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[CPUFREQ] fix BUG on cpufreq policy init failure
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmem.c
blobe2bf95370e40bd63a5743b2ee26f5b6cd302095b
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/kernel.h>
20 #include <linux/major.h>
21 #include <linux/slab.h>
22 #include <linux/mm.h>
23 #include <linux/mman.h>
24 #include <linux/vt.h>
25 #include <linux/init.h>
26 #include <linux/linux_logo.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/console.h>
30 #include <linux/kmod.h>
31 #include <linux/err.h>
32 #include <linux/device.h>
33 #include <linux/efi.h>
34 #include <linux/fb.h>
35
36 #include <asm/fb.h>
37
38
39 /*
40 * Frame buffer device initialization and setup routines
41 */
42
43 #define FBPIXMAPSIZE (1024 * 8)
44
45 struct fb_info *registered_fb[FB_MAX] __read_mostly;
46 int num_registered_fb __read_mostly;
47
48 int lock_fb_info(struct fb_info *info)
49 {
50 mutex_lock(&info->lock);
51 if (!info->fbops) {
52 mutex_unlock(&info->lock);
53 return 0;
54 }
55 return 1;
56 }
57 EXPORT_SYMBOL(lock_fb_info);
58
59 /*
60 * Helpers
61 */
62
63 int fb_get_color_depth(struct fb_var_screeninfo *var,
64 struct fb_fix_screeninfo *fix)
65 {
66 int depth = 0;
67
68 if (fix->visual == FB_VISUAL_MONO01 ||
69 fix->visual == FB_VISUAL_MONO10)
70 depth = 1;
71 else {
72 if (var->green.length == var->blue.length &&
73 var->green.length == var->red.length &&
74 var->green.offset == var->blue.offset &&
75 var->green.offset == var->red.offset)
76 depth = var->green.length;
77 else
78 depth = var->green.length + var->red.length +
79 var->blue.length;
80 }
81
82 return depth;
83 }
84 EXPORT_SYMBOL(fb_get_color_depth);
85
86 /*
87 * Data padding functions.
88 */
89 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
90 {
91 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
92 }
93 EXPORT_SYMBOL(fb_pad_aligned_buffer);
94
95 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
96 u32 shift_high, u32 shift_low, u32 mod)
97 {
98 u8 mask = (u8) (0xfff << shift_high), tmp;
99 int i, j;
100
101 for (i = height; i--; ) {
102 for (j = 0; j < idx; j++) {
103 tmp = dst[j];
104 tmp &= mask;
105 tmp |= *src >> shift_low;
106 dst[j] = tmp;
107 tmp = *src << shift_high;
108 dst[j+1] = tmp;
109 src++;
110 }
111 tmp = dst[idx];
112 tmp &= mask;
113 tmp |= *src >> shift_low;
114 dst[idx] = tmp;
115 if (shift_high < mod) {
116 tmp = *src << shift_high;
117 dst[idx+1] = tmp;
118 }
119 src++;
120 dst += d_pitch;
121 }
122 }
123 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
124
125 /*
126 * we need to lock this section since fb_cursor
127 * may use fb_imageblit()
128 */
129 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
130 {
131 u32 align = buf->buf_align - 1, offset;
132 char *addr = buf->addr;
133
134 /* If IO mapped, we need to sync before access, no sharing of
135 * the pixmap is done
136 */
137 if (buf->flags & FB_PIXMAP_IO) {
138 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
139 info->fbops->fb_sync(info);
140 return addr;
141 }
142
143 /* See if we fit in the remaining pixmap space */
144 offset = buf->offset + align;
145 offset &= ~align;
146 if (offset + size > buf->size) {
147 /* We do not fit. In order to be able to re-use the buffer,
148 * we must ensure no asynchronous DMA'ing or whatever operation
149 * is in progress, we sync for that.
150 */
151 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
152 info->fbops->fb_sync(info);
153 offset = 0;
154 }
155 buf->offset = offset + size;
156 addr += offset;
157
158 return addr;
159 }
160
161 #ifdef CONFIG_LOGO
162
163 static inline unsigned safe_shift(unsigned d, int n)
164 {
165 return n < 0 ? d >> -n : d << n;
166 }
167
168 static void fb_set_logocmap(struct fb_info *info,
169 const struct linux_logo *logo)
170 {
171 struct fb_cmap palette_cmap;
172 u16 palette_green[16];
173 u16 palette_blue[16];
174 u16 palette_red[16];
175 int i, j, n;
176 const unsigned char *clut = logo->clut;
177
178 palette_cmap.start = 0;
179 palette_cmap.len = 16;
180 palette_cmap.red = palette_red;
181 palette_cmap.green = palette_green;
182 palette_cmap.blue = palette_blue;
183 palette_cmap.transp = NULL;
184
185 for (i = 0; i < logo->clutsize; i += n) {
186 n = logo->clutsize - i;
187 /* palette_cmap provides space for only 16 colors at once */
188 if (n > 16)
189 n = 16;
190 palette_cmap.start = 32 + i;
191 palette_cmap.len = n;
192 for (j = 0; j < n; ++j) {
193 palette_cmap.red[j] = clut[0] << 8 | clut[0];
194 palette_cmap.green[j] = clut[1] << 8 | clut[1];
195 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
196 clut += 3;
197 }
198 fb_set_cmap(&palette_cmap, info);
199 }
200 }
201
202 static void fb_set_logo_truepalette(struct fb_info *info,
203 const struct linux_logo *logo,
204 u32 *palette)
205 {
206 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
207 unsigned char redmask, greenmask, bluemask;
208 int redshift, greenshift, blueshift;
209 int i;
210 const unsigned char *clut = logo->clut;
211
212 /*
213 * We have to create a temporary palette since console palette is only
214 * 16 colors long.
215 */
216 /* Bug: Doesn't obey msb_right ... (who needs that?) */
217 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
218 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
219 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
220 redshift = info->var.red.offset - (8 - info->var.red.length);
221 greenshift = info->var.green.offset - (8 - info->var.green.length);
222 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
223
224 for ( i = 0; i < logo->clutsize; i++) {
225 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
226 safe_shift((clut[1] & greenmask), greenshift) |
227 safe_shift((clut[2] & bluemask), blueshift));
228 clut += 3;
229 }
230 }
231
232 static void fb_set_logo_directpalette(struct fb_info *info,
233 const struct linux_logo *logo,
234 u32 *palette)
235 {
236 int redshift, greenshift, blueshift;
237 int i;
238
239 redshift = info->var.red.offset;
240 greenshift = info->var.green.offset;
241 blueshift = info->var.blue.offset;
242
243 for (i = 32; i < 32 + logo->clutsize; i++)
244 palette[i] = i << redshift | i << greenshift | i << blueshift;
245 }
246
247 static void fb_set_logo(struct fb_info *info,
248 const struct linux_logo *logo, u8 *dst,
249 int depth)
250 {
251 int i, j, k;
252 const u8 *src = logo->data;
253 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
254 u8 fg = 1, d;
255
256 switch (fb_get_color_depth(&info->var, &info->fix)) {
257 case 1:
258 fg = 1;
259 break;
260 case 2:
261 fg = 3;
262 break;
263 default:
264 fg = 7;
265 break;
266 }
267
268 if (info->fix.visual == FB_VISUAL_MONO01 ||
269 info->fix.visual == FB_VISUAL_MONO10)
270 fg = ~((u8) (0xfff << info->var.green.length));
271
272 switch (depth) {
273 case 4:
274 for (i = 0; i < logo->height; i++)
275 for (j = 0; j < logo->width; src++) {
276 *dst++ = *src >> 4;
277 j++;
278 if (j < logo->width) {
279 *dst++ = *src & 0x0f;
280 j++;
281 }
282 }
283 break;
284 case 1:
285 for (i = 0; i < logo->height; i++) {
286 for (j = 0; j < logo->width; src++) {
287 d = *src ^ xor;
288 for (k = 7; k >= 0; k--) {
289 *dst++ = ((d >> k) & 1) ? fg : 0;
290 j++;
291 }
292 }
293 }
294 break;
295 }
296 }
297
298 /*
299 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
300 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
301 * the visual format and color depth of the framebuffer, the DAC, the
302 * pseudo_palette, and the logo data will be adjusted accordingly.
303 *
304 * Case 1 - linux_logo_clut224:
305 * Color exceeds the number of console colors (16), thus we set the hardware DAC
306 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
307 *
308 * For visuals that require color info from the pseudo_palette, we also construct
309 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
310 * will be set.
311 *
312 * Case 2 - linux_logo_vga16:
313 * The number of colors just matches the console colors, thus there is no need
314 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
315 * each byte contains color information for two pixels (upper and lower nibble).
316 * To be consistent with fb_imageblit() usage, we therefore separate the two
317 * nibbles into separate bytes. The "depth" flag will be set to 4.
318 *
319 * Case 3 - linux_logo_mono:
320 * This is similar with Case 2. Each byte contains information for 8 pixels.
321 * We isolate each bit and expand each into a byte. The "depth" flag will
322 * be set to 1.
323 */
324 static struct logo_data {
325 int depth;
326 int needs_directpalette;
327 int needs_truepalette;
328 int needs_cmapreset;
329 const struct linux_logo *logo;
330 } fb_logo __read_mostly;
331
332 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334 u32 size = width * height, i;
335
336 out += size - 1;
337
338 for (i = size; i--; )
339 *out-- = *in++;
340 }
341
342 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
343 {
344 int i, j, h = height - 1;
345
346 for (i = 0; i < height; i++)
347 for (j = 0; j < width; j++)
348 out[height * j + h - i] = *in++;
349 }
350
351 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
352 {
353 int i, j, w = width - 1;
354
355 for (i = 0; i < height; i++)
356 for (j = 0; j < width; j++)
357 out[height * (w - j) + i] = *in++;
358 }
359
360 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
361 struct fb_image *image, int rotate)
362 {
363 u32 tmp;
364
365 if (rotate == FB_ROTATE_UD) {
366 fb_rotate_logo_ud(image->data, dst, image->width,
367 image->height);
368 image->dx = info->var.xres - image->width - image->dx;
369 image->dy = info->var.yres - image->height - image->dy;
370 } else if (rotate == FB_ROTATE_CW) {
371 fb_rotate_logo_cw(image->data, dst, image->width,
372 image->height);
373 tmp = image->width;
374 image->width = image->height;
375 image->height = tmp;
376 tmp = image->dy;
377 image->dy = image->dx;
378 image->dx = info->var.xres - image->width - tmp;
379 } else if (rotate == FB_ROTATE_CCW) {
380 fb_rotate_logo_ccw(image->data, dst, image->width,
381 image->height);
382 tmp = image->width;
383 image->width = image->height;
384 image->height = tmp;
385 tmp = image->dx;
386 image->dx = image->dy;
387 image->dy = info->var.yres - image->height - tmp;
388 }
389
390 image->data = dst;
391 }
392
393 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
394 int rotate, unsigned int num)
395 {
396 unsigned int x;
397
398 if (rotate == FB_ROTATE_UR) {
399 for (x = 0;
400 x < num && image->dx + image->width <= info->var.xres;
401 x++) {
402 info->fbops->fb_imageblit(info, image);
403 image->dx += image->width + 8;
404 }
405 } else if (rotate == FB_ROTATE_UD) {
406 for (x = 0; x < num && image->dx >= 0; x++) {
407 info->fbops->fb_imageblit(info, image);
408 image->dx -= image->width + 8;
409 }
410 } else if (rotate == FB_ROTATE_CW) {
411 for (x = 0;
412 x < num && image->dy + image->height <= info->var.yres;
413 x++) {
414 info->fbops->fb_imageblit(info, image);
415 image->dy += image->height + 8;
416 }
417 } else if (rotate == FB_ROTATE_CCW) {
418 for (x = 0; x < num && image->dy >= 0; x++) {
419 info->fbops->fb_imageblit(info, image);
420 image->dy -= image->height + 8;
421 }
422 }
423 }
424
425 static int fb_show_logo_line(struct fb_info *info, int rotate,
426 const struct linux_logo *logo, int y,
427 unsigned int n)
428 {
429 u32 *palette = NULL, *saved_pseudo_palette = NULL;
430 unsigned char *logo_new = NULL, *logo_rotate = NULL;
431 struct fb_image image;
432
433 /* Return if the frame buffer is not mapped or suspended */
434 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
435 info->flags & FBINFO_MODULE)
436 return 0;
437
438 image.depth = 8;
439 image.data = logo->data;
440
441 if (fb_logo.needs_cmapreset)
442 fb_set_logocmap(info, logo);
443
444 if (fb_logo.needs_truepalette ||
445 fb_logo.needs_directpalette) {
446 palette = kmalloc(256 * 4, GFP_KERNEL);
447 if (palette == NULL)
448 return 0;
449
450 if (fb_logo.needs_truepalette)
451 fb_set_logo_truepalette(info, logo, palette);
452 else
453 fb_set_logo_directpalette(info, logo, palette);
454
455 saved_pseudo_palette = info->pseudo_palette;
456 info->pseudo_palette = palette;
457 }
458
459 if (fb_logo.depth <= 4) {
460 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
461 if (logo_new == NULL) {
462 kfree(palette);
463 if (saved_pseudo_palette)
464 info->pseudo_palette = saved_pseudo_palette;
465 return 0;
466 }
467 image.data = logo_new;
468 fb_set_logo(info, logo, logo_new, fb_logo.depth);
469 }
470
471 image.dx = 0;
472 image.dy = y;
473 image.width = logo->width;
474 image.height = logo->height;
475
476 if (rotate) {
477 logo_rotate = kmalloc(logo->width *
478 logo->height, GFP_KERNEL);
479 if (logo_rotate)
480 fb_rotate_logo(info, logo_rotate, &image, rotate);
481 }
482
483 fb_do_show_logo(info, &image, rotate, n);
484
485 kfree(palette);
486 if (saved_pseudo_palette != NULL)
487 info->pseudo_palette = saved_pseudo_palette;
488 kfree(logo_new);
489 kfree(logo_rotate);
490 return logo->height;
491 }
492
493
494 #ifdef CONFIG_FB_LOGO_EXTRA
495
496 #define FB_LOGO_EX_NUM_MAX 10
497 static struct logo_data_extra {
498 const struct linux_logo *logo;
499 unsigned int n;
500 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
501 static unsigned int fb_logo_ex_num;
502
503 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
504 {
505 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
506 return;
507
508 fb_logo_ex[fb_logo_ex_num].logo = logo;
509 fb_logo_ex[fb_logo_ex_num].n = n;
510 fb_logo_ex_num++;
511 }
512
513 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
514 unsigned int yres)
515 {
516 unsigned int i;
517
518 /* FIXME: logo_ex supports only truecolor fb. */
519 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
520 fb_logo_ex_num = 0;
521
522 for (i = 0; i < fb_logo_ex_num; i++) {
523 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
524 fb_logo_ex[i].logo = NULL;
525 continue;
526 }
527 height += fb_logo_ex[i].logo->height;
528 if (height > yres) {
529 height -= fb_logo_ex[i].logo->height;
530 fb_logo_ex_num = i;
531 break;
532 }
533 }
534 return height;
535 }
536
537 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
538 {
539 unsigned int i;
540
541 for (i = 0; i < fb_logo_ex_num; i++)
542 y += fb_show_logo_line(info, rotate,
543 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
544
545 return y;
546 }
547
548 #else /* !CONFIG_FB_LOGO_EXTRA */
549
550 static inline int fb_prepare_extra_logos(struct fb_info *info,
551 unsigned int height,
552 unsigned int yres)
553 {
554 return height;
555 }
556
557 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
558 {
559 return y;
560 }
561
562 #endif /* CONFIG_FB_LOGO_EXTRA */
563
564
565 int fb_prepare_logo(struct fb_info *info, int rotate)
566 {
567 int depth = fb_get_color_depth(&info->var, &info->fix);
568 unsigned int yres;
569
570 memset(&fb_logo, 0, sizeof(struct logo_data));
571
572 if (info->flags & FBINFO_MISC_TILEBLITTING ||
573 info->flags & FBINFO_MODULE)
574 return 0;
575
576 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
577 depth = info->var.blue.length;
578 if (info->var.red.length < depth)
579 depth = info->var.red.length;
580 if (info->var.green.length < depth)
581 depth = info->var.green.length;
582 }
583
584 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
585 /* assume console colormap */
586 depth = 4;
587 }
588
589 /* Return if no suitable logo was found */
590 fb_logo.logo = fb_find_logo(depth);
591
592 if (!fb_logo.logo) {
593 return 0;
594 }
595
596 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
597 yres = info->var.yres;
598 else
599 yres = info->var.xres;
600
601 if (fb_logo.logo->height > yres) {
602 fb_logo.logo = NULL;
603 return 0;
604 }
605
606 /* What depth we asked for might be different from what we get */
607 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
608 fb_logo.depth = 8;
609 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
610 fb_logo.depth = 4;
611 else
612 fb_logo.depth = 1;
613
614
615 if (fb_logo.depth > 4 && depth > 4) {
616 switch (info->fix.visual) {
617 case FB_VISUAL_TRUECOLOR:
618 fb_logo.needs_truepalette = 1;
619 break;
620 case FB_VISUAL_DIRECTCOLOR:
621 fb_logo.needs_directpalette = 1;
622 fb_logo.needs_cmapreset = 1;
623 break;
624 case FB_VISUAL_PSEUDOCOLOR:
625 fb_logo.needs_cmapreset = 1;
626 break;
627 }
628 }
629
630 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
631 }
632
633 int fb_show_logo(struct fb_info *info, int rotate)
634 {
635 int y;
636
637 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
638 num_online_cpus());
639 y = fb_show_extra_logos(info, y, rotate);
640
641 return y;
642 }
643 #else
644 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
645 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
646 #endif /* CONFIG_LOGO */
647
648 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
649 {
650 return (*pos < FB_MAX) ? pos : NULL;
651 }
652
653 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
654 {
655 (*pos)++;
656 return (*pos < FB_MAX) ? pos : NULL;
657 }
658
659 static void fb_seq_stop(struct seq_file *m, void *v)
660 {
661 }
662
663 static int fb_seq_show(struct seq_file *m, void *v)
664 {
665 int i = *(loff_t *)v;
666 struct fb_info *fi = registered_fb[i];
667
668 if (fi)
669 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
670 return 0;
671 }
672
673 static const struct seq_operations proc_fb_seq_ops = {
674 .start = fb_seq_start,
675 .next = fb_seq_next,
676 .stop = fb_seq_stop,
677 .show = fb_seq_show,
678 };
679
680 static int proc_fb_open(struct inode *inode, struct file *file)
681 {
682 return seq_open(file, &proc_fb_seq_ops);
683 }
684
685 static const struct file_operations fb_proc_fops = {
686 .owner = THIS_MODULE,
687 .open = proc_fb_open,
688 .read = seq_read,
689 .llseek = seq_lseek,
690 .release = seq_release,
691 };
692
693 static ssize_t
694 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
695 {
696 unsigned long p = *ppos;
697 struct inode *inode = file->f_path.dentry->d_inode;
698 int fbidx = iminor(inode);
699 struct fb_info *info = registered_fb[fbidx];
700 u8 *buffer, *dst;
701 u8 __iomem *src;
702 int c, cnt = 0, err = 0;
703 unsigned long total_size;
704
705 if (!info || ! info->screen_base)
706 return -ENODEV;
707
708 if (info->state != FBINFO_STATE_RUNNING)
709 return -EPERM;
710
711 if (info->fbops->fb_read)
712 return info->fbops->fb_read(info, buf, count, ppos);
713
714 total_size = info->screen_size;
715
716 if (total_size == 0)
717 total_size = info->fix.smem_len;
718
719 if (p >= total_size)
720 return 0;
721
722 if (count >= total_size)
723 count = total_size;
724
725 if (count + p > total_size)
726 count = total_size - p;
727
728 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
729 GFP_KERNEL);
730 if (!buffer)
731 return -ENOMEM;
732
733 src = (u8 __iomem *) (info->screen_base + p);
734
735 if (info->fbops->fb_sync)
736 info->fbops->fb_sync(info);
737
738 while (count) {
739 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
740 dst = buffer;
741 fb_memcpy_fromfb(dst, src, c);
742 dst += c;
743 src += c;
744
745 if (copy_to_user(buf, buffer, c)) {
746 err = -EFAULT;
747 break;
748 }
749 *ppos += c;
750 buf += c;
751 cnt += c;
752 count -= c;
753 }
754
755 kfree(buffer);
756
757 return (err) ? err : cnt;
758 }
759
760 static ssize_t
761 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
762 {
763 unsigned long p = *ppos;
764 struct inode *inode = file->f_path.dentry->d_inode;
765 int fbidx = iminor(inode);
766 struct fb_info *info = registered_fb[fbidx];
767 u8 *buffer, *src;
768 u8 __iomem *dst;
769 int c, cnt = 0, err = 0;
770 unsigned long total_size;
771
772 if (!info || !info->screen_base)
773 return -ENODEV;
774
775 if (info->state != FBINFO_STATE_RUNNING)
776 return -EPERM;
777
778 if (info->fbops->fb_write)
779 return info->fbops->fb_write(info, buf, count, ppos);
780
781 total_size = info->screen_size;
782
783 if (total_size == 0)
784 total_size = info->fix.smem_len;
785
786 if (p > total_size)
787 return -EFBIG;
788
789 if (count > total_size) {
790 err = -EFBIG;
791 count = total_size;
792 }
793
794 if (count + p > total_size) {
795 if (!err)
796 err = -ENOSPC;
797
798 count = total_size - p;
799 }
800
801 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
802 GFP_KERNEL);
803 if (!buffer)
804 return -ENOMEM;
805
806 dst = (u8 __iomem *) (info->screen_base + p);
807
808 if (info->fbops->fb_sync)
809 info->fbops->fb_sync(info);
810
811 while (count) {
812 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
813 src = buffer;
814
815 if (copy_from_user(src, buf, c)) {
816 err = -EFAULT;
817 break;
818 }
819
820 fb_memcpy_tofb(dst, src, c);
821 dst += c;
822 src += c;
823 *ppos += c;
824 buf += c;
825 cnt += c;
826 count -= c;
827 }
828
829 kfree(buffer);
830
831 return (cnt) ? cnt : err;
832 }
833
834 int
835 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
836 {
837 struct fb_fix_screeninfo *fix = &info->fix;
838 unsigned int yres = info->var.yres;
839 int err = 0;
840
841 if (var->yoffset > 0) {
842 if (var->vmode & FB_VMODE_YWRAP) {
843 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
844 err = -EINVAL;
845 else
846 yres = 0;
847 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
848 err = -EINVAL;
849 }
850
851 if (var->xoffset > 0 && (!fix->xpanstep ||
852 (var->xoffset % fix->xpanstep)))
853 err = -EINVAL;
854
855 if (err || !info->fbops->fb_pan_display ||
856 var->yoffset > info->var.yres_virtual - yres ||
857 var->xoffset > info->var.xres_virtual - info->var.xres)
858 return -EINVAL;
859
860 if ((err = info->fbops->fb_pan_display(var, info)))
861 return err;
862 info->var.xoffset = var->xoffset;
863 info->var.yoffset = var->yoffset;
864 if (var->vmode & FB_VMODE_YWRAP)
865 info->var.vmode |= FB_VMODE_YWRAP;
866 else
867 info->var.vmode &= ~FB_VMODE_YWRAP;
868 return 0;
869 }
870
871 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
872 u32 activate)
873 {
874 struct fb_event event;
875 struct fb_blit_caps caps, fbcaps;
876 int err = 0;
877
878 memset(&caps, 0, sizeof(caps));
879 memset(&fbcaps, 0, sizeof(fbcaps));
880 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
881 event.info = info;
882 event.data = &caps;
883 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
884 info->fbops->fb_get_caps(info, &fbcaps, var);
885
886 if (((fbcaps.x ^ caps.x) & caps.x) ||
887 ((fbcaps.y ^ caps.y) & caps.y) ||
888 (fbcaps.len < caps.len))
889 err = -EINVAL;
890
891 return err;
892 }
893
894 int
895 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
896 {
897 int flags = info->flags;
898 int ret = 0;
899
900 if (var->activate & FB_ACTIVATE_INV_MODE) {
901 struct fb_videomode mode1, mode2;
902
903 fb_var_to_videomode(&mode1, var);
904 fb_var_to_videomode(&mode2, &info->var);
905 /* make sure we don't delete the videomode of current var */
906 ret = fb_mode_is_equal(&mode1, &mode2);
907
908 if (!ret) {
909 struct fb_event event;
910
911 event.info = info;
912 event.data = &mode1;
913 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
914 }
915
916 if (!ret)
917 fb_delete_videomode(&mode1, &info->modelist);
918
919
920 ret = (ret) ? -EINVAL : 0;
921 goto done;
922 }
923
924 if ((var->activate & FB_ACTIVATE_FORCE) ||
925 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
926 u32 activate = var->activate;
927
928 if (!info->fbops->fb_check_var) {
929 *var = info->var;
930 goto done;
931 }
932
933 ret = info->fbops->fb_check_var(var, info);
934
935 if (ret)
936 goto done;
937
938 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
939 struct fb_var_screeninfo old_var;
940 struct fb_videomode mode;
941
942 if (info->fbops->fb_get_caps) {
943 ret = fb_check_caps(info, var, activate);
944
945 if (ret)
946 goto done;
947 }
948
949 old_var = info->var;
950 info->var = *var;
951
952 if (info->fbops->fb_set_par) {
953 ret = info->fbops->fb_set_par(info);
954
955 if (ret) {
956 info->var = old_var;
957 printk(KERN_WARNING "detected "
958 "fb_set_par error, "
959 "error code: %d\n", ret);
960 goto done;
961 }
962 }
963
964 fb_pan_display(info, &info->var);
965 fb_set_cmap(&info->cmap, info);
966 fb_var_to_videomode(&mode, &info->var);
967
968 if (info->modelist.prev && info->modelist.next &&
969 !list_empty(&info->modelist))
970 ret = fb_add_videomode(&mode, &info->modelist);
971
972 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
973 struct fb_event event;
974 int evnt = (activate & FB_ACTIVATE_ALL) ?
975 FB_EVENT_MODE_CHANGE_ALL :
976 FB_EVENT_MODE_CHANGE;
977
978 info->flags &= ~FBINFO_MISC_USEREVENT;
979 event.info = info;
980 event.data = &mode;
981 fb_notifier_call_chain(evnt, &event);
982 }
983 }
984 }
985
986 done:
987 return ret;
988 }
989
990 int
991 fb_blank(struct fb_info *info, int blank)
992 {
993 int ret = -EINVAL;
994
995 if (blank > FB_BLANK_POWERDOWN)
996 blank = FB_BLANK_POWERDOWN;
997
998 if (info->fbops->fb_blank)
999 ret = info->fbops->fb_blank(blank, info);
1000
1001 if (!ret) {
1002 struct fb_event event;
1003
1004 event.info = info;
1005 event.data = &blank;
1006 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1007 }
1008
1009 return ret;
1010 }
1011
1012 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1013 unsigned long arg)
1014 {
1015 struct fb_ops *fb;
1016 struct fb_var_screeninfo var;
1017 struct fb_fix_screeninfo fix;
1018 struct fb_con2fbmap con2fb;
1019 struct fb_cmap cmap_from;
1020 struct fb_cmap_user cmap;
1021 struct fb_event event;
1022 void __user *argp = (void __user *)arg;
1023 long ret = 0;
1024
1025 switch (cmd) {
1026 case FBIOGET_VSCREENINFO:
1027 if (!lock_fb_info(info))
1028 return -ENODEV;
1029 var = info->var;
1030 unlock_fb_info(info);
1031
1032 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1033 break;
1034 case FBIOPUT_VSCREENINFO:
1035 if (copy_from_user(&var, argp, sizeof(var)))
1036 return -EFAULT;
1037 if (!lock_fb_info(info))
1038 return -ENODEV;
1039 console_lock();
1040 info->flags |= FBINFO_MISC_USEREVENT;
1041 ret = fb_set_var(info, &var);
1042 info->flags &= ~FBINFO_MISC_USEREVENT;
1043 console_unlock();
1044 unlock_fb_info(info);
1045 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1046 ret = -EFAULT;
1047 break;
1048 case FBIOGET_FSCREENINFO:
1049 if (!lock_fb_info(info))
1050 return -ENODEV;
1051 fix = info->fix;
1052 unlock_fb_info(info);
1053
1054 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1055 break;
1056 case FBIOPUTCMAP:
1057 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1058 return -EFAULT;
1059 ret = fb_set_user_cmap(&cmap, info);
1060 break;
1061 case FBIOGETCMAP:
1062 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1063 return -EFAULT;
1064 if (!lock_fb_info(info))
1065 return -ENODEV;
1066 cmap_from = info->cmap;
1067 unlock_fb_info(info);
1068 ret = fb_cmap_to_user(&cmap_from, &cmap);
1069 break;
1070 case FBIOPAN_DISPLAY:
1071 if (copy_from_user(&var, argp, sizeof(var)))
1072 return -EFAULT;
1073 if (!lock_fb_info(info))
1074 return -ENODEV;
1075 console_lock();
1076 ret = fb_pan_display(info, &var);
1077 console_unlock();
1078 unlock_fb_info(info);
1079 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1080 return -EFAULT;
1081 break;
1082 case FBIO_CURSOR:
1083 ret = -EINVAL;
1084 break;
1085 case FBIOGET_CON2FBMAP:
1086 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1087 return -EFAULT;
1088 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1089 return -EINVAL;
1090 con2fb.framebuffer = -1;
1091 event.data = &con2fb;
1092 if (!lock_fb_info(info))
1093 return -ENODEV;
1094 event.info = info;
1095 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1096 unlock_fb_info(info);
1097 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1098 break;
1099 case FBIOPUT_CON2FBMAP:
1100 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1101 return -EFAULT;
1102 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1103 return -EINVAL;
1104 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1105 return -EINVAL;
1106 if (!registered_fb[con2fb.framebuffer])
1107 request_module("fb%d", con2fb.framebuffer);
1108 if (!registered_fb[con2fb.framebuffer]) {
1109 ret = -EINVAL;
1110 break;
1111 }
1112 event.data = &con2fb;
1113 if (!lock_fb_info(info))
1114 return -ENODEV;
1115 event.info = info;
1116 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1117 unlock_fb_info(info);
1118 break;
1119 case FBIOBLANK:
1120 if (!lock_fb_info(info))
1121 return -ENODEV;
1122 console_lock();
1123 info->flags |= FBINFO_MISC_USEREVENT;
1124 ret = fb_blank(info, arg);
1125 info->flags &= ~FBINFO_MISC_USEREVENT;
1126 console_unlock();
1127 unlock_fb_info(info);
1128 break;
1129 default:
1130 if (!lock_fb_info(info))
1131 return -ENODEV;
1132 fb = info->fbops;
1133 if (fb->fb_ioctl)
1134 ret = fb->fb_ioctl(info, cmd, arg);
1135 else
1136 ret = -ENOTTY;
1137 unlock_fb_info(info);
1138 }
1139 return ret;
1140 }
1141
1142 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1143 {
1144 struct inode *inode = file->f_path.dentry->d_inode;
1145 int fbidx = iminor(inode);
1146 struct fb_info *info = registered_fb[fbidx];
1147
1148 return do_fb_ioctl(info, cmd, arg);
1149 }
1150
1151 #ifdef CONFIG_COMPAT
1152 struct fb_fix_screeninfo32 {
1153 char id[16];
1154 compat_caddr_t smem_start;
1155 u32 smem_len;
1156 u32 type;
1157 u32 type_aux;
1158 u32 visual;
1159 u16 xpanstep;
1160 u16 ypanstep;
1161 u16 ywrapstep;
1162 u32 line_length;
1163 compat_caddr_t mmio_start;
1164 u32 mmio_len;
1165 u32 accel;
1166 u16 reserved[3];
1167 };
1168
1169 struct fb_cmap32 {
1170 u32 start;
1171 u32 len;
1172 compat_caddr_t red;
1173 compat_caddr_t green;
1174 compat_caddr_t blue;
1175 compat_caddr_t transp;
1176 };
1177
1178 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1179 unsigned long arg)
1180 {
1181 struct fb_cmap_user __user *cmap;
1182 struct fb_cmap32 __user *cmap32;
1183 __u32 data;
1184 int err;
1185
1186 cmap = compat_alloc_user_space(sizeof(*cmap));
1187 cmap32 = compat_ptr(arg);
1188
1189 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1190 return -EFAULT;
1191
1192 if (get_user(data, &cmap32->red) ||
1193 put_user(compat_ptr(data), &cmap->red) ||
1194 get_user(data, &cmap32->green) ||
1195 put_user(compat_ptr(data), &cmap->green) ||
1196 get_user(data, &cmap32->blue) ||
1197 put_user(compat_ptr(data), &cmap->blue) ||
1198 get_user(data, &cmap32->transp) ||
1199 put_user(compat_ptr(data), &cmap->transp))
1200 return -EFAULT;
1201
1202 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1203
1204 if (!err) {
1205 if (copy_in_user(&cmap32->start,
1206 &cmap->start,
1207 2 * sizeof(__u32)))
1208 err = -EFAULT;
1209 }
1210 return err;
1211 }
1212
1213 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1214 struct fb_fix_screeninfo32 __user *fix32)
1215 {
1216 __u32 data;
1217 int err;
1218
1219 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1220
1221 data = (__u32) (unsigned long) fix->smem_start;
1222 err |= put_user(data, &fix32->smem_start);
1223
1224 err |= put_user(fix->smem_len, &fix32->smem_len);
1225 err |= put_user(fix->type, &fix32->type);
1226 err |= put_user(fix->type_aux, &fix32->type_aux);
1227 err |= put_user(fix->visual, &fix32->visual);
1228 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1229 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1230 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1231 err |= put_user(fix->line_length, &fix32->line_length);
1232
1233 data = (__u32) (unsigned long) fix->mmio_start;
1234 err |= put_user(data, &fix32->mmio_start);
1235
1236 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1237 err |= put_user(fix->accel, &fix32->accel);
1238 err |= copy_to_user(fix32->reserved, fix->reserved,
1239 sizeof(fix->reserved));
1240
1241 return err;
1242 }
1243
1244 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1245 unsigned long arg)
1246 {
1247 mm_segment_t old_fs;
1248 struct fb_fix_screeninfo fix;
1249 struct fb_fix_screeninfo32 __user *fix32;
1250 int err;
1251
1252 fix32 = compat_ptr(arg);
1253
1254 old_fs = get_fs();
1255 set_fs(KERNEL_DS);
1256 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1257 set_fs(old_fs);
1258
1259 if (!err)
1260 err = do_fscreeninfo_to_user(&fix, fix32);
1261
1262 return err;
1263 }
1264
1265 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1266 unsigned long arg)
1267 {
1268 struct inode *inode = file->f_path.dentry->d_inode;
1269 int fbidx = iminor(inode);
1270 struct fb_info *info = registered_fb[fbidx];
1271 struct fb_ops *fb = info->fbops;
1272 long ret = -ENOIOCTLCMD;
1273
1274 switch(cmd) {
1275 case FBIOGET_VSCREENINFO:
1276 case FBIOPUT_VSCREENINFO:
1277 case FBIOPAN_DISPLAY:
1278 case FBIOGET_CON2FBMAP:
1279 case FBIOPUT_CON2FBMAP:
1280 arg = (unsigned long) compat_ptr(arg);
1281 case FBIOBLANK:
1282 ret = do_fb_ioctl(info, cmd, arg);
1283 break;
1284
1285 case FBIOGET_FSCREENINFO:
1286 ret = fb_get_fscreeninfo(info, cmd, arg);
1287 break;
1288
1289 case FBIOGETCMAP:
1290 case FBIOPUTCMAP:
1291 ret = fb_getput_cmap(info, cmd, arg);
1292 break;
1293
1294 default:
1295 if (fb->fb_compat_ioctl)
1296 ret = fb->fb_compat_ioctl(info, cmd, arg);
1297 break;
1298 }
1299 return ret;
1300 }
1301 #endif
1302
1303 static int
1304 fb_mmap(struct file *file, struct vm_area_struct * vma)
1305 {
1306 int fbidx = iminor(file->f_path.dentry->d_inode);
1307 struct fb_info *info = registered_fb[fbidx];
1308 struct fb_ops *fb = info->fbops;
1309 unsigned long off;
1310 unsigned long start;
1311 u32 len;
1312
1313 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1314 return -EINVAL;
1315 off = vma->vm_pgoff << PAGE_SHIFT;
1316 if (!fb)
1317 return -ENODEV;
1318 mutex_lock(&info->mm_lock);
1319 if (fb->fb_mmap) {
1320 int res;
1321 res = fb->fb_mmap(info, vma);
1322 mutex_unlock(&info->mm_lock);
1323 return res;
1324 }
1325
1326 /* frame buffer memory */
1327 start = info->fix.smem_start;
1328 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1329 if (off >= len) {
1330 /* memory mapped io */
1331 off -= len;
1332 if (info->var.accel_flags) {
1333 mutex_unlock(&info->mm_lock);
1334 return -EINVAL;
1335 }
1336 start = info->fix.mmio_start;
1337 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1338 }
1339 mutex_unlock(&info->mm_lock);
1340 start &= PAGE_MASK;
1341 if ((vma->vm_end - vma->vm_start + off) > len)
1342 return -EINVAL;
1343 off += start;
1344 vma->vm_pgoff = off >> PAGE_SHIFT;
1345 /* This is an IO map - tell maydump to skip this VMA */
1346 vma->vm_flags |= VM_IO | VM_RESERVED;
1347 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1348 fb_pgprotect(file, vma, off);
1349 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1350 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1351 return -EAGAIN;
1352 return 0;
1353 }
1354
1355 static int
1356 fb_open(struct inode *inode, struct file *file)
1357 __acquires(&info->lock)
1358 __releases(&info->lock)
1359 {
1360 int fbidx = iminor(inode);
1361 struct fb_info *info;
1362 int res = 0;
1363
1364 if (fbidx >= FB_MAX)
1365 return -ENODEV;
1366 info = registered_fb[fbidx];
1367 if (!info)
1368 request_module("fb%d", fbidx);
1369 info = registered_fb[fbidx];
1370 if (!info)
1371 return -ENODEV;
1372 mutex_lock(&info->lock);
1373 if (!try_module_get(info->fbops->owner)) {
1374 res = -ENODEV;
1375 goto out;
1376 }
1377 file->private_data = info;
1378 if (info->fbops->fb_open) {
1379 res = info->fbops->fb_open(info,1);
1380 if (res)
1381 module_put(info->fbops->owner);
1382 }
1383 #ifdef CONFIG_FB_DEFERRED_IO
1384 if (info->fbdefio)
1385 fb_deferred_io_open(info, inode, file);
1386 #endif
1387 out:
1388 mutex_unlock(&info->lock);
1389 return res;
1390 }
1391
1392 static int
1393 fb_release(struct inode *inode, struct file *file)
1394 __acquires(&info->lock)
1395 __releases(&info->lock)
1396 {
1397 struct fb_info * const info = file->private_data;
1398
1399 mutex_lock(&info->lock);
1400 if (info->fbops->fb_release)
1401 info->fbops->fb_release(info,1);
1402 module_put(info->fbops->owner);
1403 mutex_unlock(&info->lock);
1404 return 0;
1405 }
1406
1407 static const struct file_operations fb_fops = {
1408 .owner = THIS_MODULE,
1409 .read = fb_read,
1410 .write = fb_write,
1411 .unlocked_ioctl = fb_ioctl,
1412 #ifdef CONFIG_COMPAT
1413 .compat_ioctl = fb_compat_ioctl,
1414 #endif
1415 .mmap = fb_mmap,
1416 .open = fb_open,
1417 .release = fb_release,
1418 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1419 .get_unmapped_area = get_fb_unmapped_area,
1420 #endif
1421 #ifdef CONFIG_FB_DEFERRED_IO
1422 .fsync = fb_deferred_io_fsync,
1423 #endif
1424 .llseek = default_llseek,
1425 };
1426
1427 struct class *fb_class;
1428 EXPORT_SYMBOL(fb_class);
1429
1430 static int fb_check_foreignness(struct fb_info *fi)
1431 {
1432 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1433
1434 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1435
1436 #ifdef __BIG_ENDIAN
1437 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1438 #else
1439 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1440 #endif /* __BIG_ENDIAN */
1441
1442 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1443 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1444 "support this framebuffer\n", fi->fix.id);
1445 return -ENOSYS;
1446 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1447 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1448 "support this framebuffer\n", fi->fix.id);
1449 return -ENOSYS;
1450 }
1451
1452 return 0;
1453 }
1454
1455 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1456 {
1457 /* is the generic aperture base the same as the HW one */
1458 if (gen->base == hw->base)
1459 return true;
1460 /* is the generic aperture base inside the hw base->hw base+size */
1461 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1462 return true;
1463 return false;
1464 }
1465
1466 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1467 struct apertures_struct *hwa)
1468 {
1469 int i, j;
1470 if (!hwa || !gena)
1471 return false;
1472
1473 for (i = 0; i < hwa->count; ++i) {
1474 struct aperture *h = &hwa->ranges[i];
1475 for (j = 0; j < gena->count; ++j) {
1476 struct aperture *g = &gena->ranges[j];
1477 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1478 (unsigned long long)g->base,
1479 (unsigned long long)g->size,
1480 (unsigned long long)h->base,
1481 (unsigned long long)h->size);
1482 if (apertures_overlap(g, h))
1483 return true;
1484 }
1485 }
1486
1487 return false;
1488 }
1489
1490 #define VGA_FB_PHYS 0xA0000
1491 void remove_conflicting_framebuffers(struct apertures_struct *a,
1492 const char *name, bool primary)
1493 {
1494 int i;
1495
1496 /* check all firmware fbs and kick off if the base addr overlaps */
1497 for (i = 0 ; i < FB_MAX; i++) {
1498 struct apertures_struct *gen_aper;
1499 if (!registered_fb[i])
1500 continue;
1501
1502 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1503 continue;
1504
1505 gen_aper = registered_fb[i]->apertures;
1506 if (fb_do_apertures_overlap(gen_aper, a) ||
1507 (primary && gen_aper && gen_aper->count &&
1508 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1509
1510 printk(KERN_ERR "fb: conflicting fb hw usage "
1511 "%s vs %s - removing generic driver\n",
1512 name, registered_fb[i]->fix.id);
1513 unregister_framebuffer(registered_fb[i]);
1514 }
1515 }
1516 }
1517 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1518
1519 /**
1520 * register_framebuffer - registers a frame buffer device
1521 * @fb_info: frame buffer info structure
1522 *
1523 * Registers a frame buffer device @fb_info.
1524 *
1525 * Returns negative errno on error, or zero for success.
1526 *
1527 */
1528
1529 int
1530 register_framebuffer(struct fb_info *fb_info)
1531 {
1532 int i;
1533 struct fb_event event;
1534 struct fb_videomode mode;
1535
1536 if (num_registered_fb == FB_MAX)
1537 return -ENXIO;
1538
1539 if (fb_check_foreignness(fb_info))
1540 return -ENOSYS;
1541
1542 remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1543 fb_is_primary_device(fb_info));
1544
1545 num_registered_fb++;
1546 for (i = 0 ; i < FB_MAX; i++)
1547 if (!registered_fb[i])
1548 break;
1549 fb_info->node = i;
1550 mutex_init(&fb_info->lock);
1551 mutex_init(&fb_info->mm_lock);
1552
1553 fb_info->dev = device_create(fb_class, fb_info->device,
1554 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1555 if (IS_ERR(fb_info->dev)) {
1556 /* Not fatal */
1557 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1558 fb_info->dev = NULL;
1559 } else
1560 fb_init_device(fb_info);
1561
1562 if (fb_info->pixmap.addr == NULL) {
1563 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1564 if (fb_info->pixmap.addr) {
1565 fb_info->pixmap.size = FBPIXMAPSIZE;
1566 fb_info->pixmap.buf_align = 1;
1567 fb_info->pixmap.scan_align = 1;
1568 fb_info->pixmap.access_align = 32;
1569 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1570 }
1571 }
1572 fb_info->pixmap.offset = 0;
1573
1574 if (!fb_info->pixmap.blit_x)
1575 fb_info->pixmap.blit_x = ~(u32)0;
1576
1577 if (!fb_info->pixmap.blit_y)
1578 fb_info->pixmap.blit_y = ~(u32)0;
1579
1580 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1581 INIT_LIST_HEAD(&fb_info->modelist);
1582
1583 fb_var_to_videomode(&mode, &fb_info->var);
1584 fb_add_videomode(&mode, &fb_info->modelist);
1585 registered_fb[i] = fb_info;
1586
1587 event.info = fb_info;
1588 if (!lock_fb_info(fb_info))
1589 return -ENODEV;
1590 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1591 unlock_fb_info(fb_info);
1592 return 0;
1593 }
1594
1595
1596 /**
1597 * unregister_framebuffer - releases a frame buffer device
1598 * @fb_info: frame buffer info structure
1599 *
1600 * Unregisters a frame buffer device @fb_info.
1601 *
1602 * Returns negative errno on error, or zero for success.
1603 *
1604 * This function will also notify the framebuffer console
1605 * to release the driver.
1606 *
1607 * This is meant to be called within a driver's module_exit()
1608 * function. If this is called outside module_exit(), ensure
1609 * that the driver implements fb_open() and fb_release() to
1610 * check that no processes are using the device.
1611 */
1612
1613 int
1614 unregister_framebuffer(struct fb_info *fb_info)
1615 {
1616 struct fb_event event;
1617 int i, ret = 0;
1618
1619 i = fb_info->node;
1620 if (!registered_fb[i]) {
1621 ret = -EINVAL;
1622 goto done;
1623 }
1624
1625
1626 if (!lock_fb_info(fb_info))
1627 return -ENODEV;
1628 event.info = fb_info;
1629 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1630 unlock_fb_info(fb_info);
1631
1632 if (ret) {
1633 ret = -EINVAL;
1634 goto done;
1635 }
1636
1637 if (fb_info->pixmap.addr &&
1638 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1639 kfree(fb_info->pixmap.addr);
1640 fb_destroy_modelist(&fb_info->modelist);
1641 registered_fb[i]=NULL;
1642 num_registered_fb--;
1643 fb_cleanup_device(fb_info);
1644 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1645 event.info = fb_info;
1646 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1647
1648 /* this may free fb info */
1649 if (fb_info->fbops->fb_destroy)
1650 fb_info->fbops->fb_destroy(fb_info);
1651 done:
1652 return ret;
1653 }
1654
1655 /**
1656 * fb_set_suspend - low level driver signals suspend
1657 * @info: framebuffer affected
1658 * @state: 0 = resuming, !=0 = suspending
1659 *
1660 * This is meant to be used by low level drivers to
1661 * signal suspend/resume to the core & clients.
1662 * It must be called with the console semaphore held
1663 */
1664 void fb_set_suspend(struct fb_info *info, int state)
1665 {
1666 struct fb_event event;
1667
1668 if (!lock_fb_info(info))
1669 return;
1670 event.info = info;
1671 if (state) {
1672 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1673 info->state = FBINFO_STATE_SUSPENDED;
1674 } else {
1675 info->state = FBINFO_STATE_RUNNING;
1676 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1677 }
1678 unlock_fb_info(info);
1679 }
1680
1681 /**
1682 * fbmem_init - init frame buffer subsystem
1683 *
1684 * Initialize the frame buffer subsystem.
1685 *
1686 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1687 *
1688 */
1689
1690 static int __init
1691 fbmem_init(void)
1692 {
1693 proc_create("fb", 0, NULL, &fb_proc_fops);
1694
1695 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1696 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1697
1698 fb_class = class_create(THIS_MODULE, "graphics");
1699 if (IS_ERR(fb_class)) {
1700 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1701 fb_class = NULL;
1702 }
1703 return 0;
1704 }
1705
1706 #ifdef MODULE
1707 module_init(fbmem_init);
1708 static void __exit
1709 fbmem_exit(void)
1710 {
1711 remove_proc_entry("fb", NULL);
1712 class_destroy(fb_class);
1713 unregister_chrdev(FB_MAJOR, "fb");
1714 }
1715
1716 module_exit(fbmem_exit);
1717 MODULE_LICENSE("GPL");
1718 MODULE_DESCRIPTION("Framebuffer base");
1719 #else
1720 subsys_initcall(fbmem_init);
1721 #endif
1722
1723 int fb_new_modelist(struct fb_info *info)
1724 {
1725 struct fb_event event;
1726 struct fb_var_screeninfo var = info->var;
1727 struct list_head *pos, *n;
1728 struct fb_modelist *modelist;
1729 struct fb_videomode *m, mode;
1730 int err = 1;
1731
1732 list_for_each_safe(pos, n, &info->modelist) {
1733 modelist = list_entry(pos, struct fb_modelist, list);
1734 m = &modelist->mode;
1735 fb_videomode_to_var(&var, m);
1736 var.activate = FB_ACTIVATE_TEST;
1737 err = fb_set_var(info, &var);
1738 fb_var_to_videomode(&mode, &var);
1739 if (err || !fb_mode_is_equal(m, &mode)) {
1740 list_del(pos);
1741 kfree(pos);
1742 }
1743 }
1744
1745 err = 1;
1746
1747 if (!list_empty(&info->modelist)) {
1748 if (!lock_fb_info(info))
1749 return -ENODEV;
1750 event.info = info;
1751 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1752 unlock_fb_info(info);
1753 }
1754
1755 return err;
1756 }
1757
1758 static char *video_options[FB_MAX] __read_mostly;
1759 static int ofonly __read_mostly;
1760
1761 /**
1762 * fb_get_options - get kernel boot parameters
1763 * @name: framebuffer name as it would appear in
1764 * the boot parameter line
1765 * (video=<name>:<options>)
1766 * @option: the option will be stored here
1767 *
1768 * NOTE: Needed to maintain backwards compatibility
1769 */
1770 int fb_get_options(char *name, char **option)
1771 {
1772 char *opt, *options = NULL;
1773 int retval = 0;
1774 int name_len = strlen(name), i;
1775
1776 if (name_len && ofonly && strncmp(name, "offb", 4))
1777 retval = 1;
1778
1779 if (name_len && !retval) {
1780 for (i = 0; i < FB_MAX; i++) {
1781 if (video_options[i] == NULL)
1782 continue;
1783 if (!video_options[i][0])
1784 continue;
1785 opt = video_options[i];
1786 if (!strncmp(name, opt, name_len) &&
1787 opt[name_len] == ':')
1788 options = opt + name_len + 1;
1789 }
1790 }
1791 if (options && !strncmp(options, "off", 3))
1792 retval = 1;
1793
1794 if (option)
1795 *option = options;
1796
1797 return retval;
1798 }
1799
1800 #ifndef MODULE
1801 /**
1802 * video_setup - process command line options
1803 * @options: string of options
1804 *
1805 * Process command line options for frame buffer subsystem.
1806 *
1807 * NOTE: This function is a __setup and __init function.
1808 * It only stores the options. Drivers have to call
1809 * fb_get_options() as necessary.
1810 *
1811 * Returns zero.
1812 *
1813 */
1814 static int __init video_setup(char *options)
1815 {
1816 int i, global = 0;
1817
1818 if (!options || !*options)
1819 global = 1;
1820
1821 if (!global && !strncmp(options, "ofonly", 6)) {
1822 ofonly = 1;
1823 global = 1;
1824 }
1825
1826 if (!global && !strchr(options, ':')) {
1827 fb_mode_option = options;
1828 global = 1;
1829 }
1830
1831 if (!global) {
1832 for (i = 0; i < FB_MAX; i++) {
1833 if (video_options[i] == NULL) {
1834 video_options[i] = options;
1835 break;
1836 }
1837
1838 }
1839 }
1840
1841 return 1;
1842 }
1843 __setup("video=", video_setup);
1844 #endif
1845
1846 /*
1847 * Visible symbols for modules
1848 */
1849
1850 EXPORT_SYMBOL(register_framebuffer);
1851 EXPORT_SYMBOL(unregister_framebuffer);
1852 EXPORT_SYMBOL(num_registered_fb);
1853 EXPORT_SYMBOL(registered_fb);
1854 EXPORT_SYMBOL(fb_show_logo);
1855 EXPORT_SYMBOL(fb_set_var);
1856 EXPORT_SYMBOL(fb_blank);
1857 EXPORT_SYMBOL(fb_pan_display);
1858 EXPORT_SYMBOL(fb_get_buffer_offset);
1859 EXPORT_SYMBOL(fb_set_suspend);
1860 EXPORT_SYMBOL(fb_get_options);
1861
1862 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree