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MMC: S3C24XX: Ensure host->mrq->data is valid
[linux-2.6/zen-sources.git] / drivers / video / fbmem.c
blob33ebdb198dafbf5776ff5a5ac4a39c35fecf1464
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 int xoffset = var->xoffset;
852 int yoffset = var->yoffset;
853 int err = 0, yres = info->var.yres;
854
855 if (var->yoffset > 0) {
856 if (var->vmode & FB_VMODE_YWRAP) {
857 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
858 err = -EINVAL;
859 else
860 yres = 0;
861 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
862 err = -EINVAL;
863 }
864
865 if (var->xoffset > 0 && (!fix->xpanstep ||
866 (var->xoffset % fix->xpanstep)))
867 err = -EINVAL;
868
869 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
870 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
871 var->xoffset + info->var.xres > info->var.xres_virtual)
872 return -EINVAL;
873
874 if ((err = info->fbops->fb_pan_display(var, info)))
875 return err;
876 info->var.xoffset = var->xoffset;
877 info->var.yoffset = var->yoffset;
878 if (var->vmode & FB_VMODE_YWRAP)
879 info->var.vmode |= FB_VMODE_YWRAP;
880 else
881 info->var.vmode &= ~FB_VMODE_YWRAP;
882 return 0;
883 }
884
885 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
886 u32 activate)
887 {
888 struct fb_event event;
889 struct fb_blit_caps caps, fbcaps;
890 int err = 0;
891
892 memset(&caps, 0, sizeof(caps));
893 memset(&fbcaps, 0, sizeof(fbcaps));
894 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
895 event.info = info;
896 event.data = &caps;
897 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
898 info->fbops->fb_get_caps(info, &fbcaps, var);
899
900 if (((fbcaps.x ^ caps.x) & caps.x) ||
901 ((fbcaps.y ^ caps.y) & caps.y) ||
902 (fbcaps.len < caps.len))
903 err = -EINVAL;
904
905 return err;
906 }
907
908 int
909 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
910 {
911 int flags = info->flags;
912 int ret = 0;
913
914 if (var->activate & FB_ACTIVATE_INV_MODE) {
915 struct fb_videomode mode1, mode2;
916
917 fb_var_to_videomode(&mode1, var);
918 fb_var_to_videomode(&mode2, &info->var);
919 /* make sure we don't delete the videomode of current var */
920 ret = fb_mode_is_equal(&mode1, &mode2);
921
922 if (!ret) {
923 struct fb_event event;
924
925 event.info = info;
926 event.data = &mode1;
927 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
928 }
929
930 if (!ret)
931 fb_delete_videomode(&mode1, &info->modelist);
932
933
934 ret = (ret) ? -EINVAL : 0;
935 goto done;
936 }
937
938 if ((var->activate & FB_ACTIVATE_FORCE) ||
939 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
940 u32 activate = var->activate;
941
942 if (!info->fbops->fb_check_var) {
943 *var = info->var;
944 goto done;
945 }
946
947 ret = info->fbops->fb_check_var(var, info);
948
949 if (ret)
950 goto done;
951
952 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
953 struct fb_videomode mode;
954
955 if (info->fbops->fb_get_caps) {
956 ret = fb_check_caps(info, var, activate);
957
958 if (ret)
959 goto done;
960 }
961
962 info->var = *var;
963
964 if (info->fbops->fb_set_par)
965 info->fbops->fb_set_par(info);
966
967 fb_pan_display(info, &info->var);
968 fb_set_cmap(&info->cmap, info);
969 fb_var_to_videomode(&mode, &info->var);
970
971 if (info->modelist.prev && info->modelist.next &&
972 !list_empty(&info->modelist))
973 ret = fb_add_videomode(&mode, &info->modelist);
974
975 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
976 struct fb_event event;
977 int evnt = (activate & FB_ACTIVATE_ALL) ?
978 FB_EVENT_MODE_CHANGE_ALL :
979 FB_EVENT_MODE_CHANGE;
980
981 info->flags &= ~FBINFO_MISC_USEREVENT;
982 event.info = info;
983 fb_notifier_call_chain(evnt, &event);
984 }
985 }
986 }
987
988 done:
989 return ret;
990 }
991
992 int
993 fb_blank(struct fb_info *info, int blank)
994 {
995 int ret = -EINVAL;
996
997 if (blank > FB_BLANK_POWERDOWN)
998 blank = FB_BLANK_POWERDOWN;
999
1000 if (info->fbops->fb_blank)
1001 ret = info->fbops->fb_blank(blank, info);
1002
1003 if (!ret) {
1004 struct fb_event event;
1005
1006 event.info = info;
1007 event.data = &blank;
1008 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1009 }
1010
1011 return ret;
1012 }
1013
1014 static int
1015 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1016 unsigned long arg)
1017 {
1018 int fbidx = iminor(inode);
1019 struct fb_info *info = registered_fb[fbidx];
1020 struct fb_ops *fb = info->fbops;
1021 struct fb_var_screeninfo var;
1022 struct fb_fix_screeninfo fix;
1023 struct fb_con2fbmap con2fb;
1024 struct fb_cmap_user cmap;
1025 struct fb_event event;
1026 void __user *argp = (void __user *)arg;
1027 int i;
1028
1029 if (!fb)
1030 return -ENODEV;
1031 switch (cmd) {
1032 case FBIOGET_VSCREENINFO:
1033 return copy_to_user(argp, &info->var,
1034 sizeof(var)) ? -EFAULT : 0;
1035 case FBIOPUT_VSCREENINFO:
1036 if (copy_from_user(&var, argp, sizeof(var)))
1037 return -EFAULT;
1038 acquire_console_sem();
1039 info->flags |= FBINFO_MISC_USEREVENT;
1040 i = fb_set_var(info, &var);
1041 info->flags &= ~FBINFO_MISC_USEREVENT;
1042 release_console_sem();
1043 if (i) return i;
1044 if (copy_to_user(argp, &var, sizeof(var)))
1045 return -EFAULT;
1046 return 0;
1047 case FBIOGET_FSCREENINFO:
1048 return copy_to_user(argp, &info->fix,
1049 sizeof(fix)) ? -EFAULT : 0;
1050 case FBIOPUTCMAP:
1051 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1052 return -EFAULT;
1053 return (fb_set_user_cmap(&cmap, info));
1054 case FBIOGETCMAP:
1055 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1056 return -EFAULT;
1057 return fb_cmap_to_user(&info->cmap, &cmap);
1058 case FBIOPAN_DISPLAY:
1059 if (copy_from_user(&var, argp, sizeof(var)))
1060 return -EFAULT;
1061 acquire_console_sem();
1062 i = fb_pan_display(info, &var);
1063 release_console_sem();
1064 if (i)
1065 return i;
1066 if (copy_to_user(argp, &var, sizeof(var)))
1067 return -EFAULT;
1068 return 0;
1069 case FBIO_CURSOR:
1070 return -EINVAL;
1071 case FBIOGET_CON2FBMAP:
1072 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1073 return -EFAULT;
1074 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1075 return -EINVAL;
1076 con2fb.framebuffer = -1;
1077 event.info = info;
1078 event.data = &con2fb;
1079 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1080 return copy_to_user(argp, &con2fb,
1081 sizeof(con2fb)) ? -EFAULT : 0;
1082 case FBIOPUT_CON2FBMAP:
1083 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1084 return - EFAULT;
1085 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1086 return -EINVAL;
1087 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1088 return -EINVAL;
1089 #ifdef CONFIG_KMOD
1090 if (!registered_fb[con2fb.framebuffer])
1091 try_to_load(con2fb.framebuffer);
1092 #endif /* CONFIG_KMOD */
1093 if (!registered_fb[con2fb.framebuffer])
1094 return -EINVAL;
1095 event.info = info;
1096 event.data = &con2fb;
1097 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1098 &event);
1099 case FBIOBLANK:
1100 acquire_console_sem();
1101 info->flags |= FBINFO_MISC_USEREVENT;
1102 i = fb_blank(info, arg);
1103 info->flags &= ~FBINFO_MISC_USEREVENT;
1104 release_console_sem();
1105 return i;
1106 default:
1107 if (fb->fb_ioctl == NULL)
1108 return -EINVAL;
1109 return fb->fb_ioctl(info, cmd, arg);
1110 }
1111 }
1112
1113 #ifdef CONFIG_COMPAT
1114 struct fb_fix_screeninfo32 {
1115 char id[16];
1116 compat_caddr_t smem_start;
1117 u32 smem_len;
1118 u32 type;
1119 u32 type_aux;
1120 u32 visual;
1121 u16 xpanstep;
1122 u16 ypanstep;
1123 u16 ywrapstep;
1124 u32 line_length;
1125 compat_caddr_t mmio_start;
1126 u32 mmio_len;
1127 u32 accel;
1128 u16 reserved[3];
1129 };
1130
1131 struct fb_cmap32 {
1132 u32 start;
1133 u32 len;
1134 compat_caddr_t red;
1135 compat_caddr_t green;
1136 compat_caddr_t blue;
1137 compat_caddr_t transp;
1138 };
1139
1140 static int fb_getput_cmap(struct inode *inode, struct file *file,
1141 unsigned int cmd, unsigned long arg)
1142 {
1143 struct fb_cmap_user __user *cmap;
1144 struct fb_cmap32 __user *cmap32;
1145 __u32 data;
1146 int err;
1147
1148 cmap = compat_alloc_user_space(sizeof(*cmap));
1149 cmap32 = compat_ptr(arg);
1150
1151 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1152 return -EFAULT;
1153
1154 if (get_user(data, &cmap32->red) ||
1155 put_user(compat_ptr(data), &cmap->red) ||
1156 get_user(data, &cmap32->green) ||
1157 put_user(compat_ptr(data), &cmap->green) ||
1158 get_user(data, &cmap32->blue) ||
1159 put_user(compat_ptr(data), &cmap->blue) ||
1160 get_user(data, &cmap32->transp) ||
1161 put_user(compat_ptr(data), &cmap->transp))
1162 return -EFAULT;
1163
1164 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1165
1166 if (!err) {
1167 if (copy_in_user(&cmap32->start,
1168 &cmap->start,
1169 2 * sizeof(__u32)))
1170 err = -EFAULT;
1171 }
1172 return err;
1173 }
1174
1175 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1176 struct fb_fix_screeninfo32 __user *fix32)
1177 {
1178 __u32 data;
1179 int err;
1180
1181 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1182
1183 data = (__u32) (unsigned long) fix->smem_start;
1184 err |= put_user(data, &fix32->smem_start);
1185
1186 err |= put_user(fix->smem_len, &fix32->smem_len);
1187 err |= put_user(fix->type, &fix32->type);
1188 err |= put_user(fix->type_aux, &fix32->type_aux);
1189 err |= put_user(fix->visual, &fix32->visual);
1190 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1191 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1192 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1193 err |= put_user(fix->line_length, &fix32->line_length);
1194
1195 data = (__u32) (unsigned long) fix->mmio_start;
1196 err |= put_user(data, &fix32->mmio_start);
1197
1198 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1199 err |= put_user(fix->accel, &fix32->accel);
1200 err |= copy_to_user(fix32->reserved, fix->reserved,
1201 sizeof(fix->reserved));
1202
1203 return err;
1204 }
1205
1206 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1207 unsigned int cmd, unsigned long arg)
1208 {
1209 mm_segment_t old_fs;
1210 struct fb_fix_screeninfo fix;
1211 struct fb_fix_screeninfo32 __user *fix32;
1212 int err;
1213
1214 fix32 = compat_ptr(arg);
1215
1216 old_fs = get_fs();
1217 set_fs(KERNEL_DS);
1218 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1219 set_fs(old_fs);
1220
1221 if (!err)
1222 err = do_fscreeninfo_to_user(&fix, fix32);
1223
1224 return err;
1225 }
1226
1227 static long
1228 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1229 {
1230 struct inode *inode = file->f_path.dentry->d_inode;
1231 int fbidx = iminor(inode);
1232 struct fb_info *info = registered_fb[fbidx];
1233 struct fb_ops *fb = info->fbops;
1234 long ret = -ENOIOCTLCMD;
1235
1236 lock_kernel();
1237 switch(cmd) {
1238 case FBIOGET_VSCREENINFO:
1239 case FBIOPUT_VSCREENINFO:
1240 case FBIOPAN_DISPLAY:
1241 case FBIOGET_CON2FBMAP:
1242 case FBIOPUT_CON2FBMAP:
1243 arg = (unsigned long) compat_ptr(arg);
1244 case FBIOBLANK:
1245 ret = fb_ioctl(inode, file, cmd, arg);
1246 break;
1247
1248 case FBIOGET_FSCREENINFO:
1249 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1250 break;
1251
1252 case FBIOGETCMAP:
1253 case FBIOPUTCMAP:
1254 ret = fb_getput_cmap(inode, file, cmd, arg);
1255 break;
1256
1257 default:
1258 if (fb->fb_compat_ioctl)
1259 ret = fb->fb_compat_ioctl(info, cmd, arg);
1260 break;
1261 }
1262 unlock_kernel();
1263 return ret;
1264 }
1265 #endif
1266
1267 static int
1268 fb_mmap(struct file *file, struct vm_area_struct * vma)
1269 {
1270 int fbidx = iminor(file->f_path.dentry->d_inode);
1271 struct fb_info *info = registered_fb[fbidx];
1272 struct fb_ops *fb = info->fbops;
1273 unsigned long off;
1274 unsigned long start;
1275 u32 len;
1276
1277 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1278 return -EINVAL;
1279 off = vma->vm_pgoff << PAGE_SHIFT;
1280 if (!fb)
1281 return -ENODEV;
1282 if (fb->fb_mmap) {
1283 int res;
1284 lock_kernel();
1285 res = fb->fb_mmap(info, vma);
1286 unlock_kernel();
1287 return res;
1288 }
1289
1290 lock_kernel();
1291
1292 /* frame buffer memory */
1293 start = info->fix.smem_start;
1294 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1295 if (off >= len) {
1296 /* memory mapped io */
1297 off -= len;
1298 if (info->var.accel_flags) {
1299 unlock_kernel();
1300 return -EINVAL;
1301 }
1302 start = info->fix.mmio_start;
1303 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1304 }
1305 unlock_kernel();
1306 start &= PAGE_MASK;
1307 if ((vma->vm_end - vma->vm_start + off) > len)
1308 return -EINVAL;
1309 off += start;
1310 vma->vm_pgoff = off >> PAGE_SHIFT;
1311 /* This is an IO map - tell maydump to skip this VMA */
1312 vma->vm_flags |= VM_IO | VM_RESERVED;
1313 fb_pgprotect(file, vma, off);
1314 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1315 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1316 return -EAGAIN;
1317 return 0;
1318 }
1319
1320 static int
1321 fb_open(struct inode *inode, struct file *file)
1322 {
1323 int fbidx = iminor(inode);
1324 struct fb_info *info;
1325 int res = 0;
1326
1327 if (fbidx >= FB_MAX)
1328 return -ENODEV;
1329 lock_kernel();
1330 #ifdef CONFIG_KMOD
1331 if (!(info = registered_fb[fbidx]))
1332 try_to_load(fbidx);
1333 #endif /* CONFIG_KMOD */
1334 if (!(info = registered_fb[fbidx])) {
1335 res = -ENODEV;
1336 goto out;
1337 }
1338 if (!try_module_get(info->fbops->owner)) {
1339 res = -ENODEV;
1340 goto out;
1341 }
1342 file->private_data = info;
1343 if (info->fbops->fb_open) {
1344 res = info->fbops->fb_open(info,1);
1345 if (res)
1346 module_put(info->fbops->owner);
1347 }
1348 out:
1349 unlock_kernel();
1350 return res;
1351 }
1352
1353 static int
1354 fb_release(struct inode *inode, struct file *file)
1355 {
1356 struct fb_info * const info = file->private_data;
1357
1358 lock_kernel();
1359 if (info->fbops->fb_release)
1360 info->fbops->fb_release(info,1);
1361 module_put(info->fbops->owner);
1362 unlock_kernel();
1363 return 0;
1364 }
1365
1366 static const struct file_operations fb_fops = {
1367 .owner = THIS_MODULE,
1368 .read = fb_read,
1369 .write = fb_write,
1370 .ioctl = fb_ioctl,
1371 #ifdef CONFIG_COMPAT
1372 .compat_ioctl = fb_compat_ioctl,
1373 #endif
1374 .mmap = fb_mmap,
1375 .open = fb_open,
1376 .release = fb_release,
1377 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1378 .get_unmapped_area = get_fb_unmapped_area,
1379 #endif
1380 #ifdef CONFIG_FB_DEFERRED_IO
1381 .fsync = fb_deferred_io_fsync,
1382 #endif
1383 };
1384
1385 struct class *fb_class;
1386 EXPORT_SYMBOL(fb_class);
1387
1388 static int fb_check_foreignness(struct fb_info *fi)
1389 {
1390 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1391
1392 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1393
1394 #ifdef __BIG_ENDIAN
1395 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1396 #else
1397 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1398 #endif /* __BIG_ENDIAN */
1399
1400 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1401 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1402 "support this framebuffer\n", fi->fix.id);
1403 return -ENOSYS;
1404 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1405 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1406 "support this framebuffer\n", fi->fix.id);
1407 return -ENOSYS;
1408 }
1409
1410 return 0;
1411 }
1412
1413 /**
1414 * register_framebuffer - registers a frame buffer device
1415 * @fb_info: frame buffer info structure
1416 *
1417 * Registers a frame buffer device @fb_info.
1418 *
1419 * Returns negative errno on error, or zero for success.
1420 *
1421 */
1422
1423 int
1424 register_framebuffer(struct fb_info *fb_info)
1425 {
1426 int i;
1427 struct fb_event event;
1428 struct fb_videomode mode;
1429
1430 if (num_registered_fb == FB_MAX)
1431 return -ENXIO;
1432
1433 if (fb_check_foreignness(fb_info))
1434 return -ENOSYS;
1435
1436 num_registered_fb++;
1437 for (i = 0 ; i < FB_MAX; i++)
1438 if (!registered_fb[i])
1439 break;
1440 fb_info->node = i;
1441
1442 fb_info->dev = device_create(fb_class, fb_info->device,
1443 MKDEV(FB_MAJOR, i), "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");
Stable & featurefull patchset based on Linus's git branch