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Initial commit
[wrt350n-kernel.git] / drivers / video / fbmem.c
blob1194f5e060ea679e56af87260162d2050d0716c3
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/smp_lock.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/mman.h>
25 #include <linux/vt.h>
26 #include <linux/init.h>
27 #include <linux/linux_logo.h>
28 #include <linux/proc_fs.h>
29 #include <linux/console.h>
30 #ifdef CONFIG_KMOD
31 #include <linux/kmod.h>
32 #endif
33 #include <linux/err.h>
34 #include <linux/device.h>
35 #include <linux/efi.h>
36 #include <linux/fb.h>
37
38 #include <asm/fb.h>
39
40
41 /*
42 * Frame buffer device initialization and setup routines
43 */
44
45 #define FBPIXMAPSIZE (1024 * 8)
46
47 struct fb_info *registered_fb[FB_MAX] __read_mostly;
48 int num_registered_fb __read_mostly;
49
50 /*
51 * Helpers
52 */
53
54 int fb_get_color_depth(struct fb_var_screeninfo *var,
55 struct fb_fix_screeninfo *fix)
56 {
57 int depth = 0;
58
59 if (fix->visual == FB_VISUAL_MONO01 ||
60 fix->visual == FB_VISUAL_MONO10)
61 depth = 1;
62 else {
63 if (var->green.length == var->blue.length &&
64 var->green.length == var->red.length &&
65 var->green.offset == var->blue.offset &&
66 var->green.offset == var->red.offset)
67 depth = var->green.length;
68 else
69 depth = var->green.length + var->red.length +
70 var->blue.length;
71 }
72
73 return depth;
74 }
75 EXPORT_SYMBOL(fb_get_color_depth);
76
77 /*
78 * Data padding functions.
79 */
80 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
81 {
82 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
83 }
84 EXPORT_SYMBOL(fb_pad_aligned_buffer);
85
86 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
87 u32 shift_high, u32 shift_low, u32 mod)
88 {
89 u8 mask = (u8) (0xfff << shift_high), tmp;
90 int i, j;
91
92 for (i = height; i--; ) {
93 for (j = 0; j < idx; j++) {
94 tmp = dst[j];
95 tmp &= mask;
96 tmp |= *src >> shift_low;
97 dst[j] = tmp;
98 tmp = *src << shift_high;
99 dst[j+1] = tmp;
100 src++;
101 }
102 tmp = dst[idx];
103 tmp &= mask;
104 tmp |= *src >> shift_low;
105 dst[idx] = tmp;
106 if (shift_high < mod) {
107 tmp = *src << shift_high;
108 dst[idx+1] = tmp;
109 }
110 src++;
111 dst += d_pitch;
112 }
113 }
114 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
115
116 /*
117 * we need to lock this section since fb_cursor
118 * may use fb_imageblit()
119 */
120 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
121 {
122 u32 align = buf->buf_align - 1, offset;
123 char *addr = buf->addr;
124
125 /* If IO mapped, we need to sync before access, no sharing of
126 * the pixmap is done
127 */
128 if (buf->flags & FB_PIXMAP_IO) {
129 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
130 info->fbops->fb_sync(info);
131 return addr;
132 }
133
134 /* See if we fit in the remaining pixmap space */
135 offset = buf->offset + align;
136 offset &= ~align;
137 if (offset + size > buf->size) {
138 /* We do not fit. In order to be able to re-use the buffer,
139 * we must ensure no asynchronous DMA'ing or whatever operation
140 * is in progress, we sync for that.
141 */
142 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
143 info->fbops->fb_sync(info);
144 offset = 0;
145 }
146 buf->offset = offset + size;
147 addr += offset;
148
149 return addr;
150 }
151
152 #ifdef CONFIG_LOGO
153
154 static inline unsigned safe_shift(unsigned d, int n)
155 {
156 return n < 0 ? d >> -n : d << n;
157 }
158
159 static void fb_set_logocmap(struct fb_info *info,
160 const struct linux_logo *logo)
161 {
162 struct fb_cmap palette_cmap;
163 u16 palette_green[16];
164 u16 palette_blue[16];
165 u16 palette_red[16];
166 int i, j, n;
167 const unsigned char *clut = logo->clut;
168
169 palette_cmap.start = 0;
170 palette_cmap.len = 16;
171 palette_cmap.red = palette_red;
172 palette_cmap.green = palette_green;
173 palette_cmap.blue = palette_blue;
174 palette_cmap.transp = NULL;
175
176 for (i = 0; i < logo->clutsize; i += n) {
177 n = logo->clutsize - i;
178 /* palette_cmap provides space for only 16 colors at once */
179 if (n > 16)
180 n = 16;
181 palette_cmap.start = 32 + i;
182 palette_cmap.len = n;
183 for (j = 0; j < n; ++j) {
184 palette_cmap.red[j] = clut[0] << 8 | clut[0];
185 palette_cmap.green[j] = clut[1] << 8 | clut[1];
186 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
187 clut += 3;
188 }
189 fb_set_cmap(&palette_cmap, info);
190 }
191 }
192
193 static void fb_set_logo_truepalette(struct fb_info *info,
194 const struct linux_logo *logo,
195 u32 *palette)
196 {
197 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
198 unsigned char redmask, greenmask, bluemask;
199 int redshift, greenshift, blueshift;
200 int i;
201 const unsigned char *clut = logo->clut;
202
203 /*
204 * We have to create a temporary palette since console palette is only
205 * 16 colors long.
206 */
207 /* Bug: Doesn't obey msb_right ... (who needs that?) */
208 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
209 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
210 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
211 redshift = info->var.red.offset - (8 - info->var.red.length);
212 greenshift = info->var.green.offset - (8 - info->var.green.length);
213 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
214
215 for ( i = 0; i < logo->clutsize; i++) {
216 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
217 safe_shift((clut[1] & greenmask), greenshift) |
218 safe_shift((clut[2] & bluemask), blueshift));
219 clut += 3;
220 }
221 }
222
223 static void fb_set_logo_directpalette(struct fb_info *info,
224 const struct linux_logo *logo,
225 u32 *palette)
226 {
227 int redshift, greenshift, blueshift;
228 int i;
229
230 redshift = info->var.red.offset;
231 greenshift = info->var.green.offset;
232 blueshift = info->var.blue.offset;
233
234 for (i = 32; i < logo->clutsize; i++)
235 palette[i] = i << redshift | i << greenshift | i << blueshift;
236 }
237
238 static void fb_set_logo(struct fb_info *info,
239 const struct linux_logo *logo, u8 *dst,
240 int depth)
241 {
242 int i, j, k;
243 const u8 *src = logo->data;
244 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
245 u8 fg = 1, d;
246
247 switch (fb_get_color_depth(&info->var, &info->fix)) {
248 case 1:
249 fg = 1;
250 break;
251 case 2:
252 fg = 3;
253 break;
254 default:
255 fg = 7;
256 break;
257 }
258
259 if (info->fix.visual == FB_VISUAL_MONO01 ||
260 info->fix.visual == FB_VISUAL_MONO10)
261 fg = ~((u8) (0xfff << info->var.green.length));
262
263 switch (depth) {
264 case 4:
265 for (i = 0; i < logo->height; i++)
266 for (j = 0; j < logo->width; src++) {
267 *dst++ = *src >> 4;
268 j++;
269 if (j < logo->width) {
270 *dst++ = *src & 0x0f;
271 j++;
272 }
273 }
274 break;
275 case 1:
276 for (i = 0; i < logo->height; i++) {
277 for (j = 0; j < logo->width; src++) {
278 d = *src ^ xor;
279 for (k = 7; k >= 0; k--) {
280 *dst++ = ((d >> k) & 1) ? fg : 0;
281 j++;
282 }
283 }
284 }
285 break;
286 }
287 }
288
289 /*
290 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
291 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
292 * the visual format and color depth of the framebuffer, the DAC, the
293 * pseudo_palette, and the logo data will be adjusted accordingly.
294 *
295 * Case 1 - linux_logo_clut224:
296 * Color exceeds the number of console colors (16), thus we set the hardware DAC
297 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
298 *
299 * For visuals that require color info from the pseudo_palette, we also construct
300 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
301 * will be set.
302 *
303 * Case 2 - linux_logo_vga16:
304 * The number of colors just matches the console colors, thus there is no need
305 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
306 * each byte contains color information for two pixels (upper and lower nibble).
307 * To be consistent with fb_imageblit() usage, we therefore separate the two
308 * nibbles into separate bytes. The "depth" flag will be set to 4.
309 *
310 * Case 3 - linux_logo_mono:
311 * This is similar with Case 2. Each byte contains information for 8 pixels.
312 * We isolate each bit and expand each into a byte. The "depth" flag will
313 * be set to 1.
314 */
315 static struct logo_data {
316 int depth;
317 int needs_directpalette;
318 int needs_truepalette;
319 int needs_cmapreset;
320 const struct linux_logo *logo;
321 } fb_logo __read_mostly;
322
323 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
324 {
325 u32 size = width * height, i;
326
327 out += size - 1;
328
329 for (i = size; i--; )
330 *out-- = *in++;
331 }
332
333 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
334 {
335 int i, j, h = height - 1;
336
337 for (i = 0; i < height; i++)
338 for (j = 0; j < width; j++)
339 out[height * j + h - i] = *in++;
340 }
341
342 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
343 {
344 int i, j, w = width - 1;
345
346 for (i = 0; i < height; i++)
347 for (j = 0; j < width; j++)
348 out[height * (w - j) + i] = *in++;
349 }
350
351 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
352 struct fb_image *image, int rotate)
353 {
354 u32 tmp;
355
356 if (rotate == FB_ROTATE_UD) {
357 fb_rotate_logo_ud(image->data, dst, image->width,
358 image->height);
359 image->dx = info->var.xres - image->width - image->dx;
360 image->dy = info->var.yres - image->height - image->dy;
361 } else if (rotate == FB_ROTATE_CW) {
362 fb_rotate_logo_cw(image->data, dst, image->width,
363 image->height);
364 tmp = image->width;
365 image->width = image->height;
366 image->height = tmp;
367 tmp = image->dy;
368 image->dy = image->dx;
369 image->dx = info->var.xres - image->width - tmp;
370 } else if (rotate == FB_ROTATE_CCW) {
371 fb_rotate_logo_ccw(image->data, dst, image->width,
372 image->height);
373 tmp = image->width;
374 image->width = image->height;
375 image->height = tmp;
376 tmp = image->dx;
377 image->dx = image->dy;
378 image->dy = info->var.yres - image->height - tmp;
379 }
380
381 image->data = dst;
382 }
383
384 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
385 int rotate, unsigned int num)
386 {
387 unsigned int x;
388
389 if (rotate == FB_ROTATE_UR) {
390 for (x = 0;
391 x < num && image->dx + image->width <= info->var.xres;
392 x++) {
393 info->fbops->fb_imageblit(info, image);
394 image->dx += image->width + 8;
395 }
396 } else if (rotate == FB_ROTATE_UD) {
397 for (x = 0; x < num && image->dx >= 0; x++) {
398 info->fbops->fb_imageblit(info, image);
399 image->dx -= image->width + 8;
400 }
401 } else if (rotate == FB_ROTATE_CW) {
402 for (x = 0;
403 x < num && image->dy + image->height <= info->var.yres;
404 x++) {
405 info->fbops->fb_imageblit(info, image);
406 image->dy += image->height + 8;
407 }
408 } else if (rotate == FB_ROTATE_CCW) {
409 for (x = 0; x < num && image->dy >= 0; x++) {
410 info->fbops->fb_imageblit(info, image);
411 image->dy -= image->height + 8;
412 }
413 }
414 }
415
416 static int fb_show_logo_line(struct fb_info *info, int rotate,
417 const struct linux_logo *logo, int y,
418 unsigned int n)
419 {
420 u32 *palette = NULL, *saved_pseudo_palette = NULL;
421 unsigned char *logo_new = NULL, *logo_rotate = NULL;
422 struct fb_image image;
423
424 /* Return if the frame buffer is not mapped or suspended */
425 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
426 info->flags & FBINFO_MODULE)
427 return 0;
428
429 image.depth = 8;
430 image.data = logo->data;
431
432 if (fb_logo.needs_cmapreset)
433 fb_set_logocmap(info, logo);
434
435 if (fb_logo.needs_truepalette ||
436 fb_logo.needs_directpalette) {
437 palette = kmalloc(256 * 4, GFP_KERNEL);
438 if (palette == NULL)
439 return 0;
440
441 if (fb_logo.needs_truepalette)
442 fb_set_logo_truepalette(info, logo, palette);
443 else
444 fb_set_logo_directpalette(info, logo, palette);
445
446 saved_pseudo_palette = info->pseudo_palette;
447 info->pseudo_palette = palette;
448 }
449
450 if (fb_logo.depth <= 4) {
451 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
452 if (logo_new == NULL) {
453 kfree(palette);
454 if (saved_pseudo_palette)
455 info->pseudo_palette = saved_pseudo_palette;
456 return 0;
457 }
458 image.data = logo_new;
459 fb_set_logo(info, logo, logo_new, fb_logo.depth);
460 }
461
462 image.dx = 0;
463 image.dy = y;
464 image.width = logo->width;
465 image.height = logo->height;
466
467 if (rotate) {
468 logo_rotate = kmalloc(logo->width *
469 logo->height, GFP_KERNEL);
470 if (logo_rotate)
471 fb_rotate_logo(info, logo_rotate, &image, rotate);
472 }
473
474 fb_do_show_logo(info, &image, rotate, n);
475
476 kfree(palette);
477 if (saved_pseudo_palette != NULL)
478 info->pseudo_palette = saved_pseudo_palette;
479 kfree(logo_new);
480 kfree(logo_rotate);
481 return logo->height;
482 }
483
484
485 #ifdef CONFIG_FB_LOGO_EXTRA
486
487 #define FB_LOGO_EX_NUM_MAX 10
488 static struct logo_data_extra {
489 const struct linux_logo *logo;
490 unsigned int n;
491 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
492 static unsigned int fb_logo_ex_num;
493
494 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
495 {
496 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
497 return;
498
499 fb_logo_ex[fb_logo_ex_num].logo = logo;
500 fb_logo_ex[fb_logo_ex_num].n = n;
501 fb_logo_ex_num++;
502 }
503
504 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
505 unsigned int yres)
506 {
507 unsigned int i;
508
509 /* FIXME: logo_ex supports only truecolor fb. */
510 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
511 fb_logo_ex_num = 0;
512
513 for (i = 0; i < fb_logo_ex_num; i++) {
514 height += fb_logo_ex[i].logo->height;
515 if (height > yres) {
516 height -= fb_logo_ex[i].logo->height;
517 fb_logo_ex_num = i;
518 break;
519 }
520 }
521 return height;
522 }
523
524 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
525 {
526 unsigned int i;
527
528 for (i = 0; i < fb_logo_ex_num; i++)
529 y += fb_show_logo_line(info, rotate,
530 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
531
532 return y;
533 }
534
535 #else /* !CONFIG_FB_LOGO_EXTRA */
536
537 static inline int fb_prepare_extra_logos(struct fb_info *info,
538 unsigned int height,
539 unsigned int yres)
540 {
541 return height;
542 }
543
544 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
545 {
546 return y;
547 }
548
549 #endif /* CONFIG_FB_LOGO_EXTRA */
550
551
552 int fb_prepare_logo(struct fb_info *info, int rotate)
553 {
554 int depth = fb_get_color_depth(&info->var, &info->fix);
555 unsigned int yres;
556
557 memset(&fb_logo, 0, sizeof(struct logo_data));
558
559 if (info->flags & FBINFO_MISC_TILEBLITTING ||
560 info->flags & FBINFO_MODULE)
561 return 0;
562
563 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
564 depth = info->var.blue.length;
565 if (info->var.red.length < depth)
566 depth = info->var.red.length;
567 if (info->var.green.length < depth)
568 depth = info->var.green.length;
569 }
570
571 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
572 /* assume console colormap */
573 depth = 4;
574 }
575
576 /* Return if no suitable logo was found */
577 fb_logo.logo = fb_find_logo(depth);
578
579 if (!fb_logo.logo) {
580 return 0;
581 }
582
583 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
584 yres = info->var.yres;
585 else
586 yres = info->var.xres;
587
588 if (fb_logo.logo->height > yres) {
589 fb_logo.logo = NULL;
590 return 0;
591 }
592
593 /* What depth we asked for might be different from what we get */
594 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
595 fb_logo.depth = 8;
596 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
597 fb_logo.depth = 4;
598 else
599 fb_logo.depth = 1;
600
601
602 if (fb_logo.depth > 4 && depth > 4) {
603 switch (info->fix.visual) {
604 case FB_VISUAL_TRUECOLOR:
605 fb_logo.needs_truepalette = 1;
606 break;
607 case FB_VISUAL_DIRECTCOLOR:
608 fb_logo.needs_directpalette = 1;
609 fb_logo.needs_cmapreset = 1;
610 break;
611 case FB_VISUAL_PSEUDOCOLOR:
612 fb_logo.needs_cmapreset = 1;
613 break;
614 }
615 }
616
617 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
618 }
619
620 int fb_show_logo(struct fb_info *info, int rotate)
621 {
622 int y;
623
624 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
625 num_online_cpus());
626 y = fb_show_extra_logos(info, y, rotate);
627
628 return y;
629 }
630 #else
631 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
632 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
633 #endif /* CONFIG_LOGO */
634
635 static int fbmem_read_proc(char *buf, char **start, off_t offset,
636 int len, int *eof, void *private)
637 {
638 struct fb_info **fi;
639 int clen;
640
641 clen = 0;
642 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
643 fi++)
644 if (*fi)
645 clen += sprintf(buf + clen, "%d %s\n",
646 (*fi)->node,
647 (*fi)->fix.id);
648 *start = buf + offset;
649 if (clen > offset)
650 clen -= offset;
651 else
652 clen = 0;
653 return clen < len ? clen : len;
654 }
655
656 static ssize_t
657 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
658 {
659 unsigned long p = *ppos;
660 struct inode *inode = file->f_path.dentry->d_inode;
661 int fbidx = iminor(inode);
662 struct fb_info *info = registered_fb[fbidx];
663 u32 *buffer, *dst;
664 u32 __iomem *src;
665 int c, i, cnt = 0, err = 0;
666 unsigned long total_size;
667
668 if (!info || ! info->screen_base)
669 return -ENODEV;
670
671 if (info->state != FBINFO_STATE_RUNNING)
672 return -EPERM;
673
674 if (info->fbops->fb_read)
675 return info->fbops->fb_read(info, buf, count, ppos);
676
677 total_size = info->screen_size;
678
679 if (total_size == 0)
680 total_size = info->fix.smem_len;
681
682 if (p >= total_size)
683 return 0;
684
685 if (count >= total_size)
686 count = total_size;
687
688 if (count + p > total_size)
689 count = total_size - p;
690
691 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
692 GFP_KERNEL);
693 if (!buffer)
694 return -ENOMEM;
695
696 src = (u32 __iomem *) (info->screen_base + p);
697
698 if (info->fbops->fb_sync)
699 info->fbops->fb_sync(info);
700
701 while (count) {
702 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
703 dst = buffer;
704 for (i = c >> 2; i--; )
705 *dst++ = fb_readl(src++);
706 if (c & 3) {
707 u8 *dst8 = (u8 *) dst;
708 u8 __iomem *src8 = (u8 __iomem *) src;
709
710 for (i = c & 3; i--;)
711 *dst8++ = fb_readb(src8++);
712
713 src = (u32 __iomem *) src8;
714 }
715
716 if (copy_to_user(buf, buffer, c)) {
717 err = -EFAULT;
718 break;
719 }
720 *ppos += c;
721 buf += c;
722 cnt += c;
723 count -= c;
724 }
725
726 kfree(buffer);
727
728 return (err) ? err : cnt;
729 }
730
731 static ssize_t
732 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
733 {
734 unsigned long p = *ppos;
735 struct inode *inode = file->f_path.dentry->d_inode;
736 int fbidx = iminor(inode);
737 struct fb_info *info = registered_fb[fbidx];
738 u32 *buffer, *src;
739 u32 __iomem *dst;
740 int c, i, cnt = 0, err = 0;
741 unsigned long total_size;
742
743 if (!info || !info->screen_base)
744 return -ENODEV;
745
746 if (info->state != FBINFO_STATE_RUNNING)
747 return -EPERM;
748
749 if (info->fbops->fb_write)
750 return info->fbops->fb_write(info, buf, count, ppos);
751
752 total_size = info->screen_size;
753
754 if (total_size == 0)
755 total_size = info->fix.smem_len;
756
757 if (p > total_size)
758 return -EFBIG;
759
760 if (count > total_size) {
761 err = -EFBIG;
762 count = total_size;
763 }
764
765 if (count + p > total_size) {
766 if (!err)
767 err = -ENOSPC;
768
769 count = total_size - p;
770 }
771
772 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
773 GFP_KERNEL);
774 if (!buffer)
775 return -ENOMEM;
776
777 dst = (u32 __iomem *) (info->screen_base + p);
778
779 if (info->fbops->fb_sync)
780 info->fbops->fb_sync(info);
781
782 while (count) {
783 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
784 src = buffer;
785
786 if (copy_from_user(src, buf, c)) {
787 err = -EFAULT;
788 break;
789 }
790
791 for (i = c >> 2; i--; )
792 fb_writel(*src++, dst++);
793
794 if (c & 3) {
795 u8 *src8 = (u8 *) src;
796 u8 __iomem *dst8 = (u8 __iomem *) dst;
797
798 for (i = c & 3; i--; )
799 fb_writeb(*src8++, dst8++);
800
801 dst = (u32 __iomem *) dst8;
802 }
803
804 *ppos += c;
805 buf += c;
806 cnt += c;
807 count -= c;
808 }
809
810 kfree(buffer);
811
812 return (cnt) ? cnt : err;
813 }
814
815 #ifdef CONFIG_KMOD
816 static void try_to_load(int fb)
817 {
818 request_module("fb%d", fb);
819 }
820 #endif /* CONFIG_KMOD */
821
822 int
823 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
824 {
825 struct fb_fix_screeninfo *fix = &info->fix;
826 int xoffset = var->xoffset;
827 int yoffset = var->yoffset;
828 int err = 0, yres = info->var.yres;
829
830 if (var->yoffset > 0) {
831 if (var->vmode & FB_VMODE_YWRAP) {
832 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
833 err = -EINVAL;
834 else
835 yres = 0;
836 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
837 err = -EINVAL;
838 }
839
840 if (var->xoffset > 0 && (!fix->xpanstep ||
841 (var->xoffset % fix->xpanstep)))
842 err = -EINVAL;
843
844 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
845 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
846 var->xoffset + info->var.xres > info->var.xres_virtual)
847 return -EINVAL;
848
849 if ((err = info->fbops->fb_pan_display(var, info)))
850 return err;
851 info->var.xoffset = var->xoffset;
852 info->var.yoffset = var->yoffset;
853 if (var->vmode & FB_VMODE_YWRAP)
854 info->var.vmode |= FB_VMODE_YWRAP;
855 else
856 info->var.vmode &= ~FB_VMODE_YWRAP;
857 return 0;
858 }
859
860 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
861 u32 activate)
862 {
863 struct fb_event event;
864 struct fb_blit_caps caps, fbcaps;
865 int err = 0;
866
867 memset(&caps, 0, sizeof(caps));
868 memset(&fbcaps, 0, sizeof(fbcaps));
869 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
870 event.info = info;
871 event.data = &caps;
872 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
873 info->fbops->fb_get_caps(info, &fbcaps, var);
874
875 if (((fbcaps.x ^ caps.x) & caps.x) ||
876 ((fbcaps.y ^ caps.y) & caps.y) ||
877 (fbcaps.len < caps.len))
878 err = -EINVAL;
879
880 return err;
881 }
882
883 int
884 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
885 {
886 int flags = info->flags;
887 int ret = 0;
888
889 if (var->activate & FB_ACTIVATE_INV_MODE) {
890 struct fb_videomode mode1, mode2;
891
892 fb_var_to_videomode(&mode1, var);
893 fb_var_to_videomode(&mode2, &info->var);
894 /* make sure we don't delete the videomode of current var */
895 ret = fb_mode_is_equal(&mode1, &mode2);
896
897 if (!ret) {
898 struct fb_event event;
899
900 event.info = info;
901 event.data = &mode1;
902 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
903 }
904
905 if (!ret)
906 fb_delete_videomode(&mode1, &info->modelist);
907
908
909 ret = (ret) ? -EINVAL : 0;
910 goto done;
911 }
912
913 if ((var->activate & FB_ACTIVATE_FORCE) ||
914 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
915 u32 activate = var->activate;
916
917 if (!info->fbops->fb_check_var) {
918 *var = info->var;
919 goto done;
920 }
921
922 ret = info->fbops->fb_check_var(var, info);
923
924 if (ret)
925 goto done;
926
927 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
928 struct fb_videomode mode;
929
930 if (info->fbops->fb_get_caps) {
931 ret = fb_check_caps(info, var, activate);
932
933 if (ret)
934 goto done;
935 }
936
937 info->var = *var;
938
939 if (info->fbops->fb_set_par)
940 info->fbops->fb_set_par(info);
941
942 fb_pan_display(info, &info->var);
943 fb_set_cmap(&info->cmap, info);
944 fb_var_to_videomode(&mode, &info->var);
945
946 if (info->modelist.prev && info->modelist.next &&
947 !list_empty(&info->modelist))
948 ret = fb_add_videomode(&mode, &info->modelist);
949
950 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
951 struct fb_event event;
952 int evnt = (activate & FB_ACTIVATE_ALL) ?
953 FB_EVENT_MODE_CHANGE_ALL :
954 FB_EVENT_MODE_CHANGE;
955
956 info->flags &= ~FBINFO_MISC_USEREVENT;
957 event.info = info;
958 fb_notifier_call_chain(evnt, &event);
959 }
960 }
961 }
962
963 done:
964 return ret;
965 }
966
967 int
968 fb_blank(struct fb_info *info, int blank)
969 {
970 int ret = -EINVAL;
971
972 if (blank > FB_BLANK_POWERDOWN)
973 blank = FB_BLANK_POWERDOWN;
974
975 if (info->fbops->fb_blank)
976 ret = info->fbops->fb_blank(blank, info);
977
978 if (!ret) {
979 struct fb_event event;
980
981 event.info = info;
982 event.data = &blank;
983 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
984 }
985
986 return ret;
987 }
988
989 static int
990 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
991 unsigned long arg)
992 {
993 int fbidx = iminor(inode);
994 struct fb_info *info = registered_fb[fbidx];
995 struct fb_ops *fb = info->fbops;
996 struct fb_var_screeninfo var;
997 struct fb_fix_screeninfo fix;
998 struct fb_con2fbmap con2fb;
999 struct fb_cmap_user cmap;
1000 struct fb_event event;
1001 void __user *argp = (void __user *)arg;
1002 int i;
1003
1004 if (!fb)
1005 return -ENODEV;
1006 switch (cmd) {
1007 case FBIOGET_VSCREENINFO:
1008 return copy_to_user(argp, &info->var,
1009 sizeof(var)) ? -EFAULT : 0;
1010 case FBIOPUT_VSCREENINFO:
1011 if (copy_from_user(&var, argp, sizeof(var)))
1012 return -EFAULT;
1013 acquire_console_sem();
1014 info->flags |= FBINFO_MISC_USEREVENT;
1015 i = fb_set_var(info, &var);
1016 info->flags &= ~FBINFO_MISC_USEREVENT;
1017 release_console_sem();
1018 if (i) return i;
1019 if (copy_to_user(argp, &var, sizeof(var)))
1020 return -EFAULT;
1021 return 0;
1022 case FBIOGET_FSCREENINFO:
1023 return copy_to_user(argp, &info->fix,
1024 sizeof(fix)) ? -EFAULT : 0;
1025 case FBIOPUTCMAP:
1026 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1027 return -EFAULT;
1028 return (fb_set_user_cmap(&cmap, info));
1029 case FBIOGETCMAP:
1030 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1031 return -EFAULT;
1032 return fb_cmap_to_user(&info->cmap, &cmap);
1033 case FBIOPAN_DISPLAY:
1034 if (copy_from_user(&var, argp, sizeof(var)))
1035 return -EFAULT;
1036 acquire_console_sem();
1037 i = fb_pan_display(info, &var);
1038 release_console_sem();
1039 if (i)
1040 return i;
1041 if (copy_to_user(argp, &var, sizeof(var)))
1042 return -EFAULT;
1043 return 0;
1044 case FBIO_CURSOR:
1045 return -EINVAL;
1046 case FBIOGET_CON2FBMAP:
1047 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1048 return -EFAULT;
1049 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1050 return -EINVAL;
1051 con2fb.framebuffer = -1;
1052 event.info = info;
1053 event.data = &con2fb;
1054 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1055 return copy_to_user(argp, &con2fb,
1056 sizeof(con2fb)) ? -EFAULT : 0;
1057 case FBIOPUT_CON2FBMAP:
1058 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1059 return - EFAULT;
1060 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
1061 return -EINVAL;
1062 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1063 return -EINVAL;
1064 #ifdef CONFIG_KMOD
1065 if (!registered_fb[con2fb.framebuffer])
1066 try_to_load(con2fb.framebuffer);
1067 #endif /* CONFIG_KMOD */
1068 if (!registered_fb[con2fb.framebuffer])
1069 return -EINVAL;
1070 event.info = info;
1071 event.data = &con2fb;
1072 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1073 &event);
1074 case FBIOBLANK:
1075 acquire_console_sem();
1076 info->flags |= FBINFO_MISC_USEREVENT;
1077 i = fb_blank(info, arg);
1078 info->flags &= ~FBINFO_MISC_USEREVENT;
1079 release_console_sem();
1080 return i;
1081 default:
1082 if (fb->fb_ioctl == NULL)
1083 return -EINVAL;
1084 return fb->fb_ioctl(info, cmd, arg);
1085 }
1086 }
1087
1088 #ifdef CONFIG_COMPAT
1089 struct fb_fix_screeninfo32 {
1090 char id[16];
1091 compat_caddr_t smem_start;
1092 u32 smem_len;
1093 u32 type;
1094 u32 type_aux;
1095 u32 visual;
1096 u16 xpanstep;
1097 u16 ypanstep;
1098 u16 ywrapstep;
1099 u32 line_length;
1100 compat_caddr_t mmio_start;
1101 u32 mmio_len;
1102 u32 accel;
1103 u16 reserved[3];
1104 };
1105
1106 struct fb_cmap32 {
1107 u32 start;
1108 u32 len;
1109 compat_caddr_t red;
1110 compat_caddr_t green;
1111 compat_caddr_t blue;
1112 compat_caddr_t transp;
1113 };
1114
1115 static int fb_getput_cmap(struct inode *inode, struct file *file,
1116 unsigned int cmd, unsigned long arg)
1117 {
1118 struct fb_cmap_user __user *cmap;
1119 struct fb_cmap32 __user *cmap32;
1120 __u32 data;
1121 int err;
1122
1123 cmap = compat_alloc_user_space(sizeof(*cmap));
1124 cmap32 = compat_ptr(arg);
1125
1126 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1127 return -EFAULT;
1128
1129 if (get_user(data, &cmap32->red) ||
1130 put_user(compat_ptr(data), &cmap->red) ||
1131 get_user(data, &cmap32->green) ||
1132 put_user(compat_ptr(data), &cmap->green) ||
1133 get_user(data, &cmap32->blue) ||
1134 put_user(compat_ptr(data), &cmap->blue) ||
1135 get_user(data, &cmap32->transp) ||
1136 put_user(compat_ptr(data), &cmap->transp))
1137 return -EFAULT;
1138
1139 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1140
1141 if (!err) {
1142 if (copy_in_user(&cmap32->start,
1143 &cmap->start,
1144 2 * sizeof(__u32)))
1145 err = -EFAULT;
1146 }
1147 return err;
1148 }
1149
1150 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1151 struct fb_fix_screeninfo32 __user *fix32)
1152 {
1153 __u32 data;
1154 int err;
1155
1156 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1157
1158 data = (__u32) (unsigned long) fix->smem_start;
1159 err |= put_user(data, &fix32->smem_start);
1160
1161 err |= put_user(fix->smem_len, &fix32->smem_len);
1162 err |= put_user(fix->type, &fix32->type);
1163 err |= put_user(fix->type_aux, &fix32->type_aux);
1164 err |= put_user(fix->visual, &fix32->visual);
1165 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1166 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1167 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1168 err |= put_user(fix->line_length, &fix32->line_length);
1169
1170 data = (__u32) (unsigned long) fix->mmio_start;
1171 err |= put_user(data, &fix32->mmio_start);
1172
1173 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1174 err |= put_user(fix->accel, &fix32->accel);
1175 err |= copy_to_user(fix32->reserved, fix->reserved,
1176 sizeof(fix->reserved));
1177
1178 return err;
1179 }
1180
1181 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1182 unsigned int cmd, unsigned long arg)
1183 {
1184 mm_segment_t old_fs;
1185 struct fb_fix_screeninfo fix;
1186 struct fb_fix_screeninfo32 __user *fix32;
1187 int err;
1188
1189 fix32 = compat_ptr(arg);
1190
1191 old_fs = get_fs();
1192 set_fs(KERNEL_DS);
1193 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1194 set_fs(old_fs);
1195
1196 if (!err)
1197 err = do_fscreeninfo_to_user(&fix, fix32);
1198
1199 return err;
1200 }
1201
1202 static long
1203 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1204 {
1205 struct inode *inode = file->f_path.dentry->d_inode;
1206 int fbidx = iminor(inode);
1207 struct fb_info *info = registered_fb[fbidx];
1208 struct fb_ops *fb = info->fbops;
1209 long ret = -ENOIOCTLCMD;
1210
1211 lock_kernel();
1212 switch(cmd) {
1213 case FBIOGET_VSCREENINFO:
1214 case FBIOPUT_VSCREENINFO:
1215 case FBIOPAN_DISPLAY:
1216 case FBIOGET_CON2FBMAP:
1217 case FBIOPUT_CON2FBMAP:
1218 arg = (unsigned long) compat_ptr(arg);
1219 case FBIOBLANK:
1220 ret = fb_ioctl(inode, file, cmd, arg);
1221 break;
1222
1223 case FBIOGET_FSCREENINFO:
1224 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1225 break;
1226
1227 case FBIOGETCMAP:
1228 case FBIOPUTCMAP:
1229 ret = fb_getput_cmap(inode, file, cmd, arg);
1230 break;
1231
1232 default:
1233 if (fb->fb_compat_ioctl)
1234 ret = fb->fb_compat_ioctl(info, cmd, arg);
1235 break;
1236 }
1237 unlock_kernel();
1238 return ret;
1239 }
1240 #endif
1241
1242 static int
1243 fb_mmap(struct file *file, struct vm_area_struct * vma)
1244 {
1245 int fbidx = iminor(file->f_path.dentry->d_inode);
1246 struct fb_info *info = registered_fb[fbidx];
1247 struct fb_ops *fb = info->fbops;
1248 unsigned long off;
1249 unsigned long start;
1250 u32 len;
1251
1252 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1253 return -EINVAL;
1254 off = vma->vm_pgoff << PAGE_SHIFT;
1255 if (!fb)
1256 return -ENODEV;
1257 if (fb->fb_mmap) {
1258 int res;
1259 lock_kernel();
1260 res = fb->fb_mmap(info, vma);
1261 unlock_kernel();
1262 return res;
1263 }
1264
1265 lock_kernel();
1266
1267 /* frame buffer memory */
1268 start = info->fix.smem_start;
1269 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1270 if (off >= len) {
1271 /* memory mapped io */
1272 off -= len;
1273 if (info->var.accel_flags) {
1274 unlock_kernel();
1275 return -EINVAL;
1276 }
1277 start = info->fix.mmio_start;
1278 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1279 }
1280 unlock_kernel();
1281 start &= PAGE_MASK;
1282 if ((vma->vm_end - vma->vm_start + off) > len)
1283 return -EINVAL;
1284 off += start;
1285 vma->vm_pgoff = off >> PAGE_SHIFT;
1286 /* This is an IO map - tell maydump to skip this VMA */
1287 vma->vm_flags |= VM_IO | VM_RESERVED;
1288 fb_pgprotect(file, vma, off);
1289 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1290 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1291 return -EAGAIN;
1292 return 0;
1293 }
1294
1295 static int
1296 fb_open(struct inode *inode, struct file *file)
1297 {
1298 int fbidx = iminor(inode);
1299 struct fb_info *info;
1300 int res = 0;
1301
1302 if (fbidx >= FB_MAX)
1303 return -ENODEV;
1304 #ifdef CONFIG_KMOD
1305 if (!(info = registered_fb[fbidx]))
1306 try_to_load(fbidx);
1307 #endif /* CONFIG_KMOD */
1308 if (!(info = registered_fb[fbidx]))
1309 return -ENODEV;
1310 if (!try_module_get(info->fbops->owner))
1311 return -ENODEV;
1312 file->private_data = info;
1313 if (info->fbops->fb_open) {
1314 res = info->fbops->fb_open(info,1);
1315 if (res)
1316 module_put(info->fbops->owner);
1317 }
1318 return res;
1319 }
1320
1321 static int
1322 fb_release(struct inode *inode, struct file *file)
1323 {
1324 struct fb_info * const info = file->private_data;
1325
1326 lock_kernel();
1327 if (info->fbops->fb_release)
1328 info->fbops->fb_release(info,1);
1329 module_put(info->fbops->owner);
1330 unlock_kernel();
1331 return 0;
1332 }
1333
1334 static const struct file_operations fb_fops = {
1335 .owner = THIS_MODULE,
1336 .read = fb_read,
1337 .write = fb_write,
1338 .ioctl = fb_ioctl,
1339 #ifdef CONFIG_COMPAT
1340 .compat_ioctl = fb_compat_ioctl,
1341 #endif
1342 .mmap = fb_mmap,
1343 .open = fb_open,
1344 .release = fb_release,
1345 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1346 .get_unmapped_area = get_fb_unmapped_area,
1347 #endif
1348 #ifdef CONFIG_FB_DEFERRED_IO
1349 .fsync = fb_deferred_io_fsync,
1350 #endif
1351 };
1352
1353 struct class *fb_class;
1354 EXPORT_SYMBOL(fb_class);
1355 /**
1356 * register_framebuffer - registers a frame buffer device
1357 * @fb_info: frame buffer info structure
1358 *
1359 * Registers a frame buffer device @fb_info.
1360 *
1361 * Returns negative errno on error, or zero for success.
1362 *
1363 */
1364
1365 int
1366 register_framebuffer(struct fb_info *fb_info)
1367 {
1368 int i;
1369 struct fb_event event;
1370 struct fb_videomode mode;
1371
1372 if (num_registered_fb == FB_MAX)
1373 return -ENXIO;
1374 num_registered_fb++;
1375 for (i = 0 ; i < FB_MAX; i++)
1376 if (!registered_fb[i])
1377 break;
1378 fb_info->node = i;
1379
1380 fb_info->dev = device_create(fb_class, fb_info->device,
1381 MKDEV(FB_MAJOR, i), "fb%d", i);
1382 if (IS_ERR(fb_info->dev)) {
1383 /* Not fatal */
1384 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1385 fb_info->dev = NULL;
1386 } else
1387 fb_init_device(fb_info);
1388
1389 if (fb_info->pixmap.addr == NULL) {
1390 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1391 if (fb_info->pixmap.addr) {
1392 fb_info->pixmap.size = FBPIXMAPSIZE;
1393 fb_info->pixmap.buf_align = 1;
1394 fb_info->pixmap.scan_align = 1;
1395 fb_info->pixmap.access_align = 32;
1396 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1397 }
1398 }
1399 fb_info->pixmap.offset = 0;
1400
1401 if (!fb_info->pixmap.blit_x)
1402 fb_info->pixmap.blit_x = ~(u32)0;
1403
1404 if (!fb_info->pixmap.blit_y)
1405 fb_info->pixmap.blit_y = ~(u32)0;
1406
1407 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1408 INIT_LIST_HEAD(&fb_info->modelist);
1409
1410 fb_var_to_videomode(&mode, &fb_info->var);
1411 fb_add_videomode(&mode, &fb_info->modelist);
1412 registered_fb[i] = fb_info;
1413
1414 event.info = fb_info;
1415 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1416 return 0;
1417 }
1418
1419
1420 /**
1421 * unregister_framebuffer - releases a frame buffer device
1422 * @fb_info: frame buffer info structure
1423 *
1424 * Unregisters a frame buffer device @fb_info.
1425 *
1426 * Returns negative errno on error, or zero for success.
1427 *
1428 * This function will also notify the framebuffer console
1429 * to release the driver.
1430 *
1431 * This is meant to be called within a driver's module_exit()
1432 * function. If this is called outside module_exit(), ensure
1433 * that the driver implements fb_open() and fb_release() to
1434 * check that no processes are using the device.
1435 */
1436
1437 int
1438 unregister_framebuffer(struct fb_info *fb_info)
1439 {
1440 struct fb_event event;
1441 int i, ret = 0;
1442
1443 i = fb_info->node;
1444 if (!registered_fb[i]) {
1445 ret = -EINVAL;
1446 goto done;
1447 }
1448
1449 event.info = fb_info;
1450 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1451
1452 if (ret) {
1453 ret = -EINVAL;
1454 goto done;
1455 }
1456
1457 if (fb_info->pixmap.addr &&
1458 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1459 kfree(fb_info->pixmap.addr);
1460 fb_destroy_modelist(&fb_info->modelist);
1461 registered_fb[i]=NULL;
1462 num_registered_fb--;
1463 fb_cleanup_device(fb_info);
1464 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1465 event.info = fb_info;
1466 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1467 done:
1468 return ret;
1469 }
1470
1471 /**
1472 * fb_set_suspend - low level driver signals suspend
1473 * @info: framebuffer affected
1474 * @state: 0 = resuming, !=0 = suspending
1475 *
1476 * This is meant to be used by low level drivers to
1477 * signal suspend/resume to the core & clients.
1478 * It must be called with the console semaphore held
1479 */
1480 void fb_set_suspend(struct fb_info *info, int state)
1481 {
1482 struct fb_event event;
1483
1484 event.info = info;
1485 if (state) {
1486 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1487 info->state = FBINFO_STATE_SUSPENDED;
1488 } else {
1489 info->state = FBINFO_STATE_RUNNING;
1490 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1491 }
1492 }
1493
1494 /**
1495 * fbmem_init - init frame buffer subsystem
1496 *
1497 * Initialize the frame buffer subsystem.
1498 *
1499 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1500 *
1501 */
1502
1503 static int __init
1504 fbmem_init(void)
1505 {
1506 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1507
1508 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1509 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1510
1511 fb_class = class_create(THIS_MODULE, "graphics");
1512 if (IS_ERR(fb_class)) {
1513 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1514 fb_class = NULL;
1515 }
1516 return 0;
1517 }
1518
1519 #ifdef MODULE
1520 module_init(fbmem_init);
1521 static void __exit
1522 fbmem_exit(void)
1523 {
1524 class_destroy(fb_class);
1525 unregister_chrdev(FB_MAJOR, "fb");
1526 }
1527
1528 module_exit(fbmem_exit);
1529 MODULE_LICENSE("GPL");
1530 MODULE_DESCRIPTION("Framebuffer base");
1531 #else
1532 subsys_initcall(fbmem_init);
1533 #endif
1534
1535 int fb_new_modelist(struct fb_info *info)
1536 {
1537 struct fb_event event;
1538 struct fb_var_screeninfo var = info->var;
1539 struct list_head *pos, *n;
1540 struct fb_modelist *modelist;
1541 struct fb_videomode *m, mode;
1542 int err = 1;
1543
1544 list_for_each_safe(pos, n, &info->modelist) {
1545 modelist = list_entry(pos, struct fb_modelist, list);
1546 m = &modelist->mode;
1547 fb_videomode_to_var(&var, m);
1548 var.activate = FB_ACTIVATE_TEST;
1549 err = fb_set_var(info, &var);
1550 fb_var_to_videomode(&mode, &var);
1551 if (err || !fb_mode_is_equal(m, &mode)) {
1552 list_del(pos);
1553 kfree(pos);
1554 }
1555 }
1556
1557 err = 1;
1558
1559 if (!list_empty(&info->modelist)) {
1560 event.info = info;
1561 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1562 }
1563
1564 return err;
1565 }
1566
1567 static char *video_options[FB_MAX] __read_mostly;
1568 static int ofonly __read_mostly;
1569
1570 /**
1571 * fb_get_options - get kernel boot parameters
1572 * @name: framebuffer name as it would appear in
1573 * the boot parameter line
1574 * (video=<name>:<options>)
1575 * @option: the option will be stored here
1576 *
1577 * NOTE: Needed to maintain backwards compatibility
1578 */
1579 int fb_get_options(char *name, char **option)
1580 {
1581 char *opt, *options = NULL;
1582 int opt_len, retval = 0;
1583 int name_len = strlen(name), i;
1584
1585 if (name_len && ofonly && strncmp(name, "offb", 4))
1586 retval = 1;
1587
1588 if (name_len && !retval) {
1589 for (i = 0; i < FB_MAX; i++) {
1590 if (video_options[i] == NULL)
1591 continue;
1592 opt_len = strlen(video_options[i]);
1593 if (!opt_len)
1594 continue;
1595 opt = video_options[i];
1596 if (!strncmp(name, opt, name_len) &&
1597 opt[name_len] == ':')
1598 options = opt + name_len + 1;
1599 }
1600 }
1601 if (options && !strncmp(options, "off", 3))
1602 retval = 1;
1603
1604 if (option)
1605 *option = options;
1606
1607 return retval;
1608 }
1609
1610 #ifndef MODULE
1611 /**
1612 * video_setup - process command line options
1613 * @options: string of options
1614 *
1615 * Process command line options for frame buffer subsystem.
1616 *
1617 * NOTE: This function is a __setup and __init function.
1618 * It only stores the options. Drivers have to call
1619 * fb_get_options() as necessary.
1620 *
1621 * Returns zero.
1622 *
1623 */
1624 static int __init video_setup(char *options)
1625 {
1626 int i, global = 0;
1627
1628 if (!options || !*options)
1629 global = 1;
1630
1631 if (!global && !strncmp(options, "ofonly", 6)) {
1632 ofonly = 1;
1633 global = 1;
1634 }
1635
1636 if (!global && !strstr(options, "fb:")) {
1637 fb_mode_option = options;
1638 global = 1;
1639 }
1640
1641 if (!global) {
1642 for (i = 0; i < FB_MAX; i++) {
1643 if (video_options[i] == NULL) {
1644 video_options[i] = options;
1645 break;
1646 }
1647
1648 }
1649 }
1650
1651 return 1;
1652 }
1653 __setup("video=", video_setup);
1654 #endif
1655
1656 /*
1657 * Visible symbols for modules
1658 */
1659
1660 EXPORT_SYMBOL(register_framebuffer);
1661 EXPORT_SYMBOL(unregister_framebuffer);
1662 EXPORT_SYMBOL(num_registered_fb);
1663 EXPORT_SYMBOL(registered_fb);
1664 EXPORT_SYMBOL(fb_show_logo);
1665 EXPORT_SYMBOL(fb_set_var);
1666 EXPORT_SYMBOL(fb_blank);
1667 EXPORT_SYMBOL(fb_pan_display);
1668 EXPORT_SYMBOL(fb_get_buffer_offset);
1669 EXPORT_SYMBOL(fb_set_suspend);
1670 EXPORT_SYMBOL(fb_get_options);
1671
1672 MODULE_LICENSE("GPL");
WRT350N Kernel Patches