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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmem.c
blob25f460ca0daf10c14290e36f013805f1f784495f
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
57 static struct notifier_block *fb_notifier_list;
58 struct fb_info *registered_fb[FB_MAX];
59 int num_registered_fb;
60
61 /*
62 * Helpers
63 */
64
65 int 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 }
76 EXPORT_SYMBOL(fb_get_color_depth);
77
78 /*
79 * Drawing helpers.
80 */
81 void fb_iomove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
82 u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
83 u32 height)
84 {
85 int i;
86
87 for (i = height; i--; ) {
88 buf->outbuf(info, dst, src, s_pitch);
89 src += s_pitch;
90 dst += d_pitch;
91 }
92 }
93
94 void fb_sysmove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
95 u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
96 u32 height)
97 {
98 int i, j;
99
100 for (i = height; i--; ) {
101 for (j = 0; j < s_pitch; j++)
102 dst[j] = src[j];
103 src += s_pitch;
104 dst += d_pitch;
105 }
106 }
107
108 void fb_iomove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
109 u8 *dst, u32 d_pitch, u8 *src, u32 idx,
110 u32 height, u32 shift_high, u32 shift_low,
111 u32 mod)
112 {
113 u8 mask = (u8) (0xfff << shift_high), tmp;
114 int i, j;
115
116 for (i = height; i--; ) {
117 for (j = 0; j < idx; j++) {
118 tmp = buf->inbuf(info, dst+j);
119 tmp &= mask;
120 tmp |= *src >> shift_low;
121 buf->outbuf(info, dst+j, &tmp, 1);
122 tmp = *src << shift_high;
123 buf->outbuf(info, dst+j+1, &tmp, 1);
124 src++;
125 }
126 tmp = buf->inbuf(info, dst+idx);
127 tmp &= mask;
128 tmp |= *src >> shift_low;
129 buf->outbuf(info, dst+idx, &tmp, 1);
130 if (shift_high < mod) {
131 tmp = *src << shift_high;
132 buf->outbuf(info, dst+idx+1, &tmp, 1);
133 }
134 src++;
135 dst += d_pitch;
136 }
137 }
138
139 void fb_sysmove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
140 u8 *dst, u32 d_pitch, u8 *src, u32 idx,
141 u32 height, u32 shift_high, u32 shift_low,
142 u32 mod)
143 {
144 u8 mask = (u8) (0xfff << shift_high), tmp;
145 int i, j;
146
147 for (i = height; i--; ) {
148 for (j = 0; j < idx; j++) {
149 tmp = dst[j];
150 tmp &= mask;
151 tmp |= *src >> shift_low;
152 dst[j] = tmp;
153 tmp = *src << shift_high;
154 dst[j+1] = tmp;
155 src++;
156 }
157 tmp = dst[idx];
158 tmp &= mask;
159 tmp |= *src >> shift_low;
160 dst[idx] = tmp;
161 if (shift_high < mod) {
162 tmp = *src << shift_high;
163 dst[idx+1] = tmp;
164 }
165 src++;
166 dst += d_pitch;
167 }
168 }
169
170 /*
171 * we need to lock this section since fb_cursor
172 * may use fb_imageblit()
173 */
174 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
175 {
176 u32 align = buf->buf_align - 1, offset;
177 char *addr = buf->addr;
178
179 /* If IO mapped, we need to sync before access, no sharing of
180 * the pixmap is done
181 */
182 if (buf->flags & FB_PIXMAP_IO) {
183 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
184 info->fbops->fb_sync(info);
185 return addr;
186 }
187
188 /* See if we fit in the remaining pixmap space */
189 offset = buf->offset + align;
190 offset &= ~align;
191 if (offset + size > buf->size) {
192 /* We do not fit. In order to be able to re-use the buffer,
193 * we must ensure no asynchronous DMA'ing or whatever operation
194 * is in progress, we sync for that.
195 */
196 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
197 info->fbops->fb_sync(info);
198 offset = 0;
199 }
200 buf->offset = offset + size;
201 addr += offset;
202
203 return addr;
204 }
205
206 #ifdef CONFIG_LOGO
207 #include <linux/linux_logo.h>
208
209 static inline unsigned safe_shift(unsigned d, int n)
210 {
211 return n < 0 ? d >> -n : d << n;
212 }
213
214 static void fb_set_logocmap(struct fb_info *info,
215 const struct linux_logo *logo)
216 {
217 struct fb_cmap palette_cmap;
218 u16 palette_green[16];
219 u16 palette_blue[16];
220 u16 palette_red[16];
221 int i, j, n;
222 const unsigned char *clut = logo->clut;
223
224 palette_cmap.start = 0;
225 palette_cmap.len = 16;
226 palette_cmap.red = palette_red;
227 palette_cmap.green = palette_green;
228 palette_cmap.blue = palette_blue;
229 palette_cmap.transp = NULL;
230
231 for (i = 0; i < logo->clutsize; i += n) {
232 n = logo->clutsize - i;
233 /* palette_cmap provides space for only 16 colors at once */
234 if (n > 16)
235 n = 16;
236 palette_cmap.start = 32 + i;
237 palette_cmap.len = n;
238 for (j = 0; j < n; ++j) {
239 palette_cmap.red[j] = clut[0] << 8 | clut[0];
240 palette_cmap.green[j] = clut[1] << 8 | clut[1];
241 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
242 clut += 3;
243 }
244 fb_set_cmap(&palette_cmap, info);
245 }
246 }
247
248 static void fb_set_logo_truepalette(struct fb_info *info,
249 const struct linux_logo *logo,
250 u32 *palette)
251 {
252 unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
253 unsigned char redmask, greenmask, bluemask;
254 int redshift, greenshift, blueshift;
255 int i;
256 const unsigned char *clut = logo->clut;
257
258 /*
259 * We have to create a temporary palette since console palette is only
260 * 16 colors long.
261 */
262 /* Bug: Doesn't obey msb_right ... (who needs that?) */
263 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
264 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
265 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
266 redshift = info->var.red.offset - (8 - info->var.red.length);
267 greenshift = info->var.green.offset - (8 - info->var.green.length);
268 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
269
270 for ( i = 0; i < logo->clutsize; i++) {
271 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
272 safe_shift((clut[1] & greenmask), greenshift) |
273 safe_shift((clut[2] & bluemask), blueshift));
274 clut += 3;
275 }
276 }
277
278 static void fb_set_logo_directpalette(struct fb_info *info,
279 const struct linux_logo *logo,
280 u32 *palette)
281 {
282 int redshift, greenshift, blueshift;
283 int i;
284
285 redshift = info->var.red.offset;
286 greenshift = info->var.green.offset;
287 blueshift = info->var.blue.offset;
288
289 for (i = 32; i < logo->clutsize; i++)
290 palette[i] = i << redshift | i << greenshift | i << blueshift;
291 }
292
293 static void fb_set_logo(struct fb_info *info,
294 const struct linux_logo *logo, u8 *dst,
295 int depth)
296 {
297 int i, j, k, fg = 1;
298 const u8 *src = logo->data;
299 u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
300
301 if (fb_get_color_depth(&info->var) == 3)
302 fg = 7;
303
304 switch (depth) {
305 case 4:
306 for (i = 0; i < logo->height; i++)
307 for (j = 0; j < logo->width; src++) {
308 *dst++ = *src >> 4;
309 j++;
310 if (j < logo->width) {
311 *dst++ = *src & 0x0f;
312 j++;
313 }
314 }
315 break;
316 case 1:
317 for (i = 0; i < logo->height; i++) {
318 for (j = 0; j < logo->width; src++) {
319 d = *src ^ xor;
320 for (k = 7; k >= 0; k--) {
321 *dst++ = ((d >> k) & 1) ? fg : 0;
322 j++;
323 }
324 }
325 }
326 break;
327 }
328 }
329
330 /*
331 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
332 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
333 * the visual format and color depth of the framebuffer, the DAC, the
334 * pseudo_palette, and the logo data will be adjusted accordingly.
335 *
336 * Case 1 - linux_logo_clut224:
337 * Color exceeds the number of console colors (16), thus we set the hardware DAC
338 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
339 *
340 * For visuals that require color info from the pseudo_palette, we also construct
341 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
342 * will be set.
343 *
344 * Case 2 - linux_logo_vga16:
345 * The number of colors just matches the console colors, thus there is no need
346 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
347 * each byte contains color information for two pixels (upper and lower nibble).
348 * To be consistent with fb_imageblit() usage, we therefore separate the two
349 * nibbles into separate bytes. The "depth" flag will be set to 4.
350 *
351 * Case 3 - linux_logo_mono:
352 * This is similar with Case 2. Each byte contains information for 8 pixels.
353 * We isolate each bit and expand each into a byte. The "depth" flag will
354 * be set to 1.
355 */
356 static struct logo_data {
357 int depth;
358 int needs_directpalette;
359 int needs_truepalette;
360 int needs_cmapreset;
361 const struct linux_logo *logo;
362 } fb_logo;
363
364 int fb_prepare_logo(struct fb_info *info)
365 {
366 int depth = fb_get_color_depth(&info->var);
367
368 memset(&fb_logo, 0, sizeof(struct logo_data));
369
370 if (info->flags & FBINFO_MISC_TILEBLITTING)
371 return 0;
372
373 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
374 depth = info->var.blue.length;
375 if (info->var.red.length < depth)
376 depth = info->var.red.length;
377 if (info->var.green.length < depth)
378 depth = info->var.green.length;
379 }
380
381 if (depth >= 8) {
382 switch (info->fix.visual) {
383 case FB_VISUAL_TRUECOLOR:
384 fb_logo.needs_truepalette = 1;
385 break;
386 case FB_VISUAL_DIRECTCOLOR:
387 fb_logo.needs_directpalette = 1;
388 fb_logo.needs_cmapreset = 1;
389 break;
390 case FB_VISUAL_PSEUDOCOLOR:
391 fb_logo.needs_cmapreset = 1;
392 break;
393 }
394 }
395
396 /* Return if no suitable logo was found */
397 fb_logo.logo = fb_find_logo(depth);
398
399 if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
400 fb_logo.logo = NULL;
401 return 0;
402 }
403 /* What depth we asked for might be different from what we get */
404 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
405 fb_logo.depth = 8;
406 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
407 fb_logo.depth = 4;
408 else
409 fb_logo.depth = 1;
410 return fb_logo.logo->height;
411 }
412
413 int fb_show_logo(struct fb_info *info)
414 {
415 u32 *palette = NULL, *saved_pseudo_palette = NULL;
416 unsigned char *logo_new = NULL;
417 struct fb_image image;
418 int x;
419
420 /* Return if the frame buffer is not mapped or suspended */
421 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
422 return 0;
423
424 image.depth = 8;
425 image.data = fb_logo.logo->data;
426
427 if (fb_logo.needs_cmapreset)
428 fb_set_logocmap(info, fb_logo.logo);
429
430 if (fb_logo.needs_truepalette ||
431 fb_logo.needs_directpalette) {
432 palette = kmalloc(256 * 4, GFP_KERNEL);
433 if (palette == NULL)
434 return 0;
435
436 if (fb_logo.needs_truepalette)
437 fb_set_logo_truepalette(info, fb_logo.logo, palette);
438 else
439 fb_set_logo_directpalette(info, fb_logo.logo, palette);
440
441 saved_pseudo_palette = info->pseudo_palette;
442 info->pseudo_palette = palette;
443 }
444
445 if (fb_logo.depth <= 4) {
446 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
447 GFP_KERNEL);
448 if (logo_new == NULL) {
449 kfree(palette);
450 if (saved_pseudo_palette)
451 info->pseudo_palette = saved_pseudo_palette;
452 return 0;
453 }
454 image.data = logo_new;
455 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
456 }
457
458 image.width = fb_logo.logo->width;
459 image.height = fb_logo.logo->height;
460 image.dy = 0;
461
462 for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
463 x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
464 image.dx = x;
465 info->fbops->fb_imageblit(info, &image);
466 }
467
468 kfree(palette);
469 if (saved_pseudo_palette != NULL)
470 info->pseudo_palette = saved_pseudo_palette;
471 kfree(logo_new);
472 return fb_logo.logo->height;
473 }
474 #else
475 int fb_prepare_logo(struct fb_info *info) { return 0; }
476 int fb_show_logo(struct fb_info *info) { return 0; }
477 #endif /* CONFIG_LOGO */
478
479 static int fbmem_read_proc(char *buf, char **start, off_t offset,
480 int len, int *eof, void *private)
481 {
482 struct fb_info **fi;
483 int clen;
484
485 clen = 0;
486 for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
487 if (*fi)
488 clen += sprintf(buf + clen, "%d %s\n",
489 (*fi)->node,
490 (*fi)->fix.id);
491 *start = buf + offset;
492 if (clen > offset)
493 clen -= offset;
494 else
495 clen = 0;
496 return clen < len ? clen : len;
497 }
498
499 static ssize_t
500 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
501 {
502 unsigned long p = *ppos;
503 struct inode *inode = file->f_dentry->d_inode;
504 int fbidx = iminor(inode);
505 struct fb_info *info = registered_fb[fbidx];
506 u32 *buffer, *dst;
507 u32 __iomem *src;
508 int c, i, cnt = 0, err = 0;
509 unsigned long total_size;
510
511 if (!info || ! info->screen_base)
512 return -ENODEV;
513
514 if (info->state != FBINFO_STATE_RUNNING)
515 return -EPERM;
516
517 if (info->fbops->fb_read)
518 return info->fbops->fb_read(file, buf, count, ppos);
519
520 total_size = info->screen_size;
521 if (total_size == 0)
522 total_size = info->fix.smem_len;
523
524 if (p >= total_size)
525 return 0;
526 if (count >= total_size)
527 count = total_size;
528 if (count + p > total_size)
529 count = total_size - p;
530
531 cnt = 0;
532 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
533 GFP_KERNEL);
534 if (!buffer)
535 return -ENOMEM;
536
537 src = (u32 __iomem *) (info->screen_base + p);
538
539 if (info->fbops->fb_sync)
540 info->fbops->fb_sync(info);
541
542 while (count) {
543 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
544 dst = buffer;
545 for (i = c >> 2; i--; )
546 *dst++ = fb_readl(src++);
547 if (c & 3) {
548 u8 *dst8 = (u8 *) dst;
549 u8 __iomem *src8 = (u8 __iomem *) src;
550
551 for (i = c & 3; i--;)
552 *dst8++ = fb_readb(src8++);
553
554 src = (u32 __iomem *) src8;
555 }
556
557 if (copy_to_user(buf, buffer, c)) {
558 err = -EFAULT;
559 break;
560 }
561 *ppos += c;
562 buf += c;
563 cnt += c;
564 count -= c;
565 }
566
567 kfree(buffer);
568 return (err) ? err : cnt;
569 }
570
571 static ssize_t
572 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
573 {
574 unsigned long p = *ppos;
575 struct inode *inode = file->f_dentry->d_inode;
576 int fbidx = iminor(inode);
577 struct fb_info *info = registered_fb[fbidx];
578 u32 *buffer, *src;
579 u32 __iomem *dst;
580 int c, i, cnt = 0, err;
581 unsigned long total_size;
582
583 if (!info || !info->screen_base)
584 return -ENODEV;
585
586 if (info->state != FBINFO_STATE_RUNNING)
587 return -EPERM;
588
589 if (info->fbops->fb_write)
590 return info->fbops->fb_write(file, buf, count, ppos);
591
592 total_size = info->screen_size;
593 if (total_size == 0)
594 total_size = info->fix.smem_len;
595
596 if (p > total_size)
597 return -ENOSPC;
598 if (count >= total_size)
599 count = total_size;
600 err = 0;
601 if (count + p > total_size) {
602 count = total_size - p;
603 err = -ENOSPC;
604 }
605 cnt = 0;
606 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
607 GFP_KERNEL);
608 if (!buffer)
609 return -ENOMEM;
610
611 dst = (u32 __iomem *) (info->screen_base + p);
612
613 if (info->fbops->fb_sync)
614 info->fbops->fb_sync(info);
615
616 while (count) {
617 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
618 src = buffer;
619 if (copy_from_user(src, buf, c)) {
620 err = -EFAULT;
621 break;
622 }
623 for (i = c >> 2; i--; )
624 fb_writel(*src++, dst++);
625 if (c & 3) {
626 u8 *src8 = (u8 *) src;
627 u8 __iomem *dst8 = (u8 __iomem *) dst;
628
629 for (i = c & 3; i--; )
630 fb_writeb(*src8++, dst8++);
631
632 dst = (u32 __iomem *) dst8;
633 }
634 *ppos += c;
635 buf += c;
636 cnt += c;
637 count -= c;
638 }
639 kfree(buffer);
640
641 return (err) ? err : cnt;
642 }
643
644 #ifdef CONFIG_KMOD
645 static void try_to_load(int fb)
646 {
647 request_module("fb%d", fb);
648 }
649 #endif /* CONFIG_KMOD */
650
651 int
652 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
653 {
654 int xoffset = var->xoffset;
655 int yoffset = var->yoffset;
656 int err;
657
658 if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
659 xoffset + info->var.xres > info->var.xres_virtual ||
660 yoffset + info->var.yres > info->var.yres_virtual)
661 return -EINVAL;
662 if ((err = info->fbops->fb_pan_display(var, info)))
663 return err;
664 info->var.xoffset = var->xoffset;
665 info->var.yoffset = var->yoffset;
666 if (var->vmode & FB_VMODE_YWRAP)
667 info->var.vmode |= FB_VMODE_YWRAP;
668 else
669 info->var.vmode &= ~FB_VMODE_YWRAP;
670 return 0;
671 }
672
673 int
674 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
675 {
676 int err;
677
678 if (var->activate & FB_ACTIVATE_INV_MODE) {
679 struct fb_videomode mode1, mode2;
680 int ret = 0;
681
682 fb_var_to_videomode(&mode1, var);
683 fb_var_to_videomode(&mode2, &info->var);
684 /* make sure we don't delete the videomode of current var */
685 ret = fb_mode_is_equal(&mode1, &mode2);
686
687 if (!ret) {
688 struct fb_event event;
689
690 event.info = info;
691 event.data = &mode1;
692 ret = notifier_call_chain(&fb_notifier_list,
693 FB_EVENT_MODE_DELETE, &event);
694 }
695
696 if (!ret)
697 fb_delete_videomode(&mode1, &info->modelist);
698
699 return ret;
700 }
701
702 if ((var->activate & FB_ACTIVATE_FORCE) ||
703 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
704 if (!info->fbops->fb_check_var) {
705 *var = info->var;
706 return 0;
707 }
708
709 if ((err = info->fbops->fb_check_var(var, info)))
710 return err;
711
712 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
713 struct fb_videomode mode;
714 int err = 0;
715
716 info->var = *var;
717 if (info->fbops->fb_set_par)
718 info->fbops->fb_set_par(info);
719
720 fb_pan_display(info, &info->var);
721
722 fb_set_cmap(&info->cmap, info);
723
724 fb_var_to_videomode(&mode, &info->var);
725
726 if (info->modelist.prev && info->modelist.next &&
727 !list_empty(&info->modelist))
728 err = fb_add_videomode(&mode, &info->modelist);
729
730 if (!err && info->flags & FBINFO_MISC_USEREVENT) {
731 struct fb_event event;
732
733 info->flags &= ~FBINFO_MISC_USEREVENT;
734 event.info = info;
735 notifier_call_chain(&fb_notifier_list,
736 FB_EVENT_MODE_CHANGE,
737 &event);
738 }
739 }
740 }
741 return 0;
742 }
743
744 int
745 fb_blank(struct fb_info *info, int blank)
746 {
747 int ret = -EINVAL;
748
749 if (blank > FB_BLANK_POWERDOWN)
750 blank = FB_BLANK_POWERDOWN;
751
752 if (info->fbops->fb_blank)
753 ret = info->fbops->fb_blank(blank, info);
754
755 if (!ret) {
756 struct fb_event event;
757
758 event.info = info;
759 event.data = &blank;
760 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
761 }
762
763 return ret;
764 }
765
766 static int
767 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
768 unsigned long arg)
769 {
770 int fbidx = iminor(inode);
771 struct fb_info *info = registered_fb[fbidx];
772 struct fb_ops *fb = info->fbops;
773 struct fb_var_screeninfo var;
774 struct fb_fix_screeninfo fix;
775 struct fb_con2fbmap con2fb;
776 struct fb_cmap_user cmap;
777 struct fb_event event;
778 void __user *argp = (void __user *)arg;
779 int i;
780
781 if (!fb)
782 return -ENODEV;
783 switch (cmd) {
784 case FBIOGET_VSCREENINFO:
785 return copy_to_user(argp, &info->var,
786 sizeof(var)) ? -EFAULT : 0;
787 case FBIOPUT_VSCREENINFO:
788 if (copy_from_user(&var, argp, sizeof(var)))
789 return -EFAULT;
790 acquire_console_sem();
791 info->flags |= FBINFO_MISC_USEREVENT;
792 i = fb_set_var(info, &var);
793 info->flags &= ~FBINFO_MISC_USEREVENT;
794 release_console_sem();
795 if (i) return i;
796 if (copy_to_user(argp, &var, sizeof(var)))
797 return -EFAULT;
798 return 0;
799 case FBIOGET_FSCREENINFO:
800 return copy_to_user(argp, &info->fix,
801 sizeof(fix)) ? -EFAULT : 0;
802 case FBIOPUTCMAP:
803 if (copy_from_user(&cmap, argp, sizeof(cmap)))
804 return -EFAULT;
805 return (fb_set_user_cmap(&cmap, info));
806 case FBIOGETCMAP:
807 if (copy_from_user(&cmap, argp, sizeof(cmap)))
808 return -EFAULT;
809 return fb_cmap_to_user(&info->cmap, &cmap);
810 case FBIOPAN_DISPLAY:
811 if (copy_from_user(&var, argp, sizeof(var)))
812 return -EFAULT;
813 acquire_console_sem();
814 i = fb_pan_display(info, &var);
815 release_console_sem();
816 if (i)
817 return i;
818 if (copy_to_user(argp, &var, sizeof(var)))
819 return -EFAULT;
820 return 0;
821 case FBIO_CURSOR:
822 return -EINVAL;
823 case FBIOGET_CON2FBMAP:
824 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
825 return -EFAULT;
826 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
827 return -EINVAL;
828 con2fb.framebuffer = -1;
829 event.info = info;
830 event.data = &con2fb;
831 notifier_call_chain(&fb_notifier_list,
832 FB_EVENT_GET_CONSOLE_MAP, &event);
833 return copy_to_user(argp, &con2fb,
834 sizeof(con2fb)) ? -EFAULT : 0;
835 case FBIOPUT_CON2FBMAP:
836 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
837 return - EFAULT;
838 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
839 return -EINVAL;
840 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
841 return -EINVAL;
842 #ifdef CONFIG_KMOD
843 if (!registered_fb[con2fb.framebuffer])
844 try_to_load(con2fb.framebuffer);
845 #endif /* CONFIG_KMOD */
846 if (!registered_fb[con2fb.framebuffer])
847 return -EINVAL;
848 event.info = info;
849 event.data = &con2fb;
850 return notifier_call_chain(&fb_notifier_list,
851 FB_EVENT_SET_CONSOLE_MAP,
852 &event);
853 case FBIOBLANK:
854 acquire_console_sem();
855 info->flags |= FBINFO_MISC_USEREVENT;
856 i = fb_blank(info, arg);
857 info->flags &= ~FBINFO_MISC_USEREVENT;
858 release_console_sem();
859 return i;
860 default:
861 if (fb->fb_ioctl == NULL)
862 return -EINVAL;
863 return fb->fb_ioctl(inode, file, cmd, arg, info);
864 }
865 }
866
867 #ifdef CONFIG_COMPAT
868 static long
869 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
870 {
871 int fbidx = iminor(file->f_dentry->d_inode);
872 struct fb_info *info = registered_fb[fbidx];
873 struct fb_ops *fb = info->fbops;
874 long ret;
875
876 if (fb->fb_compat_ioctl == NULL)
877 return -ENOIOCTLCMD;
878 lock_kernel();
879 ret = fb->fb_compat_ioctl(file, cmd, arg, info);
880 unlock_kernel();
881 return ret;
882 }
883 #endif
884
885 static int
886 fb_mmap(struct file *file, struct vm_area_struct * vma)
887 {
888 int fbidx = iminor(file->f_dentry->d_inode);
889 struct fb_info *info = registered_fb[fbidx];
890 struct fb_ops *fb = info->fbops;
891 unsigned long off;
892 #if !defined(__sparc__) || defined(__sparc_v9__)
893 unsigned long start;
894 u32 len;
895 #endif
896
897 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
898 return -EINVAL;
899 off = vma->vm_pgoff << PAGE_SHIFT;
900 if (!fb)
901 return -ENODEV;
902 if (fb->fb_mmap) {
903 int res;
904 lock_kernel();
905 res = fb->fb_mmap(info, file, vma);
906 unlock_kernel();
907 return res;
908 }
909
910 #if defined(__sparc__) && !defined(__sparc_v9__)
911 /* Should never get here, all fb drivers should have their own
912 mmap routines */
913 return -EINVAL;
914 #else
915 /* !sparc32... */
916 lock_kernel();
917
918 /* frame buffer memory */
919 start = info->fix.smem_start;
920 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
921 if (off >= len) {
922 /* memory mapped io */
923 off -= len;
924 if (info->var.accel_flags) {
925 unlock_kernel();
926 return -EINVAL;
927 }
928 start = info->fix.mmio_start;
929 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
930 }
931 unlock_kernel();
932 start &= PAGE_MASK;
933 if ((vma->vm_end - vma->vm_start + off) > len)
934 return -EINVAL;
935 off += start;
936 vma->vm_pgoff = off >> PAGE_SHIFT;
937 /* This is an IO map - tell maydump to skip this VMA */
938 vma->vm_flags |= VM_IO | VM_RESERVED;
939 #if defined(__sparc_v9__)
940 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
941 vma->vm_end - vma->vm_start, vma->vm_page_prot))
942 return -EAGAIN;
943 #else
944 #if defined(__mc68000__)
945 #if defined(CONFIG_SUN3)
946 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
947 #elif defined(CONFIG_MMU)
948 if (CPU_IS_020_OR_030)
949 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
950 if (CPU_IS_040_OR_060) {
951 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
952 /* Use no-cache mode, serialized */
953 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
954 }
955 #endif
956 #elif defined(__powerpc__)
957 vma->vm_page_prot = phys_mem_access_prot(file, off,
958 vma->vm_end - vma->vm_start,
959 vma->vm_page_prot);
960 #elif defined(__alpha__)
961 /* Caching is off in the I/O space quadrant by design. */
962 #elif defined(__i386__) || defined(__x86_64__)
963 if (boot_cpu_data.x86 > 3)
964 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
965 #elif defined(__mips__)
966 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
967 #elif defined(__hppa__)
968 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
969 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
970 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
971 #elif defined(__ia64__)
972 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
973 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
974 else
975 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
976 #else
977 #warning What do we have to do here??
978 #endif
979 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
980 vma->vm_end - vma->vm_start, vma->vm_page_prot))
981 return -EAGAIN;
982 #endif /* !__sparc_v9__ */
983 return 0;
984 #endif /* !sparc32 */
985 }
986
987 static int
988 fb_open(struct inode *inode, struct file *file)
989 {
990 int fbidx = iminor(inode);
991 struct fb_info *info;
992 int res = 0;
993
994 if (fbidx >= FB_MAX)
995 return -ENODEV;
996 #ifdef CONFIG_KMOD
997 if (!(info = registered_fb[fbidx]))
998 try_to_load(fbidx);
999 #endif /* CONFIG_KMOD */
1000 if (!(info = registered_fb[fbidx]))
1001 return -ENODEV;
1002 if (!try_module_get(info->fbops->owner))
1003 return -ENODEV;
1004 if (info->fbops->fb_open) {
1005 res = info->fbops->fb_open(info,1);
1006 if (res)
1007 module_put(info->fbops->owner);
1008 }
1009 return res;
1010 }
1011
1012 static int
1013 fb_release(struct inode *inode, struct file *file)
1014 {
1015 int fbidx = iminor(inode);
1016 struct fb_info *info;
1017
1018 lock_kernel();
1019 info = registered_fb[fbidx];
1020 if (info->fbops->fb_release)
1021 info->fbops->fb_release(info,1);
1022 module_put(info->fbops->owner);
1023 unlock_kernel();
1024 return 0;
1025 }
1026
1027 static struct file_operations fb_fops = {
1028 .owner = THIS_MODULE,
1029 .read = fb_read,
1030 .write = fb_write,
1031 .ioctl = fb_ioctl,
1032 #ifdef CONFIG_COMPAT
1033 .compat_ioctl = fb_compat_ioctl,
1034 #endif
1035 .mmap = fb_mmap,
1036 .open = fb_open,
1037 .release = fb_release,
1038 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1039 .get_unmapped_area = get_fb_unmapped_area,
1040 #endif
1041 };
1042
1043 static struct class_simple *fb_class;
1044
1045 /**
1046 * register_framebuffer - registers a frame buffer device
1047 * @fb_info: frame buffer info structure
1048 *
1049 * Registers a frame buffer device @fb_info.
1050 *
1051 * Returns negative errno on error, or zero for success.
1052 *
1053 */
1054
1055 int
1056 register_framebuffer(struct fb_info *fb_info)
1057 {
1058 int i;
1059 struct fb_event event;
1060
1061 if (num_registered_fb == FB_MAX)
1062 return -ENXIO;
1063 num_registered_fb++;
1064 for (i = 0 ; i < FB_MAX; i++)
1065 if (!registered_fb[i])
1066 break;
1067 fb_info->node = i;
1068
1069 fb_info->class_device = class_simple_device_add(fb_class, MKDEV(FB_MAJOR, i),
1070 fb_info->device, "fb%d", i);
1071 if (IS_ERR(fb_info->class_device)) {
1072 /* Not fatal */
1073 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1074 fb_info->class_device = NULL;
1075 } else
1076 fb_init_class_device(fb_info);
1077
1078 if (fb_info->pixmap.addr == NULL) {
1079 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1080 if (fb_info->pixmap.addr) {
1081 fb_info->pixmap.size = FBPIXMAPSIZE;
1082 fb_info->pixmap.buf_align = 1;
1083 fb_info->pixmap.scan_align = 1;
1084 fb_info->pixmap.access_align = 4;
1085 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1086 }
1087 }
1088 fb_info->pixmap.offset = 0;
1089
1090 if (!fb_info->modelist.prev ||
1091 !fb_info->modelist.next ||
1092 list_empty(&fb_info->modelist)) {
1093 struct fb_videomode mode;
1094
1095 INIT_LIST_HEAD(&fb_info->modelist);
1096 fb_var_to_videomode(&mode, &fb_info->var);
1097 fb_add_videomode(&mode, &fb_info->modelist);
1098 }
1099
1100 registered_fb[i] = fb_info;
1101
1102 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1103 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1104 event.info = fb_info;
1105 notifier_call_chain(&fb_notifier_list,
1106 FB_EVENT_FB_REGISTERED, &event);
1107 return 0;
1108 }
1109
1110
1111 /**
1112 * unregister_framebuffer - releases a frame buffer device
1113 * @fb_info: frame buffer info structure
1114 *
1115 * Unregisters a frame buffer device @fb_info.
1116 *
1117 * Returns negative errno on error, or zero for success.
1118 *
1119 */
1120
1121 int
1122 unregister_framebuffer(struct fb_info *fb_info)
1123 {
1124 int i;
1125
1126 i = fb_info->node;
1127 if (!registered_fb[i])
1128 return -EINVAL;
1129 devfs_remove("fb/%d", i);
1130
1131 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1132 kfree(fb_info->pixmap.addr);
1133 fb_destroy_modelist(&fb_info->modelist);
1134 registered_fb[i]=NULL;
1135 num_registered_fb--;
1136 fb_cleanup_class_device(fb_info);
1137 class_simple_device_remove(MKDEV(FB_MAJOR, i));
1138 return 0;
1139 }
1140
1141 /**
1142 * fb_register_client - register a client notifier
1143 * @nb: notifier block to callback on events
1144 */
1145 int fb_register_client(struct notifier_block *nb)
1146 {
1147 return notifier_chain_register(&fb_notifier_list, nb);
1148 }
1149
1150 /**
1151 * fb_unregister_client - unregister a client notifier
1152 * @nb: notifier block to callback on events
1153 */
1154 int fb_unregister_client(struct notifier_block *nb)
1155 {
1156 return notifier_chain_unregister(&fb_notifier_list, nb);
1157 }
1158
1159 /**
1160 * fb_set_suspend - low level driver signals suspend
1161 * @info: framebuffer affected
1162 * @state: 0 = resuming, !=0 = suspending
1163 *
1164 * This is meant to be used by low level drivers to
1165 * signal suspend/resume to the core & clients.
1166 * It must be called with the console semaphore held
1167 */
1168 void fb_set_suspend(struct fb_info *info, int state)
1169 {
1170 struct fb_event event;
1171
1172 event.info = info;
1173 if (state) {
1174 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1175 info->state = FBINFO_STATE_SUSPENDED;
1176 } else {
1177 info->state = FBINFO_STATE_RUNNING;
1178 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1179 }
1180 }
1181
1182 /**
1183 * fbmem_init - init frame buffer subsystem
1184 *
1185 * Initialize the frame buffer subsystem.
1186 *
1187 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1188 *
1189 */
1190
1191 static int __init
1192 fbmem_init(void)
1193 {
1194 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1195
1196 devfs_mk_dir("fb");
1197 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1198 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1199
1200 fb_class = class_simple_create(THIS_MODULE, "graphics");
1201 if (IS_ERR(fb_class)) {
1202 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1203 fb_class = NULL;
1204 }
1205 return 0;
1206 }
1207
1208 #ifdef MODULE
1209 module_init(fbmem_init);
1210 static void __exit
1211 fbmem_exit(void)
1212 {
1213 class_simple_destroy(fb_class);
1214 }
1215
1216 module_exit(fbmem_exit);
1217 MODULE_LICENSE("GPL");
1218 MODULE_DESCRIPTION("Framebuffer base");
1219 #else
1220 subsys_initcall(fbmem_init);
1221 #endif
1222
1223 int fb_new_modelist(struct fb_info *info)
1224 {
1225 struct fb_event event;
1226 struct fb_var_screeninfo var = info->var;
1227 struct list_head *pos, *n;
1228 struct fb_modelist *modelist;
1229 struct fb_videomode *m, mode;
1230 int err = 1;
1231
1232 list_for_each_safe(pos, n, &info->modelist) {
1233 modelist = list_entry(pos, struct fb_modelist, list);
1234 m = &modelist->mode;
1235 fb_videomode_to_var(&var, m);
1236 var.activate = FB_ACTIVATE_TEST;
1237 err = fb_set_var(info, &var);
1238 fb_var_to_videomode(&mode, &var);
1239 if (err || !fb_mode_is_equal(m, &mode)) {
1240 list_del(pos);
1241 kfree(pos);
1242 }
1243 }
1244
1245 err = 1;
1246
1247 if (!list_empty(&info->modelist)) {
1248 event.info = info;
1249 err = notifier_call_chain(&fb_notifier_list,
1250 FB_EVENT_NEW_MODELIST,
1251 &event);
1252 }
1253
1254 return err;
1255 }
1256
1257 static char *video_options[FB_MAX];
1258 static int ofonly;
1259
1260 /**
1261 * fb_get_options - get kernel boot parameters
1262 * @name: framebuffer name as it would appear in
1263 * the boot parameter line
1264 * (video=<name>:<options>)
1265 * @option: the option will be stored here
1266 *
1267 * NOTE: Needed to maintain backwards compatibility
1268 */
1269 int fb_get_options(char *name, char **option)
1270 {
1271 char *opt, *options = NULL;
1272 int opt_len, retval = 0;
1273 int name_len = strlen(name), i;
1274
1275 if (name_len && ofonly && strncmp(name, "offb", 4))
1276 retval = 1;
1277
1278 if (name_len && !retval) {
1279 for (i = 0; i < FB_MAX; i++) {
1280 if (video_options[i] == NULL)
1281 continue;
1282 opt_len = strlen(video_options[i]);
1283 if (!opt_len)
1284 continue;
1285 opt = video_options[i];
1286 if (!strncmp(name, opt, name_len) &&
1287 opt[name_len] == ':')
1288 options = opt + name_len + 1;
1289 }
1290 }
1291 if (options && !strncmp(options, "off", 3))
1292 retval = 1;
1293
1294 if (option)
1295 *option = options;
1296
1297 return retval;
1298 }
1299
1300
1301 extern const char *global_mode_option;
1302
1303 /**
1304 * video_setup - process command line options
1305 * @options: string of options
1306 *
1307 * Process command line options for frame buffer subsystem.
1308 *
1309 * NOTE: This function is a __setup and __init function.
1310 * It only stores the options. Drivers have to call
1311 * fb_get_options() as necessary.
1312 *
1313 * Returns zero.
1314 *
1315 */
1316 int __init video_setup(char *options)
1317 {
1318 int i, global = 0;
1319
1320 if (!options || !*options)
1321 global = 1;
1322
1323 if (!global && !strncmp(options, "ofonly", 6)) {
1324 ofonly = 1;
1325 global = 1;
1326 }
1327
1328 if (!global && !strstr(options, "fb:")) {
1329 global_mode_option = options;
1330 global = 1;
1331 }
1332
1333 if (!global) {
1334 for (i = 0; i < FB_MAX; i++) {
1335 if (video_options[i] == NULL) {
1336 video_options[i] = options;
1337 break;
1338 }
1339
1340 }
1341 }
1342
1343 return 0;
1344 }
1345 __setup("video=", video_setup);
1346
1347 /*
1348 * Visible symbols for modules
1349 */
1350
1351 EXPORT_SYMBOL(register_framebuffer);
1352 EXPORT_SYMBOL(unregister_framebuffer);
1353 EXPORT_SYMBOL(num_registered_fb);
1354 EXPORT_SYMBOL(registered_fb);
1355 EXPORT_SYMBOL(fb_prepare_logo);
1356 EXPORT_SYMBOL(fb_show_logo);
1357 EXPORT_SYMBOL(fb_set_var);
1358 EXPORT_SYMBOL(fb_blank);
1359 EXPORT_SYMBOL(fb_pan_display);
1360 EXPORT_SYMBOL(fb_get_buffer_offset);
1361 EXPORT_SYMBOL(fb_iomove_buf_unaligned);
1362 EXPORT_SYMBOL(fb_iomove_buf_aligned);
1363 EXPORT_SYMBOL(fb_sysmove_buf_unaligned);
1364 EXPORT_SYMBOL(fb_sysmove_buf_aligned);
1365 EXPORT_SYMBOL(fb_set_suspend);
1366 EXPORT_SYMBOL(fb_register_client);
1367 EXPORT_SYMBOL(fb_unregister_client);
1368 EXPORT_SYMBOL(fb_get_options);
1369 EXPORT_SYMBOL(fb_new_modelist);
1370
1371 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree