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[PATCH] fbcon: Console Rotation - Prepare fbcon for console rotation
[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
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{
829e79b6 93 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
1da177e4 94}
f1ab5dac 95EXPORT_SYMBOL(fb_pad_aligned_buffer);
1da177e4 96
f1ab5dac
JS		 97void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
98 u32 shift_high, u32 shift_low, u32 mod)
1da177e4
LT		 99{
100 u8 mask = (u8) (0xfff << shift_high), tmp;
101 int i, j;
102
103 for (i = height; i--; ) {
104 for (j = 0; j < idx; j++) {
105 tmp = dst[j];
106 tmp &= mask;
107 tmp |= *src >> shift_low;
108 dst[j] = tmp;
109 tmp = *src << shift_high;
110 dst[j+1] = tmp;
111 src++;
112 }
113 tmp = dst[idx];
114 tmp &= mask;
115 tmp |= *src >> shift_low;
116 dst[idx] = tmp;
117 if (shift_high < mod) {
118 tmp = *src << shift_high;
119 dst[idx+1] = tmp;
120 }
121 src++;
122 dst += d_pitch;
123 }
124}
f1ab5dac 125EXPORT_SYMBOL(fb_pad_unaligned_buffer);
1da177e4
LT		 126
127/*
128 * we need to lock this section since fb_cursor
129 * may use fb_imageblit()
130 */
131char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
132{
133 u32 align = buf->buf_align - 1, offset;
134 char *addr = buf->addr;
135
136 /* If IO mapped, we need to sync before access, no sharing of
137 * the pixmap is done
138 */
139 if (buf->flags & FB_PIXMAP_IO) {
140 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
141 info->fbops->fb_sync(info);
142 return addr;
143 }
144
145 /* See if we fit in the remaining pixmap space */
146 offset = buf->offset + align;
147 offset &= ~align;
148 if (offset + size > buf->size) {
149 /* We do not fit. In order to be able to re-use the buffer,
150 * we must ensure no asynchronous DMA'ing or whatever operation
151 * is in progress, we sync for that.
152 */
153 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
154 info->fbops->fb_sync(info);
155 offset = 0;
156 }
157 buf->offset = offset + size;
158 addr += offset;
159
160 return addr;
161}
162
163#ifdef CONFIG_LOGO
164#include <linux/linux_logo.h>
165
166static inline unsigned safe_shift(unsigned d, int n)
167{
168 return n < 0 ? d >> -n : d << n;
169}
170
171static void fb_set_logocmap(struct fb_info *info,
172 const struct linux_logo *logo)
173{
174 struct fb_cmap palette_cmap;
175 u16 palette_green[16];
176 u16 palette_blue[16];
177 u16 palette_red[16];
178 int i, j, n;
179 const unsigned char *clut = logo->clut;
180
181 palette_cmap.start = 0;
182 palette_cmap.len = 16;
183 palette_cmap.red = palette_red;
184 palette_cmap.green = palette_green;
185 palette_cmap.blue = palette_blue;
186 palette_cmap.transp = NULL;
187
188 for (i = 0; i < logo->clutsize; i += n) {
189 n = logo->clutsize - i;
190 /* palette_cmap provides space for only 16 colors at once */
191 if (n > 16)
192 n = 16;
193 palette_cmap.start = 32 + i;
194 palette_cmap.len = n;
195 for (j = 0; j < n; ++j) {
196 palette_cmap.red[j] = clut[0] << 8 | clut[0];
197 palette_cmap.green[j] = clut[1] << 8 | clut[1];
198 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
199 clut += 3;
200 }
201 fb_set_cmap(&palette_cmap, info);
202 }
203}
204
205static void fb_set_logo_truepalette(struct fb_info *info,
206 const struct linux_logo *logo,
207 u32 *palette)
208{
209 unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
210 unsigned char redmask, greenmask, bluemask;
211 int redshift, greenshift, blueshift;
212 int i;
213 const unsigned char *clut = logo->clut;
214
215 /*
216 * We have to create a temporary palette since console palette is only
217 * 16 colors long.
218 */
219 /* Bug: Doesn't obey msb_right ... (who needs that?) */
220 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
221 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
222 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
223 redshift = info->var.red.offset - (8 - info->var.red.length);
224 greenshift = info->var.green.offset - (8 - info->var.green.length);
225 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
226
227 for ( i = 0; i < logo->clutsize; i++) {
228 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
229 safe_shift((clut[1] & greenmask), greenshift) |
230 safe_shift((clut[2] & bluemask), blueshift));
231 clut += 3;
232 }
233}
234
235static void fb_set_logo_directpalette(struct fb_info *info,
236 const struct linux_logo *logo,
237 u32 *palette)
238{
239 int redshift, greenshift, blueshift;
240 int i;
241
242 redshift = info->var.red.offset;
243 greenshift = info->var.green.offset;
244 blueshift = info->var.blue.offset;
245
246 for (i = 32; i < logo->clutsize; i++)
247 palette[i] = i << redshift | i << greenshift | i << blueshift;
248}
249
250static void fb_set_logo(struct fb_info *info,
251 const struct linux_logo *logo, u8 *dst,
252 int depth)
253{
b8c90945 254 int i, j, k;
1da177e4 255 const u8 *src = logo->data;
b8c90945
AD		 256 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
257 u8 fg = 1, d;
1da177e4 258
b8c90945 259 if (fb_get_color_depth(&info->var, &info->fix) == 3)
1da177e4
LT		 260 fg = 7;
261
b8c90945
AD		 262 if (info->fix.visual == FB_VISUAL_MONO01 ||
263 info->fix.visual == FB_VISUAL_MONO10)
264 fg = ~((u8) (0xfff << info->var.green.length));
265
1da177e4
LT		 266 switch (depth) {
267 case 4:
268 for (i = 0; i < logo->height; i++)
269 for (j = 0; j < logo->width; src++) {
270 *dst++ = *src >> 4;
271 j++;
272 if (j < logo->width) {
273 *dst++ = *src & 0x0f;
274 j++;
275 }
276 }
277 break;
278 case 1:
279 for (i = 0; i < logo->height; i++) {
280 for (j = 0; j < logo->width; src++) {
281 d = *src ^ xor;
282 for (k = 7; k >= 0; k--) {
283 *dst++ = ((d >> k) & 1) ? fg : 0;
284 j++;
285 }
286 }
287 }
288 break;
289 }
290}
291
292/*
293 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
294 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
295 * the visual format and color depth of the framebuffer, the DAC, the
296 * pseudo_palette, and the logo data will be adjusted accordingly.
297 *
298 * Case 1 - linux_logo_clut224:
299 * Color exceeds the number of console colors (16), thus we set the hardware DAC
300 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
301 *
302 * For visuals that require color info from the pseudo_palette, we also construct
303 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
304 * will be set.
305 *
306 * Case 2 - linux_logo_vga16:
307 * The number of colors just matches the console colors, thus there is no need
308 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
309 * each byte contains color information for two pixels (upper and lower nibble).
310 * To be consistent with fb_imageblit() usage, we therefore separate the two
311 * nibbles into separate bytes. The "depth" flag will be set to 4.
312 *
313 * Case 3 - linux_logo_mono:
314 * This is similar with Case 2. Each byte contains information for 8 pixels.
315 * We isolate each bit and expand each into a byte. The "depth" flag will
316 * be set to 1.
317 */
318static struct logo_data {
319 int depth;
320 int needs_directpalette;
321 int needs_truepalette;
322 int needs_cmapreset;
323 const struct linux_logo *logo;
324} fb_logo;
325
326int fb_prepare_logo(struct fb_info *info)
327{
b8c90945 328 int depth = fb_get_color_depth(&info->var, &info->fix);
1da177e4
LT		 329
330 memset(&fb_logo, 0, sizeof(struct logo_data));
331
332 if (info->flags & FBINFO_MISC_TILEBLITTING)
333 return 0;
334
335 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
336 depth = info->var.blue.length;
337 if (info->var.red.length < depth)
338 depth = info->var.red.length;
339 if (info->var.green.length < depth)
340 depth = info->var.green.length;
341 }
342
343 if (depth >= 8) {
344 switch (info->fix.visual) {
345 case FB_VISUAL_TRUECOLOR:
346 fb_logo.needs_truepalette = 1;
347 break;
348 case FB_VISUAL_DIRECTCOLOR:
349 fb_logo.needs_directpalette = 1;
350 fb_logo.needs_cmapreset = 1;
351 break;
352 case FB_VISUAL_PSEUDOCOLOR:
353 fb_logo.needs_cmapreset = 1;
354 break;
355 }
356 }
357
358 /* Return if no suitable logo was found */
359 fb_logo.logo = fb_find_logo(depth);
360
361 if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
362 fb_logo.logo = NULL;
363 return 0;
364 }
365 /* What depth we asked for might be different from what we get */
366 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
367 fb_logo.depth = 8;
368 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
369 fb_logo.depth = 4;
370 else
371 fb_logo.depth = 1;
372 return fb_logo.logo->height;
373}
374
375int fb_show_logo(struct fb_info *info)
376{
377 u32 *palette = NULL, *saved_pseudo_palette = NULL;
378 unsigned char *logo_new = NULL;
379 struct fb_image image;
380 int x;
381
382 /* Return if the frame buffer is not mapped or suspended */
383 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
384 return 0;
385
386 image.depth = 8;
387 image.data = fb_logo.logo->data;
388
389 if (fb_logo.needs_cmapreset)
390 fb_set_logocmap(info, fb_logo.logo);
391
392 if (fb_logo.needs_truepalette ||
393 fb_logo.needs_directpalette) {
394 palette = kmalloc(256 * 4, GFP_KERNEL);
395 if (palette == NULL)
396 return 0;
397
398 if (fb_logo.needs_truepalette)
399 fb_set_logo_truepalette(info, fb_logo.logo, palette);
400 else
401 fb_set_logo_directpalette(info, fb_logo.logo, palette);
402
403 saved_pseudo_palette = info->pseudo_palette;
404 info->pseudo_palette = palette;
405 }
406
407 if (fb_logo.depth <= 4) {
408 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
409 GFP_KERNEL);
410 if (logo_new == NULL) {
411 kfree(palette);
412 if (saved_pseudo_palette)
413 info->pseudo_palette = saved_pseudo_palette;
414 return 0;
415 }
416 image.data = logo_new;
417 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
418 }
419
420 image.width = fb_logo.logo->width;
421 image.height = fb_logo.logo->height;
422 image.dy = 0;
423
424 for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
425 x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
426 image.dx = x;
427 info->fbops->fb_imageblit(info, &image);
428 }
429
430 kfree(palette);
431 if (saved_pseudo_palette != NULL)
432 info->pseudo_palette = saved_pseudo_palette;
433 kfree(logo_new);
434 return fb_logo.logo->height;
435}
436#else
437int fb_prepare_logo(struct fb_info *info) { return 0; }
438int fb_show_logo(struct fb_info *info) { return 0; }
439#endif /* CONFIG_LOGO */
440
441static int fbmem_read_proc(char *buf, char **start, off_t offset,
442 int len, int *eof, void *private)
443{
444 struct fb_info **fi;
445 int clen;
446
447 clen = 0;
448 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
449 if (*fi)
450 clen += sprintf(buf + clen, "%d %s\n",
451 (*fi)->node,
452 (*fi)->fix.id);
453 *start = buf + offset;
454 if (clen > offset)
455 clen -= offset;
456 else
457 clen = 0;
458 return clen < len ? clen : len;
459}
460
461static ssize_t
462fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
463{
464 unsigned long p = *ppos;
465 struct inode *inode = file->f_dentry->d_inode;
466 int fbidx = iminor(inode);
467 struct fb_info *info = registered_fb[fbidx];
468 u32 *buffer, *dst;
469 u32 __iomem *src;
470 int c, i, cnt = 0, err = 0;
471 unsigned long total_size;
472
473 if (!info || ! info->screen_base)
474 return -ENODEV;
475
476 if (info->state != FBINFO_STATE_RUNNING)
477 return -EPERM;
478
479 if (info->fbops->fb_read)
480 return info->fbops->fb_read(file, buf, count, ppos);
481
482 total_size = info->screen_size;
483 if (total_size == 0)
484 total_size = info->fix.smem_len;
485
486 if (p >= total_size)
487 return 0;
488 if (count >= total_size)
489 count = total_size;
490 if (count + p > total_size)
491 count = total_size - p;
492
493 cnt = 0;
494 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
495 GFP_KERNEL);
496 if (!buffer)
497 return -ENOMEM;
498
499 src = (u32 __iomem *) (info->screen_base + p);
500
501 if (info->fbops->fb_sync)
502 info->fbops->fb_sync(info);
503
504 while (count) {
505 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
506 dst = buffer;
507 for (i = c >> 2; i--; )
508 *dst++ = fb_readl(src++);
509 if (c & 3) {
510 u8 *dst8 = (u8 *) dst;
511 u8 __iomem *src8 = (u8 __iomem *) src;
512
513 for (i = c & 3; i--;)
514 *dst8++ = fb_readb(src8++);
515
516 src = (u32 __iomem *) src8;
517 }
518
519 if (copy_to_user(buf, buffer, c)) {
520 err = -EFAULT;
521 break;
522 }
523 *ppos += c;
524 buf += c;
525 cnt += c;
526 count -= c;
527 }
528
529 kfree(buffer);
530 return (err) ? err : cnt;
531}
532
533static ssize_t
534fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
535{
536 unsigned long p = *ppos;
537 struct inode *inode = file->f_dentry->d_inode;
538 int fbidx = iminor(inode);
539 struct fb_info *info = registered_fb[fbidx];
540 u32 *buffer, *src;
541 u32 __iomem *dst;
542 int c, i, cnt = 0, err;
543 unsigned long total_size;
544
545 if (!info || !info->screen_base)
546 return -ENODEV;
547
548 if (info->state != FBINFO_STATE_RUNNING)
549 return -EPERM;
550
551 if (info->fbops->fb_write)
552 return info->fbops->fb_write(file, buf, count, ppos);
553
554 total_size = info->screen_size;
555 if (total_size == 0)
556 total_size = info->fix.smem_len;
557
558 if (p > total_size)
559 return -ENOSPC;
560 if (count >= total_size)
561 count = total_size;
562 err = 0;
563 if (count + p > total_size) {
564 count = total_size - p;
565 err = -ENOSPC;
566 }
567 cnt = 0;
568 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
569 GFP_KERNEL);
570 if (!buffer)
571 return -ENOMEM;
572
573 dst = (u32 __iomem *) (info->screen_base + p);
574
575 if (info->fbops->fb_sync)
576 info->fbops->fb_sync(info);
577
578 while (count) {
579 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
580 src = buffer;
581 if (copy_from_user(src, buf, c)) {
582 err = -EFAULT;
583 break;
584 }
585 for (i = c >> 2; i--; )
586 fb_writel(*src++, dst++);
587 if (c & 3) {
588 u8 *src8 = (u8 *) src;
589 u8 __iomem *dst8 = (u8 __iomem *) dst;
590
591 for (i = c & 3; i--; )
592 fb_writeb(*src8++, dst8++);
593
594 dst = (u32 __iomem *) dst8;
595 }
596 *ppos += c;
597 buf += c;
598 cnt += c;
599 count -= c;
600 }
601 kfree(buffer);
602
603 return (err) ? err : cnt;
604}
605
606#ifdef CONFIG_KMOD
607static void try_to_load(int fb)
608{
609 request_module("fb%d", fb);
610}
611#endif /* CONFIG_KMOD */
612
613int
614fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
615{
616 int xoffset = var->xoffset;
617 int yoffset = var->yoffset;
618 int err;
619
620 if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
621 xoffset + info->var.xres > info->var.xres_virtual ||
622 yoffset + info->var.yres > info->var.yres_virtual)
623 return -EINVAL;
624 if ((err = info->fbops->fb_pan_display(var, info)))
625 return err;
626 info->var.xoffset = var->xoffset;
627 info->var.yoffset = var->yoffset;
628 if (var->vmode & FB_VMODE_YWRAP)
629 info->var.vmode |= FB_VMODE_YWRAP;
630 else
631 info->var.vmode &= ~FB_VMODE_YWRAP;
632 return 0;
633}
634
635int
636fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
637{
3edea483 638 int err, flags = info->flags;
1da177e4
LT		 639
640 if (var->activate & FB_ACTIVATE_INV_MODE) {
641 struct fb_videomode mode1, mode2;
642 int ret = 0;
643
644 fb_var_to_videomode(&mode1, var);
645 fb_var_to_videomode(&mode2, &info->var);
646 /* make sure we don't delete the videomode of current var */
647 ret = fb_mode_is_equal(&mode1, &mode2);
648
649 if (!ret) {
650 struct fb_event event;
651
652 event.info = info;
653 event.data = &mode1;
654 ret = notifier_call_chain(&fb_notifier_list,
655 FB_EVENT_MODE_DELETE, &event);
656 }
657
658 if (!ret)
659 fb_delete_videomode(&mode1, &info->modelist);
660
661 return ret;
662 }
663
664 if ((var->activate & FB_ACTIVATE_FORCE) ||
665 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
666 if (!info->fbops->fb_check_var) {
667 *var = info->var;
668 return 0;
669 }
670
671 if ((err = info->fbops->fb_check_var(var, info)))
672 return err;
673
674 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
675 struct fb_videomode mode;
676 int err = 0;
677
678 info->var = *var;
679 if (info->fbops->fb_set_par)
680 info->fbops->fb_set_par(info);
681
682 fb_pan_display(info, &info->var);
683
684 fb_set_cmap(&info->cmap, info);
685
686 fb_var_to_videomode(&mode, &info->var);
687
688 if (info->modelist.prev && info->modelist.next &&
689 !list_empty(&info->modelist))
690 err = fb_add_videomode(&mode, &info->modelist);
691
3edea483 692 if (!err && (flags & FBINFO_MISC_USEREVENT)) {
1da177e4 693 struct fb_event event;
7726e9e1
AD		 694 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
695 FB_EVENT_MODE_CHANGE_ALL :
696 FB_EVENT_MODE_CHANGE;
1da177e4
LT		 697
698 info->flags &= ~FBINFO_MISC_USEREVENT;
699 event.info = info;
7726e9e1 700 notifier_call_chain(&fb_notifier_list, evnt,
1da177e4
LT		 701 &event);
702 }
703 }
704 }
705 return 0;
706}
707
708int
709fb_blank(struct fb_info *info, int blank)
710{
711 int ret = -EINVAL;
712
713 if (blank > FB_BLANK_POWERDOWN)
714 blank = FB_BLANK_POWERDOWN;
715
716 if (info->fbops->fb_blank)
717 ret = info->fbops->fb_blank(blank, info);
718
719 if (!ret) {
720 struct fb_event event;
721
722 event.info = info;
723 event.data = &blank;
724 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
725 }
726
727 return ret;
728}
729
730static int
731fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
732 unsigned long arg)
733{
734 int fbidx = iminor(inode);
735 struct fb_info *info = registered_fb[fbidx];
736 struct fb_ops *fb = info->fbops;
737 struct fb_var_screeninfo var;
738 struct fb_fix_screeninfo fix;
739 struct fb_con2fbmap con2fb;
740 struct fb_cmap_user cmap;
741 struct fb_event event;
742 void __user *argp = (void __user *)arg;
743 int i;
744
745 if (!fb)
746 return -ENODEV;
747 switch (cmd) {
748 case FBIOGET_VSCREENINFO:
749 return copy_to_user(argp, &info->var,
750 sizeof(var)) ? -EFAULT : 0;
751 case FBIOPUT_VSCREENINFO:
752 if (copy_from_user(&var, argp, sizeof(var)))
753 return -EFAULT;
754 acquire_console_sem();
755 info->flags |= FBINFO_MISC_USEREVENT;
756 i = fb_set_var(info, &var);
757 info->flags &= ~FBINFO_MISC_USEREVENT;
758 release_console_sem();
759 if (i) return i;
760 if (copy_to_user(argp, &var, sizeof(var)))
761 return -EFAULT;
762 return 0;
763 case FBIOGET_FSCREENINFO:
764 return copy_to_user(argp, &info->fix,
765 sizeof(fix)) ? -EFAULT : 0;
766 case FBIOPUTCMAP:
767 if (copy_from_user(&cmap, argp, sizeof(cmap)))
768 return -EFAULT;
769 return (fb_set_user_cmap(&cmap, info));
770 case FBIOGETCMAP:
771 if (copy_from_user(&cmap, argp, sizeof(cmap)))
772 return -EFAULT;
773 return fb_cmap_to_user(&info->cmap, &cmap);
774 case FBIOPAN_DISPLAY:
775 if (copy_from_user(&var, argp, sizeof(var)))
776 return -EFAULT;
777 acquire_console_sem();
778 i = fb_pan_display(info, &var);
779 release_console_sem();
780 if (i)
781 return i;
782 if (copy_to_user(argp, &var, sizeof(var)))
783 return -EFAULT;
784 return 0;
785 case FBIO_CURSOR:
786 return -EINVAL;
787 case FBIOGET_CON2FBMAP:
788 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
789 return -EFAULT;
790 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
791 return -EINVAL;
792 con2fb.framebuffer = -1;
793 event.info = info;
794 event.data = &con2fb;
795 notifier_call_chain(&fb_notifier_list,
796 FB_EVENT_GET_CONSOLE_MAP, &event);
797 return copy_to_user(argp, &con2fb,
798 sizeof(con2fb)) ? -EFAULT : 0;
799 case FBIOPUT_CON2FBMAP:
800 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
801 return - EFAULT;
802 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
803 return -EINVAL;
804 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
805 return -EINVAL;
806#ifdef CONFIG_KMOD
807 if (!registered_fb[con2fb.framebuffer])
808 try_to_load(con2fb.framebuffer);
809#endif /* CONFIG_KMOD */
810 if (!registered_fb[con2fb.framebuffer])
811 return -EINVAL;
812 event.info = info;
813 event.data = &con2fb;
814 return notifier_call_chain(&fb_notifier_list,
815 FB_EVENT_SET_CONSOLE_MAP,
816 &event);
817 case FBIOBLANK:
818 acquire_console_sem();
819 info->flags |= FBINFO_MISC_USEREVENT;
820 i = fb_blank(info, arg);
821 info->flags &= ~FBINFO_MISC_USEREVENT;
822 release_console_sem();
823 return i;
824 default:
825 if (fb->fb_ioctl == NULL)
826 return -EINVAL;
827 return fb->fb_ioctl(inode, file, cmd, arg, info);
828 }
829}
830
831#ifdef CONFIG_COMPAT
832static long
833fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
834{
835 int fbidx = iminor(file->f_dentry->d_inode);
836 struct fb_info *info = registered_fb[fbidx];
837 struct fb_ops *fb = info->fbops;
838 long ret;
839
840 if (fb->fb_compat_ioctl == NULL)
841 return -ENOIOCTLCMD;
842 lock_kernel();
843 ret = fb->fb_compat_ioctl(file, cmd, arg, info);
844 unlock_kernel();
845 return ret;
846}
847#endif
848
849static int
850fb_mmap(struct file *file, struct vm_area_struct * vma)
851{
852 int fbidx = iminor(file->f_dentry->d_inode);
853 struct fb_info *info = registered_fb[fbidx];
854 struct fb_ops *fb = info->fbops;
855 unsigned long off;
856#if !defined(__sparc__) || defined(__sparc_v9__)
857 unsigned long start;
858 u32 len;
859#endif
860
861 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
862 return -EINVAL;
863 off = vma->vm_pgoff << PAGE_SHIFT;
864 if (!fb)
865 return -ENODEV;
866 if (fb->fb_mmap) {
867 int res;
868 lock_kernel();
869 res = fb->fb_mmap(info, file, vma);
870 unlock_kernel();
871 return res;
872 }
873
874#if defined(__sparc__) && !defined(__sparc_v9__)
875 /* Should never get here, all fb drivers should have their own
876 mmap routines */
877 return -EINVAL;
878#else
879 /* !sparc32... */
880 lock_kernel();
881
882 /* frame buffer memory */
883 start = info->fix.smem_start;
884 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
885 if (off >= len) {
886 /* memory mapped io */
887 off -= len;
888 if (info->var.accel_flags) {
889 unlock_kernel();
890 return -EINVAL;
891 }
892 start = info->fix.mmio_start;
893 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
894 }
895 unlock_kernel();
896 start &= PAGE_MASK;
897 if ((vma->vm_end - vma->vm_start + off) > len)
898 return -EINVAL;
899 off += start;
900 vma->vm_pgoff = off >> PAGE_SHIFT;
901 /* This is an IO map - tell maydump to skip this VMA */
902 vma->vm_flags |= VM_IO | VM_RESERVED;
903#if defined(__sparc_v9__)
904 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
905 vma->vm_end - vma->vm_start, vma->vm_page_prot))
906 return -EAGAIN;
907#else
908#if defined(__mc68000__)
909#if defined(CONFIG_SUN3)
910 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
911#elif defined(CONFIG_MMU)
912 if (CPU_IS_020_OR_030)
913 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
914 if (CPU_IS_040_OR_060) {
915 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
916 /* Use no-cache mode, serialized */
917 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
918 }
919#endif
920#elif defined(__powerpc__)
8b150478 921 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1da177e4
LT		 922 vma->vm_end - vma->vm_start,
923 vma->vm_page_prot);
924#elif defined(__alpha__)
925 /* Caching is off in the I/O space quadrant by design. */
926#elif defined(__i386__) || defined(__x86_64__)
927 if (boot_cpu_data.x86 > 3)
928 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
929#elif defined(__mips__)
930 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
931#elif defined(__hppa__)
932 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
933#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
934 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
935#elif defined(__ia64__)
936 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
937 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
938 else
939 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
940#else
941#warning What do we have to do here??
942#endif
943 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
944 vma->vm_end - vma->vm_start, vma->vm_page_prot))
945 return -EAGAIN;
946#endif /* !__sparc_v9__ */
947 return 0;
948#endif /* !sparc32 */
949}
950
951static int
952fb_open(struct inode *inode, struct file *file)
953{
954 int fbidx = iminor(inode);
955 struct fb_info *info;
956 int res = 0;
957
958 if (fbidx >= FB_MAX)
959 return -ENODEV;
960#ifdef CONFIG_KMOD
961 if (!(info = registered_fb[fbidx]))
962 try_to_load(fbidx);
963#endif /* CONFIG_KMOD */
964 if (!(info = registered_fb[fbidx]))
965 return -ENODEV;
966 if (!try_module_get(info->fbops->owner))
967 return -ENODEV;
968 if (info->fbops->fb_open) {
969 res = info->fbops->fb_open(info,1);
970 if (res)
971 module_put(info->fbops->owner);
972 }
973 return res;
974}
975
976static int
977fb_release(struct inode *inode, struct file *file)
978{
979 int fbidx = iminor(inode);
980 struct fb_info *info;
981
982 lock_kernel();
983 info = registered_fb[fbidx];
984 if (info->fbops->fb_release)
985 info->fbops->fb_release(info,1);
986 module_put(info->fbops->owner);
987 unlock_kernel();
988 return 0;
989}
990
991static struct file_operations fb_fops = {
992 .owner = THIS_MODULE,
993 .read = fb_read,
994 .write = fb_write,
995 .ioctl = fb_ioctl,
996#ifdef CONFIG_COMPAT
997 .compat_ioctl = fb_compat_ioctl,
998#endif
999 .mmap = fb_mmap,
1000 .open = fb_open,
1001 .release = fb_release,
1002#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1003 .get_unmapped_area = get_fb_unmapped_area,
1004#endif
1005};
1006
56b22935 1007static struct class *fb_class;
1da177e4
LT		 1008
1009/**
1010 * register_framebuffer - registers a frame buffer device
1011 * @fb_info: frame buffer info structure
1012 *
1013 * Registers a frame buffer device @fb_info.
1014 *
1015 * Returns negative errno on error, or zero for success.
1016 *
1017 */
1018
1019int
1020register_framebuffer(struct fb_info *fb_info)
1021{
1022 int i;
1023 struct fb_event event;
96fe6a21 1024 struct fb_videomode mode;
1da177e4
LT		 1025
1026 if (num_registered_fb == FB_MAX)
1027 return -ENXIO;
1028 num_registered_fb++;
1029 for (i = 0 ; i < FB_MAX; i++)
1030 if (!registered_fb[i])
1031 break;
1032 fb_info->node = i;
1033
53f46542 1034 fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1da177e4
LT		 1035 fb_info->device, "fb%d", i);
1036 if (IS_ERR(fb_info->class_device)) {
1037 /* Not fatal */
1038 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1039 fb_info->class_device = NULL;
1040 } else
1041 fb_init_class_device(fb_info);
1042
1043 if (fb_info->pixmap.addr == NULL) {
1044 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1045 if (fb_info->pixmap.addr) {
1046 fb_info->pixmap.size = FBPIXMAPSIZE;
1047 fb_info->pixmap.buf_align = 1;
1048 fb_info->pixmap.scan_align = 1;
58a60643 1049 fb_info->pixmap.access_align = 32;
1da177e4
LT		 1050 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1051 }
1052 }
1053 fb_info->pixmap.offset = 0;
1054
96fe6a21 1055 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1da177e4 1056 INIT_LIST_HEAD(&fb_info->modelist);
1da177e4 1057
96fe6a21
AD		 1058 fb_var_to_videomode(&mode, &fb_info->var);
1059 fb_add_videomode(&mode, &fb_info->modelist);
1da177e4
LT		 1060 registered_fb[i] = fb_info;
1061
1062 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1063 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1064 event.info = fb_info;
1065 notifier_call_chain(&fb_notifier_list,
1066 FB_EVENT_FB_REGISTERED, &event);
1067 return 0;
1068}
1069
1070
1071/**
1072 * unregister_framebuffer - releases a frame buffer device
1073 * @fb_info: frame buffer info structure
1074 *
1075 * Unregisters a frame buffer device @fb_info.
1076 *
1077 * Returns negative errno on error, or zero for success.
1078 *
1079 */
1080
1081int
1082unregister_framebuffer(struct fb_info *fb_info)
1083{
1084 int i;
1085
1086 i = fb_info->node;
1087 if (!registered_fb[i])
1088 return -EINVAL;
1089 devfs_remove("fb/%d", i);
1090
1091 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1092 kfree(fb_info->pixmap.addr);
1093 fb_destroy_modelist(&fb_info->modelist);
1094 registered_fb[i]=NULL;
1095 num_registered_fb--;
1096 fb_cleanup_class_device(fb_info);
56b22935 1097 class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1da177e4
LT		 1098 return 0;
1099}
1100
1101/**
1102 * fb_register_client - register a client notifier
1103 * @nb: notifier block to callback on events
1104 */
1105int fb_register_client(struct notifier_block *nb)
1106{
1107 return notifier_chain_register(&fb_notifier_list, nb);
1108}
1109
1110/**
1111 * fb_unregister_client - unregister a client notifier
1112 * @nb: notifier block to callback on events
1113 */
1114int fb_unregister_client(struct notifier_block *nb)
1115{
1116 return notifier_chain_unregister(&fb_notifier_list, nb);
1117}
1118
1119/**
1120 * fb_set_suspend - low level driver signals suspend
1121 * @info: framebuffer affected
1122 * @state: 0 = resuming, !=0 = suspending
1123 *
1124 * This is meant to be used by low level drivers to
1125 * signal suspend/resume to the core & clients.
1126 * It must be called with the console semaphore held
1127 */
1128void fb_set_suspend(struct fb_info *info, int state)
1129{
1130 struct fb_event event;
1131
1132 event.info = info;
1133 if (state) {
1134 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1135 info->state = FBINFO_STATE_SUSPENDED;
1136 } else {
1137 info->state = FBINFO_STATE_RUNNING;
1138 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1139 }
1140}
1141
1142/**
1143 * fbmem_init - init frame buffer subsystem
1144 *
1145 * Initialize the frame buffer subsystem.
1146 *
1147 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1148 *
1149 */
1150
1151static int __init
1152fbmem_init(void)
1153{
1154 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1155
1156 devfs_mk_dir("fb");
1157 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1158 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1159
56b22935 1160 fb_class = class_create(THIS_MODULE, "graphics");
1da177e4
LT		 1161 if (IS_ERR(fb_class)) {
1162 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1163 fb_class = NULL;
1164 }
1165 return 0;
1166}
1167
1168#ifdef MODULE
1169module_init(fbmem_init);
1170static void __exit
1171fbmem_exit(void)
1172{
56b22935 1173 class_destroy(fb_class);
5a340cce 1174 unregister_chrdev(FB_MAJOR, "fb");
1da177e4
LT		 1175}
1176
1177module_exit(fbmem_exit);
1178MODULE_LICENSE("GPL");
1179MODULE_DESCRIPTION("Framebuffer base");
1180#else
1181subsys_initcall(fbmem_init);
1182#endif
1183
1184int fb_new_modelist(struct fb_info *info)
1185{
1186 struct fb_event event;
1187 struct fb_var_screeninfo var = info->var;
1188 struct list_head *pos, *n;
1189 struct fb_modelist *modelist;
1190 struct fb_videomode *m, mode;
1191 int err = 1;
1192
1193 list_for_each_safe(pos, n, &info->modelist) {
1194 modelist = list_entry(pos, struct fb_modelist, list);
1195 m = &modelist->mode;
1196 fb_videomode_to_var(&var, m);
1197 var.activate = FB_ACTIVATE_TEST;
1198 err = fb_set_var(info, &var);
1199 fb_var_to_videomode(&mode, &var);
1200 if (err || !fb_mode_is_equal(m, &mode)) {
1201 list_del(pos);
1202 kfree(pos);
1203 }
1204 }
1205
1206 err = 1;
1207
1208 if (!list_empty(&info->modelist)) {
1209 event.info = info;
1210 err = notifier_call_chain(&fb_notifier_list,
1211 FB_EVENT_NEW_MODELIST,
1212 &event);
1213 }
1214
1215 return err;
1216}
1217
1218static char *video_options[FB_MAX];
1219static int ofonly;
1220
4dc3b16b
PP		 1221extern const char *global_mode_option;
1222
1da177e4
LT		 1223/**
1224 * fb_get_options - get kernel boot parameters
1225 * @name: framebuffer name as it would appear in
1226 * the boot parameter line
1227 * (video=<name>:<options>)
1228 * @option: the option will be stored here
1229 *
1230 * NOTE: Needed to maintain backwards compatibility
1231 */
1232int fb_get_options(char *name, char **option)
1233{
1234 char *opt, *options = NULL;
1235 int opt_len, retval = 0;
1236 int name_len = strlen(name), i;
1237
1238 if (name_len && ofonly && strncmp(name, "offb", 4))
1239 retval = 1;
1240
1241 if (name_len && !retval) {
1242 for (i = 0; i < FB_MAX; i++) {
1243 if (video_options[i] == NULL)
1244 continue;
1245 opt_len = strlen(video_options[i]);
1246 if (!opt_len)
1247 continue;
1248 opt = video_options[i];
1249 if (!strncmp(name, opt, name_len) &&
1250 opt[name_len] == ':')
1251 options = opt + name_len + 1;
1252 }
1253 }
1254 if (options && !strncmp(options, "off", 3))
1255 retval = 1;
1256
1257 if (option)
1258 *option = options;
1259
1260 return retval;
1261}
1262
1da177e4
LT		 1263/**
1264 * video_setup - process command line options
1265 * @options: string of options
1266 *
1267 * Process command line options for frame buffer subsystem.
1268 *
1269 * NOTE: This function is a __setup and __init function.
1270 * It only stores the options. Drivers have to call
1271 * fb_get_options() as necessary.
1272 *
1273 * Returns zero.
1274 *
1275 */
75c96f85 1276static int __init video_setup(char *options)
1da177e4
LT		 1277{
1278 int i, global = 0;
1279
1280 if (!options || !*options)
1281 global = 1;
1282
1283 if (!global && !strncmp(options, "ofonly", 6)) {
1284 ofonly = 1;
1285 global = 1;
1286 }
1287
1288 if (!global && !strstr(options, "fb:")) {
1289 global_mode_option = options;
1290 global = 1;
1291 }
1292
1293 if (!global) {
1294 for (i = 0; i < FB_MAX; i++) {
1295 if (video_options[i] == NULL) {
1296 video_options[i] = options;
1297 break;
1298 }
1299
1300 }
1301 }
1302
1303 return 0;
1304}
1305__setup("video=", video_setup);
1306
1307 /*
1308 * Visible symbols for modules
1309 */
1310
1311EXPORT_SYMBOL(register_framebuffer);
1312EXPORT_SYMBOL(unregister_framebuffer);
1313EXPORT_SYMBOL(num_registered_fb);
1314EXPORT_SYMBOL(registered_fb);
1315EXPORT_SYMBOL(fb_prepare_logo);
1316EXPORT_SYMBOL(fb_show_logo);
1317EXPORT_SYMBOL(fb_set_var);
1318EXPORT_SYMBOL(fb_blank);
1319EXPORT_SYMBOL(fb_pan_display);
1320EXPORT_SYMBOL(fb_get_buffer_offset);
1da177e4
LT		 1321EXPORT_SYMBOL(fb_set_suspend);
1322EXPORT_SYMBOL(fb_register_client);
1323EXPORT_SYMBOL(fb_unregister_client);
1324EXPORT_SYMBOL(fb_get_options);
1325EXPORT_SYMBOL(fb_new_modelist);
1326
1327MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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