aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/video/fbmem.c
blob: 4ff853fbe0bea8352bf6df8346af90d613b06031 (plain) (tree)
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630













































































                                                                             
                          
   
                                                                                  
 
                 

                                 


                                                                              



                               
                                     
 

                                                                                

























                                                  
                                       


























































































































































































































































































































































































































































































































                                                                                       
                                     




















































                                                                               
                                                                      























































































































































































































































































































                                                                                
                              
























                                                              
                                                                                 













                                                                                                                                          
                                                          



















































                                                                                
                                                           





























































                                                                                 
                                                         











                                                                                                   
                                
                                          













































                                                                     

                                      







































                                                             












                                                                
                                            











































                                                           






                                    
/*
 *  linux/drivers/video/fbmem.c
 *
 *  Copyright (C) 1994 Martin Schaller
 *
 *	2001 - Documented with DocBook
 *	- Brad Douglas <brad@neruo.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/config.h>
#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/tty.h>
#include <linux/init.h>
#include <linux/linux_logo.h>
#include <linux/proc_fs.h>
#include <linux/console.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
#include <linux/devfs_fs_kernel.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/efi.h>

#if defined(__mc68000__) || defined(CONFIG_APUS)
#include <asm/setup.h>
#endif

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#include <linux/fb.h>

    /*
     *  Frame buffer device initialization and setup routines
     */

#define FBPIXMAPSIZE	(1024 * 8)

static struct notifier_block *fb_notifier_list;
struct fb_info *registered_fb[FB_MAX];
int num_registered_fb;

/*
 * Helpers
 */

int fb_get_color_depth(struct fb_var_screeninfo *var)
{
	if (var->green.length == var->blue.length &&
	    var->green.length == var->red.length &&
	    !var->green.offset && !var->blue.offset &&
	    !var->red.offset)
		return var->green.length;
	else
		return (var->green.length + var->red.length +
			var->blue.length);
}
EXPORT_SYMBOL(fb_get_color_depth);

/*
 * Data padding functions.
 */
void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
{
	int i, j;

	for (i = height; i--; ) {
		/* s_pitch is a few bytes at the most, memcpy is suboptimal */
		for (j = 0; j < s_pitch; j++)
			dst[j] = src[j];
		src += s_pitch;
		dst += d_pitch;
	}
}
EXPORT_SYMBOL(fb_pad_aligned_buffer);

void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
				u32 shift_high, u32 shift_low, u32 mod)
{
	u8 mask = (u8) (0xfff << shift_high), tmp;
	int i, j;

	for (i = height; i--; ) {
		for (j = 0; j < idx; j++) {
			tmp = dst[j];
			tmp &= mask;
			tmp |= *src >> shift_low;
			dst[j] = tmp;
			tmp = *src << shift_high;
			dst[j+1] = tmp;
			src++;
		}
		tmp = dst[idx];
		tmp &= mask;
		tmp |= *src >> shift_low;
		dst[idx] = tmp;
		if (shift_high < mod) {
			tmp = *src << shift_high;
			dst[idx+1] = tmp;
		}
		src++;
		dst += d_pitch;
	}
}
EXPORT_SYMBOL(fb_pad_unaligned_buffer);

/*
 * we need to lock this section since fb_cursor
 * may use fb_imageblit()
 */
char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
{
	u32 align = buf->buf_align - 1, offset;
	char *addr = buf->addr;

	/* If IO mapped, we need to sync before access, no sharing of
	 * the pixmap is done
	 */
	if (buf->flags & FB_PIXMAP_IO) {
		if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
			info->fbops->fb_sync(info);
		return addr;
	}

	/* See if we fit in the remaining pixmap space */
	offset = buf->offset + align;
	offset &= ~align;
	if (offset + size > buf->size) {
		/* We do not fit. In order to be able to re-use the buffer,
		 * we must ensure no asynchronous DMA'ing or whatever operation
		 * is in progress, we sync for that.
		 */
		if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
			info->fbops->fb_sync(info);
		offset = 0;
	}
	buf->offset = offset + size;
	addr += offset;

	return addr;
}

#ifdef CONFIG_LOGO
#include <linux/linux_logo.h>

static inline unsigned safe_shift(unsigned d, int n)
{
	return n < 0 ? d >> -n : d << n;
}

static void fb_set_logocmap(struct fb_info *info,
				   const struct linux_logo *logo)
{
	struct fb_cmap palette_cmap;
	u16 palette_green[16];
	u16 palette_blue[16];
	u16 palette_red[16];
	int i, j, n;
	const unsigned char *clut = logo->clut;

	palette_cmap.start = 0;
	palette_cmap.len = 16;
	palette_cmap.red = palette_red;
	palette_cmap.green = palette_green;
	palette_cmap.blue = palette_blue;
	palette_cmap.transp = NULL;

	for (i = 0; i < logo->clutsize; i += n) {
		n = logo->clutsize - i;
		/* palette_cmap provides space for only 16 colors at once */
		if (n > 16)
			n = 16;
		palette_cmap.start = 32 + i;
		palette_cmap.len = n;
		for (j = 0; j < n; ++j) {
			palette_cmap.red[j] = clut[0] << 8 | clut[0];
			palette_cmap.green[j] = clut[1] << 8 | clut[1];
			palette_cmap.blue[j] = clut[2] << 8 | clut[2];
			clut += 3;
		}
		fb_set_cmap(&palette_cmap, info);
	}
}

static void  fb_set_logo_truepalette(struct fb_info *info,
					    const struct linux_logo *logo,
					    u32 *palette)
{
	unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
	unsigned char redmask, greenmask, bluemask;
	int redshift, greenshift, blueshift;
	int i;
	const unsigned char *clut = logo->clut;

	/*
	 * We have to create a temporary palette since console palette is only
	 * 16 colors long.
	 */
	/* Bug: Doesn't obey msb_right ... (who needs that?) */
	redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
	greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
	bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
	redshift   = info->var.red.offset   - (8 - info->var.red.length);
	greenshift = info->var.green.offset - (8 - info->var.green.length);
	blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);

	for ( i = 0; i < logo->clutsize; i++) {
		palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
				 safe_shift((clut[1] & greenmask), greenshift) |
				 safe_shift((clut[2] & bluemask), blueshift));
		clut += 3;
	}
}

static void fb_set_logo_directpalette(struct fb_info *info,
					     const struct linux_logo *logo,
					     u32 *palette)
{
	int redshift, greenshift, blueshift;
	int i;

	redshift = info->var.red.offset;
	greenshift = info->var.green.offset;
	blueshift = info->var.blue.offset;

	for (i = 32; i < logo->clutsize; i++)
		palette[i] = i << redshift | i << greenshift | i << blueshift;
}

static void fb_set_logo(struct fb_info *info,
			       const struct linux_logo *logo, u8 *dst,
			       int depth)
{
	int i, j, k, fg = 1;
	const u8 *src = logo->data;
	u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;

	if (fb_get_color_depth(&info->var) == 3)
		fg = 7;

	switch (depth) {
	case 4:
		for (i = 0; i < logo->height; i++)
			for (j = 0; j < logo->width; src++) {
				*dst++ = *src >> 4;
				j++;
				if (j < logo->width) {
					*dst++ = *src & 0x0f;
					j++;
				}
			}
		break;
	case 1:
		for (i = 0; i < logo->height; i++) {
			for (j = 0; j < logo->width; src++) {
				d = *src ^ xor;
				for (k = 7; k >= 0; k--) {
					*dst++ = ((d >> k) & 1) ? fg : 0;
					j++;
				}
			}
		}
		break;
	}
}

/*
 * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 * the visual format and color depth of the framebuffer, the DAC, the
 * pseudo_palette, and the logo data will be adjusted accordingly.
 *
 * Case 1 - linux_logo_clut224:
 * Color exceeds the number of console colors (16), thus we set the hardware DAC
 * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 *
 * For visuals that require color info from the pseudo_palette, we also construct
 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 * will be set.
 *
 * Case 2 - linux_logo_vga16:
 * The number of colors just matches the console colors, thus there is no need
 * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 * each byte contains color information for two pixels (upper and lower nibble).
 * To be consistent with fb_imageblit() usage, we therefore separate the two
 * nibbles into separate bytes. The "depth" flag will be set to 4.
 *
 * Case 3 - linux_logo_mono:
 * This is similar with Case 2.  Each byte contains information for 8 pixels.
 * We isolate each bit and expand each into a byte. The "depth" flag will
 * be set to 1.
 */
static struct logo_data {
	int depth;
	int needs_directpalette;
	int needs_truepalette;
	int needs_cmapreset;
	const struct linux_logo *logo;
} fb_logo;

int fb_prepare_logo(struct fb_info *info)
{
	int depth = fb_get_color_depth(&info->var);

	memset(&fb_logo, 0, sizeof(struct logo_data));

	if (info->flags & FBINFO_MISC_TILEBLITTING)
		return 0;

	if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
		depth = info->var.blue.length;
		if (info->var.red.length < depth)
			depth = info->var.red.length;
		if (info->var.green.length < depth)
			depth = info->var.green.length;
	}

	if (depth >= 8) {
		switch (info->fix.visual) {
		case FB_VISUAL_TRUECOLOR:
			fb_logo.needs_truepalette = 1;
			break;
		case FB_VISUAL_DIRECTCOLOR:
			fb_logo.needs_directpalette = 1;
			fb_logo.needs_cmapreset = 1;
			break;
		case FB_VISUAL_PSEUDOCOLOR:
			fb_logo.needs_cmapreset = 1;
			break;
		}
	}

	/* Return if no suitable logo was found */
	fb_logo.logo = fb_find_logo(depth);
	
	if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
		fb_logo.logo = NULL;
		return 0;
	}
	/* What depth we asked for might be different from what we get */
	if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
		fb_logo.depth = 8;
	else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
		fb_logo.depth = 4;
	else
		fb_logo.depth = 1;		
	return fb_logo.logo->height;
}

int fb_show_logo(struct fb_info *info)
{
	u32 *palette = NULL, *saved_pseudo_palette = NULL;
	unsigned char *logo_new = NULL;
	struct fb_image image;
	int x;

	/* Return if the frame buffer is not mapped or suspended */
	if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
		return 0;

	image.depth = 8;
	image.data = fb_logo.logo->data;

	if (fb_logo.needs_cmapreset)
		fb_set_logocmap(info, fb_logo.logo);

	if (fb_logo.needs_truepalette || 
	    fb_logo.needs_directpalette) {
		palette = kmalloc(256 * 4, GFP_KERNEL);
		if (palette == NULL)
			return 0;

		if (fb_logo.needs_truepalette)
			fb_set_logo_truepalette(info, fb_logo.logo, palette);
		else
			fb_set_logo_directpalette(info, fb_logo.logo, palette);

		saved_pseudo_palette = info->pseudo_palette;
		info->pseudo_palette = palette;
	}

	if (fb_logo.depth <= 4) {
		logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height, 
				   GFP_KERNEL);
		if (logo_new == NULL) {
			kfree(palette);
			if (saved_pseudo_palette)
				info->pseudo_palette = saved_pseudo_palette;
			return 0;
		}
		image.data = logo_new;
		fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
	}

	image.width = fb_logo.logo->width;
	image.height = fb_logo.logo->height;
	image.dy = 0;

	for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
	     x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
		image.dx = x;
		info->fbops->fb_imageblit(info, &image);
	}
	
	kfree(palette);
	if (saved_pseudo_palette != NULL)
		info->pseudo_palette = saved_pseudo_palette;
	kfree(logo_new);
	return fb_logo.logo->height;
}
#else
int fb_prepare_logo(struct fb_info *info) { return 0; }
int fb_show_logo(struct fb_info *info) { return 0; }
#endif /* CONFIG_LOGO */

static int fbmem_read_proc(char *buf, char **start, off_t offset,
			   int len, int *eof, void *private)
{
	struct fb_info **fi;
	int clen;

	clen = 0;
	for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
		if (*fi)
			clen += sprintf(buf + clen, "%d %s\n",
				        (*fi)->node,
				        (*fi)->fix.id);
	*start = buf + offset;
	if (clen > offset)
		clen -= offset;
	else
		clen = 0;
	return clen < len ? clen : len;
}

static ssize_t
fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	unsigned long p = *ppos;
	struct inode *inode = file->f_dentry->d_inode;
	int fbidx = iminor(inode);
	struct fb_info *info = registered_fb[fbidx];
	u32 *buffer, *dst;
	u32 __iomem *src;
	int c, i, cnt = 0, err = 0;
	unsigned long total_size;

	if (!info || ! info->screen_base)
		return -ENODEV;

	if (info->state != FBINFO_STATE_RUNNING)
		return -EPERM;

	if (info->fbops->fb_read)
		return info->fbops->fb_read(file, buf, count, ppos);
	
	total_size = info->screen_size;
	if (total_size == 0)
		total_size = info->fix.smem_len;

	if (p >= total_size)
	    return 0;
	if (count >= total_size)
	    count = total_size;
	if (count + p > total_size)
		count = total_size - p;

	cnt = 0;
	buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
			 GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	src = (u32 __iomem *) (info->screen_base + p);

	if (info->fbops->fb_sync)
		info->fbops->fb_sync(info);

	while (count) {
		c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
		dst = buffer;
		for (i = c >> 2; i--; )
			*dst++ = fb_readl(src++);
		if (c & 3) {
			u8 *dst8 = (u8 *) dst;
			u8 __iomem *src8 = (u8 __iomem *) src;

			for (i = c & 3; i--;)
				*dst8++ = fb_readb(src8++);

			src = (u32 __iomem *) src8;
		}

		if (copy_to_user(buf, buffer, c)) {
			err = -EFAULT;
			break;
		}
		*ppos += c;
		buf += c;
		cnt += c;
		count -= c;
	}

	kfree(buffer);
	return (err) ? err : cnt;
}

static ssize_t
fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
	unsigned long p = *ppos;
	struct inode *inode = file->f_dentry->d_inode;
	int fbidx = iminor(inode);
	struct fb_info *info = registered_fb[fbidx];
	u32 *buffer, *src;
	u32 __iomem *dst;
	int c, i, cnt = 0, err;
	unsigned long total_size;

	if (!info || !info->screen_base)
		return -ENODEV;

	if (info->state != FBINFO_STATE_RUNNING)
		return -EPERM;

	if (info->fbops->fb_write)
		return info->fbops->fb_write(file, buf, count, ppos);
	
	total_size = info->screen_size;
	if (total_size == 0)
		total_size = info->fix.smem_len;

	if (p > total_size)
	    return -ENOSPC;
	if (count >= total_size)
	    count = total_size;
	err = 0;
	if (count + p > total_size) {
	    count = total_size - p;
	    err = -ENOSPC;
	}
	cnt = 0;
	buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
			 GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	dst = (u32 __iomem *) (info->screen_base + p);

	if (info->fbops->fb_sync)
		info->fbops->fb_sync(info);

	while (count) {
		c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
		src = buffer;
		if (copy_from_user(src, buf, c)) {
			err = -EFAULT;
			break;
		}
		for (i = c >> 2; i--; )
			fb_writel(*src++, dst++);
		if (c & 3) {
			u8 *src8 = (u8 *) src;
			u8 __iomem *dst8 = (u8 __iomem *) dst;

			for (i = c & 3; i--; )
				fb_writeb(*src8++, dst8++);

			dst = (u32 __iomem *) dst8;
		}
		*ppos += c;
		buf += c;
		cnt += c;
		count -= c;
	}
	kfree(buffer);

	return (err) ? err : cnt;
}

#ifdef CONFIG_KMOD
static void try_to_load(int fb)
{
	request_module("fb%d", fb);
}
#endif /* CONFIG_KMOD */

int
fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
{
        int xoffset = var->xoffset;
        int yoffset = var->yoffset;
        int err;

        if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
            xoffset + info->var.xres > info->var.xres_virtual ||
            yoffset + info->var.yres > info->var.yres_virtual)
                return -EINVAL;
	if ((err = info->fbops->fb_pan_display(var, info)))
		return err;
        info->var.xoffset = var->xoffset;
        info->var.yoffset = var->yoffset;
        if (var->vmode & FB_VMODE_YWRAP)
                info->var.vmode |= FB_VMODE_YWRAP;
        else
                info->var.vmode &= ~FB_VMODE_YWRAP;
        return 0;
}

int
fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
{
	int err, flags = info->flags;

	if (var->activate & FB_ACTIVATE_INV_MODE) {
		struct fb_videomode mode1, mode2;
		int ret = 0;

		fb_var_to_videomode(&mode1, var);
		fb_var_to_videomode(&mode2, &info->var);
		/* make sure we don't delete the videomode of current var */
		ret = fb_mode_is_equal(&mode1, &mode2);

		if (!ret) {
		    struct fb_event event;

		    event.info = info;
		    event.data = &mode1;
		    ret = notifier_call_chain(&fb_notifier_list,
					      FB_EVENT_MODE_DELETE, &event);
		}

		if (!ret)
		    fb_delete_videomode(&mode1, &info->modelist);

		return ret;
	}

	if ((var->activate & FB_ACTIVATE_FORCE) ||
	    memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
		if (!info->fbops->fb_check_var) {
			*var = info->var;
			return 0;
		}

		if ((err = info->fbops->fb_check_var(var, info)))
			return err;

		if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
			struct fb_videomode mode;
			int err = 0;

			info->var = *var;
			if (info->fbops->fb_set_par)
				info->fbops->fb_set_par(info);

			fb_pan_display(info, &info->var);

			fb_set_cmap(&info->cmap, info);

			fb_var_to_videomode(&mode, &info->var);

			if (info->modelist.prev && info->modelist.next &&
			    !list_empty(&info->modelist))
				err = fb_add_videomode(&mode, &info->modelist);

			if (!err && (flags & FBINFO_MISC_USEREVENT)) {
				struct fb_event event;

				info->flags &= ~FBINFO_MISC_USEREVENT;
				event.info = info;
				notifier_call_chain(&fb_notifier_list,
						    FB_EVENT_MODE_CHANGE,
						    &event);
			}
		}
	}
	return 0;
}

int
fb_blank(struct fb_info *info, int blank)
{	
 	int ret = -EINVAL;

 	if (blank > FB_BLANK_POWERDOWN)
 		blank = FB_BLANK_POWERDOWN;

	if (info->fbops->fb_blank)
 		ret = info->fbops->fb_blank(blank, info);

 	if (!ret) {
		struct fb_event event;

		event.info = info;
		event.data = &blank;
		notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
	}

 	return ret;
}

static int 
fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	 unsigned long arg)
{
	int fbidx = iminor(inode);
	struct fb_info *info = registered_fb[fbidx];
	struct fb_ops *fb = info->fbops;
	struct fb_var_screeninfo var;
	struct fb_fix_screeninfo fix;
	struct fb_con2fbmap con2fb;
	struct fb_cmap_user cmap;
	struct fb_event event;
	void __user *argp = (void __user *)arg;
	int i;
	
	if (!fb)
		return -ENODEV;
	switch (cmd) {
	case FBIOGET_VSCREENINFO:
		return copy_to_user(argp, &info->var,
				    sizeof(var)) ? -EFAULT : 0;
	case FBIOPUT_VSCREENINFO:
		if (copy_from_user(&var, argp, sizeof(var)))
			return -EFAULT;
		acquire_console_sem();
		info->flags |= FBINFO_MISC_USEREVENT;
		i = fb_set_var(info, &var);
		info->flags &= ~FBINFO_MISC_USEREVENT;
		release_console_sem();
		if (i) return i;
		if (copy_to_user(argp, &var, sizeof(var)))
			return -EFAULT;
		return 0;
	case FBIOGET_FSCREENINFO:
		return copy_to_user(argp, &info->fix,
				    sizeof(fix)) ? -EFAULT : 0;
	case FBIOPUTCMAP:
		if (copy_from_user(&cmap, argp, sizeof(cmap)))
			return -EFAULT;
		return (fb_set_user_cmap(&cmap, info));
	case FBIOGETCMAP:
		if (copy_from_user(&cmap, argp, sizeof(cmap)))
			return -EFAULT;
		return fb_cmap_to_user(&info->cmap, &cmap);
	case FBIOPAN_DISPLAY:
		if (copy_from_user(&var, argp, sizeof(var)))
			return -EFAULT;
		acquire_console_sem();
		i = fb_pan_display(info, &var);
		release_console_sem();
		if (i)
			return i;
		if (copy_to_user(argp, &var, sizeof(var)))
			return -EFAULT;
		return 0;
	case FBIO_CURSOR:
		return -EINVAL;
	case FBIOGET_CON2FBMAP:
		if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
			return -EFAULT;
		if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
		    return -EINVAL;
		con2fb.framebuffer = -1;
		event.info = info;
		event.data = &con2fb;
		notifier_call_chain(&fb_notifier_list,
				    FB_EVENT_GET_CONSOLE_MAP, &event);
		return copy_to_user(argp, &con2fb,
				    sizeof(con2fb)) ? -EFAULT : 0;
	case FBIOPUT_CON2FBMAP:
		if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
			return - EFAULT;
		if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
		    return -EINVAL;
		if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
		    return -EINVAL;
#ifdef CONFIG_KMOD
		if (!registered_fb[con2fb.framebuffer])
		    try_to_load(con2fb.framebuffer);
#endif /* CONFIG_KMOD */
		if (!registered_fb[con2fb.framebuffer])
		    return -EINVAL;
		event.info = info;
		event.data = &con2fb;
		return notifier_call_chain(&fb_notifier_list,
					   FB_EVENT_SET_CONSOLE_MAP,
					   &event);
	case FBIOBLANK:
		acquire_console_sem();
		info->flags |= FBINFO_MISC_USEREVENT;
		i = fb_blank(info, arg);
		info->flags &= ~FBINFO_MISC_USEREVENT;
		release_console_sem();
		return i;
	default:
		if (fb->fb_ioctl == NULL)
			return -EINVAL;
		return fb->fb_ioctl(inode, file, cmd, arg, info);
	}
}

#ifdef CONFIG_COMPAT
static long
fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int fbidx = iminor(file->f_dentry->d_inode);
	struct fb_info *info = registered_fb[fbidx];
	struct fb_ops *fb = info->fbops;
	long ret;

	if (fb->fb_compat_ioctl == NULL)
		return -ENOIOCTLCMD;
	lock_kernel();
	ret = fb->fb_compat_ioctl(file, cmd, arg, info);
	unlock_kernel();
	return ret;
}
#endif

static int 
fb_mmap(struct file *file, struct vm_area_struct * vma)
{
	int fbidx = iminor(file->f_dentry->d_inode);
	struct fb_info *info = registered_fb[fbidx];
	struct fb_ops *fb = info->fbops;
	unsigned long off;
#if !defined(__sparc__) || defined(__sparc_v9__)
	unsigned long start;
	u32 len;
#endif

	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
		return -EINVAL;
	off = vma->vm_pgoff << PAGE_SHIFT;
	if (!fb)
		return -ENODEV;
	if (fb->fb_mmap) {
		int res;
		lock_kernel();
		res = fb->fb_mmap(info, file, vma);
		unlock_kernel();
		return res;
	}

#if defined(__sparc__) && !defined(__sparc_v9__)
	/* Should never get here, all fb drivers should have their own
	   mmap routines */
	return -EINVAL;
#else
	/* !sparc32... */
	lock_kernel();

	/* frame buffer memory */
	start = info->fix.smem_start;
	len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
	if (off >= len) {
		/* memory mapped io */
		off -= len;
		if (info->var.accel_flags) {
			unlock_kernel();
			return -EINVAL;
		}
		start = info->fix.mmio_start;
		len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
	}
	unlock_kernel();
	start &= PAGE_MASK;
	if ((vma->vm_end - vma->vm_start + off) > len)
		return -EINVAL;
	off += start;
	vma->vm_pgoff = off >> PAGE_SHIFT;
	/* This is an IO map - tell maydump to skip this VMA */
	vma->vm_flags |= VM_IO | VM_RESERVED;
#if defined(__sparc_v9__)
	if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
				vma->vm_end - vma->vm_start, vma->vm_page_prot))
		return -EAGAIN;
#else
#if defined(__mc68000__)
#if defined(CONFIG_SUN3)
	pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
#elif defined(CONFIG_MMU)
	if (CPU_IS_020_OR_030)
		pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
	if (CPU_IS_040_OR_060) {
		pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
		/* Use no-cache mode, serialized */
		pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
	}
#endif
#elif defined(__powerpc__)
	vma->vm_page_prot = phys_mem_access_prot(file, off,
						 vma->vm_end - vma->vm_start,
						 vma->vm_page_prot);
#elif defined(__alpha__)
	/* Caching is off in the I/O space quadrant by design.  */
#elif defined(__i386__) || defined(__x86_64__)
	if (boot_cpu_data.x86 > 3)
		pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
#elif defined(__mips__)
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#elif defined(__hppa__)
	pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
#elif defined(__ia64__)
	if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
	else
		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#else
#warning What do we have to do here??
#endif
	if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
			     vma->vm_end - vma->vm_start, vma->vm_page_prot))
		return -EAGAIN;
#endif /* !__sparc_v9__ */
	return 0;
#endif /* !sparc32 */
}

static int
fb_open(struct inode *inode, struct file *file)
{
	int fbidx = iminor(inode);
	struct fb_info *info;
	int res = 0;

	if (fbidx >= FB_MAX)
		return -ENODEV;
#ifdef CONFIG_KMOD
	if (!(info = registered_fb[fbidx]))
		try_to_load(fbidx);
#endif /* CONFIG_KMOD */
	if (!(info = registered_fb[fbidx]))
		return -ENODEV;
	if (!try_module_get(info->fbops->owner))
		return -ENODEV;
	if (info->fbops->fb_open) {
		res = info->fbops->fb_open(info,1);
		if (res)
			module_put(info->fbops->owner);
	}
	return res;
}

static int 
fb_release(struct inode *inode, struct file *file)
{
	int fbidx = iminor(inode);
	struct fb_info *info;

	lock_kernel();
	info = registered_fb[fbidx];
	if (info->fbops->fb_release)
		info->fbops->fb_release(info,1);
	module_put(info->fbops->owner);
	unlock_kernel();
	return 0;
}

static struct file_operations fb_fops = {
	.owner =	THIS_MODULE,
	.read =		fb_read,
	.write =	fb_write,
	.ioctl =	fb_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = fb_compat_ioctl,
#endif
	.mmap =		fb_mmap,
	.open =		fb_open,
	.release =	fb_release,
#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
	.get_unmapped_area = get_fb_unmapped_area,
#endif
};

static struct class *fb_class;

/**
 *	register_framebuffer - registers a frame buffer device
 *	@fb_info: frame buffer info structure
 *
 *	Registers a frame buffer device @fb_info.
 *
 *	Returns negative errno on error, or zero for success.
 *
 */

int
register_framebuffer(struct fb_info *fb_info)
{
	int i;
	struct fb_event event;

	if (num_registered_fb == FB_MAX)
		return -ENXIO;
	num_registered_fb++;
	for (i = 0 ; i < FB_MAX; i++)
		if (!registered_fb[i])
			break;
	fb_info->node = i;

	fb_info->class_device = class_device_create(fb_class, MKDEV(FB_MAJOR, i),
				    fb_info->device, "fb%d", i);
	if (IS_ERR(fb_info->class_device)) {
		/* Not fatal */
		printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
		fb_info->class_device = NULL;
	} else
		fb_init_class_device(fb_info);

	if (fb_info->pixmap.addr == NULL) {
		fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
		if (fb_info->pixmap.addr) {
			fb_info->pixmap.size = FBPIXMAPSIZE;
			fb_info->pixmap.buf_align = 1;
			fb_info->pixmap.scan_align = 1;
			fb_info->pixmap.access_align = 32;
			fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
		}
	}	
	fb_info->pixmap.offset = 0;

	if (!fb_info->modelist.prev ||
	    !fb_info->modelist.next ||
	    list_empty(&fb_info->modelist)) {
	        struct fb_videomode mode;

		INIT_LIST_HEAD(&fb_info->modelist);
		fb_var_to_videomode(&mode, &fb_info->var);
		fb_add_videomode(&mode, &fb_info->modelist);
	}

	registered_fb[i] = fb_info;

	devfs_mk_cdev(MKDEV(FB_MAJOR, i),
			S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
	event.info = fb_info;
	notifier_call_chain(&fb_notifier_list,
			    FB_EVENT_FB_REGISTERED, &event);
	return 0;
}


/**
 *	unregister_framebuffer - releases a frame buffer device
 *	@fb_info: frame buffer info structure
 *
 *	Unregisters a frame buffer device @fb_info.
 *
 *	Returns negative errno on error, or zero for success.
 *
 */

int
unregister_framebuffer(struct fb_info *fb_info)
{
	int i;

	i = fb_info->node;
	if (!registered_fb[i])
		return -EINVAL;
	devfs_remove("fb/%d", i);

	if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
		kfree(fb_info->pixmap.addr);
	fb_destroy_modelist(&fb_info->modelist);
	registered_fb[i]=NULL;
	num_registered_fb--;
	fb_cleanup_class_device(fb_info);
	class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
	return 0;
}

/**
 *	fb_register_client - register a client notifier
 *	@nb: notifier block to callback on events
 */
int fb_register_client(struct notifier_block *nb)
{
	return notifier_chain_register(&fb_notifier_list, nb);
}

/**
 *	fb_unregister_client - unregister a client notifier
 *	@nb: notifier block to callback on events
 */
int fb_unregister_client(struct notifier_block *nb)
{
	return notifier_chain_unregister(&fb_notifier_list, nb);
}

/**
 *	fb_set_suspend - low level driver signals suspend
 *	@info: framebuffer affected
 *	@state: 0 = resuming, !=0 = suspending
 *
 *	This is meant to be used by low level drivers to
 * 	signal suspend/resume to the core & clients.
 *	It must be called with the console semaphore held
 */
void fb_set_suspend(struct fb_info *info, int state)
{
	struct fb_event event;

	event.info = info;
	if (state) {
		notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
		info->state = FBINFO_STATE_SUSPENDED;
	} else {
		info->state = FBINFO_STATE_RUNNING;
		notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
	}
}

/**
 *	fbmem_init - init frame buffer subsystem
 *
 *	Initialize the frame buffer subsystem.
 *
 *	NOTE: This function is _only_ to be called by drivers/char/mem.c.
 *
 */

static int __init
fbmem_init(void)
{
	create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);

	devfs_mk_dir("fb");
	if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
		printk("unable to get major %d for fb devs\n", FB_MAJOR);

	fb_class = class_create(THIS_MODULE, "graphics");
	if (IS_ERR(fb_class)) {
		printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
		fb_class = NULL;
	}
	return 0;
}

#ifdef MODULE
module_init(fbmem_init);
static void __exit
fbmem_exit(void)
{
	class_destroy(fb_class);
	unregister_chrdev(FB_MAJOR, "fb");
}

module_exit(fbmem_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Framebuffer base");
#else
subsys_initcall(fbmem_init);
#endif

int fb_new_modelist(struct fb_info *info)
{
	struct fb_event event;
	struct fb_var_screeninfo var = info->var;
	struct list_head *pos, *n;
	struct fb_modelist *modelist;
	struct fb_videomode *m, mode;
	int err = 1;

	list_for_each_safe(pos, n, &info->modelist) {
		modelist = list_entry(pos, struct fb_modelist, list);
		m = &modelist->mode;
		fb_videomode_to_var(&var, m);
		var.activate = FB_ACTIVATE_TEST;
		err = fb_set_var(info, &var);
		fb_var_to_videomode(&mode, &var);
		if (err || !fb_mode_is_equal(m, &mode)) {
			list_del(pos);
			kfree(pos);
		}
	}

	err = 1;

	if (!list_empty(&info->modelist)) {
		event.info = info;
		err = notifier_call_chain(&fb_notifier_list,
					   FB_EVENT_NEW_MODELIST,
					   &event);
	}

	return err;
}

static char *video_options[FB_MAX];
static int ofonly;

extern const char *global_mode_option;

/**
 * fb_get_options - get kernel boot parameters
 * @name:   framebuffer name as it would appear in
 *          the boot parameter line
 *          (video=<name>:<options>)
 * @option: the option will be stored here
 *
 * NOTE: Needed to maintain backwards compatibility
 */
int fb_get_options(char *name, char **option)
{
	char *opt, *options = NULL;
	int opt_len, retval = 0;
	int name_len = strlen(name), i;

	if (name_len && ofonly && strncmp(name, "offb", 4))
		retval = 1;

	if (name_len && !retval) {
		for (i = 0; i < FB_MAX; i++) {
			if (video_options[i] == NULL)
				continue;
			opt_len = strlen(video_options[i]);
			if (!opt_len)
				continue;
			opt = video_options[i];
			if (!strncmp(name, opt, name_len) &&
			    opt[name_len] == ':')
				options = opt + name_len + 1;
		}
	}
	if (options && !strncmp(options, "off", 3))
		retval = 1;

	if (option)
		*option = options;

	return retval;
}

/**
 *	video_setup - process command line options
 *	@options: string of options
 *
 *	Process command line options for frame buffer subsystem.
 *
 *	NOTE: This function is a __setup and __init function.
 *            It only stores the options.  Drivers have to call
 *            fb_get_options() as necessary.
 *
 *	Returns zero.
 *
 */
static int __init video_setup(char *options)
{
	int i, global = 0;

	if (!options || !*options)
 		global = 1;

 	if (!global && !strncmp(options, "ofonly", 6)) {
 		ofonly = 1;
 		global = 1;
 	}

 	if (!global && !strstr(options, "fb:")) {
 		global_mode_option = options;
 		global = 1;
 	}

 	if (!global) {
 		for (i = 0; i < FB_MAX; i++) {
 			if (video_options[i] == NULL) {
 				video_options[i] = options;
 				break;
 			}

		}
	}

	return 0;
}
__setup("video=", video_setup);

    /*
     *  Visible symbols for modules
     */

EXPORT_SYMBOL(register_framebuffer);
EXPORT_SYMBOL(unregister_framebuffer);
EXPORT_SYMBOL(num_registered_fb);
EXPORT_SYMBOL(registered_fb);
EXPORT_SYMBOL(fb_prepare_logo);
EXPORT_SYMBOL(fb_show_logo);
EXPORT_SYMBOL(fb_set_var);
EXPORT_SYMBOL(fb_blank);
EXPORT_SYMBOL(fb_pan_display);
EXPORT_SYMBOL(fb_get_buffer_offset);
EXPORT_SYMBOL(fb_set_suspend);
EXPORT_SYMBOL(fb_register_client);
EXPORT_SYMBOL(fb_unregister_client);
EXPORT_SYMBOL(fb_get_options);
EXPORT_SYMBOL(fb_new_modelist);

MODULE_LICENSE("GPL");