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18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/fb.h>
21#include <linux/console.h>
22#include <linux/module.h>
23
24#define FB_SYSFS_FLAG_ATTR 1
25
26
27
28
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31
32
33
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36
37
38
39struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
40{
41#define BYTES_PER_LONG (BITS_PER_LONG/8)
42#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
43 int fb_info_size = sizeof(struct fb_info);
44 struct fb_info *info;
45 char *p;
46
47 if (size)
48 fb_info_size += PADDING;
49
50 p = kzalloc(fb_info_size + size, GFP_KERNEL);
51
52 if (!p)
53 return NULL;
54
55 info = (struct fb_info *) p;
56
57 if (size)
58 info->par = p + fb_info_size;
59
60 info->device = dev;
61
62#ifdef CONFIG_FB_BACKLIGHT
63 mutex_init(&info->bl_curve_mutex);
64#endif
65
66 return info;
67#undef PADDING
68#undef BYTES_PER_LONG
69}
70EXPORT_SYMBOL(framebuffer_alloc);
71
72
73
74
75
76
77
78
79
80
81void framebuffer_release(struct fb_info *info)
82{
83 if (!info)
84 return;
85 kfree(info->apertures);
86 kfree(info);
87}
88EXPORT_SYMBOL(framebuffer_release);
89
90static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
91{
92 int err;
93
94 var->activate |= FB_ACTIVATE_FORCE;
95 console_lock();
96 fb_info->flags |= FBINFO_MISC_USEREVENT;
97 err = fb_set_var(fb_info, var);
98 fb_info->flags &= ~FBINFO_MISC_USEREVENT;
99 console_unlock();
100 if (err)
101 return err;
102 return 0;
103}
104
105static int mode_string(char *buf, unsigned int offset,
106 const struct fb_videomode *mode)
107{
108 char m = 'U';
109 char v = 'p';
110
111 if (mode->flag & FB_MODE_IS_DETAILED)
112 m = 'D';
113 if (mode->flag & FB_MODE_IS_VESA)
114 m = 'V';
115 if (mode->flag & FB_MODE_IS_STANDARD)
116 m = 'S';
117
118 if (mode->vmode & FB_VMODE_INTERLACED)
119 v = 'i';
120 if (mode->vmode & FB_VMODE_DOUBLE)
121 v = 'd';
122
123 return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
124 m, mode->xres, mode->yres, v, mode->refresh);
125}
126
127static ssize_t store_mode(struct device *device, struct device_attribute *attr,
128 const char *buf, size_t count)
129{
130 struct fb_info *fb_info = dev_get_drvdata(device);
131 char mstr[100];
132 struct fb_var_screeninfo var;
133 struct fb_modelist *modelist;
134 struct fb_videomode *mode;
135 struct list_head *pos;
136 size_t i;
137 int err;
138
139 memset(&var, 0, sizeof(var));
140
141 list_for_each(pos, &fb_info->modelist) {
142 modelist = list_entry(pos, struct fb_modelist, list);
143 mode = &modelist->mode;
144 i = mode_string(mstr, 0, mode);
145 if (strncmp(mstr, buf, max(count, i)) == 0) {
146
147 var = fb_info->var;
148 fb_videomode_to_var(&var, mode);
149 if ((err = activate(fb_info, &var)))
150 return err;
151 fb_info->mode = mode;
152 return count;
153 }
154 }
155 return -EINVAL;
156}
157
158static ssize_t show_mode(struct device *device, struct device_attribute *attr,
159 char *buf)
160{
161 struct fb_info *fb_info = dev_get_drvdata(device);
162
163 if (!fb_info->mode)
164 return 0;
165
166 return mode_string(buf, 0, fb_info->mode);
167}
168
169static ssize_t store_modes(struct device *device,
170 struct device_attribute *attr,
171 const char *buf, size_t count)
172{
173 struct fb_info *fb_info = dev_get_drvdata(device);
174 LIST_HEAD(old_list);
175 int i = count / sizeof(struct fb_videomode);
176
177 if (i * sizeof(struct fb_videomode) != count)
178 return -EINVAL;
179
180 if (!lock_fb_info(fb_info))
181 return -ENODEV;
182 console_lock();
183 list_splice(&fb_info->modelist, &old_list);
184 fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
185 &fb_info->modelist);
186 if (fb_new_modelist(fb_info)) {
187 fb_destroy_modelist(&fb_info->modelist);
188 list_splice(&old_list, &fb_info->modelist);
189 } else
190 fb_destroy_modelist(&old_list);
191
192 console_unlock();
193 unlock_fb_info(fb_info);
194
195 return 0;
196}
197
198static ssize_t show_modes(struct device *device, struct device_attribute *attr,
199 char *buf)
200{
201 struct fb_info *fb_info = dev_get_drvdata(device);
202 unsigned int i;
203 struct list_head *pos;
204 struct fb_modelist *modelist;
205 const struct fb_videomode *mode;
206
207 i = 0;
208 list_for_each(pos, &fb_info->modelist) {
209 modelist = list_entry(pos, struct fb_modelist, list);
210 mode = &modelist->mode;
211 i += mode_string(buf, i, mode);
212 }
213 return i;
214}
215
216static ssize_t store_bpp(struct device *device, struct device_attribute *attr,
217 const char *buf, size_t count)
218{
219 struct fb_info *fb_info = dev_get_drvdata(device);
220 struct fb_var_screeninfo var;
221 char ** last = NULL;
222 int err;
223
224 var = fb_info->var;
225 var.bits_per_pixel = simple_strtoul(buf, last, 0);
226 if ((err = activate(fb_info, &var)))
227 return err;
228 return count;
229}
230
231static ssize_t show_bpp(struct device *device, struct device_attribute *attr,
232 char *buf)
233{
234 struct fb_info *fb_info = dev_get_drvdata(device);
235 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
236}
237
238static ssize_t store_rotate(struct device *device,
239 struct device_attribute *attr,
240 const char *buf, size_t count)
241{
242 struct fb_info *fb_info = dev_get_drvdata(device);
243 struct fb_var_screeninfo var;
244 char **last = NULL;
245 int err;
246
247 var = fb_info->var;
248 var.rotate = simple_strtoul(buf, last, 0);
249
250 if ((err = activate(fb_info, &var)))
251 return err;
252
253 return count;
254}
255
256
257static ssize_t show_rotate(struct device *device,
258 struct device_attribute *attr, char *buf)
259{
260 struct fb_info *fb_info = dev_get_drvdata(device);
261
262 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
263}
264
265static ssize_t store_virtual(struct device *device,
266 struct device_attribute *attr,
267 const char *buf, size_t count)
268{
269 struct fb_info *fb_info = dev_get_drvdata(device);
270 struct fb_var_screeninfo var;
271 char *last = NULL;
272 int err;
273
274 var = fb_info->var;
275 var.xres_virtual = simple_strtoul(buf, &last, 0);
276 last++;
277 if (last - buf >= count)
278 return -EINVAL;
279 var.yres_virtual = simple_strtoul(last, &last, 0);
280
281 if ((err = activate(fb_info, &var)))
282 return err;
283 return count;
284}
285
286static ssize_t show_virtual(struct device *device,
287 struct device_attribute *attr, char *buf)
288{
289 struct fb_info *fb_info = dev_get_drvdata(device);
290 return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
291 fb_info->var.yres_virtual);
292}
293
294static ssize_t show_stride(struct device *device,
295 struct device_attribute *attr, char *buf)
296{
297 struct fb_info *fb_info = dev_get_drvdata(device);
298 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
299}
300
301static ssize_t store_blank(struct device *device,
302 struct device_attribute *attr,
303 const char *buf, size_t count)
304{
305 struct fb_info *fb_info = dev_get_drvdata(device);
306 char *last = NULL;
307 int err;
308
309 console_lock();
310 fb_info->flags |= FBINFO_MISC_USEREVENT;
311 err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
312 fb_info->flags &= ~FBINFO_MISC_USEREVENT;
313 console_unlock();
314 if (err < 0)
315 return err;
316 return count;
317}
318
319static ssize_t show_blank(struct device *device,
320 struct device_attribute *attr, char *buf)
321{
322
323 return 0;
324}
325
326static ssize_t store_console(struct device *device,
327 struct device_attribute *attr,
328 const char *buf, size_t count)
329{
330
331 return 0;
332}
333
334static ssize_t show_console(struct device *device,
335 struct device_attribute *attr, char *buf)
336{
337
338 return 0;
339}
340
341static ssize_t store_cursor(struct device *device,
342 struct device_attribute *attr,
343 const char *buf, size_t count)
344{
345
346 return 0;
347}
348
349static ssize_t show_cursor(struct device *device,
350 struct device_attribute *attr, char *buf)
351{
352
353 return 0;
354}
355
356static ssize_t store_pan(struct device *device,
357 struct device_attribute *attr,
358 const char *buf, size_t count)
359{
360 struct fb_info *fb_info = dev_get_drvdata(device);
361 struct fb_var_screeninfo var;
362 char *last = NULL;
363 int err;
364
365 var = fb_info->var;
366 var.xoffset = simple_strtoul(buf, &last, 0);
367 last++;
368 if (last - buf >= count)
369 return -EINVAL;
370 var.yoffset = simple_strtoul(last, &last, 0);
371
372 console_lock();
373 err = fb_pan_display(fb_info, &var);
374 console_unlock();
375
376 if (err < 0)
377 return err;
378 return count;
379}
380
381static ssize_t show_pan(struct device *device,
382 struct device_attribute *attr, char *buf)
383{
384 struct fb_info *fb_info = dev_get_drvdata(device);
385 return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
386 fb_info->var.yoffset);
387}
388
389static ssize_t show_name(struct device *device,
390 struct device_attribute *attr, char *buf)
391{
392 struct fb_info *fb_info = dev_get_drvdata(device);
393
394 return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
395}
396
397static ssize_t store_fbstate(struct device *device,
398 struct device_attribute *attr,
399 const char *buf, size_t count)
400{
401 struct fb_info *fb_info = dev_get_drvdata(device);
402 u32 state;
403 char *last = NULL;
404
405 state = simple_strtoul(buf, &last, 0);
406
407 if (!lock_fb_info(fb_info))
408 return -ENODEV;
409 console_lock();
410 fb_set_suspend(fb_info, (int)state);
411 console_unlock();
412 unlock_fb_info(fb_info);
413
414 return count;
415}
416
417static ssize_t show_fbstate(struct device *device,
418 struct device_attribute *attr, char *buf)
419{
420 struct fb_info *fb_info = dev_get_drvdata(device);
421 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
422}
423
424#ifdef CONFIG_FB_BACKLIGHT
425static ssize_t store_bl_curve(struct device *device,
426 struct device_attribute *attr,
427 const char *buf, size_t count)
428{
429 struct fb_info *fb_info = dev_get_drvdata(device);
430 u8 tmp_curve[FB_BACKLIGHT_LEVELS];
431 unsigned int i;
432
433
434
435
436 if (!fb_info || !fb_info->bl_dev)
437 return -ENODEV;
438
439 if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
440 return -EINVAL;
441
442 for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
443 if (sscanf(&buf[i * 24],
444 "%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
445 &tmp_curve[i * 8 + 0],
446 &tmp_curve[i * 8 + 1],
447 &tmp_curve[i * 8 + 2],
448 &tmp_curve[i * 8 + 3],
449 &tmp_curve[i * 8 + 4],
450 &tmp_curve[i * 8 + 5],
451 &tmp_curve[i * 8 + 6],
452 &tmp_curve[i * 8 + 7]) != 8)
453 return -EINVAL;
454
455
456
457
458 mutex_lock(&fb_info->bl_curve_mutex);
459 for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
460 fb_info->bl_curve[i] = tmp_curve[i];
461 mutex_unlock(&fb_info->bl_curve_mutex);
462
463 return count;
464}
465
466static ssize_t show_bl_curve(struct device *device,
467 struct device_attribute *attr, char *buf)
468{
469 struct fb_info *fb_info = dev_get_drvdata(device);
470 ssize_t len = 0;
471 unsigned int i;
472
473
474
475
476 if (!fb_info || !fb_info->bl_dev)
477 return -ENODEV;
478
479 mutex_lock(&fb_info->bl_curve_mutex);
480 for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
481 len += snprintf(&buf[len], PAGE_SIZE,
482 "%02x %02x %02x %02x %02x %02x %02x %02x\n",
483 fb_info->bl_curve[i + 0],
484 fb_info->bl_curve[i + 1],
485 fb_info->bl_curve[i + 2],
486 fb_info->bl_curve[i + 3],
487 fb_info->bl_curve[i + 4],
488 fb_info->bl_curve[i + 5],
489 fb_info->bl_curve[i + 6],
490 fb_info->bl_curve[i + 7]);
491 mutex_unlock(&fb_info->bl_curve_mutex);
492
493 return len;
494}
495#endif
496
497
498
499
500static struct device_attribute device_attrs[] = {
501 __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
502 __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
503 __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console),
504 __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor),
505 __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode),
506 __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes),
507 __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan),
508 __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual),
509 __ATTR(name, S_IRUGO, show_name, NULL),
510 __ATTR(stride, S_IRUGO, show_stride, NULL),
511 __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
512 __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
513#ifdef CONFIG_FB_BACKLIGHT
514 __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve),
515#endif
516};
517
518int fb_init_device(struct fb_info *fb_info)
519{
520 int i, error = 0;
521
522 dev_set_drvdata(fb_info->dev, fb_info);
523
524 fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;
525
526 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
527 error = device_create_file(fb_info->dev, &device_attrs[i]);
528
529 if (error)
530 break;
531 }
532
533 if (error) {
534 while (--i >= 0)
535 device_remove_file(fb_info->dev, &device_attrs[i]);
536 fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
537 }
538
539 return 0;
540}
541
542void fb_cleanup_device(struct fb_info *fb_info)
543{
544 unsigned int i;
545
546 if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
547 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
548 device_remove_file(fb_info->dev, &device_attrs[i]);
549
550 fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
551 }
552}
553
554#ifdef CONFIG_FB_BACKLIGHT
555
556
557
558
559
560
561void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
562{
563 unsigned int i, flat, count, range = (max - min);
564
565 mutex_lock(&fb_info->bl_curve_mutex);
566
567 fb_info->bl_curve[0] = off;
568
569 for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
570 fb_info->bl_curve[flat] = min;
571
572 count = FB_BACKLIGHT_LEVELS * 15 / 16;
573 for (i = 0; i < count; ++i)
574 fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
575
576 mutex_unlock(&fb_info->bl_curve_mutex);
577}
578EXPORT_SYMBOL_GPL(fb_bl_default_curve);
579#endif
580