projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
atmel_lcdfb: avoid division by zero
[deliverable/linux.git] / drivers / video / fbmem.c
1 /*
2 * linux/drivers/video/fbmem.c
3 *
4 * Copyright (C) 1994 Martin Schaller
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive
11 * for more details.
12 */
13
14 #include <linux/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/seq_file.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 #include <linux/fb.h>
38
39 #include <asm/fb.h>
40
41
42 /*
43 * Frame buffer device initialization and setup routines
44 */
45
46 #define FBPIXMAPSIZE (1024 * 8)
47
48 struct fb_info *registered_fb[FB_MAX] __read_mostly;
49 int num_registered_fb __read_mostly;
50
51 /*
52 * Helpers
53 */
54
55 int fb_get_color_depth(struct fb_var_screeninfo *var,
56 struct fb_fix_screeninfo *fix)
57 {
58 int depth = 0;
59
60 if (fix->visual == FB_VISUAL_MONO01 ||
61 fix->visual == FB_VISUAL_MONO10)
62 depth = 1;
63 else {
64 if (var->green.length == var->blue.length &&
65 var->green.length == var->red.length &&
66 var->green.offset == var->blue.offset &&
67 var->green.offset == var->red.offset)
68 depth = var->green.length;
69 else
70 depth = var->green.length + var->red.length +
71 var->blue.length;
72 }
73
74 return depth;
75 }
76 EXPORT_SYMBOL(fb_get_color_depth);
77
78 /*
79 * Data padding functions.
80 */
81 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
82 {
83 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
84 }
85 EXPORT_SYMBOL(fb_pad_aligned_buffer);
86
87 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
88 u32 shift_high, u32 shift_low, u32 mod)
89 {
90 u8 mask = (u8) (0xfff << shift_high), tmp;
91 int i, j;
92
93 for (i = height; i--; ) {
94 for (j = 0; j < idx; j++) {
95 tmp = dst[j];
96 tmp &= mask;
97 tmp |= *src >> shift_low;
98 dst[j] = tmp;
99 tmp = *src << shift_high;
100 dst[j+1] = tmp;
101 src++;
102 }
103 tmp = dst[idx];
104 tmp &= mask;
105 tmp |= *src >> shift_low;
106 dst[idx] = tmp;
107 if (shift_high < mod) {
108 tmp = *src << shift_high;
109 dst[idx+1] = tmp;
110 }
111 src++;
112 dst += d_pitch;
113 }
114 }
115 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
116
117 /*
118 * we need to lock this section since fb_cursor
119 * may use fb_imageblit()
120 */
121 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
122 {
123 u32 align = buf->buf_align - 1, offset;
124 char *addr = buf->addr;
125
126 /* If IO mapped, we need to sync before access, no sharing of
127 * the pixmap is done
128 */
129 if (buf->flags & FB_PIXMAP_IO) {
130 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
131 info->fbops->fb_sync(info);
132 return addr;
133 }
134
135 /* See if we fit in the remaining pixmap space */
136 offset = buf->offset + align;
137 offset &= ~align;
138 if (offset + size > buf->size) {
139 /* We do not fit. In order to be able to re-use the buffer,
140 * we must ensure no asynchronous DMA'ing or whatever operation
141 * is in progress, we sync for that.
142 */
143 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
144 info->fbops->fb_sync(info);
145 offset = 0;
146 }
147 buf->offset = offset + size;
148 addr += offset;
149
150 return addr;
151 }
152
153 #ifdef CONFIG_LOGO
154
155 static inline unsigned safe_shift(unsigned d, int n)
156 {
157 return n < 0 ? d >> -n : d << n;
158 }
159
160 static void fb_set_logocmap(struct fb_info *info,
161 const struct linux_logo *logo)
162 {
163 struct fb_cmap palette_cmap;
164 u16 palette_green[16];
165 u16 palette_blue[16];
166 u16 palette_red[16];
167 int i, j, n;
168 const unsigned char *clut = logo->clut;
169
170 palette_cmap.start = 0;
171 palette_cmap.len = 16;
172 palette_cmap.red = palette_red;
173 palette_cmap.green = palette_green;
174 palette_cmap.blue = palette_blue;
175 palette_cmap.transp = NULL;
176
177 for (i = 0; i < logo->clutsize; i += n) {
178 n = logo->clutsize - i;
179 /* palette_cmap provides space for only 16 colors at once */
180 if (n > 16)
181 n = 16;
182 palette_cmap.start = 32 + i;
183 palette_cmap.len = n;
184 for (j = 0; j < n; ++j) {
185 palette_cmap.red[j] = clut[0] << 8 | clut[0];
186 palette_cmap.green[j] = clut[1] << 8 | clut[1];
187 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
188 clut += 3;
189 }
190 fb_set_cmap(&palette_cmap, info);
191 }
192 }
193
194 static void fb_set_logo_truepalette(struct fb_info *info,
195 const struct linux_logo *logo,
196 u32 *palette)
197 {
198 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
199 unsigned char redmask, greenmask, bluemask;
200 int redshift, greenshift, blueshift;
201 int i;
202 const unsigned char *clut = logo->clut;
203
204 /*
205 * We have to create a temporary palette since console palette is only
206 * 16 colors long.
207 */
208 /* Bug: Doesn't obey msb_right ... (who needs that?) */
209 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
210 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
211 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
212 redshift = info->var.red.offset - (8 - info->var.red.length);
213 greenshift = info->var.green.offset - (8 - info->var.green.length);
214 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
215
216 for ( i = 0; i < logo->clutsize; i++) {
217 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
218 safe_shift((clut[1] & greenmask), greenshift) |
219 safe_shift((clut[2] & bluemask), blueshift));
220 clut += 3;
221 }
222 }
223
224 static void fb_set_logo_directpalette(struct fb_info *info,
225 const struct linux_logo *logo,
226 u32 *palette)
227 {
228 int redshift, greenshift, blueshift;
229 int i;
230
231 redshift = info->var.red.offset;
232 greenshift = info->var.green.offset;
233 blueshift = info->var.blue.offset;
234
235 for (i = 32; i < logo->clutsize; i++)
236 palette[i] = i << redshift | i << greenshift | i << blueshift;
237 }
238
239 static void fb_set_logo(struct fb_info *info,
240 const struct linux_logo *logo, u8 *dst,
241 int depth)
242 {
243 int i, j, k;
244 const u8 *src = logo->data;
245 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
246 u8 fg = 1, d;
247
248 switch (fb_get_color_depth(&info->var, &info->fix)) {
249 case 1:
250 fg = 1;
251 break;
252 case 2:
253 fg = 3;
254 break;
255 default:
256 fg = 7;
257 break;
258 }
259
260 if (info->fix.visual == FB_VISUAL_MONO01 ||
261 info->fix.visual == FB_VISUAL_MONO10)
262 fg = ~((u8) (0xfff << info->var.green.length));
263
264 switch (depth) {
265 case 4:
266 for (i = 0; i < logo->height; i++)
267 for (j = 0; j < logo->width; src++) {
268 *dst++ = *src >> 4;
269 j++;
270 if (j < logo->width) {
271 *dst++ = *src & 0x0f;
272 j++;
273 }
274 }
275 break;
276 case 1:
277 for (i = 0; i < logo->height; i++) {
278 for (j = 0; j < logo->width; src++) {
279 d = *src ^ xor;
280 for (k = 7; k >= 0; k--) {
281 *dst++ = ((d >> k) & 1) ? fg : 0;
282 j++;
283 }
284 }
285 }
286 break;
287 }
288 }
289
290 /*
291 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
292 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
293 * the visual format and color depth of the framebuffer, the DAC, the
294 * pseudo_palette, and the logo data will be adjusted accordingly.
295 *
296 * Case 1 - linux_logo_clut224:
297 * Color exceeds the number of console colors (16), thus we set the hardware DAC
298 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
299 *
300 * For visuals that require color info from the pseudo_palette, we also construct
301 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
302 * will be set.
303 *
304 * Case 2 - linux_logo_vga16:
305 * The number of colors just matches the console colors, thus there is no need
306 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
307 * each byte contains color information for two pixels (upper and lower nibble).
308 * To be consistent with fb_imageblit() usage, we therefore separate the two
309 * nibbles into separate bytes. The "depth" flag will be set to 4.
310 *
311 * Case 3 - linux_logo_mono:
312 * This is similar with Case 2. Each byte contains information for 8 pixels.
313 * We isolate each bit and expand each into a byte. The "depth" flag will
314 * be set to 1.
315 */
316 static struct logo_data {
317 int depth;
318 int needs_directpalette;
319 int needs_truepalette;
320 int needs_cmapreset;
321 const struct linux_logo *logo;
322 } fb_logo __read_mostly;
323
324 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
325 {
326 u32 size = width * height, i;
327
328 out += size - 1;
329
330 for (i = size; i--; )
331 *out-- = *in++;
332 }
333
334 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
335 {
336 int i, j, h = height - 1;
337
338 for (i = 0; i < height; i++)
339 for (j = 0; j < width; j++)
340 out[height * j + h - i] = *in++;
341 }
342
343 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
344 {
345 int i, j, w = width - 1;
346
347 for (i = 0; i < height; i++)
348 for (j = 0; j < width; j++)
349 out[height * (w - j) + i] = *in++;
350 }
351
352 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
353 struct fb_image *image, int rotate)
354 {
355 u32 tmp;
356
357 if (rotate == FB_ROTATE_UD) {
358 fb_rotate_logo_ud(image->data, dst, image->width,
359 image->height);
360 image->dx = info->var.xres - image->width - image->dx;
361 image->dy = info->var.yres - image->height - image->dy;
362 } else if (rotate == FB_ROTATE_CW) {
363 fb_rotate_logo_cw(image->data, dst, image->width,
364 image->height);
365 tmp = image->width;
366 image->width = image->height;
367 image->height = tmp;
368 tmp = image->dy;
369 image->dy = image->dx;
370 image->dx = info->var.xres - image->width - tmp;
371 } else if (rotate == FB_ROTATE_CCW) {
372 fb_rotate_logo_ccw(image->data, dst, image->width,
373 image->height);
374 tmp = image->width;
375 image->width = image->height;
376 image->height = tmp;
377 tmp = image->dx;
378 image->dx = image->dy;
379 image->dy = info->var.yres - image->height - tmp;
380 }
381
382 image->data = dst;
383 }
384
385 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
386 int rotate, unsigned int num)
387 {
388 unsigned int x;
389
390 if (rotate == FB_ROTATE_UR) {
391 for (x = 0;
392 x < num && image->dx + image->width <= info->var.xres;
393 x++) {
394 info->fbops->fb_imageblit(info, image);
395 image->dx += image->width + 8;
396 }
397 } else if (rotate == FB_ROTATE_UD) {
398 for (x = 0; x < num && image->dx >= 0; x++) {
399 info->fbops->fb_imageblit(info, image);
400 image->dx -= image->width + 8;
401 }
402 } else if (rotate == FB_ROTATE_CW) {
403 for (x = 0;
404 x < num && image->dy + image->height <= info->var.yres;
405 x++) {
406 info->fbops->fb_imageblit(info, image);
407 image->dy += image->height + 8;
408 }
409 } else if (rotate == FB_ROTATE_CCW) {
410 for (x = 0; x < num && image->dy >= 0; x++) {
411 info->fbops->fb_imageblit(info, image);
412 image->dy -= image->height + 8;
413 }
414 }
415 }
416
417 static int fb_show_logo_line(struct fb_info *info, int rotate,
418 const struct linux_logo *logo, int y,
419 unsigned int n)
420 {
421 u32 *palette = NULL, *saved_pseudo_palette = NULL;
422 unsigned char *logo_new = NULL, *logo_rotate = NULL;
423 struct fb_image image;
424
425 /* Return if the frame buffer is not mapped or suspended */
426 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
427 info->flags & FBINFO_MODULE)
428 return 0;
429
430 image.depth = 8;
431 image.data = logo->data;
432
433 if (fb_logo.needs_cmapreset)
434 fb_set_logocmap(info, logo);
435
436 if (fb_logo.needs_truepalette ||
437 fb_logo.needs_directpalette) {
438 palette = kmalloc(256 * 4, GFP_KERNEL);
439 if (palette == NULL)
440 return 0;
441
442 if (fb_logo.needs_truepalette)
443 fb_set_logo_truepalette(info, logo, palette);
444 else
445 fb_set_logo_directpalette(info, logo, palette);
446
447 saved_pseudo_palette = info->pseudo_palette;
448 info->pseudo_palette = palette;
449 }
450
451 if (fb_logo.depth <= 4) {
452 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
453 if (logo_new == NULL) {
454 kfree(palette);
455 if (saved_pseudo_palette)
456 info->pseudo_palette = saved_pseudo_palette;
457 return 0;
458 }
459 image.data = logo_new;
460 fb_set_logo(info, logo, logo_new, fb_logo.depth);
461 }
462
463 image.dx = 0;
464 image.dy = y;
465 image.width = logo->width;
466 image.height = logo->height;
467
468 if (rotate) {
469 logo_rotate = kmalloc(logo->width *
470 logo->height, GFP_KERNEL);
471 if (logo_rotate)
472 fb_rotate_logo(info, logo_rotate, &image, rotate);
473 }
474
475 fb_do_show_logo(info, &image, rotate, n);
476
477 kfree(palette);
478 if (saved_pseudo_palette != NULL)
479 info->pseudo_palette = saved_pseudo_palette;
480 kfree(logo_new);
481 kfree(logo_rotate);
482 return logo->height;
483 }
484
485
486 #ifdef CONFIG_FB_LOGO_EXTRA
487
488 #define FB_LOGO_EX_NUM_MAX 10
489 static struct logo_data_extra {
490 const struct linux_logo *logo;
491 unsigned int n;
492 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
493 static unsigned int fb_logo_ex_num;
494
495 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
496 {
497 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
498 return;
499
500 fb_logo_ex[fb_logo_ex_num].logo = logo;
501 fb_logo_ex[fb_logo_ex_num].n = n;
502 fb_logo_ex_num++;
503 }
504
505 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
506 unsigned int yres)
507 {
508 unsigned int i;
509
510 /* FIXME: logo_ex supports only truecolor fb. */
511 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
512 fb_logo_ex_num = 0;
513
514 for (i = 0; i < fb_logo_ex_num; i++) {
515 height += fb_logo_ex[i].logo->height;
516 if (height > yres) {
517 height -= fb_logo_ex[i].logo->height;
518 fb_logo_ex_num = i;
519 break;
520 }
521 }
522 return height;
523 }
524
525 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
526 {
527 unsigned int i;
528
529 for (i = 0; i < fb_logo_ex_num; i++)
530 y += fb_show_logo_line(info, rotate,
531 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
532
533 return y;
534 }
535
536 #else /* !CONFIG_FB_LOGO_EXTRA */
537
538 static inline int fb_prepare_extra_logos(struct fb_info *info,
539 unsigned int height,
540 unsigned int yres)
541 {
542 return height;
543 }
544
545 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
546 {
547 return y;
548 }
549
550 #endif /* CONFIG_FB_LOGO_EXTRA */
551
552
553 int fb_prepare_logo(struct fb_info *info, int rotate)
554 {
555 int depth = fb_get_color_depth(&info->var, &info->fix);
556 unsigned int yres;
557
558 memset(&fb_logo, 0, sizeof(struct logo_data));
559
560 if (info->flags & FBINFO_MISC_TILEBLITTING ||
561 info->flags & FBINFO_MODULE)
562 return 0;
563
564 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
565 depth = info->var.blue.length;
566 if (info->var.red.length < depth)
567 depth = info->var.red.length;
568 if (info->var.green.length < depth)
569 depth = info->var.green.length;
570 }
571
572 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
573 /* assume console colormap */
574 depth = 4;
575 }
576
577 /* Return if no suitable logo was found */
578 fb_logo.logo = fb_find_logo(depth);
579
580 if (!fb_logo.logo) {
581 return 0;
582 }
583
584 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
585 yres = info->var.yres;
586 else
587 yres = info->var.xres;
588
589 if (fb_logo.logo->height > yres) {
590 fb_logo.logo = NULL;
591 return 0;
592 }
593
594 /* What depth we asked for might be different from what we get */
595 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
596 fb_logo.depth = 8;
597 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
598 fb_logo.depth = 4;
599 else
600 fb_logo.depth = 1;
601
602
603 if (fb_logo.depth > 4 && depth > 4) {
604 switch (info->fix.visual) {
605 case FB_VISUAL_TRUECOLOR:
606 fb_logo.needs_truepalette = 1;
607 break;
608 case FB_VISUAL_DIRECTCOLOR:
609 fb_logo.needs_directpalette = 1;
610 fb_logo.needs_cmapreset = 1;
611 break;
612 case FB_VISUAL_PSEUDOCOLOR:
613 fb_logo.needs_cmapreset = 1;
614 break;
615 }
616 }
617
618 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
619 }
620
621 int fb_show_logo(struct fb_info *info, int rotate)
622 {
623 int y;
624
625 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
626 num_online_cpus());
627 y = fb_show_extra_logos(info, y, rotate);
628
629 return y;
630 }
631 #else
632 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
633 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
634 #endif /* CONFIG_LOGO */
635
636 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
637 {
638 return (*pos < FB_MAX) ? pos : NULL;
639 }
640
641 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
642 {
643 (*pos)++;
644 return (*pos < FB_MAX) ? pos : NULL;
645 }
646
647 static void fb_seq_stop(struct seq_file *m, void *v)
648 {
649 }
650
651 static int fb_seq_show(struct seq_file *m, void *v)
652 {
653 int i = *(loff_t *)v;
654 struct fb_info *fi = registered_fb[i];
655
656 if (fi)
657 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
658 return 0;
659 }
660
661 static const struct seq_operations proc_fb_seq_ops = {
662 .start = fb_seq_start,
663 .next = fb_seq_next,
664 .stop = fb_seq_stop,
665 .show = fb_seq_show,
666 };
667
668 static int proc_fb_open(struct inode *inode, struct file *file)
669 {
670 return seq_open(file, &proc_fb_seq_ops);
671 }
672
673 static const struct file_operations fb_proc_fops = {
674 .owner = THIS_MODULE,
675 .open = proc_fb_open,
676 .read = seq_read,
677 .llseek = seq_lseek,
678 .release = seq_release,
679 };
680
681 static ssize_t
682 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
683 {
684 unsigned long p = *ppos;
685 struct inode *inode = file->f_path.dentry->d_inode;
686 int fbidx = iminor(inode);
687 struct fb_info *info = registered_fb[fbidx];
688 u32 *buffer, *dst;
689 u32 __iomem *src;
690 int c, i, cnt = 0, err = 0;
691 unsigned long total_size;
692
693 if (!info || ! info->screen_base)
694 return -ENODEV;
695
696 if (info->state != FBINFO_STATE_RUNNING)
697 return -EPERM;
698
699 if (info->fbops->fb_read)
700 return info->fbops->fb_read(info, buf, count, ppos);
701
702 total_size = info->screen_size;
703
704 if (total_size == 0)
705 total_size = info->fix.smem_len;
706
707 if (p >= total_size)
708 return 0;
709
710 if (count >= total_size)
711 count = total_size;
712
713 if (count + p > total_size)
714 count = total_size - p;
715
716 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
717 GFP_KERNEL);
718 if (!buffer)
719 return -ENOMEM;
720
721 src = (u32 __iomem *) (info->screen_base + p);
722
723 if (info->fbops->fb_sync)
724 info->fbops->fb_sync(info);
725
726 while (count) {
727 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
728 dst = buffer;
729 for (i = c >> 2; i--; )
730 *dst++ = fb_readl(src++);
731 if (c & 3) {
732 u8 *dst8 = (u8 *) dst;
733 u8 __iomem *src8 = (u8 __iomem *) src;
734
735 for (i = c & 3; i--;)
736 *dst8++ = fb_readb(src8++);
737
738 src = (u32 __iomem *) src8;
739 }
740
741 if (copy_to_user(buf, buffer, c)) {
742 err = -EFAULT;
743 break;
744 }
745 *ppos += c;
746 buf += c;
747 cnt += c;
748 count -= c;
749 }
750
751 kfree(buffer);
752
753 return (err) ? err : cnt;
754 }
755
756 static ssize_t
757 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
758 {
759 unsigned long p = *ppos;
760 struct inode *inode = file->f_path.dentry->d_inode;
761 int fbidx = iminor(inode);
762 struct fb_info *info = registered_fb[fbidx];
763 u32 *buffer, *src;
764 u32 __iomem *dst;
765 int c, i, cnt = 0, err = 0;
766 unsigned long total_size;
767
768 if (!info || !info->screen_base)
769 return -ENODEV;
770
771 if (info->state != FBINFO_STATE_RUNNING)
772 return -EPERM;
773
774 if (info->fbops->fb_write)
775 return info->fbops->fb_write(info, buf, count, ppos);
776
777 total_size = info->screen_size;
778
779 if (total_size == 0)
780 total_size = info->fix.smem_len;
781
782 if (p > total_size)
783 return -EFBIG;
784
785 if (count > total_size) {
786 err = -EFBIG;
787 count = total_size;
788 }
789
790 if (count + p > total_size) {
791 if (!err)
792 err = -ENOSPC;
793
794 count = total_size - p;
795 }
796
797 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
798 GFP_KERNEL);
799 if (!buffer)
800 return -ENOMEM;
801
802 dst = (u32 __iomem *) (info->screen_base + p);
803
804 if (info->fbops->fb_sync)
805 info->fbops->fb_sync(info);
806
807 while (count) {
808 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
809 src = buffer;
810
811 if (copy_from_user(src, buf, c)) {
812 err = -EFAULT;
813 break;
814 }
815
816 for (i = c >> 2; i--; )
817 fb_writel(*src++, dst++);
818
819 if (c & 3) {
820 u8 *src8 = (u8 *) src;
821 u8 __iomem *dst8 = (u8 __iomem *) dst;
822
823 for (i = c & 3; i--; )
824 fb_writeb(*src8++, dst8++);
825
826 dst = (u32 __iomem *) dst8;
827 }
828
829 *ppos += c;
830 buf += c;
831 cnt += c;
832 count -= c;
833 }
834
835 kfree(buffer);
836
837 return (cnt) ? cnt : err;
838 }
839
840 #ifdef CONFIG_KMOD
841 static void try_to_load(int fb)
842 {
843 request_module("fb%d", fb);
844 }
845 #endif /* CONFIG_KMOD */
846
847 int
848 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
849 {
850 struct fb_fix_screeninfo *fix = &info->fix;
851 unsigned int yres = info->var.yres;
852 int err = 0;
853
854 if (var->yoffset > 0) {
855 if (var->vmode & FB_VMODE_YWRAP) {
856 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
857 err = -EINVAL;
858 else
859 yres = 0;
860 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
861 err = -EINVAL;
862 }
863
864 if (var->xoffset > 0 && (!fix->xpanstep ||
865 (var->xoffset % fix->xpanstep)))
866 err = -EINVAL;
867
868 if (err || !info->fbops->fb_pan_display ||
869 var->yoffset + yres > info->var.yres_virtual ||
870 var->xoffset + info->var.xres > info->var.xres_virtual)
871 return -EINVAL;
872
873 if ((err = info->fbops->fb_pan_display(var, info)))
874 return err;
875 info->var.xoffset = var->xoffset;
876 info->var.yoffset = var->yoffset;
877 if (var->vmode & FB_VMODE_YWRAP)
878 info->var.vmode |= FB_VMODE_YWRAP;
879 else
880 info->var.vmode &= ~FB_VMODE_YWRAP;
881 return 0;
882 }
883
884 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
885 u32 activate)
886 {
887 struct fb_event event;
888 struct fb_blit_caps caps, fbcaps;
889 int err = 0;
890
891 memset(&caps, 0, sizeof(caps));
892 memset(&fbcaps, 0, sizeof(fbcaps));
893 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
894 event.info = info;
895 event.data = &caps;
896 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
897 info->fbops->fb_get_caps(info, &fbcaps, var);
898
899 if (((fbcaps.x ^ caps.x) & caps.x) ||
900 ((fbcaps.y ^ caps.y) & caps.y) ||
901 (fbcaps.len < caps.len))
902 err = -EINVAL;
903
904 return err;
905 }
906
907 int
908 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
909 {
910 int flags = info->flags;
911 int ret = 0;
912
913 if (var->activate & FB_ACTIVATE_INV_MODE) {
914 struct fb_videomode mode1, mode2;
915
916 fb_var_to_videomode(&mode1, var);
917 fb_var_to_videomode(&mode2, &info->var);
918 /* make sure we don't delete the videomode of current var */
919 ret = fb_mode_is_equal(&mode1, &mode2);
920
921 if (!ret) {
922 struct fb_event event;
923
924 event.info = info;
925 event.data = &mode1;
926 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
927 }
928
929 if (!ret)
930 fb_delete_videomode(&mode1, &info->modelist);
931
932
933 ret = (ret) ? -EINVAL : 0;
934 goto done;
935 }
936
937 if ((var->activate & FB_ACTIVATE_FORCE) ||
938 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
939 u32 activate = var->activate;
940
941 if (!info->fbops->fb_check_var) {
942 *var = info->var;
943 goto done;
944 }
945
946 ret = info->fbops->fb_check_var(var, info);
947
948 if (ret)
949 goto done;
950
951 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
952 struct fb_videomode mode;
953
954 if (info->fbops->fb_get_caps) {
955 ret = fb_check_caps(info, var, activate);
956
957 if (ret)
958 goto done;
959 }
960
961 info->var = *var;
962
963 if (info->fbops->fb_set_par)
964 info->fbops->fb_set_par(info);
965
966 fb_pan_display(info, &info->var);
967 fb_set_cmap(&info->cmap, info);
968 fb_var_to_videomode(&mode, &info->var);
969
970 if (info->modelist.prev && info->modelist.next &&
971 !list_empty(&info->modelist))
972 ret = fb_add_videomode(&mode, &info->modelist);
973
974 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
975 struct fb_event event;
976 int evnt = (activate & FB_ACTIVATE_ALL) ?
977 FB_EVENT_MODE_CHANGE_ALL :
978 FB_EVENT_MODE_CHANGE;
979
980 info->flags &= ~FBINFO_MISC_USEREVENT;
981 event.info = info;
982 fb_notifier_call_chain(evnt, &event);
983 }
984 }
985 }
986
987 done:
988 return ret;
989 }
990
991 int
992 fb_blank(struct fb_info *info, int blank)
993 {
994 int ret = -EINVAL;
995
996 if (blank > FB_BLANK_POWERDOWN)
997 blank = FB_BLANK_POWERDOWN;
998
999 if (info->fbops->fb_blank)
1000 ret = info->fbops->fb_blank(blank, info);
1001
1002 if (!ret) {
1003 struct fb_event event;
1004
1005 event.info = info;
1006 event.data = &blank;
1007 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1008 }
1009
1010 return ret;
1011 }
1012
1013 static int
1014 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1015 unsigned long arg)
1016 {
1017 int fbidx = iminor(inode);
1018 struct fb_info *info = registered_fb[fbidx];
1019 struct fb_ops *fb = info->fbops;
1020 struct fb_var_screeninfo var;
1021 struct fb_fix_screeninfo fix;
1022 struct fb_con2fbmap con2fb;
1023 struct fb_cmap_user cmap;
1024 struct fb_event event;
1025 void __user *argp = (void __user *)arg;
1026 int i;
1027
1028 if (!fb)
1029 return -ENODEV;
1030 switch (cmd) {
1031 case FBIOGET_VSCREENINFO:
1032 return copy_to_user(argp, &info->var,
1033 sizeof(var)) ? -EFAULT : 0;
1034 case FBIOPUT_VSCREENINFO:
1035 if (copy_from_user(&var, argp, sizeof(var)))
1036 return -EFAULT;
1037 acquire_console_sem();
1038 info->flags |= FBINFO_MISC_USEREVENT;
1039 i = fb_set_var(info, &var);
1040 info->flags &= ~FBINFO_MISC_USEREVENT;
1041 release_console_sem();
1042 if (i) return i;
1043 if (copy_to_user(argp, &var, sizeof(var)))
1044 return -EFAULT;
1045 return 0;
1046 case FBIOGET_FSCREENINFO:
1047 return copy_to_user(argp, &info->fix,
1048 sizeof(fix)) ? -EFAULT : 0;
1049 case FBIOPUTCMAP:
1050 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1051 return -EFAULT;
1052 return (fb_set_user_cmap(&cmap, info));
1053 case FBIOGETCMAP:
1054 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1055 return -EFAULT;
1056 return fb_cmap_to_user(&info->cmap, &cmap);
1057 case FBIOPAN_DISPLAY:
1058 if (copy_from_user(&var, argp, sizeof(var)))
1059 return -EFAULT;
1060 acquire_console_sem();
1061 i = fb_pan_display(info, &var);
1062 release_console_sem();
1063 if (i)
1064 return i;
1065 if (copy_to_user(argp, &var, sizeof(var)))
1066 return -EFAULT;
1067 return 0;
1068 case FBIO_CURSOR:
1069 return -EINVAL;
1070 case FBIOGET_CON2FBMAP:
1071 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1072 return -EFAULT;
1073 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1074 return -EINVAL;
1075 con2fb.framebuffer = -1;
1076 event.info = info;
1077 event.data = &con2fb;
1078 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1079 return copy_to_user(argp, &con2fb,
1080 sizeof(con2fb)) ? -EFAULT : 0;
1081 case FBIOPUT_CON2FBMAP:
1082 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1083 return - EFAULT;
1084 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1085 return -EINVAL;
1086 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1087 return -EINVAL;
1088 #ifdef CONFIG_KMOD
1089 if (!registered_fb[con2fb.framebuffer])
1090 try_to_load(con2fb.framebuffer);
1091 #endif /* CONFIG_KMOD */
1092 if (!registered_fb[con2fb.framebuffer])
1093 return -EINVAL;
1094 event.info = info;
1095 event.data = &con2fb;
1096 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1097 &event);
1098 case FBIOBLANK:
1099 acquire_console_sem();
1100 info->flags |= FBINFO_MISC_USEREVENT;
1101 i = fb_blank(info, arg);
1102 info->flags &= ~FBINFO_MISC_USEREVENT;
1103 release_console_sem();
1104 return i;
1105 default:
1106 if (fb->fb_ioctl == NULL)
1107 return -EINVAL;
1108 return fb->fb_ioctl(info, cmd, arg);
1109 }
1110 }
1111
1112 #ifdef CONFIG_COMPAT
1113 struct fb_fix_screeninfo32 {
1114 char id[16];
1115 compat_caddr_t smem_start;
1116 u32 smem_len;
1117 u32 type;
1118 u32 type_aux;
1119 u32 visual;
1120 u16 xpanstep;
1121 u16 ypanstep;
1122 u16 ywrapstep;
1123 u32 line_length;
1124 compat_caddr_t mmio_start;
1125 u32 mmio_len;
1126 u32 accel;
1127 u16 reserved[3];
1128 };
1129
1130 struct fb_cmap32 {
1131 u32 start;
1132 u32 len;
1133 compat_caddr_t red;
1134 compat_caddr_t green;
1135 compat_caddr_t blue;
1136 compat_caddr_t transp;
1137 };
1138
1139 static int fb_getput_cmap(struct inode *inode, struct file *file,
1140 unsigned int cmd, unsigned long arg)
1141 {
1142 struct fb_cmap_user __user *cmap;
1143 struct fb_cmap32 __user *cmap32;
1144 __u32 data;
1145 int err;
1146
1147 cmap = compat_alloc_user_space(sizeof(*cmap));
1148 cmap32 = compat_ptr(arg);
1149
1150 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1151 return -EFAULT;
1152
1153 if (get_user(data, &cmap32->red) ||
1154 put_user(compat_ptr(data), &cmap->red) ||
1155 get_user(data, &cmap32->green) ||
1156 put_user(compat_ptr(data), &cmap->green) ||
1157 get_user(data, &cmap32->blue) ||
1158 put_user(compat_ptr(data), &cmap->blue) ||
1159 get_user(data, &cmap32->transp) ||
1160 put_user(compat_ptr(data), &cmap->transp))
1161 return -EFAULT;
1162
1163 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1164
1165 if (!err) {
1166 if (copy_in_user(&cmap32->start,
1167 &cmap->start,
1168 2 * sizeof(__u32)))
1169 err = -EFAULT;
1170 }
1171 return err;
1172 }
1173
1174 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1175 struct fb_fix_screeninfo32 __user *fix32)
1176 {
1177 __u32 data;
1178 int err;
1179
1180 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1181
1182 data = (__u32) (unsigned long) fix->smem_start;
1183 err |= put_user(data, &fix32->smem_start);
1184
1185 err |= put_user(fix->smem_len, &fix32->smem_len);
1186 err |= put_user(fix->type, &fix32->type);
1187 err |= put_user(fix->type_aux, &fix32->type_aux);
1188 err |= put_user(fix->visual, &fix32->visual);
1189 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1190 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1191 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1192 err |= put_user(fix->line_length, &fix32->line_length);
1193
1194 data = (__u32) (unsigned long) fix->mmio_start;
1195 err |= put_user(data, &fix32->mmio_start);
1196
1197 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1198 err |= put_user(fix->accel, &fix32->accel);
1199 err |= copy_to_user(fix32->reserved, fix->reserved,
1200 sizeof(fix->reserved));
1201
1202 return err;
1203 }
1204
1205 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1206 unsigned int cmd, unsigned long arg)
1207 {
1208 mm_segment_t old_fs;
1209 struct fb_fix_screeninfo fix;
1210 struct fb_fix_screeninfo32 __user *fix32;
1211 int err;
1212
1213 fix32 = compat_ptr(arg);
1214
1215 old_fs = get_fs();
1216 set_fs(KERNEL_DS);
1217 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1218 set_fs(old_fs);
1219
1220 if (!err)
1221 err = do_fscreeninfo_to_user(&fix, fix32);
1222
1223 return err;
1224 }
1225
1226 static long
1227 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1228 {
1229 struct inode *inode = file->f_path.dentry->d_inode;
1230 int fbidx = iminor(inode);
1231 struct fb_info *info = registered_fb[fbidx];
1232 struct fb_ops *fb = info->fbops;
1233 long ret = -ENOIOCTLCMD;
1234
1235 lock_kernel();
1236 switch(cmd) {
1237 case FBIOGET_VSCREENINFO:
1238 case FBIOPUT_VSCREENINFO:
1239 case FBIOPAN_DISPLAY:
1240 case FBIOGET_CON2FBMAP:
1241 case FBIOPUT_CON2FBMAP:
1242 arg = (unsigned long) compat_ptr(arg);
1243 case FBIOBLANK:
1244 ret = fb_ioctl(inode, file, cmd, arg);
1245 break;
1246
1247 case FBIOGET_FSCREENINFO:
1248 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1249 break;
1250
1251 case FBIOGETCMAP:
1252 case FBIOPUTCMAP:
1253 ret = fb_getput_cmap(inode, file, cmd, arg);
1254 break;
1255
1256 default:
1257 if (fb->fb_compat_ioctl)
1258 ret = fb->fb_compat_ioctl(info, cmd, arg);
1259 break;
1260 }
1261 unlock_kernel();
1262 return ret;
1263 }
1264 #endif
1265
1266 static int
1267 fb_mmap(struct file *file, struct vm_area_struct * vma)
1268 {
1269 int fbidx = iminor(file->f_path.dentry->d_inode);
1270 struct fb_info *info = registered_fb[fbidx];
1271 struct fb_ops *fb = info->fbops;
1272 unsigned long off;
1273 unsigned long start;
1274 u32 len;
1275
1276 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1277 return -EINVAL;
1278 off = vma->vm_pgoff << PAGE_SHIFT;
1279 if (!fb)
1280 return -ENODEV;
1281 if (fb->fb_mmap) {
1282 int res;
1283 lock_kernel();
1284 res = fb->fb_mmap(info, vma);
1285 unlock_kernel();
1286 return res;
1287 }
1288
1289 lock_kernel();
1290
1291 /* frame buffer memory */
1292 start = info->fix.smem_start;
1293 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1294 if (off >= len) {
1295 /* memory mapped io */
1296 off -= len;
1297 if (info->var.accel_flags) {
1298 unlock_kernel();
1299 return -EINVAL;
1300 }
1301 start = info->fix.mmio_start;
1302 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1303 }
1304 unlock_kernel();
1305 start &= PAGE_MASK;
1306 if ((vma->vm_end - vma->vm_start + off) > len)
1307 return -EINVAL;
1308 off += start;
1309 vma->vm_pgoff = off >> PAGE_SHIFT;
1310 /* This is an IO map - tell maydump to skip this VMA */
1311 vma->vm_flags |= VM_IO | VM_RESERVED;
1312 fb_pgprotect(file, vma, off);
1313 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1314 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1315 return -EAGAIN;
1316 return 0;
1317 }
1318
1319 static int
1320 fb_open(struct inode *inode, struct file *file)
1321 {
1322 int fbidx = iminor(inode);
1323 struct fb_info *info;
1324 int res = 0;
1325
1326 if (fbidx >= FB_MAX)
1327 return -ENODEV;
1328 lock_kernel();
1329 #ifdef CONFIG_KMOD
1330 if (!(info = registered_fb[fbidx]))
1331 try_to_load(fbidx);
1332 #endif /* CONFIG_KMOD */
1333 if (!(info = registered_fb[fbidx])) {
1334 res = -ENODEV;
1335 goto out;
1336 }
1337 if (!try_module_get(info->fbops->owner)) {
1338 res = -ENODEV;
1339 goto out;
1340 }
1341 file->private_data = info;
1342 if (info->fbops->fb_open) {
1343 res = info->fbops->fb_open(info,1);
1344 if (res)
1345 module_put(info->fbops->owner);
1346 }
1347 out:
1348 unlock_kernel();
1349 return res;
1350 }
1351
1352 static int
1353 fb_release(struct inode *inode, struct file *file)
1354 {
1355 struct fb_info * const info = file->private_data;
1356
1357 lock_kernel();
1358 if (info->fbops->fb_release)
1359 info->fbops->fb_release(info,1);
1360 module_put(info->fbops->owner);
1361 unlock_kernel();
1362 return 0;
1363 }
1364
1365 static const struct file_operations fb_fops = {
1366 .owner = THIS_MODULE,
1367 .read = fb_read,
1368 .write = fb_write,
1369 .ioctl = fb_ioctl,
1370 #ifdef CONFIG_COMPAT
1371 .compat_ioctl = fb_compat_ioctl,
1372 #endif
1373 .mmap = fb_mmap,
1374 .open = fb_open,
1375 .release = fb_release,
1376 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1377 .get_unmapped_area = get_fb_unmapped_area,
1378 #endif
1379 #ifdef CONFIG_FB_DEFERRED_IO
1380 .fsync = fb_deferred_io_fsync,
1381 #endif
1382 };
1383
1384 struct class *fb_class;
1385 EXPORT_SYMBOL(fb_class);
1386
1387 static int fb_check_foreignness(struct fb_info *fi)
1388 {
1389 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1390
1391 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1392
1393 #ifdef __BIG_ENDIAN
1394 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1395 #else
1396 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1397 #endif /* __BIG_ENDIAN */
1398
1399 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1400 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1401 "support this framebuffer\n", fi->fix.id);
1402 return -ENOSYS;
1403 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1404 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1405 "support this framebuffer\n", fi->fix.id);
1406 return -ENOSYS;
1407 }
1408
1409 return 0;
1410 }
1411
1412 /**
1413 * register_framebuffer - registers a frame buffer device
1414 * @fb_info: frame buffer info structure
1415 *
1416 * Registers a frame buffer device @fb_info.
1417 *
1418 * Returns negative errno on error, or zero for success.
1419 *
1420 */
1421
1422 int
1423 register_framebuffer(struct fb_info *fb_info)
1424 {
1425 int i;
1426 struct fb_event event;
1427 struct fb_videomode mode;
1428
1429 if (num_registered_fb == FB_MAX)
1430 return -ENXIO;
1431
1432 if (fb_check_foreignness(fb_info))
1433 return -ENOSYS;
1434
1435 num_registered_fb++;
1436 for (i = 0 ; i < FB_MAX; i++)
1437 if (!registered_fb[i])
1438 break;
1439 fb_info->node = i;
1440
1441 fb_info->dev = device_create_drvdata(fb_class, fb_info->device,
1442 MKDEV(FB_MAJOR, i), NULL,
1443 "fb%d", i);
1444 if (IS_ERR(fb_info->dev)) {
1445 /* Not fatal */
1446 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1447 fb_info->dev = NULL;
1448 } else
1449 fb_init_device(fb_info);
1450
1451 if (fb_info->pixmap.addr == NULL) {
1452 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1453 if (fb_info->pixmap.addr) {
1454 fb_info->pixmap.size = FBPIXMAPSIZE;
1455 fb_info->pixmap.buf_align = 1;
1456 fb_info->pixmap.scan_align = 1;
1457 fb_info->pixmap.access_align = 32;
1458 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1459 }
1460 }
1461 fb_info->pixmap.offset = 0;
1462
1463 if (!fb_info->pixmap.blit_x)
1464 fb_info->pixmap.blit_x = ~(u32)0;
1465
1466 if (!fb_info->pixmap.blit_y)
1467 fb_info->pixmap.blit_y = ~(u32)0;
1468
1469 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1470 INIT_LIST_HEAD(&fb_info->modelist);
1471
1472 fb_var_to_videomode(&mode, &fb_info->var);
1473 fb_add_videomode(&mode, &fb_info->modelist);
1474 registered_fb[i] = fb_info;
1475
1476 event.info = fb_info;
1477 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1478 return 0;
1479 }
1480
1481
1482 /**
1483 * unregister_framebuffer - releases a frame buffer device
1484 * @fb_info: frame buffer info structure
1485 *
1486 * Unregisters a frame buffer device @fb_info.
1487 *
1488 * Returns negative errno on error, or zero for success.
1489 *
1490 * This function will also notify the framebuffer console
1491 * to release the driver.
1492 *
1493 * This is meant to be called within a driver's module_exit()
1494 * function. If this is called outside module_exit(), ensure
1495 * that the driver implements fb_open() and fb_release() to
1496 * check that no processes are using the device.
1497 */
1498
1499 int
1500 unregister_framebuffer(struct fb_info *fb_info)
1501 {
1502 struct fb_event event;
1503 int i, ret = 0;
1504
1505 i = fb_info->node;
1506 if (!registered_fb[i]) {
1507 ret = -EINVAL;
1508 goto done;
1509 }
1510
1511 event.info = fb_info;
1512 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1513
1514 if (ret) {
1515 ret = -EINVAL;
1516 goto done;
1517 }
1518
1519 if (fb_info->pixmap.addr &&
1520 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1521 kfree(fb_info->pixmap.addr);
1522 fb_destroy_modelist(&fb_info->modelist);
1523 registered_fb[i]=NULL;
1524 num_registered_fb--;
1525 fb_cleanup_device(fb_info);
1526 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1527 event.info = fb_info;
1528 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1529 done:
1530 return ret;
1531 }
1532
1533 /**
1534 * fb_set_suspend - low level driver signals suspend
1535 * @info: framebuffer affected
1536 * @state: 0 = resuming, !=0 = suspending
1537 *
1538 * This is meant to be used by low level drivers to
1539 * signal suspend/resume to the core & clients.
1540 * It must be called with the console semaphore held
1541 */
1542 void fb_set_suspend(struct fb_info *info, int state)
1543 {
1544 struct fb_event event;
1545
1546 event.info = info;
1547 if (state) {
1548 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1549 info->state = FBINFO_STATE_SUSPENDED;
1550 } else {
1551 info->state = FBINFO_STATE_RUNNING;
1552 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1553 }
1554 }
1555
1556 /**
1557 * fbmem_init - init frame buffer subsystem
1558 *
1559 * Initialize the frame buffer subsystem.
1560 *
1561 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1562 *
1563 */
1564
1565 static int __init
1566 fbmem_init(void)
1567 {
1568 proc_create("fb", 0, NULL, &fb_proc_fops);
1569
1570 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1571 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1572
1573 fb_class = class_create(THIS_MODULE, "graphics");
1574 if (IS_ERR(fb_class)) {
1575 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1576 fb_class = NULL;
1577 }
1578 return 0;
1579 }
1580
1581 #ifdef MODULE
1582 module_init(fbmem_init);
1583 static void __exit
1584 fbmem_exit(void)
1585 {
1586 remove_proc_entry("fb", NULL);
1587 class_destroy(fb_class);
1588 unregister_chrdev(FB_MAJOR, "fb");
1589 }
1590
1591 module_exit(fbmem_exit);
1592 MODULE_LICENSE("GPL");
1593 MODULE_DESCRIPTION("Framebuffer base");
1594 #else
1595 subsys_initcall(fbmem_init);
1596 #endif
1597
1598 int fb_new_modelist(struct fb_info *info)
1599 {
1600 struct fb_event event;
1601 struct fb_var_screeninfo var = info->var;
1602 struct list_head *pos, *n;
1603 struct fb_modelist *modelist;
1604 struct fb_videomode *m, mode;
1605 int err = 1;
1606
1607 list_for_each_safe(pos, n, &info->modelist) {
1608 modelist = list_entry(pos, struct fb_modelist, list);
1609 m = &modelist->mode;
1610 fb_videomode_to_var(&var, m);
1611 var.activate = FB_ACTIVATE_TEST;
1612 err = fb_set_var(info, &var);
1613 fb_var_to_videomode(&mode, &var);
1614 if (err || !fb_mode_is_equal(m, &mode)) {
1615 list_del(pos);
1616 kfree(pos);
1617 }
1618 }
1619
1620 err = 1;
1621
1622 if (!list_empty(&info->modelist)) {
1623 event.info = info;
1624 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1625 }
1626
1627 return err;
1628 }
1629
1630 static char *video_options[FB_MAX] __read_mostly;
1631 static int ofonly __read_mostly;
1632
1633 /**
1634 * fb_get_options - get kernel boot parameters
1635 * @name: framebuffer name as it would appear in
1636 * the boot parameter line
1637 * (video=<name>:<options>)
1638 * @option: the option will be stored here
1639 *
1640 * NOTE: Needed to maintain backwards compatibility
1641 */
1642 int fb_get_options(char *name, char **option)
1643 {
1644 char *opt, *options = NULL;
1645 int opt_len, retval = 0;
1646 int name_len = strlen(name), i;
1647
1648 if (name_len && ofonly && strncmp(name, "offb", 4))
1649 retval = 1;
1650
1651 if (name_len && !retval) {
1652 for (i = 0; i < FB_MAX; i++) {
1653 if (video_options[i] == NULL)
1654 continue;
1655 opt_len = strlen(video_options[i]);
1656 if (!opt_len)
1657 continue;
1658 opt = video_options[i];
1659 if (!strncmp(name, opt, name_len) &&
1660 opt[name_len] == ':')
1661 options = opt + name_len + 1;
1662 }
1663 }
1664 if (options && !strncmp(options, "off", 3))
1665 retval = 1;
1666
1667 if (option)
1668 *option = options;
1669
1670 return retval;
1671 }
1672
1673 #ifndef MODULE
1674 /**
1675 * video_setup - process command line options
1676 * @options: string of options
1677 *
1678 * Process command line options for frame buffer subsystem.
1679 *
1680 * NOTE: This function is a __setup and __init function.
1681 * It only stores the options. Drivers have to call
1682 * fb_get_options() as necessary.
1683 *
1684 * Returns zero.
1685 *
1686 */
1687 static int __init video_setup(char *options)
1688 {
1689 int i, global = 0;
1690
1691 if (!options || !*options)
1692 global = 1;
1693
1694 if (!global && !strncmp(options, "ofonly", 6)) {
1695 ofonly = 1;
1696 global = 1;
1697 }
1698
1699 if (!global && !strstr(options, "fb:")) {
1700 fb_mode_option = options;
1701 global = 1;
1702 }
1703
1704 if (!global) {
1705 for (i = 0; i < FB_MAX; i++) {
1706 if (video_options[i] == NULL) {
1707 video_options[i] = options;
1708 break;
1709 }
1710
1711 }
1712 }
1713
1714 return 1;
1715 }
1716 __setup("video=", video_setup);
1717 #endif
1718
1719 /*
1720 * Visible symbols for modules
1721 */
1722
1723 EXPORT_SYMBOL(register_framebuffer);
1724 EXPORT_SYMBOL(unregister_framebuffer);
1725 EXPORT_SYMBOL(num_registered_fb);
1726 EXPORT_SYMBOL(registered_fb);
1727 EXPORT_SYMBOL(fb_show_logo);
1728 EXPORT_SYMBOL(fb_set_var);
1729 EXPORT_SYMBOL(fb_blank);
1730 EXPORT_SYMBOL(fb_pan_display);
1731 EXPORT_SYMBOL(fb_get_buffer_offset);
1732 EXPORT_SYMBOL(fb_set_suspend);
1733 EXPORT_SYMBOL(fb_get_options);
1734
1735 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.069676 seconds and 5 git commands to generate.