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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / video / fbmem.c
blob7309ac704e2641e410fe75f60278e273348573e3
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 && image->dx >= 0; 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 && image->dy >= 0; 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_show_logo);
678
679 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
680 {
681 mutex_lock(&registration_lock);
682 return (*pos < FB_MAX) ? pos : NULL;
683 }
684
685 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
686 {
687 (*pos)++;
688 return (*pos < FB_MAX) ? pos : NULL;
689 }
690
691 static void fb_seq_stop(struct seq_file *m, void *v)
692 {
693 mutex_unlock(&registration_lock);
694 }
695
696 static int fb_seq_show(struct seq_file *m, void *v)
697 {
698 int i = *(loff_t *)v;
699 struct fb_info *fi = registered_fb[i];
700
701 if (fi)
702 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
703 return 0;
704 }
705
706 static const struct seq_operations proc_fb_seq_ops = {
707 .start = fb_seq_start,
708 .next = fb_seq_next,
709 .stop = fb_seq_stop,
710 .show = fb_seq_show,
711 };
712
713 static int proc_fb_open(struct inode *inode, struct file *file)
714 {
715 return seq_open(file, &proc_fb_seq_ops);
716 }
717
718 static const struct file_operations fb_proc_fops = {
719 .owner = THIS_MODULE,
720 .open = proc_fb_open,
721 .read = seq_read,
722 .llseek = seq_lseek,
723 .release = seq_release,
724 };
725
726 /*
727 * We hold a reference to the fb_info in file->private_data,
728 * but if the current registered fb has changed, we don't
729 * actually want to use it.
730 *
731 * So look up the fb_info using the inode minor number,
732 * and just verify it against the reference we have.
733 */
734 static struct fb_info *file_fb_info(struct file *file)
735 {
736 struct inode *inode = file_inode(file);
737 int fbidx = iminor(inode);
738 struct fb_info *info = registered_fb[fbidx];
739
740 if (info != file->private_data)
741 info = NULL;
742 return info;
743 }
744
745 static ssize_t
746 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
747 {
748 unsigned long p = *ppos;
749 struct fb_info *info = file_fb_info(file);
750 u8 *buffer, *dst;
751 u8 __iomem *src;
752 int c, cnt = 0, err = 0;
753 unsigned long total_size;
754
755 if (!info || ! info->screen_base)
756 return -ENODEV;
757
758 if (info->state != FBINFO_STATE_RUNNING)
759 return -EPERM;
760
761 if (info->fbops->fb_read)
762 return info->fbops->fb_read(info, buf, count, ppos);
763
764 total_size = info->screen_size;
765
766 if (total_size == 0)
767 total_size = info->fix.smem_len;
768
769 if (p >= total_size)
770 return 0;
771
772 if (count >= total_size)
773 count = total_size;
774
775 if (count + p > total_size)
776 count = total_size - p;
777
778 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
779 GFP_KERNEL);
780 if (!buffer)
781 return -ENOMEM;
782
783 src = (u8 __iomem *) (info->screen_base + p);
784
785 if (info->fbops->fb_sync)
786 info->fbops->fb_sync(info);
787
788 while (count) {
789 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
790 dst = buffer;
791 fb_memcpy_fromfb(dst, src, c);
792 dst += c;
793 src += c;
794
795 if (copy_to_user(buf, buffer, c)) {
796 err = -EFAULT;
797 break;
798 }
799 *ppos += c;
800 buf += c;
801 cnt += c;
802 count -= c;
803 }
804
805 kfree(buffer);
806
807 return (err) ? err : cnt;
808 }
809
810 static ssize_t
811 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
812 {
813 unsigned long p = *ppos;
814 struct fb_info *info = file_fb_info(file);
815 u8 *buffer, *src;
816 u8 __iomem *dst;
817 int c, cnt = 0, err = 0;
818 unsigned long total_size;
819
820 if (!info || !info->screen_base)
821 return -ENODEV;
822
823 if (info->state != FBINFO_STATE_RUNNING)
824 return -EPERM;
825
826 if (info->fbops->fb_write)
827 return info->fbops->fb_write(info, buf, count, ppos);
828
829 total_size = info->screen_size;
830
831 if (total_size == 0)
832 total_size = info->fix.smem_len;
833
834 if (p > total_size)
835 return -EFBIG;
836
837 if (count > total_size) {
838 err = -EFBIG;
839 count = total_size;
840 }
841
842 if (count + p > total_size) {
843 if (!err)
844 err = -ENOSPC;
845
846 count = total_size - p;
847 }
848
849 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
850 GFP_KERNEL);
851 if (!buffer)
852 return -ENOMEM;
853
854 dst = (u8 __iomem *) (info->screen_base + p);
855
856 if (info->fbops->fb_sync)
857 info->fbops->fb_sync(info);
858
859 while (count) {
860 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
861 src = buffer;
862
863 if (copy_from_user(src, buf, c)) {
864 err = -EFAULT;
865 break;
866 }
867
868 fb_memcpy_tofb(dst, src, c);
869 dst += c;
870 src += c;
871 *ppos += c;
872 buf += c;
873 cnt += c;
874 count -= c;
875 }
876
877 kfree(buffer);
878
879 return (cnt) ? cnt : err;
880 }
881
882 int
883 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
884 {
885 struct fb_fix_screeninfo *fix = &info->fix;
886 unsigned int yres = info->var.yres;
887 int err = 0;
888
889 if (var->yoffset > 0) {
890 if (var->vmode & FB_VMODE_YWRAP) {
891 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
892 err = -EINVAL;
893 else
894 yres = 0;
895 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
896 err = -EINVAL;
897 }
898
899 if (var->xoffset > 0 && (!fix->xpanstep ||
900 (var->xoffset % fix->xpanstep)))
901 err = -EINVAL;
902
903 if (err || !info->fbops->fb_pan_display ||
904 var->yoffset > info->var.yres_virtual - yres ||
905 var->xoffset > info->var.xres_virtual - info->var.xres)
906 return -EINVAL;
907
908 if ((err = info->fbops->fb_pan_display(var, info)))
909 return err;
910 info->var.xoffset = var->xoffset;
911 info->var.yoffset = var->yoffset;
912 if (var->vmode & FB_VMODE_YWRAP)
913 info->var.vmode |= FB_VMODE_YWRAP;
914 else
915 info->var.vmode &= ~FB_VMODE_YWRAP;
916 return 0;
917 }
918 EXPORT_SYMBOL(fb_pan_display);
919
920 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
921 u32 activate)
922 {
923 struct fb_event event;
924 struct fb_blit_caps caps, fbcaps;
925 int err = 0;
926
927 memset(&caps, 0, sizeof(caps));
928 memset(&fbcaps, 0, sizeof(fbcaps));
929 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
930 event.info = info;
931 event.data = &caps;
932 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
933 info->fbops->fb_get_caps(info, &fbcaps, var);
934
935 if (((fbcaps.x ^ caps.x) & caps.x) ||
936 ((fbcaps.y ^ caps.y) & caps.y) ||
937 (fbcaps.len < caps.len))
938 err = -EINVAL;
939
940 return err;
941 }
942
943 int
944 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
945 {
946 int flags = info->flags;
947 int ret = 0;
948
949 if (var->activate & FB_ACTIVATE_INV_MODE) {
950 struct fb_videomode mode1, mode2;
951
952 fb_var_to_videomode(&mode1, var);
953 fb_var_to_videomode(&mode2, &info->var);
954 /* make sure we don't delete the videomode of current var */
955 ret = fb_mode_is_equal(&mode1, &mode2);
956
957 if (!ret) {
958 struct fb_event event;
959
960 event.info = info;
961 event.data = &mode1;
962 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
963 }
964
965 if (!ret)
966 fb_delete_videomode(&mode1, &info->modelist);
967
968
969 ret = (ret) ? -EINVAL : 0;
970 goto done;
971 }
972
973 if ((var->activate & FB_ACTIVATE_FORCE) ||
974 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
975 u32 activate = var->activate;
976
977 /* When using FOURCC mode, make sure the red, green, blue and
978 * transp fields are set to 0.
979 */
980 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
981 var->grayscale > 1) {
982 if (var->red.offset || var->green.offset ||
983 var->blue.offset || var->transp.offset ||
984 var->red.length || var->green.length ||
985 var->blue.length || var->transp.length ||
986 var->red.msb_right || var->green.msb_right ||
987 var->blue.msb_right || var->transp.msb_right)
988 return -EINVAL;
989 }
990
991 if (!info->fbops->fb_check_var) {
992 *var = info->var;
993 goto done;
994 }
995
996 ret = info->fbops->fb_check_var(var, info);
997
998 if (ret)
999 goto done;
1000
1001 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1002 struct fb_var_screeninfo old_var;
1003 struct fb_videomode mode;
1004
1005 if (info->fbops->fb_get_caps) {
1006 ret = fb_check_caps(info, var, activate);
1007
1008 if (ret)
1009 goto done;
1010 }
1011
1012 old_var = info->var;
1013 info->var = *var;
1014
1015 if (info->fbops->fb_set_par) {
1016 ret = info->fbops->fb_set_par(info);
1017
1018 if (ret) {
1019 info->var = old_var;
1020 printk(KERN_WARNING "detected "
1021 "fb_set_par error, "
1022 "error code: %d\n", ret);
1023 goto done;
1024 }
1025 }
1026
1027 fb_pan_display(info, &info->var);
1028 fb_set_cmap(&info->cmap, info);
1029 fb_var_to_videomode(&mode, &info->var);
1030
1031 if (info->modelist.prev && info->modelist.next &&
1032 !list_empty(&info->modelist))
1033 ret = fb_add_videomode(&mode, &info->modelist);
1034
1035 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1036 struct fb_event event;
1037 int evnt = (activate & FB_ACTIVATE_ALL) ?
1038 FB_EVENT_MODE_CHANGE_ALL :
1039 FB_EVENT_MODE_CHANGE;
1040
1041 info->flags &= ~FBINFO_MISC_USEREVENT;
1042 event.info = info;
1043 event.data = &mode;
1044 fb_notifier_call_chain(evnt, &event);
1045 }
1046 }
1047 }
1048
1049 done:
1050 return ret;
1051 }
1052 EXPORT_SYMBOL(fb_set_var);
1053
1054 int
1055 fb_blank(struct fb_info *info, int blank)
1056 {
1057 struct fb_event event;
1058 int ret = -EINVAL, early_ret;
1059
1060 if (blank > FB_BLANK_POWERDOWN)
1061 blank = FB_BLANK_POWERDOWN;
1062
1063 event.info = info;
1064 event.data = &blank;
1065
1066 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1067
1068 if (info->fbops->fb_blank)
1069 ret = info->fbops->fb_blank(blank, info);
1070
1071 if (!ret)
1072 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1073 else {
1074 /*
1075 * if fb_blank is failed then revert effects of
1076 * the early blank event.
1077 */
1078 if (!early_ret)
1079 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1080 }
1081
1082 return ret;
1083 }
1084 EXPORT_SYMBOL(fb_blank);
1085
1086 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1087 unsigned long arg)
1088 {
1089 struct fb_ops *fb;
1090 struct fb_var_screeninfo var;
1091 struct fb_fix_screeninfo fix;
1092 struct fb_con2fbmap con2fb;
1093 struct fb_cmap cmap_from;
1094 struct fb_cmap_user cmap;
1095 struct fb_event event;
1096 void __user *argp = (void __user *)arg;
1097 long ret = 0;
1098
1099 switch (cmd) {
1100 case FBIOGET_VSCREENINFO:
1101 if (!lock_fb_info(info))
1102 return -ENODEV;
1103 var = info->var;
1104 unlock_fb_info(info);
1105
1106 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1107 break;
1108 case FBIOPUT_VSCREENINFO:
1109 if (copy_from_user(&var, argp, sizeof(var)))
1110 return -EFAULT;
1111 console_lock();
1112 if (!lock_fb_info(info)) {
1113 console_unlock();
1114 return -ENODEV;
1115 }
1116 info->flags |= FBINFO_MISC_USEREVENT;
1117 ret = fb_set_var(info, &var);
1118 info->flags &= ~FBINFO_MISC_USEREVENT;
1119 unlock_fb_info(info);
1120 console_unlock();
1121 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1122 ret = -EFAULT;
1123 break;
1124 case FBIOGET_FSCREENINFO:
1125 if (!lock_fb_info(info))
1126 return -ENODEV;
1127 fix = info->fix;
1128 unlock_fb_info(info);
1129
1130 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1131 break;
1132 case FBIOPUTCMAP:
1133 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1134 return -EFAULT;
1135 ret = fb_set_user_cmap(&cmap, info);
1136 break;
1137 case FBIOGETCMAP:
1138 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1139 return -EFAULT;
1140 if (!lock_fb_info(info))
1141 return -ENODEV;
1142 cmap_from = info->cmap;
1143 unlock_fb_info(info);
1144 ret = fb_cmap_to_user(&cmap_from, &cmap);
1145 break;
1146 case FBIOPAN_DISPLAY:
1147 if (copy_from_user(&var, argp, sizeof(var)))
1148 return -EFAULT;
1149 console_lock();
1150 if (!lock_fb_info(info)) {
1151 console_unlock();
1152 return -ENODEV;
1153 }
1154 ret = fb_pan_display(info, &var);
1155 unlock_fb_info(info);
1156 console_unlock();
1157 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1158 return -EFAULT;
1159 break;
1160 case FBIO_CURSOR:
1161 ret = -EINVAL;
1162 break;
1163 case FBIOGET_CON2FBMAP:
1164 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1165 return -EFAULT;
1166 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1167 return -EINVAL;
1168 con2fb.framebuffer = -1;
1169 event.data = &con2fb;
1170 if (!lock_fb_info(info))
1171 return -ENODEV;
1172 event.info = info;
1173 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1174 unlock_fb_info(info);
1175 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1176 break;
1177 case FBIOPUT_CON2FBMAP:
1178 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1179 return -EFAULT;
1180 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1181 return -EINVAL;
1182 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1183 return -EINVAL;
1184 if (!registered_fb[con2fb.framebuffer])
1185 request_module("fb%d", con2fb.framebuffer);
1186 if (!registered_fb[con2fb.framebuffer]) {
1187 ret = -EINVAL;
1188 break;
1189 }
1190 event.data = &con2fb;
1191 console_lock();
1192 if (!lock_fb_info(info)) {
1193 console_unlock();
1194 return -ENODEV;
1195 }
1196 event.info = info;
1197 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1198 unlock_fb_info(info);
1199 console_unlock();
1200 break;
1201 case FBIOBLANK:
1202 console_lock();
1203 if (!lock_fb_info(info)) {
1204 console_unlock();
1205 return -ENODEV;
1206 }
1207 info->flags |= FBINFO_MISC_USEREVENT;
1208 ret = fb_blank(info, arg);
1209 info->flags &= ~FBINFO_MISC_USEREVENT;
1210 unlock_fb_info(info);
1211 console_unlock();
1212 break;
1213 default:
1214 if (!lock_fb_info(info))
1215 return -ENODEV;
1216 fb = info->fbops;
1217 if (fb->fb_ioctl)
1218 ret = fb->fb_ioctl(info, cmd, arg);
1219 else
1220 ret = -ENOTTY;
1221 unlock_fb_info(info);
1222 }
1223 return ret;
1224 }
1225
1226 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1227 {
1228 struct fb_info *info = file_fb_info(file);
1229
1230 if (!info)
1231 return -ENODEV;
1232 return do_fb_ioctl(info, cmd, arg);
1233 }
1234
1235 #ifdef CONFIG_COMPAT
1236 struct fb_fix_screeninfo32 {
1237 char id[16];
1238 compat_caddr_t smem_start;
1239 u32 smem_len;
1240 u32 type;
1241 u32 type_aux;
1242 u32 visual;
1243 u16 xpanstep;
1244 u16 ypanstep;
1245 u16 ywrapstep;
1246 u32 line_length;
1247 compat_caddr_t mmio_start;
1248 u32 mmio_len;
1249 u32 accel;
1250 u16 reserved[3];
1251 };
1252
1253 struct fb_cmap32 {
1254 u32 start;
1255 u32 len;
1256 compat_caddr_t red;
1257 compat_caddr_t green;
1258 compat_caddr_t blue;
1259 compat_caddr_t transp;
1260 };
1261
1262 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1263 unsigned long arg)
1264 {
1265 struct fb_cmap_user __user *cmap;
1266 struct fb_cmap32 __user *cmap32;
1267 __u32 data;
1268 int err;
1269
1270 cmap = compat_alloc_user_space(sizeof(*cmap));
1271 cmap32 = compat_ptr(arg);
1272
1273 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1274 return -EFAULT;
1275
1276 if (get_user(data, &cmap32->red) ||
1277 put_user(compat_ptr(data), &cmap->red) ||
1278 get_user(data, &cmap32->green) ||
1279 put_user(compat_ptr(data), &cmap->green) ||
1280 get_user(data, &cmap32->blue) ||
1281 put_user(compat_ptr(data), &cmap->blue) ||
1282 get_user(data, &cmap32->transp) ||
1283 put_user(compat_ptr(data), &cmap->transp))
1284 return -EFAULT;
1285
1286 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1287
1288 if (!err) {
1289 if (copy_in_user(&cmap32->start,
1290 &cmap->start,
1291 2 * sizeof(__u32)))
1292 err = -EFAULT;
1293 }
1294 return err;
1295 }
1296
1297 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1298 struct fb_fix_screeninfo32 __user *fix32)
1299 {
1300 __u32 data;
1301 int err;
1302
1303 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1304
1305 data = (__u32) (unsigned long) fix->smem_start;
1306 err |= put_user(data, &fix32->smem_start);
1307
1308 err |= put_user(fix->smem_len, &fix32->smem_len);
1309 err |= put_user(fix->type, &fix32->type);
1310 err |= put_user(fix->type_aux, &fix32->type_aux);
1311 err |= put_user(fix->visual, &fix32->visual);
1312 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1313 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1314 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1315 err |= put_user(fix->line_length, &fix32->line_length);
1316
1317 data = (__u32) (unsigned long) fix->mmio_start;
1318 err |= put_user(data, &fix32->mmio_start);
1319
1320 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1321 err |= put_user(fix->accel, &fix32->accel);
1322 err |= copy_to_user(fix32->reserved, fix->reserved,
1323 sizeof(fix->reserved));
1324
1325 if (err)
1326 return -EFAULT;
1327 return 0;
1328 }
1329
1330 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1331 unsigned long arg)
1332 {
1333 mm_segment_t old_fs;
1334 struct fb_fix_screeninfo fix;
1335 struct fb_fix_screeninfo32 __user *fix32;
1336 int err;
1337
1338 fix32 = compat_ptr(arg);
1339
1340 old_fs = get_fs();
1341 set_fs(KERNEL_DS);
1342 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1343 set_fs(old_fs);
1344
1345 if (!err)
1346 err = do_fscreeninfo_to_user(&fix, fix32);
1347
1348 return err;
1349 }
1350
1351 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1352 unsigned long arg)
1353 {
1354 struct fb_info *info = file_fb_info(file);
1355 struct fb_ops *fb;
1356 long ret = -ENOIOCTLCMD;
1357
1358 if (!info)
1359 return -ENODEV;
1360 fb = info->fbops;
1361 switch(cmd) {
1362 case FBIOGET_VSCREENINFO:
1363 case FBIOPUT_VSCREENINFO:
1364 case FBIOPAN_DISPLAY:
1365 case FBIOGET_CON2FBMAP:
1366 case FBIOPUT_CON2FBMAP:
1367 arg = (unsigned long) compat_ptr(arg);
1368 case FBIOBLANK:
1369 ret = do_fb_ioctl(info, cmd, arg);
1370 break;
1371
1372 case FBIOGET_FSCREENINFO:
1373 ret = fb_get_fscreeninfo(info, cmd, arg);
1374 break;
1375
1376 case FBIOGETCMAP:
1377 case FBIOPUTCMAP:
1378 ret = fb_getput_cmap(info, cmd, arg);
1379 break;
1380
1381 default:
1382 if (fb->fb_compat_ioctl)
1383 ret = fb->fb_compat_ioctl(info, cmd, arg);
1384 break;
1385 }
1386 return ret;
1387 }
1388 #endif
1389
1390 static int
1391 fb_mmap(struct file *file, struct vm_area_struct * vma)
1392 {
1393 struct fb_info *info = file_fb_info(file);
1394 struct fb_ops *fb;
1395 unsigned long mmio_pgoff;
1396 unsigned long start;
1397 u32 len;
1398
1399 if (!info)
1400 return -ENODEV;
1401 fb = info->fbops;
1402 if (!fb)
1403 return -ENODEV;
1404 mutex_lock(&info->mm_lock);
1405 if (fb->fb_mmap) {
1406 int res;
1407 res = fb->fb_mmap(info, vma);
1408 mutex_unlock(&info->mm_lock);
1409 return res;
1410 }
1411
1412 /*
1413 * Ugh. This can be either the frame buffer mapping, or
1414 * if pgoff points past it, the mmio mapping.
1415 */
1416 start = info->fix.smem_start;
1417 len = info->fix.smem_len;
1418 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1419 if (vma->vm_pgoff >= mmio_pgoff) {
1420 if (info->var.accel_flags) {
1421 mutex_unlock(&info->mm_lock);
1422 return -EINVAL;
1423 }
1424
1425 vma->vm_pgoff -= mmio_pgoff;
1426 start = info->fix.mmio_start;
1427 len = info->fix.mmio_len;
1428 }
1429 mutex_unlock(&info->mm_lock);
1430
1431 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1432 fb_pgprotect(file, vma, start);
1433
1434 return vm_iomap_memory(vma, start, len);
1435 }
1436
1437 static int
1438 fb_open(struct inode *inode, struct file *file)
1439 __acquires(&info->lock)
1440 __releases(&info->lock)
1441 {
1442 int fbidx = iminor(inode);
1443 struct fb_info *info;
1444 int res = 0;
1445
1446 info = get_fb_info(fbidx);
1447 if (!info) {
1448 request_module("fb%d", fbidx);
1449 info = get_fb_info(fbidx);
1450 if (!info)
1451 return -ENODEV;
1452 }
1453 if (IS_ERR(info))
1454 return PTR_ERR(info);
1455
1456 mutex_lock(&info->lock);
1457 if (!try_module_get(info->fbops->owner)) {
1458 res = -ENODEV;
1459 goto out;
1460 }
1461 file->private_data = info;
1462 if (info->fbops->fb_open) {
1463 res = info->fbops->fb_open(info,1);
1464 if (res)
1465 module_put(info->fbops->owner);
1466 }
1467 #ifdef CONFIG_FB_DEFERRED_IO
1468 if (info->fbdefio)
1469 fb_deferred_io_open(info, inode, file);
1470 #endif
1471 out:
1472 mutex_unlock(&info->lock);
1473 if (res)
1474 put_fb_info(info);
1475 return res;
1476 }
1477
1478 static int
1479 fb_release(struct inode *inode, struct file *file)
1480 __acquires(&info->lock)
1481 __releases(&info->lock)
1482 {
1483 struct fb_info * const info = file->private_data;
1484
1485 mutex_lock(&info->lock);
1486 if (info->fbops->fb_release)
1487 info->fbops->fb_release(info,1);
1488 module_put(info->fbops->owner);
1489 mutex_unlock(&info->lock);
1490 put_fb_info(info);
1491 return 0;
1492 }
1493
1494 static const struct file_operations fb_fops = {
1495 .owner = THIS_MODULE,
1496 .read = fb_read,
1497 .write = fb_write,
1498 .unlocked_ioctl = fb_ioctl,
1499 #ifdef CONFIG_COMPAT
1500 .compat_ioctl = fb_compat_ioctl,
1501 #endif
1502 .mmap = fb_mmap,
1503 .open = fb_open,
1504 .release = fb_release,
1505 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1506 .get_unmapped_area = get_fb_unmapped_area,
1507 #endif
1508 #ifdef CONFIG_FB_DEFERRED_IO
1509 .fsync = fb_deferred_io_fsync,
1510 #endif
1511 .llseek = default_llseek,
1512 };
1513
1514 struct class *fb_class;
1515 EXPORT_SYMBOL(fb_class);
1516
1517 static int fb_check_foreignness(struct fb_info *fi)
1518 {
1519 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1520
1521 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1522
1523 #ifdef __BIG_ENDIAN
1524 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1525 #else
1526 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1527 #endif /* __BIG_ENDIAN */
1528
1529 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1530 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1531 "support this framebuffer\n", fi->fix.id);
1532 return -ENOSYS;
1533 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1534 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1535 "support this framebuffer\n", fi->fix.id);
1536 return -ENOSYS;
1537 }
1538
1539 return 0;
1540 }
1541
1542 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1543 {
1544 /* is the generic aperture base the same as the HW one */
1545 if (gen->base == hw->base)
1546 return true;
1547 /* is the generic aperture base inside the hw base->hw base+size */
1548 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1549 return true;
1550 return false;
1551 }
1552
1553 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1554 struct apertures_struct *hwa)
1555 {
1556 int i, j;
1557 if (!hwa || !gena)
1558 return false;
1559
1560 for (i = 0; i < hwa->count; ++i) {
1561 struct aperture *h = &hwa->ranges[i];
1562 for (j = 0; j < gena->count; ++j) {
1563 struct aperture *g = &gena->ranges[j];
1564 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1565 (unsigned long long)g->base,
1566 (unsigned long long)g->size,
1567 (unsigned long long)h->base,
1568 (unsigned long long)h->size);
1569 if (apertures_overlap(g, h))
1570 return true;
1571 }
1572 }
1573
1574 return false;
1575 }
1576
1577 static int do_unregister_framebuffer(struct fb_info *fb_info);
1578
1579 #define VGA_FB_PHYS 0xA0000
1580 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1581 const char *name, bool primary)
1582 {
1583 int i, ret;
1584
1585 /* check all firmware fbs and kick off if the base addr overlaps */
1586 for (i = 0 ; i < FB_MAX; i++) {
1587 struct apertures_struct *gen_aper;
1588 if (!registered_fb[i])
1589 continue;
1590
1591 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1592 continue;
1593
1594 gen_aper = registered_fb[i]->apertures;
1595 if (fb_do_apertures_overlap(gen_aper, a) ||
1596 (primary && gen_aper && gen_aper->count &&
1597 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1598
1599 printk(KERN_INFO "fb: conflicting fb hw usage "
1600 "%s vs %s - removing generic driver\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 int do_register_framebuffer(struct fb_info *fb_info)
1612 {
1613 int i, ret;
1614 struct fb_event event;
1615 struct fb_videomode mode;
1616
1617 if (fb_check_foreignness(fb_info))
1618 return -ENOSYS;
1619
1620 ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1621 fb_info->fix.id,
1622 fb_is_primary_device(fb_info));
1623 if (ret)
1624 return ret;
1625
1626 if (num_registered_fb == FB_MAX)
1627 return -ENXIO;
1628
1629 num_registered_fb++;
1630 for (i = 0 ; i < FB_MAX; i++)
1631 if (!registered_fb[i])
1632 break;
1633 fb_info->node = i;
1634 atomic_set(&fb_info->count, 1);
1635 mutex_init(&fb_info->lock);
1636 mutex_init(&fb_info->mm_lock);
1637
1638 fb_info->dev = device_create(fb_class, fb_info->device,
1639 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1640 if (IS_ERR(fb_info->dev)) {
1641 /* Not fatal */
1642 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1643 fb_info->dev = NULL;
1644 } else
1645 fb_init_device(fb_info);
1646
1647 if (fb_info->pixmap.addr == NULL) {
1648 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1649 if (fb_info->pixmap.addr) {
1650 fb_info->pixmap.size = FBPIXMAPSIZE;
1651 fb_info->pixmap.buf_align = 1;
1652 fb_info->pixmap.scan_align = 1;
1653 fb_info->pixmap.access_align = 32;
1654 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1655 }
1656 }
1657 fb_info->pixmap.offset = 0;
1658
1659 if (!fb_info->pixmap.blit_x)
1660 fb_info->pixmap.blit_x = ~(u32)0;
1661
1662 if (!fb_info->pixmap.blit_y)
1663 fb_info->pixmap.blit_y = ~(u32)0;
1664
1665 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1666 INIT_LIST_HEAD(&fb_info->modelist);
1667
1668 if (fb_info->skip_vt_switch)
1669 pm_vt_switch_required(fb_info->dev, false);
1670 else
1671 pm_vt_switch_required(fb_info->dev, true);
1672
1673 fb_var_to_videomode(&mode, &fb_info->var);
1674 fb_add_videomode(&mode, &fb_info->modelist);
1675 registered_fb[i] = fb_info;
1676
1677 event.info = fb_info;
1678 console_lock();
1679 if (!lock_fb_info(fb_info)) {
1680 console_unlock();
1681 return -ENODEV;
1682 }
1683
1684 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1685 unlock_fb_info(fb_info);
1686 console_unlock();
1687 return 0;
1688 }
1689
1690 static int do_unregister_framebuffer(struct fb_info *fb_info)
1691 {
1692 struct fb_event event;
1693 int i, ret = 0;
1694
1695 i = fb_info->node;
1696 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1697 return -EINVAL;
1698
1699 console_lock();
1700 if (!lock_fb_info(fb_info)) {
1701 console_unlock();
1702 return -ENODEV;
1703 }
1704
1705 event.info = fb_info;
1706 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1707 unlock_fb_info(fb_info);
1708 console_unlock();
1709
1710 if (ret)
1711 return -EINVAL;
1712
1713 pm_vt_switch_unregister(fb_info->dev);
1714
1715 unlink_framebuffer(fb_info);
1716 if (fb_info->pixmap.addr &&
1717 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1718 kfree(fb_info->pixmap.addr);
1719 fb_destroy_modelist(&fb_info->modelist);
1720 registered_fb[i] = NULL;
1721 num_registered_fb--;
1722 fb_cleanup_device(fb_info);
1723 event.info = fb_info;
1724 console_lock();
1725 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1726 console_unlock();
1727
1728 /* this may free fb info */
1729 put_fb_info(fb_info);
1730 return 0;
1731 }
1732
1733 int unlink_framebuffer(struct fb_info *fb_info)
1734 {
1735 int i;
1736
1737 i = fb_info->node;
1738 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1739 return -EINVAL;
1740
1741 if (fb_info->dev) {
1742 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1743 fb_info->dev = NULL;
1744 }
1745 return 0;
1746 }
1747 EXPORT_SYMBOL(unlink_framebuffer);
1748
1749 int remove_conflicting_framebuffers(struct apertures_struct *a,
1750 const char *name, bool primary)
1751 {
1752 int ret;
1753
1754 mutex_lock(&registration_lock);
1755 ret = do_remove_conflicting_framebuffers(a, name, primary);
1756 mutex_unlock(&registration_lock);
1757
1758 return ret;
1759 }
1760 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1761
1762 /**
1763 * register_framebuffer - registers a frame buffer device
1764 * @fb_info: frame buffer info structure
1765 *
1766 * Registers a frame buffer device @fb_info.
1767 *
1768 * Returns negative errno on error, or zero for success.
1769 *
1770 */
1771 int
1772 register_framebuffer(struct fb_info *fb_info)
1773 {
1774 int ret;
1775
1776 mutex_lock(&registration_lock);
1777 ret = do_register_framebuffer(fb_info);
1778 mutex_unlock(&registration_lock);
1779
1780 return ret;
1781 }
1782 EXPORT_SYMBOL(register_framebuffer);
1783
1784 /**
1785 * unregister_framebuffer - releases a frame buffer device
1786 * @fb_info: frame buffer info structure
1787 *
1788 * Unregisters a frame buffer device @fb_info.
1789 *
1790 * Returns negative errno on error, or zero for success.
1791 *
1792 * This function will also notify the framebuffer console
1793 * to release the driver.
1794 *
1795 * This is meant to be called within a driver's module_exit()
1796 * function. If this is called outside module_exit(), ensure
1797 * that the driver implements fb_open() and fb_release() to
1798 * check that no processes are using the device.
1799 */
1800 int
1801 unregister_framebuffer(struct fb_info *fb_info)
1802 {
1803 int ret;
1804
1805 mutex_lock(&registration_lock);
1806 ret = do_unregister_framebuffer(fb_info);
1807 mutex_unlock(&registration_lock);
1808
1809 return ret;
1810 }
1811 EXPORT_SYMBOL(unregister_framebuffer);
1812
1813 /**
1814 * fb_set_suspend - low level driver signals suspend
1815 * @info: framebuffer affected
1816 * @state: 0 = resuming, !=0 = suspending
1817 *
1818 * This is meant to be used by low level drivers to
1819 * signal suspend/resume to the core & clients.
1820 * It must be called with the console semaphore held
1821 */
1822 void fb_set_suspend(struct fb_info *info, int state)
1823 {
1824 struct fb_event event;
1825
1826 event.info = info;
1827 if (state) {
1828 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1829 info->state = FBINFO_STATE_SUSPENDED;
1830 } else {
1831 info->state = FBINFO_STATE_RUNNING;
1832 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1833 }
1834 }
1835 EXPORT_SYMBOL(fb_set_suspend);
1836
1837 /**
1838 * fbmem_init - init frame buffer subsystem
1839 *
1840 * Initialize the frame buffer subsystem.
1841 *
1842 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1843 *
1844 */
1845
1846 static int __init
1847 fbmem_init(void)
1848 {
1849 proc_create("fb", 0, NULL, &fb_proc_fops);
1850
1851 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1852 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1853
1854 fb_class = class_create(THIS_MODULE, "graphics");
1855 if (IS_ERR(fb_class)) {
1856 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1857 fb_class = NULL;
1858 }
1859 return 0;
1860 }
1861
1862 #ifdef MODULE
1863 module_init(fbmem_init);
1864 static void __exit
1865 fbmem_exit(void)
1866 {
1867 remove_proc_entry("fb", NULL);
1868 class_destroy(fb_class);
1869 unregister_chrdev(FB_MAJOR, "fb");
1870 }
1871
1872 module_exit(fbmem_exit);
1873 MODULE_LICENSE("GPL");
1874 MODULE_DESCRIPTION("Framebuffer base");
1875 #else
1876 subsys_initcall(fbmem_init);
1877 #endif
1878
1879 int fb_new_modelist(struct fb_info *info)
1880 {
1881 struct fb_event event;
1882 struct fb_var_screeninfo var = info->var;
1883 struct list_head *pos, *n;
1884 struct fb_modelist *modelist;
1885 struct fb_videomode *m, mode;
1886 int err = 1;
1887
1888 list_for_each_safe(pos, n, &info->modelist) {
1889 modelist = list_entry(pos, struct fb_modelist, list);
1890 m = &modelist->mode;
1891 fb_videomode_to_var(&var, m);
1892 var.activate = FB_ACTIVATE_TEST;
1893 err = fb_set_var(info, &var);
1894 fb_var_to_videomode(&mode, &var);
1895 if (err || !fb_mode_is_equal(m, &mode)) {
1896 list_del(pos);
1897 kfree(pos);
1898 }
1899 }
1900
1901 err = 1;
1902
1903 if (!list_empty(&info->modelist)) {
1904 event.info = info;
1905 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1906 }
1907
1908 return err;
1909 }
1910
1911 static char *video_options[FB_MAX] __read_mostly;
1912 static int ofonly __read_mostly;
1913
1914 /**
1915 * fb_get_options - get kernel boot parameters
1916 * @name: framebuffer name as it would appear in
1917 * the boot parameter line
1918 * (video=<name>:<options>)
1919 * @option: the option will be stored here
1920 *
1921 * NOTE: Needed to maintain backwards compatibility
1922 */
1923 int fb_get_options(const char *name, char **option)
1924 {
1925 char *opt, *options = NULL;
1926 int retval = 0;
1927 int name_len = strlen(name), i;
1928
1929 if (name_len && ofonly && strncmp(name, "offb", 4))
1930 retval = 1;
1931
1932 if (name_len && !retval) {
1933 for (i = 0; i < FB_MAX; i++) {
1934 if (video_options[i] == NULL)
1935 continue;
1936 if (!video_options[i][0])
1937 continue;
1938 opt = video_options[i];
1939 if (!strncmp(name, opt, name_len) &&
1940 opt[name_len] == ':')
1941 options = opt + name_len + 1;
1942 }
1943 }
1944 /* No match, pass global option */
1945 if (!options && option && fb_mode_option)
1946 options = kstrdup(fb_mode_option, GFP_KERNEL);
1947 if (options && !strncmp(options, "off", 3))
1948 retval = 1;
1949
1950 if (option)
1951 *option = options;
1952
1953 return retval;
1954 }
1955 EXPORT_SYMBOL(fb_get_options);
1956
1957 #ifndef MODULE
1958 /**
1959 * video_setup - process command line options
1960 * @options: string of options
1961 *
1962 * Process command line options for frame buffer subsystem.
1963 *
1964 * NOTE: This function is a __setup and __init function.
1965 * It only stores the options. Drivers have to call
1966 * fb_get_options() as necessary.
1967 *
1968 * Returns zero.
1969 *
1970 */
1971 static int __init video_setup(char *options)
1972 {
1973 int i, global = 0;
1974
1975 if (!options || !*options)
1976 global = 1;
1977
1978 if (!global && !strncmp(options, "ofonly", 6)) {
1979 ofonly = 1;
1980 global = 1;
1981 }
1982
1983 if (!global && !strchr(options, ':')) {
1984 fb_mode_option = options;
1985 global = 1;
1986 }
1987
1988 if (!global) {
1989 for (i = 0; i < FB_MAX; i++) {
1990 if (video_options[i] == NULL) {
1991 video_options[i] = options;
1992 break;
1993 }
1994
1995 }
1996 }
1997
1998 return 1;
1999 }
2000 __setup("video=", video_setup);
2001 #endif
2002
2003 MODULE_LICENSE("GPL");
Linux with added FPC-III support