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