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[PATCH] fbcon: Add ability to save/restore graphics state
[mirror_ubuntu-hirsute-kernel.git] / drivers / video / fbmem.c
CommitLineData
1da177e4
LT		 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/config.h>
15#include <linux/module.h>
16
c7f82d9c 17#include <linux/compat.h>
1da177e4
LT		 18#include <linux/types.h>
19#include <linux/errno.h>
20#include <linux/sched.h>
21#include <linux/smp_lock.h>
22#include <linux/kernel.h>
23#include <linux/major.h>
24#include <linux/slab.h>
25#include <linux/mm.h>
26#include <linux/mman.h>
27#include <linux/tty.h>
28#include <linux/init.h>
29#include <linux/linux_logo.h>
30#include <linux/proc_fs.h>
31#include <linux/console.h>
32#ifdef CONFIG_KMOD
33#include <linux/kmod.h>
34#endif
35#include <linux/devfs_fs_kernel.h>
36#include <linux/err.h>
37#include <linux/kernel.h>
38#include <linux/device.h>
39#include <linux/efi.h>
40
41#if defined(__mc68000__) || defined(CONFIG_APUS)
42#include <asm/setup.h>
43#endif
44
45#include <asm/io.h>
46#include <asm/uaccess.h>
47#include <asm/page.h>
48#include <asm/pgtable.h>
49
50#include <linux/fb.h>
51
52 /*
53 * Frame buffer device initialization and setup routines
54 */
55
56#define FBPIXMAPSIZE (1024 * 8)
57
58static struct notifier_block *fb_notifier_list;
59struct fb_info *registered_fb[FB_MAX];
60int num_registered_fb;
61
62/*
63 * Helpers
64 */
65
b8c90945
AD		 66int fb_get_color_depth(struct fb_var_screeninfo *var,
67 struct fb_fix_screeninfo *fix)
1da177e4 68{
b8c90945
AD		 69 int depth = 0;
70
71 if (fix->visual == FB_VISUAL_MONO01 ||
72 fix->visual == FB_VISUAL_MONO10)
73 depth = 1;
74 else {
75 if (var->green.length == var->blue.length &&
76 var->green.length == var->red.length &&
77 var->green.offset == var->blue.offset &&
78 var->green.offset == var->red.offset)
79 depth = var->green.length;
80 else
81 depth = var->green.length + var->red.length +
82 var->blue.length;
83 }
84
85 return depth;
1da177e4
LT		 86}
87EXPORT_SYMBOL(fb_get_color_depth);
88
89/*
f5a9951c 90 * Data padding functions.
1da177e4 91 */
f1ab5dac 92void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
1da177e4 93{
829e79b6 94 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
1da177e4 95}
f1ab5dac 96EXPORT_SYMBOL(fb_pad_aligned_buffer);
1da177e4 97
f1ab5dac
JS		 98void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
99 u32 shift_high, u32 shift_low, u32 mod)
1da177e4
LT		 100{
101 u8 mask = (u8) (0xfff << shift_high), tmp;
102 int i, j;
103
104 for (i = height; i--; ) {
105 for (j = 0; j < idx; j++) {
106 tmp = dst[j];
107 tmp &= mask;
108 tmp |= *src >> shift_low;
109 dst[j] = tmp;
110 tmp = *src << shift_high;
111 dst[j+1] = tmp;
112 src++;
113 }
114 tmp = dst[idx];
115 tmp &= mask;
116 tmp |= *src >> shift_low;
117 dst[idx] = tmp;
118 if (shift_high < mod) {
119 tmp = *src << shift_high;
120 dst[idx+1] = tmp;
121 }
122 src++;
123 dst += d_pitch;
124 }
125}
f1ab5dac 126EXPORT_SYMBOL(fb_pad_unaligned_buffer);
1da177e4
LT		 127
128/*
129 * we need to lock this section since fb_cursor
130 * may use fb_imageblit()
131 */
132char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
133{
134 u32 align = buf->buf_align - 1, offset;
135 char *addr = buf->addr;
136
137 /* If IO mapped, we need to sync before access, no sharing of
138 * the pixmap is done
139 */
140 if (buf->flags & FB_PIXMAP_IO) {
141 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142 info->fbops->fb_sync(info);
143 return addr;
144 }
145
146 /* See if we fit in the remaining pixmap space */
147 offset = buf->offset + align;
148 offset &= ~align;
149 if (offset + size > buf->size) {
150 /* We do not fit. In order to be able to re-use the buffer,
151 * we must ensure no asynchronous DMA'ing or whatever operation
152 * is in progress, we sync for that.
153 */
154 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
155 info->fbops->fb_sync(info);
156 offset = 0;
157 }
158 buf->offset = offset + size;
159 addr += offset;
160
161 return addr;
162}
163
164#ifdef CONFIG_LOGO
165#include <linux/linux_logo.h>
166
167static inline unsigned safe_shift(unsigned d, int n)
168{
169 return n < 0 ? d >> -n : d << n;
170}
171
172static void fb_set_logocmap(struct fb_info *info,
173 const struct linux_logo *logo)
174{
175 struct fb_cmap palette_cmap;
176 u16 palette_green[16];
177 u16 palette_blue[16];
178 u16 palette_red[16];
179 int i, j, n;
180 const unsigned char *clut = logo->clut;
181
182 palette_cmap.start = 0;
183 palette_cmap.len = 16;
184 palette_cmap.red = palette_red;
185 palette_cmap.green = palette_green;
186 palette_cmap.blue = palette_blue;
187 palette_cmap.transp = NULL;
188
189 for (i = 0; i < logo->clutsize; i += n) {
190 n = logo->clutsize - i;
191 /* palette_cmap provides space for only 16 colors at once */
192 if (n > 16)
193 n = 16;
194 palette_cmap.start = 32 + i;
195 palette_cmap.len = n;
196 for (j = 0; j < n; ++j) {
197 palette_cmap.red[j] = clut[0] << 8 | clut[0];
198 palette_cmap.green[j] = clut[1] << 8 | clut[1];
199 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
200 clut += 3;
201 }
202 fb_set_cmap(&palette_cmap, info);
203 }
204}
205
206static void fb_set_logo_truepalette(struct fb_info *info,
207 const struct linux_logo *logo,
208 u32 *palette)
209{
210 unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
211 unsigned char redmask, greenmask, bluemask;
212 int redshift, greenshift, blueshift;
213 int i;
214 const unsigned char *clut = logo->clut;
215
216 /*
217 * We have to create a temporary palette since console palette is only
218 * 16 colors long.
219 */
220 /* Bug: Doesn't obey msb_right ... (who needs that?) */
221 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
222 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
223 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
224 redshift = info->var.red.offset - (8 - info->var.red.length);
225 greenshift = info->var.green.offset - (8 - info->var.green.length);
226 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
227
228 for ( i = 0; i < logo->clutsize; i++) {
229 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
230 safe_shift((clut[1] & greenmask), greenshift) |
231 safe_shift((clut[2] & bluemask), blueshift));
232 clut += 3;
233 }
234}
235
236static void fb_set_logo_directpalette(struct fb_info *info,
237 const struct linux_logo *logo,
238 u32 *palette)
239{
240 int redshift, greenshift, blueshift;
241 int i;
242
243 redshift = info->var.red.offset;
244 greenshift = info->var.green.offset;
245 blueshift = info->var.blue.offset;
246
247 for (i = 32; i < logo->clutsize; i++)
248 palette[i] = i << redshift | i << greenshift | i << blueshift;
249}
250
251static void fb_set_logo(struct fb_info *info,
252 const struct linux_logo *logo, u8 *dst,
253 int depth)
254{
b8c90945 255 int i, j, k;
1da177e4 256 const u8 *src = logo->data;
b8c90945
AD		 257 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
258 u8 fg = 1, d;
1da177e4 259
b8c90945 260 if (fb_get_color_depth(&info->var, &info->fix) == 3)
1da177e4
LT		 261 fg = 7;
262
b8c90945
AD		 263 if (info->fix.visual == FB_VISUAL_MONO01 ||
264 info->fix.visual == FB_VISUAL_MONO10)
265 fg = ~((u8) (0xfff << info->var.green.length));
266
1da177e4
LT		 267 switch (depth) {
268 case 4:
269 for (i = 0; i < logo->height; i++)
270 for (j = 0; j < logo->width; src++) {
271 *dst++ = *src >> 4;
272 j++;
273 if (j < logo->width) {
274 *dst++ = *src & 0x0f;
275 j++;
276 }
277 }
278 break;
279 case 1:
280 for (i = 0; i < logo->height; i++) {
281 for (j = 0; j < logo->width; src++) {
282 d = *src ^ xor;
283 for (k = 7; k >= 0; k--) {
284 *dst++ = ((d >> k) & 1) ? fg : 0;
285 j++;
286 }
287 }
288 }
289 break;
290 }
291}
292
293/*
294 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
295 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
296 * the visual format and color depth of the framebuffer, the DAC, the
297 * pseudo_palette, and the logo data will be adjusted accordingly.
298 *
299 * Case 1 - linux_logo_clut224:
300 * Color exceeds the number of console colors (16), thus we set the hardware DAC
301 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
302 *
303 * For visuals that require color info from the pseudo_palette, we also construct
304 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
305 * will be set.
306 *
307 * Case 2 - linux_logo_vga16:
308 * The number of colors just matches the console colors, thus there is no need
309 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
310 * each byte contains color information for two pixels (upper and lower nibble).
311 * To be consistent with fb_imageblit() usage, we therefore separate the two
312 * nibbles into separate bytes. The "depth" flag will be set to 4.
313 *
314 * Case 3 - linux_logo_mono:
315 * This is similar with Case 2. Each byte contains information for 8 pixels.
316 * We isolate each bit and expand each into a byte. The "depth" flag will
317 * be set to 1.
318 */
319static struct logo_data {
320 int depth;
321 int needs_directpalette;
322 int needs_truepalette;
323 int needs_cmapreset;
324 const struct linux_logo *logo;
325} fb_logo;
326
9c44e5f6
AD		 327static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
328{
329 u32 size = width * height, i;
330
331 out += size - 1;
332
333 for (i = size; i--; )
334 *out-- = *in++;
335}
336
337static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
338{
339 int i, j, w = width - 1;
340
341 for (i = 0; i < height; i++)
342 for (j = 0; j < width; j++)
343 out[height * j + w - i] = *in++;
344}
345
346static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
347{
348 int i, j, w = width - 1;
349
350 for (i = 0; i < height; i++)
351 for (j = 0; j < width; j++)
352 out[height * (w - j) + i] = *in++;
353}
354
355static void fb_rotate_logo(struct fb_info *info, u8 *dst,
356 struct fb_image *image, int rotate)
357{
358 u32 tmp;
359
360 if (rotate == FB_ROTATE_UD) {
361 image->dx = info->var.xres - image->width;
362 image->dy = info->var.yres - image->height;
363 fb_rotate_logo_ud(image->data, dst, image->width,
364 image->height);
365 } else if (rotate == FB_ROTATE_CW) {
366 tmp = image->width;
367 image->width = image->height;
368 image->height = tmp;
369 image->dx = info->var.xres - image->height;
370 fb_rotate_logo_cw(image->data, dst, image->width,
371 image->height);
372 } else if (rotate == FB_ROTATE_CCW) {
373 tmp = image->width;
374 image->width = image->height;
375 image->height = tmp;
376 image->dy = info->var.yres - image->width;
377 fb_rotate_logo_ccw(image->data, dst, image->width,
378 image->height);
379 }
380
381 image->data = dst;
382}
383
384static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
385 int rotate)
386{
387 int x;
388
389 if (rotate == FB_ROTATE_UR) {
390 for (x = 0; x < num_online_cpus() &&
391 x * (fb_logo.logo->width + 8) <=
392 info->var.xres - fb_logo.logo->width; x++) {
393 info->fbops->fb_imageblit(info, image);
394 image->dx += fb_logo.logo->width + 8;
395 }
396 } else if (rotate == FB_ROTATE_UD) {
397 for (x = 0; x < num_online_cpus() &&
398 x * (fb_logo.logo->width + 8) <=
399 info->var.xres - fb_logo.logo->width; x++) {
400 info->fbops->fb_imageblit(info, image);
401 image->dx -= fb_logo.logo->width + 8;
402 }
403 } else if (rotate == FB_ROTATE_CW) {
404 for (x = 0; x < num_online_cpus() &&
405 x * (fb_logo.logo->width + 8) <=
406 info->var.yres - fb_logo.logo->width; x++) {
407 info->fbops->fb_imageblit(info, image);
408 image->dy += fb_logo.logo->width + 8;
409 }
410 } else if (rotate == FB_ROTATE_CCW) {
411 for (x = 0; x < num_online_cpus() &&
412 x * (fb_logo.logo->width + 8) <=
413 info->var.yres - fb_logo.logo->width; x++) {
414 info->fbops->fb_imageblit(info, image);
415 image->dy -= fb_logo.logo->width + 8;
416 }
417 }
418}
419
420int fb_prepare_logo(struct fb_info *info, int rotate)
1da177e4 421{
b8c90945 422 int depth = fb_get_color_depth(&info->var, &info->fix);
9c44e5f6 423 int yres;
1da177e4
LT		 424
425 memset(&fb_logo, 0, sizeof(struct logo_data));
426
427 if (info->flags & FBINFO_MISC_TILEBLITTING)
428 return 0;
429
430 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
431 depth = info->var.blue.length;
432 if (info->var.red.length < depth)
433 depth = info->var.red.length;
434 if (info->var.green.length < depth)
435 depth = info->var.green.length;
436 }
437
438 if (depth >= 8) {
439 switch (info->fix.visual) {
440 case FB_VISUAL_TRUECOLOR:
441 fb_logo.needs_truepalette = 1;
442 break;
443 case FB_VISUAL_DIRECTCOLOR:
444 fb_logo.needs_directpalette = 1;
445 fb_logo.needs_cmapreset = 1;
446 break;
447 case FB_VISUAL_PSEUDOCOLOR:
448 fb_logo.needs_cmapreset = 1;
449 break;
450 }
451 }
452
453 /* Return if no suitable logo was found */
454 fb_logo.logo = fb_find_logo(depth);
6d9885a8
JS		 455
456 if (!fb_logo.logo) {
457 return 0;
458 }
1da177e4 459
9c44e5f6
AD		 460 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
461 yres = info->var.yres;
462 else
463 yres = info->var.xres;
464
6d9885a8 465 if (fb_logo.logo->height > yres) {
1da177e4
LT		 466 fb_logo.logo = NULL;
467 return 0;
468 }
9c44e5f6 469
1da177e4
LT		 470 /* What depth we asked for might be different from what we get */
471 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
472 fb_logo.depth = 8;
473 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
474 fb_logo.depth = 4;
475 else
476 fb_logo.depth = 1;
477 return fb_logo.logo->height;
478}
479
9c44e5f6 480int fb_show_logo(struct fb_info *info, int rotate)
1da177e4
LT		 481{
482 u32 *palette = NULL, *saved_pseudo_palette = NULL;
9c44e5f6 483 unsigned char *logo_new = NULL, *logo_rotate = NULL;
1da177e4 484 struct fb_image image;
1da177e4
LT		 485
486 /* Return if the frame buffer is not mapped or suspended */
487 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
488 return 0;
489
490 image.depth = 8;
491 image.data = fb_logo.logo->data;
492
493 if (fb_logo.needs_cmapreset)
494 fb_set_logocmap(info, fb_logo.logo);
495
496 if (fb_logo.needs_truepalette ||
497 fb_logo.needs_directpalette) {
498 palette = kmalloc(256 * 4, GFP_KERNEL);
499 if (palette == NULL)
500 return 0;
501
502 if (fb_logo.needs_truepalette)
503 fb_set_logo_truepalette(info, fb_logo.logo, palette);
504 else
505 fb_set_logo_directpalette(info, fb_logo.logo, palette);
506
507 saved_pseudo_palette = info->pseudo_palette;
508 info->pseudo_palette = palette;
509 }
510
511 if (fb_logo.depth <= 4) {
512 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
513 GFP_KERNEL);
514 if (logo_new == NULL) {
515 kfree(palette);
516 if (saved_pseudo_palette)
517 info->pseudo_palette = saved_pseudo_palette;
518 return 0;
519 }
520 image.data = logo_new;
521 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
522 }
523
9c44e5f6
AD		 524 image.dx = 0;
525 image.dy = 0;
1da177e4
LT		 526 image.width = fb_logo.logo->width;
527 image.height = fb_logo.logo->height;
1da177e4 528
9c44e5f6
AD		 529 if (rotate) {
530 logo_rotate = kmalloc(fb_logo.logo->width *
531 fb_logo.logo->height, GFP_KERNEL);
532 if (logo_rotate)
533 fb_rotate_logo(info, logo_rotate, &image, rotate);
1da177e4 534 }
9c44e5f6
AD		 535
536 fb_do_show_logo(info, &image, rotate);
537
1da177e4
LT		 538 kfree(palette);
539 if (saved_pseudo_palette != NULL)
540 info->pseudo_palette = saved_pseudo_palette;
541 kfree(logo_new);
9c44e5f6 542 kfree(logo_rotate);
1da177e4
LT		 543 return fb_logo.logo->height;
544}
545#else
9c44e5f6
AD		 546int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
547int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
1da177e4
LT		 548#endif /* CONFIG_LOGO */
549
550static int fbmem_read_proc(char *buf, char **start, off_t offset,
551 int len, int *eof, void *private)
552{
553 struct fb_info **fi;
554 int clen;
555
556 clen = 0;
557 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
558 if (*fi)
559 clen += sprintf(buf + clen, "%d %s\n",
560 (*fi)->node,
561 (*fi)->fix.id);
562 *start = buf + offset;
563 if (clen > offset)
564 clen -= offset;
565 else
566 clen = 0;
567 return clen < len ? clen : len;
568}
569
570static ssize_t
571fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
572{
573 unsigned long p = *ppos;
574 struct inode *inode = file->f_dentry->d_inode;
575 int fbidx = iminor(inode);
576 struct fb_info *info = registered_fb[fbidx];
577 u32 *buffer, *dst;
578 u32 __iomem *src;
579 int c, i, cnt = 0, err = 0;
580 unsigned long total_size;
581
582 if (!info || ! info->screen_base)
583 return -ENODEV;
584
585 if (info->state != FBINFO_STATE_RUNNING)
586 return -EPERM;
587
588 if (info->fbops->fb_read)
589 return info->fbops->fb_read(file, buf, count, ppos);
590
591 total_size = info->screen_size;
592 if (total_size == 0)
593 total_size = info->fix.smem_len;
594
595 if (p >= total_size)
596 return 0;
597 if (count >= total_size)
598 count = total_size;
599 if (count + p > total_size)
600 count = total_size - p;
601
602 cnt = 0;
603 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
604 GFP_KERNEL);
605 if (!buffer)
606 return -ENOMEM;
607
608 src = (u32 __iomem *) (info->screen_base + p);
609
610 if (info->fbops->fb_sync)
611 info->fbops->fb_sync(info);
612
613 while (count) {
614 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
615 dst = buffer;
616 for (i = c >> 2; i--; )
617 *dst++ = fb_readl(src++);
618 if (c & 3) {
619 u8 *dst8 = (u8 *) dst;
620 u8 __iomem *src8 = (u8 __iomem *) src;
621
622 for (i = c & 3; i--;)
623 *dst8++ = fb_readb(src8++);
624
625 src = (u32 __iomem *) src8;
626 }
627
628 if (copy_to_user(buf, buffer, c)) {
629 err = -EFAULT;
630 break;
631 }
632 *ppos += c;
633 buf += c;
634 cnt += c;
635 count -= c;
636 }
637
638 kfree(buffer);
639 return (err) ? err : cnt;
640}
641
642static ssize_t
643fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
644{
645 unsigned long p = *ppos;
646 struct inode *inode = file->f_dentry->d_inode;
647 int fbidx = iminor(inode);
648 struct fb_info *info = registered_fb[fbidx];
649 u32 *buffer, *src;
650 u32 __iomem *dst;
651 int c, i, cnt = 0, err;
652 unsigned long total_size;
653
654 if (!info || !info->screen_base)
655 return -ENODEV;
656
657 if (info->state != FBINFO_STATE_RUNNING)
658 return -EPERM;
659
660 if (info->fbops->fb_write)
661 return info->fbops->fb_write(file, buf, count, ppos);
662
663 total_size = info->screen_size;
664 if (total_size == 0)
665 total_size = info->fix.smem_len;
666
667 if (p > total_size)
668 return -ENOSPC;
669 if (count >= total_size)
670 count = total_size;
671 err = 0;
672 if (count + p > total_size) {
673 count = total_size - p;
674 err = -ENOSPC;
675 }
676 cnt = 0;
677 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
678 GFP_KERNEL);
679 if (!buffer)
680 return -ENOMEM;
681
682 dst = (u32 __iomem *) (info->screen_base + p);
683
684 if (info->fbops->fb_sync)
685 info->fbops->fb_sync(info);
686
687 while (count) {
688 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
689 src = buffer;
690 if (copy_from_user(src, buf, c)) {
691 err = -EFAULT;
692 break;
693 }
694 for (i = c >> 2; i--; )
695 fb_writel(*src++, dst++);
696 if (c & 3) {
697 u8 *src8 = (u8 *) src;
698 u8 __iomem *dst8 = (u8 __iomem *) dst;
699
700 for (i = c & 3; i--; )
701 fb_writeb(*src8++, dst8++);
702
703 dst = (u32 __iomem *) dst8;
704 }
705 *ppos += c;
706 buf += c;
707 cnt += c;
708 count -= c;
709 }
710 kfree(buffer);
711
712 return (err) ? err : cnt;
713}
714
715#ifdef CONFIG_KMOD
716static void try_to_load(int fb)
717{
718 request_module("fb%d", fb);
719}
720#endif /* CONFIG_KMOD */
721
722int
723fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
724{
725 int xoffset = var->xoffset;
726 int yoffset = var->yoffset;
727 int err;
728
729 if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
730 xoffset + info->var.xres > info->var.xres_virtual ||
731 yoffset + info->var.yres > info->var.yres_virtual)
732 return -EINVAL;
733 if ((err = info->fbops->fb_pan_display(var, info)))
734 return err;
735 info->var.xoffset = var->xoffset;
736 info->var.yoffset = var->yoffset;
737 if (var->vmode & FB_VMODE_YWRAP)
738 info->var.vmode |= FB_VMODE_YWRAP;
739 else
740 info->var.vmode &= ~FB_VMODE_YWRAP;
741 return 0;
742}
743
744int
745fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
746{
3edea483 747 int err, flags = info->flags;
1da177e4
LT		 748
749 if (var->activate & FB_ACTIVATE_INV_MODE) {
750 struct fb_videomode mode1, mode2;
751 int ret = 0;
752
753 fb_var_to_videomode(&mode1, var);
754 fb_var_to_videomode(&mode2, &info->var);
755 /* make sure we don't delete the videomode of current var */
756 ret = fb_mode_is_equal(&mode1, &mode2);
757
758 if (!ret) {
759 struct fb_event event;
760
761 event.info = info;
762 event.data = &mode1;
763 ret = notifier_call_chain(&fb_notifier_list,
764 FB_EVENT_MODE_DELETE, &event);
765 }
766
767 if (!ret)
768 fb_delete_videomode(&mode1, &info->modelist);
769
770 return ret;
771 }
772
773 if ((var->activate & FB_ACTIVATE_FORCE) ||
774 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
775 if (!info->fbops->fb_check_var) {
776 *var = info->var;
777 return 0;
778 }
779
780 if ((err = info->fbops->fb_check_var(var, info)))
781 return err;
782
783 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
784 struct fb_videomode mode;
785 int err = 0;
786
787 info->var = *var;
788 if (info->fbops->fb_set_par)
789 info->fbops->fb_set_par(info);
790
791 fb_pan_display(info, &info->var);
792
793 fb_set_cmap(&info->cmap, info);
794
795 fb_var_to_videomode(&mode, &info->var);
796
797 if (info->modelist.prev && info->modelist.next &&
798 !list_empty(&info->modelist))
799 err = fb_add_videomode(&mode, &info->modelist);
800
3edea483 801 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
1da177e4 802 struct fb_event event;
7726e9e1
AD		 803 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
804 FB_EVENT_MODE_CHANGE_ALL :
805 FB_EVENT_MODE_CHANGE;
1da177e4
LT		 806
807 info->flags &= ~FBINFO_MISC_USEREVENT;
808 event.info = info;
7726e9e1 809 notifier_call_chain(&fb_notifier_list, evnt,
1da177e4
LT		 810 &event);
811 }
812 }
813 }
814 return 0;
815}
816
817int
818fb_blank(struct fb_info *info, int blank)
819{
820 int ret = -EINVAL;
821
822 if (blank > FB_BLANK_POWERDOWN)
823 blank = FB_BLANK_POWERDOWN;
824
825 if (info->fbops->fb_blank)
826 ret = info->fbops->fb_blank(blank, info);
827
828 if (!ret) {
829 struct fb_event event;
830
831 event.info = info;
832 event.data = &blank;
833 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
834 }
835
836 return ret;
837}
838
839static int
840fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
841 unsigned long arg)
842{
843 int fbidx = iminor(inode);
844 struct fb_info *info = registered_fb[fbidx];
845 struct fb_ops *fb = info->fbops;
846 struct fb_var_screeninfo var;
847 struct fb_fix_screeninfo fix;
848 struct fb_con2fbmap con2fb;
849 struct fb_cmap_user cmap;
850 struct fb_event event;
851 void __user *argp = (void __user *)arg;
852 int i;
853
854 if (!fb)
855 return -ENODEV;
856 switch (cmd) {
857 case FBIOGET_VSCREENINFO:
858 return copy_to_user(argp, &info->var,
859 sizeof(var)) ? -EFAULT : 0;
860 case FBIOPUT_VSCREENINFO:
861 if (copy_from_user(&var, argp, sizeof(var)))
862 return -EFAULT;
863 acquire_console_sem();
864 info->flags |= FBINFO_MISC_USEREVENT;
865 i = fb_set_var(info, &var);
866 info->flags &= ~FBINFO_MISC_USEREVENT;
867 release_console_sem();
868 if (i) return i;
869 if (copy_to_user(argp, &var, sizeof(var)))
870 return -EFAULT;
871 return 0;
872 case FBIOGET_FSCREENINFO:
873 return copy_to_user(argp, &info->fix,
874 sizeof(fix)) ? -EFAULT : 0;
875 case FBIOPUTCMAP:
876 if (copy_from_user(&cmap, argp, sizeof(cmap)))
877 return -EFAULT;
878 return (fb_set_user_cmap(&cmap, info));
879 case FBIOGETCMAP:
880 if (copy_from_user(&cmap, argp, sizeof(cmap)))
881 return -EFAULT;
882 return fb_cmap_to_user(&info->cmap, &cmap);
883 case FBIOPAN_DISPLAY:
884 if (copy_from_user(&var, argp, sizeof(var)))
885 return -EFAULT;
886 acquire_console_sem();
887 i = fb_pan_display(info, &var);
888 release_console_sem();
889 if (i)
890 return i;
891 if (copy_to_user(argp, &var, sizeof(var)))
892 return -EFAULT;
893 return 0;
894 case FBIO_CURSOR:
895 return -EINVAL;
896 case FBIOGET_CON2FBMAP:
897 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
898 return -EFAULT;
899 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
900 return -EINVAL;
901 con2fb.framebuffer = -1;
902 event.info = info;
903 event.data = &con2fb;
904 notifier_call_chain(&fb_notifier_list,
905 FB_EVENT_GET_CONSOLE_MAP, &event);
906 return copy_to_user(argp, &con2fb,
907 sizeof(con2fb)) ? -EFAULT : 0;
908 case FBIOPUT_CON2FBMAP:
909 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
910 return - EFAULT;
911 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
912 return -EINVAL;
913 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
914 return -EINVAL;
915#ifdef CONFIG_KMOD
916 if (!registered_fb[con2fb.framebuffer])
917 try_to_load(con2fb.framebuffer);
918#endif /* CONFIG_KMOD */
919 if (!registered_fb[con2fb.framebuffer])
920 return -EINVAL;
921 event.info = info;
922 event.data = &con2fb;
923 return notifier_call_chain(&fb_notifier_list,
924 FB_EVENT_SET_CONSOLE_MAP,
925 &event);
926 case FBIOBLANK:
927 acquire_console_sem();
928 info->flags |= FBINFO_MISC_USEREVENT;
929 i = fb_blank(info, arg);
930 info->flags &= ~FBINFO_MISC_USEREVENT;
931 release_console_sem();
932 return i;
933 default:
934 if (fb->fb_ioctl == NULL)
935 return -EINVAL;
936 return fb->fb_ioctl(inode, file, cmd, arg, info);
937 }
938}
939
940#ifdef CONFIG_COMPAT
c7f82d9c
AB		 941struct fb_fix_screeninfo32 {
942 char id[16];
943 compat_caddr_t smem_start;
944 u32 smem_len;
945 u32 type;
946 u32 type_aux;
947 u32 visual;
948 u16 xpanstep;
949 u16 ypanstep;
950 u16 ywrapstep;
951 u32 line_length;
952 compat_caddr_t mmio_start;
953 u32 mmio_len;
954 u32 accel;
955 u16 reserved[3];
956};
957
958struct fb_cmap32 {
959 u32 start;
960 u32 len;
961 compat_caddr_t red;
962 compat_caddr_t green;
963 compat_caddr_t blue;
964 compat_caddr_t transp;
965};
966
967static int fb_getput_cmap(struct inode *inode, struct file *file,
968 unsigned int cmd, unsigned long arg)
969{
970 struct fb_cmap_user __user *cmap;
971 struct fb_cmap32 __user *cmap32;
972 __u32 data;
973 int err;
974
975 cmap = compat_alloc_user_space(sizeof(*cmap));
976 cmap32 = compat_ptr(arg);
977
978 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
979 return -EFAULT;
980
981 if (get_user(data, &cmap32->red) ||
982 put_user(compat_ptr(data), &cmap->red) ||
983 get_user(data, &cmap32->green) ||
984 put_user(compat_ptr(data), &cmap->green) ||
985 get_user(data, &cmap32->blue) ||
986 put_user(compat_ptr(data), &cmap->blue) ||
987 get_user(data, &cmap32->transp) ||
988 put_user(compat_ptr(data), &cmap->transp))
989 return -EFAULT;
990
991 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
992
993 if (!err) {
994 if (copy_in_user(&cmap32->start,
995 &cmap->start,
996 2 * sizeof(__u32)))
997 err = -EFAULT;
998 }
999 return err;
1000}
1001
1002static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1003 struct fb_fix_screeninfo32 __user *fix32)
1004{
1005 __u32 data;
1006 int err;
1007
1008 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1009
1010 data = (__u32) (unsigned long) fix->smem_start;
1011 err |= put_user(data, &fix32->smem_start);
1012
1013 err |= put_user(fix->smem_len, &fix32->smem_len);
1014 err |= put_user(fix->type, &fix32->type);
1015 err |= put_user(fix->type_aux, &fix32->type_aux);
1016 err |= put_user(fix->visual, &fix32->visual);
1017 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1018 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1019 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1020 err |= put_user(fix->line_length, &fix32->line_length);
1021
1022 data = (__u32) (unsigned long) fix->mmio_start;
1023 err |= put_user(data, &fix32->mmio_start);
1024
1025 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1026 err |= put_user(fix->accel, &fix32->accel);
1027 err |= copy_to_user(fix32->reserved, fix->reserved,
1028 sizeof(fix->reserved));
1029
1030 return err;
1031}
1032
1033static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1034 unsigned int cmd, unsigned long arg)
1035{
1036 mm_segment_t old_fs;
1037 struct fb_fix_screeninfo fix;
1038 struct fb_fix_screeninfo32 __user *fix32;
1039 int err;
1040
1041 fix32 = compat_ptr(arg);
1042
1043 old_fs = get_fs();
1044 set_fs(KERNEL_DS);
1045 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1046 set_fs(old_fs);
1047
1048 if (!err)
1049 err = do_fscreeninfo_to_user(&fix, fix32);
1050
1051 return err;
1052}
1053
1da177e4
LT		 1054static long
1055fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1056{
c7f82d9c
AB		 1057 struct inode *inode = file->f_dentry->d_inode;
1058 int fbidx = iminor(inode);
1da177e4
LT		 1059 struct fb_info *info = registered_fb[fbidx];
1060 struct fb_ops *fb = info->fbops;
c7f82d9c 1061 long ret = -ENOIOCTLCMD;
1da177e4 1062
1da177e4 1063 lock_kernel();
c7f82d9c
AB		 1064 switch(cmd) {
1065 case FBIOGET_VSCREENINFO:
1066 case FBIOPUT_VSCREENINFO:
1067 case FBIOPAN_DISPLAY:
1068 case FBIOGET_CON2FBMAP:
1069 case FBIOPUT_CON2FBMAP:
1070 arg = (unsigned long) compat_ptr(arg);
1071 case FBIOBLANK:
1072 ret = fb_ioctl(inode, file, cmd, arg);
1073 break;
1074
1075 case FBIOGET_FSCREENINFO:
1076 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1077 break;
1078
1079 case FBIOGETCMAP:
1080 case FBIOPUTCMAP:
1081 ret = fb_getput_cmap(inode, file, cmd, arg);
1082 break;
1083
1084 default:
1085 if (fb->fb_compat_ioctl)
1086 ret = fb->fb_compat_ioctl(file, cmd, arg, info);
1087 break;
1088 }
1da177e4
LT		 1089 unlock_kernel();
1090 return ret;
1091}
1092#endif
1093
1094static int
1095fb_mmap(struct file *file, struct vm_area_struct * vma)
1096{
1097 int fbidx = iminor(file->f_dentry->d_inode);
1098 struct fb_info *info = registered_fb[fbidx];
1099 struct fb_ops *fb = info->fbops;
1100 unsigned long off;
1101#if !defined(__sparc__) || defined(__sparc_v9__)
1102 unsigned long start;
1103 u32 len;
1104#endif
1105
1106 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1107 return -EINVAL;
1108 off = vma->vm_pgoff << PAGE_SHIFT;
1109 if (!fb)
1110 return -ENODEV;
1111 if (fb->fb_mmap) {
1112 int res;
1113 lock_kernel();
1114 res = fb->fb_mmap(info, file, vma);
1115 unlock_kernel();
1116 return res;
1117 }
1118
1119#if defined(__sparc__) && !defined(__sparc_v9__)
1120 /* Should never get here, all fb drivers should have their own
1121 mmap routines */
1122 return -EINVAL;
1123#else
1124 /* !sparc32... */
1125 lock_kernel();
1126
1127 /* frame buffer memory */
1128 start = info->fix.smem_start;
1129 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1130 if (off >= len) {
1131 /* memory mapped io */
1132 off -= len;
1133 if (info->var.accel_flags) {
1134 unlock_kernel();
1135 return -EINVAL;
1136 }
1137 start = info->fix.mmio_start;
1138 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1139 }
1140 unlock_kernel();
1141 start &= PAGE_MASK;
1142 if ((vma->vm_end - vma->vm_start + off) > len)
1143 return -EINVAL;
1144 off += start;
1145 vma->vm_pgoff = off >> PAGE_SHIFT;
1146 /* This is an IO map - tell maydump to skip this VMA */
1147 vma->vm_flags |= VM_IO | VM_RESERVED;
1148#if defined(__sparc_v9__)
1149 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1150 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1151 return -EAGAIN;
1152#else
1153#if defined(__mc68000__)
1154#if defined(CONFIG_SUN3)
1155 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1156#elif defined(CONFIG_MMU)
1157 if (CPU_IS_020_OR_030)
1158 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1159 if (CPU_IS_040_OR_060) {
1160 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1161 /* Use no-cache mode, serialized */
1162 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1163 }
1164#endif
1165#elif defined(__powerpc__)
8b150478 1166 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1da177e4
LT		 1167 vma->vm_end - vma->vm_start,
1168 vma->vm_page_prot);
1169#elif defined(__alpha__)
1170 /* Caching is off in the I/O space quadrant by design. */
1171#elif defined(__i386__) || defined(__x86_64__)
1172 if (boot_cpu_data.x86 > 3)
1173 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1174#elif defined(__mips__)
1175 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1176#elif defined(__hppa__)
1177 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1178#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1179 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1180#elif defined(__ia64__)
1181 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1182 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1183 else
1184 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1185#else
1186#warning What do we have to do here??
1187#endif
1188 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1189 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1190 return -EAGAIN;
1191#endif /* !__sparc_v9__ */
1192 return 0;
1193#endif /* !sparc32 */
1194}
1195
1196static int
1197fb_open(struct inode *inode, struct file *file)
1198{
1199 int fbidx = iminor(inode);
1200 struct fb_info *info;
1201 int res = 0;
1202
1203 if (fbidx >= FB_MAX)
1204 return -ENODEV;
1205#ifdef CONFIG_KMOD
1206 if (!(info = registered_fb[fbidx]))
1207 try_to_load(fbidx);
1208#endif /* CONFIG_KMOD */
1209 if (!(info = registered_fb[fbidx]))
1210 return -ENODEV;
1211 if (!try_module_get(info->fbops->owner))
1212 return -ENODEV;
1213 if (info->fbops->fb_open) {
1214 res = info->fbops->fb_open(info,1);
1215 if (res)
1216 module_put(info->fbops->owner);
1217 }
1218 return res;
1219}
1220
1221static int
1222fb_release(struct inode *inode, struct file *file)
1223{
1224 int fbidx = iminor(inode);
1225 struct fb_info *info;
1226
1227 lock_kernel();
1228 info = registered_fb[fbidx];
1229 if (info->fbops->fb_release)
1230 info->fbops->fb_release(info,1);
1231 module_put(info->fbops->owner);
1232 unlock_kernel();
1233 return 0;
1234}
1235
1236static struct file_operations fb_fops = {
1237 .owner = THIS_MODULE,
1238 .read = fb_read,
1239 .write = fb_write,
1240 .ioctl = fb_ioctl,
1241#ifdef CONFIG_COMPAT
1242 .compat_ioctl = fb_compat_ioctl,
1243#endif
1244 .mmap = fb_mmap,
1245 .open = fb_open,
1246 .release = fb_release,
1247#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1248 .get_unmapped_area = get_fb_unmapped_area,
1249#endif
1250};
1251
56b22935 1252static struct class *fb_class;
1da177e4
LT		 1253
1254/**
1255 * register_framebuffer - registers a frame buffer device
1256 * @fb_info: frame buffer info structure
1257 *
1258 * Registers a frame buffer device @fb_info.
1259 *
1260 * Returns negative errno on error, or zero for success.
1261 *
1262 */
1263
1264int
1265register_framebuffer(struct fb_info *fb_info)
1266{
1267 int i;
1268 struct fb_event event;
96fe6a21 1269 struct fb_videomode mode;
1da177e4
LT		 1270
1271 if (num_registered_fb == FB_MAX)
1272 return -ENXIO;
1273 num_registered_fb++;
1274 for (i = 0 ; i < FB_MAX; i++)
1275 if (!registered_fb[i])
1276 break;
1277 fb_info->node = i;
1278
53f46542 1279 fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1da177e4
LT		 1280 fb_info->device, "fb%d", i);
1281 if (IS_ERR(fb_info->class_device)) {
1282 /* Not fatal */
1283 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1284 fb_info->class_device = NULL;
1285 } else
1286 fb_init_class_device(fb_info);
1287
1288 if (fb_info->pixmap.addr == NULL) {
1289 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1290 if (fb_info->pixmap.addr) {
1291 fb_info->pixmap.size = FBPIXMAPSIZE;
1292 fb_info->pixmap.buf_align = 1;
1293 fb_info->pixmap.scan_align = 1;
58a60643 1294 fb_info->pixmap.access_align = 32;
1da177e4
LT		 1295 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1296 }
1297 }
1298 fb_info->pixmap.offset = 0;
1299
96fe6a21 1300 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1da177e4 1301 INIT_LIST_HEAD(&fb_info->modelist);
1da177e4 1302
96fe6a21
AD		 1303 fb_var_to_videomode(&mode, &fb_info->var);
1304 fb_add_videomode(&mode, &fb_info->modelist);
1da177e4
LT		 1305 registered_fb[i] = fb_info;
1306
1307 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1308 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1309 event.info = fb_info;
1310 notifier_call_chain(&fb_notifier_list,
1311 FB_EVENT_FB_REGISTERED, &event);
1312 return 0;
1313}
1314
1315
1316/**
1317 * unregister_framebuffer - releases a frame buffer device
1318 * @fb_info: frame buffer info structure
1319 *
1320 * Unregisters a frame buffer device @fb_info.
1321 *
1322 * Returns negative errno on error, or zero for success.
1323 *
1324 */
1325
1326int
1327unregister_framebuffer(struct fb_info *fb_info)
1328{
1329 int i;
1330
1331 i = fb_info->node;
1332 if (!registered_fb[i])
1333 return -EINVAL;
1334 devfs_remove("fb/%d", i);
1335
1336 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1337 kfree(fb_info->pixmap.addr);
1338 fb_destroy_modelist(&fb_info->modelist);
1339 registered_fb[i]=NULL;
1340 num_registered_fb--;
1341 fb_cleanup_class_device(fb_info);
56b22935 1342 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1da177e4
LT		 1343 return 0;
1344}
1345
1346/**
1347 * fb_register_client - register a client notifier
1348 * @nb: notifier block to callback on events
1349 */
1350int fb_register_client(struct notifier_block *nb)
1351{
1352 return notifier_chain_register(&fb_notifier_list, nb);
1353}
1354
1355/**
1356 * fb_unregister_client - unregister a client notifier
1357 * @nb: notifier block to callback on events
1358 */
1359int fb_unregister_client(struct notifier_block *nb)
1360{
1361 return notifier_chain_unregister(&fb_notifier_list, nb);
1362}
1363
1364/**
1365 * fb_set_suspend - low level driver signals suspend
1366 * @info: framebuffer affected
1367 * @state: 0 = resuming, !=0 = suspending
1368 *
1369 * This is meant to be used by low level drivers to
1370 * signal suspend/resume to the core & clients.
1371 * It must be called with the console semaphore held
1372 */
1373void fb_set_suspend(struct fb_info *info, int state)
1374{
1375 struct fb_event event;
1376
1377 event.info = info;
1378 if (state) {
1379 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1380 info->state = FBINFO_STATE_SUSPENDED;
1381 } else {
1382 info->state = FBINFO_STATE_RUNNING;
1383 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1384 }
1385}
1386
1387/**
1388 * fbmem_init - init frame buffer subsystem
1389 *
1390 * Initialize the frame buffer subsystem.
1391 *
1392 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1393 *
1394 */
1395
1396static int __init
1397fbmem_init(void)
1398{
1399 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1400
1401 devfs_mk_dir("fb");
1402 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1403 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1404
56b22935 1405 fb_class = class_create(THIS_MODULE, "graphics");
1da177e4
LT		 1406 if (IS_ERR(fb_class)) {
1407 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1408 fb_class = NULL;
1409 }
1410 return 0;
1411}
1412
1413#ifdef MODULE
1414module_init(fbmem_init);
1415static void __exit
1416fbmem_exit(void)
1417{
56b22935 1418 class_destroy(fb_class);
5a340cce 1419 unregister_chrdev(FB_MAJOR, "fb");
1da177e4
LT		 1420}
1421
1422module_exit(fbmem_exit);
1423MODULE_LICENSE("GPL");
1424MODULE_DESCRIPTION("Framebuffer base");
1425#else
1426subsys_initcall(fbmem_init);
1427#endif
1428
1429int fb_new_modelist(struct fb_info *info)
1430{
1431 struct fb_event event;
1432 struct fb_var_screeninfo var = info->var;
1433 struct list_head *pos, *n;
1434 struct fb_modelist *modelist;
1435 struct fb_videomode *m, mode;
1436 int err = 1;
1437
1438 list_for_each_safe(pos, n, &info->modelist) {
1439 modelist = list_entry(pos, struct fb_modelist, list);
1440 m = &modelist->mode;
1441 fb_videomode_to_var(&var, m);
1442 var.activate = FB_ACTIVATE_TEST;
1443 err = fb_set_var(info, &var);
1444 fb_var_to_videomode(&mode, &var);
1445 if (err || !fb_mode_is_equal(m, &mode)) {
1446 list_del(pos);
1447 kfree(pos);
1448 }
1449 }
1450
1451 err = 1;
1452
1453 if (!list_empty(&info->modelist)) {
1454 event.info = info;
1455 err = notifier_call_chain(&fb_notifier_list,
1456 FB_EVENT_NEW_MODELIST,
1457 &event);
1458 }
1459
1460 return err;
1461}
1462
a812c94b
AD		 1463/**
1464 * fb_con_duit - user<->fbcon passthrough
1465 * @info: struct fb_info
1466 * @event: notification event to be passed to fbcon
1467 * @data: private data
1468 *
1469 * DESCRIPTION
1470 * This function is an fbcon-user event passing channel
1471 * which bypasses fbdev. This is hopefully temporary
1472 * until a user interface for fbcon is created
1473 */
1474int fb_con_duit(struct fb_info *info, int event, void *data)
1475{
1476 struct fb_event evnt;
1477
1478 evnt.info = info;
1479 evnt.data = data;
1480
1481 return notifier_call_chain(&fb_notifier_list, event, &evnt);
1482}
1483EXPORT_SYMBOL(fb_con_duit);
1484
1da177e4
LT		 1485static char *video_options[FB_MAX];
1486static int ofonly;
1487
4dc3b16b
PP		 1488extern const char *global_mode_option;
1489
1da177e4
LT		 1490/**
1491 * fb_get_options - get kernel boot parameters
1492 * @name: framebuffer name as it would appear in
1493 * the boot parameter line
1494 * (video=<name>:<options>)
1495 * @option: the option will be stored here
1496 *
1497 * NOTE: Needed to maintain backwards compatibility
1498 */
1499int fb_get_options(char *name, char **option)
1500{
1501 char *opt, *options = NULL;
1502 int opt_len, retval = 0;
1503 int name_len = strlen(name), i;
1504
1505 if (name_len && ofonly && strncmp(name, "offb", 4))
1506 retval = 1;
1507
1508 if (name_len && !retval) {
1509 for (i = 0; i < FB_MAX; i++) {
1510 if (video_options[i] == NULL)
1511 continue;
1512 opt_len = strlen(video_options[i]);
1513 if (!opt_len)
1514 continue;
1515 opt = video_options[i];
1516 if (!strncmp(name, opt, name_len) &&
1517 opt[name_len] == ':')
1518 options = opt + name_len + 1;
1519 }
1520 }
1521 if (options && !strncmp(options, "off", 3))
1522 retval = 1;
1523
1524 if (option)
1525 *option = options;
1526
1527 return retval;
1528}
1529
1da177e4
LT		 1530/**
1531 * video_setup - process command line options
1532 * @options: string of options
1533 *
1534 * Process command line options for frame buffer subsystem.
1535 *
1536 * NOTE: This function is a __setup and __init function.
1537 * It only stores the options. Drivers have to call
1538 * fb_get_options() as necessary.
1539 *
1540 * Returns zero.
1541 *
1542 */
75c96f85 1543static int __init video_setup(char *options)
1da177e4
LT		 1544{
1545 int i, global = 0;
1546
1547 if (!options || !*options)
1548 global = 1;
1549
1550 if (!global && !strncmp(options, "ofonly", 6)) {
1551 ofonly = 1;
1552 global = 1;
1553 }
1554
1555 if (!global && !strstr(options, "fb:")) {
1556 global_mode_option = options;
1557 global = 1;
1558 }
1559
1560 if (!global) {
1561 for (i = 0; i < FB_MAX; i++) {
1562 if (video_options[i] == NULL) {
1563 video_options[i] = options;
1564 break;
1565 }
1566
1567 }
1568 }
1569
1570 return 0;
1571}
1572__setup("video=", video_setup);
1573
1574 /*
1575 * Visible symbols for modules
1576 */
1577
1578EXPORT_SYMBOL(register_framebuffer);
1579EXPORT_SYMBOL(unregister_framebuffer);
1580EXPORT_SYMBOL(num_registered_fb);
1581EXPORT_SYMBOL(registered_fb);
1582EXPORT_SYMBOL(fb_prepare_logo);
1583EXPORT_SYMBOL(fb_show_logo);
1584EXPORT_SYMBOL(fb_set_var);
1585EXPORT_SYMBOL(fb_blank);
1586EXPORT_SYMBOL(fb_pan_display);
1587EXPORT_SYMBOL(fb_get_buffer_offset);
1da177e4
LT		 1588EXPORT_SYMBOL(fb_set_suspend);
1589EXPORT_SYMBOL(fb_register_client);
1590EXPORT_SYMBOL(fb_unregister_client);
1591EXPORT_SYMBOL(fb_get_options);
1592EXPORT_SYMBOL(fb_new_modelist);
1593
1594MODULE_LICENSE("GPL");
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