projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] radeonfb: Only request resources we need
[linux-2.6-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
14#include <linux/config.h>
15#include <linux/module.h>
16
17#include <linux/types.h>
18#include <linux/errno.h>
19#include <linux/sched.h>
20#include <linux/smp_lock.h>
21#include <linux/kernel.h>
22#include <linux/major.h>
23#include <linux/slab.h>
24#include <linux/mm.h>
25#include <linux/mman.h>
26#include <linux/tty.h>
27#include <linux/init.h>
28#include <linux/linux_logo.h>
29#include <linux/proc_fs.h>
30#include <linux/console.h>
31#ifdef CONFIG_KMOD
32#include <linux/kmod.h>
33#endif
34#include <linux/devfs_fs_kernel.h>
35#include <linux/err.h>
36#include <linux/kernel.h>
37#include <linux/device.h>
38#include <linux/efi.h>
39
40#if defined(__mc68000__) || defined(CONFIG_APUS)
41#include <asm/setup.h>
42#endif
43
44#include <asm/io.h>
45#include <asm/uaccess.h>
46#include <asm/page.h>
47#include <asm/pgtable.h>
48
49#include <linux/fb.h>
50
51 /*
52 * Frame buffer device initialization and setup routines
53 */
54
55#define FBPIXMAPSIZE (1024 * 8)
56
57static struct notifier_block *fb_notifier_list;
58struct fb_info *registered_fb[FB_MAX];
59int num_registered_fb;
60
61/*
62 * Helpers
63 */
64
b8c90945
AD		 65int fb_get_color_depth(struct fb_var_screeninfo *var,
66 struct fb_fix_screeninfo *fix)
1da177e4 67{
b8c90945
AD		 68 int depth = 0;
69
70 if (fix->visual == FB_VISUAL_MONO01 ||
71 fix->visual == FB_VISUAL_MONO10)
72 depth = 1;
73 else {
74 if (var->green.length == var->blue.length &&
75 var->green.length == var->red.length &&
76 var->green.offset == var->blue.offset &&
77 var->green.offset == var->red.offset)
78 depth = var->green.length;
79 else
80 depth = var->green.length + var->red.length +
81 var->blue.length;
82 }
83
84 return depth;
1da177e4
LT		 85}
86EXPORT_SYMBOL(fb_get_color_depth);
87
88/*
f5a9951c 89 * Data padding functions.
1da177e4 90 */
f1ab5dac 91void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
1da177e4 92{
e4c5c820 93 int i, j;
1da177e4
LT		 94
95 for (i = height; i--; ) {
e4c5c820
AD		 96 /* s_pitch is a few bytes at the most, memcpy is suboptimal */
97 for (j = 0; j < s_pitch; j++)
98 dst[j] = src[j];
1da177e4
LT		 99 src += s_pitch;
100 dst += d_pitch;
101 }
102}
f1ab5dac 103EXPORT_SYMBOL(fb_pad_aligned_buffer);
1da177e4 104
f1ab5dac
JS		 105void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
106 u32 shift_high, u32 shift_low, u32 mod)
1da177e4
LT		 107{
108 u8 mask = (u8) (0xfff << shift_high), tmp;
109 int i, j;
110
111 for (i = height; i--; ) {
112 for (j = 0; j < idx; j++) {
113 tmp = dst[j];
114 tmp &= mask;
115 tmp |= *src >> shift_low;
116 dst[j] = tmp;
117 tmp = *src << shift_high;
118 dst[j+1] = tmp;
119 src++;
120 }
121 tmp = dst[idx];
122 tmp &= mask;
123 tmp |= *src >> shift_low;
124 dst[idx] = tmp;
125 if (shift_high < mod) {
126 tmp = *src << shift_high;
127 dst[idx+1] = tmp;
128 }
129 src++;
130 dst += d_pitch;
131 }
132}
f1ab5dac 133EXPORT_SYMBOL(fb_pad_unaligned_buffer);
1da177e4
LT		 134
135/*
136 * we need to lock this section since fb_cursor
137 * may use fb_imageblit()
138 */
139char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
140{
141 u32 align = buf->buf_align - 1, offset;
142 char *addr = buf->addr;
143
144 /* If IO mapped, we need to sync before access, no sharing of
145 * the pixmap is done
146 */
147 if (buf->flags & FB_PIXMAP_IO) {
148 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
149 info->fbops->fb_sync(info);
150 return addr;
151 }
152
153 /* See if we fit in the remaining pixmap space */
154 offset = buf->offset + align;
155 offset &= ~align;
156 if (offset + size > buf->size) {
157 /* We do not fit. In order to be able to re-use the buffer,
158 * we must ensure no asynchronous DMA'ing or whatever operation
159 * is in progress, we sync for that.
160 */
161 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
162 info->fbops->fb_sync(info);
163 offset = 0;
164 }
165 buf->offset = offset + size;
166 addr += offset;
167
168 return addr;
169}
170
171#ifdef CONFIG_LOGO
172#include <linux/linux_logo.h>
173
174static inline unsigned safe_shift(unsigned d, int n)
175{
176 return n < 0 ? d >> -n : d << n;
177}
178
179static void fb_set_logocmap(struct fb_info *info,
180 const struct linux_logo *logo)
181{
182 struct fb_cmap palette_cmap;
183 u16 palette_green[16];
184 u16 palette_blue[16];
185 u16 palette_red[16];
186 int i, j, n;
187 const unsigned char *clut = logo->clut;
188
189 palette_cmap.start = 0;
190 palette_cmap.len = 16;
191 palette_cmap.red = palette_red;
192 palette_cmap.green = palette_green;
193 palette_cmap.blue = palette_blue;
194 palette_cmap.transp = NULL;
195
196 for (i = 0; i < logo->clutsize; i += n) {
197 n = logo->clutsize - i;
198 /* palette_cmap provides space for only 16 colors at once */
199 if (n > 16)
200 n = 16;
201 palette_cmap.start = 32 + i;
202 palette_cmap.len = n;
203 for (j = 0; j < n; ++j) {
204 palette_cmap.red[j] = clut[0] << 8 | clut[0];
205 palette_cmap.green[j] = clut[1] << 8 | clut[1];
206 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
207 clut += 3;
208 }
209 fb_set_cmap(&palette_cmap, info);
210 }
211}
212
213static void fb_set_logo_truepalette(struct fb_info *info,
214 const struct linux_logo *logo,
215 u32 *palette)
216{
217 unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
218 unsigned char redmask, greenmask, bluemask;
219 int redshift, greenshift, blueshift;
220 int i;
221 const unsigned char *clut = logo->clut;
222
223 /*
224 * We have to create a temporary palette since console palette is only
225 * 16 colors long.
226 */
227 /* Bug: Doesn't obey msb_right ... (who needs that?) */
228 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
229 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
230 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
231 redshift = info->var.red.offset - (8 - info->var.red.length);
232 greenshift = info->var.green.offset - (8 - info->var.green.length);
233 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
234
235 for ( i = 0; i < logo->clutsize; i++) {
236 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
237 safe_shift((clut[1] & greenmask), greenshift) |
238 safe_shift((clut[2] & bluemask), blueshift));
239 clut += 3;
240 }
241}
242
243static void fb_set_logo_directpalette(struct fb_info *info,
244 const struct linux_logo *logo,
245 u32 *palette)
246{
247 int redshift, greenshift, blueshift;
248 int i;
249
250 redshift = info->var.red.offset;
251 greenshift = info->var.green.offset;
252 blueshift = info->var.blue.offset;
253
254 for (i = 32; i < logo->clutsize; i++)
255 palette[i] = i << redshift | i << greenshift | i << blueshift;
256}
257
258static void fb_set_logo(struct fb_info *info,
259 const struct linux_logo *logo, u8 *dst,
260 int depth)
261{
b8c90945 262 int i, j, k;
1da177e4 263 const u8 *src = logo->data;
b8c90945
AD		 264 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
265 u8 fg = 1, d;
1da177e4 266
b8c90945 267 if (fb_get_color_depth(&info->var, &info->fix) == 3)
1da177e4
LT		 268 fg = 7;
269
b8c90945
AD		 270 if (info->fix.visual == FB_VISUAL_MONO01 ||
271 info->fix.visual == FB_VISUAL_MONO10)
272 fg = ~((u8) (0xfff << info->var.green.length));
273
1da177e4
LT		 274 switch (depth) {
275 case 4:
276 for (i = 0; i < logo->height; i++)
277 for (j = 0; j < logo->width; src++) {
278 *dst++ = *src >> 4;
279 j++;
280 if (j < logo->width) {
281 *dst++ = *src & 0x0f;
282 j++;
283 }
284 }
285 break;
286 case 1:
287 for (i = 0; i < logo->height; i++) {
288 for (j = 0; j < logo->width; src++) {
289 d = *src ^ xor;
290 for (k = 7; k >= 0; k--) {
291 *dst++ = ((d >> k) & 1) ? fg : 0;
292 j++;
293 }
294 }
295 }
296 break;
297 }
298}
299
300/*
301 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
302 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
303 * the visual format and color depth of the framebuffer, the DAC, the
304 * pseudo_palette, and the logo data will be adjusted accordingly.
305 *
306 * Case 1 - linux_logo_clut224:
307 * Color exceeds the number of console colors (16), thus we set the hardware DAC
308 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
309 *
310 * For visuals that require color info from the pseudo_palette, we also construct
311 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
312 * will be set.
313 *
314 * Case 2 - linux_logo_vga16:
315 * The number of colors just matches the console colors, thus there is no need
316 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
317 * each byte contains color information for two pixels (upper and lower nibble).
318 * To be consistent with fb_imageblit() usage, we therefore separate the two
319 * nibbles into separate bytes. The "depth" flag will be set to 4.
320 *
321 * Case 3 - linux_logo_mono:
322 * This is similar with Case 2. Each byte contains information for 8 pixels.
323 * We isolate each bit and expand each into a byte. The "depth" flag will
324 * be set to 1.
325 */
326static struct logo_data {
327 int depth;
328 int needs_directpalette;
329 int needs_truepalette;
330 int needs_cmapreset;
331 const struct linux_logo *logo;
332} fb_logo;
333
334int fb_prepare_logo(struct fb_info *info)
335{
b8c90945 336 int depth = fb_get_color_depth(&info->var, &info->fix);
1da177e4
LT		 337
338 memset(&fb_logo, 0, sizeof(struct logo_data));
339
340 if (info->flags & FBINFO_MISC_TILEBLITTING)
341 return 0;
342
343 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
344 depth = info->var.blue.length;
345 if (info->var.red.length < depth)
346 depth = info->var.red.length;
347 if (info->var.green.length < depth)
348 depth = info->var.green.length;
349 }
350
351 if (depth >= 8) {
352 switch (info->fix.visual) {
353 case FB_VISUAL_TRUECOLOR:
354 fb_logo.needs_truepalette = 1;
355 break;
356 case FB_VISUAL_DIRECTCOLOR:
357 fb_logo.needs_directpalette = 1;
358 fb_logo.needs_cmapreset = 1;
359 break;
360 case FB_VISUAL_PSEUDOCOLOR:
361 fb_logo.needs_cmapreset = 1;
362 break;
363 }
364 }
365
366 /* Return if no suitable logo was found */
367 fb_logo.logo = fb_find_logo(depth);
368
369 if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
370 fb_logo.logo = NULL;
371 return 0;
372 }
373 /* What depth we asked for might be different from what we get */
374 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
375 fb_logo.depth = 8;
376 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
377 fb_logo.depth = 4;
378 else
379 fb_logo.depth = 1;
380 return fb_logo.logo->height;
381}
382
383int fb_show_logo(struct fb_info *info)
384{
385 u32 *palette = NULL, *saved_pseudo_palette = NULL;
386 unsigned char *logo_new = NULL;
387 struct fb_image image;
388 int x;
389
390 /* Return if the frame buffer is not mapped or suspended */
391 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
392 return 0;
393
394 image.depth = 8;
395 image.data = fb_logo.logo->data;
396
397 if (fb_logo.needs_cmapreset)
398 fb_set_logocmap(info, fb_logo.logo);
399
400 if (fb_logo.needs_truepalette ||
401 fb_logo.needs_directpalette) {
402 palette = kmalloc(256 * 4, GFP_KERNEL);
403 if (palette == NULL)
404 return 0;
405
406 if (fb_logo.needs_truepalette)
407 fb_set_logo_truepalette(info, fb_logo.logo, palette);
408 else
409 fb_set_logo_directpalette(info, fb_logo.logo, palette);
410
411 saved_pseudo_palette = info->pseudo_palette;
412 info->pseudo_palette = palette;
413 }
414
415 if (fb_logo.depth <= 4) {
416 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
417 GFP_KERNEL);
418 if (logo_new == NULL) {
419 kfree(palette);
420 if (saved_pseudo_palette)
421 info->pseudo_palette = saved_pseudo_palette;
422 return 0;
423 }
424 image.data = logo_new;
425 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
426 }
427
428 image.width = fb_logo.logo->width;
429 image.height = fb_logo.logo->height;
430 image.dy = 0;
431
432 for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
433 x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
434 image.dx = x;
435 info->fbops->fb_imageblit(info, &image);
436 }
437
438 kfree(palette);
439 if (saved_pseudo_palette != NULL)
440 info->pseudo_palette = saved_pseudo_palette;
441 kfree(logo_new);
442 return fb_logo.logo->height;
443}
444#else
445int fb_prepare_logo(struct fb_info *info) { return 0; }
446int fb_show_logo(struct fb_info *info) { return 0; }
447#endif /* CONFIG_LOGO */
448
449static int fbmem_read_proc(char *buf, char **start, off_t offset,
450 int len, int *eof, void *private)
451{
452 struct fb_info **fi;
453 int clen;
454
455 clen = 0;
456 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
457 if (*fi)
458 clen += sprintf(buf + clen, "%d %s\n",
459 (*fi)->node,
460 (*fi)->fix.id);
461 *start = buf + offset;
462 if (clen > offset)
463 clen -= offset;
464 else
465 clen = 0;
466 return clen < len ? clen : len;
467}
468
469static ssize_t
470fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
471{
472 unsigned long p = *ppos;
473 struct inode *inode = file->f_dentry->d_inode;
474 int fbidx = iminor(inode);
475 struct fb_info *info = registered_fb[fbidx];
476 u32 *buffer, *dst;
477 u32 __iomem *src;
478 int c, i, cnt = 0, err = 0;
479 unsigned long total_size;
480
481 if (!info || ! info->screen_base)
482 return -ENODEV;
483
484 if (info->state != FBINFO_STATE_RUNNING)
485 return -EPERM;
486
487 if (info->fbops->fb_read)
488 return info->fbops->fb_read(file, buf, count, ppos);
489
490 total_size = info->screen_size;
491 if (total_size == 0)
492 total_size = info->fix.smem_len;
493
494 if (p >= total_size)
495 return 0;
496 if (count >= total_size)
497 count = total_size;
498 if (count + p > total_size)
499 count = total_size - p;
500
501 cnt = 0;
502 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
503 GFP_KERNEL);
504 if (!buffer)
505 return -ENOMEM;
506
507 src = (u32 __iomem *) (info->screen_base + p);
508
509 if (info->fbops->fb_sync)
510 info->fbops->fb_sync(info);
511
512 while (count) {
513 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
514 dst = buffer;
515 for (i = c >> 2; i--; )
516 *dst++ = fb_readl(src++);
517 if (c & 3) {
518 u8 *dst8 = (u8 *) dst;
519 u8 __iomem *src8 = (u8 __iomem *) src;
520
521 for (i = c & 3; i--;)
522 *dst8++ = fb_readb(src8++);
523
524 src = (u32 __iomem *) src8;
525 }
526
527 if (copy_to_user(buf, buffer, c)) {
528 err = -EFAULT;
529 break;
530 }
531 *ppos += c;
532 buf += c;
533 cnt += c;
534 count -= c;
535 }
536
537 kfree(buffer);
538 return (err) ? err : cnt;
539}
540
541static ssize_t
542fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
543{
544 unsigned long p = *ppos;
545 struct inode *inode = file->f_dentry->d_inode;
546 int fbidx = iminor(inode);
547 struct fb_info *info = registered_fb[fbidx];
548 u32 *buffer, *src;
549 u32 __iomem *dst;
550 int c, i, cnt = 0, err;
551 unsigned long total_size;
552
553 if (!info || !info->screen_base)
554 return -ENODEV;
555
556 if (info->state != FBINFO_STATE_RUNNING)
557 return -EPERM;
558
559 if (info->fbops->fb_write)
560 return info->fbops->fb_write(file, buf, count, ppos);
561
562 total_size = info->screen_size;
563 if (total_size == 0)
564 total_size = info->fix.smem_len;
565
566 if (p > total_size)
567 return -ENOSPC;
568 if (count >= total_size)
569 count = total_size;
570 err = 0;
571 if (count + p > total_size) {
572 count = total_size - p;
573 err = -ENOSPC;
574 }
575 cnt = 0;
576 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
577 GFP_KERNEL);
578 if (!buffer)
579 return -ENOMEM;
580
581 dst = (u32 __iomem *) (info->screen_base + p);
582
583 if (info->fbops->fb_sync)
584 info->fbops->fb_sync(info);
585
586 while (count) {
587 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
588 src = buffer;
589 if (copy_from_user(src, buf, c)) {
590 err = -EFAULT;
591 break;
592 }
593 for (i = c >> 2; i--; )
594 fb_writel(*src++, dst++);
595 if (c & 3) {
596 u8 *src8 = (u8 *) src;
597 u8 __iomem *dst8 = (u8 __iomem *) dst;
598
599 for (i = c & 3; i--; )
600 fb_writeb(*src8++, dst8++);
601
602 dst = (u32 __iomem *) dst8;
603 }
604 *ppos += c;
605 buf += c;
606 cnt += c;
607 count -= c;
608 }
609 kfree(buffer);
610
611 return (err) ? err : cnt;
612}
613
614#ifdef CONFIG_KMOD
615static void try_to_load(int fb)
616{
617 request_module("fb%d", fb);
618}
619#endif /* CONFIG_KMOD */
620
621int
622fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
623{
624 int xoffset = var->xoffset;
625 int yoffset = var->yoffset;
626 int err;
627
628 if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
629 xoffset + info->var.xres > info->var.xres_virtual ||
630 yoffset + info->var.yres > info->var.yres_virtual)
631 return -EINVAL;
632 if ((err = info->fbops->fb_pan_display(var, info)))
633 return err;
634 info->var.xoffset = var->xoffset;
635 info->var.yoffset = var->yoffset;
636 if (var->vmode & FB_VMODE_YWRAP)
637 info->var.vmode |= FB_VMODE_YWRAP;
638 else
639 info->var.vmode &= ~FB_VMODE_YWRAP;
640 return 0;
641}
642
643int
644fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
645{
3edea483 646 int err, flags = info->flags;
1da177e4
LT		 647
648 if (var->activate & FB_ACTIVATE_INV_MODE) {
649 struct fb_videomode mode1, mode2;
650 int ret = 0;
651
652 fb_var_to_videomode(&mode1, var);
653 fb_var_to_videomode(&mode2, &info->var);
654 /* make sure we don't delete the videomode of current var */
655 ret = fb_mode_is_equal(&mode1, &mode2);
656
657 if (!ret) {
658 struct fb_event event;
659
660 event.info = info;
661 event.data = &mode1;
662 ret = notifier_call_chain(&fb_notifier_list,
663 FB_EVENT_MODE_DELETE, &event);
664 }
665
666 if (!ret)
667 fb_delete_videomode(&mode1, &info->modelist);
668
669 return ret;
670 }
671
672 if ((var->activate & FB_ACTIVATE_FORCE) ||
673 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
674 if (!info->fbops->fb_check_var) {
675 *var = info->var;
676 return 0;
677 }
678
679 if ((err = info->fbops->fb_check_var(var, info)))
680 return err;
681
682 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
683 struct fb_videomode mode;
684 int err = 0;
685
686 info->var = *var;
687 if (info->fbops->fb_set_par)
688 info->fbops->fb_set_par(info);
689
690 fb_pan_display(info, &info->var);
691
692 fb_set_cmap(&info->cmap, info);
693
694 fb_var_to_videomode(&mode, &info->var);
695
696 if (info->modelist.prev && info->modelist.next &&
697 !list_empty(&info->modelist))
698 err = fb_add_videomode(&mode, &info->modelist);
699
3edea483 700 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
1da177e4 701 struct fb_event event;
7726e9e1
AD		 702 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
703 FB_EVENT_MODE_CHANGE_ALL :
704 FB_EVENT_MODE_CHANGE;
1da177e4
LT		 705
706 info->flags &= ~FBINFO_MISC_USEREVENT;
707 event.info = info;
7726e9e1 708 notifier_call_chain(&fb_notifier_list, evnt,
1da177e4
LT		 709 &event);
710 }
711 }
712 }
713 return 0;
714}
715
716int
717fb_blank(struct fb_info *info, int blank)
718{
719 int ret = -EINVAL;
720
721 if (blank > FB_BLANK_POWERDOWN)
722 blank = FB_BLANK_POWERDOWN;
723
724 if (info->fbops->fb_blank)
725 ret = info->fbops->fb_blank(blank, info);
726
727 if (!ret) {
728 struct fb_event event;
729
730 event.info = info;
731 event.data = &blank;
732 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
733 }
734
735 return ret;
736}
737
738static int
739fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
740 unsigned long arg)
741{
742 int fbidx = iminor(inode);
743 struct fb_info *info = registered_fb[fbidx];
744 struct fb_ops *fb = info->fbops;
745 struct fb_var_screeninfo var;
746 struct fb_fix_screeninfo fix;
747 struct fb_con2fbmap con2fb;
748 struct fb_cmap_user cmap;
749 struct fb_event event;
750 void __user *argp = (void __user *)arg;
751 int i;
752
753 if (!fb)
754 return -ENODEV;
755 switch (cmd) {
756 case FBIOGET_VSCREENINFO:
757 return copy_to_user(argp, &info->var,
758 sizeof(var)) ? -EFAULT : 0;
759 case FBIOPUT_VSCREENINFO:
760 if (copy_from_user(&var, argp, sizeof(var)))
761 return -EFAULT;
762 acquire_console_sem();
763 info->flags |= FBINFO_MISC_USEREVENT;
764 i = fb_set_var(info, &var);
765 info->flags &= ~FBINFO_MISC_USEREVENT;
766 release_console_sem();
767 if (i) return i;
768 if (copy_to_user(argp, &var, sizeof(var)))
769 return -EFAULT;
770 return 0;
771 case FBIOGET_FSCREENINFO:
772 return copy_to_user(argp, &info->fix,
773 sizeof(fix)) ? -EFAULT : 0;
774 case FBIOPUTCMAP:
775 if (copy_from_user(&cmap, argp, sizeof(cmap)))
776 return -EFAULT;
777 return (fb_set_user_cmap(&cmap, info));
778 case FBIOGETCMAP:
779 if (copy_from_user(&cmap, argp, sizeof(cmap)))
780 return -EFAULT;
781 return fb_cmap_to_user(&info->cmap, &cmap);
782 case FBIOPAN_DISPLAY:
783 if (copy_from_user(&var, argp, sizeof(var)))
784 return -EFAULT;
785 acquire_console_sem();
786 i = fb_pan_display(info, &var);
787 release_console_sem();
788 if (i)
789 return i;
790 if (copy_to_user(argp, &var, sizeof(var)))
791 return -EFAULT;
792 return 0;
793 case FBIO_CURSOR:
794 return -EINVAL;
795 case FBIOGET_CON2FBMAP:
796 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
797 return -EFAULT;
798 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
799 return -EINVAL;
800 con2fb.framebuffer = -1;
801 event.info = info;
802 event.data = &con2fb;
803 notifier_call_chain(&fb_notifier_list,
804 FB_EVENT_GET_CONSOLE_MAP, &event);
805 return copy_to_user(argp, &con2fb,
806 sizeof(con2fb)) ? -EFAULT : 0;
807 case FBIOPUT_CON2FBMAP:
808 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
809 return - EFAULT;
810 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
811 return -EINVAL;
812 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
813 return -EINVAL;
814#ifdef CONFIG_KMOD
815 if (!registered_fb[con2fb.framebuffer])
816 try_to_load(con2fb.framebuffer);
817#endif /* CONFIG_KMOD */
818 if (!registered_fb[con2fb.framebuffer])
819 return -EINVAL;
820 event.info = info;
821 event.data = &con2fb;
822 return notifier_call_chain(&fb_notifier_list,
823 FB_EVENT_SET_CONSOLE_MAP,
824 &event);
825 case FBIOBLANK:
826 acquire_console_sem();
827 info->flags |= FBINFO_MISC_USEREVENT;
828 i = fb_blank(info, arg);
829 info->flags &= ~FBINFO_MISC_USEREVENT;
830 release_console_sem();
831 return i;
832 default:
833 if (fb->fb_ioctl == NULL)
834 return -EINVAL;
835 return fb->fb_ioctl(inode, file, cmd, arg, info);
836 }
837}
838
839#ifdef CONFIG_COMPAT
840static long
841fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
842{
843 int fbidx = iminor(file->f_dentry->d_inode);
844 struct fb_info *info = registered_fb[fbidx];
845 struct fb_ops *fb = info->fbops;
846 long ret;
847
848 if (fb->fb_compat_ioctl == NULL)
849 return -ENOIOCTLCMD;
850 lock_kernel();
851 ret = fb->fb_compat_ioctl(file, cmd, arg, info);
852 unlock_kernel();
853 return ret;
854}
855#endif
856
857static int
858fb_mmap(struct file *file, struct vm_area_struct * vma)
859{
860 int fbidx = iminor(file->f_dentry->d_inode);
861 struct fb_info *info = registered_fb[fbidx];
862 struct fb_ops *fb = info->fbops;
863 unsigned long off;
864#if !defined(__sparc__) || defined(__sparc_v9__)
865 unsigned long start;
866 u32 len;
867#endif
868
869 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
870 return -EINVAL;
871 off = vma->vm_pgoff << PAGE_SHIFT;
872 if (!fb)
873 return -ENODEV;
874 if (fb->fb_mmap) {
875 int res;
876 lock_kernel();
877 res = fb->fb_mmap(info, file, vma);
878 unlock_kernel();
879 return res;
880 }
881
882#if defined(__sparc__) && !defined(__sparc_v9__)
883 /* Should never get here, all fb drivers should have their own
884 mmap routines */
885 return -EINVAL;
886#else
887 /* !sparc32... */
888 lock_kernel();
889
890 /* frame buffer memory */
891 start = info->fix.smem_start;
892 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
893 if (off >= len) {
894 /* memory mapped io */
895 off -= len;
896 if (info->var.accel_flags) {
897 unlock_kernel();
898 return -EINVAL;
899 }
900 start = info->fix.mmio_start;
901 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
902 }
903 unlock_kernel();
904 start &= PAGE_MASK;
905 if ((vma->vm_end - vma->vm_start + off) > len)
906 return -EINVAL;
907 off += start;
908 vma->vm_pgoff = off >> PAGE_SHIFT;
909 /* This is an IO map - tell maydump to skip this VMA */
910 vma->vm_flags |= VM_IO | VM_RESERVED;
911#if defined(__sparc_v9__)
912 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
913 vma->vm_end - vma->vm_start, vma->vm_page_prot))
914 return -EAGAIN;
915#else
916#if defined(__mc68000__)
917#if defined(CONFIG_SUN3)
918 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
919#elif defined(CONFIG_MMU)
920 if (CPU_IS_020_OR_030)
921 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
922 if (CPU_IS_040_OR_060) {
923 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
924 /* Use no-cache mode, serialized */
925 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
926 }
927#endif
928#elif defined(__powerpc__)
929 vma->vm_page_prot = phys_mem_access_prot(file, off,
930 vma->vm_end - vma->vm_start,
931 vma->vm_page_prot);
932#elif defined(__alpha__)
933 /* Caching is off in the I/O space quadrant by design. */
934#elif defined(__i386__) || defined(__x86_64__)
935 if (boot_cpu_data.x86 > 3)
936 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
937#elif defined(__mips__)
938 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
939#elif defined(__hppa__)
940 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
941#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
942 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
943#elif defined(__ia64__)
944 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
945 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
946 else
947 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
948#else
949#warning What do we have to do here??
950#endif
951 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
952 vma->vm_end - vma->vm_start, vma->vm_page_prot))
953 return -EAGAIN;
954#endif /* !__sparc_v9__ */
955 return 0;
956#endif /* !sparc32 */
957}
958
959static int
960fb_open(struct inode *inode, struct file *file)
961{
962 int fbidx = iminor(inode);
963 struct fb_info *info;
964 int res = 0;
965
966 if (fbidx >= FB_MAX)
967 return -ENODEV;
968#ifdef CONFIG_KMOD
969 if (!(info = registered_fb[fbidx]))
970 try_to_load(fbidx);
971#endif /* CONFIG_KMOD */
972 if (!(info = registered_fb[fbidx]))
973 return -ENODEV;
974 if (!try_module_get(info->fbops->owner))
975 return -ENODEV;
976 if (info->fbops->fb_open) {
977 res = info->fbops->fb_open(info,1);
978 if (res)
979 module_put(info->fbops->owner);
980 }
981 return res;
982}
983
984static int
985fb_release(struct inode *inode, struct file *file)
986{
987 int fbidx = iminor(inode);
988 struct fb_info *info;
989
990 lock_kernel();
991 info = registered_fb[fbidx];
992 if (info->fbops->fb_release)
993 info->fbops->fb_release(info,1);
994 module_put(info->fbops->owner);
995 unlock_kernel();
996 return 0;
997}
998
999static struct file_operations fb_fops = {
1000 .owner = THIS_MODULE,
1001 .read = fb_read,
1002 .write = fb_write,
1003 .ioctl = fb_ioctl,
1004#ifdef CONFIG_COMPAT
1005 .compat_ioctl = fb_compat_ioctl,
1006#endif
1007 .mmap = fb_mmap,
1008 .open = fb_open,
1009 .release = fb_release,
1010#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1011 .get_unmapped_area = get_fb_unmapped_area,
1012#endif
1013};
1014
56b22935 1015static struct class *fb_class;
1da177e4
LT		 1016
1017/**
1018 * register_framebuffer - registers a frame buffer device
1019 * @fb_info: frame buffer info structure
1020 *
1021 * Registers a frame buffer device @fb_info.
1022 *
1023 * Returns negative errno on error, or zero for success.
1024 *
1025 */
1026
1027int
1028register_framebuffer(struct fb_info *fb_info)
1029{
1030 int i;
1031 struct fb_event event;
1032
1033 if (num_registered_fb == FB_MAX)
1034 return -ENXIO;
1035 num_registered_fb++;
1036 for (i = 0 ; i < FB_MAX; i++)
1037 if (!registered_fb[i])
1038 break;
1039 fb_info->node = i;
1040
56b22935 1041 fb_info->class_device = class_device_create(fb_class, MKDEV(FB_MAJOR, i),
1da177e4
LT		 1042 fb_info->device, "fb%d", i);
1043 if (IS_ERR(fb_info->class_device)) {
1044 /* Not fatal */
1045 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1046 fb_info->class_device = NULL;
1047 } else
1048 fb_init_class_device(fb_info);
1049
1050 if (fb_info->pixmap.addr == NULL) {
1051 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1052 if (fb_info->pixmap.addr) {
1053 fb_info->pixmap.size = FBPIXMAPSIZE;
1054 fb_info->pixmap.buf_align = 1;
1055 fb_info->pixmap.scan_align = 1;
58a60643 1056 fb_info->pixmap.access_align = 32;
1da177e4
LT		 1057 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1058 }
1059 }
1060 fb_info->pixmap.offset = 0;
1061
1062 if (!fb_info->modelist.prev ||
1063 !fb_info->modelist.next ||
1064 list_empty(&fb_info->modelist)) {
1065 struct fb_videomode mode;
1066
1067 INIT_LIST_HEAD(&fb_info->modelist);
1068 fb_var_to_videomode(&mode, &fb_info->var);
1069 fb_add_videomode(&mode, &fb_info->modelist);
1070 }
1071
1072 registered_fb[i] = fb_info;
1073
1074 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1075 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1076 event.info = fb_info;
1077 notifier_call_chain(&fb_notifier_list,
1078 FB_EVENT_FB_REGISTERED, &event);
1079 return 0;
1080}
1081
1082
1083/**
1084 * unregister_framebuffer - releases a frame buffer device
1085 * @fb_info: frame buffer info structure
1086 *
1087 * Unregisters a frame buffer device @fb_info.
1088 *
1089 * Returns negative errno on error, or zero for success.
1090 *
1091 */
1092
1093int
1094unregister_framebuffer(struct fb_info *fb_info)
1095{
1096 int i;
1097
1098 i = fb_info->node;
1099 if (!registered_fb[i])
1100 return -EINVAL;
1101 devfs_remove("fb/%d", i);
1102
1103 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1104 kfree(fb_info->pixmap.addr);
1105 fb_destroy_modelist(&fb_info->modelist);
1106 registered_fb[i]=NULL;
1107 num_registered_fb--;
1108 fb_cleanup_class_device(fb_info);
56b22935 1109 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1da177e4
LT		 1110 return 0;
1111}
1112
1113/**
1114 * fb_register_client - register a client notifier
1115 * @nb: notifier block to callback on events
1116 */
1117int fb_register_client(struct notifier_block *nb)
1118{
1119 return notifier_chain_register(&fb_notifier_list, nb);
1120}
1121
1122/**
1123 * fb_unregister_client - unregister a client notifier
1124 * @nb: notifier block to callback on events
1125 */
1126int fb_unregister_client(struct notifier_block *nb)
1127{
1128 return notifier_chain_unregister(&fb_notifier_list, nb);
1129}
1130
1131/**
1132 * fb_set_suspend - low level driver signals suspend
1133 * @info: framebuffer affected
1134 * @state: 0 = resuming, !=0 = suspending
1135 *
1136 * This is meant to be used by low level drivers to
1137 * signal suspend/resume to the core & clients.
1138 * It must be called with the console semaphore held
1139 */
1140void fb_set_suspend(struct fb_info *info, int state)
1141{
1142 struct fb_event event;
1143
1144 event.info = info;
1145 if (state) {
1146 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1147 info->state = FBINFO_STATE_SUSPENDED;
1148 } else {
1149 info->state = FBINFO_STATE_RUNNING;
1150 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1151 }
1152}
1153
1154/**
1155 * fbmem_init - init frame buffer subsystem
1156 *
1157 * Initialize the frame buffer subsystem.
1158 *
1159 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1160 *
1161 */
1162
1163static int __init
1164fbmem_init(void)
1165{
1166 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1167
1168 devfs_mk_dir("fb");
1169 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1170 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1171
56b22935 1172 fb_class = class_create(THIS_MODULE, "graphics");
1da177e4
LT		 1173 if (IS_ERR(fb_class)) {
1174 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1175 fb_class = NULL;
1176 }
1177 return 0;
1178}
1179
1180#ifdef MODULE
1181module_init(fbmem_init);
1182static void __exit
1183fbmem_exit(void)
1184{
56b22935 1185 class_destroy(fb_class);
5a340cce 1186 unregister_chrdev(FB_MAJOR, "fb");
1da177e4
LT		 1187}
1188
1189module_exit(fbmem_exit);
1190MODULE_LICENSE("GPL");
1191MODULE_DESCRIPTION("Framebuffer base");
1192#else
1193subsys_initcall(fbmem_init);
1194#endif
1195
1196int fb_new_modelist(struct fb_info *info)
1197{
1198 struct fb_event event;
1199 struct fb_var_screeninfo var = info->var;
1200 struct list_head *pos, *n;
1201 struct fb_modelist *modelist;
1202 struct fb_videomode *m, mode;
1203 int err = 1;
1204
1205 list_for_each_safe(pos, n, &info->modelist) {
1206 modelist = list_entry(pos, struct fb_modelist, list);
1207 m = &modelist->mode;
1208 fb_videomode_to_var(&var, m);
1209 var.activate = FB_ACTIVATE_TEST;
1210 err = fb_set_var(info, &var);
1211 fb_var_to_videomode(&mode, &var);
1212 if (err || !fb_mode_is_equal(m, &mode)) {
1213 list_del(pos);
1214 kfree(pos);
1215 }
1216 }
1217
1218 err = 1;
1219
1220 if (!list_empty(&info->modelist)) {
1221 event.info = info;
1222 err = notifier_call_chain(&fb_notifier_list,
1223 FB_EVENT_NEW_MODELIST,
1224 &event);
1225 }
1226
1227 return err;
1228}
1229
1230static char *video_options[FB_MAX];
1231static int ofonly;
1232
4dc3b16b
PP		 1233extern const char *global_mode_option;
1234
1da177e4
LT		 1235/**
1236 * fb_get_options - get kernel boot parameters
1237 * @name: framebuffer name as it would appear in
1238 * the boot parameter line
1239 * (video=<name>:<options>)
1240 * @option: the option will be stored here
1241 *
1242 * NOTE: Needed to maintain backwards compatibility
1243 */
1244int fb_get_options(char *name, char **option)
1245{
1246 char *opt, *options = NULL;
1247 int opt_len, retval = 0;
1248 int name_len = strlen(name), i;
1249
1250 if (name_len && ofonly && strncmp(name, "offb", 4))
1251 retval = 1;
1252
1253 if (name_len && !retval) {
1254 for (i = 0; i < FB_MAX; i++) {
1255 if (video_options[i] == NULL)
1256 continue;
1257 opt_len = strlen(video_options[i]);
1258 if (!opt_len)
1259 continue;
1260 opt = video_options[i];
1261 if (!strncmp(name, opt, name_len) &&
1262 opt[name_len] == ':')
1263 options = opt + name_len + 1;
1264 }
1265 }
1266 if (options && !strncmp(options, "off", 3))
1267 retval = 1;
1268
1269 if (option)
1270 *option = options;
1271
1272 return retval;
1273}
1274
1da177e4
LT		 1275/**
1276 * video_setup - process command line options
1277 * @options: string of options
1278 *
1279 * Process command line options for frame buffer subsystem.
1280 *
1281 * NOTE: This function is a __setup and __init function.
1282 * It only stores the options. Drivers have to call
1283 * fb_get_options() as necessary.
1284 *
1285 * Returns zero.
1286 *
1287 */
75c96f85 1288static int __init video_setup(char *options)
1da177e4
LT		 1289{
1290 int i, global = 0;
1291
1292 if (!options || !*options)
1293 global = 1;
1294
1295 if (!global && !strncmp(options, "ofonly", 6)) {
1296 ofonly = 1;
1297 global = 1;
1298 }
1299
1300 if (!global && !strstr(options, "fb:")) {
1301 global_mode_option = options;
1302 global = 1;
1303 }
1304
1305 if (!global) {
1306 for (i = 0; i < FB_MAX; i++) {
1307 if (video_options[i] == NULL) {
1308 video_options[i] = options;
1309 break;
1310 }
1311
1312 }
1313 }
1314
1315 return 0;
1316}
1317__setup("video=", video_setup);
1318
1319 /*
1320 * Visible symbols for modules
1321 */
1322
1323EXPORT_SYMBOL(register_framebuffer);
1324EXPORT_SYMBOL(unregister_framebuffer);
1325EXPORT_SYMBOL(num_registered_fb);
1326EXPORT_SYMBOL(registered_fb);
1327EXPORT_SYMBOL(fb_prepare_logo);
1328EXPORT_SYMBOL(fb_show_logo);
1329EXPORT_SYMBOL(fb_set_var);
1330EXPORT_SYMBOL(fb_blank);
1331EXPORT_SYMBOL(fb_pan_display);
1332EXPORT_SYMBOL(fb_get_buffer_offset);
1da177e4
LT		 1333EXPORT_SYMBOL(fb_set_suspend);
1334EXPORT_SYMBOL(fb_register_client);
1335EXPORT_SYMBOL(fb_unregister_client);
1336EXPORT_SYMBOL(fb_get_options);
1337EXPORT_SYMBOL(fb_new_modelist);
1338
1339MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)