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[PATCH] Notifier chain update: API changes
[mirror_ubuntu-bionic-kernel.git] / drivers / video / fbmem.c
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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
e041c683 58static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
1da177e4
LT		 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;
0a484a3a 592
1da177e4
LT		 593 if (total_size == 0)
594 total_size = info->fix.smem_len;
595
596 if (p >= total_size)
0a484a3a
AD		 597 return 0;
598
1da177e4 599 if (count >= total_size)
0a484a3a
AD		 600 count = total_size;
601
1da177e4
LT		 602 if (count + p > total_size)
603 count = total_size - p;
604
1da177e4
LT		 605 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
606 GFP_KERNEL);
607 if (!buffer)
608 return -ENOMEM;
609
610 src = (u32 __iomem *) (info->screen_base + p);
611
612 if (info->fbops->fb_sync)
613 info->fbops->fb_sync(info);
614
615 while (count) {
616 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
617 dst = buffer;
618 for (i = c >> 2; i--; )
619 *dst++ = fb_readl(src++);
620 if (c & 3) {
621 u8 *dst8 = (u8 *) dst;
622 u8 __iomem *src8 = (u8 __iomem *) src;
623
624 for (i = c & 3; i--;)
625 *dst8++ = fb_readb(src8++);
626
627 src = (u32 __iomem *) src8;
628 }
629
630 if (copy_to_user(buf, buffer, c)) {
631 err = -EFAULT;
632 break;
633 }
634 *ppos += c;
635 buf += c;
636 cnt += c;
637 count -= c;
638 }
639
640 kfree(buffer);
0a484a3a 641
1da177e4
LT		 642 return (err) ? err : cnt;
643}
644
645static ssize_t
646fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
647{
648 unsigned long p = *ppos;
649 struct inode *inode = file->f_dentry->d_inode;
650 int fbidx = iminor(inode);
651 struct fb_info *info = registered_fb[fbidx];
652 u32 *buffer, *src;
653 u32 __iomem *dst;
0a484a3a 654 int c, i, cnt = 0, err = 0;
1da177e4
LT		 655 unsigned long total_size;
656
657 if (!info || !info->screen_base)
658 return -ENODEV;
659
660 if (info->state != FBINFO_STATE_RUNNING)
661 return -EPERM;
662
663 if (info->fbops->fb_write)
664 return info->fbops->fb_write(file, buf, count, ppos);
665
666 total_size = info->screen_size;
0a484a3a 667
1da177e4
LT		 668 if (total_size == 0)
669 total_size = info->fix.smem_len;
670
671 if (p > total_size)
0a484a3a
AD		 672 return 0;
673
1da177e4 674 if (count >= total_size)
0a484a3a
AD		 675 count = total_size;
676
677 if (count + p > total_size)
678 count = total_size - p;
679
1da177e4
LT		 680 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
681 GFP_KERNEL);
682 if (!buffer)
683 return -ENOMEM;
684
685 dst = (u32 __iomem *) (info->screen_base + p);
686
687 if (info->fbops->fb_sync)
688 info->fbops->fb_sync(info);
689
690 while (count) {
691 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
692 src = buffer;
0a484a3a 693
1da177e4
LT		 694 if (copy_from_user(src, buf, c)) {
695 err = -EFAULT;
696 break;
697 }
0a484a3a 698
1da177e4
LT		 699 for (i = c >> 2; i--; )
700 fb_writel(*src++, dst++);
0a484a3a 701
1da177e4
LT		 702 if (c & 3) {
703 u8 *src8 = (u8 *) src;
704 u8 __iomem *dst8 = (u8 __iomem *) dst;
705
706 for (i = c & 3; i--; )
707 fb_writeb(*src8++, dst8++);
708
709 dst = (u32 __iomem *) dst8;
710 }
0a484a3a 711
1da177e4
LT		 712 *ppos += c;
713 buf += c;
714 cnt += c;
715 count -= c;
716 }
0a484a3a 717
1da177e4
LT		 718 kfree(buffer);
719
720 return (err) ? err : cnt;
721}
722
723#ifdef CONFIG_KMOD
724static void try_to_load(int fb)
725{
726 request_module("fb%d", fb);
727}
728#endif /* CONFIG_KMOD */
729
730int
731fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
732{
1207069f 733 struct fb_fix_screeninfo *fix = &info->fix;
1da177e4
LT		 734 int xoffset = var->xoffset;
735 int yoffset = var->yoffset;
1207069f
AD		 736 int err = 0, yres = info->var.yres;
737
738 if (var->yoffset > 0) {
739 if (var->vmode & FB_VMODE_YWRAP) {
740 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
741 err = -EINVAL;
742 else
743 yres = 0;
744 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
745 err = -EINVAL;
746 }
747
748 if (var->xoffset > 0 && (!fix->xpanstep ||
749 (var->xoffset % fix->xpanstep)))
750 err = -EINVAL;
751
752 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
753 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
754 var->xoffset + info->var.xres > info->var.xres_virtual)
755 return -EINVAL;
1da177e4 756
1da177e4
LT		 757 if ((err = info->fbops->fb_pan_display(var, info)))
758 return err;
759 info->var.xoffset = var->xoffset;
760 info->var.yoffset = var->yoffset;
761 if (var->vmode & FB_VMODE_YWRAP)
762 info->var.vmode |= FB_VMODE_YWRAP;
763 else
764 info->var.vmode &= ~FB_VMODE_YWRAP;
765 return 0;
766}
767
768int
769fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
770{
3edea483 771 int err, flags = info->flags;
1da177e4
LT		 772
773 if (var->activate & FB_ACTIVATE_INV_MODE) {
774 struct fb_videomode mode1, mode2;
775 int ret = 0;
776
777 fb_var_to_videomode(&mode1, var);
778 fb_var_to_videomode(&mode2, &info->var);
779 /* make sure we don't delete the videomode of current var */
780 ret = fb_mode_is_equal(&mode1, &mode2);
781
782 if (!ret) {
783 struct fb_event event;
784
785 event.info = info;
786 event.data = &mode1;
e041c683 787 ret = blocking_notifier_call_chain(&fb_notifier_list,
1da177e4
LT		 788 FB_EVENT_MODE_DELETE, &event);
789 }
790
791 if (!ret)
792 fb_delete_videomode(&mode1, &info->modelist);
793
794 return ret;
795 }
796
797 if ((var->activate & FB_ACTIVATE_FORCE) ||
798 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
799 if (!info->fbops->fb_check_var) {
800 *var = info->var;
801 return 0;
802 }
803
804 if ((err = info->fbops->fb_check_var(var, info)))
805 return err;
806
807 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
808 struct fb_videomode mode;
809 int err = 0;
810
811 info->var = *var;
812 if (info->fbops->fb_set_par)
813 info->fbops->fb_set_par(info);
814
815 fb_pan_display(info, &info->var);
816
817 fb_set_cmap(&info->cmap, info);
818
819 fb_var_to_videomode(&mode, &info->var);
820
821 if (info->modelist.prev && info->modelist.next &&
822 !list_empty(&info->modelist))
823 err = fb_add_videomode(&mode, &info->modelist);
824
3edea483 825 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
1da177e4 826 struct fb_event event;
7726e9e1
AD		 827 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
828 FB_EVENT_MODE_CHANGE_ALL :
829 FB_EVENT_MODE_CHANGE;
1da177e4
LT		 830
831 info->flags &= ~FBINFO_MISC_USEREVENT;
832 event.info = info;
e041c683
AS		 833 blocking_notifier_call_chain(&fb_notifier_list,
834 evnt, &event);
1da177e4
LT		 835 }
836 }
837 }
838 return 0;
839}
840
841int
842fb_blank(struct fb_info *info, int blank)
843{
844 int ret = -EINVAL;
845
846 if (blank > FB_BLANK_POWERDOWN)
847 blank = FB_BLANK_POWERDOWN;
848
849 if (info->fbops->fb_blank)
850 ret = info->fbops->fb_blank(blank, info);
851
852 if (!ret) {
853 struct fb_event event;
854
855 event.info = info;
856 event.data = &blank;
e041c683
AS		 857 blocking_notifier_call_chain(&fb_notifier_list,
858 FB_EVENT_BLANK, &event);
1da177e4
LT		 859 }
860
861 return ret;
862}
863
864static int
865fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
866 unsigned long arg)
867{
868 int fbidx = iminor(inode);
869 struct fb_info *info = registered_fb[fbidx];
870 struct fb_ops *fb = info->fbops;
871 struct fb_var_screeninfo var;
872 struct fb_fix_screeninfo fix;
873 struct fb_con2fbmap con2fb;
874 struct fb_cmap_user cmap;
875 struct fb_event event;
876 void __user *argp = (void __user *)arg;
877 int i;
878
879 if (!fb)
880 return -ENODEV;
881 switch (cmd) {
882 case FBIOGET_VSCREENINFO:
883 return copy_to_user(argp, &info->var,
884 sizeof(var)) ? -EFAULT : 0;
885 case FBIOPUT_VSCREENINFO:
886 if (copy_from_user(&var, argp, sizeof(var)))
887 return -EFAULT;
888 acquire_console_sem();
889 info->flags |= FBINFO_MISC_USEREVENT;
890 i = fb_set_var(info, &var);
891 info->flags &= ~FBINFO_MISC_USEREVENT;
892 release_console_sem();
893 if (i) return i;
894 if (copy_to_user(argp, &var, sizeof(var)))
895 return -EFAULT;
896 return 0;
897 case FBIOGET_FSCREENINFO:
898 return copy_to_user(argp, &info->fix,
899 sizeof(fix)) ? -EFAULT : 0;
900 case FBIOPUTCMAP:
901 if (copy_from_user(&cmap, argp, sizeof(cmap)))
902 return -EFAULT;
903 return (fb_set_user_cmap(&cmap, info));
904 case FBIOGETCMAP:
905 if (copy_from_user(&cmap, argp, sizeof(cmap)))
906 return -EFAULT;
907 return fb_cmap_to_user(&info->cmap, &cmap);
908 case FBIOPAN_DISPLAY:
909 if (copy_from_user(&var, argp, sizeof(var)))
910 return -EFAULT;
911 acquire_console_sem();
912 i = fb_pan_display(info, &var);
913 release_console_sem();
914 if (i)
915 return i;
916 if (copy_to_user(argp, &var, sizeof(var)))
917 return -EFAULT;
918 return 0;
919 case FBIO_CURSOR:
920 return -EINVAL;
921 case FBIOGET_CON2FBMAP:
922 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
923 return -EFAULT;
924 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
925 return -EINVAL;
926 con2fb.framebuffer = -1;
927 event.info = info;
928 event.data = &con2fb;
e041c683 929 blocking_notifier_call_chain(&fb_notifier_list,
1da177e4
LT		 930 FB_EVENT_GET_CONSOLE_MAP, &event);
931 return copy_to_user(argp, &con2fb,
932 sizeof(con2fb)) ? -EFAULT : 0;
933 case FBIOPUT_CON2FBMAP:
934 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
935 return - EFAULT;
936 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
937 return -EINVAL;
938 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
939 return -EINVAL;
940#ifdef CONFIG_KMOD
941 if (!registered_fb[con2fb.framebuffer])
942 try_to_load(con2fb.framebuffer);
943#endif /* CONFIG_KMOD */
944 if (!registered_fb[con2fb.framebuffer])
945 return -EINVAL;
946 event.info = info;
947 event.data = &con2fb;
e041c683 948 return blocking_notifier_call_chain(&fb_notifier_list,
1da177e4
LT		 949 FB_EVENT_SET_CONSOLE_MAP,
950 &event);
951 case FBIOBLANK:
952 acquire_console_sem();
953 info->flags |= FBINFO_MISC_USEREVENT;
954 i = fb_blank(info, arg);
955 info->flags &= ~FBINFO_MISC_USEREVENT;
956 release_console_sem();
957 return i;
958 default:
959 if (fb->fb_ioctl == NULL)
960 return -EINVAL;
67a6680d 961 return fb->fb_ioctl(info, cmd, arg);
1da177e4
LT		 962 }
963}
964
965#ifdef CONFIG_COMPAT
c7f82d9c
AB		 966struct fb_fix_screeninfo32 {
967 char id[16];
968 compat_caddr_t smem_start;
969 u32 smem_len;
970 u32 type;
971 u32 type_aux;
972 u32 visual;
973 u16 xpanstep;
974 u16 ypanstep;
975 u16 ywrapstep;
976 u32 line_length;
977 compat_caddr_t mmio_start;
978 u32 mmio_len;
979 u32 accel;
980 u16 reserved[3];
981};
982
983struct fb_cmap32 {
984 u32 start;
985 u32 len;
986 compat_caddr_t red;
987 compat_caddr_t green;
988 compat_caddr_t blue;
989 compat_caddr_t transp;
990};
991
992static int fb_getput_cmap(struct inode *inode, struct file *file,
993 unsigned int cmd, unsigned long arg)
994{
995 struct fb_cmap_user __user *cmap;
996 struct fb_cmap32 __user *cmap32;
997 __u32 data;
998 int err;
999
1000 cmap = compat_alloc_user_space(sizeof(*cmap));
1001 cmap32 = compat_ptr(arg);
1002
1003 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1004 return -EFAULT;
1005
1006 if (get_user(data, &cmap32->red) ||
1007 put_user(compat_ptr(data), &cmap->red) ||
1008 get_user(data, &cmap32->green) ||
1009 put_user(compat_ptr(data), &cmap->green) ||
1010 get_user(data, &cmap32->blue) ||
1011 put_user(compat_ptr(data), &cmap->blue) ||
1012 get_user(data, &cmap32->transp) ||
1013 put_user(compat_ptr(data), &cmap->transp))
1014 return -EFAULT;
1015
1016 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1017
1018 if (!err) {
1019 if (copy_in_user(&cmap32->start,
1020 &cmap->start,
1021 2 * sizeof(__u32)))
1022 err = -EFAULT;
1023 }
1024 return err;
1025}
1026
1027static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1028 struct fb_fix_screeninfo32 __user *fix32)
1029{
1030 __u32 data;
1031 int err;
1032
1033 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1034
1035 data = (__u32) (unsigned long) fix->smem_start;
1036 err |= put_user(data, &fix32->smem_start);
1037
1038 err |= put_user(fix->smem_len, &fix32->smem_len);
1039 err |= put_user(fix->type, &fix32->type);
1040 err |= put_user(fix->type_aux, &fix32->type_aux);
1041 err |= put_user(fix->visual, &fix32->visual);
1042 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1043 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1044 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1045 err |= put_user(fix->line_length, &fix32->line_length);
1046
1047 data = (__u32) (unsigned long) fix->mmio_start;
1048 err |= put_user(data, &fix32->mmio_start);
1049
1050 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1051 err |= put_user(fix->accel, &fix32->accel);
1052 err |= copy_to_user(fix32->reserved, fix->reserved,
1053 sizeof(fix->reserved));
1054
1055 return err;
1056}
1057
1058static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1059 unsigned int cmd, unsigned long arg)
1060{
1061 mm_segment_t old_fs;
1062 struct fb_fix_screeninfo fix;
1063 struct fb_fix_screeninfo32 __user *fix32;
1064 int err;
1065
1066 fix32 = compat_ptr(arg);
1067
1068 old_fs = get_fs();
1069 set_fs(KERNEL_DS);
1070 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1071 set_fs(old_fs);
1072
1073 if (!err)
1074 err = do_fscreeninfo_to_user(&fix, fix32);
1075
1076 return err;
1077}
1078
1da177e4
LT		 1079static long
1080fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1081{
c7f82d9c
AB		 1082 struct inode *inode = file->f_dentry->d_inode;
1083 int fbidx = iminor(inode);
1da177e4
LT		 1084 struct fb_info *info = registered_fb[fbidx];
1085 struct fb_ops *fb = info->fbops;
c7f82d9c 1086 long ret = -ENOIOCTLCMD;
1da177e4 1087
1da177e4 1088 lock_kernel();
c7f82d9c
AB		 1089 switch(cmd) {
1090 case FBIOGET_VSCREENINFO:
1091 case FBIOPUT_VSCREENINFO:
1092 case FBIOPAN_DISPLAY:
1093 case FBIOGET_CON2FBMAP:
1094 case FBIOPUT_CON2FBMAP:
1095 arg = (unsigned long) compat_ptr(arg);
1096 case FBIOBLANK:
1097 ret = fb_ioctl(inode, file, cmd, arg);
1098 break;
1099
1100 case FBIOGET_FSCREENINFO:
1101 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1102 break;
1103
1104 case FBIOGETCMAP:
1105 case FBIOPUTCMAP:
1106 ret = fb_getput_cmap(inode, file, cmd, arg);
1107 break;
1108
1109 default:
1110 if (fb->fb_compat_ioctl)
67a6680d 1111 ret = fb->fb_compat_ioctl(info, cmd, arg);
c7f82d9c
AB		 1112 break;
1113 }
1da177e4
LT		 1114 unlock_kernel();
1115 return ret;
1116}
1117#endif
1118
1119static int
1120fb_mmap(struct file *file, struct vm_area_struct * vma)
1121{
1122 int fbidx = iminor(file->f_dentry->d_inode);
1123 struct fb_info *info = registered_fb[fbidx];
1124 struct fb_ops *fb = info->fbops;
1125 unsigned long off;
1126#if !defined(__sparc__) || defined(__sparc_v9__)
1127 unsigned long start;
1128 u32 len;
1129#endif
1130
1131 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1132 return -EINVAL;
1133 off = vma->vm_pgoff << PAGE_SHIFT;
1134 if (!fb)
1135 return -ENODEV;
1136 if (fb->fb_mmap) {
1137 int res;
1138 lock_kernel();
216d526c 1139 res = fb->fb_mmap(info, vma);
1da177e4
LT		 1140 unlock_kernel();
1141 return res;
1142 }
1143
1144#if defined(__sparc__) && !defined(__sparc_v9__)
1145 /* Should never get here, all fb drivers should have their own
1146 mmap routines */
1147 return -EINVAL;
1148#else
1149 /* !sparc32... */
1150 lock_kernel();
1151
1152 /* frame buffer memory */
1153 start = info->fix.smem_start;
1154 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1155 if (off >= len) {
1156 /* memory mapped io */
1157 off -= len;
1158 if (info->var.accel_flags) {
1159 unlock_kernel();
1160 return -EINVAL;
1161 }
1162 start = info->fix.mmio_start;
1163 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1164 }
1165 unlock_kernel();
1166 start &= PAGE_MASK;
1167 if ((vma->vm_end - vma->vm_start + off) > len)
1168 return -EINVAL;
1169 off += start;
1170 vma->vm_pgoff = off >> PAGE_SHIFT;
1171 /* This is an IO map - tell maydump to skip this VMA */
1172 vma->vm_flags |= VM_IO | VM_RESERVED;
1da177e4
LT		 1173#if defined(__mc68000__)
1174#if defined(CONFIG_SUN3)
1175 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1176#elif defined(CONFIG_MMU)
1177 if (CPU_IS_020_OR_030)
1178 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1179 if (CPU_IS_040_OR_060) {
1180 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1181 /* Use no-cache mode, serialized */
1182 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1183 }
1184#endif
1185#elif defined(__powerpc__)
8b150478 1186 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1da177e4
LT		 1187 vma->vm_end - vma->vm_start,
1188 vma->vm_page_prot);
1189#elif defined(__alpha__)
1190 /* Caching is off in the I/O space quadrant by design. */
1191#elif defined(__i386__) || defined(__x86_64__)
1192 if (boot_cpu_data.x86 > 3)
1193 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
14778d90 1194#elif defined(__mips__) || defined(__sparc_v9__)
1da177e4
LT		 1195 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1196#elif defined(__hppa__)
1197 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1198#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1199 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1200#elif defined(__ia64__)
1201 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1202 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1203 else
1204 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1205#else
1206#warning What do we have to do here??
1207#endif
1208 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1209 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1210 return -EAGAIN;
1da177e4
LT		 1211 return 0;
1212#endif /* !sparc32 */
1213}
1214
1215static int
1216fb_open(struct inode *inode, struct file *file)
1217{
1218 int fbidx = iminor(inode);
1219 struct fb_info *info;
1220 int res = 0;
1221
1222 if (fbidx >= FB_MAX)
1223 return -ENODEV;
1224#ifdef CONFIG_KMOD
1225 if (!(info = registered_fb[fbidx]))
1226 try_to_load(fbidx);
1227#endif /* CONFIG_KMOD */
1228 if (!(info = registered_fb[fbidx]))
1229 return -ENODEV;
1230 if (!try_module_get(info->fbops->owner))
1231 return -ENODEV;
cae8a12f 1232 file->private_data = info;
1da177e4
LT		 1233 if (info->fbops->fb_open) {
1234 res = info->fbops->fb_open(info,1);
1235 if (res)
1236 module_put(info->fbops->owner);
1237 }
1238 return res;
1239}
1240
1241static int
1242fb_release(struct inode *inode, struct file *file)
1243{
cae8a12f 1244 struct fb_info * const info = file->private_data;
1da177e4
LT		 1245
1246 lock_kernel();
1da177e4
LT		 1247 if (info->fbops->fb_release)
1248 info->fbops->fb_release(info,1);
1249 module_put(info->fbops->owner);
1250 unlock_kernel();
1251 return 0;
1252}
1253
1254static struct file_operations fb_fops = {
1255 .owner = THIS_MODULE,
1256 .read = fb_read,
1257 .write = fb_write,
1258 .ioctl = fb_ioctl,
1259#ifdef CONFIG_COMPAT
1260 .compat_ioctl = fb_compat_ioctl,
1261#endif
1262 .mmap = fb_mmap,
1263 .open = fb_open,
1264 .release = fb_release,
1265#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1266 .get_unmapped_area = get_fb_unmapped_area,
1267#endif
1268};
1269
56b22935 1270static struct class *fb_class;
1da177e4
LT		 1271
1272/**
1273 * register_framebuffer - registers a frame buffer device
1274 * @fb_info: frame buffer info structure
1275 *
1276 * Registers a frame buffer device @fb_info.
1277 *
1278 * Returns negative errno on error, or zero for success.
1279 *
1280 */
1281
1282int
1283register_framebuffer(struct fb_info *fb_info)
1284{
1285 int i;
1286 struct fb_event event;
96fe6a21 1287 struct fb_videomode mode;
1da177e4
LT		 1288
1289 if (num_registered_fb == FB_MAX)
1290 return -ENXIO;
1291 num_registered_fb++;
1292 for (i = 0 ; i < FB_MAX; i++)
1293 if (!registered_fb[i])
1294 break;
1295 fb_info->node = i;
1296
53f46542 1297 fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1da177e4
LT		 1298 fb_info->device, "fb%d", i);
1299 if (IS_ERR(fb_info->class_device)) {
1300 /* Not fatal */
1301 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1302 fb_info->class_device = NULL;
1303 } else
1304 fb_init_class_device(fb_info);
1305
1306 if (fb_info->pixmap.addr == NULL) {
1307 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1308 if (fb_info->pixmap.addr) {
1309 fb_info->pixmap.size = FBPIXMAPSIZE;
1310 fb_info->pixmap.buf_align = 1;
1311 fb_info->pixmap.scan_align = 1;
58a60643 1312 fb_info->pixmap.access_align = 32;
1da177e4
LT		 1313 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1314 }
1315 }
1316 fb_info->pixmap.offset = 0;
1317
96fe6a21 1318 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1da177e4 1319 INIT_LIST_HEAD(&fb_info->modelist);
1da177e4 1320
96fe6a21
AD		 1321 fb_var_to_videomode(&mode, &fb_info->var);
1322 fb_add_videomode(&mode, &fb_info->modelist);
1da177e4
LT		 1323 registered_fb[i] = fb_info;
1324
1325 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1326 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1327 event.info = fb_info;
e041c683 1328 blocking_notifier_call_chain(&fb_notifier_list,
1da177e4
LT		 1329 FB_EVENT_FB_REGISTERED, &event);
1330 return 0;
1331}
1332
1333
1334/**
1335 * unregister_framebuffer - releases a frame buffer device
1336 * @fb_info: frame buffer info structure
1337 *
1338 * Unregisters a frame buffer device @fb_info.
1339 *
1340 * Returns negative errno on error, or zero for success.
1341 *
1342 */
1343
1344int
1345unregister_framebuffer(struct fb_info *fb_info)
1346{
1347 int i;
1348
1349 i = fb_info->node;
1350 if (!registered_fb[i])
1351 return -EINVAL;
1352 devfs_remove("fb/%d", i);
1353
1354 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1355 kfree(fb_info->pixmap.addr);
1356 fb_destroy_modelist(&fb_info->modelist);
1357 registered_fb[i]=NULL;
1358 num_registered_fb--;
1359 fb_cleanup_class_device(fb_info);
56b22935 1360 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1da177e4
LT		 1361 return 0;
1362}
1363
1364/**
1365 * fb_register_client - register a client notifier
1366 * @nb: notifier block to callback on events
1367 */
1368int fb_register_client(struct notifier_block *nb)
1369{
e041c683 1370 return blocking_notifier_chain_register(&fb_notifier_list, nb);
1da177e4
LT		 1371}
1372
1373/**
1374 * fb_unregister_client - unregister a client notifier
1375 * @nb: notifier block to callback on events
1376 */
1377int fb_unregister_client(struct notifier_block *nb)
1378{
e041c683 1379 return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
1da177e4
LT		 1380}
1381
1382/**
1383 * fb_set_suspend - low level driver signals suspend
1384 * @info: framebuffer affected
1385 * @state: 0 = resuming, !=0 = suspending
1386 *
1387 * This is meant to be used by low level drivers to
1388 * signal suspend/resume to the core & clients.
1389 * It must be called with the console semaphore held
1390 */
1391void fb_set_suspend(struct fb_info *info, int state)
1392{
1393 struct fb_event event;
1394
1395 event.info = info;
1396 if (state) {
e041c683
AS		 1397 blocking_notifier_call_chain(&fb_notifier_list,
1398 FB_EVENT_SUSPEND, &event);
1da177e4
LT		 1399 info->state = FBINFO_STATE_SUSPENDED;
1400 } else {
1401 info->state = FBINFO_STATE_RUNNING;
e041c683
AS		 1402 blocking_notifier_call_chain(&fb_notifier_list,
1403 FB_EVENT_RESUME, &event);
1da177e4
LT		 1404 }
1405}
1406
1407/**
1408 * fbmem_init - init frame buffer subsystem
1409 *
1410 * Initialize the frame buffer subsystem.
1411 *
1412 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1413 *
1414 */
1415
1416static int __init
1417fbmem_init(void)
1418{
1419 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1420
1421 devfs_mk_dir("fb");
1422 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1423 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1424
56b22935 1425 fb_class = class_create(THIS_MODULE, "graphics");
1da177e4
LT		 1426 if (IS_ERR(fb_class)) {
1427 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1428 fb_class = NULL;
1429 }
1430 return 0;
1431}
1432
1433#ifdef MODULE
1434module_init(fbmem_init);
1435static void __exit
1436fbmem_exit(void)
1437{
56b22935 1438 class_destroy(fb_class);
5a340cce 1439 unregister_chrdev(FB_MAJOR, "fb");
1da177e4
LT		 1440}
1441
1442module_exit(fbmem_exit);
1443MODULE_LICENSE("GPL");
1444MODULE_DESCRIPTION("Framebuffer base");
1445#else
1446subsys_initcall(fbmem_init);
1447#endif
1448
1449int fb_new_modelist(struct fb_info *info)
1450{
1451 struct fb_event event;
1452 struct fb_var_screeninfo var = info->var;
1453 struct list_head *pos, *n;
1454 struct fb_modelist *modelist;
1455 struct fb_videomode *m, mode;
1456 int err = 1;
1457
1458 list_for_each_safe(pos, n, &info->modelist) {
1459 modelist = list_entry(pos, struct fb_modelist, list);
1460 m = &modelist->mode;
1461 fb_videomode_to_var(&var, m);
1462 var.activate = FB_ACTIVATE_TEST;
1463 err = fb_set_var(info, &var);
1464 fb_var_to_videomode(&mode, &var);
1465 if (err || !fb_mode_is_equal(m, &mode)) {
1466 list_del(pos);
1467 kfree(pos);
1468 }
1469 }
1470
1471 err = 1;
1472
1473 if (!list_empty(&info->modelist)) {
1474 event.info = info;
e041c683 1475 err = blocking_notifier_call_chain(&fb_notifier_list,
1da177e4
LT		 1476 FB_EVENT_NEW_MODELIST,
1477 &event);
1478 }
1479
1480 return err;
1481}
1482
a812c94b
AD		 1483/**
1484 * fb_con_duit - user<->fbcon passthrough
1485 * @info: struct fb_info
1486 * @event: notification event to be passed to fbcon
1487 * @data: private data
1488 *
1489 * DESCRIPTION
1490 * This function is an fbcon-user event passing channel
1491 * which bypasses fbdev. This is hopefully temporary
1492 * until a user interface for fbcon is created
1493 */
1494int fb_con_duit(struct fb_info *info, int event, void *data)
1495{
1496 struct fb_event evnt;
1497
1498 evnt.info = info;
1499 evnt.data = data;
1500
e041c683 1501 return blocking_notifier_call_chain(&fb_notifier_list, event, &evnt);
a812c94b
AD		 1502}
1503EXPORT_SYMBOL(fb_con_duit);
1504
1da177e4
LT		 1505static char *video_options[FB_MAX];
1506static int ofonly;
1507
4dc3b16b
PP		 1508extern const char *global_mode_option;
1509
1da177e4
LT		 1510/**
1511 * fb_get_options - get kernel boot parameters
1512 * @name: framebuffer name as it would appear in
1513 * the boot parameter line
1514 * (video=<name>:<options>)
1515 * @option: the option will be stored here
1516 *
1517 * NOTE: Needed to maintain backwards compatibility
1518 */
1519int fb_get_options(char *name, char **option)
1520{
1521 char *opt, *options = NULL;
1522 int opt_len, retval = 0;
1523 int name_len = strlen(name), i;
1524
1525 if (name_len && ofonly && strncmp(name, "offb", 4))
1526 retval = 1;
1527
1528 if (name_len && !retval) {
1529 for (i = 0; i < FB_MAX; i++) {
1530 if (video_options[i] == NULL)
1531 continue;
1532 opt_len = strlen(video_options[i]);
1533 if (!opt_len)
1534 continue;
1535 opt = video_options[i];
1536 if (!strncmp(name, opt, name_len) &&
1537 opt[name_len] == ':')
1538 options = opt + name_len + 1;
1539 }
1540 }
1541 if (options && !strncmp(options, "off", 3))
1542 retval = 1;
1543
1544 if (option)
1545 *option = options;
1546
1547 return retval;
1548}
1549
bc6d7fdf 1550#ifndef MODULE
1da177e4
LT		 1551/**
1552 * video_setup - process command line options
1553 * @options: string of options
1554 *
1555 * Process command line options for frame buffer subsystem.
1556 *
1557 * NOTE: This function is a __setup and __init function.
1558 * It only stores the options. Drivers have to call
1559 * fb_get_options() as necessary.
1560 *
1561 * Returns zero.
1562 *
1563 */
75c96f85 1564static int __init video_setup(char *options)
1da177e4
LT		 1565{
1566 int i, global = 0;
1567
1568 if (!options || !*options)
1569 global = 1;
1570
1571 if (!global && !strncmp(options, "ofonly", 6)) {
1572 ofonly = 1;
1573 global = 1;
1574 }
1575
1576 if (!global && !strstr(options, "fb:")) {
1577 global_mode_option = options;
1578 global = 1;
1579 }
1580
1581 if (!global) {
1582 for (i = 0; i < FB_MAX; i++) {
1583 if (video_options[i] == NULL) {
1584 video_options[i] = options;
1585 break;
1586 }
1587
1588 }
1589 }
1590
1591 return 0;
1592}
1593__setup("video=", video_setup);
bc6d7fdf 1594#endif
1da177e4
LT		 1595
1596 /*
1597 * Visible symbols for modules
1598 */
1599
1600EXPORT_SYMBOL(register_framebuffer);
1601EXPORT_SYMBOL(unregister_framebuffer);
1602EXPORT_SYMBOL(num_registered_fb);
1603EXPORT_SYMBOL(registered_fb);
1604EXPORT_SYMBOL(fb_prepare_logo);
1605EXPORT_SYMBOL(fb_show_logo);
1606EXPORT_SYMBOL(fb_set_var);
1607EXPORT_SYMBOL(fb_blank);
1608EXPORT_SYMBOL(fb_pan_display);
1609EXPORT_SYMBOL(fb_get_buffer_offset);
1da177e4
LT		 1610EXPORT_SYMBOL(fb_set_suspend);
1611EXPORT_SYMBOL(fb_register_client);
1612EXPORT_SYMBOL(fb_unregister_client);
1613EXPORT_SYMBOL(fb_get_options);
1614EXPORT_SYMBOL(fb_new_modelist);
1615
1616MODULE_LICENSE("GPL");
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