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DECNET: Handle a failure in neigh_parms_alloc (take 2)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmem.c
blobb1b4d1342f0df7b0361f20fabe5a20e871e18931
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] && clen < 4000;
558 fi++)
559 if (*fi)
560 clen += sprintf(buf + clen, "%d %s\n",
561 (*fi)->node,
562 (*fi)->fix.id);
563 *start = buf + offset;
564 if (clen > offset)
565 clen -= offset;
566 else
567 clen = 0;
568 return clen < len ? clen : len;
569 }
570
571 static ssize_t
572 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
573 {
574 unsigned long p = *ppos;
575 struct inode *inode = file->f_dentry->d_inode;
576 int fbidx = iminor(inode);
577 struct fb_info *info = registered_fb[fbidx];
578 u32 *buffer, *dst;
579 u32 __iomem *src;
580 int c, i, cnt = 0, err = 0;
581 unsigned long total_size;
582
583 if (!info || ! info->screen_base)
584 return -ENODEV;
585
586 if (info->state != FBINFO_STATE_RUNNING)
587 return -EPERM;
588
589 if (info->fbops->fb_read)
590 return info->fbops->fb_read(file, buf, count, ppos);
591
592 total_size = info->screen_size;
593
594 if (total_size == 0)
595 total_size = info->fix.smem_len;
596
597 if (p >= total_size)
598 return 0;
599
600 if (count >= total_size)
601 count = total_size;
602
603 if (count + p > total_size)
604 count = total_size - p;
605
606 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
607 GFP_KERNEL);
608 if (!buffer)
609 return -ENOMEM;
610
611 src = (u32 __iomem *) (info->screen_base + p);
612
613 if (info->fbops->fb_sync)
614 info->fbops->fb_sync(info);
615
616 while (count) {
617 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
618 dst = buffer;
619 for (i = c >> 2; i--; )
620 *dst++ = fb_readl(src++);
621 if (c & 3) {
622 u8 *dst8 = (u8 *) dst;
623 u8 __iomem *src8 = (u8 __iomem *) src;
624
625 for (i = c & 3; i--;)
626 *dst8++ = fb_readb(src8++);
627
628 src = (u32 __iomem *) src8;
629 }
630
631 if (copy_to_user(buf, buffer, c)) {
632 err = -EFAULT;
633 break;
634 }
635 *ppos += c;
636 buf += c;
637 cnt += c;
638 count -= c;
639 }
640
641 kfree(buffer);
642
643 return (err) ? err : cnt;
644 }
645
646 static ssize_t
647 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
648 {
649 unsigned long p = *ppos;
650 struct inode *inode = file->f_dentry->d_inode;
651 int fbidx = iminor(inode);
652 struct fb_info *info = registered_fb[fbidx];
653 u32 *buffer, *src;
654 u32 __iomem *dst;
655 int c, i, cnt = 0, err = 0;
656 unsigned long total_size;
657
658 if (!info || !info->screen_base)
659 return -ENODEV;
660
661 if (info->state != FBINFO_STATE_RUNNING)
662 return -EPERM;
663
664 if (info->fbops->fb_write)
665 return info->fbops->fb_write(file, buf, count, ppos);
666
667 total_size = info->screen_size;
668
669 if (total_size == 0)
670 total_size = info->fix.smem_len;
671
672 if (p > total_size)
673 return -EFBIG;
674
675 if (count > total_size) {
676 err = -EFBIG;
677 count = total_size;
678 }
679
680 if (count + p > total_size) {
681 if (!err)
682 err = -ENOSPC;
683
684 count = total_size - p;
685 }
686
687 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
688 GFP_KERNEL);
689 if (!buffer)
690 return -ENOMEM;
691
692 dst = (u32 __iomem *) (info->screen_base + p);
693
694 if (info->fbops->fb_sync)
695 info->fbops->fb_sync(info);
696
697 while (count) {
698 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
699 src = buffer;
700
701 if (copy_from_user(src, buf, c)) {
702 err = -EFAULT;
703 break;
704 }
705
706 for (i = c >> 2; i--; )
707 fb_writel(*src++, dst++);
708
709 if (c & 3) {
710 u8 *src8 = (u8 *) src;
711 u8 __iomem *dst8 = (u8 __iomem *) dst;
712
713 for (i = c & 3; i--; )
714 fb_writeb(*src8++, dst8++);
715
716 dst = (u32 __iomem *) dst8;
717 }
718
719 *ppos += c;
720 buf += c;
721 cnt += c;
722 count -= c;
723 }
724
725 kfree(buffer);
726
727 return (cnt) ? cnt : err;
728 }
729
730 #ifdef CONFIG_KMOD
731 static void try_to_load(int fb)
732 {
733 request_module("fb%d", fb);
734 }
735 #endif /* CONFIG_KMOD */
736
737 int
738 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
739 {
740 struct fb_fix_screeninfo *fix = &info->fix;
741 int xoffset = var->xoffset;
742 int yoffset = var->yoffset;
743 int err = 0, yres = info->var.yres;
744
745 if (var->yoffset > 0) {
746 if (var->vmode & FB_VMODE_YWRAP) {
747 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
748 err = -EINVAL;
749 else
750 yres = 0;
751 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
752 err = -EINVAL;
753 }
754
755 if (var->xoffset > 0 && (!fix->xpanstep ||
756 (var->xoffset % fix->xpanstep)))
757 err = -EINVAL;
758
759 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
760 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
761 var->xoffset + info->var.xres > info->var.xres_virtual)
762 return -EINVAL;
763
764 if ((err = info->fbops->fb_pan_display(var, info)))
765 return err;
766 info->var.xoffset = var->xoffset;
767 info->var.yoffset = var->yoffset;
768 if (var->vmode & FB_VMODE_YWRAP)
769 info->var.vmode |= FB_VMODE_YWRAP;
770 else
771 info->var.vmode &= ~FB_VMODE_YWRAP;
772 return 0;
773 }
774
775 int
776 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
777 {
778 int err, flags = info->flags;
779
780 if (var->activate & FB_ACTIVATE_INV_MODE) {
781 struct fb_videomode mode1, mode2;
782 int ret = 0;
783
784 fb_var_to_videomode(&mode1, var);
785 fb_var_to_videomode(&mode2, &info->var);
786 /* make sure we don't delete the videomode of current var */
787 ret = fb_mode_is_equal(&mode1, &mode2);
788
789 if (!ret) {
790 struct fb_event event;
791
792 event.info = info;
793 event.data = &mode1;
794 ret = notifier_call_chain(&fb_notifier_list,
795 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 notifier_call_chain(&fb_notifier_list, evnt,
841 &event);
842 }
843 }
844 }
845 return 0;
846 }
847
848 int
849 fb_blank(struct fb_info *info, int blank)
850 {
851 int ret = -EINVAL;
852
853 if (blank > FB_BLANK_POWERDOWN)
854 blank = FB_BLANK_POWERDOWN;
855
856 if (info->fbops->fb_blank)
857 ret = info->fbops->fb_blank(blank, info);
858
859 if (!ret) {
860 struct fb_event event;
861
862 event.info = info;
863 event.data = &blank;
864 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
865 }
866
867 return ret;
868 }
869
870 static int
871 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
872 unsigned long arg)
873 {
874 int fbidx = iminor(inode);
875 struct fb_info *info = registered_fb[fbidx];
876 struct fb_ops *fb = info->fbops;
877 struct fb_var_screeninfo var;
878 struct fb_fix_screeninfo fix;
879 struct fb_con2fbmap con2fb;
880 struct fb_cmap_user cmap;
881 struct fb_event event;
882 void __user *argp = (void __user *)arg;
883 int i;
884
885 if (!fb)
886 return -ENODEV;
887 switch (cmd) {
888 case FBIOGET_VSCREENINFO:
889 return copy_to_user(argp, &info->var,
890 sizeof(var)) ? -EFAULT : 0;
891 case FBIOPUT_VSCREENINFO:
892 if (copy_from_user(&var, argp, sizeof(var)))
893 return -EFAULT;
894 acquire_console_sem();
895 info->flags |= FBINFO_MISC_USEREVENT;
896 i = fb_set_var(info, &var);
897 info->flags &= ~FBINFO_MISC_USEREVENT;
898 release_console_sem();
899 if (i) return i;
900 if (copy_to_user(argp, &var, sizeof(var)))
901 return -EFAULT;
902 return 0;
903 case FBIOGET_FSCREENINFO:
904 return copy_to_user(argp, &info->fix,
905 sizeof(fix)) ? -EFAULT : 0;
906 case FBIOPUTCMAP:
907 if (copy_from_user(&cmap, argp, sizeof(cmap)))
908 return -EFAULT;
909 return (fb_set_user_cmap(&cmap, info));
910 case FBIOGETCMAP:
911 if (copy_from_user(&cmap, argp, sizeof(cmap)))
912 return -EFAULT;
913 return fb_cmap_to_user(&info->cmap, &cmap);
914 case FBIOPAN_DISPLAY:
915 if (copy_from_user(&var, argp, sizeof(var)))
916 return -EFAULT;
917 acquire_console_sem();
918 i = fb_pan_display(info, &var);
919 release_console_sem();
920 if (i)
921 return i;
922 if (copy_to_user(argp, &var, sizeof(var)))
923 return -EFAULT;
924 return 0;
925 case FBIO_CURSOR:
926 return -EINVAL;
927 case FBIOGET_CON2FBMAP:
928 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
929 return -EFAULT;
930 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
931 return -EINVAL;
932 con2fb.framebuffer = -1;
933 event.info = info;
934 event.data = &con2fb;
935 notifier_call_chain(&fb_notifier_list,
936 FB_EVENT_GET_CONSOLE_MAP, &event);
937 return copy_to_user(argp, &con2fb,
938 sizeof(con2fb)) ? -EFAULT : 0;
939 case FBIOPUT_CON2FBMAP:
940 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
941 return - EFAULT;
942 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
943 return -EINVAL;
944 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
945 return -EINVAL;
946 #ifdef CONFIG_KMOD
947 if (!registered_fb[con2fb.framebuffer])
948 try_to_load(con2fb.framebuffer);
949 #endif /* CONFIG_KMOD */
950 if (!registered_fb[con2fb.framebuffer])
951 return -EINVAL;
952 event.info = info;
953 event.data = &con2fb;
954 return notifier_call_chain(&fb_notifier_list,
955 FB_EVENT_SET_CONSOLE_MAP,
956 &event);
957 case FBIOBLANK:
958 acquire_console_sem();
959 info->flags |= FBINFO_MISC_USEREVENT;
960 i = fb_blank(info, arg);
961 info->flags &= ~FBINFO_MISC_USEREVENT;
962 release_console_sem();
963 return i;
964 default:
965 if (fb->fb_ioctl == NULL)
966 return -EINVAL;
967 return fb->fb_ioctl(info, cmd, arg);
968 }
969 }
970
971 #ifdef CONFIG_COMPAT
972 struct fb_fix_screeninfo32 {
973 char id[16];
974 compat_caddr_t smem_start;
975 u32 smem_len;
976 u32 type;
977 u32 type_aux;
978 u32 visual;
979 u16 xpanstep;
980 u16 ypanstep;
981 u16 ywrapstep;
982 u32 line_length;
983 compat_caddr_t mmio_start;
984 u32 mmio_len;
985 u32 accel;
986 u16 reserved[3];
987 };
988
989 struct fb_cmap32 {
990 u32 start;
991 u32 len;
992 compat_caddr_t red;
993 compat_caddr_t green;
994 compat_caddr_t blue;
995 compat_caddr_t transp;
996 };
997
998 static int fb_getput_cmap(struct inode *inode, struct file *file,
999 unsigned int cmd, unsigned long arg)
1000 {
1001 struct fb_cmap_user __user *cmap;
1002 struct fb_cmap32 __user *cmap32;
1003 __u32 data;
1004 int err;
1005
1006 cmap = compat_alloc_user_space(sizeof(*cmap));
1007 cmap32 = compat_ptr(arg);
1008
1009 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1010 return -EFAULT;
1011
1012 if (get_user(data, &cmap32->red) ||
1013 put_user(compat_ptr(data), &cmap->red) ||
1014 get_user(data, &cmap32->green) ||
1015 put_user(compat_ptr(data), &cmap->green) ||
1016 get_user(data, &cmap32->blue) ||
1017 put_user(compat_ptr(data), &cmap->blue) ||
1018 get_user(data, &cmap32->transp) ||
1019 put_user(compat_ptr(data), &cmap->transp))
1020 return -EFAULT;
1021
1022 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1023
1024 if (!err) {
1025 if (copy_in_user(&cmap32->start,
1026 &cmap->start,
1027 2 * sizeof(__u32)))
1028 err = -EFAULT;
1029 }
1030 return err;
1031 }
1032
1033 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1034 struct fb_fix_screeninfo32 __user *fix32)
1035 {
1036 __u32 data;
1037 int err;
1038
1039 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1040
1041 data = (__u32) (unsigned long) fix->smem_start;
1042 err |= put_user(data, &fix32->smem_start);
1043
1044 err |= put_user(fix->smem_len, &fix32->smem_len);
1045 err |= put_user(fix->type, &fix32->type);
1046 err |= put_user(fix->type_aux, &fix32->type_aux);
1047 err |= put_user(fix->visual, &fix32->visual);
1048 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1049 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1050 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1051 err |= put_user(fix->line_length, &fix32->line_length);
1052
1053 data = (__u32) (unsigned long) fix->mmio_start;
1054 err |= put_user(data, &fix32->mmio_start);
1055
1056 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1057 err |= put_user(fix->accel, &fix32->accel);
1058 err |= copy_to_user(fix32->reserved, fix->reserved,
1059 sizeof(fix->reserved));
1060
1061 return err;
1062 }
1063
1064 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1065 unsigned int cmd, unsigned long arg)
1066 {
1067 mm_segment_t old_fs;
1068 struct fb_fix_screeninfo fix;
1069 struct fb_fix_screeninfo32 __user *fix32;
1070 int err;
1071
1072 fix32 = compat_ptr(arg);
1073
1074 old_fs = get_fs();
1075 set_fs(KERNEL_DS);
1076 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1077 set_fs(old_fs);
1078
1079 if (!err)
1080 err = do_fscreeninfo_to_user(&fix, fix32);
1081
1082 return err;
1083 }
1084
1085 static long
1086 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1087 {
1088 struct inode *inode = file->f_dentry->d_inode;
1089 int fbidx = iminor(inode);
1090 struct fb_info *info = registered_fb[fbidx];
1091 struct fb_ops *fb = info->fbops;
1092 long ret = -ENOIOCTLCMD;
1093
1094 lock_kernel();
1095 switch(cmd) {
1096 case FBIOGET_VSCREENINFO:
1097 case FBIOPUT_VSCREENINFO:
1098 case FBIOPAN_DISPLAY:
1099 case FBIOGET_CON2FBMAP:
1100 case FBIOPUT_CON2FBMAP:
1101 arg = (unsigned long) compat_ptr(arg);
1102 case FBIOBLANK:
1103 ret = fb_ioctl(inode, file, cmd, arg);
1104 break;
1105
1106 case FBIOGET_FSCREENINFO:
1107 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1108 break;
1109
1110 case FBIOGETCMAP:
1111 case FBIOPUTCMAP:
1112 ret = fb_getput_cmap(inode, file, cmd, arg);
1113 break;
1114
1115 default:
1116 if (fb->fb_compat_ioctl)
1117 ret = fb->fb_compat_ioctl(info, cmd, arg);
1118 break;
1119 }
1120 unlock_kernel();
1121 return ret;
1122 }
1123 #endif
1124
1125 static int
1126 fb_mmap(struct file *file, struct vm_area_struct * vma)
1127 {
1128 int fbidx = iminor(file->f_dentry->d_inode);
1129 struct fb_info *info = registered_fb[fbidx];
1130 struct fb_ops *fb = info->fbops;
1131 unsigned long off;
1132 #if !defined(__sparc__) || defined(__sparc_v9__)
1133 unsigned long start;
1134 u32 len;
1135 #endif
1136
1137 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1138 return -EINVAL;
1139 off = vma->vm_pgoff << PAGE_SHIFT;
1140 if (!fb)
1141 return -ENODEV;
1142 if (fb->fb_mmap) {
1143 int res;
1144 lock_kernel();
1145 res = fb->fb_mmap(info, vma);
1146 unlock_kernel();
1147 return res;
1148 }
1149
1150 #if defined(__sparc__) && !defined(__sparc_v9__)
1151 /* Should never get here, all fb drivers should have their own
1152 mmap routines */
1153 return -EINVAL;
1154 #else
1155 /* !sparc32... */
1156 lock_kernel();
1157
1158 /* frame buffer memory */
1159 start = info->fix.smem_start;
1160 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1161 if (off >= len) {
1162 /* memory mapped io */
1163 off -= len;
1164 if (info->var.accel_flags) {
1165 unlock_kernel();
1166 return -EINVAL;
1167 }
1168 start = info->fix.mmio_start;
1169 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1170 }
1171 unlock_kernel();
1172 start &= PAGE_MASK;
1173 if ((vma->vm_end - vma->vm_start + off) > len)
1174 return -EINVAL;
1175 off += start;
1176 vma->vm_pgoff = off >> PAGE_SHIFT;
1177 /* This is an IO map - tell maydump to skip this VMA */
1178 vma->vm_flags |= VM_IO | VM_RESERVED;
1179 #if defined(__sparc_v9__)
1180 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1181 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1182 return -EAGAIN;
1183 #else
1184 #if defined(__mc68000__)
1185 #if defined(CONFIG_SUN3)
1186 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1187 #elif defined(CONFIG_MMU)
1188 if (CPU_IS_020_OR_030)
1189 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1190 if (CPU_IS_040_OR_060) {
1191 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1192 /* Use no-cache mode, serialized */
1193 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1194 }
1195 #endif
1196 #elif defined(__powerpc__)
1197 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1198 vma->vm_end - vma->vm_start,
1199 vma->vm_page_prot);
1200 #elif defined(__alpha__)
1201 /* Caching is off in the I/O space quadrant by design. */
1202 #elif defined(__i386__) || defined(__x86_64__)
1203 if (boot_cpu_data.x86 > 3)
1204 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1205 #elif defined(__mips__)
1206 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1207 #elif defined(__hppa__)
1208 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1209 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1210 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1211 #elif defined(__ia64__)
1212 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1213 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1214 else
1215 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1216 #else
1217 #warning What do we have to do here??
1218 #endif
1219 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1220 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1221 return -EAGAIN;
1222 #endif /* !__sparc_v9__ */
1223 return 0;
1224 #endif /* !sparc32 */
1225 }
1226
1227 static int
1228 fb_open(struct inode *inode, struct file *file)
1229 {
1230 int fbidx = iminor(inode);
1231 struct fb_info *info;
1232 int res = 0;
1233
1234 if (fbidx >= FB_MAX)
1235 return -ENODEV;
1236 #ifdef CONFIG_KMOD
1237 if (!(info = registered_fb[fbidx]))
1238 try_to_load(fbidx);
1239 #endif /* CONFIG_KMOD */
1240 if (!(info = registered_fb[fbidx]))
1241 return -ENODEV;
1242 if (!try_module_get(info->fbops->owner))
1243 return -ENODEV;
1244 file->private_data = info;
1245 if (info->fbops->fb_open) {
1246 res = info->fbops->fb_open(info,1);
1247 if (res)
1248 module_put(info->fbops->owner);
1249 }
1250 return res;
1251 }
1252
1253 static int
1254 fb_release(struct inode *inode, struct file *file)
1255 {
1256 struct fb_info * const info = file->private_data;
1257
1258 lock_kernel();
1259 if (info->fbops->fb_release)
1260 info->fbops->fb_release(info,1);
1261 module_put(info->fbops->owner);
1262 unlock_kernel();
1263 return 0;
1264 }
1265
1266 static struct file_operations fb_fops = {
1267 .owner = THIS_MODULE,
1268 .read = fb_read,
1269 .write = fb_write,
1270 .ioctl = fb_ioctl,
1271 #ifdef CONFIG_COMPAT
1272 .compat_ioctl = fb_compat_ioctl,
1273 #endif
1274 .mmap = fb_mmap,
1275 .open = fb_open,
1276 .release = fb_release,
1277 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1278 .get_unmapped_area = get_fb_unmapped_area,
1279 #endif
1280 };
1281
1282 static struct class *fb_class;
1283
1284 /**
1285 * register_framebuffer - registers a frame buffer device
1286 * @fb_info: frame buffer info structure
1287 *
1288 * Registers a frame buffer device @fb_info.
1289 *
1290 * Returns negative errno on error, or zero for success.
1291 *
1292 */
1293
1294 int
1295 register_framebuffer(struct fb_info *fb_info)
1296 {
1297 int i;
1298 struct fb_event event;
1299 struct fb_videomode mode;
1300
1301 if (num_registered_fb == FB_MAX)
1302 return -ENXIO;
1303 num_registered_fb++;
1304 for (i = 0 ; i < FB_MAX; i++)
1305 if (!registered_fb[i])
1306 break;
1307 fb_info->node = i;
1308
1309 fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1310 fb_info->device, "fb%d", i);
1311 if (IS_ERR(fb_info->class_device)) {
1312 /* Not fatal */
1313 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1314 fb_info->class_device = NULL;
1315 } else
1316 fb_init_class_device(fb_info);
1317
1318 if (fb_info->pixmap.addr == NULL) {
1319 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1320 if (fb_info->pixmap.addr) {
1321 fb_info->pixmap.size = FBPIXMAPSIZE;
1322 fb_info->pixmap.buf_align = 1;
1323 fb_info->pixmap.scan_align = 1;
1324 fb_info->pixmap.access_align = 32;
1325 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1326 }
1327 }
1328 fb_info->pixmap.offset = 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 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1338 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1339 event.info = fb_info;
1340 notifier_call_chain(&fb_notifier_list,
1341 FB_EVENT_FB_REGISTERED, &event);
1342 return 0;
1343 }
1344
1345
1346 /**
1347 * unregister_framebuffer - releases a frame buffer device
1348 * @fb_info: frame buffer info structure
1349 *
1350 * Unregisters a frame buffer device @fb_info.
1351 *
1352 * Returns negative errno on error, or zero for success.
1353 *
1354 */
1355
1356 int
1357 unregister_framebuffer(struct fb_info *fb_info)
1358 {
1359 int i;
1360
1361 i = fb_info->node;
1362 if (!registered_fb[i])
1363 return -EINVAL;
1364 devfs_remove("fb/%d", i);
1365
1366 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1367 kfree(fb_info->pixmap.addr);
1368 fb_destroy_modelist(&fb_info->modelist);
1369 registered_fb[i]=NULL;
1370 num_registered_fb--;
1371 fb_cleanup_class_device(fb_info);
1372 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1373 return 0;
1374 }
1375
1376 /**
1377 * fb_register_client - register a client notifier
1378 * @nb: notifier block to callback on events
1379 */
1380 int fb_register_client(struct notifier_block *nb)
1381 {
1382 return notifier_chain_register(&fb_notifier_list, nb);
1383 }
1384
1385 /**
1386 * fb_unregister_client - unregister a client notifier
1387 * @nb: notifier block to callback on events
1388 */
1389 int fb_unregister_client(struct notifier_block *nb)
1390 {
1391 return notifier_chain_unregister(&fb_notifier_list, nb);
1392 }
1393
1394 /**
1395 * fb_set_suspend - low level driver signals suspend
1396 * @info: framebuffer affected
1397 * @state: 0 = resuming, !=0 = suspending
1398 *
1399 * This is meant to be used by low level drivers to
1400 * signal suspend/resume to the core & clients.
1401 * It must be called with the console semaphore held
1402 */
1403 void fb_set_suspend(struct fb_info *info, int state)
1404 {
1405 struct fb_event event;
1406
1407 event.info = info;
1408 if (state) {
1409 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1410 info->state = FBINFO_STATE_SUSPENDED;
1411 } else {
1412 info->state = FBINFO_STATE_RUNNING;
1413 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1414 }
1415 }
1416
1417 /**
1418 * fbmem_init - init frame buffer subsystem
1419 *
1420 * Initialize the frame buffer subsystem.
1421 *
1422 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1423 *
1424 */
1425
1426 static int __init
1427 fbmem_init(void)
1428 {
1429 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1430
1431 devfs_mk_dir("fb");
1432 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1433 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1434
1435 fb_class = class_create(THIS_MODULE, "graphics");
1436 if (IS_ERR(fb_class)) {
1437 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1438 fb_class = NULL;
1439 }
1440 return 0;
1441 }
1442
1443 #ifdef MODULE
1444 module_init(fbmem_init);
1445 static void __exit
1446 fbmem_exit(void)
1447 {
1448 class_destroy(fb_class);
1449 unregister_chrdev(FB_MAJOR, "fb");
1450 }
1451
1452 module_exit(fbmem_exit);
1453 MODULE_LICENSE("GPL");
1454 MODULE_DESCRIPTION("Framebuffer base");
1455 #else
1456 subsys_initcall(fbmem_init);
1457 #endif
1458
1459 int fb_new_modelist(struct fb_info *info)
1460 {
1461 struct fb_event event;
1462 struct fb_var_screeninfo var = info->var;
1463 struct list_head *pos, *n;
1464 struct fb_modelist *modelist;
1465 struct fb_videomode *m, mode;
1466 int err = 1;
1467
1468 list_for_each_safe(pos, n, &info->modelist) {
1469 modelist = list_entry(pos, struct fb_modelist, list);
1470 m = &modelist->mode;
1471 fb_videomode_to_var(&var, m);
1472 var.activate = FB_ACTIVATE_TEST;
1473 err = fb_set_var(info, &var);
1474 fb_var_to_videomode(&mode, &var);
1475 if (err || !fb_mode_is_equal(m, &mode)) {
1476 list_del(pos);
1477 kfree(pos);
1478 }
1479 }
1480
1481 err = 1;
1482
1483 if (!list_empty(&info->modelist)) {
1484 event.info = info;
1485 err = notifier_call_chain(&fb_notifier_list,
1486 FB_EVENT_NEW_MODELIST,
1487 &event);
1488 }
1489
1490 return err;
1491 }
1492
1493 /**
1494 * fb_con_duit - user<->fbcon passthrough
1495 * @info: struct fb_info
1496 * @event: notification event to be passed to fbcon
1497 * @data: private data
1498 *
1499 * DESCRIPTION
1500 * This function is an fbcon-user event passing channel
1501 * which bypasses fbdev. This is hopefully temporary
1502 * until a user interface for fbcon is created
1503 */
1504 int fb_con_duit(struct fb_info *info, int event, void *data)
1505 {
1506 struct fb_event evnt;
1507
1508 evnt.info = info;
1509 evnt.data = data;
1510
1511 return notifier_call_chain(&fb_notifier_list, event, &evnt);
1512 }
1513 EXPORT_SYMBOL(fb_con_duit);
1514
1515 static char *video_options[FB_MAX];
1516 static int ofonly;
1517
1518 extern const char *global_mode_option;
1519
1520 /**
1521 * fb_get_options - get kernel boot parameters
1522 * @name: framebuffer name as it would appear in
1523 * the boot parameter line
1524 * (video=<name>:<options>)
1525 * @option: the option will be stored here
1526 *
1527 * NOTE: Needed to maintain backwards compatibility
1528 */
1529 int fb_get_options(char *name, char **option)
1530 {
1531 char *opt, *options = NULL;
1532 int opt_len, retval = 0;
1533 int name_len = strlen(name), i;
1534
1535 if (name_len && ofonly && strncmp(name, "offb", 4))
1536 retval = 1;
1537
1538 if (name_len && !retval) {
1539 for (i = 0; i < FB_MAX; i++) {
1540 if (video_options[i] == NULL)
1541 continue;
1542 opt_len = strlen(video_options[i]);
1543 if (!opt_len)
1544 continue;
1545 opt = video_options[i];
1546 if (!strncmp(name, opt, name_len) &&
1547 opt[name_len] == ':')
1548 options = opt + name_len + 1;
1549 }
1550 }
1551 if (options && !strncmp(options, "off", 3))
1552 retval = 1;
1553
1554 if (option)
1555 *option = options;
1556
1557 return retval;
1558 }
1559
1560 #ifndef MODULE
1561 /**
1562 * video_setup - process command line options
1563 * @options: string of options
1564 *
1565 * Process command line options for frame buffer subsystem.
1566 *
1567 * NOTE: This function is a __setup and __init function.
1568 * It only stores the options. Drivers have to call
1569 * fb_get_options() as necessary.
1570 *
1571 * Returns zero.
1572 *
1573 */
1574 static int __init video_setup(char *options)
1575 {
1576 int i, global = 0;
1577
1578 if (!options || !*options)
1579 global = 1;
1580
1581 if (!global && !strncmp(options, "ofonly", 6)) {
1582 ofonly = 1;
1583 global = 1;
1584 }
1585
1586 if (!global && !strstr(options, "fb:")) {
1587 global_mode_option = options;
1588 global = 1;
1589 }
1590
1591 if (!global) {
1592 for (i = 0; i < FB_MAX; i++) {
1593 if (video_options[i] == NULL) {
1594 video_options[i] = options;
1595 break;
1596 }
1597
1598 }
1599 }
1600
1601 return 0;
1602 }
1603 __setup("video=", video_setup);
1604 #endif
1605
1606 /*
1607 * Visible symbols for modules
1608 */
1609
1610 EXPORT_SYMBOL(register_framebuffer);
1611 EXPORT_SYMBOL(unregister_framebuffer);
1612 EXPORT_SYMBOL(num_registered_fb);
1613 EXPORT_SYMBOL(registered_fb);
1614 EXPORT_SYMBOL(fb_prepare_logo);
1615 EXPORT_SYMBOL(fb_show_logo);
1616 EXPORT_SYMBOL(fb_set_var);
1617 EXPORT_SYMBOL(fb_blank);
1618 EXPORT_SYMBOL(fb_pan_display);
1619 EXPORT_SYMBOL(fb_get_buffer_offset);
1620 EXPORT_SYMBOL(fb_set_suspend);
1621 EXPORT_SYMBOL(fb_register_client);
1622 EXPORT_SYMBOL(fb_unregister_client);
1623 EXPORT_SYMBOL(fb_get_options);
1624 EXPORT_SYMBOL(fb_new_modelist);
1625
1626 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree