dd1a708df1a730374cb3f3a28dac2688308981f9
[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_con2fbmap con2fb;
1096         struct fb_cmap cmap_from;
1097         struct fb_cmap_user cmap;
1098         struct fb_event event;
1099         void __user *argp = (void __user *)arg;
1100         long ret = 0;
1101
1102         switch (cmd) {
1103         case FBIOGET_VSCREENINFO:
1104                 lock_fb_info(info);
1105                 var = info->var;
1106                 unlock_fb_info(info);
1107
1108                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1109                 break;
1110         case FBIOPUT_VSCREENINFO:
1111                 if (copy_from_user(&var, argp, sizeof(var)))
1112                         return -EFAULT;
1113                 console_lock();
1114                 lock_fb_info(info);
1115                 info->flags |= FBINFO_MISC_USEREVENT;
1116                 ret = fb_set_var(info, &var);
1117                 info->flags &= ~FBINFO_MISC_USEREVENT;
1118                 unlock_fb_info(info);
1119                 console_unlock();
1120                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1121                         ret = -EFAULT;
1122                 break;
1123         case FBIOGET_FSCREENINFO:
1124                 lock_fb_info(info);
1125                 fix = info->fix;
1126                 if (info->flags & FBINFO_HIDE_SMEM_START)
1127                         fix.smem_start = 0;
1128                 unlock_fb_info(info);
1129
1130                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1131                 break;
1132         case FBIOPUTCMAP:
1133                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1134                         return -EFAULT;
1135                 ret = fb_set_user_cmap(&cmap, info);
1136                 break;
1137         case FBIOGETCMAP:
1138                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1139                         return -EFAULT;
1140                 lock_fb_info(info);
1141                 cmap_from = info->cmap;
1142                 unlock_fb_info(info);
1143                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1144                 break;
1145         case FBIOPAN_DISPLAY:
1146                 if (copy_from_user(&var, argp, sizeof(var)))
1147                         return -EFAULT;
1148                 console_lock();
1149                 lock_fb_info(info);
1150                 ret = fb_pan_display(info, &var);
1151                 unlock_fb_info(info);
1152                 console_unlock();
1153                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1154                         return -EFAULT;
1155                 break;
1156         case FBIO_CURSOR:
1157                 ret = -EINVAL;
1158                 break;
1159         case FBIOGET_CON2FBMAP:
1160                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1161                         return -EFAULT;
1162                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1163                         return -EINVAL;
1164                 con2fb.framebuffer = -1;
1165                 event.data = &con2fb;
1166                 lock_fb_info(info);
1167                 event.info = info;
1168                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1169                 unlock_fb_info(info);
1170                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1171                 break;
1172         case FBIOPUT_CON2FBMAP:
1173                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1174                         return -EFAULT;
1175                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1176                         return -EINVAL;
1177                 if (con2fb.framebuffer >= FB_MAX)
1178                         return -EINVAL;
1179                 if (!registered_fb[con2fb.framebuffer])
1180                         request_module("fb%d", con2fb.framebuffer);
1181                 if (!registered_fb[con2fb.framebuffer]) {
1182                         ret = -EINVAL;
1183                         break;
1184                 }
1185                 event.data = &con2fb;
1186                 console_lock();
1187                 lock_fb_info(info);
1188                 event.info = info;
1189                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1190                 unlock_fb_info(info);
1191                 console_unlock();
1192                 break;
1193         case FBIOBLANK:
1194                 console_lock();
1195                 lock_fb_info(info);
1196                 ret = fb_blank(info, arg);
1197                 /* might again call into fb_blank */
1198                 fbcon_fb_blanked(info, arg);
1199                 unlock_fb_info(info);
1200                 console_unlock();
1201                 break;
1202         default:
1203                 lock_fb_info(info);
1204                 fb = info->fbops;
1205                 if (fb->fb_ioctl)
1206                         ret = fb->fb_ioctl(info, cmd, arg);
1207                 else
1208                         ret = -ENOTTY;
1209                 unlock_fb_info(info);
1210         }
1211         return ret;
1212 }
1213
1214 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1215 {
1216         struct fb_info *info = file_fb_info(file);
1217
1218         if (!info)
1219                 return -ENODEV;
1220         return do_fb_ioctl(info, cmd, arg);
1221 }
1222
1223 #ifdef CONFIG_COMPAT
1224 struct fb_fix_screeninfo32 {
1225         char                    id[16];
1226         compat_caddr_t          smem_start;
1227         u32                     smem_len;
1228         u32                     type;
1229         u32                     type_aux;
1230         u32                     visual;
1231         u16                     xpanstep;
1232         u16                     ypanstep;
1233         u16                     ywrapstep;
1234         u32                     line_length;
1235         compat_caddr_t          mmio_start;
1236         u32                     mmio_len;
1237         u32                     accel;
1238         u16                     reserved[3];
1239 };
1240
1241 struct fb_cmap32 {
1242         u32                     start;
1243         u32                     len;
1244         compat_caddr_t  red;
1245         compat_caddr_t  green;
1246         compat_caddr_t  blue;
1247         compat_caddr_t  transp;
1248 };
1249
1250 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1251                           unsigned long arg)
1252 {
1253         struct fb_cmap_user __user *cmap;
1254         struct fb_cmap32 __user *cmap32;
1255         __u32 data;
1256         int err;
1257
1258         cmap = compat_alloc_user_space(sizeof(*cmap));
1259         cmap32 = compat_ptr(arg);
1260
1261         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1262                 return -EFAULT;
1263
1264         if (get_user(data, &cmap32->red) ||
1265             put_user(compat_ptr(data), &cmap->red) ||
1266             get_user(data, &cmap32->green) ||
1267             put_user(compat_ptr(data), &cmap->green) ||
1268             get_user(data, &cmap32->blue) ||
1269             put_user(compat_ptr(data), &cmap->blue) ||
1270             get_user(data, &cmap32->transp) ||
1271             put_user(compat_ptr(data), &cmap->transp))
1272                 return -EFAULT;
1273
1274         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1275
1276         if (!err) {
1277                 if (copy_in_user(&cmap32->start,
1278                                  &cmap->start,
1279                                  2 * sizeof(__u32)))
1280                         err = -EFAULT;
1281         }
1282         return err;
1283 }
1284
1285 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1286                                   struct fb_fix_screeninfo32 __user *fix32)
1287 {
1288         __u32 data;
1289         int err;
1290
1291         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1292
1293         data = (__u32) (unsigned long) fix->smem_start;
1294         err |= put_user(data, &fix32->smem_start);
1295
1296         err |= put_user(fix->smem_len, &fix32->smem_len);
1297         err |= put_user(fix->type, &fix32->type);
1298         err |= put_user(fix->type_aux, &fix32->type_aux);
1299         err |= put_user(fix->visual, &fix32->visual);
1300         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1301         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1302         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1303         err |= put_user(fix->line_length, &fix32->line_length);
1304
1305         data = (__u32) (unsigned long) fix->mmio_start;
1306         err |= put_user(data, &fix32->mmio_start);
1307
1308         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1309         err |= put_user(fix->accel, &fix32->accel);
1310         err |= copy_to_user(fix32->reserved, fix->reserved,
1311                             sizeof(fix->reserved));
1312
1313         if (err)
1314                 return -EFAULT;
1315         return 0;
1316 }
1317
1318 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1319                               unsigned long arg)
1320 {
1321         struct fb_fix_screeninfo fix;
1322
1323         lock_fb_info(info);
1324         fix = info->fix;
1325         if (info->flags & FBINFO_HIDE_SMEM_START)
1326                 fix.smem_start = 0;
1327         unlock_fb_info(info);
1328         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1329 }
1330
1331 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1332                             unsigned long arg)
1333 {
1334         struct fb_info *info = file_fb_info(file);
1335         struct fb_ops *fb;
1336         long ret = -ENOIOCTLCMD;
1337
1338         if (!info)
1339                 return -ENODEV;
1340         fb = info->fbops;
1341         switch(cmd) {
1342         case FBIOGET_VSCREENINFO:
1343         case FBIOPUT_VSCREENINFO:
1344         case FBIOPAN_DISPLAY:
1345         case FBIOGET_CON2FBMAP:
1346         case FBIOPUT_CON2FBMAP:
1347                 arg = (unsigned long) compat_ptr(arg);
1348                 /* fall through */
1349         case FBIOBLANK:
1350                 ret = do_fb_ioctl(info, cmd, arg);
1351                 break;
1352
1353         case FBIOGET_FSCREENINFO:
1354                 ret = fb_get_fscreeninfo(info, cmd, arg);
1355                 break;
1356
1357         case FBIOGETCMAP:
1358         case FBIOPUTCMAP:
1359                 ret = fb_getput_cmap(info, cmd, arg);
1360                 break;
1361
1362         default:
1363                 if (fb->fb_compat_ioctl)
1364                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1365                 break;
1366         }
1367         return ret;
1368 }
1369 #endif
1370
1371 static int
1372 fb_mmap(struct file *file, struct vm_area_struct * vma)
1373 {
1374         struct fb_info *info = file_fb_info(file);
1375         struct fb_ops *fb;
1376         unsigned long mmio_pgoff;
1377         unsigned long start;
1378         u32 len;
1379
1380         if (!info)
1381                 return -ENODEV;
1382         fb = info->fbops;
1383         mutex_lock(&info->mm_lock);
1384         if (fb->fb_mmap) {
1385                 int res;
1386
1387                 /*
1388                  * The framebuffer needs to be accessed decrypted, be sure
1389                  * SME protection is removed ahead of the call
1390                  */
1391                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1392                 res = fb->fb_mmap(info, vma);
1393                 mutex_unlock(&info->mm_lock);
1394                 return res;
1395         }
1396
1397         /*
1398          * Ugh. This can be either the frame buffer mapping, or
1399          * if pgoff points past it, the mmio mapping.
1400          */
1401         start = info->fix.smem_start;
1402         len = info->fix.smem_len;
1403         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1404         if (vma->vm_pgoff >= mmio_pgoff) {
1405                 if (info->var.accel_flags) {
1406                         mutex_unlock(&info->mm_lock);
1407                         return -EINVAL;
1408                 }
1409
1410                 vma->vm_pgoff -= mmio_pgoff;
1411                 start = info->fix.mmio_start;
1412                 len = info->fix.mmio_len;
1413         }
1414         mutex_unlock(&info->mm_lock);
1415
1416         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1417         /*
1418          * The framebuffer needs to be accessed decrypted, be sure
1419          * SME protection is removed
1420          */
1421         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1422         fb_pgprotect(file, vma, start);
1423
1424         return vm_iomap_memory(vma, start, len);
1425 }
1426
1427 static int
1428 fb_open(struct inode *inode, struct file *file)
1429 __acquires(&info->lock)
1430 __releases(&info->lock)
1431 {
1432         int fbidx = iminor(inode);
1433         struct fb_info *info;
1434         int res = 0;
1435
1436         info = get_fb_info(fbidx);
1437         if (!info) {
1438                 request_module("fb%d", fbidx);
1439                 info = get_fb_info(fbidx);
1440                 if (!info)
1441                         return -ENODEV;
1442         }
1443         if (IS_ERR(info))
1444                 return PTR_ERR(info);
1445
1446         lock_fb_info(info);
1447         if (!try_module_get(info->fbops->owner)) {
1448                 res = -ENODEV;
1449                 goto out;
1450         }
1451         file->private_data = info;
1452         if (info->fbops->fb_open) {
1453                 res = info->fbops->fb_open(info,1);
1454                 if (res)
1455                         module_put(info->fbops->owner);
1456         }
1457 #ifdef CONFIG_FB_DEFERRED_IO
1458         if (info->fbdefio)
1459                 fb_deferred_io_open(info, inode, file);
1460 #endif
1461 out:
1462         unlock_fb_info(info);
1463         if (res)
1464                 put_fb_info(info);
1465         return res;
1466 }
1467
1468 static int 
1469 fb_release(struct inode *inode, struct file *file)
1470 __acquires(&info->lock)
1471 __releases(&info->lock)
1472 {
1473         struct fb_info * const info = file->private_data;
1474
1475         lock_fb_info(info);
1476         if (info->fbops->fb_release)
1477                 info->fbops->fb_release(info,1);
1478         module_put(info->fbops->owner);
1479         unlock_fb_info(info);
1480         put_fb_info(info);
1481         return 0;
1482 }
1483
1484 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1485 unsigned long get_fb_unmapped_area(struct file *filp,
1486                                    unsigned long addr, unsigned long len,
1487                                    unsigned long pgoff, unsigned long flags)
1488 {
1489         struct fb_info * const info = filp->private_data;
1490         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1491
1492         if (pgoff > fb_size || len > fb_size - pgoff)
1493                 return -EINVAL;
1494
1495         return (unsigned long)info->screen_base + pgoff;
1496 }
1497 #endif
1498
1499 static const struct file_operations fb_fops = {
1500         .owner =        THIS_MODULE,
1501         .read =         fb_read,
1502         .write =        fb_write,
1503         .unlocked_ioctl = fb_ioctl,
1504 #ifdef CONFIG_COMPAT
1505         .compat_ioctl = fb_compat_ioctl,
1506 #endif
1507         .mmap =         fb_mmap,
1508         .open =         fb_open,
1509         .release =      fb_release,
1510 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1511         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1512          !defined(CONFIG_MMU))
1513         .get_unmapped_area = get_fb_unmapped_area,
1514 #endif
1515 #ifdef CONFIG_FB_DEFERRED_IO
1516         .fsync =        fb_deferred_io_fsync,
1517 #endif
1518         .llseek =       default_llseek,
1519 };
1520
1521 struct class *fb_class;
1522 EXPORT_SYMBOL(fb_class);
1523
1524 static int fb_check_foreignness(struct fb_info *fi)
1525 {
1526         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1527
1528         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1529
1530 #ifdef __BIG_ENDIAN
1531         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1532 #else
1533         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1534 #endif /* __BIG_ENDIAN */
1535
1536         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1537                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1538                        "support this framebuffer\n", fi->fix.id);
1539                 return -ENOSYS;
1540         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1541                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1542                        "support this framebuffer\n", fi->fix.id);
1543                 return -ENOSYS;
1544         }
1545
1546         return 0;
1547 }
1548
1549 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1550 {
1551         /* is the generic aperture base the same as the HW one */
1552         if (gen->base == hw->base)
1553                 return true;
1554         /* is the generic aperture base inside the hw base->hw base+size */
1555         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1556                 return true;
1557         return false;
1558 }
1559
1560 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1561                                     struct apertures_struct *hwa)
1562 {
1563         int i, j;
1564         if (!hwa || !gena)
1565                 return false;
1566
1567         for (i = 0; i < hwa->count; ++i) {
1568                 struct aperture *h = &hwa->ranges[i];
1569                 for (j = 0; j < gena->count; ++j) {
1570                         struct aperture *g = &gena->ranges[j];
1571                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1572                                 (unsigned long long)g->base,
1573                                 (unsigned long long)g->size,
1574                                 (unsigned long long)h->base,
1575                                 (unsigned long long)h->size);
1576                         if (apertures_overlap(g, h))
1577                                 return true;
1578                 }
1579         }
1580
1581         return false;
1582 }
1583
1584 static void do_unregister_framebuffer(struct fb_info *fb_info);
1585
1586 #define VGA_FB_PHYS 0xA0000
1587 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1588                                                const char *name, bool primary)
1589 {
1590         int i;
1591
1592         /* check all firmware fbs and kick off if the base addr overlaps */
1593         for_each_registered_fb(i) {
1594                 struct apertures_struct *gen_aper;
1595
1596                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1597                         continue;
1598
1599                 gen_aper = registered_fb[i]->apertures;
1600                 if (fb_do_apertures_overlap(gen_aper, a) ||
1601                         (primary && gen_aper && gen_aper->count &&
1602                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1603
1604                         printk(KERN_INFO "fb%d: switching to %s from %s\n",
1605                                i, name, registered_fb[i]->fix.id);
1606                         do_unregister_framebuffer(registered_fb[i]);
1607                 }
1608         }
1609 }
1610
1611 static bool lockless_register_fb;
1612 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1613 MODULE_PARM_DESC(lockless_register_fb,
1614         "Lockless framebuffer registration for debugging [default=off]");
1615
1616 static int do_register_framebuffer(struct fb_info *fb_info)
1617 {
1618         int i, ret;
1619         struct fb_videomode mode;
1620
1621         if (fb_check_foreignness(fb_info))
1622                 return -ENOSYS;
1623
1624         do_remove_conflicting_framebuffers(fb_info->apertures,
1625                                            fb_info->fix.id,
1626                                            fb_is_primary_device(fb_info));
1627
1628         if (num_registered_fb == FB_MAX)
1629                 return -ENXIO;
1630
1631         num_registered_fb++;
1632         for (i = 0 ; i < FB_MAX; i++)
1633                 if (!registered_fb[i])
1634                         break;
1635         fb_info->node = i;
1636         atomic_set(&fb_info->count, 1);
1637         mutex_init(&fb_info->lock);
1638         mutex_init(&fb_info->mm_lock);
1639
1640         fb_info->dev = device_create(fb_class, fb_info->device,
1641                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1642         if (IS_ERR(fb_info->dev)) {
1643                 /* Not fatal */
1644                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1645                 fb_info->dev = NULL;
1646         } else
1647                 fb_init_device(fb_info);
1648
1649         if (fb_info->pixmap.addr == NULL) {
1650                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1651                 if (fb_info->pixmap.addr) {
1652                         fb_info->pixmap.size = FBPIXMAPSIZE;
1653                         fb_info->pixmap.buf_align = 1;
1654                         fb_info->pixmap.scan_align = 1;
1655                         fb_info->pixmap.access_align = 32;
1656                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1657                 }
1658         }       
1659         fb_info->pixmap.offset = 0;
1660
1661         if (!fb_info->pixmap.blit_x)
1662                 fb_info->pixmap.blit_x = ~(u32)0;
1663
1664         if (!fb_info->pixmap.blit_y)
1665                 fb_info->pixmap.blit_y = ~(u32)0;
1666
1667         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1668                 INIT_LIST_HEAD(&fb_info->modelist);
1669
1670         if (fb_info->skip_vt_switch)
1671                 pm_vt_switch_required(fb_info->dev, false);
1672         else
1673                 pm_vt_switch_required(fb_info->dev, true);
1674
1675         fb_var_to_videomode(&mode, &fb_info->var);
1676         fb_add_videomode(&mode, &fb_info->modelist);
1677         registered_fb[i] = fb_info;
1678
1679 #ifdef CONFIG_GUMSTIX_AM200EPD
1680         {
1681                 struct fb_event event;
1682                 event.info = fb_info;
1683                 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1684         }
1685 #endif
1686
1687         if (!lockless_register_fb)
1688                 console_lock();
1689         else
1690                 atomic_inc(&ignore_console_lock_warning);
1691         lock_fb_info(fb_info);
1692         ret = fbcon_fb_registered(fb_info);
1693         unlock_fb_info(fb_info);
1694
1695         if (!lockless_register_fb)
1696                 console_unlock();
1697         else
1698                 atomic_dec(&ignore_console_lock_warning);
1699         return ret;
1700 }
1701
1702 static void unbind_console(struct fb_info *fb_info)
1703 {
1704         int i = fb_info->node;
1705
1706         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1707                 return;
1708
1709         console_lock();
1710         lock_fb_info(fb_info);
1711         fbcon_fb_unbind(fb_info);
1712         unlock_fb_info(fb_info);
1713         console_unlock();
1714 }
1715
1716 void unlink_framebuffer(struct fb_info *fb_info)
1717 {
1718         int i;
1719
1720         i = fb_info->node;
1721         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1722                 return;
1723
1724         if (!fb_info->dev)
1725                 return;
1726
1727         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1728
1729         pm_vt_switch_unregister(fb_info->dev);
1730
1731         unbind_console(fb_info);
1732
1733         fb_info->dev = NULL;
1734 }
1735 EXPORT_SYMBOL(unlink_framebuffer);
1736
1737 static void do_unregister_framebuffer(struct fb_info *fb_info)
1738 {
1739         unlink_framebuffer(fb_info);
1740         if (fb_info->pixmap.addr &&
1741             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1742                 kfree(fb_info->pixmap.addr);
1743         fb_destroy_modelist(&fb_info->modelist);
1744         registered_fb[fb_info->node] = NULL;
1745         num_registered_fb--;
1746         fb_cleanup_device(fb_info);
1747 #ifdef CONFIG_GUMSTIX_AM200EPD
1748         {
1749                 struct fb_event event;
1750                 event.info = fb_info;
1751                 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1752         }
1753 #endif
1754         console_lock();
1755         fbcon_fb_unregistered(fb_info);
1756         console_unlock();
1757
1758         /* this may free fb info */
1759         put_fb_info(fb_info);
1760 }
1761
1762 /**
1763  * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1764  * @a: memory range, users of which are to be removed
1765  * @name: requesting driver name
1766  * @primary: also kick vga16fb if present
1767  *
1768  * This function removes framebuffer devices (initialized by firmware/bootloader)
1769  * which use memory range described by @a. If @a is NULL all such devices are
1770  * removed.
1771  */
1772 int remove_conflicting_framebuffers(struct apertures_struct *a,
1773                                     const char *name, bool primary)
1774 {
1775         bool do_free = false;
1776
1777         if (!a) {
1778                 a = alloc_apertures(1);
1779                 if (!a)
1780                         return -ENOMEM;
1781
1782                 a->ranges[0].base = 0;
1783                 a->ranges[0].size = ~0;
1784                 do_free = true;
1785         }
1786
1787         mutex_lock(&registration_lock);
1788         do_remove_conflicting_framebuffers(a, name, primary);
1789         mutex_unlock(&registration_lock);
1790
1791         if (do_free)
1792                 kfree(a);
1793
1794         return 0;
1795 }
1796 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1797
1798 /**
1799  * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1800  * @pdev: PCI device
1801  * @res_id: index of PCI BAR configuring framebuffer memory
1802  * @name: requesting driver name
1803  *
1804  * This function removes framebuffer devices (eg. initialized by firmware)
1805  * using memory range configured for @pdev's BAR @res_id.
1806  *
1807  * The function assumes that PCI device with shadowed ROM drives a primary
1808  * display and so kicks out vga16fb.
1809  */
1810 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
1811 {
1812         struct apertures_struct *ap;
1813         bool primary = false;
1814         int err, idx, bar;
1815         bool res_id_found = false;
1816
1817         for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1818                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1819                         continue;
1820                 idx++;
1821         }
1822
1823         ap = alloc_apertures(idx);
1824         if (!ap)
1825                 return -ENOMEM;
1826
1827         for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1828                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1829                         continue;
1830                 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1831                 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1832                 pci_info(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1833                          (unsigned long)pci_resource_start(pdev, bar),
1834                          (unsigned long)pci_resource_end(pdev, bar));
1835                 idx++;
1836                 if (res_id == bar)
1837                         res_id_found = true;
1838         }
1839         if (!res_id_found)
1840                 pci_warn(pdev, "%s: passed res_id (%d) is not a memory bar\n",
1841                          __func__, res_id);
1842
1843 #ifdef CONFIG_X86
1844         primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1845                                         IORESOURCE_ROM_SHADOW;
1846 #endif
1847         err = remove_conflicting_framebuffers(ap, name, primary);
1848         kfree(ap);
1849         return err;
1850 }
1851 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1852
1853 /**
1854  *      register_framebuffer - registers a frame buffer device
1855  *      @fb_info: frame buffer info structure
1856  *
1857  *      Registers a frame buffer device @fb_info.
1858  *
1859  *      Returns negative errno on error, or zero for success.
1860  *
1861  */
1862 int
1863 register_framebuffer(struct fb_info *fb_info)
1864 {
1865         int ret;
1866
1867         mutex_lock(&registration_lock);
1868         ret = do_register_framebuffer(fb_info);
1869         mutex_unlock(&registration_lock);
1870
1871         return ret;
1872 }
1873 EXPORT_SYMBOL(register_framebuffer);
1874
1875 /**
1876  *      unregister_framebuffer - releases a frame buffer device
1877  *      @fb_info: frame buffer info structure
1878  *
1879  *      Unregisters a frame buffer device @fb_info.
1880  *
1881  *      Returns negative errno on error, or zero for success.
1882  *
1883  *      This function will also notify the framebuffer console
1884  *      to release the driver.
1885  *
1886  *      This is meant to be called within a driver's module_exit()
1887  *      function. If this is called outside module_exit(), ensure
1888  *      that the driver implements fb_open() and fb_release() to
1889  *      check that no processes are using the device.
1890  */
1891 void
1892 unregister_framebuffer(struct fb_info *fb_info)
1893 {
1894         mutex_lock(&registration_lock);
1895         do_unregister_framebuffer(fb_info);
1896         mutex_unlock(&registration_lock);
1897 }
1898 EXPORT_SYMBOL(unregister_framebuffer);
1899
1900 /**
1901  *      fb_set_suspend - low level driver signals suspend
1902  *      @info: framebuffer affected
1903  *      @state: 0 = resuming, !=0 = suspending
1904  *
1905  *      This is meant to be used by low level drivers to
1906  *      signal suspend/resume to the core & clients.
1907  *      It must be called with the console semaphore held
1908  */
1909 void fb_set_suspend(struct fb_info *info, int state)
1910 {
1911         WARN_CONSOLE_UNLOCKED();
1912
1913         if (state) {
1914                 fbcon_suspended(info);
1915                 info->state = FBINFO_STATE_SUSPENDED;
1916         } else {
1917                 info->state = FBINFO_STATE_RUNNING;
1918                 fbcon_resumed(info);
1919         }
1920 }
1921 EXPORT_SYMBOL(fb_set_suspend);
1922
1923 /**
1924  *      fbmem_init - init frame buffer subsystem
1925  *
1926  *      Initialize the frame buffer subsystem.
1927  *
1928  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1929  *
1930  */
1931
1932 static int __init
1933 fbmem_init(void)
1934 {
1935         int ret;
1936
1937         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1938                 return -ENOMEM;
1939
1940         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1941         if (ret) {
1942                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1943                 goto err_chrdev;
1944         }
1945
1946         fb_class = class_create(THIS_MODULE, "graphics");
1947         if (IS_ERR(fb_class)) {
1948                 ret = PTR_ERR(fb_class);
1949                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1950                 fb_class = NULL;
1951                 goto err_class;
1952         }
1953
1954         fb_console_init();
1955
1956         return 0;
1957
1958 err_class:
1959         unregister_chrdev(FB_MAJOR, "fb");
1960 err_chrdev:
1961         remove_proc_entry("fb", NULL);
1962         return ret;
1963 }
1964
1965 #ifdef MODULE
1966 module_init(fbmem_init);
1967 static void __exit
1968 fbmem_exit(void)
1969 {
1970         fb_console_exit();
1971
1972         remove_proc_entry("fb", NULL);
1973         class_destroy(fb_class);
1974         unregister_chrdev(FB_MAJOR, "fb");
1975 }
1976
1977 module_exit(fbmem_exit);
1978 MODULE_LICENSE("GPL");
1979 MODULE_DESCRIPTION("Framebuffer base");
1980 #else
1981 subsys_initcall(fbmem_init);
1982 #endif
1983
1984 int fb_new_modelist(struct fb_info *info)
1985 {
1986         struct fb_var_screeninfo var = info->var;
1987         struct list_head *pos, *n;
1988         struct fb_modelist *modelist;
1989         struct fb_videomode *m, mode;
1990         int err = 1;
1991
1992         list_for_each_safe(pos, n, &info->modelist) {
1993                 modelist = list_entry(pos, struct fb_modelist, list);
1994                 m = &modelist->mode;
1995                 fb_videomode_to_var(&var, m);
1996                 var.activate = FB_ACTIVATE_TEST;
1997                 err = fb_set_var(info, &var);
1998                 fb_var_to_videomode(&mode, &var);
1999                 if (err || !fb_mode_is_equal(m, &mode)) {
2000                         list_del(pos);
2001                         kfree(pos);
2002                 }
2003         }
2004
2005         if (list_empty(&info->modelist))
2006                 return 1;
2007
2008         fbcon_new_modelist(info);
2009
2010         return 0;
2011 }
2012
2013 MODULE_LICENSE("GPL");