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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / video / fbmem.c
1 /*
2 * linux/drivers/video/fbmem.c
3 *
4 * Copyright (C) 1994 Martin Schaller
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
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
11 * for more details.
12 */
13
14 #include <linux/module.h>
15 #include <linux/dma-buf.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>
22 #include <linux/mm.h>
23 #include <linux/mman.h>
24 #include <linux/vt.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>
34 #include <linux/fb.h>
35
36 #include <asm/fb.h>
37
38
39 /*
40 * Frame buffer device initialization and setup routines
41 */
42
43 #define FBPIXMAPSIZE (1024 * 8)
44
45 static DEFINE_MUTEX(registration_lock);
46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
47 int num_registered_fb __read_mostly;
48
49 static struct fb_info *get_fb_info(unsigned int idx)
50 {
51 struct fb_info *fb_info;
52
53 if (idx >= FB_MAX)
54 return ERR_PTR(-ENODEV);
55
56 mutex_lock(&registration_lock);
57 fb_info = registered_fb[idx];
58 if (fb_info)
59 atomic_inc(&fb_info->count);
60 mutex_unlock(&registration_lock);
61
62 return fb_info;
63 }
64
65 static void put_fb_info(struct fb_info *fb_info)
66 {
67 if (!atomic_dec_and_test(&fb_info->count))
68 return;
69 if (fb_info->fbops->fb_destroy)
70 fb_info->fbops->fb_destroy(fb_info);
71 }
72
73 int lock_fb_info(struct fb_info *info)
74 {
75 mutex_lock(&info->lock);
76 if (!info->fbops) {
77 mutex_unlock(&info->lock);
78 return 0;
79 }
80 return 1;
81 }
82 EXPORT_SYMBOL(lock_fb_info);
83
84 /*
85 * Helpers
86 */
87
88 int fb_get_color_depth(struct fb_var_screeninfo *var,
89 struct fb_fix_screeninfo *fix)
90 {
91 int depth = 0;
92
93 if (fix->visual == FB_VISUAL_MONO01 ||
94 fix->visual == FB_VISUAL_MONO10)
95 depth = 1;
96 else {
97 if (var->green.length == var->blue.length &&
98 var->green.length == var->red.length &&
99 var->green.offset == var->blue.offset &&
100 var->green.offset == var->red.offset)
101 depth = var->green.length;
102 else
103 depth = var->green.length + var->red.length +
104 var->blue.length;
105 }
106
107 return depth;
108 }
109 EXPORT_SYMBOL(fb_get_color_depth);
110
111 /*
112 * Data padding functions.
113 */
114 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
115 {
116 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
117 }
118 EXPORT_SYMBOL(fb_pad_aligned_buffer);
119
120 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
121 u32 shift_high, u32 shift_low, u32 mod)
122 {
123 u8 mask = (u8) (0xfff << shift_high), tmp;
124 int i, j;
125
126 for (i = height; i--; ) {
127 for (j = 0; j < idx; j++) {
128 tmp = dst[j];
129 tmp &= mask;
130 tmp |= *src >> shift_low;
131 dst[j] = tmp;
132 tmp = *src << shift_high;
133 dst[j+1] = tmp;
134 src++;
135 }
136 tmp = dst[idx];
137 tmp &= mask;
138 tmp |= *src >> shift_low;
139 dst[idx] = tmp;
140 if (shift_high < mod) {
141 tmp = *src << shift_high;
142 dst[idx+1] = tmp;
143 }
144 src++;
145 dst += d_pitch;
146 }
147 }
148 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
149
150 /*
151 * we need to lock this section since fb_cursor
152 * may use fb_imageblit()
153 */
154 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
155 {
156 u32 align = buf->buf_align - 1, offset;
157 char *addr = buf->addr;
158
159 /* If IO mapped, we need to sync before access, no sharing of
160 * the pixmap is done
161 */
162 if (buf->flags & FB_PIXMAP_IO) {
163 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
164 info->fbops->fb_sync(info);
165 return addr;
166 }
167
168 /* See if we fit in the remaining pixmap space */
169 offset = buf->offset + align;
170 offset &= ~align;
171 if (offset + size > buf->size) {
172 /* We do not fit. In order to be able to re-use the buffer,
173 * we must ensure no asynchronous DMA'ing or whatever operation
174 * is in progress, we sync for that.
175 */
176 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
177 info->fbops->fb_sync(info);
178 offset = 0;
179 }
180 buf->offset = offset + size;
181 addr += offset;
182
183 return addr;
184 }
185
186 #ifdef CONFIG_LOGO
187
188 static inline unsigned safe_shift(unsigned d, int n)
189 {
190 return n < 0 ? d >> -n : d << n;
191 }
192
193 static void fb_set_logocmap(struct fb_info *info,
194 const struct linux_logo *logo)
195 {
196 struct fb_cmap palette_cmap;
197 u16 palette_green[16];
198 u16 palette_blue[16];
199 u16 palette_red[16];
200 int i, j, n;
201 const unsigned char *clut = logo->clut;
202
203 palette_cmap.start = 0;
204 palette_cmap.len = 16;
205 palette_cmap.red = palette_red;
206 palette_cmap.green = palette_green;
207 palette_cmap.blue = palette_blue;
208 palette_cmap.transp = NULL;
209
210 for (i = 0; i < logo->clutsize; i += n) {
211 n = logo->clutsize - i;
212 /* palette_cmap provides space for only 16 colors at once */
213 if (n > 16)
214 n = 16;
215 palette_cmap.start = 32 + i;
216 palette_cmap.len = n;
217 for (j = 0; j < n; ++j) {
218 palette_cmap.red[j] = clut[0] << 8 | clut[0];
219 palette_cmap.green[j] = clut[1] << 8 | clut[1];
220 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
221 clut += 3;
222 }
223 fb_set_cmap(&palette_cmap, info);
224 }
225 }
226
227 static void fb_set_logo_truepalette(struct fb_info *info,
228 const struct linux_logo *logo,
229 u32 *palette)
230 {
231 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
232 unsigned char redmask, greenmask, bluemask;
233 int redshift, greenshift, blueshift;
234 int i;
235 const unsigned char *clut = logo->clut;
236
237 /*
238 * We have to create a temporary palette since console palette is only
239 * 16 colors long.
240 */
241 /* Bug: Doesn't obey msb_right ... (who needs that?) */
242 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
243 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
244 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
245 redshift = info->var.red.offset - (8 - info->var.red.length);
246 greenshift = info->var.green.offset - (8 - info->var.green.length);
247 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
248
249 for ( i = 0; i < logo->clutsize; i++) {
250 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
251 safe_shift((clut[1] & greenmask), greenshift) |
252 safe_shift((clut[2] & bluemask), blueshift));
253 clut += 3;
254 }
255 }
256
257 static void fb_set_logo_directpalette(struct fb_info *info,
258 const struct linux_logo *logo,
259 u32 *palette)
260 {
261 int redshift, greenshift, blueshift;
262 int i;
263
264 redshift = info->var.red.offset;
265 greenshift = info->var.green.offset;
266 blueshift = info->var.blue.offset;
267
268 for (i = 32; i < 32 + logo->clutsize; i++)
269 palette[i] = i << redshift | i << greenshift | i << blueshift;
270 }
271
272 static void fb_set_logo(struct fb_info *info,
273 const struct linux_logo *logo, u8 *dst,
274 int depth)
275 {
276 int i, j, k;
277 const u8 *src = logo->data;
278 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
279 u8 fg = 1, d;
280
281 switch (fb_get_color_depth(&info->var, &info->fix)) {
282 case 1:
283 fg = 1;
284 break;
285 case 2:
286 fg = 3;
287 break;
288 default:
289 fg = 7;
290 break;
291 }
292
293 if (info->fix.visual == FB_VISUAL_MONO01 ||
294 info->fix.visual == FB_VISUAL_MONO10)
295 fg = ~((u8) (0xfff << info->var.green.length));
296
297 switch (depth) {
298 case 4:
299 for (i = 0; i < logo->height; i++)
300 for (j = 0; j < logo->width; src++) {
301 *dst++ = *src >> 4;
302 j++;
303 if (j < logo->width) {
304 *dst++ = *src & 0x0f;
305 j++;
306 }
307 }
308 break;
309 case 1:
310 for (i = 0; i < logo->height; i++) {
311 for (j = 0; j < logo->width; src++) {
312 d = *src ^ xor;
313 for (k = 7; k >= 0; k--) {
314 *dst++ = ((d >> k) & 1) ? fg : 0;
315 j++;
316 }
317 }
318 }
319 break;
320 }
321 }
322
323 /*
324 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
325 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
326 * the visual format and color depth of the framebuffer, the DAC, the
327 * pseudo_palette, and the logo data will be adjusted accordingly.
328 *
329 * Case 1 - linux_logo_clut224:
330 * Color exceeds the number of console colors (16), thus we set the hardware DAC
331 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
332 *
333 * For visuals that require color info from the pseudo_palette, we also construct
334 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
335 * will be set.
336 *
337 * Case 2 - linux_logo_vga16:
338 * The number of colors just matches the console colors, thus there is no need
339 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
340 * each byte contains color information for two pixels (upper and lower nibble).
341 * To be consistent with fb_imageblit() usage, we therefore separate the two
342 * nibbles into separate bytes. The "depth" flag will be set to 4.
343 *
344 * Case 3 - linux_logo_mono:
345 * This is similar with Case 2. Each byte contains information for 8 pixels.
346 * We isolate each bit and expand each into a byte. The "depth" flag will
347 * be set to 1.
348 */
349 static struct logo_data {
350 int depth;
351 int needs_directpalette;
352 int needs_truepalette;
353 int needs_cmapreset;
354 const struct linux_logo *logo;
355 } fb_logo __read_mostly;
356
357 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
358 {
359 u32 size = width * height, i;
360
361 out += size - 1;
362
363 for (i = size; i--; )
364 *out-- = *in++;
365 }
366
367 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
368 {
369 int i, j, h = height - 1;
370
371 for (i = 0; i < height; i++)
372 for (j = 0; j < width; j++)
373 out[height * j + h - i] = *in++;
374 }
375
376 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
377 {
378 int i, j, w = width - 1;
379
380 for (i = 0; i < height; i++)
381 for (j = 0; j < width; j++)
382 out[height * (w - j) + i] = *in++;
383 }
384
385 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
386 struct fb_image *image, int rotate)
387 {
388 u32 tmp;
389
390 if (rotate == FB_ROTATE_UD) {
391 fb_rotate_logo_ud(image->data, dst, image->width,
392 image->height);
393 image->dx = info->var.xres - image->width - image->dx;
394 image->dy = info->var.yres - image->height - image->dy;
395 } else if (rotate == FB_ROTATE_CW) {
396 fb_rotate_logo_cw(image->data, dst, image->width,
397 image->height);
398 tmp = image->width;
399 image->width = image->height;
400 image->height = tmp;
401 tmp = image->dy;
402 image->dy = image->dx;
403 image->dx = info->var.xres - image->width - tmp;
404 } else if (rotate == FB_ROTATE_CCW) {
405 fb_rotate_logo_ccw(image->data, dst, image->width,
406 image->height);
407 tmp = image->width;
408 image->width = image->height;
409 image->height = tmp;
410 tmp = image->dx;
411 image->dx = image->dy;
412 image->dy = info->var.yres - image->height - tmp;
413 }
414
415 image->data = dst;
416 }
417
418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
419 int rotate, unsigned int num)
420 {
421 unsigned int x;
422
423 if (rotate == FB_ROTATE_UR) {
424 for (x = 0;
425 x < num && image->dx + image->width <= info->var.xres;
426 x++) {
427 info->fbops->fb_imageblit(info, image);
428 image->dx += image->width + 8;
429 }
430 } else if (rotate == FB_ROTATE_UD) {
431 for (x = 0; x < num && image->dx >= 0; x++) {
432 info->fbops->fb_imageblit(info, image);
433 image->dx -= image->width + 8;
434 }
435 } else if (rotate == FB_ROTATE_CW) {
436 for (x = 0;
437 x < num && image->dy + image->height <= info->var.yres;
438 x++) {
439 info->fbops->fb_imageblit(info, image);
440 image->dy += image->height + 8;
441 }
442 } else if (rotate == FB_ROTATE_CCW) {
443 for (x = 0; x < num && image->dy >= 0; x++) {
444 info->fbops->fb_imageblit(info, image);
445 image->dy -= image->height + 8;
446 }
447 }
448 }
449
450 static int fb_show_logo_line(struct fb_info *info, int rotate,
451 const struct linux_logo *logo, int y,
452 unsigned int n)
453 {
454 u32 *palette = NULL, *saved_pseudo_palette = NULL;
455 unsigned char *logo_new = NULL, *logo_rotate = NULL;
456 struct fb_image image;
457
458 /* Return if the frame buffer is not mapped or suspended */
459 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
460 info->flags & FBINFO_MODULE)
461 return 0;
462
463 image.depth = 8;
464 image.data = logo->data;
465
466 if (fb_logo.needs_cmapreset)
467 fb_set_logocmap(info, logo);
468
469 if (fb_logo.needs_truepalette ||
470 fb_logo.needs_directpalette) {
471 palette = kmalloc(256 * 4, GFP_KERNEL);
472 if (palette == NULL)
473 return 0;
474
475 if (fb_logo.needs_truepalette)
476 fb_set_logo_truepalette(info, logo, palette);
477 else
478 fb_set_logo_directpalette(info, logo, palette);
479
480 saved_pseudo_palette = info->pseudo_palette;
481 info->pseudo_palette = palette;
482 }
483
484 if (fb_logo.depth <= 4) {
485 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
486 if (logo_new == NULL) {
487 kfree(palette);
488 if (saved_pseudo_palette)
489 info->pseudo_palette = saved_pseudo_palette;
490 return 0;
491 }
492 image.data = logo_new;
493 fb_set_logo(info, logo, logo_new, fb_logo.depth);
494 }
495
496 image.dx = 0;
497 image.dy = y;
498 image.width = logo->width;
499 image.height = logo->height;
500
501 if (rotate) {
502 logo_rotate = kmalloc(logo->width *
503 logo->height, GFP_KERNEL);
504 if (logo_rotate)
505 fb_rotate_logo(info, logo_rotate, &image, rotate);
506 }
507
508 fb_do_show_logo(info, &image, rotate, n);
509
510 kfree(palette);
511 if (saved_pseudo_palette != NULL)
512 info->pseudo_palette = saved_pseudo_palette;
513 kfree(logo_new);
514 kfree(logo_rotate);
515 return logo->height;
516 }
517
518
519 #ifdef CONFIG_FB_LOGO_EXTRA
520
521 #define FB_LOGO_EX_NUM_MAX 10
522 static struct logo_data_extra {
523 const struct linux_logo *logo;
524 unsigned int n;
525 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
526 static unsigned int fb_logo_ex_num;
527
528 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
529 {
530 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
531 return;
532
533 fb_logo_ex[fb_logo_ex_num].logo = logo;
534 fb_logo_ex[fb_logo_ex_num].n = n;
535 fb_logo_ex_num++;
536 }
537
538 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
539 unsigned int yres)
540 {
541 unsigned int i;
542
543 /* FIXME: logo_ex supports only truecolor fb. */
544 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
545 fb_logo_ex_num = 0;
546
547 for (i = 0; i < fb_logo_ex_num; i++) {
548 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
549 fb_logo_ex[i].logo = NULL;
550 continue;
551 }
552 height += fb_logo_ex[i].logo->height;
553 if (height > yres) {
554 height -= fb_logo_ex[i].logo->height;
555 fb_logo_ex_num = i;
556 break;
557 }
558 }
559 return height;
560 }
561
562 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
563 {
564 unsigned int i;
565
566 for (i = 0; i < fb_logo_ex_num; i++)
567 y += fb_show_logo_line(info, rotate,
568 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
569
570 return y;
571 }
572
573 #else /* !CONFIG_FB_LOGO_EXTRA */
574
575 static inline int fb_prepare_extra_logos(struct fb_info *info,
576 unsigned int height,
577 unsigned int yres)
578 {
579 return height;
580 }
581
582 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
583 {
584 return y;
585 }
586
587 #endif /* CONFIG_FB_LOGO_EXTRA */
588
589
590 int fb_prepare_logo(struct fb_info *info, int rotate)
591 {
592 int depth = fb_get_color_depth(&info->var, &info->fix);
593 unsigned int yres;
594
595 memset(&fb_logo, 0, sizeof(struct logo_data));
596
597 if (info->flags & FBINFO_MISC_TILEBLITTING ||
598 info->flags & FBINFO_MODULE)
599 return 0;
600
601 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
602 depth = info->var.blue.length;
603 if (info->var.red.length < depth)
604 depth = info->var.red.length;
605 if (info->var.green.length < depth)
606 depth = info->var.green.length;
607 }
608
609 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
610 /* assume console colormap */
611 depth = 4;
612 }
613
614 /* Return if no suitable logo was found */
615 fb_logo.logo = fb_find_logo(depth);
616
617 if (!fb_logo.logo) {
618 return 0;
619 }
620
621 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
622 yres = info->var.yres;
623 else
624 yres = info->var.xres;
625
626 if (fb_logo.logo->height > yres) {
627 fb_logo.logo = NULL;
628 return 0;
629 }
630
631 /* What depth we asked for might be different from what we get */
632 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
633 fb_logo.depth = 8;
634 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
635 fb_logo.depth = 4;
636 else
637 fb_logo.depth = 1;
638
639
640 if (fb_logo.depth > 4 && depth > 4) {
641 switch (info->fix.visual) {
642 case FB_VISUAL_TRUECOLOR:
643 fb_logo.needs_truepalette = 1;
644 break;
645 case FB_VISUAL_DIRECTCOLOR:
646 fb_logo.needs_directpalette = 1;
647 fb_logo.needs_cmapreset = 1;
648 break;
649 case FB_VISUAL_PSEUDOCOLOR:
650 fb_logo.needs_cmapreset = 1;
651 break;
652 }
653 }
654
655 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
656 }
657
658 int fb_show_logo(struct fb_info *info, int rotate)
659 {
660 int y;
661
662 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
663 num_online_cpus());
664 y = fb_show_extra_logos(info, y, rotate);
665
666 return y;
667 }
668 #else
669 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
670 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
671 #endif /* CONFIG_LOGO */
672
673 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
674 {
675 mutex_lock(&registration_lock);
676 return (*pos < FB_MAX) ? pos : NULL;
677 }
678
679 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
680 {
681 (*pos)++;
682 return (*pos < FB_MAX) ? pos : NULL;
683 }
684
685 static void fb_seq_stop(struct seq_file *m, void *v)
686 {
687 mutex_unlock(&registration_lock);
688 }
689
690 static int fb_seq_show(struct seq_file *m, void *v)
691 {
692 int i = *(loff_t *)v;
693 struct fb_info *fi = registered_fb[i];
694
695 if (fi)
696 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
697 return 0;
698 }
699
700 static const struct seq_operations proc_fb_seq_ops = {
701 .start = fb_seq_start,
702 .next = fb_seq_next,
703 .stop = fb_seq_stop,
704 .show = fb_seq_show,
705 };
706
707 static int proc_fb_open(struct inode *inode, struct file *file)
708 {
709 return seq_open(file, &proc_fb_seq_ops);
710 }
711
712 static const struct file_operations fb_proc_fops = {
713 .owner = THIS_MODULE,
714 .open = proc_fb_open,
715 .read = seq_read,
716 .llseek = seq_lseek,
717 .release = seq_release,
718 };
719
720 /*
721 * We hold a reference to the fb_info in file->private_data,
722 * but if the current registered fb has changed, we don't
723 * actually want to use it.
724 *
725 * So look up the fb_info using the inode minor number,
726 * and just verify it against the reference we have.
727 */
728 static struct fb_info *file_fb_info(struct file *file)
729 {
730 struct inode *inode = file_inode(file);
731 int fbidx = iminor(inode);
732 struct fb_info *info = registered_fb[fbidx];
733
734 if (info != file->private_data)
735 info = NULL;
736 return info;
737 }
738
739 static ssize_t
740 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
741 {
742 unsigned long p = *ppos;
743 struct fb_info *info = file_fb_info(file);
744 u8 *buffer, *dst;
745 u8 __iomem *src;
746 int c, cnt = 0, err = 0;
747 unsigned long total_size;
748
749 if (!info || ! info->screen_base)
750 return -ENODEV;
751
752 if (info->state != FBINFO_STATE_RUNNING)
753 return -EPERM;
754
755 if (info->fbops->fb_read)
756 return info->fbops->fb_read(info, buf, count, ppos);
757
758 total_size = info->screen_size;
759
760 if (total_size == 0)
761 total_size = info->fix.smem_len;
762
763 if (p >= total_size)
764 return 0;
765
766 if (count >= total_size)
767 count = total_size;
768
769 if (count + p > total_size)
770 count = total_size - p;
771
772 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
773 GFP_KERNEL);
774 if (!buffer)
775 return -ENOMEM;
776
777 src = (u8 __iomem *) (info->screen_base + p);
778
779 if (info->fbops->fb_sync)
780 info->fbops->fb_sync(info);
781
782 while (count) {
783 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
784 dst = buffer;
785 fb_memcpy_fromfb(dst, src, c);
786 dst += c;
787 src += c;
788
789 if (copy_to_user(buf, buffer, c)) {
790 err = -EFAULT;
791 break;
792 }
793 *ppos += c;
794 buf += c;
795 cnt += c;
796 count -= c;
797 }
798
799 kfree(buffer);
800
801 return (err) ? err : cnt;
802 }
803
804 static ssize_t
805 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
806 {
807 unsigned long p = *ppos;
808 struct fb_info *info = file_fb_info(file);
809 u8 *buffer, *src;
810 u8 __iomem *dst;
811 int c, cnt = 0, err = 0;
812 unsigned long total_size;
813
814 if (!info || !info->screen_base)
815 return -ENODEV;
816
817 if (info->state != FBINFO_STATE_RUNNING)
818 return -EPERM;
819
820 if (info->fbops->fb_write)
821 return info->fbops->fb_write(info, buf, count, ppos);
822
823 total_size = info->screen_size;
824
825 if (total_size == 0)
826 total_size = info->fix.smem_len;
827
828 if (p > total_size)
829 return -EFBIG;
830
831 if (count > total_size) {
832 err = -EFBIG;
833 count = total_size;
834 }
835
836 if (count + p > total_size) {
837 if (!err)
838 err = -ENOSPC;
839
840 count = total_size - p;
841 }
842
843 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
844 GFP_KERNEL);
845 if (!buffer)
846 return -ENOMEM;
847
848 dst = (u8 __iomem *) (info->screen_base + p);
849
850 if (info->fbops->fb_sync)
851 info->fbops->fb_sync(info);
852
853 while (count) {
854 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
855 src = buffer;
856
857 if (copy_from_user(src, buf, c)) {
858 err = -EFAULT;
859 break;
860 }
861
862 fb_memcpy_tofb(dst, src, c);
863 dst += c;
864 src += c;
865 *ppos += c;
866 buf += c;
867 cnt += c;
868 count -= c;
869 }
870
871 kfree(buffer);
872
873 return (cnt) ? cnt : err;
874 }
875
876 #ifdef CONFIG_DMA_SHARED_BUFFER
877 int
878 fb_get_dmabuf(struct fb_info *info, int flags)
879 {
880 struct dma_buf *dmabuf;
881
882 if (info->fbops->fb_dmabuf_export == NULL)
883 return -ENOTTY;
884
885 dmabuf = info->fbops->fb_dmabuf_export(info);
886 if (IS_ERR(dmabuf))
887 return PTR_ERR(dmabuf);
888
889 return dma_buf_fd(dmabuf, flags);
890 }
891 #endif
892
893 int
894 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
895 {
896 struct fb_fix_screeninfo *fix = &info->fix;
897 unsigned int yres = info->var.yres;
898 int err = 0;
899
900 if (var->yoffset > 0) {
901 if (var->vmode & FB_VMODE_YWRAP) {
902 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
903 err = -EINVAL;
904 else
905 yres = 0;
906 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
907 err = -EINVAL;
908 }
909
910 if (var->xoffset > 0 && (!fix->xpanstep ||
911 (var->xoffset % fix->xpanstep)))
912 err = -EINVAL;
913
914 if (err || !info->fbops->fb_pan_display ||
915 var->yoffset > info->var.yres_virtual - yres ||
916 var->xoffset > info->var.xres_virtual - info->var.xres)
917 return -EINVAL;
918
919 if ((err = info->fbops->fb_pan_display(var, info)))
920 return err;
921 info->var.xoffset = var->xoffset;
922 info->var.yoffset = var->yoffset;
923 if (var->vmode & FB_VMODE_YWRAP)
924 info->var.vmode |= FB_VMODE_YWRAP;
925 else
926 info->var.vmode &= ~FB_VMODE_YWRAP;
927 return 0;
928 }
929
930 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
931 u32 activate)
932 {
933 struct fb_event event;
934 struct fb_blit_caps caps, fbcaps;
935 int err = 0;
936
937 memset(&caps, 0, sizeof(caps));
938 memset(&fbcaps, 0, sizeof(fbcaps));
939 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
940 event.info = info;
941 event.data = &caps;
942 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
943 info->fbops->fb_get_caps(info, &fbcaps, var);
944
945 if (((fbcaps.x ^ caps.x) & caps.x) ||
946 ((fbcaps.y ^ caps.y) & caps.y) ||
947 (fbcaps.len < caps.len))
948 err = -EINVAL;
949
950 return err;
951 }
952
953 int
954 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
955 {
956 int flags = info->flags;
957 int ret = 0;
958
959 if (var->activate & FB_ACTIVATE_INV_MODE) {
960 struct fb_videomode mode1, mode2;
961
962 fb_var_to_videomode(&mode1, var);
963 fb_var_to_videomode(&mode2, &info->var);
964 /* make sure we don't delete the videomode of current var */
965 ret = fb_mode_is_equal(&mode1, &mode2);
966
967 if (!ret) {
968 struct fb_event event;
969
970 event.info = info;
971 event.data = &mode1;
972 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
973 }
974
975 if (!ret)
976 fb_delete_videomode(&mode1, &info->modelist);
977
978
979 ret = (ret) ? -EINVAL : 0;
980 goto done;
981 }
982
983 if ((var->activate & FB_ACTIVATE_FORCE) ||
984 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
985 u32 activate = var->activate;
986
987 /* When using FOURCC mode, make sure the red, green, blue and
988 * transp fields are set to 0.
989 */
990 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
991 var->grayscale > 1) {
992 if (var->red.offset || var->green.offset ||
993 var->blue.offset || var->transp.offset ||
994 var->red.length || var->green.length ||
995 var->blue.length || var->transp.length ||
996 var->red.msb_right || var->green.msb_right ||
997 var->blue.msb_right || var->transp.msb_right)
998 return -EINVAL;
999 }
1000
1001 if (!info->fbops->fb_check_var) {
1002 *var = info->var;
1003 goto done;
1004 }
1005
1006 ret = info->fbops->fb_check_var(var, info);
1007
1008 if (ret)
1009 goto done;
1010
1011 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1012 struct fb_var_screeninfo old_var;
1013 struct fb_videomode mode;
1014
1015 if (info->fbops->fb_get_caps) {
1016 ret = fb_check_caps(info, var, activate);
1017
1018 if (ret)
1019 goto done;
1020 }
1021
1022 old_var = info->var;
1023 info->var = *var;
1024
1025 if (info->fbops->fb_set_par) {
1026 ret = info->fbops->fb_set_par(info);
1027
1028 if (ret) {
1029 info->var = old_var;
1030 printk(KERN_WARNING "detected "
1031 "fb_set_par error, "
1032 "error code: %d\n", ret);
1033 goto done;
1034 }
1035 }
1036
1037 fb_pan_display(info, &info->var);
1038 fb_set_cmap(&info->cmap, info);
1039 fb_var_to_videomode(&mode, &info->var);
1040
1041 if (info->modelist.prev && info->modelist.next &&
1042 !list_empty(&info->modelist))
1043 ret = fb_add_videomode(&mode, &info->modelist);
1044
1045 if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1046 struct fb_event event;
1047 int evnt = (activate & FB_ACTIVATE_ALL) ?
1048 FB_EVENT_MODE_CHANGE_ALL :
1049 FB_EVENT_MODE_CHANGE;
1050
1051 info->flags &= ~FBINFO_MISC_USEREVENT;
1052 event.info = info;
1053 event.data = &mode;
1054 fb_notifier_call_chain(evnt, &event);
1055 }
1056 }
1057 }
1058
1059 done:
1060 return ret;
1061 }
1062
1063 int
1064 fb_blank(struct fb_info *info, int blank)
1065 {
1066 struct fb_event event;
1067 int ret = -EINVAL, early_ret;
1068
1069 if (blank > FB_BLANK_POWERDOWN)
1070 blank = FB_BLANK_POWERDOWN;
1071
1072 event.info = info;
1073 event.data = &blank;
1074
1075 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1076
1077 if (info->fbops->fb_blank)
1078 ret = info->fbops->fb_blank(blank, info);
1079
1080 if (!ret)
1081 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1082 else {
1083 /*
1084 * if fb_blank is failed then revert effects of
1085 * the early blank event.
1086 */
1087 if (!early_ret)
1088 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1089 }
1090
1091 return ret;
1092 }
1093
1094 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1095 unsigned long arg)
1096 {
1097 struct fb_ops *fb;
1098 struct fb_var_screeninfo var;
1099 struct fb_fix_screeninfo fix;
1100 struct fb_con2fbmap con2fb;
1101 struct fb_cmap cmap_from;
1102 struct fb_cmap_user cmap;
1103 #ifdef CONFIG_DMA_SHARED_BUFFER
1104 struct fb_dmabuf_export dmaexp;
1105 #endif
1106 struct fb_event event;
1107 void __user *argp = (void __user *)arg;
1108 long ret = 0;
1109
1110 switch (cmd) {
1111 case FBIOGET_VSCREENINFO:
1112 if (!lock_fb_info(info))
1113 return -ENODEV;
1114 var = info->var;
1115 unlock_fb_info(info);
1116
1117 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1118 break;
1119 case FBIOPUT_VSCREENINFO:
1120 if (copy_from_user(&var, argp, sizeof(var)))
1121 return -EFAULT;
1122 if (!lock_fb_info(info))
1123 return -ENODEV;
1124 console_lock();
1125 info->flags |= FBINFO_MISC_USEREVENT;
1126 ret = fb_set_var(info, &var);
1127 info->flags &= ~FBINFO_MISC_USEREVENT;
1128 console_unlock();
1129 unlock_fb_info(info);
1130 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1131 ret = -EFAULT;
1132 break;
1133 case FBIOGET_FSCREENINFO:
1134 if (!lock_fb_info(info))
1135 return -ENODEV;
1136 fix = info->fix;
1137 unlock_fb_info(info);
1138
1139 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1140 break;
1141 case FBIOPUTCMAP:
1142 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1143 return -EFAULT;
1144 ret = fb_set_user_cmap(&cmap, info);
1145 break;
1146 case FBIOGETCMAP:
1147 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1148 return -EFAULT;
1149 if (!lock_fb_info(info))
1150 return -ENODEV;
1151 cmap_from = info->cmap;
1152 unlock_fb_info(info);
1153 ret = fb_cmap_to_user(&cmap_from, &cmap);
1154 break;
1155 #ifdef CONFIG_DMA_SHARED_BUFFER
1156 case FBIOGET_DMABUF:
1157 if (copy_from_user(&dmaexp, argp, sizeof(dmaexp)))
1158 return -EFAULT;
1159
1160 if (!lock_fb_info(info))
1161 return -ENODEV;
1162 dmaexp.fd = fb_get_dmabuf(info, dmaexp.flags);
1163 unlock_fb_info(info);
1164
1165 if (dmaexp.fd < 0)
1166 return dmaexp.fd;
1167
1168 ret = copy_to_user(argp, &dmaexp, sizeof(dmaexp))
1169 ? -EFAULT : 0;
1170 break;
1171 #endif
1172 case FBIOPAN_DISPLAY:
1173 if (copy_from_user(&var, argp, sizeof(var)))
1174 return -EFAULT;
1175 if (!lock_fb_info(info))
1176 return -ENODEV;
1177 console_lock();
1178 ret = fb_pan_display(info, &var);
1179 console_unlock();
1180 unlock_fb_info(info);
1181 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1182 return -EFAULT;
1183 break;
1184 case FBIO_CURSOR:
1185 ret = -EINVAL;
1186 break;
1187 case FBIOGET_CON2FBMAP:
1188 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1189 return -EFAULT;
1190 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1191 return -EINVAL;
1192 con2fb.framebuffer = -1;
1193 event.data = &con2fb;
1194 if (!lock_fb_info(info))
1195 return -ENODEV;
1196 event.info = info;
1197 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1198 unlock_fb_info(info);
1199 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1200 break;
1201 case FBIOPUT_CON2FBMAP:
1202 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1203 return -EFAULT;
1204 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1205 return -EINVAL;
1206 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1207 return -EINVAL;
1208 if (!registered_fb[con2fb.framebuffer])
1209 request_module("fb%d", con2fb.framebuffer);
1210 if (!registered_fb[con2fb.framebuffer]) {
1211 ret = -EINVAL;
1212 break;
1213 }
1214 event.data = &con2fb;
1215 if (!lock_fb_info(info))
1216 return -ENODEV;
1217 console_lock();
1218 event.info = info;
1219 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1220 console_unlock();
1221 unlock_fb_info(info);
1222 break;
1223 case FBIOBLANK:
1224 if (!lock_fb_info(info))
1225 return -ENODEV;
1226 console_lock();
1227 info->flags |= FBINFO_MISC_USEREVENT;
1228 ret = fb_blank(info, arg);
1229 info->flags &= ~FBINFO_MISC_USEREVENT;
1230 console_unlock();
1231 unlock_fb_info(info);
1232 break;
1233 default:
1234 if (!lock_fb_info(info))
1235 return -ENODEV;
1236 fb = info->fbops;
1237 if (fb->fb_ioctl)
1238 ret = fb->fb_ioctl(info, cmd, arg);
1239 else
1240 ret = -ENOTTY;
1241 unlock_fb_info(info);
1242 }
1243 return ret;
1244 }
1245
1246 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1247 {
1248 struct fb_info *info = file_fb_info(file);
1249
1250 if (!info)
1251 return -ENODEV;
1252 return do_fb_ioctl(info, cmd, arg);
1253 }
1254
1255 #ifdef CONFIG_COMPAT
1256 struct fb_fix_screeninfo32 {
1257 char id[16];
1258 compat_caddr_t smem_start;
1259 u32 smem_len;
1260 u32 type;
1261 u32 type_aux;
1262 u32 visual;
1263 u16 xpanstep;
1264 u16 ypanstep;
1265 u16 ywrapstep;
1266 u32 line_length;
1267 compat_caddr_t mmio_start;
1268 u32 mmio_len;
1269 u32 accel;
1270 u16 reserved[3];
1271 };
1272
1273 struct fb_cmap32 {
1274 u32 start;
1275 u32 len;
1276 compat_caddr_t red;
1277 compat_caddr_t green;
1278 compat_caddr_t blue;
1279 compat_caddr_t transp;
1280 };
1281
1282 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1283 unsigned long arg)
1284 {
1285 struct fb_cmap_user __user *cmap;
1286 struct fb_cmap32 __user *cmap32;
1287 __u32 data;
1288 int err;
1289
1290 cmap = compat_alloc_user_space(sizeof(*cmap));
1291 cmap32 = compat_ptr(arg);
1292
1293 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1294 return -EFAULT;
1295
1296 if (get_user(data, &cmap32->red) ||
1297 put_user(compat_ptr(data), &cmap->red) ||
1298 get_user(data, &cmap32->green) ||
1299 put_user(compat_ptr(data), &cmap->green) ||
1300 get_user(data, &cmap32->blue) ||
1301 put_user(compat_ptr(data), &cmap->blue) ||
1302 get_user(data, &cmap32->transp) ||
1303 put_user(compat_ptr(data), &cmap->transp))
1304 return -EFAULT;
1305
1306 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1307
1308 if (!err) {
1309 if (copy_in_user(&cmap32->start,
1310 &cmap->start,
1311 2 * sizeof(__u32)))
1312 err = -EFAULT;
1313 }
1314 return err;
1315 }
1316
1317 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1318 struct fb_fix_screeninfo32 __user *fix32)
1319 {
1320 __u32 data;
1321 int err;
1322
1323 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1324
1325 data = (__u32) (unsigned long) fix->smem_start;
1326 err |= put_user(data, &fix32->smem_start);
1327
1328 err |= put_user(fix->smem_len, &fix32->smem_len);
1329 err |= put_user(fix->type, &fix32->type);
1330 err |= put_user(fix->type_aux, &fix32->type_aux);
1331 err |= put_user(fix->visual, &fix32->visual);
1332 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1333 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1334 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1335 err |= put_user(fix->line_length, &fix32->line_length);
1336
1337 data = (__u32) (unsigned long) fix->mmio_start;
1338 err |= put_user(data, &fix32->mmio_start);
1339
1340 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1341 err |= put_user(fix->accel, &fix32->accel);
1342 err |= copy_to_user(fix32->reserved, fix->reserved,
1343 sizeof(fix->reserved));
1344
1345 return err;
1346 }
1347
1348 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1349 unsigned long arg)
1350 {
1351 mm_segment_t old_fs;
1352 struct fb_fix_screeninfo fix;
1353 struct fb_fix_screeninfo32 __user *fix32;
1354 int err;
1355
1356 fix32 = compat_ptr(arg);
1357
1358 old_fs = get_fs();
1359 set_fs(KERNEL_DS);
1360 err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1361 set_fs(old_fs);
1362
1363 if (!err)
1364 err = do_fscreeninfo_to_user(&fix, fix32);
1365
1366 return err;
1367 }
1368
1369 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1370 unsigned long arg)
1371 {
1372 struct fb_info *info = file_fb_info(file);
1373 struct fb_ops *fb;
1374 long ret = -ENOIOCTLCMD;
1375
1376 if (!info)
1377 return -ENODEV;
1378 fb = info->fbops;
1379 switch(cmd) {
1380 case FBIOGET_VSCREENINFO:
1381 case FBIOPUT_VSCREENINFO:
1382 case FBIOPAN_DISPLAY:
1383 case FBIOGET_CON2FBMAP:
1384 case FBIOPUT_CON2FBMAP:
1385 arg = (unsigned long) compat_ptr(arg);
1386 case FBIOBLANK:
1387 ret = do_fb_ioctl(info, cmd, arg);
1388 break;
1389
1390 case FBIOGET_FSCREENINFO:
1391 ret = fb_get_fscreeninfo(info, cmd, arg);
1392 break;
1393
1394 case FBIOGETCMAP:
1395 case FBIOPUTCMAP:
1396 ret = fb_getput_cmap(info, cmd, arg);
1397 break;
1398
1399 default:
1400 if (fb->fb_compat_ioctl)
1401 ret = fb->fb_compat_ioctl(info, cmd, arg);
1402 break;
1403 }
1404 return ret;
1405 }
1406 #endif
1407
1408 static int
1409 fb_mmap(struct file *file, struct vm_area_struct * vma)
1410 {
1411 struct fb_info *info = file_fb_info(file);
1412 struct fb_ops *fb;
1413 unsigned long mmio_pgoff;
1414 unsigned long start;
1415 u32 len;
1416
1417 if (!info)
1418 return -ENODEV;
1419 fb = info->fbops;
1420 if (!fb)
1421 return -ENODEV;
1422 mutex_lock(&info->mm_lock);
1423 if (fb->fb_mmap) {
1424 int res;
1425 res = fb->fb_mmap(info, vma);
1426 mutex_unlock(&info->mm_lock);
1427 return res;
1428 }
1429
1430 /*
1431 * Ugh. This can be either the frame buffer mapping, or
1432 * if pgoff points past it, the mmio mapping.
1433 */
1434 start = info->fix.smem_start;
1435 len = info->fix.smem_len;
1436 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1437 if (vma->vm_pgoff >= mmio_pgoff) {
1438 if (info->var.accel_flags) {
1439 mutex_unlock(&info->mm_lock);
1440 return -EINVAL;
1441 }
1442
1443 vma->vm_pgoff -= mmio_pgoff;
1444 start = info->fix.mmio_start;
1445 len = info->fix.mmio_len;
1446 }
1447 mutex_unlock(&info->mm_lock);
1448
1449 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1450 fb_pgprotect(file, vma, start);
1451
1452 return vm_iomap_memory(vma, start, len);
1453 }
1454
1455 static int
1456 fb_open(struct inode *inode, struct file *file)
1457 __acquires(&info->lock)
1458 __releases(&info->lock)
1459 {
1460 int fbidx = iminor(inode);
1461 struct fb_info *info;
1462 int res = 0;
1463
1464 info = get_fb_info(fbidx);
1465 if (!info) {
1466 request_module("fb%d", fbidx);
1467 info = get_fb_info(fbidx);
1468 if (!info)
1469 return -ENODEV;
1470 }
1471 if (IS_ERR(info))
1472 return PTR_ERR(info);
1473
1474 mutex_lock(&info->lock);
1475 if (!try_module_get(info->fbops->owner)) {
1476 res = -ENODEV;
1477 goto out;
1478 }
1479 file->private_data = info;
1480 if (info->fbops->fb_open) {
1481 res = info->fbops->fb_open(info,1);
1482 if (res)
1483 module_put(info->fbops->owner);
1484 }
1485 #ifdef CONFIG_FB_DEFERRED_IO
1486 if (info->fbdefio)
1487 fb_deferred_io_open(info, inode, file);
1488 #endif
1489 out:
1490 mutex_unlock(&info->lock);
1491 if (res)
1492 put_fb_info(info);
1493 return res;
1494 }
1495
1496 static int
1497 fb_release(struct inode *inode, struct file *file)
1498 __acquires(&info->lock)
1499 __releases(&info->lock)
1500 {
1501 struct fb_info * const info = file->private_data;
1502
1503 mutex_lock(&info->lock);
1504 if (info->fbops->fb_release)
1505 info->fbops->fb_release(info,1);
1506 module_put(info->fbops->owner);
1507 mutex_unlock(&info->lock);
1508 put_fb_info(info);
1509 return 0;
1510 }
1511
1512 static const struct file_operations fb_fops = {
1513 .owner = THIS_MODULE,
1514 .read = fb_read,
1515 .write = fb_write,
1516 .unlocked_ioctl = fb_ioctl,
1517 #ifdef CONFIG_COMPAT
1518 .compat_ioctl = fb_compat_ioctl,
1519 #endif
1520 .mmap = fb_mmap,
1521 .open = fb_open,
1522 .release = fb_release,
1523 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1524 .get_unmapped_area = get_fb_unmapped_area,
1525 #endif
1526 #ifdef CONFIG_FB_DEFERRED_IO
1527 .fsync = fb_deferred_io_fsync,
1528 #endif
1529 .llseek = default_llseek,
1530 };
1531
1532 struct class *fb_class;
1533 EXPORT_SYMBOL(fb_class);
1534
1535 static int fb_check_foreignness(struct fb_info *fi)
1536 {
1537 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1538
1539 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1540
1541 #ifdef __BIG_ENDIAN
1542 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1543 #else
1544 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1545 #endif /* __BIG_ENDIAN */
1546
1547 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1548 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1549 "support this framebuffer\n", fi->fix.id);
1550 return -ENOSYS;
1551 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1552 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1553 "support this framebuffer\n", fi->fix.id);
1554 return -ENOSYS;
1555 }
1556
1557 return 0;
1558 }
1559
1560 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1561 {
1562 /* is the generic aperture base the same as the HW one */
1563 if (gen->base == hw->base)
1564 return true;
1565 /* is the generic aperture base inside the hw base->hw base+size */
1566 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1567 return true;
1568 return false;
1569 }
1570
1571 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1572 struct apertures_struct *hwa)
1573 {
1574 int i, j;
1575 if (!hwa || !gena)
1576 return false;
1577
1578 for (i = 0; i < hwa->count; ++i) {
1579 struct aperture *h = &hwa->ranges[i];
1580 for (j = 0; j < gena->count; ++j) {
1581 struct aperture *g = &gena->ranges[j];
1582 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1583 (unsigned long long)g->base,
1584 (unsigned long long)g->size,
1585 (unsigned long long)h->base,
1586 (unsigned long long)h->size);
1587 if (apertures_overlap(g, h))
1588 return true;
1589 }
1590 }
1591
1592 return false;
1593 }
1594
1595 static int do_unregister_framebuffer(struct fb_info *fb_info);
1596
1597 #define VGA_FB_PHYS 0xA0000
1598 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1599 const char *name, bool primary)
1600 {
1601 int i;
1602
1603 /* check all firmware fbs and kick off if the base addr overlaps */
1604 for (i = 0 ; i < FB_MAX; i++) {
1605 struct apertures_struct *gen_aper;
1606 if (!registered_fb[i])
1607 continue;
1608
1609 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1610 continue;
1611
1612 gen_aper = registered_fb[i]->apertures;
1613 if (fb_do_apertures_overlap(gen_aper, a) ||
1614 (primary && gen_aper && gen_aper->count &&
1615 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1616
1617 printk(KERN_INFO "fb: conflicting fb hw usage "
1618 "%s vs %s - removing generic driver\n",
1619 name, registered_fb[i]->fix.id);
1620 do_unregister_framebuffer(registered_fb[i]);
1621 }
1622 }
1623 }
1624
1625 static int do_register_framebuffer(struct fb_info *fb_info)
1626 {
1627 int i;
1628 struct fb_event event;
1629 struct fb_videomode mode;
1630
1631 if (fb_check_foreignness(fb_info))
1632 return -ENOSYS;
1633
1634 do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1635 fb_is_primary_device(fb_info));
1636
1637 if (num_registered_fb == FB_MAX)
1638 return -ENXIO;
1639
1640 num_registered_fb++;
1641 for (i = 0 ; i < FB_MAX; i++)
1642 if (!registered_fb[i])
1643 break;
1644 fb_info->node = i;
1645 atomic_set(&fb_info->count, 1);
1646 mutex_init(&fb_info->lock);
1647 mutex_init(&fb_info->mm_lock);
1648
1649 fb_info->dev = device_create(fb_class, fb_info->device,
1650 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1651 if (IS_ERR(fb_info->dev)) {
1652 /* Not fatal */
1653 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1654 fb_info->dev = NULL;
1655 } else
1656 fb_init_device(fb_info);
1657
1658 if (fb_info->pixmap.addr == NULL) {
1659 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1660 if (fb_info->pixmap.addr) {
1661 fb_info->pixmap.size = FBPIXMAPSIZE;
1662 fb_info->pixmap.buf_align = 1;
1663 fb_info->pixmap.scan_align = 1;
1664 fb_info->pixmap.access_align = 32;
1665 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1666 }
1667 }
1668 fb_info->pixmap.offset = 0;
1669
1670 if (!fb_info->pixmap.blit_x)
1671 fb_info->pixmap.blit_x = ~(u32)0;
1672
1673 if (!fb_info->pixmap.blit_y)
1674 fb_info->pixmap.blit_y = ~(u32)0;
1675
1676 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1677 INIT_LIST_HEAD(&fb_info->modelist);
1678
1679 if (fb_info->skip_vt_switch)
1680 pm_vt_switch_required(fb_info->dev, false);
1681 else
1682 pm_vt_switch_required(fb_info->dev, true);
1683
1684 fb_var_to_videomode(&mode, &fb_info->var);
1685 fb_add_videomode(&mode, &fb_info->modelist);
1686 registered_fb[i] = fb_info;
1687
1688 event.info = fb_info;
1689 if (!lock_fb_info(fb_info))
1690 return -ENODEV;
1691 console_lock();
1692 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1693 console_unlock();
1694 unlock_fb_info(fb_info);
1695 return 0;
1696 }
1697
1698 static int do_unregister_framebuffer(struct fb_info *fb_info)
1699 {
1700 struct fb_event event;
1701 int i, ret = 0;
1702
1703 i = fb_info->node;
1704 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1705 return -EINVAL;
1706
1707 if (!lock_fb_info(fb_info))
1708 return -ENODEV;
1709 console_lock();
1710 event.info = fb_info;
1711 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1712 console_unlock();
1713 unlock_fb_info(fb_info);
1714
1715 if (ret)
1716 return -EINVAL;
1717
1718 pm_vt_switch_unregister(fb_info->dev);
1719
1720 unlink_framebuffer(fb_info);
1721 if (fb_info->pixmap.addr &&
1722 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1723 kfree(fb_info->pixmap.addr);
1724 fb_destroy_modelist(&fb_info->modelist);
1725 registered_fb[i] = NULL;
1726 num_registered_fb--;
1727 fb_cleanup_device(fb_info);
1728 event.info = fb_info;
1729 console_lock();
1730 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1731 console_unlock();
1732
1733 /* this may free fb info */
1734 put_fb_info(fb_info);
1735 return 0;
1736 }
1737
1738 int unlink_framebuffer(struct fb_info *fb_info)
1739 {
1740 int i;
1741
1742 i = fb_info->node;
1743 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1744 return -EINVAL;
1745
1746 if (fb_info->dev) {
1747 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1748 fb_info->dev = NULL;
1749 }
1750 return 0;
1751 }
1752 EXPORT_SYMBOL(unlink_framebuffer);
1753
1754 void remove_conflicting_framebuffers(struct apertures_struct *a,
1755 const char *name, bool primary)
1756 {
1757 mutex_lock(&registration_lock);
1758 do_remove_conflicting_framebuffers(a, name, primary);
1759 mutex_unlock(&registration_lock);
1760 }
1761 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1762
1763 /**
1764 * register_framebuffer - registers a frame buffer device
1765 * @fb_info: frame buffer info structure
1766 *
1767 * Registers a frame buffer device @fb_info.
1768 *
1769 * Returns negative errno on error, or zero for success.
1770 *
1771 */
1772 int
1773 register_framebuffer(struct fb_info *fb_info)
1774 {
1775 int ret;
1776
1777 mutex_lock(&registration_lock);
1778 ret = do_register_framebuffer(fb_info);
1779 mutex_unlock(&registration_lock);
1780
1781 return ret;
1782 }
1783
1784 /**
1785 * unregister_framebuffer - releases a frame buffer device
1786 * @fb_info: frame buffer info structure
1787 *
1788 * Unregisters a frame buffer device @fb_info.
1789 *
1790 * Returns negative errno on error, or zero for success.
1791 *
1792 * This function will also notify the framebuffer console
1793 * to release the driver.
1794 *
1795 * This is meant to be called within a driver's module_exit()
1796 * function. If this is called outside module_exit(), ensure
1797 * that the driver implements fb_open() and fb_release() to
1798 * check that no processes are using the device.
1799 */
1800 int
1801 unregister_framebuffer(struct fb_info *fb_info)
1802 {
1803 int ret;
1804
1805 mutex_lock(&registration_lock);
1806 ret = do_unregister_framebuffer(fb_info);
1807 mutex_unlock(&registration_lock);
1808
1809 return ret;
1810 }
1811
1812 /**
1813 * fb_set_suspend - low level driver signals suspend
1814 * @info: framebuffer affected
1815 * @state: 0 = resuming, !=0 = suspending
1816 *
1817 * This is meant to be used by low level drivers to
1818 * signal suspend/resume to the core & clients.
1819 * It must be called with the console semaphore held
1820 */
1821 void fb_set_suspend(struct fb_info *info, int state)
1822 {
1823 struct fb_event event;
1824
1825 event.info = info;
1826 if (state) {
1827 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1828 info->state = FBINFO_STATE_SUSPENDED;
1829 } else {
1830 info->state = FBINFO_STATE_RUNNING;
1831 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1832 }
1833 }
1834
1835 /**
1836 * fbmem_init - init frame buffer subsystem
1837 *
1838 * Initialize the frame buffer subsystem.
1839 *
1840 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1841 *
1842 */
1843
1844 static int __init
1845 fbmem_init(void)
1846 {
1847 proc_create("fb", 0, NULL, &fb_proc_fops);
1848
1849 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1850 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1851
1852 fb_class = class_create(THIS_MODULE, "graphics");
1853 if (IS_ERR(fb_class)) {
1854 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1855 fb_class = NULL;
1856 }
1857 return 0;
1858 }
1859
1860 #ifdef MODULE
1861 module_init(fbmem_init);
1862 static void __exit
1863 fbmem_exit(void)
1864 {
1865 remove_proc_entry("fb", NULL);
1866 class_destroy(fb_class);
1867 unregister_chrdev(FB_MAJOR, "fb");
1868 }
1869
1870 module_exit(fbmem_exit);
1871 MODULE_LICENSE("GPL");
1872 MODULE_DESCRIPTION("Framebuffer base");
1873 #else
1874 subsys_initcall(fbmem_init);
1875 #endif
1876
1877 int fb_new_modelist(struct fb_info *info)
1878 {
1879 struct fb_event event;
1880 struct fb_var_screeninfo var = info->var;
1881 struct list_head *pos, *n;
1882 struct fb_modelist *modelist;
1883 struct fb_videomode *m, mode;
1884 int err = 1;
1885
1886 list_for_each_safe(pos, n, &info->modelist) {
1887 modelist = list_entry(pos, struct fb_modelist, list);
1888 m = &modelist->mode;
1889 fb_videomode_to_var(&var, m);
1890 var.activate = FB_ACTIVATE_TEST;
1891 err = fb_set_var(info, &var);
1892 fb_var_to_videomode(&mode, &var);
1893 if (err || !fb_mode_is_equal(m, &mode)) {
1894 list_del(pos);
1895 kfree(pos);
1896 }
1897 }
1898
1899 err = 1;
1900
1901 if (!list_empty(&info->modelist)) {
1902 event.info = info;
1903 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1904 }
1905
1906 return err;
1907 }
1908
1909 static char *video_options[FB_MAX] __read_mostly;
1910 static int ofonly __read_mostly;
1911
1912 /**
1913 * fb_get_options - get kernel boot parameters
1914 * @name: framebuffer name as it would appear in
1915 * the boot parameter line
1916 * (video=<name>:<options>)
1917 * @option: the option will be stored here
1918 *
1919 * NOTE: Needed to maintain backwards compatibility
1920 */
1921 int fb_get_options(char *name, char **option)
1922 {
1923 char *opt, *options = NULL;
1924 int retval = 0;
1925 int name_len = strlen(name), i;
1926
1927 if (name_len && ofonly && strncmp(name, "offb", 4))
1928 retval = 1;
1929
1930 if (name_len && !retval) {
1931 for (i = 0; i < FB_MAX; i++) {
1932 if (video_options[i] == NULL)
1933 continue;
1934 if (!video_options[i][0])
1935 continue;
1936 opt = video_options[i];
1937 if (!strncmp(name, opt, name_len) &&
1938 opt[name_len] == ':')
1939 options = opt + name_len + 1;
1940 }
1941 }
1942 if (options && !strncmp(options, "off", 3))
1943 retval = 1;
1944
1945 if (option)
1946 *option = options;
1947
1948 return retval;
1949 }
1950
1951 #ifndef MODULE
1952 /**
1953 * video_setup - process command line options
1954 * @options: string of options
1955 *
1956 * Process command line options for frame buffer subsystem.
1957 *
1958 * NOTE: This function is a __setup and __init function.
1959 * It only stores the options. Drivers have to call
1960 * fb_get_options() as necessary.
1961 *
1962 * Returns zero.
1963 *
1964 */
1965 static int __init video_setup(char *options)
1966 {
1967 int i, global = 0;
1968
1969 if (!options || !*options)
1970 global = 1;
1971
1972 if (!global && !strncmp(options, "ofonly", 6)) {
1973 ofonly = 1;
1974 global = 1;
1975 }
1976
1977 if (!global && !strchr(options, ':')) {
1978 fb_mode_option = options;
1979 global = 1;
1980 }
1981
1982 if (!global) {
1983 for (i = 0; i < FB_MAX; i++) {
1984 if (video_options[i] == NULL) {
1985 video_options[i] = options;
1986 break;
1987 }
1988
1989 }
1990 }
1991
1992 return 1;
1993 }
1994 __setup("video=", video_setup);
1995 #endif
1996
1997 /*
1998 * Visible symbols for modules
1999 */
2000
2001 EXPORT_SYMBOL(register_framebuffer);
2002 EXPORT_SYMBOL(unregister_framebuffer);
2003 EXPORT_SYMBOL(num_registered_fb);
2004 EXPORT_SYMBOL(registered_fb);
2005 EXPORT_SYMBOL(fb_show_logo);
2006 EXPORT_SYMBOL(fb_set_var);
2007 EXPORT_SYMBOL(fb_blank);
2008 EXPORT_SYMBOL(fb_pan_display);
2009 EXPORT_SYMBOL(fb_get_buffer_offset);
2010 EXPORT_SYMBOL(fb_set_suspend);
2011 EXPORT_SYMBOL(fb_get_options);
2012
2013 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)