summaryrefslogtreecommitdiff
path: root/drivers/video/fbsysfs.c
blob: 67afa9c2289d539e281bb831aa2260c0fba1205b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
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
/*
 * fbsysfs.c - framebuffer device class and attributes
 *
 * Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
 * 
 *	This program is free software you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

/*
 * Note:  currently there's only stubs for framebuffer_alloc and
 * framebuffer_release here.  The reson for that is that until all drivers
 * are converted to use it a sysfsification will open OOPSable races.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/module.h>

#define FB_SYSFS_FLAG_ATTR 1

/**
 * framebuffer_alloc - creates a new frame buffer info structure
 *
 * @size: size of driver private data, can be zero
 * @dev: pointer to the device for this fb, this can be NULL
 *
 * Creates a new frame buffer info structure. Also reserves @size bytes
 * for driver private data (info->par). info->par (if any) will be
 * aligned to sizeof(long).
 *
 * Returns the new structure, or NULL if an error occurred.
 *
 */
struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
{
#define BYTES_PER_LONG (BITS_PER_LONG/8)
#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
	int fb_info_size = sizeof(struct fb_info);
	struct fb_info *info;
	char *p;

	if (size)
		fb_info_size += PADDING;

	p = kzalloc(fb_info_size + size, GFP_KERNEL);

	if (!p)
		return NULL;

	info = (struct fb_info *) p;

	if (size)
		info->par = p + fb_info_size;

	info->device = dev;

#ifdef CONFIG_FB_BACKLIGHT
	mutex_init(&info->bl_curve_mutex);
#endif

	return info;
#undef PADDING
#undef BYTES_PER_LONG
}
EXPORT_SYMBOL(framebuffer_alloc);

/**
 * framebuffer_release - marks the structure available for freeing
 *
 * @info: frame buffer info structure
 *
 * Drop the reference count of the device embedded in the
 * framebuffer info structure.
 *
 */
void framebuffer_release(struct fb_info *info)
{
	kfree(info->apertures);
	kfree(info);
}
EXPORT_SYMBOL(framebuffer_release);

static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
{
	int err;

	var->activate |= FB_ACTIVATE_FORCE;
	console_lock();
	fb_info->flags |= FBINFO_MISC_USEREVENT;
	err = fb_set_var(fb_info, var);
	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	console_unlock();
	if (err)
		return err;
	return 0;
}

static int mode_string(char *buf, unsigned int offset,
		       const struct fb_videomode *mode)
{
	char m = 'U';
	char v = 'p';

	if (mode->flag & FB_MODE_IS_DETAILED)
		m = 'D';
	if (mode->flag & FB_MODE_IS_VESA)
		m = 'V';
	if (mode->flag & FB_MODE_IS_STANDARD)
		m = 'S';

	if (mode->vmode & FB_VMODE_INTERLACED)
		v = 'i';
	if (mode->vmode & FB_VMODE_DOUBLE)
		v = 'd';

	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	                m, mode->xres, mode->yres, v, mode->refresh);
}

static ssize_t store_mode(struct device *device, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	char mstr[100];
	struct fb_var_screeninfo var;
	struct fb_modelist *modelist;
	struct fb_videomode *mode;
	struct list_head *pos;
	size_t i;
	int err;

	memset(&var, 0, sizeof(var));

	list_for_each(pos, &fb_info->modelist) {
		modelist = list_entry(pos, struct fb_modelist, list);
		mode = &modelist->mode;
		i = mode_string(mstr, 0, mode);
		if (strncmp(mstr, buf, max(count, i)) == 0) {

			var = fb_info->var;
			fb_videomode_to_var(&var, mode);
			if ((err = activate(fb_info, &var)))
				return err;
			fb_info->mode = mode;
			return count;
		}
	}
	return -EINVAL;
}

static ssize_t show_mode(struct device *device, struct device_attribute *attr,
			 char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);

	if (!fb_info->mode)
		return 0;

	return mode_string(buf, 0, fb_info->mode);
}

static ssize_t store_modes(struct device *device,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	LIST_HEAD(old_list);
	int i = count / sizeof(struct fb_videomode);

	if (i * sizeof(struct fb_videomode) != count)
		return -EINVAL;

	console_lock();
	list_splice(&fb_info->modelist, &old_list);
	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
				 &fb_info->modelist);
	if (fb_new_modelist(fb_info)) {
		fb_destroy_modelist(&fb_info->modelist);
		list_splice(&old_list, &fb_info->modelist);
	} else
		fb_destroy_modelist(&old_list);

	console_unlock();

	return 0;
}

static ssize_t show_modes(struct device *device, struct device_attribute *attr,
			  char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	unsigned int i;
	struct list_head *pos;
	struct fb_modelist *modelist;
	const struct fb_videomode *mode;

	i = 0;
	list_for_each(pos, &fb_info->modelist) {
		modelist = list_entry(pos, struct fb_modelist, list);
		mode = &modelist->mode;
		i += mode_string(buf, i, mode);
	}
	return i;
}

static ssize_t store_bpp(struct device *device, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char ** last = NULL;
	int err;

	var = fb_info->var;
	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	if ((err = activate(fb_info, &var)))
		return err;
	return count;
}

static ssize_t show_bpp(struct device *device, struct device_attribute *attr,
			char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
}

static ssize_t store_rotate(struct device *device,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char **last = NULL;
	int err;

	var = fb_info->var;
	var.rotate = simple_strtoul(buf, last, 0);

	if ((err = activate(fb_info, &var)))
		return err;

	return count;
}


static ssize_t show_rotate(struct device *device,
			   struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);

	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
}

static ssize_t store_virtual(struct device *device,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char *last = NULL;
	int err;

	var = fb_info->var;
	var.xres_virtual = simple_strtoul(buf, &last, 0);
	last++;
	if (last - buf >= count)
		return -EINVAL;
	var.yres_virtual = simple_strtoul(last, &last, 0);

	if ((err = activate(fb_info, &var)))
		return err;
	return count;
}

static ssize_t show_virtual(struct device *device,
			    struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
			fb_info->var.yres_virtual);
}

static ssize_t show_stride(struct device *device,
			   struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
}

static ssize_t store_blank(struct device *device,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	char *last = NULL;
	int err;

	console_lock();
	fb_info->flags |= FBINFO_MISC_USEREVENT;
	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	console_unlock();
	if (err < 0)
		return err;
	return count;
}

static ssize_t show_blank(struct device *device,
			  struct device_attribute *attr, char *buf)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t store_console(struct device *device,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t show_console(struct device *device,
			    struct device_attribute *attr, char *buf)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t store_cursor(struct device *device,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t show_cursor(struct device *device,
			   struct device_attribute *attr, char *buf)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t store_pan(struct device *device,
			 struct device_attribute *attr,
			 const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char *last = NULL;
	int err;

	var = fb_info->var;
	var.xoffset = simple_strtoul(buf, &last, 0);
	last++;
	if (last - buf >= count)
		return -EINVAL;
	var.yoffset = simple_strtoul(last, &last, 0);

	console_lock();
	err = fb_pan_display(fb_info, &var);
	console_unlock();

	if (err < 0)
		return err;
	return count;
}

static ssize_t show_pan(struct device *device,
			struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
			fb_info->var.yoffset);
}

static ssize_t show_name(struct device *device,
			 struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);

	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
}

static ssize_t store_fbstate(struct device *device,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	u32 state;
	char *last = NULL;

	state = simple_strtoul(buf, &last, 0);

	if (!lock_fb_info(fb_info))
		return -ENODEV;
	console_lock();
	fb_set_suspend(fb_info, (int)state);
	console_unlock();
	unlock_fb_info(fb_info);

	return count;
}

static ssize_t show_fbstate(struct device *device,
			    struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
}

#ifdef CONFIG_FB_BACKLIGHT
static ssize_t store_bl_curve(struct device *device,
			      struct device_attribute *attr,
			      const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	unsigned int i;

	/* Some drivers don't use framebuffer_alloc(), but those also
	 * don't have backlights.
	 */
	if (!fb_info || !fb_info->bl_dev)
		return -ENODEV;

	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
		return -EINVAL;

	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
		if (sscanf(&buf[i * 24],
			"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
			&tmp_curve[i * 8 + 0],
			&tmp_curve[i * 8 + 1],
			&tmp_curve[i * 8 + 2],
			&tmp_curve[i * 8 + 3],
			&tmp_curve[i * 8 + 4],
			&tmp_curve[i * 8 + 5],
			&tmp_curve[i * 8 + 6],
			&tmp_curve[i * 8 + 7]) != 8)
			return -EINVAL;

	/* If there has been an error in the input data, we won't
	 * reach this loop.
	 */
	mutex_lock(&fb_info->bl_curve_mutex);
	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
		fb_info->bl_curve[i] = tmp_curve[i];
	mutex_unlock(&fb_info->bl_curve_mutex);

	return count;
}

static ssize_t show_bl_curve(struct device *device,
			     struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	ssize_t len = 0;
	unsigned int i;

	/* Some drivers don't use framebuffer_alloc(), but those also
	 * don't have backlights.
	 */
	if (!fb_info || !fb_info->bl_dev)
		return -ENODEV;

	mutex_lock(&fb_info->bl_curve_mutex);
	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
		len += snprintf(&buf[len], PAGE_SIZE,
				"%02x %02x %02x %02x %02x %02x %02x %02x\n",
				fb_info->bl_curve[i + 0],
				fb_info->bl_curve[i + 1],
				fb_info->bl_curve[i + 2],
				fb_info->bl_curve[i + 3],
				fb_info->bl_curve[i + 4],
				fb_info->bl_curve[i + 5],
				fb_info->bl_curve[i + 6],
				fb_info->bl_curve[i + 7]);
	mutex_unlock(&fb_info->bl_curve_mutex);

	return len;
}
#endif

/* When cmap is added back in it should be a binary attribute
 * not a text one. Consideration should also be given to converting
 * fbdev to use configfs instead of sysfs */
static struct device_attribute device_attrs[] = {
	__ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
	__ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
	__ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console),
	__ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor),
	__ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode),
	__ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes),
	__ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan),
	__ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual),
	__ATTR(name, S_IRUGO, show_name, NULL),
	__ATTR(stride, S_IRUGO, show_stride, NULL),
	__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
	__ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
#ifdef CONFIG_FB_BACKLIGHT
	__ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve),
#endif
};

int fb_init_device(struct fb_info *fb_info)
{
	int i, error = 0;

	dev_set_drvdata(fb_info->dev, fb_info);

	fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;

	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
		error = device_create_file(fb_info->dev, &device_attrs[i]);

		if (error)
			break;
	}

	if (error) {
		while (--i >= 0)
			device_remove_file(fb_info->dev, &device_attrs[i]);
		fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	}

	return 0;
}

void fb_cleanup_device(struct fb_info *fb_info)
{
	unsigned int i;

	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
		for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
			device_remove_file(fb_info->dev, &device_attrs[i]);

		fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	}
}

#ifdef CONFIG_FB_BACKLIGHT
/* This function generates a linear backlight curve
 *
 *     0: off
 *   1-7: min
 * 8-127: linear from min to max
 */
void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
{
	unsigned int i, flat, count, range = (max - min);

	mutex_lock(&fb_info->bl_curve_mutex);

	fb_info->bl_curve[0] = off;

	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
		fb_info->bl_curve[flat] = min;

	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	for (i = 0; i < count; ++i)
		fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);

	mutex_unlock(&fb_info->bl_curve_mutex);
}
EXPORT_SYMBOL_GPL(fb_bl_default_curve);
#endif