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Revert "radeonfb: accelerate imageblit and other improvements"
[linux-2.6/kvm.git] / drivers / video / fbmem.c
blob3c65b0d676174f6ee683a0516700324a0cb4cc17
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 #include <linux/kmod.h>
32 #include <linux/err.h>
33 #include <linux/device.h>
34 #include <linux/efi.h>
35 #include <linux/fb.h>
36
37 #include <asm/fb.h>
38
39
40 /*
41 * Frame buffer device initialization and setup routines
42 */
43
44 #define FBPIXMAPSIZE (1024 * 8)
45
46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
47 int num_registered_fb __read_mostly;
48
49 /*
50 * Helpers
51 */
52
53 int fb_get_color_depth(struct fb_var_screeninfo *var,
54 struct fb_fix_screeninfo *fix)
55 {
56 int depth = 0;
57
58 if (fix->visual == FB_VISUAL_MONO01 ||
59 fix->visual == FB_VISUAL_MONO10)
60 depth = 1;
61 else {
62 if (var->green.length == var->blue.length &&
63 var->green.length == var->red.length &&
64 var->green.offset == var->blue.offset &&
65 var->green.offset == var->red.offset)
66 depth = var->green.length;
67 else
68 depth = var->green.length + var->red.length +
69 var->blue.length;
70 }
71
72 return depth;
73 }
74 EXPORT_SYMBOL(fb_get_color_depth);
75
76 /*
77 * Data padding functions.
78 */
79 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
80 {
81 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
82 }
83 EXPORT_SYMBOL(fb_pad_aligned_buffer);
84
85 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
86 u32 shift_high, u32 shift_low, u32 mod)
87 {
88 u8 mask = (u8) (0xfff << shift_high), tmp;
89 int i, j;
90
91 for (i = height; i--; ) {
92 for (j = 0; j < idx; j++) {
93 tmp = dst[j];
94 tmp &= mask;
95 tmp |= *src >> shift_low;
96 dst[j] = tmp;
97 tmp = *src << shift_high;
98 dst[j+1] = tmp;
99 src++;
100 }
101 tmp = dst[idx];
102 tmp &= mask;
103 tmp |= *src >> shift_low;
104 dst[idx] = tmp;
105 if (shift_high < mod) {
106 tmp = *src << shift_high;
107 dst[idx+1] = tmp;
108 }
109 src++;
110 dst += d_pitch;
111 }
112 }
113 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
114
115 /*
116 * we need to lock this section since fb_cursor
117 * may use fb_imageblit()
118 */
119 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
120 {
121 u32 align = buf->buf_align - 1, offset;
122 char *addr = buf->addr;
123
124 /* If IO mapped, we need to sync before access, no sharing of
125 * the pixmap is done
126 */
127 if (buf->flags & FB_PIXMAP_IO) {
128 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
129 info->fbops->fb_sync(info);
130 return addr;
131 }
132
133 /* See if we fit in the remaining pixmap space */
134 offset = buf->offset + align;
135 offset &= ~align;
136 if (offset + size > buf->size) {
137 /* We do not fit. In order to be able to re-use the buffer,
138 * we must ensure no asynchronous DMA'ing or whatever operation
139 * is in progress, we sync for that.
140 */
141 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142 info->fbops->fb_sync(info);
143 offset = 0;
144 }
145 buf->offset = offset + size;
146 addr += offset;
147
148 return addr;
149 }
150
151 #ifdef CONFIG_LOGO
152
153 static inline unsigned safe_shift(unsigned d, int n)
154 {
155 return n < 0 ? d >> -n : d << n;
156 }
157
158 static void fb_set_logocmap(struct fb_info *info,
159 const struct linux_logo *logo)
160 {
161 struct fb_cmap palette_cmap;
162 u16 palette_green[16];
163 u16 palette_blue[16];
164 u16 palette_red[16];
165 int i, j, n;
166 const unsigned char *clut = logo->clut;
167
168 palette_cmap.start = 0;
169 palette_cmap.len = 16;
170 palette_cmap.red = palette_red;
171 palette_cmap.green = palette_green;
172 palette_cmap.blue = palette_blue;
173 palette_cmap.transp = NULL;
174
175 for (i = 0; i < logo->clutsize; i += n) {
176 n = logo->clutsize - i;
177 /* palette_cmap provides space for only 16 colors at once */
178 if (n > 16)
179 n = 16;
180 palette_cmap.start = 32 + i;
181 palette_cmap.len = n;
182 for (j = 0; j < n; ++j) {
183 palette_cmap.red[j] = clut[0] << 8 | clut[0];
184 palette_cmap.green[j] = clut[1] << 8 | clut[1];
185 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
186 clut += 3;
187 }
188 fb_set_cmap(&palette_cmap, info);
189 }
190 }
191
192 static void fb_set_logo_truepalette(struct fb_info *info,
193 const struct linux_logo *logo,
194 u32 *palette)
195 {
196 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
197 unsigned char redmask, greenmask, bluemask;
198 int redshift, greenshift, blueshift;
199 int i;
200 const unsigned char *clut = logo->clut;
201
202 /*
203 * We have to create a temporary palette since console palette is only
204 * 16 colors long.
205 */
206 /* Bug: Doesn't obey msb_right ... (who needs that?) */
207 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
208 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
209 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
210 redshift = info->var.red.offset - (8 - info->var.red.length);
211 greenshift = info->var.green.offset - (8 - info->var.green.length);
212 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
213
214 for ( i = 0; i < logo->clutsize; i++) {
215 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
216 safe_shift((clut[1] & greenmask), greenshift) |
217 safe_shift((clut[2] & bluemask), blueshift));
218 clut += 3;
219 }
220 }
221
222 static void fb_set_logo_directpalette(struct fb_info *info,
223 const struct linux_logo *logo,
224 u32 *palette)
225 {
226 int redshift, greenshift, blueshift;
227 int i;
228
229 redshift = info->var.red.offset;
230 greenshift = info->var.green.offset;
231 blueshift = info->var.blue.offset;
232
233 for (i = 32; i < 32 + logo->clutsize; i++)
234 palette[i] = i << redshift | i << greenshift | i << blueshift;
235 }
236
237 static void fb_set_logo(struct fb_info *info,
238 const struct linux_logo *logo, u8 *dst,
239 int depth)
240 {
241 int i, j, k;
242 const u8 *src = logo->data;
243 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
244 u8 fg = 1, d;
245
246 switch (fb_get_color_depth(&info->var, &info->fix)) {
247 case 1:
248 fg = 1;
249 break;
250 case 2:
251 fg = 3;
252 break;
253 default:
254 fg = 7;
255 break;
256 }
257
258 if (info->fix.visual == FB_VISUAL_MONO01 ||
259 info->fix.visual == FB_VISUAL_MONO10)
260 fg = ~((u8) (0xfff << info->var.green.length));
261
262 switch (depth) {
263 case 4:
264 for (i = 0; i < logo->height; i++)
265 for (j = 0; j < logo->width; src++) {
266 *dst++ = *src >> 4;
267 j++;
268 if (j < logo->width) {
269 *dst++ = *src & 0x0f;
270 j++;
271 }
272 }
273 break;
274 case 1:
275 for (i = 0; i < logo->height; i++) {
276 for (j = 0; j < logo->width; src++) {
277 d = *src ^ xor;
278 for (k = 7; k >= 0; k--) {
279 *dst++ = ((d >> k) & 1) ? fg : 0;
280 j++;
281 }
282 }
283 }
284 break;
285 }
286 }
287
288 /*
289 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
290 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
291 * the visual format and color depth of the framebuffer, the DAC, the
292 * pseudo_palette, and the logo data will be adjusted accordingly.
293 *
294 * Case 1 - linux_logo_clut224:
295 * Color exceeds the number of console colors (16), thus we set the hardware DAC
296 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
297 *
298 * For visuals that require color info from the pseudo_palette, we also construct
299 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
300 * will be set.
301 *
302 * Case 2 - linux_logo_vga16:
303 * The number of colors just matches the console colors, thus there is no need
304 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
305 * each byte contains color information for two pixels (upper and lower nibble).
306 * To be consistent with fb_imageblit() usage, we therefore separate the two
307 * nibbles into separate bytes. The "depth" flag will be set to 4.
308 *
309 * Case 3 - linux_logo_mono:
310 * This is similar with Case 2. Each byte contains information for 8 pixels.
311 * We isolate each bit and expand each into a byte. The "depth" flag will
312 * be set to 1.
313 */
314 static struct logo_data {
315 int depth;
316 int needs_directpalette;
317 int needs_truepalette;
318 int needs_cmapreset;
319 const struct linux_logo *logo;
320 } fb_logo __read_mostly;
321
322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
323 {
324 u32 size = width * height, i;
325
326 out += size - 1;
327
328 for (i = size; i--; )
329 *out-- = *in++;
330 }
331
332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334 int i, j, h = height - 1;
335
336 for (i = 0; i < height; i++)
337 for (j = 0; j < width; j++)
338 out[height * j + h - i] = *in++;
339 }
340
341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
342 {
343 int i, j, w = width - 1;
344
345 for (i = 0; i < height; i++)
346 for (j = 0; j < width; j++)
347 out[height * (w - j) + i] = *in++;
348 }
349
350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
351 struct fb_image *image, int rotate)
352 {
353 u32 tmp;
354
355 if (rotate == FB_ROTATE_UD) {
356 fb_rotate_logo_ud(image->data, dst, image->width,
357 image->height);
358 image->dx = info->var.xres - image->width - image->dx;
359 image->dy = info->var.yres - image->height - image->dy;
360 } else if (rotate == FB_ROTATE_CW) {
361 fb_rotate_logo_cw(image->data, dst, image->width,
362 image->height);
363 tmp = image->width;
364 image->width = image->height;
365 image->height = tmp;
366 tmp = image->dy;
367 image->dy = image->dx;
368 image->dx = info->var.xres - image->width - tmp;
369 } else if (rotate == FB_ROTATE_CCW) {
370 fb_rotate_logo_ccw(image->data, dst, image->width,
371 image->height);
372 tmp = image->width;
373 image->width = image->height;
374 image->height = tmp;
375 tmp = image->dx;
376 image->dx = image->dy;
377 image->dy = info->var.yres - image->height - tmp;
378 }
379
380 image->data = dst;
381 }
382
383 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
384 int rotate, unsigned int num)
385 {
386 unsigned int x;
387
388 if (rotate == FB_ROTATE_UR) {
389 for (x = 0;
390 x < num && image->dx + image->width <= info->var.xres;
391 x++) {
392 info->fbops->fb_imageblit(info, image);
393 image->dx += image->width + 8;
394 }
395 } else if (rotate == FB_ROTATE_UD) {
396 for (x = 0; x < num && image->dx >= 0; x++) {
397 info->fbops->fb_imageblit(info, image);
398 image->dx -= image->width + 8;
399 }
400 } else if (rotate == FB_ROTATE_CW) {
401 for (x = 0;
402 x < num && image->dy + image->height <= info->var.yres;
403 x++) {
404 info->fbops->fb_imageblit(info, image);
405 image->dy += image->height + 8;
406 }
407 } else if (rotate == FB_ROTATE_CCW) {
408 for (x = 0; x < num && image->dy >= 0; x++) {
409 info->fbops->fb_imageblit(info, image);
410 image->dy -= image->height + 8;
411 }
412 }
413 }
414
415 static int fb_show_logo_line(struct fb_info *info, int rotate,
416 const struct linux_logo *logo, int y,
417 unsigned int n)
418 {
419 u32 *palette = NULL, *saved_pseudo_palette = NULL;
420 unsigned char *logo_new = NULL, *logo_rotate = NULL;
421 struct fb_image image;
422
423 /* Return if the frame buffer is not mapped or suspended */
424 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
425 info->flags & FBINFO_MODULE)
426 return 0;
427
428 image.depth = 8;
429 image.data = logo->data;
430
431 if (fb_logo.needs_cmapreset)
432 fb_set_logocmap(info, logo);
433
434 if (fb_logo.needs_truepalette ||
435 fb_logo.needs_directpalette) {
436 palette = kmalloc(256 * 4, GFP_KERNEL);
437 if (palette == NULL)
438 return 0;
439
440 if (fb_logo.needs_truepalette)
441 fb_set_logo_truepalette(info, logo, palette);
442 else
443 fb_set_logo_directpalette(info, logo, palette);
444
445 saved_pseudo_palette = info->pseudo_palette;
446 info->pseudo_palette = palette;
447 }
448
449 if (fb_logo.depth <= 4) {
450 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
451 if (logo_new == NULL) {
452 kfree(palette);
453 if (saved_pseudo_palette)
454 info->pseudo_palette = saved_pseudo_palette;
455 return 0;
456 }
457 image.data = logo_new;
458 fb_set_logo(info, logo, logo_new, fb_logo.depth);
459 }
460
461 image.dx = 0;
462 image.dy = y;
463 image.width = logo->width;
464 image.height = logo->height;
465
466 if (rotate) {
467 logo_rotate = kmalloc(logo->width *
468 logo->height, GFP_KERNEL);
469 if (logo_rotate)
470 fb_rotate_logo(info, logo_rotate, &image, rotate);
471 }
472
473 fb_do_show_logo(info, &image, rotate, n);
474
475 kfree(palette);
476 if (saved_pseudo_palette != NULL)
477 info->pseudo_palette = saved_pseudo_palette;
478 kfree(logo_new);
479 kfree(logo_rotate);
480 return logo->height;
481 }
482
483
484 #ifdef CONFIG_FB_LOGO_EXTRA
485
486 #define FB_LOGO_EX_NUM_MAX 10
487 static struct logo_data_extra {
488 const struct linux_logo *logo;
489 unsigned int n;
490 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
491 static unsigned int fb_logo_ex_num;
492
493 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
494 {
495 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
496 return;
497
498 fb_logo_ex[fb_logo_ex_num].logo = logo;
499 fb_logo_ex[fb_logo_ex_num].n = n;
500 fb_logo_ex_num++;
501 }
502
503 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
504 unsigned int yres)
505 {
506 unsigned int i;
507
508 /* FIXME: logo_ex supports only truecolor fb. */
509 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
510 fb_logo_ex_num = 0;
511
512 for (i = 0; i < fb_logo_ex_num; i++) {
513 height += fb_logo_ex[i].logo->height;
514 if (height > yres) {
515 height -= fb_logo_ex[i].logo->height;
516 fb_logo_ex_num = i;
517 break;
518 }
519 }
520 return height;
521 }
522
523 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
524 {
525 unsigned int i;
526
527 for (i = 0; i < fb_logo_ex_num; i++)
528 y += fb_show_logo_line(info, rotate,
529 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
530
531 return y;
532 }
533
534 #else /* !CONFIG_FB_LOGO_EXTRA */
535
536 static inline int fb_prepare_extra_logos(struct fb_info *info,
537 unsigned int height,
538 unsigned int yres)
539 {
540 return height;
541 }
542
543 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
544 {
545 return y;
546 }
547
548 #endif /* CONFIG_FB_LOGO_EXTRA */
549
550
551 int fb_prepare_logo(struct fb_info *info, int rotate)
552 {
553 int depth = fb_get_color_depth(&info->var, &info->fix);
554 unsigned int yres;
555
556 memset(&fb_logo, 0, sizeof(struct logo_data));
557
558 if (info->flags & FBINFO_MISC_TILEBLITTING ||
559 info->flags & FBINFO_MODULE)
560 return 0;
561
562 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
563 depth = info->var.blue.length;
564 if (info->var.red.length < depth)
565 depth = info->var.red.length;
566 if (info->var.green.length < depth)
567 depth = info->var.green.length;
568 }
569
570 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
571 /* assume console colormap */
572 depth = 4;
573 }
574
575 /* Return if no suitable logo was found */
576 fb_logo.logo = fb_find_logo(depth);
577
578 if (!fb_logo.logo) {
579 return 0;
580 }
581
582 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
583 yres = info->var.yres;
584 else
585 yres = info->var.xres;
586
587 if (fb_logo.logo->height > yres) {
588 fb_logo.logo = NULL;
589 return 0;
590 }
591
592 /* What depth we asked for might be different from what we get */
593 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
594 fb_logo.depth = 8;
595 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
596 fb_logo.depth = 4;
597 else
598 fb_logo.depth = 1;
599
600
601 if (fb_logo.depth > 4 && depth > 4) {
602 switch (info->fix.visual) {
603 case FB_VISUAL_TRUECOLOR:
604 fb_logo.needs_truepalette = 1;
605 break;
606 case FB_VISUAL_DIRECTCOLOR:
607 fb_logo.needs_directpalette = 1;
608 fb_logo.needs_cmapreset = 1;
609 break;
610 case FB_VISUAL_PSEUDOCOLOR:
611 fb_logo.needs_cmapreset = 1;
612 break;
613 }
614 }
615
616 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
617 }
618
619 int fb_show_logo(struct fb_info *info, int rotate)
620 {
621 int y;
622
623 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
624 num_online_cpus());
625 y = fb_show_extra_logos(info, y, rotate);
626
627 return y;
628 }
629 #else
630 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
631 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
632 #endif /* CONFIG_LOGO */
633
634 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
635 {
636 return (*pos < FB_MAX) ? pos : NULL;
637 }
638
639 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
640 {
641 (*pos)++;
642 return (*pos < FB_MAX) ? pos : NULL;
643 }
644
645 static void fb_seq_stop(struct seq_file *m, void *v)
646 {
647 }
648
649 static int fb_seq_show(struct seq_file *m, void *v)
650 {
651 int i = *(loff_t *)v;
652 struct fb_info *fi = registered_fb[i];
653
654 if (fi)
655 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
656 return 0;
657 }
658
659 static const struct seq_operations proc_fb_seq_ops = {
660 .start = fb_seq_start,
661 .next = fb_seq_next,
662 .stop = fb_seq_stop,
663 .show = fb_seq_show,
664 };
665
666 static int proc_fb_open(struct inode *inode, struct file *file)
667 {
668 return seq_open(file, &proc_fb_seq_ops);
669 }
670
671 static const struct file_operations fb_proc_fops = {
672 .owner = THIS_MODULE,
673 .open = proc_fb_open,
674 .read = seq_read,
675 .llseek = seq_lseek,
676 .release = seq_release,
677 };
678
679 static ssize_t
680 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
681 {
682 unsigned long p = *ppos;
683 struct inode *inode = file->f_path.dentry->d_inode;
684 int fbidx = iminor(inode);
685 struct fb_info *info = registered_fb[fbidx];
686 u32 *buffer, *dst;
687 u32 __iomem *src;
688 int c, i, cnt = 0, err = 0;
689 unsigned long total_size;
690
691 if (!info || ! info->screen_base)
692 return -ENODEV;
693
694 if (info->state != FBINFO_STATE_RUNNING)
695 return -EPERM;
696
697 if (info->fbops->fb_read)
698 return info->fbops->fb_read(info, buf, count, ppos);
699
700 total_size = info->screen_size;
701
702 if (total_size == 0)
703 total_size = info->fix.smem_len;
704
705 if (p >= total_size)
706 return 0;
707
708 if (count >= total_size)
709 count = total_size;
710
711 if (count + p > total_size)
712 count = total_size - p;
713
714 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
715 GFP_KERNEL);
716 if (!buffer)
717 return -ENOMEM;
718
719 src = (u32 __iomem *) (info->screen_base + p);
720
721 if (info->fbops->fb_sync)
722 info->fbops->fb_sync(info);
723
724 while (count) {
725 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
726 dst = buffer;
727 for (i = c >> 2; i--; )
728 *dst++ = fb_readl(src++);
729 if (c & 3) {
730 u8 *dst8 = (u8 *) dst;
731 u8 __iomem *src8 = (u8 __iomem *) src;
732
733 for (i = c & 3; i--;)
734 *dst8++ = fb_readb(src8++);
735
736 src = (u32 __iomem *) src8;
737 }
738
739 if (copy_to_user(buf, buffer, c)) {
740 err = -EFAULT;
741 break;
742 }
743 *ppos += c;
744 buf += c;
745 cnt += c;
746 count -= c;
747 }
748
749 kfree(buffer);
750
751 return (err) ? err : cnt;
752 }
753
754 static ssize_t
755 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
756 {
757 unsigned long p = *ppos;
758 struct inode *inode = file->f_path.dentry->d_inode;
759 int fbidx = iminor(inode);
760 struct fb_info *info = registered_fb[fbidx];
761 u32 *buffer, *src;
762 u32 __iomem *dst;
763 int c, i, cnt = 0, err = 0;
764 unsigned long total_size;
765
766 if (!info || !info->screen_base)
767 return -ENODEV;
768
769 if (info->state != FBINFO_STATE_RUNNING)
770 return -EPERM;
771
772 if (info->fbops->fb_write)
773 return info->fbops->fb_write(info, buf, count, ppos);
774
775 total_size = info->screen_size;
776
777 if (total_size == 0)
778 total_size = info->fix.smem_len;
779
780 if (p > total_size)
781 return -EFBIG;
782
783 if (count > total_size) {
784 err = -EFBIG;
785 count = total_size;
786 }
787
788 if (count + p > total_size) {
789 if (!err)
790 err = -ENOSPC;
791
792 count = total_size - p;
793 }
794
795 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
796 GFP_KERNEL);
797 if (!buffer)
798 return -ENOMEM;
799
800 dst = (u32 __iomem *) (info->screen_base + p);
801
802 if (info->fbops->fb_sync)
803 info->fbops->fb_sync(info);
804
805 while (count) {
806 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
807 src = buffer;
808
809 if (copy_from_user(src, buf, c)) {
810 err = -EFAULT;
811 break;
812 }
813
814 for (i = c >> 2; i--; )
815 fb_writel(*src++, dst++);
816
817 if (c & 3) {
818 u8 *src8 = (u8 *) src;
819 u8 __iomem *dst8 = (u8 __iomem *) dst;
820
821 for (i = c & 3; i--; )
822 fb_writeb(*src8++, dst8++);
823
824 dst = (u32 __iomem *) dst8;
825 }
826
827 *ppos += c;
828 buf += c;
829 cnt += c;
830 count -= c;
831 }
832
833 kfree(buffer);
834
835 return (cnt) ? cnt : err;
836 }
837
838 int
839 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
840 {
841 struct fb_fix_screeninfo *fix = &info->fix;
842 unsigned int yres = info->var.yres;
843 int err = 0;
844
845 if (var->yoffset > 0) {
846 if (var->vmode & FB_VMODE_YWRAP) {
847 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
848 err = -EINVAL;
849 else
850 yres = 0;
851 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
852 err = -EINVAL;
853 }
854
855 if (var->xoffset > 0 && (!fix->xpanstep ||
856 (var->xoffset % fix->xpanstep)))
857 err = -EINVAL;
858
859 if (err || !info->fbops->fb_pan_display ||
860 var->yoffset + yres > info->var.yres_virtual ||
861 var->xoffset + info->var.xres > info->var.xres_virtual)
862 return -EINVAL;
863
864 if ((err = info->fbops->fb_pan_display(var, info)))
865 return err;
866 info->var.xoffset = var->xoffset;
867 info->var.yoffset = var->yoffset;
868 if (var->vmode & FB_VMODE_YWRAP)
869 info->var.vmode |= FB_VMODE_YWRAP;
870 else
871 info->var.vmode &= ~FB_VMODE_YWRAP;
872 return 0;
873 }
874
875 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
876 u32 activate)
877 {
878 struct fb_event event;
879 struct fb_blit_caps caps, fbcaps;
880 int err = 0;
881
882 memset(&caps, 0, sizeof(caps));
883 memset(&fbcaps, 0, sizeof(fbcaps));
884 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
885 event.info = info;
886 event.data = &caps;
887 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
888 info->fbops->fb_get_caps(info, &fbcaps, var);
889
890 if (((fbcaps.x ^ caps.x) & caps.x) ||
891 ((fbcaps.y ^ caps.y) & caps.y) ||
892 (fbcaps.len < caps.len))
893 err = -EINVAL;
894
895 return err;
896 }
897
898 int
899 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
900 {
901 int flags = info->flags;
902 int ret = 0;
903
904 if (var->activate & FB_ACTIVATE_INV_MODE) {
905 struct fb_videomode mode1, mode2;
906
907 fb_var_to_videomode(&mode1, var);
908 fb_var_to_videomode(&mode2, &info->var);
909 /* make sure we don't delete the videomode of current var */
910 ret = fb_mode_is_equal(&mode1, &mode2);
911
912 if (!ret) {
913 struct fb_event event;
914
915 event.info = info;
916 event.data = &mode1;
917 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
918 }
919
920 if (!ret)
921 fb_delete_videomode(&mode1, &info->modelist);
922
923
924 ret = (ret) ? -EINVAL : 0;
925 goto done;
926 }
927
928 if ((var->activate & FB_ACTIVATE_FORCE) ||
929 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
930 u32 activate = var->activate;
931
932 if (!info->fbops->fb_check_var) {
933 *var = info->var;
934 goto done;
935 }
936
937 ret = info->fbops->fb_check_var(var, info);
938
939 if (ret)
940 goto done;
941
942 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
943 struct fb_videomode mode;
944
945 if (info->fbops->fb_get_caps) {
946 ret = fb_check_caps(info, var, activate);
947
948 if (ret)
949 goto done;
950 }
951
952 info->var = *var;
953
954 if (info->fbops->fb_set_par)
955 info->fbops->fb_set_par(info);
956
957 fb_pan_display(info, &info->var);
958 fb_set_cmap(&info->cmap, info);
959 fb_var_to_videomode(&mode, &info->var);
960
961 if (info->modelist.prev && info->modelist.next &&
962 !list_empty(&info->modelist))
963 ret = fb_add_videomode(&mode, &info->modelist);
964
965 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
966 struct fb_event event;
967 int evnt = (activate & FB_ACTIVATE_ALL) ?
968 FB_EVENT_MODE_CHANGE_ALL :
969 FB_EVENT_MODE_CHANGE;
970
971 info->flags &= ~FBINFO_MISC_USEREVENT;
972 event.info = info;
973 event.data = &mode;
974 fb_notifier_call_chain(evnt, &event);
975 }
976 }
977 }
978
979 done:
980 return ret;
981 }
982
983 int
984 fb_blank(struct fb_info *info, int blank)
985 {
986 int ret = -EINVAL;
987
988 if (blank > FB_BLANK_POWERDOWN)
989 blank = FB_BLANK_POWERDOWN;
990
991 if (info->fbops->fb_blank)
992 ret = info->fbops->fb_blank(blank, info);
993
994 if (!ret) {
995 struct fb_event event;
996
997 event.info = info;
998 event.data = &blank;
999 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1000 }
1001
1002 return ret;
1003 }
1004
1005 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1006 unsigned long arg)
1007 {
1008 struct fb_ops *fb;
1009 struct fb_var_screeninfo var;
1010 struct fb_fix_screeninfo fix;
1011 struct fb_con2fbmap con2fb;
1012 struct fb_cmap_user cmap;
1013 struct fb_event event;
1014 void __user *argp = (void __user *)arg;
1015 long ret = 0;
1016
1017 fb = info->fbops;
1018 if (!fb)
1019 return -ENODEV;
1020
1021 switch (cmd) {
1022 case FBIOGET_VSCREENINFO:
1023 ret = copy_to_user(argp, &info->var,
1024 sizeof(var)) ? -EFAULT : 0;
1025 break;
1026 case FBIOPUT_VSCREENINFO:
1027 if (copy_from_user(&var, argp, sizeof(var))) {
1028 ret = -EFAULT;
1029 break;
1030 }
1031 acquire_console_sem();
1032 info->flags |= FBINFO_MISC_USEREVENT;
1033 ret = fb_set_var(info, &var);
1034 info->flags &= ~FBINFO_MISC_USEREVENT;
1035 release_console_sem();
1036 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1037 ret = -EFAULT;
1038 break;
1039 case FBIOGET_FSCREENINFO:
1040 ret = copy_to_user(argp, &info->fix,
1041 sizeof(fix)) ? -EFAULT : 0;
1042 break;
1043 case FBIOPUTCMAP:
1044 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1045 ret = -EFAULT;
1046 else
1047 ret = fb_set_user_cmap(&cmap, info);
1048 break;
1049 case FBIOGETCMAP:
1050 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1051 ret = -EFAULT;
1052 else
1053 ret = fb_cmap_to_user(&info->cmap, &cmap);
1054 break;
1055 case FBIOPAN_DISPLAY:
1056 if (copy_from_user(&var, argp, sizeof(var))) {
1057 ret = -EFAULT;
1058 break;
1059 }
1060 acquire_console_sem();
1061 ret = fb_pan_display(info, &var);
1062 release_console_sem();
1063 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1064 ret = -EFAULT;
1065 break;
1066 case FBIO_CURSOR:
1067 ret = -EINVAL;
1068 break;
1069 case FBIOGET_CON2FBMAP:
1070 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1071 ret = -EFAULT;
1072 else if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1073 ret = -EINVAL;
1074 else {
1075 con2fb.framebuffer = -1;
1076 event.info = info;
1077 event.data = &con2fb;
1078 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP,
1079 &event);
1080 ret = copy_to_user(argp, &con2fb,
1081 sizeof(con2fb)) ? -EFAULT : 0;
1082 }
1083 break;
1084 case FBIOPUT_CON2FBMAP:
1085 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) {
1086 ret = -EFAULT;
1087 break;
1088 }
1089 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) {
1090 ret = -EINVAL;
1091 break;
1092 }
1093 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX) {
1094 ret = -EINVAL;
1095 break;
1096 }
1097 if (!registered_fb[con2fb.framebuffer])
1098 request_module("fb%d", con2fb.framebuffer);
1099 if (!registered_fb[con2fb.framebuffer]) {
1100 ret = -EINVAL;
1101 break;
1102 }
1103 event.info = info;
1104 event.data = &con2fb;
1105 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1106 &event);
1107 break;
1108 case FBIOBLANK:
1109 acquire_console_sem();
1110 info->flags |= FBINFO_MISC_USEREVENT;
1111 ret = fb_blank(info, arg);
1112 info->flags &= ~FBINFO_MISC_USEREVENT;
1113 release_console_sem();
1114 break;;
1115 default:
1116 if (fb->fb_ioctl == NULL)
1117 ret = -ENOTTY;
1118 else
1119 ret = fb->fb_ioctl(info, cmd, arg);
1120 }
1121 return ret;
1122 }
1123
1124 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1125 __acquires(&info->lock)
1126 __releases(&info->lock)
1127 {
1128 struct inode *inode = file->f_path.dentry->d_inode;
1129 int fbidx = iminor(inode);
1130 struct fb_info *info;
1131 long ret;
1132
1133 info = registered_fb[fbidx];
1134 mutex_lock(&info->lock);
1135 ret = do_fb_ioctl(info, cmd, arg);
1136 mutex_unlock(&info->lock);
1137 return ret;
1138 }
1139
1140 #ifdef CONFIG_COMPAT
1141 struct fb_fix_screeninfo32 {
1142 char id[16];
1143 compat_caddr_t smem_start;
1144 u32 smem_len;
1145 u32 type;
1146 u32 type_aux;
1147 u32 visual;
1148 u16 xpanstep;
1149 u16 ypanstep;
1150 u16 ywrapstep;
1151 u32 line_length;
1152 compat_caddr_t mmio_start;
1153 u32 mmio_len;
1154 u32 accel;
1155 u16 reserved[3];
1156 };
1157
1158 struct fb_cmap32 {
1159 u32 start;
1160 u32 len;
1161 compat_caddr_t red;
1162 compat_caddr_t green;
1163 compat_caddr_t blue;
1164 compat_caddr_t transp;
1165 };
1166
1167 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1168 unsigned long arg)
1169 {
1170 struct fb_cmap_user __user *cmap;
1171 struct fb_cmap32 __user *cmap32;
1172 __u32 data;
1173 int err;
1174
1175 cmap = compat_alloc_user_space(sizeof(*cmap));
1176 cmap32 = compat_ptr(arg);
1177
1178 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1179 return -EFAULT;
1180
1181 if (get_user(data, &cmap32->red) ||
1182 put_user(compat_ptr(data), &cmap->red) ||
1183 get_user(data, &cmap32->green) ||
1184 put_user(compat_ptr(data), &cmap->green) ||
1185 get_user(data, &cmap32->blue) ||
1186 put_user(compat_ptr(data), &cmap->blue) ||
1187 get_user(data, &cmap32->transp) ||
1188 put_user(compat_ptr(data), &cmap->transp))
1189 return -EFAULT;
1190
1191 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1192
1193 if (!err) {
1194 if (copy_in_user(&cmap32->start,
1195 &cmap->start,
1196 2 * sizeof(__u32)))
1197 err = -EFAULT;
1198 }
1199 return err;
1200 }
1201
1202 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1203 struct fb_fix_screeninfo32 __user *fix32)
1204 {
1205 __u32 data;
1206 int err;
1207
1208 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1209
1210 data = (__u32) (unsigned long) fix->smem_start;
1211 err |= put_user(data, &fix32->smem_start);
1212
1213 err |= put_user(fix->smem_len, &fix32->smem_len);
1214 err |= put_user(fix->type, &fix32->type);
1215 err |= put_user(fix->type_aux, &fix32->type_aux);
1216 err |= put_user(fix->visual, &fix32->visual);
1217 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1218 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1219 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1220 err |= put_user(fix->line_length, &fix32->line_length);
1221
1222 data = (__u32) (unsigned long) fix->mmio_start;
1223 err |= put_user(data, &fix32->mmio_start);
1224
1225 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1226 err |= put_user(fix->accel, &fix32->accel);
1227 err |= copy_to_user(fix32->reserved, fix->reserved,
1228 sizeof(fix->reserved));
1229
1230 return err;
1231 }
1232
1233 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1234 unsigned long arg)
1235 {
1236 mm_segment_t old_fs;
1237 struct fb_fix_screeninfo fix;
1238 struct fb_fix_screeninfo32 __user *fix32;
1239 int err;
1240
1241 fix32 = compat_ptr(arg);
1242
1243 old_fs = get_fs();
1244 set_fs(KERNEL_DS);
1245 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1246 set_fs(old_fs);
1247
1248 if (!err)
1249 err = do_fscreeninfo_to_user(&fix, fix32);
1250
1251 return err;
1252 }
1253
1254 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1255 unsigned long arg)
1256 __acquires(&info->lock)
1257 __releases(&info->lock)
1258 {
1259 struct inode *inode = file->f_path.dentry->d_inode;
1260 int fbidx = iminor(inode);
1261 struct fb_info *info = registered_fb[fbidx];
1262 struct fb_ops *fb = info->fbops;
1263 long ret = -ENOIOCTLCMD;
1264
1265 mutex_lock(&info->lock);
1266 switch(cmd) {
1267 case FBIOGET_VSCREENINFO:
1268 case FBIOPUT_VSCREENINFO:
1269 case FBIOPAN_DISPLAY:
1270 case FBIOGET_CON2FBMAP:
1271 case FBIOPUT_CON2FBMAP:
1272 arg = (unsigned long) compat_ptr(arg);
1273 case FBIOBLANK:
1274 ret = do_fb_ioctl(info, cmd, arg);
1275 break;
1276
1277 case FBIOGET_FSCREENINFO:
1278 ret = fb_get_fscreeninfo(info, cmd, arg);
1279 break;
1280
1281 case FBIOGETCMAP:
1282 case FBIOPUTCMAP:
1283 ret = fb_getput_cmap(info, cmd, arg);
1284 break;
1285
1286 default:
1287 if (fb->fb_compat_ioctl)
1288 ret = fb->fb_compat_ioctl(info, cmd, arg);
1289 break;
1290 }
1291 mutex_unlock(&info->lock);
1292 return ret;
1293 }
1294 #endif
1295
1296 static int
1297 fb_mmap(struct file *file, struct vm_area_struct * vma)
1298 __acquires(&info->lock)
1299 __releases(&info->lock)
1300 {
1301 int fbidx = iminor(file->f_path.dentry->d_inode);
1302 struct fb_info *info = registered_fb[fbidx];
1303 struct fb_ops *fb = info->fbops;
1304 unsigned long off;
1305 unsigned long start;
1306 u32 len;
1307
1308 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1309 return -EINVAL;
1310 off = vma->vm_pgoff << PAGE_SHIFT;
1311 if (!fb)
1312 return -ENODEV;
1313 if (fb->fb_mmap) {
1314 int res;
1315 mutex_lock(&info->lock);
1316 res = fb->fb_mmap(info, vma);
1317 mutex_unlock(&info->lock);
1318 return res;
1319 }
1320
1321 mutex_lock(&info->lock);
1322
1323 /* frame buffer memory */
1324 start = info->fix.smem_start;
1325 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1326 if (off >= len) {
1327 /* memory mapped io */
1328 off -= len;
1329 if (info->var.accel_flags) {
1330 mutex_unlock(&info->lock);
1331 return -EINVAL;
1332 }
1333 start = info->fix.mmio_start;
1334 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1335 }
1336 mutex_unlock(&info->lock);
1337 start &= PAGE_MASK;
1338 if ((vma->vm_end - vma->vm_start + off) > len)
1339 return -EINVAL;
1340 off += start;
1341 vma->vm_pgoff = off >> PAGE_SHIFT;
1342 /* This is an IO map - tell maydump to skip this VMA */
1343 vma->vm_flags |= VM_IO | VM_RESERVED;
1344 fb_pgprotect(file, vma, off);
1345 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1346 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1347 return -EAGAIN;
1348 return 0;
1349 }
1350
1351 static int
1352 fb_open(struct inode *inode, struct file *file)
1353 __acquires(&info->lock)
1354 __releases(&info->lock)
1355 {
1356 int fbidx = iminor(inode);
1357 struct fb_info *info;
1358 int res = 0;
1359
1360 if (fbidx >= FB_MAX)
1361 return -ENODEV;
1362 info = registered_fb[fbidx];
1363 if (!info)
1364 request_module("fb%d", fbidx);
1365 info = registered_fb[fbidx];
1366 if (!info)
1367 return -ENODEV;
1368 mutex_lock(&info->lock);
1369 if (!try_module_get(info->fbops->owner)) {
1370 res = -ENODEV;
1371 goto out;
1372 }
1373 file->private_data = info;
1374 if (info->fbops->fb_open) {
1375 res = info->fbops->fb_open(info,1);
1376 if (res)
1377 module_put(info->fbops->owner);
1378 }
1379 #ifdef CONFIG_FB_DEFERRED_IO
1380 if (info->fbdefio)
1381 fb_deferred_io_open(info, inode, file);
1382 #endif
1383 out:
1384 mutex_unlock(&info->lock);
1385 return res;
1386 }
1387
1388 static int
1389 fb_release(struct inode *inode, struct file *file)
1390 __acquires(&info->lock)
1391 __releases(&info->lock)
1392 {
1393 struct fb_info * const info = file->private_data;
1394
1395 mutex_lock(&info->lock);
1396 if (info->fbops->fb_release)
1397 info->fbops->fb_release(info,1);
1398 module_put(info->fbops->owner);
1399 mutex_unlock(&info->lock);
1400 return 0;
1401 }
1402
1403 static const struct file_operations fb_fops = {
1404 .owner = THIS_MODULE,
1405 .read = fb_read,
1406 .write = fb_write,
1407 .unlocked_ioctl = fb_ioctl,
1408 #ifdef CONFIG_COMPAT
1409 .compat_ioctl = fb_compat_ioctl,
1410 #endif
1411 .mmap = fb_mmap,
1412 .open = fb_open,
1413 .release = fb_release,
1414 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1415 .get_unmapped_area = get_fb_unmapped_area,
1416 #endif
1417 #ifdef CONFIG_FB_DEFERRED_IO
1418 .fsync = fb_deferred_io_fsync,
1419 #endif
1420 };
1421
1422 struct class *fb_class;
1423 EXPORT_SYMBOL(fb_class);
1424
1425 static int fb_check_foreignness(struct fb_info *fi)
1426 {
1427 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1428
1429 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1430
1431 #ifdef __BIG_ENDIAN
1432 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1433 #else
1434 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1435 #endif /* __BIG_ENDIAN */
1436
1437 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1438 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1439 "support this framebuffer\n", fi->fix.id);
1440 return -ENOSYS;
1441 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1442 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1443 "support this framebuffer\n", fi->fix.id);
1444 return -ENOSYS;
1445 }
1446
1447 return 0;
1448 }
1449
1450 /**
1451 * register_framebuffer - registers a frame buffer device
1452 * @fb_info: frame buffer info structure
1453 *
1454 * Registers a frame buffer device @fb_info.
1455 *
1456 * Returns negative errno on error, or zero for success.
1457 *
1458 */
1459
1460 int
1461 register_framebuffer(struct fb_info *fb_info)
1462 {
1463 int i;
1464 struct fb_event event;
1465 struct fb_videomode mode;
1466
1467 if (num_registered_fb == FB_MAX)
1468 return -ENXIO;
1469
1470 if (fb_check_foreignness(fb_info))
1471 return -ENOSYS;
1472
1473 num_registered_fb++;
1474 for (i = 0 ; i < FB_MAX; i++)
1475 if (!registered_fb[i])
1476 break;
1477 fb_info->node = i;
1478 mutex_init(&fb_info->lock);
1479
1480 fb_info->dev = device_create(fb_class, fb_info->device,
1481 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1482 if (IS_ERR(fb_info->dev)) {
1483 /* Not fatal */
1484 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1485 fb_info->dev = NULL;
1486 } else
1487 fb_init_device(fb_info);
1488
1489 if (fb_info->pixmap.addr == NULL) {
1490 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1491 if (fb_info->pixmap.addr) {
1492 fb_info->pixmap.size = FBPIXMAPSIZE;
1493 fb_info->pixmap.buf_align = 1;
1494 fb_info->pixmap.scan_align = 1;
1495 fb_info->pixmap.access_align = 32;
1496 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1497 }
1498 }
1499 fb_info->pixmap.offset = 0;
1500
1501 if (!fb_info->pixmap.blit_x)
1502 fb_info->pixmap.blit_x = ~(u32)0;
1503
1504 if (!fb_info->pixmap.blit_y)
1505 fb_info->pixmap.blit_y = ~(u32)0;
1506
1507 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1508 INIT_LIST_HEAD(&fb_info->modelist);
1509
1510 fb_var_to_videomode(&mode, &fb_info->var);
1511 fb_add_videomode(&mode, &fb_info->modelist);
1512 registered_fb[i] = fb_info;
1513
1514 event.info = fb_info;
1515 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1516 return 0;
1517 }
1518
1519
1520 /**
1521 * unregister_framebuffer - releases a frame buffer device
1522 * @fb_info: frame buffer info structure
1523 *
1524 * Unregisters a frame buffer device @fb_info.
1525 *
1526 * Returns negative errno on error, or zero for success.
1527 *
1528 * This function will also notify the framebuffer console
1529 * to release the driver.
1530 *
1531 * This is meant to be called within a driver's module_exit()
1532 * function. If this is called outside module_exit(), ensure
1533 * that the driver implements fb_open() and fb_release() to
1534 * check that no processes are using the device.
1535 */
1536
1537 int
1538 unregister_framebuffer(struct fb_info *fb_info)
1539 {
1540 struct fb_event event;
1541 int i, ret = 0;
1542
1543 i = fb_info->node;
1544 if (!registered_fb[i]) {
1545 ret = -EINVAL;
1546 goto done;
1547 }
1548
1549 event.info = fb_info;
1550 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1551
1552 if (ret) {
1553 ret = -EINVAL;
1554 goto done;
1555 }
1556
1557 if (fb_info->pixmap.addr &&
1558 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1559 kfree(fb_info->pixmap.addr);
1560 fb_destroy_modelist(&fb_info->modelist);
1561 registered_fb[i]=NULL;
1562 num_registered_fb--;
1563 fb_cleanup_device(fb_info);
1564 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1565 event.info = fb_info;
1566 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1567 done:
1568 return ret;
1569 }
1570
1571 /**
1572 * fb_set_suspend - low level driver signals suspend
1573 * @info: framebuffer affected
1574 * @state: 0 = resuming, !=0 = suspending
1575 *
1576 * This is meant to be used by low level drivers to
1577 * signal suspend/resume to the core & clients.
1578 * It must be called with the console semaphore held
1579 */
1580 void fb_set_suspend(struct fb_info *info, int state)
1581 {
1582 struct fb_event event;
1583
1584 event.info = info;
1585 if (state) {
1586 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1587 info->state = FBINFO_STATE_SUSPENDED;
1588 } else {
1589 info->state = FBINFO_STATE_RUNNING;
1590 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1591 }
1592 }
1593
1594 /**
1595 * fbmem_init - init frame buffer subsystem
1596 *
1597 * Initialize the frame buffer subsystem.
1598 *
1599 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1600 *
1601 */
1602
1603 static int __init
1604 fbmem_init(void)
1605 {
1606 proc_create("fb", 0, NULL, &fb_proc_fops);
1607
1608 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1609 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1610
1611 fb_class = class_create(THIS_MODULE, "graphics");
1612 if (IS_ERR(fb_class)) {
1613 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1614 fb_class = NULL;
1615 }
1616 return 0;
1617 }
1618
1619 #ifdef MODULE
1620 module_init(fbmem_init);
1621 static void __exit
1622 fbmem_exit(void)
1623 {
1624 remove_proc_entry("fb", NULL);
1625 class_destroy(fb_class);
1626 unregister_chrdev(FB_MAJOR, "fb");
1627 }
1628
1629 module_exit(fbmem_exit);
1630 MODULE_LICENSE("GPL");
1631 MODULE_DESCRIPTION("Framebuffer base");
1632 #else
1633 subsys_initcall(fbmem_init);
1634 #endif
1635
1636 int fb_new_modelist(struct fb_info *info)
1637 {
1638 struct fb_event event;
1639 struct fb_var_screeninfo var = info->var;
1640 struct list_head *pos, *n;
1641 struct fb_modelist *modelist;
1642 struct fb_videomode *m, mode;
1643 int err = 1;
1644
1645 list_for_each_safe(pos, n, &info->modelist) {
1646 modelist = list_entry(pos, struct fb_modelist, list);
1647 m = &modelist->mode;
1648 fb_videomode_to_var(&var, m);
1649 var.activate = FB_ACTIVATE_TEST;
1650 err = fb_set_var(info, &var);
1651 fb_var_to_videomode(&mode, &var);
1652 if (err || !fb_mode_is_equal(m, &mode)) {
1653 list_del(pos);
1654 kfree(pos);
1655 }
1656 }
1657
1658 err = 1;
1659
1660 if (!list_empty(&info->modelist)) {
1661 event.info = info;
1662 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1663 }
1664
1665 return err;
1666 }
1667
1668 static char *video_options[FB_MAX] __read_mostly;
1669 static int ofonly __read_mostly;
1670
1671 /**
1672 * fb_get_options - get kernel boot parameters
1673 * @name: framebuffer name as it would appear in
1674 * the boot parameter line
1675 * (video=<name>:<options>)
1676 * @option: the option will be stored here
1677 *
1678 * NOTE: Needed to maintain backwards compatibility
1679 */
1680 int fb_get_options(char *name, char **option)
1681 {
1682 char *opt, *options = NULL;
1683 int opt_len, retval = 0;
1684 int name_len = strlen(name), i;
1685
1686 if (name_len && ofonly && strncmp(name, "offb", 4))
1687 retval = 1;
1688
1689 if (name_len && !retval) {
1690 for (i = 0; i < FB_MAX; i++) {
1691 if (video_options[i] == NULL)
1692 continue;
1693 opt_len = strlen(video_options[i]);
1694 if (!opt_len)
1695 continue;
1696 opt = video_options[i];
1697 if (!strncmp(name, opt, name_len) &&
1698 opt[name_len] == ':')
1699 options = opt + name_len + 1;
1700 }
1701 }
1702 if (options && !strncmp(options, "off", 3))
1703 retval = 1;
1704
1705 if (option)
1706 *option = options;
1707
1708 return retval;
1709 }
1710
1711 #ifndef MODULE
1712 /**
1713 * video_setup - process command line options
1714 * @options: string of options
1715 *
1716 * Process command line options for frame buffer subsystem.
1717 *
1718 * NOTE: This function is a __setup and __init function.
1719 * It only stores the options. Drivers have to call
1720 * fb_get_options() as necessary.
1721 *
1722 * Returns zero.
1723 *
1724 */
1725 static int __init video_setup(char *options)
1726 {
1727 int i, global = 0;
1728
1729 if (!options || !*options)
1730 global = 1;
1731
1732 if (!global && !strncmp(options, "ofonly", 6)) {
1733 ofonly = 1;
1734 global = 1;
1735 }
1736
1737 if (!global && !strstr(options, "fb:")) {
1738 fb_mode_option = options;
1739 global = 1;
1740 }
1741
1742 if (!global) {
1743 for (i = 0; i < FB_MAX; i++) {
1744 if (video_options[i] == NULL) {
1745 video_options[i] = options;
1746 break;
1747 }
1748
1749 }
1750 }
1751
1752 return 1;
1753 }
1754 __setup("video=", video_setup);
1755 #endif
1756
1757 /*
1758 * Visible symbols for modules
1759 */
1760
1761 EXPORT_SYMBOL(register_framebuffer);
1762 EXPORT_SYMBOL(unregister_framebuffer);
1763 EXPORT_SYMBOL(num_registered_fb);
1764 EXPORT_SYMBOL(registered_fb);
1765 EXPORT_SYMBOL(fb_show_logo);
1766 EXPORT_SYMBOL(fb_set_var);
1767 EXPORT_SYMBOL(fb_blank);
1768 EXPORT_SYMBOL(fb_pan_display);
1769 EXPORT_SYMBOL(fb_get_buffer_offset);
1770 EXPORT_SYMBOL(fb_set_suspend);
1771 EXPORT_SYMBOL(fb_get_options);
1772
1773 MODULE_LICENSE("GPL");
kernel-based virtual machine