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hwmon: applesmc: prolong status wait
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmem.c
blob217c5118ae9e71818ea80014cb2b54cb8c63c707
1 /*
2 * linux/drivers/video/fbmem.c
3 *
4 * Copyright (C) 1994 Martin Schaller
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive
11 * for more details.
12 */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/smp_lock.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/mman.h>
25 #include <linux/vt.h>
26 #include <linux/init.h>
27 #include <linux/linux_logo.h>
28 #include <linux/proc_fs.h>
29 #include <linux/seq_file.h>
30 #include <linux/console.h>
31 #include <linux/kmod.h>
32 #include <linux/err.h>
33 #include <linux/device.h>
34 #include <linux/efi.h>
35 #include <linux/fb.h>
36
37 #include <asm/fb.h>
38
39
40 /*
41 * Frame buffer device initialization and setup routines
42 */
43
44 #define FBPIXMAPSIZE (1024 * 8)
45
46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
47 int num_registered_fb __read_mostly;
48
49 /*
50 * Helpers
51 */
52
53 int fb_get_color_depth(struct fb_var_screeninfo *var,
54 struct fb_fix_screeninfo *fix)
55 {
56 int depth = 0;
57
58 if (fix->visual == FB_VISUAL_MONO01 ||
59 fix->visual == FB_VISUAL_MONO10)
60 depth = 1;
61 else {
62 if (var->green.length == var->blue.length &&
63 var->green.length == var->red.length &&
64 var->green.offset == var->blue.offset &&
65 var->green.offset == var->red.offset)
66 depth = var->green.length;
67 else
68 depth = var->green.length + var->red.length +
69 var->blue.length;
70 }
71
72 return depth;
73 }
74 EXPORT_SYMBOL(fb_get_color_depth);
75
76 /*
77 * Data padding functions.
78 */
79 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
80 {
81 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
82 }
83 EXPORT_SYMBOL(fb_pad_aligned_buffer);
84
85 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
86 u32 shift_high, u32 shift_low, u32 mod)
87 {
88 u8 mask = (u8) (0xfff << shift_high), tmp;
89 int i, j;
90
91 for (i = height; i--; ) {
92 for (j = 0; j < idx; j++) {
93 tmp = dst[j];
94 tmp &= mask;
95 tmp |= *src >> shift_low;
96 dst[j] = tmp;
97 tmp = *src << shift_high;
98 dst[j+1] = tmp;
99 src++;
100 }
101 tmp = dst[idx];
102 tmp &= mask;
103 tmp |= *src >> shift_low;
104 dst[idx] = tmp;
105 if (shift_high < mod) {
106 tmp = *src << shift_high;
107 dst[idx+1] = tmp;
108 }
109 src++;
110 dst += d_pitch;
111 }
112 }
113 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
114
115 /*
116 * we need to lock this section since fb_cursor
117 * may use fb_imageblit()
118 */
119 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
120 {
121 u32 align = buf->buf_align - 1, offset;
122 char *addr = buf->addr;
123
124 /* If IO mapped, we need to sync before access, no sharing of
125 * the pixmap is done
126 */
127 if (buf->flags & FB_PIXMAP_IO) {
128 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
129 info->fbops->fb_sync(info);
130 return addr;
131 }
132
133 /* See if we fit in the remaining pixmap space */
134 offset = buf->offset + align;
135 offset &= ~align;
136 if (offset + size > buf->size) {
137 /* We do not fit. In order to be able to re-use the buffer,
138 * we must ensure no asynchronous DMA'ing or whatever operation
139 * is in progress, we sync for that.
140 */
141 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142 info->fbops->fb_sync(info);
143 offset = 0;
144 }
145 buf->offset = offset + size;
146 addr += offset;
147
148 return addr;
149 }
150
151 #ifdef CONFIG_LOGO
152
153 static inline unsigned safe_shift(unsigned d, int n)
154 {
155 return n < 0 ? d >> -n : d << n;
156 }
157
158 static void fb_set_logocmap(struct fb_info *info,
159 const struct linux_logo *logo)
160 {
161 struct fb_cmap palette_cmap;
162 u16 palette_green[16];
163 u16 palette_blue[16];
164 u16 palette_red[16];
165 int i, j, n;
166 const unsigned char *clut = logo->clut;
167
168 palette_cmap.start = 0;
169 palette_cmap.len = 16;
170 palette_cmap.red = palette_red;
171 palette_cmap.green = palette_green;
172 palette_cmap.blue = palette_blue;
173 palette_cmap.transp = NULL;
174
175 for (i = 0; i < logo->clutsize; i += n) {
176 n = logo->clutsize - i;
177 /* palette_cmap provides space for only 16 colors at once */
178 if (n > 16)
179 n = 16;
180 palette_cmap.start = 32 + i;
181 palette_cmap.len = n;
182 for (j = 0; j < n; ++j) {
183 palette_cmap.red[j] = clut[0] << 8 | clut[0];
184 palette_cmap.green[j] = clut[1] << 8 | clut[1];
185 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
186 clut += 3;
187 }
188 fb_set_cmap(&palette_cmap, info);
189 }
190 }
191
192 static void fb_set_logo_truepalette(struct fb_info *info,
193 const struct linux_logo *logo,
194 u32 *palette)
195 {
196 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
197 unsigned char redmask, greenmask, bluemask;
198 int redshift, greenshift, blueshift;
199 int i;
200 const unsigned char *clut = logo->clut;
201
202 /*
203 * We have to create a temporary palette since console palette is only
204 * 16 colors long.
205 */
206 /* Bug: Doesn't obey msb_right ... (who needs that?) */
207 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
208 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
209 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
210 redshift = info->var.red.offset - (8 - info->var.red.length);
211 greenshift = info->var.green.offset - (8 - info->var.green.length);
212 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
213
214 for ( i = 0; i < logo->clutsize; i++) {
215 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
216 safe_shift((clut[1] & greenmask), greenshift) |
217 safe_shift((clut[2] & bluemask), blueshift));
218 clut += 3;
219 }
220 }
221
222 static void fb_set_logo_directpalette(struct fb_info *info,
223 const struct linux_logo *logo,
224 u32 *palette)
225 {
226 int redshift, greenshift, blueshift;
227 int i;
228
229 redshift = info->var.red.offset;
230 greenshift = info->var.green.offset;
231 blueshift = info->var.blue.offset;
232
233 for (i = 32; i < logo->clutsize; i++)
234 palette[i] = i << redshift | i << greenshift | i << blueshift;
235 }
236
237 static void fb_set_logo(struct fb_info *info,
238 const struct linux_logo *logo, u8 *dst,
239 int depth)
240 {
241 int i, j, k;
242 const u8 *src = logo->data;
243 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
244 u8 fg = 1, d;
245
246 switch (fb_get_color_depth(&info->var, &info->fix)) {
247 case 1:
248 fg = 1;
249 break;
250 case 2:
251 fg = 3;
252 break;
253 default:
254 fg = 7;
255 break;
256 }
257
258 if (info->fix.visual == FB_VISUAL_MONO01 ||
259 info->fix.visual == FB_VISUAL_MONO10)
260 fg = ~((u8) (0xfff << info->var.green.length));
261
262 switch (depth) {
263 case 4:
264 for (i = 0; i < logo->height; i++)
265 for (j = 0; j < logo->width; src++) {
266 *dst++ = *src >> 4;
267 j++;
268 if (j < logo->width) {
269 *dst++ = *src & 0x0f;
270 j++;
271 }
272 }
273 break;
274 case 1:
275 for (i = 0; i < logo->height; i++) {
276 for (j = 0; j < logo->width; src++) {
277 d = *src ^ xor;
278 for (k = 7; k >= 0; k--) {
279 *dst++ = ((d >> k) & 1) ? fg : 0;
280 j++;
281 }
282 }
283 }
284 break;
285 }
286 }
287
288 /*
289 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
290 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
291 * the visual format and color depth of the framebuffer, the DAC, the
292 * pseudo_palette, and the logo data will be adjusted accordingly.
293 *
294 * Case 1 - linux_logo_clut224:
295 * Color exceeds the number of console colors (16), thus we set the hardware DAC
296 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
297 *
298 * For visuals that require color info from the pseudo_palette, we also construct
299 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
300 * will be set.
301 *
302 * Case 2 - linux_logo_vga16:
303 * The number of colors just matches the console colors, thus there is no need
304 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
305 * each byte contains color information for two pixels (upper and lower nibble).
306 * To be consistent with fb_imageblit() usage, we therefore separate the two
307 * nibbles into separate bytes. The "depth" flag will be set to 4.
308 *
309 * Case 3 - linux_logo_mono:
310 * This is similar with Case 2. Each byte contains information for 8 pixels.
311 * We isolate each bit and expand each into a byte. The "depth" flag will
312 * be set to 1.
313 */
314 static struct logo_data {
315 int depth;
316 int needs_directpalette;
317 int needs_truepalette;
318 int needs_cmapreset;
319 const struct linux_logo *logo;
320 } fb_logo __read_mostly;
321
322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
323 {
324 u32 size = width * height, i;
325
326 out += size - 1;
327
328 for (i = size; i--; )
329 *out-- = *in++;
330 }
331
332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334 int i, j, h = height - 1;
335
336 for (i = 0; i < height; i++)
337 for (j = 0; j < width; j++)
338 out[height * j + h - i] = *in++;
339 }
340
341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
342 {
343 int i, j, w = width - 1;
344
345 for (i = 0; i < height; i++)
346 for (j = 0; j < width; j++)
347 out[height * (w - j) + i] = *in++;
348 }
349
350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
351 struct fb_image *image, int rotate)
352 {
353 u32 tmp;
354
355 if (rotate == FB_ROTATE_UD) {
356 fb_rotate_logo_ud(image->data, dst, image->width,
357 image->height);
358 image->dx = info->var.xres - image->width - image->dx;
359 image->dy = info->var.yres - image->height - image->dy;
360 } else if (rotate == FB_ROTATE_CW) {
361 fb_rotate_logo_cw(image->data, dst, image->width,
362 image->height);
363 tmp = image->width;
364 image->width = image->height;
365 image->height = tmp;
366 tmp = image->dy;
367 image->dy = image->dx;
368 image->dx = info->var.xres - image->width - tmp;
369 } else if (rotate == FB_ROTATE_CCW) {
370 fb_rotate_logo_ccw(image->data, dst, image->width,
371 image->height);
372 tmp = image->width;
373 image->width = image->height;
374 image->height = tmp;
375 tmp = image->dx;
376 image->dx = image->dy;
377 image->dy = info->var.yres - image->height - tmp;
378 }
379
380 image->data = dst;
381 }
382
383 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
384 int rotate, unsigned int num)
385 {
386 unsigned int x;
387
388 if (rotate == FB_ROTATE_UR) {
389 for (x = 0;
390 x < num && image->dx + image->width <= info->var.xres;
391 x++) {
392 info->fbops->fb_imageblit(info, image);
393 image->dx += image->width + 8;
394 }
395 } else if (rotate == FB_ROTATE_UD) {
396 for (x = 0; x < num && image->dx >= 0; x++) {
397 info->fbops->fb_imageblit(info, image);
398 image->dx -= image->width + 8;
399 }
400 } else if (rotate == FB_ROTATE_CW) {
401 for (x = 0;
402 x < num && image->dy + image->height <= info->var.yres;
403 x++) {
404 info->fbops->fb_imageblit(info, image);
405 image->dy += image->height + 8;
406 }
407 } else if (rotate == FB_ROTATE_CCW) {
408 for (x = 0; x < num && image->dy >= 0; x++) {
409 info->fbops->fb_imageblit(info, image);
410 image->dy -= image->height + 8;
411 }
412 }
413 }
414
415 static int fb_show_logo_line(struct fb_info *info, int rotate,
416 const struct linux_logo *logo, int y,
417 unsigned int n)
418 {
419 u32 *palette = NULL, *saved_pseudo_palette = NULL;
420 unsigned char *logo_new = NULL, *logo_rotate = NULL;
421 struct fb_image image;
422
423 /* Return if the frame buffer is not mapped or suspended */
424 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
425 info->flags & FBINFO_MODULE)
426 return 0;
427
428 image.depth = 8;
429 image.data = logo->data;
430
431 if (fb_logo.needs_cmapreset)
432 fb_set_logocmap(info, logo);
433
434 if (fb_logo.needs_truepalette ||
435 fb_logo.needs_directpalette) {
436 palette = kmalloc(256 * 4, GFP_KERNEL);
437 if (palette == NULL)
438 return 0;
439
440 if (fb_logo.needs_truepalette)
441 fb_set_logo_truepalette(info, logo, palette);
442 else
443 fb_set_logo_directpalette(info, logo, palette);
444
445 saved_pseudo_palette = info->pseudo_palette;
446 info->pseudo_palette = palette;
447 }
448
449 if (fb_logo.depth <= 4) {
450 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
451 if (logo_new == NULL) {
452 kfree(palette);
453 if (saved_pseudo_palette)
454 info->pseudo_palette = saved_pseudo_palette;
455 return 0;
456 }
457 image.data = logo_new;
458 fb_set_logo(info, logo, logo_new, fb_logo.depth);
459 }
460
461 image.dx = 0;
462 image.dy = y;
463 image.width = logo->width;
464 image.height = logo->height;
465
466 if (rotate) {
467 logo_rotate = kmalloc(logo->width *
468 logo->height, GFP_KERNEL);
469 if (logo_rotate)
470 fb_rotate_logo(info, logo_rotate, &image, rotate);
471 }
472
473 fb_do_show_logo(info, &image, rotate, n);
474
475 kfree(palette);
476 if (saved_pseudo_palette != NULL)
477 info->pseudo_palette = saved_pseudo_palette;
478 kfree(logo_new);
479 kfree(logo_rotate);
480 return logo->height;
481 }
482
483
484 #ifdef CONFIG_FB_LOGO_EXTRA
485
486 #define FB_LOGO_EX_NUM_MAX 10
487 static struct logo_data_extra {
488 const struct linux_logo *logo;
489 unsigned int n;
490 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
491 static unsigned int fb_logo_ex_num;
492
493 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
494 {
495 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
496 return;
497
498 fb_logo_ex[fb_logo_ex_num].logo = logo;
499 fb_logo_ex[fb_logo_ex_num].n = n;
500 fb_logo_ex_num++;
501 }
502
503 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
504 unsigned int yres)
505 {
506 unsigned int i;
507
508 /* FIXME: logo_ex supports only truecolor fb. */
509 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
510 fb_logo_ex_num = 0;
511
512 for (i = 0; i < fb_logo_ex_num; i++) {
513 height += fb_logo_ex[i].logo->height;
514 if (height > yres) {
515 height -= fb_logo_ex[i].logo->height;
516 fb_logo_ex_num = i;
517 break;
518 }
519 }
520 return height;
521 }
522
523 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
524 {
525 unsigned int i;
526
527 for (i = 0; i < fb_logo_ex_num; i++)
528 y += fb_show_logo_line(info, rotate,
529 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
530
531 return y;
532 }
533
534 #else /* !CONFIG_FB_LOGO_EXTRA */
535
536 static inline int fb_prepare_extra_logos(struct fb_info *info,
537 unsigned int height,
538 unsigned int yres)
539 {
540 return height;
541 }
542
543 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
544 {
545 return y;
546 }
547
548 #endif /* CONFIG_FB_LOGO_EXTRA */
549
550
551 int fb_prepare_logo(struct fb_info *info, int rotate)
552 {
553 int depth = fb_get_color_depth(&info->var, &info->fix);
554 unsigned int yres;
555
556 memset(&fb_logo, 0, sizeof(struct logo_data));
557
558 if (info->flags & FBINFO_MISC_TILEBLITTING ||
559 info->flags & FBINFO_MODULE)
560 return 0;
561
562 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
563 depth = info->var.blue.length;
564 if (info->var.red.length < depth)
565 depth = info->var.red.length;
566 if (info->var.green.length < depth)
567 depth = info->var.green.length;
568 }
569
570 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
571 /* assume console colormap */
572 depth = 4;
573 }
574
575 /* Return if no suitable logo was found */
576 fb_logo.logo = fb_find_logo(depth);
577
578 if (!fb_logo.logo) {
579 return 0;
580 }
581
582 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
583 yres = info->var.yres;
584 else
585 yres = info->var.xres;
586
587 if (fb_logo.logo->height > yres) {
588 fb_logo.logo = NULL;
589 return 0;
590 }
591
592 /* What depth we asked for might be different from what we get */
593 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
594 fb_logo.depth = 8;
595 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
596 fb_logo.depth = 4;
597 else
598 fb_logo.depth = 1;
599
600
601 if (fb_logo.depth > 4 && depth > 4) {
602 switch (info->fix.visual) {
603 case FB_VISUAL_TRUECOLOR:
604 fb_logo.needs_truepalette = 1;
605 break;
606 case FB_VISUAL_DIRECTCOLOR:
607 fb_logo.needs_directpalette = 1;
608 fb_logo.needs_cmapreset = 1;
609 break;
610 case FB_VISUAL_PSEUDOCOLOR:
611 fb_logo.needs_cmapreset = 1;
612 break;
613 }
614 }
615
616 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
617 }
618
619 int fb_show_logo(struct fb_info *info, int rotate)
620 {
621 int y;
622
623 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
624 num_online_cpus());
625 y = fb_show_extra_logos(info, y, rotate);
626
627 return y;
628 }
629 #else
630 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
631 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
632 #endif /* CONFIG_LOGO */
633
634 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
635 {
636 return (*pos < FB_MAX) ? pos : NULL;
637 }
638
639 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
640 {
641 (*pos)++;
642 return (*pos < FB_MAX) ? pos : NULL;
643 }
644
645 static void fb_seq_stop(struct seq_file *m, void *v)
646 {
647 }
648
649 static int fb_seq_show(struct seq_file *m, void *v)
650 {
651 int i = *(loff_t *)v;
652 struct fb_info *fi = registered_fb[i];
653
654 if (fi)
655 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
656 return 0;
657 }
658
659 static const struct seq_operations proc_fb_seq_ops = {
660 .start = fb_seq_start,
661 .next = fb_seq_next,
662 .stop = fb_seq_stop,
663 .show = fb_seq_show,
664 };
665
666 static int proc_fb_open(struct inode *inode, struct file *file)
667 {
668 return seq_open(file, &proc_fb_seq_ops);
669 }
670
671 static const struct file_operations fb_proc_fops = {
672 .owner = THIS_MODULE,
673 .open = proc_fb_open,
674 .read = seq_read,
675 .llseek = seq_lseek,
676 .release = seq_release,
677 };
678
679 static ssize_t
680 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
681 {
682 unsigned long p = *ppos;
683 struct inode *inode = file->f_path.dentry->d_inode;
684 int fbidx = iminor(inode);
685 struct fb_info *info = registered_fb[fbidx];
686 u32 *buffer, *dst;
687 u32 __iomem *src;
688 int c, i, cnt = 0, err = 0;
689 unsigned long total_size;
690
691 if (!info || ! info->screen_base)
692 return -ENODEV;
693
694 if (info->state != FBINFO_STATE_RUNNING)
695 return -EPERM;
696
697 if (info->fbops->fb_read)
698 return info->fbops->fb_read(info, buf, count, ppos);
699
700 total_size = info->screen_size;
701
702 if (total_size == 0)
703 total_size = info->fix.smem_len;
704
705 if (p >= total_size)
706 return 0;
707
708 if (count >= total_size)
709 count = total_size;
710
711 if (count + p > total_size)
712 count = total_size - p;
713
714 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
715 GFP_KERNEL);
716 if (!buffer)
717 return -ENOMEM;
718
719 src = (u32 __iomem *) (info->screen_base + p);
720
721 if (info->fbops->fb_sync)
722 info->fbops->fb_sync(info);
723
724 while (count) {
725 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
726 dst = buffer;
727 for (i = c >> 2; i--; )
728 *dst++ = fb_readl(src++);
729 if (c & 3) {
730 u8 *dst8 = (u8 *) dst;
731 u8 __iomem *src8 = (u8 __iomem *) src;
732
733 for (i = c & 3; i--;)
734 *dst8++ = fb_readb(src8++);
735
736 src = (u32 __iomem *) src8;
737 }
738
739 if (copy_to_user(buf, buffer, c)) {
740 err = -EFAULT;
741 break;
742 }
743 *ppos += c;
744 buf += c;
745 cnt += c;
746 count -= c;
747 }
748
749 kfree(buffer);
750
751 return (err) ? err : cnt;
752 }
753
754 static ssize_t
755 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
756 {
757 unsigned long p = *ppos;
758 struct inode *inode = file->f_path.dentry->d_inode;
759 int fbidx = iminor(inode);
760 struct fb_info *info = registered_fb[fbidx];
761 u32 *buffer, *src;
762 u32 __iomem *dst;
763 int c, i, cnt = 0, err = 0;
764 unsigned long total_size;
765
766 if (!info || !info->screen_base)
767 return -ENODEV;
768
769 if (info->state != FBINFO_STATE_RUNNING)
770 return -EPERM;
771
772 if (info->fbops->fb_write)
773 return info->fbops->fb_write(info, buf, count, ppos);
774
775 total_size = info->screen_size;
776
777 if (total_size == 0)
778 total_size = info->fix.smem_len;
779
780 if (p > total_size)
781 return -EFBIG;
782
783 if (count > total_size) {
784 err = -EFBIG;
785 count = total_size;
786 }
787
788 if (count + p > total_size) {
789 if (!err)
790 err = -ENOSPC;
791
792 count = total_size - p;
793 }
794
795 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
796 GFP_KERNEL);
797 if (!buffer)
798 return -ENOMEM;
799
800 dst = (u32 __iomem *) (info->screen_base + p);
801
802 if (info->fbops->fb_sync)
803 info->fbops->fb_sync(info);
804
805 while (count) {
806 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
807 src = buffer;
808
809 if (copy_from_user(src, buf, c)) {
810 err = -EFAULT;
811 break;
812 }
813
814 for (i = c >> 2; i--; )
815 fb_writel(*src++, dst++);
816
817 if (c & 3) {
818 u8 *src8 = (u8 *) src;
819 u8 __iomem *dst8 = (u8 __iomem *) dst;
820
821 for (i = c & 3; i--; )
822 fb_writeb(*src8++, dst8++);
823
824 dst = (u32 __iomem *) dst8;
825 }
826
827 *ppos += c;
828 buf += c;
829 cnt += c;
830 count -= c;
831 }
832
833 kfree(buffer);
834
835 return (cnt) ? cnt : err;
836 }
837
838 int
839 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
840 {
841 struct fb_fix_screeninfo *fix = &info->fix;
842 unsigned int yres = info->var.yres;
843 int err = 0;
844
845 if (var->yoffset > 0) {
846 if (var->vmode & FB_VMODE_YWRAP) {
847 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
848 err = -EINVAL;
849 else
850 yres = 0;
851 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
852 err = -EINVAL;
853 }
854
855 if (var->xoffset > 0 && (!fix->xpanstep ||
856 (var->xoffset % fix->xpanstep)))
857 err = -EINVAL;
858
859 if (err || !info->fbops->fb_pan_display ||
860 var->yoffset + yres > info->var.yres_virtual ||
861 var->xoffset + info->var.xres > info->var.xres_virtual)
862 return -EINVAL;
863
864 if ((err = info->fbops->fb_pan_display(var, info)))
865 return err;
866 info->var.xoffset = var->xoffset;
867 info->var.yoffset = var->yoffset;
868 if (var->vmode & FB_VMODE_YWRAP)
869 info->var.vmode |= FB_VMODE_YWRAP;
870 else
871 info->var.vmode &= ~FB_VMODE_YWRAP;
872 return 0;
873 }
874
875 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
876 u32 activate)
877 {
878 struct fb_event event;
879 struct fb_blit_caps caps, fbcaps;
880 int err = 0;
881
882 memset(&caps, 0, sizeof(caps));
883 memset(&fbcaps, 0, sizeof(fbcaps));
884 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
885 event.info = info;
886 event.data = &caps;
887 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
888 info->fbops->fb_get_caps(info, &fbcaps, var);
889
890 if (((fbcaps.x ^ caps.x) & caps.x) ||
891 ((fbcaps.y ^ caps.y) & caps.y) ||
892 (fbcaps.len < caps.len))
893 err = -EINVAL;
894
895 return err;
896 }
897
898 int
899 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
900 {
901 int flags = info->flags;
902 int ret = 0;
903
904 if (var->activate & FB_ACTIVATE_INV_MODE) {
905 struct fb_videomode mode1, mode2;
906
907 fb_var_to_videomode(&mode1, var);
908 fb_var_to_videomode(&mode2, &info->var);
909 /* make sure we don't delete the videomode of current var */
910 ret = fb_mode_is_equal(&mode1, &mode2);
911
912 if (!ret) {
913 struct fb_event event;
914
915 event.info = info;
916 event.data = &mode1;
917 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
918 }
919
920 if (!ret)
921 fb_delete_videomode(&mode1, &info->modelist);
922
923
924 ret = (ret) ? -EINVAL : 0;
925 goto done;
926 }
927
928 if ((var->activate & FB_ACTIVATE_FORCE) ||
929 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
930 u32 activate = var->activate;
931
932 if (!info->fbops->fb_check_var) {
933 *var = info->var;
934 goto done;
935 }
936
937 ret = info->fbops->fb_check_var(var, info);
938
939 if (ret)
940 goto done;
941
942 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
943 struct fb_videomode mode;
944
945 if (info->fbops->fb_get_caps) {
946 ret = fb_check_caps(info, var, activate);
947
948 if (ret)
949 goto done;
950 }
951
952 info->var = *var;
953
954 if (info->fbops->fb_set_par)
955 info->fbops->fb_set_par(info);
956
957 fb_pan_display(info, &info->var);
958 fb_set_cmap(&info->cmap, info);
959 fb_var_to_videomode(&mode, &info->var);
960
961 if (info->modelist.prev && info->modelist.next &&
962 !list_empty(&info->modelist))
963 ret = fb_add_videomode(&mode, &info->modelist);
964
965 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
966 struct fb_event event;
967 int evnt = (activate & FB_ACTIVATE_ALL) ?
968 FB_EVENT_MODE_CHANGE_ALL :
969 FB_EVENT_MODE_CHANGE;
970
971 info->flags &= ~FBINFO_MISC_USEREVENT;
972 event.info = info;
973 event.data = &mode;
974 fb_notifier_call_chain(evnt, &event);
975 }
976 }
977 }
978
979 done:
980 return ret;
981 }
982
983 int
984 fb_blank(struct fb_info *info, int blank)
985 {
986 int ret = -EINVAL;
987
988 if (blank > FB_BLANK_POWERDOWN)
989 blank = FB_BLANK_POWERDOWN;
990
991 if (info->fbops->fb_blank)
992 ret = info->fbops->fb_blank(blank, info);
993
994 if (!ret) {
995 struct fb_event event;
996
997 event.info = info;
998 event.data = &blank;
999 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1000 }
1001
1002 return ret;
1003 }
1004
1005 static int
1006 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1007 unsigned long arg)
1008 {
1009 int fbidx = iminor(inode);
1010 struct fb_info *info = registered_fb[fbidx];
1011 struct fb_ops *fb = info->fbops;
1012 struct fb_var_screeninfo var;
1013 struct fb_fix_screeninfo fix;
1014 struct fb_con2fbmap con2fb;
1015 struct fb_cmap_user cmap;
1016 struct fb_event event;
1017 void __user *argp = (void __user *)arg;
1018 int i;
1019
1020 if (!fb)
1021 return -ENODEV;
1022 switch (cmd) {
1023 case FBIOGET_VSCREENINFO:
1024 return copy_to_user(argp, &info->var,
1025 sizeof(var)) ? -EFAULT : 0;
1026 case FBIOPUT_VSCREENINFO:
1027 if (copy_from_user(&var, argp, sizeof(var)))
1028 return -EFAULT;
1029 acquire_console_sem();
1030 info->flags |= FBINFO_MISC_USEREVENT;
1031 i = fb_set_var(info, &var);
1032 info->flags &= ~FBINFO_MISC_USEREVENT;
1033 release_console_sem();
1034 if (i) return i;
1035 if (copy_to_user(argp, &var, sizeof(var)))
1036 return -EFAULT;
1037 return 0;
1038 case FBIOGET_FSCREENINFO:
1039 return copy_to_user(argp, &info->fix,
1040 sizeof(fix)) ? -EFAULT : 0;
1041 case FBIOPUTCMAP:
1042 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1043 return -EFAULT;
1044 return (fb_set_user_cmap(&cmap, info));
1045 case FBIOGETCMAP:
1046 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1047 return -EFAULT;
1048 return fb_cmap_to_user(&info->cmap, &cmap);
1049 case FBIOPAN_DISPLAY:
1050 if (copy_from_user(&var, argp, sizeof(var)))
1051 return -EFAULT;
1052 acquire_console_sem();
1053 i = fb_pan_display(info, &var);
1054 release_console_sem();
1055 if (i)
1056 return i;
1057 if (copy_to_user(argp, &var, sizeof(var)))
1058 return -EFAULT;
1059 return 0;
1060 case FBIO_CURSOR:
1061 return -EINVAL;
1062 case FBIOGET_CON2FBMAP:
1063 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1064 return -EFAULT;
1065 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1066 return -EINVAL;
1067 con2fb.framebuffer = -1;
1068 event.info = info;
1069 event.data = &con2fb;
1070 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1071 return copy_to_user(argp, &con2fb,
1072 sizeof(con2fb)) ? -EFAULT : 0;
1073 case FBIOPUT_CON2FBMAP:
1074 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1075 return - EFAULT;
1076 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1077 return -EINVAL;
1078 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1079 return -EINVAL;
1080 if (!registered_fb[con2fb.framebuffer])
1081 request_module("fb%d", con2fb.framebuffer);
1082 if (!registered_fb[con2fb.framebuffer])
1083 return -EINVAL;
1084 event.info = info;
1085 event.data = &con2fb;
1086 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1087 &event);
1088 case FBIOBLANK:
1089 acquire_console_sem();
1090 info->flags |= FBINFO_MISC_USEREVENT;
1091 i = fb_blank(info, arg);
1092 info->flags &= ~FBINFO_MISC_USEREVENT;
1093 release_console_sem();
1094 return i;
1095 default:
1096 if (fb->fb_ioctl == NULL)
1097 return -EINVAL;
1098 return fb->fb_ioctl(info, cmd, arg);
1099 }
1100 }
1101
1102 #ifdef CONFIG_COMPAT
1103 struct fb_fix_screeninfo32 {
1104 char id[16];
1105 compat_caddr_t smem_start;
1106 u32 smem_len;
1107 u32 type;
1108 u32 type_aux;
1109 u32 visual;
1110 u16 xpanstep;
1111 u16 ypanstep;
1112 u16 ywrapstep;
1113 u32 line_length;
1114 compat_caddr_t mmio_start;
1115 u32 mmio_len;
1116 u32 accel;
1117 u16 reserved[3];
1118 };
1119
1120 struct fb_cmap32 {
1121 u32 start;
1122 u32 len;
1123 compat_caddr_t red;
1124 compat_caddr_t green;
1125 compat_caddr_t blue;
1126 compat_caddr_t transp;
1127 };
1128
1129 static int fb_getput_cmap(struct inode *inode, struct file *file,
1130 unsigned int cmd, unsigned long arg)
1131 {
1132 struct fb_cmap_user __user *cmap;
1133 struct fb_cmap32 __user *cmap32;
1134 __u32 data;
1135 int err;
1136
1137 cmap = compat_alloc_user_space(sizeof(*cmap));
1138 cmap32 = compat_ptr(arg);
1139
1140 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1141 return -EFAULT;
1142
1143 if (get_user(data, &cmap32->red) ||
1144 put_user(compat_ptr(data), &cmap->red) ||
1145 get_user(data, &cmap32->green) ||
1146 put_user(compat_ptr(data), &cmap->green) ||
1147 get_user(data, &cmap32->blue) ||
1148 put_user(compat_ptr(data), &cmap->blue) ||
1149 get_user(data, &cmap32->transp) ||
1150 put_user(compat_ptr(data), &cmap->transp))
1151 return -EFAULT;
1152
1153 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1154
1155 if (!err) {
1156 if (copy_in_user(&cmap32->start,
1157 &cmap->start,
1158 2 * sizeof(__u32)))
1159 err = -EFAULT;
1160 }
1161 return err;
1162 }
1163
1164 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1165 struct fb_fix_screeninfo32 __user *fix32)
1166 {
1167 __u32 data;
1168 int err;
1169
1170 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1171
1172 data = (__u32) (unsigned long) fix->smem_start;
1173 err |= put_user(data, &fix32->smem_start);
1174
1175 err |= put_user(fix->smem_len, &fix32->smem_len);
1176 err |= put_user(fix->type, &fix32->type);
1177 err |= put_user(fix->type_aux, &fix32->type_aux);
1178 err |= put_user(fix->visual, &fix32->visual);
1179 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1180 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1181 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1182 err |= put_user(fix->line_length, &fix32->line_length);
1183
1184 data = (__u32) (unsigned long) fix->mmio_start;
1185 err |= put_user(data, &fix32->mmio_start);
1186
1187 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1188 err |= put_user(fix->accel, &fix32->accel);
1189 err |= copy_to_user(fix32->reserved, fix->reserved,
1190 sizeof(fix->reserved));
1191
1192 return err;
1193 }
1194
1195 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1196 unsigned int cmd, unsigned long arg)
1197 {
1198 mm_segment_t old_fs;
1199 struct fb_fix_screeninfo fix;
1200 struct fb_fix_screeninfo32 __user *fix32;
1201 int err;
1202
1203 fix32 = compat_ptr(arg);
1204
1205 old_fs = get_fs();
1206 set_fs(KERNEL_DS);
1207 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1208 set_fs(old_fs);
1209
1210 if (!err)
1211 err = do_fscreeninfo_to_user(&fix, fix32);
1212
1213 return err;
1214 }
1215
1216 static long
1217 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1218 {
1219 struct inode *inode = file->f_path.dentry->d_inode;
1220 int fbidx = iminor(inode);
1221 struct fb_info *info = registered_fb[fbidx];
1222 struct fb_ops *fb = info->fbops;
1223 long ret = -ENOIOCTLCMD;
1224
1225 lock_kernel();
1226 switch(cmd) {
1227 case FBIOGET_VSCREENINFO:
1228 case FBIOPUT_VSCREENINFO:
1229 case FBIOPAN_DISPLAY:
1230 case FBIOGET_CON2FBMAP:
1231 case FBIOPUT_CON2FBMAP:
1232 arg = (unsigned long) compat_ptr(arg);
1233 case FBIOBLANK:
1234 ret = fb_ioctl(inode, file, cmd, arg);
1235 break;
1236
1237 case FBIOGET_FSCREENINFO:
1238 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1239 break;
1240
1241 case FBIOGETCMAP:
1242 case FBIOPUTCMAP:
1243 ret = fb_getput_cmap(inode, file, cmd, arg);
1244 break;
1245
1246 default:
1247 if (fb->fb_compat_ioctl)
1248 ret = fb->fb_compat_ioctl(info, cmd, arg);
1249 break;
1250 }
1251 unlock_kernel();
1252 return ret;
1253 }
1254 #endif
1255
1256 static int
1257 fb_mmap(struct file *file, struct vm_area_struct * vma)
1258 {
1259 int fbidx = iminor(file->f_path.dentry->d_inode);
1260 struct fb_info *info = registered_fb[fbidx];
1261 struct fb_ops *fb = info->fbops;
1262 unsigned long off;
1263 unsigned long start;
1264 u32 len;
1265
1266 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1267 return -EINVAL;
1268 off = vma->vm_pgoff << PAGE_SHIFT;
1269 if (!fb)
1270 return -ENODEV;
1271 if (fb->fb_mmap) {
1272 int res;
1273 lock_kernel();
1274 res = fb->fb_mmap(info, vma);
1275 unlock_kernel();
1276 return res;
1277 }
1278
1279 lock_kernel();
1280
1281 /* frame buffer memory */
1282 start = info->fix.smem_start;
1283 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1284 if (off >= len) {
1285 /* memory mapped io */
1286 off -= len;
1287 if (info->var.accel_flags) {
1288 unlock_kernel();
1289 return -EINVAL;
1290 }
1291 start = info->fix.mmio_start;
1292 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1293 }
1294 unlock_kernel();
1295 start &= PAGE_MASK;
1296 if ((vma->vm_end - vma->vm_start + off) > len)
1297 return -EINVAL;
1298 off += start;
1299 vma->vm_pgoff = off >> PAGE_SHIFT;
1300 /* This is an IO map - tell maydump to skip this VMA */
1301 vma->vm_flags |= VM_IO | VM_RESERVED;
1302 fb_pgprotect(file, vma, off);
1303 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1304 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1305 return -EAGAIN;
1306 return 0;
1307 }
1308
1309 static int
1310 fb_open(struct inode *inode, struct file *file)
1311 {
1312 int fbidx = iminor(inode);
1313 struct fb_info *info;
1314 int res = 0;
1315
1316 if (fbidx >= FB_MAX)
1317 return -ENODEV;
1318 lock_kernel();
1319 if (!(info = registered_fb[fbidx]))
1320 request_module("fb%d", fbidx);
1321 if (!(info = registered_fb[fbidx])) {
1322 res = -ENODEV;
1323 goto out;
1324 }
1325 if (!try_module_get(info->fbops->owner)) {
1326 res = -ENODEV;
1327 goto out;
1328 }
1329 file->private_data = info;
1330 if (info->fbops->fb_open) {
1331 res = info->fbops->fb_open(info,1);
1332 if (res)
1333 module_put(info->fbops->owner);
1334 }
1335 #ifdef CONFIG_FB_DEFERRED_IO
1336 if (info->fbdefio)
1337 fb_deferred_io_open(info, inode, file);
1338 #endif
1339 out:
1340 unlock_kernel();
1341 return res;
1342 }
1343
1344 static int
1345 fb_release(struct inode *inode, struct file *file)
1346 {
1347 struct fb_info * const info = file->private_data;
1348
1349 lock_kernel();
1350 if (info->fbops->fb_release)
1351 info->fbops->fb_release(info,1);
1352 module_put(info->fbops->owner);
1353 unlock_kernel();
1354 return 0;
1355 }
1356
1357 static const struct file_operations fb_fops = {
1358 .owner = THIS_MODULE,
1359 .read = fb_read,
1360 .write = fb_write,
1361 .ioctl = fb_ioctl,
1362 #ifdef CONFIG_COMPAT
1363 .compat_ioctl = fb_compat_ioctl,
1364 #endif
1365 .mmap = fb_mmap,
1366 .open = fb_open,
1367 .release = fb_release,
1368 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1369 .get_unmapped_area = get_fb_unmapped_area,
1370 #endif
1371 #ifdef CONFIG_FB_DEFERRED_IO
1372 .fsync = fb_deferred_io_fsync,
1373 #endif
1374 };
1375
1376 struct class *fb_class;
1377 EXPORT_SYMBOL(fb_class);
1378
1379 static int fb_check_foreignness(struct fb_info *fi)
1380 {
1381 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1382
1383 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1384
1385 #ifdef __BIG_ENDIAN
1386 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1387 #else
1388 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1389 #endif /* __BIG_ENDIAN */
1390
1391 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1392 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1393 "support this framebuffer\n", fi->fix.id);
1394 return -ENOSYS;
1395 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1396 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1397 "support this framebuffer\n", fi->fix.id);
1398 return -ENOSYS;
1399 }
1400
1401 return 0;
1402 }
1403
1404 /**
1405 * register_framebuffer - registers a frame buffer device
1406 * @fb_info: frame buffer info structure
1407 *
1408 * Registers a frame buffer device @fb_info.
1409 *
1410 * Returns negative errno on error, or zero for success.
1411 *
1412 */
1413
1414 int
1415 register_framebuffer(struct fb_info *fb_info)
1416 {
1417 int i;
1418 struct fb_event event;
1419 struct fb_videomode mode;
1420
1421 if (num_registered_fb == FB_MAX)
1422 return -ENXIO;
1423
1424 if (fb_check_foreignness(fb_info))
1425 return -ENOSYS;
1426
1427 num_registered_fb++;
1428 for (i = 0 ; i < FB_MAX; i++)
1429 if (!registered_fb[i])
1430 break;
1431 fb_info->node = i;
1432
1433 fb_info->dev = device_create(fb_class, fb_info->device,
1434 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1435 if (IS_ERR(fb_info->dev)) {
1436 /* Not fatal */
1437 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1438 fb_info->dev = NULL;
1439 } else
1440 fb_init_device(fb_info);
1441
1442 if (fb_info->pixmap.addr == NULL) {
1443 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1444 if (fb_info->pixmap.addr) {
1445 fb_info->pixmap.size = FBPIXMAPSIZE;
1446 fb_info->pixmap.buf_align = 1;
1447 fb_info->pixmap.scan_align = 1;
1448 fb_info->pixmap.access_align = 32;
1449 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1450 }
1451 }
1452 fb_info->pixmap.offset = 0;
1453
1454 if (!fb_info->pixmap.blit_x)
1455 fb_info->pixmap.blit_x = ~(u32)0;
1456
1457 if (!fb_info->pixmap.blit_y)
1458 fb_info->pixmap.blit_y = ~(u32)0;
1459
1460 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1461 INIT_LIST_HEAD(&fb_info->modelist);
1462
1463 fb_var_to_videomode(&mode, &fb_info->var);
1464 fb_add_videomode(&mode, &fb_info->modelist);
1465 registered_fb[i] = fb_info;
1466
1467 event.info = fb_info;
1468 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1469 return 0;
1470 }
1471
1472
1473 /**
1474 * unregister_framebuffer - releases a frame buffer device
1475 * @fb_info: frame buffer info structure
1476 *
1477 * Unregisters a frame buffer device @fb_info.
1478 *
1479 * Returns negative errno on error, or zero for success.
1480 *
1481 * This function will also notify the framebuffer console
1482 * to release the driver.
1483 *
1484 * This is meant to be called within a driver's module_exit()
1485 * function. If this is called outside module_exit(), ensure
1486 * that the driver implements fb_open() and fb_release() to
1487 * check that no processes are using the device.
1488 */
1489
1490 int
1491 unregister_framebuffer(struct fb_info *fb_info)
1492 {
1493 struct fb_event event;
1494 int i, ret = 0;
1495
1496 i = fb_info->node;
1497 if (!registered_fb[i]) {
1498 ret = -EINVAL;
1499 goto done;
1500 }
1501
1502 event.info = fb_info;
1503 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1504
1505 if (ret) {
1506 ret = -EINVAL;
1507 goto done;
1508 }
1509
1510 if (fb_info->pixmap.addr &&
1511 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1512 kfree(fb_info->pixmap.addr);
1513 fb_destroy_modelist(&fb_info->modelist);
1514 registered_fb[i]=NULL;
1515 num_registered_fb--;
1516 fb_cleanup_device(fb_info);
1517 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1518 event.info = fb_info;
1519 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1520 done:
1521 return ret;
1522 }
1523
1524 /**
1525 * fb_set_suspend - low level driver signals suspend
1526 * @info: framebuffer affected
1527 * @state: 0 = resuming, !=0 = suspending
1528 *
1529 * This is meant to be used by low level drivers to
1530 * signal suspend/resume to the core & clients.
1531 * It must be called with the console semaphore held
1532 */
1533 void fb_set_suspend(struct fb_info *info, int state)
1534 {
1535 struct fb_event event;
1536
1537 event.info = info;
1538 if (state) {
1539 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1540 info->state = FBINFO_STATE_SUSPENDED;
1541 } else {
1542 info->state = FBINFO_STATE_RUNNING;
1543 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1544 }
1545 }
1546
1547 /**
1548 * fbmem_init - init frame buffer subsystem
1549 *
1550 * Initialize the frame buffer subsystem.
1551 *
1552 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1553 *
1554 */
1555
1556 static int __init
1557 fbmem_init(void)
1558 {
1559 proc_create("fb", 0, NULL, &fb_proc_fops);
1560
1561 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1562 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1563
1564 fb_class = class_create(THIS_MODULE, "graphics");
1565 if (IS_ERR(fb_class)) {
1566 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1567 fb_class = NULL;
1568 }
1569 return 0;
1570 }
1571
1572 #ifdef MODULE
1573 module_init(fbmem_init);
1574 static void __exit
1575 fbmem_exit(void)
1576 {
1577 remove_proc_entry("fb", NULL);
1578 class_destroy(fb_class);
1579 unregister_chrdev(FB_MAJOR, "fb");
1580 }
1581
1582 module_exit(fbmem_exit);
1583 MODULE_LICENSE("GPL");
1584 MODULE_DESCRIPTION("Framebuffer base");
1585 #else
1586 subsys_initcall(fbmem_init);
1587 #endif
1588
1589 int fb_new_modelist(struct fb_info *info)
1590 {
1591 struct fb_event event;
1592 struct fb_var_screeninfo var = info->var;
1593 struct list_head *pos, *n;
1594 struct fb_modelist *modelist;
1595 struct fb_videomode *m, mode;
1596 int err = 1;
1597
1598 list_for_each_safe(pos, n, &info->modelist) {
1599 modelist = list_entry(pos, struct fb_modelist, list);
1600 m = &modelist->mode;
1601 fb_videomode_to_var(&var, m);
1602 var.activate = FB_ACTIVATE_TEST;
1603 err = fb_set_var(info, &var);
1604 fb_var_to_videomode(&mode, &var);
1605 if (err || !fb_mode_is_equal(m, &mode)) {
1606 list_del(pos);
1607 kfree(pos);
1608 }
1609 }
1610
1611 err = 1;
1612
1613 if (!list_empty(&info->modelist)) {
1614 event.info = info;
1615 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1616 }
1617
1618 return err;
1619 }
1620
1621 static char *video_options[FB_MAX] __read_mostly;
1622 static int ofonly __read_mostly;
1623
1624 /**
1625 * fb_get_options - get kernel boot parameters
1626 * @name: framebuffer name as it would appear in
1627 * the boot parameter line
1628 * (video=<name>:<options>)
1629 * @option: the option will be stored here
1630 *
1631 * NOTE: Needed to maintain backwards compatibility
1632 */
1633 int fb_get_options(char *name, char **option)
1634 {
1635 char *opt, *options = NULL;
1636 int opt_len, retval = 0;
1637 int name_len = strlen(name), i;
1638
1639 if (name_len && ofonly && strncmp(name, "offb", 4))
1640 retval = 1;
1641
1642 if (name_len && !retval) {
1643 for (i = 0; i < FB_MAX; i++) {
1644 if (video_options[i] == NULL)
1645 continue;
1646 opt_len = strlen(video_options[i]);
1647 if (!opt_len)
1648 continue;
1649 opt = video_options[i];
1650 if (!strncmp(name, opt, name_len) &&
1651 opt[name_len] == ':')
1652 options = opt + name_len + 1;
1653 }
1654 }
1655 if (options && !strncmp(options, "off", 3))
1656 retval = 1;
1657
1658 if (option)
1659 *option = options;
1660
1661 return retval;
1662 }
1663
1664 #ifndef MODULE
1665 /**
1666 * video_setup - process command line options
1667 * @options: string of options
1668 *
1669 * Process command line options for frame buffer subsystem.
1670 *
1671 * NOTE: This function is a __setup and __init function.
1672 * It only stores the options. Drivers have to call
1673 * fb_get_options() as necessary.
1674 *
1675 * Returns zero.
1676 *
1677 */
1678 static int __init video_setup(char *options)
1679 {
1680 int i, global = 0;
1681
1682 if (!options || !*options)
1683 global = 1;
1684
1685 if (!global && !strncmp(options, "ofonly", 6)) {
1686 ofonly = 1;
1687 global = 1;
1688 }
1689
1690 if (!global && !strstr(options, "fb:")) {
1691 fb_mode_option = options;
1692 global = 1;
1693 }
1694
1695 if (!global) {
1696 for (i = 0; i < FB_MAX; i++) {
1697 if (video_options[i] == NULL) {
1698 video_options[i] = options;
1699 break;
1700 }
1701
1702 }
1703 }
1704
1705 return 1;
1706 }
1707 __setup("video=", video_setup);
1708 #endif
1709
1710 /*
1711 * Visible symbols for modules
1712 */
1713
1714 EXPORT_SYMBOL(register_framebuffer);
1715 EXPORT_SYMBOL(unregister_framebuffer);
1716 EXPORT_SYMBOL(num_registered_fb);
1717 EXPORT_SYMBOL(registered_fb);
1718 EXPORT_SYMBOL(fb_show_logo);
1719 EXPORT_SYMBOL(fb_set_var);
1720 EXPORT_SYMBOL(fb_blank);
1721 EXPORT_SYMBOL(fb_pan_display);
1722 EXPORT_SYMBOL(fb_get_buffer_offset);
1723 EXPORT_SYMBOL(fb_set_suspend);
1724 EXPORT_SYMBOL(fb_get_options);
1725
1726 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree