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ixgbevf: bump driver version
[linux-2.6/btrfs-unstable.git] / drivers / video / fbmem.c
blobdacaf74256a30e0845ea06010d922e531b7dc804
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 if (!lock_fb_info(info))
1112 return -ENODEV;
1113 console_lock();
1114 info->flags |= FBINFO_MISC_USEREVENT;
1115 ret = fb_set_var(info, &var);
1116 info->flags &= ~FBINFO_MISC_USEREVENT;
1117 console_unlock();
1118 unlock_fb_info(info);
1119 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1120 ret = -EFAULT;
1121 break;
1122 case FBIOGET_FSCREENINFO:
1123 if (!lock_fb_info(info))
1124 return -ENODEV;
1125 fix = info->fix;
1126 unlock_fb_info(info);
1127
1128 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1129 break;
1130 case FBIOPUTCMAP:
1131 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1132 return -EFAULT;
1133 ret = fb_set_user_cmap(&cmap, info);
1134 break;
1135 case FBIOGETCMAP:
1136 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1137 return -EFAULT;
1138 if (!lock_fb_info(info))
1139 return -ENODEV;
1140 cmap_from = info->cmap;
1141 unlock_fb_info(info);
1142 ret = fb_cmap_to_user(&cmap_from, &cmap);
1143 break;
1144 case FBIOPAN_DISPLAY:
1145 if (copy_from_user(&var, argp, sizeof(var)))
1146 return -EFAULT;
1147 if (!lock_fb_info(info))
1148 return -ENODEV;
1149 console_lock();
1150 ret = fb_pan_display(info, &var);
1151 console_unlock();
1152 unlock_fb_info(info);
1153 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1154 return -EFAULT;
1155 break;
1156 case FBIO_CURSOR:
1157 ret = -EINVAL;
1158 break;
1159 case FBIOGET_CON2FBMAP:
1160 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1161 return -EFAULT;
1162 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1163 return -EINVAL;
1164 con2fb.framebuffer = -1;
1165 event.data = &con2fb;
1166 if (!lock_fb_info(info))
1167 return -ENODEV;
1168 event.info = info;
1169 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1170 unlock_fb_info(info);
1171 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1172 break;
1173 case FBIOPUT_CON2FBMAP:
1174 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1175 return -EFAULT;
1176 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1177 return -EINVAL;
1178 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1179 return -EINVAL;
1180 if (!registered_fb[con2fb.framebuffer])
1181 request_module("fb%d", con2fb.framebuffer);
1182 if (!registered_fb[con2fb.framebuffer]) {
1183 ret = -EINVAL;
1184 break;
1185 }
1186 event.data = &con2fb;
1187 if (!lock_fb_info(info))
1188 return -ENODEV;
1189 console_lock();
1190 event.info = info;
1191 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1192 console_unlock();
1193 unlock_fb_info(info);
1194 break;
1195 case FBIOBLANK:
1196 if (!lock_fb_info(info))
1197 return -ENODEV;
1198 console_lock();
1199 info->flags |= FBINFO_MISC_USEREVENT;
1200 ret = fb_blank(info, arg);
1201 info->flags &= ~FBINFO_MISC_USEREVENT;
1202 console_unlock();
1203 unlock_fb_info(info);
1204 break;
1205 default:
1206 if (!lock_fb_info(info))
1207 return -ENODEV;
1208 fb = info->fbops;
1209 if (fb->fb_ioctl)
1210 ret = fb->fb_ioctl(info, cmd, arg);
1211 else
1212 ret = -ENOTTY;
1213 unlock_fb_info(info);
1214 }
1215 return ret;
1216 }
1217
1218 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1219 {
1220 struct fb_info *info = file_fb_info(file);
1221
1222 if (!info)
1223 return -ENODEV;
1224 return do_fb_ioctl(info, cmd, arg);
1225 }
1226
1227 #ifdef CONFIG_COMPAT
1228 struct fb_fix_screeninfo32 {
1229 char id[16];
1230 compat_caddr_t smem_start;
1231 u32 smem_len;
1232 u32 type;
1233 u32 type_aux;
1234 u32 visual;
1235 u16 xpanstep;
1236 u16 ypanstep;
1237 u16 ywrapstep;
1238 u32 line_length;
1239 compat_caddr_t mmio_start;
1240 u32 mmio_len;
1241 u32 accel;
1242 u16 reserved[3];
1243 };
1244
1245 struct fb_cmap32 {
1246 u32 start;
1247 u32 len;
1248 compat_caddr_t red;
1249 compat_caddr_t green;
1250 compat_caddr_t blue;
1251 compat_caddr_t transp;
1252 };
1253
1254 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1255 unsigned long arg)
1256 {
1257 struct fb_cmap_user __user *cmap;
1258 struct fb_cmap32 __user *cmap32;
1259 __u32 data;
1260 int err;
1261
1262 cmap = compat_alloc_user_space(sizeof(*cmap));
1263 cmap32 = compat_ptr(arg);
1264
1265 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1266 return -EFAULT;
1267
1268 if (get_user(data, &cmap32->red) ||
1269 put_user(compat_ptr(data), &cmap->red) ||
1270 get_user(data, &cmap32->green) ||
1271 put_user(compat_ptr(data), &cmap->green) ||
1272 get_user(data, &cmap32->blue) ||
1273 put_user(compat_ptr(data), &cmap->blue) ||
1274 get_user(data, &cmap32->transp) ||
1275 put_user(compat_ptr(data), &cmap->transp))
1276 return -EFAULT;
1277
1278 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1279
1280 if (!err) {
1281 if (copy_in_user(&cmap32->start,
1282 &cmap->start,
1283 2 * sizeof(__u32)))
1284 err = -EFAULT;
1285 }
1286 return err;
1287 }
1288
1289 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1290 struct fb_fix_screeninfo32 __user *fix32)
1291 {
1292 __u32 data;
1293 int err;
1294
1295 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1296
1297 data = (__u32) (unsigned long) fix->smem_start;
1298 err |= put_user(data, &fix32->smem_start);
1299
1300 err |= put_user(fix->smem_len, &fix32->smem_len);
1301 err |= put_user(fix->type, &fix32->type);
1302 err |= put_user(fix->type_aux, &fix32->type_aux);
1303 err |= put_user(fix->visual, &fix32->visual);
1304 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1305 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1306 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1307 err |= put_user(fix->line_length, &fix32->line_length);
1308
1309 data = (__u32) (unsigned long) fix->mmio_start;
1310 err |= put_user(data, &fix32->mmio_start);
1311
1312 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1313 err |= put_user(fix->accel, &fix32->accel);
1314 err |= copy_to_user(fix32->reserved, fix->reserved,
1315 sizeof(fix->reserved));
1316
1317 if (err)
1318 return -EFAULT;
1319 return 0;
1320 }
1321
1322 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1323 unsigned long arg)
1324 {
1325 mm_segment_t old_fs;
1326 struct fb_fix_screeninfo fix;
1327 struct fb_fix_screeninfo32 __user *fix32;
1328 int err;
1329
1330 fix32 = compat_ptr(arg);
1331
1332 old_fs = get_fs();
1333 set_fs(KERNEL_DS);
1334 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1335 set_fs(old_fs);
1336
1337 if (!err)
1338 err = do_fscreeninfo_to_user(&fix, fix32);
1339
1340 return err;
1341 }
1342
1343 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1344 unsigned long arg)
1345 {
1346 struct fb_info *info = file_fb_info(file);
1347 struct fb_ops *fb;
1348 long ret = -ENOIOCTLCMD;
1349
1350 if (!info)
1351 return -ENODEV;
1352 fb = info->fbops;
1353 switch(cmd) {
1354 case FBIOGET_VSCREENINFO:
1355 case FBIOPUT_VSCREENINFO:
1356 case FBIOPAN_DISPLAY:
1357 case FBIOGET_CON2FBMAP:
1358 case FBIOPUT_CON2FBMAP:
1359 arg = (unsigned long) compat_ptr(arg);
1360 case FBIOBLANK:
1361 ret = do_fb_ioctl(info, cmd, arg);
1362 break;
1363
1364 case FBIOGET_FSCREENINFO:
1365 ret = fb_get_fscreeninfo(info, cmd, arg);
1366 break;
1367
1368 case FBIOGETCMAP:
1369 case FBIOPUTCMAP:
1370 ret = fb_getput_cmap(info, cmd, arg);
1371 break;
1372
1373 default:
1374 if (fb->fb_compat_ioctl)
1375 ret = fb->fb_compat_ioctl(info, cmd, arg);
1376 break;
1377 }
1378 return ret;
1379 }
1380 #endif
1381
1382 static int
1383 fb_mmap(struct file *file, struct vm_area_struct * vma)
1384 {
1385 struct fb_info *info = file_fb_info(file);
1386 struct fb_ops *fb;
1387 unsigned long mmio_pgoff;
1388 unsigned long start;
1389 u32 len;
1390
1391 if (!info)
1392 return -ENODEV;
1393 fb = info->fbops;
1394 if (!fb)
1395 return -ENODEV;
1396 mutex_lock(&info->mm_lock);
1397 if (fb->fb_mmap) {
1398 int res;
1399 res = fb->fb_mmap(info, vma);
1400 mutex_unlock(&info->mm_lock);
1401 return res;
1402 }
1403
1404 /*
1405 * Ugh. This can be either the frame buffer mapping, or
1406 * if pgoff points past it, the mmio mapping.
1407 */
1408 start = info->fix.smem_start;
1409 len = info->fix.smem_len;
1410 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1411 if (vma->vm_pgoff >= mmio_pgoff) {
1412 if (info->var.accel_flags) {
1413 mutex_unlock(&info->mm_lock);
1414 return -EINVAL;
1415 }
1416
1417 vma->vm_pgoff -= mmio_pgoff;
1418 start = info->fix.mmio_start;
1419 len = info->fix.mmio_len;
1420 }
1421 mutex_unlock(&info->mm_lock);
1422
1423 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1424 fb_pgprotect(file, vma, start);
1425
1426 return vm_iomap_memory(vma, start, len);
1427 }
1428
1429 static int
1430 fb_open(struct inode *inode, struct file *file)
1431 __acquires(&info->lock)
1432 __releases(&info->lock)
1433 {
1434 int fbidx = iminor(inode);
1435 struct fb_info *info;
1436 int res = 0;
1437
1438 info = get_fb_info(fbidx);
1439 if (!info) {
1440 request_module("fb%d", fbidx);
1441 info = get_fb_info(fbidx);
1442 if (!info)
1443 return -ENODEV;
1444 }
1445 if (IS_ERR(info))
1446 return PTR_ERR(info);
1447
1448 mutex_lock(&info->lock);
1449 if (!try_module_get(info->fbops->owner)) {
1450 res = -ENODEV;
1451 goto out;
1452 }
1453 file->private_data = info;
1454 if (info->fbops->fb_open) {
1455 res = info->fbops->fb_open(info,1);
1456 if (res)
1457 module_put(info->fbops->owner);
1458 }
1459 #ifdef CONFIG_FB_DEFERRED_IO
1460 if (info->fbdefio)
1461 fb_deferred_io_open(info, inode, file);
1462 #endif
1463 out:
1464 mutex_unlock(&info->lock);
1465 if (res)
1466 put_fb_info(info);
1467 return res;
1468 }
1469
1470 static int
1471 fb_release(struct inode *inode, struct file *file)
1472 __acquires(&info->lock)
1473 __releases(&info->lock)
1474 {
1475 struct fb_info * const info = file->private_data;
1476
1477 mutex_lock(&info->lock);
1478 if (info->fbops->fb_release)
1479 info->fbops->fb_release(info,1);
1480 module_put(info->fbops->owner);
1481 mutex_unlock(&info->lock);
1482 put_fb_info(info);
1483 return 0;
1484 }
1485
1486 static const struct file_operations fb_fops = {
1487 .owner = THIS_MODULE,
1488 .read = fb_read,
1489 .write = fb_write,
1490 .unlocked_ioctl = fb_ioctl,
1491 #ifdef CONFIG_COMPAT
1492 .compat_ioctl = fb_compat_ioctl,
1493 #endif
1494 .mmap = fb_mmap,
1495 .open = fb_open,
1496 .release = fb_release,
1497 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1498 .get_unmapped_area = get_fb_unmapped_area,
1499 #endif
1500 #ifdef CONFIG_FB_DEFERRED_IO
1501 .fsync = fb_deferred_io_fsync,
1502 #endif
1503 .llseek = default_llseek,
1504 };
1505
1506 struct class *fb_class;
1507 EXPORT_SYMBOL(fb_class);
1508
1509 static int fb_check_foreignness(struct fb_info *fi)
1510 {
1511 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1512
1513 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1514
1515 #ifdef __BIG_ENDIAN
1516 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1517 #else
1518 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1519 #endif /* __BIG_ENDIAN */
1520
1521 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1522 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1523 "support this framebuffer\n", fi->fix.id);
1524 return -ENOSYS;
1525 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1526 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1527 "support this framebuffer\n", fi->fix.id);
1528 return -ENOSYS;
1529 }
1530
1531 return 0;
1532 }
1533
1534 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1535 {
1536 /* is the generic aperture base the same as the HW one */
1537 if (gen->base == hw->base)
1538 return true;
1539 /* is the generic aperture base inside the hw base->hw base+size */
1540 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1541 return true;
1542 return false;
1543 }
1544
1545 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1546 struct apertures_struct *hwa)
1547 {
1548 int i, j;
1549 if (!hwa || !gena)
1550 return false;
1551
1552 for (i = 0; i < hwa->count; ++i) {
1553 struct aperture *h = &hwa->ranges[i];
1554 for (j = 0; j < gena->count; ++j) {
1555 struct aperture *g = &gena->ranges[j];
1556 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1557 (unsigned long long)g->base,
1558 (unsigned long long)g->size,
1559 (unsigned long long)h->base,
1560 (unsigned long long)h->size);
1561 if (apertures_overlap(g, h))
1562 return true;
1563 }
1564 }
1565
1566 return false;
1567 }
1568
1569 static int do_unregister_framebuffer(struct fb_info *fb_info);
1570
1571 #define VGA_FB_PHYS 0xA0000
1572 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1573 const char *name, bool primary)
1574 {
1575 int i;
1576
1577 /* check all firmware fbs and kick off if the base addr overlaps */
1578 for (i = 0 ; i < FB_MAX; i++) {
1579 struct apertures_struct *gen_aper;
1580 if (!registered_fb[i])
1581 continue;
1582
1583 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1584 continue;
1585
1586 gen_aper = registered_fb[i]->apertures;
1587 if (fb_do_apertures_overlap(gen_aper, a) ||
1588 (primary && gen_aper && gen_aper->count &&
1589 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1590
1591 printk(KERN_INFO "fb: conflicting fb hw usage "
1592 "%s vs %s - removing generic driver\n",
1593 name, registered_fb[i]->fix.id);
1594 do_unregister_framebuffer(registered_fb[i]);
1595 }
1596 }
1597 }
1598
1599 static int do_register_framebuffer(struct fb_info *fb_info)
1600 {
1601 int i;
1602 struct fb_event event;
1603 struct fb_videomode mode;
1604
1605 if (fb_check_foreignness(fb_info))
1606 return -ENOSYS;
1607
1608 do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1609 fb_is_primary_device(fb_info));
1610
1611 if (num_registered_fb == FB_MAX)
1612 return -ENXIO;
1613
1614 num_registered_fb++;
1615 for (i = 0 ; i < FB_MAX; i++)
1616 if (!registered_fb[i])
1617 break;
1618 fb_info->node = i;
1619 atomic_set(&fb_info->count, 1);
1620 mutex_init(&fb_info->lock);
1621 mutex_init(&fb_info->mm_lock);
1622
1623 fb_info->dev = device_create(fb_class, fb_info->device,
1624 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1625 if (IS_ERR(fb_info->dev)) {
1626 /* Not fatal */
1627 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1628 fb_info->dev = NULL;
1629 } else
1630 fb_init_device(fb_info);
1631
1632 if (fb_info->pixmap.addr == NULL) {
1633 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1634 if (fb_info->pixmap.addr) {
1635 fb_info->pixmap.size = FBPIXMAPSIZE;
1636 fb_info->pixmap.buf_align = 1;
1637 fb_info->pixmap.scan_align = 1;
1638 fb_info->pixmap.access_align = 32;
1639 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1640 }
1641 }
1642 fb_info->pixmap.offset = 0;
1643
1644 if (!fb_info->pixmap.blit_x)
1645 fb_info->pixmap.blit_x = ~(u32)0;
1646
1647 if (!fb_info->pixmap.blit_y)
1648 fb_info->pixmap.blit_y = ~(u32)0;
1649
1650 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1651 INIT_LIST_HEAD(&fb_info->modelist);
1652
1653 if (fb_info->skip_vt_switch)
1654 pm_vt_switch_required(fb_info->dev, false);
1655 else
1656 pm_vt_switch_required(fb_info->dev, true);
1657
1658 fb_var_to_videomode(&mode, &fb_info->var);
1659 fb_add_videomode(&mode, &fb_info->modelist);
1660 registered_fb[i] = fb_info;
1661
1662 event.info = fb_info;
1663 if (!lock_fb_info(fb_info))
1664 return -ENODEV;
1665 console_lock();
1666 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1667 console_unlock();
1668 unlock_fb_info(fb_info);
1669 return 0;
1670 }
1671
1672 static int do_unregister_framebuffer(struct fb_info *fb_info)
1673 {
1674 struct fb_event event;
1675 int i, ret = 0;
1676
1677 i = fb_info->node;
1678 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1679 return -EINVAL;
1680
1681 if (!lock_fb_info(fb_info))
1682 return -ENODEV;
1683 console_lock();
1684 event.info = fb_info;
1685 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1686 console_unlock();
1687 unlock_fb_info(fb_info);
1688
1689 if (ret)
1690 return -EINVAL;
1691
1692 pm_vt_switch_unregister(fb_info->dev);
1693
1694 unlink_framebuffer(fb_info);
1695 if (fb_info->pixmap.addr &&
1696 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1697 kfree(fb_info->pixmap.addr);
1698 fb_destroy_modelist(&fb_info->modelist);
1699 registered_fb[i] = NULL;
1700 num_registered_fb--;
1701 fb_cleanup_device(fb_info);
1702 event.info = fb_info;
1703 console_lock();
1704 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1705 console_unlock();
1706
1707 /* this may free fb info */
1708 put_fb_info(fb_info);
1709 return 0;
1710 }
1711
1712 int unlink_framebuffer(struct fb_info *fb_info)
1713 {
1714 int i;
1715
1716 i = fb_info->node;
1717 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1718 return -EINVAL;
1719
1720 if (fb_info->dev) {
1721 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1722 fb_info->dev = NULL;
1723 }
1724 return 0;
1725 }
1726 EXPORT_SYMBOL(unlink_framebuffer);
1727
1728 void remove_conflicting_framebuffers(struct apertures_struct *a,
1729 const char *name, bool primary)
1730 {
1731 mutex_lock(&registration_lock);
1732 do_remove_conflicting_framebuffers(a, name, primary);
1733 mutex_unlock(&registration_lock);
1734 }
1735 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1736
1737 /**
1738 * register_framebuffer - registers a frame buffer device
1739 * @fb_info: frame buffer info structure
1740 *
1741 * Registers a frame buffer device @fb_info.
1742 *
1743 * Returns negative errno on error, or zero for success.
1744 *
1745 */
1746 int
1747 register_framebuffer(struct fb_info *fb_info)
1748 {
1749 int ret;
1750
1751 mutex_lock(&registration_lock);
1752 ret = do_register_framebuffer(fb_info);
1753 mutex_unlock(&registration_lock);
1754
1755 return ret;
1756 }
1757 EXPORT_SYMBOL(register_framebuffer);
1758
1759 /**
1760 * unregister_framebuffer - releases a frame buffer device
1761 * @fb_info: frame buffer info structure
1762 *
1763 * Unregisters a frame buffer device @fb_info.
1764 *
1765 * Returns negative errno on error, or zero for success.
1766 *
1767 * This function will also notify the framebuffer console
1768 * to release the driver.
1769 *
1770 * This is meant to be called within a driver's module_exit()
1771 * function. If this is called outside module_exit(), ensure
1772 * that the driver implements fb_open() and fb_release() to
1773 * check that no processes are using the device.
1774 */
1775 int
1776 unregister_framebuffer(struct fb_info *fb_info)
1777 {
1778 int ret;
1779
1780 mutex_lock(&registration_lock);
1781 ret = do_unregister_framebuffer(fb_info);
1782 mutex_unlock(&registration_lock);
1783
1784 return ret;
1785 }
1786 EXPORT_SYMBOL(unregister_framebuffer);
1787
1788 /**
1789 * fb_set_suspend - low level driver signals suspend
1790 * @info: framebuffer affected
1791 * @state: 0 = resuming, !=0 = suspending
1792 *
1793 * This is meant to be used by low level drivers to
1794 * signal suspend/resume to the core & clients.
1795 * It must be called with the console semaphore held
1796 */
1797 void fb_set_suspend(struct fb_info *info, int state)
1798 {
1799 struct fb_event event;
1800
1801 event.info = info;
1802 if (state) {
1803 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1804 info->state = FBINFO_STATE_SUSPENDED;
1805 } else {
1806 info->state = FBINFO_STATE_RUNNING;
1807 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1808 }
1809 }
1810 EXPORT_SYMBOL(fb_set_suspend);
1811
1812 /**
1813 * fbmem_init - init frame buffer subsystem
1814 *
1815 * Initialize the frame buffer subsystem.
1816 *
1817 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1818 *
1819 */
1820
1821 static int __init
1822 fbmem_init(void)
1823 {
1824 proc_create("fb", 0, NULL, &fb_proc_fops);
1825
1826 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1827 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1828
1829 fb_class = class_create(THIS_MODULE, "graphics");
1830 if (IS_ERR(fb_class)) {
1831 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1832 fb_class = NULL;
1833 }
1834 return 0;
1835 }
1836
1837 #ifdef MODULE
1838 module_init(fbmem_init);
1839 static void __exit
1840 fbmem_exit(void)
1841 {
1842 remove_proc_entry("fb", NULL);
1843 class_destroy(fb_class);
1844 unregister_chrdev(FB_MAJOR, "fb");
1845 }
1846
1847 module_exit(fbmem_exit);
1848 MODULE_LICENSE("GPL");
1849 MODULE_DESCRIPTION("Framebuffer base");
1850 #else
1851 subsys_initcall(fbmem_init);
1852 #endif
1853
1854 int fb_new_modelist(struct fb_info *info)
1855 {
1856 struct fb_event event;
1857 struct fb_var_screeninfo var = info->var;
1858 struct list_head *pos, *n;
1859 struct fb_modelist *modelist;
1860 struct fb_videomode *m, mode;
1861 int err = 1;
1862
1863 list_for_each_safe(pos, n, &info->modelist) {
1864 modelist = list_entry(pos, struct fb_modelist, list);
1865 m = &modelist->mode;
1866 fb_videomode_to_var(&var, m);
1867 var.activate = FB_ACTIVATE_TEST;
1868 err = fb_set_var(info, &var);
1869 fb_var_to_videomode(&mode, &var);
1870 if (err || !fb_mode_is_equal(m, &mode)) {
1871 list_del(pos);
1872 kfree(pos);
1873 }
1874 }
1875
1876 err = 1;
1877
1878 if (!list_empty(&info->modelist)) {
1879 event.info = info;
1880 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1881 }
1882
1883 return err;
1884 }
1885
1886 static char *video_options[FB_MAX] __read_mostly;
1887 static int ofonly __read_mostly;
1888
1889 /**
1890 * fb_get_options - get kernel boot parameters
1891 * @name: framebuffer name as it would appear in
1892 * the boot parameter line
1893 * (video=<name>:<options>)
1894 * @option: the option will be stored here
1895 *
1896 * NOTE: Needed to maintain backwards compatibility
1897 */
1898 int fb_get_options(const char *name, char **option)
1899 {
1900 char *opt, *options = NULL;
1901 int retval = 0;
1902 int name_len = strlen(name), i;
1903
1904 if (name_len && ofonly && strncmp(name, "offb", 4))
1905 retval = 1;
1906
1907 if (name_len && !retval) {
1908 for (i = 0; i < FB_MAX; i++) {
1909 if (video_options[i] == NULL)
1910 continue;
1911 if (!video_options[i][0])
1912 continue;
1913 opt = video_options[i];
1914 if (!strncmp(name, opt, name_len) &&
1915 opt[name_len] == ':')
1916 options = opt + name_len + 1;
1917 }
1918 }
1919 if (options && !strncmp(options, "off", 3))
1920 retval = 1;
1921
1922 if (option)
1923 *option = options;
1924
1925 return retval;
1926 }
1927 EXPORT_SYMBOL(fb_get_options);
1928
1929 #ifndef MODULE
1930 /**
1931 * video_setup - process command line options
1932 * @options: string of options
1933 *
1934 * Process command line options for frame buffer subsystem.
1935 *
1936 * NOTE: This function is a __setup and __init function.
1937 * It only stores the options. Drivers have to call
1938 * fb_get_options() as necessary.
1939 *
1940 * Returns zero.
1941 *
1942 */
1943 static int __init video_setup(char *options)
1944 {
1945 int i, global = 0;
1946
1947 if (!options || !*options)
1948 global = 1;
1949
1950 if (!global && !strncmp(options, "ofonly", 6)) {
1951 ofonly = 1;
1952 global = 1;
1953 }
1954
1955 if (!global && !strchr(options, ':')) {
1956 fb_mode_option = options;
1957 global = 1;
1958 }
1959
1960 if (!global) {
1961 for (i = 0; i < FB_MAX; i++) {
1962 if (video_options[i] == NULL) {
1963 video_options[i] = options;
1964 break;
1965 }
1966
1967 }
1968 }
1969
1970 return 1;
1971 }
1972 __setup("video=", video_setup);
1973 #endif
1974
1975 MODULE_LICENSE("GPL");
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