aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/fbsysfs.c
blob: 63b505cce4ec084d84967a3609520de0e5a32fa8 (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
/*
 * 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;

	p = kmalloc(fb_info_size + size, GFP_KERNEL);
	if (!p)
		return NULL;
	memset(p, 0, fb_info_size + size);
	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)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_device);

	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)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_device);
	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)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_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 class_device *class_device, const char * buf,
			 size_t count)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
}

static ssize_t store_virtual(struct class_device *class_device,
			     const char * buf, size_t count)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_device);
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
			fb_info->var.yres_virtual);
}

/* Format for cmap is "%02x%c%4x%4x%4x\n" */
/* %02x entry %c transp %4x red %4x blue %4x green \n */
/* 255 rows at 16 chars equals 4096 */
/* PAGE_SIZE can be 4096 or larger */
static ssize_t store_cmap(struct class_device *class_device, const char *buf,
			  size_t count)
{
	struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
	int rc, i, start, length, transp = 0;

	if ((count > 4096) || ((count % 16) != 0) || (PAGE_SIZE < 4096))
		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);

		return rc;
	}
	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;
	}
	return 0;
}

static ssize_t show_cmap(struct class_device *class_device, char *buf)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_device);
	unsigned int i;

	if (!fb_info->cmap.red || !fb_info->cmap.blue ||
	   !fb_info->cmap.green)
		return -EINVAL;

	if (PAGE_SIZE < 4096)
		return -EINVAL;

	/* don't mess with the format, the buffer is PAGE_SIZE */
	/* 255 entries at 16 chars per line equals 4096 = PAGE_SIZE */
	for (i = 0; i < fb_info->cmap.len; i++) {
		sprintf(&buf[ i * 16], "%02x%c%4x%4x%4x\n", i + fb_info->cmap.start,
			((fb_info->cmap.transp && fb_info->cmap.transp[i]) ? '*' : ' '),
			fb_info->cmap.red[i], fb_info->cmap.blue[i],
			fb_info->cmap.green[i]);
	}
	return 4096;
}

static ssize_t store_blank(struct class_device *class_device, const char * buf,
			   size_t count)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_device);
	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)
{
//	struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
	return 0;
}

static ssize_t store_console(struct class_device *class_device,
			     const char * buf, size_t count)
{
//	struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
	return 0;
}

static ssize_t show_console(struct class_device *class_device, char *buf)
{
//	struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
	return 0;
}

static ssize_t store_cursor(struct class_device *class_device,
			    const char * buf, size_t count)
{
//	struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
	return 0;
}

static ssize_t show_cursor(struct class_device *class_device, char *buf)
{
//	struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
	return 0;
}

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

	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)
{
	struct fb_info *fb_info =
		(struct fb_info *)class_get_devdata(class_device);
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
			fb_info->var.xoffset);
}

static struct class_device_attribute class_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(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),
};

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]);
}