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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmem.c
blob756efeb91abc09bc3635387840f2b686f724d1fc
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/smp_lock.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/mman.h>
25 #include <linux/vt.h>
26 #include <linux/init.h>
27 #include <linux/linux_logo.h>
28 #include <linux/proc_fs.h>
29 #include <linux/seq_file.h>
30 #include <linux/console.h>
31 #include <linux/kmod.h>
32 #include <linux/err.h>
33 #include <linux/device.h>
34 #include <linux/efi.h>
35 #include <linux/fb.h>
36
37 #include <asm/fb.h>
38
39
40 /*
41 * Frame buffer device initialization and setup routines
42 */
43
44 #define FBPIXMAPSIZE (1024 * 8)
45
46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
47 int num_registered_fb __read_mostly;
48
49 /*
50 * Helpers
51 */
52
53 int fb_get_color_depth(struct fb_var_screeninfo *var,
54 struct fb_fix_screeninfo *fix)
55 {
56 int depth = 0;
57
58 if (fix->visual == FB_VISUAL_MONO01 ||
59 fix->visual == FB_VISUAL_MONO10)
60 depth = 1;
61 else {
62 if (var->green.length == var->blue.length &&
63 var->green.length == var->red.length &&
64 var->green.offset == var->blue.offset &&
65 var->green.offset == var->red.offset)
66 depth = var->green.length;
67 else
68 depth = var->green.length + var->red.length +
69 var->blue.length;
70 }
71
72 return depth;
73 }
74 EXPORT_SYMBOL(fb_get_color_depth);
75
76 /*
77 * Data padding functions.
78 */
79 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
80 {
81 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
82 }
83 EXPORT_SYMBOL(fb_pad_aligned_buffer);
84
85 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
86 u32 shift_high, u32 shift_low, u32 mod)
87 {
88 u8 mask = (u8) (0xfff << shift_high), tmp;
89 int i, j;
90
91 for (i = height; i--; ) {
92 for (j = 0; j < idx; j++) {
93 tmp = dst[j];
94 tmp &= mask;
95 tmp |= *src >> shift_low;
96 dst[j] = tmp;
97 tmp = *src << shift_high;
98 dst[j+1] = tmp;
99 src++;
100 }
101 tmp = dst[idx];
102 tmp &= mask;
103 tmp |= *src >> shift_low;
104 dst[idx] = tmp;
105 if (shift_high < mod) {
106 tmp = *src << shift_high;
107 dst[idx+1] = tmp;
108 }
109 src++;
110 dst += d_pitch;
111 }
112 }
113 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
114
115 /*
116 * we need to lock this section since fb_cursor
117 * may use fb_imageblit()
118 */
119 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
120 {
121 u32 align = buf->buf_align - 1, offset;
122 char *addr = buf->addr;
123
124 /* If IO mapped, we need to sync before access, no sharing of
125 * the pixmap is done
126 */
127 if (buf->flags & FB_PIXMAP_IO) {
128 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
129 info->fbops->fb_sync(info);
130 return addr;
131 }
132
133 /* See if we fit in the remaining pixmap space */
134 offset = buf->offset + align;
135 offset &= ~align;
136 if (offset + size > buf->size) {
137 /* We do not fit. In order to be able to re-use the buffer,
138 * we must ensure no asynchronous DMA'ing or whatever operation
139 * is in progress, we sync for that.
140 */
141 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142 info->fbops->fb_sync(info);
143 offset = 0;
144 }
145 buf->offset = offset + size;
146 addr += offset;
147
148 return addr;
149 }
150
151 #ifdef CONFIG_LOGO
152
153 static inline unsigned safe_shift(unsigned d, int n)
154 {
155 return n < 0 ? d >> -n : d << n;
156 }
157
158 static void fb_set_logocmap(struct fb_info *info,
159 const struct linux_logo *logo)
160 {
161 struct fb_cmap palette_cmap;
162 u16 palette_green[16];
163 u16 palette_blue[16];
164 u16 palette_red[16];
165 int i, j, n;
166 const unsigned char *clut = logo->clut;
167
168 palette_cmap.start = 0;
169 palette_cmap.len = 16;
170 palette_cmap.red = palette_red;
171 palette_cmap.green = palette_green;
172 palette_cmap.blue = palette_blue;
173 palette_cmap.transp = NULL;
174
175 for (i = 0; i < logo->clutsize; i += n) {
176 n = logo->clutsize - i;
177 /* palette_cmap provides space for only 16 colors at once */
178 if (n > 16)
179 n = 16;
180 palette_cmap.start = 32 + i;
181 palette_cmap.len = n;
182 for (j = 0; j < n; ++j) {
183 palette_cmap.red[j] = clut[0] << 8 | clut[0];
184 palette_cmap.green[j] = clut[1] << 8 | clut[1];
185 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
186 clut += 3;
187 }
188 fb_set_cmap(&palette_cmap, info);
189 }
190 }
191
192 static void fb_set_logo_truepalette(struct fb_info *info,
193 const struct linux_logo *logo,
194 u32 *palette)
195 {
196 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
197 unsigned char redmask, greenmask, bluemask;
198 int redshift, greenshift, blueshift;
199 int i;
200 const unsigned char *clut = logo->clut;
201
202 /*
203 * We have to create a temporary palette since console palette is only
204 * 16 colors long.
205 */
206 /* Bug: Doesn't obey msb_right ... (who needs that?) */
207 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
208 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
209 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
210 redshift = info->var.red.offset - (8 - info->var.red.length);
211 greenshift = info->var.green.offset - (8 - info->var.green.length);
212 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
213
214 for ( i = 0; i < logo->clutsize; i++) {
215 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
216 safe_shift((clut[1] & greenmask), greenshift) |
217 safe_shift((clut[2] & bluemask), blueshift));
218 clut += 3;
219 }
220 }
221
222 static void fb_set_logo_directpalette(struct fb_info *info,
223 const struct linux_logo *logo,
224 u32 *palette)
225 {
226 int redshift, greenshift, blueshift;
227 int i;
228
229 redshift = info->var.red.offset;
230 greenshift = info->var.green.offset;
231 blueshift = info->var.blue.offset;
232
233 for (i = 32; i < 32 + logo->clutsize; i++)
234 palette[i] = i << redshift | i << greenshift | i << blueshift;
235 }
236
237 static void fb_set_logo(struct fb_info *info,
238 const struct linux_logo *logo, u8 *dst,
239 int depth)
240 {
241 int i, j, k;
242 const u8 *src = logo->data;
243 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
244 u8 fg = 1, d;
245
246 switch (fb_get_color_depth(&info->var, &info->fix)) {
247 case 1:
248 fg = 1;
249 break;
250 case 2:
251 fg = 3;
252 break;
253 default:
254 fg = 7;
255 break;
256 }
257
258 if (info->fix.visual == FB_VISUAL_MONO01 ||
259 info->fix.visual == FB_VISUAL_MONO10)
260 fg = ~((u8) (0xfff << info->var.green.length));
261
262 switch (depth) {
263 case 4:
264 for (i = 0; i < logo->height; i++)
265 for (j = 0; j < logo->width; src++) {
266 *dst++ = *src >> 4;
267 j++;
268 if (j < logo->width) {
269 *dst++ = *src & 0x0f;
270 j++;
271 }
272 }
273 break;
274 case 1:
275 for (i = 0; i < logo->height; i++) {
276 for (j = 0; j < logo->width; src++) {
277 d = *src ^ xor;
278 for (k = 7; k >= 0; k--) {
279 *dst++ = ((d >> k) & 1) ? fg : 0;
280 j++;
281 }
282 }
283 }
284 break;
285 }
286 }
287
288 /*
289 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
290 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
291 * the visual format and color depth of the framebuffer, the DAC, the
292 * pseudo_palette, and the logo data will be adjusted accordingly.
293 *
294 * Case 1 - linux_logo_clut224:
295 * Color exceeds the number of console colors (16), thus we set the hardware DAC
296 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
297 *
298 * For visuals that require color info from the pseudo_palette, we also construct
299 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
300 * will be set.
301 *
302 * Case 2 - linux_logo_vga16:
303 * The number of colors just matches the console colors, thus there is no need
304 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
305 * each byte contains color information for two pixels (upper and lower nibble).
306 * To be consistent with fb_imageblit() usage, we therefore separate the two
307 * nibbles into separate bytes. The "depth" flag will be set to 4.
308 *
309 * Case 3 - linux_logo_mono:
310 * This is similar with Case 2. Each byte contains information for 8 pixels.
311 * We isolate each bit and expand each into a byte. The "depth" flag will
312 * be set to 1.
313 */
314 static struct logo_data {
315 int depth;
316 int needs_directpalette;
317 int needs_truepalette;
318 int needs_cmapreset;
319 const struct linux_logo *logo;
320 } fb_logo __read_mostly;
321
322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
323 {
324 u32 size = width * height, i;
325
326 out += size - 1;
327
328 for (i = size; i--; )
329 *out-- = *in++;
330 }
331
332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
333 {
334 int i, j, h = height - 1;
335
336 for (i = 0; i < height; i++)
337 for (j = 0; j < width; j++)
338 out[height * j + h - i] = *in++;
339 }
340
341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
342 {
343 int i, j, w = width - 1;
344
345 for (i = 0; i < height; i++)
346 for (j = 0; j < width; j++)
347 out[height * (w - j) + i] = *in++;
348 }
349
350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
351 struct fb_image *image, int rotate)
352 {
353 u32 tmp;
354
355 if (rotate == FB_ROTATE_UD) {
356 fb_rotate_logo_ud(image->data, dst, image->width,
357 image->height);
358 image->dx = info->var.xres - image->width - image->dx;
359 image->dy = info->var.yres - image->height - image->dy;
360 } else if (rotate == FB_ROTATE_CW) {
361 fb_rotate_logo_cw(image->data, dst, image->width,
362 image->height);
363 tmp = image->width;
364 image->width = image->height;
365 image->height = tmp;
366 tmp = image->dy;
367 image->dy = image->dx;
368 image->dx = info->var.xres - image->width - tmp;
369 } else if (rotate == FB_ROTATE_CCW) {
370 fb_rotate_logo_ccw(image->data, dst, image->width,
371 image->height);
372 tmp = image->width;
373 image->width = image->height;
374 image->height = tmp;
375 tmp = image->dx;
376 image->dx = image->dy;
377 image->dy = info->var.yres - image->height - tmp;
378 }
379
380 image->data = dst;
381 }
382
383 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
384 int rotate, unsigned int num)
385 {
386 unsigned int x;
387
388 if (rotate == FB_ROTATE_UR) {
389 for (x = 0;
390 x < num && image->dx + image->width <= info->var.xres;
391 x++) {
392 info->fbops->fb_imageblit(info, image);
393 image->dx += image->width + 8;
394 }
395 } else if (rotate == FB_ROTATE_UD) {
396 for (x = 0; x < num && image->dx >= 0; x++) {
397 info->fbops->fb_imageblit(info, image);
398 image->dx -= image->width + 8;
399 }
400 } else if (rotate == FB_ROTATE_CW) {
401 for (x = 0;
402 x < num && image->dy + image->height <= info->var.yres;
403 x++) {
404 info->fbops->fb_imageblit(info, image);
405 image->dy += image->height + 8;
406 }
407 } else if (rotate == FB_ROTATE_CCW) {
408 for (x = 0; x < num && image->dy >= 0; x++) {
409 info->fbops->fb_imageblit(info, image);
410 image->dy -= image->height + 8;
411 }
412 }
413 }
414
415 static int fb_show_logo_line(struct fb_info *info, int rotate,
416 const struct linux_logo *logo, int y,
417 unsigned int n)
418 {
419 u32 *palette = NULL, *saved_pseudo_palette = NULL;
420 unsigned char *logo_new = NULL, *logo_rotate = NULL;
421 struct fb_image image;
422
423 /* Return if the frame buffer is not mapped or suspended */
424 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
425 info->flags & FBINFO_MODULE)
426 return 0;
427
428 image.depth = 8;
429 image.data = logo->data;
430
431 if (fb_logo.needs_cmapreset)
432 fb_set_logocmap(info, logo);
433
434 if (fb_logo.needs_truepalette ||
435 fb_logo.needs_directpalette) {
436 palette = kmalloc(256 * 4, GFP_KERNEL);
437 if (palette == NULL)
438 return 0;
439
440 if (fb_logo.needs_truepalette)
441 fb_set_logo_truepalette(info, logo, palette);
442 else
443 fb_set_logo_directpalette(info, logo, palette);
444
445 saved_pseudo_palette = info->pseudo_palette;
446 info->pseudo_palette = palette;
447 }
448
449 if (fb_logo.depth <= 4) {
450 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
451 if (logo_new == NULL) {
452 kfree(palette);
453 if (saved_pseudo_palette)
454 info->pseudo_palette = saved_pseudo_palette;
455 return 0;
456 }
457 image.data = logo_new;
458 fb_set_logo(info, logo, logo_new, fb_logo.depth);
459 }
460
461 image.dx = 0;
462 image.dy = y;
463 image.width = logo->width;
464 image.height = logo->height;
465
466 if (rotate) {
467 logo_rotate = kmalloc(logo->width *
468 logo->height, GFP_KERNEL);
469 if (logo_rotate)
470 fb_rotate_logo(info, logo_rotate, &image, rotate);
471 }
472
473 fb_do_show_logo(info, &image, rotate, n);
474
475 kfree(palette);
476 if (saved_pseudo_palette != NULL)
477 info->pseudo_palette = saved_pseudo_palette;
478 kfree(logo_new);
479 kfree(logo_rotate);
480 return logo->height;
481 }
482
483
484 #ifdef CONFIG_FB_LOGO_EXTRA
485
486 #define FB_LOGO_EX_NUM_MAX 10
487 static struct logo_data_extra {
488 const struct linux_logo *logo;
489 unsigned int n;
490 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
491 static unsigned int fb_logo_ex_num;
492
493 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
494 {
495 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
496 return;
497
498 fb_logo_ex[fb_logo_ex_num].logo = logo;
499 fb_logo_ex[fb_logo_ex_num].n = n;
500 fb_logo_ex_num++;
501 }
502
503 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
504 unsigned int yres)
505 {
506 unsigned int i;
507
508 /* FIXME: logo_ex supports only truecolor fb. */
509 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
510 fb_logo_ex_num = 0;
511
512 for (i = 0; i < fb_logo_ex_num; i++) {
513 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
514 fb_logo_ex[i].logo = NULL;
515 continue;
516 }
517 height += fb_logo_ex[i].logo->height;
518 if (height > yres) {
519 height -= fb_logo_ex[i].logo->height;
520 fb_logo_ex_num = i;
521 break;
522 }
523 }
524 return height;
525 }
526
527 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
528 {
529 unsigned int i;
530
531 for (i = 0; i < fb_logo_ex_num; i++)
532 y += fb_show_logo_line(info, rotate,
533 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
534
535 return y;
536 }
537
538 #else /* !CONFIG_FB_LOGO_EXTRA */
539
540 static inline int fb_prepare_extra_logos(struct fb_info *info,
541 unsigned int height,
542 unsigned int yres)
543 {
544 return height;
545 }
546
547 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
548 {
549 return y;
550 }
551
552 #endif /* CONFIG_FB_LOGO_EXTRA */
553
554
555 int fb_prepare_logo(struct fb_info *info, int rotate)
556 {
557 int depth = fb_get_color_depth(&info->var, &info->fix);
558 unsigned int yres;
559
560 memset(&fb_logo, 0, sizeof(struct logo_data));
561
562 if (info->flags & FBINFO_MISC_TILEBLITTING ||
563 info->flags & FBINFO_MODULE)
564 return 0;
565
566 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
567 depth = info->var.blue.length;
568 if (info->var.red.length < depth)
569 depth = info->var.red.length;
570 if (info->var.green.length < depth)
571 depth = info->var.green.length;
572 }
573
574 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
575 /* assume console colormap */
576 depth = 4;
577 }
578
579 /* Return if no suitable logo was found */
580 fb_logo.logo = fb_find_logo(depth);
581
582 if (!fb_logo.logo) {
583 return 0;
584 }
585
586 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
587 yres = info->var.yres;
588 else
589 yres = info->var.xres;
590
591 if (fb_logo.logo->height > yres) {
592 fb_logo.logo = NULL;
593 return 0;
594 }
595
596 /* What depth we asked for might be different from what we get */
597 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
598 fb_logo.depth = 8;
599 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
600 fb_logo.depth = 4;
601 else
602 fb_logo.depth = 1;
603
604
605 if (fb_logo.depth > 4 && depth > 4) {
606 switch (info->fix.visual) {
607 case FB_VISUAL_TRUECOLOR:
608 fb_logo.needs_truepalette = 1;
609 break;
610 case FB_VISUAL_DIRECTCOLOR:
611 fb_logo.needs_directpalette = 1;
612 fb_logo.needs_cmapreset = 1;
613 break;
614 case FB_VISUAL_PSEUDOCOLOR:
615 fb_logo.needs_cmapreset = 1;
616 break;
617 }
618 }
619
620 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
621 }
622
623 int fb_show_logo(struct fb_info *info, int rotate)
624 {
625 int y;
626
627 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
628 num_online_cpus());
629 y = fb_show_extra_logos(info, y, rotate);
630
631 return y;
632 }
633 #else
634 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
635 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
636 #endif /* CONFIG_LOGO */
637
638 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
639 {
640 return (*pos < FB_MAX) ? pos : NULL;
641 }
642
643 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
644 {
645 (*pos)++;
646 return (*pos < FB_MAX) ? pos : NULL;
647 }
648
649 static void fb_seq_stop(struct seq_file *m, void *v)
650 {
651 }
652
653 static int fb_seq_show(struct seq_file *m, void *v)
654 {
655 int i = *(loff_t *)v;
656 struct fb_info *fi = registered_fb[i];
657
658 if (fi)
659 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
660 return 0;
661 }
662
663 static const struct seq_operations proc_fb_seq_ops = {
664 .start = fb_seq_start,
665 .next = fb_seq_next,
666 .stop = fb_seq_stop,
667 .show = fb_seq_show,
668 };
669
670 static int proc_fb_open(struct inode *inode, struct file *file)
671 {
672 return seq_open(file, &proc_fb_seq_ops);
673 }
674
675 static const struct file_operations fb_proc_fops = {
676 .owner = THIS_MODULE,
677 .open = proc_fb_open,
678 .read = seq_read,
679 .llseek = seq_lseek,
680 .release = seq_release,
681 };
682
683 static ssize_t
684 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
685 {
686 unsigned long p = *ppos;
687 struct inode *inode = file->f_path.dentry->d_inode;
688 int fbidx = iminor(inode);
689 struct fb_info *info = registered_fb[fbidx];
690 u32 *buffer, *dst;
691 u32 __iomem *src;
692 int c, i, cnt = 0, err = 0;
693 unsigned long total_size;
694
695 if (!info || ! info->screen_base)
696 return -ENODEV;
697
698 if (info->state != FBINFO_STATE_RUNNING)
699 return -EPERM;
700
701 if (info->fbops->fb_read)
702 return info->fbops->fb_read(info, buf, count, ppos);
703
704 total_size = info->screen_size;
705
706 if (total_size == 0)
707 total_size = info->fix.smem_len;
708
709 if (p >= total_size)
710 return 0;
711
712 if (count >= total_size)
713 count = total_size;
714
715 if (count + p > total_size)
716 count = total_size - p;
717
718 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
719 GFP_KERNEL);
720 if (!buffer)
721 return -ENOMEM;
722
723 src = (u32 __iomem *) (info->screen_base + p);
724
725 if (info->fbops->fb_sync)
726 info->fbops->fb_sync(info);
727
728 while (count) {
729 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
730 dst = buffer;
731 for (i = c >> 2; i--; )
732 *dst++ = fb_readl(src++);
733 if (c & 3) {
734 u8 *dst8 = (u8 *) dst;
735 u8 __iomem *src8 = (u8 __iomem *) src;
736
737 for (i = c & 3; i--;)
738 *dst8++ = fb_readb(src8++);
739
740 src = (u32 __iomem *) src8;
741 }
742
743 if (copy_to_user(buf, buffer, c)) {
744 err = -EFAULT;
745 break;
746 }
747 *ppos += c;
748 buf += c;
749 cnt += c;
750 count -= c;
751 }
752
753 kfree(buffer);
754
755 return (err) ? err : cnt;
756 }
757
758 static ssize_t
759 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
760 {
761 unsigned long p = *ppos;
762 struct inode *inode = file->f_path.dentry->d_inode;
763 int fbidx = iminor(inode);
764 struct fb_info *info = registered_fb[fbidx];
765 u32 *buffer, *src;
766 u32 __iomem *dst;
767 int c, i, cnt = 0, err = 0;
768 unsigned long total_size;
769
770 if (!info || !info->screen_base)
771 return -ENODEV;
772
773 if (info->state != FBINFO_STATE_RUNNING)
774 return -EPERM;
775
776 if (info->fbops->fb_write)
777 return info->fbops->fb_write(info, buf, count, ppos);
778
779 total_size = info->screen_size;
780
781 if (total_size == 0)
782 total_size = info->fix.smem_len;
783
784 if (p > total_size)
785 return -EFBIG;
786
787 if (count > total_size) {
788 err = -EFBIG;
789 count = total_size;
790 }
791
792 if (count + p > total_size) {
793 if (!err)
794 err = -ENOSPC;
795
796 count = total_size - p;
797 }
798
799 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
800 GFP_KERNEL);
801 if (!buffer)
802 return -ENOMEM;
803
804 dst = (u32 __iomem *) (info->screen_base + p);
805
806 if (info->fbops->fb_sync)
807 info->fbops->fb_sync(info);
808
809 while (count) {
810 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
811 src = buffer;
812
813 if (copy_from_user(src, buf, c)) {
814 err = -EFAULT;
815 break;
816 }
817
818 for (i = c >> 2; i--; )
819 fb_writel(*src++, dst++);
820
821 if (c & 3) {
822 u8 *src8 = (u8 *) src;
823 u8 __iomem *dst8 = (u8 __iomem *) dst;
824
825 for (i = c & 3; i--; )
826 fb_writeb(*src8++, dst8++);
827
828 dst = (u32 __iomem *) dst8;
829 }
830
831 *ppos += c;
832 buf += c;
833 cnt += c;
834 count -= c;
835 }
836
837 kfree(buffer);
838
839 return (cnt) ? cnt : err;
840 }
841
842 int
843 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
844 {
845 struct fb_fix_screeninfo *fix = &info->fix;
846 unsigned int yres = info->var.yres;
847 int err = 0;
848
849 if (var->yoffset > 0) {
850 if (var->vmode & FB_VMODE_YWRAP) {
851 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
852 err = -EINVAL;
853 else
854 yres = 0;
855 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
856 err = -EINVAL;
857 }
858
859 if (var->xoffset > 0 && (!fix->xpanstep ||
860 (var->xoffset % fix->xpanstep)))
861 err = -EINVAL;
862
863 if (err || !info->fbops->fb_pan_display ||
864 var->yoffset + yres > info->var.yres_virtual ||
865 var->xoffset + info->var.xres > info->var.xres_virtual)
866 return -EINVAL;
867
868 if ((err = info->fbops->fb_pan_display(var, info)))
869 return err;
870 info->var.xoffset = var->xoffset;
871 info->var.yoffset = var->yoffset;
872 if (var->vmode & FB_VMODE_YWRAP)
873 info->var.vmode |= FB_VMODE_YWRAP;
874 else
875 info->var.vmode &= ~FB_VMODE_YWRAP;
876 return 0;
877 }
878
879 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
880 u32 activate)
881 {
882 struct fb_event event;
883 struct fb_blit_caps caps, fbcaps;
884 int err = 0;
885
886 memset(&caps, 0, sizeof(caps));
887 memset(&fbcaps, 0, sizeof(fbcaps));
888 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
889 event.info = info;
890 event.data = &caps;
891 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
892 info->fbops->fb_get_caps(info, &fbcaps, var);
893
894 if (((fbcaps.x ^ caps.x) & caps.x) ||
895 ((fbcaps.y ^ caps.y) & caps.y) ||
896 (fbcaps.len < caps.len))
897 err = -EINVAL;
898
899 return err;
900 }
901
902 int
903 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
904 {
905 int flags = info->flags;
906 int ret = 0;
907
908 if (var->activate & FB_ACTIVATE_INV_MODE) {
909 struct fb_videomode mode1, mode2;
910
911 fb_var_to_videomode(&mode1, var);
912 fb_var_to_videomode(&mode2, &info->var);
913 /* make sure we don't delete the videomode of current var */
914 ret = fb_mode_is_equal(&mode1, &mode2);
915
916 if (!ret) {
917 struct fb_event event;
918
919 event.info = info;
920 event.data = &mode1;
921 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
922 }
923
924 if (!ret)
925 fb_delete_videomode(&mode1, &info->modelist);
926
927
928 ret = (ret) ? -EINVAL : 0;
929 goto done;
930 }
931
932 if ((var->activate & FB_ACTIVATE_FORCE) ||
933 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
934 u32 activate = var->activate;
935
936 if (!info->fbops->fb_check_var) {
937 *var = info->var;
938 goto done;
939 }
940
941 ret = info->fbops->fb_check_var(var, info);
942
943 if (ret)
944 goto done;
945
946 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
947 struct fb_videomode mode;
948
949 if (info->fbops->fb_get_caps) {
950 ret = fb_check_caps(info, var, activate);
951
952 if (ret)
953 goto done;
954 }
955
956 info->var = *var;
957
958 if (info->fbops->fb_set_par)
959 info->fbops->fb_set_par(info);
960
961 fb_pan_display(info, &info->var);
962 fb_set_cmap(&info->cmap, info);
963 fb_var_to_videomode(&mode, &info->var);
964
965 if (info->modelist.prev && info->modelist.next &&
966 !list_empty(&info->modelist))
967 ret = fb_add_videomode(&mode, &info->modelist);
968
969 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
970 struct fb_event event;
971 int evnt = (activate & FB_ACTIVATE_ALL) ?
972 FB_EVENT_MODE_CHANGE_ALL :
973 FB_EVENT_MODE_CHANGE;
974
975 info->flags &= ~FBINFO_MISC_USEREVENT;
976 event.info = info;
977 event.data = &mode;
978 fb_notifier_call_chain(evnt, &event);
979 }
980 }
981 }
982
983 done:
984 return ret;
985 }
986
987 int
988 fb_blank(struct fb_info *info, int blank)
989 {
990 int ret = -EINVAL;
991
992 if (blank > FB_BLANK_POWERDOWN)
993 blank = FB_BLANK_POWERDOWN;
994
995 if (info->fbops->fb_blank)
996 ret = info->fbops->fb_blank(blank, info);
997
998 if (!ret) {
999 struct fb_event event;
1000
1001 event.info = info;
1002 event.data = &blank;
1003 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1004 }
1005
1006 return ret;
1007 }
1008
1009 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1010 unsigned long arg)
1011 {
1012 struct fb_ops *fb;
1013 struct fb_var_screeninfo var;
1014 struct fb_fix_screeninfo fix;
1015 struct fb_con2fbmap con2fb;
1016 struct fb_cmap_user cmap;
1017 struct fb_event event;
1018 void __user *argp = (void __user *)arg;
1019 long ret = 0;
1020
1021 fb = info->fbops;
1022 if (!fb)
1023 return -ENODEV;
1024
1025 switch (cmd) {
1026 case FBIOGET_VSCREENINFO:
1027 ret = copy_to_user(argp, &info->var,
1028 sizeof(var)) ? -EFAULT : 0;
1029 break;
1030 case FBIOPUT_VSCREENINFO:
1031 if (copy_from_user(&var, argp, sizeof(var))) {
1032 ret = -EFAULT;
1033 break;
1034 }
1035 acquire_console_sem();
1036 info->flags |= FBINFO_MISC_USEREVENT;
1037 ret = fb_set_var(info, &var);
1038 info->flags &= ~FBINFO_MISC_USEREVENT;
1039 release_console_sem();
1040 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1041 ret = -EFAULT;
1042 break;
1043 case FBIOGET_FSCREENINFO:
1044 ret = copy_to_user(argp, &info->fix,
1045 sizeof(fix)) ? -EFAULT : 0;
1046 break;
1047 case FBIOPUTCMAP:
1048 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1049 ret = -EFAULT;
1050 else
1051 ret = fb_set_user_cmap(&cmap, info);
1052 break;
1053 case FBIOGETCMAP:
1054 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1055 ret = -EFAULT;
1056 else
1057 ret = fb_cmap_to_user(&info->cmap, &cmap);
1058 break;
1059 case FBIOPAN_DISPLAY:
1060 if (copy_from_user(&var, argp, sizeof(var))) {
1061 ret = -EFAULT;
1062 break;
1063 }
1064 acquire_console_sem();
1065 ret = fb_pan_display(info, &var);
1066 release_console_sem();
1067 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1068 ret = -EFAULT;
1069 break;
1070 case FBIO_CURSOR:
1071 ret = -EINVAL;
1072 break;
1073 case FBIOGET_CON2FBMAP:
1074 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1075 ret = -EFAULT;
1076 else if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1077 ret = -EINVAL;
1078 else {
1079 con2fb.framebuffer = -1;
1080 event.info = info;
1081 event.data = &con2fb;
1082 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP,
1083 &event);
1084 ret = copy_to_user(argp, &con2fb,
1085 sizeof(con2fb)) ? -EFAULT : 0;
1086 }
1087 break;
1088 case FBIOPUT_CON2FBMAP:
1089 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) {
1090 ret = -EFAULT;
1091 break;
1092 }
1093 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) {
1094 ret = -EINVAL;
1095 break;
1096 }
1097 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX) {
1098 ret = -EINVAL;
1099 break;
1100 }
1101 if (!registered_fb[con2fb.framebuffer])
1102 request_module("fb%d", con2fb.framebuffer);
1103 if (!registered_fb[con2fb.framebuffer]) {
1104 ret = -EINVAL;
1105 break;
1106 }
1107 event.info = info;
1108 event.data = &con2fb;
1109 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1110 &event);
1111 break;
1112 case FBIOBLANK:
1113 acquire_console_sem();
1114 info->flags |= FBINFO_MISC_USEREVENT;
1115 ret = fb_blank(info, arg);
1116 info->flags &= ~FBINFO_MISC_USEREVENT;
1117 release_console_sem();
1118 break;;
1119 default:
1120 if (fb->fb_ioctl == NULL)
1121 ret = -ENOTTY;
1122 else
1123 ret = fb->fb_ioctl(info, cmd, arg);
1124 }
1125 return ret;
1126 }
1127
1128 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1129 __acquires(&info->lock)
1130 __releases(&info->lock)
1131 {
1132 struct inode *inode = file->f_path.dentry->d_inode;
1133 int fbidx = iminor(inode);
1134 struct fb_info *info;
1135 long ret;
1136
1137 info = registered_fb[fbidx];
1138 mutex_lock(&info->lock);
1139 ret = do_fb_ioctl(info, cmd, arg);
1140 mutex_unlock(&info->lock);
1141 return ret;
1142 }
1143
1144 #ifdef CONFIG_COMPAT
1145 struct fb_fix_screeninfo32 {
1146 char id[16];
1147 compat_caddr_t smem_start;
1148 u32 smem_len;
1149 u32 type;
1150 u32 type_aux;
1151 u32 visual;
1152 u16 xpanstep;
1153 u16 ypanstep;
1154 u16 ywrapstep;
1155 u32 line_length;
1156 compat_caddr_t mmio_start;
1157 u32 mmio_len;
1158 u32 accel;
1159 u16 reserved[3];
1160 };
1161
1162 struct fb_cmap32 {
1163 u32 start;
1164 u32 len;
1165 compat_caddr_t red;
1166 compat_caddr_t green;
1167 compat_caddr_t blue;
1168 compat_caddr_t transp;
1169 };
1170
1171 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1172 unsigned long arg)
1173 {
1174 struct fb_cmap_user __user *cmap;
1175 struct fb_cmap32 __user *cmap32;
1176 __u32 data;
1177 int err;
1178
1179 cmap = compat_alloc_user_space(sizeof(*cmap));
1180 cmap32 = compat_ptr(arg);
1181
1182 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1183 return -EFAULT;
1184
1185 if (get_user(data, &cmap32->red) ||
1186 put_user(compat_ptr(data), &cmap->red) ||
1187 get_user(data, &cmap32->green) ||
1188 put_user(compat_ptr(data), &cmap->green) ||
1189 get_user(data, &cmap32->blue) ||
1190 put_user(compat_ptr(data), &cmap->blue) ||
1191 get_user(data, &cmap32->transp) ||
1192 put_user(compat_ptr(data), &cmap->transp))
1193 return -EFAULT;
1194
1195 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1196
1197 if (!err) {
1198 if (copy_in_user(&cmap32->start,
1199 &cmap->start,
1200 2 * sizeof(__u32)))
1201 err = -EFAULT;
1202 }
1203 return err;
1204 }
1205
1206 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1207 struct fb_fix_screeninfo32 __user *fix32)
1208 {
1209 __u32 data;
1210 int err;
1211
1212 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1213
1214 data = (__u32) (unsigned long) fix->smem_start;
1215 err |= put_user(data, &fix32->smem_start);
1216
1217 err |= put_user(fix->smem_len, &fix32->smem_len);
1218 err |= put_user(fix->type, &fix32->type);
1219 err |= put_user(fix->type_aux, &fix32->type_aux);
1220 err |= put_user(fix->visual, &fix32->visual);
1221 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1222 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1223 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1224 err |= put_user(fix->line_length, &fix32->line_length);
1225
1226 data = (__u32) (unsigned long) fix->mmio_start;
1227 err |= put_user(data, &fix32->mmio_start);
1228
1229 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1230 err |= put_user(fix->accel, &fix32->accel);
1231 err |= copy_to_user(fix32->reserved, fix->reserved,
1232 sizeof(fix->reserved));
1233
1234 return err;
1235 }
1236
1237 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1238 unsigned long arg)
1239 {
1240 mm_segment_t old_fs;
1241 struct fb_fix_screeninfo fix;
1242 struct fb_fix_screeninfo32 __user *fix32;
1243 int err;
1244
1245 fix32 = compat_ptr(arg);
1246
1247 old_fs = get_fs();
1248 set_fs(KERNEL_DS);
1249 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1250 set_fs(old_fs);
1251
1252 if (!err)
1253 err = do_fscreeninfo_to_user(&fix, fix32);
1254
1255 return err;
1256 }
1257
1258 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1259 unsigned long arg)
1260 __acquires(&info->lock)
1261 __releases(&info->lock)
1262 {
1263 struct inode *inode = file->f_path.dentry->d_inode;
1264 int fbidx = iminor(inode);
1265 struct fb_info *info = registered_fb[fbidx];
1266 struct fb_ops *fb = info->fbops;
1267 long ret = -ENOIOCTLCMD;
1268
1269 mutex_lock(&info->lock);
1270 switch(cmd) {
1271 case FBIOGET_VSCREENINFO:
1272 case FBIOPUT_VSCREENINFO:
1273 case FBIOPAN_DISPLAY:
1274 case FBIOGET_CON2FBMAP:
1275 case FBIOPUT_CON2FBMAP:
1276 arg = (unsigned long) compat_ptr(arg);
1277 case FBIOBLANK:
1278 ret = do_fb_ioctl(info, cmd, arg);
1279 break;
1280
1281 case FBIOGET_FSCREENINFO:
1282 ret = fb_get_fscreeninfo(info, cmd, arg);
1283 break;
1284
1285 case FBIOGETCMAP:
1286 case FBIOPUTCMAP:
1287 ret = fb_getput_cmap(info, cmd, arg);
1288 break;
1289
1290 default:
1291 if (fb->fb_compat_ioctl)
1292 ret = fb->fb_compat_ioctl(info, cmd, arg);
1293 break;
1294 }
1295 mutex_unlock(&info->lock);
1296 return ret;
1297 }
1298 #endif
1299
1300 static int
1301 fb_mmap(struct file *file, struct vm_area_struct * vma)
1302 __acquires(&info->lock)
1303 __releases(&info->lock)
1304 {
1305 int fbidx = iminor(file->f_path.dentry->d_inode);
1306 struct fb_info *info = registered_fb[fbidx];
1307 struct fb_ops *fb = info->fbops;
1308 unsigned long off;
1309 unsigned long start;
1310 u32 len;
1311
1312 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1313 return -EINVAL;
1314 off = vma->vm_pgoff << PAGE_SHIFT;
1315 if (!fb)
1316 return -ENODEV;
1317 if (fb->fb_mmap) {
1318 int res;
1319 mutex_lock(&info->lock);
1320 res = fb->fb_mmap(info, vma);
1321 mutex_unlock(&info->lock);
1322 return res;
1323 }
1324
1325 mutex_lock(&info->lock);
1326
1327 /* frame buffer memory */
1328 start = info->fix.smem_start;
1329 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1330 if (off >= len) {
1331 /* memory mapped io */
1332 off -= len;
1333 if (info->var.accel_flags) {
1334 mutex_unlock(&info->lock);
1335 return -EINVAL;
1336 }
1337 start = info->fix.mmio_start;
1338 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1339 }
1340 mutex_unlock(&info->lock);
1341 start &= PAGE_MASK;
1342 if ((vma->vm_end - vma->vm_start + off) > len)
1343 return -EINVAL;
1344 off += start;
1345 vma->vm_pgoff = off >> PAGE_SHIFT;
1346 /* This is an IO map - tell maydump to skip this VMA */
1347 vma->vm_flags |= VM_IO | VM_RESERVED;
1348 fb_pgprotect(file, vma, off);
1349 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1350 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1351 return -EAGAIN;
1352 return 0;
1353 }
1354
1355 static int
1356 fb_open(struct inode *inode, struct file *file)
1357 __acquires(&info->lock)
1358 __releases(&info->lock)
1359 {
1360 int fbidx = iminor(inode);
1361 struct fb_info *info;
1362 int res = 0;
1363
1364 if (fbidx >= FB_MAX)
1365 return -ENODEV;
1366 info = registered_fb[fbidx];
1367 if (!info)
1368 request_module("fb%d", fbidx);
1369 info = registered_fb[fbidx];
1370 if (!info)
1371 return -ENODEV;
1372 mutex_lock(&info->lock);
1373 if (!try_module_get(info->fbops->owner)) {
1374 res = -ENODEV;
1375 goto out;
1376 }
1377 file->private_data = info;
1378 if (info->fbops->fb_open) {
1379 res = info->fbops->fb_open(info,1);
1380 if (res)
1381 module_put(info->fbops->owner);
1382 }
1383 #ifdef CONFIG_FB_DEFERRED_IO
1384 if (info->fbdefio)
1385 fb_deferred_io_open(info, inode, file);
1386 #endif
1387 out:
1388 mutex_unlock(&info->lock);
1389 return res;
1390 }
1391
1392 static int
1393 fb_release(struct inode *inode, struct file *file)
1394 __acquires(&info->lock)
1395 __releases(&info->lock)
1396 {
1397 struct fb_info * const info = file->private_data;
1398
1399 mutex_lock(&info->lock);
1400 if (info->fbops->fb_release)
1401 info->fbops->fb_release(info,1);
1402 module_put(info->fbops->owner);
1403 mutex_unlock(&info->lock);
1404 return 0;
1405 }
1406
1407 static const struct file_operations fb_fops = {
1408 .owner = THIS_MODULE,
1409 .read = fb_read,
1410 .write = fb_write,
1411 .unlocked_ioctl = fb_ioctl,
1412 #ifdef CONFIG_COMPAT
1413 .compat_ioctl = fb_compat_ioctl,
1414 #endif
1415 .mmap = fb_mmap,
1416 .open = fb_open,
1417 .release = fb_release,
1418 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1419 .get_unmapped_area = get_fb_unmapped_area,
1420 #endif
1421 #ifdef CONFIG_FB_DEFERRED_IO
1422 .fsync = fb_deferred_io_fsync,
1423 #endif
1424 };
1425
1426 struct class *fb_class;
1427 EXPORT_SYMBOL(fb_class);
1428
1429 static int fb_check_foreignness(struct fb_info *fi)
1430 {
1431 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1432
1433 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1434
1435 #ifdef __BIG_ENDIAN
1436 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1437 #else
1438 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1439 #endif /* __BIG_ENDIAN */
1440
1441 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1442 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1443 "support this framebuffer\n", fi->fix.id);
1444 return -ENOSYS;
1445 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1446 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1447 "support this framebuffer\n", fi->fix.id);
1448 return -ENOSYS;
1449 }
1450
1451 return 0;
1452 }
1453
1454 /**
1455 * register_framebuffer - registers a frame buffer device
1456 * @fb_info: frame buffer info structure
1457 *
1458 * Registers a frame buffer device @fb_info.
1459 *
1460 * Returns negative errno on error, or zero for success.
1461 *
1462 */
1463
1464 int
1465 register_framebuffer(struct fb_info *fb_info)
1466 {
1467 int i;
1468 struct fb_event event;
1469 struct fb_videomode mode;
1470
1471 if (num_registered_fb == FB_MAX)
1472 return -ENXIO;
1473
1474 if (fb_check_foreignness(fb_info))
1475 return -ENOSYS;
1476
1477 num_registered_fb++;
1478 for (i = 0 ; i < FB_MAX; i++)
1479 if (!registered_fb[i])
1480 break;
1481 fb_info->node = i;
1482 mutex_init(&fb_info->lock);
1483
1484 fb_info->dev = device_create(fb_class, fb_info->device,
1485 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1486 if (IS_ERR(fb_info->dev)) {
1487 /* Not fatal */
1488 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1489 fb_info->dev = NULL;
1490 } else
1491 fb_init_device(fb_info);
1492
1493 if (fb_info->pixmap.addr == NULL) {
1494 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1495 if (fb_info->pixmap.addr) {
1496 fb_info->pixmap.size = FBPIXMAPSIZE;
1497 fb_info->pixmap.buf_align = 1;
1498 fb_info->pixmap.scan_align = 1;
1499 fb_info->pixmap.access_align = 32;
1500 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1501 }
1502 }
1503 fb_info->pixmap.offset = 0;
1504
1505 if (!fb_info->pixmap.blit_x)
1506 fb_info->pixmap.blit_x = ~(u32)0;
1507
1508 if (!fb_info->pixmap.blit_y)
1509 fb_info->pixmap.blit_y = ~(u32)0;
1510
1511 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1512 INIT_LIST_HEAD(&fb_info->modelist);
1513
1514 fb_var_to_videomode(&mode, &fb_info->var);
1515 fb_add_videomode(&mode, &fb_info->modelist);
1516 registered_fb[i] = fb_info;
1517
1518 event.info = fb_info;
1519 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1520 return 0;
1521 }
1522
1523
1524 /**
1525 * unregister_framebuffer - releases a frame buffer device
1526 * @fb_info: frame buffer info structure
1527 *
1528 * Unregisters a frame buffer device @fb_info.
1529 *
1530 * Returns negative errno on error, or zero for success.
1531 *
1532 * This function will also notify the framebuffer console
1533 * to release the driver.
1534 *
1535 * This is meant to be called within a driver's module_exit()
1536 * function. If this is called outside module_exit(), ensure
1537 * that the driver implements fb_open() and fb_release() to
1538 * check that no processes are using the device.
1539 */
1540
1541 int
1542 unregister_framebuffer(struct fb_info *fb_info)
1543 {
1544 struct fb_event event;
1545 int i, ret = 0;
1546
1547 i = fb_info->node;
1548 if (!registered_fb[i]) {
1549 ret = -EINVAL;
1550 goto done;
1551 }
1552
1553 event.info = fb_info;
1554 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1555
1556 if (ret) {
1557 ret = -EINVAL;
1558 goto done;
1559 }
1560
1561 if (fb_info->pixmap.addr &&
1562 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1563 kfree(fb_info->pixmap.addr);
1564 fb_destroy_modelist(&fb_info->modelist);
1565 registered_fb[i]=NULL;
1566 num_registered_fb--;
1567 fb_cleanup_device(fb_info);
1568 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1569 event.info = fb_info;
1570 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1571 done:
1572 return ret;
1573 }
1574
1575 /**
1576 * fb_set_suspend - low level driver signals suspend
1577 * @info: framebuffer affected
1578 * @state: 0 = resuming, !=0 = suspending
1579 *
1580 * This is meant to be used by low level drivers to
1581 * signal suspend/resume to the core & clients.
1582 * It must be called with the console semaphore held
1583 */
1584 void fb_set_suspend(struct fb_info *info, int state)
1585 {
1586 struct fb_event event;
1587
1588 event.info = info;
1589 if (state) {
1590 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1591 info->state = FBINFO_STATE_SUSPENDED;
1592 } else {
1593 info->state = FBINFO_STATE_RUNNING;
1594 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1595 }
1596 }
1597
1598 /**
1599 * fbmem_init - init frame buffer subsystem
1600 *
1601 * Initialize the frame buffer subsystem.
1602 *
1603 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1604 *
1605 */
1606
1607 static int __init
1608 fbmem_init(void)
1609 {
1610 proc_create("fb", 0, NULL, &fb_proc_fops);
1611
1612 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1613 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1614
1615 fb_class = class_create(THIS_MODULE, "graphics");
1616 if (IS_ERR(fb_class)) {
1617 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1618 fb_class = NULL;
1619 }
1620 return 0;
1621 }
1622
1623 #ifdef MODULE
1624 module_init(fbmem_init);
1625 static void __exit
1626 fbmem_exit(void)
1627 {
1628 remove_proc_entry("fb", NULL);
1629 class_destroy(fb_class);
1630 unregister_chrdev(FB_MAJOR, "fb");
1631 }
1632
1633 module_exit(fbmem_exit);
1634 MODULE_LICENSE("GPL");
1635 MODULE_DESCRIPTION("Framebuffer base");
1636 #else
1637 subsys_initcall(fbmem_init);
1638 #endif
1639
1640 int fb_new_modelist(struct fb_info *info)
1641 {
1642 struct fb_event event;
1643 struct fb_var_screeninfo var = info->var;
1644 struct list_head *pos, *n;
1645 struct fb_modelist *modelist;
1646 struct fb_videomode *m, mode;
1647 int err = 1;
1648
1649 list_for_each_safe(pos, n, &info->modelist) {
1650 modelist = list_entry(pos, struct fb_modelist, list);
1651 m = &modelist->mode;
1652 fb_videomode_to_var(&var, m);
1653 var.activate = FB_ACTIVATE_TEST;
1654 err = fb_set_var(info, &var);
1655 fb_var_to_videomode(&mode, &var);
1656 if (err || !fb_mode_is_equal(m, &mode)) {
1657 list_del(pos);
1658 kfree(pos);
1659 }
1660 }
1661
1662 err = 1;
1663
1664 if (!list_empty(&info->modelist)) {
1665 event.info = info;
1666 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1667 }
1668
1669 return err;
1670 }
1671
1672 static char *video_options[FB_MAX] __read_mostly;
1673 static int ofonly __read_mostly;
1674
1675 /**
1676 * fb_get_options - get kernel boot parameters
1677 * @name: framebuffer name as it would appear in
1678 * the boot parameter line
1679 * (video=<name>:<options>)
1680 * @option: the option will be stored here
1681 *
1682 * NOTE: Needed to maintain backwards compatibility
1683 */
1684 int fb_get_options(char *name, char **option)
1685 {
1686 char *opt, *options = NULL;
1687 int opt_len, retval = 0;
1688 int name_len = strlen(name), i;
1689
1690 if (name_len && ofonly && strncmp(name, "offb", 4))
1691 retval = 1;
1692
1693 if (name_len && !retval) {
1694 for (i = 0; i < FB_MAX; i++) {
1695 if (video_options[i] == NULL)
1696 continue;
1697 opt_len = strlen(video_options[i]);
1698 if (!opt_len)
1699 continue;
1700 opt = video_options[i];
1701 if (!strncmp(name, opt, name_len) &&
1702 opt[name_len] == ':')
1703 options = opt + name_len + 1;
1704 }
1705 }
1706 if (options && !strncmp(options, "off", 3))
1707 retval = 1;
1708
1709 if (option)
1710 *option = options;
1711
1712 return retval;
1713 }
1714
1715 #ifndef MODULE
1716 /**
1717 * video_setup - process command line options
1718 * @options: string of options
1719 *
1720 * Process command line options for frame buffer subsystem.
1721 *
1722 * NOTE: This function is a __setup and __init function.
1723 * It only stores the options. Drivers have to call
1724 * fb_get_options() as necessary.
1725 *
1726 * Returns zero.
1727 *
1728 */
1729 static int __init video_setup(char *options)
1730 {
1731 int i, global = 0;
1732
1733 if (!options || !*options)
1734 global = 1;
1735
1736 if (!global && !strncmp(options, "ofonly", 6)) {
1737 ofonly = 1;
1738 global = 1;
1739 }
1740
1741 if (!global && !strstr(options, "fb:")) {
1742 fb_mode_option = options;
1743 global = 1;
1744 }
1745
1746 if (!global) {
1747 for (i = 0; i < FB_MAX; i++) {
1748 if (video_options[i] == NULL) {
1749 video_options[i] = options;
1750 break;
1751 }
1752
1753 }
1754 }
1755
1756 return 1;
1757 }
1758 __setup("video=", video_setup);
1759 #endif
1760
1761 /*
1762 * Visible symbols for modules
1763 */
1764
1765 EXPORT_SYMBOL(register_framebuffer);
1766 EXPORT_SYMBOL(unregister_framebuffer);
1767 EXPORT_SYMBOL(num_registered_fb);
1768 EXPORT_SYMBOL(registered_fb);
1769 EXPORT_SYMBOL(fb_show_logo);
1770 EXPORT_SYMBOL(fb_set_var);
1771 EXPORT_SYMBOL(fb_blank);
1772 EXPORT_SYMBOL(fb_pan_display);
1773 EXPORT_SYMBOL(fb_get_buffer_offset);
1774 EXPORT_SYMBOL(fb_set_suspend);
1775 EXPORT_SYMBOL(fb_get_options);
1776
1777 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree