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>
35 #include <linux/fbcon.h>
36 #include <linux/mem_encrypt.h>
37 #include <linux/pci.h>
43 * Frame buffer device initialization and setup routines
46 #define FBPIXMAPSIZE (1024 * 8)
48 static DEFINE_MUTEX(registration_lock);
50 struct fb_info *registered_fb[FB_MAX] __read_mostly;
51 EXPORT_SYMBOL(registered_fb);
53 int num_registered_fb __read_mostly;
54 EXPORT_SYMBOL(num_registered_fb);
56 bool fb_center_logo __read_mostly;
57 EXPORT_SYMBOL(fb_center_logo);
59 static struct fb_info *get_fb_info(unsigned int idx)
61 struct fb_info *fb_info;
64 return ERR_PTR(-ENODEV);
66 mutex_lock(®istration_lock);
67 fb_info = registered_fb[idx];
69 atomic_inc(&fb_info->count);
70 mutex_unlock(®istration_lock);
75 static void put_fb_info(struct fb_info *fb_info)
77 if (!atomic_dec_and_test(&fb_info->count))
79 if (fb_info->fbops->fb_destroy)
80 fb_info->fbops->fb_destroy(fb_info);
87 int fb_get_color_depth(struct fb_var_screeninfo *var,
88 struct fb_fix_screeninfo *fix)
92 if (fix->visual == FB_VISUAL_MONO01 ||
93 fix->visual == FB_VISUAL_MONO10)
96 if (var->green.length == var->blue.length &&
97 var->green.length == var->red.length &&
98 var->green.offset == var->blue.offset &&
99 var->green.offset == var->red.offset)
100 depth = var->green.length;
102 depth = var->green.length + var->red.length +
108 EXPORT_SYMBOL(fb_get_color_depth);
111 * Data padding functions.
113 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
115 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
117 EXPORT_SYMBOL(fb_pad_aligned_buffer);
119 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
120 u32 shift_high, u32 shift_low, u32 mod)
122 u8 mask = (u8) (0xfff << shift_high), tmp;
125 for (i = height; i--; ) {
126 for (j = 0; j < idx; j++) {
129 tmp |= *src >> shift_low;
131 tmp = *src << shift_high;
137 tmp |= *src >> shift_low;
139 if (shift_high < mod) {
140 tmp = *src << shift_high;
147 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
150 * we need to lock this section since fb_cursor
151 * may use fb_imageblit()
153 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
155 u32 align = buf->buf_align - 1, offset;
156 char *addr = buf->addr;
158 /* If IO mapped, we need to sync before access, no sharing of
161 if (buf->flags & FB_PIXMAP_IO) {
162 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
163 info->fbops->fb_sync(info);
167 /* See if we fit in the remaining pixmap space */
168 offset = buf->offset + align;
170 if (offset + size > buf->size) {
171 /* We do not fit. In order to be able to re-use the buffer,
172 * we must ensure no asynchronous DMA'ing or whatever operation
173 * is in progress, we sync for that.
175 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
176 info->fbops->fb_sync(info);
179 buf->offset = offset + size;
184 EXPORT_SYMBOL(fb_get_buffer_offset);
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 && j < logo->width; 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 (image->width > info->var.xres || image->height > info->var.yres)
426 if (rotate == FB_ROTATE_UR) {
428 x < num && image->dx + image->width <= info->var.xres;
430 info->fbops->fb_imageblit(info, image);
431 image->dx += image->width + 8;
433 } else if (rotate == FB_ROTATE_UD) {
436 for (x = 0; x < num && image->dx <= dx; x++) {
437 info->fbops->fb_imageblit(info, image);
438 image->dx -= image->width + 8;
440 } else if (rotate == FB_ROTATE_CW) {
442 x < num && image->dy + image->height <= info->var.yres;
444 info->fbops->fb_imageblit(info, image);
445 image->dy += image->height + 8;
447 } else if (rotate == FB_ROTATE_CCW) {
450 for (x = 0; x < num && image->dy <= dy; x++) {
451 info->fbops->fb_imageblit(info, image);
452 image->dy -= image->height + 8;
457 static int fb_show_logo_line(struct fb_info *info, int rotate,
458 const struct linux_logo *logo, int y,
461 u32 *palette = NULL, *saved_pseudo_palette = NULL;
462 unsigned char *logo_new = NULL, *logo_rotate = NULL;
463 struct fb_image image;
465 /* Return if the frame buffer is not mapped or suspended */
466 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
471 image.data = logo->data;
473 if (fb_logo.needs_cmapreset)
474 fb_set_logocmap(info, logo);
476 if (fb_logo.needs_truepalette ||
477 fb_logo.needs_directpalette) {
478 palette = kmalloc(256 * 4, GFP_KERNEL);
482 if (fb_logo.needs_truepalette)
483 fb_set_logo_truepalette(info, logo, palette);
485 fb_set_logo_directpalette(info, logo, palette);
487 saved_pseudo_palette = info->pseudo_palette;
488 info->pseudo_palette = palette;
491 if (fb_logo.depth <= 4) {
492 logo_new = kmalloc_array(logo->width, logo->height,
494 if (logo_new == NULL) {
496 if (saved_pseudo_palette)
497 info->pseudo_palette = saved_pseudo_palette;
500 image.data = logo_new;
501 fb_set_logo(info, logo, logo_new, fb_logo.depth);
504 if (fb_center_logo) {
505 int xres = info->var.xres;
506 int yres = info->var.yres;
508 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
509 xres = info->var.yres;
510 yres = info->var.xres;
513 while (n && (n * (logo->width + 8) - 8 > xres))
515 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
516 image.dy = y ?: (yres - logo->height) / 2;
522 image.width = logo->width;
523 image.height = logo->height;
526 logo_rotate = kmalloc_array(logo->width, logo->height,
529 fb_rotate_logo(info, logo_rotate, &image, rotate);
532 fb_do_show_logo(info, &image, rotate, n);
535 if (saved_pseudo_palette != NULL)
536 info->pseudo_palette = saved_pseudo_palette;
539 return image.dy + logo->height;
543 #ifdef CONFIG_FB_LOGO_EXTRA
545 #define FB_LOGO_EX_NUM_MAX 10
546 static struct logo_data_extra {
547 const struct linux_logo *logo;
549 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
550 static unsigned int fb_logo_ex_num;
552 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
554 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
557 fb_logo_ex[fb_logo_ex_num].logo = logo;
558 fb_logo_ex[fb_logo_ex_num].n = n;
562 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
567 /* FIXME: logo_ex supports only truecolor fb. */
568 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
571 for (i = 0; i < fb_logo_ex_num; i++) {
572 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
573 fb_logo_ex[i].logo = NULL;
576 height += fb_logo_ex[i].logo->height;
578 height -= fb_logo_ex[i].logo->height;
586 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
590 for (i = 0; i < fb_logo_ex_num; i++)
591 y = fb_show_logo_line(info, rotate,
592 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
597 #else /* !CONFIG_FB_LOGO_EXTRA */
599 static inline int fb_prepare_extra_logos(struct fb_info *info,
606 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
611 #endif /* CONFIG_FB_LOGO_EXTRA */
614 int fb_prepare_logo(struct fb_info *info, int rotate)
616 int depth = fb_get_color_depth(&info->var, &info->fix);
620 memset(&fb_logo, 0, sizeof(struct logo_data));
622 if (info->flags & FBINFO_MISC_TILEBLITTING ||
626 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
627 depth = info->var.blue.length;
628 if (info->var.red.length < depth)
629 depth = info->var.red.length;
630 if (info->var.green.length < depth)
631 depth = info->var.green.length;
634 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
635 /* assume console colormap */
639 /* Return if no suitable logo was found */
640 fb_logo.logo = fb_find_logo(depth);
646 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
647 yres = info->var.yres;
649 yres = info->var.xres;
651 if (fb_logo.logo->height > yres) {
656 /* What depth we asked for might be different from what we get */
657 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
659 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
665 if (fb_logo.depth > 4 && depth > 4) {
666 switch (info->fix.visual) {
667 case FB_VISUAL_TRUECOLOR:
668 fb_logo.needs_truepalette = 1;
670 case FB_VISUAL_DIRECTCOLOR:
671 fb_logo.needs_directpalette = 1;
672 fb_logo.needs_cmapreset = 1;
674 case FB_VISUAL_PSEUDOCOLOR:
675 fb_logo.needs_cmapreset = 1;
680 height = fb_logo.logo->height;
682 height += (yres - fb_logo.logo->height) / 2;
684 return fb_prepare_extra_logos(info, height, yres);
687 int fb_show_logo(struct fb_info *info, int rotate)
691 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
693 y = fb_show_extra_logos(info, y, rotate);
698 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
699 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
700 #endif /* CONFIG_LOGO */
701 EXPORT_SYMBOL(fb_prepare_logo);
702 EXPORT_SYMBOL(fb_show_logo);
704 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
706 mutex_lock(®istration_lock);
707 return (*pos < FB_MAX) ? pos : NULL;
710 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
713 return (*pos < FB_MAX) ? pos : NULL;
716 static void fb_seq_stop(struct seq_file *m, void *v)
718 mutex_unlock(®istration_lock);
721 static int fb_seq_show(struct seq_file *m, void *v)
723 int i = *(loff_t *)v;
724 struct fb_info *fi = registered_fb[i];
727 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
731 static const struct seq_operations proc_fb_seq_ops = {
732 .start = fb_seq_start,
739 * We hold a reference to the fb_info in file->private_data,
740 * but if the current registered fb has changed, we don't
741 * actually want to use it.
743 * So look up the fb_info using the inode minor number,
744 * and just verify it against the reference we have.
746 static struct fb_info *file_fb_info(struct file *file)
748 struct inode *inode = file_inode(file);
749 int fbidx = iminor(inode);
750 struct fb_info *info = registered_fb[fbidx];
752 if (info != file->private_data)
758 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
760 unsigned long p = *ppos;
761 struct fb_info *info = file_fb_info(file);
764 int c, cnt = 0, err = 0;
765 unsigned long total_size;
767 if (!info || ! info->screen_base)
770 if (info->state != FBINFO_STATE_RUNNING)
773 if (info->fbops->fb_read)
774 return info->fbops->fb_read(info, buf, count, ppos);
776 total_size = info->screen_size;
779 total_size = info->fix.smem_len;
784 if (count >= total_size)
787 if (count + p > total_size)
788 count = total_size - p;
790 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
795 src = (u8 __iomem *) (info->screen_base + p);
797 if (info->fbops->fb_sync)
798 info->fbops->fb_sync(info);
801 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
803 fb_memcpy_fromfb(dst, src, c);
807 if (copy_to_user(buf, buffer, c)) {
819 return (err) ? err : cnt;
823 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
825 unsigned long p = *ppos;
826 struct fb_info *info = file_fb_info(file);
829 int c, cnt = 0, err = 0;
830 unsigned long total_size;
832 if (!info || !info->screen_base)
835 if (info->state != FBINFO_STATE_RUNNING)
838 if (info->fbops->fb_write)
839 return info->fbops->fb_write(info, buf, count, ppos);
841 total_size = info->screen_size;
844 total_size = info->fix.smem_len;
849 if (count > total_size) {
854 if (count + p > total_size) {
858 count = total_size - p;
861 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
866 dst = (u8 __iomem *) (info->screen_base + p);
868 if (info->fbops->fb_sync)
869 info->fbops->fb_sync(info);
872 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
875 if (copy_from_user(src, buf, c)) {
880 fb_memcpy_tofb(dst, src, c);
891 return (cnt) ? cnt : err;
895 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
897 struct fb_fix_screeninfo *fix = &info->fix;
898 unsigned int yres = info->var.yres;
901 if (var->yoffset > 0) {
902 if (var->vmode & FB_VMODE_YWRAP) {
903 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
907 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
911 if (var->xoffset > 0 && (!fix->xpanstep ||
912 (var->xoffset % fix->xpanstep)))
915 if (err || !info->fbops->fb_pan_display ||
916 var->yoffset > info->var.yres_virtual - yres ||
917 var->xoffset > info->var.xres_virtual - info->var.xres)
920 if ((err = info->fbops->fb_pan_display(var, info)))
922 info->var.xoffset = var->xoffset;
923 info->var.yoffset = var->yoffset;
924 if (var->vmode & FB_VMODE_YWRAP)
925 info->var.vmode |= FB_VMODE_YWRAP;
927 info->var.vmode &= ~FB_VMODE_YWRAP;
930 EXPORT_SYMBOL(fb_pan_display);
932 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
935 struct fb_blit_caps caps, fbcaps;
938 memset(&caps, 0, sizeof(caps));
939 memset(&fbcaps, 0, sizeof(fbcaps));
940 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
941 fbcon_get_requirement(info, &caps);
942 info->fbops->fb_get_caps(info, &fbcaps, var);
944 if (((fbcaps.x ^ caps.x) & caps.x) ||
945 ((fbcaps.y ^ caps.y) & caps.y) ||
946 (fbcaps.len < caps.len))
953 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
955 int flags = info->flags;
958 struct fb_var_screeninfo old_var;
959 struct fb_videomode mode;
961 if (var->activate & FB_ACTIVATE_INV_MODE) {
962 struct fb_videomode mode1, mode2;
964 fb_var_to_videomode(&mode1, var);
965 fb_var_to_videomode(&mode2, &info->var);
966 /* make sure we don't delete the videomode of current var */
967 ret = fb_mode_is_equal(&mode1, &mode2);
970 fbcon_mode_deleted(info, &mode1);
973 fb_delete_videomode(&mode1, &info->modelist);
976 return ret ? -EINVAL : 0;
979 if (!(var->activate & FB_ACTIVATE_FORCE) &&
980 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
983 activate = var->activate;
985 /* When using FOURCC mode, make sure the red, green, blue and
986 * transp fields are set to 0.
988 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
989 var->grayscale > 1) {
990 if (var->red.offset || var->green.offset ||
991 var->blue.offset || var->transp.offset ||
992 var->red.length || var->green.length ||
993 var->blue.length || var->transp.length ||
994 var->red.msb_right || var->green.msb_right ||
995 var->blue.msb_right || var->transp.msb_right)
999 if (!info->fbops->fb_check_var) {
1004 ret = info->fbops->fb_check_var(var, info);
1009 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1012 if (info->fbops->fb_get_caps) {
1013 ret = fb_check_caps(info, var, activate);
1019 old_var = info->var;
1022 if (info->fbops->fb_set_par) {
1023 ret = info->fbops->fb_set_par(info);
1026 info->var = old_var;
1027 printk(KERN_WARNING "detected "
1028 "fb_set_par error, "
1029 "error code: %d\n", ret);
1034 fb_pan_display(info, &info->var);
1035 fb_set_cmap(&info->cmap, info);
1036 fb_var_to_videomode(&mode, &info->var);
1038 if (info->modelist.prev && info->modelist.next &&
1039 !list_empty(&info->modelist))
1040 ret = fb_add_videomode(&mode, &info->modelist);
1042 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1043 struct fb_event event;
1044 int evnt = (activate & FB_ACTIVATE_ALL) ?
1045 FB_EVENT_MODE_CHANGE_ALL :
1046 FB_EVENT_MODE_CHANGE;
1048 info->flags &= ~FBINFO_MISC_USEREVENT;
1051 fb_notifier_call_chain(evnt, &event);
1056 EXPORT_SYMBOL(fb_set_var);
1059 fb_blank(struct fb_info *info, int blank)
1061 struct fb_event event;
1062 int ret = -EINVAL, early_ret;
1064 if (blank > FB_BLANK_POWERDOWN)
1065 blank = FB_BLANK_POWERDOWN;
1068 event.data = ␣
1070 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1072 if (info->fbops->fb_blank)
1073 ret = info->fbops->fb_blank(blank, info);
1076 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1079 * if fb_blank is failed then revert effects of
1080 * the early blank event.
1083 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1088 EXPORT_SYMBOL(fb_blank);
1090 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1094 struct fb_var_screeninfo var;
1095 struct fb_fix_screeninfo fix;
1096 struct fb_con2fbmap con2fb;
1097 struct fb_cmap cmap_from;
1098 struct fb_cmap_user cmap;
1099 struct fb_event event;
1100 void __user *argp = (void __user *)arg;
1104 case FBIOGET_VSCREENINFO:
1107 unlock_fb_info(info);
1109 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1111 case FBIOPUT_VSCREENINFO:
1112 if (copy_from_user(&var, argp, sizeof(var)))
1116 info->flags |= FBINFO_MISC_USEREVENT;
1117 ret = fb_set_var(info, &var);
1118 info->flags &= ~FBINFO_MISC_USEREVENT;
1119 unlock_fb_info(info);
1121 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1124 case FBIOGET_FSCREENINFO:
1127 if (info->flags & FBINFO_HIDE_SMEM_START)
1129 unlock_fb_info(info);
1131 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1134 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1136 ret = fb_set_user_cmap(&cmap, info);
1139 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1142 cmap_from = info->cmap;
1143 unlock_fb_info(info);
1144 ret = fb_cmap_to_user(&cmap_from, &cmap);
1146 case FBIOPAN_DISPLAY:
1147 if (copy_from_user(&var, argp, sizeof(var)))
1151 ret = fb_pan_display(info, &var);
1152 unlock_fb_info(info);
1154 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1160 case FBIOGET_CON2FBMAP:
1161 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1163 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1165 con2fb.framebuffer = -1;
1166 event.data = &con2fb;
1169 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1170 unlock_fb_info(info);
1171 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1173 case FBIOPUT_CON2FBMAP:
1174 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1176 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1178 if (con2fb.framebuffer >= FB_MAX)
1180 if (!registered_fb[con2fb.framebuffer])
1181 request_module("fb%d", con2fb.framebuffer);
1182 if (!registered_fb[con2fb.framebuffer]) {
1186 event.data = &con2fb;
1190 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1191 unlock_fb_info(info);
1197 ret = fb_blank(info, arg);
1198 /* might again call into fb_blank */
1199 fbcon_fb_blanked(info, arg);
1200 unlock_fb_info(info);
1207 ret = fb->fb_ioctl(info, cmd, arg);
1210 unlock_fb_info(info);
1215 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1217 struct fb_info *info = file_fb_info(file);
1221 return do_fb_ioctl(info, cmd, arg);
1224 #ifdef CONFIG_COMPAT
1225 struct fb_fix_screeninfo32 {
1227 compat_caddr_t smem_start;
1236 compat_caddr_t mmio_start;
1246 compat_caddr_t green;
1247 compat_caddr_t blue;
1248 compat_caddr_t transp;
1251 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1254 struct fb_cmap_user __user *cmap;
1255 struct fb_cmap32 __user *cmap32;
1259 cmap = compat_alloc_user_space(sizeof(*cmap));
1260 cmap32 = compat_ptr(arg);
1262 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1265 if (get_user(data, &cmap32->red) ||
1266 put_user(compat_ptr(data), &cmap->red) ||
1267 get_user(data, &cmap32->green) ||
1268 put_user(compat_ptr(data), &cmap->green) ||
1269 get_user(data, &cmap32->blue) ||
1270 put_user(compat_ptr(data), &cmap->blue) ||
1271 get_user(data, &cmap32->transp) ||
1272 put_user(compat_ptr(data), &cmap->transp))
1275 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1278 if (copy_in_user(&cmap32->start,
1286 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1287 struct fb_fix_screeninfo32 __user *fix32)
1292 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1294 data = (__u32) (unsigned long) fix->smem_start;
1295 err |= put_user(data, &fix32->smem_start);
1297 err |= put_user(fix->smem_len, &fix32->smem_len);
1298 err |= put_user(fix->type, &fix32->type);
1299 err |= put_user(fix->type_aux, &fix32->type_aux);
1300 err |= put_user(fix->visual, &fix32->visual);
1301 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1302 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1303 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1304 err |= put_user(fix->line_length, &fix32->line_length);
1306 data = (__u32) (unsigned long) fix->mmio_start;
1307 err |= put_user(data, &fix32->mmio_start);
1309 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1310 err |= put_user(fix->accel, &fix32->accel);
1311 err |= copy_to_user(fix32->reserved, fix->reserved,
1312 sizeof(fix->reserved));
1319 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1322 struct fb_fix_screeninfo fix;
1326 if (info->flags & FBINFO_HIDE_SMEM_START)
1328 unlock_fb_info(info);
1329 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1332 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1335 struct fb_info *info = file_fb_info(file);
1337 long ret = -ENOIOCTLCMD;
1343 case FBIOGET_VSCREENINFO:
1344 case FBIOPUT_VSCREENINFO:
1345 case FBIOPAN_DISPLAY:
1346 case FBIOGET_CON2FBMAP:
1347 case FBIOPUT_CON2FBMAP:
1348 arg = (unsigned long) compat_ptr(arg);
1351 ret = do_fb_ioctl(info, cmd, arg);
1354 case FBIOGET_FSCREENINFO:
1355 ret = fb_get_fscreeninfo(info, cmd, arg);
1360 ret = fb_getput_cmap(info, cmd, arg);
1364 if (fb->fb_compat_ioctl)
1365 ret = fb->fb_compat_ioctl(info, cmd, arg);
1373 fb_mmap(struct file *file, struct vm_area_struct * vma)
1375 struct fb_info *info = file_fb_info(file);
1377 unsigned long mmio_pgoff;
1378 unsigned long start;
1384 mutex_lock(&info->mm_lock);
1389 * The framebuffer needs to be accessed decrypted, be sure
1390 * SME protection is removed ahead of the call
1392 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1393 res = fb->fb_mmap(info, vma);
1394 mutex_unlock(&info->mm_lock);
1399 * Ugh. This can be either the frame buffer mapping, or
1400 * if pgoff points past it, the mmio mapping.
1402 start = info->fix.smem_start;
1403 len = info->fix.smem_len;
1404 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1405 if (vma->vm_pgoff >= mmio_pgoff) {
1406 if (info->var.accel_flags) {
1407 mutex_unlock(&info->mm_lock);
1411 vma->vm_pgoff -= mmio_pgoff;
1412 start = info->fix.mmio_start;
1413 len = info->fix.mmio_len;
1415 mutex_unlock(&info->mm_lock);
1417 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1419 * The framebuffer needs to be accessed decrypted, be sure
1420 * SME protection is removed
1422 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1423 fb_pgprotect(file, vma, start);
1425 return vm_iomap_memory(vma, start, len);
1429 fb_open(struct inode *inode, struct file *file)
1430 __acquires(&info->lock)
1431 __releases(&info->lock)
1433 int fbidx = iminor(inode);
1434 struct fb_info *info;
1437 info = get_fb_info(fbidx);
1439 request_module("fb%d", fbidx);
1440 info = get_fb_info(fbidx);
1445 return PTR_ERR(info);
1448 if (!try_module_get(info->fbops->owner)) {
1452 file->private_data = info;
1453 if (info->fbops->fb_open) {
1454 res = info->fbops->fb_open(info,1);
1456 module_put(info->fbops->owner);
1458 #ifdef CONFIG_FB_DEFERRED_IO
1460 fb_deferred_io_open(info, inode, file);
1463 unlock_fb_info(info);
1470 fb_release(struct inode *inode, struct file *file)
1471 __acquires(&info->lock)
1472 __releases(&info->lock)
1474 struct fb_info * const info = file->private_data;
1477 if (info->fbops->fb_release)
1478 info->fbops->fb_release(info,1);
1479 module_put(info->fbops->owner);
1480 unlock_fb_info(info);
1485 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1486 unsigned long get_fb_unmapped_area(struct file *filp,
1487 unsigned long addr, unsigned long len,
1488 unsigned long pgoff, unsigned long flags)
1490 struct fb_info * const info = filp->private_data;
1491 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1493 if (pgoff > fb_size || len > fb_size - pgoff)
1496 return (unsigned long)info->screen_base + pgoff;
1500 static const struct file_operations fb_fops = {
1501 .owner = THIS_MODULE,
1504 .unlocked_ioctl = fb_ioctl,
1505 #ifdef CONFIG_COMPAT
1506 .compat_ioctl = fb_compat_ioctl,
1510 .release = fb_release,
1511 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1512 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1513 !defined(CONFIG_MMU))
1514 .get_unmapped_area = get_fb_unmapped_area,
1516 #ifdef CONFIG_FB_DEFERRED_IO
1517 .fsync = fb_deferred_io_fsync,
1519 .llseek = default_llseek,
1522 struct class *fb_class;
1523 EXPORT_SYMBOL(fb_class);
1525 static int fb_check_foreignness(struct fb_info *fi)
1527 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1529 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1532 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1534 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1535 #endif /* __BIG_ENDIAN */
1537 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1538 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1539 "support this framebuffer\n", fi->fix.id);
1541 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1542 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1543 "support this framebuffer\n", fi->fix.id);
1550 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1552 /* is the generic aperture base the same as the HW one */
1553 if (gen->base == hw->base)
1555 /* is the generic aperture base inside the hw base->hw base+size */
1556 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1561 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1562 struct apertures_struct *hwa)
1568 for (i = 0; i < hwa->count; ++i) {
1569 struct aperture *h = &hwa->ranges[i];
1570 for (j = 0; j < gena->count; ++j) {
1571 struct aperture *g = &gena->ranges[j];
1572 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1573 (unsigned long long)g->base,
1574 (unsigned long long)g->size,
1575 (unsigned long long)h->base,
1576 (unsigned long long)h->size);
1577 if (apertures_overlap(g, h))
1585 static void do_unregister_framebuffer(struct fb_info *fb_info);
1587 #define VGA_FB_PHYS 0xA0000
1588 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1589 const char *name, bool primary)
1593 /* check all firmware fbs and kick off if the base addr overlaps */
1594 for_each_registered_fb(i) {
1595 struct apertures_struct *gen_aper;
1597 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1600 gen_aper = registered_fb[i]->apertures;
1601 if (fb_do_apertures_overlap(gen_aper, a) ||
1602 (primary && gen_aper && gen_aper->count &&
1603 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1605 printk(KERN_INFO "fb%d: switching to %s from %s\n",
1606 i, name, registered_fb[i]->fix.id);
1607 do_unregister_framebuffer(registered_fb[i]);
1612 static bool lockless_register_fb;
1613 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1614 MODULE_PARM_DESC(lockless_register_fb,
1615 "Lockless framebuffer registration for debugging [default=off]");
1617 static int do_register_framebuffer(struct fb_info *fb_info)
1620 struct fb_videomode mode;
1622 if (fb_check_foreignness(fb_info))
1625 do_remove_conflicting_framebuffers(fb_info->apertures,
1627 fb_is_primary_device(fb_info));
1629 if (num_registered_fb == FB_MAX)
1632 num_registered_fb++;
1633 for (i = 0 ; i < FB_MAX; i++)
1634 if (!registered_fb[i])
1637 atomic_set(&fb_info->count, 1);
1638 mutex_init(&fb_info->lock);
1639 mutex_init(&fb_info->mm_lock);
1641 fb_info->dev = device_create(fb_class, fb_info->device,
1642 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1643 if (IS_ERR(fb_info->dev)) {
1645 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1646 fb_info->dev = NULL;
1648 fb_init_device(fb_info);
1650 if (fb_info->pixmap.addr == NULL) {
1651 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1652 if (fb_info->pixmap.addr) {
1653 fb_info->pixmap.size = FBPIXMAPSIZE;
1654 fb_info->pixmap.buf_align = 1;
1655 fb_info->pixmap.scan_align = 1;
1656 fb_info->pixmap.access_align = 32;
1657 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1660 fb_info->pixmap.offset = 0;
1662 if (!fb_info->pixmap.blit_x)
1663 fb_info->pixmap.blit_x = ~(u32)0;
1665 if (!fb_info->pixmap.blit_y)
1666 fb_info->pixmap.blit_y = ~(u32)0;
1668 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1669 INIT_LIST_HEAD(&fb_info->modelist);
1671 if (fb_info->skip_vt_switch)
1672 pm_vt_switch_required(fb_info->dev, false);
1674 pm_vt_switch_required(fb_info->dev, true);
1676 fb_var_to_videomode(&mode, &fb_info->var);
1677 fb_add_videomode(&mode, &fb_info->modelist);
1678 registered_fb[i] = fb_info;
1680 #ifdef CONFIG_GUMSTIX_AM200EPD
1682 struct fb_event event;
1683 event.info = fb_info;
1684 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1688 if (!lockless_register_fb)
1691 atomic_inc(&ignore_console_lock_warning);
1692 lock_fb_info(fb_info);
1693 ret = fbcon_fb_registered(fb_info);
1694 unlock_fb_info(fb_info);
1696 if (!lockless_register_fb)
1699 atomic_dec(&ignore_console_lock_warning);
1703 static void unbind_console(struct fb_info *fb_info)
1705 int i = fb_info->node;
1707 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1711 lock_fb_info(fb_info);
1712 fbcon_fb_unbind(fb_info);
1713 unlock_fb_info(fb_info);
1717 void unlink_framebuffer(struct fb_info *fb_info)
1722 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1728 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1730 pm_vt_switch_unregister(fb_info->dev);
1732 unbind_console(fb_info);
1734 fb_info->dev = NULL;
1736 EXPORT_SYMBOL(unlink_framebuffer);
1738 static void do_unregister_framebuffer(struct fb_info *fb_info)
1740 unlink_framebuffer(fb_info);
1741 if (fb_info->pixmap.addr &&
1742 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1743 kfree(fb_info->pixmap.addr);
1744 fb_destroy_modelist(&fb_info->modelist);
1745 registered_fb[fb_info->node] = NULL;
1746 num_registered_fb--;
1747 fb_cleanup_device(fb_info);
1748 #ifdef CONFIG_GUMSTIX_AM200EPD
1750 struct fb_event event;
1751 event.info = fb_info;
1752 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1756 fbcon_fb_unregistered(fb_info);
1759 /* this may free fb info */
1760 put_fb_info(fb_info);
1764 * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1765 * @a: memory range, users of which are to be removed
1766 * @name: requesting driver name
1767 * @primary: also kick vga16fb if present
1769 * This function removes framebuffer devices (initialized by firmware/bootloader)
1770 * which use memory range described by @a. If @a is NULL all such devices are
1773 int remove_conflicting_framebuffers(struct apertures_struct *a,
1774 const char *name, bool primary)
1776 bool do_free = false;
1779 a = alloc_apertures(1);
1783 a->ranges[0].base = 0;
1784 a->ranges[0].size = ~0;
1788 mutex_lock(®istration_lock);
1789 do_remove_conflicting_framebuffers(a, name, primary);
1790 mutex_unlock(®istration_lock);
1797 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1800 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1802 * @res_id: index of PCI BAR configuring framebuffer memory
1803 * @name: requesting driver name
1805 * This function removes framebuffer devices (eg. initialized by firmware)
1806 * using memory range configured for @pdev's BAR @res_id.
1808 * The function assumes that PCI device with shadowed ROM drives a primary
1809 * display and so kicks out vga16fb.
1811 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
1813 struct apertures_struct *ap;
1814 bool primary = false;
1816 bool res_id_found = false;
1818 for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1819 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1824 ap = alloc_apertures(idx);
1828 for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1829 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1831 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1832 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1833 pci_info(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1834 (unsigned long)pci_resource_start(pdev, bar),
1835 (unsigned long)pci_resource_end(pdev, bar));
1838 res_id_found = true;
1841 pci_warn(pdev, "%s: passed res_id (%d) is not a memory bar\n",
1845 primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1846 IORESOURCE_ROM_SHADOW;
1848 err = remove_conflicting_framebuffers(ap, name, primary);
1852 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1855 * register_framebuffer - registers a frame buffer device
1856 * @fb_info: frame buffer info structure
1858 * Registers a frame buffer device @fb_info.
1860 * Returns negative errno on error, or zero for success.
1864 register_framebuffer(struct fb_info *fb_info)
1868 mutex_lock(®istration_lock);
1869 ret = do_register_framebuffer(fb_info);
1870 mutex_unlock(®istration_lock);
1874 EXPORT_SYMBOL(register_framebuffer);
1877 * unregister_framebuffer - releases a frame buffer device
1878 * @fb_info: frame buffer info structure
1880 * Unregisters a frame buffer device @fb_info.
1882 * Returns negative errno on error, or zero for success.
1884 * This function will also notify the framebuffer console
1885 * to release the driver.
1887 * This is meant to be called within a driver's module_exit()
1888 * function. If this is called outside module_exit(), ensure
1889 * that the driver implements fb_open() and fb_release() to
1890 * check that no processes are using the device.
1893 unregister_framebuffer(struct fb_info *fb_info)
1895 mutex_lock(®istration_lock);
1896 do_unregister_framebuffer(fb_info);
1897 mutex_unlock(®istration_lock);
1899 EXPORT_SYMBOL(unregister_framebuffer);
1902 * fb_set_suspend - low level driver signals suspend
1903 * @info: framebuffer affected
1904 * @state: 0 = resuming, !=0 = suspending
1906 * This is meant to be used by low level drivers to
1907 * signal suspend/resume to the core & clients.
1908 * It must be called with the console semaphore held
1910 void fb_set_suspend(struct fb_info *info, int state)
1912 WARN_CONSOLE_UNLOCKED();
1915 fbcon_suspended(info);
1916 info->state = FBINFO_STATE_SUSPENDED;
1918 info->state = FBINFO_STATE_RUNNING;
1919 fbcon_resumed(info);
1922 EXPORT_SYMBOL(fb_set_suspend);
1925 * fbmem_init - init frame buffer subsystem
1927 * Initialize the frame buffer subsystem.
1929 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1938 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1941 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1943 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1947 fb_class = class_create(THIS_MODULE, "graphics");
1948 if (IS_ERR(fb_class)) {
1949 ret = PTR_ERR(fb_class);
1950 pr_warn("Unable to create fb class; errno = %d\n", ret);
1960 unregister_chrdev(FB_MAJOR, "fb");
1962 remove_proc_entry("fb", NULL);
1967 module_init(fbmem_init);
1973 remove_proc_entry("fb", NULL);
1974 class_destroy(fb_class);
1975 unregister_chrdev(FB_MAJOR, "fb");
1978 module_exit(fbmem_exit);
1979 MODULE_LICENSE("GPL");
1980 MODULE_DESCRIPTION("Framebuffer base");
1982 subsys_initcall(fbmem_init);
1985 int fb_new_modelist(struct fb_info *info)
1987 struct fb_var_screeninfo var = info->var;
1988 struct list_head *pos, *n;
1989 struct fb_modelist *modelist;
1990 struct fb_videomode *m, mode;
1993 list_for_each_safe(pos, n, &info->modelist) {
1994 modelist = list_entry(pos, struct fb_modelist, list);
1995 m = &modelist->mode;
1996 fb_videomode_to_var(&var, m);
1997 var.activate = FB_ACTIVATE_TEST;
1998 err = fb_set_var(info, &var);
1999 fb_var_to_videomode(&mode, &var);
2000 if (err || !fb_mode_is_equal(m, &mode)) {
2006 if (list_empty(&info->modelist))
2009 fbcon_new_modelist(info);
2014 MODULE_LICENSE("GPL");