[PATCH] 2.6.18: sb1250-mac: Broadcom PHY support
[linux-2.6] / drivers / video / fbmem.c
1 /*
2  *  linux/drivers/video/fbmem.c
3  *
4  *  Copyright (C) 1994 Martin Schaller
5  *
6  *      2001 - Documented with DocBook
7  *      - Brad Douglas <brad@neruo.com>
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive
11  * for more details.
12  */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/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/vt.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/err.h>
35 #include <linux/device.h>
36 #include <linux/efi.h>
37
38 #if defined(__mc68000__) || defined(CONFIG_APUS)
39 #include <asm/setup.h>
40 #endif
41
42 #include <asm/io.h>
43 #include <asm/uaccess.h>
44 #include <asm/page.h>
45 #include <asm/pgtable.h>
46
47 #include <linux/fb.h>
48
49     /*
50      *  Frame buffer device initialization and setup routines
51      */
52
53 #define FBPIXMAPSIZE    (1024 * 8)
54
55 struct fb_info *registered_fb[FB_MAX];
56 int num_registered_fb;
57
58 /*
59  * Helpers
60  */
61
62 int fb_get_color_depth(struct fb_var_screeninfo *var,
63                        struct fb_fix_screeninfo *fix)
64 {
65         int depth = 0;
66
67         if (fix->visual == FB_VISUAL_MONO01 ||
68             fix->visual == FB_VISUAL_MONO10)
69                 depth = 1;
70         else {
71                 if (var->green.length == var->blue.length &&
72                     var->green.length == var->red.length &&
73                     var->green.offset == var->blue.offset &&
74                     var->green.offset == var->red.offset)
75                         depth = var->green.length;
76                 else
77                         depth = var->green.length + var->red.length +
78                                 var->blue.length;
79         }
80
81         return depth;
82 }
83 EXPORT_SYMBOL(fb_get_color_depth);
84
85 /*
86  * Data padding functions.
87  */
88 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
89 {
90         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
91 }
92 EXPORT_SYMBOL(fb_pad_aligned_buffer);
93
94 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
95                                 u32 shift_high, u32 shift_low, u32 mod)
96 {
97         u8 mask = (u8) (0xfff << shift_high), tmp;
98         int i, j;
99
100         for (i = height; i--; ) {
101                 for (j = 0; j < idx; j++) {
102                         tmp = dst[j];
103                         tmp &= mask;
104                         tmp |= *src >> shift_low;
105                         dst[j] = tmp;
106                         tmp = *src << shift_high;
107                         dst[j+1] = tmp;
108                         src++;
109                 }
110                 tmp = dst[idx];
111                 tmp &= mask;
112                 tmp |= *src >> shift_low;
113                 dst[idx] = tmp;
114                 if (shift_high < mod) {
115                         tmp = *src << shift_high;
116                         dst[idx+1] = tmp;
117                 }
118                 src++;
119                 dst += d_pitch;
120         }
121 }
122 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
123
124 /*
125  * we need to lock this section since fb_cursor
126  * may use fb_imageblit()
127  */
128 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
129 {
130         u32 align = buf->buf_align - 1, offset;
131         char *addr = buf->addr;
132
133         /* If IO mapped, we need to sync before access, no sharing of
134          * the pixmap is done
135          */
136         if (buf->flags & FB_PIXMAP_IO) {
137                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
138                         info->fbops->fb_sync(info);
139                 return addr;
140         }
141
142         /* See if we fit in the remaining pixmap space */
143         offset = buf->offset + align;
144         offset &= ~align;
145         if (offset + size > buf->size) {
146                 /* We do not fit. In order to be able to re-use the buffer,
147                  * we must ensure no asynchronous DMA'ing or whatever operation
148                  * is in progress, we sync for that.
149                  */
150                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
151                         info->fbops->fb_sync(info);
152                 offset = 0;
153         }
154         buf->offset = offset + size;
155         addr += offset;
156
157         return addr;
158 }
159
160 #ifdef CONFIG_LOGO
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;
251         const u8 *src = logo->data;
252         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
253         u8 fg = 1, d;
254
255         if (fb_get_color_depth(&info->var, &info->fix) == 3)
256                 fg = 7;
257
258         if (info->fix.visual == FB_VISUAL_MONO01 ||
259             info->fix.visual == FB_VISUAL_MONO10)
260                 fg = ~((u8) (0xfff << info->var.green.length));
261
262         switch (depth) {
263         case 4:
264                 for (i = 0; i < logo->height; i++)
265                         for (j = 0; j < logo->width; src++) {
266                                 *dst++ = *src >> 4;
267                                 j++;
268                                 if (j < logo->width) {
269                                         *dst++ = *src & 0x0f;
270                                         j++;
271                                 }
272                         }
273                 break;
274         case 1:
275                 for (i = 0; i < logo->height; i++) {
276                         for (j = 0; j < logo->width; src++) {
277                                 d = *src ^ xor;
278                                 for (k = 7; k >= 0; k--) {
279                                         *dst++ = ((d >> k) & 1) ? fg : 0;
280                                         j++;
281                                 }
282                         }
283                 }
284                 break;
285         }
286 }
287
288 /*
289  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
290  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
291  * the visual format and color depth of the framebuffer, the DAC, the
292  * pseudo_palette, and the logo data will be adjusted accordingly.
293  *
294  * Case 1 - linux_logo_clut224:
295  * Color exceeds the number of console colors (16), thus we set the hardware DAC
296  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
297  *
298  * For visuals that require color info from the pseudo_palette, we also construct
299  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
300  * will be set.
301  *
302  * Case 2 - linux_logo_vga16:
303  * The number of colors just matches the console colors, thus there is no need
304  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
305  * each byte contains color information for two pixels (upper and lower nibble).
306  * To be consistent with fb_imageblit() usage, we therefore separate the two
307  * nibbles into separate bytes. The "depth" flag will be set to 4.
308  *
309  * Case 3 - linux_logo_mono:
310  * This is similar with Case 2.  Each byte contains information for 8 pixels.
311  * We isolate each bit and expand each into a byte. The "depth" flag will
312  * be set to 1.
313  */
314 static struct logo_data {
315         int depth;
316         int needs_directpalette;
317         int needs_truepalette;
318         int needs_cmapreset;
319         const struct linux_logo *logo;
320 } fb_logo;
321
322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
323 {
324         u32 size = width * height, i;
325
326         out += size - 1;
327
328         for (i = size; i--; )
329                 *out-- = *in++;
330 }
331
332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334         int i, j, h = height - 1;
335
336         for (i = 0; i < height; i++)
337                 for (j = 0; j < width; j++)
338                                 out[height * j + h - i] = *in++;
339 }
340
341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
342 {
343         int i, j, w = width - 1;
344
345         for (i = 0; i < height; i++)
346                 for (j = 0; j < width; j++)
347                         out[height * (w - j) + i] = *in++;
348 }
349
350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
351                            struct fb_image *image, int rotate)
352 {
353         u32 tmp;
354
355         if (rotate == FB_ROTATE_UD) {
356                 fb_rotate_logo_ud(image->data, dst, image->width,
357                                   image->height);
358                 image->dx = info->var.xres - image->width;
359                 image->dy = info->var.yres - image->height;
360         } else if (rotate == FB_ROTATE_CW) {
361                 fb_rotate_logo_cw(image->data, dst, image->width,
362                                   image->height);
363                 tmp = image->width;
364                 image->width = image->height;
365                 image->height = tmp;
366                 image->dx = info->var.xres - image->width;
367         } else if (rotate == FB_ROTATE_CCW) {
368                 fb_rotate_logo_ccw(image->data, dst, image->width,
369                                    image->height);
370                 tmp = image->width;
371                 image->width = image->height;
372                 image->height = tmp;
373                 image->dy = info->var.yres - image->height;
374         }
375
376         image->data = dst;
377 }
378
379 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
380                             int rotate)
381 {
382         int x;
383
384         if (rotate == FB_ROTATE_UR) {
385                 for (x = 0; x < num_online_cpus() &&
386                              x * (fb_logo.logo->width + 8) <=
387                              info->var.xres - fb_logo.logo->width; x++) {
388                         info->fbops->fb_imageblit(info, image);
389                         image->dx += fb_logo.logo->width + 8;
390                 }
391         } else if (rotate == FB_ROTATE_UD) {
392                 for (x = 0; x < num_online_cpus() &&
393                              x * (fb_logo.logo->width + 8) <=
394                              info->var.xres - fb_logo.logo->width; x++) {
395                         info->fbops->fb_imageblit(info, image);
396                         image->dx -= fb_logo.logo->width + 8;
397                 }
398         } else if (rotate == FB_ROTATE_CW) {
399                 for (x = 0; x < num_online_cpus() &&
400                              x * (fb_logo.logo->width + 8) <=
401                              info->var.yres - fb_logo.logo->width; x++) {
402                         info->fbops->fb_imageblit(info, image);
403                         image->dy += fb_logo.logo->width + 8;
404                 }
405         } else if (rotate == FB_ROTATE_CCW) {
406                 for (x = 0; x < num_online_cpus() &&
407                              x * (fb_logo.logo->width + 8) <=
408                              info->var.yres - fb_logo.logo->width; x++) {
409                         info->fbops->fb_imageblit(info, image);
410                         image->dy -= fb_logo.logo->width + 8;
411                 }
412         }
413 }
414
415 int fb_prepare_logo(struct fb_info *info, int rotate)
416 {
417         int depth = fb_get_color_depth(&info->var, &info->fix);
418         int yres;
419
420         memset(&fb_logo, 0, sizeof(struct logo_data));
421
422         if (info->flags & FBINFO_MISC_TILEBLITTING)
423                 return 0;
424
425         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
426                 depth = info->var.blue.length;
427                 if (info->var.red.length < depth)
428                         depth = info->var.red.length;
429                 if (info->var.green.length < depth)
430                         depth = info->var.green.length;
431         }
432
433         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
434                 /* assume console colormap */
435                 depth = 4;
436         }
437
438         if (depth >= 8) {
439                 switch (info->fix.visual) {
440                 case FB_VISUAL_TRUECOLOR:
441                         fb_logo.needs_truepalette = 1;
442                         break;
443                 case FB_VISUAL_DIRECTCOLOR:
444                         fb_logo.needs_directpalette = 1;
445                         fb_logo.needs_cmapreset = 1;
446                         break;
447                 case FB_VISUAL_PSEUDOCOLOR:
448                         fb_logo.needs_cmapreset = 1;
449                         break;
450                 }
451         }
452
453         /* Return if no suitable logo was found */
454         fb_logo.logo = fb_find_logo(depth);
455
456         if (!fb_logo.logo) {
457                 return 0;
458         }
459         
460         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
461                 yres = info->var.yres;
462         else
463                 yres = info->var.xres;
464
465         if (fb_logo.logo->height > yres) {
466                 fb_logo.logo = NULL;
467                 return 0;
468         }
469
470         /* What depth we asked for might be different from what we get */
471         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
472                 fb_logo.depth = 8;
473         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
474                 fb_logo.depth = 4;
475         else
476                 fb_logo.depth = 1;              
477         return fb_logo.logo->height;
478 }
479
480 int fb_show_logo(struct fb_info *info, int rotate)
481 {
482         u32 *palette = NULL, *saved_pseudo_palette = NULL;
483         unsigned char *logo_new = NULL, *logo_rotate = NULL;
484         struct fb_image image;
485
486         /* Return if the frame buffer is not mapped or suspended */
487         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
488                 return 0;
489
490         image.depth = 8;
491         image.data = fb_logo.logo->data;
492
493         if (fb_logo.needs_cmapreset)
494                 fb_set_logocmap(info, fb_logo.logo);
495
496         if (fb_logo.needs_truepalette || 
497             fb_logo.needs_directpalette) {
498                 palette = kmalloc(256 * 4, GFP_KERNEL);
499                 if (palette == NULL)
500                         return 0;
501
502                 if (fb_logo.needs_truepalette)
503                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
504                 else
505                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
506
507                 saved_pseudo_palette = info->pseudo_palette;
508                 info->pseudo_palette = palette;
509         }
510
511         if (fb_logo.depth <= 4) {
512                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height, 
513                                    GFP_KERNEL);
514                 if (logo_new == NULL) {
515                         kfree(palette);
516                         if (saved_pseudo_palette)
517                                 info->pseudo_palette = saved_pseudo_palette;
518                         return 0;
519                 }
520                 image.data = logo_new;
521                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
522         }
523
524         image.dx = 0;
525         image.dy = 0;
526         image.width = fb_logo.logo->width;
527         image.height = fb_logo.logo->height;
528
529         if (rotate) {
530                 logo_rotate = kmalloc(fb_logo.logo->width *
531                                       fb_logo.logo->height, GFP_KERNEL);
532                 if (logo_rotate)
533                         fb_rotate_logo(info, logo_rotate, &image, rotate);
534         }
535
536         fb_do_show_logo(info, &image, rotate);
537
538         kfree(palette);
539         if (saved_pseudo_palette != NULL)
540                 info->pseudo_palette = saved_pseudo_palette;
541         kfree(logo_new);
542         kfree(logo_rotate);
543         return fb_logo.logo->height;
544 }
545 #else
546 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
547 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
548 #endif /* CONFIG_LOGO */
549
550 static int fbmem_read_proc(char *buf, char **start, off_t offset,
551                            int len, int *eof, void *private)
552 {
553         struct fb_info **fi;
554         int clen;
555
556         clen = 0;
557         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
558              fi++)
559                 if (*fi)
560                         clen += sprintf(buf + clen, "%d %s\n",
561                                         (*fi)->node,
562                                         (*fi)->fix.id);
563         *start = buf + offset;
564         if (clen > offset)
565                 clen -= offset;
566         else
567                 clen = 0;
568         return clen < len ? clen : len;
569 }
570
571 static ssize_t
572 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
573 {
574         unsigned long p = *ppos;
575         struct inode *inode = file->f_dentry->d_inode;
576         int fbidx = iminor(inode);
577         struct fb_info *info = registered_fb[fbidx];
578         u32 *buffer, *dst;
579         u32 __iomem *src;
580         int c, i, cnt = 0, err = 0;
581         unsigned long total_size;
582
583         if (!info || ! info->screen_base)
584                 return -ENODEV;
585
586         if (info->state != FBINFO_STATE_RUNNING)
587                 return -EPERM;
588
589         if (info->fbops->fb_read)
590                 return info->fbops->fb_read(file, buf, count, ppos);
591         
592         total_size = info->screen_size;
593
594         if (total_size == 0)
595                 total_size = info->fix.smem_len;
596
597         if (p >= total_size)
598                 return 0;
599
600         if (count >= total_size)
601                 count = total_size;
602
603         if (count + p > total_size)
604                 count = total_size - p;
605
606         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
607                          GFP_KERNEL);
608         if (!buffer)
609                 return -ENOMEM;
610
611         src = (u32 __iomem *) (info->screen_base + p);
612
613         if (info->fbops->fb_sync)
614                 info->fbops->fb_sync(info);
615
616         while (count) {
617                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
618                 dst = buffer;
619                 for (i = c >> 2; i--; )
620                         *dst++ = fb_readl(src++);
621                 if (c & 3) {
622                         u8 *dst8 = (u8 *) dst;
623                         u8 __iomem *src8 = (u8 __iomem *) src;
624
625                         for (i = c & 3; i--;)
626                                 *dst8++ = fb_readb(src8++);
627
628                         src = (u32 __iomem *) src8;
629                 }
630
631                 if (copy_to_user(buf, buffer, c)) {
632                         err = -EFAULT;
633                         break;
634                 }
635                 *ppos += c;
636                 buf += c;
637                 cnt += c;
638                 count -= c;
639         }
640
641         kfree(buffer);
642
643         return (err) ? err : cnt;
644 }
645
646 static ssize_t
647 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
648 {
649         unsigned long p = *ppos;
650         struct inode *inode = file->f_dentry->d_inode;
651         int fbidx = iminor(inode);
652         struct fb_info *info = registered_fb[fbidx];
653         u32 *buffer, *src;
654         u32 __iomem *dst;
655         int c, i, cnt = 0, err = 0;
656         unsigned long total_size;
657
658         if (!info || !info->screen_base)
659                 return -ENODEV;
660
661         if (info->state != FBINFO_STATE_RUNNING)
662                 return -EPERM;
663
664         if (info->fbops->fb_write)
665                 return info->fbops->fb_write(file, buf, count, ppos);
666         
667         total_size = info->screen_size;
668
669         if (total_size == 0)
670                 total_size = info->fix.smem_len;
671
672         if (p > total_size)
673                 return -EFBIG;
674
675         if (count > total_size) {
676                 err = -EFBIG;
677                 count = total_size;
678         }
679
680         if (count + p > total_size) {
681                 if (!err)
682                         err = -ENOSPC;
683
684                 count = total_size - p;
685         }
686
687         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
688                          GFP_KERNEL);
689         if (!buffer)
690                 return -ENOMEM;
691
692         dst = (u32 __iomem *) (info->screen_base + p);
693
694         if (info->fbops->fb_sync)
695                 info->fbops->fb_sync(info);
696
697         while (count) {
698                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
699                 src = buffer;
700
701                 if (copy_from_user(src, buf, c)) {
702                         err = -EFAULT;
703                         break;
704                 }
705
706                 for (i = c >> 2; i--; )
707                         fb_writel(*src++, dst++);
708
709                 if (c & 3) {
710                         u8 *src8 = (u8 *) src;
711                         u8 __iomem *dst8 = (u8 __iomem *) dst;
712
713                         for (i = c & 3; i--; )
714                                 fb_writeb(*src8++, dst8++);
715
716                         dst = (u32 __iomem *) dst8;
717                 }
718
719                 *ppos += c;
720                 buf += c;
721                 cnt += c;
722                 count -= c;
723         }
724
725         kfree(buffer);
726
727         return (cnt) ? cnt : err;
728 }
729
730 #ifdef CONFIG_KMOD
731 static void try_to_load(int fb)
732 {
733         request_module("fb%d", fb);
734 }
735 #endif /* CONFIG_KMOD */
736
737 int
738 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
739 {
740         struct fb_fix_screeninfo *fix = &info->fix;
741         int xoffset = var->xoffset;
742         int yoffset = var->yoffset;
743         int err = 0, yres = info->var.yres;
744
745         if (var->yoffset > 0) {
746                 if (var->vmode & FB_VMODE_YWRAP) {
747                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
748                                 err = -EINVAL;
749                         else
750                                 yres = 0;
751                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
752                         err = -EINVAL;
753         }
754
755         if (var->xoffset > 0 && (!fix->xpanstep ||
756                                  (var->xoffset % fix->xpanstep)))
757                 err = -EINVAL;
758
759         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
760             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
761             var->xoffset + info->var.xres > info->var.xres_virtual)
762                 return -EINVAL;
763
764         if ((err = info->fbops->fb_pan_display(var, info)))
765                 return err;
766         info->var.xoffset = var->xoffset;
767         info->var.yoffset = var->yoffset;
768         if (var->vmode & FB_VMODE_YWRAP)
769                 info->var.vmode |= FB_VMODE_YWRAP;
770         else
771                 info->var.vmode &= ~FB_VMODE_YWRAP;
772         return 0;
773 }
774
775 int
776 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
777 {
778         int err, flags = info->flags;
779
780         if (var->activate & FB_ACTIVATE_INV_MODE) {
781                 struct fb_videomode mode1, mode2;
782                 int ret = 0;
783
784                 fb_var_to_videomode(&mode1, var);
785                 fb_var_to_videomode(&mode2, &info->var);
786                 /* make sure we don't delete the videomode of current var */
787                 ret = fb_mode_is_equal(&mode1, &mode2);
788
789                 if (!ret) {
790                     struct fb_event event;
791
792                     event.info = info;
793                     event.data = &mode1;
794                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
795                 }
796
797                 if (!ret)
798                     fb_delete_videomode(&mode1, &info->modelist);
799
800                 return ret;
801         }
802
803         if ((var->activate & FB_ACTIVATE_FORCE) ||
804             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
805                 if (!info->fbops->fb_check_var) {
806                         *var = info->var;
807                         return 0;
808                 }
809
810                 if ((err = info->fbops->fb_check_var(var, info)))
811                         return err;
812
813                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
814                         struct fb_videomode mode;
815                         int err = 0;
816
817                         info->var = *var;
818                         if (info->fbops->fb_set_par)
819                                 info->fbops->fb_set_par(info);
820
821                         fb_pan_display(info, &info->var);
822
823                         fb_set_cmap(&info->cmap, info);
824
825                         fb_var_to_videomode(&mode, &info->var);
826
827                         if (info->modelist.prev && info->modelist.next &&
828                             !list_empty(&info->modelist))
829                                 err = fb_add_videomode(&mode, &info->modelist);
830
831                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
832                                 struct fb_event event;
833                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
834                                         FB_EVENT_MODE_CHANGE_ALL :
835                                         FB_EVENT_MODE_CHANGE;
836
837                                 info->flags &= ~FBINFO_MISC_USEREVENT;
838                                 event.info = info;
839                                 fb_notifier_call_chain(evnt, &event);
840                         }
841                 }
842         }
843         return 0;
844 }
845
846 int
847 fb_blank(struct fb_info *info, int blank)
848 {       
849         int ret = -EINVAL;
850
851         if (blank > FB_BLANK_POWERDOWN)
852                 blank = FB_BLANK_POWERDOWN;
853
854         if (info->fbops->fb_blank)
855                 ret = info->fbops->fb_blank(blank, info);
856
857         if (!ret) {
858                 struct fb_event event;
859
860                 event.info = info;
861                 event.data = &blank;
862                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
863         }
864
865         return ret;
866 }
867
868 static int 
869 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
870          unsigned long arg)
871 {
872         int fbidx = iminor(inode);
873         struct fb_info *info = registered_fb[fbidx];
874         struct fb_ops *fb = info->fbops;
875         struct fb_var_screeninfo var;
876         struct fb_fix_screeninfo fix;
877         struct fb_con2fbmap con2fb;
878         struct fb_cmap_user cmap;
879         struct fb_event event;
880         void __user *argp = (void __user *)arg;
881         int i;
882         
883         if (!fb)
884                 return -ENODEV;
885         switch (cmd) {
886         case FBIOGET_VSCREENINFO:
887                 return copy_to_user(argp, &info->var,
888                                     sizeof(var)) ? -EFAULT : 0;
889         case FBIOPUT_VSCREENINFO:
890                 if (copy_from_user(&var, argp, sizeof(var)))
891                         return -EFAULT;
892                 acquire_console_sem();
893                 info->flags |= FBINFO_MISC_USEREVENT;
894                 i = fb_set_var(info, &var);
895                 info->flags &= ~FBINFO_MISC_USEREVENT;
896                 release_console_sem();
897                 if (i) return i;
898                 if (copy_to_user(argp, &var, sizeof(var)))
899                         return -EFAULT;
900                 return 0;
901         case FBIOGET_FSCREENINFO:
902                 return copy_to_user(argp, &info->fix,
903                                     sizeof(fix)) ? -EFAULT : 0;
904         case FBIOPUTCMAP:
905                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
906                         return -EFAULT;
907                 return (fb_set_user_cmap(&cmap, info));
908         case FBIOGETCMAP:
909                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
910                         return -EFAULT;
911                 return fb_cmap_to_user(&info->cmap, &cmap);
912         case FBIOPAN_DISPLAY:
913                 if (copy_from_user(&var, argp, sizeof(var)))
914                         return -EFAULT;
915                 acquire_console_sem();
916                 i = fb_pan_display(info, &var);
917                 release_console_sem();
918                 if (i)
919                         return i;
920                 if (copy_to_user(argp, &var, sizeof(var)))
921                         return -EFAULT;
922                 return 0;
923         case FBIO_CURSOR:
924                 return -EINVAL;
925         case FBIOGET_CON2FBMAP:
926                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
927                         return -EFAULT;
928                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
929                     return -EINVAL;
930                 con2fb.framebuffer = -1;
931                 event.info = info;
932                 event.data = &con2fb;
933                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
934                 return copy_to_user(argp, &con2fb,
935                                     sizeof(con2fb)) ? -EFAULT : 0;
936         case FBIOPUT_CON2FBMAP:
937                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
938                         return - EFAULT;
939                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
940                     return -EINVAL;
941                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
942                     return -EINVAL;
943 #ifdef CONFIG_KMOD
944                 if (!registered_fb[con2fb.framebuffer])
945                     try_to_load(con2fb.framebuffer);
946 #endif /* CONFIG_KMOD */
947                 if (!registered_fb[con2fb.framebuffer])
948                     return -EINVAL;
949                 event.info = info;
950                 event.data = &con2fb;
951                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
952                                               &event);
953         case FBIOBLANK:
954                 acquire_console_sem();
955                 info->flags |= FBINFO_MISC_USEREVENT;
956                 i = fb_blank(info, arg);
957                 info->flags &= ~FBINFO_MISC_USEREVENT;
958                 release_console_sem();
959                 return i;
960         default:
961                 if (fb->fb_ioctl == NULL)
962                         return -EINVAL;
963                 return fb->fb_ioctl(info, cmd, arg);
964         }
965 }
966
967 #ifdef CONFIG_COMPAT
968 struct fb_fix_screeninfo32 {
969         char                    id[16];
970         compat_caddr_t          smem_start;
971         u32                     smem_len;
972         u32                     type;
973         u32                     type_aux;
974         u32                     visual;
975         u16                     xpanstep;
976         u16                     ypanstep;
977         u16                     ywrapstep;
978         u32                     line_length;
979         compat_caddr_t          mmio_start;
980         u32                     mmio_len;
981         u32                     accel;
982         u16                     reserved[3];
983 };
984
985 struct fb_cmap32 {
986         u32                     start;
987         u32                     len;
988         compat_caddr_t  red;
989         compat_caddr_t  green;
990         compat_caddr_t  blue;
991         compat_caddr_t  transp;
992 };
993
994 static int fb_getput_cmap(struct inode *inode, struct file *file,
995                         unsigned int cmd, unsigned long arg)
996 {
997         struct fb_cmap_user __user *cmap;
998         struct fb_cmap32 __user *cmap32;
999         __u32 data;
1000         int err;
1001
1002         cmap = compat_alloc_user_space(sizeof(*cmap));
1003         cmap32 = compat_ptr(arg);
1004
1005         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1006                 return -EFAULT;
1007
1008         if (get_user(data, &cmap32->red) ||
1009             put_user(compat_ptr(data), &cmap->red) ||
1010             get_user(data, &cmap32->green) ||
1011             put_user(compat_ptr(data), &cmap->green) ||
1012             get_user(data, &cmap32->blue) ||
1013             put_user(compat_ptr(data), &cmap->blue) ||
1014             get_user(data, &cmap32->transp) ||
1015             put_user(compat_ptr(data), &cmap->transp))
1016                 return -EFAULT;
1017
1018         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1019
1020         if (!err) {
1021                 if (copy_in_user(&cmap32->start,
1022                                  &cmap->start,
1023                                  2 * sizeof(__u32)))
1024                         err = -EFAULT;
1025         }
1026         return err;
1027 }
1028
1029 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1030                                   struct fb_fix_screeninfo32 __user *fix32)
1031 {
1032         __u32 data;
1033         int err;
1034
1035         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1036
1037         data = (__u32) (unsigned long) fix->smem_start;
1038         err |= put_user(data, &fix32->smem_start);
1039
1040         err |= put_user(fix->smem_len, &fix32->smem_len);
1041         err |= put_user(fix->type, &fix32->type);
1042         err |= put_user(fix->type_aux, &fix32->type_aux);
1043         err |= put_user(fix->visual, &fix32->visual);
1044         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1045         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1046         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1047         err |= put_user(fix->line_length, &fix32->line_length);
1048
1049         data = (__u32) (unsigned long) fix->mmio_start;
1050         err |= put_user(data, &fix32->mmio_start);
1051
1052         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1053         err |= put_user(fix->accel, &fix32->accel);
1054         err |= copy_to_user(fix32->reserved, fix->reserved,
1055                             sizeof(fix->reserved));
1056
1057         return err;
1058 }
1059
1060 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1061                                 unsigned int cmd, unsigned long arg)
1062 {
1063         mm_segment_t old_fs;
1064         struct fb_fix_screeninfo fix;
1065         struct fb_fix_screeninfo32 __user *fix32;
1066         int err;
1067
1068         fix32 = compat_ptr(arg);
1069
1070         old_fs = get_fs();
1071         set_fs(KERNEL_DS);
1072         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1073         set_fs(old_fs);
1074
1075         if (!err)
1076                 err = do_fscreeninfo_to_user(&fix, fix32);
1077
1078         return err;
1079 }
1080
1081 static long
1082 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1083 {
1084         struct inode *inode = file->f_dentry->d_inode;
1085         int fbidx = iminor(inode);
1086         struct fb_info *info = registered_fb[fbidx];
1087         struct fb_ops *fb = info->fbops;
1088         long ret = -ENOIOCTLCMD;
1089
1090         lock_kernel();
1091         switch(cmd) {
1092         case FBIOGET_VSCREENINFO:
1093         case FBIOPUT_VSCREENINFO:
1094         case FBIOPAN_DISPLAY:
1095         case FBIOGET_CON2FBMAP:
1096         case FBIOPUT_CON2FBMAP:
1097                 arg = (unsigned long) compat_ptr(arg);
1098         case FBIOBLANK:
1099                 ret = fb_ioctl(inode, file, cmd, arg);
1100                 break;
1101
1102         case FBIOGET_FSCREENINFO:
1103                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1104                 break;
1105
1106         case FBIOGETCMAP:
1107         case FBIOPUTCMAP:
1108                 ret = fb_getput_cmap(inode, file, cmd, arg);
1109                 break;
1110
1111         default:
1112                 if (fb->fb_compat_ioctl)
1113                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1114                 break;
1115         }
1116         unlock_kernel();
1117         return ret;
1118 }
1119 #endif
1120
1121 static int 
1122 fb_mmap(struct file *file, struct vm_area_struct * vma)
1123 {
1124         int fbidx = iminor(file->f_dentry->d_inode);
1125         struct fb_info *info = registered_fb[fbidx];
1126         struct fb_ops *fb = info->fbops;
1127         unsigned long off;
1128 #if !defined(__sparc__) || defined(__sparc_v9__)
1129         unsigned long start;
1130         u32 len;
1131 #endif
1132
1133         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1134                 return -EINVAL;
1135         off = vma->vm_pgoff << PAGE_SHIFT;
1136         if (!fb)
1137                 return -ENODEV;
1138         if (fb->fb_mmap) {
1139                 int res;
1140                 lock_kernel();
1141                 res = fb->fb_mmap(info, vma);
1142                 unlock_kernel();
1143                 return res;
1144         }
1145
1146 #if defined(__sparc__) && !defined(__sparc_v9__)
1147         /* Should never get here, all fb drivers should have their own
1148            mmap routines */
1149         return -EINVAL;
1150 #else
1151         /* !sparc32... */
1152         lock_kernel();
1153
1154         /* frame buffer memory */
1155         start = info->fix.smem_start;
1156         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1157         if (off >= len) {
1158                 /* memory mapped io */
1159                 off -= len;
1160                 if (info->var.accel_flags) {
1161                         unlock_kernel();
1162                         return -EINVAL;
1163                 }
1164                 start = info->fix.mmio_start;
1165                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1166         }
1167         unlock_kernel();
1168         start &= PAGE_MASK;
1169         if ((vma->vm_end - vma->vm_start + off) > len)
1170                 return -EINVAL;
1171         off += start;
1172         vma->vm_pgoff = off >> PAGE_SHIFT;
1173         /* This is an IO map - tell maydump to skip this VMA */
1174         vma->vm_flags |= VM_IO | VM_RESERVED;
1175 #if defined(__mc68000__)
1176 #if defined(CONFIG_SUN3)
1177         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1178 #elif defined(CONFIG_MMU)
1179         if (CPU_IS_020_OR_030)
1180                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1181         if (CPU_IS_040_OR_060) {
1182                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1183                 /* Use no-cache mode, serialized */
1184                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1185         }
1186 #endif
1187 #elif defined(__powerpc__)
1188         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1189                                                  vma->vm_end - vma->vm_start,
1190                                                  vma->vm_page_prot);
1191 #elif defined(__alpha__)
1192         /* Caching is off in the I/O space quadrant by design.  */
1193 #elif defined(__i386__) || defined(__x86_64__)
1194         if (boot_cpu_data.x86 > 3)
1195                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1196 #elif defined(__mips__) || defined(__sparc_v9__)
1197         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1198 #elif defined(__hppa__)
1199         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1200 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1201         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1202 #elif defined(__ia64__)
1203         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1204                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1205         else
1206                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1207 #else
1208 #warning What do we have to do here??
1209 #endif
1210         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1211                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1212                 return -EAGAIN;
1213         return 0;
1214 #endif /* !sparc32 */
1215 }
1216
1217 static int
1218 fb_open(struct inode *inode, struct file *file)
1219 {
1220         int fbidx = iminor(inode);
1221         struct fb_info *info;
1222         int res = 0;
1223
1224         if (fbidx >= FB_MAX)
1225                 return -ENODEV;
1226 #ifdef CONFIG_KMOD
1227         if (!(info = registered_fb[fbidx]))
1228                 try_to_load(fbidx);
1229 #endif /* CONFIG_KMOD */
1230         if (!(info = registered_fb[fbidx]))
1231                 return -ENODEV;
1232         if (!try_module_get(info->fbops->owner))
1233                 return -ENODEV;
1234         file->private_data = info;
1235         if (info->fbops->fb_open) {
1236                 res = info->fbops->fb_open(info,1);
1237                 if (res)
1238                         module_put(info->fbops->owner);
1239         }
1240         return res;
1241 }
1242
1243 static int 
1244 fb_release(struct inode *inode, struct file *file)
1245 {
1246         struct fb_info * const info = file->private_data;
1247
1248         lock_kernel();
1249         if (info->fbops->fb_release)
1250                 info->fbops->fb_release(info,1);
1251         module_put(info->fbops->owner);
1252         unlock_kernel();
1253         return 0;
1254 }
1255
1256 static struct file_operations fb_fops = {
1257         .owner =        THIS_MODULE,
1258         .read =         fb_read,
1259         .write =        fb_write,
1260         .ioctl =        fb_ioctl,
1261 #ifdef CONFIG_COMPAT
1262         .compat_ioctl = fb_compat_ioctl,
1263 #endif
1264         .mmap =         fb_mmap,
1265         .open =         fb_open,
1266         .release =      fb_release,
1267 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1268         .get_unmapped_area = get_fb_unmapped_area,
1269 #endif
1270 };
1271
1272 struct class *fb_class;
1273 EXPORT_SYMBOL(fb_class);
1274 /**
1275  *      register_framebuffer - registers a frame buffer device
1276  *      @fb_info: frame buffer info structure
1277  *
1278  *      Registers a frame buffer device @fb_info.
1279  *
1280  *      Returns negative errno on error, or zero for success.
1281  *
1282  */
1283
1284 int
1285 register_framebuffer(struct fb_info *fb_info)
1286 {
1287         int i;
1288         struct fb_event event;
1289         struct fb_videomode mode;
1290
1291         if (num_registered_fb == FB_MAX)
1292                 return -ENXIO;
1293         num_registered_fb++;
1294         for (i = 0 ; i < FB_MAX; i++)
1295                 if (!registered_fb[i])
1296                         break;
1297         fb_info->node = i;
1298
1299         fb_info->dev = device_create(fb_class, fb_info->device,
1300                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1301         if (IS_ERR(fb_info->dev)) {
1302                 /* Not fatal */
1303                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1304                 fb_info->dev = NULL;
1305         } else
1306                 fb_init_device(fb_info);
1307
1308         if (fb_info->pixmap.addr == NULL) {
1309                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1310                 if (fb_info->pixmap.addr) {
1311                         fb_info->pixmap.size = FBPIXMAPSIZE;
1312                         fb_info->pixmap.buf_align = 1;
1313                         fb_info->pixmap.scan_align = 1;
1314                         fb_info->pixmap.access_align = 32;
1315                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1316                 }
1317         }       
1318         fb_info->pixmap.offset = 0;
1319
1320         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1321                 INIT_LIST_HEAD(&fb_info->modelist);
1322
1323         fb_var_to_videomode(&mode, &fb_info->var);
1324         fb_add_videomode(&mode, &fb_info->modelist);
1325         registered_fb[i] = fb_info;
1326
1327         event.info = fb_info;
1328         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1329         return 0;
1330 }
1331
1332
1333 /**
1334  *      unregister_framebuffer - releases a frame buffer device
1335  *      @fb_info: frame buffer info structure
1336  *
1337  *      Unregisters a frame buffer device @fb_info.
1338  *
1339  *      Returns negative errno on error, or zero for success.
1340  *
1341  */
1342
1343 int
1344 unregister_framebuffer(struct fb_info *fb_info)
1345 {
1346         struct fb_event event;
1347         int i;
1348
1349         i = fb_info->node;
1350         if (!registered_fb[i])
1351                 return -EINVAL;
1352
1353         if (fb_info->pixmap.addr &&
1354             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1355                 kfree(fb_info->pixmap.addr);
1356         fb_destroy_modelist(&fb_info->modelist);
1357         registered_fb[i]=NULL;
1358         num_registered_fb--;
1359         fb_cleanup_device(fb_info);
1360         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1361         event.info = fb_info;
1362         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1363         return 0;
1364 }
1365
1366 /**
1367  *      fb_set_suspend - low level driver signals suspend
1368  *      @info: framebuffer affected
1369  *      @state: 0 = resuming, !=0 = suspending
1370  *
1371  *      This is meant to be used by low level drivers to
1372  *      signal suspend/resume to the core & clients.
1373  *      It must be called with the console semaphore held
1374  */
1375 void fb_set_suspend(struct fb_info *info, int state)
1376 {
1377         struct fb_event event;
1378
1379         event.info = info;
1380         if (state) {
1381                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1382                 info->state = FBINFO_STATE_SUSPENDED;
1383         } else {
1384                 info->state = FBINFO_STATE_RUNNING;
1385                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1386         }
1387 }
1388
1389 /**
1390  *      fbmem_init - init frame buffer subsystem
1391  *
1392  *      Initialize the frame buffer subsystem.
1393  *
1394  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1395  *
1396  */
1397
1398 static int __init
1399 fbmem_init(void)
1400 {
1401         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1402
1403         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1404                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1405
1406         fb_class = class_create(THIS_MODULE, "graphics");
1407         if (IS_ERR(fb_class)) {
1408                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1409                 fb_class = NULL;
1410         }
1411         return 0;
1412 }
1413
1414 #ifdef MODULE
1415 module_init(fbmem_init);
1416 static void __exit
1417 fbmem_exit(void)
1418 {
1419         class_destroy(fb_class);
1420         unregister_chrdev(FB_MAJOR, "fb");
1421 }
1422
1423 module_exit(fbmem_exit);
1424 MODULE_LICENSE("GPL");
1425 MODULE_DESCRIPTION("Framebuffer base");
1426 #else
1427 subsys_initcall(fbmem_init);
1428 #endif
1429
1430 int fb_new_modelist(struct fb_info *info)
1431 {
1432         struct fb_event event;
1433         struct fb_var_screeninfo var = info->var;
1434         struct list_head *pos, *n;
1435         struct fb_modelist *modelist;
1436         struct fb_videomode *m, mode;
1437         int err = 1;
1438
1439         list_for_each_safe(pos, n, &info->modelist) {
1440                 modelist = list_entry(pos, struct fb_modelist, list);
1441                 m = &modelist->mode;
1442                 fb_videomode_to_var(&var, m);
1443                 var.activate = FB_ACTIVATE_TEST;
1444                 err = fb_set_var(info, &var);
1445                 fb_var_to_videomode(&mode, &var);
1446                 if (err || !fb_mode_is_equal(m, &mode)) {
1447                         list_del(pos);
1448                         kfree(pos);
1449                 }
1450         }
1451
1452         err = 1;
1453
1454         if (!list_empty(&info->modelist)) {
1455                 event.info = info;
1456                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1457         }
1458
1459         return err;
1460 }
1461
1462 static char *video_options[FB_MAX];
1463 static int ofonly;
1464
1465 extern const char *global_mode_option;
1466
1467 /**
1468  * fb_get_options - get kernel boot parameters
1469  * @name:   framebuffer name as it would appear in
1470  *          the boot parameter line
1471  *          (video=<name>:<options>)
1472  * @option: the option will be stored here
1473  *
1474  * NOTE: Needed to maintain backwards compatibility
1475  */
1476 int fb_get_options(char *name, char **option)
1477 {
1478         char *opt, *options = NULL;
1479         int opt_len, retval = 0;
1480         int name_len = strlen(name), i;
1481
1482         if (name_len && ofonly && strncmp(name, "offb", 4))
1483                 retval = 1;
1484
1485         if (name_len && !retval) {
1486                 for (i = 0; i < FB_MAX; i++) {
1487                         if (video_options[i] == NULL)
1488                                 continue;
1489                         opt_len = strlen(video_options[i]);
1490                         if (!opt_len)
1491                                 continue;
1492                         opt = video_options[i];
1493                         if (!strncmp(name, opt, name_len) &&
1494                             opt[name_len] == ':')
1495                                 options = opt + name_len + 1;
1496                 }
1497         }
1498         if (options && !strncmp(options, "off", 3))
1499                 retval = 1;
1500
1501         if (option)
1502                 *option = options;
1503
1504         return retval;
1505 }
1506
1507 #ifndef MODULE
1508 /**
1509  *      video_setup - process command line options
1510  *      @options: string of options
1511  *
1512  *      Process command line options for frame buffer subsystem.
1513  *
1514  *      NOTE: This function is a __setup and __init function.
1515  *            It only stores the options.  Drivers have to call
1516  *            fb_get_options() as necessary.
1517  *
1518  *      Returns zero.
1519  *
1520  */
1521 static int __init video_setup(char *options)
1522 {
1523         int i, global = 0;
1524
1525         if (!options || !*options)
1526                 global = 1;
1527
1528         if (!global && !strncmp(options, "ofonly", 6)) {
1529                 ofonly = 1;
1530                 global = 1;
1531         }
1532
1533         if (!global && !strstr(options, "fb:")) {
1534                 global_mode_option = options;
1535                 global = 1;
1536         }
1537
1538         if (!global) {
1539                 for (i = 0; i < FB_MAX; i++) {
1540                         if (video_options[i] == NULL) {
1541                                 video_options[i] = options;
1542                                 break;
1543                         }
1544
1545                 }
1546         }
1547
1548         return 1;
1549 }
1550 __setup("video=", video_setup);
1551 #endif
1552
1553     /*
1554      *  Visible symbols for modules
1555      */
1556
1557 EXPORT_SYMBOL(register_framebuffer);
1558 EXPORT_SYMBOL(unregister_framebuffer);
1559 EXPORT_SYMBOL(num_registered_fb);
1560 EXPORT_SYMBOL(registered_fb);
1561 EXPORT_SYMBOL(fb_prepare_logo);
1562 EXPORT_SYMBOL(fb_show_logo);
1563 EXPORT_SYMBOL(fb_set_var);
1564 EXPORT_SYMBOL(fb_blank);
1565 EXPORT_SYMBOL(fb_pan_display);
1566 EXPORT_SYMBOL(fb_get_buffer_offset);
1567 EXPORT_SYMBOL(fb_set_suspend);
1568 EXPORT_SYMBOL(fb_get_options);
1569
1570 MODULE_LICENSE("GPL");