed ahead of the call
1360                  */
1361                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1362                 res = fb->fb_mmap(info, vma);
1363                 mutex_unlock(&info->mm_lock);
1364                 return res;
1365         }
1366
1367         /*
1368          * Ugh. This can be either the frame buffer mapping, or
1369          * if pgoff points past it, the mmio mapping.
1370          */
1371         start = info->fix.smem_start;
1372         len = info->fix.smem_len;
1373         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1374         if (vma->vm_pgoff >= mmio_pgoff) {
1375                 if (info->var.accel_flags) {
1376                         mutex_unlock(&info->mm_lock);
1377                         return -EINVAL;
1378                 }
1379
1380                 vma->vm_pgoff -= mmio_pgoff;
1381                 start = info->fix.mmio_start;
1382                 len = info->fix.mmio_len;
1383         }
1384         mutex_unlock(&info->mm_lock);
1385
1386         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1387         /*
1388          * The framebuffer needs to be accessed decrypted, be sure
1389          * SME protection is removed
1390          */
1391         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1392         fb_pgprotect(file, vma, start);
1393
1394         return vm_iomap_memory(vma, start, len);
1395 }
1396
1397 static int
1398 fb_open(struct inode *inode, struct file *file)
1399 __acquires(&info->lock)
1400 __releases(&info->lock)
1401 {
1402         int fbidx = iminor(inode);
1403         struct fb_info *info;
1404         int res = 0;
1405
1406         info = get_fb_info(fbidx);
1407         if (!info) {
1408                 request_module("fb%d", fbidx);
1409                 info = get_fb_info(fbidx);
1410                 if (!info)
1411                         return -ENODEV;
1412         }
1413         if (IS_ERR(info))
1414                 return PTR_ERR(info);
1415
1416         lock_fb_info(info);
1417         if (!try_module_get(info->fbops->owner)) {
1418                 res = -ENODEV;
1419                 goto out;
1420         }
1421         file->private_data = info;
1422         if (info->fbops->fb_open) {
1423                 res = info->fbops->fb_open(info,1);
1424                 if (res)
1425                         module_put(info->fbops->owner);
1426         }
1427 #ifdef CONFIG_FB_DEFERRED_IO
1428         if (info->fbdefio)
1429                 fb_deferred_io_open(info, inode, file);
1430 #endif
1431 out:
1432         unlock_fb_info(info);
1433         if (res)
1434                 put_fb_info(info);
1435         return res;
1436 }
1437
1438 static int 
1439 fb_release(struct inode *inode, struct file *file)
1440 __acquires(&info->lock)
1441 __releases(&info->lock)
1442 {
1443         struct fb_info * const info = file->private_data;
1444
1445         lock_fb_info(info);
1446         if (info->fbops->fb_release)
1447                 info->fbops->fb_release(info,1);
1448         module_put(info->fbops->owner);
1449         unlock_fb_info(info);
1450         put_fb_info(info);
1451         return 0;
1452 }
1453
1454 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1455 unsigned long get_fb_unmapped_area(struct file *filp,
1456                                    unsigned long addr, unsigned long len,
1457                                    unsigned long pgoff, unsigned long flags)
1458 {
1459         struct fb_info * const info = filp->private_data;
1460         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1461
1462         if (pgoff > fb_size || len > fb_size - pgoff)
1463                 return -EINVAL;
1464
1465         return (unsigned long)info->screen_base + pgoff;
1466 }
1467 #endif
1468
1469 static const struct file_operations fb_fops = {
1470         .owner =        THIS_MODULE,
1471         .read =         fb_read,
1472         .write =        fb_write,
1473         .unlocked_ioctl = fb_ioctl,
1474 #ifdef CONFIG_COMPAT
1475         .compat_ioctl = fb_compat_ioctl,
1476 #endif
1477         .mmap =         fb_mmap,
1478         .open =         fb_open,
1479         .release =      fb_release,
1480 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1481         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1482          !defined(CONFIG_MMU))
1483         .get_unmapped_area = get_fb_unmapped_area,
1484 #endif
1485 #ifdef CONFIG_FB_DEFERRED_IO
1486         .fsync =        fb_deferred_io_fsync,
1487 #endif
1488         .llseek =       default_llseek,
1489 };
1490
1491 struct class *fb_class;
1492 EXPORT_SYMBOL(fb_class);
1493
1494 static int fb_check_foreignness(struct fb_info *fi)
1495 {
1496         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1497
1498         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1499
1500 #ifdef __BIG_ENDIAN
1501         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1502 #else
1503         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1504 #endif /* __BIG_ENDIAN */
1505
1506         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1507                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1508                        "support this framebuffer\n", fi->fix.id);
1509                 return -ENOSYS;
1510         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1511                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1512                        "support this framebuffer\n", fi->fix.id);
1513                 return -ENOSYS;
1514         }
1515
1516         return 0;
1517 }
1518
1519 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1520 {
1521         /* is the generic aperture base the same as the HW one */
1522         if (gen->base == hw->base)
1523                 return true;
1524         /* is the generic aperture base inside the hw base->hw base+size */
1525         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1526                 return true;
1527         return false;
1528 }
1529
1530 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1531                                     struct apertures_struct *hwa)
1532 {
1533         int i, j;
1534         if (!hwa || !gena)
1535                 return false;
1536
1537         for (i = 0; i < hwa->count; ++i) {
1538                 struct aperture *h = &hwa->ranges[i];
1539                 for (j = 0; j < gena->count; ++j) {
1540                         struct aperture *g = &gena->ranges[j];
1541                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1542                                 (unsigned long long)g->base,
1543                                 (unsigned long long)g->size,
1544                                 (unsigned long long)h->base,
1545                                 (unsigned long long)h->size);
1546                         if (apertures_overlap(g, h))
1547                                 return true;
1548                 }
1549         }
1550
1551         return false;
1552 }
1553
1554 static void do_unregister_framebuffer(struct fb_info *fb_info);
1555
1556 #define VGA_FB_PHYS 0xA0000
1557 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1558                                                const char *name, bool primary)
1559 {
1560         int i;
1561
1562         /* check all firmware fbs and kick off if the base addr overlaps */
1563         for_each_registered_fb(i) {
1564                 struct apertures_struct *gen_aper;
1565
1566                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1567                         continue;
1568
1569                 gen_aper = registered_fb[i]->apertures;
1570                 if (fb_do_apertures_overlap(gen_aper, a) ||
1571                         (primary && gen_aper && gen_aper->count &&
1572                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1573
1574                         printk(KERN_INFO "fb%d: switching to %s from %s\n",
1575                                i, name, registered_fb[i]->fix.id);
1576                         do_unregister_framebuffer(registered_fb[i]);
1577                 }
1578         }
1579 }
1580
1581 static bool lockless_register_fb;
1582 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1583 MODULE_PARM_DESC(lockless_register_fb,
1584         "Lockless framebuffer registration for debugging [default=off]");
1585
1586 static int do_register_framebuffer(struct fb_info *fb_info)
1587 {
1588         int i, ret;
1589         struct fb_videomode mode;
1590
1591         if (fb_check_foreignness(fb_info))
1592                 return -ENOSYS;
1593
1594         do_remove_conflicting_framebuffers(fb_info->apertures,
1595                                            fb_info->fix.id,
1596                                            fb_is_primary_device(fb_info));
1597
1598         if (num_registered_fb == FB_MAX)
1599                 return -ENXIO;
1600
1601         num_registered_fb++;
1602         for (i = 0 ; i < FB_MAX; i++)
1603                 if (!registered_fb[i])
1604                         break;
1605         fb_info->node = i;
1606         atomic_set(&fb_info->count, 1);
1607         mutex_init(&fb_info->lock);
1608         mutex_init(&fb_info->mm_lock);
1609
1610         fb_info->dev = device_create(fb_class, fb_info->device,
1611                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1612         if (IS_ERR(fb_info->dev)) {
1613                 /* Not fatal */
1614                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1615                 fb_info->dev = NULL;
1616         } else
1617                 fb_init_device(fb_info);
1618
1619         if (fb_info->pixmap.addr == NULL) {
1620                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1621                 if (fb_info->pixmap.addr) {
1622                         fb_info->pixmap.size = FBPIXMAPSIZE;
1623                         fb_info->pixmap.buf_align = 1;
1624                         fb_info->pixmap.scan_align = 1;
1625                         fb_info->pixmap.access_align = 32;
1626                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1627                 }
1628         }       
1629         fb_info->pixmap.offset = 0;
1630
1631         if (!fb_info->pixmap.blit_x)
1632                 fb_info->pixmap.blit_x = ~(u32)0;
1633
1634         if (!fb_info->pixmap.blit_y)
1635                 fb_info->pixmap.blit_y = ~(u32)0;
1636
1637         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1638                 INIT_LIST_HEAD(&fb_info->modelist);
1639
1640         if (fb_info->skip_vt_switch)
1641                 pm_vt_switch_required(fb_info->dev, false);
1642         else
1643                 pm_vt_switch_required(fb_info->dev, true);
1644
1645         fb_var_to_videomode(&mode, &fb_info->var);
1646         fb_add_videomode(&mode, &fb_info->modelist);
1647         registered_fb[i] = fb_info;
1648
1649 #ifdef CONFIG_GUMSTIX_AM200EPD
1650         {
1651                 struct fb_event event;
1652                 event.info = fb_info;
1653                 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1654         }
1655 #endif
1656
1657         if (!lockless_register_fb)
1658                 console_lock();
1659         else
1660                 atomic_inc(&ignore_console_lock_warning);
1661         lock_fb_info(fb_info);
1662         ret = fbcon_fb_registered(fb_info);
1663         unlock_fb_info(fb_info);
1664
1665         if (!lockless_register_fb)
1666                 console_unlock();
1667         else
1668                 atomic_dec(&ignore_console_lock_warning);
1669         return ret;
1670 }
1671
1672 static void unbind_console(struct fb_info *fb_info)
1673 {
1674         int i = fb_info->node;
1675
1676         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1677                 return;
1678
1679         console_lock();
1680         lock_fb_info(fb_info);
1681         fbcon_fb_unbind(fb_info);
1682         unlock_fb_info(fb_info);
1683         console_unlock();
1684 }
1685
1686 void unlink_framebuffer(struct fb_info *fb_info)
1687 {
1688         int i;
1689
1690         i = fb_info->node;
1691         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1692                 return;
1693
1694         if (!fb_info->dev)
1695                 return;
1696
1697         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1698
1699         pm_vt_switch_unregister(fb_info->dev);
1700
1701         unbind_console(fb_info);
1702
1703         fb_info->dev = NULL;
1704 }
1705 EXPORT_SYMBOL(unlink_framebuffer);
1706
1707 static void do_unregister_framebuffer(struct fb_info *fb_info)
1708 {
1709         unlink_framebuffer(fb_info);
1710         if (fb_info->pixmap.addr &&
1711             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1712                 kfree(fb_info->pixmap.addr);
1713         fb_destroy_modelist(&fb_info->modelist);
1714         registered_fb[fb_info->node] = NULL;
1715         num_registered_fb--;
1716         fb_cleanup_device(fb_info);
1717 #ifdef CONFIG_GUMSTIX_AM200EPD
1718         {
1719                 struct fb_event event;
1720                 event.info = fb_info;
1721                 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1722         }
1723 #endif
1724         console_lock();
1725         fbcon_fb_unregistered(fb_info);
1726         console_unlock();
1727
1728         /* this may free fb info */
1729         put_fb_info(fb_info);
1730 }
1731
1732 /**
1733  * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1734  * @a: memory range, users of which are to be removed
1735  * @name: requesting driver name
1736  * @primary: also kick vga16fb if present
1737  *
1738  * This function removes framebuffer devices (initialized by firmware/bootloader)
1739  * which use memory range described by @a. If @a is NULL all such devices are
1740  * removed.
1741  */
1742 int remove_conflicting_framebuffers(struct apertures_struct *a,
1743                                     const char *name, bool primary)
1744 {
1745         bool do_free = false;
1746
1747         if (!a) {
1748                 a = alloc_apertures(1);
1749                 if (!a)
1750                         return -ENOMEM;
1751
1752                 a->ranges[0].base = 0;
1753                 a->ranges[0].size = ~0;
1754                 do_free = true;
1755         }
1756
1757         mutex_lock(&registration_lock);
1758         do_remove_conflicting_framebuffers(a, name, primary);
1759         mutex_unlock(&registration_lock);
1760
1761         if (do_free)
1762                 kfree(a);
1763
1764         return 0;
1765 }
1766 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1767
1768 /**
1769  * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1770  * @pdev: PCI device
1771  * @res_id: index of PCI BAR configuring framebuffer memory
1772  * @name: requesting driver name
1773  *
1774  * This function removes framebuffer devices (eg. initialized by firmware)
1775  * using memory range configured for @pdev's BAR @res_id.
1776  *
1777  * The function assumes that PCI device with shadowed ROM drives a primary
1778  * display and so kicks out vga16fb.
1779  */
1780 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
1781 {
1782         struct apertures_struct *ap;
1783         bool primary = false;
1784         int err, idx, bar;
1785         bool res_id_found = false;
1786
1787         for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1788                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1789                         continue;
1790                 idx++;
1791         }
1792
1793         ap = alloc_apertures(idx);
1794         if (!ap)
1795                 return -ENOMEM;
1796
1797         for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1798                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1799                         continue;
1800                 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1801                 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1802                 pci_info(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1803                          (unsigned long)pci_resource_start(pdev, bar),
1804                          (unsigned long)pci_resource_end(pdev, bar));
1805                 idx++;
1806                 if (res_id == bar)
1807                         res_id_found = true;
1808         }
1809         if (!res_id_found)
1810                 pci_warn(pdev, "%s: passed res_id (%d) is not a memory bar\n",
1811                          __func__, res_id);
1812
1813 #ifdef CONFIG_X86
1814         primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1815                                         IORESOURCE_ROM_SHADOW;
1816 #endif
1817         err = remove_conflicting_framebuffers(ap, name, primary);
1818         kfree(ap);
1819         return err;
1820 }
1821 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1822
1823 /**
1824  *      register_framebuffer - registers a frame buffer device
1825  *      @fb_info: frame buffer info structure
1826  *
1827  *      Registers a frame buffer device @fb_info.
1828  *
1829  *      Returns negative errno on error, or zero for success.
1830  *
1831  */
1832 int
1833 register_framebuffer(struct fb_info *fb_info)
1834 {
1835         int ret;
1836
1837         mutex_lock(&registration_lock);
1838         ret = do_register_framebuffer(fb_info);
1839         mutex_unlock(&registration_lock);
1840
1841         return ret;
1842 }
1843 EXPORT_SYMBOL(register_framebuffer);
1844
1845 /**
1846  *      unregister_framebuffer - releases a frame buffer device
1847  *      @fb_info: frame buffer info structure
1848  *
1849  *      Unregisters a frame buffer device @fb_info.
1850  *
1851  *      Returns negative errno on error, or zero for success.
1852  *
1853  *      This function will also notify the framebuffer console
1854  *      to release the driver.
1855  *
1856  *      This is meant to be called within a driver's module_exit()
1857  *      function. If this is called outside module_exit(), ensure
1858  *      that the driver implements fb_open() and fb_release() to
1859  *      check that no processes are using the device.
1860  */
1861 void
1862 unregister_framebuffer(struct fb_info *fb_info)
1863 {
1864         mutex_lock(&registration_lock);
1865         do_unregister_framebuffer(fb_info);
1866         mutex_unlock(&registration_lock);
1867 }
1868 EXPORT_SYMBOL(unregister_framebuffer);
1869
1870 /**
1871  *      fb_set_suspend - low level driver signals suspend
1872  *      @info: framebuffer affected
1873  *      @state: 0 = resuming, !=0 = suspending
1874  *
1875  *      This is meant to be used by low level drivers to
1876  *      signal suspend/resume to the core & clients.
1877  *      It must be called with the console semaphore held
1878  */
1879 void fb_set_suspend(struct fb_info *info, int state)
1880 {
1881         WARN_CONSOLE_UNLOCKED();
1882
1883         if (state) {
1884                 fbcon_suspended(info);
1885                 info->state = FBINFO_STATE_SUSPENDED;
1886         } else {
1887                 info->state = FBINFO_STATE_RUNNING;
1888                 fbcon_resumed(info);
1889         }
1890 }
1891 EXPORT_SYMBOL(fb_set_suspend);
1892
1893 /**
1894  *      fbmem_init - init frame buffer subsystem
1895  *
1896  *      Initialize the frame buffer subsystem.
1897  *
1898  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1899  *
1900  */
1901
1902 static int __init
1903 fbmem_init(void)
1904 {
1905         int ret;
1906
1907         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1908                 return -ENOMEM;
1909
1910         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1911         if (ret) {
1912                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1913                 goto err_chrdev;
1914         }
1915
1916         fb_class = class_create(THIS_MODULE, "graphics");
1917         if (IS_ERR(fb_class)) {
1918                 ret = PTR_ERR(fb_class);
1919                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1920                 fb_class = NULL;
1921                 goto err_class;
1922         }
1923
1924         fb_console_init();
1925
1926         return 0;
1927
1928 err_class:
1929         unregister_chrdev(FB_MAJOR, "fb");
1930 err_chrdev:
1931         remove_proc_entry("fb", NULL);
1932         return ret;
1933 }
1934
1935 #ifdef MODULE
1936 module_init(fbmem_init);
1937 static void __exit
1938 fbmem_exit(void)
1939 {
1940         fb_console_exit();
1941
1942         remove_proc_entry("fb", NULL);
1943         class_destroy(fb_class);
1944         unregister_chrdev(FB_MAJOR, "fb");
1945 }
1946
1947 module_exit(fbmem_exit);
1948 MODULE_LICENSE("GPL");
1949 MODULE_DESCRIPTION("Framebuffer base");
1950 #else
1951 subsys_initcall(fbmem_init);
1952 #endif
1953
1954 int fb_new_modelist(struct fb_info *info)
1955 {
1956         struct fb_var_screeninfo var = info->var;
1957         struct list_head *pos, *n;
1958         struct fb_modelist *modelist;
1959         struct fb_videomode *m, mode;
1960         int err = 1;
1961
1962         list_for_each_safe(pos, n, &info->modelist) {
1963                 modelist = list_entry(pos, struct fb_modelist, list);
1964                 m = &modelist->mode;
1965                 fb_videomode_to_var(&var, m);
1966                 var.activate = FB_ACTIVATE_TEST;
1967                 err = fb_set_var(info, &var);
1968                 fb_var_to_videomode(&mode, &var);
1969                 if (err || !fb_mode_is_equal(m, &mode)) {
1970                         list_del(pos);
1971                         kfree(pos);
1972                 }
1973         }
1974
1975         if (list_empty(&info->modelist))
1976                 return 1;
1977
1978         fbcon_new_modelist(info);
1979
1980         return 0;
1981 }
1982
1983 MODULE_LICENSE("GPL");