fbsysfs.c 14.2 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
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
/*
 * 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/fb.h>
#include <linux/console.h>

/**
 * 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 occured.
 *
 */
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;

46
47
	p = kzalloc(fb_info_size + size, GFP_KERNEL);

Linus Torvalds's avatar
Linus Torvalds committed
48
49
	if (!p)
		return NULL;
50

Linus Torvalds's avatar
Linus Torvalds committed
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
	info = (struct fb_info *) p;

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

	info->device = dev;

	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 class_device embedded in the
 * framebuffer info structure.
 *
 */
void framebuffer_release(struct fb_info *info)
{
	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;
	acquire_console_sem();
	fb_info->flags |= FBINFO_MISC_USEREVENT;
	err = fb_set_var(fb_info, var);
	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	release_console_sem();
	if (err)
		return err;
	return 0;
}

static int mode_string(char *buf, unsigned int offset,
		       const struct fb_videomode *mode)
{
	char m = 'U';
	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';
	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d-%d\n", m, mode->xres, mode->yres, mode->refresh);
}

static ssize_t store_mode(struct class_device *class_device, const char * buf,
			  size_t count)
{
110
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
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
	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 class_device *class_device, char *buf)
{
140
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
141
142
143
144
145
146
147
148
149
150

	if (!fb_info->mode)
		return 0;

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

static ssize_t store_modes(struct class_device *class_device, const char * buf,
			   size_t count)
{
151
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
	LIST_HEAD(old_list);
	int i = count / sizeof(struct fb_videomode);

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

	acquire_console_sem();
	list_splice(&fb_info->modelist, &old_list);
	fb_videomode_to_modelist((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);

	release_console_sem();

	return 0;
}

static ssize_t show_modes(struct class_device *class_device, char *buf)
{
175
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
	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 class_device *class_device, const char * buf,
			 size_t count)
{
193
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
194
195
196
197
198
199
200
201
202
203
204
205
206
	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 class_device *class_device, char *buf)
{
207
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
208
209
210
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
}

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
static ssize_t store_rotate(struct class_device *class_device, const char *buf,
			    size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);

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

static ssize_t store_con_rotate(struct class_device *class_device,
				const char *buf, size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	int rotate;
	char **last = NULL;

	acquire_console_sem();
	rotate = simple_strtoul(buf, last, 0);
	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE, &rotate);
	release_console_sem();
	return count;
}

static ssize_t store_con_rotate_all(struct class_device *class_device,
				const char *buf, size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	int rotate;
	char **last = NULL;

	acquire_console_sem();
	rotate = simple_strtoul(buf, last, 0);
	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE_ALL, &rotate);
	release_console_sem();
	return count;
}

static ssize_t show_con_rotate(struct class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	int rotate;

	acquire_console_sem();
	rotate = fb_con_duit(fb_info, FB_EVENT_GET_CON_ROTATE, NULL);
	release_console_sem();
	return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
}

Linus Torvalds's avatar
Linus Torvalds committed
275
276
277
static ssize_t store_virtual(struct class_device *class_device,
			     const char * buf, size_t count)
{
278
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
	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 class_device *class_device, char *buf)
{
297
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
298
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
299
			fb_info->var.yres_virtual);
Linus Torvalds's avatar
Linus Torvalds committed
300
301
}

302
303
static ssize_t show_stride(struct class_device *class_device, char *buf)
{
304
	struct fb_info *fb_info = class_get_devdata(class_device);
305
306
307
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
}

Jon Smirl's avatar
Jon Smirl committed
308
309
/* Format for cmap is "%02x%c%4x%4x%4x\n" */
/* %02x entry %c transp %4x red %4x blue %4x green \n */
Jon Smirl's avatar
Jon Smirl committed
310
311
/* 256 rows at 16 chars equals 4096, the normal page size */
/* the code will automatically adjust for different page sizes */
Jon Smirl's avatar
Jon Smirl committed
312
static ssize_t store_cmap(struct class_device *class_device, const char *buf,
Linus Torvalds's avatar
Linus Torvalds committed
313
314
			  size_t count)
{
315
	struct fb_info *fb_info = class_get_devdata(class_device);
Jon Smirl's avatar
Jon Smirl committed
316
317
	int rc, i, start, length, transp = 0;

Jon Smirl's avatar
Jon Smirl committed
318
	if ((count > PAGE_SIZE) || ((count % 16) != 0))
Jon Smirl's avatar
Jon Smirl committed
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
		return -EINVAL;

	if (!fb_info->fbops->fb_setcolreg && !fb_info->fbops->fb_setcmap)
		return -EINVAL;

	sscanf(buf, "%02x", &start);
	length = count / 16;

	for (i = 0; i < length; i++)
		if (buf[i * 16 + 2] != ' ')
			transp = 1;

	/* If we can batch, do it */
	if (fb_info->fbops->fb_setcmap && length > 1) {
		struct fb_cmap umap;

		memset(&umap, 0, sizeof(umap));
		if ((rc = fb_alloc_cmap(&umap, length, transp)))
			return rc;

		umap.start = start;
		for (i = 0; i < length; i++) {
			sscanf(&buf[i * 16 +  3], "%4hx", &umap.red[i]);
			sscanf(&buf[i * 16 +  7], "%4hx", &umap.blue[i]);
			sscanf(&buf[i * 16 + 11], "%4hx", &umap.green[i]);
			if (transp)
				umap.transp[i] = (buf[i * 16 +  2] != ' ');
		}
		rc = fb_info->fbops->fb_setcmap(&umap, fb_info);
		fb_copy_cmap(&umap, &fb_info->cmap);
		fb_dealloc_cmap(&umap);

351
		return rc ?: count;
Jon Smirl's avatar
Jon Smirl committed
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
	}
	for (i = 0; i < length; i++) {
		u16 red, blue, green, tsp;

		sscanf(&buf[i * 16 +  3], "%4hx", &red);
		sscanf(&buf[i * 16 +  7], "%4hx", &blue);
		sscanf(&buf[i * 16 + 11], "%4hx", &green);
		tsp = (buf[i * 16 +  2] != ' ');
		if ((rc = fb_info->fbops->fb_setcolreg(start++,
				      red, green, blue, tsp, fb_info)))
			return rc;

		fb_info->cmap.red[i] = red;
		fb_info->cmap.blue[i] = blue;
		fb_info->cmap.green[i] = green;
		if (transp)
			fb_info->cmap.transp[i] = tsp;
	}
370
	return count;
Linus Torvalds's avatar
Linus Torvalds committed
371
372
373
374
}

static ssize_t show_cmap(struct class_device *class_device, char *buf)
{
375
	struct fb_info *fb_info = class_get_devdata(class_device);
Jon Smirl's avatar
Jon Smirl committed
376
	unsigned int i;
Linus Torvalds's avatar
Linus Torvalds committed
377
378

	if (!fb_info->cmap.red || !fb_info->cmap.blue ||
Jon Smirl's avatar
Jon Smirl committed
379
380
381
	   !fb_info->cmap.green)
		return -EINVAL;

Jon Smirl's avatar
Jon Smirl committed
382
	if (fb_info->cmap.len > PAGE_SIZE / 16)
Linus Torvalds's avatar
Linus Torvalds committed
383
384
		return -EINVAL;

Jon Smirl's avatar
Jon Smirl committed
385
	/* don't mess with the format, the buffer is PAGE_SIZE */
Jon Smirl's avatar
Jon Smirl committed
386
	/* 256 entries at 16 chars per line equals 4096 = PAGE_SIZE */
Linus Torvalds's avatar
Linus Torvalds committed
387
	for (i = 0; i < fb_info->cmap.len; i++) {
Jon Smirl's avatar
Jon Smirl committed
388
		snprintf(&buf[ i * 16], PAGE_SIZE - i * 16, "%02x%c%4x%4x%4x\n", i + fb_info->cmap.start,
Jon Smirl's avatar
Jon Smirl committed
389
390
391
			((fb_info->cmap.transp && fb_info->cmap.transp[i]) ? '*' : ' '),
			fb_info->cmap.red[i], fb_info->cmap.blue[i],
			fb_info->cmap.green[i]);
Linus Torvalds's avatar
Linus Torvalds committed
392
	}
Jon Smirl's avatar
Jon Smirl committed
393
	return 16 * fb_info->cmap.len;
Linus Torvalds's avatar
Linus Torvalds committed
394
395
396
397
398
}

static ssize_t store_blank(struct class_device *class_device, const char * buf,
			   size_t count)
{
399
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
	char *last = NULL;
	int err;

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

static ssize_t show_blank(struct class_device *class_device, char *buf)
{
415
//	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
416
417
418
419
420
421
	return 0;
}

static ssize_t store_console(struct class_device *class_device,
			     const char * buf, size_t count)
{
422
//	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
423
424
425
426
427
	return 0;
}

static ssize_t show_console(struct class_device *class_device, char *buf)
{
428
//	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
429
430
431
432
433
434
	return 0;
}

static ssize_t store_cursor(struct class_device *class_device,
			    const char * buf, size_t count)
{
435
//	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
436
437
438
439
440
	return 0;
}

static ssize_t show_cursor(struct class_device *class_device, char *buf)
{
441
//	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
442
443
444
445
446
447
	return 0;
}

static ssize_t store_pan(struct class_device *class_device, const char * buf,
			 size_t count)
{
448
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
	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);

	acquire_console_sem();
	err = fb_pan_display(fb_info, &var);
	release_console_sem();

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

static ssize_t show_pan(struct class_device *class_device, char *buf)
{
471
	struct fb_info *fb_info = class_get_devdata(class_device);
Linus Torvalds's avatar
Linus Torvalds committed
472
473
474
475
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
			fb_info->var.xoffset);
}

476
477
static ssize_t show_name(struct class_device *class_device, char *buf)
{
478
	struct fb_info *fb_info = class_get_devdata(class_device);
479
480
481
482

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

483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
static ssize_t store_fbstate(struct class_device *class_device,
			const char *buf, size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	u32 state;
	char *last = NULL;

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

	acquire_console_sem();
	fb_set_suspend(fb_info, (int)state);
	release_console_sem();

	return count;
}

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

Adrian Bunk's avatar
Adrian Bunk committed
505
static struct class_device_attribute class_device_attrs[] = {
Linus Torvalds's avatar
Linus Torvalds committed
506
507
508
509
510
511
512
513
514
	__ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
	__ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
	__ATTR(color_map, S_IRUGO|S_IWUSR, show_cmap, store_cmap),
	__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),
515
	__ATTR(name, S_IRUGO, show_name, NULL),
516
	__ATTR(stride, S_IRUGO, show_stride, NULL),
517
518
519
	__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
	__ATTR(con_rotate, S_IRUGO|S_IWUSR, show_con_rotate, store_con_rotate),
	__ATTR(con_rotate_all, S_IWUSR, NULL, store_con_rotate_all),
520
	__ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
Linus Torvalds's avatar
Linus Torvalds committed
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
};

int fb_init_class_device(struct fb_info *fb_info)
{
	unsigned int i;
	class_set_devdata(fb_info->class_device, fb_info);

	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
		class_device_create_file(fb_info->class_device,
					 &class_device_attrs[i]);
	return 0;
}

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

	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
		class_device_remove_file(fb_info->class_device,
					 &class_device_attrs[i]);
}