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);
83 int lock_fb_info(struct fb_info *info)
85 mutex_lock(&info->lock);
87 mutex_unlock(&info->lock);
92 EXPORT_SYMBOL(lock_fb_info);
98 int fb_get_color_depth(struct fb_var_screeninfo *var,
99 struct fb_fix_screeninfo *fix)
103 if (fix->visual == FB_VISUAL_MONO01 ||
104 fix->visual == FB_VISUAL_MONO10)
107 if (var->green.length == var->blue.length &&
108 var->green.length == var->red.length &&
109 var->green.offset == var->blue.offset &&
110 var->green.offset == var->red.offset)
111 depth = var->green.length;
113 depth = var->green.length + var->red.length +
119 EXPORT_SYMBOL(fb_get_color_depth);
122 * Data padding functions.
124 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
126 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
128 EXPORT_SYMBOL(fb_pad_aligned_buffer);
130 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
131 u32 shift_high, u32 shift_low, u32 mod)
133 u8 mask = (u8) (0xfff << shift_high), tmp;
136 for (i = height; i--; ) {
137 for (j = 0; j < idx; j++) {
140 tmp |= *src >> shift_low;
142 tmp = *src << shift_high;
148 tmp |= *src >> shift_low;
150 if (shift_high < mod) {
151 tmp = *src << shift_high;
158 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
161 * we need to lock this section since fb_cursor
162 * may use fb_imageblit()
164 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
166 u32 align = buf->buf_align - 1, offset;
167 char *addr = buf->addr;
169 /* If IO mapped, we need to sync before access, no sharing of
172 if (buf->flags & FB_PIXMAP_IO) {
173 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
174 info->fbops->fb_sync(info);
178 /* See if we fit in the remaining pixmap space */
179 offset = buf->offset + align;
181 if (offset + size > buf->size) {
182 /* We do not fit. In order to be able to re-use the buffer,
183 * we must ensure no asynchronous DMA'ing or whatever operation
184 * is in progress, we sync for that.
186 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
187 info->fbops->fb_sync(info);
190 buf->offset = offset + size;
195 EXPORT_SYMBOL(fb_get_buffer_offset);
199 static inline unsigned safe_shift(unsigned d, int n)
201 return n < 0 ? d >> -n : d << n;
204 static void fb_set_logocmap(struct fb_info *info,
205 const struct linux_logo *logo)
207 struct fb_cmap palette_cmap;
208 u16 palette_green[16];
209 u16 palette_blue[16];
212 const unsigned char *clut = logo->clut;
214 palette_cmap.start = 0;
215 palette_cmap.len = 16;
216 palette_cmap.red = palette_red;
217 palette_cmap.green = palette_green;
218 palette_cmap.blue = palette_blue;
219 palette_cmap.transp = NULL;
221 for (i = 0; i < logo->clutsize; i += n) {
222 n = logo->clutsize - i;
223 /* palette_cmap provides space for only 16 colors at once */
226 palette_cmap.start = 32 + i;
227 palette_cmap.len = n;
228 for (j = 0; j < n; ++j) {
229 palette_cmap.red[j] = clut[0] << 8 | clut[0];
230 palette_cmap.green[j] = clut[1] << 8 | clut[1];
231 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
234 fb_set_cmap(&palette_cmap, info);
238 static void fb_set_logo_truepalette(struct fb_info *info,
239 const struct linux_logo *logo,
242 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
243 unsigned char redmask, greenmask, bluemask;
244 int redshift, greenshift, blueshift;
246 const unsigned char *clut = logo->clut;
249 * We have to create a temporary palette since console palette is only
252 /* Bug: Doesn't obey msb_right ... (who needs that?) */
253 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
254 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
255 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
256 redshift = info->var.red.offset - (8 - info->var.red.length);
257 greenshift = info->var.green.offset - (8 - info->var.green.length);
258 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
260 for ( i = 0; i < logo->clutsize; i++) {
261 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
262 safe_shift((clut[1] & greenmask), greenshift) |
263 safe_shift((clut[2] & bluemask), blueshift));
268 static void fb_set_logo_directpalette(struct fb_info *info,
269 const struct linux_logo *logo,
272 int redshift, greenshift, blueshift;
275 redshift = info->var.red.offset;
276 greenshift = info->var.green.offset;
277 blueshift = info->var.blue.offset;
279 for (i = 32; i < 32 + logo->clutsize; i++)
280 palette[i] = i << redshift | i << greenshift | i << blueshift;
283 static void fb_set_logo(struct fb_info *info,
284 const struct linux_logo *logo, u8 *dst,
288 const u8 *src = logo->data;
289 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
292 switch (fb_get_color_depth(&info->var, &info->fix)) {
304 if (info->fix.visual == FB_VISUAL_MONO01 ||
305 info->fix.visual == FB_VISUAL_MONO10)
306 fg = ~((u8) (0xfff << info->var.green.length));
310 for (i = 0; i < logo->height; i++)
311 for (j = 0; j < logo->width; src++) {
314 if (j < logo->width) {
315 *dst++ = *src & 0x0f;
321 for (i = 0; i < logo->height; i++) {
322 for (j = 0; j < logo->width; src++) {
324 for (k = 7; k >= 0 && j < logo->width; k--) {
325 *dst++ = ((d >> k) & 1) ? fg : 0;
335 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
336 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
337 * the visual format and color depth of the framebuffer, the DAC, the
338 * pseudo_palette, and the logo data will be adjusted accordingly.
340 * Case 1 - linux_logo_clut224:
341 * Color exceeds the number of console colors (16), thus we set the hardware DAC
342 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
344 * For visuals that require color info from the pseudo_palette, we also construct
345 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
348 * Case 2 - linux_logo_vga16:
349 * The number of colors just matches the console colors, thus there is no need
350 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
351 * each byte contains color information for two pixels (upper and lower nibble).
352 * To be consistent with fb_imageblit() usage, we therefore separate the two
353 * nibbles into separate bytes. The "depth" flag will be set to 4.
355 * Case 3 - linux_logo_mono:
356 * This is similar with Case 2. Each byte contains information for 8 pixels.
357 * We isolate each bit and expand each into a byte. The "depth" flag will
360 static struct logo_data {
362 int needs_directpalette;
363 int needs_truepalette;
365 const struct linux_logo *logo;
366 } fb_logo __read_mostly;
368 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
370 u32 size = width * height, i;
374 for (i = size; i--; )
378 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
380 int i, j, h = height - 1;
382 for (i = 0; i < height; i++)
383 for (j = 0; j < width; j++)
384 out[height * j + h - i] = *in++;
387 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
389 int i, j, w = width - 1;
391 for (i = 0; i < height; i++)
392 for (j = 0; j < width; j++)
393 out[height * (w - j) + i] = *in++;
396 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
397 struct fb_image *image, int rotate)
401 if (rotate == FB_ROTATE_UD) {
402 fb_rotate_logo_ud(image->data, dst, image->width,
404 image->dx = info->var.xres - image->width - image->dx;
405 image->dy = info->var.yres - image->height - image->dy;
406 } else if (rotate == FB_ROTATE_CW) {
407 fb_rotate_logo_cw(image->data, dst, image->width,
410 image->width = image->height;
413 image->dy = image->dx;
414 image->dx = info->var.xres - image->width - tmp;
415 } else if (rotate == FB_ROTATE_CCW) {
416 fb_rotate_logo_ccw(image->data, dst, image->width,
419 image->width = image->height;
422 image->dx = image->dy;
423 image->dy = info->var.yres - image->height - tmp;
429 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
430 int rotate, unsigned int num)
434 if (rotate == FB_ROTATE_UR) {
436 x < num && image->dx + image->width <= info->var.xres;
438 info->fbops->fb_imageblit(info, image);
439 image->dx += image->width + 8;
441 } else if (rotate == FB_ROTATE_UD) {
444 for (x = 0; x < num && image->dx <= dx; x++) {
445 info->fbops->fb_imageblit(info, image);
446 image->dx -= image->width + 8;
448 } else if (rotate == FB_ROTATE_CW) {
450 x < num && image->dy + image->height <= info->var.yres;
452 info->fbops->fb_imageblit(info, image);
453 image->dy += image->height + 8;
455 } else if (rotate == FB_ROTATE_CCW) {
458 for (x = 0; x < num && image->dy <= dy; x++) {
459 info->fbops->fb_imageblit(info, image);
460 image->dy -= image->height + 8;
465 static int fb_show_logo_line(struct fb_info *info, int rotate,
466 const struct linux_logo *logo, int y,
469 u32 *palette = NULL, *saved_pseudo_palette = NULL;
470 unsigned char *logo_new = NULL, *logo_rotate = NULL;
471 struct fb_image image;
473 /* Return if the frame buffer is not mapped or suspended */
474 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
479 image.data = logo->data;
481 if (fb_logo.needs_cmapreset)
482 fb_set_logocmap(info, logo);
484 if (fb_logo.needs_truepalette ||
485 fb_logo.needs_directpalette) {
486 palette = kmalloc(256 * 4, GFP_KERNEL);
490 if (fb_logo.needs_truepalette)
491 fb_set_logo_truepalette(info, logo, palette);
493 fb_set_logo_directpalette(info, logo, palette);
495 saved_pseudo_palette = info->pseudo_palette;
496 info->pseudo_palette = palette;
499 if (fb_logo.depth <= 4) {
500 logo_new = kmalloc_array(logo->width, logo->height,
502 if (logo_new == NULL) {
504 if (saved_pseudo_palette)
505 info->pseudo_palette = saved_pseudo_palette;
508 image.data = logo_new;
509 fb_set_logo(info, logo, logo_new, fb_logo.depth);
512 if (fb_center_logo) {
513 int xres = info->var.xres;
514 int yres = info->var.yres;
516 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
517 xres = info->var.yres;
518 yres = info->var.xres;
521 while (n && (n * (logo->width + 8) - 8 > xres))
523 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
524 image.dy = y ?: (yres - logo->height) / 2;
530 image.width = logo->width;
531 image.height = logo->height;
534 logo_rotate = kmalloc_array(logo->width, logo->height,
537 fb_rotate_logo(info, logo_rotate, &image, rotate);
540 fb_do_show_logo(info, &image, rotate, n);
543 if (saved_pseudo_palette != NULL)
544 info->pseudo_palette = saved_pseudo_palette;
547 return image.dy + logo->height;
551 #ifdef CONFIG_FB_LOGO_EXTRA
553 #define FB_LOGO_EX_NUM_MAX 10
554 static struct logo_data_extra {
555 const struct linux_logo *logo;
557 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
558 static unsigned int fb_logo_ex_num;
560 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
562 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
565 fb_logo_ex[fb_logo_ex_num].logo = logo;
566 fb_logo_ex[fb_logo_ex_num].n = n;
570 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
575 /* FIXME: logo_ex supports only truecolor fb. */
576 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
579 for (i = 0; i < fb_logo_ex_num; i++) {
580 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
581 fb_logo_ex[i].logo = NULL;
584 height += fb_logo_ex[i].logo->height;
586 height -= fb_logo_ex[i].logo->height;
594 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
598 for (i = 0; i < fb_logo_ex_num; i++)
599 y = fb_show_logo_line(info, rotate,
600 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
605 #else /* !CONFIG_FB_LOGO_EXTRA */
607 static inline int fb_prepare_extra_logos(struct fb_info *info,
614 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
619 #endif /* CONFIG_FB_LOGO_EXTRA */
622 int fb_prepare_logo(struct fb_info *info, int rotate)
624 int depth = fb_get_color_depth(&info->var, &info->fix);
628 memset(&fb_logo, 0, sizeof(struct logo_data));
630 if (info->flags & FBINFO_MISC_TILEBLITTING ||
634 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
635 depth = info->var.blue.length;
636 if (info->var.red.length < depth)
637 depth = info->var.red.length;
638 if (info->var.green.length < depth)
639 depth = info->var.green.length;
642 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
643 /* assume console colormap */
647 /* Return if no suitable logo was found */
648 fb_logo.logo = fb_find_logo(depth);
654 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
655 yres = info->var.yres;
657 yres = info->var.xres;
659 if (fb_logo.logo->height > yres) {
664 /* What depth we asked for might be different from what we get */
665 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
667 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
673 if (fb_logo.depth > 4 && depth > 4) {
674 switch (info->fix.visual) {
675 case FB_VISUAL_TRUECOLOR:
676 fb_logo.needs_truepalette = 1;
678 case FB_VISUAL_DIRECTCOLOR:
679 fb_logo.needs_directpalette = 1;
680 fb_logo.needs_cmapreset = 1;
682 case FB_VISUAL_PSEUDOCOLOR:
683 fb_logo.needs_cmapreset = 1;
688 height = fb_logo.logo->height;
690 height += (yres - fb_logo.logo->height) / 2;
692 return fb_prepare_extra_logos(info, height, yres);
695 int fb_show_logo(struct fb_info *info, int rotate)
699 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
701 y = fb_show_extra_logos(info, y, rotate);
706 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
707 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
708 #endif /* CONFIG_LOGO */
709 EXPORT_SYMBOL(fb_prepare_logo);
710 EXPORT_SYMBOL(fb_show_logo);
712 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
714 mutex_lock(®istration_lock);
715 return (*pos < FB_MAX) ? pos : NULL;
718 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
721 return (*pos < FB_MAX) ? pos : NULL;
724 static void fb_seq_stop(struct seq_file *m, void *v)
726 mutex_unlock(®istration_lock);
729 static int fb_seq_show(struct seq_file *m, void *v)
731 int i = *(loff_t *)v;
732 struct fb_info *fi = registered_fb[i];
735 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
739 static const struct seq_operations proc_fb_seq_ops = {
740 .start = fb_seq_start,
747 * We hold a reference to the fb_info in file->private_data,
748 * but if the current registered fb has changed, we don't
749 * actually want to use it.
751 * So look up the fb_info using the inode minor number,
752 * and just verify it against the reference we have.
754 static struct fb_info *file_fb_info(struct file *file)
756 struct inode *inode = file_inode(file);
757 int fbidx = iminor(inode);
758 struct fb_info *info = registered_fb[fbidx];
760 if (info != file->private_data)
766 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
768 unsigned long p = *ppos;
769 struct fb_info *info = file_fb_info(file);
772 int c, cnt = 0, err = 0;
773 unsigned long total_size;
775 if (!info || ! info->screen_base)
778 if (info->state != FBINFO_STATE_RUNNING)
781 if (info->fbops->fb_read)
782 return info->fbops->fb_read(info, buf, count, ppos);
784 total_size = info->screen_size;
787 total_size = info->fix.smem_len;
792 if (count >= total_size)
795 if (count + p > total_size)
796 count = total_size - p;
798 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
803 src = (u8 __iomem *) (info->screen_base + p);
805 if (info->fbops->fb_sync)
806 info->fbops->fb_sync(info);
809 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
811 fb_memcpy_fromfb(dst, src, c);
815 if (copy_to_user(buf, buffer, c)) {
827 return (err) ? err : cnt;
831 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
833 unsigned long p = *ppos;
834 struct fb_info *info = file_fb_info(file);
837 int c, cnt = 0, err = 0;
838 unsigned long total_size;
840 if (!info || !info->screen_base)
843 if (info->state != FBINFO_STATE_RUNNING)
846 if (info->fbops->fb_write)
847 return info->fbops->fb_write(info, buf, count, ppos);
849 total_size = info->screen_size;
852 total_size = info->fix.smem_len;
857 if (count > total_size) {
862 if (count + p > total_size) {
866 count = total_size - p;
869 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
874 dst = (u8 __iomem *) (info->screen_base + p);
876 if (info->fbops->fb_sync)
877 info->fbops->fb_sync(info);
880 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
883 if (copy_from_user(src, buf, c)) {
888 fb_memcpy_tofb(dst, src, c);
899 return (cnt) ? cnt : err;
903 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
905 struct fb_fix_screeninfo *fix = &info->fix;
906 unsigned int yres = info->var.yres;
909 if (var->yoffset > 0) {
910 if (var->vmode & FB_VMODE_YWRAP) {
911 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
915 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
919 if (var->xoffset > 0 && (!fix->xpanstep ||
920 (var->xoffset % fix->xpanstep)))
923 if (err || !info->fbops->fb_pan_display ||
924 var->yoffset > info->var.yres_virtual - yres ||
925 var->xoffset > info->var.xres_virtual - info->var.xres)
928 if ((err = info->fbops->fb_pan_display(var, info)))
930 info->var.xoffset = var->xoffset;
931 info->var.yoffset = var->yoffset;
932 if (var->vmode & FB_VMODE_YWRAP)
933 info->var.vmode |= FB_VMODE_YWRAP;
935 info->var.vmode &= ~FB_VMODE_YWRAP;
938 EXPORT_SYMBOL(fb_pan_display);
940 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
943 struct fb_event event;
944 struct fb_blit_caps caps, fbcaps;
947 memset(&caps, 0, sizeof(caps));
948 memset(&fbcaps, 0, sizeof(fbcaps));
949 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
952 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
953 info->fbops->fb_get_caps(info, &fbcaps, var);
955 if (((fbcaps.x ^ caps.x) & caps.x) ||
956 ((fbcaps.y ^ caps.y) & caps.y) ||
957 (fbcaps.len < caps.len))
964 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
966 int flags = info->flags;
969 if (var->activate & FB_ACTIVATE_INV_MODE) {
970 struct fb_videomode mode1, mode2;
972 fb_var_to_videomode(&mode1, var);
973 fb_var_to_videomode(&mode2, &info->var);
974 /* make sure we don't delete the videomode of current var */
975 ret = fb_mode_is_equal(&mode1, &mode2);
978 struct fb_event event;
982 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
986 fb_delete_videomode(&mode1, &info->modelist);
989 ret = (ret) ? -EINVAL : 0;
993 if ((var->activate & FB_ACTIVATE_FORCE) ||
994 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
995 u32 activate = var->activate;
997 /* When using FOURCC mode, make sure the red, green, blue and
998 * transp fields are set to 0.
1000 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
1001 var->grayscale > 1) {
1002 if (var->red.offset || var->green.offset ||
1003 var->blue.offset || var->transp.offset ||
1004 var->red.length || var->green.length ||
1005 var->blue.length || var->transp.length ||
1006 var->red.msb_right || var->green.msb_right ||
1007 var->blue.msb_right || var->transp.msb_right)
1011 if (!info->fbops->fb_check_var) {
1016 ret = info->fbops->fb_check_var(var, info);
1021 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1022 struct fb_var_screeninfo old_var;
1023 struct fb_videomode mode;
1025 if (info->fbops->fb_get_caps) {
1026 ret = fb_check_caps(info, var, activate);
1032 old_var = info->var;
1035 if (info->fbops->fb_set_par) {
1036 ret = info->fbops->fb_set_par(info);
1039 info->var = old_var;
1040 printk(KERN_WARNING "detected "
1041 "fb_set_par error, "
1042 "error code: %d\n", ret);
1047 fb_pan_display(info, &info->var);
1048 fb_set_cmap(&info->cmap, info);
1049 fb_var_to_videomode(&mode, &info->var);
1051 if (info->modelist.prev && info->modelist.next &&
1052 !list_empty(&info->modelist))
1053 ret = fb_add_videomode(&mode, &info->modelist);
1055 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1056 struct fb_event event;
1057 int evnt = (activate & FB_ACTIVATE_ALL) ?
1058 FB_EVENT_MODE_CHANGE_ALL :
1059 FB_EVENT_MODE_CHANGE;
1061 info->flags &= ~FBINFO_MISC_USEREVENT;
1064 fb_notifier_call_chain(evnt, &event);
1072 EXPORT_SYMBOL(fb_set_var);
1075 fb_blank(struct fb_info *info, int blank)
1077 struct fb_event event;
1078 int ret = -EINVAL, early_ret;
1080 if (blank > FB_BLANK_POWERDOWN)
1081 blank = FB_BLANK_POWERDOWN;
1084 event.data = ␣
1086 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1088 if (info->fbops->fb_blank)
1089 ret = info->fbops->fb_blank(blank, info);
1092 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1095 * if fb_blank is failed then revert effects of
1096 * the early blank event.
1099 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1104 EXPORT_SYMBOL(fb_blank);
1106 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1110 struct fb_var_screeninfo var;
1111 struct fb_fix_screeninfo fix;
1112 struct fb_con2fbmap con2fb;
1113 struct fb_cmap cmap_from;
1114 struct fb_cmap_user cmap;
1115 struct fb_event event;
1116 void __user *argp = (void __user *)arg;
1120 case FBIOGET_VSCREENINFO:
1121 if (!lock_fb_info(info))
1124 unlock_fb_info(info);
1126 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1128 case FBIOPUT_VSCREENINFO:
1129 if (copy_from_user(&var, argp, sizeof(var)))
1132 if (!lock_fb_info(info)) {
1136 info->flags |= FBINFO_MISC_USEREVENT;
1137 ret = fb_set_var(info, &var);
1138 info->flags &= ~FBINFO_MISC_USEREVENT;
1139 unlock_fb_info(info);
1141 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1144 case FBIOGET_FSCREENINFO:
1145 if (!lock_fb_info(info))
1148 if (info->flags & FBINFO_HIDE_SMEM_START)
1150 unlock_fb_info(info);
1152 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1155 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1157 ret = fb_set_user_cmap(&cmap, info);
1160 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1162 if (!lock_fb_info(info))
1164 cmap_from = info->cmap;
1165 unlock_fb_info(info);
1166 ret = fb_cmap_to_user(&cmap_from, &cmap);
1168 case FBIOPAN_DISPLAY:
1169 if (copy_from_user(&var, argp, sizeof(var)))
1172 if (!lock_fb_info(info)) {
1176 ret = fb_pan_display(info, &var);
1177 unlock_fb_info(info);
1179 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1185 case FBIOGET_CON2FBMAP:
1186 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1188 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1190 con2fb.framebuffer = -1;
1191 event.data = &con2fb;
1192 if (!lock_fb_info(info))
1195 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1196 unlock_fb_info(info);
1197 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1199 case FBIOPUT_CON2FBMAP:
1200 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1202 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1204 if (con2fb.framebuffer >= FB_MAX)
1206 if (!registered_fb[con2fb.framebuffer])
1207 request_module("fb%d", con2fb.framebuffer);
1208 if (!registered_fb[con2fb.framebuffer]) {
1212 event.data = &con2fb;
1214 if (!lock_fb_info(info)) {
1219 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1220 unlock_fb_info(info);
1225 if (!lock_fb_info(info)) {
1229 info->flags |= FBINFO_MISC_USEREVENT;
1230 ret = fb_blank(info, arg);
1231 info->flags &= ~FBINFO_MISC_USEREVENT;
1232 unlock_fb_info(info);
1236 if (!lock_fb_info(info))
1240 ret = fb->fb_ioctl(info, cmd, arg);
1243 unlock_fb_info(info);
1248 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1250 struct fb_info *info = file_fb_info(file);
1254 return do_fb_ioctl(info, cmd, arg);
1257 #ifdef CONFIG_COMPAT
1258 struct fb_fix_screeninfo32 {
1260 compat_caddr_t smem_start;
1269 compat_caddr_t mmio_start;
1279 compat_caddr_t green;
1280 compat_caddr_t blue;
1281 compat_caddr_t transp;
1284 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1287 struct fb_cmap_user __user *cmap;
1288 struct fb_cmap32 __user *cmap32;
1292 cmap = compat_alloc_user_space(sizeof(*cmap));
1293 cmap32 = compat_ptr(arg);
1295 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1298 if (get_user(data, &cmap32->red) ||
1299 put_user(compat_ptr(data), &cmap->red) ||
1300 get_user(data, &cmap32->green) ||
1301 put_user(compat_ptr(data), &cmap->green) ||
1302 get_user(data, &cmap32->blue) ||
1303 put_user(compat_ptr(data), &cmap->blue) ||
1304 get_user(data, &cmap32->transp) ||
1305 put_user(compat_ptr(data), &cmap->transp))
1308 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1311 if (copy_in_user(&cmap32->start,
1319 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1320 struct fb_fix_screeninfo32 __user *fix32)
1325 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1327 data = (__u32) (unsigned long) fix->smem_start;
1328 err |= put_user(data, &fix32->smem_start);
1330 err |= put_user(fix->smem_len, &fix32->smem_len);
1331 err |= put_user(fix->type, &fix32->type);
1332 err |= put_user(fix->type_aux, &fix32->type_aux);
1333 err |= put_user(fix->visual, &fix32->visual);
1334 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1335 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1336 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1337 err |= put_user(fix->line_length, &fix32->line_length);
1339 data = (__u32) (unsigned long) fix->mmio_start;
1340 err |= put_user(data, &fix32->mmio_start);
1342 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1343 err |= put_user(fix->accel, &fix32->accel);
1344 err |= copy_to_user(fix32->reserved, fix->reserved,
1345 sizeof(fix->reserved));
1352 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1355 struct fb_fix_screeninfo fix;
1357 if (!lock_fb_info(info))
1360 if (info->flags & FBINFO_HIDE_SMEM_START)
1362 unlock_fb_info(info);
1363 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1366 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1369 struct fb_info *info = file_fb_info(file);
1371 long ret = -ENOIOCTLCMD;
1377 case FBIOGET_VSCREENINFO:
1378 case FBIOPUT_VSCREENINFO:
1379 case FBIOPAN_DISPLAY:
1380 case FBIOGET_CON2FBMAP:
1381 case FBIOPUT_CON2FBMAP:
1382 arg = (unsigned long) compat_ptr(arg);
1385 ret = do_fb_ioctl(info, cmd, arg);
1388 case FBIOGET_FSCREENINFO:
1389 ret = fb_get_fscreeninfo(info, cmd, arg);
1394 ret = fb_getput_cmap(info, cmd, arg);
1398 if (fb->fb_compat_ioctl)
1399 ret = fb->fb_compat_ioctl(info, cmd, arg);
1407 fb_mmap(struct file *file, struct vm_area_struct * vma)
1409 struct fb_info *info = file_fb_info(file);
1411 unsigned long mmio_pgoff;
1412 unsigned long start;
1420 mutex_lock(&info->mm_lock);
1425 * The framebuffer needs to be accessed decrypted, be sure
1426 * SME protection is removed ahead of the call
1428 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1429 res = fb->fb_mmap(info, vma);
1430 mutex_unlock(&info->mm_lock);
1435 * Ugh. This can be either the frame buffer mapping, or
1436 * if pgoff points past it, the mmio mapping.
1438 start = info->fix.smem_start;
1439 len = info->fix.smem_len;
1440 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1441 if (vma->vm_pgoff >= mmio_pgoff) {
1442 if (info->var.accel_flags) {
1443 mutex_unlock(&info->mm_lock);
1447 vma->vm_pgoff -= mmio_pgoff;
1448 start = info->fix.mmio_start;
1449 len = info->fix.mmio_len;
1451 mutex_unlock(&info->mm_lock);
1453 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1455 * The framebuffer needs to be accessed decrypted, be sure
1456 * SME protection is removed
1458 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1459 fb_pgprotect(file, vma, start);
1461 return vm_iomap_memory(vma, start, len);
1465 fb_open(struct inode *inode, struct file *file)
1466 __acquires(&info->lock)
1467 __releases(&info->lock)
1469 int fbidx = iminor(inode);
1470 struct fb_info *info;
1473 info = get_fb_info(fbidx);
1475 request_module("fb%d", fbidx);
1476 info = get_fb_info(fbidx);
1481 return PTR_ERR(info);
1483 mutex_lock(&info->lock);
1484 if (!try_module_get(info->fbops->owner)) {
1488 file->private_data = info;
1489 if (info->fbops->fb_open) {
1490 res = info->fbops->fb_open(info,1);
1492 module_put(info->fbops->owner);
1494 #ifdef CONFIG_FB_DEFERRED_IO
1496 fb_deferred_io_open(info, inode, file);
1499 mutex_unlock(&info->lock);
1506 fb_release(struct inode *inode, struct file *file)
1507 __acquires(&info->lock)
1508 __releases(&info->lock)
1510 struct fb_info * const info = file->private_data;
1512 mutex_lock(&info->lock);
1513 if (info->fbops->fb_release)
1514 info->fbops->fb_release(info,1);
1515 module_put(info->fbops->owner);
1516 mutex_unlock(&info->lock);
1521 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1522 unsigned long get_fb_unmapped_area(struct file *filp,
1523 unsigned long addr, unsigned long len,
1524 unsigned long pgoff, unsigned long flags)
1526 struct fb_info * const info = filp->private_data;
1527 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1529 if (pgoff > fb_size || len > fb_size - pgoff)
1532 return (unsigned long)info->screen_base + pgoff;
1536 static const struct file_operations fb_fops = {
1537 .owner = THIS_MODULE,
1540 .unlocked_ioctl = fb_ioctl,
1541 #ifdef CONFIG_COMPAT
1542 .compat_ioctl = fb_compat_ioctl,
1546 .release = fb_release,
1547 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1548 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1549 !defined(CONFIG_MMU))
1550 .get_unmapped_area = get_fb_unmapped_area,
1552 #ifdef CONFIG_FB_DEFERRED_IO
1553 .fsync = fb_deferred_io_fsync,
1555 .llseek = default_llseek,
1558 struct class *fb_class;
1559 EXPORT_SYMBOL(fb_class);
1561 static int fb_check_foreignness(struct fb_info *fi)
1563 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1565 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1568 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1570 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1571 #endif /* __BIG_ENDIAN */
1573 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1574 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1575 "support this framebuffer\n", fi->fix.id);
1577 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1578 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1579 "support this framebuffer\n", fi->fix.id);
1586 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1588 /* is the generic aperture base the same as the HW one */
1589 if (gen->base == hw->base)
1591 /* is the generic aperture base inside the hw base->hw base+size */
1592 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1597 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1598 struct apertures_struct *hwa)
1604 for (i = 0; i < hwa->count; ++i) {
1605 struct aperture *h = &hwa->ranges[i];
1606 for (j = 0; j < gena->count; ++j) {
1607 struct aperture *g = &gena->ranges[j];
1608 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1609 (unsigned long long)g->base,
1610 (unsigned long long)g->size,
1611 (unsigned long long)h->base,
1612 (unsigned long long)h->size);
1613 if (apertures_overlap(g, h))
1621 static int do_unregister_framebuffer(struct fb_info *fb_info);
1623 #define VGA_FB_PHYS 0xA0000
1624 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1625 const char *name, bool primary)
1629 /* check all firmware fbs and kick off if the base addr overlaps */
1630 for_each_registered_fb(i) {
1631 struct apertures_struct *gen_aper;
1633 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1636 gen_aper = registered_fb[i]->apertures;
1637 if (fb_do_apertures_overlap(gen_aper, a) ||
1638 (primary && gen_aper && gen_aper->count &&
1639 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1641 printk(KERN_INFO "fb%d: switching to %s from %s\n",
1642 i, name, registered_fb[i]->fix.id);
1643 ret = do_unregister_framebuffer(registered_fb[i]);
1652 static bool lockless_register_fb;
1653 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1654 MODULE_PARM_DESC(lockless_register_fb,
1655 "Lockless framebuffer registration for debugging [default=off]");
1657 static int do_register_framebuffer(struct fb_info *fb_info)
1660 struct fb_event event;
1661 struct fb_videomode mode;
1663 if (fb_check_foreignness(fb_info))
1666 ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1668 fb_is_primary_device(fb_info));
1672 if (num_registered_fb == FB_MAX)
1675 num_registered_fb++;
1676 for (i = 0 ; i < FB_MAX; i++)
1677 if (!registered_fb[i])
1680 atomic_set(&fb_info->count, 1);
1681 mutex_init(&fb_info->lock);
1682 mutex_init(&fb_info->mm_lock);
1684 fb_info->dev = device_create(fb_class, fb_info->device,
1685 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1686 if (IS_ERR(fb_info->dev)) {
1688 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1689 fb_info->dev = NULL;
1691 fb_init_device(fb_info);
1693 if (fb_info->pixmap.addr == NULL) {
1694 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1695 if (fb_info->pixmap.addr) {
1696 fb_info->pixmap.size = FBPIXMAPSIZE;
1697 fb_info->pixmap.buf_align = 1;
1698 fb_info->pixmap.scan_align = 1;
1699 fb_info->pixmap.access_align = 32;
1700 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1703 fb_info->pixmap.offset = 0;
1705 if (!fb_info->pixmap.blit_x)
1706 fb_info->pixmap.blit_x = ~(u32)0;
1708 if (!fb_info->pixmap.blit_y)
1709 fb_info->pixmap.blit_y = ~(u32)0;
1711 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1712 INIT_LIST_HEAD(&fb_info->modelist);
1714 if (fb_info->skip_vt_switch)
1715 pm_vt_switch_required(fb_info->dev, false);
1717 pm_vt_switch_required(fb_info->dev, true);
1719 fb_var_to_videomode(&mode, &fb_info->var);
1720 fb_add_videomode(&mode, &fb_info->modelist);
1721 registered_fb[i] = fb_info;
1723 event.info = fb_info;
1724 if (!lockless_register_fb)
1727 atomic_inc(&ignore_console_lock_warning);
1728 if (!lock_fb_info(fb_info)) {
1730 goto unlock_console;
1734 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1735 unlock_fb_info(fb_info);
1737 if (!lockless_register_fb)
1740 atomic_dec(&ignore_console_lock_warning);
1744 static int unbind_console(struct fb_info *fb_info)
1746 struct fb_event event;
1748 int i = fb_info->node;
1750 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1754 if (!lock_fb_info(fb_info)) {
1759 event.info = fb_info;
1760 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1761 unlock_fb_info(fb_info);
1767 static int __unlink_framebuffer(struct fb_info *fb_info);
1769 static int do_unregister_framebuffer(struct fb_info *fb_info)
1771 struct fb_event event;
1774 ret = unbind_console(fb_info);
1779 pm_vt_switch_unregister(fb_info->dev);
1781 __unlink_framebuffer(fb_info);
1782 if (fb_info->pixmap.addr &&
1783 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1784 kfree(fb_info->pixmap.addr);
1785 fb_destroy_modelist(&fb_info->modelist);
1786 registered_fb[fb_info->node] = NULL;
1787 num_registered_fb--;
1788 fb_cleanup_device(fb_info);
1789 event.info = fb_info;
1791 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1794 /* this may free fb info */
1795 put_fb_info(fb_info);
1799 static int __unlink_framebuffer(struct fb_info *fb_info)
1804 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1808 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1809 fb_info->dev = NULL;
1815 int unlink_framebuffer(struct fb_info *fb_info)
1819 ret = __unlink_framebuffer(fb_info);
1823 unbind_console(fb_info);
1827 EXPORT_SYMBOL(unlink_framebuffer);
1830 * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1831 * @a: memory range, users of which are to be removed
1832 * @name: requesting driver name
1833 * @primary: also kick vga16fb if present
1835 * This function removes framebuffer devices (initialized by firmware/bootloader)
1836 * which use memory range described by @a. If @a is NULL all such devices are
1839 int remove_conflicting_framebuffers(struct apertures_struct *a,
1840 const char *name, bool primary)
1843 bool do_free = false;
1846 a = alloc_apertures(1);
1850 a->ranges[0].base = 0;
1851 a->ranges[0].size = ~0;
1855 mutex_lock(®istration_lock);
1856 ret = do_remove_conflicting_framebuffers(a, name, primary);
1857 mutex_unlock(®istration_lock);
1864 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1867 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1869 * @res_id: index of PCI BAR configuring framebuffer memory
1870 * @name: requesting driver name
1872 * This function removes framebuffer devices (eg. initialized by firmware)
1873 * using memory range configured for @pdev's BAR @res_id.
1875 * The function assumes that PCI device with shadowed ROM drives a primary
1876 * display and so kicks out vga16fb.
1878 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
1880 struct apertures_struct *ap;
1881 bool primary = false;
1884 ap = alloc_apertures(1);
1888 ap->ranges[0].base = pci_resource_start(pdev, res_id);
1889 ap->ranges[0].size = pci_resource_len(pdev, res_id);
1891 primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1892 IORESOURCE_ROM_SHADOW;
1894 err = remove_conflicting_framebuffers(ap, name, primary);
1898 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1901 * register_framebuffer - registers a frame buffer device
1902 * @fb_info: frame buffer info structure
1904 * Registers a frame buffer device @fb_info.
1906 * Returns negative errno on error, or zero for success.
1910 register_framebuffer(struct fb_info *fb_info)
1914 mutex_lock(®istration_lock);
1915 ret = do_register_framebuffer(fb_info);
1916 mutex_unlock(®istration_lock);
1920 EXPORT_SYMBOL(register_framebuffer);
1923 * unregister_framebuffer - releases a frame buffer device
1924 * @fb_info: frame buffer info structure
1926 * Unregisters a frame buffer device @fb_info.
1928 * Returns negative errno on error, or zero for success.
1930 * This function will also notify the framebuffer console
1931 * to release the driver.
1933 * This is meant to be called within a driver's module_exit()
1934 * function. If this is called outside module_exit(), ensure
1935 * that the driver implements fb_open() and fb_release() to
1936 * check that no processes are using the device.
1939 unregister_framebuffer(struct fb_info *fb_info)
1943 mutex_lock(®istration_lock);
1944 ret = do_unregister_framebuffer(fb_info);
1945 mutex_unlock(®istration_lock);
1949 EXPORT_SYMBOL(unregister_framebuffer);
1952 * fb_set_suspend - low level driver signals suspend
1953 * @info: framebuffer affected
1954 * @state: 0 = resuming, !=0 = suspending
1956 * This is meant to be used by low level drivers to
1957 * signal suspend/resume to the core & clients.
1958 * It must be called with the console semaphore held
1960 void fb_set_suspend(struct fb_info *info, int state)
1962 struct fb_event event;
1966 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1967 info->state = FBINFO_STATE_SUSPENDED;
1969 info->state = FBINFO_STATE_RUNNING;
1970 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1973 EXPORT_SYMBOL(fb_set_suspend);
1976 * fbmem_init - init frame buffer subsystem
1978 * Initialize the frame buffer subsystem.
1980 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1989 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1992 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1994 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1998 fb_class = class_create(THIS_MODULE, "graphics");
1999 if (IS_ERR(fb_class)) {
2000 ret = PTR_ERR(fb_class);
2001 pr_warn("Unable to create fb class; errno = %d\n", ret);
2011 unregister_chrdev(FB_MAJOR, "fb");
2013 remove_proc_entry("fb", NULL);
2018 module_init(fbmem_init);
2024 remove_proc_entry("fb", NULL);
2025 class_destroy(fb_class);
2026 unregister_chrdev(FB_MAJOR, "fb");
2029 module_exit(fbmem_exit);
2030 MODULE_LICENSE("GPL");
2031 MODULE_DESCRIPTION("Framebuffer base");
2033 subsys_initcall(fbmem_init);
2036 int fb_new_modelist(struct fb_info *info)
2038 struct fb_event event;
2039 struct fb_var_screeninfo var = info->var;
2040 struct list_head *pos, *n;
2041 struct fb_modelist *modelist;
2042 struct fb_videomode *m, mode;
2045 list_for_each_safe(pos, n, &info->modelist) {
2046 modelist = list_entry(pos, struct fb_modelist, list);
2047 m = &modelist->mode;
2048 fb_videomode_to_var(&var, m);
2049 var.activate = FB_ACTIVATE_TEST;
2050 err = fb_set_var(info, &var);
2051 fb_var_to_videomode(&mode, &var);
2052 if (err || !fb_mode_is_equal(m, &mode)) {
2060 if (!list_empty(&info->modelist)) {
2062 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
2068 MODULE_LICENSE("GPL");