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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);
455
9c44e5f6
AD		 456 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
457 yres = info->var.yres;
458 else
459 yres = info->var.xres;
460
461 if (fb_logo.logo && fb_logo.logo->height > yres) {
1da177e4
LT		 462 fb_logo.logo = NULL;
463 return 0;
464 }
9c44e5f6 465
1da177e4
LT		 466 /* What depth we asked for might be different from what we get */
467 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
468 fb_logo.depth = 8;
469 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
470 fb_logo.depth = 4;
471 else
472 fb_logo.depth = 1;
473 return fb_logo.logo->height;
474}
475
9c44e5f6 476int fb_show_logo(struct fb_info *info, int rotate)
1da177e4
LT		 477{
478 u32 *palette = NULL, *saved_pseudo_palette = NULL;
9c44e5f6 479 unsigned char *logo_new = NULL, *logo_rotate = NULL;
1da177e4 480 struct fb_image image;
1da177e4
LT		 481
482 /* Return if the frame buffer is not mapped or suspended */
483 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
484 return 0;
485
486 image.depth = 8;
487 image.data = fb_logo.logo->data;
488
489 if (fb_logo.needs_cmapreset)
490 fb_set_logocmap(info, fb_logo.logo);
491
492 if (fb_logo.needs_truepalette ||
493 fb_logo.needs_directpalette) {
494 palette = kmalloc(256 * 4, GFP_KERNEL);
495 if (palette == NULL)
496 return 0;
497
498 if (fb_logo.needs_truepalette)
499 fb_set_logo_truepalette(info, fb_logo.logo, palette);
500 else
501 fb_set_logo_directpalette(info, fb_logo.logo, palette);
502
503 saved_pseudo_palette = info->pseudo_palette;
504 info->pseudo_palette = palette;
505 }
506
507 if (fb_logo.depth <= 4) {
508 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
509 GFP_KERNEL);
510 if (logo_new == NULL) {
511 kfree(palette);
512 if (saved_pseudo_palette)
513 info->pseudo_palette = saved_pseudo_palette;
514 return 0;
515 }
516 image.data = logo_new;
517 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
518 }
519
9c44e5f6
AD		 520 image.dx = 0;
521 image.dy = 0;
1da177e4
LT		 522 image.width = fb_logo.logo->width;
523 image.height = fb_logo.logo->height;
1da177e4 524
9c44e5f6
AD		 525 if (rotate) {
526 logo_rotate = kmalloc(fb_logo.logo->width *
527 fb_logo.logo->height, GFP_KERNEL);
528 if (logo_rotate)
529 fb_rotate_logo(info, logo_rotate, &image, rotate);
1da177e4 530 }
9c44e5f6
AD		 531
532 fb_do_show_logo(info, &image, rotate);
533
1da177e4
LT		 534 kfree(palette);
535 if (saved_pseudo_palette != NULL)
536 info->pseudo_palette = saved_pseudo_palette;
537 kfree(logo_new);
9c44e5f6 538 kfree(logo_rotate);
1da177e4
LT		 539 return fb_logo.logo->height;
540}
541#else
9c44e5f6
AD		 542int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
543int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
1da177e4
LT		 544#endif /* CONFIG_LOGO */
545
546static int fbmem_read_proc(char *buf, char **start, off_t offset,
547 int len, int *eof, void *private)
548{
549 struct fb_info **fi;
550 int clen;
551
552 clen = 0;
553 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
554 if (*fi)
555 clen += sprintf(buf + clen, "%d %s\n",
556 (*fi)->node,
557 (*fi)->fix.id);
558 *start = buf + offset;
559 if (clen > offset)
560 clen -= offset;
561 else
562 clen = 0;
563 return clen < len ? clen : len;
564}
565
566static ssize_t
567fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
568{
569 unsigned long p = *ppos;
570 struct inode *inode = file->f_dentry->d_inode;
571 int fbidx = iminor(inode);
572 struct fb_info *info = registered_fb[fbidx];
573 u32 *buffer, *dst;
574 u32 __iomem *src;
575 int c, i, cnt = 0, err = 0;
576 unsigned long total_size;
577
578 if (!info || ! info->screen_base)
579 return -ENODEV;
580
581 if (info->state != FBINFO_STATE_RUNNING)
582 return -EPERM;
583
584 if (info->fbops->fb_read)
585 return info->fbops->fb_read(file, buf, count, ppos);
586
587 total_size = info->screen_size;
588 if (total_size == 0)
589 total_size = info->fix.smem_len;
590
591 if (p >= total_size)
592 return 0;
593 if (count >= total_size)
594 count = total_size;
595 if (count + p > total_size)
596 count = total_size - p;
597
598 cnt = 0;
599 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
600 GFP_KERNEL);
601 if (!buffer)
602 return -ENOMEM;
603
604 src = (u32 __iomem *) (info->screen_base + p);
605
606 if (info->fbops->fb_sync)
607 info->fbops->fb_sync(info);
608
609 while (count) {
610 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
611 dst = buffer;
612 for (i = c >> 2; i--; )
613 *dst++ = fb_readl(src++);
614 if (c & 3) {
615 u8 *dst8 = (u8 *) dst;
616 u8 __iomem *src8 = (u8 __iomem *) src;
617
618 for (i = c & 3; i--;)
619 *dst8++ = fb_readb(src8++);
620
621 src = (u32 __iomem *) src8;
622 }
623
624 if (copy_to_user(buf, buffer, c)) {
625 err = -EFAULT;
626 break;
627 }
628 *ppos += c;
629 buf += c;
630 cnt += c;
631 count -= c;
632 }
633
634 kfree(buffer);
635 return (err) ? err : cnt;
636}
637
638static ssize_t
639fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
640{
641 unsigned long p = *ppos;
642 struct inode *inode = file->f_dentry->d_inode;
643 int fbidx = iminor(inode);
644 struct fb_info *info = registered_fb[fbidx];
645 u32 *buffer, *src;
646 u32 __iomem *dst;
647 int c, i, cnt = 0, err;
648 unsigned long total_size;
649
650 if (!info || !info->screen_base)
651 return -ENODEV;
652
653 if (info->state != FBINFO_STATE_RUNNING)
654 return -EPERM;
655
656 if (info->fbops->fb_write)
657 return info->fbops->fb_write(file, buf, count, ppos);
658
659 total_size = info->screen_size;
660 if (total_size == 0)
661 total_size = info->fix.smem_len;
662
663 if (p > total_size)
664 return -ENOSPC;
665 if (count >= total_size)
666 count = total_size;
667 err = 0;
668 if (count + p > total_size) {
669 count = total_size - p;
670 err = -ENOSPC;
671 }
672 cnt = 0;
673 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
674 GFP_KERNEL);
675 if (!buffer)
676 return -ENOMEM;
677
678 dst = (u32 __iomem *) (info->screen_base + p);
679
680 if (info->fbops->fb_sync)
681 info->fbops->fb_sync(info);
682
683 while (count) {
684 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
685 src = buffer;
686 if (copy_from_user(src, buf, c)) {
687 err = -EFAULT;
688 break;
689 }
690 for (i = c >> 2; i--; )
691 fb_writel(*src++, dst++);
692 if (c & 3) {
693 u8 *src8 = (u8 *) src;
694 u8 __iomem *dst8 = (u8 __iomem *) dst;
695
696 for (i = c & 3; i--; )
697 fb_writeb(*src8++, dst8++);
698
699 dst = (u32 __iomem *) dst8;
700 }
701 *ppos += c;
702 buf += c;
703 cnt += c;
704 count -= c;
705 }
706 kfree(buffer);
707
708 return (err) ? err : cnt;
709}
710
711#ifdef CONFIG_KMOD
712static void try_to_load(int fb)
713{
714 request_module("fb%d", fb);
715}
716#endif /* CONFIG_KMOD */
717
718int
719fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
720{
721 int xoffset = var->xoffset;
722 int yoffset = var->yoffset;
723 int err;
724
725 if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
726 xoffset + info->var.xres > info->var.xres_virtual ||
727 yoffset + info->var.yres > info->var.yres_virtual)
728 return -EINVAL;
729 if ((err = info->fbops->fb_pan_display(var, info)))
730 return err;
731 info->var.xoffset = var->xoffset;
732 info->var.yoffset = var->yoffset;
733 if (var->vmode & FB_VMODE_YWRAP)
734 info->var.vmode |= FB_VMODE_YWRAP;
735 else
736 info->var.vmode &= ~FB_VMODE_YWRAP;
737 return 0;
738}
739
740int
741fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
742{
3edea483 743 int err, flags = info->flags;
1da177e4
LT		 744
745 if (var->activate & FB_ACTIVATE_INV_MODE) {
746 struct fb_videomode mode1, mode2;
747 int ret = 0;
748
749 fb_var_to_videomode(&mode1, var);
750 fb_var_to_videomode(&mode2, &info->var);
751 /* make sure we don't delete the videomode of current var */
752 ret = fb_mode_is_equal(&mode1, &mode2);
753
754 if (!ret) {
755 struct fb_event event;
756
757 event.info = info;
758 event.data = &mode1;
759 ret = notifier_call_chain(&fb_notifier_list,
760 FB_EVENT_MODE_DELETE, &event);
761 }
762
763 if (!ret)
764 fb_delete_videomode(&mode1, &info->modelist);
765
766 return ret;
767 }
768
769 if ((var->activate & FB_ACTIVATE_FORCE) ||
770 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
771 if (!info->fbops->fb_check_var) {
772 *var = info->var;
773 return 0;
774 }
775
776 if ((err = info->fbops->fb_check_var(var, info)))
777 return err;
778
779 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
780 struct fb_videomode mode;
781 int err = 0;
782
783 info->var = *var;
784 if (info->fbops->fb_set_par)
785 info->fbops->fb_set_par(info);
786
787 fb_pan_display(info, &info->var);
788
789 fb_set_cmap(&info->cmap, info);
790
791 fb_var_to_videomode(&mode, &info->var);
792
793 if (info->modelist.prev && info->modelist.next &&
794 !list_empty(&info->modelist))
795 err = fb_add_videomode(&mode, &info->modelist);
796
3edea483 797 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
1da177e4 798 struct fb_event event;
7726e9e1
AD		 799 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
800 FB_EVENT_MODE_CHANGE_ALL :
801 FB_EVENT_MODE_CHANGE;
1da177e4
LT		 802
803 info->flags &= ~FBINFO_MISC_USEREVENT;
804 event.info = info;
7726e9e1 805 notifier_call_chain(&fb_notifier_list, evnt,
1da177e4
LT		 806 &event);
807 }
808 }
809 }
810 return 0;
811}
812
813int
814fb_blank(struct fb_info *info, int blank)
815{
816 int ret = -EINVAL;
817
818 if (blank > FB_BLANK_POWERDOWN)
819 blank = FB_BLANK_POWERDOWN;
820
821 if (info->fbops->fb_blank)
822 ret = info->fbops->fb_blank(blank, info);
823
824 if (!ret) {
825 struct fb_event event;
826
827 event.info = info;
828 event.data = &blank;
829 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
830 }
831
832 return ret;
833}
834
835static int
836fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
837 unsigned long arg)
838{
839 int fbidx = iminor(inode);
840 struct fb_info *info = registered_fb[fbidx];
841 struct fb_ops *fb = info->fbops;
842 struct fb_var_screeninfo var;
843 struct fb_fix_screeninfo fix;
844 struct fb_con2fbmap con2fb;
845 struct fb_cmap_user cmap;
846 struct fb_event event;
847 void __user *argp = (void __user *)arg;
848 int i;
849
850 if (!fb)
851 return -ENODEV;
852 switch (cmd) {
853 case FBIOGET_VSCREENINFO:
854 return copy_to_user(argp, &info->var,
855 sizeof(var)) ? -EFAULT : 0;
856 case FBIOPUT_VSCREENINFO:
857 if (copy_from_user(&var, argp, sizeof(var)))
858 return -EFAULT;
859 acquire_console_sem();
860 info->flags |= FBINFO_MISC_USEREVENT;
861 i = fb_set_var(info, &var);
862 info->flags &= ~FBINFO_MISC_USEREVENT;
863 release_console_sem();
864 if (i) return i;
865 if (copy_to_user(argp, &var, sizeof(var)))
866 return -EFAULT;
867 return 0;
868 case FBIOGET_FSCREENINFO:
869 return copy_to_user(argp, &info->fix,
870 sizeof(fix)) ? -EFAULT : 0;
871 case FBIOPUTCMAP:
872 if (copy_from_user(&cmap, argp, sizeof(cmap)))
873 return -EFAULT;
874 return (fb_set_user_cmap(&cmap, info));
875 case FBIOGETCMAP:
876 if (copy_from_user(&cmap, argp, sizeof(cmap)))
877 return -EFAULT;
878 return fb_cmap_to_user(&info->cmap, &cmap);
879 case FBIOPAN_DISPLAY:
880 if (copy_from_user(&var, argp, sizeof(var)))
881 return -EFAULT;
882 acquire_console_sem();
883 i = fb_pan_display(info, &var);
884 release_console_sem();
885 if (i)
886 return i;
887 if (copy_to_user(argp, &var, sizeof(var)))
888 return -EFAULT;
889 return 0;
890 case FBIO_CURSOR:
891 return -EINVAL;
892 case FBIOGET_CON2FBMAP:
893 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
894 return -EFAULT;
895 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
896 return -EINVAL;
897 con2fb.framebuffer = -1;
898 event.info = info;
899 event.data = &con2fb;
900 notifier_call_chain(&fb_notifier_list,
901 FB_EVENT_GET_CONSOLE_MAP, &event);
902 return copy_to_user(argp, &con2fb,
903 sizeof(con2fb)) ? -EFAULT : 0;
904 case FBIOPUT_CON2FBMAP:
905 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
906 return - EFAULT;
907 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
908 return -EINVAL;
909 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
910 return -EINVAL;
911#ifdef CONFIG_KMOD
912 if (!registered_fb[con2fb.framebuffer])
913 try_to_load(con2fb.framebuffer);
914#endif /* CONFIG_KMOD */
915 if (!registered_fb[con2fb.framebuffer])
916 return -EINVAL;
917 event.info = info;
918 event.data = &con2fb;
919 return notifier_call_chain(&fb_notifier_list,
920 FB_EVENT_SET_CONSOLE_MAP,
921 &event);
922 case FBIOBLANK:
923 acquire_console_sem();
924 info->flags |= FBINFO_MISC_USEREVENT;
925 i = fb_blank(info, arg);
926 info->flags &= ~FBINFO_MISC_USEREVENT;
927 release_console_sem();
928 return i;
929 default:
930 if (fb->fb_ioctl == NULL)
931 return -EINVAL;
932 return fb->fb_ioctl(inode, file, cmd, arg, info);
933 }
934}
935
936#ifdef CONFIG_COMPAT
c7f82d9c
AB		 937struct fb_fix_screeninfo32 {
938 char id[16];
939 compat_caddr_t smem_start;
940 u32 smem_len;
941 u32 type;
942 u32 type_aux;
943 u32 visual;
944 u16 xpanstep;
945 u16 ypanstep;
946 u16 ywrapstep;
947 u32 line_length;
948 compat_caddr_t mmio_start;
949 u32 mmio_len;
950 u32 accel;
951 u16 reserved[3];
952};
953
954struct fb_cmap32 {
955 u32 start;
956 u32 len;
957 compat_caddr_t red;
958 compat_caddr_t green;
959 compat_caddr_t blue;
960 compat_caddr_t transp;
961};
962
963static int fb_getput_cmap(struct inode *inode, struct file *file,
964 unsigned int cmd, unsigned long arg)
965{
966 struct fb_cmap_user __user *cmap;
967 struct fb_cmap32 __user *cmap32;
968 __u32 data;
969 int err;
970
971 cmap = compat_alloc_user_space(sizeof(*cmap));
972 cmap32 = compat_ptr(arg);
973
974 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
975 return -EFAULT;
976
977 if (get_user(data, &cmap32->red) ||
978 put_user(compat_ptr(data), &cmap->red) ||
979 get_user(data, &cmap32->green) ||
980 put_user(compat_ptr(data), &cmap->green) ||
981 get_user(data, &cmap32->blue) ||
982 put_user(compat_ptr(data), &cmap->blue) ||
983 get_user(data, &cmap32->transp) ||
984 put_user(compat_ptr(data), &cmap->transp))
985 return -EFAULT;
986
987 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
988
989 if (!err) {
990 if (copy_in_user(&cmap32->start,
991 &cmap->start,
992 2 * sizeof(__u32)))
993 err = -EFAULT;
994 }
995 return err;
996}
997
998static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
999 struct fb_fix_screeninfo32 __user *fix32)
1000{
1001 __u32 data;
1002 int err;
1003
1004 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1005
1006 data = (__u32) (unsigned long) fix->smem_start;
1007 err |= put_user(data, &fix32->smem_start);
1008
1009 err |= put_user(fix->smem_len, &fix32->smem_len);
1010 err |= put_user(fix->type, &fix32->type);
1011 err |= put_user(fix->type_aux, &fix32->type_aux);
1012 err |= put_user(fix->visual, &fix32->visual);
1013 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1014 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1015 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1016 err |= put_user(fix->line_length, &fix32->line_length);
1017
1018 data = (__u32) (unsigned long) fix->mmio_start;
1019 err |= put_user(data, &fix32->mmio_start);
1020
1021 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1022 err |= put_user(fix->accel, &fix32->accel);
1023 err |= copy_to_user(fix32->reserved, fix->reserved,
1024 sizeof(fix->reserved));
1025
1026 return err;
1027}
1028
1029static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1030 unsigned int cmd, unsigned long arg)
1031{
1032 mm_segment_t old_fs;
1033 struct fb_fix_screeninfo fix;
1034 struct fb_fix_screeninfo32 __user *fix32;
1035 int err;
1036
1037 fix32 = compat_ptr(arg);
1038
1039 old_fs = get_fs();
1040 set_fs(KERNEL_DS);
1041 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1042 set_fs(old_fs);
1043
1044 if (!err)
1045 err = do_fscreeninfo_to_user(&fix, fix32);
1046
1047 return err;
1048}
1049
1da177e4
LT		 1050static long
1051fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1052{
c7f82d9c
AB		 1053 struct inode *inode = file->f_dentry->d_inode;
1054 int fbidx = iminor(inode);
1da177e4
LT		 1055 struct fb_info *info = registered_fb[fbidx];
1056 struct fb_ops *fb = info->fbops;
c7f82d9c 1057 long ret = -ENOIOCTLCMD;
1da177e4 1058
1da177e4 1059 lock_kernel();
c7f82d9c
AB		 1060 switch(cmd) {
1061 case FBIOGET_VSCREENINFO:
1062 case FBIOPUT_VSCREENINFO:
1063 case FBIOPAN_DISPLAY:
1064 case FBIOGET_CON2FBMAP:
1065 case FBIOPUT_CON2FBMAP:
1066 arg = (unsigned long) compat_ptr(arg);
1067 case FBIOBLANK:
1068 ret = fb_ioctl(inode, file, cmd, arg);
1069 break;
1070
1071 case FBIOGET_FSCREENINFO:
1072 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1073 break;
1074
1075 case FBIOGETCMAP:
1076 case FBIOPUTCMAP:
1077 ret = fb_getput_cmap(inode, file, cmd, arg);
1078 break;
1079
1080 default:
1081 if (fb->fb_compat_ioctl)
1082 ret = fb->fb_compat_ioctl(file, cmd, arg, info);
1083 break;
1084 }
1da177e4
LT		 1085 unlock_kernel();
1086 return ret;
1087}
1088#endif
1089
1090static int
1091fb_mmap(struct file *file, struct vm_area_struct * vma)
1092{
1093 int fbidx = iminor(file->f_dentry->d_inode);
1094 struct fb_info *info = registered_fb[fbidx];
1095 struct fb_ops *fb = info->fbops;
1096 unsigned long off;
1097#if !defined(__sparc__) || defined(__sparc_v9__)
1098 unsigned long start;
1099 u32 len;
1100#endif
1101
1102 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1103 return -EINVAL;
1104 off = vma->vm_pgoff << PAGE_SHIFT;
1105 if (!fb)
1106 return -ENODEV;
1107 if (fb->fb_mmap) {
1108 int res;
1109 lock_kernel();
1110 res = fb->fb_mmap(info, file, vma);
1111 unlock_kernel();
1112 return res;
1113 }
1114
1115#if defined(__sparc__) && !defined(__sparc_v9__)
1116 /* Should never get here, all fb drivers should have their own
1117 mmap routines */
1118 return -EINVAL;
1119#else
1120 /* !sparc32... */
1121 lock_kernel();
1122
1123 /* frame buffer memory */
1124 start = info->fix.smem_start;
1125 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1126 if (off >= len) {
1127 /* memory mapped io */
1128 off -= len;
1129 if (info->var.accel_flags) {
1130 unlock_kernel();
1131 return -EINVAL;
1132 }
1133 start = info->fix.mmio_start;
1134 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1135 }
1136 unlock_kernel();
1137 start &= PAGE_MASK;
1138 if ((vma->vm_end - vma->vm_start + off) > len)
1139 return -EINVAL;
1140 off += start;
1141 vma->vm_pgoff = off >> PAGE_SHIFT;
1142 /* This is an IO map - tell maydump to skip this VMA */
1143 vma->vm_flags |= VM_IO | VM_RESERVED;
1144#if defined(__sparc_v9__)
1145 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1146 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1147 return -EAGAIN;
1148#else
1149#if defined(__mc68000__)
1150#if defined(CONFIG_SUN3)
1151 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1152#elif defined(CONFIG_MMU)
1153 if (CPU_IS_020_OR_030)
1154 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1155 if (CPU_IS_040_OR_060) {
1156 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1157 /* Use no-cache mode, serialized */
1158 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1159 }
1160#endif
1161#elif defined(__powerpc__)
8b150478 1162 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1da177e4
LT		 1163 vma->vm_end - vma->vm_start,
1164 vma->vm_page_prot);
1165#elif defined(__alpha__)
1166 /* Caching is off in the I/O space quadrant by design. */
1167#elif defined(__i386__) || defined(__x86_64__)
1168 if (boot_cpu_data.x86 > 3)
1169 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1170#elif defined(__mips__)
1171 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1172#elif defined(__hppa__)
1173 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1174#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1175 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1176#elif defined(__ia64__)
1177 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1178 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1179 else
1180 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1181#else
1182#warning What do we have to do here??
1183#endif
1184 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1185 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1186 return -EAGAIN;
1187#endif /* !__sparc_v9__ */
1188 return 0;
1189#endif /* !sparc32 */
1190}
1191
1192static int
1193fb_open(struct inode *inode, struct file *file)
1194{
1195 int fbidx = iminor(inode);
1196 struct fb_info *info;
1197 int res = 0;
1198
1199 if (fbidx >= FB_MAX)
1200 return -ENODEV;
1201#ifdef CONFIG_KMOD
1202 if (!(info = registered_fb[fbidx]))
1203 try_to_load(fbidx);
1204#endif /* CONFIG_KMOD */
1205 if (!(info = registered_fb[fbidx]))
1206 return -ENODEV;
1207 if (!try_module_get(info->fbops->owner))
1208 return -ENODEV;
1209 if (info->fbops->fb_open) {
1210 res = info->fbops->fb_open(info,1);
1211 if (res)
1212 module_put(info->fbops->owner);
1213 }
1214 return res;
1215}
1216
1217static int
1218fb_release(struct inode *inode, struct file *file)
1219{
1220 int fbidx = iminor(inode);
1221 struct fb_info *info;
1222
1223 lock_kernel();
1224 info = registered_fb[fbidx];
1225 if (info->fbops->fb_release)
1226 info->fbops->fb_release(info,1);
1227 module_put(info->fbops->owner);
1228 unlock_kernel();
1229 return 0;
1230}
1231
1232static struct file_operations fb_fops = {
1233 .owner = THIS_MODULE,
1234 .read = fb_read,
1235 .write = fb_write,
1236 .ioctl = fb_ioctl,
1237#ifdef CONFIG_COMPAT
1238 .compat_ioctl = fb_compat_ioctl,
1239#endif
1240 .mmap = fb_mmap,
1241 .open = fb_open,
1242 .release = fb_release,
1243#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1244 .get_unmapped_area = get_fb_unmapped_area,
1245#endif
1246};
1247
56b22935 1248static struct class *fb_class;
1da177e4
LT		 1249
1250/**
1251 * register_framebuffer - registers a frame buffer device
1252 * @fb_info: frame buffer info structure
1253 *
1254 * Registers a frame buffer device @fb_info.
1255 *
1256 * Returns negative errno on error, or zero for success.
1257 *
1258 */
1259
1260int
1261register_framebuffer(struct fb_info *fb_info)
1262{
1263 int i;
1264 struct fb_event event;
96fe6a21 1265 struct fb_videomode mode;
1da177e4
LT		 1266
1267 if (num_registered_fb == FB_MAX)
1268 return -ENXIO;
1269 num_registered_fb++;
1270 for (i = 0 ; i < FB_MAX; i++)
1271 if (!registered_fb[i])
1272 break;
1273 fb_info->node = i;
1274
53f46542 1275 fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1da177e4
LT		 1276 fb_info->device, "fb%d", i);
1277 if (IS_ERR(fb_info->class_device)) {
1278 /* Not fatal */
1279 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1280 fb_info->class_device = NULL;
1281 } else
1282 fb_init_class_device(fb_info);
1283
1284 if (fb_info->pixmap.addr == NULL) {
1285 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1286 if (fb_info->pixmap.addr) {
1287 fb_info->pixmap.size = FBPIXMAPSIZE;
1288 fb_info->pixmap.buf_align = 1;
1289 fb_info->pixmap.scan_align = 1;
58a60643 1290 fb_info->pixmap.access_align = 32;
1da177e4
LT		 1291 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1292 }
1293 }
1294 fb_info->pixmap.offset = 0;
1295
96fe6a21 1296 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1da177e4 1297 INIT_LIST_HEAD(&fb_info->modelist);
1da177e4 1298
96fe6a21
AD		 1299 fb_var_to_videomode(&mode, &fb_info->var);
1300 fb_add_videomode(&mode, &fb_info->modelist);
1da177e4
LT		 1301 registered_fb[i] = fb_info;
1302
1303 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1304 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1305 event.info = fb_info;
1306 notifier_call_chain(&fb_notifier_list,
1307 FB_EVENT_FB_REGISTERED, &event);
1308 return 0;
1309}
1310
1311
1312/**
1313 * unregister_framebuffer - releases a frame buffer device
1314 * @fb_info: frame buffer info structure
1315 *
1316 * Unregisters a frame buffer device @fb_info.
1317 *
1318 * Returns negative errno on error, or zero for success.
1319 *
1320 */
1321
1322int
1323unregister_framebuffer(struct fb_info *fb_info)
1324{
1325 int i;
1326
1327 i = fb_info->node;
1328 if (!registered_fb[i])
1329 return -EINVAL;
1330 devfs_remove("fb/%d", i);
1331
1332 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1333 kfree(fb_info->pixmap.addr);
1334 fb_destroy_modelist(&fb_info->modelist);
1335 registered_fb[i]=NULL;
1336 num_registered_fb--;
1337 fb_cleanup_class_device(fb_info);
56b22935 1338 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1da177e4
LT		 1339 return 0;
1340}
1341
1342/**
1343 * fb_register_client - register a client notifier
1344 * @nb: notifier block to callback on events
1345 */
1346int fb_register_client(struct notifier_block *nb)
1347{
1348 return notifier_chain_register(&fb_notifier_list, nb);
1349}
1350
1351/**
1352 * fb_unregister_client - unregister a client notifier
1353 * @nb: notifier block to callback on events
1354 */
1355int fb_unregister_client(struct notifier_block *nb)
1356{
1357 return notifier_chain_unregister(&fb_notifier_list, nb);
1358}
1359
1360/**
1361 * fb_set_suspend - low level driver signals suspend
1362 * @info: framebuffer affected
1363 * @state: 0 = resuming, !=0 = suspending
1364 *
1365 * This is meant to be used by low level drivers to
1366 * signal suspend/resume to the core & clients.
1367 * It must be called with the console semaphore held
1368 */
1369void fb_set_suspend(struct fb_info *info, int state)
1370{
1371 struct fb_event event;
1372
1373 event.info = info;
1374 if (state) {
1375 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1376 info->state = FBINFO_STATE_SUSPENDED;
1377 } else {
1378 info->state = FBINFO_STATE_RUNNING;
1379 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1380 }
1381}
1382
1383/**
1384 * fbmem_init - init frame buffer subsystem
1385 *
1386 * Initialize the frame buffer subsystem.
1387 *
1388 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1389 *
1390 */
1391
1392static int __init
1393fbmem_init(void)
1394{
1395 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1396
1397 devfs_mk_dir("fb");
1398 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1399 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1400
56b22935 1401 fb_class = class_create(THIS_MODULE, "graphics");
1da177e4
LT		 1402 if (IS_ERR(fb_class)) {
1403 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1404 fb_class = NULL;
1405 }
1406 return 0;
1407}
1408
1409#ifdef MODULE
1410module_init(fbmem_init);
1411static void __exit
1412fbmem_exit(void)
1413{
56b22935 1414 class_destroy(fb_class);
5a340cce 1415 unregister_chrdev(FB_MAJOR, "fb");
1da177e4
LT		 1416}
1417
1418module_exit(fbmem_exit);
1419MODULE_LICENSE("GPL");
1420MODULE_DESCRIPTION("Framebuffer base");
1421#else
1422subsys_initcall(fbmem_init);
1423#endif
1424
1425int fb_new_modelist(struct fb_info *info)
1426{
1427 struct fb_event event;
1428 struct fb_var_screeninfo var = info->var;
1429 struct list_head *pos, *n;
1430 struct fb_modelist *modelist;
1431 struct fb_videomode *m, mode;
1432 int err = 1;
1433
1434 list_for_each_safe(pos, n, &info->modelist) {
1435 modelist = list_entry(pos, struct fb_modelist, list);
1436 m = &modelist->mode;
1437 fb_videomode_to_var(&var, m);
1438 var.activate = FB_ACTIVATE_TEST;
1439 err = fb_set_var(info, &var);
1440 fb_var_to_videomode(&mode, &var);
1441 if (err || !fb_mode_is_equal(m, &mode)) {
1442 list_del(pos);
1443 kfree(pos);
1444 }
1445 }
1446
1447 err = 1;
1448
1449 if (!list_empty(&info->modelist)) {
1450 event.info = info;
1451 err = notifier_call_chain(&fb_notifier_list,
1452 FB_EVENT_NEW_MODELIST,
1453 &event);
1454 }
1455
1456 return err;
1457}
1458
a812c94b
AD		 1459/**
1460 * fb_con_duit - user<->fbcon passthrough
1461 * @info: struct fb_info
1462 * @event: notification event to be passed to fbcon
1463 * @data: private data
1464 *
1465 * DESCRIPTION
1466 * This function is an fbcon-user event passing channel
1467 * which bypasses fbdev. This is hopefully temporary
1468 * until a user interface for fbcon is created
1469 */
1470int fb_con_duit(struct fb_info *info, int event, void *data)
1471{
1472 struct fb_event evnt;
1473
1474 evnt.info = info;
1475 evnt.data = data;
1476
1477 return notifier_call_chain(&fb_notifier_list, event, &evnt);
1478}
1479EXPORT_SYMBOL(fb_con_duit);
1480
1da177e4
LT		 1481static char *video_options[FB_MAX];
1482static int ofonly;
1483
4dc3b16b
PP		 1484extern const char *global_mode_option;
1485
1da177e4
LT		 1486/**
1487 * fb_get_options - get kernel boot parameters
1488 * @name: framebuffer name as it would appear in
1489 * the boot parameter line
1490 * (video=<name>:<options>)
1491 * @option: the option will be stored here
1492 *
1493 * NOTE: Needed to maintain backwards compatibility
1494 */
1495int fb_get_options(char *name, char **option)
1496{
1497 char *opt, *options = NULL;
1498 int opt_len, retval = 0;
1499 int name_len = strlen(name), i;
1500
1501 if (name_len && ofonly && strncmp(name, "offb", 4))
1502 retval = 1;
1503
1504 if (name_len && !retval) {
1505 for (i = 0; i < FB_MAX; i++) {
1506 if (video_options[i] == NULL)
1507 continue;
1508 opt_len = strlen(video_options[i]);
1509 if (!opt_len)
1510 continue;
1511 opt = video_options[i];
1512 if (!strncmp(name, opt, name_len) &&
1513 opt[name_len] == ':')
1514 options = opt + name_len + 1;
1515 }
1516 }
1517 if (options && !strncmp(options, "off", 3))
1518 retval = 1;
1519
1520 if (option)
1521 *option = options;
1522
1523 return retval;
1524}
1525
1da177e4
LT		 1526/**
1527 * video_setup - process command line options
1528 * @options: string of options
1529 *
1530 * Process command line options for frame buffer subsystem.
1531 *
1532 * NOTE: This function is a __setup and __init function.
1533 * It only stores the options. Drivers have to call
1534 * fb_get_options() as necessary.
1535 *
1536 * Returns zero.
1537 *
1538 */
75c96f85 1539static int __init video_setup(char *options)
1da177e4
LT		 1540{
1541 int i, global = 0;
1542
1543 if (!options || !*options)
1544 global = 1;
1545
1546 if (!global && !strncmp(options, "ofonly", 6)) {
1547 ofonly = 1;
1548 global = 1;
1549 }
1550
1551 if (!global && !strstr(options, "fb:")) {
1552 global_mode_option = options;
1553 global = 1;
1554 }
1555
1556 if (!global) {
1557 for (i = 0; i < FB_MAX; i++) {
1558 if (video_options[i] == NULL) {
1559 video_options[i] = options;
1560 break;
1561 }
1562
1563 }
1564 }
1565
1566 return 0;
1567}
1568__setup("video=", video_setup);
1569
1570 /*
1571 * Visible symbols for modules
1572 */
1573
1574EXPORT_SYMBOL(register_framebuffer);
1575EXPORT_SYMBOL(unregister_framebuffer);
1576EXPORT_SYMBOL(num_registered_fb);
1577EXPORT_SYMBOL(registered_fb);
1578EXPORT_SYMBOL(fb_prepare_logo);
1579EXPORT_SYMBOL(fb_show_logo);
1580EXPORT_SYMBOL(fb_set_var);
1581EXPORT_SYMBOL(fb_blank);
1582EXPORT_SYMBOL(fb_pan_display);
1583EXPORT_SYMBOL(fb_get_buffer_offset);
1da177e4
LT		 1584EXPORT_SYMBOL(fb_set_suspend);
1585EXPORT_SYMBOL(fb_register_client);
1586EXPORT_SYMBOL(fb_unregister_client);
1587EXPORT_SYMBOL(fb_get_options);
1588EXPORT_SYMBOL(fb_new_modelist);
1589
1590MODULE_LICENSE("GPL");
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