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fbdev: advertise limitation of drawing engine
[deliverable/linux.git] / drivers / video / fbmem.c
1 /*
2 * linux/drivers/video/fbmem.c
3 *
4 * Copyright (C) 1994 Martin Schaller
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive
11 * for more details.
12 */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/smp_lock.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/mman.h>
25 #include <linux/vt.h>
26 #include <linux/init.h>
27 #include <linux/linux_logo.h>
28 #include <linux/proc_fs.h>
29 #include <linux/console.h>
30 #ifdef CONFIG_KMOD
31 #include <linux/kmod.h>
32 #endif
33 #include <linux/err.h>
34 #include <linux/device.h>
35 #include <linux/efi.h>
36
37 #if defined(__mc68000__) || defined(CONFIG_APUS)
38 #include <asm/setup.h>
39 #endif
40
41 #include <asm/io.h>
42 #include <asm/uaccess.h>
43 #include <asm/page.h>
44 #include <asm/pgtable.h>
45
46 #include <linux/fb.h>
47
48 /*
49 * Frame buffer device initialization and setup routines
50 */
51
52 #define FBPIXMAPSIZE (1024 * 8)
53
54 struct fb_info *registered_fb[FB_MAX] __read_mostly;
55 int num_registered_fb __read_mostly;
56
57 /*
58 * Helpers
59 */
60
61 int fb_get_color_depth(struct fb_var_screeninfo *var,
62 struct fb_fix_screeninfo *fix)
63 {
64 int depth = 0;
65
66 if (fix->visual == FB_VISUAL_MONO01 ||
67 fix->visual == FB_VISUAL_MONO10)
68 depth = 1;
69 else {
70 if (var->green.length == var->blue.length &&
71 var->green.length == var->red.length &&
72 var->green.offset == var->blue.offset &&
73 var->green.offset == var->red.offset)
74 depth = var->green.length;
75 else
76 depth = var->green.length + var->red.length +
77 var->blue.length;
78 }
79
80 return depth;
81 }
82 EXPORT_SYMBOL(fb_get_color_depth);
83
84 /*
85 * Data padding functions.
86 */
87 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
88 {
89 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
90 }
91 EXPORT_SYMBOL(fb_pad_aligned_buffer);
92
93 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
94 u32 shift_high, u32 shift_low, u32 mod)
95 {
96 u8 mask = (u8) (0xfff << shift_high), tmp;
97 int i, j;
98
99 for (i = height; i--; ) {
100 for (j = 0; j < idx; j++) {
101 tmp = dst[j];
102 tmp &= mask;
103 tmp |= *src >> shift_low;
104 dst[j] = tmp;
105 tmp = *src << shift_high;
106 dst[j+1] = tmp;
107 src++;
108 }
109 tmp = dst[idx];
110 tmp &= mask;
111 tmp |= *src >> shift_low;
112 dst[idx] = tmp;
113 if (shift_high < mod) {
114 tmp = *src << shift_high;
115 dst[idx+1] = tmp;
116 }
117 src++;
118 dst += d_pitch;
119 }
120 }
121 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
122
123 /*
124 * we need to lock this section since fb_cursor
125 * may use fb_imageblit()
126 */
127 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
128 {
129 u32 align = buf->buf_align - 1, offset;
130 char *addr = buf->addr;
131
132 /* If IO mapped, we need to sync before access, no sharing of
133 * the pixmap is done
134 */
135 if (buf->flags & FB_PIXMAP_IO) {
136 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
137 info->fbops->fb_sync(info);
138 return addr;
139 }
140
141 /* See if we fit in the remaining pixmap space */
142 offset = buf->offset + align;
143 offset &= ~align;
144 if (offset + size > buf->size) {
145 /* We do not fit. In order to be able to re-use the buffer,
146 * we must ensure no asynchronous DMA'ing or whatever operation
147 * is in progress, we sync for that.
148 */
149 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
150 info->fbops->fb_sync(info);
151 offset = 0;
152 }
153 buf->offset = offset + size;
154 addr += offset;
155
156 return addr;
157 }
158
159 #ifdef CONFIG_LOGO
160
161 static inline unsigned safe_shift(unsigned d, int n)
162 {
163 return n < 0 ? d >> -n : d << n;
164 }
165
166 static void fb_set_logocmap(struct fb_info *info,
167 const struct linux_logo *logo)
168 {
169 struct fb_cmap palette_cmap;
170 u16 palette_green[16];
171 u16 palette_blue[16];
172 u16 palette_red[16];
173 int i, j, n;
174 const unsigned char *clut = logo->clut;
175
176 palette_cmap.start = 0;
177 palette_cmap.len = 16;
178 palette_cmap.red = palette_red;
179 palette_cmap.green = palette_green;
180 palette_cmap.blue = palette_blue;
181 palette_cmap.transp = NULL;
182
183 for (i = 0; i < logo->clutsize; i += n) {
184 n = logo->clutsize - i;
185 /* palette_cmap provides space for only 16 colors at once */
186 if (n > 16)
187 n = 16;
188 palette_cmap.start = 32 + i;
189 palette_cmap.len = n;
190 for (j = 0; j < n; ++j) {
191 palette_cmap.red[j] = clut[0] << 8 | clut[0];
192 palette_cmap.green[j] = clut[1] << 8 | clut[1];
193 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
194 clut += 3;
195 }
196 fb_set_cmap(&palette_cmap, info);
197 }
198 }
199
200 static void fb_set_logo_truepalette(struct fb_info *info,
201 const struct linux_logo *logo,
202 u32 *palette)
203 {
204 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
205 unsigned char redmask, greenmask, bluemask;
206 int redshift, greenshift, blueshift;
207 int i;
208 const unsigned char *clut = logo->clut;
209
210 /*
211 * We have to create a temporary palette since console palette is only
212 * 16 colors long.
213 */
214 /* Bug: Doesn't obey msb_right ... (who needs that?) */
215 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
216 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
217 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
218 redshift = info->var.red.offset - (8 - info->var.red.length);
219 greenshift = info->var.green.offset - (8 - info->var.green.length);
220 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
221
222 for ( i = 0; i < logo->clutsize; i++) {
223 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
224 safe_shift((clut[1] & greenmask), greenshift) |
225 safe_shift((clut[2] & bluemask), blueshift));
226 clut += 3;
227 }
228 }
229
230 static void fb_set_logo_directpalette(struct fb_info *info,
231 const struct linux_logo *logo,
232 u32 *palette)
233 {
234 int redshift, greenshift, blueshift;
235 int i;
236
237 redshift = info->var.red.offset;
238 greenshift = info->var.green.offset;
239 blueshift = info->var.blue.offset;
240
241 for (i = 32; i < logo->clutsize; i++)
242 palette[i] = i << redshift | i << greenshift | i << blueshift;
243 }
244
245 static void fb_set_logo(struct fb_info *info,
246 const struct linux_logo *logo, u8 *dst,
247 int depth)
248 {
249 int i, j, k;
250 const u8 *src = logo->data;
251 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
252 u8 fg = 1, d;
253
254 if (fb_get_color_depth(&info->var, &info->fix) == 3)
255 fg = 7;
256
257 if (info->fix.visual == FB_VISUAL_MONO01 ||
258 info->fix.visual == FB_VISUAL_MONO10)
259 fg = ~((u8) (0xfff << info->var.green.length));
260
261 switch (depth) {
262 case 4:
263 for (i = 0; i < logo->height; i++)
264 for (j = 0; j < logo->width; src++) {
265 *dst++ = *src >> 4;
266 j++;
267 if (j < logo->width) {
268 *dst++ = *src & 0x0f;
269 j++;
270 }
271 }
272 break;
273 case 1:
274 for (i = 0; i < logo->height; i++) {
275 for (j = 0; j < logo->width; src++) {
276 d = *src ^ xor;
277 for (k = 7; k >= 0; k--) {
278 *dst++ = ((d >> k) & 1) ? fg : 0;
279 j++;
280 }
281 }
282 }
283 break;
284 }
285 }
286
287 /*
288 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
289 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
290 * the visual format and color depth of the framebuffer, the DAC, the
291 * pseudo_palette, and the logo data will be adjusted accordingly.
292 *
293 * Case 1 - linux_logo_clut224:
294 * Color exceeds the number of console colors (16), thus we set the hardware DAC
295 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
296 *
297 * For visuals that require color info from the pseudo_palette, we also construct
298 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
299 * will be set.
300 *
301 * Case 2 - linux_logo_vga16:
302 * The number of colors just matches the console colors, thus there is no need
303 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
304 * each byte contains color information for two pixels (upper and lower nibble).
305 * To be consistent with fb_imageblit() usage, we therefore separate the two
306 * nibbles into separate bytes. The "depth" flag will be set to 4.
307 *
308 * Case 3 - linux_logo_mono:
309 * This is similar with Case 2. Each byte contains information for 8 pixels.
310 * We isolate each bit and expand each into a byte. The "depth" flag will
311 * be set to 1.
312 */
313 static struct logo_data {
314 int depth;
315 int needs_directpalette;
316 int needs_truepalette;
317 int needs_cmapreset;
318 const struct linux_logo *logo;
319 } fb_logo __read_mostly;
320
321 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
322 {
323 u32 size = width * height, i;
324
325 out += size - 1;
326
327 for (i = size; i--; )
328 *out-- = *in++;
329 }
330
331 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
332 {
333 int i, j, h = height - 1;
334
335 for (i = 0; i < height; i++)
336 for (j = 0; j < width; j++)
337 out[height * j + h - i] = *in++;
338 }
339
340 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
341 {
342 int i, j, w = width - 1;
343
344 for (i = 0; i < height; i++)
345 for (j = 0; j < width; j++)
346 out[height * (w - j) + i] = *in++;
347 }
348
349 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
350 struct fb_image *image, int rotate)
351 {
352 u32 tmp;
353
354 if (rotate == FB_ROTATE_UD) {
355 fb_rotate_logo_ud(image->data, dst, image->width,
356 image->height);
357 image->dx = info->var.xres - image->width - image->dx;
358 image->dy = info->var.yres - image->height - image->dy;
359 } else if (rotate == FB_ROTATE_CW) {
360 fb_rotate_logo_cw(image->data, dst, image->width,
361 image->height);
362 tmp = image->width;
363 image->width = image->height;
364 image->height = tmp;
365 tmp = image->dy;
366 image->dy = image->dx;
367 image->dx = info->var.xres - image->width - tmp;
368 } else if (rotate == FB_ROTATE_CCW) {
369 fb_rotate_logo_ccw(image->data, dst, image->width,
370 image->height);
371 tmp = image->width;
372 image->width = image->height;
373 image->height = tmp;
374 tmp = image->dx;
375 image->dx = image->dy;
376 image->dy = info->var.yres - image->height - tmp;
377 }
378
379 image->data = dst;
380 }
381
382 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
383 int rotate, unsigned int num)
384 {
385 unsigned int x;
386
387 if (rotate == FB_ROTATE_UR) {
388 for (x = 0;
389 x < num && image->dx + image->width <= info->var.xres;
390 x++) {
391 info->fbops->fb_imageblit(info, image);
392 image->dx += image->width + 8;
393 }
394 } else if (rotate == FB_ROTATE_UD) {
395 for (x = 0; x < num && image->dx >= 0; x++) {
396 info->fbops->fb_imageblit(info, image);
397 image->dx -= image->width + 8;
398 }
399 } else if (rotate == FB_ROTATE_CW) {
400 for (x = 0;
401 x < num && image->dy + image->height <= info->var.yres;
402 x++) {
403 info->fbops->fb_imageblit(info, image);
404 image->dy += image->height + 8;
405 }
406 } else if (rotate == FB_ROTATE_CCW) {
407 for (x = 0; x < num && image->dy >= 0; x++) {
408 info->fbops->fb_imageblit(info, image);
409 image->dy -= image->height + 8;
410 }
411 }
412 }
413
414 int fb_prepare_logo(struct fb_info *info, int rotate)
415 {
416 int depth = fb_get_color_depth(&info->var, &info->fix);
417 int yres;
418
419 memset(&fb_logo, 0, sizeof(struct logo_data));
420
421 if (info->flags & FBINFO_MISC_TILEBLITTING ||
422 info->flags & FBINFO_MODULE)
423 return 0;
424
425 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
426 depth = info->var.blue.length;
427 if (info->var.red.length < depth)
428 depth = info->var.red.length;
429 if (info->var.green.length < depth)
430 depth = info->var.green.length;
431 }
432
433 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
434 /* assume console colormap */
435 depth = 4;
436 }
437
438 if (depth >= 8) {
439 switch (info->fix.visual) {
440 case FB_VISUAL_TRUECOLOR:
441 fb_logo.needs_truepalette = 1;
442 break;
443 case FB_VISUAL_DIRECTCOLOR:
444 fb_logo.needs_directpalette = 1;
445 fb_logo.needs_cmapreset = 1;
446 break;
447 case FB_VISUAL_PSEUDOCOLOR:
448 fb_logo.needs_cmapreset = 1;
449 break;
450 }
451 }
452
453 /* Return if no suitable logo was found */
454 fb_logo.logo = fb_find_logo(depth);
455
456 if (!fb_logo.logo) {
457 return 0;
458 }
459
460 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
461 yres = info->var.yres;
462 else
463 yres = info->var.xres;
464
465 if (fb_logo.logo->height > yres) {
466 fb_logo.logo = NULL;
467 return 0;
468 }
469
470 /* What depth we asked for might be different from what we get */
471 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
472 fb_logo.depth = 8;
473 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
474 fb_logo.depth = 4;
475 else
476 fb_logo.depth = 1;
477 return fb_logo.logo->height;
478 }
479
480 int fb_show_logo(struct fb_info *info, int rotate)
481 {
482 u32 *palette = NULL, *saved_pseudo_palette = NULL;
483 unsigned char *logo_new = NULL, *logo_rotate = NULL;
484 struct fb_image image;
485
486 /* Return if the frame buffer is not mapped or suspended */
487 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING ||
488 info->flags & FBINFO_MODULE)
489 return 0;
490
491 image.depth = 8;
492 image.data = fb_logo.logo->data;
493
494 if (fb_logo.needs_cmapreset)
495 fb_set_logocmap(info, fb_logo.logo);
496
497 if (fb_logo.needs_truepalette ||
498 fb_logo.needs_directpalette) {
499 palette = kmalloc(256 * 4, GFP_KERNEL);
500 if (palette == NULL)
501 return 0;
502
503 if (fb_logo.needs_truepalette)
504 fb_set_logo_truepalette(info, fb_logo.logo, palette);
505 else
506 fb_set_logo_directpalette(info, fb_logo.logo, palette);
507
508 saved_pseudo_palette = info->pseudo_palette;
509 info->pseudo_palette = palette;
510 }
511
512 if (fb_logo.depth <= 4) {
513 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
514 GFP_KERNEL);
515 if (logo_new == NULL) {
516 kfree(palette);
517 if (saved_pseudo_palette)
518 info->pseudo_palette = saved_pseudo_palette;
519 return 0;
520 }
521 image.data = logo_new;
522 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
523 }
524
525 image.dx = 0;
526 image.dy = 0;
527 image.width = fb_logo.logo->width;
528 image.height = fb_logo.logo->height;
529
530 if (rotate) {
531 logo_rotate = kmalloc(fb_logo.logo->width *
532 fb_logo.logo->height, GFP_KERNEL);
533 if (logo_rotate)
534 fb_rotate_logo(info, logo_rotate, &image, rotate);
535 }
536
537 fb_do_show_logo(info, &image, rotate, num_online_cpus());
538
539 kfree(palette);
540 if (saved_pseudo_palette != NULL)
541 info->pseudo_palette = saved_pseudo_palette;
542 kfree(logo_new);
543 kfree(logo_rotate);
544 return fb_logo.logo->height;
545 }
546 #else
547 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
548 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
549 #endif /* CONFIG_LOGO */
550
551 static int fbmem_read_proc(char *buf, char **start, off_t offset,
552 int len, int *eof, void *private)
553 {
554 struct fb_info **fi;
555 int clen;
556
557 clen = 0;
558 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
559 fi++)
560 if (*fi)
561 clen += sprintf(buf + clen, "%d %s\n",
562 (*fi)->node,
563 (*fi)->fix.id);
564 *start = buf + offset;
565 if (clen > offset)
566 clen -= offset;
567 else
568 clen = 0;
569 return clen < len ? clen : len;
570 }
571
572 static ssize_t
573 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
574 {
575 unsigned long p = *ppos;
576 struct inode *inode = file->f_path.dentry->d_inode;
577 int fbidx = iminor(inode);
578 struct fb_info *info = registered_fb[fbidx];
579 u32 *buffer, *dst;
580 u32 __iomem *src;
581 int c, i, cnt = 0, err = 0;
582 unsigned long total_size;
583
584 if (!info || ! info->screen_base)
585 return -ENODEV;
586
587 if (info->state != FBINFO_STATE_RUNNING)
588 return -EPERM;
589
590 if (info->fbops->fb_read)
591 return info->fbops->fb_read(info, buf, count, ppos);
592
593 total_size = info->screen_size;
594
595 if (total_size == 0)
596 total_size = info->fix.smem_len;
597
598 if (p >= total_size)
599 return 0;
600
601 if (count >= total_size)
602 count = total_size;
603
604 if (count + p > total_size)
605 count = total_size - p;
606
607 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
608 GFP_KERNEL);
609 if (!buffer)
610 return -ENOMEM;
611
612 src = (u32 __iomem *) (info->screen_base + p);
613
614 if (info->fbops->fb_sync)
615 info->fbops->fb_sync(info);
616
617 while (count) {
618 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
619 dst = buffer;
620 for (i = c >> 2; i--; )
621 *dst++ = fb_readl(src++);
622 if (c & 3) {
623 u8 *dst8 = (u8 *) dst;
624 u8 __iomem *src8 = (u8 __iomem *) src;
625
626 for (i = c & 3; i--;)
627 *dst8++ = fb_readb(src8++);
628
629 src = (u32 __iomem *) src8;
630 }
631
632 if (copy_to_user(buf, buffer, c)) {
633 err = -EFAULT;
634 break;
635 }
636 *ppos += c;
637 buf += c;
638 cnt += c;
639 count -= c;
640 }
641
642 kfree(buffer);
643
644 return (err) ? err : cnt;
645 }
646
647 static ssize_t
648 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
649 {
650 unsigned long p = *ppos;
651 struct inode *inode = file->f_path.dentry->d_inode;
652 int fbidx = iminor(inode);
653 struct fb_info *info = registered_fb[fbidx];
654 u32 *buffer, *src;
655 u32 __iomem *dst;
656 int c, i, cnt = 0, err = 0;
657 unsigned long total_size;
658
659 if (!info || !info->screen_base)
660 return -ENODEV;
661
662 if (info->state != FBINFO_STATE_RUNNING)
663 return -EPERM;
664
665 if (info->fbops->fb_write)
666 return info->fbops->fb_write(info, buf, count, ppos);
667
668 total_size = info->screen_size;
669
670 if (total_size == 0)
671 total_size = info->fix.smem_len;
672
673 if (p > total_size)
674 return -EFBIG;
675
676 if (count > total_size) {
677 err = -EFBIG;
678 count = total_size;
679 }
680
681 if (count + p > total_size) {
682 if (!err)
683 err = -ENOSPC;
684
685 count = total_size - p;
686 }
687
688 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
689 GFP_KERNEL);
690 if (!buffer)
691 return -ENOMEM;
692
693 dst = (u32 __iomem *) (info->screen_base + p);
694
695 if (info->fbops->fb_sync)
696 info->fbops->fb_sync(info);
697
698 while (count) {
699 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
700 src = buffer;
701
702 if (copy_from_user(src, buf, c)) {
703 err = -EFAULT;
704 break;
705 }
706
707 for (i = c >> 2; i--; )
708 fb_writel(*src++, dst++);
709
710 if (c & 3) {
711 u8 *src8 = (u8 *) src;
712 u8 __iomem *dst8 = (u8 __iomem *) dst;
713
714 for (i = c & 3; i--; )
715 fb_writeb(*src8++, dst8++);
716
717 dst = (u32 __iomem *) dst8;
718 }
719
720 *ppos += c;
721 buf += c;
722 cnt += c;
723 count -= c;
724 }
725
726 kfree(buffer);
727
728 return (cnt) ? cnt : err;
729 }
730
731 #ifdef CONFIG_KMOD
732 static void try_to_load(int fb)
733 {
734 request_module("fb%d", fb);
735 }
736 #endif /* CONFIG_KMOD */
737
738 int
739 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
740 {
741 struct fb_fix_screeninfo *fix = &info->fix;
742 int xoffset = var->xoffset;
743 int yoffset = var->yoffset;
744 int err = 0, yres = info->var.yres;
745
746 if (var->yoffset > 0) {
747 if (var->vmode & FB_VMODE_YWRAP) {
748 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
749 err = -EINVAL;
750 else
751 yres = 0;
752 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
753 err = -EINVAL;
754 }
755
756 if (var->xoffset > 0 && (!fix->xpanstep ||
757 (var->xoffset % fix->xpanstep)))
758 err = -EINVAL;
759
760 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
761 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
762 var->xoffset + info->var.xres > info->var.xres_virtual)
763 return -EINVAL;
764
765 if ((err = info->fbops->fb_pan_display(var, info)))
766 return err;
767 info->var.xoffset = var->xoffset;
768 info->var.yoffset = var->yoffset;
769 if (var->vmode & FB_VMODE_YWRAP)
770 info->var.vmode |= FB_VMODE_YWRAP;
771 else
772 info->var.vmode &= ~FB_VMODE_YWRAP;
773 return 0;
774 }
775
776 int
777 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
778 {
779 int err, flags = info->flags;
780
781 if (var->activate & FB_ACTIVATE_INV_MODE) {
782 struct fb_videomode mode1, mode2;
783 int ret = 0;
784
785 fb_var_to_videomode(&mode1, var);
786 fb_var_to_videomode(&mode2, &info->var);
787 /* make sure we don't delete the videomode of current var */
788 ret = fb_mode_is_equal(&mode1, &mode2);
789
790 if (!ret) {
791 struct fb_event event;
792
793 event.info = info;
794 event.data = &mode1;
795 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
796 }
797
798 if (!ret)
799 fb_delete_videomode(&mode1, &info->modelist);
800
801 return ret;
802 }
803
804 if ((var->activate & FB_ACTIVATE_FORCE) ||
805 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
806 if (!info->fbops->fb_check_var) {
807 *var = info->var;
808 return 0;
809 }
810
811 if ((err = info->fbops->fb_check_var(var, info)))
812 return err;
813
814 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
815 struct fb_videomode mode;
816 int err = 0;
817
818 info->var = *var;
819 if (info->fbops->fb_set_par)
820 info->fbops->fb_set_par(info);
821
822 fb_pan_display(info, &info->var);
823
824 fb_set_cmap(&info->cmap, info);
825
826 fb_var_to_videomode(&mode, &info->var);
827
828 if (info->modelist.prev && info->modelist.next &&
829 !list_empty(&info->modelist))
830 err = fb_add_videomode(&mode, &info->modelist);
831
832 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
833 struct fb_event event;
834 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
835 FB_EVENT_MODE_CHANGE_ALL :
836 FB_EVENT_MODE_CHANGE;
837
838 info->flags &= ~FBINFO_MISC_USEREVENT;
839 event.info = info;
840 fb_notifier_call_chain(evnt, &event);
841 }
842 }
843 }
844 return 0;
845 }
846
847 int
848 fb_blank(struct fb_info *info, int blank)
849 {
850 int ret = -EINVAL;
851
852 if (blank > FB_BLANK_POWERDOWN)
853 blank = FB_BLANK_POWERDOWN;
854
855 if (info->fbops->fb_blank)
856 ret = info->fbops->fb_blank(blank, info);
857
858 if (!ret) {
859 struct fb_event event;
860
861 event.info = info;
862 event.data = &blank;
863 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
864 }
865
866 return ret;
867 }
868
869 static int
870 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
871 unsigned long arg)
872 {
873 int fbidx = iminor(inode);
874 struct fb_info *info = registered_fb[fbidx];
875 struct fb_ops *fb = info->fbops;
876 struct fb_var_screeninfo var;
877 struct fb_fix_screeninfo fix;
878 struct fb_con2fbmap con2fb;
879 struct fb_cmap_user cmap;
880 struct fb_event event;
881 void __user *argp = (void __user *)arg;
882 int i;
883
884 if (!fb)
885 return -ENODEV;
886 switch (cmd) {
887 case FBIOGET_VSCREENINFO:
888 return copy_to_user(argp, &info->var,
889 sizeof(var)) ? -EFAULT : 0;
890 case FBIOPUT_VSCREENINFO:
891 if (copy_from_user(&var, argp, sizeof(var)))
892 return -EFAULT;
893 acquire_console_sem();
894 info->flags |= FBINFO_MISC_USEREVENT;
895 i = fb_set_var(info, &var);
896 info->flags &= ~FBINFO_MISC_USEREVENT;
897 release_console_sem();
898 if (i) return i;
899 if (copy_to_user(argp, &var, sizeof(var)))
900 return -EFAULT;
901 return 0;
902 case FBIOGET_FSCREENINFO:
903 return copy_to_user(argp, &info->fix,
904 sizeof(fix)) ? -EFAULT : 0;
905 case FBIOPUTCMAP:
906 if (copy_from_user(&cmap, argp, sizeof(cmap)))
907 return -EFAULT;
908 return (fb_set_user_cmap(&cmap, info));
909 case FBIOGETCMAP:
910 if (copy_from_user(&cmap, argp, sizeof(cmap)))
911 return -EFAULT;
912 return fb_cmap_to_user(&info->cmap, &cmap);
913 case FBIOPAN_DISPLAY:
914 if (copy_from_user(&var, argp, sizeof(var)))
915 return -EFAULT;
916 acquire_console_sem();
917 i = fb_pan_display(info, &var);
918 release_console_sem();
919 if (i)
920 return i;
921 if (copy_to_user(argp, &var, sizeof(var)))
922 return -EFAULT;
923 return 0;
924 case FBIO_CURSOR:
925 return -EINVAL;
926 case FBIOGET_CON2FBMAP:
927 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
928 return -EFAULT;
929 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
930 return -EINVAL;
931 con2fb.framebuffer = -1;
932 event.info = info;
933 event.data = &con2fb;
934 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
935 return copy_to_user(argp, &con2fb,
936 sizeof(con2fb)) ? -EFAULT : 0;
937 case FBIOPUT_CON2FBMAP:
938 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
939 return - EFAULT;
940 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
941 return -EINVAL;
942 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
943 return -EINVAL;
944 #ifdef CONFIG_KMOD
945 if (!registered_fb[con2fb.framebuffer])
946 try_to_load(con2fb.framebuffer);
947 #endif /* CONFIG_KMOD */
948 if (!registered_fb[con2fb.framebuffer])
949 return -EINVAL;
950 event.info = info;
951 event.data = &con2fb;
952 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
953 &event);
954 case FBIOBLANK:
955 acquire_console_sem();
956 info->flags |= FBINFO_MISC_USEREVENT;
957 i = fb_blank(info, arg);
958 info->flags &= ~FBINFO_MISC_USEREVENT;
959 release_console_sem();
960 return i;
961 default:
962 if (fb->fb_ioctl == NULL)
963 return -EINVAL;
964 return fb->fb_ioctl(info, cmd, arg);
965 }
966 }
967
968 #ifdef CONFIG_COMPAT
969 struct fb_fix_screeninfo32 {
970 char id[16];
971 compat_caddr_t smem_start;
972 u32 smem_len;
973 u32 type;
974 u32 type_aux;
975 u32 visual;
976 u16 xpanstep;
977 u16 ypanstep;
978 u16 ywrapstep;
979 u32 line_length;
980 compat_caddr_t mmio_start;
981 u32 mmio_len;
982 u32 accel;
983 u16 reserved[3];
984 };
985
986 struct fb_cmap32 {
987 u32 start;
988 u32 len;
989 compat_caddr_t red;
990 compat_caddr_t green;
991 compat_caddr_t blue;
992 compat_caddr_t transp;
993 };
994
995 static int fb_getput_cmap(struct inode *inode, struct file *file,
996 unsigned int cmd, unsigned long arg)
997 {
998 struct fb_cmap_user __user *cmap;
999 struct fb_cmap32 __user *cmap32;
1000 __u32 data;
1001 int err;
1002
1003 cmap = compat_alloc_user_space(sizeof(*cmap));
1004 cmap32 = compat_ptr(arg);
1005
1006 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1007 return -EFAULT;
1008
1009 if (get_user(data, &cmap32->red) ||
1010 put_user(compat_ptr(data), &cmap->red) ||
1011 get_user(data, &cmap32->green) ||
1012 put_user(compat_ptr(data), &cmap->green) ||
1013 get_user(data, &cmap32->blue) ||
1014 put_user(compat_ptr(data), &cmap->blue) ||
1015 get_user(data, &cmap32->transp) ||
1016 put_user(compat_ptr(data), &cmap->transp))
1017 return -EFAULT;
1018
1019 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1020
1021 if (!err) {
1022 if (copy_in_user(&cmap32->start,
1023 &cmap->start,
1024 2 * sizeof(__u32)))
1025 err = -EFAULT;
1026 }
1027 return err;
1028 }
1029
1030 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1031 struct fb_fix_screeninfo32 __user *fix32)
1032 {
1033 __u32 data;
1034 int err;
1035
1036 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1037
1038 data = (__u32) (unsigned long) fix->smem_start;
1039 err |= put_user(data, &fix32->smem_start);
1040
1041 err |= put_user(fix->smem_len, &fix32->smem_len);
1042 err |= put_user(fix->type, &fix32->type);
1043 err |= put_user(fix->type_aux, &fix32->type_aux);
1044 err |= put_user(fix->visual, &fix32->visual);
1045 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1046 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1047 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1048 err |= put_user(fix->line_length, &fix32->line_length);
1049
1050 data = (__u32) (unsigned long) fix->mmio_start;
1051 err |= put_user(data, &fix32->mmio_start);
1052
1053 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1054 err |= put_user(fix->accel, &fix32->accel);
1055 err |= copy_to_user(fix32->reserved, fix->reserved,
1056 sizeof(fix->reserved));
1057
1058 return err;
1059 }
1060
1061 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1062 unsigned int cmd, unsigned long arg)
1063 {
1064 mm_segment_t old_fs;
1065 struct fb_fix_screeninfo fix;
1066 struct fb_fix_screeninfo32 __user *fix32;
1067 int err;
1068
1069 fix32 = compat_ptr(arg);
1070
1071 old_fs = get_fs();
1072 set_fs(KERNEL_DS);
1073 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1074 set_fs(old_fs);
1075
1076 if (!err)
1077 err = do_fscreeninfo_to_user(&fix, fix32);
1078
1079 return err;
1080 }
1081
1082 static long
1083 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1084 {
1085 struct inode *inode = file->f_path.dentry->d_inode;
1086 int fbidx = iminor(inode);
1087 struct fb_info *info = registered_fb[fbidx];
1088 struct fb_ops *fb = info->fbops;
1089 long ret = -ENOIOCTLCMD;
1090
1091 lock_kernel();
1092 switch(cmd) {
1093 case FBIOGET_VSCREENINFO:
1094 case FBIOPUT_VSCREENINFO:
1095 case FBIOPAN_DISPLAY:
1096 case FBIOGET_CON2FBMAP:
1097 case FBIOPUT_CON2FBMAP:
1098 arg = (unsigned long) compat_ptr(arg);
1099 case FBIOBLANK:
1100 ret = fb_ioctl(inode, file, cmd, arg);
1101 break;
1102
1103 case FBIOGET_FSCREENINFO:
1104 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1105 break;
1106
1107 case FBIOGETCMAP:
1108 case FBIOPUTCMAP:
1109 ret = fb_getput_cmap(inode, file, cmd, arg);
1110 break;
1111
1112 default:
1113 if (fb->fb_compat_ioctl)
1114 ret = fb->fb_compat_ioctl(info, cmd, arg);
1115 break;
1116 }
1117 unlock_kernel();
1118 return ret;
1119 }
1120 #endif
1121
1122 static int
1123 fb_mmap(struct file *file, struct vm_area_struct * vma)
1124 {
1125 int fbidx = iminor(file->f_path.dentry->d_inode);
1126 struct fb_info *info = registered_fb[fbidx];
1127 struct fb_ops *fb = info->fbops;
1128 unsigned long off;
1129 #if !defined(__sparc__) || defined(__sparc_v9__)
1130 unsigned long start;
1131 u32 len;
1132 #endif
1133
1134 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1135 return -EINVAL;
1136 off = vma->vm_pgoff << PAGE_SHIFT;
1137 if (!fb)
1138 return -ENODEV;
1139 if (fb->fb_mmap) {
1140 int res;
1141 lock_kernel();
1142 res = fb->fb_mmap(info, vma);
1143 unlock_kernel();
1144 return res;
1145 }
1146
1147 #if defined(__sparc__) && !defined(__sparc_v9__)
1148 /* Should never get here, all fb drivers should have their own
1149 mmap routines */
1150 return -EINVAL;
1151 #else
1152 /* !sparc32... */
1153 lock_kernel();
1154
1155 /* frame buffer memory */
1156 start = info->fix.smem_start;
1157 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1158 if (off >= len) {
1159 /* memory mapped io */
1160 off -= len;
1161 if (info->var.accel_flags) {
1162 unlock_kernel();
1163 return -EINVAL;
1164 }
1165 start = info->fix.mmio_start;
1166 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1167 }
1168 unlock_kernel();
1169 start &= PAGE_MASK;
1170 if ((vma->vm_end - vma->vm_start + off) > len)
1171 return -EINVAL;
1172 off += start;
1173 vma->vm_pgoff = off >> PAGE_SHIFT;
1174 /* This is an IO map - tell maydump to skip this VMA */
1175 vma->vm_flags |= VM_IO | VM_RESERVED;
1176 #if defined(__mc68000__)
1177 #if defined(CONFIG_SUN3)
1178 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1179 #elif defined(CONFIG_MMU)
1180 if (CPU_IS_020_OR_030)
1181 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1182 if (CPU_IS_040_OR_060) {
1183 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1184 /* Use no-cache mode, serialized */
1185 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1186 }
1187 #endif
1188 #elif defined(__powerpc__)
1189 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1190 vma->vm_end - vma->vm_start,
1191 vma->vm_page_prot);
1192 #elif defined(__alpha__)
1193 /* Caching is off in the I/O space quadrant by design. */
1194 #elif defined(__i386__) || defined(__x86_64__)
1195 if (boot_cpu_data.x86 > 3)
1196 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1197 #elif defined(__mips__) || defined(__sparc_v9__)
1198 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1199 #elif defined(__hppa__)
1200 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1201 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1202 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1203 #elif defined(__ia64__)
1204 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1205 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1206 else
1207 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1208 #else
1209 #warning What do we have to do here??
1210 #endif
1211 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1212 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1213 return -EAGAIN;
1214 return 0;
1215 #endif /* !sparc32 */
1216 }
1217
1218 static int
1219 fb_open(struct inode *inode, struct file *file)
1220 {
1221 int fbidx = iminor(inode);
1222 struct fb_info *info;
1223 int res = 0;
1224
1225 if (fbidx >= FB_MAX)
1226 return -ENODEV;
1227 #ifdef CONFIG_KMOD
1228 if (!(info = registered_fb[fbidx]))
1229 try_to_load(fbidx);
1230 #endif /* CONFIG_KMOD */
1231 if (!(info = registered_fb[fbidx]))
1232 return -ENODEV;
1233 if (!try_module_get(info->fbops->owner))
1234 return -ENODEV;
1235 file->private_data = info;
1236 if (info->fbops->fb_open) {
1237 res = info->fbops->fb_open(info,1);
1238 if (res)
1239 module_put(info->fbops->owner);
1240 }
1241 return res;
1242 }
1243
1244 static int
1245 fb_release(struct inode *inode, struct file *file)
1246 {
1247 struct fb_info * const info = file->private_data;
1248
1249 lock_kernel();
1250 if (info->fbops->fb_release)
1251 info->fbops->fb_release(info,1);
1252 module_put(info->fbops->owner);
1253 unlock_kernel();
1254 return 0;
1255 }
1256
1257 static const struct file_operations fb_fops = {
1258 .owner = THIS_MODULE,
1259 .read = fb_read,
1260 .write = fb_write,
1261 .ioctl = fb_ioctl,
1262 #ifdef CONFIG_COMPAT
1263 .compat_ioctl = fb_compat_ioctl,
1264 #endif
1265 .mmap = fb_mmap,
1266 .open = fb_open,
1267 .release = fb_release,
1268 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1269 .get_unmapped_area = get_fb_unmapped_area,
1270 #endif
1271 #ifdef CONFIG_FB_DEFERRED_IO
1272 .fsync = fb_deferred_io_fsync,
1273 #endif
1274 };
1275
1276 struct class *fb_class;
1277 EXPORT_SYMBOL(fb_class);
1278 /**
1279 * register_framebuffer - registers a frame buffer device
1280 * @fb_info: frame buffer info structure
1281 *
1282 * Registers a frame buffer device @fb_info.
1283 *
1284 * Returns negative errno on error, or zero for success.
1285 *
1286 */
1287
1288 int
1289 register_framebuffer(struct fb_info *fb_info)
1290 {
1291 int i;
1292 struct fb_event event;
1293 struct fb_videomode mode;
1294
1295 if (num_registered_fb == FB_MAX)
1296 return -ENXIO;
1297 num_registered_fb++;
1298 for (i = 0 ; i < FB_MAX; i++)
1299 if (!registered_fb[i])
1300 break;
1301 fb_info->node = i;
1302
1303 fb_info->dev = device_create(fb_class, fb_info->device,
1304 MKDEV(FB_MAJOR, i), "fb%d", i);
1305 if (IS_ERR(fb_info->dev)) {
1306 /* Not fatal */
1307 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1308 fb_info->dev = NULL;
1309 } else
1310 fb_init_device(fb_info);
1311
1312 if (fb_info->pixmap.addr == NULL) {
1313 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1314 if (fb_info->pixmap.addr) {
1315 fb_info->pixmap.size = FBPIXMAPSIZE;
1316 fb_info->pixmap.buf_align = 1;
1317 fb_info->pixmap.scan_align = 1;
1318 fb_info->pixmap.access_align = 32;
1319 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1320 }
1321 }
1322 fb_info->pixmap.offset = 0;
1323
1324 if (!fb_info->pixmap.blit_x)
1325 fb_info->pixmap.blit_x = ~(u32)0;
1326
1327 if (!fb_info->pixmap.blit_y)
1328 fb_info->pixmap.blit_y = ~(u32)0;
1329
1330 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1331 INIT_LIST_HEAD(&fb_info->modelist);
1332
1333 fb_var_to_videomode(&mode, &fb_info->var);
1334 fb_add_videomode(&mode, &fb_info->modelist);
1335 registered_fb[i] = fb_info;
1336
1337 event.info = fb_info;
1338 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1339 return 0;
1340 }
1341
1342
1343 /**
1344 * unregister_framebuffer - releases a frame buffer device
1345 * @fb_info: frame buffer info structure
1346 *
1347 * Unregisters a frame buffer device @fb_info.
1348 *
1349 * Returns negative errno on error, or zero for success.
1350 *
1351 */
1352
1353 int
1354 unregister_framebuffer(struct fb_info *fb_info)
1355 {
1356 struct fb_event event;
1357 int i;
1358
1359 i = fb_info->node;
1360 if (!registered_fb[i])
1361 return -EINVAL;
1362
1363 if (fb_info->pixmap.addr &&
1364 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1365 kfree(fb_info->pixmap.addr);
1366 fb_destroy_modelist(&fb_info->modelist);
1367 registered_fb[i]=NULL;
1368 num_registered_fb--;
1369 fb_cleanup_device(fb_info);
1370 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1371 event.info = fb_info;
1372 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1373 return 0;
1374 }
1375
1376 /**
1377 * fb_set_suspend - low level driver signals suspend
1378 * @info: framebuffer affected
1379 * @state: 0 = resuming, !=0 = suspending
1380 *
1381 * This is meant to be used by low level drivers to
1382 * signal suspend/resume to the core & clients.
1383 * It must be called with the console semaphore held
1384 */
1385 void fb_set_suspend(struct fb_info *info, int state)
1386 {
1387 struct fb_event event;
1388
1389 event.info = info;
1390 if (state) {
1391 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1392 info->state = FBINFO_STATE_SUSPENDED;
1393 } else {
1394 info->state = FBINFO_STATE_RUNNING;
1395 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1396 }
1397 }
1398
1399 /**
1400 * fbmem_init - init frame buffer subsystem
1401 *
1402 * Initialize the frame buffer subsystem.
1403 *
1404 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1405 *
1406 */
1407
1408 static int __init
1409 fbmem_init(void)
1410 {
1411 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1412
1413 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1414 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1415
1416 fb_class = class_create(THIS_MODULE, "graphics");
1417 if (IS_ERR(fb_class)) {
1418 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1419 fb_class = NULL;
1420 }
1421 return 0;
1422 }
1423
1424 #ifdef MODULE
1425 module_init(fbmem_init);
1426 static void __exit
1427 fbmem_exit(void)
1428 {
1429 class_destroy(fb_class);
1430 unregister_chrdev(FB_MAJOR, "fb");
1431 }
1432
1433 module_exit(fbmem_exit);
1434 MODULE_LICENSE("GPL");
1435 MODULE_DESCRIPTION("Framebuffer base");
1436 #else
1437 subsys_initcall(fbmem_init);
1438 #endif
1439
1440 int fb_new_modelist(struct fb_info *info)
1441 {
1442 struct fb_event event;
1443 struct fb_var_screeninfo var = info->var;
1444 struct list_head *pos, *n;
1445 struct fb_modelist *modelist;
1446 struct fb_videomode *m, mode;
1447 int err = 1;
1448
1449 list_for_each_safe(pos, n, &info->modelist) {
1450 modelist = list_entry(pos, struct fb_modelist, list);
1451 m = &modelist->mode;
1452 fb_videomode_to_var(&var, m);
1453 var.activate = FB_ACTIVATE_TEST;
1454 err = fb_set_var(info, &var);
1455 fb_var_to_videomode(&mode, &var);
1456 if (err || !fb_mode_is_equal(m, &mode)) {
1457 list_del(pos);
1458 kfree(pos);
1459 }
1460 }
1461
1462 err = 1;
1463
1464 if (!list_empty(&info->modelist)) {
1465 event.info = info;
1466 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1467 }
1468
1469 return err;
1470 }
1471
1472 static char *video_options[FB_MAX] __read_mostly;
1473 static int ofonly __read_mostly;
1474
1475 extern const char *global_mode_option;
1476
1477 /**
1478 * fb_get_options - get kernel boot parameters
1479 * @name: framebuffer name as it would appear in
1480 * the boot parameter line
1481 * (video=<name>:<options>)
1482 * @option: the option will be stored here
1483 *
1484 * NOTE: Needed to maintain backwards compatibility
1485 */
1486 int fb_get_options(char *name, char **option)
1487 {
1488 char *opt, *options = NULL;
1489 int opt_len, retval = 0;
1490 int name_len = strlen(name), i;
1491
1492 if (name_len && ofonly && strncmp(name, "offb", 4))
1493 retval = 1;
1494
1495 if (name_len && !retval) {
1496 for (i = 0; i < FB_MAX; i++) {
1497 if (video_options[i] == NULL)
1498 continue;
1499 opt_len = strlen(video_options[i]);
1500 if (!opt_len)
1501 continue;
1502 opt = video_options[i];
1503 if (!strncmp(name, opt, name_len) &&
1504 opt[name_len] == ':')
1505 options = opt + name_len + 1;
1506 }
1507 }
1508 if (options && !strncmp(options, "off", 3))
1509 retval = 1;
1510
1511 if (option)
1512 *option = options;
1513
1514 return retval;
1515 }
1516
1517 #ifndef MODULE
1518 /**
1519 * video_setup - process command line options
1520 * @options: string of options
1521 *
1522 * Process command line options for frame buffer subsystem.
1523 *
1524 * NOTE: This function is a __setup and __init function.
1525 * It only stores the options. Drivers have to call
1526 * fb_get_options() as necessary.
1527 *
1528 * Returns zero.
1529 *
1530 */
1531 static int __init video_setup(char *options)
1532 {
1533 int i, global = 0;
1534
1535 if (!options || !*options)
1536 global = 1;
1537
1538 if (!global && !strncmp(options, "ofonly", 6)) {
1539 ofonly = 1;
1540 global = 1;
1541 }
1542
1543 if (!global && !strstr(options, "fb:")) {
1544 global_mode_option = options;
1545 global = 1;
1546 }
1547
1548 if (!global) {
1549 for (i = 0; i < FB_MAX; i++) {
1550 if (video_options[i] == NULL) {
1551 video_options[i] = options;
1552 break;
1553 }
1554
1555 }
1556 }
1557
1558 return 1;
1559 }
1560 __setup("video=", video_setup);
1561 #endif
1562
1563 /*
1564 * Visible symbols for modules
1565 */
1566
1567 EXPORT_SYMBOL(register_framebuffer);
1568 EXPORT_SYMBOL(unregister_framebuffer);
1569 EXPORT_SYMBOL(num_registered_fb);
1570 EXPORT_SYMBOL(registered_fb);
1571 EXPORT_SYMBOL(fb_prepare_logo);
1572 EXPORT_SYMBOL(fb_show_logo);
1573 EXPORT_SYMBOL(fb_set_var);
1574 EXPORT_SYMBOL(fb_blank);
1575 EXPORT_SYMBOL(fb_pan_display);
1576 EXPORT_SYMBOL(fb_get_buffer_offset);
1577 EXPORT_SYMBOL(fb_set_suspend);
1578 EXPORT_SYMBOL(fb_get_options);
1579
1580 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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