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Fix new incorrect error return from do_md_stop.
[linux-2.6/mini2440.git] / drivers / video / fbmem.c
bloba85c818be9453ecbdf11310b8a77f41435652000
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/kernel.h>
20 #include <linux/major.h>
21 #include <linux/slab.h>
22 #include <linux/mm.h>
23 #include <linux/mman.h>
24 #include <linux/vt.h>
25 #include <linux/init.h>
26 #include <linux/linux_logo.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/console.h>
30 #include <linux/kmod.h>
31 #include <linux/err.h>
32 #include <linux/device.h>
33 #include <linux/efi.h>
34 #include <linux/fb.h>
35
36 #include <asm/fb.h>
37
38
39 /*
40 * Frame buffer device initialization and setup routines
41 */
42
43 #define FBPIXMAPSIZE (1024 * 8)
44
45 struct fb_info *registered_fb[FB_MAX] __read_mostly;
46 int num_registered_fb __read_mostly;
47
48 int lock_fb_info(struct fb_info *info)
49 {
50 mutex_lock(&info->lock);
51 if (!info->fbops) {
52 mutex_unlock(&info->lock);
53 return 0;
54 }
55 return 1;
56 }
57 EXPORT_SYMBOL(lock_fb_info);
58
59 /*
60 * Helpers
61 */
62
63 int fb_get_color_depth(struct fb_var_screeninfo *var,
64 struct fb_fix_screeninfo *fix)
65 {
66 int depth = 0;
67
68 if (fix->visual == FB_VISUAL_MONO01 ||
69 fix->visual == FB_VISUAL_MONO10)
70 depth = 1;
71 else {
72 if (var->green.length == var->blue.length &&
73 var->green.length == var->red.length &&
74 var->green.offset == var->blue.offset &&
75 var->green.offset == var->red.offset)
76 depth = var->green.length;
77 else
78 depth = var->green.length + var->red.length +
79 var->blue.length;
80 }
81
82 return depth;
83 }
84 EXPORT_SYMBOL(fb_get_color_depth);
85
86 /*
87 * Data padding functions.
88 */
89 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
90 {
91 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
92 }
93 EXPORT_SYMBOL(fb_pad_aligned_buffer);
94
95 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
96 u32 shift_high, u32 shift_low, u32 mod)
97 {
98 u8 mask = (u8) (0xfff << shift_high), tmp;
99 int i, j;
100
101 for (i = height; i--; ) {
102 for (j = 0; j < idx; j++) {
103 tmp = dst[j];
104 tmp &= mask;
105 tmp |= *src >> shift_low;
106 dst[j] = tmp;
107 tmp = *src << shift_high;
108 dst[j+1] = tmp;
109 src++;
110 }
111 tmp = dst[idx];
112 tmp &= mask;
113 tmp |= *src >> shift_low;
114 dst[idx] = tmp;
115 if (shift_high < mod) {
116 tmp = *src << shift_high;
117 dst[idx+1] = tmp;
118 }
119 src++;
120 dst += d_pitch;
121 }
122 }
123 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
124
125 /*
126 * we need to lock this section since fb_cursor
127 * may use fb_imageblit()
128 */
129 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
130 {
131 u32 align = buf->buf_align - 1, offset;
132 char *addr = buf->addr;
133
134 /* If IO mapped, we need to sync before access, no sharing of
135 * the pixmap is done
136 */
137 if (buf->flags & FB_PIXMAP_IO) {
138 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
139 info->fbops->fb_sync(info);
140 return addr;
141 }
142
143 /* See if we fit in the remaining pixmap space */
144 offset = buf->offset + align;
145 offset &= ~align;
146 if (offset + size > buf->size) {
147 /* We do not fit. In order to be able to re-use the buffer,
148 * we must ensure no asynchronous DMA'ing or whatever operation
149 * is in progress, we sync for that.
150 */
151 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
152 info->fbops->fb_sync(info);
153 offset = 0;
154 }
155 buf->offset = offset + size;
156 addr += offset;
157
158 return addr;
159 }
160
161 #ifdef CONFIG_LOGO
162
163 static inline unsigned safe_shift(unsigned d, int n)
164 {
165 return n < 0 ? d >> -n : d << n;
166 }
167
168 static void fb_set_logocmap(struct fb_info *info,
169 const struct linux_logo *logo)
170 {
171 struct fb_cmap palette_cmap;
172 u16 palette_green[16];
173 u16 palette_blue[16];
174 u16 palette_red[16];
175 int i, j, n;
176 const unsigned char *clut = logo->clut;
177
178 palette_cmap.start = 0;
179 palette_cmap.len = 16;
180 palette_cmap.red = palette_red;
181 palette_cmap.green = palette_green;
182 palette_cmap.blue = palette_blue;
183 palette_cmap.transp = NULL;
184
185 for (i = 0; i < logo->clutsize; i += n) {
186 n = logo->clutsize - i;
187 /* palette_cmap provides space for only 16 colors at once */
188 if (n > 16)
189 n = 16;
190 palette_cmap.start = 32 + i;
191 palette_cmap.len = n;
192 for (j = 0; j < n; ++j) {
193 palette_cmap.red[j] = clut[0] << 8 | clut[0];
194 palette_cmap.green[j] = clut[1] << 8 | clut[1];
195 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
196 clut += 3;
197 }
198 fb_set_cmap(&palette_cmap, info);
199 }
200 }
201
202 static void fb_set_logo_truepalette(struct fb_info *info,
203 const struct linux_logo *logo,
204 u32 *palette)
205 {
206 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
207 unsigned char redmask, greenmask, bluemask;
208 int redshift, greenshift, blueshift;
209 int i;
210 const unsigned char *clut = logo->clut;
211
212 /*
213 * We have to create a temporary palette since console palette is only
214 * 16 colors long.
215 */
216 /* Bug: Doesn't obey msb_right ... (who needs that?) */
217 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
218 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
219 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
220 redshift = info->var.red.offset - (8 - info->var.red.length);
221 greenshift = info->var.green.offset - (8 - info->var.green.length);
222 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
223
224 for ( i = 0; i < logo->clutsize; i++) {
225 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
226 safe_shift((clut[1] & greenmask), greenshift) |
227 safe_shift((clut[2] & bluemask), blueshift));
228 clut += 3;
229 }
230 }
231
232 static void fb_set_logo_directpalette(struct fb_info *info,
233 const struct linux_logo *logo,
234 u32 *palette)
235 {
236 int redshift, greenshift, blueshift;
237 int i;
238
239 redshift = info->var.red.offset;
240 greenshift = info->var.green.offset;
241 blueshift = info->var.blue.offset;
242
243 for (i = 32; i < 32 + logo->clutsize; i++)
244 palette[i] = i << redshift | i << greenshift | i << blueshift;
245 }
246
247 static void fb_set_logo(struct fb_info *info,
248 const struct linux_logo *logo, u8 *dst,
249 int depth)
250 {
251 int i, j, k;
252 const u8 *src = logo->data;
253 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
254 u8 fg = 1, d;
255
256 switch (fb_get_color_depth(&info->var, &info->fix)) {
257 case 1:
258 fg = 1;
259 break;
260 case 2:
261 fg = 3;
262 break;
263 default:
264 fg = 7;
265 break;
266 }
267
268 if (info->fix.visual == FB_VISUAL_MONO01 ||
269 info->fix.visual == FB_VISUAL_MONO10)
270 fg = ~((u8) (0xfff << info->var.green.length));
271
272 switch (depth) {
273 case 4:
274 for (i = 0; i < logo->height; i++)
275 for (j = 0; j < logo->width; src++) {
276 *dst++ = *src >> 4;
277 j++;
278 if (j < logo->width) {
279 *dst++ = *src & 0x0f;
280 j++;
281 }
282 }
283 break;
284 case 1:
285 for (i = 0; i < logo->height; i++) {
286 for (j = 0; j < logo->width; src++) {
287 d = *src ^ xor;
288 for (k = 7; k >= 0; k--) {
289 *dst++ = ((d >> k) & 1) ? fg : 0;
290 j++;
291 }
292 }
293 }
294 break;
295 }
296 }
297
298 /*
299 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
300 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
301 * the visual format and color depth of the framebuffer, the DAC, the
302 * pseudo_palette, and the logo data will be adjusted accordingly.
303 *
304 * Case 1 - linux_logo_clut224:
305 * Color exceeds the number of console colors (16), thus we set the hardware DAC
306 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
307 *
308 * For visuals that require color info from the pseudo_palette, we also construct
309 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
310 * will be set.
311 *
312 * Case 2 - linux_logo_vga16:
313 * The number of colors just matches the console colors, thus there is no need
314 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
315 * each byte contains color information for two pixels (upper and lower nibble).
316 * To be consistent with fb_imageblit() usage, we therefore separate the two
317 * nibbles into separate bytes. The "depth" flag will be set to 4.
318 *
319 * Case 3 - linux_logo_mono:
320 * This is similar with Case 2. Each byte contains information for 8 pixels.
321 * We isolate each bit and expand each into a byte. The "depth" flag will
322 * be set to 1.
323 */
324 static struct logo_data {
325 int depth;
326 int needs_directpalette;
327 int needs_truepalette;
328 int needs_cmapreset;
329 const struct linux_logo *logo;
330 } fb_logo __read_mostly;
331
332 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334 u32 size = width * height, i;
335
336 out += size - 1;
337
338 for (i = size; i--; )
339 *out-- = *in++;
340 }
341
342 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
343 {
344 int i, j, h = height - 1;
345
346 for (i = 0; i < height; i++)
347 for (j = 0; j < width; j++)
348 out[height * j + h - i] = *in++;
349 }
350
351 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
352 {
353 int i, j, w = width - 1;
354
355 for (i = 0; i < height; i++)
356 for (j = 0; j < width; j++)
357 out[height * (w - j) + i] = *in++;
358 }
359
360 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
361 struct fb_image *image, int rotate)
362 {
363 u32 tmp;
364
365 if (rotate == FB_ROTATE_UD) {
366 fb_rotate_logo_ud(image->data, dst, image->width,
367 image->height);
368 image->dx = info->var.xres - image->width - image->dx;
369 image->dy = info->var.yres - image->height - image->dy;
370 } else if (rotate == FB_ROTATE_CW) {
371 fb_rotate_logo_cw(image->data, dst, image->width,
372 image->height);
373 tmp = image->width;
374 image->width = image->height;
375 image->height = tmp;
376 tmp = image->dy;
377 image->dy = image->dx;
378 image->dx = info->var.xres - image->width - tmp;
379 } else if (rotate == FB_ROTATE_CCW) {
380 fb_rotate_logo_ccw(image->data, dst, image->width,
381 image->height);
382 tmp = image->width;
383 image->width = image->height;
384 image->height = tmp;
385 tmp = image->dx;
386 image->dx = image->dy;
387 image->dy = info->var.yres - image->height - tmp;
388 }
389
390 image->data = dst;
391 }
392
393 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
394 int rotate, unsigned int num)
395 {
396 unsigned int x;
397
398 if (rotate == FB_ROTATE_UR) {
399 for (x = 0;
400 x < num && image->dx + image->width <= info->var.xres;
401 x++) {
402 info->fbops->fb_imageblit(info, image);
403 image->dx += image->width + 8;
404 }
405 } else if (rotate == FB_ROTATE_UD) {
406 for (x = 0; x < num && image->dx >= 0; x++) {
407 info->fbops->fb_imageblit(info, image);
408 image->dx -= image->width + 8;
409 }
410 } else if (rotate == FB_ROTATE_CW) {
411 for (x = 0;
412 x < num && image->dy + image->height <= info->var.yres;
413 x++) {
414 info->fbops->fb_imageblit(info, image);
415 image->dy += image->height + 8;
416 }
417 } else if (rotate == FB_ROTATE_CCW) {
418 for (x = 0; x < num && image->dy >= 0; x++) {
419 info->fbops->fb_imageblit(info, image);
420 image->dy -= image->height + 8;
421 }
422 }
423 }
424
425 static int fb_show_logo_line(struct fb_info *info, int rotate,
426 const struct linux_logo *logo, int y,
427 unsigned int n)
428 {
429 u32 *palette = NULL, *saved_pseudo_palette = NULL;
430 unsigned char *logo_new = NULL, *logo_rotate = NULL;
431 struct fb_image image;
432
433 /* Return if the frame buffer is not mapped or suspended */
434 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
435 info->flags & FBINFO_MODULE)
436 return 0;
437
438 image.depth = 8;
439 image.data = logo->data;
440
441 if (fb_logo.needs_cmapreset)
442 fb_set_logocmap(info, logo);
443
444 if (fb_logo.needs_truepalette ||
445 fb_logo.needs_directpalette) {
446 palette = kmalloc(256 * 4, GFP_KERNEL);
447 if (palette == NULL)
448 return 0;
449
450 if (fb_logo.needs_truepalette)
451 fb_set_logo_truepalette(info, logo, palette);
452 else
453 fb_set_logo_directpalette(info, logo, palette);
454
455 saved_pseudo_palette = info->pseudo_palette;
456 info->pseudo_palette = palette;
457 }
458
459 if (fb_logo.depth <= 4) {
460 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
461 if (logo_new == NULL) {
462 kfree(palette);
463 if (saved_pseudo_palette)
464 info->pseudo_palette = saved_pseudo_palette;
465 return 0;
466 }
467 image.data = logo_new;
468 fb_set_logo(info, logo, logo_new, fb_logo.depth);
469 }
470
471 image.dx = 0;
472 image.dy = y;
473 image.width = logo->width;
474 image.height = logo->height;
475
476 if (rotate) {
477 logo_rotate = kmalloc(logo->width *
478 logo->height, GFP_KERNEL);
479 if (logo_rotate)
480 fb_rotate_logo(info, logo_rotate, &image, rotate);
481 }
482
483 fb_do_show_logo(info, &image, rotate, n);
484
485 kfree(palette);
486 if (saved_pseudo_palette != NULL)
487 info->pseudo_palette = saved_pseudo_palette;
488 kfree(logo_new);
489 kfree(logo_rotate);
490 return logo->height;
491 }
492
493
494 #ifdef CONFIG_FB_LOGO_EXTRA
495
496 #define FB_LOGO_EX_NUM_MAX 10
497 static struct logo_data_extra {
498 const struct linux_logo *logo;
499 unsigned int n;
500 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
501 static unsigned int fb_logo_ex_num;
502
503 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
504 {
505 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
506 return;
507
508 fb_logo_ex[fb_logo_ex_num].logo = logo;
509 fb_logo_ex[fb_logo_ex_num].n = n;
510 fb_logo_ex_num++;
511 }
512
513 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
514 unsigned int yres)
515 {
516 unsigned int i;
517
518 /* FIXME: logo_ex supports only truecolor fb. */
519 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
520 fb_logo_ex_num = 0;
521
522 for (i = 0; i < fb_logo_ex_num; i++) {
523 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
524 fb_logo_ex[i].logo = NULL;
525 continue;
526 }
527 height += fb_logo_ex[i].logo->height;
528 if (height > yres) {
529 height -= fb_logo_ex[i].logo->height;
530 fb_logo_ex_num = i;
531 break;
532 }
533 }
534 return height;
535 }
536
537 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
538 {
539 unsigned int i;
540
541 for (i = 0; i < fb_logo_ex_num; i++)
542 y += fb_show_logo_line(info, rotate,
543 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
544
545 return y;
546 }
547
548 #else /* !CONFIG_FB_LOGO_EXTRA */
549
550 static inline int fb_prepare_extra_logos(struct fb_info *info,
551 unsigned int height,
552 unsigned int yres)
553 {
554 return height;
555 }
556
557 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
558 {
559 return y;
560 }
561
562 #endif /* CONFIG_FB_LOGO_EXTRA */
563
564
565 int fb_prepare_logo(struct fb_info *info, int rotate)
566 {
567 int depth = fb_get_color_depth(&info->var, &info->fix);
568 unsigned int yres;
569
570 memset(&fb_logo, 0, sizeof(struct logo_data));
571
572 if (info->flags & FBINFO_MISC_TILEBLITTING ||
573 info->flags & FBINFO_MODULE)
574 return 0;
575
576 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
577 depth = info->var.blue.length;
578 if (info->var.red.length < depth)
579 depth = info->var.red.length;
580 if (info->var.green.length < depth)
581 depth = info->var.green.length;
582 }
583
584 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
585 /* assume console colormap */
586 depth = 4;
587 }
588
589 /* Return if no suitable logo was found */
590 fb_logo.logo = fb_find_logo(depth);
591
592 if (!fb_logo.logo) {
593 return 0;
594 }
595
596 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
597 yres = info->var.yres;
598 else
599 yres = info->var.xres;
600
601 if (fb_logo.logo->height > yres) {
602 fb_logo.logo = NULL;
603 return 0;
604 }
605
606 /* What depth we asked for might be different from what we get */
607 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
608 fb_logo.depth = 8;
609 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
610 fb_logo.depth = 4;
611 else
612 fb_logo.depth = 1;
613
614
615 if (fb_logo.depth > 4 && depth > 4) {
616 switch (info->fix.visual) {
617 case FB_VISUAL_TRUECOLOR:
618 fb_logo.needs_truepalette = 1;
619 break;
620 case FB_VISUAL_DIRECTCOLOR:
621 fb_logo.needs_directpalette = 1;
622 fb_logo.needs_cmapreset = 1;
623 break;
624 case FB_VISUAL_PSEUDOCOLOR:
625 fb_logo.needs_cmapreset = 1;
626 break;
627 }
628 }
629
630 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
631 }
632
633 int fb_show_logo(struct fb_info *info, int rotate)
634 {
635 int y;
636
637 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
638 num_online_cpus());
639 y = fb_show_extra_logos(info, y, rotate);
640
641 return y;
642 }
643 #else
644 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
645 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
646 #endif /* CONFIG_LOGO */
647
648 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
649 {
650 return (*pos < FB_MAX) ? pos : NULL;
651 }
652
653 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
654 {
655 (*pos)++;
656 return (*pos < FB_MAX) ? pos : NULL;
657 }
658
659 static void fb_seq_stop(struct seq_file *m, void *v)
660 {
661 }
662
663 static int fb_seq_show(struct seq_file *m, void *v)
664 {
665 int i = *(loff_t *)v;
666 struct fb_info *fi = registered_fb[i];
667
668 if (fi)
669 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
670 return 0;
671 }
672
673 static const struct seq_operations proc_fb_seq_ops = {
674 .start = fb_seq_start,
675 .next = fb_seq_next,
676 .stop = fb_seq_stop,
677 .show = fb_seq_show,
678 };
679
680 static int proc_fb_open(struct inode *inode, struct file *file)
681 {
682 return seq_open(file, &proc_fb_seq_ops);
683 }
684
685 static const struct file_operations fb_proc_fops = {
686 .owner = THIS_MODULE,
687 .open = proc_fb_open,
688 .read = seq_read,
689 .llseek = seq_lseek,
690 .release = seq_release,
691 };
692
693 static ssize_t
694 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
695 {
696 unsigned long p = *ppos;
697 struct inode *inode = file->f_path.dentry->d_inode;
698 int fbidx = iminor(inode);
699 struct fb_info *info = registered_fb[fbidx];
700 u32 *buffer, *dst;
701 u32 __iomem *src;
702 int c, i, cnt = 0, err = 0;
703 unsigned long total_size;
704
705 if (!info || ! info->screen_base)
706 return -ENODEV;
707
708 if (info->state != FBINFO_STATE_RUNNING)
709 return -EPERM;
710
711 if (info->fbops->fb_read)
712 return info->fbops->fb_read(info, buf, count, ppos);
713
714 total_size = info->screen_size;
715
716 if (total_size == 0)
717 total_size = info->fix.smem_len;
718
719 if (p >= total_size)
720 return 0;
721
722 if (count >= total_size)
723 count = total_size;
724
725 if (count + p > total_size)
726 count = total_size - p;
727
728 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
729 GFP_KERNEL);
730 if (!buffer)
731 return -ENOMEM;
732
733 src = (u32 __iomem *) (info->screen_base + p);
734
735 if (info->fbops->fb_sync)
736 info->fbops->fb_sync(info);
737
738 while (count) {
739 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
740 dst = buffer;
741 for (i = c >> 2; i--; )
742 *dst++ = fb_readl(src++);
743 if (c & 3) {
744 u8 *dst8 = (u8 *) dst;
745 u8 __iomem *src8 = (u8 __iomem *) src;
746
747 for (i = c & 3; i--;)
748 *dst8++ = fb_readb(src8++);
749
750 src = (u32 __iomem *) src8;
751 }
752
753 if (copy_to_user(buf, buffer, c)) {
754 err = -EFAULT;
755 break;
756 }
757 *ppos += c;
758 buf += c;
759 cnt += c;
760 count -= c;
761 }
762
763 kfree(buffer);
764
765 return (err) ? err : cnt;
766 }
767
768 static ssize_t
769 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
770 {
771 unsigned long p = *ppos;
772 struct inode *inode = file->f_path.dentry->d_inode;
773 int fbidx = iminor(inode);
774 struct fb_info *info = registered_fb[fbidx];
775 u32 *buffer, *src;
776 u32 __iomem *dst;
777 int c, i, cnt = 0, err = 0;
778 unsigned long total_size;
779
780 if (!info || !info->screen_base)
781 return -ENODEV;
782
783 if (info->state != FBINFO_STATE_RUNNING)
784 return -EPERM;
785
786 if (info->fbops->fb_write)
787 return info->fbops->fb_write(info, buf, count, ppos);
788
789 total_size = info->screen_size;
790
791 if (total_size == 0)
792 total_size = info->fix.smem_len;
793
794 if (p > total_size)
795 return -EFBIG;
796
797 if (count > total_size) {
798 err = -EFBIG;
799 count = total_size;
800 }
801
802 if (count + p > total_size) {
803 if (!err)
804 err = -ENOSPC;
805
806 count = total_size - p;
807 }
808
809 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
810 GFP_KERNEL);
811 if (!buffer)
812 return -ENOMEM;
813
814 dst = (u32 __iomem *) (info->screen_base + p);
815
816 if (info->fbops->fb_sync)
817 info->fbops->fb_sync(info);
818
819 while (count) {
820 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
821 src = buffer;
822
823 if (copy_from_user(src, buf, c)) {
824 err = -EFAULT;
825 break;
826 }
827
828 for (i = c >> 2; i--; )
829 fb_writel(*src++, dst++);
830
831 if (c & 3) {
832 u8 *src8 = (u8 *) src;
833 u8 __iomem *dst8 = (u8 __iomem *) dst;
834
835 for (i = c & 3; i--; )
836 fb_writeb(*src8++, dst8++);
837
838 dst = (u32 __iomem *) dst8;
839 }
840
841 *ppos += c;
842 buf += c;
843 cnt += c;
844 count -= c;
845 }
846
847 kfree(buffer);
848
849 return (cnt) ? cnt : err;
850 }
851
852 int
853 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
854 {
855 struct fb_fix_screeninfo *fix = &info->fix;
856 unsigned int yres = info->var.yres;
857 int err = 0;
858
859 if (var->yoffset > 0) {
860 if (var->vmode & FB_VMODE_YWRAP) {
861 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
862 err = -EINVAL;
863 else
864 yres = 0;
865 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
866 err = -EINVAL;
867 }
868
869 if (var->xoffset > 0 && (!fix->xpanstep ||
870 (var->xoffset % fix->xpanstep)))
871 err = -EINVAL;
872
873 if (err || !info->fbops->fb_pan_display ||
874 var->yoffset + yres > info->var.yres_virtual ||
875 var->xoffset + info->var.xres > info->var.xres_virtual)
876 return -EINVAL;
877
878 if ((err = info->fbops->fb_pan_display(var, info)))
879 return err;
880 info->var.xoffset = var->xoffset;
881 info->var.yoffset = var->yoffset;
882 if (var->vmode & FB_VMODE_YWRAP)
883 info->var.vmode |= FB_VMODE_YWRAP;
884 else
885 info->var.vmode &= ~FB_VMODE_YWRAP;
886 return 0;
887 }
888
889 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
890 u32 activate)
891 {
892 struct fb_event event;
893 struct fb_blit_caps caps, fbcaps;
894 int err = 0;
895
896 memset(&caps, 0, sizeof(caps));
897 memset(&fbcaps, 0, sizeof(fbcaps));
898 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
899 event.info = info;
900 event.data = &caps;
901 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
902 info->fbops->fb_get_caps(info, &fbcaps, var);
903
904 if (((fbcaps.x ^ caps.x) & caps.x) ||
905 ((fbcaps.y ^ caps.y) & caps.y) ||
906 (fbcaps.len < caps.len))
907 err = -EINVAL;
908
909 return err;
910 }
911
912 int
913 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
914 {
915 int flags = info->flags;
916 int ret = 0;
917
918 if (var->activate & FB_ACTIVATE_INV_MODE) {
919 struct fb_videomode mode1, mode2;
920
921 fb_var_to_videomode(&mode1, var);
922 fb_var_to_videomode(&mode2, &info->var);
923 /* make sure we don't delete the videomode of current var */
924 ret = fb_mode_is_equal(&mode1, &mode2);
925
926 if (!ret) {
927 struct fb_event event;
928
929 event.info = info;
930 event.data = &mode1;
931 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
932 }
933
934 if (!ret)
935 fb_delete_videomode(&mode1, &info->modelist);
936
937
938 ret = (ret) ? -EINVAL : 0;
939 goto done;
940 }
941
942 if ((var->activate & FB_ACTIVATE_FORCE) ||
943 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
944 u32 activate = var->activate;
945
946 if (!info->fbops->fb_check_var) {
947 *var = info->var;
948 goto done;
949 }
950
951 ret = info->fbops->fb_check_var(var, info);
952
953 if (ret)
954 goto done;
955
956 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
957 struct fb_videomode mode;
958
959 if (info->fbops->fb_get_caps) {
960 ret = fb_check_caps(info, var, activate);
961
962 if (ret)
963 goto done;
964 }
965
966 info->var = *var;
967
968 if (info->fbops->fb_set_par)
969 info->fbops->fb_set_par(info);
970
971 fb_pan_display(info, &info->var);
972 fb_set_cmap(&info->cmap, info);
973 fb_var_to_videomode(&mode, &info->var);
974
975 if (info->modelist.prev && info->modelist.next &&
976 !list_empty(&info->modelist))
977 ret = fb_add_videomode(&mode, &info->modelist);
978
979 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
980 struct fb_event event;
981 int evnt = (activate & FB_ACTIVATE_ALL) ?
982 FB_EVENT_MODE_CHANGE_ALL :
983 FB_EVENT_MODE_CHANGE;
984
985 info->flags &= ~FBINFO_MISC_USEREVENT;
986 event.info = info;
987 event.data = &mode;
988 fb_notifier_call_chain(evnt, &event);
989 }
990 }
991 }
992
993 done:
994 return ret;
995 }
996
997 int
998 fb_blank(struct fb_info *info, int blank)
999 {
1000 int ret = -EINVAL;
1001
1002 if (blank > FB_BLANK_POWERDOWN)
1003 blank = FB_BLANK_POWERDOWN;
1004
1005 if (info->fbops->fb_blank)
1006 ret = info->fbops->fb_blank(blank, info);
1007
1008 if (!ret) {
1009 struct fb_event event;
1010
1011 event.info = info;
1012 event.data = &blank;
1013 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1014 }
1015
1016 return ret;
1017 }
1018
1019 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1020 unsigned long arg)
1021 {
1022 struct fb_ops *fb;
1023 struct fb_var_screeninfo var;
1024 struct fb_fix_screeninfo fix;
1025 struct fb_con2fbmap con2fb;
1026 struct fb_cmap cmap_from;
1027 struct fb_cmap_user cmap;
1028 struct fb_event event;
1029 void __user *argp = (void __user *)arg;
1030 long ret = 0;
1031
1032 switch (cmd) {
1033 case FBIOGET_VSCREENINFO:
1034 if (!lock_fb_info(info))
1035 return -ENODEV;
1036 var = info->var;
1037 unlock_fb_info(info);
1038
1039 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1040 break;
1041 case FBIOPUT_VSCREENINFO:
1042 if (copy_from_user(&var, argp, sizeof(var)))
1043 return -EFAULT;
1044 if (!lock_fb_info(info))
1045 return -ENODEV;
1046 acquire_console_sem();
1047 info->flags |= FBINFO_MISC_USEREVENT;
1048 ret = fb_set_var(info, &var);
1049 info->flags &= ~FBINFO_MISC_USEREVENT;
1050 release_console_sem();
1051 unlock_fb_info(info);
1052 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1053 ret = -EFAULT;
1054 break;
1055 case FBIOGET_FSCREENINFO:
1056 if (!lock_fb_info(info))
1057 return -ENODEV;
1058 fix = info->fix;
1059 unlock_fb_info(info);
1060
1061 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1062 break;
1063 case FBIOPUTCMAP:
1064 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1065 return -EFAULT;
1066 ret = fb_set_user_cmap(&cmap, info);
1067 break;
1068 case FBIOGETCMAP:
1069 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1070 return -EFAULT;
1071 if (!lock_fb_info(info))
1072 return -ENODEV;
1073 cmap_from = info->cmap;
1074 unlock_fb_info(info);
1075 ret = fb_cmap_to_user(&cmap_from, &cmap);
1076 break;
1077 case FBIOPAN_DISPLAY:
1078 if (copy_from_user(&var, argp, sizeof(var)))
1079 return -EFAULT;
1080 if (!lock_fb_info(info))
1081 return -ENODEV;
1082 acquire_console_sem();
1083 ret = fb_pan_display(info, &var);
1084 release_console_sem();
1085 unlock_fb_info(info);
1086 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1087 return -EFAULT;
1088 break;
1089 case FBIO_CURSOR:
1090 ret = -EINVAL;
1091 break;
1092 case FBIOGET_CON2FBMAP:
1093 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1094 return -EFAULT;
1095 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1096 return -EINVAL;
1097 con2fb.framebuffer = -1;
1098 event.data = &con2fb;
1099 if (!lock_fb_info(info))
1100 return -ENODEV;
1101 event.info = info;
1102 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1103 unlock_fb_info(info);
1104 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1105 break;
1106 case FBIOPUT_CON2FBMAP:
1107 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1108 return -EFAULT;
1109 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1110 return -EINVAL;
1111 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1112 return -EINVAL;
1113 if (!registered_fb[con2fb.framebuffer])
1114 request_module("fb%d", con2fb.framebuffer);
1115 if (!registered_fb[con2fb.framebuffer]) {
1116 ret = -EINVAL;
1117 break;
1118 }
1119 event.data = &con2fb;
1120 if (!lock_fb_info(info))
1121 return -ENODEV;
1122 event.info = info;
1123 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1124 unlock_fb_info(info);
1125 break;
1126 case FBIOBLANK:
1127 if (!lock_fb_info(info))
1128 return -ENODEV;
1129 acquire_console_sem();
1130 info->flags |= FBINFO_MISC_USEREVENT;
1131 ret = fb_blank(info, arg);
1132 info->flags &= ~FBINFO_MISC_USEREVENT;
1133 release_console_sem();
1134 unlock_fb_info(info);
1135 break;
1136 default:
1137 if (!lock_fb_info(info))
1138 return -ENODEV;
1139 fb = info->fbops;
1140 if (fb->fb_ioctl)
1141 ret = fb->fb_ioctl(info, cmd, arg);
1142 else
1143 ret = -ENOTTY;
1144 unlock_fb_info(info);
1145 }
1146 return ret;
1147 }
1148
1149 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1150 {
1151 struct inode *inode = file->f_path.dentry->d_inode;
1152 int fbidx = iminor(inode);
1153 struct fb_info *info = registered_fb[fbidx];
1154
1155 return do_fb_ioctl(info, cmd, arg);
1156 }
1157
1158 #ifdef CONFIG_COMPAT
1159 struct fb_fix_screeninfo32 {
1160 char id[16];
1161 compat_caddr_t smem_start;
1162 u32 smem_len;
1163 u32 type;
1164 u32 type_aux;
1165 u32 visual;
1166 u16 xpanstep;
1167 u16 ypanstep;
1168 u16 ywrapstep;
1169 u32 line_length;
1170 compat_caddr_t mmio_start;
1171 u32 mmio_len;
1172 u32 accel;
1173 u16 reserved[3];
1174 };
1175
1176 struct fb_cmap32 {
1177 u32 start;
1178 u32 len;
1179 compat_caddr_t red;
1180 compat_caddr_t green;
1181 compat_caddr_t blue;
1182 compat_caddr_t transp;
1183 };
1184
1185 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1186 unsigned long arg)
1187 {
1188 struct fb_cmap_user __user *cmap;
1189 struct fb_cmap32 __user *cmap32;
1190 __u32 data;
1191 int err;
1192
1193 cmap = compat_alloc_user_space(sizeof(*cmap));
1194 cmap32 = compat_ptr(arg);
1195
1196 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1197 return -EFAULT;
1198
1199 if (get_user(data, &cmap32->red) ||
1200 put_user(compat_ptr(data), &cmap->red) ||
1201 get_user(data, &cmap32->green) ||
1202 put_user(compat_ptr(data), &cmap->green) ||
1203 get_user(data, &cmap32->blue) ||
1204 put_user(compat_ptr(data), &cmap->blue) ||
1205 get_user(data, &cmap32->transp) ||
1206 put_user(compat_ptr(data), &cmap->transp))
1207 return -EFAULT;
1208
1209 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1210
1211 if (!err) {
1212 if (copy_in_user(&cmap32->start,
1213 &cmap->start,
1214 2 * sizeof(__u32)))
1215 err = -EFAULT;
1216 }
1217 return err;
1218 }
1219
1220 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1221 struct fb_fix_screeninfo32 __user *fix32)
1222 {
1223 __u32 data;
1224 int err;
1225
1226 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1227
1228 data = (__u32) (unsigned long) fix->smem_start;
1229 err |= put_user(data, &fix32->smem_start);
1230
1231 err |= put_user(fix->smem_len, &fix32->smem_len);
1232 err |= put_user(fix->type, &fix32->type);
1233 err |= put_user(fix->type_aux, &fix32->type_aux);
1234 err |= put_user(fix->visual, &fix32->visual);
1235 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1236 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1237 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1238 err |= put_user(fix->line_length, &fix32->line_length);
1239
1240 data = (__u32) (unsigned long) fix->mmio_start;
1241 err |= put_user(data, &fix32->mmio_start);
1242
1243 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1244 err |= put_user(fix->accel, &fix32->accel);
1245 err |= copy_to_user(fix32->reserved, fix->reserved,
1246 sizeof(fix->reserved));
1247
1248 return err;
1249 }
1250
1251 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1252 unsigned long arg)
1253 {
1254 mm_segment_t old_fs;
1255 struct fb_fix_screeninfo fix;
1256 struct fb_fix_screeninfo32 __user *fix32;
1257 int err;
1258
1259 fix32 = compat_ptr(arg);
1260
1261 old_fs = get_fs();
1262 set_fs(KERNEL_DS);
1263 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1264 set_fs(old_fs);
1265
1266 if (!err)
1267 err = do_fscreeninfo_to_user(&fix, fix32);
1268
1269 return err;
1270 }
1271
1272 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1273 unsigned long arg)
1274 {
1275 struct inode *inode = file->f_path.dentry->d_inode;
1276 int fbidx = iminor(inode);
1277 struct fb_info *info = registered_fb[fbidx];
1278 struct fb_ops *fb = info->fbops;
1279 long ret = -ENOIOCTLCMD;
1280
1281 switch(cmd) {
1282 case FBIOGET_VSCREENINFO:
1283 case FBIOPUT_VSCREENINFO:
1284 case FBIOPAN_DISPLAY:
1285 case FBIOGET_CON2FBMAP:
1286 case FBIOPUT_CON2FBMAP:
1287 arg = (unsigned long) compat_ptr(arg);
1288 case FBIOBLANK:
1289 ret = do_fb_ioctl(info, cmd, arg);
1290 break;
1291
1292 case FBIOGET_FSCREENINFO:
1293 ret = fb_get_fscreeninfo(info, cmd, arg);
1294 break;
1295
1296 case FBIOGETCMAP:
1297 case FBIOPUTCMAP:
1298 ret = fb_getput_cmap(info, cmd, arg);
1299 break;
1300
1301 default:
1302 if (fb->fb_compat_ioctl)
1303 ret = fb->fb_compat_ioctl(info, cmd, arg);
1304 break;
1305 }
1306 return ret;
1307 }
1308 #endif
1309
1310 static int
1311 fb_mmap(struct file *file, struct vm_area_struct * vma)
1312 {
1313 int fbidx = iminor(file->f_path.dentry->d_inode);
1314 struct fb_info *info = registered_fb[fbidx];
1315 struct fb_ops *fb = info->fbops;
1316 unsigned long off;
1317 unsigned long start;
1318 u32 len;
1319
1320 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1321 return -EINVAL;
1322 off = vma->vm_pgoff << PAGE_SHIFT;
1323 if (!fb)
1324 return -ENODEV;
1325 mutex_lock(&info->mm_lock);
1326 if (fb->fb_mmap) {
1327 int res;
1328 res = fb->fb_mmap(info, vma);
1329 mutex_unlock(&info->mm_lock);
1330 return res;
1331 }
1332
1333 /* frame buffer memory */
1334 start = info->fix.smem_start;
1335 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1336 if (off >= len) {
1337 /* memory mapped io */
1338 off -= len;
1339 if (info->var.accel_flags) {
1340 mutex_unlock(&info->mm_lock);
1341 return -EINVAL;
1342 }
1343 start = info->fix.mmio_start;
1344 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1345 }
1346 mutex_unlock(&info->mm_lock);
1347 start &= PAGE_MASK;
1348 if ((vma->vm_end - vma->vm_start + off) > len)
1349 return -EINVAL;
1350 off += start;
1351 vma->vm_pgoff = off >> PAGE_SHIFT;
1352 /* This is an IO map - tell maydump to skip this VMA */
1353 vma->vm_flags |= VM_IO | VM_RESERVED;
1354 fb_pgprotect(file, vma, off);
1355 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1356 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1357 return -EAGAIN;
1358 return 0;
1359 }
1360
1361 static int
1362 fb_open(struct inode *inode, struct file *file)
1363 __acquires(&info->lock)
1364 __releases(&info->lock)
1365 {
1366 int fbidx = iminor(inode);
1367 struct fb_info *info;
1368 int res = 0;
1369
1370 if (fbidx >= FB_MAX)
1371 return -ENODEV;
1372 info = registered_fb[fbidx];
1373 if (!info)
1374 request_module("fb%d", fbidx);
1375 info = registered_fb[fbidx];
1376 if (!info)
1377 return -ENODEV;
1378 mutex_lock(&info->lock);
1379 if (!try_module_get(info->fbops->owner)) {
1380 res = -ENODEV;
1381 goto out;
1382 }
1383 file->private_data = info;
1384 if (info->fbops->fb_open) {
1385 res = info->fbops->fb_open(info,1);
1386 if (res)
1387 module_put(info->fbops->owner);
1388 }
1389 #ifdef CONFIG_FB_DEFERRED_IO
1390 if (info->fbdefio)
1391 fb_deferred_io_open(info, inode, file);
1392 #endif
1393 out:
1394 mutex_unlock(&info->lock);
1395 return res;
1396 }
1397
1398 static int
1399 fb_release(struct inode *inode, struct file *file)
1400 __acquires(&info->lock)
1401 __releases(&info->lock)
1402 {
1403 struct fb_info * const info = file->private_data;
1404
1405 mutex_lock(&info->lock);
1406 if (info->fbops->fb_release)
1407 info->fbops->fb_release(info,1);
1408 module_put(info->fbops->owner);
1409 mutex_unlock(&info->lock);
1410 return 0;
1411 }
1412
1413 static const struct file_operations fb_fops = {
1414 .owner = THIS_MODULE,
1415 .read = fb_read,
1416 .write = fb_write,
1417 .unlocked_ioctl = fb_ioctl,
1418 #ifdef CONFIG_COMPAT
1419 .compat_ioctl = fb_compat_ioctl,
1420 #endif
1421 .mmap = fb_mmap,
1422 .open = fb_open,
1423 .release = fb_release,
1424 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1425 .get_unmapped_area = get_fb_unmapped_area,
1426 #endif
1427 #ifdef CONFIG_FB_DEFERRED_IO
1428 .fsync = fb_deferred_io_fsync,
1429 #endif
1430 };
1431
1432 struct class *fb_class;
1433 EXPORT_SYMBOL(fb_class);
1434
1435 static int fb_check_foreignness(struct fb_info *fi)
1436 {
1437 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1438
1439 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1440
1441 #ifdef __BIG_ENDIAN
1442 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1443 #else
1444 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1445 #endif /* __BIG_ENDIAN */
1446
1447 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1448 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1449 "support this framebuffer\n", fi->fix.id);
1450 return -ENOSYS;
1451 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1452 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1453 "support this framebuffer\n", fi->fix.id);
1454 return -ENOSYS;
1455 }
1456
1457 return 0;
1458 }
1459
1460 static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
1461 {
1462 /* is the generic aperture base the same as the HW one */
1463 if (gen->aperture_base == hw->aperture_base)
1464 return true;
1465 /* is the generic aperture base inside the hw base->hw base+size */
1466 if (gen->aperture_base > hw->aperture_base && gen->aperture_base <= hw->aperture_base + hw->aperture_size)
1467 return true;
1468 return false;
1469 }
1470 /**
1471 * register_framebuffer - registers a frame buffer device
1472 * @fb_info: frame buffer info structure
1473 *
1474 * Registers a frame buffer device @fb_info.
1475 *
1476 * Returns negative errno on error, or zero for success.
1477 *
1478 */
1479
1480 int
1481 register_framebuffer(struct fb_info *fb_info)
1482 {
1483 int i;
1484 struct fb_event event;
1485 struct fb_videomode mode;
1486
1487 if (num_registered_fb == FB_MAX)
1488 return -ENXIO;
1489
1490 if (fb_check_foreignness(fb_info))
1491 return -ENOSYS;
1492
1493 /* check all firmware fbs and kick off if the base addr overlaps */
1494 for (i = 0 ; i < FB_MAX; i++) {
1495 if (!registered_fb[i])
1496 continue;
1497
1498 if (registered_fb[i]->flags & FBINFO_MISC_FIRMWARE) {
1499 if (fb_do_apertures_overlap(registered_fb[i], fb_info)) {
1500 printk(KERN_ERR "fb: conflicting fb hw usage "
1501 "%s vs %s - removing generic driver\n",
1502 fb_info->fix.id,
1503 registered_fb[i]->fix.id);
1504 unregister_framebuffer(registered_fb[i]);
1505 break;
1506 }
1507 }
1508 }
1509
1510 num_registered_fb++;
1511 for (i = 0 ; i < FB_MAX; i++)
1512 if (!registered_fb[i])
1513 break;
1514 fb_info->node = i;
1515 mutex_init(&fb_info->lock);
1516 mutex_init(&fb_info->mm_lock);
1517
1518 fb_info->dev = device_create(fb_class, fb_info->device,
1519 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1520 if (IS_ERR(fb_info->dev)) {
1521 /* Not fatal */
1522 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1523 fb_info->dev = NULL;
1524 } else
1525 fb_init_device(fb_info);
1526
1527 if (fb_info->pixmap.addr == NULL) {
1528 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1529 if (fb_info->pixmap.addr) {
1530 fb_info->pixmap.size = FBPIXMAPSIZE;
1531 fb_info->pixmap.buf_align = 1;
1532 fb_info->pixmap.scan_align = 1;
1533 fb_info->pixmap.access_align = 32;
1534 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1535 }
1536 }
1537 fb_info->pixmap.offset = 0;
1538
1539 if (!fb_info->pixmap.blit_x)
1540 fb_info->pixmap.blit_x = ~(u32)0;
1541
1542 if (!fb_info->pixmap.blit_y)
1543 fb_info->pixmap.blit_y = ~(u32)0;
1544
1545 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1546 INIT_LIST_HEAD(&fb_info->modelist);
1547
1548 fb_var_to_videomode(&mode, &fb_info->var);
1549 fb_add_videomode(&mode, &fb_info->modelist);
1550 registered_fb[i] = fb_info;
1551
1552 event.info = fb_info;
1553 if (!lock_fb_info(fb_info))
1554 return -ENODEV;
1555 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1556 unlock_fb_info(fb_info);
1557 return 0;
1558 }
1559
1560
1561 /**
1562 * unregister_framebuffer - releases a frame buffer device
1563 * @fb_info: frame buffer info structure
1564 *
1565 * Unregisters a frame buffer device @fb_info.
1566 *
1567 * Returns negative errno on error, or zero for success.
1568 *
1569 * This function will also notify the framebuffer console
1570 * to release the driver.
1571 *
1572 * This is meant to be called within a driver's module_exit()
1573 * function. If this is called outside module_exit(), ensure
1574 * that the driver implements fb_open() and fb_release() to
1575 * check that no processes are using the device.
1576 */
1577
1578 int
1579 unregister_framebuffer(struct fb_info *fb_info)
1580 {
1581 struct fb_event event;
1582 int i, ret = 0;
1583
1584 i = fb_info->node;
1585 if (!registered_fb[i]) {
1586 ret = -EINVAL;
1587 goto done;
1588 }
1589
1590
1591 if (!lock_fb_info(fb_info))
1592 return -ENODEV;
1593 event.info = fb_info;
1594 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1595 unlock_fb_info(fb_info);
1596
1597 if (ret) {
1598 ret = -EINVAL;
1599 goto done;
1600 }
1601
1602 if (fb_info->pixmap.addr &&
1603 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1604 kfree(fb_info->pixmap.addr);
1605 fb_destroy_modelist(&fb_info->modelist);
1606 registered_fb[i]=NULL;
1607 num_registered_fb--;
1608 fb_cleanup_device(fb_info);
1609 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1610 event.info = fb_info;
1611 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1612
1613 /* this may free fb info */
1614 if (fb_info->fbops->fb_destroy)
1615 fb_info->fbops->fb_destroy(fb_info);
1616 done:
1617 return ret;
1618 }
1619
1620 /**
1621 * fb_set_suspend - low level driver signals suspend
1622 * @info: framebuffer affected
1623 * @state: 0 = resuming, !=0 = suspending
1624 *
1625 * This is meant to be used by low level drivers to
1626 * signal suspend/resume to the core & clients.
1627 * It must be called with the console semaphore held
1628 */
1629 void fb_set_suspend(struct fb_info *info, int state)
1630 {
1631 struct fb_event event;
1632
1633 if (!lock_fb_info(info))
1634 return;
1635 event.info = info;
1636 if (state) {
1637 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1638 info->state = FBINFO_STATE_SUSPENDED;
1639 } else {
1640 info->state = FBINFO_STATE_RUNNING;
1641 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1642 }
1643 unlock_fb_info(info);
1644 }
1645
1646 /**
1647 * fbmem_init - init frame buffer subsystem
1648 *
1649 * Initialize the frame buffer subsystem.
1650 *
1651 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1652 *
1653 */
1654
1655 static int __init
1656 fbmem_init(void)
1657 {
1658 proc_create("fb", 0, NULL, &fb_proc_fops);
1659
1660 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1661 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1662
1663 fb_class = class_create(THIS_MODULE, "graphics");
1664 if (IS_ERR(fb_class)) {
1665 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1666 fb_class = NULL;
1667 }
1668 return 0;
1669 }
1670
1671 #ifdef MODULE
1672 module_init(fbmem_init);
1673 static void __exit
1674 fbmem_exit(void)
1675 {
1676 remove_proc_entry("fb", NULL);
1677 class_destroy(fb_class);
1678 unregister_chrdev(FB_MAJOR, "fb");
1679 }
1680
1681 module_exit(fbmem_exit);
1682 MODULE_LICENSE("GPL");
1683 MODULE_DESCRIPTION("Framebuffer base");
1684 #else
1685 subsys_initcall(fbmem_init);
1686 #endif
1687
1688 int fb_new_modelist(struct fb_info *info)
1689 {
1690 struct fb_event event;
1691 struct fb_var_screeninfo var = info->var;
1692 struct list_head *pos, *n;
1693 struct fb_modelist *modelist;
1694 struct fb_videomode *m, mode;
1695 int err = 1;
1696
1697 list_for_each_safe(pos, n, &info->modelist) {
1698 modelist = list_entry(pos, struct fb_modelist, list);
1699 m = &modelist->mode;
1700 fb_videomode_to_var(&var, m);
1701 var.activate = FB_ACTIVATE_TEST;
1702 err = fb_set_var(info, &var);
1703 fb_var_to_videomode(&mode, &var);
1704 if (err || !fb_mode_is_equal(m, &mode)) {
1705 list_del(pos);
1706 kfree(pos);
1707 }
1708 }
1709
1710 err = 1;
1711
1712 if (!list_empty(&info->modelist)) {
1713 if (!lock_fb_info(info))
1714 return -ENODEV;
1715 event.info = info;
1716 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1717 unlock_fb_info(info);
1718 }
1719
1720 return err;
1721 }
1722
1723 static char *video_options[FB_MAX] __read_mostly;
1724 static int ofonly __read_mostly;
1725
1726 /**
1727 * fb_get_options - get kernel boot parameters
1728 * @name: framebuffer name as it would appear in
1729 * the boot parameter line
1730 * (video=<name>:<options>)
1731 * @option: the option will be stored here
1732 *
1733 * NOTE: Needed to maintain backwards compatibility
1734 */
1735 int fb_get_options(char *name, char **option)
1736 {
1737 char *opt, *options = NULL;
1738 int opt_len, retval = 0;
1739 int name_len = strlen(name), i;
1740
1741 if (name_len && ofonly && strncmp(name, "offb", 4))
1742 retval = 1;
1743
1744 if (name_len && !retval) {
1745 for (i = 0; i < FB_MAX; i++) {
1746 if (video_options[i] == NULL)
1747 continue;
1748 opt_len = strlen(video_options[i]);
1749 if (!opt_len)
1750 continue;
1751 opt = video_options[i];
1752 if (!strncmp(name, opt, name_len) &&
1753 opt[name_len] == ':')
1754 options = opt + name_len + 1;
1755 }
1756 }
1757 if (options && !strncmp(options, "off", 3))
1758 retval = 1;
1759
1760 if (option)
1761 *option = options;
1762
1763 return retval;
1764 }
1765
1766 #ifndef MODULE
1767 /**
1768 * video_setup - process command line options
1769 * @options: string of options
1770 *
1771 * Process command line options for frame buffer subsystem.
1772 *
1773 * NOTE: This function is a __setup and __init function.
1774 * It only stores the options. Drivers have to call
1775 * fb_get_options() as necessary.
1776 *
1777 * Returns zero.
1778 *
1779 */
1780 static int __init video_setup(char *options)
1781 {
1782 int i, global = 0;
1783
1784 if (!options || !*options)
1785 global = 1;
1786
1787 if (!global && !strncmp(options, "ofonly", 6)) {
1788 ofonly = 1;
1789 global = 1;
1790 }
1791
1792 if (!global && !strstr(options, "fb:")) {
1793 fb_mode_option = options;
1794 global = 1;
1795 }
1796
1797 if (!global) {
1798 for (i = 0; i < FB_MAX; i++) {
1799 if (video_options[i] == NULL) {
1800 video_options[i] = options;
1801 break;
1802 }
1803
1804 }
1805 }
1806
1807 return 1;
1808 }
1809 __setup("video=", video_setup);
1810 #endif
1811
1812 /*
1813 * Visible symbols for modules
1814 */
1815
1816 EXPORT_SYMBOL(register_framebuffer);
1817 EXPORT_SYMBOL(unregister_framebuffer);
1818 EXPORT_SYMBOL(num_registered_fb);
1819 EXPORT_SYMBOL(registered_fb);
1820 EXPORT_SYMBOL(fb_show_logo);
1821 EXPORT_SYMBOL(fb_set_var);
1822 EXPORT_SYMBOL(fb_blank);
1823 EXPORT_SYMBOL(fb_pan_display);
1824 EXPORT_SYMBOL(fb_get_buffer_offset);
1825 EXPORT_SYMBOL(fb_set_suspend);
1826 EXPORT_SYMBOL(fb_get_options);
1827
1828 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards