2 * linux/drivers/video/fbmem.c
4 * Copyright (C) 1994 Martin Schaller
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
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
14 #include <linux/module.h>
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/major.h>
21 #include <linux/slab.h>
23 #include <linux/mman.h>
25 #include <linux/init.h>
26 #include <linux/linux_logo.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/console.h>
30 #include <linux/kmod.h>
31 #include <linux/err.h>
32 #include <linux/device.h>
33 #include <linux/efi.h>
40 * Frame buffer device initialization and setup routines
43 #define FBPIXMAPSIZE (1024 * 8)
45 static DEFINE_MUTEX(registration_lock
);
46 struct fb_info
*registered_fb
[FB_MAX
] __read_mostly
;
47 int num_registered_fb __read_mostly
;
49 static struct fb_info
*get_fb_info(unsigned int idx
)
51 struct fb_info
*fb_info
;
54 return ERR_PTR(-ENODEV
);
56 mutex_lock(®istration_lock
);
57 fb_info
= registered_fb
[idx
];
59 atomic_inc(&fb_info
->count
);
60 mutex_unlock(®istration_lock
);
65 static void put_fb_info(struct fb_info
*fb_info
)
67 if (!atomic_dec_and_test(&fb_info
->count
))
69 if (fb_info
->fbops
->fb_destroy
)
70 fb_info
->fbops
->fb_destroy(fb_info
);
73 int lock_fb_info(struct fb_info
*info
)
75 mutex_lock(&info
->lock
);
77 mutex_unlock(&info
->lock
);
82 EXPORT_SYMBOL(lock_fb_info
);
88 int fb_get_color_depth(struct fb_var_screeninfo
*var
,
89 struct fb_fix_screeninfo
*fix
)
93 if (fix
->visual
== FB_VISUAL_MONO01
||
94 fix
->visual
== FB_VISUAL_MONO10
)
97 if (var
->green
.length
== var
->blue
.length
&&
98 var
->green
.length
== var
->red
.length
&&
99 var
->green
.offset
== var
->blue
.offset
&&
100 var
->green
.offset
== var
->red
.offset
)
101 depth
= var
->green
.length
;
103 depth
= var
->green
.length
+ var
->red
.length
+
109 EXPORT_SYMBOL(fb_get_color_depth
);
112 * Data padding functions.
114 void fb_pad_aligned_buffer(u8
*dst
, u32 d_pitch
, u8
*src
, u32 s_pitch
, u32 height
)
116 __fb_pad_aligned_buffer(dst
, d_pitch
, src
, s_pitch
, height
);
118 EXPORT_SYMBOL(fb_pad_aligned_buffer
);
120 void fb_pad_unaligned_buffer(u8
*dst
, u32 d_pitch
, u8
*src
, u32 idx
, u32 height
,
121 u32 shift_high
, u32 shift_low
, u32 mod
)
123 u8 mask
= (u8
) (0xfff << shift_high
), tmp
;
126 for (i
= height
; i
--; ) {
127 for (j
= 0; j
< idx
; j
++) {
130 tmp
|= *src
>> shift_low
;
132 tmp
= *src
<< shift_high
;
138 tmp
|= *src
>> shift_low
;
140 if (shift_high
< mod
) {
141 tmp
= *src
<< shift_high
;
148 EXPORT_SYMBOL(fb_pad_unaligned_buffer
);
151 * we need to lock this section since fb_cursor
152 * may use fb_imageblit()
154 char* fb_get_buffer_offset(struct fb_info
*info
, struct fb_pixmap
*buf
, u32 size
)
156 u32 align
= buf
->buf_align
- 1, offset
;
157 char *addr
= buf
->addr
;
159 /* If IO mapped, we need to sync before access, no sharing of
162 if (buf
->flags
& FB_PIXMAP_IO
) {
163 if (info
->fbops
->fb_sync
&& (buf
->flags
& FB_PIXMAP_SYNC
))
164 info
->fbops
->fb_sync(info
);
168 /* See if we fit in the remaining pixmap space */
169 offset
= buf
->offset
+ align
;
171 if (offset
+ size
> buf
->size
) {
172 /* We do not fit. In order to be able to re-use the buffer,
173 * we must ensure no asynchronous DMA'ing or whatever operation
174 * is in progress, we sync for that.
176 if (info
->fbops
->fb_sync
&& (buf
->flags
& FB_PIXMAP_SYNC
))
177 info
->fbops
->fb_sync(info
);
180 buf
->offset
= offset
+ size
;
188 static inline unsigned safe_shift(unsigned d
, int n
)
190 return n
< 0 ? d
>> -n
: d
<< n
;
193 static void fb_set_logocmap(struct fb_info
*info
,
194 const struct linux_logo
*logo
)
196 struct fb_cmap palette_cmap
;
197 u16 palette_green
[16];
198 u16 palette_blue
[16];
201 const unsigned char *clut
= logo
->clut
;
203 palette_cmap
.start
= 0;
204 palette_cmap
.len
= 16;
205 palette_cmap
.red
= palette_red
;
206 palette_cmap
.green
= palette_green
;
207 palette_cmap
.blue
= palette_blue
;
208 palette_cmap
.transp
= NULL
;
210 for (i
= 0; i
< logo
->clutsize
; i
+= n
) {
211 n
= logo
->clutsize
- i
;
212 /* palette_cmap provides space for only 16 colors at once */
215 palette_cmap
.start
= 32 + i
;
216 palette_cmap
.len
= n
;
217 for (j
= 0; j
< n
; ++j
) {
218 palette_cmap
.red
[j
] = clut
[0] << 8 | clut
[0];
219 palette_cmap
.green
[j
] = clut
[1] << 8 | clut
[1];
220 palette_cmap
.blue
[j
] = clut
[2] << 8 | clut
[2];
223 fb_set_cmap(&palette_cmap
, info
);
227 static void fb_set_logo_truepalette(struct fb_info
*info
,
228 const struct linux_logo
*logo
,
231 static const unsigned char mask
[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
232 unsigned char redmask
, greenmask
, bluemask
;
233 int redshift
, greenshift
, blueshift
;
235 const unsigned char *clut
= logo
->clut
;
238 * We have to create a temporary palette since console palette is only
241 /* Bug: Doesn't obey msb_right ... (who needs that?) */
242 redmask
= mask
[info
->var
.red
.length
< 8 ? info
->var
.red
.length
: 8];
243 greenmask
= mask
[info
->var
.green
.length
< 8 ? info
->var
.green
.length
: 8];
244 bluemask
= mask
[info
->var
.blue
.length
< 8 ? info
->var
.blue
.length
: 8];
245 redshift
= info
->var
.red
.offset
- (8 - info
->var
.red
.length
);
246 greenshift
= info
->var
.green
.offset
- (8 - info
->var
.green
.length
);
247 blueshift
= info
->var
.blue
.offset
- (8 - info
->var
.blue
.length
);
249 for ( i
= 0; i
< logo
->clutsize
; i
++) {
250 palette
[i
+32] = (safe_shift((clut
[0] & redmask
), redshift
) |
251 safe_shift((clut
[1] & greenmask
), greenshift
) |
252 safe_shift((clut
[2] & bluemask
), blueshift
));
257 static void fb_set_logo_directpalette(struct fb_info
*info
,
258 const struct linux_logo
*logo
,
261 int redshift
, greenshift
, blueshift
;
264 redshift
= info
->var
.red
.offset
;
265 greenshift
= info
->var
.green
.offset
;
266 blueshift
= info
->var
.blue
.offset
;
268 for (i
= 32; i
< 32 + logo
->clutsize
; i
++)
269 palette
[i
] = i
<< redshift
| i
<< greenshift
| i
<< blueshift
;
272 static void fb_set_logo(struct fb_info
*info
,
273 const struct linux_logo
*logo
, u8
*dst
,
277 const u8
*src
= logo
->data
;
278 u8
xor = (info
->fix
.visual
== FB_VISUAL_MONO01
) ? 0xff : 0;
281 switch (fb_get_color_depth(&info
->var
, &info
->fix
)) {
293 if (info
->fix
.visual
== FB_VISUAL_MONO01
||
294 info
->fix
.visual
== FB_VISUAL_MONO10
)
295 fg
= ~((u8
) (0xfff << info
->var
.green
.length
));
299 for (i
= 0; i
< logo
->height
; i
++)
300 for (j
= 0; j
< logo
->width
; src
++) {
303 if (j
< logo
->width
) {
304 *dst
++ = *src
& 0x0f;
310 for (i
= 0; i
< logo
->height
; i
++) {
311 for (j
= 0; j
< logo
->width
; src
++) {
313 for (k
= 7; k
>= 0; k
--) {
314 *dst
++ = ((d
>> k
) & 1) ? fg
: 0;
324 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
325 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
326 * the visual format and color depth of the framebuffer, the DAC, the
327 * pseudo_palette, and the logo data will be adjusted accordingly.
329 * Case 1 - linux_logo_clut224:
330 * Color exceeds the number of console colors (16), thus we set the hardware DAC
331 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
333 * For visuals that require color info from the pseudo_palette, we also construct
334 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
337 * Case 2 - linux_logo_vga16:
338 * The number of colors just matches the console colors, thus there is no need
339 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
340 * each byte contains color information for two pixels (upper and lower nibble).
341 * To be consistent with fb_imageblit() usage, we therefore separate the two
342 * nibbles into separate bytes. The "depth" flag will be set to 4.
344 * Case 3 - linux_logo_mono:
345 * This is similar with Case 2. Each byte contains information for 8 pixels.
346 * We isolate each bit and expand each into a byte. The "depth" flag will
349 static struct logo_data
{
351 int needs_directpalette
;
352 int needs_truepalette
;
354 const struct linux_logo
*logo
;
355 } fb_logo __read_mostly
;
357 static void fb_rotate_logo_ud(const u8
*in
, u8
*out
, u32 width
, u32 height
)
359 u32 size
= width
* height
, i
;
363 for (i
= size
; i
--; )
367 static void fb_rotate_logo_cw(const u8
*in
, u8
*out
, u32 width
, u32 height
)
369 int i
, j
, h
= height
- 1;
371 for (i
= 0; i
< height
; i
++)
372 for (j
= 0; j
< width
; j
++)
373 out
[height
* j
+ h
- i
] = *in
++;
376 static void fb_rotate_logo_ccw(const u8
*in
, u8
*out
, u32 width
, u32 height
)
378 int i
, j
, w
= width
- 1;
380 for (i
= 0; i
< height
; i
++)
381 for (j
= 0; j
< width
; j
++)
382 out
[height
* (w
- j
) + i
] = *in
++;
385 static void fb_rotate_logo(struct fb_info
*info
, u8
*dst
,
386 struct fb_image
*image
, int rotate
)
390 if (rotate
== FB_ROTATE_UD
) {
391 fb_rotate_logo_ud(image
->data
, dst
, image
->width
,
393 image
->dx
= info
->var
.xres
- image
->width
- image
->dx
;
394 image
->dy
= info
->var
.yres
- image
->height
- image
->dy
;
395 } else if (rotate
== FB_ROTATE_CW
) {
396 fb_rotate_logo_cw(image
->data
, dst
, image
->width
,
399 image
->width
= image
->height
;
402 image
->dy
= image
->dx
;
403 image
->dx
= info
->var
.xres
- image
->width
- tmp
;
404 } else if (rotate
== FB_ROTATE_CCW
) {
405 fb_rotate_logo_ccw(image
->data
, dst
, image
->width
,
408 image
->width
= image
->height
;
411 image
->dx
= image
->dy
;
412 image
->dy
= info
->var
.yres
- image
->height
- tmp
;
418 static void fb_do_show_logo(struct fb_info
*info
, struct fb_image
*image
,
419 int rotate
, unsigned int num
)
423 if (rotate
== FB_ROTATE_UR
) {
425 x
< num
&& image
->dx
+ image
->width
<= info
->var
.xres
;
427 info
->fbops
->fb_imageblit(info
, image
);
428 image
->dx
+= image
->width
+ 8;
430 } else if (rotate
== FB_ROTATE_UD
) {
431 for (x
= 0; x
< num
&& image
->dx
>= 0; x
++) {
432 info
->fbops
->fb_imageblit(info
, image
);
433 image
->dx
-= image
->width
+ 8;
435 } else if (rotate
== FB_ROTATE_CW
) {
437 x
< num
&& image
->dy
+ image
->height
<= info
->var
.yres
;
439 info
->fbops
->fb_imageblit(info
, image
);
440 image
->dy
+= image
->height
+ 8;
442 } else if (rotate
== FB_ROTATE_CCW
) {
443 for (x
= 0; x
< num
&& image
->dy
>= 0; x
++) {
444 info
->fbops
->fb_imageblit(info
, image
);
445 image
->dy
-= image
->height
+ 8;
450 static int fb_show_logo_line(struct fb_info
*info
, int rotate
,
451 const struct linux_logo
*logo
, int y
,
454 u32
*palette
= NULL
, *saved_pseudo_palette
= NULL
;
455 unsigned char *logo_new
= NULL
, *logo_rotate
= NULL
;
456 struct fb_image image
;
458 /* Return if the frame buffer is not mapped or suspended */
459 if (logo
== NULL
|| info
->state
!= FBINFO_STATE_RUNNING
||
460 info
->flags
& FBINFO_MODULE
)
464 image
.data
= logo
->data
;
466 if (fb_logo
.needs_cmapreset
)
467 fb_set_logocmap(info
, logo
);
469 if (fb_logo
.needs_truepalette
||
470 fb_logo
.needs_directpalette
) {
471 palette
= kmalloc(256 * 4, GFP_KERNEL
);
475 if (fb_logo
.needs_truepalette
)
476 fb_set_logo_truepalette(info
, logo
, palette
);
478 fb_set_logo_directpalette(info
, logo
, palette
);
480 saved_pseudo_palette
= info
->pseudo_palette
;
481 info
->pseudo_palette
= palette
;
484 if (fb_logo
.depth
<= 4) {
485 logo_new
= kmalloc(logo
->width
* logo
->height
, GFP_KERNEL
);
486 if (logo_new
== NULL
) {
488 if (saved_pseudo_palette
)
489 info
->pseudo_palette
= saved_pseudo_palette
;
492 image
.data
= logo_new
;
493 fb_set_logo(info
, logo
, logo_new
, fb_logo
.depth
);
498 image
.width
= logo
->width
;
499 image
.height
= logo
->height
;
502 logo_rotate
= kmalloc(logo
->width
*
503 logo
->height
, GFP_KERNEL
);
505 fb_rotate_logo(info
, logo_rotate
, &image
, rotate
);
508 fb_do_show_logo(info
, &image
, rotate
, n
);
511 if (saved_pseudo_palette
!= NULL
)
512 info
->pseudo_palette
= saved_pseudo_palette
;
519 #ifdef CONFIG_FB_LOGO_EXTRA
521 #define FB_LOGO_EX_NUM_MAX 10
522 static struct logo_data_extra
{
523 const struct linux_logo
*logo
;
525 } fb_logo_ex
[FB_LOGO_EX_NUM_MAX
];
526 static unsigned int fb_logo_ex_num
;
528 void fb_append_extra_logo(const struct linux_logo
*logo
, unsigned int n
)
530 if (!n
|| fb_logo_ex_num
== FB_LOGO_EX_NUM_MAX
)
533 fb_logo_ex
[fb_logo_ex_num
].logo
= logo
;
534 fb_logo_ex
[fb_logo_ex_num
].n
= n
;
538 static int fb_prepare_extra_logos(struct fb_info
*info
, unsigned int height
,
543 /* FIXME: logo_ex supports only truecolor fb. */
544 if (info
->fix
.visual
!= FB_VISUAL_TRUECOLOR
)
547 for (i
= 0; i
< fb_logo_ex_num
; i
++) {
548 if (fb_logo_ex
[i
].logo
->type
!= fb_logo
.logo
->type
) {
549 fb_logo_ex
[i
].logo
= NULL
;
552 height
+= fb_logo_ex
[i
].logo
->height
;
554 height
-= fb_logo_ex
[i
].logo
->height
;
562 static int fb_show_extra_logos(struct fb_info
*info
, int y
, int rotate
)
566 for (i
= 0; i
< fb_logo_ex_num
; i
++)
567 y
+= fb_show_logo_line(info
, rotate
,
568 fb_logo_ex
[i
].logo
, y
, fb_logo_ex
[i
].n
);
573 #else /* !CONFIG_FB_LOGO_EXTRA */
575 static inline int fb_prepare_extra_logos(struct fb_info
*info
,
582 static inline int fb_show_extra_logos(struct fb_info
*info
, int y
, int rotate
)
587 #endif /* CONFIG_FB_LOGO_EXTRA */
590 int fb_prepare_logo(struct fb_info
*info
, int rotate
)
592 int depth
= fb_get_color_depth(&info
->var
, &info
->fix
);
595 memset(&fb_logo
, 0, sizeof(struct logo_data
));
597 if (info
->flags
& FBINFO_MISC_TILEBLITTING
||
598 info
->flags
& FBINFO_MODULE
)
601 if (info
->fix
.visual
== FB_VISUAL_DIRECTCOLOR
) {
602 depth
= info
->var
.blue
.length
;
603 if (info
->var
.red
.length
< depth
)
604 depth
= info
->var
.red
.length
;
605 if (info
->var
.green
.length
< depth
)
606 depth
= info
->var
.green
.length
;
609 if (info
->fix
.visual
== FB_VISUAL_STATIC_PSEUDOCOLOR
&& depth
> 4) {
610 /* assume console colormap */
614 /* Return if no suitable logo was found */
615 fb_logo
.logo
= fb_find_logo(depth
);
621 if (rotate
== FB_ROTATE_UR
|| rotate
== FB_ROTATE_UD
)
622 yres
= info
->var
.yres
;
624 yres
= info
->var
.xres
;
626 if (fb_logo
.logo
->height
> yres
) {
631 /* What depth we asked for might be different from what we get */
632 if (fb_logo
.logo
->type
== LINUX_LOGO_CLUT224
)
634 else if (fb_logo
.logo
->type
== LINUX_LOGO_VGA16
)
640 if (fb_logo
.depth
> 4 && depth
> 4) {
641 switch (info
->fix
.visual
) {
642 case FB_VISUAL_TRUECOLOR
:
643 fb_logo
.needs_truepalette
= 1;
645 case FB_VISUAL_DIRECTCOLOR
:
646 fb_logo
.needs_directpalette
= 1;
647 fb_logo
.needs_cmapreset
= 1;
649 case FB_VISUAL_PSEUDOCOLOR
:
650 fb_logo
.needs_cmapreset
= 1;
655 return fb_prepare_extra_logos(info
, fb_logo
.logo
->height
, yres
);
658 int fb_show_logo(struct fb_info
*info
, int rotate
)
662 y
= fb_show_logo_line(info
, rotate
, fb_logo
.logo
, 0,
664 y
= fb_show_extra_logos(info
, y
, rotate
);
669 int fb_prepare_logo(struct fb_info
*info
, int rotate
) { return 0; }
670 int fb_show_logo(struct fb_info
*info
, int rotate
) { return 0; }
671 #endif /* CONFIG_LOGO */
673 static void *fb_seq_start(struct seq_file
*m
, loff_t
*pos
)
675 mutex_lock(®istration_lock
);
676 return (*pos
< FB_MAX
) ? pos
: NULL
;
679 static void *fb_seq_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
682 return (*pos
< FB_MAX
) ? pos
: NULL
;
685 static void fb_seq_stop(struct seq_file
*m
, void *v
)
687 mutex_unlock(®istration_lock
);
690 static int fb_seq_show(struct seq_file
*m
, void *v
)
692 int i
= *(loff_t
*)v
;
693 struct fb_info
*fi
= registered_fb
[i
];
696 seq_printf(m
, "%d %s\n", fi
->node
, fi
->fix
.id
);
700 static const struct seq_operations proc_fb_seq_ops
= {
701 .start
= fb_seq_start
,
707 static int proc_fb_open(struct inode
*inode
, struct file
*file
)
709 return seq_open(file
, &proc_fb_seq_ops
);
712 static const struct file_operations fb_proc_fops
= {
713 .owner
= THIS_MODULE
,
714 .open
= proc_fb_open
,
717 .release
= seq_release
,
721 * We hold a reference to the fb_info in file->private_data,
722 * but if the current registered fb has changed, we don't
723 * actually want to use it.
725 * So look up the fb_info using the inode minor number,
726 * and just verify it against the reference we have.
728 static struct fb_info
*file_fb_info(struct file
*file
)
730 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
731 int fbidx
= iminor(inode
);
732 struct fb_info
*info
= registered_fb
[fbidx
];
734 if (info
!= file
->private_data
)
740 fb_read(struct file
*file
, char __user
*buf
, size_t count
, loff_t
*ppos
)
742 unsigned long p
= *ppos
;
743 struct fb_info
*info
= file_fb_info(file
);
746 int c
, cnt
= 0, err
= 0;
747 unsigned long total_size
;
749 if (!info
|| ! info
->screen_base
)
752 if (info
->state
!= FBINFO_STATE_RUNNING
)
755 if (info
->fbops
->fb_read
)
756 return info
->fbops
->fb_read(info
, buf
, count
, ppos
);
758 total_size
= info
->screen_size
;
761 total_size
= info
->fix
.smem_len
;
766 if (count
>= total_size
)
769 if (count
+ p
> total_size
)
770 count
= total_size
- p
;
772 buffer
= kmalloc((count
> PAGE_SIZE
) ? PAGE_SIZE
: count
,
777 src
= (u8 __iomem
*) (info
->screen_base
+ p
);
779 if (info
->fbops
->fb_sync
)
780 info
->fbops
->fb_sync(info
);
783 c
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
785 fb_memcpy_fromfb(dst
, src
, c
);
789 if (copy_to_user(buf
, buffer
, c
)) {
801 return (err
) ? err
: cnt
;
805 fb_write(struct file
*file
, const char __user
*buf
, size_t count
, loff_t
*ppos
)
807 unsigned long p
= *ppos
;
808 struct fb_info
*info
= file_fb_info(file
);
811 int c
, cnt
= 0, err
= 0;
812 unsigned long total_size
;
814 if (!info
|| !info
->screen_base
)
817 if (info
->state
!= FBINFO_STATE_RUNNING
)
820 if (info
->fbops
->fb_write
)
821 return info
->fbops
->fb_write(info
, buf
, count
, ppos
);
823 total_size
= info
->screen_size
;
826 total_size
= info
->fix
.smem_len
;
831 if (count
> total_size
) {
836 if (count
+ p
> total_size
) {
840 count
= total_size
- p
;
843 buffer
= kmalloc((count
> PAGE_SIZE
) ? PAGE_SIZE
: count
,
848 dst
= (u8 __iomem
*) (info
->screen_base
+ p
);
850 if (info
->fbops
->fb_sync
)
851 info
->fbops
->fb_sync(info
);
854 c
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
857 if (copy_from_user(src
, buf
, c
)) {
862 fb_memcpy_tofb(dst
, src
, c
);
873 return (cnt
) ? cnt
: err
;
877 fb_pan_display(struct fb_info
*info
, struct fb_var_screeninfo
*var
)
879 struct fb_fix_screeninfo
*fix
= &info
->fix
;
880 unsigned int yres
= info
->var
.yres
;
883 if (var
->yoffset
> 0) {
884 if (var
->vmode
& FB_VMODE_YWRAP
) {
885 if (!fix
->ywrapstep
|| (var
->yoffset
% fix
->ywrapstep
))
889 } else if (!fix
->ypanstep
|| (var
->yoffset
% fix
->ypanstep
))
893 if (var
->xoffset
> 0 && (!fix
->xpanstep
||
894 (var
->xoffset
% fix
->xpanstep
)))
897 if (err
|| !info
->fbops
->fb_pan_display
||
898 var
->yoffset
> info
->var
.yres_virtual
- yres
||
899 var
->xoffset
> info
->var
.xres_virtual
- info
->var
.xres
)
902 if ((err
= info
->fbops
->fb_pan_display(var
, info
)))
904 info
->var
.xoffset
= var
->xoffset
;
905 info
->var
.yoffset
= var
->yoffset
;
906 if (var
->vmode
& FB_VMODE_YWRAP
)
907 info
->var
.vmode
|= FB_VMODE_YWRAP
;
909 info
->var
.vmode
&= ~FB_VMODE_YWRAP
;
913 static int fb_check_caps(struct fb_info
*info
, struct fb_var_screeninfo
*var
,
916 struct fb_event event
;
917 struct fb_blit_caps caps
, fbcaps
;
920 memset(&caps
, 0, sizeof(caps
));
921 memset(&fbcaps
, 0, sizeof(fbcaps
));
922 caps
.flags
= (activate
& FB_ACTIVATE_ALL
) ? 1 : 0;
925 fb_notifier_call_chain(FB_EVENT_GET_REQ
, &event
);
926 info
->fbops
->fb_get_caps(info
, &fbcaps
, var
);
928 if (((fbcaps
.x
^ caps
.x
) & caps
.x
) ||
929 ((fbcaps
.y
^ caps
.y
) & caps
.y
) ||
930 (fbcaps
.len
< caps
.len
))
937 fb_set_var(struct fb_info
*info
, struct fb_var_screeninfo
*var
)
939 int flags
= info
->flags
;
942 if (var
->activate
& FB_ACTIVATE_INV_MODE
) {
943 struct fb_videomode mode1
, mode2
;
945 fb_var_to_videomode(&mode1
, var
);
946 fb_var_to_videomode(&mode2
, &info
->var
);
947 /* make sure we don't delete the videomode of current var */
948 ret
= fb_mode_is_equal(&mode1
, &mode2
);
951 struct fb_event event
;
955 ret
= fb_notifier_call_chain(FB_EVENT_MODE_DELETE
, &event
);
959 fb_delete_videomode(&mode1
, &info
->modelist
);
962 ret
= (ret
) ? -EINVAL
: 0;
966 if ((var
->activate
& FB_ACTIVATE_FORCE
) ||
967 memcmp(&info
->var
, var
, sizeof(struct fb_var_screeninfo
))) {
968 u32 activate
= var
->activate
;
970 if (!info
->fbops
->fb_check_var
) {
975 ret
= info
->fbops
->fb_check_var(var
, info
);
980 if ((var
->activate
& FB_ACTIVATE_MASK
) == FB_ACTIVATE_NOW
) {
981 struct fb_var_screeninfo old_var
;
982 struct fb_videomode mode
;
984 if (info
->fbops
->fb_get_caps
) {
985 ret
= fb_check_caps(info
, var
, activate
);
994 if (info
->fbops
->fb_set_par
) {
995 ret
= info
->fbops
->fb_set_par(info
);
999 printk(KERN_WARNING
"detected "
1000 "fb_set_par error, "
1001 "error code: %d\n", ret
);
1006 fb_pan_display(info
, &info
->var
);
1007 fb_set_cmap(&info
->cmap
, info
);
1008 fb_var_to_videomode(&mode
, &info
->var
);
1010 if (info
->modelist
.prev
&& info
->modelist
.next
&&
1011 !list_empty(&info
->modelist
))
1012 ret
= fb_add_videomode(&mode
, &info
->modelist
);
1014 if (!ret
&& (flags
& FBINFO_MISC_USEREVENT
)) {
1015 struct fb_event event
;
1016 int evnt
= (activate
& FB_ACTIVATE_ALL
) ?
1017 FB_EVENT_MODE_CHANGE_ALL
:
1018 FB_EVENT_MODE_CHANGE
;
1020 info
->flags
&= ~FBINFO_MISC_USEREVENT
;
1023 fb_notifier_call_chain(evnt
, &event
);
1033 fb_blank(struct fb_info
*info
, int blank
)
1037 if (blank
> FB_BLANK_POWERDOWN
)
1038 blank
= FB_BLANK_POWERDOWN
;
1040 if (info
->fbops
->fb_blank
)
1041 ret
= info
->fbops
->fb_blank(blank
, info
);
1044 struct fb_event event
;
1047 event
.data
= &blank
;
1048 fb_notifier_call_chain(FB_EVENT_BLANK
, &event
);
1054 static long do_fb_ioctl(struct fb_info
*info
, unsigned int cmd
,
1058 struct fb_var_screeninfo var
;
1059 struct fb_fix_screeninfo fix
;
1060 struct fb_con2fbmap con2fb
;
1061 struct fb_cmap cmap_from
;
1062 struct fb_cmap_user cmap
;
1063 struct fb_event event
;
1064 void __user
*argp
= (void __user
*)arg
;
1068 case FBIOGET_VSCREENINFO
:
1069 if (!lock_fb_info(info
))
1072 unlock_fb_info(info
);
1074 ret
= copy_to_user(argp
, &var
, sizeof(var
)) ? -EFAULT
: 0;
1076 case FBIOPUT_VSCREENINFO
:
1077 if (copy_from_user(&var
, argp
, sizeof(var
)))
1079 if (!lock_fb_info(info
))
1082 info
->flags
|= FBINFO_MISC_USEREVENT
;
1083 ret
= fb_set_var(info
, &var
);
1084 info
->flags
&= ~FBINFO_MISC_USEREVENT
;
1086 unlock_fb_info(info
);
1087 if (!ret
&& copy_to_user(argp
, &var
, sizeof(var
)))
1090 case FBIOGET_FSCREENINFO
:
1091 if (!lock_fb_info(info
))
1094 unlock_fb_info(info
);
1096 ret
= copy_to_user(argp
, &fix
, sizeof(fix
)) ? -EFAULT
: 0;
1099 if (copy_from_user(&cmap
, argp
, sizeof(cmap
)))
1101 ret
= fb_set_user_cmap(&cmap
, info
);
1104 if (copy_from_user(&cmap
, argp
, sizeof(cmap
)))
1106 if (!lock_fb_info(info
))
1108 cmap_from
= info
->cmap
;
1109 unlock_fb_info(info
);
1110 ret
= fb_cmap_to_user(&cmap_from
, &cmap
);
1112 case FBIOPAN_DISPLAY
:
1113 if (copy_from_user(&var
, argp
, sizeof(var
)))
1115 if (!lock_fb_info(info
))
1118 ret
= fb_pan_display(info
, &var
);
1120 unlock_fb_info(info
);
1121 if (ret
== 0 && copy_to_user(argp
, &var
, sizeof(var
)))
1127 case FBIOGET_CON2FBMAP
:
1128 if (copy_from_user(&con2fb
, argp
, sizeof(con2fb
)))
1130 if (con2fb
.console
< 1 || con2fb
.console
> MAX_NR_CONSOLES
)
1132 con2fb
.framebuffer
= -1;
1133 event
.data
= &con2fb
;
1134 if (!lock_fb_info(info
))
1137 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP
, &event
);
1138 unlock_fb_info(info
);
1139 ret
= copy_to_user(argp
, &con2fb
, sizeof(con2fb
)) ? -EFAULT
: 0;
1141 case FBIOPUT_CON2FBMAP
:
1142 if (copy_from_user(&con2fb
, argp
, sizeof(con2fb
)))
1144 if (con2fb
.console
< 1 || con2fb
.console
> MAX_NR_CONSOLES
)
1146 if (con2fb
.framebuffer
< 0 || con2fb
.framebuffer
>= FB_MAX
)
1148 if (!registered_fb
[con2fb
.framebuffer
])
1149 request_module("fb%d", con2fb
.framebuffer
);
1150 if (!registered_fb
[con2fb
.framebuffer
]) {
1154 event
.data
= &con2fb
;
1155 if (!lock_fb_info(info
))
1158 ret
= fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP
, &event
);
1159 unlock_fb_info(info
);
1162 if (!lock_fb_info(info
))
1165 info
->flags
|= FBINFO_MISC_USEREVENT
;
1166 ret
= fb_blank(info
, arg
);
1167 info
->flags
&= ~FBINFO_MISC_USEREVENT
;
1169 unlock_fb_info(info
);
1172 if (!lock_fb_info(info
))
1176 ret
= fb
->fb_ioctl(info
, cmd
, arg
);
1179 unlock_fb_info(info
);
1184 static long fb_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1186 struct fb_info
*info
= file_fb_info(file
);
1190 return do_fb_ioctl(info
, cmd
, arg
);
1193 #ifdef CONFIG_COMPAT
1194 struct fb_fix_screeninfo32
{
1196 compat_caddr_t smem_start
;
1205 compat_caddr_t mmio_start
;
1215 compat_caddr_t green
;
1216 compat_caddr_t blue
;
1217 compat_caddr_t transp
;
1220 static int fb_getput_cmap(struct fb_info
*info
, unsigned int cmd
,
1223 struct fb_cmap_user __user
*cmap
;
1224 struct fb_cmap32 __user
*cmap32
;
1228 cmap
= compat_alloc_user_space(sizeof(*cmap
));
1229 cmap32
= compat_ptr(arg
);
1231 if (copy_in_user(&cmap
->start
, &cmap32
->start
, 2 * sizeof(__u32
)))
1234 if (get_user(data
, &cmap32
->red
) ||
1235 put_user(compat_ptr(data
), &cmap
->red
) ||
1236 get_user(data
, &cmap32
->green
) ||
1237 put_user(compat_ptr(data
), &cmap
->green
) ||
1238 get_user(data
, &cmap32
->blue
) ||
1239 put_user(compat_ptr(data
), &cmap
->blue
) ||
1240 get_user(data
, &cmap32
->transp
) ||
1241 put_user(compat_ptr(data
), &cmap
->transp
))
1244 err
= do_fb_ioctl(info
, cmd
, (unsigned long) cmap
);
1247 if (copy_in_user(&cmap32
->start
,
1255 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo
*fix
,
1256 struct fb_fix_screeninfo32 __user
*fix32
)
1261 err
= copy_to_user(&fix32
->id
, &fix
->id
, sizeof(fix32
->id
));
1263 data
= (__u32
) (unsigned long) fix
->smem_start
;
1264 err
|= put_user(data
, &fix32
->smem_start
);
1266 err
|= put_user(fix
->smem_len
, &fix32
->smem_len
);
1267 err
|= put_user(fix
->type
, &fix32
->type
);
1268 err
|= put_user(fix
->type_aux
, &fix32
->type_aux
);
1269 err
|= put_user(fix
->visual
, &fix32
->visual
);
1270 err
|= put_user(fix
->xpanstep
, &fix32
->xpanstep
);
1271 err
|= put_user(fix
->ypanstep
, &fix32
->ypanstep
);
1272 err
|= put_user(fix
->ywrapstep
, &fix32
->ywrapstep
);
1273 err
|= put_user(fix
->line_length
, &fix32
->line_length
);
1275 data
= (__u32
) (unsigned long) fix
->mmio_start
;
1276 err
|= put_user(data
, &fix32
->mmio_start
);
1278 err
|= put_user(fix
->mmio_len
, &fix32
->mmio_len
);
1279 err
|= put_user(fix
->accel
, &fix32
->accel
);
1280 err
|= copy_to_user(fix32
->reserved
, fix
->reserved
,
1281 sizeof(fix
->reserved
));
1286 static int fb_get_fscreeninfo(struct fb_info
*info
, unsigned int cmd
,
1289 mm_segment_t old_fs
;
1290 struct fb_fix_screeninfo fix
;
1291 struct fb_fix_screeninfo32 __user
*fix32
;
1294 fix32
= compat_ptr(arg
);
1298 err
= do_fb_ioctl(info
, cmd
, (unsigned long) &fix
);
1302 err
= do_fscreeninfo_to_user(&fix
, fix32
);
1307 static long fb_compat_ioctl(struct file
*file
, unsigned int cmd
,
1310 struct fb_info
*info
= file_fb_info(file
);
1312 long ret
= -ENOIOCTLCMD
;
1318 case FBIOGET_VSCREENINFO
:
1319 case FBIOPUT_VSCREENINFO
:
1320 case FBIOPAN_DISPLAY
:
1321 case FBIOGET_CON2FBMAP
:
1322 case FBIOPUT_CON2FBMAP
:
1323 arg
= (unsigned long) compat_ptr(arg
);
1325 ret
= do_fb_ioctl(info
, cmd
, arg
);
1328 case FBIOGET_FSCREENINFO
:
1329 ret
= fb_get_fscreeninfo(info
, cmd
, arg
);
1334 ret
= fb_getput_cmap(info
, cmd
, arg
);
1338 if (fb
->fb_compat_ioctl
)
1339 ret
= fb
->fb_compat_ioctl(info
, cmd
, arg
);
1347 fb_mmap(struct file
*file
, struct vm_area_struct
* vma
)
1349 struct fb_info
*info
= file_fb_info(file
);
1352 unsigned long start
;
1357 if (vma
->vm_pgoff
> (~0UL >> PAGE_SHIFT
))
1359 off
= vma
->vm_pgoff
<< PAGE_SHIFT
;
1363 mutex_lock(&info
->mm_lock
);
1366 res
= fb
->fb_mmap(info
, vma
);
1367 mutex_unlock(&info
->mm_lock
);
1371 /* frame buffer memory */
1372 start
= info
->fix
.smem_start
;
1373 len
= PAGE_ALIGN((start
& ~PAGE_MASK
) + info
->fix
.smem_len
);
1375 /* memory mapped io */
1377 if (info
->var
.accel_flags
) {
1378 mutex_unlock(&info
->mm_lock
);
1381 start
= info
->fix
.mmio_start
;
1382 len
= PAGE_ALIGN((start
& ~PAGE_MASK
) + info
->fix
.mmio_len
);
1384 mutex_unlock(&info
->mm_lock
);
1386 if ((vma
->vm_end
- vma
->vm_start
+ off
) > len
)
1389 vma
->vm_pgoff
= off
>> PAGE_SHIFT
;
1390 /* This is an IO map - tell maydump to skip this VMA */
1391 vma
->vm_flags
|= VM_IO
| VM_RESERVED
;
1392 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
1393 fb_pgprotect(file
, vma
, off
);
1394 if (io_remap_pfn_range(vma
, vma
->vm_start
, off
>> PAGE_SHIFT
,
1395 vma
->vm_end
- vma
->vm_start
, vma
->vm_page_prot
))
1401 fb_open(struct inode
*inode
, struct file
*file
)
1402 __acquires(&info
->lock
)
1403 __releases(&info
->lock
)
1405 int fbidx
= iminor(inode
);
1406 struct fb_info
*info
;
1409 info
= get_fb_info(fbidx
);
1411 request_module("fb%d", fbidx
);
1412 info
= get_fb_info(fbidx
);
1417 return PTR_ERR(info
);
1419 mutex_lock(&info
->lock
);
1420 if (!try_module_get(info
->fbops
->owner
)) {
1424 file
->private_data
= info
;
1425 if (info
->fbops
->fb_open
) {
1426 res
= info
->fbops
->fb_open(info
,1);
1428 module_put(info
->fbops
->owner
);
1430 #ifdef CONFIG_FB_DEFERRED_IO
1432 fb_deferred_io_open(info
, inode
, file
);
1435 mutex_unlock(&info
->lock
);
1442 fb_release(struct inode
*inode
, struct file
*file
)
1443 __acquires(&info
->lock
)
1444 __releases(&info
->lock
)
1446 struct fb_info
* const info
= file
->private_data
;
1448 mutex_lock(&info
->lock
);
1449 if (info
->fbops
->fb_release
)
1450 info
->fbops
->fb_release(info
,1);
1451 module_put(info
->fbops
->owner
);
1452 mutex_unlock(&info
->lock
);
1457 static const struct file_operations fb_fops
= {
1458 .owner
= THIS_MODULE
,
1461 .unlocked_ioctl
= fb_ioctl
,
1462 #ifdef CONFIG_COMPAT
1463 .compat_ioctl
= fb_compat_ioctl
,
1467 .release
= fb_release
,
1468 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1469 .get_unmapped_area
= get_fb_unmapped_area
,
1471 #ifdef CONFIG_FB_DEFERRED_IO
1472 .fsync
= fb_deferred_io_fsync
,
1474 .llseek
= default_llseek
,
1477 struct class *fb_class
;
1478 EXPORT_SYMBOL(fb_class
);
1480 static int fb_check_foreignness(struct fb_info
*fi
)
1482 const bool foreign_endian
= fi
->flags
& FBINFO_FOREIGN_ENDIAN
;
1484 fi
->flags
&= ~FBINFO_FOREIGN_ENDIAN
;
1487 fi
->flags
|= foreign_endian
? 0 : FBINFO_BE_MATH
;
1489 fi
->flags
|= foreign_endian
? FBINFO_BE_MATH
: 0;
1490 #endif /* __BIG_ENDIAN */
1492 if (fi
->flags
& FBINFO_BE_MATH
&& !fb_be_math(fi
)) {
1493 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1494 "support this framebuffer\n", fi
->fix
.id
);
1496 } else if (!(fi
->flags
& FBINFO_BE_MATH
) && fb_be_math(fi
)) {
1497 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1498 "support this framebuffer\n", fi
->fix
.id
);
1505 static bool apertures_overlap(struct aperture
*gen
, struct aperture
*hw
)
1507 /* is the generic aperture base the same as the HW one */
1508 if (gen
->base
== hw
->base
)
1510 /* is the generic aperture base inside the hw base->hw base+size */
1511 if (gen
->base
> hw
->base
&& gen
->base
< hw
->base
+ hw
->size
)
1516 static bool fb_do_apertures_overlap(struct apertures_struct
*gena
,
1517 struct apertures_struct
*hwa
)
1523 for (i
= 0; i
< hwa
->count
; ++i
) {
1524 struct aperture
*h
= &hwa
->ranges
[i
];
1525 for (j
= 0; j
< gena
->count
; ++j
) {
1526 struct aperture
*g
= &gena
->ranges
[j
];
1527 printk(KERN_DEBUG
"checking generic (%llx %llx) vs hw (%llx %llx)\n",
1528 (unsigned long long)g
->base
,
1529 (unsigned long long)g
->size
,
1530 (unsigned long long)h
->base
,
1531 (unsigned long long)h
->size
);
1532 if (apertures_overlap(g
, h
))
1540 static int do_unregister_framebuffer(struct fb_info
*fb_info
);
1542 #define VGA_FB_PHYS 0xA0000
1543 static void do_remove_conflicting_framebuffers(struct apertures_struct
*a
,
1544 const char *name
, bool primary
)
1548 /* check all firmware fbs and kick off if the base addr overlaps */
1549 for (i
= 0 ; i
< FB_MAX
; i
++) {
1550 struct apertures_struct
*gen_aper
;
1551 if (!registered_fb
[i
])
1554 if (!(registered_fb
[i
]->flags
& FBINFO_MISC_FIRMWARE
))
1557 gen_aper
= registered_fb
[i
]->apertures
;
1558 if (fb_do_apertures_overlap(gen_aper
, a
) ||
1559 (primary
&& gen_aper
&& gen_aper
->count
&&
1560 gen_aper
->ranges
[0].base
== VGA_FB_PHYS
)) {
1562 printk(KERN_INFO
"fb: conflicting fb hw usage "
1563 "%s vs %s - removing generic driver\n",
1564 name
, registered_fb
[i
]->fix
.id
);
1565 do_unregister_framebuffer(registered_fb
[i
]);
1570 static int do_register_framebuffer(struct fb_info
*fb_info
)
1573 struct fb_event event
;
1574 struct fb_videomode mode
;
1576 if (fb_check_foreignness(fb_info
))
1579 do_remove_conflicting_framebuffers(fb_info
->apertures
, fb_info
->fix
.id
,
1580 fb_is_primary_device(fb_info
));
1582 if (num_registered_fb
== FB_MAX
)
1585 num_registered_fb
++;
1586 for (i
= 0 ; i
< FB_MAX
; i
++)
1587 if (!registered_fb
[i
])
1590 atomic_set(&fb_info
->count
, 1);
1591 mutex_init(&fb_info
->lock
);
1592 mutex_init(&fb_info
->mm_lock
);
1594 fb_info
->dev
= device_create(fb_class
, fb_info
->device
,
1595 MKDEV(FB_MAJOR
, i
), NULL
, "fb%d", i
);
1596 if (IS_ERR(fb_info
->dev
)) {
1598 printk(KERN_WARNING
"Unable to create device for framebuffer %d; errno = %ld\n", i
, PTR_ERR(fb_info
->dev
));
1599 fb_info
->dev
= NULL
;
1601 fb_init_device(fb_info
);
1603 if (fb_info
->pixmap
.addr
== NULL
) {
1604 fb_info
->pixmap
.addr
= kmalloc(FBPIXMAPSIZE
, GFP_KERNEL
);
1605 if (fb_info
->pixmap
.addr
) {
1606 fb_info
->pixmap
.size
= FBPIXMAPSIZE
;
1607 fb_info
->pixmap
.buf_align
= 1;
1608 fb_info
->pixmap
.scan_align
= 1;
1609 fb_info
->pixmap
.access_align
= 32;
1610 fb_info
->pixmap
.flags
= FB_PIXMAP_DEFAULT
;
1613 fb_info
->pixmap
.offset
= 0;
1615 if (!fb_info
->pixmap
.blit_x
)
1616 fb_info
->pixmap
.blit_x
= ~(u32
)0;
1618 if (!fb_info
->pixmap
.blit_y
)
1619 fb_info
->pixmap
.blit_y
= ~(u32
)0;
1621 if (!fb_info
->modelist
.prev
|| !fb_info
->modelist
.next
)
1622 INIT_LIST_HEAD(&fb_info
->modelist
);
1624 fb_var_to_videomode(&mode
, &fb_info
->var
);
1625 fb_add_videomode(&mode
, &fb_info
->modelist
);
1626 registered_fb
[i
] = fb_info
;
1628 event
.info
= fb_info
;
1629 if (!lock_fb_info(fb_info
))
1631 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED
, &event
);
1632 unlock_fb_info(fb_info
);
1636 static int do_unregister_framebuffer(struct fb_info
*fb_info
)
1638 struct fb_event event
;
1642 if (i
< 0 || i
>= FB_MAX
|| registered_fb
[i
] != fb_info
)
1645 if (!lock_fb_info(fb_info
))
1647 event
.info
= fb_info
;
1648 ret
= fb_notifier_call_chain(FB_EVENT_FB_UNBIND
, &event
);
1649 unlock_fb_info(fb_info
);
1654 unlink_framebuffer(fb_info
);
1655 if (fb_info
->pixmap
.addr
&&
1656 (fb_info
->pixmap
.flags
& FB_PIXMAP_DEFAULT
))
1657 kfree(fb_info
->pixmap
.addr
);
1658 fb_destroy_modelist(&fb_info
->modelist
);
1659 registered_fb
[i
] = NULL
;
1660 num_registered_fb
--;
1661 fb_cleanup_device(fb_info
);
1662 event
.info
= fb_info
;
1663 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED
, &event
);
1665 /* this may free fb info */
1666 put_fb_info(fb_info
);
1670 int unlink_framebuffer(struct fb_info
*fb_info
)
1675 if (i
< 0 || i
>= FB_MAX
|| registered_fb
[i
] != fb_info
)
1679 device_destroy(fb_class
, MKDEV(FB_MAJOR
, i
));
1680 fb_info
->dev
= NULL
;
1684 EXPORT_SYMBOL(unlink_framebuffer
);
1686 void remove_conflicting_framebuffers(struct apertures_struct
*a
,
1687 const char *name
, bool primary
)
1689 mutex_lock(®istration_lock
);
1690 do_remove_conflicting_framebuffers(a
, name
, primary
);
1691 mutex_unlock(®istration_lock
);
1693 EXPORT_SYMBOL(remove_conflicting_framebuffers
);
1696 * register_framebuffer - registers a frame buffer device
1697 * @fb_info: frame buffer info structure
1699 * Registers a frame buffer device @fb_info.
1701 * Returns negative errno on error, or zero for success.
1705 register_framebuffer(struct fb_info
*fb_info
)
1709 mutex_lock(®istration_lock
);
1710 ret
= do_register_framebuffer(fb_info
);
1711 mutex_unlock(®istration_lock
);
1717 * unregister_framebuffer - releases a frame buffer device
1718 * @fb_info: frame buffer info structure
1720 * Unregisters a frame buffer device @fb_info.
1722 * Returns negative errno on error, or zero for success.
1724 * This function will also notify the framebuffer console
1725 * to release the driver.
1727 * This is meant to be called within a driver's module_exit()
1728 * function. If this is called outside module_exit(), ensure
1729 * that the driver implements fb_open() and fb_release() to
1730 * check that no processes are using the device.
1733 unregister_framebuffer(struct fb_info
*fb_info
)
1737 mutex_lock(®istration_lock
);
1738 ret
= do_unregister_framebuffer(fb_info
);
1739 mutex_unlock(®istration_lock
);
1745 * fb_set_suspend - low level driver signals suspend
1746 * @info: framebuffer affected
1747 * @state: 0 = resuming, !=0 = suspending
1749 * This is meant to be used by low level drivers to
1750 * signal suspend/resume to the core & clients.
1751 * It must be called with the console semaphore held
1753 void fb_set_suspend(struct fb_info
*info
, int state
)
1755 struct fb_event event
;
1759 fb_notifier_call_chain(FB_EVENT_SUSPEND
, &event
);
1760 info
->state
= FBINFO_STATE_SUSPENDED
;
1762 info
->state
= FBINFO_STATE_RUNNING
;
1763 fb_notifier_call_chain(FB_EVENT_RESUME
, &event
);
1768 * fbmem_init - init frame buffer subsystem
1770 * Initialize the frame buffer subsystem.
1772 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1779 proc_create("fb", 0, NULL
, &fb_proc_fops
);
1781 if (register_chrdev(FB_MAJOR
,"fb",&fb_fops
))
1782 printk("unable to get major %d for fb devs\n", FB_MAJOR
);
1784 fb_class
= class_create(THIS_MODULE
, "graphics");
1785 if (IS_ERR(fb_class
)) {
1786 printk(KERN_WARNING
"Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class
));
1793 module_init(fbmem_init
);
1797 remove_proc_entry("fb", NULL
);
1798 class_destroy(fb_class
);
1799 unregister_chrdev(FB_MAJOR
, "fb");
1802 module_exit(fbmem_exit
);
1803 MODULE_LICENSE("GPL");
1804 MODULE_DESCRIPTION("Framebuffer base");
1806 subsys_initcall(fbmem_init
);
1809 int fb_new_modelist(struct fb_info
*info
)
1811 struct fb_event event
;
1812 struct fb_var_screeninfo var
= info
->var
;
1813 struct list_head
*pos
, *n
;
1814 struct fb_modelist
*modelist
;
1815 struct fb_videomode
*m
, mode
;
1818 list_for_each_safe(pos
, n
, &info
->modelist
) {
1819 modelist
= list_entry(pos
, struct fb_modelist
, list
);
1820 m
= &modelist
->mode
;
1821 fb_videomode_to_var(&var
, m
);
1822 var
.activate
= FB_ACTIVATE_TEST
;
1823 err
= fb_set_var(info
, &var
);
1824 fb_var_to_videomode(&mode
, &var
);
1825 if (err
|| !fb_mode_is_equal(m
, &mode
)) {
1833 if (!list_empty(&info
->modelist
)) {
1834 if (!lock_fb_info(info
))
1837 err
= fb_notifier_call_chain(FB_EVENT_NEW_MODELIST
, &event
);
1838 unlock_fb_info(info
);
1844 static char *video_options
[FB_MAX
] __read_mostly
;
1845 static int ofonly __read_mostly
;
1848 * fb_get_options - get kernel boot parameters
1849 * @name: framebuffer name as it would appear in
1850 * the boot parameter line
1851 * (video=<name>:<options>)
1852 * @option: the option will be stored here
1854 * NOTE: Needed to maintain backwards compatibility
1856 int fb_get_options(char *name
, char **option
)
1858 char *opt
, *options
= NULL
;
1860 int name_len
= strlen(name
), i
;
1862 if (name_len
&& ofonly
&& strncmp(name
, "offb", 4))
1865 if (name_len
&& !retval
) {
1866 for (i
= 0; i
< FB_MAX
; i
++) {
1867 if (video_options
[i
] == NULL
)
1869 if (!video_options
[i
][0])
1871 opt
= video_options
[i
];
1872 if (!strncmp(name
, opt
, name_len
) &&
1873 opt
[name_len
] == ':')
1874 options
= opt
+ name_len
+ 1;
1877 if (options
&& !strncmp(options
, "off", 3))
1888 * video_setup - process command line options
1889 * @options: string of options
1891 * Process command line options for frame buffer subsystem.
1893 * NOTE: This function is a __setup and __init function.
1894 * It only stores the options. Drivers have to call
1895 * fb_get_options() as necessary.
1900 static int __init
video_setup(char *options
)
1904 if (!options
|| !*options
)
1907 if (!global
&& !strncmp(options
, "ofonly", 6)) {
1912 if (!global
&& !strchr(options
, ':')) {
1913 fb_mode_option
= options
;
1918 for (i
= 0; i
< FB_MAX
; i
++) {
1919 if (video_options
[i
] == NULL
) {
1920 video_options
[i
] = options
;
1929 __setup("video=", video_setup
);
1933 * Visible symbols for modules
1936 EXPORT_SYMBOL(register_framebuffer
);
1937 EXPORT_SYMBOL(unregister_framebuffer
);
1938 EXPORT_SYMBOL(num_registered_fb
);
1939 EXPORT_SYMBOL(registered_fb
);
1940 EXPORT_SYMBOL(fb_show_logo
);
1941 EXPORT_SYMBOL(fb_set_var
);
1942 EXPORT_SYMBOL(fb_blank
);
1943 EXPORT_SYMBOL(fb_pan_display
);
1944 EXPORT_SYMBOL(fb_get_buffer_offset
);
1945 EXPORT_SYMBOL(fb_set_suspend
);
1946 EXPORT_SYMBOL(fb_get_options
);
1948 MODULE_LICENSE("GPL");