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>
42 #include <video/nomodeset.h>
43 #include <video/vga.h>
46 * Frame buffer device initialization and setup routines
49 #define FBPIXMAPSIZE (1024 * 8)
51 static DEFINE_MUTEX(registration_lock);
53 struct fb_info *registered_fb[FB_MAX] __read_mostly;
54 int num_registered_fb __read_mostly;
55 #define for_each_registered_fb(i) \
56 for (i = 0; i < FB_MAX; i++) \
57 if (!registered_fb[i]) {} else
59 bool fb_center_logo __read_mostly;
61 int fb_logo_count __read_mostly = -1;
63 static struct fb_info *get_fb_info(unsigned int idx)
65 struct fb_info *fb_info;
68 return ERR_PTR(-ENODEV);
70 mutex_lock(®istration_lock);
71 fb_info = registered_fb[idx];
73 refcount_inc(&fb_info->count);
74 mutex_unlock(®istration_lock);
79 static void put_fb_info(struct fb_info *fb_info)
81 if (!refcount_dec_and_test(&fb_info->count))
83 if (fb_info->fbops->fb_destroy)
84 fb_info->fbops->fb_destroy(fb_info);
91 int fb_get_color_depth(struct fb_var_screeninfo *var,
92 struct fb_fix_screeninfo *fix)
96 if (fix->visual == FB_VISUAL_MONO01 ||
97 fix->visual == FB_VISUAL_MONO10)
100 if (var->green.length == var->blue.length &&
101 var->green.length == var->red.length &&
102 var->green.offset == var->blue.offset &&
103 var->green.offset == var->red.offset)
104 depth = var->green.length;
106 depth = var->green.length + var->red.length +
112 EXPORT_SYMBOL(fb_get_color_depth);
115 * Data padding functions.
117 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
119 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
121 EXPORT_SYMBOL(fb_pad_aligned_buffer);
123 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
124 u32 shift_high, u32 shift_low, u32 mod)
126 u8 mask = (u8) (0xfff << shift_high), tmp;
129 for (i = height; i--; ) {
130 for (j = 0; j < idx; j++) {
133 tmp |= *src >> shift_low;
135 tmp = *src << shift_high;
141 tmp |= *src >> shift_low;
143 if (shift_high < mod) {
144 tmp = *src << shift_high;
151 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
154 * we need to lock this section since fb_cursor
155 * may use fb_imageblit()
157 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
159 u32 align = buf->buf_align - 1, offset;
160 char *addr = buf->addr;
162 /* If IO mapped, we need to sync before access, no sharing of
165 if (buf->flags & FB_PIXMAP_IO) {
166 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
167 info->fbops->fb_sync(info);
171 /* See if we fit in the remaining pixmap space */
172 offset = buf->offset + align;
174 if (offset + size > buf->size) {
175 /* We do not fit. In order to be able to re-use the buffer,
176 * we must ensure no asynchronous DMA'ing or whatever operation
177 * is in progress, we sync for that.
179 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
180 info->fbops->fb_sync(info);
183 buf->offset = offset + size;
188 EXPORT_SYMBOL(fb_get_buffer_offset);
192 static inline unsigned safe_shift(unsigned d, int n)
194 return n < 0 ? d >> -n : d << n;
197 static void fb_set_logocmap(struct fb_info *info,
198 const struct linux_logo *logo)
200 struct fb_cmap palette_cmap;
201 u16 palette_green[16];
202 u16 palette_blue[16];
205 const unsigned char *clut = logo->clut;
207 palette_cmap.start = 0;
208 palette_cmap.len = 16;
209 palette_cmap.red = palette_red;
210 palette_cmap.green = palette_green;
211 palette_cmap.blue = palette_blue;
212 palette_cmap.transp = NULL;
214 for (i = 0; i < logo->clutsize; i += n) {
215 n = logo->clutsize - i;
216 /* palette_cmap provides space for only 16 colors at once */
219 palette_cmap.start = 32 + i;
220 palette_cmap.len = n;
221 for (j = 0; j < n; ++j) {
222 palette_cmap.red[j] = clut[0] << 8 | clut[0];
223 palette_cmap.green[j] = clut[1] << 8 | clut[1];
224 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
227 fb_set_cmap(&palette_cmap, info);
231 static void fb_set_logo_truepalette(struct fb_info *info,
232 const struct linux_logo *logo,
235 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
236 unsigned char redmask, greenmask, bluemask;
237 int redshift, greenshift, blueshift;
239 const unsigned char *clut = logo->clut;
242 * We have to create a temporary palette since console palette is only
245 /* Bug: Doesn't obey msb_right ... (who needs that?) */
246 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
247 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
248 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
249 redshift = info->var.red.offset - (8 - info->var.red.length);
250 greenshift = info->var.green.offset - (8 - info->var.green.length);
251 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
253 for ( i = 0; i < logo->clutsize; i++) {
254 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
255 safe_shift((clut[1] & greenmask), greenshift) |
256 safe_shift((clut[2] & bluemask), blueshift));
261 static void fb_set_logo_directpalette(struct fb_info *info,
262 const struct linux_logo *logo,
265 int redshift, greenshift, blueshift;
268 redshift = info->var.red.offset;
269 greenshift = info->var.green.offset;
270 blueshift = info->var.blue.offset;
272 for (i = 32; i < 32 + logo->clutsize; i++)
273 palette[i] = i << redshift | i << greenshift | i << blueshift;
276 static void fb_set_logo(struct fb_info *info,
277 const struct linux_logo *logo, u8 *dst,
281 const u8 *src = logo->data;
282 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
285 switch (fb_get_color_depth(&info->var, &info->fix)) {
297 if (info->fix.visual == FB_VISUAL_MONO01 ||
298 info->fix.visual == FB_VISUAL_MONO10)
299 fg = ~((u8) (0xfff << info->var.green.length));
303 for (i = 0; i < logo->height; i++)
304 for (j = 0; j < logo->width; src++) {
307 if (j < logo->width) {
308 *dst++ = *src & 0x0f;
314 for (i = 0; i < logo->height; i++) {
315 for (j = 0; j < logo->width; src++) {
317 for (k = 7; k >= 0 && j < logo->width; k--) {
318 *dst++ = ((d >> k) & 1) ? fg : 0;
328 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
329 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
330 * the visual format and color depth of the framebuffer, the DAC, the
331 * pseudo_palette, and the logo data will be adjusted accordingly.
333 * Case 1 - linux_logo_clut224:
334 * Color exceeds the number of console colors (16), thus we set the hardware DAC
335 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
337 * For visuals that require color info from the pseudo_palette, we also construct
338 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
341 * Case 2 - linux_logo_vga16:
342 * The number of colors just matches the console colors, thus there is no need
343 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
344 * each byte contains color information for two pixels (upper and lower nibble).
345 * To be consistent with fb_imageblit() usage, we therefore separate the two
346 * nibbles into separate bytes. The "depth" flag will be set to 4.
348 * Case 3 - linux_logo_mono:
349 * This is similar with Case 2. Each byte contains information for 8 pixels.
350 * We isolate each bit and expand each into a byte. The "depth" flag will
353 static struct logo_data {
355 int needs_directpalette;
356 int needs_truepalette;
358 const struct linux_logo *logo;
359 } fb_logo __read_mostly;
361 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
363 u32 size = width * height, i;
367 for (i = size; i--; )
371 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
373 int i, j, h = height - 1;
375 for (i = 0; i < height; i++)
376 for (j = 0; j < width; j++)
377 out[height * j + h - i] = *in++;
380 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
382 int i, j, w = width - 1;
384 for (i = 0; i < height; i++)
385 for (j = 0; j < width; j++)
386 out[height * (w - j) + i] = *in++;
389 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
390 struct fb_image *image, int rotate)
394 if (rotate == FB_ROTATE_UD) {
395 fb_rotate_logo_ud(image->data, dst, image->width,
397 image->dx = info->var.xres - image->width - image->dx;
398 image->dy = info->var.yres - image->height - image->dy;
399 } else if (rotate == FB_ROTATE_CW) {
400 fb_rotate_logo_cw(image->data, dst, image->width,
402 swap(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,
409 swap(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 ||
623 info->fbops->owner || !fb_logo_count)
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)
695 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
696 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
697 y = fb_show_extra_logos(info, y, rotate);
702 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
703 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
704 #endif /* CONFIG_LOGO */
705 EXPORT_SYMBOL(fb_prepare_logo);
706 EXPORT_SYMBOL(fb_show_logo);
708 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
710 mutex_lock(®istration_lock);
711 return (*pos < FB_MAX) ? pos : NULL;
714 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
717 return (*pos < FB_MAX) ? pos : NULL;
720 static void fb_seq_stop(struct seq_file *m, void *v)
722 mutex_unlock(®istration_lock);
725 static int fb_seq_show(struct seq_file *m, void *v)
727 int i = *(loff_t *)v;
728 struct fb_info *fi = registered_fb[i];
731 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
735 static const struct seq_operations __maybe_unused proc_fb_seq_ops = {
736 .start = fb_seq_start,
743 * We hold a reference to the fb_info in file->private_data,
744 * but if the current registered fb has changed, we don't
745 * actually want to use it.
747 * So look up the fb_info using the inode minor number,
748 * and just verify it against the reference we have.
750 static struct fb_info *file_fb_info(struct file *file)
752 struct inode *inode = file_inode(file);
753 int fbidx = iminor(inode);
754 struct fb_info *info = registered_fb[fbidx];
756 if (info != file->private_data)
762 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
764 unsigned long p = *ppos;
765 struct fb_info *info = file_fb_info(file);
768 int c, cnt = 0, err = 0;
769 unsigned long total_size;
771 if (!info || ! info->screen_base)
774 if (info->state != FBINFO_STATE_RUNNING)
777 if (info->fbops->fb_read)
778 return info->fbops->fb_read(info, buf, count, ppos);
780 total_size = info->screen_size;
783 total_size = info->fix.smem_len;
788 if (count >= total_size)
791 if (count + p > total_size)
792 count = total_size - p;
794 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
799 src = (u8 __iomem *) (info->screen_base + p);
801 if (info->fbops->fb_sync)
802 info->fbops->fb_sync(info);
805 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
807 fb_memcpy_fromfb(dst, src, c);
811 if (copy_to_user(buf, buffer, c)) {
823 return (err) ? err : cnt;
827 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
829 unsigned long p = *ppos;
830 struct fb_info *info = file_fb_info(file);
833 int c, cnt = 0, err = 0;
834 unsigned long total_size;
836 if (!info || !info->screen_base)
839 if (info->state != FBINFO_STATE_RUNNING)
842 if (info->fbops->fb_write)
843 return info->fbops->fb_write(info, buf, count, ppos);
845 total_size = info->screen_size;
848 total_size = info->fix.smem_len;
853 if (count > total_size) {
858 if (count + p > total_size) {
862 count = total_size - p;
865 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
870 dst = (u8 __iomem *) (info->screen_base + p);
872 if (info->fbops->fb_sync)
873 info->fbops->fb_sync(info);
876 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
879 if (copy_from_user(src, buf, c)) {
884 fb_memcpy_tofb(dst, src, c);
895 return (cnt) ? cnt : err;
899 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
901 struct fb_fix_screeninfo *fix = &info->fix;
902 unsigned int yres = info->var.yres;
905 if (var->yoffset > 0) {
906 if (var->vmode & FB_VMODE_YWRAP) {
907 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
911 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
915 if (var->xoffset > 0 && (!fix->xpanstep ||
916 (var->xoffset % fix->xpanstep)))
919 if (err || !info->fbops->fb_pan_display ||
920 var->yoffset > info->var.yres_virtual - yres ||
921 var->xoffset > info->var.xres_virtual - info->var.xres)
924 if ((err = info->fbops->fb_pan_display(var, info)))
926 info->var.xoffset = var->xoffset;
927 info->var.yoffset = var->yoffset;
928 if (var->vmode & FB_VMODE_YWRAP)
929 info->var.vmode |= FB_VMODE_YWRAP;
931 info->var.vmode &= ~FB_VMODE_YWRAP;
934 EXPORT_SYMBOL(fb_pan_display);
936 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
939 struct fb_blit_caps caps, fbcaps;
942 memset(&caps, 0, sizeof(caps));
943 memset(&fbcaps, 0, sizeof(fbcaps));
944 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
945 fbcon_get_requirement(info, &caps);
946 info->fbops->fb_get_caps(info, &fbcaps, var);
948 if (((fbcaps.x ^ caps.x) & caps.x) ||
949 ((fbcaps.y ^ caps.y) & caps.y) ||
950 (fbcaps.len < caps.len))
957 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
961 struct fb_var_screeninfo old_var;
962 struct fb_videomode mode;
963 struct fb_event event;
966 if (var->activate & FB_ACTIVATE_INV_MODE) {
967 struct fb_videomode mode1, mode2;
969 fb_var_to_videomode(&mode1, var);
970 fb_var_to_videomode(&mode2, &info->var);
971 /* make sure we don't delete the videomode of current var */
972 ret = fb_mode_is_equal(&mode1, &mode2);
974 ret = fbcon_mode_deleted(info, &mode1);
976 fb_delete_videomode(&mode1, &info->modelist);
979 return ret ? -EINVAL : 0;
982 if (!(var->activate & FB_ACTIVATE_FORCE) &&
983 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
986 activate = var->activate;
988 /* When using FOURCC mode, make sure the red, green, blue and
989 * transp fields are set to 0.
991 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
992 var->grayscale > 1) {
993 if (var->red.offset || var->green.offset ||
994 var->blue.offset || var->transp.offset ||
995 var->red.length || var->green.length ||
996 var->blue.length || var->transp.length ||
997 var->red.msb_right || var->green.msb_right ||
998 var->blue.msb_right || var->transp.msb_right)
1002 if (!info->fbops->fb_check_var) {
1007 /* bitfill_aligned() assumes that it's at least 8x8 */
1008 if (var->xres < 8 || var->yres < 8)
1011 /* Too huge resolution causes multiplication overflow. */
1012 if (check_mul_overflow(var->xres, var->yres, &unused) ||
1013 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
1016 ret = info->fbops->fb_check_var(var, info);
1021 /* verify that virtual resolution >= physical resolution */
1022 if (var->xres_virtual < var->xres ||
1023 var->yres_virtual < var->yres) {
1024 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
1026 var->xres_virtual, var->yres_virtual,
1027 var->xres, var->yres);
1031 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1034 if (info->fbops->fb_get_caps) {
1035 ret = fb_check_caps(info, var, activate);
1041 old_var = info->var;
1044 if (info->fbops->fb_set_par) {
1045 ret = info->fbops->fb_set_par(info);
1048 info->var = old_var;
1049 printk(KERN_WARNING "detected "
1050 "fb_set_par error, "
1051 "error code: %d\n", ret);
1056 fb_pan_display(info, &info->var);
1057 fb_set_cmap(&info->cmap, info);
1058 fb_var_to_videomode(&mode, &info->var);
1060 if (info->modelist.prev && info->modelist.next &&
1061 !list_empty(&info->modelist))
1062 ret = fb_add_videomode(&mode, &info->modelist);
1069 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1073 EXPORT_SYMBOL(fb_set_var);
1076 fb_blank(struct fb_info *info, int blank)
1078 struct fb_event event;
1081 if (blank > FB_BLANK_POWERDOWN)
1082 blank = FB_BLANK_POWERDOWN;
1085 event.data = ␣
1087 if (info->fbops->fb_blank)
1088 ret = info->fbops->fb_blank(blank, info);
1091 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1095 EXPORT_SYMBOL(fb_blank);
1097 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1100 const struct fb_ops *fb;
1101 struct fb_var_screeninfo var;
1102 struct fb_fix_screeninfo fix;
1103 struct fb_cmap cmap_from;
1104 struct fb_cmap_user cmap;
1105 void __user *argp = (void __user *)arg;
1109 case FBIOGET_VSCREENINFO:
1112 unlock_fb_info(info);
1114 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1116 case FBIOPUT_VSCREENINFO:
1117 if (copy_from_user(&var, argp, sizeof(var)))
1121 ret = fbcon_modechange_possible(info, &var);
1123 ret = fb_set_var(info, &var);
1125 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1126 unlock_fb_info(info);
1128 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1131 case FBIOGET_FSCREENINFO:
1133 memcpy(&fix, &info->fix, sizeof(fix));
1134 if (info->flags & FBINFO_HIDE_SMEM_START)
1136 unlock_fb_info(info);
1138 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1141 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1143 ret = fb_set_user_cmap(&cmap, info);
1146 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1149 cmap_from = info->cmap;
1150 unlock_fb_info(info);
1151 ret = fb_cmap_to_user(&cmap_from, &cmap);
1153 case FBIOPAN_DISPLAY:
1154 if (copy_from_user(&var, argp, sizeof(var)))
1158 ret = fb_pan_display(info, &var);
1159 unlock_fb_info(info);
1161 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1167 case FBIOGET_CON2FBMAP:
1168 ret = fbcon_get_con2fb_map_ioctl(argp);
1170 case FBIOPUT_CON2FBMAP:
1171 ret = fbcon_set_con2fb_map_ioctl(argp);
1174 if (arg > FB_BLANK_POWERDOWN)
1178 ret = fb_blank(info, arg);
1179 /* might again call into fb_blank */
1180 fbcon_fb_blanked(info, arg);
1181 unlock_fb_info(info);
1188 ret = fb->fb_ioctl(info, cmd, arg);
1191 unlock_fb_info(info);
1196 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1198 struct fb_info *info = file_fb_info(file);
1202 return do_fb_ioctl(info, cmd, arg);
1205 #ifdef CONFIG_COMPAT
1206 struct fb_fix_screeninfo32 {
1208 compat_caddr_t smem_start;
1217 compat_caddr_t mmio_start;
1227 compat_caddr_t green;
1228 compat_caddr_t blue;
1229 compat_caddr_t transp;
1232 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1235 struct fb_cmap32 cmap32;
1236 struct fb_cmap cmap_from;
1237 struct fb_cmap_user cmap;
1239 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32)))
1242 cmap = (struct fb_cmap_user) {
1243 .start = cmap32.start,
1245 .red = compat_ptr(cmap32.red),
1246 .green = compat_ptr(cmap32.green),
1247 .blue = compat_ptr(cmap32.blue),
1248 .transp = compat_ptr(cmap32.transp),
1251 if (cmd == FBIOPUTCMAP)
1252 return fb_set_user_cmap(&cmap, info);
1255 cmap_from = info->cmap;
1256 unlock_fb_info(info);
1258 return fb_cmap_to_user(&cmap_from, &cmap);
1261 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1262 struct fb_fix_screeninfo32 __user *fix32)
1267 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1269 data = (__u32) (unsigned long) fix->smem_start;
1270 err |= put_user(data, &fix32->smem_start);
1272 err |= put_user(fix->smem_len, &fix32->smem_len);
1273 err |= put_user(fix->type, &fix32->type);
1274 err |= put_user(fix->type_aux, &fix32->type_aux);
1275 err |= put_user(fix->visual, &fix32->visual);
1276 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1277 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1278 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1279 err |= put_user(fix->line_length, &fix32->line_length);
1281 data = (__u32) (unsigned long) fix->mmio_start;
1282 err |= put_user(data, &fix32->mmio_start);
1284 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1285 err |= put_user(fix->accel, &fix32->accel);
1286 err |= copy_to_user(fix32->reserved, fix->reserved,
1287 sizeof(fix->reserved));
1294 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1297 struct fb_fix_screeninfo fix;
1301 if (info->flags & FBINFO_HIDE_SMEM_START)
1303 unlock_fb_info(info);
1304 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1307 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1310 struct fb_info *info = file_fb_info(file);
1311 const struct fb_ops *fb;
1312 long ret = -ENOIOCTLCMD;
1318 case FBIOGET_VSCREENINFO:
1319 case FBIOPUT_VSCREENINFO:
1320 case FBIOPAN_DISPLAY:
1321 case FBIOGET_CON2FBMAP:
1322 case FBIOPUT_CON2FBMAP:
1323 arg = (unsigned long) compat_ptr(arg);
1326 ret = do_fb_ioctl(info, cmd, arg);
1329 case FBIOGET_FSCREENINFO:
1330 ret = fb_get_fscreeninfo(info, cmd, arg);
1335 ret = fb_getput_cmap(info, cmd, arg);
1339 if (fb->fb_compat_ioctl)
1340 ret = fb->fb_compat_ioctl(info, cmd, arg);
1348 fb_mmap(struct file *file, struct vm_area_struct * vma)
1350 struct fb_info *info = file_fb_info(file);
1351 unsigned long mmio_pgoff;
1352 unsigned long start;
1357 mutex_lock(&info->mm_lock);
1359 if (info->fbops->fb_mmap) {
1363 * The framebuffer needs to be accessed decrypted, be sure
1364 * SME protection is removed ahead of the call
1366 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1367 res = info->fbops->fb_mmap(info, vma);
1368 mutex_unlock(&info->mm_lock);
1370 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1371 } else if (info->fbdefio) {
1373 * FB deferred I/O wants you to handle mmap in your drivers. At a
1374 * minimum, point struct fb_ops.fb_mmap to fb_deferred_io_mmap().
1376 dev_warn_once(info->dev, "fbdev mmap not set up for deferred I/O.\n");
1377 mutex_unlock(&info->mm_lock);
1383 * Ugh. This can be either the frame buffer mapping, or
1384 * if pgoff points past it, the mmio mapping.
1386 start = info->fix.smem_start;
1387 len = info->fix.smem_len;
1388 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1389 if (vma->vm_pgoff >= mmio_pgoff) {
1390 if (info->var.accel_flags) {
1391 mutex_unlock(&info->mm_lock);
1395 vma->vm_pgoff -= mmio_pgoff;
1396 start = info->fix.mmio_start;
1397 len = info->fix.mmio_len;
1399 mutex_unlock(&info->mm_lock);
1401 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1402 fb_pgprotect(file, vma, start);
1404 return vm_iomap_memory(vma, start, len);
1408 fb_open(struct inode *inode, struct file *file)
1409 __acquires(&info->lock)
1410 __releases(&info->lock)
1412 int fbidx = iminor(inode);
1413 struct fb_info *info;
1416 info = get_fb_info(fbidx);
1418 request_module("fb%d", fbidx);
1419 info = get_fb_info(fbidx);
1424 return PTR_ERR(info);
1427 if (!try_module_get(info->fbops->owner)) {
1431 file->private_data = info;
1432 if (info->fbops->fb_open) {
1433 res = info->fbops->fb_open(info,1);
1435 module_put(info->fbops->owner);
1437 #ifdef CONFIG_FB_DEFERRED_IO
1439 fb_deferred_io_open(info, inode, file);
1442 unlock_fb_info(info);
1449 fb_release(struct inode *inode, struct file *file)
1450 __acquires(&info->lock)
1451 __releases(&info->lock)
1453 struct fb_info * const info = file->private_data;
1456 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1458 fb_deferred_io_release(info);
1460 if (info->fbops->fb_release)
1461 info->fbops->fb_release(info,1);
1462 module_put(info->fbops->owner);
1463 unlock_fb_info(info);
1468 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1469 unsigned long get_fb_unmapped_area(struct file *filp,
1470 unsigned long addr, unsigned long len,
1471 unsigned long pgoff, unsigned long flags)
1473 struct fb_info * const info = filp->private_data;
1474 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1476 if (pgoff > fb_size || len > fb_size - pgoff)
1479 return (unsigned long)info->screen_base + pgoff;
1483 static const struct file_operations fb_fops = {
1484 .owner = THIS_MODULE,
1487 .unlocked_ioctl = fb_ioctl,
1488 #ifdef CONFIG_COMPAT
1489 .compat_ioctl = fb_compat_ioctl,
1493 .release = fb_release,
1494 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1495 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1496 !defined(CONFIG_MMU))
1497 .get_unmapped_area = get_fb_unmapped_area,
1499 #ifdef CONFIG_FB_DEFERRED_IO
1500 .fsync = fb_deferred_io_fsync,
1502 .llseek = default_llseek,
1505 struct class *fb_class;
1506 EXPORT_SYMBOL(fb_class);
1508 static int fb_check_foreignness(struct fb_info *fi)
1510 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1512 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1515 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1517 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1518 #endif /* __BIG_ENDIAN */
1520 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1521 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1522 "support this framebuffer\n", fi->fix.id);
1524 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1525 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1526 "support this framebuffer\n", fi->fix.id);
1533 static int do_register_framebuffer(struct fb_info *fb_info)
1536 struct fb_videomode mode;
1538 if (fb_check_foreignness(fb_info))
1541 if (num_registered_fb == FB_MAX)
1544 num_registered_fb++;
1545 for (i = 0 ; i < FB_MAX; i++)
1546 if (!registered_fb[i])
1549 refcount_set(&fb_info->count, 1);
1550 mutex_init(&fb_info->lock);
1551 mutex_init(&fb_info->mm_lock);
1553 fb_info->dev = device_create(fb_class, fb_info->device,
1554 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1555 if (IS_ERR(fb_info->dev)) {
1557 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1558 fb_info->dev = NULL;
1560 fb_init_device(fb_info);
1562 if (fb_info->pixmap.addr == NULL) {
1563 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1564 if (fb_info->pixmap.addr) {
1565 fb_info->pixmap.size = FBPIXMAPSIZE;
1566 fb_info->pixmap.buf_align = 1;
1567 fb_info->pixmap.scan_align = 1;
1568 fb_info->pixmap.access_align = 32;
1569 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1572 fb_info->pixmap.offset = 0;
1574 if (!fb_info->pixmap.blit_x)
1575 fb_info->pixmap.blit_x = ~(u32)0;
1577 if (!fb_info->pixmap.blit_y)
1578 fb_info->pixmap.blit_y = ~(u32)0;
1580 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1581 INIT_LIST_HEAD(&fb_info->modelist);
1583 if (fb_info->skip_vt_switch)
1584 pm_vt_switch_required(fb_info->dev, false);
1586 pm_vt_switch_required(fb_info->dev, true);
1588 fb_var_to_videomode(&mode, &fb_info->var);
1589 fb_add_videomode(&mode, &fb_info->modelist);
1590 registered_fb[i] = fb_info;
1592 #ifdef CONFIG_GUMSTIX_AM200EPD
1594 struct fb_event event;
1595 event.info = fb_info;
1596 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1600 return fbcon_fb_registered(fb_info);
1603 static void unbind_console(struct fb_info *fb_info)
1605 int i = fb_info->node;
1607 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1610 fbcon_fb_unbind(fb_info);
1613 static void unlink_framebuffer(struct fb_info *fb_info)
1618 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1624 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1626 pm_vt_switch_unregister(fb_info->dev);
1628 unbind_console(fb_info);
1630 fb_info->dev = NULL;
1633 static void do_unregister_framebuffer(struct fb_info *fb_info)
1635 unlink_framebuffer(fb_info);
1636 if (fb_info->pixmap.addr &&
1637 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) {
1638 kfree(fb_info->pixmap.addr);
1639 fb_info->pixmap.addr = NULL;
1642 fb_destroy_modelist(&fb_info->modelist);
1643 registered_fb[fb_info->node] = NULL;
1644 num_registered_fb--;
1645 fb_cleanup_device(fb_info);
1646 #ifdef CONFIG_GUMSTIX_AM200EPD
1648 struct fb_event event;
1649 event.info = fb_info;
1650 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1653 fbcon_fb_unregistered(fb_info);
1655 /* this may free fb info */
1656 put_fb_info(fb_info);
1660 * register_framebuffer - registers a frame buffer device
1661 * @fb_info: frame buffer info structure
1663 * Registers a frame buffer device @fb_info.
1665 * Returns negative errno on error, or zero for success.
1669 register_framebuffer(struct fb_info *fb_info)
1673 mutex_lock(®istration_lock);
1674 ret = do_register_framebuffer(fb_info);
1675 mutex_unlock(®istration_lock);
1679 EXPORT_SYMBOL(register_framebuffer);
1682 * unregister_framebuffer - releases a frame buffer device
1683 * @fb_info: frame buffer info structure
1685 * Unregisters a frame buffer device @fb_info.
1687 * Returns negative errno on error, or zero for success.
1689 * This function will also notify the framebuffer console
1690 * to release the driver.
1692 * This is meant to be called within a driver's module_exit()
1693 * function. If this is called outside module_exit(), ensure
1694 * that the driver implements fb_open() and fb_release() to
1695 * check that no processes are using the device.
1698 unregister_framebuffer(struct fb_info *fb_info)
1700 mutex_lock(®istration_lock);
1701 do_unregister_framebuffer(fb_info);
1702 mutex_unlock(®istration_lock);
1704 EXPORT_SYMBOL(unregister_framebuffer);
1707 * fb_set_suspend - low level driver signals suspend
1708 * @info: framebuffer affected
1709 * @state: 0 = resuming, !=0 = suspending
1711 * This is meant to be used by low level drivers to
1712 * signal suspend/resume to the core & clients.
1713 * It must be called with the console semaphore held
1715 void fb_set_suspend(struct fb_info *info, int state)
1717 WARN_CONSOLE_UNLOCKED();
1720 fbcon_suspended(info);
1721 info->state = FBINFO_STATE_SUSPENDED;
1723 info->state = FBINFO_STATE_RUNNING;
1724 fbcon_resumed(info);
1727 EXPORT_SYMBOL(fb_set_suspend);
1730 * fbmem_init - init frame buffer subsystem
1732 * Initialize the frame buffer subsystem.
1734 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1743 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1746 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1748 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1752 fb_class = class_create("graphics");
1753 if (IS_ERR(fb_class)) {
1754 ret = PTR_ERR(fb_class);
1755 pr_warn("Unable to create fb class; errno = %d\n", ret);
1765 unregister_chrdev(FB_MAJOR, "fb");
1767 remove_proc_entry("fb", NULL);
1772 module_init(fbmem_init);
1778 remove_proc_entry("fb", NULL);
1779 class_destroy(fb_class);
1780 unregister_chrdev(FB_MAJOR, "fb");
1783 module_exit(fbmem_exit);
1784 MODULE_LICENSE("GPL");
1785 MODULE_DESCRIPTION("Framebuffer base");
1787 subsys_initcall(fbmem_init);
1790 int fb_new_modelist(struct fb_info *info)
1792 struct fb_var_screeninfo var = info->var;
1793 struct list_head *pos, *n;
1794 struct fb_modelist *modelist;
1795 struct fb_videomode *m, mode;
1798 list_for_each_safe(pos, n, &info->modelist) {
1799 modelist = list_entry(pos, struct fb_modelist, list);
1800 m = &modelist->mode;
1801 fb_videomode_to_var(&var, m);
1802 var.activate = FB_ACTIVATE_TEST;
1803 err = fb_set_var(info, &var);
1804 fb_var_to_videomode(&mode, &var);
1805 if (err || !fb_mode_is_equal(m, &mode)) {
1811 if (list_empty(&info->modelist))
1814 fbcon_new_modelist(info);
1819 #if defined(CONFIG_VIDEO_NOMODESET)
1820 bool fb_modesetting_disabled(const char *drvname)
1822 bool fwonly = video_firmware_drivers_only();
1825 pr_warn("Driver %s not loading because of nomodeset parameter\n",
1830 EXPORT_SYMBOL(fb_modesetting_disabled);
1833 MODULE_LICENSE("GPL");