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fbdev: Debug knob to register without holding console_lock
[deliverable/linux.git] / drivers / video / fbdev / core / fbmem.c
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 static DEFINE_MUTEX(registration_lock);
46
47 struct fb_info *registered_fb[FB_MAX] __read_mostly;
48 EXPORT_SYMBOL(registered_fb);
49
50 int num_registered_fb __read_mostly;
51 EXPORT_SYMBOL(num_registered_fb);
52
53 static struct fb_info *get_fb_info(unsigned int idx)
54 {
55 struct fb_info *fb_info;
56
57 if (idx >= FB_MAX)
58 return ERR_PTR(-ENODEV);
59
60 mutex_lock(&registration_lock);
61 fb_info = registered_fb[idx];
62 if (fb_info)
63 atomic_inc(&fb_info->count);
64 mutex_unlock(&registration_lock);
65
66 return fb_info;
67 }
68
69 static void put_fb_info(struct fb_info *fb_info)
70 {
71 if (!atomic_dec_and_test(&fb_info->count))
72 return;
73 if (fb_info->fbops->fb_destroy)
74 fb_info->fbops->fb_destroy(fb_info);
75 }
76
77 int lock_fb_info(struct fb_info *info)
78 {
79 mutex_lock(&info->lock);
80 if (!info->fbops) {
81 mutex_unlock(&info->lock);
82 return 0;
83 }
84 return 1;
85 }
86 EXPORT_SYMBOL(lock_fb_info);
87
88 /*
89 * Helpers
90 */
91
92 int fb_get_color_depth(struct fb_var_screeninfo *var,
93 struct fb_fix_screeninfo *fix)
94 {
95 int depth = 0;
96
97 if (fix->visual == FB_VISUAL_MONO01 ||
98 fix->visual == FB_VISUAL_MONO10)
99 depth = 1;
100 else {
101 if (var->green.length == var->blue.length &&
102 var->green.length == var->red.length &&
103 var->green.offset == var->blue.offset &&
104 var->green.offset == var->red.offset)
105 depth = var->green.length;
106 else
107 depth = var->green.length + var->red.length +
108 var->blue.length;
109 }
110
111 return depth;
112 }
113 EXPORT_SYMBOL(fb_get_color_depth);
114
115 /*
116 * Data padding functions.
117 */
118 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
119 {
120 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
121 }
122 EXPORT_SYMBOL(fb_pad_aligned_buffer);
123
124 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
125 u32 shift_high, u32 shift_low, u32 mod)
126 {
127 u8 mask = (u8) (0xfff << shift_high), tmp;
128 int i, j;
129
130 for (i = height; i--; ) {
131 for (j = 0; j < idx; j++) {
132 tmp = dst[j];
133 tmp &= mask;
134 tmp |= *src >> shift_low;
135 dst[j] = tmp;
136 tmp = *src << shift_high;
137 dst[j+1] = tmp;
138 src++;
139 }
140 tmp = dst[idx];
141 tmp &= mask;
142 tmp |= *src >> shift_low;
143 dst[idx] = tmp;
144 if (shift_high < mod) {
145 tmp = *src << shift_high;
146 dst[idx+1] = tmp;
147 }
148 src++;
149 dst += d_pitch;
150 }
151 }
152 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
153
154 /*
155 * we need to lock this section since fb_cursor
156 * may use fb_imageblit()
157 */
158 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
159 {
160 u32 align = buf->buf_align - 1, offset;
161 char *addr = buf->addr;
162
163 /* If IO mapped, we need to sync before access, no sharing of
164 * the pixmap is done
165 */
166 if (buf->flags & FB_PIXMAP_IO) {
167 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
168 info->fbops->fb_sync(info);
169 return addr;
170 }
171
172 /* See if we fit in the remaining pixmap space */
173 offset = buf->offset + align;
174 offset &= ~align;
175 if (offset + size > buf->size) {
176 /* We do not fit. In order to be able to re-use the buffer,
177 * we must ensure no asynchronous DMA'ing or whatever operation
178 * is in progress, we sync for that.
179 */
180 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
181 info->fbops->fb_sync(info);
182 offset = 0;
183 }
184 buf->offset = offset + size;
185 addr += offset;
186
187 return addr;
188 }
189 EXPORT_SYMBOL(fb_get_buffer_offset);
190
191 #ifdef CONFIG_LOGO
192
193 static inline unsigned safe_shift(unsigned d, int n)
194 {
195 return n < 0 ? d >> -n : d << n;
196 }
197
198 static void fb_set_logocmap(struct fb_info *info,
199 const struct linux_logo *logo)
200 {
201 struct fb_cmap palette_cmap;
202 u16 palette_green[16];
203 u16 palette_blue[16];
204 u16 palette_red[16];
205 int i, j, n;
206 const unsigned char *clut = logo->clut;
207
208 palette_cmap.start = 0;
209 palette_cmap.len = 16;
210 palette_cmap.red = palette_red;
211 palette_cmap.green = palette_green;
212 palette_cmap.blue = palette_blue;
213 palette_cmap.transp = NULL;
214
215 for (i = 0; i < logo->clutsize; i += n) {
216 n = logo->clutsize - i;
217 /* palette_cmap provides space for only 16 colors at once */
218 if (n > 16)
219 n = 16;
220 palette_cmap.start = 32 + i;
221 palette_cmap.len = n;
222 for (j = 0; j < n; ++j) {
223 palette_cmap.red[j] = clut[0] << 8 | clut[0];
224 palette_cmap.green[j] = clut[1] << 8 | clut[1];
225 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
226 clut += 3;
227 }
228 fb_set_cmap(&palette_cmap, info);
229 }
230 }
231
232 static void fb_set_logo_truepalette(struct fb_info *info,
233 const struct linux_logo *logo,
234 u32 *palette)
235 {
236 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
237 unsigned char redmask, greenmask, bluemask;
238 int redshift, greenshift, blueshift;
239 int i;
240 const unsigned char *clut = logo->clut;
241
242 /*
243 * We have to create a temporary palette since console palette is only
244 * 16 colors long.
245 */
246 /* Bug: Doesn't obey msb_right ... (who needs that?) */
247 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
248 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
249 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
250 redshift = info->var.red.offset - (8 - info->var.red.length);
251 greenshift = info->var.green.offset - (8 - info->var.green.length);
252 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
253
254 for ( i = 0; i < logo->clutsize; i++) {
255 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
256 safe_shift((clut[1] & greenmask), greenshift) |
257 safe_shift((clut[2] & bluemask), blueshift));
258 clut += 3;
259 }
260 }
261
262 static void fb_set_logo_directpalette(struct fb_info *info,
263 const struct linux_logo *logo,
264 u32 *palette)
265 {
266 int redshift, greenshift, blueshift;
267 int i;
268
269 redshift = info->var.red.offset;
270 greenshift = info->var.green.offset;
271 blueshift = info->var.blue.offset;
272
273 for (i = 32; i < 32 + logo->clutsize; i++)
274 palette[i] = i << redshift | i << greenshift | i << blueshift;
275 }
276
277 static void fb_set_logo(struct fb_info *info,
278 const struct linux_logo *logo, u8 *dst,
279 int depth)
280 {
281 int i, j, k;
282 const u8 *src = logo->data;
283 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
284 u8 fg = 1, d;
285
286 switch (fb_get_color_depth(&info->var, &info->fix)) {
287 case 1:
288 fg = 1;
289 break;
290 case 2:
291 fg = 3;
292 break;
293 default:
294 fg = 7;
295 break;
296 }
297
298 if (info->fix.visual == FB_VISUAL_MONO01 ||
299 info->fix.visual == FB_VISUAL_MONO10)
300 fg = ~((u8) (0xfff << info->var.green.length));
301
302 switch (depth) {
303 case 4:
304 for (i = 0; i < logo->height; i++)
305 for (j = 0; j < logo->width; src++) {
306 *dst++ = *src >> 4;
307 j++;
308 if (j < logo->width) {
309 *dst++ = *src & 0x0f;
310 j++;
311 }
312 }
313 break;
314 case 1:
315 for (i = 0; i < logo->height; i++) {
316 for (j = 0; j < logo->width; src++) {
317 d = *src ^ xor;
318 for (k = 7; k >= 0; k--) {
319 *dst++ = ((d >> k) & 1) ? fg : 0;
320 j++;
321 }
322 }
323 }
324 break;
325 }
326 }
327
328 /*
329 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
330 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
331 * the visual format and color depth of the framebuffer, the DAC, the
332 * pseudo_palette, and the logo data will be adjusted accordingly.
333 *
334 * Case 1 - linux_logo_clut224:
335 * Color exceeds the number of console colors (16), thus we set the hardware DAC
336 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
337 *
338 * For visuals that require color info from the pseudo_palette, we also construct
339 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
340 * will be set.
341 *
342 * Case 2 - linux_logo_vga16:
343 * The number of colors just matches the console colors, thus there is no need
344 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
345 * each byte contains color information for two pixels (upper and lower nibble).
346 * To be consistent with fb_imageblit() usage, we therefore separate the two
347 * nibbles into separate bytes. The "depth" flag will be set to 4.
348 *
349 * Case 3 - linux_logo_mono:
350 * This is similar with Case 2. Each byte contains information for 8 pixels.
351 * We isolate each bit and expand each into a byte. The "depth" flag will
352 * be set to 1.
353 */
354 static struct logo_data {
355 int depth;
356 int needs_directpalette;
357 int needs_truepalette;
358 int needs_cmapreset;
359 const struct linux_logo *logo;
360 } fb_logo __read_mostly;
361
362 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
363 {
364 u32 size = width * height, i;
365
366 out += size - 1;
367
368 for (i = size; i--; )
369 *out-- = *in++;
370 }
371
372 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
373 {
374 int i, j, h = height - 1;
375
376 for (i = 0; i < height; i++)
377 for (j = 0; j < width; j++)
378 out[height * j + h - i] = *in++;
379 }
380
381 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
382 {
383 int i, j, w = width - 1;
384
385 for (i = 0; i < height; i++)
386 for (j = 0; j < width; j++)
387 out[height * (w - j) + i] = *in++;
388 }
389
390 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
391 struct fb_image *image, int rotate)
392 {
393 u32 tmp;
394
395 if (rotate == FB_ROTATE_UD) {
396 fb_rotate_logo_ud(image->data, dst, image->width,
397 image->height);
398 image->dx = info->var.xres - image->width - image->dx;
399 image->dy = info->var.yres - image->height - image->dy;
400 } else if (rotate == FB_ROTATE_CW) {
401 fb_rotate_logo_cw(image->data, dst, image->width,
402 image->height);
403 tmp = image->width;
404 image->width = image->height;
405 image->height = tmp;
406 tmp = image->dy;
407 image->dy = image->dx;
408 image->dx = info->var.xres - image->width - tmp;
409 } else if (rotate == FB_ROTATE_CCW) {
410 fb_rotate_logo_ccw(image->data, dst, image->width,
411 image->height);
412 tmp = image->width;
413 image->width = image->height;
414 image->height = tmp;
415 tmp = image->dx;
416 image->dx = image->dy;
417 image->dy = info->var.yres - image->height - tmp;
418 }
419
420 image->data = dst;
421 }
422
423 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
424 int rotate, unsigned int num)
425 {
426 unsigned int x;
427
428 if (rotate == FB_ROTATE_UR) {
429 for (x = 0;
430 x < num && image->dx + image->width <= info->var.xres;
431 x++) {
432 info->fbops->fb_imageblit(info, image);
433 image->dx += image->width + 8;
434 }
435 } else if (rotate == FB_ROTATE_UD) {
436 for (x = 0; x < num; x++) {
437 info->fbops->fb_imageblit(info, image);
438 image->dx -= image->width + 8;
439 }
440 } else if (rotate == FB_ROTATE_CW) {
441 for (x = 0;
442 x < num && image->dy + image->height <= info->var.yres;
443 x++) {
444 info->fbops->fb_imageblit(info, image);
445 image->dy += image->height + 8;
446 }
447 } else if (rotate == FB_ROTATE_CCW) {
448 for (x = 0; x < num; x++) {
449 info->fbops->fb_imageblit(info, image);
450 image->dy -= image->height + 8;
451 }
452 }
453 }
454
455 static int fb_show_logo_line(struct fb_info *info, int rotate,
456 const struct linux_logo *logo, int y,
457 unsigned int n)
458 {
459 u32 *palette = NULL, *saved_pseudo_palette = NULL;
460 unsigned char *logo_new = NULL, *logo_rotate = NULL;
461 struct fb_image image;
462
463 /* Return if the frame buffer is not mapped or suspended */
464 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
465 info->flags & FBINFO_MODULE)
466 return 0;
467
468 image.depth = 8;
469 image.data = logo->data;
470
471 if (fb_logo.needs_cmapreset)
472 fb_set_logocmap(info, logo);
473
474 if (fb_logo.needs_truepalette ||
475 fb_logo.needs_directpalette) {
476 palette = kmalloc(256 * 4, GFP_KERNEL);
477 if (palette == NULL)
478 return 0;
479
480 if (fb_logo.needs_truepalette)
481 fb_set_logo_truepalette(info, logo, palette);
482 else
483 fb_set_logo_directpalette(info, logo, palette);
484
485 saved_pseudo_palette = info->pseudo_palette;
486 info->pseudo_palette = palette;
487 }
488
489 if (fb_logo.depth <= 4) {
490 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
491 if (logo_new == NULL) {
492 kfree(palette);
493 if (saved_pseudo_palette)
494 info->pseudo_palette = saved_pseudo_palette;
495 return 0;
496 }
497 image.data = logo_new;
498 fb_set_logo(info, logo, logo_new, fb_logo.depth);
499 }
500
501 image.dx = 0;
502 image.dy = y;
503 image.width = logo->width;
504 image.height = logo->height;
505
506 if (rotate) {
507 logo_rotate = kmalloc(logo->width *
508 logo->height, GFP_KERNEL);
509 if (logo_rotate)
510 fb_rotate_logo(info, logo_rotate, &image, rotate);
511 }
512
513 fb_do_show_logo(info, &image, rotate, n);
514
515 kfree(palette);
516 if (saved_pseudo_palette != NULL)
517 info->pseudo_palette = saved_pseudo_palette;
518 kfree(logo_new);
519 kfree(logo_rotate);
520 return logo->height;
521 }
522
523
524 #ifdef CONFIG_FB_LOGO_EXTRA
525
526 #define FB_LOGO_EX_NUM_MAX 10
527 static struct logo_data_extra {
528 const struct linux_logo *logo;
529 unsigned int n;
530 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
531 static unsigned int fb_logo_ex_num;
532
533 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
534 {
535 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
536 return;
537
538 fb_logo_ex[fb_logo_ex_num].logo = logo;
539 fb_logo_ex[fb_logo_ex_num].n = n;
540 fb_logo_ex_num++;
541 }
542
543 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
544 unsigned int yres)
545 {
546 unsigned int i;
547
548 /* FIXME: logo_ex supports only truecolor fb. */
549 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
550 fb_logo_ex_num = 0;
551
552 for (i = 0; i < fb_logo_ex_num; i++) {
553 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
554 fb_logo_ex[i].logo = NULL;
555 continue;
556 }
557 height += fb_logo_ex[i].logo->height;
558 if (height > yres) {
559 height -= fb_logo_ex[i].logo->height;
560 fb_logo_ex_num = i;
561 break;
562 }
563 }
564 return height;
565 }
566
567 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
568 {
569 unsigned int i;
570
571 for (i = 0; i < fb_logo_ex_num; i++)
572 y += fb_show_logo_line(info, rotate,
573 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
574
575 return y;
576 }
577
578 #else /* !CONFIG_FB_LOGO_EXTRA */
579
580 static inline int fb_prepare_extra_logos(struct fb_info *info,
581 unsigned int height,
582 unsigned int yres)
583 {
584 return height;
585 }
586
587 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
588 {
589 return y;
590 }
591
592 #endif /* CONFIG_FB_LOGO_EXTRA */
593
594
595 int fb_prepare_logo(struct fb_info *info, int rotate)
596 {
597 int depth = fb_get_color_depth(&info->var, &info->fix);
598 unsigned int yres;
599
600 memset(&fb_logo, 0, sizeof(struct logo_data));
601
602 if (info->flags & FBINFO_MISC_TILEBLITTING ||
603 info->flags & FBINFO_MODULE)
604 return 0;
605
606 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
607 depth = info->var.blue.length;
608 if (info->var.red.length < depth)
609 depth = info->var.red.length;
610 if (info->var.green.length < depth)
611 depth = info->var.green.length;
612 }
613
614 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
615 /* assume console colormap */
616 depth = 4;
617 }
618
619 /* Return if no suitable logo was found */
620 fb_logo.logo = fb_find_logo(depth);
621
622 if (!fb_logo.logo) {
623 return 0;
624 }
625
626 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
627 yres = info->var.yres;
628 else
629 yres = info->var.xres;
630
631 if (fb_logo.logo->height > yres) {
632 fb_logo.logo = NULL;
633 return 0;
634 }
635
636 /* What depth we asked for might be different from what we get */
637 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
638 fb_logo.depth = 8;
639 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
640 fb_logo.depth = 4;
641 else
642 fb_logo.depth = 1;
643
644
645 if (fb_logo.depth > 4 && depth > 4) {
646 switch (info->fix.visual) {
647 case FB_VISUAL_TRUECOLOR:
648 fb_logo.needs_truepalette = 1;
649 break;
650 case FB_VISUAL_DIRECTCOLOR:
651 fb_logo.needs_directpalette = 1;
652 fb_logo.needs_cmapreset = 1;
653 break;
654 case FB_VISUAL_PSEUDOCOLOR:
655 fb_logo.needs_cmapreset = 1;
656 break;
657 }
658 }
659
660 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
661 }
662
663 int fb_show_logo(struct fb_info *info, int rotate)
664 {
665 int y;
666
667 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
668 num_online_cpus());
669 y = fb_show_extra_logos(info, y, rotate);
670
671 return y;
672 }
673 #else
674 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
675 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
676 #endif /* CONFIG_LOGO */
677 EXPORT_SYMBOL(fb_prepare_logo);
678 EXPORT_SYMBOL(fb_show_logo);
679
680 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
681 {
682 mutex_lock(&registration_lock);
683 return (*pos < FB_MAX) ? pos : NULL;
684 }
685
686 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
687 {
688 (*pos)++;
689 return (*pos < FB_MAX) ? pos : NULL;
690 }
691
692 static void fb_seq_stop(struct seq_file *m, void *v)
693 {
694 mutex_unlock(&registration_lock);
695 }
696
697 static int fb_seq_show(struct seq_file *m, void *v)
698 {
699 int i = *(loff_t *)v;
700 struct fb_info *fi = registered_fb[i];
701
702 if (fi)
703 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
704 return 0;
705 }
706
707 static const struct seq_operations proc_fb_seq_ops = {
708 .start = fb_seq_start,
709 .next = fb_seq_next,
710 .stop = fb_seq_stop,
711 .show = fb_seq_show,
712 };
713
714 static int proc_fb_open(struct inode *inode, struct file *file)
715 {
716 return seq_open(file, &proc_fb_seq_ops);
717 }
718
719 static const struct file_operations fb_proc_fops = {
720 .owner = THIS_MODULE,
721 .open = proc_fb_open,
722 .read = seq_read,
723 .llseek = seq_lseek,
724 .release = seq_release,
725 };
726
727 /*
728 * We hold a reference to the fb_info in file->private_data,
729 * but if the current registered fb has changed, we don't
730 * actually want to use it.
731 *
732 * So look up the fb_info using the inode minor number,
733 * and just verify it against the reference we have.
734 */
735 static struct fb_info *file_fb_info(struct file *file)
736 {
737 struct inode *inode = file_inode(file);
738 int fbidx = iminor(inode);
739 struct fb_info *info = registered_fb[fbidx];
740
741 if (info != file->private_data)
742 info = NULL;
743 return info;
744 }
745
746 static ssize_t
747 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
748 {
749 unsigned long p = *ppos;
750 struct fb_info *info = file_fb_info(file);
751 u8 *buffer, *dst;
752 u8 __iomem *src;
753 int c, cnt = 0, err = 0;
754 unsigned long total_size;
755
756 if (!info || ! info->screen_base)
757 return -ENODEV;
758
759 if (info->state != FBINFO_STATE_RUNNING)
760 return -EPERM;
761
762 if (info->fbops->fb_read)
763 return info->fbops->fb_read(info, buf, count, ppos);
764
765 total_size = info->screen_size;
766
767 if (total_size == 0)
768 total_size = info->fix.smem_len;
769
770 if (p >= total_size)
771 return 0;
772
773 if (count >= total_size)
774 count = total_size;
775
776 if (count + p > total_size)
777 count = total_size - p;
778
779 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
780 GFP_KERNEL);
781 if (!buffer)
782 return -ENOMEM;
783
784 src = (u8 __iomem *) (info->screen_base + p);
785
786 if (info->fbops->fb_sync)
787 info->fbops->fb_sync(info);
788
789 while (count) {
790 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
791 dst = buffer;
792 fb_memcpy_fromfb(dst, src, c);
793 dst += c;
794 src += c;
795
796 if (copy_to_user(buf, buffer, c)) {
797 err = -EFAULT;
798 break;
799 }
800 *ppos += c;
801 buf += c;
802 cnt += c;
803 count -= c;
804 }
805
806 kfree(buffer);
807
808 return (err) ? err : cnt;
809 }
810
811 static ssize_t
812 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
813 {
814 unsigned long p = *ppos;
815 struct fb_info *info = file_fb_info(file);
816 u8 *buffer, *src;
817 u8 __iomem *dst;
818 int c, cnt = 0, err = 0;
819 unsigned long total_size;
820
821 if (!info || !info->screen_base)
822 return -ENODEV;
823
824 if (info->state != FBINFO_STATE_RUNNING)
825 return -EPERM;
826
827 if (info->fbops->fb_write)
828 return info->fbops->fb_write(info, buf, count, ppos);
829
830 total_size = info->screen_size;
831
832 if (total_size == 0)
833 total_size = info->fix.smem_len;
834
835 if (p > total_size)
836 return -EFBIG;
837
838 if (count > total_size) {
839 err = -EFBIG;
840 count = total_size;
841 }
842
843 if (count + p > total_size) {
844 if (!err)
845 err = -ENOSPC;
846
847 count = total_size - p;
848 }
849
850 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
851 GFP_KERNEL);
852 if (!buffer)
853 return -ENOMEM;
854
855 dst = (u8 __iomem *) (info->screen_base + p);
856
857 if (info->fbops->fb_sync)
858 info->fbops->fb_sync(info);
859
860 while (count) {
861 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
862 src = buffer;
863
864 if (copy_from_user(src, buf, c)) {
865 err = -EFAULT;
866 break;
867 }
868
869 fb_memcpy_tofb(dst, src, c);
870 dst += c;
871 src += c;
872 *ppos += c;
873 buf += c;
874 cnt += c;
875 count -= c;
876 }
877
878 kfree(buffer);
879
880 return (cnt) ? cnt : err;
881 }
882
883 int
884 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
885 {
886 struct fb_fix_screeninfo *fix = &info->fix;
887 unsigned int yres = info->var.yres;
888 int err = 0;
889
890 if (var->yoffset > 0) {
891 if (var->vmode & FB_VMODE_YWRAP) {
892 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
893 err = -EINVAL;
894 else
895 yres = 0;
896 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
897 err = -EINVAL;
898 }
899
900 if (var->xoffset > 0 && (!fix->xpanstep ||
901 (var->xoffset % fix->xpanstep)))
902 err = -EINVAL;
903
904 if (err || !info->fbops->fb_pan_display ||
905 var->yoffset > info->var.yres_virtual - yres ||
906 var->xoffset > info->var.xres_virtual - info->var.xres)
907 return -EINVAL;
908
909 if ((err = info->fbops->fb_pan_display(var, info)))
910 return err;
911 info->var.xoffset = var->xoffset;
912 info->var.yoffset = var->yoffset;
913 if (var->vmode & FB_VMODE_YWRAP)
914 info->var.vmode |= FB_VMODE_YWRAP;
915 else
916 info->var.vmode &= ~FB_VMODE_YWRAP;
917 return 0;
918 }
919 EXPORT_SYMBOL(fb_pan_display);
920
921 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
922 u32 activate)
923 {
924 struct fb_event event;
925 struct fb_blit_caps caps, fbcaps;
926 int err = 0;
927
928 memset(&caps, 0, sizeof(caps));
929 memset(&fbcaps, 0, sizeof(fbcaps));
930 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
931 event.info = info;
932 event.data = &caps;
933 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
934 info->fbops->fb_get_caps(info, &fbcaps, var);
935
936 if (((fbcaps.x ^ caps.x) & caps.x) ||
937 ((fbcaps.y ^ caps.y) & caps.y) ||
938 (fbcaps.len < caps.len))
939 err = -EINVAL;
940
941 return err;
942 }
943
944 int
945 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
946 {
947 int flags = info->flags;
948 int ret = 0;
949
950 if (var->activate & FB_ACTIVATE_INV_MODE) {
951 struct fb_videomode mode1, mode2;
952
953 fb_var_to_videomode(&mode1, var);
954 fb_var_to_videomode(&mode2, &info->var);
955 /* make sure we don't delete the videomode of current var */
956 ret = fb_mode_is_equal(&mode1, &mode2);
957
958 if (!ret) {
959 struct fb_event event;
960
961 event.info = info;
962 event.data = &mode1;
963 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
964 }
965
966 if (!ret)
967 fb_delete_videomode(&mode1, &info->modelist);
968
969
970 ret = (ret) ? -EINVAL : 0;
971 goto done;
972 }
973
974 if ((var->activate & FB_ACTIVATE_FORCE) ||
975 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
976 u32 activate = var->activate;
977
978 /* When using FOURCC mode, make sure the red, green, blue and
979 * transp fields are set to 0.
980 */
981 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
982 var->grayscale > 1) {
983 if (var->red.offset || var->green.offset ||
984 var->blue.offset || var->transp.offset ||
985 var->red.length || var->green.length ||
986 var->blue.length || var->transp.length ||
987 var->red.msb_right || var->green.msb_right ||
988 var->blue.msb_right || var->transp.msb_right)
989 return -EINVAL;
990 }
991
992 if (!info->fbops->fb_check_var) {
993 *var = info->var;
994 goto done;
995 }
996
997 ret = info->fbops->fb_check_var(var, info);
998
999 if (ret)
1000 goto done;
1001
1002 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1003 struct fb_var_screeninfo old_var;
1004 struct fb_videomode mode;
1005
1006 if (info->fbops->fb_get_caps) {
1007 ret = fb_check_caps(info, var, activate);
1008
1009 if (ret)
1010 goto done;
1011 }
1012
1013 old_var = info->var;
1014 info->var = *var;
1015
1016 if (info->fbops->fb_set_par) {
1017 ret = info->fbops->fb_set_par(info);
1018
1019 if (ret) {
1020 info->var = old_var;
1021 printk(KERN_WARNING "detected "
1022 "fb_set_par error, "
1023 "error code: %d\n", ret);
1024 goto done;
1025 }
1026 }
1027
1028 fb_pan_display(info, &info->var);
1029 fb_set_cmap(&info->cmap, info);
1030 fb_var_to_videomode(&mode, &info->var);
1031
1032 if (info->modelist.prev && info->modelist.next &&
1033 !list_empty(&info->modelist))
1034 ret = fb_add_videomode(&mode, &info->modelist);
1035
1036 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1037 struct fb_event event;
1038 int evnt = (activate & FB_ACTIVATE_ALL) ?
1039 FB_EVENT_MODE_CHANGE_ALL :
1040 FB_EVENT_MODE_CHANGE;
1041
1042 info->flags &= ~FBINFO_MISC_USEREVENT;
1043 event.info = info;
1044 event.data = &mode;
1045 fb_notifier_call_chain(evnt, &event);
1046 }
1047 }
1048 }
1049
1050 done:
1051 return ret;
1052 }
1053 EXPORT_SYMBOL(fb_set_var);
1054
1055 int
1056 fb_blank(struct fb_info *info, int blank)
1057 {
1058 struct fb_event event;
1059 int ret = -EINVAL, early_ret;
1060
1061 if (blank > FB_BLANK_POWERDOWN)
1062 blank = FB_BLANK_POWERDOWN;
1063
1064 event.info = info;
1065 event.data = &blank;
1066
1067 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1068
1069 if (info->fbops->fb_blank)
1070 ret = info->fbops->fb_blank(blank, info);
1071
1072 if (!ret)
1073 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1074 else {
1075 /*
1076 * if fb_blank is failed then revert effects of
1077 * the early blank event.
1078 */
1079 if (!early_ret)
1080 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1081 }
1082
1083 return ret;
1084 }
1085 EXPORT_SYMBOL(fb_blank);
1086
1087 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1088 unsigned long arg)
1089 {
1090 struct fb_ops *fb;
1091 struct fb_var_screeninfo var;
1092 struct fb_fix_screeninfo fix;
1093 struct fb_con2fbmap con2fb;
1094 struct fb_cmap cmap_from;
1095 struct fb_cmap_user cmap;
1096 struct fb_event event;
1097 void __user *argp = (void __user *)arg;
1098 long ret = 0;
1099
1100 switch (cmd) {
1101 case FBIOGET_VSCREENINFO:
1102 if (!lock_fb_info(info))
1103 return -ENODEV;
1104 var = info->var;
1105 unlock_fb_info(info);
1106
1107 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1108 break;
1109 case FBIOPUT_VSCREENINFO:
1110 if (copy_from_user(&var, argp, sizeof(var)))
1111 return -EFAULT;
1112 console_lock();
1113 if (!lock_fb_info(info)) {
1114 console_unlock();
1115 return -ENODEV;
1116 }
1117 info->flags |= FBINFO_MISC_USEREVENT;
1118 ret = fb_set_var(info, &var);
1119 info->flags &= ~FBINFO_MISC_USEREVENT;
1120 unlock_fb_info(info);
1121 console_unlock();
1122 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1123 ret = -EFAULT;
1124 break;
1125 case FBIOGET_FSCREENINFO:
1126 if (!lock_fb_info(info))
1127 return -ENODEV;
1128 fix = info->fix;
1129 unlock_fb_info(info);
1130
1131 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1132 break;
1133 case FBIOPUTCMAP:
1134 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1135 return -EFAULT;
1136 ret = fb_set_user_cmap(&cmap, info);
1137 break;
1138 case FBIOGETCMAP:
1139 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1140 return -EFAULT;
1141 if (!lock_fb_info(info))
1142 return -ENODEV;
1143 cmap_from = info->cmap;
1144 unlock_fb_info(info);
1145 ret = fb_cmap_to_user(&cmap_from, &cmap);
1146 break;
1147 case FBIOPAN_DISPLAY:
1148 if (copy_from_user(&var, argp, sizeof(var)))
1149 return -EFAULT;
1150 console_lock();
1151 if (!lock_fb_info(info)) {
1152 console_unlock();
1153 return -ENODEV;
1154 }
1155 ret = fb_pan_display(info, &var);
1156 unlock_fb_info(info);
1157 console_unlock();
1158 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1159 return -EFAULT;
1160 break;
1161 case FBIO_CURSOR:
1162 ret = -EINVAL;
1163 break;
1164 case FBIOGET_CON2FBMAP:
1165 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1166 return -EFAULT;
1167 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1168 return -EINVAL;
1169 con2fb.framebuffer = -1;
1170 event.data = &con2fb;
1171 if (!lock_fb_info(info))
1172 return -ENODEV;
1173 event.info = info;
1174 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1175 unlock_fb_info(info);
1176 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1177 break;
1178 case FBIOPUT_CON2FBMAP:
1179 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1180 return -EFAULT;
1181 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1182 return -EINVAL;
1183 if (con2fb.framebuffer >= FB_MAX)
1184 return -EINVAL;
1185 if (!registered_fb[con2fb.framebuffer])
1186 request_module("fb%d", con2fb.framebuffer);
1187 if (!registered_fb[con2fb.framebuffer]) {
1188 ret = -EINVAL;
1189 break;
1190 }
1191 event.data = &con2fb;
1192 console_lock();
1193 if (!lock_fb_info(info)) {
1194 console_unlock();
1195 return -ENODEV;
1196 }
1197 event.info = info;
1198 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1199 unlock_fb_info(info);
1200 console_unlock();
1201 break;
1202 case FBIOBLANK:
1203 console_lock();
1204 if (!lock_fb_info(info)) {
1205 console_unlock();
1206 return -ENODEV;
1207 }
1208 info->flags |= FBINFO_MISC_USEREVENT;
1209 ret = fb_blank(info, arg);
1210 info->flags &= ~FBINFO_MISC_USEREVENT;
1211 unlock_fb_info(info);
1212 console_unlock();
1213 break;
1214 default:
1215 if (!lock_fb_info(info))
1216 return -ENODEV;
1217 fb = info->fbops;
1218 if (fb->fb_ioctl)
1219 ret = fb->fb_ioctl(info, cmd, arg);
1220 else
1221 ret = -ENOTTY;
1222 unlock_fb_info(info);
1223 }
1224 return ret;
1225 }
1226
1227 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1228 {
1229 struct fb_info *info = file_fb_info(file);
1230
1231 if (!info)
1232 return -ENODEV;
1233 return do_fb_ioctl(info, cmd, arg);
1234 }
1235
1236 #ifdef CONFIG_COMPAT
1237 struct fb_fix_screeninfo32 {
1238 char id[16];
1239 compat_caddr_t smem_start;
1240 u32 smem_len;
1241 u32 type;
1242 u32 type_aux;
1243 u32 visual;
1244 u16 xpanstep;
1245 u16 ypanstep;
1246 u16 ywrapstep;
1247 u32 line_length;
1248 compat_caddr_t mmio_start;
1249 u32 mmio_len;
1250 u32 accel;
1251 u16 reserved[3];
1252 };
1253
1254 struct fb_cmap32 {
1255 u32 start;
1256 u32 len;
1257 compat_caddr_t red;
1258 compat_caddr_t green;
1259 compat_caddr_t blue;
1260 compat_caddr_t transp;
1261 };
1262
1263 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1264 unsigned long arg)
1265 {
1266 struct fb_cmap_user __user *cmap;
1267 struct fb_cmap32 __user *cmap32;
1268 __u32 data;
1269 int err;
1270
1271 cmap = compat_alloc_user_space(sizeof(*cmap));
1272 cmap32 = compat_ptr(arg);
1273
1274 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1275 return -EFAULT;
1276
1277 if (get_user(data, &cmap32->red) ||
1278 put_user(compat_ptr(data), &cmap->red) ||
1279 get_user(data, &cmap32->green) ||
1280 put_user(compat_ptr(data), &cmap->green) ||
1281 get_user(data, &cmap32->blue) ||
1282 put_user(compat_ptr(data), &cmap->blue) ||
1283 get_user(data, &cmap32->transp) ||
1284 put_user(compat_ptr(data), &cmap->transp))
1285 return -EFAULT;
1286
1287 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1288
1289 if (!err) {
1290 if (copy_in_user(&cmap32->start,
1291 &cmap->start,
1292 2 * sizeof(__u32)))
1293 err = -EFAULT;
1294 }
1295 return err;
1296 }
1297
1298 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1299 struct fb_fix_screeninfo32 __user *fix32)
1300 {
1301 __u32 data;
1302 int err;
1303
1304 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1305
1306 data = (__u32) (unsigned long) fix->smem_start;
1307 err |= put_user(data, &fix32->smem_start);
1308
1309 err |= put_user(fix->smem_len, &fix32->smem_len);
1310 err |= put_user(fix->type, &fix32->type);
1311 err |= put_user(fix->type_aux, &fix32->type_aux);
1312 err |= put_user(fix->visual, &fix32->visual);
1313 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1314 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1315 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1316 err |= put_user(fix->line_length, &fix32->line_length);
1317
1318 data = (__u32) (unsigned long) fix->mmio_start;
1319 err |= put_user(data, &fix32->mmio_start);
1320
1321 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1322 err |= put_user(fix->accel, &fix32->accel);
1323 err |= copy_to_user(fix32->reserved, fix->reserved,
1324 sizeof(fix->reserved));
1325
1326 if (err)
1327 return -EFAULT;
1328 return 0;
1329 }
1330
1331 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1332 unsigned long arg)
1333 {
1334 mm_segment_t old_fs;
1335 struct fb_fix_screeninfo fix;
1336 struct fb_fix_screeninfo32 __user *fix32;
1337 int err;
1338
1339 fix32 = compat_ptr(arg);
1340
1341 old_fs = get_fs();
1342 set_fs(KERNEL_DS);
1343 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1344 set_fs(old_fs);
1345
1346 if (!err)
1347 err = do_fscreeninfo_to_user(&fix, fix32);
1348
1349 return err;
1350 }
1351
1352 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1353 unsigned long arg)
1354 {
1355 struct fb_info *info = file_fb_info(file);
1356 struct fb_ops *fb;
1357 long ret = -ENOIOCTLCMD;
1358
1359 if (!info)
1360 return -ENODEV;
1361 fb = info->fbops;
1362 switch(cmd) {
1363 case FBIOGET_VSCREENINFO:
1364 case FBIOPUT_VSCREENINFO:
1365 case FBIOPAN_DISPLAY:
1366 case FBIOGET_CON2FBMAP:
1367 case FBIOPUT_CON2FBMAP:
1368 arg = (unsigned long) compat_ptr(arg);
1369 case FBIOBLANK:
1370 ret = do_fb_ioctl(info, cmd, arg);
1371 break;
1372
1373 case FBIOGET_FSCREENINFO:
1374 ret = fb_get_fscreeninfo(info, cmd, arg);
1375 break;
1376
1377 case FBIOGETCMAP:
1378 case FBIOPUTCMAP:
1379 ret = fb_getput_cmap(info, cmd, arg);
1380 break;
1381
1382 default:
1383 if (fb->fb_compat_ioctl)
1384 ret = fb->fb_compat_ioctl(info, cmd, arg);
1385 break;
1386 }
1387 return ret;
1388 }
1389 #endif
1390
1391 static int
1392 fb_mmap(struct file *file, struct vm_area_struct * vma)
1393 {
1394 struct fb_info *info = file_fb_info(file);
1395 struct fb_ops *fb;
1396 unsigned long mmio_pgoff;
1397 unsigned long start;
1398 u32 len;
1399
1400 if (!info)
1401 return -ENODEV;
1402 fb = info->fbops;
1403 if (!fb)
1404 return -ENODEV;
1405 mutex_lock(&info->mm_lock);
1406 if (fb->fb_mmap) {
1407 int res;
1408 res = fb->fb_mmap(info, vma);
1409 mutex_unlock(&info->mm_lock);
1410 return res;
1411 }
1412
1413 /*
1414 * Ugh. This can be either the frame buffer mapping, or
1415 * if pgoff points past it, the mmio mapping.
1416 */
1417 start = info->fix.smem_start;
1418 len = info->fix.smem_len;
1419 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1420 if (vma->vm_pgoff >= mmio_pgoff) {
1421 if (info->var.accel_flags) {
1422 mutex_unlock(&info->mm_lock);
1423 return -EINVAL;
1424 }
1425
1426 vma->vm_pgoff -= mmio_pgoff;
1427 start = info->fix.mmio_start;
1428 len = info->fix.mmio_len;
1429 }
1430 mutex_unlock(&info->mm_lock);
1431
1432 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1433 fb_pgprotect(file, vma, start);
1434
1435 return vm_iomap_memory(vma, start, len);
1436 }
1437
1438 static int
1439 fb_open(struct inode *inode, struct file *file)
1440 __acquires(&info->lock)
1441 __releases(&info->lock)
1442 {
1443 int fbidx = iminor(inode);
1444 struct fb_info *info;
1445 int res = 0;
1446
1447 info = get_fb_info(fbidx);
1448 if (!info) {
1449 request_module("fb%d", fbidx);
1450 info = get_fb_info(fbidx);
1451 if (!info)
1452 return -ENODEV;
1453 }
1454 if (IS_ERR(info))
1455 return PTR_ERR(info);
1456
1457 mutex_lock(&info->lock);
1458 if (!try_module_get(info->fbops->owner)) {
1459 res = -ENODEV;
1460 goto out;
1461 }
1462 file->private_data = info;
1463 if (info->fbops->fb_open) {
1464 res = info->fbops->fb_open(info,1);
1465 if (res)
1466 module_put(info->fbops->owner);
1467 }
1468 #ifdef CONFIG_FB_DEFERRED_IO
1469 if (info->fbdefio)
1470 fb_deferred_io_open(info, inode, file);
1471 #endif
1472 out:
1473 mutex_unlock(&info->lock);
1474 if (res)
1475 put_fb_info(info);
1476 return res;
1477 }
1478
1479 static int
1480 fb_release(struct inode *inode, struct file *file)
1481 __acquires(&info->lock)
1482 __releases(&info->lock)
1483 {
1484 struct fb_info * const info = file->private_data;
1485
1486 mutex_lock(&info->lock);
1487 if (info->fbops->fb_release)
1488 info->fbops->fb_release(info,1);
1489 module_put(info->fbops->owner);
1490 mutex_unlock(&info->lock);
1491 put_fb_info(info);
1492 return 0;
1493 }
1494
1495 static const struct file_operations fb_fops = {
1496 .owner = THIS_MODULE,
1497 .read = fb_read,
1498 .write = fb_write,
1499 .unlocked_ioctl = fb_ioctl,
1500 #ifdef CONFIG_COMPAT
1501 .compat_ioctl = fb_compat_ioctl,
1502 #endif
1503 .mmap = fb_mmap,
1504 .open = fb_open,
1505 .release = fb_release,
1506 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1507 .get_unmapped_area = get_fb_unmapped_area,
1508 #endif
1509 #ifdef CONFIG_FB_DEFERRED_IO
1510 .fsync = fb_deferred_io_fsync,
1511 #endif
1512 .llseek = default_llseek,
1513 };
1514
1515 struct class *fb_class;
1516 EXPORT_SYMBOL(fb_class);
1517
1518 static int fb_check_foreignness(struct fb_info *fi)
1519 {
1520 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1521
1522 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1523
1524 #ifdef __BIG_ENDIAN
1525 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1526 #else
1527 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1528 #endif /* __BIG_ENDIAN */
1529
1530 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1531 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1532 "support this framebuffer\n", fi->fix.id);
1533 return -ENOSYS;
1534 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1535 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1536 "support this framebuffer\n", fi->fix.id);
1537 return -ENOSYS;
1538 }
1539
1540 return 0;
1541 }
1542
1543 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1544 {
1545 /* is the generic aperture base the same as the HW one */
1546 if (gen->base == hw->base)
1547 return true;
1548 /* is the generic aperture base inside the hw base->hw base+size */
1549 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1550 return true;
1551 return false;
1552 }
1553
1554 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1555 struct apertures_struct *hwa)
1556 {
1557 int i, j;
1558 if (!hwa || !gena)
1559 return false;
1560
1561 for (i = 0; i < hwa->count; ++i) {
1562 struct aperture *h = &hwa->ranges[i];
1563 for (j = 0; j < gena->count; ++j) {
1564 struct aperture *g = &gena->ranges[j];
1565 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1566 (unsigned long long)g->base,
1567 (unsigned long long)g->size,
1568 (unsigned long long)h->base,
1569 (unsigned long long)h->size);
1570 if (apertures_overlap(g, h))
1571 return true;
1572 }
1573 }
1574
1575 return false;
1576 }
1577
1578 static int do_unregister_framebuffer(struct fb_info *fb_info);
1579
1580 #define VGA_FB_PHYS 0xA0000
1581 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1582 const char *name, bool primary)
1583 {
1584 int i, ret;
1585
1586 /* check all firmware fbs and kick off if the base addr overlaps */
1587 for (i = 0 ; i < FB_MAX; i++) {
1588 struct apertures_struct *gen_aper;
1589 if (!registered_fb[i])
1590 continue;
1591
1592 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1593 continue;
1594
1595 gen_aper = registered_fb[i]->apertures;
1596 if (fb_do_apertures_overlap(gen_aper, a) ||
1597 (primary && gen_aper && gen_aper->count &&
1598 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1599
1600 printk(KERN_INFO "fb: switching to %s from %s\n",
1601 name, registered_fb[i]->fix.id);
1602 ret = do_unregister_framebuffer(registered_fb[i]);
1603 if (ret)
1604 return ret;
1605 }
1606 }
1607
1608 return 0;
1609 }
1610
1611 static bool lockless_register_fb;
1612 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1613 MODULE_PARM_DESC(lockless_register_fb,
1614 "Lockless framebuffer registration for debugging [default=off]");
1615
1616 static int do_register_framebuffer(struct fb_info *fb_info)
1617 {
1618 int i, ret;
1619 struct fb_event event;
1620 struct fb_videomode mode;
1621
1622 if (fb_check_foreignness(fb_info))
1623 return -ENOSYS;
1624
1625 ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1626 fb_info->fix.id,
1627 fb_is_primary_device(fb_info));
1628 if (ret)
1629 return ret;
1630
1631 if (num_registered_fb == FB_MAX)
1632 return -ENXIO;
1633
1634 num_registered_fb++;
1635 for (i = 0 ; i < FB_MAX; i++)
1636 if (!registered_fb[i])
1637 break;
1638 fb_info->node = i;
1639 atomic_set(&fb_info->count, 1);
1640 mutex_init(&fb_info->lock);
1641 mutex_init(&fb_info->mm_lock);
1642
1643 fb_info->dev = device_create(fb_class, fb_info->device,
1644 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1645 if (IS_ERR(fb_info->dev)) {
1646 /* Not fatal */
1647 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1648 fb_info->dev = NULL;
1649 } else
1650 fb_init_device(fb_info);
1651
1652 if (fb_info->pixmap.addr == NULL) {
1653 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1654 if (fb_info->pixmap.addr) {
1655 fb_info->pixmap.size = FBPIXMAPSIZE;
1656 fb_info->pixmap.buf_align = 1;
1657 fb_info->pixmap.scan_align = 1;
1658 fb_info->pixmap.access_align = 32;
1659 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1660 }
1661 }
1662 fb_info->pixmap.offset = 0;
1663
1664 if (!fb_info->pixmap.blit_x)
1665 fb_info->pixmap.blit_x = ~(u32)0;
1666
1667 if (!fb_info->pixmap.blit_y)
1668 fb_info->pixmap.blit_y = ~(u32)0;
1669
1670 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1671 INIT_LIST_HEAD(&fb_info->modelist);
1672
1673 if (fb_info->skip_vt_switch)
1674 pm_vt_switch_required(fb_info->dev, false);
1675 else
1676 pm_vt_switch_required(fb_info->dev, true);
1677
1678 fb_var_to_videomode(&mode, &fb_info->var);
1679 fb_add_videomode(&mode, &fb_info->modelist);
1680 registered_fb[i] = fb_info;
1681
1682 event.info = fb_info;
1683 if (!lockless_register_fb)
1684 console_lock();
1685 if (!lock_fb_info(fb_info)) {
1686 if (!lockless_register_fb)
1687 console_unlock();
1688 return -ENODEV;
1689 }
1690
1691 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1692 unlock_fb_info(fb_info);
1693 if (!lockless_register_fb)
1694 console_unlock();
1695 return 0;
1696 }
1697
1698 static int do_unregister_framebuffer(struct fb_info *fb_info)
1699 {
1700 struct fb_event event;
1701 int i, ret = 0;
1702
1703 i = fb_info->node;
1704 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1705 return -EINVAL;
1706
1707 console_lock();
1708 if (!lock_fb_info(fb_info)) {
1709 console_unlock();
1710 return -ENODEV;
1711 }
1712
1713 event.info = fb_info;
1714 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1715 unlock_fb_info(fb_info);
1716 console_unlock();
1717
1718 if (ret)
1719 return -EINVAL;
1720
1721 pm_vt_switch_unregister(fb_info->dev);
1722
1723 unlink_framebuffer(fb_info);
1724 if (fb_info->pixmap.addr &&
1725 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1726 kfree(fb_info->pixmap.addr);
1727 fb_destroy_modelist(&fb_info->modelist);
1728 registered_fb[i] = NULL;
1729 num_registered_fb--;
1730 fb_cleanup_device(fb_info);
1731 event.info = fb_info;
1732 console_lock();
1733 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1734 console_unlock();
1735
1736 /* this may free fb info */
1737 put_fb_info(fb_info);
1738 return 0;
1739 }
1740
1741 int unlink_framebuffer(struct fb_info *fb_info)
1742 {
1743 int i;
1744
1745 i = fb_info->node;
1746 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1747 return -EINVAL;
1748
1749 if (fb_info->dev) {
1750 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1751 fb_info->dev = NULL;
1752 }
1753 return 0;
1754 }
1755 EXPORT_SYMBOL(unlink_framebuffer);
1756
1757 int remove_conflicting_framebuffers(struct apertures_struct *a,
1758 const char *name, bool primary)
1759 {
1760 int ret;
1761
1762 mutex_lock(&registration_lock);
1763 ret = do_remove_conflicting_framebuffers(a, name, primary);
1764 mutex_unlock(&registration_lock);
1765
1766 return ret;
1767 }
1768 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1769
1770 /**
1771 * register_framebuffer - registers a frame buffer device
1772 * @fb_info: frame buffer info structure
1773 *
1774 * Registers a frame buffer device @fb_info.
1775 *
1776 * Returns negative errno on error, or zero for success.
1777 *
1778 */
1779 int
1780 register_framebuffer(struct fb_info *fb_info)
1781 {
1782 int ret;
1783
1784 mutex_lock(&registration_lock);
1785 ret = do_register_framebuffer(fb_info);
1786 mutex_unlock(&registration_lock);
1787
1788 return ret;
1789 }
1790 EXPORT_SYMBOL(register_framebuffer);
1791
1792 /**
1793 * unregister_framebuffer - releases a frame buffer device
1794 * @fb_info: frame buffer info structure
1795 *
1796 * Unregisters a frame buffer device @fb_info.
1797 *
1798 * Returns negative errno on error, or zero for success.
1799 *
1800 * This function will also notify the framebuffer console
1801 * to release the driver.
1802 *
1803 * This is meant to be called within a driver's module_exit()
1804 * function. If this is called outside module_exit(), ensure
1805 * that the driver implements fb_open() and fb_release() to
1806 * check that no processes are using the device.
1807 */
1808 int
1809 unregister_framebuffer(struct fb_info *fb_info)
1810 {
1811 int ret;
1812
1813 mutex_lock(&registration_lock);
1814 ret = do_unregister_framebuffer(fb_info);
1815 mutex_unlock(&registration_lock);
1816
1817 return ret;
1818 }
1819 EXPORT_SYMBOL(unregister_framebuffer);
1820
1821 /**
1822 * fb_set_suspend - low level driver signals suspend
1823 * @info: framebuffer affected
1824 * @state: 0 = resuming, !=0 = suspending
1825 *
1826 * This is meant to be used by low level drivers to
1827 * signal suspend/resume to the core & clients.
1828 * It must be called with the console semaphore held
1829 */
1830 void fb_set_suspend(struct fb_info *info, int state)
1831 {
1832 struct fb_event event;
1833
1834 event.info = info;
1835 if (state) {
1836 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1837 info->state = FBINFO_STATE_SUSPENDED;
1838 } else {
1839 info->state = FBINFO_STATE_RUNNING;
1840 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1841 }
1842 }
1843 EXPORT_SYMBOL(fb_set_suspend);
1844
1845 /**
1846 * fbmem_init - init frame buffer subsystem
1847 *
1848 * Initialize the frame buffer subsystem.
1849 *
1850 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1851 *
1852 */
1853
1854 static int __init
1855 fbmem_init(void)
1856 {
1857 proc_create("fb", 0, NULL, &fb_proc_fops);
1858
1859 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1860 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1861
1862 fb_class = class_create(THIS_MODULE, "graphics");
1863 if (IS_ERR(fb_class)) {
1864 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1865 fb_class = NULL;
1866 }
1867 return 0;
1868 }
1869
1870 #ifdef MODULE
1871 module_init(fbmem_init);
1872 static void __exit
1873 fbmem_exit(void)
1874 {
1875 remove_proc_entry("fb", NULL);
1876 class_destroy(fb_class);
1877 unregister_chrdev(FB_MAJOR, "fb");
1878 }
1879
1880 module_exit(fbmem_exit);
1881 MODULE_LICENSE("GPL");
1882 MODULE_DESCRIPTION("Framebuffer base");
1883 #else
1884 subsys_initcall(fbmem_init);
1885 #endif
1886
1887 int fb_new_modelist(struct fb_info *info)
1888 {
1889 struct fb_event event;
1890 struct fb_var_screeninfo var = info->var;
1891 struct list_head *pos, *n;
1892 struct fb_modelist *modelist;
1893 struct fb_videomode *m, mode;
1894 int err = 1;
1895
1896 list_for_each_safe(pos, n, &info->modelist) {
1897 modelist = list_entry(pos, struct fb_modelist, list);
1898 m = &modelist->mode;
1899 fb_videomode_to_var(&var, m);
1900 var.activate = FB_ACTIVATE_TEST;
1901 err = fb_set_var(info, &var);
1902 fb_var_to_videomode(&mode, &var);
1903 if (err || !fb_mode_is_equal(m, &mode)) {
1904 list_del(pos);
1905 kfree(pos);
1906 }
1907 }
1908
1909 err = 1;
1910
1911 if (!list_empty(&info->modelist)) {
1912 event.info = info;
1913 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1914 }
1915
1916 return err;
1917 }
1918
1919 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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