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/platform_device.h>
29 #include <linux/seq_file.h>
30 #include <linux/console.h>
31 #include <linux/kmod.h>
32 #include <linux/err.h>
33 #include <linux/device.h>
34 #include <linux/efi.h>
36 #include <linux/fbcon.h>
37 #include <linux/mem_encrypt.h>
38 #include <linux/pci.h>
44 * Frame buffer device initialization and setup routines
47 #define FBPIXMAPSIZE (1024 * 8)
49 static DEFINE_MUTEX(registration_lock);
51 struct fb_info *registered_fb[FB_MAX] __read_mostly;
52 EXPORT_SYMBOL(registered_fb);
54 int num_registered_fb __read_mostly;
55 EXPORT_SYMBOL(num_registered_fb);
57 bool fb_center_logo __read_mostly;
59 int fb_logo_count __read_mostly = -1;
61 static struct fb_info *get_fb_info(unsigned int idx)
63 struct fb_info *fb_info;
66 return ERR_PTR(-ENODEV);
68 mutex_lock(®istration_lock);
69 fb_info = registered_fb[idx];
71 refcount_inc(&fb_info->count);
72 mutex_unlock(®istration_lock);
77 static void put_fb_info(struct fb_info *fb_info)
79 if (!refcount_dec_and_test(&fb_info->count))
81 if (fb_info->fbops->fb_destroy)
82 fb_info->fbops->fb_destroy(fb_info);
89 int fb_get_color_depth(struct fb_var_screeninfo *var,
90 struct fb_fix_screeninfo *fix)
94 if (fix->visual == FB_VISUAL_MONO01 ||
95 fix->visual == FB_VISUAL_MONO10)
98 if (var->green.length == var->blue.length &&
99 var->green.length == var->red.length &&
100 var->green.offset == var->blue.offset &&
101 var->green.offset == var->red.offset)
102 depth = var->green.length;
104 depth = var->green.length + var->red.length +
110 EXPORT_SYMBOL(fb_get_color_depth);
113 * Data padding functions.
115 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
117 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
119 EXPORT_SYMBOL(fb_pad_aligned_buffer);
121 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
122 u32 shift_high, u32 shift_low, u32 mod)
124 u8 mask = (u8) (0xfff << shift_high), tmp;
127 for (i = height; i--; ) {
128 for (j = 0; j < idx; j++) {
131 tmp |= *src >> shift_low;
133 tmp = *src << shift_high;
139 tmp |= *src >> shift_low;
141 if (shift_high < mod) {
142 tmp = *src << shift_high;
149 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
152 * we need to lock this section since fb_cursor
153 * may use fb_imageblit()
155 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
157 u32 align = buf->buf_align - 1, offset;
158 char *addr = buf->addr;
160 /* If IO mapped, we need to sync before access, no sharing of
163 if (buf->flags & FB_PIXMAP_IO) {
164 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
165 info->fbops->fb_sync(info);
169 /* See if we fit in the remaining pixmap space */
170 offset = buf->offset + align;
172 if (offset + size > buf->size) {
173 /* We do not fit. In order to be able to re-use the buffer,
174 * we must ensure no asynchronous DMA'ing or whatever operation
175 * is in progress, we sync for that.
177 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
178 info->fbops->fb_sync(info);
181 buf->offset = offset + size;
186 EXPORT_SYMBOL(fb_get_buffer_offset);
190 static inline unsigned safe_shift(unsigned d, int n)
192 return n < 0 ? d >> -n : d << n;
195 static void fb_set_logocmap(struct fb_info *info,
196 const struct linux_logo *logo)
198 struct fb_cmap palette_cmap;
199 u16 palette_green[16];
200 u16 palette_blue[16];
203 const unsigned char *clut = logo->clut;
205 palette_cmap.start = 0;
206 palette_cmap.len = 16;
207 palette_cmap.red = palette_red;
208 palette_cmap.green = palette_green;
209 palette_cmap.blue = palette_blue;
210 palette_cmap.transp = NULL;
212 for (i = 0; i < logo->clutsize; i += n) {
213 n = logo->clutsize - i;
214 /* palette_cmap provides space for only 16 colors at once */
217 palette_cmap.start = 32 + i;
218 palette_cmap.len = n;
219 for (j = 0; j < n; ++j) {
220 palette_cmap.red[j] = clut[0] << 8 | clut[0];
221 palette_cmap.green[j] = clut[1] << 8 | clut[1];
222 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
225 fb_set_cmap(&palette_cmap, info);
229 static void fb_set_logo_truepalette(struct fb_info *info,
230 const struct linux_logo *logo,
233 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
234 unsigned char redmask, greenmask, bluemask;
235 int redshift, greenshift, blueshift;
237 const unsigned char *clut = logo->clut;
240 * We have to create a temporary palette since console palette is only
243 /* Bug: Doesn't obey msb_right ... (who needs that?) */
244 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
245 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
246 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
247 redshift = info->var.red.offset - (8 - info->var.red.length);
248 greenshift = info->var.green.offset - (8 - info->var.green.length);
249 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
251 for ( i = 0; i < logo->clutsize; i++) {
252 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
253 safe_shift((clut[1] & greenmask), greenshift) |
254 safe_shift((clut[2] & bluemask), blueshift));
259 static void fb_set_logo_directpalette(struct fb_info *info,
260 const struct linux_logo *logo,
263 int redshift, greenshift, blueshift;
266 redshift = info->var.red.offset;
267 greenshift = info->var.green.offset;
268 blueshift = info->var.blue.offset;
270 for (i = 32; i < 32 + logo->clutsize; i++)
271 palette[i] = i << redshift | i << greenshift | i << blueshift;
274 static void fb_set_logo(struct fb_info *info,
275 const struct linux_logo *logo, u8 *dst,
279 const u8 *src = logo->data;
280 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
283 switch (fb_get_color_depth(&info->var, &info->fix)) {
295 if (info->fix.visual == FB_VISUAL_MONO01 ||
296 info->fix.visual == FB_VISUAL_MONO10)
297 fg = ~((u8) (0xfff << info->var.green.length));
301 for (i = 0; i < logo->height; i++)
302 for (j = 0; j < logo->width; src++) {
305 if (j < logo->width) {
306 *dst++ = *src & 0x0f;
312 for (i = 0; i < logo->height; i++) {
313 for (j = 0; j < logo->width; src++) {
315 for (k = 7; k >= 0 && j < logo->width; k--) {
316 *dst++ = ((d >> k) & 1) ? fg : 0;
326 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
327 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
328 * the visual format and color depth of the framebuffer, the DAC, the
329 * pseudo_palette, and the logo data will be adjusted accordingly.
331 * Case 1 - linux_logo_clut224:
332 * Color exceeds the number of console colors (16), thus we set the hardware DAC
333 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
335 * For visuals that require color info from the pseudo_palette, we also construct
336 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
339 * Case 2 - linux_logo_vga16:
340 * The number of colors just matches the console colors, thus there is no need
341 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
342 * each byte contains color information for two pixels (upper and lower nibble).
343 * To be consistent with fb_imageblit() usage, we therefore separate the two
344 * nibbles into separate bytes. The "depth" flag will be set to 4.
346 * Case 3 - linux_logo_mono:
347 * This is similar with Case 2. Each byte contains information for 8 pixels.
348 * We isolate each bit and expand each into a byte. The "depth" flag will
351 static struct logo_data {
353 int needs_directpalette;
354 int needs_truepalette;
356 const struct linux_logo *logo;
357 } fb_logo __read_mostly;
359 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
361 u32 size = width * height, i;
365 for (i = size; i--; )
369 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
371 int i, j, h = height - 1;
373 for (i = 0; i < height; i++)
374 for (j = 0; j < width; j++)
375 out[height * j + h - i] = *in++;
378 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
380 int i, j, w = width - 1;
382 for (i = 0; i < height; i++)
383 for (j = 0; j < width; j++)
384 out[height * (w - j) + i] = *in++;
387 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
388 struct fb_image *image, int rotate)
392 if (rotate == FB_ROTATE_UD) {
393 fb_rotate_logo_ud(image->data, dst, image->width,
395 image->dx = info->var.xres - image->width - image->dx;
396 image->dy = info->var.yres - image->height - image->dy;
397 } else if (rotate == FB_ROTATE_CW) {
398 fb_rotate_logo_cw(image->data, dst, image->width,
401 image->width = image->height;
404 image->dy = image->dx;
405 image->dx = info->var.xres - image->width - tmp;
406 } else if (rotate == FB_ROTATE_CCW) {
407 fb_rotate_logo_ccw(image->data, dst, image->width,
410 image->width = image->height;
413 image->dx = image->dy;
414 image->dy = info->var.yres - image->height - tmp;
420 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
421 int rotate, unsigned int num)
425 if (image->width > info->var.xres || image->height > info->var.yres)
428 if (rotate == FB_ROTATE_UR) {
430 x < num && image->dx + image->width <= info->var.xres;
432 info->fbops->fb_imageblit(info, image);
433 image->dx += image->width + 8;
435 } else if (rotate == FB_ROTATE_UD) {
438 for (x = 0; x < num && image->dx <= dx; x++) {
439 info->fbops->fb_imageblit(info, image);
440 image->dx -= image->width + 8;
442 } else if (rotate == FB_ROTATE_CW) {
444 x < num && image->dy + image->height <= info->var.yres;
446 info->fbops->fb_imageblit(info, image);
447 image->dy += image->height + 8;
449 } else if (rotate == FB_ROTATE_CCW) {
452 for (x = 0; x < num && image->dy <= dy; x++) {
453 info->fbops->fb_imageblit(info, image);
454 image->dy -= image->height + 8;
459 static int fb_show_logo_line(struct fb_info *info, int rotate,
460 const struct linux_logo *logo, int y,
463 u32 *palette = NULL, *saved_pseudo_palette = NULL;
464 unsigned char *logo_new = NULL, *logo_rotate = NULL;
465 struct fb_image image;
467 /* Return if the frame buffer is not mapped or suspended */
468 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
473 image.data = logo->data;
475 if (fb_logo.needs_cmapreset)
476 fb_set_logocmap(info, logo);
478 if (fb_logo.needs_truepalette ||
479 fb_logo.needs_directpalette) {
480 palette = kmalloc(256 * 4, GFP_KERNEL);
484 if (fb_logo.needs_truepalette)
485 fb_set_logo_truepalette(info, logo, palette);
487 fb_set_logo_directpalette(info, logo, palette);
489 saved_pseudo_palette = info->pseudo_palette;
490 info->pseudo_palette = palette;
493 if (fb_logo.depth <= 4) {
494 logo_new = kmalloc_array(logo->width, logo->height,
496 if (logo_new == NULL) {
498 if (saved_pseudo_palette)
499 info->pseudo_palette = saved_pseudo_palette;
502 image.data = logo_new;
503 fb_set_logo(info, logo, logo_new, fb_logo.depth);
506 if (fb_center_logo) {
507 int xres = info->var.xres;
508 int yres = info->var.yres;
510 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
511 xres = info->var.yres;
512 yres = info->var.xres;
515 while (n && (n * (logo->width + 8) - 8 > xres))
517 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
518 image.dy = y ?: (yres - logo->height) / 2;
524 image.width = logo->width;
525 image.height = logo->height;
528 logo_rotate = kmalloc_array(logo->width, logo->height,
531 fb_rotate_logo(info, logo_rotate, &image, rotate);
534 fb_do_show_logo(info, &image, rotate, n);
537 if (saved_pseudo_palette != NULL)
538 info->pseudo_palette = saved_pseudo_palette;
541 return image.dy + logo->height;
545 #ifdef CONFIG_FB_LOGO_EXTRA
547 #define FB_LOGO_EX_NUM_MAX 10
548 static struct logo_data_extra {
549 const struct linux_logo *logo;
551 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
552 static unsigned int fb_logo_ex_num;
554 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
556 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
559 fb_logo_ex[fb_logo_ex_num].logo = logo;
560 fb_logo_ex[fb_logo_ex_num].n = n;
564 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
569 /* FIXME: logo_ex supports only truecolor fb. */
570 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
573 for (i = 0; i < fb_logo_ex_num; i++) {
574 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
575 fb_logo_ex[i].logo = NULL;
578 height += fb_logo_ex[i].logo->height;
580 height -= fb_logo_ex[i].logo->height;
588 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
592 for (i = 0; i < fb_logo_ex_num; i++)
593 y = fb_show_logo_line(info, rotate,
594 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
599 #else /* !CONFIG_FB_LOGO_EXTRA */
601 static inline int fb_prepare_extra_logos(struct fb_info *info,
608 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
613 #endif /* CONFIG_FB_LOGO_EXTRA */
616 int fb_prepare_logo(struct fb_info *info, int rotate)
618 int depth = fb_get_color_depth(&info->var, &info->fix);
622 memset(&fb_logo, 0, sizeof(struct logo_data));
624 if (info->flags & FBINFO_MISC_TILEBLITTING ||
625 info->fbops->owner || !fb_logo_count)
628 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
629 depth = info->var.blue.length;
630 if (info->var.red.length < depth)
631 depth = info->var.red.length;
632 if (info->var.green.length < depth)
633 depth = info->var.green.length;
636 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
637 /* assume console colormap */
641 /* Return if no suitable logo was found */
642 fb_logo.logo = fb_find_logo(depth);
648 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
649 yres = info->var.yres;
651 yres = info->var.xres;
653 if (fb_logo.logo->height > yres) {
658 /* What depth we asked for might be different from what we get */
659 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
661 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
667 if (fb_logo.depth > 4 && depth > 4) {
668 switch (info->fix.visual) {
669 case FB_VISUAL_TRUECOLOR:
670 fb_logo.needs_truepalette = 1;
672 case FB_VISUAL_DIRECTCOLOR:
673 fb_logo.needs_directpalette = 1;
674 fb_logo.needs_cmapreset = 1;
676 case FB_VISUAL_PSEUDOCOLOR:
677 fb_logo.needs_cmapreset = 1;
682 height = fb_logo.logo->height;
684 height += (yres - fb_logo.logo->height) / 2;
686 return fb_prepare_extra_logos(info, height, yres);
689 int fb_show_logo(struct fb_info *info, int rotate)
697 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
698 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
699 y = fb_show_extra_logos(info, y, rotate);
704 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
705 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
706 #endif /* CONFIG_LOGO */
707 EXPORT_SYMBOL(fb_prepare_logo);
708 EXPORT_SYMBOL(fb_show_logo);
710 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
712 mutex_lock(®istration_lock);
713 return (*pos < FB_MAX) ? pos : NULL;
716 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
719 return (*pos < FB_MAX) ? pos : NULL;
722 static void fb_seq_stop(struct seq_file *m, void *v)
724 mutex_unlock(®istration_lock);
727 static int fb_seq_show(struct seq_file *m, void *v)
729 int i = *(loff_t *)v;
730 struct fb_info *fi = registered_fb[i];
733 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
737 static const struct seq_operations __maybe_unused proc_fb_seq_ops = {
738 .start = fb_seq_start,
745 * We hold a reference to the fb_info in file->private_data,
746 * but if the current registered fb has changed, we don't
747 * actually want to use it.
749 * So look up the fb_info using the inode minor number,
750 * and just verify it against the reference we have.
752 static struct fb_info *file_fb_info(struct file *file)
754 struct inode *inode = file_inode(file);
755 int fbidx = iminor(inode);
756 struct fb_info *info = registered_fb[fbidx];
758 if (info != file->private_data)
764 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
766 unsigned long p = *ppos;
767 struct fb_info *info = file_fb_info(file);
770 int c, cnt = 0, err = 0;
771 unsigned long total_size;
773 if (!info || ! info->screen_base)
776 if (info->state != FBINFO_STATE_RUNNING)
779 if (info->fbops->fb_read)
780 return info->fbops->fb_read(info, buf, count, ppos);
782 total_size = info->screen_size;
785 total_size = info->fix.smem_len;
790 if (count >= total_size)
793 if (count + p > total_size)
794 count = total_size - p;
796 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
801 src = (u8 __iomem *) (info->screen_base + p);
803 if (info->fbops->fb_sync)
804 info->fbops->fb_sync(info);
807 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
809 fb_memcpy_fromfb(dst, src, c);
813 if (copy_to_user(buf, buffer, c)) {
825 return (err) ? err : cnt;
829 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
831 unsigned long p = *ppos;
832 struct fb_info *info = file_fb_info(file);
835 int c, cnt = 0, err = 0;
836 unsigned long total_size;
838 if (!info || !info->screen_base)
841 if (info->state != FBINFO_STATE_RUNNING)
844 if (info->fbops->fb_write)
845 return info->fbops->fb_write(info, buf, count, ppos);
847 total_size = info->screen_size;
850 total_size = info->fix.smem_len;
855 if (count > total_size) {
860 if (count + p > total_size) {
864 count = total_size - p;
867 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
872 dst = (u8 __iomem *) (info->screen_base + p);
874 if (info->fbops->fb_sync)
875 info->fbops->fb_sync(info);
878 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
881 if (copy_from_user(src, buf, c)) {
886 fb_memcpy_tofb(dst, src, c);
897 return (cnt) ? cnt : err;
901 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
903 struct fb_fix_screeninfo *fix = &info->fix;
904 unsigned int yres = info->var.yres;
907 if (var->yoffset > 0) {
908 if (var->vmode & FB_VMODE_YWRAP) {
909 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
913 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
917 if (var->xoffset > 0 && (!fix->xpanstep ||
918 (var->xoffset % fix->xpanstep)))
921 if (err || !info->fbops->fb_pan_display ||
922 var->yoffset > info->var.yres_virtual - yres ||
923 var->xoffset > info->var.xres_virtual - info->var.xres)
926 if ((err = info->fbops->fb_pan_display(var, info)))
928 info->var.xoffset = var->xoffset;
929 info->var.yoffset = var->yoffset;
930 if (var->vmode & FB_VMODE_YWRAP)
931 info->var.vmode |= FB_VMODE_YWRAP;
933 info->var.vmode &= ~FB_VMODE_YWRAP;
936 EXPORT_SYMBOL(fb_pan_display);
938 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
941 struct fb_blit_caps caps, fbcaps;
944 memset(&caps, 0, sizeof(caps));
945 memset(&fbcaps, 0, sizeof(fbcaps));
946 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
947 fbcon_get_requirement(info, &caps);
948 info->fbops->fb_get_caps(info, &fbcaps, var);
950 if (((fbcaps.x ^ caps.x) & caps.x) ||
951 ((fbcaps.y ^ caps.y) & caps.y) ||
952 (fbcaps.len < caps.len))
959 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
963 struct fb_var_screeninfo old_var;
964 struct fb_videomode mode;
965 struct fb_event event;
968 if (var->activate & FB_ACTIVATE_INV_MODE) {
969 struct fb_videomode mode1, mode2;
971 fb_var_to_videomode(&mode1, var);
972 fb_var_to_videomode(&mode2, &info->var);
973 /* make sure we don't delete the videomode of current var */
974 ret = fb_mode_is_equal(&mode1, &mode2);
976 ret = fbcon_mode_deleted(info, &mode1);
978 fb_delete_videomode(&mode1, &info->modelist);
981 return ret ? -EINVAL : 0;
984 if (!(var->activate & FB_ACTIVATE_FORCE) &&
985 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
988 activate = var->activate;
990 /* When using FOURCC mode, make sure the red, green, blue and
991 * transp fields are set to 0.
993 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
994 var->grayscale > 1) {
995 if (var->red.offset || var->green.offset ||
996 var->blue.offset || var->transp.offset ||
997 var->red.length || var->green.length ||
998 var->blue.length || var->transp.length ||
999 var->red.msb_right || var->green.msb_right ||
1000 var->blue.msb_right || var->transp.msb_right)
1004 if (!info->fbops->fb_check_var) {
1009 /* bitfill_aligned() assumes that it's at least 8x8 */
1010 if (var->xres < 8 || var->yres < 8)
1013 /* Too huge resolution causes multiplication overflow. */
1014 if (check_mul_overflow(var->xres, var->yres, &unused) ||
1015 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
1018 ret = info->fbops->fb_check_var(var, info);
1023 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1026 if (info->fbops->fb_get_caps) {
1027 ret = fb_check_caps(info, var, activate);
1033 old_var = info->var;
1036 if (info->fbops->fb_set_par) {
1037 ret = info->fbops->fb_set_par(info);
1040 info->var = old_var;
1041 printk(KERN_WARNING "detected "
1042 "fb_set_par error, "
1043 "error code: %d\n", ret);
1048 fb_pan_display(info, &info->var);
1049 fb_set_cmap(&info->cmap, info);
1050 fb_var_to_videomode(&mode, &info->var);
1052 if (info->modelist.prev && info->modelist.next &&
1053 !list_empty(&info->modelist))
1054 ret = fb_add_videomode(&mode, &info->modelist);
1061 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1065 EXPORT_SYMBOL(fb_set_var);
1068 fb_blank(struct fb_info *info, int blank)
1070 struct fb_event event;
1073 if (blank > FB_BLANK_POWERDOWN)
1074 blank = FB_BLANK_POWERDOWN;
1077 event.data = ␣
1079 if (info->fbops->fb_blank)
1080 ret = info->fbops->fb_blank(blank, info);
1083 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1087 EXPORT_SYMBOL(fb_blank);
1089 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1092 const struct fb_ops *fb;
1093 struct fb_var_screeninfo var;
1094 struct fb_fix_screeninfo fix;
1095 struct fb_cmap cmap_from;
1096 struct fb_cmap_user cmap;
1097 void __user *argp = (void __user *)arg;
1101 case FBIOGET_VSCREENINFO:
1104 unlock_fb_info(info);
1106 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1108 case FBIOPUT_VSCREENINFO:
1109 if (copy_from_user(&var, argp, sizeof(var)))
1113 ret = fb_set_var(info, &var);
1115 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1116 unlock_fb_info(info);
1118 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1121 case FBIOGET_FSCREENINFO:
1123 memcpy(&fix, &info->fix, sizeof(fix));
1124 if (info->flags & FBINFO_HIDE_SMEM_START)
1126 unlock_fb_info(info);
1128 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1131 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1133 ret = fb_set_user_cmap(&cmap, info);
1136 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1139 cmap_from = info->cmap;
1140 unlock_fb_info(info);
1141 ret = fb_cmap_to_user(&cmap_from, &cmap);
1143 case FBIOPAN_DISPLAY:
1144 if (copy_from_user(&var, argp, sizeof(var)))
1148 ret = fb_pan_display(info, &var);
1149 unlock_fb_info(info);
1151 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1157 case FBIOGET_CON2FBMAP:
1158 ret = fbcon_get_con2fb_map_ioctl(argp);
1160 case FBIOPUT_CON2FBMAP:
1161 ret = fbcon_set_con2fb_map_ioctl(argp);
1166 ret = fb_blank(info, arg);
1167 /* might again call into fb_blank */
1168 fbcon_fb_blanked(info, arg);
1169 unlock_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_cmap32 cmap32;
1224 struct fb_cmap cmap_from;
1225 struct fb_cmap_user cmap;
1227 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32)))
1230 cmap = (struct fb_cmap_user) {
1231 .start = cmap32.start,
1233 .red = compat_ptr(cmap32.red),
1234 .green = compat_ptr(cmap32.green),
1235 .blue = compat_ptr(cmap32.blue),
1236 .transp = compat_ptr(cmap32.transp),
1239 if (cmd == FBIOPUTCMAP)
1240 return fb_set_user_cmap(&cmap, info);
1243 cmap_from = info->cmap;
1244 unlock_fb_info(info);
1246 return fb_cmap_to_user(&cmap_from, &cmap);
1249 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1250 struct fb_fix_screeninfo32 __user *fix32)
1255 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1257 data = (__u32) (unsigned long) fix->smem_start;
1258 err |= put_user(data, &fix32->smem_start);
1260 err |= put_user(fix->smem_len, &fix32->smem_len);
1261 err |= put_user(fix->type, &fix32->type);
1262 err |= put_user(fix->type_aux, &fix32->type_aux);
1263 err |= put_user(fix->visual, &fix32->visual);
1264 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1265 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1266 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1267 err |= put_user(fix->line_length, &fix32->line_length);
1269 data = (__u32) (unsigned long) fix->mmio_start;
1270 err |= put_user(data, &fix32->mmio_start);
1272 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1273 err |= put_user(fix->accel, &fix32->accel);
1274 err |= copy_to_user(fix32->reserved, fix->reserved,
1275 sizeof(fix->reserved));
1282 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1285 struct fb_fix_screeninfo fix;
1289 if (info->flags & FBINFO_HIDE_SMEM_START)
1291 unlock_fb_info(info);
1292 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1295 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1298 struct fb_info *info = file_fb_info(file);
1299 const struct fb_ops *fb;
1300 long ret = -ENOIOCTLCMD;
1306 case FBIOGET_VSCREENINFO:
1307 case FBIOPUT_VSCREENINFO:
1308 case FBIOPAN_DISPLAY:
1309 case FBIOGET_CON2FBMAP:
1310 case FBIOPUT_CON2FBMAP:
1311 arg = (unsigned long) compat_ptr(arg);
1314 ret = do_fb_ioctl(info, cmd, arg);
1317 case FBIOGET_FSCREENINFO:
1318 ret = fb_get_fscreeninfo(info, cmd, arg);
1323 ret = fb_getput_cmap(info, cmd, arg);
1327 if (fb->fb_compat_ioctl)
1328 ret = fb->fb_compat_ioctl(info, cmd, arg);
1336 fb_mmap(struct file *file, struct vm_area_struct * vma)
1338 struct fb_info *info = file_fb_info(file);
1339 int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma);
1340 unsigned long mmio_pgoff;
1341 unsigned long start;
1346 mutex_lock(&info->mm_lock);
1348 fb_mmap_fn = info->fbops->fb_mmap;
1350 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1352 fb_mmap_fn = fb_deferred_io_mmap;
1359 * The framebuffer needs to be accessed decrypted, be sure
1360 * SME protection is removed ahead of the call
1362 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1363 res = fb_mmap_fn(info, vma);
1364 mutex_unlock(&info->mm_lock);
1369 * Ugh. This can be either the frame buffer mapping, or
1370 * if pgoff points past it, the mmio mapping.
1372 start = info->fix.smem_start;
1373 len = info->fix.smem_len;
1374 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1375 if (vma->vm_pgoff >= mmio_pgoff) {
1376 if (info->var.accel_flags) {
1377 mutex_unlock(&info->mm_lock);
1381 vma->vm_pgoff -= mmio_pgoff;
1382 start = info->fix.mmio_start;
1383 len = info->fix.mmio_len;
1385 mutex_unlock(&info->mm_lock);
1387 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1388 fb_pgprotect(file, vma, start);
1390 return vm_iomap_memory(vma, start, len);
1394 fb_open(struct inode *inode, struct file *file)
1395 __acquires(&info->lock)
1396 __releases(&info->lock)
1398 int fbidx = iminor(inode);
1399 struct fb_info *info;
1402 info = get_fb_info(fbidx);
1404 request_module("fb%d", fbidx);
1405 info = get_fb_info(fbidx);
1410 return PTR_ERR(info);
1413 if (!try_module_get(info->fbops->owner)) {
1417 file->private_data = info;
1418 if (info->fbops->fb_open) {
1419 res = info->fbops->fb_open(info,1);
1421 module_put(info->fbops->owner);
1423 #ifdef CONFIG_FB_DEFERRED_IO
1425 fb_deferred_io_open(info, inode, file);
1428 unlock_fb_info(info);
1435 fb_release(struct inode *inode, struct file *file)
1436 __acquires(&info->lock)
1437 __releases(&info->lock)
1439 struct fb_info * const info = file->private_data;
1442 if (info->fbops->fb_release)
1443 info->fbops->fb_release(info,1);
1444 module_put(info->fbops->owner);
1445 unlock_fb_info(info);
1450 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1451 unsigned long get_fb_unmapped_area(struct file *filp,
1452 unsigned long addr, unsigned long len,
1453 unsigned long pgoff, unsigned long flags)
1455 struct fb_info * const info = filp->private_data;
1456 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1458 if (pgoff > fb_size || len > fb_size - pgoff)
1461 return (unsigned long)info->screen_base + pgoff;
1465 static const struct file_operations fb_fops = {
1466 .owner = THIS_MODULE,
1469 .unlocked_ioctl = fb_ioctl,
1470 #ifdef CONFIG_COMPAT
1471 .compat_ioctl = fb_compat_ioctl,
1475 .release = fb_release,
1476 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1477 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1478 !defined(CONFIG_MMU))
1479 .get_unmapped_area = get_fb_unmapped_area,
1481 #ifdef CONFIG_FB_DEFERRED_IO
1482 .fsync = fb_deferred_io_fsync,
1484 .llseek = default_llseek,
1487 struct class *fb_class;
1488 EXPORT_SYMBOL(fb_class);
1490 static int fb_check_foreignness(struct fb_info *fi)
1492 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1494 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1497 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1499 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1500 #endif /* __BIG_ENDIAN */
1502 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1503 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1504 "support this framebuffer\n", fi->fix.id);
1506 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1507 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1508 "support this framebuffer\n", fi->fix.id);
1515 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1517 /* is the generic aperture base the same as the HW one */
1518 if (gen->base == hw->base)
1520 /* is the generic aperture base inside the hw base->hw base+size */
1521 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1526 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1527 struct apertures_struct *hwa)
1533 for (i = 0; i < hwa->count; ++i) {
1534 struct aperture *h = &hwa->ranges[i];
1535 for (j = 0; j < gena->count; ++j) {
1536 struct aperture *g = &gena->ranges[j];
1537 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1538 (unsigned long long)g->base,
1539 (unsigned long long)g->size,
1540 (unsigned long long)h->base,
1541 (unsigned long long)h->size);
1542 if (apertures_overlap(g, h))
1550 static void do_unregister_framebuffer(struct fb_info *fb_info);
1552 #define VGA_FB_PHYS 0xA0000
1553 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1554 const char *name, bool primary)
1558 /* check all firmware fbs and kick off if the base addr overlaps */
1559 for_each_registered_fb(i) {
1560 struct apertures_struct *gen_aper;
1561 struct device *device;
1563 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1566 gen_aper = registered_fb[i]->apertures;
1567 device = registered_fb[i]->device;
1568 if (fb_do_apertures_overlap(gen_aper, a) ||
1569 (primary && gen_aper && gen_aper->count &&
1570 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1572 printk(KERN_INFO "fb%d: switching to %s from %s\n",
1573 i, name, registered_fb[i]->fix.id);
1576 * If we kick-out a firmware driver, we also want to remove
1577 * the underlying platform device, such as simple-framebuffer,
1578 * VESA, EFI, etc. A native driver will then be able to
1579 * allocate the memory range.
1581 * If it's not a platform device, at least print a warning. A
1582 * fix would add code to remove the device from the system.
1584 if (dev_is_platform(device)) {
1585 registered_fb[i]->forced_out = true;
1586 platform_device_unregister(to_platform_device(device));
1588 pr_warn("fb%d: cannot remove device\n", i);
1589 do_unregister_framebuffer(registered_fb[i]);
1595 static bool lockless_register_fb;
1596 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1597 MODULE_PARM_DESC(lockless_register_fb,
1598 "Lockless framebuffer registration for debugging [default=off]");
1600 static int do_register_framebuffer(struct fb_info *fb_info)
1603 struct fb_videomode mode;
1605 if (fb_check_foreignness(fb_info))
1608 do_remove_conflicting_framebuffers(fb_info->apertures,
1610 fb_is_primary_device(fb_info));
1612 if (num_registered_fb == FB_MAX)
1615 num_registered_fb++;
1616 for (i = 0 ; i < FB_MAX; i++)
1617 if (!registered_fb[i])
1620 refcount_set(&fb_info->count, 1);
1621 mutex_init(&fb_info->lock);
1622 mutex_init(&fb_info->mm_lock);
1624 fb_info->dev = device_create(fb_class, fb_info->device,
1625 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1626 if (IS_ERR(fb_info->dev)) {
1628 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1629 fb_info->dev = NULL;
1631 fb_init_device(fb_info);
1633 if (fb_info->pixmap.addr == NULL) {
1634 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1635 if (fb_info->pixmap.addr) {
1636 fb_info->pixmap.size = FBPIXMAPSIZE;
1637 fb_info->pixmap.buf_align = 1;
1638 fb_info->pixmap.scan_align = 1;
1639 fb_info->pixmap.access_align = 32;
1640 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1643 fb_info->pixmap.offset = 0;
1645 if (!fb_info->pixmap.blit_x)
1646 fb_info->pixmap.blit_x = ~(u32)0;
1648 if (!fb_info->pixmap.blit_y)
1649 fb_info->pixmap.blit_y = ~(u32)0;
1651 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1652 INIT_LIST_HEAD(&fb_info->modelist);
1654 if (fb_info->skip_vt_switch)
1655 pm_vt_switch_required(fb_info->dev, false);
1657 pm_vt_switch_required(fb_info->dev, true);
1659 fb_var_to_videomode(&mode, &fb_info->var);
1660 fb_add_videomode(&mode, &fb_info->modelist);
1661 registered_fb[i] = fb_info;
1663 #ifdef CONFIG_GUMSTIX_AM200EPD
1665 struct fb_event event;
1666 event.info = fb_info;
1667 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1671 if (!lockless_register_fb)
1674 atomic_inc(&ignore_console_lock_warning);
1675 lock_fb_info(fb_info);
1676 ret = fbcon_fb_registered(fb_info);
1677 unlock_fb_info(fb_info);
1679 if (!lockless_register_fb)
1682 atomic_dec(&ignore_console_lock_warning);
1686 static void unbind_console(struct fb_info *fb_info)
1688 int i = fb_info->node;
1690 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1694 lock_fb_info(fb_info);
1695 fbcon_fb_unbind(fb_info);
1696 unlock_fb_info(fb_info);
1700 static void unlink_framebuffer(struct fb_info *fb_info)
1705 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1711 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1713 pm_vt_switch_unregister(fb_info->dev);
1715 unbind_console(fb_info);
1717 fb_info->dev = NULL;
1720 static void do_unregister_framebuffer(struct fb_info *fb_info)
1722 unlink_framebuffer(fb_info);
1723 if (fb_info->pixmap.addr &&
1724 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) {
1725 kfree(fb_info->pixmap.addr);
1726 fb_info->pixmap.addr = NULL;
1729 fb_destroy_modelist(&fb_info->modelist);
1730 registered_fb[fb_info->node] = NULL;
1731 num_registered_fb--;
1732 fb_cleanup_device(fb_info);
1733 #ifdef CONFIG_GUMSTIX_AM200EPD
1735 struct fb_event event;
1736 event.info = fb_info;
1737 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1741 fbcon_fb_unregistered(fb_info);
1744 /* this may free fb info */
1745 put_fb_info(fb_info);
1749 * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1750 * @a: memory range, users of which are to be removed
1751 * @name: requesting driver name
1752 * @primary: also kick vga16fb if present
1754 * This function removes framebuffer devices (initialized by firmware/bootloader)
1755 * which use memory range described by @a. If @a is NULL all such devices are
1758 int remove_conflicting_framebuffers(struct apertures_struct *a,
1759 const char *name, bool primary)
1761 bool do_free = false;
1764 a = alloc_apertures(1);
1768 a->ranges[0].base = 0;
1769 a->ranges[0].size = ~0;
1773 mutex_lock(®istration_lock);
1774 do_remove_conflicting_framebuffers(a, name, primary);
1775 mutex_unlock(®istration_lock);
1782 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1785 * is_firmware_framebuffer - detect if firmware-configured framebuffer matches
1786 * @a: memory range, users of which are to be checked
1788 * This function checks framebuffer devices (initialized by firmware/bootloader)
1789 * which use memory range described by @a. If @a matchesm the function returns
1790 * true, otherwise false.
1792 bool is_firmware_framebuffer(struct apertures_struct *a)
1794 bool do_free = false;
1799 a = alloc_apertures(1);
1803 a->ranges[0].base = 0;
1804 a->ranges[0].size = ~0;
1808 mutex_lock(®istration_lock);
1809 /* check all firmware fbs and kick off if the base addr overlaps */
1810 for_each_registered_fb(i) {
1811 struct apertures_struct *gen_aper;
1813 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1816 gen_aper = registered_fb[i]->apertures;
1817 if (fb_do_apertures_overlap(gen_aper, a)) {
1822 mutex_unlock(®istration_lock);
1829 EXPORT_SYMBOL(is_firmware_framebuffer);
1832 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1834 * @name: requesting driver name
1836 * This function removes framebuffer devices (eg. initialized by firmware)
1837 * using memory range configured for any of @pdev's memory bars.
1839 * The function assumes that PCI device with shadowed ROM drives a primary
1840 * display and so kicks out vga16fb.
1842 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name)
1844 struct apertures_struct *ap;
1845 bool primary = false;
1848 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1849 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1854 ap = alloc_apertures(idx);
1858 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1859 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1861 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1862 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1863 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1864 (unsigned long)pci_resource_start(pdev, bar),
1865 (unsigned long)pci_resource_end(pdev, bar));
1870 primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1871 IORESOURCE_ROM_SHADOW;
1873 err = remove_conflicting_framebuffers(ap, name, primary);
1877 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1880 * register_framebuffer - registers a frame buffer device
1881 * @fb_info: frame buffer info structure
1883 * Registers a frame buffer device @fb_info.
1885 * Returns negative errno on error, or zero for success.
1889 register_framebuffer(struct fb_info *fb_info)
1893 mutex_lock(®istration_lock);
1894 ret = do_register_framebuffer(fb_info);
1895 mutex_unlock(®istration_lock);
1899 EXPORT_SYMBOL(register_framebuffer);
1902 * unregister_framebuffer - releases a frame buffer device
1903 * @fb_info: frame buffer info structure
1905 * Unregisters a frame buffer device @fb_info.
1907 * Returns negative errno on error, or zero for success.
1909 * This function will also notify the framebuffer console
1910 * to release the driver.
1912 * This is meant to be called within a driver's module_exit()
1913 * function. If this is called outside module_exit(), ensure
1914 * that the driver implements fb_open() and fb_release() to
1915 * check that no processes are using the device.
1918 unregister_framebuffer(struct fb_info *fb_info)
1920 bool forced_out = fb_info->forced_out;
1923 mutex_lock(®istration_lock);
1924 do_unregister_framebuffer(fb_info);
1926 mutex_unlock(®istration_lock);
1928 EXPORT_SYMBOL(unregister_framebuffer);
1931 * fb_set_suspend - low level driver signals suspend
1932 * @info: framebuffer affected
1933 * @state: 0 = resuming, !=0 = suspending
1935 * This is meant to be used by low level drivers to
1936 * signal suspend/resume to the core & clients.
1937 * It must be called with the console semaphore held
1939 void fb_set_suspend(struct fb_info *info, int state)
1941 WARN_CONSOLE_UNLOCKED();
1944 fbcon_suspended(info);
1945 info->state = FBINFO_STATE_SUSPENDED;
1947 info->state = FBINFO_STATE_RUNNING;
1948 fbcon_resumed(info);
1951 EXPORT_SYMBOL(fb_set_suspend);
1954 * fbmem_init - init frame buffer subsystem
1956 * Initialize the frame buffer subsystem.
1958 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1967 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1970 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1972 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1976 fb_class = class_create(THIS_MODULE, "graphics");
1977 if (IS_ERR(fb_class)) {
1978 ret = PTR_ERR(fb_class);
1979 pr_warn("Unable to create fb class; errno = %d\n", ret);
1989 unregister_chrdev(FB_MAJOR, "fb");
1991 remove_proc_entry("fb", NULL);
1996 module_init(fbmem_init);
2002 remove_proc_entry("fb", NULL);
2003 class_destroy(fb_class);
2004 unregister_chrdev(FB_MAJOR, "fb");
2007 module_exit(fbmem_exit);
2008 MODULE_LICENSE("GPL");
2009 MODULE_DESCRIPTION("Framebuffer base");
2011 subsys_initcall(fbmem_init);
2014 int fb_new_modelist(struct fb_info *info)
2016 struct fb_var_screeninfo var = info->var;
2017 struct list_head *pos, *n;
2018 struct fb_modelist *modelist;
2019 struct fb_videomode *m, mode;
2022 list_for_each_safe(pos, n, &info->modelist) {
2023 modelist = list_entry(pos, struct fb_modelist, list);
2024 m = &modelist->mode;
2025 fb_videomode_to_var(&var, m);
2026 var.activate = FB_ACTIVATE_TEST;
2027 err = fb_set_var(info, &var);
2028 fb_var_to_videomode(&mode, &var);
2029 if (err || !fb_mode_is_equal(m, &mode)) {
2035 if (list_empty(&info->modelist))
2038 fbcon_new_modelist(info);
2043 MODULE_LICENSE("GPL");