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[PATCH] Add section on function return values to CodingStyle
[linux-2.6/mini2440.git] / drivers / video / fbmem.c
blob17961e3ecaa07ed1b9572868e5af8055f1b91760
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/sched.h>
20 #include <linux/smp_lock.h>
21 #include <linux/kernel.h>
22 #include <linux/major.h>
23 #include <linux/slab.h>
24 #include <linux/mm.h>
25 #include <linux/mman.h>
26 #include <linux/vt.h>
27 #include <linux/init.h>
28 #include <linux/linux_logo.h>
29 #include <linux/proc_fs.h>
30 #include <linux/console.h>
31 #ifdef CONFIG_KMOD
32 #include <linux/kmod.h>
33 #endif
34 #include <linux/err.h>
35 #include <linux/device.h>
36 #include <linux/efi.h>
37
38 #if defined(__mc68000__) || defined(CONFIG_APUS)
39 #include <asm/setup.h>
40 #endif
41
42 #include <asm/io.h>
43 #include <asm/uaccess.h>
44 #include <asm/page.h>
45 #include <asm/pgtable.h>
46
47 #include <linux/fb.h>
48
49 /*
50 * Frame buffer device initialization and setup routines
51 */
52
53 #define FBPIXMAPSIZE (1024 * 8)
54
55 struct fb_info *registered_fb[FB_MAX];
56 int num_registered_fb;
57
58 /*
59 * Helpers
60 */
61
62 int fb_get_color_depth(struct fb_var_screeninfo *var,
63 struct fb_fix_screeninfo *fix)
64 {
65 int depth = 0;
66
67 if (fix->visual == FB_VISUAL_MONO01 ||
68 fix->visual == FB_VISUAL_MONO10)
69 depth = 1;
70 else {
71 if (var->green.length == var->blue.length &&
72 var->green.length == var->red.length &&
73 var->green.offset == var->blue.offset &&
74 var->green.offset == var->red.offset)
75 depth = var->green.length;
76 else
77 depth = var->green.length + var->red.length +
78 var->blue.length;
79 }
80
81 return depth;
82 }
83 EXPORT_SYMBOL(fb_get_color_depth);
84
85 /*
86 * Data padding functions.
87 */
88 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
89 {
90 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
91 }
92 EXPORT_SYMBOL(fb_pad_aligned_buffer);
93
94 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
95 u32 shift_high, u32 shift_low, u32 mod)
96 {
97 u8 mask = (u8) (0xfff << shift_high), tmp;
98 int i, j;
99
100 for (i = height; i--; ) {
101 for (j = 0; j < idx; j++) {
102 tmp = dst[j];
103 tmp &= mask;
104 tmp |= *src >> shift_low;
105 dst[j] = tmp;
106 tmp = *src << shift_high;
107 dst[j+1] = tmp;
108 src++;
109 }
110 tmp = dst[idx];
111 tmp &= mask;
112 tmp |= *src >> shift_low;
113 dst[idx] = tmp;
114 if (shift_high < mod) {
115 tmp = *src << shift_high;
116 dst[idx+1] = tmp;
117 }
118 src++;
119 dst += d_pitch;
120 }
121 }
122 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
123
124 /*
125 * we need to lock this section since fb_cursor
126 * may use fb_imageblit()
127 */
128 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
129 {
130 u32 align = buf->buf_align - 1, offset;
131 char *addr = buf->addr;
132
133 /* If IO mapped, we need to sync before access, no sharing of
134 * the pixmap is done
135 */
136 if (buf->flags & FB_PIXMAP_IO) {
137 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
138 info->fbops->fb_sync(info);
139 return addr;
140 }
141
142 /* See if we fit in the remaining pixmap space */
143 offset = buf->offset + align;
144 offset &= ~align;
145 if (offset + size > buf->size) {
146 /* We do not fit. In order to be able to re-use the buffer,
147 * we must ensure no asynchronous DMA'ing or whatever operation
148 * is in progress, we sync for that.
149 */
150 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
151 info->fbops->fb_sync(info);
152 offset = 0;
153 }
154 buf->offset = offset + size;
155 addr += offset;
156
157 return addr;
158 }
159
160 #ifdef CONFIG_LOGO
161
162 static inline unsigned safe_shift(unsigned d, int n)
163 {
164 return n < 0 ? d >> -n : d << n;
165 }
166
167 static void fb_set_logocmap(struct fb_info *info,
168 const struct linux_logo *logo)
169 {
170 struct fb_cmap palette_cmap;
171 u16 palette_green[16];
172 u16 palette_blue[16];
173 u16 palette_red[16];
174 int i, j, n;
175 const unsigned char *clut = logo->clut;
176
177 palette_cmap.start = 0;
178 palette_cmap.len = 16;
179 palette_cmap.red = palette_red;
180 palette_cmap.green = palette_green;
181 palette_cmap.blue = palette_blue;
182 palette_cmap.transp = NULL;
183
184 for (i = 0; i < logo->clutsize; i += n) {
185 n = logo->clutsize - i;
186 /* palette_cmap provides space for only 16 colors at once */
187 if (n > 16)
188 n = 16;
189 palette_cmap.start = 32 + i;
190 palette_cmap.len = n;
191 for (j = 0; j < n; ++j) {
192 palette_cmap.red[j] = clut[0] << 8 | clut[0];
193 palette_cmap.green[j] = clut[1] << 8 | clut[1];
194 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
195 clut += 3;
196 }
197 fb_set_cmap(&palette_cmap, info);
198 }
199 }
200
201 static void fb_set_logo_truepalette(struct fb_info *info,
202 const struct linux_logo *logo,
203 u32 *palette)
204 {
205 unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
206 unsigned char redmask, greenmask, bluemask;
207 int redshift, greenshift, blueshift;
208 int i;
209 const unsigned char *clut = logo->clut;
210
211 /*
212 * We have to create a temporary palette since console palette is only
213 * 16 colors long.
214 */
215 /* Bug: Doesn't obey msb_right ... (who needs that?) */
216 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
217 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
218 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
219 redshift = info->var.red.offset - (8 - info->var.red.length);
220 greenshift = info->var.green.offset - (8 - info->var.green.length);
221 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
222
223 for ( i = 0; i < logo->clutsize; i++) {
224 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
225 safe_shift((clut[1] & greenmask), greenshift) |
226 safe_shift((clut[2] & bluemask), blueshift));
227 clut += 3;
228 }
229 }
230
231 static void fb_set_logo_directpalette(struct fb_info *info,
232 const struct linux_logo *logo,
233 u32 *palette)
234 {
235 int redshift, greenshift, blueshift;
236 int i;
237
238 redshift = info->var.red.offset;
239 greenshift = info->var.green.offset;
240 blueshift = info->var.blue.offset;
241
242 for (i = 32; i < logo->clutsize; i++)
243 palette[i] = i << redshift | i << greenshift | i << blueshift;
244 }
245
246 static void fb_set_logo(struct fb_info *info,
247 const struct linux_logo *logo, u8 *dst,
248 int depth)
249 {
250 int i, j, k;
251 const u8 *src = logo->data;
252 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
253 u8 fg = 1, d;
254
255 if (fb_get_color_depth(&info->var, &info->fix) == 3)
256 fg = 7;
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;
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;
359 image->dy = info->var.yres - image->height;
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 image->dx = info->var.xres - image->width;
367 } else if (rotate == FB_ROTATE_CCW) {
368 fb_rotate_logo_ccw(image->data, dst, image->width,
369 image->height);
370 tmp = image->width;
371 image->width = image->height;
372 image->height = tmp;
373 image->dy = info->var.yres - image->height;
374 }
375
376 image->data = dst;
377 }
378
379 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
380 int rotate)
381 {
382 int x;
383
384 if (rotate == FB_ROTATE_UR) {
385 for (x = 0; x < num_online_cpus() &&
386 x * (fb_logo.logo->width + 8) <=
387 info->var.xres - fb_logo.logo->width; x++) {
388 info->fbops->fb_imageblit(info, image);
389 image->dx += fb_logo.logo->width + 8;
390 }
391 } else if (rotate == FB_ROTATE_UD) {
392 for (x = 0; x < num_online_cpus() &&
393 x * (fb_logo.logo->width + 8) <=
394 info->var.xres - fb_logo.logo->width; x++) {
395 info->fbops->fb_imageblit(info, image);
396 image->dx -= fb_logo.logo->width + 8;
397 }
398 } else if (rotate == FB_ROTATE_CW) {
399 for (x = 0; x < num_online_cpus() &&
400 x * (fb_logo.logo->width + 8) <=
401 info->var.yres - fb_logo.logo->width; x++) {
402 info->fbops->fb_imageblit(info, image);
403 image->dy += fb_logo.logo->width + 8;
404 }
405 } else if (rotate == FB_ROTATE_CCW) {
406 for (x = 0; x < num_online_cpus() &&
407 x * (fb_logo.logo->width + 8) <=
408 info->var.yres - fb_logo.logo->width; x++) {
409 info->fbops->fb_imageblit(info, image);
410 image->dy -= fb_logo.logo->width + 8;
411 }
412 }
413 }
414
415 int fb_prepare_logo(struct fb_info *info, int rotate)
416 {
417 int depth = fb_get_color_depth(&info->var, &info->fix);
418 int yres;
419
420 memset(&fb_logo, 0, sizeof(struct logo_data));
421
422 if (info->flags & FBINFO_MISC_TILEBLITTING)
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 return 0;
489
490 image.depth = 8;
491 image.data = fb_logo.logo->data;
492
493 if (fb_logo.needs_cmapreset)
494 fb_set_logocmap(info, fb_logo.logo);
495
496 if (fb_logo.needs_truepalette ||
497 fb_logo.needs_directpalette) {
498 palette = kmalloc(256 * 4, GFP_KERNEL);
499 if (palette == NULL)
500 return 0;
501
502 if (fb_logo.needs_truepalette)
503 fb_set_logo_truepalette(info, fb_logo.logo, palette);
504 else
505 fb_set_logo_directpalette(info, fb_logo.logo, palette);
506
507 saved_pseudo_palette = info->pseudo_palette;
508 info->pseudo_palette = palette;
509 }
510
511 if (fb_logo.depth <= 4) {
512 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
513 GFP_KERNEL);
514 if (logo_new == NULL) {
515 kfree(palette);
516 if (saved_pseudo_palette)
517 info->pseudo_palette = saved_pseudo_palette;
518 return 0;
519 }
520 image.data = logo_new;
521 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
522 }
523
524 image.dx = 0;
525 image.dy = 0;
526 image.width = fb_logo.logo->width;
527 image.height = fb_logo.logo->height;
528
529 if (rotate) {
530 logo_rotate = kmalloc(fb_logo.logo->width *
531 fb_logo.logo->height, GFP_KERNEL);
532 if (logo_rotate)
533 fb_rotate_logo(info, logo_rotate, &image, rotate);
534 }
535
536 fb_do_show_logo(info, &image, rotate);
537
538 kfree(palette);
539 if (saved_pseudo_palette != NULL)
540 info->pseudo_palette = saved_pseudo_palette;
541 kfree(logo_new);
542 kfree(logo_rotate);
543 return fb_logo.logo->height;
544 }
545 #else
546 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
547 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
548 #endif /* CONFIG_LOGO */
549
550 static int fbmem_read_proc(char *buf, char **start, off_t offset,
551 int len, int *eof, void *private)
552 {
553 struct fb_info **fi;
554 int clen;
555
556 clen = 0;
557 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
558 if (*fi)
559 clen += sprintf(buf + clen, "%d %s\n",
560 (*fi)->node,
561 (*fi)->fix.id);
562 *start = buf + offset;
563 if (clen > offset)
564 clen -= offset;
565 else
566 clen = 0;
567 return clen < len ? clen : len;
568 }
569
570 static ssize_t
571 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
572 {
573 unsigned long p = *ppos;
574 struct inode *inode = file->f_dentry->d_inode;
575 int fbidx = iminor(inode);
576 struct fb_info *info = registered_fb[fbidx];
577 u32 *buffer, *dst;
578 u32 __iomem *src;
579 int c, i, cnt = 0, err = 0;
580 unsigned long total_size;
581
582 if (!info || ! info->screen_base)
583 return -ENODEV;
584
585 if (info->state != FBINFO_STATE_RUNNING)
586 return -EPERM;
587
588 if (info->fbops->fb_read)
589 return info->fbops->fb_read(file, buf, count, ppos);
590
591 total_size = info->screen_size;
592
593 if (total_size == 0)
594 total_size = info->fix.smem_len;
595
596 if (p >= total_size)
597 return 0;
598
599 if (count >= total_size)
600 count = total_size;
601
602 if (count + p > total_size)
603 count = total_size - p;
604
605 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
606 GFP_KERNEL);
607 if (!buffer)
608 return -ENOMEM;
609
610 src = (u32 __iomem *) (info->screen_base + p);
611
612 if (info->fbops->fb_sync)
613 info->fbops->fb_sync(info);
614
615 while (count) {
616 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
617 dst = buffer;
618 for (i = c >> 2; i--; )
619 *dst++ = fb_readl(src++);
620 if (c & 3) {
621 u8 *dst8 = (u8 *) dst;
622 u8 __iomem *src8 = (u8 __iomem *) src;
623
624 for (i = c & 3; i--;)
625 *dst8++ = fb_readb(src8++);
626
627 src = (u32 __iomem *) src8;
628 }
629
630 if (copy_to_user(buf, buffer, c)) {
631 err = -EFAULT;
632 break;
633 }
634 *ppos += c;
635 buf += c;
636 cnt += c;
637 count -= c;
638 }
639
640 kfree(buffer);
641
642 return (err) ? err : cnt;
643 }
644
645 static ssize_t
646 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
647 {
648 unsigned long p = *ppos;
649 struct inode *inode = file->f_dentry->d_inode;
650 int fbidx = iminor(inode);
651 struct fb_info *info = registered_fb[fbidx];
652 u32 *buffer, *src;
653 u32 __iomem *dst;
654 int c, i, cnt = 0, err = 0;
655 unsigned long total_size;
656
657 if (!info || !info->screen_base)
658 return -ENODEV;
659
660 if (info->state != FBINFO_STATE_RUNNING)
661 return -EPERM;
662
663 if (info->fbops->fb_write)
664 return info->fbops->fb_write(file, buf, count, ppos);
665
666 total_size = info->screen_size;
667
668 if (total_size == 0)
669 total_size = info->fix.smem_len;
670
671 if (p > total_size)
672 return -EFBIG;
673
674 if (count > total_size) {
675 err = -EFBIG;
676 count = total_size;
677 }
678
679 if (count + p > total_size) {
680 if (!err)
681 err = -ENOSPC;
682
683 count = total_size - p;
684 }
685
686 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
687 GFP_KERNEL);
688 if (!buffer)
689 return -ENOMEM;
690
691 dst = (u32 __iomem *) (info->screen_base + p);
692
693 if (info->fbops->fb_sync)
694 info->fbops->fb_sync(info);
695
696 while (count) {
697 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
698 src = buffer;
699
700 if (copy_from_user(src, buf, c)) {
701 err = -EFAULT;
702 break;
703 }
704
705 for (i = c >> 2; i--; )
706 fb_writel(*src++, dst++);
707
708 if (c & 3) {
709 u8 *src8 = (u8 *) src;
710 u8 __iomem *dst8 = (u8 __iomem *) dst;
711
712 for (i = c & 3; i--; )
713 fb_writeb(*src8++, dst8++);
714
715 dst = (u32 __iomem *) dst8;
716 }
717
718 *ppos += c;
719 buf += c;
720 cnt += c;
721 count -= c;
722 }
723
724 kfree(buffer);
725
726 return (cnt) ? cnt : err;
727 }
728
729 #ifdef CONFIG_KMOD
730 static void try_to_load(int fb)
731 {
732 request_module("fb%d", fb);
733 }
734 #endif /* CONFIG_KMOD */
735
736 int
737 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
738 {
739 struct fb_fix_screeninfo *fix = &info->fix;
740 int xoffset = var->xoffset;
741 int yoffset = var->yoffset;
742 int err = 0, yres = info->var.yres;
743
744 if (var->yoffset > 0) {
745 if (var->vmode & FB_VMODE_YWRAP) {
746 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
747 err = -EINVAL;
748 else
749 yres = 0;
750 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
751 err = -EINVAL;
752 }
753
754 if (var->xoffset > 0 && (!fix->xpanstep ||
755 (var->xoffset % fix->xpanstep)))
756 err = -EINVAL;
757
758 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
759 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
760 var->xoffset + info->var.xres > info->var.xres_virtual)
761 return -EINVAL;
762
763 if ((err = info->fbops->fb_pan_display(var, info)))
764 return err;
765 info->var.xoffset = var->xoffset;
766 info->var.yoffset = var->yoffset;
767 if (var->vmode & FB_VMODE_YWRAP)
768 info->var.vmode |= FB_VMODE_YWRAP;
769 else
770 info->var.vmode &= ~FB_VMODE_YWRAP;
771 return 0;
772 }
773
774 int
775 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
776 {
777 int err, flags = info->flags;
778
779 if (var->activate & FB_ACTIVATE_INV_MODE) {
780 struct fb_videomode mode1, mode2;
781 int ret = 0;
782
783 fb_var_to_videomode(&mode1, var);
784 fb_var_to_videomode(&mode2, &info->var);
785 /* make sure we don't delete the videomode of current var */
786 ret = fb_mode_is_equal(&mode1, &mode2);
787
788 if (!ret) {
789 struct fb_event event;
790
791 event.info = info;
792 event.data = &mode1;
793 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
794 }
795
796 if (!ret)
797 fb_delete_videomode(&mode1, &info->modelist);
798
799 return ret;
800 }
801
802 if ((var->activate & FB_ACTIVATE_FORCE) ||
803 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
804 if (!info->fbops->fb_check_var) {
805 *var = info->var;
806 return 0;
807 }
808
809 if ((err = info->fbops->fb_check_var(var, info)))
810 return err;
811
812 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
813 struct fb_videomode mode;
814 int err = 0;
815
816 info->var = *var;
817 if (info->fbops->fb_set_par)
818 info->fbops->fb_set_par(info);
819
820 fb_pan_display(info, &info->var);
821
822 fb_set_cmap(&info->cmap, info);
823
824 fb_var_to_videomode(&mode, &info->var);
825
826 if (info->modelist.prev && info->modelist.next &&
827 !list_empty(&info->modelist))
828 err = fb_add_videomode(&mode, &info->modelist);
829
830 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
831 struct fb_event event;
832 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
833 FB_EVENT_MODE_CHANGE_ALL :
834 FB_EVENT_MODE_CHANGE;
835
836 info->flags &= ~FBINFO_MISC_USEREVENT;
837 event.info = info;
838 fb_notifier_call_chain(evnt, &event);
839 }
840 }
841 }
842 return 0;
843 }
844
845 int
846 fb_blank(struct fb_info *info, int blank)
847 {
848 int ret = -EINVAL;
849
850 if (blank > FB_BLANK_POWERDOWN)
851 blank = FB_BLANK_POWERDOWN;
852
853 if (info->fbops->fb_blank)
854 ret = info->fbops->fb_blank(blank, info);
855
856 if (!ret) {
857 struct fb_event event;
858
859 event.info = info;
860 event.data = &blank;
861 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
862 }
863
864 return ret;
865 }
866
867 static int
868 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
869 unsigned long arg)
870 {
871 int fbidx = iminor(inode);
872 struct fb_info *info = registered_fb[fbidx];
873 struct fb_ops *fb = info->fbops;
874 struct fb_var_screeninfo var;
875 struct fb_fix_screeninfo fix;
876 struct fb_con2fbmap con2fb;
877 struct fb_cmap_user cmap;
878 struct fb_event event;
879 void __user *argp = (void __user *)arg;
880 int i;
881
882 if (!fb)
883 return -ENODEV;
884 switch (cmd) {
885 case FBIOGET_VSCREENINFO:
886 return copy_to_user(argp, &info->var,
887 sizeof(var)) ? -EFAULT : 0;
888 case FBIOPUT_VSCREENINFO:
889 if (copy_from_user(&var, argp, sizeof(var)))
890 return -EFAULT;
891 acquire_console_sem();
892 info->flags |= FBINFO_MISC_USEREVENT;
893 i = fb_set_var(info, &var);
894 info->flags &= ~FBINFO_MISC_USEREVENT;
895 release_console_sem();
896 if (i) return i;
897 if (copy_to_user(argp, &var, sizeof(var)))
898 return -EFAULT;
899 return 0;
900 case FBIOGET_FSCREENINFO:
901 return copy_to_user(argp, &info->fix,
902 sizeof(fix)) ? -EFAULT : 0;
903 case FBIOPUTCMAP:
904 if (copy_from_user(&cmap, argp, sizeof(cmap)))
905 return -EFAULT;
906 return (fb_set_user_cmap(&cmap, info));
907 case FBIOGETCMAP:
908 if (copy_from_user(&cmap, argp, sizeof(cmap)))
909 return -EFAULT;
910 return fb_cmap_to_user(&info->cmap, &cmap);
911 case FBIOPAN_DISPLAY:
912 if (copy_from_user(&var, argp, sizeof(var)))
913 return -EFAULT;
914 acquire_console_sem();
915 i = fb_pan_display(info, &var);
916 release_console_sem();
917 if (i)
918 return i;
919 if (copy_to_user(argp, &var, sizeof(var)))
920 return -EFAULT;
921 return 0;
922 case FBIO_CURSOR:
923 return -EINVAL;
924 case FBIOGET_CON2FBMAP:
925 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
926 return -EFAULT;
927 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
928 return -EINVAL;
929 con2fb.framebuffer = -1;
930 event.info = info;
931 event.data = &con2fb;
932 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
933 return copy_to_user(argp, &con2fb,
934 sizeof(con2fb)) ? -EFAULT : 0;
935 case FBIOPUT_CON2FBMAP:
936 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
937 return - EFAULT;
938 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
939 return -EINVAL;
940 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
941 return -EINVAL;
942 #ifdef CONFIG_KMOD
943 if (!registered_fb[con2fb.framebuffer])
944 try_to_load(con2fb.framebuffer);
945 #endif /* CONFIG_KMOD */
946 if (!registered_fb[con2fb.framebuffer])
947 return -EINVAL;
948 event.info = info;
949 event.data = &con2fb;
950 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
951 &event);
952 case FBIOBLANK:
953 acquire_console_sem();
954 info->flags |= FBINFO_MISC_USEREVENT;
955 i = fb_blank(info, arg);
956 info->flags &= ~FBINFO_MISC_USEREVENT;
957 release_console_sem();
958 return i;
959 default:
960 if (fb->fb_ioctl == NULL)
961 return -EINVAL;
962 return fb->fb_ioctl(info, cmd, arg);
963 }
964 }
965
966 #ifdef CONFIG_COMPAT
967 struct fb_fix_screeninfo32 {
968 char id[16];
969 compat_caddr_t smem_start;
970 u32 smem_len;
971 u32 type;
972 u32 type_aux;
973 u32 visual;
974 u16 xpanstep;
975 u16 ypanstep;
976 u16 ywrapstep;
977 u32 line_length;
978 compat_caddr_t mmio_start;
979 u32 mmio_len;
980 u32 accel;
981 u16 reserved[3];
982 };
983
984 struct fb_cmap32 {
985 u32 start;
986 u32 len;
987 compat_caddr_t red;
988 compat_caddr_t green;
989 compat_caddr_t blue;
990 compat_caddr_t transp;
991 };
992
993 static int fb_getput_cmap(struct inode *inode, struct file *file,
994 unsigned int cmd, unsigned long arg)
995 {
996 struct fb_cmap_user __user *cmap;
997 struct fb_cmap32 __user *cmap32;
998 __u32 data;
999 int err;
1000
1001 cmap = compat_alloc_user_space(sizeof(*cmap));
1002 cmap32 = compat_ptr(arg);
1003
1004 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1005 return -EFAULT;
1006
1007 if (get_user(data, &cmap32->red) ||
1008 put_user(compat_ptr(data), &cmap->red) ||
1009 get_user(data, &cmap32->green) ||
1010 put_user(compat_ptr(data), &cmap->green) ||
1011 get_user(data, &cmap32->blue) ||
1012 put_user(compat_ptr(data), &cmap->blue) ||
1013 get_user(data, &cmap32->transp) ||
1014 put_user(compat_ptr(data), &cmap->transp))
1015 return -EFAULT;
1016
1017 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1018
1019 if (!err) {
1020 if (copy_in_user(&cmap32->start,
1021 &cmap->start,
1022 2 * sizeof(__u32)))
1023 err = -EFAULT;
1024 }
1025 return err;
1026 }
1027
1028 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1029 struct fb_fix_screeninfo32 __user *fix32)
1030 {
1031 __u32 data;
1032 int err;
1033
1034 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1035
1036 data = (__u32) (unsigned long) fix->smem_start;
1037 err |= put_user(data, &fix32->smem_start);
1038
1039 err |= put_user(fix->smem_len, &fix32->smem_len);
1040 err |= put_user(fix->type, &fix32->type);
1041 err |= put_user(fix->type_aux, &fix32->type_aux);
1042 err |= put_user(fix->visual, &fix32->visual);
1043 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1044 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1045 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1046 err |= put_user(fix->line_length, &fix32->line_length);
1047
1048 data = (__u32) (unsigned long) fix->mmio_start;
1049 err |= put_user(data, &fix32->mmio_start);
1050
1051 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1052 err |= put_user(fix->accel, &fix32->accel);
1053 err |= copy_to_user(fix32->reserved, fix->reserved,
1054 sizeof(fix->reserved));
1055
1056 return err;
1057 }
1058
1059 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1060 unsigned int cmd, unsigned long arg)
1061 {
1062 mm_segment_t old_fs;
1063 struct fb_fix_screeninfo fix;
1064 struct fb_fix_screeninfo32 __user *fix32;
1065 int err;
1066
1067 fix32 = compat_ptr(arg);
1068
1069 old_fs = get_fs();
1070 set_fs(KERNEL_DS);
1071 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1072 set_fs(old_fs);
1073
1074 if (!err)
1075 err = do_fscreeninfo_to_user(&fix, fix32);
1076
1077 return err;
1078 }
1079
1080 static long
1081 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1082 {
1083 struct inode *inode = file->f_dentry->d_inode;
1084 int fbidx = iminor(inode);
1085 struct fb_info *info = registered_fb[fbidx];
1086 struct fb_ops *fb = info->fbops;
1087 long ret = -ENOIOCTLCMD;
1088
1089 lock_kernel();
1090 switch(cmd) {
1091 case FBIOGET_VSCREENINFO:
1092 case FBIOPUT_VSCREENINFO:
1093 case FBIOPAN_DISPLAY:
1094 case FBIOGET_CON2FBMAP:
1095 case FBIOPUT_CON2FBMAP:
1096 arg = (unsigned long) compat_ptr(arg);
1097 case FBIOBLANK:
1098 ret = fb_ioctl(inode, file, cmd, arg);
1099 break;
1100
1101 case FBIOGET_FSCREENINFO:
1102 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1103 break;
1104
1105 case FBIOGETCMAP:
1106 case FBIOPUTCMAP:
1107 ret = fb_getput_cmap(inode, file, cmd, arg);
1108 break;
1109
1110 default:
1111 if (fb->fb_compat_ioctl)
1112 ret = fb->fb_compat_ioctl(info, cmd, arg);
1113 break;
1114 }
1115 unlock_kernel();
1116 return ret;
1117 }
1118 #endif
1119
1120 static int
1121 fb_mmap(struct file *file, struct vm_area_struct * vma)
1122 {
1123 int fbidx = iminor(file->f_dentry->d_inode);
1124 struct fb_info *info = registered_fb[fbidx];
1125 struct fb_ops *fb = info->fbops;
1126 unsigned long off;
1127 #if !defined(__sparc__) || defined(__sparc_v9__)
1128 unsigned long start;
1129 u32 len;
1130 #endif
1131
1132 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1133 return -EINVAL;
1134 off = vma->vm_pgoff << PAGE_SHIFT;
1135 if (!fb)
1136 return -ENODEV;
1137 if (fb->fb_mmap) {
1138 int res;
1139 lock_kernel();
1140 res = fb->fb_mmap(info, vma);
1141 unlock_kernel();
1142 return res;
1143 }
1144
1145 #if defined(__sparc__) && !defined(__sparc_v9__)
1146 /* Should never get here, all fb drivers should have their own
1147 mmap routines */
1148 return -EINVAL;
1149 #else
1150 /* !sparc32... */
1151 lock_kernel();
1152
1153 /* frame buffer memory */
1154 start = info->fix.smem_start;
1155 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1156 if (off >= len) {
1157 /* memory mapped io */
1158 off -= len;
1159 if (info->var.accel_flags) {
1160 unlock_kernel();
1161 return -EINVAL;
1162 }
1163 start = info->fix.mmio_start;
1164 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1165 }
1166 unlock_kernel();
1167 start &= PAGE_MASK;
1168 if ((vma->vm_end - vma->vm_start + off) > len)
1169 return -EINVAL;
1170 off += start;
1171 vma->vm_pgoff = off >> PAGE_SHIFT;
1172 /* This is an IO map - tell maydump to skip this VMA */
1173 vma->vm_flags |= VM_IO | VM_RESERVED;
1174 #if defined(__mc68000__)
1175 #if defined(CONFIG_SUN3)
1176 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1177 #elif defined(CONFIG_MMU)
1178 if (CPU_IS_020_OR_030)
1179 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1180 if (CPU_IS_040_OR_060) {
1181 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1182 /* Use no-cache mode, serialized */
1183 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1184 }
1185 #endif
1186 #elif defined(__powerpc__)
1187 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1188 vma->vm_end - vma->vm_start,
1189 vma->vm_page_prot);
1190 #elif defined(__alpha__)
1191 /* Caching is off in the I/O space quadrant by design. */
1192 #elif defined(__i386__) || defined(__x86_64__)
1193 if (boot_cpu_data.x86 > 3)
1194 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1195 #elif defined(__mips__) || defined(__sparc_v9__)
1196 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1197 #elif defined(__hppa__)
1198 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1199 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1200 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1201 #elif defined(__ia64__)
1202 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1203 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1204 else
1205 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1206 #else
1207 #warning What do we have to do here??
1208 #endif
1209 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1210 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1211 return -EAGAIN;
1212 return 0;
1213 #endif /* !sparc32 */
1214 }
1215
1216 static int
1217 fb_open(struct inode *inode, struct file *file)
1218 {
1219 int fbidx = iminor(inode);
1220 struct fb_info *info;
1221 int res = 0;
1222
1223 if (fbidx >= FB_MAX)
1224 return -ENODEV;
1225 #ifdef CONFIG_KMOD
1226 if (!(info = registered_fb[fbidx]))
1227 try_to_load(fbidx);
1228 #endif /* CONFIG_KMOD */
1229 if (!(info = registered_fb[fbidx]))
1230 return -ENODEV;
1231 if (!try_module_get(info->fbops->owner))
1232 return -ENODEV;
1233 file->private_data = info;
1234 if (info->fbops->fb_open) {
1235 res = info->fbops->fb_open(info,1);
1236 if (res)
1237 module_put(info->fbops->owner);
1238 }
1239 return res;
1240 }
1241
1242 static int
1243 fb_release(struct inode *inode, struct file *file)
1244 {
1245 struct fb_info * const info = file->private_data;
1246
1247 lock_kernel();
1248 if (info->fbops->fb_release)
1249 info->fbops->fb_release(info,1);
1250 module_put(info->fbops->owner);
1251 unlock_kernel();
1252 return 0;
1253 }
1254
1255 static struct file_operations fb_fops = {
1256 .owner = THIS_MODULE,
1257 .read = fb_read,
1258 .write = fb_write,
1259 .ioctl = fb_ioctl,
1260 #ifdef CONFIG_COMPAT
1261 .compat_ioctl = fb_compat_ioctl,
1262 #endif
1263 .mmap = fb_mmap,
1264 .open = fb_open,
1265 .release = fb_release,
1266 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1267 .get_unmapped_area = get_fb_unmapped_area,
1268 #endif
1269 };
1270
1271 struct class *fb_class;
1272 EXPORT_SYMBOL(fb_class);
1273 /**
1274 * register_framebuffer - registers a frame buffer device
1275 * @fb_info: frame buffer info structure
1276 *
1277 * Registers a frame buffer device @fb_info.
1278 *
1279 * Returns negative errno on error, or zero for success.
1280 *
1281 */
1282
1283 int
1284 register_framebuffer(struct fb_info *fb_info)
1285 {
1286 int i;
1287 struct fb_event event;
1288 struct fb_videomode mode;
1289
1290 if (num_registered_fb == FB_MAX)
1291 return -ENXIO;
1292 num_registered_fb++;
1293 for (i = 0 ; i < FB_MAX; i++)
1294 if (!registered_fb[i])
1295 break;
1296 fb_info->node = i;
1297
1298 fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1299 fb_info->device, "fb%d", i);
1300 if (IS_ERR(fb_info->class_device)) {
1301 /* Not fatal */
1302 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1303 fb_info->class_device = NULL;
1304 } else
1305 fb_init_class_device(fb_info);
1306
1307 if (fb_info->pixmap.addr == NULL) {
1308 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1309 if (fb_info->pixmap.addr) {
1310 fb_info->pixmap.size = FBPIXMAPSIZE;
1311 fb_info->pixmap.buf_align = 1;
1312 fb_info->pixmap.scan_align = 1;
1313 fb_info->pixmap.access_align = 32;
1314 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1315 }
1316 }
1317 fb_info->pixmap.offset = 0;
1318
1319 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1320 INIT_LIST_HEAD(&fb_info->modelist);
1321
1322 fb_var_to_videomode(&mode, &fb_info->var);
1323 fb_add_videomode(&mode, &fb_info->modelist);
1324 registered_fb[i] = fb_info;
1325
1326 event.info = fb_info;
1327 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1328 return 0;
1329 }
1330
1331
1332 /**
1333 * unregister_framebuffer - releases a frame buffer device
1334 * @fb_info: frame buffer info structure
1335 *
1336 * Unregisters a frame buffer device @fb_info.
1337 *
1338 * Returns negative errno on error, or zero for success.
1339 *
1340 */
1341
1342 int
1343 unregister_framebuffer(struct fb_info *fb_info)
1344 {
1345 struct fb_event event;
1346 int i;
1347
1348 i = fb_info->node;
1349 if (!registered_fb[i])
1350 return -EINVAL;
1351
1352 if (fb_info->pixmap.addr &&
1353 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1354 kfree(fb_info->pixmap.addr);
1355 fb_destroy_modelist(&fb_info->modelist);
1356 registered_fb[i]=NULL;
1357 num_registered_fb--;
1358 fb_cleanup_class_device(fb_info);
1359 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1360 event.info = fb_info;
1361 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1362 return 0;
1363 }
1364
1365 /**
1366 * fb_set_suspend - low level driver signals suspend
1367 * @info: framebuffer affected
1368 * @state: 0 = resuming, !=0 = suspending
1369 *
1370 * This is meant to be used by low level drivers to
1371 * signal suspend/resume to the core & clients.
1372 * It must be called with the console semaphore held
1373 */
1374 void fb_set_suspend(struct fb_info *info, int state)
1375 {
1376 struct fb_event event;
1377
1378 event.info = info;
1379 if (state) {
1380 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1381 info->state = FBINFO_STATE_SUSPENDED;
1382 } else {
1383 info->state = FBINFO_STATE_RUNNING;
1384 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1385 }
1386 }
1387
1388 /**
1389 * fbmem_init - init frame buffer subsystem
1390 *
1391 * Initialize the frame buffer subsystem.
1392 *
1393 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1394 *
1395 */
1396
1397 static int __init
1398 fbmem_init(void)
1399 {
1400 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1401
1402 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1403 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1404
1405 fb_class = class_create(THIS_MODULE, "graphics");
1406 if (IS_ERR(fb_class)) {
1407 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1408 fb_class = NULL;
1409 }
1410 return 0;
1411 }
1412
1413 #ifdef MODULE
1414 module_init(fbmem_init);
1415 static void __exit
1416 fbmem_exit(void)
1417 {
1418 class_destroy(fb_class);
1419 unregister_chrdev(FB_MAJOR, "fb");
1420 }
1421
1422 module_exit(fbmem_exit);
1423 MODULE_LICENSE("GPL");
1424 MODULE_DESCRIPTION("Framebuffer base");
1425 #else
1426 subsys_initcall(fbmem_init);
1427 #endif
1428
1429 int fb_new_modelist(struct fb_info *info)
1430 {
1431 struct fb_event event;
1432 struct fb_var_screeninfo var = info->var;
1433 struct list_head *pos, *n;
1434 struct fb_modelist *modelist;
1435 struct fb_videomode *m, mode;
1436 int err = 1;
1437
1438 list_for_each_safe(pos, n, &info->modelist) {
1439 modelist = list_entry(pos, struct fb_modelist, list);
1440 m = &modelist->mode;
1441 fb_videomode_to_var(&var, m);
1442 var.activate = FB_ACTIVATE_TEST;
1443 err = fb_set_var(info, &var);
1444 fb_var_to_videomode(&mode, &var);
1445 if (err || !fb_mode_is_equal(m, &mode)) {
1446 list_del(pos);
1447 kfree(pos);
1448 }
1449 }
1450
1451 err = 1;
1452
1453 if (!list_empty(&info->modelist)) {
1454 event.info = info;
1455 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1456 }
1457
1458 return err;
1459 }
1460
1461 static char *video_options[FB_MAX];
1462 static int ofonly;
1463
1464 extern const char *global_mode_option;
1465
1466 /**
1467 * fb_get_options - get kernel boot parameters
1468 * @name: framebuffer name as it would appear in
1469 * the boot parameter line
1470 * (video=<name>:<options>)
1471 * @option: the option will be stored here
1472 *
1473 * NOTE: Needed to maintain backwards compatibility
1474 */
1475 int fb_get_options(char *name, char **option)
1476 {
1477 char *opt, *options = NULL;
1478 int opt_len, retval = 0;
1479 int name_len = strlen(name), i;
1480
1481 if (name_len && ofonly && strncmp(name, "offb", 4))
1482 retval = 1;
1483
1484 if (name_len && !retval) {
1485 for (i = 0; i < FB_MAX; i++) {
1486 if (video_options[i] == NULL)
1487 continue;
1488 opt_len = strlen(video_options[i]);
1489 if (!opt_len)
1490 continue;
1491 opt = video_options[i];
1492 if (!strncmp(name, opt, name_len) &&
1493 opt[name_len] == ':')
1494 options = opt + name_len + 1;
1495 }
1496 }
1497 if (options && !strncmp(options, "off", 3))
1498 retval = 1;
1499
1500 if (option)
1501 *option = options;
1502
1503 return retval;
1504 }
1505
1506 #ifndef MODULE
1507 /**
1508 * video_setup - process command line options
1509 * @options: string of options
1510 *
1511 * Process command line options for frame buffer subsystem.
1512 *
1513 * NOTE: This function is a __setup and __init function.
1514 * It only stores the options. Drivers have to call
1515 * fb_get_options() as necessary.
1516 *
1517 * Returns zero.
1518 *
1519 */
1520 static int __init video_setup(char *options)
1521 {
1522 int i, global = 0;
1523
1524 if (!options || !*options)
1525 global = 1;
1526
1527 if (!global && !strncmp(options, "ofonly", 6)) {
1528 ofonly = 1;
1529 global = 1;
1530 }
1531
1532 if (!global && !strstr(options, "fb:")) {
1533 global_mode_option = options;
1534 global = 1;
1535 }
1536
1537 if (!global) {
1538 for (i = 0; i < FB_MAX; i++) {
1539 if (video_options[i] == NULL) {
1540 video_options[i] = options;
1541 break;
1542 }
1543
1544 }
1545 }
1546
1547 return 1;
1548 }
1549 __setup("video=", video_setup);
1550 #endif
1551
1552 /*
1553 * Visible symbols for modules
1554 */
1555
1556 EXPORT_SYMBOL(register_framebuffer);
1557 EXPORT_SYMBOL(unregister_framebuffer);
1558 EXPORT_SYMBOL(num_registered_fb);
1559 EXPORT_SYMBOL(registered_fb);
1560 EXPORT_SYMBOL(fb_prepare_logo);
1561 EXPORT_SYMBOL(fb_show_logo);
1562 EXPORT_SYMBOL(fb_set_var);
1563 EXPORT_SYMBOL(fb_blank);
1564 EXPORT_SYMBOL(fb_pan_display);
1565 EXPORT_SYMBOL(fb_get_buffer_offset);
1566 EXPORT_SYMBOL(fb_set_suspend);
1567 EXPORT_SYMBOL(fb_get_options);
1568
1569 MODULE_LICENSE("GPL");
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