[PATCH] fbdev: fill in the access_align field.
[linux-2.6.git] / drivers / video / fbmem.c
1 /*
2  *  linux/drivers/video/fbmem.c
3  *
4  *  Copyright (C) 1994 Martin Schaller
5  *
6  *      2001 - Documented with DocBook
7  *      - Brad Douglas <brad@neruo.com>
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive
11  * for more details.
12  */
13
14 #include <linux/config.h>
15 #include <linux/module.h>
16
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/sched.h>
20 #include <linux/smp_lock.h>
21 #include <linux/kernel.h>
22 #include <linux/major.h>
23 #include <linux/slab.h>
24 #include <linux/mm.h>
25 #include <linux/mman.h>
26 #include <linux/tty.h>
27 #include <linux/init.h>
28 #include <linux/linux_logo.h>
29 #include <linux/proc_fs.h>
30 #include <linux/console.h>
31 #ifdef CONFIG_KMOD
32 #include <linux/kmod.h>
33 #endif
34 #include <linux/devfs_fs_kernel.h>
35 #include <linux/err.h>
36 #include <linux/kernel.h>
37 #include <linux/device.h>
38 #include <linux/efi.h>
39
40 #if defined(__mc68000__) || defined(CONFIG_APUS)
41 #include <asm/setup.h>
42 #endif
43
44 #include <asm/io.h>
45 #include <asm/uaccess.h>
46 #include <asm/page.h>
47 #include <asm/pgtable.h>
48
49 #include <linux/fb.h>
50
51     /*
52      *  Frame buffer device initialization and setup routines
53      */
54
55 #define FBPIXMAPSIZE    (1024 * 8)
56
57 static struct notifier_block *fb_notifier_list;
58 struct fb_info *registered_fb[FB_MAX];
59 int num_registered_fb;
60
61 /*
62  * Helpers
63  */
64
65 int fb_get_color_depth(struct fb_var_screeninfo *var)
66 {
67         if (var->green.length == var->blue.length &&
68             var->green.length == var->red.length &&
69             !var->green.offset && !var->blue.offset &&
70             !var->red.offset)
71                 return var->green.length;
72         else
73                 return (var->green.length + var->red.length +
74                         var->blue.length);
75 }
76 EXPORT_SYMBOL(fb_get_color_depth);
77
78 /*
79  * Data padding functions.
80  */
81 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
82 {
83         int i;
84
85         for (i = height; i--; ) {
86                 memcpy(dst, src, s_pitch);
87                 src += s_pitch;
88                 dst += d_pitch;
89         }
90 }
91 EXPORT_SYMBOL(fb_pad_aligned_buffer);
92
93 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
94                                 u32 shift_high, u32 shift_low, u32 mod)
95 {
96         u8 mask = (u8) (0xfff << shift_high), tmp;
97         int i, j;
98
99         for (i = height; i--; ) {
100                 for (j = 0; j < idx; j++) {
101                         tmp = dst[j];
102                         tmp &= mask;
103                         tmp |= *src >> shift_low;
104                         dst[j] = tmp;
105                         tmp = *src << shift_high;
106                         dst[j+1] = tmp;
107                         src++;
108                 }
109                 tmp = dst[idx];
110                 tmp &= mask;
111                 tmp |= *src >> shift_low;
112                 dst[idx] = tmp;
113                 if (shift_high < mod) {
114                         tmp = *src << shift_high;
115                         dst[idx+1] = tmp;
116                 }
117                 src++;
118                 dst += d_pitch;
119         }
120 }
121 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
122
123 /*
124  * we need to lock this section since fb_cursor
125  * may use fb_imageblit()
126  */
127 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
128 {
129         u32 align = buf->buf_align - 1, offset;
130         char *addr = buf->addr;
131
132         /* If IO mapped, we need to sync before access, no sharing of
133          * the pixmap is done
134          */
135         if (buf->flags & FB_PIXMAP_IO) {
136                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
137                         info->fbops->fb_sync(info);
138                 return addr;
139         }
140
141         /* See if we fit in the remaining pixmap space */
142         offset = buf->offset + align;
143         offset &= ~align;
144         if (offset + size > buf->size) {
145                 /* We do not fit. In order to be able to re-use the buffer,
146                  * we must ensure no asynchronous DMA'ing or whatever operation
147                  * is in progress, we sync for that.
148                  */
149                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
150                         info->fbops->fb_sync(info);
151                 offset = 0;
152         }
153         buf->offset = offset + size;
154         addr += offset;
155
156         return addr;
157 }
158
159 #ifdef CONFIG_LOGO
160 #include <linux/linux_logo.h>
161
162 static inline unsigned safe_shift(unsigned d, int n)
163 {
164         return n < 0 ? d >> -n : d << n;
165 }
166
167 static void fb_set_logocmap(struct fb_info *info,
168                                    const struct linux_logo *logo)
169 {
170         struct fb_cmap palette_cmap;
171         u16 palette_green[16];
172         u16 palette_blue[16];
173         u16 palette_red[16];
174         int i, j, n;
175         const unsigned char *clut = logo->clut;
176
177         palette_cmap.start = 0;
178         palette_cmap.len = 16;
179         palette_cmap.red = palette_red;
180         palette_cmap.green = palette_green;
181         palette_cmap.blue = palette_blue;
182         palette_cmap.transp = NULL;
183
184         for (i = 0; i < logo->clutsize; i += n) {
185                 n = logo->clutsize - i;
186                 /* palette_cmap provides space for only 16 colors at once */
187                 if (n > 16)
188                         n = 16;
189                 palette_cmap.start = 32 + i;
190                 palette_cmap.len = n;
191                 for (j = 0; j < n; ++j) {
192                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
193                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
194                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
195                         clut += 3;
196                 }
197                 fb_set_cmap(&palette_cmap, info);
198         }
199 }
200
201 static void  fb_set_logo_truepalette(struct fb_info *info,
202                                             const struct linux_logo *logo,
203                                             u32 *palette)
204 {
205         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
206         unsigned char redmask, greenmask, bluemask;
207         int redshift, greenshift, blueshift;
208         int i;
209         const unsigned char *clut = logo->clut;
210
211         /*
212          * We have to create a temporary palette since console palette is only
213          * 16 colors long.
214          */
215         /* Bug: Doesn't obey msb_right ... (who needs that?) */
216         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
217         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
218         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
219         redshift   = info->var.red.offset   - (8 - info->var.red.length);
220         greenshift = info->var.green.offset - (8 - info->var.green.length);
221         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
222
223         for ( i = 0; i < logo->clutsize; i++) {
224                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
225                                  safe_shift((clut[1] & greenmask), greenshift) |
226                                  safe_shift((clut[2] & bluemask), blueshift));
227                 clut += 3;
228         }
229 }
230
231 static void fb_set_logo_directpalette(struct fb_info *info,
232                                              const struct linux_logo *logo,
233                                              u32 *palette)
234 {
235         int redshift, greenshift, blueshift;
236         int i;
237
238         redshift = info->var.red.offset;
239         greenshift = info->var.green.offset;
240         blueshift = info->var.blue.offset;
241
242         for (i = 32; i < logo->clutsize; i++)
243                 palette[i] = i << redshift | i << greenshift | i << blueshift;
244 }
245
246 static void fb_set_logo(struct fb_info *info,
247                                const struct linux_logo *logo, u8 *dst,
248                                int depth)
249 {
250         int i, j, k, fg = 1;
251         const u8 *src = logo->data;
252         u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
253
254         if (fb_get_color_depth(&info->var) == 3)
255                 fg = 7;
256
257         switch (depth) {
258         case 4:
259                 for (i = 0; i < logo->height; i++)
260                         for (j = 0; j < logo->width; src++) {
261                                 *dst++ = *src >> 4;
262                                 j++;
263                                 if (j < logo->width) {
264                                         *dst++ = *src & 0x0f;
265                                         j++;
266                                 }
267                         }
268                 break;
269         case 1:
270                 for (i = 0; i < logo->height; i++) {
271                         for (j = 0; j < logo->width; src++) {
272                                 d = *src ^ xor;
273                                 for (k = 7; k >= 0; k--) {
274                                         *dst++ = ((d >> k) & 1) ? fg : 0;
275                                         j++;
276                                 }
277                         }
278                 }
279                 break;
280         }
281 }
282
283 /*
284  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
285  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
286  * the visual format and color depth of the framebuffer, the DAC, the
287  * pseudo_palette, and the logo data will be adjusted accordingly.
288  *
289  * Case 1 - linux_logo_clut224:
290  * Color exceeds the number of console colors (16), thus we set the hardware DAC
291  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
292  *
293  * For visuals that require color info from the pseudo_palette, we also construct
294  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
295  * will be set.
296  *
297  * Case 2 - linux_logo_vga16:
298  * The number of colors just matches the console colors, thus there is no need
299  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
300  * each byte contains color information for two pixels (upper and lower nibble).
301  * To be consistent with fb_imageblit() usage, we therefore separate the two
302  * nibbles into separate bytes. The "depth" flag will be set to 4.
303  *
304  * Case 3 - linux_logo_mono:
305  * This is similar with Case 2.  Each byte contains information for 8 pixels.
306  * We isolate each bit and expand each into a byte. The "depth" flag will
307  * be set to 1.
308  */
309 static struct logo_data {
310         int depth;
311         int needs_directpalette;
312         int needs_truepalette;
313         int needs_cmapreset;
314         const struct linux_logo *logo;
315 } fb_logo;
316
317 int fb_prepare_logo(struct fb_info *info)
318 {
319         int depth = fb_get_color_depth(&info->var);
320
321         memset(&fb_logo, 0, sizeof(struct logo_data));
322
323         if (info->flags & FBINFO_MISC_TILEBLITTING)
324                 return 0;
325
326         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
327                 depth = info->var.blue.length;
328                 if (info->var.red.length < depth)
329                         depth = info->var.red.length;
330                 if (info->var.green.length < depth)
331                         depth = info->var.green.length;
332         }
333
334         if (depth >= 8) {
335                 switch (info->fix.visual) {
336                 case FB_VISUAL_TRUECOLOR:
337                         fb_logo.needs_truepalette = 1;
338                         break;
339                 case FB_VISUAL_DIRECTCOLOR:
340                         fb_logo.needs_directpalette = 1;
341                         fb_logo.needs_cmapreset = 1;
342                         break;
343                 case FB_VISUAL_PSEUDOCOLOR:
344                         fb_logo.needs_cmapreset = 1;
345                         break;
346                 }
347         }
348
349         /* Return if no suitable logo was found */
350         fb_logo.logo = fb_find_logo(depth);
351         
352         if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
353                 fb_logo.logo = NULL;
354                 return 0;
355         }
356         /* What depth we asked for might be different from what we get */
357         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
358                 fb_logo.depth = 8;
359         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
360                 fb_logo.depth = 4;
361         else
362                 fb_logo.depth = 1;              
363         return fb_logo.logo->height;
364 }
365
366 int fb_show_logo(struct fb_info *info)
367 {
368         u32 *palette = NULL, *saved_pseudo_palette = NULL;
369         unsigned char *logo_new = NULL;
370         struct fb_image image;
371         int x;
372
373         /* Return if the frame buffer is not mapped or suspended */
374         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
375                 return 0;
376
377         image.depth = 8;
378         image.data = fb_logo.logo->data;
379
380         if (fb_logo.needs_cmapreset)
381                 fb_set_logocmap(info, fb_logo.logo);
382
383         if (fb_logo.needs_truepalette || 
384             fb_logo.needs_directpalette) {
385                 palette = kmalloc(256 * 4, GFP_KERNEL);
386                 if (palette == NULL)
387                         return 0;
388
389                 if (fb_logo.needs_truepalette)
390                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
391                 else
392                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
393
394                 saved_pseudo_palette = info->pseudo_palette;
395                 info->pseudo_palette = palette;
396         }
397
398         if (fb_logo.depth <= 4) {
399                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height, 
400                                    GFP_KERNEL);
401                 if (logo_new == NULL) {
402                         kfree(palette);
403                         if (saved_pseudo_palette)
404                                 info->pseudo_palette = saved_pseudo_palette;
405                         return 0;
406                 }
407                 image.data = logo_new;
408                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
409         }
410
411         image.width = fb_logo.logo->width;
412         image.height = fb_logo.logo->height;
413         image.dy = 0;
414
415         for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
416              x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
417                 image.dx = x;
418                 info->fbops->fb_imageblit(info, &image);
419         }
420         
421         kfree(palette);
422         if (saved_pseudo_palette != NULL)
423                 info->pseudo_palette = saved_pseudo_palette;
424         kfree(logo_new);
425         return fb_logo.logo->height;
426 }
427 #else
428 int fb_prepare_logo(struct fb_info *info) { return 0; }
429 int fb_show_logo(struct fb_info *info) { return 0; }
430 #endif /* CONFIG_LOGO */
431
432 static int fbmem_read_proc(char *buf, char **start, off_t offset,
433                            int len, int *eof, void *private)
434 {
435         struct fb_info **fi;
436         int clen;
437
438         clen = 0;
439         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
440                 if (*fi)
441                         clen += sprintf(buf + clen, "%d %s\n",
442                                         (*fi)->node,
443                                         (*fi)->fix.id);
444         *start = buf + offset;
445         if (clen > offset)
446                 clen -= offset;
447         else
448                 clen = 0;
449         return clen < len ? clen : len;
450 }
451
452 static ssize_t
453 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
454 {
455         unsigned long p = *ppos;
456         struct inode *inode = file->f_dentry->d_inode;
457         int fbidx = iminor(inode);
458         struct fb_info *info = registered_fb[fbidx];
459         u32 *buffer, *dst;
460         u32 __iomem *src;
461         int c, i, cnt = 0, err = 0;
462         unsigned long total_size;
463
464         if (!info || ! info->screen_base)
465                 return -ENODEV;
466
467         if (info->state != FBINFO_STATE_RUNNING)
468                 return -EPERM;
469
470         if (info->fbops->fb_read)
471                 return info->fbops->fb_read(file, buf, count, ppos);
472         
473         total_size = info->screen_size;
474         if (total_size == 0)
475                 total_size = info->fix.smem_len;
476
477         if (p >= total_size)
478             return 0;
479         if (count >= total_size)
480             count = total_size;
481         if (count + p > total_size)
482                 count = total_size - p;
483
484         cnt = 0;
485         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
486                          GFP_KERNEL);
487         if (!buffer)
488                 return -ENOMEM;
489
490         src = (u32 __iomem *) (info->screen_base + p);
491
492         if (info->fbops->fb_sync)
493                 info->fbops->fb_sync(info);
494
495         while (count) {
496                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
497                 dst = buffer;
498                 for (i = c >> 2; i--; )
499                         *dst++ = fb_readl(src++);
500                 if (c & 3) {
501                         u8 *dst8 = (u8 *) dst;
502                         u8 __iomem *src8 = (u8 __iomem *) src;
503
504                         for (i = c & 3; i--;)
505                                 *dst8++ = fb_readb(src8++);
506
507                         src = (u32 __iomem *) src8;
508                 }
509
510                 if (copy_to_user(buf, buffer, c)) {
511                         err = -EFAULT;
512                         break;
513                 }
514                 *ppos += c;
515                 buf += c;
516                 cnt += c;
517                 count -= c;
518         }
519
520         kfree(buffer);
521         return (err) ? err : cnt;
522 }
523
524 static ssize_t
525 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
526 {
527         unsigned long p = *ppos;
528         struct inode *inode = file->f_dentry->d_inode;
529         int fbidx = iminor(inode);
530         struct fb_info *info = registered_fb[fbidx];
531         u32 *buffer, *src;
532         u32 __iomem *dst;
533         int c, i, cnt = 0, err;
534         unsigned long total_size;
535
536         if (!info || !info->screen_base)
537                 return -ENODEV;
538
539         if (info->state != FBINFO_STATE_RUNNING)
540                 return -EPERM;
541
542         if (info->fbops->fb_write)
543                 return info->fbops->fb_write(file, buf, count, ppos);
544         
545         total_size = info->screen_size;
546         if (total_size == 0)
547                 total_size = info->fix.smem_len;
548
549         if (p > total_size)
550             return -ENOSPC;
551         if (count >= total_size)
552             count = total_size;
553         err = 0;
554         if (count + p > total_size) {
555             count = total_size - p;
556             err = -ENOSPC;
557         }
558         cnt = 0;
559         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
560                          GFP_KERNEL);
561         if (!buffer)
562                 return -ENOMEM;
563
564         dst = (u32 __iomem *) (info->screen_base + p);
565
566         if (info->fbops->fb_sync)
567                 info->fbops->fb_sync(info);
568
569         while (count) {
570                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
571                 src = buffer;
572                 if (copy_from_user(src, buf, c)) {
573                         err = -EFAULT;
574                         break;
575                 }
576                 for (i = c >> 2; i--; )
577                         fb_writel(*src++, dst++);
578                 if (c & 3) {
579                         u8 *src8 = (u8 *) src;
580                         u8 __iomem *dst8 = (u8 __iomem *) dst;
581
582                         for (i = c & 3; i--; )
583                                 fb_writeb(*src8++, dst8++);
584
585                         dst = (u32 __iomem *) dst8;
586                 }
587                 *ppos += c;
588                 buf += c;
589                 cnt += c;
590                 count -= c;
591         }
592         kfree(buffer);
593
594         return (err) ? err : cnt;
595 }
596
597 #ifdef CONFIG_KMOD
598 static void try_to_load(int fb)
599 {
600         request_module("fb%d", fb);
601 }
602 #endif /* CONFIG_KMOD */
603
604 int
605 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
606 {
607         int xoffset = var->xoffset;
608         int yoffset = var->yoffset;
609         int err;
610
611         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
612             xoffset + info->var.xres > info->var.xres_virtual ||
613             yoffset + info->var.yres > info->var.yres_virtual)
614                 return -EINVAL;
615         if ((err = info->fbops->fb_pan_display(var, info)))
616                 return err;
617         info->var.xoffset = var->xoffset;
618         info->var.yoffset = var->yoffset;
619         if (var->vmode & FB_VMODE_YWRAP)
620                 info->var.vmode |= FB_VMODE_YWRAP;
621         else
622                 info->var.vmode &= ~FB_VMODE_YWRAP;
623         return 0;
624 }
625
626 int
627 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
628 {
629         int err;
630
631         if (var->activate & FB_ACTIVATE_INV_MODE) {
632                 struct fb_videomode mode1, mode2;
633                 int ret = 0;
634
635                 fb_var_to_videomode(&mode1, var);
636                 fb_var_to_videomode(&mode2, &info->var);
637                 /* make sure we don't delete the videomode of current var */
638                 ret = fb_mode_is_equal(&mode1, &mode2);
639
640                 if (!ret) {
641                     struct fb_event event;
642
643                     event.info = info;
644                     event.data = &mode1;
645                     ret = notifier_call_chain(&fb_notifier_list,
646                                               FB_EVENT_MODE_DELETE, &event);
647                 }
648
649                 if (!ret)
650                     fb_delete_videomode(&mode1, &info->modelist);
651
652                 return ret;
653         }
654
655         if ((var->activate & FB_ACTIVATE_FORCE) ||
656             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
657                 if (!info->fbops->fb_check_var) {
658                         *var = info->var;
659                         return 0;
660                 }
661
662                 if ((err = info->fbops->fb_check_var(var, info)))
663                         return err;
664
665                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
666                         struct fb_videomode mode;
667                         int err = 0;
668
669                         info->var = *var;
670                         if (info->fbops->fb_set_par)
671                                 info->fbops->fb_set_par(info);
672
673                         fb_pan_display(info, &info->var);
674
675                         fb_set_cmap(&info->cmap, info);
676
677                         fb_var_to_videomode(&mode, &info->var);
678
679                         if (info->modelist.prev && info->modelist.next &&
680                             !list_empty(&info->modelist))
681                                 err = fb_add_videomode(&mode, &info->modelist);
682
683                         if (!err && info->flags & FBINFO_MISC_USEREVENT) {
684                                 struct fb_event event;
685
686                                 info->flags &= ~FBINFO_MISC_USEREVENT;
687                                 event.info = info;
688                                 notifier_call_chain(&fb_notifier_list,
689                                                     FB_EVENT_MODE_CHANGE,
690                                                     &event);
691                         }
692                 }
693         }
694         return 0;
695 }
696
697 int
698 fb_blank(struct fb_info *info, int blank)
699 {       
700         int ret = -EINVAL;
701
702         if (blank > FB_BLANK_POWERDOWN)
703                 blank = FB_BLANK_POWERDOWN;
704
705         if (info->fbops->fb_blank)
706                 ret = info->fbops->fb_blank(blank, info);
707
708         if (!ret) {
709                 struct fb_event event;
710
711                 event.info = info;
712                 event.data = &blank;
713                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
714         }
715
716         return ret;
717 }
718
719 static int 
720 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
721          unsigned long arg)
722 {
723         int fbidx = iminor(inode);
724         struct fb_info *info = registered_fb[fbidx];
725         struct fb_ops *fb = info->fbops;
726         struct fb_var_screeninfo var;
727         struct fb_fix_screeninfo fix;
728         struct fb_con2fbmap con2fb;
729         struct fb_cmap_user cmap;
730         struct fb_event event;
731         void __user *argp = (void __user *)arg;
732         int i;
733         
734         if (!fb)
735                 return -ENODEV;
736         switch (cmd) {
737         case FBIOGET_VSCREENINFO:
738                 return copy_to_user(argp, &info->var,
739                                     sizeof(var)) ? -EFAULT : 0;
740         case FBIOPUT_VSCREENINFO:
741                 if (copy_from_user(&var, argp, sizeof(var)))
742                         return -EFAULT;
743                 acquire_console_sem();
744                 info->flags |= FBINFO_MISC_USEREVENT;
745                 i = fb_set_var(info, &var);
746                 info->flags &= ~FBINFO_MISC_USEREVENT;
747                 release_console_sem();
748                 if (i) return i;
749                 if (copy_to_user(argp, &var, sizeof(var)))
750                         return -EFAULT;
751                 return 0;
752         case FBIOGET_FSCREENINFO:
753                 return copy_to_user(argp, &info->fix,
754                                     sizeof(fix)) ? -EFAULT : 0;
755         case FBIOPUTCMAP:
756                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
757                         return -EFAULT;
758                 return (fb_set_user_cmap(&cmap, info));
759         case FBIOGETCMAP:
760                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
761                         return -EFAULT;
762                 return fb_cmap_to_user(&info->cmap, &cmap);
763         case FBIOPAN_DISPLAY:
764                 if (copy_from_user(&var, argp, sizeof(var)))
765                         return -EFAULT;
766                 acquire_console_sem();
767                 i = fb_pan_display(info, &var);
768                 release_console_sem();
769                 if (i)
770                         return i;
771                 if (copy_to_user(argp, &var, sizeof(var)))
772                         return -EFAULT;
773                 return 0;
774         case FBIO_CURSOR:
775                 return -EINVAL;
776         case FBIOGET_CON2FBMAP:
777                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
778                         return -EFAULT;
779                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
780                     return -EINVAL;
781                 con2fb.framebuffer = -1;
782                 event.info = info;
783                 event.data = &con2fb;
784                 notifier_call_chain(&fb_notifier_list,
785                                     FB_EVENT_GET_CONSOLE_MAP, &event);
786                 return copy_to_user(argp, &con2fb,
787                                     sizeof(con2fb)) ? -EFAULT : 0;
788         case FBIOPUT_CON2FBMAP:
789                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
790                         return - EFAULT;
791                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
792                     return -EINVAL;
793                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
794                     return -EINVAL;
795 #ifdef CONFIG_KMOD
796                 if (!registered_fb[con2fb.framebuffer])
797                     try_to_load(con2fb.framebuffer);
798 #endif /* CONFIG_KMOD */
799                 if (!registered_fb[con2fb.framebuffer])
800                     return -EINVAL;
801                 event.info = info;
802                 event.data = &con2fb;
803                 return notifier_call_chain(&fb_notifier_list,
804                                            FB_EVENT_SET_CONSOLE_MAP,
805                                            &event);
806         case FBIOBLANK:
807                 acquire_console_sem();
808                 info->flags |= FBINFO_MISC_USEREVENT;
809                 i = fb_blank(info, arg);
810                 info->flags &= ~FBINFO_MISC_USEREVENT;
811                 release_console_sem();
812                 return i;
813         default:
814                 if (fb->fb_ioctl == NULL)
815                         return -EINVAL;
816                 return fb->fb_ioctl(inode, file, cmd, arg, info);
817         }
818 }
819
820 #ifdef CONFIG_COMPAT
821 static long
822 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
823 {
824         int fbidx = iminor(file->f_dentry->d_inode);
825         struct fb_info *info = registered_fb[fbidx];
826         struct fb_ops *fb = info->fbops;
827         long ret;
828
829         if (fb->fb_compat_ioctl == NULL)
830                 return -ENOIOCTLCMD;
831         lock_kernel();
832         ret = fb->fb_compat_ioctl(file, cmd, arg, info);
833         unlock_kernel();
834         return ret;
835 }
836 #endif
837
838 static int 
839 fb_mmap(struct file *file, struct vm_area_struct * vma)
840 {
841         int fbidx = iminor(file->f_dentry->d_inode);
842         struct fb_info *info = registered_fb[fbidx];
843         struct fb_ops *fb = info->fbops;
844         unsigned long off;
845 #if !defined(__sparc__) || defined(__sparc_v9__)
846         unsigned long start;
847         u32 len;
848 #endif
849
850         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
851                 return -EINVAL;
852         off = vma->vm_pgoff << PAGE_SHIFT;
853         if (!fb)
854                 return -ENODEV;
855         if (fb->fb_mmap) {
856                 int res;
857                 lock_kernel();
858                 res = fb->fb_mmap(info, file, vma);
859                 unlock_kernel();
860                 return res;
861         }
862
863 #if defined(__sparc__) && !defined(__sparc_v9__)
864         /* Should never get here, all fb drivers should have their own
865            mmap routines */
866         return -EINVAL;
867 #else
868         /* !sparc32... */
869         lock_kernel();
870
871         /* frame buffer memory */
872         start = info->fix.smem_start;
873         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
874         if (off >= len) {
875                 /* memory mapped io */
876                 off -= len;
877                 if (info->var.accel_flags) {
878                         unlock_kernel();
879                         return -EINVAL;
880                 }
881                 start = info->fix.mmio_start;
882                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
883         }
884         unlock_kernel();
885         start &= PAGE_MASK;
886         if ((vma->vm_end - vma->vm_start + off) > len)
887                 return -EINVAL;
888         off += start;
889         vma->vm_pgoff = off >> PAGE_SHIFT;
890         /* This is an IO map - tell maydump to skip this VMA */
891         vma->vm_flags |= VM_IO | VM_RESERVED;
892 #if defined(__sparc_v9__)
893         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
894                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
895                 return -EAGAIN;
896 #else
897 #if defined(__mc68000__)
898 #if defined(CONFIG_SUN3)
899         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
900 #elif defined(CONFIG_MMU)
901         if (CPU_IS_020_OR_030)
902                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
903         if (CPU_IS_040_OR_060) {
904                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
905                 /* Use no-cache mode, serialized */
906                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
907         }
908 #endif
909 #elif defined(__powerpc__)
910         vma->vm_page_prot = phys_mem_access_prot(file, off,
911                                                  vma->vm_end - vma->vm_start,
912                                                  vma->vm_page_prot);
913 #elif defined(__alpha__)
914         /* Caching is off in the I/O space quadrant by design.  */
915 #elif defined(__i386__) || defined(__x86_64__)
916         if (boot_cpu_data.x86 > 3)
917                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
918 #elif defined(__mips__)
919         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
920 #elif defined(__hppa__)
921         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
922 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
923         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
924 #elif defined(__ia64__)
925         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
926                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
927         else
928                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
929 #else
930 #warning What do we have to do here??
931 #endif
932         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
933                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
934                 return -EAGAIN;
935 #endif /* !__sparc_v9__ */
936         return 0;
937 #endif /* !sparc32 */
938 }
939
940 static int
941 fb_open(struct inode *inode, struct file *file)
942 {
943         int fbidx = iminor(inode);
944         struct fb_info *info;
945         int res = 0;
946
947         if (fbidx >= FB_MAX)
948                 return -ENODEV;
949 #ifdef CONFIG_KMOD
950         if (!(info = registered_fb[fbidx]))
951                 try_to_load(fbidx);
952 #endif /* CONFIG_KMOD */
953         if (!(info = registered_fb[fbidx]))
954                 return -ENODEV;
955         if (!try_module_get(info->fbops->owner))
956                 return -ENODEV;
957         if (info->fbops->fb_open) {
958                 res = info->fbops->fb_open(info,1);
959                 if (res)
960                         module_put(info->fbops->owner);
961         }
962         return res;
963 }
964
965 static int 
966 fb_release(struct inode *inode, struct file *file)
967 {
968         int fbidx = iminor(inode);
969         struct fb_info *info;
970
971         lock_kernel();
972         info = registered_fb[fbidx];
973         if (info->fbops->fb_release)
974                 info->fbops->fb_release(info,1);
975         module_put(info->fbops->owner);
976         unlock_kernel();
977         return 0;
978 }
979
980 static struct file_operations fb_fops = {
981         .owner =        THIS_MODULE,
982         .read =         fb_read,
983         .write =        fb_write,
984         .ioctl =        fb_ioctl,
985 #ifdef CONFIG_COMPAT
986         .compat_ioctl = fb_compat_ioctl,
987 #endif
988         .mmap =         fb_mmap,
989         .open =         fb_open,
990         .release =      fb_release,
991 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
992         .get_unmapped_area = get_fb_unmapped_area,
993 #endif
994 };
995
996 static struct class *fb_class;
997
998 /**
999  *      register_framebuffer - registers a frame buffer device
1000  *      @fb_info: frame buffer info structure
1001  *
1002  *      Registers a frame buffer device @fb_info.
1003  *
1004  *      Returns negative errno on error, or zero for success.
1005  *
1006  */
1007
1008 int
1009 register_framebuffer(struct fb_info *fb_info)
1010 {
1011         int i;
1012         struct fb_event event;
1013
1014         if (num_registered_fb == FB_MAX)
1015                 return -ENXIO;
1016         num_registered_fb++;
1017         for (i = 0 ; i < FB_MAX; i++)
1018                 if (!registered_fb[i])
1019                         break;
1020         fb_info->node = i;
1021
1022         fb_info->class_device = class_device_create(fb_class, MKDEV(FB_MAJOR, i),
1023                                     fb_info->device, "fb%d", i);
1024         if (IS_ERR(fb_info->class_device)) {
1025                 /* Not fatal */
1026                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1027                 fb_info->class_device = NULL;
1028         } else
1029                 fb_init_class_device(fb_info);
1030
1031         if (fb_info->pixmap.addr == NULL) {
1032                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1033                 if (fb_info->pixmap.addr) {
1034                         fb_info->pixmap.size = FBPIXMAPSIZE;
1035                         fb_info->pixmap.buf_align = 1;
1036                         fb_info->pixmap.scan_align = 1;
1037                         fb_info->pixmap.access_align = 32;
1038                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1039                 }
1040         }       
1041         fb_info->pixmap.offset = 0;
1042
1043         if (!fb_info->modelist.prev ||
1044             !fb_info->modelist.next ||
1045             list_empty(&fb_info->modelist)) {
1046                 struct fb_videomode mode;
1047
1048                 INIT_LIST_HEAD(&fb_info->modelist);
1049                 fb_var_to_videomode(&mode, &fb_info->var);
1050                 fb_add_videomode(&mode, &fb_info->modelist);
1051         }
1052
1053         registered_fb[i] = fb_info;
1054
1055         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1056                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1057         event.info = fb_info;
1058         notifier_call_chain(&fb_notifier_list,
1059                             FB_EVENT_FB_REGISTERED, &event);
1060         return 0;
1061 }
1062
1063
1064 /**
1065  *      unregister_framebuffer - releases a frame buffer device
1066  *      @fb_info: frame buffer info structure
1067  *
1068  *      Unregisters a frame buffer device @fb_info.
1069  *
1070  *      Returns negative errno on error, or zero for success.
1071  *
1072  */
1073
1074 int
1075 unregister_framebuffer(struct fb_info *fb_info)
1076 {
1077         int i;
1078
1079         i = fb_info->node;
1080         if (!registered_fb[i])
1081                 return -EINVAL;
1082         devfs_remove("fb/%d", i);
1083
1084         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1085                 kfree(fb_info->pixmap.addr);
1086         fb_destroy_modelist(&fb_info->modelist);
1087         registered_fb[i]=NULL;
1088         num_registered_fb--;
1089         fb_cleanup_class_device(fb_info);
1090         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1091         return 0;
1092 }
1093
1094 /**
1095  *      fb_register_client - register a client notifier
1096  *      @nb: notifier block to callback on events
1097  */
1098 int fb_register_client(struct notifier_block *nb)
1099 {
1100         return notifier_chain_register(&fb_notifier_list, nb);
1101 }
1102
1103 /**
1104  *      fb_unregister_client - unregister a client notifier
1105  *      @nb: notifier block to callback on events
1106  */
1107 int fb_unregister_client(struct notifier_block *nb)
1108 {
1109         return notifier_chain_unregister(&fb_notifier_list, nb);
1110 }
1111
1112 /**
1113  *      fb_set_suspend - low level driver signals suspend
1114  *      @info: framebuffer affected
1115  *      @state: 0 = resuming, !=0 = suspending
1116  *
1117  *      This is meant to be used by low level drivers to
1118  *      signal suspend/resume to the core & clients.
1119  *      It must be called with the console semaphore held
1120  */
1121 void fb_set_suspend(struct fb_info *info, int state)
1122 {
1123         struct fb_event event;
1124
1125         event.info = info;
1126         if (state) {
1127                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1128                 info->state = FBINFO_STATE_SUSPENDED;
1129         } else {
1130                 info->state = FBINFO_STATE_RUNNING;
1131                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1132         }
1133 }
1134
1135 /**
1136  *      fbmem_init - init frame buffer subsystem
1137  *
1138  *      Initialize the frame buffer subsystem.
1139  *
1140  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1141  *
1142  */
1143
1144 static int __init
1145 fbmem_init(void)
1146 {
1147         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1148
1149         devfs_mk_dir("fb");
1150         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1151                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1152
1153         fb_class = class_create(THIS_MODULE, "graphics");
1154         if (IS_ERR(fb_class)) {
1155                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1156                 fb_class = NULL;
1157         }
1158         return 0;
1159 }
1160
1161 #ifdef MODULE
1162 module_init(fbmem_init);
1163 static void __exit
1164 fbmem_exit(void)
1165 {
1166         class_destroy(fb_class);
1167 }
1168
1169 module_exit(fbmem_exit);
1170 MODULE_LICENSE("GPL");
1171 MODULE_DESCRIPTION("Framebuffer base");
1172 #else
1173 subsys_initcall(fbmem_init);
1174 #endif
1175
1176 int fb_new_modelist(struct fb_info *info)
1177 {
1178         struct fb_event event;
1179         struct fb_var_screeninfo var = info->var;
1180         struct list_head *pos, *n;
1181         struct fb_modelist *modelist;
1182         struct fb_videomode *m, mode;
1183         int err = 1;
1184
1185         list_for_each_safe(pos, n, &info->modelist) {
1186                 modelist = list_entry(pos, struct fb_modelist, list);
1187                 m = &modelist->mode;
1188                 fb_videomode_to_var(&var, m);
1189                 var.activate = FB_ACTIVATE_TEST;
1190                 err = fb_set_var(info, &var);
1191                 fb_var_to_videomode(&mode, &var);
1192                 if (err || !fb_mode_is_equal(m, &mode)) {
1193                         list_del(pos);
1194                         kfree(pos);
1195                 }
1196         }
1197
1198         err = 1;
1199
1200         if (!list_empty(&info->modelist)) {
1201                 event.info = info;
1202                 err = notifier_call_chain(&fb_notifier_list,
1203                                            FB_EVENT_NEW_MODELIST,
1204                                            &event);
1205         }
1206
1207         return err;
1208 }
1209
1210 static char *video_options[FB_MAX];
1211 static int ofonly;
1212
1213 extern const char *global_mode_option;
1214
1215 /**
1216  * fb_get_options - get kernel boot parameters
1217  * @name:   framebuffer name as it would appear in
1218  *          the boot parameter line
1219  *          (video=<name>:<options>)
1220  * @option: the option will be stored here
1221  *
1222  * NOTE: Needed to maintain backwards compatibility
1223  */
1224 int fb_get_options(char *name, char **option)
1225 {
1226         char *opt, *options = NULL;
1227         int opt_len, retval = 0;
1228         int name_len = strlen(name), i;
1229
1230         if (name_len && ofonly && strncmp(name, "offb", 4))
1231                 retval = 1;
1232
1233         if (name_len && !retval) {
1234                 for (i = 0; i < FB_MAX; i++) {
1235                         if (video_options[i] == NULL)
1236                                 continue;
1237                         opt_len = strlen(video_options[i]);
1238                         if (!opt_len)
1239                                 continue;
1240                         opt = video_options[i];
1241                         if (!strncmp(name, opt, name_len) &&
1242                             opt[name_len] == ':')
1243                                 options = opt + name_len + 1;
1244                 }
1245         }
1246         if (options && !strncmp(options, "off", 3))
1247                 retval = 1;
1248
1249         if (option)
1250                 *option = options;
1251
1252         return retval;
1253 }
1254
1255 /**
1256  *      video_setup - process command line options
1257  *      @options: string of options
1258  *
1259  *      Process command line options for frame buffer subsystem.
1260  *
1261  *      NOTE: This function is a __setup and __init function.
1262  *            It only stores the options.  Drivers have to call
1263  *            fb_get_options() as necessary.
1264  *
1265  *      Returns zero.
1266  *
1267  */
1268 static int __init video_setup(char *options)
1269 {
1270         int i, global = 0;
1271
1272         if (!options || !*options)
1273                 global = 1;
1274
1275         if (!global && !strncmp(options, "ofonly", 6)) {
1276                 ofonly = 1;
1277                 global = 1;
1278         }
1279
1280         if (!global && !strstr(options, "fb:")) {
1281                 global_mode_option = options;
1282                 global = 1;
1283         }
1284
1285         if (!global) {
1286                 for (i = 0; i < FB_MAX; i++) {
1287                         if (video_options[i] == NULL) {
1288                                 video_options[i] = options;
1289                                 break;
1290                         }
1291
1292                 }
1293         }
1294
1295         return 0;
1296 }
1297 __setup("video=", video_setup);
1298
1299     /*
1300      *  Visible symbols for modules
1301      */
1302
1303 EXPORT_SYMBOL(register_framebuffer);
1304 EXPORT_SYMBOL(unregister_framebuffer);
1305 EXPORT_SYMBOL(num_registered_fb);
1306 EXPORT_SYMBOL(registered_fb);
1307 EXPORT_SYMBOL(fb_prepare_logo);
1308 EXPORT_SYMBOL(fb_show_logo);
1309 EXPORT_SYMBOL(fb_set_var);
1310 EXPORT_SYMBOL(fb_blank);
1311 EXPORT_SYMBOL(fb_pan_display);
1312 EXPORT_SYMBOL(fb_get_buffer_offset);
1313 EXPORT_SYMBOL(fb_set_suspend);
1314 EXPORT_SYMBOL(fb_register_client);
1315 EXPORT_SYMBOL(fb_unregister_client);
1316 EXPORT_SYMBOL(fb_get_options);
1317 EXPORT_SYMBOL(fb_new_modelist);
1318
1319 MODULE_LICENSE("GPL");