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[PATCH] fbdev: video_setup() warning fix
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmem.c
blob996c7b58564e33b4f555c9669ff14935b79ae457
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/config.h>
15 #include <linux/module.h>
16
17 #include <linux/compat.h>
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/sched.h>
21 #include <linux/smp_lock.h>
22 #include <linux/kernel.h>
23 #include <linux/major.h>
24 #include <linux/slab.h>
25 #include <linux/mm.h>
26 #include <linux/mman.h>
27 #include <linux/tty.h>
28 #include <linux/init.h>
29 #include <linux/linux_logo.h>
30 #include <linux/proc_fs.h>
31 #include <linux/console.h>
32 #ifdef CONFIG_KMOD
33 #include <linux/kmod.h>
34 #endif
35 #include <linux/devfs_fs_kernel.h>
36 #include <linux/err.h>
37 #include <linux/kernel.h>
38 #include <linux/device.h>
39 #include <linux/efi.h>
40
41 #if defined(__mc68000__) || defined(CONFIG_APUS)
42 #include <asm/setup.h>
43 #endif
44
45 #include <asm/io.h>
46 #include <asm/uaccess.h>
47 #include <asm/page.h>
48 #include <asm/pgtable.h>
49
50 #include <linux/fb.h>
51
52 /*
53 * Frame buffer device initialization and setup routines
54 */
55
56 #define FBPIXMAPSIZE (1024 * 8)
57
58 static struct notifier_block *fb_notifier_list;
59 struct fb_info *registered_fb[FB_MAX];
60 int num_registered_fb;
61
62 /*
63 * Helpers
64 */
65
66 int fb_get_color_depth(struct fb_var_screeninfo *var,
67 struct fb_fix_screeninfo *fix)
68 {
69 int depth = 0;
70
71 if (fix->visual == FB_VISUAL_MONO01 ||
72 fix->visual == FB_VISUAL_MONO10)
73 depth = 1;
74 else {
75 if (var->green.length == var->blue.length &&
76 var->green.length == var->red.length &&
77 var->green.offset == var->blue.offset &&
78 var->green.offset == var->red.offset)
79 depth = var->green.length;
80 else
81 depth = var->green.length + var->red.length +
82 var->blue.length;
83 }
84
85 return depth;
86 }
87 EXPORT_SYMBOL(fb_get_color_depth);
88
89 /*
90 * Data padding functions.
91 */
92 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
93 {
94 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
95 }
96 EXPORT_SYMBOL(fb_pad_aligned_buffer);
97
98 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
99 u32 shift_high, u32 shift_low, u32 mod)
100 {
101 u8 mask = (u8) (0xfff << shift_high), tmp;
102 int i, j;
103
104 for (i = height; i--; ) {
105 for (j = 0; j < idx; j++) {
106 tmp = dst[j];
107 tmp &= mask;
108 tmp |= *src >> shift_low;
109 dst[j] = tmp;
110 tmp = *src << shift_high;
111 dst[j+1] = tmp;
112 src++;
113 }
114 tmp = dst[idx];
115 tmp &= mask;
116 tmp |= *src >> shift_low;
117 dst[idx] = tmp;
118 if (shift_high < mod) {
119 tmp = *src << shift_high;
120 dst[idx+1] = tmp;
121 }
122 src++;
123 dst += d_pitch;
124 }
125 }
126 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
127
128 /*
129 * we need to lock this section since fb_cursor
130 * may use fb_imageblit()
131 */
132 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
133 {
134 u32 align = buf->buf_align - 1, offset;
135 char *addr = buf->addr;
136
137 /* If IO mapped, we need to sync before access, no sharing of
138 * the pixmap is done
139 */
140 if (buf->flags & FB_PIXMAP_IO) {
141 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142 info->fbops->fb_sync(info);
143 return addr;
144 }
145
146 /* See if we fit in the remaining pixmap space */
147 offset = buf->offset + align;
148 offset &= ~align;
149 if (offset + size > buf->size) {
150 /* We do not fit. In order to be able to re-use the buffer,
151 * we must ensure no asynchronous DMA'ing or whatever operation
152 * is in progress, we sync for that.
153 */
154 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
155 info->fbops->fb_sync(info);
156 offset = 0;
157 }
158 buf->offset = offset + size;
159 addr += offset;
160
161 return addr;
162 }
163
164 #ifdef CONFIG_LOGO
165 #include <linux/linux_logo.h>
166
167 static inline unsigned safe_shift(unsigned d, int n)
168 {
169 return n < 0 ? d >> -n : d << n;
170 }
171
172 static void fb_set_logocmap(struct fb_info *info,
173 const struct linux_logo *logo)
174 {
175 struct fb_cmap palette_cmap;
176 u16 palette_green[16];
177 u16 palette_blue[16];
178 u16 palette_red[16];
179 int i, j, n;
180 const unsigned char *clut = logo->clut;
181
182 palette_cmap.start = 0;
183 palette_cmap.len = 16;
184 palette_cmap.red = palette_red;
185 palette_cmap.green = palette_green;
186 palette_cmap.blue = palette_blue;
187 palette_cmap.transp = NULL;
188
189 for (i = 0; i < logo->clutsize; i += n) {
190 n = logo->clutsize - i;
191 /* palette_cmap provides space for only 16 colors at once */
192 if (n > 16)
193 n = 16;
194 palette_cmap.start = 32 + i;
195 palette_cmap.len = n;
196 for (j = 0; j < n; ++j) {
197 palette_cmap.red[j] = clut[0] << 8 | clut[0];
198 palette_cmap.green[j] = clut[1] << 8 | clut[1];
199 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
200 clut += 3;
201 }
202 fb_set_cmap(&palette_cmap, info);
203 }
204 }
205
206 static void fb_set_logo_truepalette(struct fb_info *info,
207 const struct linux_logo *logo,
208 u32 *palette)
209 {
210 unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
211 unsigned char redmask, greenmask, bluemask;
212 int redshift, greenshift, blueshift;
213 int i;
214 const unsigned char *clut = logo->clut;
215
216 /*
217 * We have to create a temporary palette since console palette is only
218 * 16 colors long.
219 */
220 /* Bug: Doesn't obey msb_right ... (who needs that?) */
221 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
222 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
223 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
224 redshift = info->var.red.offset - (8 - info->var.red.length);
225 greenshift = info->var.green.offset - (8 - info->var.green.length);
226 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
227
228 for ( i = 0; i < logo->clutsize; i++) {
229 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
230 safe_shift((clut[1] & greenmask), greenshift) |
231 safe_shift((clut[2] & bluemask), blueshift));
232 clut += 3;
233 }
234 }
235
236 static void fb_set_logo_directpalette(struct fb_info *info,
237 const struct linux_logo *logo,
238 u32 *palette)
239 {
240 int redshift, greenshift, blueshift;
241 int i;
242
243 redshift = info->var.red.offset;
244 greenshift = info->var.green.offset;
245 blueshift = info->var.blue.offset;
246
247 for (i = 32; i < logo->clutsize; i++)
248 palette[i] = i << redshift | i << greenshift | i << blueshift;
249 }
250
251 static void fb_set_logo(struct fb_info *info,
252 const struct linux_logo *logo, u8 *dst,
253 int depth)
254 {
255 int i, j, k;
256 const u8 *src = logo->data;
257 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
258 u8 fg = 1, d;
259
260 if (fb_get_color_depth(&info->var, &info->fix) == 3)
261 fg = 7;
262
263 if (info->fix.visual == FB_VISUAL_MONO01 ||
264 info->fix.visual == FB_VISUAL_MONO10)
265 fg = ~((u8) (0xfff << info->var.green.length));
266
267 switch (depth) {
268 case 4:
269 for (i = 0; i < logo->height; i++)
270 for (j = 0; j < logo->width; src++) {
271 *dst++ = *src >> 4;
272 j++;
273 if (j < logo->width) {
274 *dst++ = *src & 0x0f;
275 j++;
276 }
277 }
278 break;
279 case 1:
280 for (i = 0; i < logo->height; i++) {
281 for (j = 0; j < logo->width; src++) {
282 d = *src ^ xor;
283 for (k = 7; k >= 0; k--) {
284 *dst++ = ((d >> k) & 1) ? fg : 0;
285 j++;
286 }
287 }
288 }
289 break;
290 }
291 }
292
293 /*
294 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
295 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
296 * the visual format and color depth of the framebuffer, the DAC, the
297 * pseudo_palette, and the logo data will be adjusted accordingly.
298 *
299 * Case 1 - linux_logo_clut224:
300 * Color exceeds the number of console colors (16), thus we set the hardware DAC
301 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
302 *
303 * For visuals that require color info from the pseudo_palette, we also construct
304 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
305 * will be set.
306 *
307 * Case 2 - linux_logo_vga16:
308 * The number of colors just matches the console colors, thus there is no need
309 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
310 * each byte contains color information for two pixels (upper and lower nibble).
311 * To be consistent with fb_imageblit() usage, we therefore separate the two
312 * nibbles into separate bytes. The "depth" flag will be set to 4.
313 *
314 * Case 3 - linux_logo_mono:
315 * This is similar with Case 2. Each byte contains information for 8 pixels.
316 * We isolate each bit and expand each into a byte. The "depth" flag will
317 * be set to 1.
318 */
319 static struct logo_data {
320 int depth;
321 int needs_directpalette;
322 int needs_truepalette;
323 int needs_cmapreset;
324 const struct linux_logo *logo;
325 } fb_logo;
326
327 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
328 {
329 u32 size = width * height, i;
330
331 out += size - 1;
332
333 for (i = size; i--; )
334 *out-- = *in++;
335 }
336
337 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
338 {
339 int i, j, w = width - 1;
340
341 for (i = 0; i < height; i++)
342 for (j = 0; j < width; j++)
343 out[height * j + w - i] = *in++;
344 }
345
346 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
347 {
348 int i, j, w = width - 1;
349
350 for (i = 0; i < height; i++)
351 for (j = 0; j < width; j++)
352 out[height * (w - j) + i] = *in++;
353 }
354
355 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
356 struct fb_image *image, int rotate)
357 {
358 u32 tmp;
359
360 if (rotate == FB_ROTATE_UD) {
361 image->dx = info->var.xres - image->width;
362 image->dy = info->var.yres - image->height;
363 fb_rotate_logo_ud(image->data, dst, image->width,
364 image->height);
365 } else if (rotate == FB_ROTATE_CW) {
366 tmp = image->width;
367 image->width = image->height;
368 image->height = tmp;
369 image->dx = info->var.xres - image->height;
370 fb_rotate_logo_cw(image->data, dst, image->width,
371 image->height);
372 } else if (rotate == FB_ROTATE_CCW) {
373 tmp = image->width;
374 image->width = image->height;
375 image->height = tmp;
376 image->dy = info->var.yres - image->width;
377 fb_rotate_logo_ccw(image->data, dst, image->width,
378 image->height);
379 }
380
381 image->data = dst;
382 }
383
384 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
385 int rotate)
386 {
387 int x;
388
389 if (rotate == FB_ROTATE_UR) {
390 for (x = 0; x < num_online_cpus() &&
391 x * (fb_logo.logo->width + 8) <=
392 info->var.xres - fb_logo.logo->width; x++) {
393 info->fbops->fb_imageblit(info, image);
394 image->dx += fb_logo.logo->width + 8;
395 }
396 } else if (rotate == FB_ROTATE_UD) {
397 for (x = 0; x < num_online_cpus() &&
398 x * (fb_logo.logo->width + 8) <=
399 info->var.xres - fb_logo.logo->width; x++) {
400 info->fbops->fb_imageblit(info, image);
401 image->dx -= fb_logo.logo->width + 8;
402 }
403 } else if (rotate == FB_ROTATE_CW) {
404 for (x = 0; x < num_online_cpus() &&
405 x * (fb_logo.logo->width + 8) <=
406 info->var.yres - fb_logo.logo->width; x++) {
407 info->fbops->fb_imageblit(info, image);
408 image->dy += fb_logo.logo->width + 8;
409 }
410 } else if (rotate == FB_ROTATE_CCW) {
411 for (x = 0; x < num_online_cpus() &&
412 x * (fb_logo.logo->width + 8) <=
413 info->var.yres - fb_logo.logo->width; x++) {
414 info->fbops->fb_imageblit(info, image);
415 image->dy -= fb_logo.logo->width + 8;
416 }
417 }
418 }
419
420 int fb_prepare_logo(struct fb_info *info, int rotate)
421 {
422 int depth = fb_get_color_depth(&info->var, &info->fix);
423 int yres;
424
425 memset(&fb_logo, 0, sizeof(struct logo_data));
426
427 if (info->flags & FBINFO_MISC_TILEBLITTING)
428 return 0;
429
430 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
431 depth = info->var.blue.length;
432 if (info->var.red.length < depth)
433 depth = info->var.red.length;
434 if (info->var.green.length < depth)
435 depth = info->var.green.length;
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 0;
673
674 if (count >= total_size)
675 count = total_size;
676
677 if (count + p > total_size)
678 count = total_size - p;
679
680 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
681 GFP_KERNEL);
682 if (!buffer)
683 return -ENOMEM;
684
685 dst = (u32 __iomem *) (info->screen_base + p);
686
687 if (info->fbops->fb_sync)
688 info->fbops->fb_sync(info);
689
690 while (count) {
691 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
692 src = buffer;
693
694 if (copy_from_user(src, buf, c)) {
695 err = -EFAULT;
696 break;
697 }
698
699 for (i = c >> 2; i--; )
700 fb_writel(*src++, dst++);
701
702 if (c & 3) {
703 u8 *src8 = (u8 *) src;
704 u8 __iomem *dst8 = (u8 __iomem *) dst;
705
706 for (i = c & 3; i--; )
707 fb_writeb(*src8++, dst8++);
708
709 dst = (u32 __iomem *) dst8;
710 }
711
712 *ppos += c;
713 buf += c;
714 cnt += c;
715 count -= c;
716 }
717
718 kfree(buffer);
719
720 return (err) ? err : cnt;
721 }
722
723 #ifdef CONFIG_KMOD
724 static void try_to_load(int fb)
725 {
726 request_module("fb%d", fb);
727 }
728 #endif /* CONFIG_KMOD */
729
730 int
731 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
732 {
733 struct fb_fix_screeninfo *fix = &info->fix;
734 int xoffset = var->xoffset;
735 int yoffset = var->yoffset;
736 int err = 0, yres = info->var.yres;
737
738 if (var->yoffset > 0) {
739 if (var->vmode & FB_VMODE_YWRAP) {
740 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
741 err = -EINVAL;
742 else
743 yres = 0;
744 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
745 err = -EINVAL;
746 }
747
748 if (var->xoffset > 0 && (!fix->xpanstep ||
749 (var->xoffset % fix->xpanstep)))
750 err = -EINVAL;
751
752 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
753 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
754 var->xoffset + info->var.xres > info->var.xres_virtual)
755 return -EINVAL;
756
757 if ((err = info->fbops->fb_pan_display(var, info)))
758 return err;
759 info->var.xoffset = var->xoffset;
760 info->var.yoffset = var->yoffset;
761 if (var->vmode & FB_VMODE_YWRAP)
762 info->var.vmode |= FB_VMODE_YWRAP;
763 else
764 info->var.vmode &= ~FB_VMODE_YWRAP;
765 return 0;
766 }
767
768 int
769 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
770 {
771 int err, flags = info->flags;
772
773 if (var->activate & FB_ACTIVATE_INV_MODE) {
774 struct fb_videomode mode1, mode2;
775 int ret = 0;
776
777 fb_var_to_videomode(&mode1, var);
778 fb_var_to_videomode(&mode2, &info->var);
779 /* make sure we don't delete the videomode of current var */
780 ret = fb_mode_is_equal(&mode1, &mode2);
781
782 if (!ret) {
783 struct fb_event event;
784
785 event.info = info;
786 event.data = &mode1;
787 ret = notifier_call_chain(&fb_notifier_list,
788 FB_EVENT_MODE_DELETE, &event);
789 }
790
791 if (!ret)
792 fb_delete_videomode(&mode1, &info->modelist);
793
794 return ret;
795 }
796
797 if ((var->activate & FB_ACTIVATE_FORCE) ||
798 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
799 if (!info->fbops->fb_check_var) {
800 *var = info->var;
801 return 0;
802 }
803
804 if ((err = info->fbops->fb_check_var(var, info)))
805 return err;
806
807 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
808 struct fb_videomode mode;
809 int err = 0;
810
811 info->var = *var;
812 if (info->fbops->fb_set_par)
813 info->fbops->fb_set_par(info);
814
815 fb_pan_display(info, &info->var);
816
817 fb_set_cmap(&info->cmap, info);
818
819 fb_var_to_videomode(&mode, &info->var);
820
821 if (info->modelist.prev && info->modelist.next &&
822 !list_empty(&info->modelist))
823 err = fb_add_videomode(&mode, &info->modelist);
824
825 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
826 struct fb_event event;
827 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
828 FB_EVENT_MODE_CHANGE_ALL :
829 FB_EVENT_MODE_CHANGE;
830
831 info->flags &= ~FBINFO_MISC_USEREVENT;
832 event.info = info;
833 notifier_call_chain(&fb_notifier_list, evnt,
834 &event);
835 }
836 }
837 }
838 return 0;
839 }
840
841 int
842 fb_blank(struct fb_info *info, int blank)
843 {
844 int ret = -EINVAL;
845
846 if (blank > FB_BLANK_POWERDOWN)
847 blank = FB_BLANK_POWERDOWN;
848
849 if (info->fbops->fb_blank)
850 ret = info->fbops->fb_blank(blank, info);
851
852 if (!ret) {
853 struct fb_event event;
854
855 event.info = info;
856 event.data = &blank;
857 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
858 }
859
860 return ret;
861 }
862
863 static int
864 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
865 unsigned long arg)
866 {
867 int fbidx = iminor(inode);
868 struct fb_info *info = registered_fb[fbidx];
869 struct fb_ops *fb = info->fbops;
870 struct fb_var_screeninfo var;
871 struct fb_fix_screeninfo fix;
872 struct fb_con2fbmap con2fb;
873 struct fb_cmap_user cmap;
874 struct fb_event event;
875 void __user *argp = (void __user *)arg;
876 int i;
877
878 if (!fb)
879 return -ENODEV;
880 switch (cmd) {
881 case FBIOGET_VSCREENINFO:
882 return copy_to_user(argp, &info->var,
883 sizeof(var)) ? -EFAULT : 0;
884 case FBIOPUT_VSCREENINFO:
885 if (copy_from_user(&var, argp, sizeof(var)))
886 return -EFAULT;
887 acquire_console_sem();
888 info->flags |= FBINFO_MISC_USEREVENT;
889 i = fb_set_var(info, &var);
890 info->flags &= ~FBINFO_MISC_USEREVENT;
891 release_console_sem();
892 if (i) return i;
893 if (copy_to_user(argp, &var, sizeof(var)))
894 return -EFAULT;
895 return 0;
896 case FBIOGET_FSCREENINFO:
897 return copy_to_user(argp, &info->fix,
898 sizeof(fix)) ? -EFAULT : 0;
899 case FBIOPUTCMAP:
900 if (copy_from_user(&cmap, argp, sizeof(cmap)))
901 return -EFAULT;
902 return (fb_set_user_cmap(&cmap, info));
903 case FBIOGETCMAP:
904 if (copy_from_user(&cmap, argp, sizeof(cmap)))
905 return -EFAULT;
906 return fb_cmap_to_user(&info->cmap, &cmap);
907 case FBIOPAN_DISPLAY:
908 if (copy_from_user(&var, argp, sizeof(var)))
909 return -EFAULT;
910 acquire_console_sem();
911 i = fb_pan_display(info, &var);
912 release_console_sem();
913 if (i)
914 return i;
915 if (copy_to_user(argp, &var, sizeof(var)))
916 return -EFAULT;
917 return 0;
918 case FBIO_CURSOR:
919 return -EINVAL;
920 case FBIOGET_CON2FBMAP:
921 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
922 return -EFAULT;
923 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
924 return -EINVAL;
925 con2fb.framebuffer = -1;
926 event.info = info;
927 event.data = &con2fb;
928 notifier_call_chain(&fb_notifier_list,
929 FB_EVENT_GET_CONSOLE_MAP, &event);
930 return copy_to_user(argp, &con2fb,
931 sizeof(con2fb)) ? -EFAULT : 0;
932 case FBIOPUT_CON2FBMAP:
933 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
934 return - EFAULT;
935 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
936 return -EINVAL;
937 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
938 return -EINVAL;
939 #ifdef CONFIG_KMOD
940 if (!registered_fb[con2fb.framebuffer])
941 try_to_load(con2fb.framebuffer);
942 #endif /* CONFIG_KMOD */
943 if (!registered_fb[con2fb.framebuffer])
944 return -EINVAL;
945 event.info = info;
946 event.data = &con2fb;
947 return notifier_call_chain(&fb_notifier_list,
948 FB_EVENT_SET_CONSOLE_MAP,
949 &event);
950 case FBIOBLANK:
951 acquire_console_sem();
952 info->flags |= FBINFO_MISC_USEREVENT;
953 i = fb_blank(info, arg);
954 info->flags &= ~FBINFO_MISC_USEREVENT;
955 release_console_sem();
956 return i;
957 default:
958 if (fb->fb_ioctl == NULL)
959 return -EINVAL;
960 return fb->fb_ioctl(info, cmd, arg);
961 }
962 }
963
964 #ifdef CONFIG_COMPAT
965 struct fb_fix_screeninfo32 {
966 char id[16];
967 compat_caddr_t smem_start;
968 u32 smem_len;
969 u32 type;
970 u32 type_aux;
971 u32 visual;
972 u16 xpanstep;
973 u16 ypanstep;
974 u16 ywrapstep;
975 u32 line_length;
976 compat_caddr_t mmio_start;
977 u32 mmio_len;
978 u32 accel;
979 u16 reserved[3];
980 };
981
982 struct fb_cmap32 {
983 u32 start;
984 u32 len;
985 compat_caddr_t red;
986 compat_caddr_t green;
987 compat_caddr_t blue;
988 compat_caddr_t transp;
989 };
990
991 static int fb_getput_cmap(struct inode *inode, struct file *file,
992 unsigned int cmd, unsigned long arg)
993 {
994 struct fb_cmap_user __user *cmap;
995 struct fb_cmap32 __user *cmap32;
996 __u32 data;
997 int err;
998
999 cmap = compat_alloc_user_space(sizeof(*cmap));
1000 cmap32 = compat_ptr(arg);
1001
1002 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1003 return -EFAULT;
1004
1005 if (get_user(data, &cmap32->red) ||
1006 put_user(compat_ptr(data), &cmap->red) ||
1007 get_user(data, &cmap32->green) ||
1008 put_user(compat_ptr(data), &cmap->green) ||
1009 get_user(data, &cmap32->blue) ||
1010 put_user(compat_ptr(data), &cmap->blue) ||
1011 get_user(data, &cmap32->transp) ||
1012 put_user(compat_ptr(data), &cmap->transp))
1013 return -EFAULT;
1014
1015 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1016
1017 if (!err) {
1018 if (copy_in_user(&cmap32->start,
1019 &cmap->start,
1020 2 * sizeof(__u32)))
1021 err = -EFAULT;
1022 }
1023 return err;
1024 }
1025
1026 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1027 struct fb_fix_screeninfo32 __user *fix32)
1028 {
1029 __u32 data;
1030 int err;
1031
1032 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1033
1034 data = (__u32) (unsigned long) fix->smem_start;
1035 err |= put_user(data, &fix32->smem_start);
1036
1037 err |= put_user(fix->smem_len, &fix32->smem_len);
1038 err |= put_user(fix->type, &fix32->type);
1039 err |= put_user(fix->type_aux, &fix32->type_aux);
1040 err |= put_user(fix->visual, &fix32->visual);
1041 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1042 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1043 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1044 err |= put_user(fix->line_length, &fix32->line_length);
1045
1046 data = (__u32) (unsigned long) fix->mmio_start;
1047 err |= put_user(data, &fix32->mmio_start);
1048
1049 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1050 err |= put_user(fix->accel, &fix32->accel);
1051 err |= copy_to_user(fix32->reserved, fix->reserved,
1052 sizeof(fix->reserved));
1053
1054 return err;
1055 }
1056
1057 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1058 unsigned int cmd, unsigned long arg)
1059 {
1060 mm_segment_t old_fs;
1061 struct fb_fix_screeninfo fix;
1062 struct fb_fix_screeninfo32 __user *fix32;
1063 int err;
1064
1065 fix32 = compat_ptr(arg);
1066
1067 old_fs = get_fs();
1068 set_fs(KERNEL_DS);
1069 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1070 set_fs(old_fs);
1071
1072 if (!err)
1073 err = do_fscreeninfo_to_user(&fix, fix32);
1074
1075 return err;
1076 }
1077
1078 static long
1079 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1080 {
1081 struct inode *inode = file->f_dentry->d_inode;
1082 int fbidx = iminor(inode);
1083 struct fb_info *info = registered_fb[fbidx];
1084 struct fb_ops *fb = info->fbops;
1085 long ret = -ENOIOCTLCMD;
1086
1087 lock_kernel();
1088 switch(cmd) {
1089 case FBIOGET_VSCREENINFO:
1090 case FBIOPUT_VSCREENINFO:
1091 case FBIOPAN_DISPLAY:
1092 case FBIOGET_CON2FBMAP:
1093 case FBIOPUT_CON2FBMAP:
1094 arg = (unsigned long) compat_ptr(arg);
1095 case FBIOBLANK:
1096 ret = fb_ioctl(inode, file, cmd, arg);
1097 break;
1098
1099 case FBIOGET_FSCREENINFO:
1100 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1101 break;
1102
1103 case FBIOGETCMAP:
1104 case FBIOPUTCMAP:
1105 ret = fb_getput_cmap(inode, file, cmd, arg);
1106 break;
1107
1108 default:
1109 if (fb->fb_compat_ioctl)
1110 ret = fb->fb_compat_ioctl(info, cmd, arg);
1111 break;
1112 }
1113 unlock_kernel();
1114 return ret;
1115 }
1116 #endif
1117
1118 static int
1119 fb_mmap(struct file *file, struct vm_area_struct * vma)
1120 {
1121 int fbidx = iminor(file->f_dentry->d_inode);
1122 struct fb_info *info = registered_fb[fbidx];
1123 struct fb_ops *fb = info->fbops;
1124 unsigned long off;
1125 #if !defined(__sparc__) || defined(__sparc_v9__)
1126 unsigned long start;
1127 u32 len;
1128 #endif
1129
1130 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1131 return -EINVAL;
1132 off = vma->vm_pgoff << PAGE_SHIFT;
1133 if (!fb)
1134 return -ENODEV;
1135 if (fb->fb_mmap) {
1136 int res;
1137 lock_kernel();
1138 res = fb->fb_mmap(info, vma);
1139 unlock_kernel();
1140 return res;
1141 }
1142
1143 #if defined(__sparc__) && !defined(__sparc_v9__)
1144 /* Should never get here, all fb drivers should have their own
1145 mmap routines */
1146 return -EINVAL;
1147 #else
1148 /* !sparc32... */
1149 lock_kernel();
1150
1151 /* frame buffer memory */
1152 start = info->fix.smem_start;
1153 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1154 if (off >= len) {
1155 /* memory mapped io */
1156 off -= len;
1157 if (info->var.accel_flags) {
1158 unlock_kernel();
1159 return -EINVAL;
1160 }
1161 start = info->fix.mmio_start;
1162 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1163 }
1164 unlock_kernel();
1165 start &= PAGE_MASK;
1166 if ((vma->vm_end - vma->vm_start + off) > len)
1167 return -EINVAL;
1168 off += start;
1169 vma->vm_pgoff = off >> PAGE_SHIFT;
1170 /* This is an IO map - tell maydump to skip this VMA */
1171 vma->vm_flags |= VM_IO | VM_RESERVED;
1172 #if defined(__sparc_v9__)
1173 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1174 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1175 return -EAGAIN;
1176 #else
1177 #if defined(__mc68000__)
1178 #if defined(CONFIG_SUN3)
1179 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1180 #elif defined(CONFIG_MMU)
1181 if (CPU_IS_020_OR_030)
1182 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1183 if (CPU_IS_040_OR_060) {
1184 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1185 /* Use no-cache mode, serialized */
1186 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1187 }
1188 #endif
1189 #elif defined(__powerpc__)
1190 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1191 vma->vm_end - vma->vm_start,
1192 vma->vm_page_prot);
1193 #elif defined(__alpha__)
1194 /* Caching is off in the I/O space quadrant by design. */
1195 #elif defined(__i386__) || defined(__x86_64__)
1196 if (boot_cpu_data.x86 > 3)
1197 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1198 #elif defined(__mips__)
1199 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1200 #elif defined(__hppa__)
1201 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1202 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1203 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1204 #elif defined(__ia64__)
1205 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1206 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1207 else
1208 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1209 #else
1210 #warning What do we have to do here??
1211 #endif
1212 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1213 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1214 return -EAGAIN;
1215 #endif /* !__sparc_v9__ */
1216 return 0;
1217 #endif /* !sparc32 */
1218 }
1219
1220 static int
1221 fb_open(struct inode *inode, struct file *file)
1222 {
1223 int fbidx = iminor(inode);
1224 struct fb_info *info;
1225 int res = 0;
1226
1227 if (fbidx >= FB_MAX)
1228 return -ENODEV;
1229 #ifdef CONFIG_KMOD
1230 if (!(info = registered_fb[fbidx]))
1231 try_to_load(fbidx);
1232 #endif /* CONFIG_KMOD */
1233 if (!(info = registered_fb[fbidx]))
1234 return -ENODEV;
1235 if (!try_module_get(info->fbops->owner))
1236 return -ENODEV;
1237 file->private_data = info;
1238 if (info->fbops->fb_open) {
1239 res = info->fbops->fb_open(info,1);
1240 if (res)
1241 module_put(info->fbops->owner);
1242 }
1243 return res;
1244 }
1245
1246 static int
1247 fb_release(struct inode *inode, struct file *file)
1248 {
1249 struct fb_info * const info = file->private_data;
1250
1251 lock_kernel();
1252 if (info->fbops->fb_release)
1253 info->fbops->fb_release(info,1);
1254 module_put(info->fbops->owner);
1255 unlock_kernel();
1256 return 0;
1257 }
1258
1259 static struct file_operations fb_fops = {
1260 .owner = THIS_MODULE,
1261 .read = fb_read,
1262 .write = fb_write,
1263 .ioctl = fb_ioctl,
1264 #ifdef CONFIG_COMPAT
1265 .compat_ioctl = fb_compat_ioctl,
1266 #endif
1267 .mmap = fb_mmap,
1268 .open = fb_open,
1269 .release = fb_release,
1270 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1271 .get_unmapped_area = get_fb_unmapped_area,
1272 #endif
1273 };
1274
1275 static struct class *fb_class;
1276
1277 /**
1278 * register_framebuffer - registers a frame buffer device
1279 * @fb_info: frame buffer info structure
1280 *
1281 * Registers a frame buffer device @fb_info.
1282 *
1283 * Returns negative errno on error, or zero for success.
1284 *
1285 */
1286
1287 int
1288 register_framebuffer(struct fb_info *fb_info)
1289 {
1290 int i;
1291 struct fb_event event;
1292 struct fb_videomode mode;
1293
1294 if (num_registered_fb == FB_MAX)
1295 return -ENXIO;
1296 num_registered_fb++;
1297 for (i = 0 ; i < FB_MAX; i++)
1298 if (!registered_fb[i])
1299 break;
1300 fb_info->node = i;
1301
1302 fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1303 fb_info->device, "fb%d", i);
1304 if (IS_ERR(fb_info->class_device)) {
1305 /* Not fatal */
1306 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1307 fb_info->class_device = NULL;
1308 } else
1309 fb_init_class_device(fb_info);
1310
1311 if (fb_info->pixmap.addr == NULL) {
1312 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1313 if (fb_info->pixmap.addr) {
1314 fb_info->pixmap.size = FBPIXMAPSIZE;
1315 fb_info->pixmap.buf_align = 1;
1316 fb_info->pixmap.scan_align = 1;
1317 fb_info->pixmap.access_align = 32;
1318 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1319 }
1320 }
1321 fb_info->pixmap.offset = 0;
1322
1323 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1324 INIT_LIST_HEAD(&fb_info->modelist);
1325
1326 fb_var_to_videomode(&mode, &fb_info->var);
1327 fb_add_videomode(&mode, &fb_info->modelist);
1328 registered_fb[i] = fb_info;
1329
1330 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1331 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1332 event.info = fb_info;
1333 notifier_call_chain(&fb_notifier_list,
1334 FB_EVENT_FB_REGISTERED, &event);
1335 return 0;
1336 }
1337
1338
1339 /**
1340 * unregister_framebuffer - releases a frame buffer device
1341 * @fb_info: frame buffer info structure
1342 *
1343 * Unregisters a frame buffer device @fb_info.
1344 *
1345 * Returns negative errno on error, or zero for success.
1346 *
1347 */
1348
1349 int
1350 unregister_framebuffer(struct fb_info *fb_info)
1351 {
1352 int i;
1353
1354 i = fb_info->node;
1355 if (!registered_fb[i])
1356 return -EINVAL;
1357 devfs_remove("fb/%d", i);
1358
1359 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1360 kfree(fb_info->pixmap.addr);
1361 fb_destroy_modelist(&fb_info->modelist);
1362 registered_fb[i]=NULL;
1363 num_registered_fb--;
1364 fb_cleanup_class_device(fb_info);
1365 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1366 return 0;
1367 }
1368
1369 /**
1370 * fb_register_client - register a client notifier
1371 * @nb: notifier block to callback on events
1372 */
1373 int fb_register_client(struct notifier_block *nb)
1374 {
1375 return notifier_chain_register(&fb_notifier_list, nb);
1376 }
1377
1378 /**
1379 * fb_unregister_client - unregister a client notifier
1380 * @nb: notifier block to callback on events
1381 */
1382 int fb_unregister_client(struct notifier_block *nb)
1383 {
1384 return notifier_chain_unregister(&fb_notifier_list, nb);
1385 }
1386
1387 /**
1388 * fb_set_suspend - low level driver signals suspend
1389 * @info: framebuffer affected
1390 * @state: 0 = resuming, !=0 = suspending
1391 *
1392 * This is meant to be used by low level drivers to
1393 * signal suspend/resume to the core & clients.
1394 * It must be called with the console semaphore held
1395 */
1396 void fb_set_suspend(struct fb_info *info, int state)
1397 {
1398 struct fb_event event;
1399
1400 event.info = info;
1401 if (state) {
1402 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1403 info->state = FBINFO_STATE_SUSPENDED;
1404 } else {
1405 info->state = FBINFO_STATE_RUNNING;
1406 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1407 }
1408 }
1409
1410 /**
1411 * fbmem_init - init frame buffer subsystem
1412 *
1413 * Initialize the frame buffer subsystem.
1414 *
1415 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1416 *
1417 */
1418
1419 static int __init
1420 fbmem_init(void)
1421 {
1422 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1423
1424 devfs_mk_dir("fb");
1425 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1426 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1427
1428 fb_class = class_create(THIS_MODULE, "graphics");
1429 if (IS_ERR(fb_class)) {
1430 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1431 fb_class = NULL;
1432 }
1433 return 0;
1434 }
1435
1436 #ifdef MODULE
1437 module_init(fbmem_init);
1438 static void __exit
1439 fbmem_exit(void)
1440 {
1441 class_destroy(fb_class);
1442 unregister_chrdev(FB_MAJOR, "fb");
1443 }
1444
1445 module_exit(fbmem_exit);
1446 MODULE_LICENSE("GPL");
1447 MODULE_DESCRIPTION("Framebuffer base");
1448 #else
1449 subsys_initcall(fbmem_init);
1450 #endif
1451
1452 int fb_new_modelist(struct fb_info *info)
1453 {
1454 struct fb_event event;
1455 struct fb_var_screeninfo var = info->var;
1456 struct list_head *pos, *n;
1457 struct fb_modelist *modelist;
1458 struct fb_videomode *m, mode;
1459 int err = 1;
1460
1461 list_for_each_safe(pos, n, &info->modelist) {
1462 modelist = list_entry(pos, struct fb_modelist, list);
1463 m = &modelist->mode;
1464 fb_videomode_to_var(&var, m);
1465 var.activate = FB_ACTIVATE_TEST;
1466 err = fb_set_var(info, &var);
1467 fb_var_to_videomode(&mode, &var);
1468 if (err || !fb_mode_is_equal(m, &mode)) {
1469 list_del(pos);
1470 kfree(pos);
1471 }
1472 }
1473
1474 err = 1;
1475
1476 if (!list_empty(&info->modelist)) {
1477 event.info = info;
1478 err = notifier_call_chain(&fb_notifier_list,
1479 FB_EVENT_NEW_MODELIST,
1480 &event);
1481 }
1482
1483 return err;
1484 }
1485
1486 /**
1487 * fb_con_duit - user<->fbcon passthrough
1488 * @info: struct fb_info
1489 * @event: notification event to be passed to fbcon
1490 * @data: private data
1491 *
1492 * DESCRIPTION
1493 * This function is an fbcon-user event passing channel
1494 * which bypasses fbdev. This is hopefully temporary
1495 * until a user interface for fbcon is created
1496 */
1497 int fb_con_duit(struct fb_info *info, int event, void *data)
1498 {
1499 struct fb_event evnt;
1500
1501 evnt.info = info;
1502 evnt.data = data;
1503
1504 return notifier_call_chain(&fb_notifier_list, event, &evnt);
1505 }
1506 EXPORT_SYMBOL(fb_con_duit);
1507
1508 static char *video_options[FB_MAX];
1509 static int ofonly;
1510
1511 extern const char *global_mode_option;
1512
1513 /**
1514 * fb_get_options - get kernel boot parameters
1515 * @name: framebuffer name as it would appear in
1516 * the boot parameter line
1517 * (video=<name>:<options>)
1518 * @option: the option will be stored here
1519 *
1520 * NOTE: Needed to maintain backwards compatibility
1521 */
1522 int fb_get_options(char *name, char **option)
1523 {
1524 char *opt, *options = NULL;
1525 int opt_len, retval = 0;
1526 int name_len = strlen(name), i;
1527
1528 if (name_len && ofonly && strncmp(name, "offb", 4))
1529 retval = 1;
1530
1531 if (name_len && !retval) {
1532 for (i = 0; i < FB_MAX; i++) {
1533 if (video_options[i] == NULL)
1534 continue;
1535 opt_len = strlen(video_options[i]);
1536 if (!opt_len)
1537 continue;
1538 opt = video_options[i];
1539 if (!strncmp(name, opt, name_len) &&
1540 opt[name_len] == ':')
1541 options = opt + name_len + 1;
1542 }
1543 }
1544 if (options && !strncmp(options, "off", 3))
1545 retval = 1;
1546
1547 if (option)
1548 *option = options;
1549
1550 return retval;
1551 }
1552
1553 #ifndef MODULE
1554 /**
1555 * video_setup - process command line options
1556 * @options: string of options
1557 *
1558 * Process command line options for frame buffer subsystem.
1559 *
1560 * NOTE: This function is a __setup and __init function.
1561 * It only stores the options. Drivers have to call
1562 * fb_get_options() as necessary.
1563 *
1564 * Returns zero.
1565 *
1566 */
1567 static int __init video_setup(char *options)
1568 {
1569 int i, global = 0;
1570
1571 if (!options || !*options)
1572 global = 1;
1573
1574 if (!global && !strncmp(options, "ofonly", 6)) {
1575 ofonly = 1;
1576 global = 1;
1577 }
1578
1579 if (!global && !strstr(options, "fb:")) {
1580 global_mode_option = options;
1581 global = 1;
1582 }
1583
1584 if (!global) {
1585 for (i = 0; i < FB_MAX; i++) {
1586 if (video_options[i] == NULL) {
1587 video_options[i] = options;
1588 break;
1589 }
1590
1591 }
1592 }
1593
1594 return 0;
1595 }
1596 __setup("video=", video_setup);
1597 #endif
1598
1599 /*
1600 * Visible symbols for modules
1601 */
1602
1603 EXPORT_SYMBOL(register_framebuffer);
1604 EXPORT_SYMBOL(unregister_framebuffer);
1605 EXPORT_SYMBOL(num_registered_fb);
1606 EXPORT_SYMBOL(registered_fb);
1607 EXPORT_SYMBOL(fb_prepare_logo);
1608 EXPORT_SYMBOL(fb_show_logo);
1609 EXPORT_SYMBOL(fb_set_var);
1610 EXPORT_SYMBOL(fb_blank);
1611 EXPORT_SYMBOL(fb_pan_display);
1612 EXPORT_SYMBOL(fb_get_buffer_offset);
1613 EXPORT_SYMBOL(fb_set_suspend);
1614 EXPORT_SYMBOL(fb_register_client);
1615 EXPORT_SYMBOL(fb_unregister_client);
1616 EXPORT_SYMBOL(fb_get_options);
1617 EXPORT_SYMBOL(fb_new_modelist);
1618
1619 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree