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fb: fsync() method for deferred I/O flush.
[deliverable/linux.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);
f837e6f7
AD		 357 image->dx = info->var.xres - image->width;
358 image->dy = info->var.yres - image->height;
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;
f837e6f7
AD		 365 image->dx = info->var.xres - image->width;
366 } else if (rotate == FB_ROTATE_CCW) {
9c44e5f6
AD		 367 fb_rotate_logo_ccw(image->data, dst, image->width,
368 image->height);
f837e6f7
AD		 369 tmp = image->width;
370 image->width = image->height;
371 image->height = tmp;
372 image->dy = info->var.yres - image->height;
9c44e5f6
AD		 373 }
374
375 image->data = dst;
376}
377
378static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
379 int rotate)
380{
381 int x;
382
383 if (rotate == FB_ROTATE_UR) {
384 for (x = 0; x < num_online_cpus() &&
385 x * (fb_logo.logo->width + 8) <=
386 info->var.xres - fb_logo.logo->width; x++) {
387 info->fbops->fb_imageblit(info, image);
388 image->dx += fb_logo.logo->width + 8;
389 }
390 } else if (rotate == FB_ROTATE_UD) {
391 for (x = 0; x < num_online_cpus() &&
392 x * (fb_logo.logo->width + 8) <=
393 info->var.xres - fb_logo.logo->width; x++) {
394 info->fbops->fb_imageblit(info, image);
395 image->dx -= fb_logo.logo->width + 8;
396 }
397 } else if (rotate == FB_ROTATE_CW) {
398 for (x = 0; x < num_online_cpus() &&
399 x * (fb_logo.logo->width + 8) <=
400 info->var.yres - fb_logo.logo->width; x++) {
401 info->fbops->fb_imageblit(info, image);
402 image->dy += fb_logo.logo->width + 8;
403 }
404 } else if (rotate == FB_ROTATE_CCW) {
405 for (x = 0; x < num_online_cpus() &&
406 x * (fb_logo.logo->width + 8) <=
407 info->var.yres - fb_logo.logo->width; x++) {
408 info->fbops->fb_imageblit(info, image);
409 image->dy -= fb_logo.logo->width + 8;
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
421 if (info->flags & FBINFO_MISC_TILEBLITTING)
422 return 0;
423
424 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
425 depth = info->var.blue.length;
426 if (info->var.red.length < depth)
427 depth = info->var.red.length;
428 if (info->var.green.length < depth)
429 depth = info->var.green.length;
430 }
431
0c683dbf 432 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
397eeab3
AD		 433 /* assume console colormap */
434 depth = 4;
435 }
436
1da177e4
LT		 437 if (depth >= 8) {
438 switch (info->fix.visual) {
439 case FB_VISUAL_TRUECOLOR:
440 fb_logo.needs_truepalette = 1;
441 break;
442 case FB_VISUAL_DIRECTCOLOR:
443 fb_logo.needs_directpalette = 1;
444 fb_logo.needs_cmapreset = 1;
445 break;
446 case FB_VISUAL_PSEUDOCOLOR:
447 fb_logo.needs_cmapreset = 1;
448 break;
449 }
450 }
451
452 /* Return if no suitable logo was found */
453 fb_logo.logo = fb_find_logo(depth);
6d9885a8
JS		 454
455 if (!fb_logo.logo) {
456 return 0;
457 }
1da177e4 458
9c44e5f6
AD		 459 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
460 yres = info->var.yres;
461 else
462 yres = info->var.xres;
463
6d9885a8 464 if (fb_logo.logo->height > yres) {
1da177e4
LT		 465 fb_logo.logo = NULL;
466 return 0;
467 }
9c44e5f6 468
1da177e4
LT		 469 /* What depth we asked for might be different from what we get */
470 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
471 fb_logo.depth = 8;
472 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
473 fb_logo.depth = 4;
474 else
475 fb_logo.depth = 1;
476 return fb_logo.logo->height;
477}
478
9c44e5f6 479int fb_show_logo(struct fb_info *info, int rotate)
1da177e4
LT		 480{
481 u32 *palette = NULL, *saved_pseudo_palette = NULL;
9c44e5f6 482 unsigned char *logo_new = NULL, *logo_rotate = NULL;
1da177e4 483 struct fb_image image;
1da177e4
LT		 484
485 /* Return if the frame buffer is not mapped or suspended */
486 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
487 return 0;
488
489 image.depth = 8;
490 image.data = fb_logo.logo->data;
491
492 if (fb_logo.needs_cmapreset)
493 fb_set_logocmap(info, fb_logo.logo);
494
495 if (fb_logo.needs_truepalette ||
496 fb_logo.needs_directpalette) {
497 palette = kmalloc(256 * 4, GFP_KERNEL);
498 if (palette == NULL)
499 return 0;
500
501 if (fb_logo.needs_truepalette)
502 fb_set_logo_truepalette(info, fb_logo.logo, palette);
503 else
504 fb_set_logo_directpalette(info, fb_logo.logo, palette);
505
506 saved_pseudo_palette = info->pseudo_palette;
507 info->pseudo_palette = palette;
508 }
509
510 if (fb_logo.depth <= 4) {
511 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
512 GFP_KERNEL);
513 if (logo_new == NULL) {
514 kfree(palette);
515 if (saved_pseudo_palette)
516 info->pseudo_palette = saved_pseudo_palette;
517 return 0;
518 }
519 image.data = logo_new;
520 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
521 }
522
9c44e5f6
AD		 523 image.dx = 0;
524 image.dy = 0;
1da177e4
LT		 525 image.width = fb_logo.logo->width;
526 image.height = fb_logo.logo->height;
1da177e4 527
9c44e5f6
AD		 528 if (rotate) {
529 logo_rotate = kmalloc(fb_logo.logo->width *
530 fb_logo.logo->height, GFP_KERNEL);
531 if (logo_rotate)
532 fb_rotate_logo(info, logo_rotate, &image, rotate);
1da177e4 533 }
9c44e5f6
AD		 534
535 fb_do_show_logo(info, &image, rotate);
536
1da177e4
LT		 537 kfree(palette);
538 if (saved_pseudo_palette != NULL)
539 info->pseudo_palette = saved_pseudo_palette;
540 kfree(logo_new);
9c44e5f6 541 kfree(logo_rotate);
1da177e4
LT		 542 return fb_logo.logo->height;
543}
544#else
9c44e5f6
AD		 545int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
546int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
1da177e4
LT		 547#endif /* CONFIG_LOGO */
548
549static int fbmem_read_proc(char *buf, char **start, off_t offset,
550 int len, int *eof, void *private)
551{
552 struct fb_info **fi;
553 int clen;
554
555 clen = 0;
a09fd48f
GU		 556 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
557 fi++)
1da177e4
LT		 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;
ad9a824e 574 struct inode *inode = file->f_path.dentry->d_inode;
1da177e4
LT		 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;
ad9a824e 649 struct inode *inode = file->f_path.dentry->d_inode;
1da177e4
LT		 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)
6a2a8866 672 return -EFBIG;
0a484a3a 673
6a2a8866
AD		 674 if (count > total_size) {
675 err = -EFBIG;
0a484a3a 676 count = total_size;
6a2a8866
AD		 677 }
678
679 if (count + p > total_size) {
680 if (!err)
681 err = -ENOSPC;
0a484a3a 682
0a484a3a 683 count = total_size - p;
6a2a8866 684 }
0a484a3a 685
1da177e4
LT		 686 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
687 GFP_KERNEL);
688 if (!buffer)
689 return -ENOMEM;
690
691 dst = (u32 __iomem *) (info->screen_base + p);
692
693 if (info->fbops->fb_sync)
694 info->fbops->fb_sync(info);
695
696 while (count) {
697 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
698 src = buffer;
0a484a3a 699
1da177e4
LT		 700 if (copy_from_user(src, buf, c)) {
701 err = -EFAULT;
702 break;
703 }
0a484a3a 704
1da177e4
LT		 705 for (i = c >> 2; i--; )
706 fb_writel(*src++, dst++);
0a484a3a 707
1da177e4
LT		 708 if (c & 3) {
709 u8 *src8 = (u8 *) src;
710 u8 __iomem *dst8 = (u8 __iomem *) dst;
711
712 for (i = c & 3; i--; )
713 fb_writeb(*src8++, dst8++);
714
715 dst = (u32 __iomem *) dst8;
716 }
0a484a3a 717
1da177e4
LT		 718 *ppos += c;
719 buf += c;
720 cnt += c;
721 count -= c;
722 }
0a484a3a 723
1da177e4
LT		 724 kfree(buffer);
725
6a2a8866 726 return (cnt) ? cnt : err;
1da177e4
LT		 727}
728
729#ifdef CONFIG_KMOD
730static void try_to_load(int fb)
731{
732 request_module("fb%d", fb);
733}
734#endif /* CONFIG_KMOD */
735
736int
737fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
738{
1207069f 739 struct fb_fix_screeninfo *fix = &info->fix;
1da177e4
LT		 740 int xoffset = var->xoffset;
741 int yoffset = var->yoffset;
1207069f
AD		 742 int err = 0, yres = info->var.yres;
743
744 if (var->yoffset > 0) {
745 if (var->vmode & FB_VMODE_YWRAP) {
746 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
747 err = -EINVAL;
748 else
749 yres = 0;
750 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
751 err = -EINVAL;
752 }
753
754 if (var->xoffset > 0 && (!fix->xpanstep ||
755 (var->xoffset % fix->xpanstep)))
756 err = -EINVAL;
757
758 if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
759 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
760 var->xoffset + info->var.xres > info->var.xres_virtual)
761 return -EINVAL;
1da177e4 762
1da177e4
LT		 763 if ((err = info->fbops->fb_pan_display(var, info)))
764 return err;
765 info->var.xoffset = var->xoffset;
766 info->var.yoffset = var->yoffset;
767 if (var->vmode & FB_VMODE_YWRAP)
768 info->var.vmode |= FB_VMODE_YWRAP;
769 else
770 info->var.vmode &= ~FB_VMODE_YWRAP;
771 return 0;
772}
773
774int
775fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
776{
3edea483 777 int err, flags = info->flags;
1da177e4
LT		 778
779 if (var->activate & FB_ACTIVATE_INV_MODE) {
780 struct fb_videomode mode1, mode2;
781 int ret = 0;
782
783 fb_var_to_videomode(&mode1, var);
784 fb_var_to_videomode(&mode2, &info->var);
785 /* make sure we don't delete the videomode of current var */
786 ret = fb_mode_is_equal(&mode1, &mode2);
787
788 if (!ret) {
789 struct fb_event event;
790
791 event.info = info;
792 event.data = &mode1;
256154fb 793 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
1da177e4
LT		 794 }
795
796 if (!ret)
797 fb_delete_videomode(&mode1, &info->modelist);
798
799 return ret;
800 }
801
802 if ((var->activate & FB_ACTIVATE_FORCE) ||
803 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
804 if (!info->fbops->fb_check_var) {
805 *var = info->var;
806 return 0;
807 }
808
809 if ((err = info->fbops->fb_check_var(var, info)))
810 return err;
811
812 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
813 struct fb_videomode mode;
814 int err = 0;
815
816 info->var = *var;
817 if (info->fbops->fb_set_par)
818 info->fbops->fb_set_par(info);
819
820 fb_pan_display(info, &info->var);
821
822 fb_set_cmap(&info->cmap, info);
823
824 fb_var_to_videomode(&mode, &info->var);
825
826 if (info->modelist.prev && info->modelist.next &&
827 !list_empty(&info->modelist))
828 err = fb_add_videomode(&mode, &info->modelist);
829
3edea483 830 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
1da177e4 831 struct fb_event event;
7726e9e1
AD		 832 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
833 FB_EVENT_MODE_CHANGE_ALL :
834 FB_EVENT_MODE_CHANGE;
1da177e4
LT		 835
836 info->flags &= ~FBINFO_MISC_USEREVENT;
837 event.info = info;
256154fb 838 fb_notifier_call_chain(evnt, &event);
1da177e4
LT		 839 }
840 }
841 }
842 return 0;
843}
844
845int
846fb_blank(struct fb_info *info, int blank)
847{
848 int ret = -EINVAL;
849
850 if (blank > FB_BLANK_POWERDOWN)
851 blank = FB_BLANK_POWERDOWN;
852
853 if (info->fbops->fb_blank)
854 ret = info->fbops->fb_blank(blank, info);
855
856 if (!ret) {
857 struct fb_event event;
858
859 event.info = info;
860 event.data = &blank;
256154fb 861 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1da177e4
LT		 862 }
863
864 return ret;
865}
866
867static int
868fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
869 unsigned long arg)
870{
871 int fbidx = iminor(inode);
872 struct fb_info *info = registered_fb[fbidx];
873 struct fb_ops *fb = info->fbops;
874 struct fb_var_screeninfo var;
875 struct fb_fix_screeninfo fix;
876 struct fb_con2fbmap con2fb;
877 struct fb_cmap_user cmap;
878 struct fb_event event;
879 void __user *argp = (void __user *)arg;
880 int i;
881
882 if (!fb)
883 return -ENODEV;
884 switch (cmd) {
885 case FBIOGET_VSCREENINFO:
886 return copy_to_user(argp, &info->var,
887 sizeof(var)) ? -EFAULT : 0;
888 case FBIOPUT_VSCREENINFO:
889 if (copy_from_user(&var, argp, sizeof(var)))
890 return -EFAULT;
891 acquire_console_sem();
892 info->flags |= FBINFO_MISC_USEREVENT;
893 i = fb_set_var(info, &var);
894 info->flags &= ~FBINFO_MISC_USEREVENT;
895 release_console_sem();
896 if (i) return i;
897 if (copy_to_user(argp, &var, sizeof(var)))
898 return -EFAULT;
899 return 0;
900 case FBIOGET_FSCREENINFO:
901 return copy_to_user(argp, &info->fix,
902 sizeof(fix)) ? -EFAULT : 0;
903 case FBIOPUTCMAP:
904 if (copy_from_user(&cmap, argp, sizeof(cmap)))
905 return -EFAULT;
906 return (fb_set_user_cmap(&cmap, info));
907 case FBIOGETCMAP:
908 if (copy_from_user(&cmap, argp, sizeof(cmap)))
909 return -EFAULT;
910 return fb_cmap_to_user(&info->cmap, &cmap);
911 case FBIOPAN_DISPLAY:
912 if (copy_from_user(&var, argp, sizeof(var)))
913 return -EFAULT;
914 acquire_console_sem();
915 i = fb_pan_display(info, &var);
916 release_console_sem();
917 if (i)
918 return i;
919 if (copy_to_user(argp, &var, sizeof(var)))
920 return -EFAULT;
921 return 0;
922 case FBIO_CURSOR:
923 return -EINVAL;
924 case FBIOGET_CON2FBMAP:
925 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
926 return -EFAULT;
927 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
928 return -EINVAL;
929 con2fb.framebuffer = -1;
930 event.info = info;
931 event.data = &con2fb;
256154fb 932 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1da177e4
LT		 933 return copy_to_user(argp, &con2fb,
934 sizeof(con2fb)) ? -EFAULT : 0;
935 case FBIOPUT_CON2FBMAP:
936 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
937 return - EFAULT;
938 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
939 return -EINVAL;
940 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
941 return -EINVAL;
942#ifdef CONFIG_KMOD
943 if (!registered_fb[con2fb.framebuffer])
944 try_to_load(con2fb.framebuffer);
945#endif /* CONFIG_KMOD */
946 if (!registered_fb[con2fb.framebuffer])
947 return -EINVAL;
948 event.info = info;
949 event.data = &con2fb;
256154fb
AD		 950 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
951 &event);
1da177e4
LT		 952 case FBIOBLANK:
953 acquire_console_sem();
954 info->flags |= FBINFO_MISC_USEREVENT;
955 i = fb_blank(info, arg);
956 info->flags &= ~FBINFO_MISC_USEREVENT;
957 release_console_sem();
958 return i;
959 default:
960 if (fb->fb_ioctl == NULL)
961 return -EINVAL;
67a6680d 962 return fb->fb_ioctl(info, cmd, arg);
1da177e4
LT		 963 }
964}
965
966#ifdef CONFIG_COMPAT
c7f82d9c
AB		 967struct fb_fix_screeninfo32 {
968 char id[16];
969 compat_caddr_t smem_start;
970 u32 smem_len;
971 u32 type;
972 u32 type_aux;
973 u32 visual;
974 u16 xpanstep;
975 u16 ypanstep;
976 u16 ywrapstep;
977 u32 line_length;
978 compat_caddr_t mmio_start;
979 u32 mmio_len;
980 u32 accel;
981 u16 reserved[3];
982};
983
984struct fb_cmap32 {
985 u32 start;
986 u32 len;
987 compat_caddr_t red;
988 compat_caddr_t green;
989 compat_caddr_t blue;
990 compat_caddr_t transp;
991};
992
993static int fb_getput_cmap(struct inode *inode, struct file *file,
994 unsigned int cmd, unsigned long arg)
995{
996 struct fb_cmap_user __user *cmap;
997 struct fb_cmap32 __user *cmap32;
998 __u32 data;
999 int err;
1000
1001 cmap = compat_alloc_user_space(sizeof(*cmap));
1002 cmap32 = compat_ptr(arg);
1003
1004 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1005 return -EFAULT;
1006
1007 if (get_user(data, &cmap32->red) ||
1008 put_user(compat_ptr(data), &cmap->red) ||
1009 get_user(data, &cmap32->green) ||
1010 put_user(compat_ptr(data), &cmap->green) ||
1011 get_user(data, &cmap32->blue) ||
1012 put_user(compat_ptr(data), &cmap->blue) ||
1013 get_user(data, &cmap32->transp) ||
1014 put_user(compat_ptr(data), &cmap->transp))
1015 return -EFAULT;
1016
1017 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1018
1019 if (!err) {
1020 if (copy_in_user(&cmap32->start,
1021 &cmap->start,
1022 2 * sizeof(__u32)))
1023 err = -EFAULT;
1024 }
1025 return err;
1026}
1027
1028static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1029 struct fb_fix_screeninfo32 __user *fix32)
1030{
1031 __u32 data;
1032 int err;
1033
1034 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1035
1036 data = (__u32) (unsigned long) fix->smem_start;
1037 err |= put_user(data, &fix32->smem_start);
1038
1039 err |= put_user(fix->smem_len, &fix32->smem_len);
1040 err |= put_user(fix->type, &fix32->type);
1041 err |= put_user(fix->type_aux, &fix32->type_aux);
1042 err |= put_user(fix->visual, &fix32->visual);
1043 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1044 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1045 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1046 err |= put_user(fix->line_length, &fix32->line_length);
1047
1048 data = (__u32) (unsigned long) fix->mmio_start;
1049 err |= put_user(data, &fix32->mmio_start);
1050
1051 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1052 err |= put_user(fix->accel, &fix32->accel);
1053 err |= copy_to_user(fix32->reserved, fix->reserved,
1054 sizeof(fix->reserved));
1055
1056 return err;
1057}
1058
1059static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1060 unsigned int cmd, unsigned long arg)
1061{
1062 mm_segment_t old_fs;
1063 struct fb_fix_screeninfo fix;
1064 struct fb_fix_screeninfo32 __user *fix32;
1065 int err;
1066
1067 fix32 = compat_ptr(arg);
1068
1069 old_fs = get_fs();
1070 set_fs(KERNEL_DS);
1071 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1072 set_fs(old_fs);
1073
1074 if (!err)
1075 err = do_fscreeninfo_to_user(&fix, fix32);
1076
1077 return err;
1078}
1079
1da177e4
LT		 1080static long
1081fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1082{
ad9a824e 1083 struct inode *inode = file->f_path.dentry->d_inode;
c7f82d9c 1084 int fbidx = iminor(inode);
1da177e4
LT		 1085 struct fb_info *info = registered_fb[fbidx];
1086 struct fb_ops *fb = info->fbops;
c7f82d9c 1087 long ret = -ENOIOCTLCMD;
1da177e4 1088
1da177e4 1089 lock_kernel();
c7f82d9c
AB		 1090 switch(cmd) {
1091 case FBIOGET_VSCREENINFO:
1092 case FBIOPUT_VSCREENINFO:
1093 case FBIOPAN_DISPLAY:
1094 case FBIOGET_CON2FBMAP:
1095 case FBIOPUT_CON2FBMAP:
1096 arg = (unsigned long) compat_ptr(arg);
1097 case FBIOBLANK:
1098 ret = fb_ioctl(inode, file, cmd, arg);
1099 break;
1100
1101 case FBIOGET_FSCREENINFO:
1102 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1103 break;
1104
1105 case FBIOGETCMAP:
1106 case FBIOPUTCMAP:
1107 ret = fb_getput_cmap(inode, file, cmd, arg);
1108 break;
1109
1110 default:
1111 if (fb->fb_compat_ioctl)
67a6680d 1112 ret = fb->fb_compat_ioctl(info, cmd, arg);
c7f82d9c
AB		 1113 break;
1114 }
1da177e4
LT		 1115 unlock_kernel();
1116 return ret;
1117}
1118#endif
1119
1120static int
1121fb_mmap(struct file *file, struct vm_area_struct * vma)
1122{
ad9a824e 1123 int fbidx = iminor(file->f_path.dentry->d_inode);
1da177e4
LT		 1124 struct fb_info *info = registered_fb[fbidx];
1125 struct fb_ops *fb = info->fbops;
1126 unsigned long off;
1127#if !defined(__sparc__) || defined(__sparc_v9__)
1128 unsigned long start;
1129 u32 len;
1130#endif
1131
1132 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1133 return -EINVAL;
1134 off = vma->vm_pgoff << PAGE_SHIFT;
1135 if (!fb)
1136 return -ENODEV;
1137 if (fb->fb_mmap) {
1138 int res;
1139 lock_kernel();
216d526c 1140 res = fb->fb_mmap(info, vma);
1da177e4
LT		 1141 unlock_kernel();
1142 return res;
1143 }
1144
1145#if defined(__sparc__) && !defined(__sparc_v9__)
1146 /* Should never get here, all fb drivers should have their own
1147 mmap routines */
1148 return -EINVAL;
1149#else
1150 /* !sparc32... */
1151 lock_kernel();
1152
1153 /* frame buffer memory */
1154 start = info->fix.smem_start;
1155 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1156 if (off >= len) {
1157 /* memory mapped io */
1158 off -= len;
1159 if (info->var.accel_flags) {
1160 unlock_kernel();
1161 return -EINVAL;
1162 }
1163 start = info->fix.mmio_start;
1164 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1165 }
1166 unlock_kernel();
1167 start &= PAGE_MASK;
1168 if ((vma->vm_end - vma->vm_start + off) > len)
1169 return -EINVAL;
1170 off += start;
1171 vma->vm_pgoff = off >> PAGE_SHIFT;
1172 /* This is an IO map - tell maydump to skip this VMA */
1173 vma->vm_flags |= VM_IO | VM_RESERVED;
1da177e4
LT		 1174#if defined(__mc68000__)
1175#if defined(CONFIG_SUN3)
1176 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1177#elif defined(CONFIG_MMU)
1178 if (CPU_IS_020_OR_030)
1179 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1180 if (CPU_IS_040_OR_060) {
1181 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1182 /* Use no-cache mode, serialized */
1183 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1184 }
1185#endif
1186#elif defined(__powerpc__)
8b150478 1187 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1da177e4
LT		 1188 vma->vm_end - vma->vm_start,
1189 vma->vm_page_prot);
1190#elif defined(__alpha__)
1191 /* Caching is off in the I/O space quadrant by design. */
1192#elif defined(__i386__) || defined(__x86_64__)
1193 if (boot_cpu_data.x86 > 3)
1194 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
14778d90 1195#elif defined(__mips__) || defined(__sparc_v9__)
1da177e4
LT		 1196 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1197#elif defined(__hppa__)
1198 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1199#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1200 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1201#elif defined(__ia64__)
1202 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1203 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1204 else
1205 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1206#else
1207#warning What do we have to do here??
1208#endif
1209 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1210 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1211 return -EAGAIN;
1da177e4
LT		 1212 return 0;
1213#endif /* !sparc32 */
1214}
1215
1216static int
1217fb_open(struct inode *inode, struct file *file)
1218{
1219 int fbidx = iminor(inode);
1220 struct fb_info *info;
1221 int res = 0;
1222
1223 if (fbidx >= FB_MAX)
1224 return -ENODEV;
1225#ifdef CONFIG_KMOD
1226 if (!(info = registered_fb[fbidx]))
1227 try_to_load(fbidx);
1228#endif /* CONFIG_KMOD */
1229 if (!(info = registered_fb[fbidx]))
1230 return -ENODEV;
1231 if (!try_module_get(info->fbops->owner))
1232 return -ENODEV;
cae8a12f 1233 file->private_data = info;
1da177e4
LT		 1234 if (info->fbops->fb_open) {
1235 res = info->fbops->fb_open(info,1);
1236 if (res)
1237 module_put(info->fbops->owner);
1238 }
1239 return res;
1240}
1241
1242static int
1243fb_release(struct inode *inode, struct file *file)
1244{
cae8a12f 1245 struct fb_info * const info = file->private_data;
1da177e4
LT		 1246
1247 lock_kernel();
1da177e4
LT		 1248 if (info->fbops->fb_release)
1249 info->fbops->fb_release(info,1);
1250 module_put(info->fbops->owner);
1251 unlock_kernel();
1252 return 0;
1253}
1254
0128beee 1255static const struct file_operations fb_fops = {
1da177e4
LT		 1256 .owner = THIS_MODULE,
1257 .read = fb_read,
1258 .write = fb_write,
1259 .ioctl = fb_ioctl,
1260#ifdef CONFIG_COMPAT
1261 .compat_ioctl = fb_compat_ioctl,
1262#endif
1263 .mmap = fb_mmap,
1264 .open = fb_open,
1265 .release = fb_release,
1266#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1267 .get_unmapped_area = get_fb_unmapped_area,
1268#endif
5e841b88
PM		 1269#ifdef CONFIG_FB_DEFERRED_IO
1270 .fsync = fb_deferred_io_fsync,
1271#endif
1da177e4
LT		 1272};
1273
9a179176
AD		 1274struct class *fb_class;
1275EXPORT_SYMBOL(fb_class);
1da177e4
LT		 1276/**
1277 * register_framebuffer - registers a frame buffer device
1278 * @fb_info: frame buffer info structure
1279 *
1280 * Registers a frame buffer device @fb_info.
1281 *
1282 * Returns negative errno on error, or zero for success.
1283 *
1284 */
1285
1286int
1287register_framebuffer(struct fb_info *fb_info)
1288{
1289 int i;
1290 struct fb_event event;
96fe6a21 1291 struct fb_videomode mode;
1da177e4
LT		 1292
1293 if (num_registered_fb == FB_MAX)
1294 return -ENXIO;
1295 num_registered_fb++;
1296 for (i = 0 ; i < FB_MAX; i++)
1297 if (!registered_fb[i])
1298 break;
1299 fb_info->node = i;
1300
78cde088
GKH		 1301 fb_info->dev = device_create(fb_class, fb_info->device,
1302 MKDEV(FB_MAJOR, i), "fb%d", i);
1303 if (IS_ERR(fb_info->dev)) {
1da177e4 1304 /* Not fatal */
78cde088
GKH		 1305 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1306 fb_info->dev = NULL;
1da177e4 1307 } else
78cde088 1308 fb_init_device(fb_info);
1da177e4
LT		 1309
1310 if (fb_info->pixmap.addr == NULL) {
1311 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1312 if (fb_info->pixmap.addr) {
1313 fb_info->pixmap.size = FBPIXMAPSIZE;
1314 fb_info->pixmap.buf_align = 1;
1315 fb_info->pixmap.scan_align = 1;
58a60643 1316 fb_info->pixmap.access_align = 32;
1da177e4
LT		 1317 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1318 }
1319 }
1320 fb_info->pixmap.offset = 0;
1321
96fe6a21 1322 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1da177e4 1323 INIT_LIST_HEAD(&fb_info->modelist);
1da177e4 1324
96fe6a21
AD		 1325 fb_var_to_videomode(&mode, &fb_info->var);
1326 fb_add_videomode(&mode, &fb_info->modelist);
1da177e4
LT		 1327 registered_fb[i] = fb_info;
1328
1da177e4 1329 event.info = fb_info;
256154fb 1330 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1da177e4
LT		 1331 return 0;
1332}
1333
1334
1335/**
1336 * unregister_framebuffer - releases a frame buffer device
1337 * @fb_info: frame buffer info structure
1338 *
1339 * Unregisters a frame buffer device @fb_info.
1340 *
1341 * Returns negative errno on error, or zero for success.
1342 *
1343 */
1344
1345int
1346unregister_framebuffer(struct fb_info *fb_info)
1347{
e614b18d 1348 struct fb_event event;
1da177e4
LT		 1349 int i;
1350
1351 i = fb_info->node;
1352 if (!registered_fb[i])
1353 return -EINVAL;
1da177e4 1354
e614b18d
AD		 1355 if (fb_info->pixmap.addr &&
1356 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1da177e4
LT		 1357 kfree(fb_info->pixmap.addr);
1358 fb_destroy_modelist(&fb_info->modelist);
1359 registered_fb[i]=NULL;
1360 num_registered_fb--;
78cde088
GKH		 1361 fb_cleanup_device(fb_info);
1362 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
e614b18d 1363 event.info = fb_info;
256154fb 1364 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1da177e4
LT		 1365 return 0;
1366}
1367
1da177e4
LT		 1368/**
1369 * fb_set_suspend - low level driver signals suspend
1370 * @info: framebuffer affected
1371 * @state: 0 = resuming, !=0 = suspending
1372 *
1373 * This is meant to be used by low level drivers to
1374 * signal suspend/resume to the core & clients.
1375 * It must be called with the console semaphore held
1376 */
1377void fb_set_suspend(struct fb_info *info, int state)
1378{
1379 struct fb_event event;
1380
1381 event.info = info;
1382 if (state) {
256154fb 1383 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1da177e4
LT		 1384 info->state = FBINFO_STATE_SUSPENDED;
1385 } else {
1386 info->state = FBINFO_STATE_RUNNING;
256154fb 1387 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1da177e4
LT		 1388 }
1389}
1390
1391/**
1392 * fbmem_init - init frame buffer subsystem
1393 *
1394 * Initialize the frame buffer subsystem.
1395 *
1396 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1397 *
1398 */
1399
1400static int __init
1401fbmem_init(void)
1402{
1403 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1404
1da177e4
LT		 1405 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1406 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1407
56b22935 1408 fb_class = class_create(THIS_MODULE, "graphics");
1da177e4
LT		 1409 if (IS_ERR(fb_class)) {
1410 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1411 fb_class = NULL;
1412 }
1413 return 0;
1414}
1415
1416#ifdef MODULE
1417module_init(fbmem_init);
1418static void __exit
1419fbmem_exit(void)
1420{
56b22935 1421 class_destroy(fb_class);
5a340cce 1422 unregister_chrdev(FB_MAJOR, "fb");
1da177e4
LT		 1423}
1424
1425module_exit(fbmem_exit);
1426MODULE_LICENSE("GPL");
1427MODULE_DESCRIPTION("Framebuffer base");
1428#else
1429subsys_initcall(fbmem_init);
1430#endif
1431
1432int fb_new_modelist(struct fb_info *info)
1433{
1434 struct fb_event event;
1435 struct fb_var_screeninfo var = info->var;
1436 struct list_head *pos, *n;
1437 struct fb_modelist *modelist;
1438 struct fb_videomode *m, mode;
1439 int err = 1;
1440
1441 list_for_each_safe(pos, n, &info->modelist) {
1442 modelist = list_entry(pos, struct fb_modelist, list);
1443 m = &modelist->mode;
1444 fb_videomode_to_var(&var, m);
1445 var.activate = FB_ACTIVATE_TEST;
1446 err = fb_set_var(info, &var);
1447 fb_var_to_videomode(&mode, &var);
1448 if (err || !fb_mode_is_equal(m, &mode)) {
1449 list_del(pos);
1450 kfree(pos);
1451 }
1452 }
1453
1454 err = 1;
1455
1456 if (!list_empty(&info->modelist)) {
1457 event.info = info;
256154fb 1458 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1da177e4
LT		 1459 }
1460
1461 return err;
1462}
1463
0128beee
HD		 1464static char *video_options[FB_MAX] __read_mostly;
1465static int ofonly __read_mostly;
1da177e4 1466
4dc3b16b
PP		 1467extern const char *global_mode_option;
1468
1da177e4
LT		 1469/**
1470 * fb_get_options - get kernel boot parameters
1471 * @name: framebuffer name as it would appear in
1472 * the boot parameter line
1473 * (video=<name>:<options>)
1474 * @option: the option will be stored here
1475 *
1476 * NOTE: Needed to maintain backwards compatibility
1477 */
1478int fb_get_options(char *name, char **option)
1479{
1480 char *opt, *options = NULL;
1481 int opt_len, retval = 0;
1482 int name_len = strlen(name), i;
1483
1484 if (name_len && ofonly && strncmp(name, "offb", 4))
1485 retval = 1;
1486
1487 if (name_len && !retval) {
1488 for (i = 0; i < FB_MAX; i++) {
1489 if (video_options[i] == NULL)
1490 continue;
1491 opt_len = strlen(video_options[i]);
1492 if (!opt_len)
1493 continue;
1494 opt = video_options[i];
1495 if (!strncmp(name, opt, name_len) &&
1496 opt[name_len] == ':')
1497 options = opt + name_len + 1;
1498 }
1499 }
1500 if (options && !strncmp(options, "off", 3))
1501 retval = 1;
1502
1503 if (option)
1504 *option = options;
1505
1506 return retval;
1507}
1508
bc6d7fdf 1509#ifndef MODULE
1da177e4
LT		 1510/**
1511 * video_setup - process command line options
1512 * @options: string of options
1513 *
1514 * Process command line options for frame buffer subsystem.
1515 *
1516 * NOTE: This function is a __setup and __init function.
1517 * It only stores the options. Drivers have to call
1518 * fb_get_options() as necessary.
1519 *
1520 * Returns zero.
1521 *
1522 */
75c96f85 1523static int __init video_setup(char *options)
1da177e4
LT		 1524{
1525 int i, global = 0;
1526
1527 if (!options || !*options)
1528 global = 1;
1529
1530 if (!global && !strncmp(options, "ofonly", 6)) {
1531 ofonly = 1;
1532 global = 1;
1533 }
1534
1535 if (!global && !strstr(options, "fb:")) {
1536 global_mode_option = options;
1537 global = 1;
1538 }
1539
1540 if (!global) {
1541 for (i = 0; i < FB_MAX; i++) {
1542 if (video_options[i] == NULL) {
1543 video_options[i] = options;
1544 break;
1545 }
1546
1547 }
1548 }
1549
9b41046c 1550 return 1;
1da177e4
LT		 1551}
1552__setup("video=", video_setup);
bc6d7fdf 1553#endif
1da177e4
LT		 1554
1555 /*
1556 * Visible symbols for modules
1557 */
1558
1559EXPORT_SYMBOL(register_framebuffer);
1560EXPORT_SYMBOL(unregister_framebuffer);
1561EXPORT_SYMBOL(num_registered_fb);
1562EXPORT_SYMBOL(registered_fb);
1563EXPORT_SYMBOL(fb_prepare_logo);
1564EXPORT_SYMBOL(fb_show_logo);
1565EXPORT_SYMBOL(fb_set_var);
1566EXPORT_SYMBOL(fb_blank);
1567EXPORT_SYMBOL(fb_pan_display);
1568EXPORT_SYMBOL(fb_get_buffer_offset);
1da177e4 1569EXPORT_SYMBOL(fb_set_suspend);
1da177e4 1570EXPORT_SYMBOL(fb_get_options);
1da177e4
LT		 1571
1572MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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