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lh9ed821d2023-04-07 01:36:19 -07001/*
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
45static DEFINE_MUTEX(registration_lock);
46struct fb_info *registered_fb[FB_MAX] __read_mostly;
47int num_registered_fb __read_mostly;
48
49static struct fb_info *get_fb_info(unsigned int idx)
50{
51 struct fb_info *fb_info;
52
53 if (idx >= FB_MAX)
54 return ERR_PTR(-ENODEV);
55
56 mutex_lock(&registration_lock);
57 fb_info = registered_fb[idx];
58 if (fb_info)
59 atomic_inc(&fb_info->count);
60 mutex_unlock(&registration_lock);
61
62 return fb_info;
63}
64
65static void put_fb_info(struct fb_info *fb_info)
66{
67 if (!atomic_dec_and_test(&fb_info->count))
68 return;
69 if (fb_info->fbops->fb_destroy)
70 fb_info->fbops->fb_destroy(fb_info);
71}
72
73int lock_fb_info(struct fb_info *info)
74{
75 mutex_lock(&info->lock);
76 if (!info->fbops) {
77 mutex_unlock(&info->lock);
78 return 0;
79 }
80 return 1;
81}
82EXPORT_SYMBOL(lock_fb_info);
83
84/*
85 * Helpers
86 */
87
88int fb_get_color_depth(struct fb_var_screeninfo *var,
89 struct fb_fix_screeninfo *fix)
90{
91 int depth = 0;
92
93 if (fix->visual == FB_VISUAL_MONO01 ||
94 fix->visual == FB_VISUAL_MONO10)
95 depth = 1;
96 else {
97 if (var->green.length == var->blue.length &&
98 var->green.length == var->red.length &&
99 var->green.offset == var->blue.offset &&
100 var->green.offset == var->red.offset)
101 depth = var->green.length;
102 else
103 depth = var->green.length + var->red.length +
104 var->blue.length;
105 }
106
107 return depth;
108}
109EXPORT_SYMBOL(fb_get_color_depth);
110
111/*
112 * Data padding functions.
113 */
114void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
115{
116 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
117}
118EXPORT_SYMBOL(fb_pad_aligned_buffer);
119
120void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
121 u32 shift_high, u32 shift_low, u32 mod)
122{
123 u8 mask = (u8) (0xfff << shift_high), tmp;
124 int i, j;
125
126 for (i = height; i--; ) {
127 for (j = 0; j < idx; j++) {
128 tmp = dst[j];
129 tmp &= mask;
130 tmp |= *src >> shift_low;
131 dst[j] = tmp;
132 tmp = *src << shift_high;
133 dst[j+1] = tmp;
134 src++;
135 }
136 tmp = dst[idx];
137 tmp &= mask;
138 tmp |= *src >> shift_low;
139 dst[idx] = tmp;
140 if (shift_high < mod) {
141 tmp = *src << shift_high;
142 dst[idx+1] = tmp;
143 }
144 src++;
145 dst += d_pitch;
146 }
147}
148EXPORT_SYMBOL(fb_pad_unaligned_buffer);
149
150/*
151 * we need to lock this section since fb_cursor
152 * may use fb_imageblit()
153 */
154char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
155{
156 u32 align = buf->buf_align - 1, offset;
157 char *addr = buf->addr;
158
159 /* If IO mapped, we need to sync before access, no sharing of
160 * the pixmap is done
161 */
162 if (buf->flags & FB_PIXMAP_IO) {
163 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
164 info->fbops->fb_sync(info);
165 return addr;
166 }
167
168 /* See if we fit in the remaining pixmap space */
169 offset = buf->offset + align;
170 offset &= ~align;
171 if (offset + size > buf->size) {
172 /* We do not fit. In order to be able to re-use the buffer,
173 * we must ensure no asynchronous DMA'ing or whatever operation
174 * is in progress, we sync for that.
175 */
176 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
177 info->fbops->fb_sync(info);
178 offset = 0;
179 }
180 buf->offset = offset + size;
181 addr += offset;
182
183 return addr;
184}
185
186#ifdef CONFIG_LOGO
187
188static inline unsigned safe_shift(unsigned d, int n)
189{
190 return n < 0 ? d >> -n : d << n;
191}
192
193static void fb_set_logocmap(struct fb_info *info,
194 const struct linux_logo *logo)
195{
196 struct fb_cmap palette_cmap;
197 u16 palette_green[16];
198 u16 palette_blue[16];
199 u16 palette_red[16];
200 int i, j, n;
201 const unsigned char *clut = logo->clut;
202
203 palette_cmap.start = 0;
204 palette_cmap.len = 16;
205 palette_cmap.red = palette_red;
206 palette_cmap.green = palette_green;
207 palette_cmap.blue = palette_blue;
208 palette_cmap.transp = NULL;
209
210 for (i = 0; i < logo->clutsize; i += n) {
211 n = logo->clutsize - i;
212 /* palette_cmap provides space for only 16 colors at once */
213 if (n > 16)
214 n = 16;
215 palette_cmap.start = 32 + i;
216 palette_cmap.len = n;
217 for (j = 0; j < n; ++j) {
218 palette_cmap.red[j] = clut[0] << 8 | clut[0];
219 palette_cmap.green[j] = clut[1] << 8 | clut[1];
220 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
221 clut += 3;
222 }
223 fb_set_cmap(&palette_cmap, info);
224 }
225}
226
227static void fb_set_logo_truepalette(struct fb_info *info,
228 const struct linux_logo *logo,
229 u32 *palette)
230{
231 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
232 unsigned char redmask, greenmask, bluemask;
233 int redshift, greenshift, blueshift;
234 int i;
235 const unsigned char *clut = logo->clut;
236
237 /*
238 * We have to create a temporary palette since console palette is only
239 * 16 colors long.
240 */
241 /* Bug: Doesn't obey msb_right ... (who needs that?) */
242 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
243 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
244 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
245 redshift = info->var.red.offset - (8 - info->var.red.length);
246 greenshift = info->var.green.offset - (8 - info->var.green.length);
247 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
248
249 for ( i = 0; i < logo->clutsize; i++) {
250 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
251 safe_shift((clut[1] & greenmask), greenshift) |
252 safe_shift((clut[2] & bluemask), blueshift));
253 clut += 3;
254 }
255}
256
257static void fb_set_logo_directpalette(struct fb_info *info,
258 const struct linux_logo *logo,
259 u32 *palette)
260{
261 int redshift, greenshift, blueshift;
262 int i;
263
264 redshift = info->var.red.offset;
265 greenshift = info->var.green.offset;
266 blueshift = info->var.blue.offset;
267
268 for (i = 32; i < 32 + logo->clutsize; i++)
269 palette[i] = i << redshift | i << greenshift | i << blueshift;
270}
271
272static void fb_set_logo(struct fb_info *info,
273 const struct linux_logo *logo, u8 *dst,
274 int depth)
275{
276 int i, j, k;
277 const u8 *src = logo->data;
278 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
279 u8 fg = 1, d;
280
281 switch (fb_get_color_depth(&info->var, &info->fix)) {
282 case 1:
283 fg = 1;
284 break;
285 case 2:
286 fg = 3;
287 break;
288 default:
289 fg = 7;
290 break;
291 }
292
293 if (info->fix.visual == FB_VISUAL_MONO01 ||
294 info->fix.visual == FB_VISUAL_MONO10)
295 fg = ~((u8) (0xfff << info->var.green.length));
296
297 switch (depth) {
298 case 4:
299 for (i = 0; i < logo->height; i++)
300 for (j = 0; j < logo->width; src++) {
301 *dst++ = *src >> 4;
302 j++;
303 if (j < logo->width) {
304 *dst++ = *src & 0x0f;
305 j++;
306 }
307 }
308 break;
309 case 1:
310 for (i = 0; i < logo->height; i++) {
311 for (j = 0; j < logo->width; src++) {
312 d = *src ^ xor;
313 for (k = 7; k >= 0; k--) {
314 *dst++ = ((d >> k) & 1) ? fg : 0;
315 j++;
316 }
317 }
318 }
319 break;
320 }
321}
322
323/*
324 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
325 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
326 * the visual format and color depth of the framebuffer, the DAC, the
327 * pseudo_palette, and the logo data will be adjusted accordingly.
328 *
329 * Case 1 - linux_logo_clut224:
330 * Color exceeds the number of console colors (16), thus we set the hardware DAC
331 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
332 *
333 * For visuals that require color info from the pseudo_palette, we also construct
334 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
335 * will be set.
336 *
337 * Case 2 - linux_logo_vga16:
338 * The number of colors just matches the console colors, thus there is no need
339 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
340 * each byte contains color information for two pixels (upper and lower nibble).
341 * To be consistent with fb_imageblit() usage, we therefore separate the two
342 * nibbles into separate bytes. The "depth" flag will be set to 4.
343 *
344 * Case 3 - linux_logo_mono:
345 * This is similar with Case 2. Each byte contains information for 8 pixels.
346 * We isolate each bit and expand each into a byte. The "depth" flag will
347 * be set to 1.
348 */
349static struct logo_data {
350 int depth;
351 int needs_directpalette;
352 int needs_truepalette;
353 int needs_cmapreset;
354 const struct linux_logo *logo;
355} fb_logo __read_mostly;
356
357static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
358{
359 u32 size = width * height, i;
360
361 out += size - 1;
362
363 for (i = size; i--; )
364 *out-- = *in++;
365}
366
367static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
368{
369 int i, j, h = height - 1;
370
371 for (i = 0; i < height; i++)
372 for (j = 0; j < width; j++)
373 out[height * j + h - i] = *in++;
374}
375
376static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
377{
378 int i, j, w = width - 1;
379
380 for (i = 0; i < height; i++)
381 for (j = 0; j < width; j++)
382 out[height * (w - j) + i] = *in++;
383}
384
385static void fb_rotate_logo(struct fb_info *info, u8 *dst,
386 struct fb_image *image, int rotate)
387{
388 u32 tmp;
389
390 if (rotate == FB_ROTATE_UD) {
391 fb_rotate_logo_ud(image->data, dst, image->width,
392 image->height);
393 image->dx = info->var.xres - image->width - image->dx;
394 image->dy = info->var.yres - image->height - image->dy;
395 } else if (rotate == FB_ROTATE_CW) {
396 fb_rotate_logo_cw(image->data, dst, image->width,
397 image->height);
398 tmp = image->width;
399 image->width = image->height;
400 image->height = tmp;
401 tmp = image->dy;
402 image->dy = image->dx;
403 image->dx = info->var.xres - image->width - tmp;
404 } else if (rotate == FB_ROTATE_CCW) {
405 fb_rotate_logo_ccw(image->data, dst, image->width,
406 image->height);
407 tmp = image->width;
408 image->width = image->height;
409 image->height = tmp;
410 tmp = image->dx;
411 image->dx = image->dy;
412 image->dy = info->var.yres - image->height - tmp;
413 }
414
415 image->data = dst;
416}
417
418static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
419 int rotate, unsigned int num)
420{
421 unsigned int x;
422
423 if (rotate == FB_ROTATE_UR) {
424 for (x = 0;
425 x < num && image->dx + image->width <= info->var.xres;
426 x++) {
427 info->fbops->fb_imageblit(info, image);
428 image->dx += image->width + 8;
429 }
430 } else if (rotate == FB_ROTATE_UD) {
431 for (x = 0; x < num && image->dx >= 0; x++) {
432 info->fbops->fb_imageblit(info, image);
433 image->dx -= image->width + 8;
434 }
435 } else if (rotate == FB_ROTATE_CW) {
436 for (x = 0;
437 x < num && image->dy + image->height <= info->var.yres;
438 x++) {
439 info->fbops->fb_imageblit(info, image);
440 image->dy += image->height + 8;
441 }
442 } else if (rotate == FB_ROTATE_CCW) {
443 for (x = 0; x < num && image->dy >= 0; x++) {
444 info->fbops->fb_imageblit(info, image);
445 image->dy -= image->height + 8;
446 }
447 }
448}
449
450static int fb_show_logo_line(struct fb_info *info, int rotate,
451 const struct linux_logo *logo, int y,
452 unsigned int n)
453{
454 u32 *palette = NULL, *saved_pseudo_palette = NULL;
455 unsigned char *logo_new = NULL, *logo_rotate = NULL;
456 struct fb_image image;
457
458 /* Return if the frame buffer is not mapped or suspended */
459 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
460 info->flags & FBINFO_MODULE)
461 return 0;
462
463 image.depth = 8;
464 image.data = logo->data;
465
466 if (fb_logo.needs_cmapreset)
467 fb_set_logocmap(info, logo);
468
469 if (fb_logo.needs_truepalette ||
470 fb_logo.needs_directpalette) {
471 palette = kmalloc(256 * 4, GFP_KERNEL);
472 if (palette == NULL)
473 return 0;
474
475 if (fb_logo.needs_truepalette)
476 fb_set_logo_truepalette(info, logo, palette);
477 else
478 fb_set_logo_directpalette(info, logo, palette);
479
480 saved_pseudo_palette = info->pseudo_palette;
481 info->pseudo_palette = palette;
482 }
483
484 if (fb_logo.depth <= 4) {
485 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
486 if (logo_new == NULL) {
487 kfree(palette);
488 if (saved_pseudo_palette)
489 info->pseudo_palette = saved_pseudo_palette;
490 return 0;
491 }
492 image.data = logo_new;
493 fb_set_logo(info, logo, logo_new, fb_logo.depth);
494 }
495
496 image.dx = 0;
497 image.dy = y;
498 image.width = logo->width;
499 image.height = logo->height;
500
501 if (rotate) {
502 logo_rotate = kmalloc(logo->width *
503 logo->height, GFP_KERNEL);
504 if (logo_rotate)
505 fb_rotate_logo(info, logo_rotate, &image, rotate);
506 }
507
508 fb_do_show_logo(info, &image, rotate, n);
509
510 kfree(palette);
511 if (saved_pseudo_palette != NULL)
512 info->pseudo_palette = saved_pseudo_palette;
513 kfree(logo_new);
514 kfree(logo_rotate);
515 return logo->height;
516}
517
518
519#ifdef CONFIG_FB_LOGO_EXTRA
520
521#define FB_LOGO_EX_NUM_MAX 10
522static struct logo_data_extra {
523 const struct linux_logo *logo;
524 unsigned int n;
525} fb_logo_ex[FB_LOGO_EX_NUM_MAX];
526static unsigned int fb_logo_ex_num;
527
528void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
529{
530 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
531 return;
532
533 fb_logo_ex[fb_logo_ex_num].logo = logo;
534 fb_logo_ex[fb_logo_ex_num].n = n;
535 fb_logo_ex_num++;
536}
537
538static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
539 unsigned int yres)
540{
541 unsigned int i;
542
543 /* FIXME: logo_ex supports only truecolor fb. */
544 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
545 fb_logo_ex_num = 0;
546
547 for (i = 0; i < fb_logo_ex_num; i++) {
548 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
549 fb_logo_ex[i].logo = NULL;
550 continue;
551 }
552 height += fb_logo_ex[i].logo->height;
553 if (height > yres) {
554 height -= fb_logo_ex[i].logo->height;
555 fb_logo_ex_num = i;
556 break;
557 }
558 }
559 return height;
560}
561
562static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
563{
564 unsigned int i;
565
566 for (i = 0; i < fb_logo_ex_num; i++)
567 y += fb_show_logo_line(info, rotate,
568 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
569
570 return y;
571}
572
573#else /* !CONFIG_FB_LOGO_EXTRA */
574
575static inline int fb_prepare_extra_logos(struct fb_info *info,
576 unsigned int height,
577 unsigned int yres)
578{
579 return height;
580}
581
582static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
583{
584 return y;
585}
586
587#endif /* CONFIG_FB_LOGO_EXTRA */
588
589
590int fb_prepare_logo(struct fb_info *info, int rotate)
591{
592 int depth = fb_get_color_depth(&info->var, &info->fix);
593 unsigned int yres;
594
595 memset(&fb_logo, 0, sizeof(struct logo_data));
596
597 if (info->flags & FBINFO_MISC_TILEBLITTING ||
598 info->flags & FBINFO_MODULE)
599 return 0;
600
601 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
602 depth = info->var.blue.length;
603 if (info->var.red.length < depth)
604 depth = info->var.red.length;
605 if (info->var.green.length < depth)
606 depth = info->var.green.length;
607 }
608
609 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
610 /* assume console colormap */
611 depth = 4;
612 }
613
614 /* Return if no suitable logo was found */
615 fb_logo.logo = fb_find_logo(depth);
616
617 if (!fb_logo.logo) {
618 return 0;
619 }
620
621 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
622 yres = info->var.yres;
623 else
624 yres = info->var.xres;
625
626 if (fb_logo.logo->height > yres) {
627 fb_logo.logo = NULL;
628 return 0;
629 }
630
631 /* What depth we asked for might be different from what we get */
632 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
633 fb_logo.depth = 8;
634 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
635 fb_logo.depth = 4;
636 else
637 fb_logo.depth = 1;
638
639
640 if (fb_logo.depth > 4 && depth > 4) {
641 switch (info->fix.visual) {
642 case FB_VISUAL_TRUECOLOR:
643 fb_logo.needs_truepalette = 1;
644 break;
645 case FB_VISUAL_DIRECTCOLOR:
646 fb_logo.needs_directpalette = 1;
647 fb_logo.needs_cmapreset = 1;
648 break;
649 case FB_VISUAL_PSEUDOCOLOR:
650 fb_logo.needs_cmapreset = 1;
651 break;
652 }
653 }
654
655 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
656}
657
658int fb_show_logo(struct fb_info *info, int rotate)
659{
660 int y;
661
662 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
663 num_online_cpus());
664 y = fb_show_extra_logos(info, y, rotate);
665
666 return y;
667}
668#else
669int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
670int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
671#endif /* CONFIG_LOGO */
672
673static void *fb_seq_start(struct seq_file *m, loff_t *pos)
674{
675 mutex_lock(&registration_lock);
676 return (*pos < FB_MAX) ? pos : NULL;
677}
678
679static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
680{
681 (*pos)++;
682 return (*pos < FB_MAX) ? pos : NULL;
683}
684
685static void fb_seq_stop(struct seq_file *m, void *v)
686{
687 mutex_unlock(&registration_lock);
688}
689
690static int fb_seq_show(struct seq_file *m, void *v)
691{
692 int i = *(loff_t *)v;
693 struct fb_info *fi = registered_fb[i];
694
695 if (fi)
696 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
697 return 0;
698}
699
700static const struct seq_operations proc_fb_seq_ops = {
701 .start = fb_seq_start,
702 .next = fb_seq_next,
703 .stop = fb_seq_stop,
704 .show = fb_seq_show,
705};
706
707static int proc_fb_open(struct inode *inode, struct file *file)
708{
709 return seq_open(file, &proc_fb_seq_ops);
710}
711
712static const struct file_operations fb_proc_fops = {
713 .owner = THIS_MODULE,
714 .open = proc_fb_open,
715 .read = seq_read,
716 .llseek = seq_lseek,
717 .release = seq_release,
718};
719
720/*
721 * We hold a reference to the fb_info in file->private_data,
722 * but if the current registered fb has changed, we don't
723 * actually want to use it.
724 *
725 * So look up the fb_info using the inode minor number,
726 * and just verify it against the reference we have.
727 */
728static struct fb_info *file_fb_info(struct file *file)
729{
730 struct inode *inode = file->f_path.dentry->d_inode;
731 int fbidx = iminor(inode);
732 if(fbidx>= FB_MAX)
733 return NULL;
734
735 struct fb_info *info = registered_fb[fbidx];
736
737 if (info != file->private_data)
738 info = NULL;
739 return info;
740}
741
742static ssize_t
743fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
744{
745 unsigned long p = *ppos;
746 struct fb_info *info = file_fb_info(file);
747 u8 *buffer, *dst;
748 u8 __iomem *src;
749 int c, cnt = 0, err = 0;
750 unsigned long total_size;
751
752 if (!info || ! info->screen_base)
753 return -ENODEV;
754
755 if (info->state != FBINFO_STATE_RUNNING)
756 return -EPERM;
757
758 if (info->fbops->fb_read)
759 return info->fbops->fb_read(info, buf, count, ppos);
760
761 total_size = info->screen_size;
762
763 if (total_size == 0)
764 total_size = info->fix.smem_len;
765
766 if (p >= total_size)
767 return 0;
768
769 if (count >= total_size)
770 count = total_size;
771
772 if (count + p > total_size)
773 count = total_size - p;
774
775 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
776 GFP_KERNEL);
777 if (!buffer)
778 return -ENOMEM;
779
780 src = (u8 __iomem *) (info->screen_base + p);
781
782 if (info->fbops->fb_sync)
783 info->fbops->fb_sync(info);
784
785 while (count) {
786 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
787 dst = buffer;
788 fb_memcpy_fromfb(dst, src, c);
789 dst += c;
790 src += c;
791
792 if (copy_to_user(buf, buffer, c)) {
793 err = -EFAULT;
794 break;
795 }
796 *ppos += c;
797 buf += c;
798 cnt += c;
799 count -= c;
800 }
801
802 kfree(buffer);
803
804 return (err) ? err : cnt;
805}
806
807static ssize_t
808fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
809{
810 unsigned long p = *ppos;
811 struct fb_info *info = file_fb_info(file);
812 u8 *buffer, *src;
813 u8 __iomem *dst;
814 int c, cnt = 0, err = 0;
815 unsigned long total_size;
816
817 if (!info || !info->screen_base)
818 return -ENODEV;
819
820 if (info->state != FBINFO_STATE_RUNNING)
821 return -EPERM;
822
823 if (info->fbops->fb_write)
824 return info->fbops->fb_write(info, buf, count, ppos);
825
826 total_size = info->screen_size;
827
828 if (total_size == 0)
829 total_size = info->fix.smem_len;
830
831 if (p > total_size)
832 return -EFBIG;
833
834 if (count > total_size) {
835 err = -EFBIG;
836 count = total_size;
837 }
838
839 if (count + p > total_size) {
840 if (!err)
841 err = -ENOSPC;
842
843 count = total_size - p;
844 }
845
846 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
847 GFP_KERNEL);
848 if (!buffer)
849 return -ENOMEM;
850
851 dst = (u8 __iomem *) (info->screen_base + p);
852
853 if (info->fbops->fb_sync)
854 info->fbops->fb_sync(info);
855
856 while (count) {
857 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
858 src = buffer;
859
860 if (copy_from_user(src, buf, c)) {
861 err = -EFAULT;
862 break;
863 }
864
865 fb_memcpy_tofb(dst, src, c);
866 dst += c;
867 src += c;
868 *ppos += c;
869 buf += c;
870 cnt += c;
871 count -= c;
872 }
873
874 kfree(buffer);
875
876 return (cnt) ? cnt : err;
877}
878
879int
880fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
881{
882 struct fb_fix_screeninfo *fix = &info->fix;
883 unsigned int yres = info->var.yres;
884 int err = 0;
885
886 if (var->yoffset > 0) {
887 if (var->vmode & FB_VMODE_YWRAP) {
888 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
889 err = -EINVAL;
890 else
891 yres = 0;
892 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
893 err = -EINVAL;
894 }
895
896 if (var->xoffset > 0 && (!fix->xpanstep ||
897 (var->xoffset % fix->xpanstep)))
898 err = -EINVAL;
899
900 if (err || !info->fbops->fb_pan_display ||
901 var->yoffset > info->var.yres_virtual - yres ||
902 var->xoffset > info->var.xres_virtual - info->var.xres)
903 return -EINVAL;
904
905 if ((err = info->fbops->fb_pan_display(var, info)))
906 return err;
907 info->var.xoffset = var->xoffset;
908 info->var.yoffset = var->yoffset;
909 if (var->vmode & FB_VMODE_YWRAP)
910 info->var.vmode |= FB_VMODE_YWRAP;
911 else
912 info->var.vmode &= ~FB_VMODE_YWRAP;
913 return 0;
914}
915
916static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
917 u32 activate)
918{
919 struct fb_event event;
920 struct fb_blit_caps caps, fbcaps;
921 int err = 0;
922
923 memset(&caps, 0, sizeof(caps));
924 memset(&fbcaps, 0, sizeof(fbcaps));
925 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
926 event.info = info;
927 event.data = &caps;
928 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
929 info->fbops->fb_get_caps(info, &fbcaps, var);
930
931 if (((fbcaps.x ^ caps.x) & caps.x) ||
932 ((fbcaps.y ^ caps.y) & caps.y) ||
933 (fbcaps.len < caps.len))
934 err = -EINVAL;
935
936 return err;
937}
938
939int
940fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
941{
942 int flags = info->flags;
943 int ret = 0;
944
945 if (var->activate & FB_ACTIVATE_INV_MODE) {
946 struct fb_videomode mode1, mode2;
947
948 fb_var_to_videomode(&mode1, var);
949 fb_var_to_videomode(&mode2, &info->var);
950 /* make sure we don't delete the videomode of current var */
951 ret = fb_mode_is_equal(&mode1, &mode2);
952
953 if (!ret) {
954 struct fb_event event;
955
956 event.info = info;
957 event.data = &mode1;
958 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
959 }
960
961 if (!ret)
962 fb_delete_videomode(&mode1, &info->modelist);
963
964
965 ret = (ret) ? -EINVAL : 0;
966 goto done;
967 }
968
969 if ((var->activate & FB_ACTIVATE_FORCE) ||
970 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
971 u32 activate = var->activate;
972
973 /* When using FOURCC mode, make sure the red, green, blue and
974 * transp fields are set to 0.
975 */
976 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
977 var->grayscale > 1) {
978 if (var->red.offset || var->green.offset ||
979 var->blue.offset || var->transp.offset ||
980 var->red.length || var->green.length ||
981 var->blue.length || var->transp.length ||
982 var->red.msb_right || var->green.msb_right ||
983 var->blue.msb_right || var->transp.msb_right)
984 return -EINVAL;
985 }
986
987 if (!info->fbops->fb_check_var) {
988 *var = info->var;
989 goto done;
990 }
991
992 ret = info->fbops->fb_check_var(var, info);
993
994 if (ret)
995 goto done;
996
997 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
998 struct fb_var_screeninfo old_var;
999 struct fb_videomode mode;
1000
1001 if (info->fbops->fb_get_caps) {
1002 ret = fb_check_caps(info, var, activate);
1003
1004 if (ret)
1005 goto done;
1006 }
1007
1008 old_var = info->var;
1009 info->var = *var;
1010
1011 if (info->fbops->fb_set_par) {
1012 ret = info->fbops->fb_set_par(info);
1013
1014 if (ret) {
1015 info->var = old_var;
1016 printk(KERN_WARNING "detected "
1017 "fb_set_par error, "
1018 "error code: %d\n", ret);
1019 goto done;
1020 }
1021 }
1022
1023 fb_pan_display(info, &info->var);
1024 fb_set_cmap(&info->cmap, info);
1025 fb_var_to_videomode(&mode, &info->var);
1026
1027 if (info->modelist.prev && info->modelist.next &&
1028 !list_empty(&info->modelist))
1029 ret = fb_add_videomode(&mode, &info->modelist);
1030
1031 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1032 struct fb_event event;
1033 int evnt = (activate & FB_ACTIVATE_ALL) ?
1034 FB_EVENT_MODE_CHANGE_ALL :
1035 FB_EVENT_MODE_CHANGE;
1036
1037 info->flags &= ~FBINFO_MISC_USEREVENT;
1038 event.info = info;
1039 event.data = &mode;
1040 fb_notifier_call_chain(evnt, &event);
1041 }
1042 }
1043 }
1044
1045 done:
1046 return ret;
1047}
1048
1049int
1050fb_blank(struct fb_info *info, int blank)
1051{
1052 int ret = -EINVAL;
1053
1054 if (blank > FB_BLANK_POWERDOWN)
1055 blank = FB_BLANK_POWERDOWN;
1056
1057 if (info->fbops->fb_blank)
1058 ret = info->fbops->fb_blank(blank, info);
1059
1060 if (!ret) {
1061 struct fb_event event;
1062
1063 event.info = info;
1064 event.data = &blank;
1065 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1066 }
1067
1068 return ret;
1069}
1070
1071static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1072 unsigned long arg)
1073{
1074 struct fb_ops *fb;
1075 struct fb_var_screeninfo var;
1076 struct fb_fix_screeninfo fix;
1077 struct fb_con2fbmap con2fb;
1078 struct fb_cmap cmap_from;
1079 struct fb_cmap_user cmap;
1080 struct fb_event event;
1081 void __user *argp = (void __user *)arg;
1082 long ret = 0;
1083
1084 switch (cmd) {
1085 case FBIOGET_VSCREENINFO:
1086 if (!lock_fb_info(info))
1087 return -ENODEV;
1088 var = info->var;
1089 unlock_fb_info(info);
1090
1091 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1092 break;
1093 case FBIOPUT_VSCREENINFO:
1094 if (copy_from_user(&var, argp, sizeof(var)))
1095 return -EFAULT;
1096 if (!lock_fb_info(info))
1097 return -ENODEV;
1098 console_lock();
1099 info->flags |= FBINFO_MISC_USEREVENT;
1100 ret = fb_set_var(info, &var);
1101 info->flags &= ~FBINFO_MISC_USEREVENT;
1102 console_unlock();
1103 unlock_fb_info(info);
1104 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1105 ret = -EFAULT;
1106 break;
1107 case FBIOGET_FSCREENINFO:
1108 if (!lock_fb_info(info))
1109 return -ENODEV;
1110 fix = info->fix;
1111 unlock_fb_info(info);
1112
1113 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1114 break;
1115 #if 0
1116 case FBIOPUTCMAP:
1117 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1118 return -EFAULT;
1119 ret = fb_set_user_cmap(&cmap, info);
1120 break;
1121 case FBIOGETCMAP:
1122 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1123 return -EFAULT;
1124 if (!lock_fb_info(info))
1125 return -ENODEV;
1126 cmap_from = info->cmap;
1127 unlock_fb_info(info);
1128 ret = fb_cmap_to_user(&cmap_from, &cmap);
1129 break;
1130 #endif
1131
1132 case FBIOPAN_DISPLAY:
1133 if (copy_from_user(&var, argp, sizeof(var)))
1134 return -EFAULT;
1135 if (!lock_fb_info(info))
1136 return -ENODEV;
1137 console_lock();
1138 ret = fb_pan_display(info, &var);
1139 console_unlock();
1140 unlock_fb_info(info);
1141 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1142 return -EFAULT;
1143 break;
1144 case FBIO_CURSOR:
1145 ret = -EINVAL;
1146 break;
1147 case FBIOGET_CON2FBMAP:
1148 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1149 return -EFAULT;
1150 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1151 return -EINVAL;
1152 con2fb.framebuffer = -1;
1153 event.data = &con2fb;
1154 if (!lock_fb_info(info))
1155 return -ENODEV;
1156 event.info = info;
1157 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1158 unlock_fb_info(info);
1159 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1160 break;
1161 case FBIOPUT_CON2FBMAP:
1162 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1163 return -EFAULT;
1164 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1165 return -EINVAL;
1166 if (/*con2fb.framebuffer < 0 || */con2fb.framebuffer >= FB_MAX)
1167 return -EINVAL;
1168 if (!registered_fb[con2fb.framebuffer])
1169 request_module("fb%d", con2fb.framebuffer);
1170 if (!registered_fb[con2fb.framebuffer]) {
1171 ret = -EINVAL;
1172 break;
1173 }
1174 event.data = &con2fb;
1175 if (!lock_fb_info(info))
1176 return -ENODEV;
1177 console_lock();
1178 event.info = info;
1179 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1180 console_unlock();
1181 unlock_fb_info(info);
1182 break;
1183 case FBIOBLANK:
1184 if (!lock_fb_info(info))
1185 return -ENODEV;
1186 console_lock();
1187 info->flags |= FBINFO_MISC_USEREVENT;
1188 ret = fb_blank(info, arg);
1189 info->flags &= ~FBINFO_MISC_USEREVENT;
1190 console_unlock();
1191 unlock_fb_info(info);
1192 break;
1193 default:
1194 if (!lock_fb_info(info))
1195 return -ENODEV;
1196 fb = info->fbops;
1197 if (fb->fb_ioctl)
1198 ret = fb->fb_ioctl(info, cmd, arg);
1199 else
1200 ret = -ENOTTY;
1201 unlock_fb_info(info);
1202 }
1203 return ret;
1204}
1205
1206static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1207{
1208 struct fb_info *info = file_fb_info(file);
1209
1210 if (!info)
1211 return -ENODEV;
1212 return do_fb_ioctl(info, cmd, arg);
1213}
1214
1215#ifdef CONFIG_COMPAT
1216struct fb_fix_screeninfo32 {
1217 char id[16];
1218 compat_caddr_t smem_start;
1219 u32 smem_len;
1220 u32 type;
1221 u32 type_aux;
1222 u32 visual;
1223 u16 xpanstep;
1224 u16 ypanstep;
1225 u16 ywrapstep;
1226 u32 line_length;
1227 compat_caddr_t mmio_start;
1228 u32 mmio_len;
1229 u32 accel;
1230 u16 reserved[3];
1231};
1232
1233struct fb_cmap32 {
1234 u32 start;
1235 u32 len;
1236 compat_caddr_t red;
1237 compat_caddr_t green;
1238 compat_caddr_t blue;
1239 compat_caddr_t transp;
1240};
1241
1242static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1243 unsigned long arg)
1244{
1245 struct fb_cmap_user __user *cmap;
1246 struct fb_cmap32 __user *cmap32;
1247 __u32 data;
1248 int err;
1249
1250 cmap = compat_alloc_user_space(sizeof(*cmap));
1251 cmap32 = compat_ptr(arg);
1252
1253 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1254 return -EFAULT;
1255
1256 if (get_user(data, &cmap32->red) ||
1257 put_user(compat_ptr(data), &cmap->red) ||
1258 get_user(data, &cmap32->green) ||
1259 put_user(compat_ptr(data), &cmap->green) ||
1260 get_user(data, &cmap32->blue) ||
1261 put_user(compat_ptr(data), &cmap->blue) ||
1262 get_user(data, &cmap32->transp) ||
1263 put_user(compat_ptr(data), &cmap->transp))
1264 return -EFAULT;
1265
1266 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1267
1268 if (!err) {
1269 if (copy_in_user(&cmap32->start,
1270 &cmap->start,
1271 2 * sizeof(__u32)))
1272 err = -EFAULT;
1273 }
1274 return err;
1275}
1276
1277static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1278 struct fb_fix_screeninfo32 __user *fix32)
1279{
1280 __u32 data;
1281 int err;
1282
1283 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1284
1285 data = (__u32) (unsigned long) fix->smem_start;
1286 err |= put_user(data, &fix32->smem_start);
1287
1288 err |= put_user(fix->smem_len, &fix32->smem_len);
1289 err |= put_user(fix->type, &fix32->type);
1290 err |= put_user(fix->type_aux, &fix32->type_aux);
1291 err |= put_user(fix->visual, &fix32->visual);
1292 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1293 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1294 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1295 err |= put_user(fix->line_length, &fix32->line_length);
1296
1297 data = (__u32) (unsigned long) fix->mmio_start;
1298 err |= put_user(data, &fix32->mmio_start);
1299
1300 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1301 err |= put_user(fix->accel, &fix32->accel);
1302 err |= copy_to_user(fix32->reserved, fix->reserved,
1303 sizeof(fix->reserved));
1304
1305 return err;
1306}
1307
1308static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1309 unsigned long arg)
1310{
1311 mm_segment_t old_fs;
1312 struct fb_fix_screeninfo fix;
1313 struct fb_fix_screeninfo32 __user *fix32;
1314 int err;
1315
1316 fix32 = compat_ptr(arg);
1317
1318 old_fs = get_fs();
1319 set_fs(KERNEL_DS);
1320 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1321 set_fs(old_fs);
1322
1323 if (!err)
1324 err = do_fscreeninfo_to_user(&fix, fix32);
1325
1326 return err;
1327}
1328
1329static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1330 unsigned long arg)
1331{
1332 struct fb_info *info = file_fb_info(file);
1333 struct fb_ops *fb;
1334 long ret = -ENOIOCTLCMD;
1335
1336 if (!info)
1337 return -ENODEV;
1338 fb = info->fbops;
1339 switch(cmd) {
1340 case FBIOGET_VSCREENINFO:
1341 case FBIOPUT_VSCREENINFO:
1342 case FBIOPAN_DISPLAY:
1343 case FBIOGET_CON2FBMAP:
1344 case FBIOPUT_CON2FBMAP:
1345 arg = (unsigned long) compat_ptr(arg);
1346 case FBIOBLANK:
1347 ret = do_fb_ioctl(info, cmd, arg);
1348 break;
1349
1350 case FBIOGET_FSCREENINFO:
1351 ret = fb_get_fscreeninfo(info, cmd, arg);
1352 break;
1353
1354 case FBIOGETCMAP:
1355 case FBIOPUTCMAP:
1356 ret = fb_getput_cmap(info, cmd, arg);
1357 break;
1358
1359 default:
1360 if (fb->fb_compat_ioctl)
1361 ret = fb->fb_compat_ioctl(info, cmd, arg);
1362 break;
1363 }
1364 return ret;
1365}
1366#endif
1367
1368static int
1369fb_mmap(struct file *file, struct vm_area_struct * vma)
1370{
1371 struct fb_info *info = file_fb_info(file);
1372 struct fb_ops *fb;
1373 unsigned long mmio_pgoff;
1374 unsigned long start;
1375 u32 len;
1376
1377 if (!info)
1378 return -ENODEV;
1379 fb = info->fbops;
1380 if (!fb)
1381 return -ENODEV;
1382 mutex_lock(&info->mm_lock);
1383 if (fb->fb_mmap) {
1384 int res;
1385 res = fb->fb_mmap(info, vma);
1386 mutex_unlock(&info->mm_lock);
1387 return res;
1388 }
1389
1390 /*
1391 * Ugh. This can be either the frame buffer mapping, or
1392 * if pgoff points past it, the mmio mapping.
1393 */
1394 start = info->fix.smem_start;
1395 len = info->fix.smem_len;
1396 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1397 if (vma->vm_pgoff >= mmio_pgoff) {
1398 vma->vm_pgoff -= mmio_pgoff;
1399 start = info->fix.mmio_start;
1400 len = info->fix.mmio_len;
1401 }
1402 mutex_unlock(&info->mm_lock);
1403
1404 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1405 fb_pgprotect(file, vma, start);
1406
1407 return vm_iomap_memory(vma, start, len);
1408}
1409
1410static int
1411fb_open(struct inode *inode, struct file *file)
1412__acquires(&info->lock)
1413__releases(&info->lock)
1414{
1415 int fbidx = iminor(inode);
1416 struct fb_info *info;
1417 int res = 0;
1418
1419 info = get_fb_info(fbidx);
1420 if (!info) {
1421 request_module("fb%d", fbidx);
1422 info = get_fb_info(fbidx);
1423 if (!info)
1424 return -ENODEV;
1425 }
1426 if (IS_ERR(info))
1427 return PTR_ERR(info);
1428
1429 mutex_lock(&info->lock);
1430 if (!try_module_get(info->fbops->owner)) {
1431 res = -ENODEV;
1432 goto out;
1433 }
1434 file->private_data = info;
1435 if (info->fbops->fb_open) {
1436 res = info->fbops->fb_open(info,1);
1437 if (res)
1438 module_put(info->fbops->owner);
1439 }
1440#ifdef CONFIG_FB_DEFERRED_IO
1441 if (info->fbdefio)
1442 fb_deferred_io_open(info, inode, file);
1443#endif
1444out:
1445 mutex_unlock(&info->lock);
1446 if (res)
1447 put_fb_info(info);
1448 return res;
1449}
1450
1451static int
1452fb_release(struct inode *inode, struct file *file)
1453__acquires(&info->lock)
1454__releases(&info->lock)
1455{
1456 struct fb_info * const info = file->private_data;
1457
1458 mutex_lock(&info->lock);
1459 if (info->fbops->fb_release)
1460 info->fbops->fb_release(info,1);
1461 module_put(info->fbops->owner);
1462 mutex_unlock(&info->lock);
1463 put_fb_info(info);
1464 return 0;
1465}
1466
1467static const struct file_operations fb_fops = {
1468 .owner = THIS_MODULE,
1469 .read = fb_read,
1470 .write = fb_write,
1471 .unlocked_ioctl = fb_ioctl,
1472#ifdef CONFIG_COMPAT
1473 .compat_ioctl = fb_compat_ioctl,
1474#endif
1475 .mmap = fb_mmap,
1476 .open = fb_open,
1477 .release = fb_release,
1478#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1479 .get_unmapped_area = get_fb_unmapped_area,
1480#endif
1481#ifdef CONFIG_FB_DEFERRED_IO
1482 .fsync = fb_deferred_io_fsync,
1483#endif
1484 .llseek = default_llseek,
1485};
1486
1487struct class *fb_class;
1488EXPORT_SYMBOL(fb_class);
1489
1490static int fb_check_foreignness(struct fb_info *fi)
1491{
1492 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1493
1494 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1495
1496#ifdef __BIG_ENDIAN
1497 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1498#else
1499 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1500#endif /* __BIG_ENDIAN */
1501
1502 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1503 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1504 "support this framebuffer\n", fi->fix.id);
1505 return -ENOSYS;
1506 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1507 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1508 "support this framebuffer\n", fi->fix.id);
1509 return -ENOSYS;
1510 }
1511
1512 return 0;
1513}
1514
1515static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1516{
1517 /* is the generic aperture base the same as the HW one */
1518 if (gen->base == hw->base)
1519 return true;
1520 /* is the generic aperture base inside the hw base->hw base+size */
1521 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1522 return true;
1523 return false;
1524}
1525
1526static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1527 struct apertures_struct *hwa)
1528{
1529 int i, j;
1530 if (!hwa || !gena)
1531 return false;
1532
1533 for (i = 0; i < hwa->count; ++i) {
1534 struct aperture *h = &hwa->ranges[i];
1535 for (j = 0; j < gena->count; ++j) {
1536 struct aperture *g = &gena->ranges[j];
1537 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1538 (unsigned long long)g->base,
1539 (unsigned long long)g->size,
1540 (unsigned long long)h->base,
1541 (unsigned long long)h->size);
1542 if (apertures_overlap(g, h))
1543 return true;
1544 }
1545 }
1546
1547 return false;
1548}
1549
1550static int do_unregister_framebuffer(struct fb_info *fb_info);
1551
1552#define VGA_FB_PHYS 0xA0000
1553static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1554 const char *name, bool primary)
1555{
1556 int i;
1557
1558 /* check all firmware fbs and kick off if the base addr overlaps */
1559 for (i = 0 ; i < FB_MAX; i++) {
1560 struct apertures_struct *gen_aper;
1561 if (!registered_fb[i])
1562 continue;
1563
1564 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1565 continue;
1566
1567 gen_aper = registered_fb[i]->apertures;
1568 if (fb_do_apertures_overlap(gen_aper, a) ||
1569 (primary && gen_aper && gen_aper->count &&
1570 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1571
1572 printk(KERN_INFO "fb: conflicting fb hw usage "
1573 "%s vs %s - removing generic driver\n",
1574 name, registered_fb[i]->fix.id);
1575 do_unregister_framebuffer(registered_fb[i]);
1576 }
1577 }
1578}
1579
1580static int do_register_framebuffer(struct fb_info *fb_info)
1581{
1582 int i;
1583 struct fb_event event;
1584 struct fb_videomode mode;
1585
1586 if (fb_check_foreignness(fb_info))
1587 return -ENOSYS;
1588
1589 do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1590 fb_is_primary_device(fb_info));
1591
1592 if (num_registered_fb == FB_MAX)
1593 return -ENXIO;
1594
1595 num_registered_fb++;
1596 for (i = 0 ; i < FB_MAX; i++)
1597 if (!registered_fb[i])
1598 break;
1599 if(i >= FB_MAX)
1600 return -EINVAL;
1601
1602 fb_info->node = i;
1603 atomic_set(&fb_info->count, 1);
1604 mutex_init(&fb_info->lock);
1605 mutex_init(&fb_info->mm_lock);
1606
1607 fb_info->dev = device_create(fb_class, fb_info->device,
1608 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1609 if (IS_ERR(fb_info->dev)) {
1610 /* Not fatal */
1611 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1612 fb_info->dev = NULL;
1613 } else
1614 fb_init_device(fb_info);
1615
1616 if (fb_info->pixmap.addr == NULL) {
1617 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1618 if (fb_info->pixmap.addr) {
1619 fb_info->pixmap.size = FBPIXMAPSIZE;
1620 fb_info->pixmap.buf_align = 1;
1621 fb_info->pixmap.scan_align = 1;
1622 fb_info->pixmap.access_align = 32;
1623 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1624 }
1625 }
1626 fb_info->pixmap.offset = 0;
1627
1628 if (!fb_info->pixmap.blit_x)
1629 fb_info->pixmap.blit_x = ~(u32)0;
1630
1631 if (!fb_info->pixmap.blit_y)
1632 fb_info->pixmap.blit_y = ~(u32)0;
1633
1634 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1635 INIT_LIST_HEAD(&fb_info->modelist);
1636
1637 fb_var_to_videomode(&mode, &fb_info->var);
1638 fb_add_videomode(&mode, &fb_info->modelist);
1639 registered_fb[i] = fb_info;
1640
1641 event.info = fb_info;
1642 if (!lock_fb_info(fb_info))
1643 return -ENODEV;
1644 console_lock();
1645 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1646 console_unlock();
1647 unlock_fb_info(fb_info);
1648 return 0;
1649}
1650
1651static int do_unregister_framebuffer(struct fb_info *fb_info)
1652{
1653 struct fb_event event;
1654 int i, ret = 0;
1655
1656 i = fb_info->node;
1657 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1658 return -EINVAL;
1659
1660 if (!lock_fb_info(fb_info))
1661 return -ENODEV;
1662 console_lock();
1663 event.info = fb_info;
1664 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1665 console_unlock();
1666 unlock_fb_info(fb_info);
1667
1668 if (ret)
1669 return -EINVAL;
1670
1671 unlink_framebuffer(fb_info);
1672 if (fb_info->pixmap.addr &&
1673 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1674 kfree(fb_info->pixmap.addr);
1675 fb_destroy_modelist(&fb_info->modelist);
1676 registered_fb[i] = NULL;
1677 num_registered_fb--;
1678 fb_cleanup_device(fb_info);
1679 event.info = fb_info;
1680 console_lock();
1681 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1682 console_unlock();
1683
1684 /* this may free fb info */
1685 put_fb_info(fb_info);
1686 return 0;
1687}
1688
1689int unlink_framebuffer(struct fb_info *fb_info)
1690{
1691 int i;
1692
1693 i = fb_info->node;
1694 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1695 return -EINVAL;
1696
1697 if (fb_info->dev) {
1698 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1699 fb_info->dev = NULL;
1700 }
1701 return 0;
1702}
1703EXPORT_SYMBOL(unlink_framebuffer);
1704
1705void remove_conflicting_framebuffers(struct apertures_struct *a,
1706 const char *name, bool primary)
1707{
1708 mutex_lock(&registration_lock);
1709 do_remove_conflicting_framebuffers(a, name, primary);
1710 mutex_unlock(&registration_lock);
1711}
1712EXPORT_SYMBOL(remove_conflicting_framebuffers);
1713
1714/**
1715 * register_framebuffer - registers a frame buffer device
1716 * @fb_info: frame buffer info structure
1717 *
1718 * Registers a frame buffer device @fb_info.
1719 *
1720 * Returns negative errno on error, or zero for success.
1721 *
1722 */
1723int
1724register_framebuffer(struct fb_info *fb_info)
1725{
1726 int ret;
1727
1728 mutex_lock(&registration_lock);
1729 ret = do_register_framebuffer(fb_info);
1730 mutex_unlock(&registration_lock);
1731
1732 return ret;
1733}
1734
1735/**
1736 * unregister_framebuffer - releases a frame buffer device
1737 * @fb_info: frame buffer info structure
1738 *
1739 * Unregisters a frame buffer device @fb_info.
1740 *
1741 * Returns negative errno on error, or zero for success.
1742 *
1743 * This function will also notify the framebuffer console
1744 * to release the driver.
1745 *
1746 * This is meant to be called within a driver's module_exit()
1747 * function. If this is called outside module_exit(), ensure
1748 * that the driver implements fb_open() and fb_release() to
1749 * check that no processes are using the device.
1750 */
1751int
1752unregister_framebuffer(struct fb_info *fb_info)
1753{
1754 int ret;
1755
1756 mutex_lock(&registration_lock);
1757 ret = do_unregister_framebuffer(fb_info);
1758 mutex_unlock(&registration_lock);
1759
1760 return ret;
1761}
1762
1763/**
1764 * fb_set_suspend - low level driver signals suspend
1765 * @info: framebuffer affected
1766 * @state: 0 = resuming, !=0 = suspending
1767 *
1768 * This is meant to be used by low level drivers to
1769 * signal suspend/resume to the core & clients.
1770 * It must be called with the console semaphore held
1771 */
1772void fb_set_suspend(struct fb_info *info, int state)
1773{
1774 struct fb_event event;
1775
1776 event.info = info;
1777 if (state) {
1778 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1779 info->state = FBINFO_STATE_SUSPENDED;
1780 } else {
1781 info->state = FBINFO_STATE_RUNNING;
1782 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1783 }
1784}
1785
1786/**
1787 * fbmem_init - init frame buffer subsystem
1788 *
1789 * Initialize the frame buffer subsystem.
1790 *
1791 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1792 *
1793 */
1794
1795static int __init
1796fbmem_init(void)
1797{
1798 proc_create("fb", 0, NULL, &fb_proc_fops);
1799
1800 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1801 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1802
1803 fb_class = class_create(THIS_MODULE, "graphics");
1804 if (IS_ERR(fb_class)) {
1805 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1806 fb_class = NULL;
1807 }
1808 return 0;
1809}
1810
1811#ifdef MODULE
1812module_init(fbmem_init);
1813static void __exit
1814fbmem_exit(void)
1815{
1816 remove_proc_entry("fb", NULL);
1817 class_destroy(fb_class);
1818 unregister_chrdev(FB_MAJOR, "fb");
1819}
1820
1821module_exit(fbmem_exit);
1822MODULE_LICENSE("GPL");
1823MODULE_DESCRIPTION("Framebuffer base");
1824#else
1825subsys_initcall(fbmem_init);
1826#endif
1827
1828int fb_new_modelist(struct fb_info *info)
1829{
1830 struct fb_event event;
1831 struct fb_var_screeninfo var = info->var;
1832 struct list_head *pos, *n;
1833 struct fb_modelist *modelist;
1834 struct fb_videomode *m, mode;
1835 int err = 1;
1836
1837 list_for_each_safe(pos, n, &info->modelist) {
1838 modelist = list_entry(pos, struct fb_modelist, list);
1839 m = &modelist->mode;
1840 fb_videomode_to_var(&var, m);
1841 var.activate = FB_ACTIVATE_TEST;
1842 err = fb_set_var(info, &var);
1843 fb_var_to_videomode(&mode, &var);
1844 if (err || !fb_mode_is_equal(m, &mode)) {
1845 list_del(pos);
1846 kfree(pos);
1847 }
1848 }
1849
1850 err = 1;
1851
1852 if (!list_empty(&info->modelist)) {
1853 event.info = info;
1854 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1855 }
1856
1857 return err;
1858}
1859
1860static char *video_options[FB_MAX] __read_mostly;
1861static int ofonly __read_mostly;
1862
1863/**
1864 * fb_get_options - get kernel boot parameters
1865 * @name: framebuffer name as it would appear in
1866 * the boot parameter line
1867 * (video=<name>:<options>)
1868 * @option: the option will be stored here
1869 *
1870 * NOTE: Needed to maintain backwards compatibility
1871 */
1872int fb_get_options(char *name, char **option)
1873{
1874 char *opt, *options = NULL;
1875 int retval = 0;
1876 int name_len = strlen(name), i;
1877
1878 if (name_len && ofonly && strncmp(name, "offb", 4))
1879 retval = 1;
1880
1881 if (name_len && !retval) {
1882 for (i = 0; i < FB_MAX; i++) {
1883 if (video_options[i] == NULL)
1884 continue;
1885 if (!video_options[i][0])
1886 continue;
1887 opt = video_options[i];
1888 if (!strncmp(name, opt, name_len) &&
1889 opt[name_len] == ':')
1890 options = opt + name_len + 1;
1891 }
1892 }
1893 if (options && !strncmp(options, "off", 3))
1894 retval = 1;
1895
1896 if (option)
1897 *option = options;
1898
1899 return retval;
1900}
1901
1902#ifndef MODULE
1903/**
1904 * video_setup - process command line options
1905 * @options: string of options
1906 *
1907 * Process command line options for frame buffer subsystem.
1908 *
1909 * NOTE: This function is a __setup and __init function.
1910 * It only stores the options. Drivers have to call
1911 * fb_get_options() as necessary.
1912 *
1913 * Returns zero.
1914 *
1915 */
1916static int __init video_setup(char *options)
1917{
1918 int i, global = 0;
1919
1920 if (!options || !*options)
1921 global = 1;
1922
1923 if (!global && !strncmp(options, "ofonly", 6)) {
1924 ofonly = 1;
1925 global = 1;
1926 }
1927
1928 if (!global && !strchr(options, ':')) {
1929 fb_mode_option = options;
1930 global = 1;
1931 }
1932
1933 if (!global) {
1934 for (i = 0; i < FB_MAX; i++) {
1935 if (video_options[i] == NULL) {
1936 video_options[i] = options;
1937 break;
1938 }
1939
1940 }
1941 }
1942
1943 return 1;
1944}
1945__setup("video=", video_setup);
1946#endif
1947
1948 /*
1949 * Visible symbols for modules
1950 */
1951
1952EXPORT_SYMBOL(register_framebuffer);
1953EXPORT_SYMBOL(unregister_framebuffer);
1954EXPORT_SYMBOL(num_registered_fb);
1955EXPORT_SYMBOL(registered_fb);
1956EXPORT_SYMBOL(fb_show_logo);
1957EXPORT_SYMBOL(fb_set_var);
1958EXPORT_SYMBOL(fb_blank);
1959EXPORT_SYMBOL(fb_pan_display);
1960EXPORT_SYMBOL(fb_get_buffer_offset);
1961EXPORT_SYMBOL(fb_set_suspend);
1962EXPORT_SYMBOL(fb_get_options);
1963
1964MODULE_LICENSE("GPL");