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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-block.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
1da177e4
LT		 14#include <linux/module.h>
15
c7f82d9c 16#include <linux/compat.h>
1da177e4
LT		 17#include <linux/types.h>
18#include <linux/errno.h>
1da177e4
LT		 19#include <linux/smp_lock.h>
20#include <linux/kernel.h>
21#include <linux/major.h>
22#include <linux/slab.h>
23#include <linux/mm.h>
24#include <linux/mman.h>
a8f340e3 25#include <linux/vt.h>
1da177e4
LT		 26#include <linux/init.h>
27#include <linux/linux_logo.h>
28#include <linux/proc_fs.h>
29#include <linux/console.h>
30#ifdef CONFIG_KMOD
31#include <linux/kmod.h>
32#endif
1da177e4 33#include <linux/err.h>
1da177e4
LT		 34#include <linux/device.h>
35#include <linux/efi.h>
36
37#if defined(__mc68000__) || defined(CONFIG_APUS)
38#include <asm/setup.h>
39#endif
40
41#include <asm/io.h>
42#include <asm/uaccess.h>
43#include <asm/page.h>
44#include <asm/pgtable.h>
45
46#include <linux/fb.h>
47
48 /*
49 * Frame buffer device initialization and setup routines
50 */
51
52#define FBPIXMAPSIZE (1024 * 8)
53
0128beee
HD		 54struct fb_info *registered_fb[FB_MAX] __read_mostly;
55int num_registered_fb __read_mostly;
1da177e4
LT		 56
57/*
58 * Helpers
59 */
60
b8c90945
AD		 61int fb_get_color_depth(struct fb_var_screeninfo *var,
62 struct fb_fix_screeninfo *fix)
1da177e4 63{
b8c90945
AD		 64 int depth = 0;
65
66 if (fix->visual == FB_VISUAL_MONO01 ||
67 fix->visual == FB_VISUAL_MONO10)
68 depth = 1;
69 else {
70 if (var->green.length == var->blue.length &&
71 var->green.length == var->red.length &&
72 var->green.offset == var->blue.offset &&
73 var->green.offset == var->red.offset)
74 depth = var->green.length;
75 else
76 depth = var->green.length + var->red.length +
77 var->blue.length;
78 }
79
80 return depth;
1da177e4
LT		 81}
82EXPORT_SYMBOL(fb_get_color_depth);
83
84/*
f5a9951c 85 * Data padding functions.
1da177e4 86 */
f1ab5dac 87void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
1da177e4 88{
829e79b6 89 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
1da177e4 90}
f1ab5dac 91EXPORT_SYMBOL(fb_pad_aligned_buffer);
1da177e4 92
f1ab5dac
JS		 93void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
94 u32 shift_high, u32 shift_low, u32 mod)
1da177e4
LT		 95{
96 u8 mask = (u8) (0xfff << shift_high), tmp;
97 int i, j;
98
99 for (i = height; i--; ) {
100 for (j = 0; j < idx; j++) {
101 tmp = dst[j];
102 tmp &= mask;
103 tmp |= *src >> shift_low;
104 dst[j] = tmp;
105 tmp = *src << shift_high;
106 dst[j+1] = tmp;
107 src++;
108 }
109 tmp = dst[idx];
110 tmp &= mask;
111 tmp |= *src >> shift_low;
112 dst[idx] = tmp;
113 if (shift_high < mod) {
114 tmp = *src << shift_high;
115 dst[idx+1] = tmp;
116 }
117 src++;
118 dst += d_pitch;
119 }
120}
f1ab5dac 121EXPORT_SYMBOL(fb_pad_unaligned_buffer);
1da177e4
LT		 122
123/*
124 * we need to lock this section since fb_cursor
125 * may use fb_imageblit()
126 */
127char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
128{
129 u32 align = buf->buf_align - 1, offset;
130 char *addr = buf->addr;
131
132 /* If IO mapped, we need to sync before access, no sharing of
133 * the pixmap is done
134 */
135 if (buf->flags & FB_PIXMAP_IO) {
136 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
137 info->fbops->fb_sync(info);
138 return addr;
139 }
140
141 /* See if we fit in the remaining pixmap space */
142 offset = buf->offset + align;
143 offset &= ~align;
144 if (offset + size > buf->size) {
145 /* We do not fit. In order to be able to re-use the buffer,
146 * we must ensure no asynchronous DMA'ing or whatever operation
147 * is in progress, we sync for that.
148 */
149 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
150 info->fbops->fb_sync(info);
151 offset = 0;
152 }
153 buf->offset = offset + size;
154 addr += offset;
155
156 return addr;
157}
158
159#ifdef CONFIG_LOGO
1da177e4
LT		 160
161static inline unsigned safe_shift(unsigned d, int n)
162{
163 return n < 0 ? d >> -n : d << n;
164}
165
166static void fb_set_logocmap(struct fb_info *info,
167 const struct linux_logo *logo)
168{
169 struct fb_cmap palette_cmap;
170 u16 palette_green[16];
171 u16 palette_blue[16];
172 u16 palette_red[16];
173 int i, j, n;
174 const unsigned char *clut = logo->clut;
175
176 palette_cmap.start = 0;
177 palette_cmap.len = 16;
178 palette_cmap.red = palette_red;
179 palette_cmap.green = palette_green;
180 palette_cmap.blue = palette_blue;
181 palette_cmap.transp = NULL;
182
183 for (i = 0; i < logo->clutsize; i += n) {
184 n = logo->clutsize - i;
185 /* palette_cmap provides space for only 16 colors at once */
186 if (n > 16)
187 n = 16;
188 palette_cmap.start = 32 + i;
189 palette_cmap.len = n;
190 for (j = 0; j < n; ++j) {
191 palette_cmap.red[j] = clut[0] << 8 | clut[0];
192 palette_cmap.green[j] = clut[1] << 8 | clut[1];
193 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
194 clut += 3;
195 }
196 fb_set_cmap(&palette_cmap, info);
197 }
198}
199
200static void fb_set_logo_truepalette(struct fb_info *info,
201 const struct linux_logo *logo,
202 u32 *palette)
203{
0128beee 204 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
1da177e4
LT		 205 unsigned char redmask, greenmask, bluemask;
206 int redshift, greenshift, blueshift;
207 int i;
208 const unsigned char *clut = logo->clut;
209
210 /*
211 * We have to create a temporary palette since console palette is only
212 * 16 colors long.
213 */
214 /* Bug: Doesn't obey msb_right ... (who needs that?) */
215 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
216 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
217 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
218 redshift = info->var.red.offset - (8 - info->var.red.length);
219 greenshift = info->var.green.offset - (8 - info->var.green.length);
220 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
221
222 for ( i = 0; i < logo->clutsize; i++) {
223 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
224 safe_shift((clut[1] & greenmask), greenshift) |
225 safe_shift((clut[2] & bluemask), blueshift));
226 clut += 3;
227 }
228}
229
230static void fb_set_logo_directpalette(struct fb_info *info,
231 const struct linux_logo *logo,
232 u32 *palette)
233{
234 int redshift, greenshift, blueshift;
235 int i;
236
237 redshift = info->var.red.offset;
238 greenshift = info->var.green.offset;
239 blueshift = info->var.blue.offset;
240
241 for (i = 32; i < logo->clutsize; i++)
242 palette[i] = i << redshift | i << greenshift | i << blueshift;
243}
244
245static void fb_set_logo(struct fb_info *info,
246 const struct linux_logo *logo, u8 *dst,
247 int depth)
248{
b8c90945 249 int i, j, k;
1da177e4 250 const u8 *src = logo->data;
b8c90945
AD		 251 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
252 u8 fg = 1, d;
1da177e4 253
b8c90945 254 if (fb_get_color_depth(&info->var, &info->fix) == 3)
1da177e4
LT		 255 fg = 7;
256
b8c90945
AD		 257 if (info->fix.visual == FB_VISUAL_MONO01 ||
258 info->fix.visual == FB_VISUAL_MONO10)
259 fg = ~((u8) (0xfff << info->var.green.length));
260
1da177e4
LT		 261 switch (depth) {
262 case 4:
263 for (i = 0; i < logo->height; i++)
264 for (j = 0; j < logo->width; src++) {
265 *dst++ = *src >> 4;
266 j++;
267 if (j < logo->width) {
268 *dst++ = *src & 0x0f;
269 j++;
270 }
271 }
272 break;
273 case 1:
274 for (i = 0; i < logo->height; i++) {
275 for (j = 0; j < logo->width; src++) {
276 d = *src ^ xor;
277 for (k = 7; k >= 0; k--) {
278 *dst++ = ((d >> k) & 1) ? fg : 0;
279 j++;
280 }
281 }
282 }
283 break;
284 }
285}
286
287/*
288 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
289 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
290 * the visual format and color depth of the framebuffer, the DAC, the
291 * pseudo_palette, and the logo data will be adjusted accordingly.
292 *
293 * Case 1 - linux_logo_clut224:
294 * Color exceeds the number of console colors (16), thus we set the hardware DAC
295 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
296 *
297 * For visuals that require color info from the pseudo_palette, we also construct
298 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
299 * will be set.
300 *
301 * Case 2 - linux_logo_vga16:
302 * The number of colors just matches the console colors, thus there is no need
303 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
304 * each byte contains color information for two pixels (upper and lower nibble).
305 * To be consistent with fb_imageblit() usage, we therefore separate the two
306 * nibbles into separate bytes. The "depth" flag will be set to 4.
307 *
308 * Case 3 - linux_logo_mono:
309 * This is similar with Case 2. Each byte contains information for 8 pixels.
310 * We isolate each bit and expand each into a byte. The "depth" flag will
311 * be set to 1.
312 */
313static struct logo_data {
314 int depth;
315 int needs_directpalette;
316 int needs_truepalette;
317 int needs_cmapreset;
318 const struct linux_logo *logo;
0128beee 319} fb_logo __read_mostly;
1da177e4 320
9c44e5f6
AD		 321static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
322{
323 u32 size = width * height, i;
324
325 out += size - 1;
326
327 for (i = size; i--; )
328 *out-- = *in++;
329}
330
331static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
332{
f837e6f7 333 int i, j, h = height - 1;
9c44e5f6
AD		 334
335 for (i = 0; i < height; i++)
336 for (j = 0; j < width; j++)
f837e6f7 337 out[height * j + h - i] = *in++;
9c44e5f6
AD		 338}
339
340static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
341{
342 int i, j, w = width - 1;
343
344 for (i = 0; i < height; i++)
345 for (j = 0; j < width; j++)
346 out[height * (w - j) + i] = *in++;
347}
348
349static void fb_rotate_logo(struct fb_info *info, u8 *dst,
350 struct fb_image *image, int rotate)
351{
352 u32 tmp;
353
354 if (rotate == FB_ROTATE_UD) {
9c44e5f6
AD		 355 fb_rotate_logo_ud(image->data, dst, image->width,
356 image->height);
abed5d15
GU		 357 image->dx = info->var.xres - image->width - image->dx;
358 image->dy = info->var.yres - image->height - image->dy;
9c44e5f6 359 } else if (rotate == FB_ROTATE_CW) {
9c44e5f6
AD		 360 fb_rotate_logo_cw(image->data, dst, image->width,
361 image->height);
9c44e5f6
AD		 362 tmp = image->width;
363 image->width = image->height;
364 image->height = tmp;
abed5d15
GU		 365 tmp = image->dy;
366 image->dy = image->dx;
367 image->dx = info->var.xres - image->width - tmp;
f837e6f7 368 } else if (rotate == FB_ROTATE_CCW) {
9c44e5f6
AD		 369 fb_rotate_logo_ccw(image->data, dst, image->width,
370 image->height);
f837e6f7
AD		 371 tmp = image->width;
372 image->width = image->height;
373 image->height = tmp;
abed5d15
GU		 374 tmp = image->dx;
375 image->dx = image->dy;
376 image->dy = info->var.yres - image->height - tmp;
9c44e5f6
AD		 377 }
378
379 image->data = dst;
380}
381
382static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
448d4797 383 int rotate, unsigned int num)
9c44e5f6 384{
448d4797 385 unsigned int x;
9c44e5f6
AD		 386
387 if (rotate == FB_ROTATE_UR) {
448d4797
GU		 388 for (x = 0;
389 x < num && image->dx + image->width <= info->var.xres;
390 x++) {
9c44e5f6 391 info->fbops->fb_imageblit(info, image);
448d4797 392 image->dx += image->width + 8;
9c44e5f6
AD		 393 }
394 } else if (rotate == FB_ROTATE_UD) {
448d4797 395 for (x = 0; x < num && image->dx >= 0; x++) {
9c44e5f6 396 info->fbops->fb_imageblit(info, image);
448d4797 397 image->dx -= image->width + 8;
9c44e5f6
AD		 398 }
399 } else if (rotate == FB_ROTATE_CW) {
448d4797
GU		 400 for (x = 0;
401 x < num && image->dy + image->height <= info->var.yres;
402 x++) {
9c44e5f6 403 info->fbops->fb_imageblit(info, image);
448d4797 404 image->dy += image->height + 8;
9c44e5f6
AD		 405 }
406 } else if (rotate == FB_ROTATE_CCW) {
448d4797 407 for (x = 0; x < num && image->dy >= 0; x++) {
9c44e5f6 408 info->fbops->fb_imageblit(info, image);
448d4797 409 image->dy -= image->height + 8;
9c44e5f6
AD		 410 }
411 }
412}
413
414int fb_prepare_logo(struct fb_info *info, int rotate)
1da177e4 415{
b8c90945 416 int depth = fb_get_color_depth(&info->var, &info->fix);
9c44e5f6 417 int yres;
1da177e4
LT		 418
419 memset(&fb_logo, 0, sizeof(struct logo_data));
420
70802c60
AD		 421 if (info->flags & FBINFO_MISC_TILEBLITTING ||
422 info->flags & FBINFO_MODULE)
1da177e4
LT		 423 return 0;
424
425 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
426 depth = info->var.blue.length;
427 if (info->var.red.length < depth)
428 depth = info->var.red.length;
429 if (info->var.green.length < depth)
430 depth = info->var.green.length;
431 }
432
0c683dbf 433 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
397eeab3
AD		 434 /* assume console colormap */
435 depth = 4;
436 }
437
1da177e4
LT		 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 */
70802c60
AD		 487 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING ||
488 info->flags & FBINFO_MODULE)
1da177e4
LT		 489 return 0;
490
491 image.depth = 8;
492 image.data = fb_logo.logo->data;
493
494 if (fb_logo.needs_cmapreset)
495 fb_set_logocmap(info, fb_logo.logo);
496
497 if (fb_logo.needs_truepalette ||
498 fb_logo.needs_directpalette) {
499 palette = kmalloc(256 * 4, GFP_KERNEL);
500 if (palette == NULL)
501 return 0;
502
503 if (fb_logo.needs_truepalette)
504 fb_set_logo_truepalette(info, fb_logo.logo, palette);
505 else
506 fb_set_logo_directpalette(info, fb_logo.logo, palette);
507
508 saved_pseudo_palette = info->pseudo_palette;
509 info->pseudo_palette = palette;
510 }
511
512 if (fb_logo.depth <= 4) {
513 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
514 GFP_KERNEL);
515 if (logo_new == NULL) {
516 kfree(palette);
517 if (saved_pseudo_palette)
518 info->pseudo_palette = saved_pseudo_palette;
519 return 0;
520 }
521 image.data = logo_new;
522 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
523 }
524
9c44e5f6
AD		 525 image.dx = 0;
526 image.dy = 0;
1da177e4
LT		 527 image.width = fb_logo.logo->width;
528 image.height = fb_logo.logo->height;
1da177e4 529
9c44e5f6
AD		 530 if (rotate) {
531 logo_rotate = kmalloc(fb_logo.logo->width *
532 fb_logo.logo->height, GFP_KERNEL);
533 if (logo_rotate)
534 fb_rotate_logo(info, logo_rotate, &image, rotate);
1da177e4 535 }
9c44e5f6 536
448d4797 537 fb_do_show_logo(info, &image, rotate, num_online_cpus());
9c44e5f6 538
1da177e4
LT		 539 kfree(palette);
540 if (saved_pseudo_palette != NULL)
541 info->pseudo_palette = saved_pseudo_palette;
542 kfree(logo_new);
9c44e5f6 543 kfree(logo_rotate);
1da177e4
LT		 544 return fb_logo.logo->height;
545}
546#else
9c44e5f6
AD		 547int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
548int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
1da177e4
LT		 549#endif /* CONFIG_LOGO */
550
551static int fbmem_read_proc(char *buf, char **start, off_t offset,
552 int len, int *eof, void *private)
553{
554 struct fb_info **fi;
555 int clen;
556
557 clen = 0;
a09fd48f
GU		 558 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
559 fi++)
1da177e4
LT		 560 if (*fi)
561 clen += sprintf(buf + clen, "%d %s\n",
562 (*fi)->node,
563 (*fi)->fix.id);
564 *start = buf + offset;
565 if (clen > offset)
566 clen -= offset;
567 else
568 clen = 0;
569 return clen < len ? clen : len;
570}
571
572static ssize_t
573fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
574{
575 unsigned long p = *ppos;
ad9a824e 576 struct inode *inode = file->f_path.dentry->d_inode;
1da177e4
LT		 577 int fbidx = iminor(inode);
578 struct fb_info *info = registered_fb[fbidx];
579 u32 *buffer, *dst;
580 u32 __iomem *src;
581 int c, i, cnt = 0, err = 0;
582 unsigned long total_size;
583
584 if (!info || ! info->screen_base)
585 return -ENODEV;
586
587 if (info->state != FBINFO_STATE_RUNNING)
588 return -EPERM;
589
590 if (info->fbops->fb_read)
3f9b0880 591 return info->fbops->fb_read(info, buf, count, ppos);
1da177e4
LT		 592
593 total_size = info->screen_size;
0a484a3a 594
1da177e4
LT		 595 if (total_size == 0)
596 total_size = info->fix.smem_len;
597
598 if (p >= total_size)
0a484a3a
AD		 599 return 0;
600
1da177e4 601 if (count >= total_size)
0a484a3a
AD		 602 count = total_size;
603
1da177e4
LT		 604 if (count + p > total_size)
605 count = total_size - p;
606
1da177e4
LT		 607 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
608 GFP_KERNEL);
609 if (!buffer)
610 return -ENOMEM;
611
612 src = (u32 __iomem *) (info->screen_base + p);
613
614 if (info->fbops->fb_sync)
615 info->fbops->fb_sync(info);
616
617 while (count) {
618 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
619 dst = buffer;
620 for (i = c >> 2; i--; )
621 *dst++ = fb_readl(src++);
622 if (c & 3) {
623 u8 *dst8 = (u8 *) dst;
624 u8 __iomem *src8 = (u8 __iomem *) src;
625
626 for (i = c & 3; i--;)
627 *dst8++ = fb_readb(src8++);
628
629 src = (u32 __iomem *) src8;
630 }
631
632 if (copy_to_user(buf, buffer, c)) {
633 err = -EFAULT;
634 break;
635 }
636 *ppos += c;
637 buf += c;
638 cnt += c;
639 count -= c;
640 }
641
642 kfree(buffer);
0a484a3a 643
1da177e4
LT		 644 return (err) ? err : cnt;
645}
646
647static ssize_t
648fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
649{
650 unsigned long p = *ppos;
ad9a824e 651 struct inode *inode = file->f_path.dentry->d_inode;
1da177e4
LT		 652 int fbidx = iminor(inode);
653 struct fb_info *info = registered_fb[fbidx];
654 u32 *buffer, *src;
655 u32 __iomem *dst;
0a484a3a 656 int c, i, cnt = 0, err = 0;
1da177e4
LT		 657 unsigned long total_size;
658
659 if (!info || !info->screen_base)
660 return -ENODEV;
661
662 if (info->state != FBINFO_STATE_RUNNING)
663 return -EPERM;
664
665 if (info->fbops->fb_write)
3f9b0880 666 return info->fbops->fb_write(info, buf, count, ppos);
1da177e4
LT		 667
668 total_size = info->screen_size;
0a484a3a 669
1da177e4
LT		 670 if (total_size == 0)
671 total_size = info->fix.smem_len;
672
673 if (p > total_size)
6a2a8866 674 return -EFBIG;
0a484a3a 675
6a2a8866
AD		 676 if (count > total_size) {
677 err = -EFBIG;
0a484a3a 678 count = total_size;
6a2a8866
AD		 679 }
680
681 if (count + p > total_size) {
682 if (!err)
683 err = -ENOSPC;
0a484a3a 684
0a484a3a 685 count = total_size - p;
6a2a8866 686 }
0a484a3a 687
1da177e4
LT		 688 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
689 GFP_KERNEL);
690 if (!buffer)
691 return -ENOMEM;
692
693 dst = (u32 __iomem *) (info->screen_base + p);
694
695 if (info->fbops->fb_sync)
696 info->fbops->fb_sync(info);
697
698 while (count) {
699 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
700 src = buffer;
0a484a3a 701
1da177e4
LT		 702 if (copy_from_user(src, buf, c)) {
703 err = -EFAULT;
704 break;
705 }
0a484a3a 706
1da177e4
LT		 707 for (i = c >> 2; i--; )
708 fb_writel(*src++, dst++);
0a484a3a 709
1da177e4
LT		 710 if (c & 3) {
711 u8 *src8 = (u8 *) src;
712 u8 __iomem *dst8 = (u8 __iomem *) dst;
713
714 for (i = c & 3; i--; )
715 fb_writeb(*src8++, dst8++);
716
717 dst = (u32 __iomem *) dst8;
718 }
0a484a3a 719
1da177e4
LT		 720 *ppos += c;
721 buf += c;
722 cnt += c;
723 count -= c;
724 }
0a484a3a 725
1da177e4
LT		 726 kfree(buffer);
727
6a2a8866 728 return (cnt) ? cnt : err;
1da177e4
LT		 729}
730
731#ifdef CONFIG_KMOD
732static void try_to_load(int fb)
733{
734 request_module("fb%d", fb);
735}
736#endif /* CONFIG_KMOD */
737
738int
739fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
740{
1207069f 741 struct fb_fix_screeninfo *fix = &info->fix;
1da177e4
LT		 742 int xoffset = var->xoffset;
743 int yoffset = var->yoffset;
1207069f
AD		 744 int err = 0, yres = info->var.yres;
745
746 if (var->yoffset > 0) {
747 if (var->vmode & FB_VMODE_YWRAP) {
748 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
749 err = -EINVAL;
750 else
751 yres = 0;
752 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
753 err = -EINVAL;
754 }
755
756 if (var->xoffset > 0 && (!fix->xpanstep ||
757 (var->xoffset % fix->xpanstep)))
758 err = -EINVAL;
759
760 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
761 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
762 var->xoffset + info->var.xres > info->var.xres_virtual)
763 return -EINVAL;
1da177e4 764
1da177e4
LT		 765 if ((err = info->fbops->fb_pan_display(var, info)))
766 return err;
767 info->var.xoffset = var->xoffset;
768 info->var.yoffset = var->yoffset;
769 if (var->vmode & FB_VMODE_YWRAP)
770 info->var.vmode |= FB_VMODE_YWRAP;
771 else
772 info->var.vmode &= ~FB_VMODE_YWRAP;
773 return 0;
774}
775
38a3dc51
AD		 776static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
777 u32 activate)
778{
779 struct fb_event event;
780 struct fb_blit_caps caps, fbcaps;
781 int err = 0;
782
783 memset(&caps, 0, sizeof(caps));
784 memset(&fbcaps, 0, sizeof(fbcaps));
785 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
786 event.info = info;
787 event.data = &caps;
788 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
789 info->fbops->fb_get_caps(info, &fbcaps, var);
790
791 if (((fbcaps.x ^ caps.x) & caps.x) ||
792 ((fbcaps.y ^ caps.y) & caps.y) ||
793 (fbcaps.len < caps.len))
794 err = -EINVAL;
795
796 return err;
797}
798
1da177e4
LT		 799int
800fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
801{
b1e7223f
AD		 802 int flags = info->flags;
803 int ret = 0;
1da177e4
LT		 804
805 if (var->activate & FB_ACTIVATE_INV_MODE) {
806 struct fb_videomode mode1, mode2;
1da177e4
LT		 807
808 fb_var_to_videomode(&mode1, var);
809 fb_var_to_videomode(&mode2, &info->var);
810 /* make sure we don't delete the videomode of current var */
811 ret = fb_mode_is_equal(&mode1, &mode2);
812
813 if (!ret) {
814 struct fb_event event;
815
816 event.info = info;
817 event.data = &mode1;
256154fb 818 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
1da177e4
LT		 819 }
820
821 if (!ret)
822 fb_delete_videomode(&mode1, &info->modelist);
823
b1e7223f
AD		 824
825 ret = (ret) ? -EINVAL : 0;
826 goto done;
1da177e4
LT		 827 }
828
829 if ((var->activate & FB_ACTIVATE_FORCE) ||
830 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
4941cb7a
AD		 831 u32 activate = var->activate;
832
1da177e4
LT		 833 if (!info->fbops->fb_check_var) {
834 *var = info->var;
b1e7223f 835 goto done;
1da177e4
LT		 836 }
837
b1e7223f
AD		 838 ret = info->fbops->fb_check_var(var, info);
839
840 if (ret)
841 goto done;
1da177e4
LT		 842
843 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
844 struct fb_videomode mode;
1da177e4 845
38a3dc51 846 if (info->fbops->fb_get_caps) {
b1e7223f 847 ret = fb_check_caps(info, var, activate);
38a3dc51 848
b1e7223f 849 if (ret)
38a3dc51
AD		 850 goto done;
851 }
852
1da177e4 853 info->var = *var;
38a3dc51 854
1da177e4
LT		 855 if (info->fbops->fb_set_par)
856 info->fbops->fb_set_par(info);
857
858 fb_pan_display(info, &info->var);
1da177e4 859 fb_set_cmap(&info->cmap, info);
1da177e4
LT		 860 fb_var_to_videomode(&mode, &info->var);
861
862 if (info->modelist.prev && info->modelist.next &&
863 !list_empty(&info->modelist))
b1e7223f 864 ret = fb_add_videomode(&mode, &info->modelist);
1da177e4 865
b1e7223f 866 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1da177e4 867 struct fb_event event;
4941cb7a 868 int evnt = (activate & FB_ACTIVATE_ALL) ?
7726e9e1
AD		 869 FB_EVENT_MODE_CHANGE_ALL :
870 FB_EVENT_MODE_CHANGE;
1da177e4
LT		 871
872 info->flags &= ~FBINFO_MISC_USEREVENT;
873 event.info = info;
256154fb 874 fb_notifier_call_chain(evnt, &event);
1da177e4
LT		 875 }
876 }
877 }
38a3dc51
AD		 878
879 done:
b1e7223f 880 return ret;
1da177e4
LT		 881}
882
883int
884fb_blank(struct fb_info *info, int blank)
885{
886 int ret = -EINVAL;
887
888 if (blank > FB_BLANK_POWERDOWN)
889 blank = FB_BLANK_POWERDOWN;
890
891 if (info->fbops->fb_blank)
892 ret = info->fbops->fb_blank(blank, info);
893
894 if (!ret) {
895 struct fb_event event;
896
897 event.info = info;
898 event.data = &blank;
256154fb 899 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1da177e4
LT		 900 }
901
902 return ret;
903}
904
905static int
906fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
907 unsigned long arg)
908{
909 int fbidx = iminor(inode);
910 struct fb_info *info = registered_fb[fbidx];
911 struct fb_ops *fb = info->fbops;
912 struct fb_var_screeninfo var;
913 struct fb_fix_screeninfo fix;
914 struct fb_con2fbmap con2fb;
915 struct fb_cmap_user cmap;
916 struct fb_event event;
917 void __user *argp = (void __user *)arg;
918 int i;
919
920 if (!fb)
921 return -ENODEV;
922 switch (cmd) {
923 case FBIOGET_VSCREENINFO:
924 return copy_to_user(argp, &info->var,
925 sizeof(var)) ? -EFAULT : 0;
926 case FBIOPUT_VSCREENINFO:
927 if (copy_from_user(&var, argp, sizeof(var)))
928 return -EFAULT;
929 acquire_console_sem();
930 info->flags |= FBINFO_MISC_USEREVENT;
931 i = fb_set_var(info, &var);
932 info->flags &= ~FBINFO_MISC_USEREVENT;
933 release_console_sem();
934 if (i) return i;
935 if (copy_to_user(argp, &var, sizeof(var)))
936 return -EFAULT;
937 return 0;
938 case FBIOGET_FSCREENINFO:
939 return copy_to_user(argp, &info->fix,
940 sizeof(fix)) ? -EFAULT : 0;
941 case FBIOPUTCMAP:
942 if (copy_from_user(&cmap, argp, sizeof(cmap)))
943 return -EFAULT;
944 return (fb_set_user_cmap(&cmap, info));
945 case FBIOGETCMAP:
946 if (copy_from_user(&cmap, argp, sizeof(cmap)))
947 return -EFAULT;
948 return fb_cmap_to_user(&info->cmap, &cmap);
949 case FBIOPAN_DISPLAY:
950 if (copy_from_user(&var, argp, sizeof(var)))
951 return -EFAULT;
952 acquire_console_sem();
953 i = fb_pan_display(info, &var);
954 release_console_sem();
955 if (i)
956 return i;
957 if (copy_to_user(argp, &var, sizeof(var)))
958 return -EFAULT;
959 return 0;
960 case FBIO_CURSOR:
961 return -EINVAL;
962 case FBIOGET_CON2FBMAP:
963 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
964 return -EFAULT;
965 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
966 return -EINVAL;
967 con2fb.framebuffer = -1;
968 event.info = info;
969 event.data = &con2fb;
256154fb 970 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1da177e4
LT		 971 return copy_to_user(argp, &con2fb,
972 sizeof(con2fb)) ? -EFAULT : 0;
973 case FBIOPUT_CON2FBMAP:
974 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
975 return - EFAULT;
976 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
977 return -EINVAL;
978 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
979 return -EINVAL;
980#ifdef CONFIG_KMOD
981 if (!registered_fb[con2fb.framebuffer])
982 try_to_load(con2fb.framebuffer);
983#endif /* CONFIG_KMOD */
984 if (!registered_fb[con2fb.framebuffer])
985 return -EINVAL;
986 event.info = info;
987 event.data = &con2fb;
256154fb
AD		 988 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
989 &event);
1da177e4
LT		 990 case FBIOBLANK:
991 acquire_console_sem();
992 info->flags |= FBINFO_MISC_USEREVENT;
993 i = fb_blank(info, arg);
994 info->flags &= ~FBINFO_MISC_USEREVENT;
995 release_console_sem();
996 return i;
997 default:
998 if (fb->fb_ioctl == NULL)
999 return -EINVAL;
67a6680d 1000 return fb->fb_ioctl(info, cmd, arg);
1da177e4
LT		 1001 }
1002}
1003
1004#ifdef CONFIG_COMPAT
c7f82d9c
AB		 1005struct fb_fix_screeninfo32 {
1006 char id[16];
1007 compat_caddr_t smem_start;
1008 u32 smem_len;
1009 u32 type;
1010 u32 type_aux;
1011 u32 visual;
1012 u16 xpanstep;
1013 u16 ypanstep;
1014 u16 ywrapstep;
1015 u32 line_length;
1016 compat_caddr_t mmio_start;
1017 u32 mmio_len;
1018 u32 accel;
1019 u16 reserved[3];
1020};
1021
1022struct fb_cmap32 {
1023 u32 start;
1024 u32 len;
1025 compat_caddr_t red;
1026 compat_caddr_t green;
1027 compat_caddr_t blue;
1028 compat_caddr_t transp;
1029};
1030
1031static int fb_getput_cmap(struct inode *inode, struct file *file,
1032 unsigned int cmd, unsigned long arg)
1033{
1034 struct fb_cmap_user __user *cmap;
1035 struct fb_cmap32 __user *cmap32;
1036 __u32 data;
1037 int err;
1038
1039 cmap = compat_alloc_user_space(sizeof(*cmap));
1040 cmap32 = compat_ptr(arg);
1041
1042 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1043 return -EFAULT;
1044
1045 if (get_user(data, &cmap32->red) ||
1046 put_user(compat_ptr(data), &cmap->red) ||
1047 get_user(data, &cmap32->green) ||
1048 put_user(compat_ptr(data), &cmap->green) ||
1049 get_user(data, &cmap32->blue) ||
1050 put_user(compat_ptr(data), &cmap->blue) ||
1051 get_user(data, &cmap32->transp) ||
1052 put_user(compat_ptr(data), &cmap->transp))
1053 return -EFAULT;
1054
1055 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1056
1057 if (!err) {
1058 if (copy_in_user(&cmap32->start,
1059 &cmap->start,
1060 2 * sizeof(__u32)))
1061 err = -EFAULT;
1062 }
1063 return err;
1064}
1065
1066static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1067 struct fb_fix_screeninfo32 __user *fix32)
1068{
1069 __u32 data;
1070 int err;
1071
1072 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1073
1074 data = (__u32) (unsigned long) fix->smem_start;
1075 err |= put_user(data, &fix32->smem_start);
1076
1077 err |= put_user(fix->smem_len, &fix32->smem_len);
1078 err |= put_user(fix->type, &fix32->type);
1079 err |= put_user(fix->type_aux, &fix32->type_aux);
1080 err |= put_user(fix->visual, &fix32->visual);
1081 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1082 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1083 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1084 err |= put_user(fix->line_length, &fix32->line_length);
1085
1086 data = (__u32) (unsigned long) fix->mmio_start;
1087 err |= put_user(data, &fix32->mmio_start);
1088
1089 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1090 err |= put_user(fix->accel, &fix32->accel);
1091 err |= copy_to_user(fix32->reserved, fix->reserved,
1092 sizeof(fix->reserved));
1093
1094 return err;
1095}
1096
1097static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1098 unsigned int cmd, unsigned long arg)
1099{
1100 mm_segment_t old_fs;
1101 struct fb_fix_screeninfo fix;
1102 struct fb_fix_screeninfo32 __user *fix32;
1103 int err;
1104
1105 fix32 = compat_ptr(arg);
1106
1107 old_fs = get_fs();
1108 set_fs(KERNEL_DS);
1109 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1110 set_fs(old_fs);
1111
1112 if (!err)
1113 err = do_fscreeninfo_to_user(&fix, fix32);
1114
1115 return err;
1116}
1117
1da177e4
LT		 1118static long
1119fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1120{
ad9a824e 1121 struct inode *inode = file->f_path.dentry->d_inode;
c7f82d9c 1122 int fbidx = iminor(inode);
1da177e4
LT		 1123 struct fb_info *info = registered_fb[fbidx];
1124 struct fb_ops *fb = info->fbops;
c7f82d9c 1125 long ret = -ENOIOCTLCMD;
1da177e4 1126
1da177e4 1127 lock_kernel();
c7f82d9c
AB		 1128 switch(cmd) {
1129 case FBIOGET_VSCREENINFO:
1130 case FBIOPUT_VSCREENINFO:
1131 case FBIOPAN_DISPLAY:
1132 case FBIOGET_CON2FBMAP:
1133 case FBIOPUT_CON2FBMAP:
1134 arg = (unsigned long) compat_ptr(arg);
1135 case FBIOBLANK:
1136 ret = fb_ioctl(inode, file, cmd, arg);
1137 break;
1138
1139 case FBIOGET_FSCREENINFO:
1140 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1141 break;
1142
1143 case FBIOGETCMAP:
1144 case FBIOPUTCMAP:
1145 ret = fb_getput_cmap(inode, file, cmd, arg);
1146 break;
1147
1148 default:
1149 if (fb->fb_compat_ioctl)
67a6680d 1150 ret = fb->fb_compat_ioctl(info, cmd, arg);
c7f82d9c
AB		 1151 break;
1152 }
1da177e4
LT		 1153 unlock_kernel();
1154 return ret;
1155}
1156#endif
1157
1158static int
1159fb_mmap(struct file *file, struct vm_area_struct * vma)
1160{
ad9a824e 1161 int fbidx = iminor(file->f_path.dentry->d_inode);
1da177e4
LT		 1162 struct fb_info *info = registered_fb[fbidx];
1163 struct fb_ops *fb = info->fbops;
1164 unsigned long off;
1165#if !defined(__sparc__) || defined(__sparc_v9__)
1166 unsigned long start;
1167 u32 len;
1168#endif
1169
1170 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1171 return -EINVAL;
1172 off = vma->vm_pgoff << PAGE_SHIFT;
1173 if (!fb)
1174 return -ENODEV;
1175 if (fb->fb_mmap) {
1176 int res;
1177 lock_kernel();
216d526c 1178 res = fb->fb_mmap(info, vma);
1da177e4
LT		 1179 unlock_kernel();
1180 return res;
1181 }
1182
1183#if defined(__sparc__) && !defined(__sparc_v9__)
1184 /* Should never get here, all fb drivers should have their own
1185 mmap routines */
1186 return -EINVAL;
1187#else
1188 /* !sparc32... */
1189 lock_kernel();
1190
1191 /* frame buffer memory */
1192 start = info->fix.smem_start;
1193 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1194 if (off >= len) {
1195 /* memory mapped io */
1196 off -= len;
1197 if (info->var.accel_flags) {
1198 unlock_kernel();
1199 return -EINVAL;
1200 }
1201 start = info->fix.mmio_start;
1202 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1203 }
1204 unlock_kernel();
1205 start &= PAGE_MASK;
1206 if ((vma->vm_end - vma->vm_start + off) > len)
1207 return -EINVAL;
1208 off += start;
1209 vma->vm_pgoff = off >> PAGE_SHIFT;
1210 /* This is an IO map - tell maydump to skip this VMA */
1211 vma->vm_flags |= VM_IO | VM_RESERVED;
1da177e4
LT		 1212#if defined(__mc68000__)
1213#if defined(CONFIG_SUN3)
1214 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1215#elif defined(CONFIG_MMU)
1216 if (CPU_IS_020_OR_030)
1217 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1218 if (CPU_IS_040_OR_060) {
1219 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1220 /* Use no-cache mode, serialized */
1221 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1222 }
1223#endif
1224#elif defined(__powerpc__)
8b150478 1225 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1da177e4
LT		 1226 vma->vm_end - vma->vm_start,
1227 vma->vm_page_prot);
1228#elif defined(__alpha__)
1229 /* Caching is off in the I/O space quadrant by design. */
1230#elif defined(__i386__) || defined(__x86_64__)
1231 if (boot_cpu_data.x86 > 3)
1232 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
14778d90 1233#elif defined(__mips__) || defined(__sparc_v9__)
1da177e4
LT		 1234 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1235#elif defined(__hppa__)
1236 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1237#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1238 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
880169dd
HS		 1239#elif defined(__avr32__)
1240 vma->vm_page_prot = __pgprot((pgprot_val(vma->vm_page_prot)
1241 & ~_PAGE_CACHABLE)
1242 | (_PAGE_BUFFER | _PAGE_DIRTY));
1da177e4
LT		 1243#elif defined(__ia64__)
1244 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1245 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1246 else
1247 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1248#else
1249#warning What do we have to do here??
1250#endif
1251 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1252 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1253 return -EAGAIN;
1da177e4
LT		 1254 return 0;
1255#endif /* !sparc32 */
1256}
1257
1258static int
1259fb_open(struct inode *inode, struct file *file)
1260{
1261 int fbidx = iminor(inode);
1262 struct fb_info *info;
1263 int res = 0;
1264
1265 if (fbidx >= FB_MAX)
1266 return -ENODEV;
1267#ifdef CONFIG_KMOD
1268 if (!(info = registered_fb[fbidx]))
1269 try_to_load(fbidx);
1270#endif /* CONFIG_KMOD */
1271 if (!(info = registered_fb[fbidx]))
1272 return -ENODEV;
1273 if (!try_module_get(info->fbops->owner))
1274 return -ENODEV;
cae8a12f 1275 file->private_data = info;
1da177e4
LT		 1276 if (info->fbops->fb_open) {
1277 res = info->fbops->fb_open(info,1);
1278 if (res)
1279 module_put(info->fbops->owner);
1280 }
1281 return res;
1282}
1283
1284static int
1285fb_release(struct inode *inode, struct file *file)
1286{
cae8a12f 1287 struct fb_info * const info = file->private_data;
1da177e4
LT		 1288
1289 lock_kernel();
1da177e4
LT		 1290 if (info->fbops->fb_release)
1291 info->fbops->fb_release(info,1);
1292 module_put(info->fbops->owner);
1293 unlock_kernel();
1294 return 0;
1295}
1296
0128beee 1297static const struct file_operations fb_fops = {
1da177e4
LT		 1298 .owner = THIS_MODULE,
1299 .read = fb_read,
1300 .write = fb_write,
1301 .ioctl = fb_ioctl,
1302#ifdef CONFIG_COMPAT
1303 .compat_ioctl = fb_compat_ioctl,
1304#endif
1305 .mmap = fb_mmap,
1306 .open = fb_open,
1307 .release = fb_release,
1308#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1309 .get_unmapped_area = get_fb_unmapped_area,
1310#endif
5e841b88
PM		 1311#ifdef CONFIG_FB_DEFERRED_IO
1312 .fsync = fb_deferred_io_fsync,
1313#endif
1da177e4
LT		 1314};
1315
9a179176
AD		 1316struct class *fb_class;
1317EXPORT_SYMBOL(fb_class);
1da177e4
LT		 1318/**
1319 * register_framebuffer - registers a frame buffer device
1320 * @fb_info: frame buffer info structure
1321 *
1322 * Registers a frame buffer device @fb_info.
1323 *
1324 * Returns negative errno on error, or zero for success.
1325 *
1326 */
1327
1328int
1329register_framebuffer(struct fb_info *fb_info)
1330{
1331 int i;
1332 struct fb_event event;
96fe6a21 1333 struct fb_videomode mode;
1da177e4
LT		 1334
1335 if (num_registered_fb == FB_MAX)
1336 return -ENXIO;
1337 num_registered_fb++;
1338 for (i = 0 ; i < FB_MAX; i++)
1339 if (!registered_fb[i])
1340 break;
1341 fb_info->node = i;
1342
78cde088
GKH		 1343 fb_info->dev = device_create(fb_class, fb_info->device,
1344 MKDEV(FB_MAJOR, i), "fb%d", i);
1345 if (IS_ERR(fb_info->dev)) {
1da177e4 1346 /* Not fatal */
78cde088
GKH		 1347 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1348 fb_info->dev = NULL;
1da177e4 1349 } else
78cde088 1350 fb_init_device(fb_info);
1da177e4
LT		 1351
1352 if (fb_info->pixmap.addr == NULL) {
1353 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1354 if (fb_info->pixmap.addr) {
1355 fb_info->pixmap.size = FBPIXMAPSIZE;
1356 fb_info->pixmap.buf_align = 1;
1357 fb_info->pixmap.scan_align = 1;
58a60643 1358 fb_info->pixmap.access_align = 32;
1da177e4
LT		 1359 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1360 }
1361 }
1362 fb_info->pixmap.offset = 0;
1363
bf26ad72
AD		 1364 if (!fb_info->pixmap.blit_x)
1365 fb_info->pixmap.blit_x = ~(u32)0;
1366
1367 if (!fb_info->pixmap.blit_y)
1368 fb_info->pixmap.blit_y = ~(u32)0;
1369
96fe6a21 1370 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1da177e4 1371 INIT_LIST_HEAD(&fb_info->modelist);
1da177e4 1372
96fe6a21
AD		 1373 fb_var_to_videomode(&mode, &fb_info->var);
1374 fb_add_videomode(&mode, &fb_info->modelist);
1da177e4
LT		 1375 registered_fb[i] = fb_info;
1376
1da177e4 1377 event.info = fb_info;
256154fb 1378 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1da177e4
LT		 1379 return 0;
1380}
1381
1382
1383/**
1384 * unregister_framebuffer - releases a frame buffer device
1385 * @fb_info: frame buffer info structure
1386 *
1387 * Unregisters a frame buffer device @fb_info.
1388 *
1389 * Returns negative errno on error, or zero for success.
1390 *
1391 */
1392
1393int
1394unregister_framebuffer(struct fb_info *fb_info)
1395{
e614b18d 1396 struct fb_event event;
1da177e4
LT		 1397 int i;
1398
1399 i = fb_info->node;
1400 if (!registered_fb[i])
1401 return -EINVAL;
1da177e4 1402
e614b18d
AD		 1403 if (fb_info->pixmap.addr &&
1404 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1da177e4
LT		 1405 kfree(fb_info->pixmap.addr);
1406 fb_destroy_modelist(&fb_info->modelist);
1407 registered_fb[i]=NULL;
1408 num_registered_fb--;
78cde088
GKH		 1409 fb_cleanup_device(fb_info);
1410 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
e614b18d 1411 event.info = fb_info;
256154fb 1412 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1da177e4
LT		 1413 return 0;
1414}
1415
1da177e4
LT		 1416/**
1417 * fb_set_suspend - low level driver signals suspend
1418 * @info: framebuffer affected
1419 * @state: 0 = resuming, !=0 = suspending
1420 *
1421 * This is meant to be used by low level drivers to
1422 * signal suspend/resume to the core & clients.
1423 * It must be called with the console semaphore held
1424 */
1425void fb_set_suspend(struct fb_info *info, int state)
1426{
1427 struct fb_event event;
1428
1429 event.info = info;
1430 if (state) {
256154fb 1431 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1da177e4
LT		 1432 info->state = FBINFO_STATE_SUSPENDED;
1433 } else {
1434 info->state = FBINFO_STATE_RUNNING;
256154fb 1435 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1da177e4
LT		 1436 }
1437}
1438
1439/**
1440 * fbmem_init - init frame buffer subsystem
1441 *
1442 * Initialize the frame buffer subsystem.
1443 *
1444 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1445 *
1446 */
1447
1448static int __init
1449fbmem_init(void)
1450{
1451 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1452
1da177e4
LT		 1453 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1454 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1455
56b22935 1456 fb_class = class_create(THIS_MODULE, "graphics");
1da177e4
LT		 1457 if (IS_ERR(fb_class)) {
1458 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1459 fb_class = NULL;
1460 }
1461 return 0;
1462}
1463
1464#ifdef MODULE
1465module_init(fbmem_init);
1466static void __exit
1467fbmem_exit(void)
1468{
56b22935 1469 class_destroy(fb_class);
5a340cce 1470 unregister_chrdev(FB_MAJOR, "fb");
1da177e4
LT		 1471}
1472
1473module_exit(fbmem_exit);
1474MODULE_LICENSE("GPL");
1475MODULE_DESCRIPTION("Framebuffer base");
1476#else
1477subsys_initcall(fbmem_init);
1478#endif
1479
1480int fb_new_modelist(struct fb_info *info)
1481{
1482 struct fb_event event;
1483 struct fb_var_screeninfo var = info->var;
1484 struct list_head *pos, *n;
1485 struct fb_modelist *modelist;
1486 struct fb_videomode *m, mode;
1487 int err = 1;
1488
1489 list_for_each_safe(pos, n, &info->modelist) {
1490 modelist = list_entry(pos, struct fb_modelist, list);
1491 m = &modelist->mode;
1492 fb_videomode_to_var(&var, m);
1493 var.activate = FB_ACTIVATE_TEST;
1494 err = fb_set_var(info, &var);
1495 fb_var_to_videomode(&mode, &var);
1496 if (err || !fb_mode_is_equal(m, &mode)) {
1497 list_del(pos);
1498 kfree(pos);
1499 }
1500 }
1501
1502 err = 1;
1503
1504 if (!list_empty(&info->modelist)) {
1505 event.info = info;
256154fb 1506 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1da177e4
LT		 1507 }
1508
1509 return err;
1510}
1511
0128beee
HD		 1512static char *video_options[FB_MAX] __read_mostly;
1513static int ofonly __read_mostly;
1da177e4 1514
4dc3b16b
PP		 1515extern const char *global_mode_option;
1516
1da177e4
LT		 1517/**
1518 * fb_get_options - get kernel boot parameters
1519 * @name: framebuffer name as it would appear in
1520 * the boot parameter line
1521 * (video=<name>:<options>)
1522 * @option: the option will be stored here
1523 *
1524 * NOTE: Needed to maintain backwards compatibility
1525 */
1526int fb_get_options(char *name, char **option)
1527{
1528 char *opt, *options = NULL;
1529 int opt_len, retval = 0;
1530 int name_len = strlen(name), i;
1531
1532 if (name_len && ofonly && strncmp(name, "offb", 4))
1533 retval = 1;
1534
1535 if (name_len && !retval) {
1536 for (i = 0; i < FB_MAX; i++) {
1537 if (video_options[i] == NULL)
1538 continue;
1539 opt_len = strlen(video_options[i]);
1540 if (!opt_len)
1541 continue;
1542 opt = video_options[i];
1543 if (!strncmp(name, opt, name_len) &&
1544 opt[name_len] == ':')
1545 options = opt + name_len + 1;
1546 }
1547 }
1548 if (options && !strncmp(options, "off", 3))
1549 retval = 1;
1550
1551 if (option)
1552 *option = options;
1553
1554 return retval;
1555}
1556
bc6d7fdf 1557#ifndef MODULE
1da177e4
LT		 1558/**
1559 * video_setup - process command line options
1560 * @options: string of options
1561 *
1562 * Process command line options for frame buffer subsystem.
1563 *
1564 * NOTE: This function is a __setup and __init function.
1565 * It only stores the options. Drivers have to call
1566 * fb_get_options() as necessary.
1567 *
1568 * Returns zero.
1569 *
1570 */
75c96f85 1571static int __init video_setup(char *options)
1da177e4
LT		 1572{
1573 int i, global = 0;
1574
1575 if (!options || !*options)
1576 global = 1;
1577
1578 if (!global && !strncmp(options, "ofonly", 6)) {
1579 ofonly = 1;
1580 global = 1;
1581 }
1582
1583 if (!global && !strstr(options, "fb:")) {
1584 global_mode_option = options;
1585 global = 1;
1586 }
1587
1588 if (!global) {
1589 for (i = 0; i < FB_MAX; i++) {
1590 if (video_options[i] == NULL) {
1591 video_options[i] = options;
1592 break;
1593 }
1594
1595 }
1596 }
1597
9b41046c 1598 return 1;
1da177e4
LT		 1599}
1600__setup("video=", video_setup);
bc6d7fdf 1601#endif
1da177e4
LT		 1602
1603 /*
1604 * Visible symbols for modules
1605 */
1606
1607EXPORT_SYMBOL(register_framebuffer);
1608EXPORT_SYMBOL(unregister_framebuffer);
1609EXPORT_SYMBOL(num_registered_fb);
1610EXPORT_SYMBOL(registered_fb);
1611EXPORT_SYMBOL(fb_prepare_logo);
1612EXPORT_SYMBOL(fb_show_logo);
1613EXPORT_SYMBOL(fb_set_var);
1614EXPORT_SYMBOL(fb_blank);
1615EXPORT_SYMBOL(fb_pan_display);
1616EXPORT_SYMBOL(fb_get_buffer_offset);
1da177e4 1617EXPORT_SYMBOL(fb_set_suspend);
1da177e4 1618EXPORT_SYMBOL(fb_get_options);
1da177e4
LT		 1619
1620MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)