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1 | /* |
2 | * fbsysfs.c - framebuffer device class and attributes |
3 | * |
4 | * Copyright (c) 2004 James Simmons <jsimmons@infradead.org> |
5 | * |
6 | * This program is free software you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License |
8 | * as published by the Free Software Foundation; either version |
9 | * 2 of the License, or (at your option) any later version. |
10 | */ |
11 | |
12 | /* |
13 | * Note: currently there's only stubs for framebuffer_alloc and |
14 | * framebuffer_release here. The reson for that is that until all drivers |
15 | * are converted to use it a sysfsification will open OOPSable races. |
16 | */ |
17 | |
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 | * framebuffer_alloc - creates a new frame buffer info structure |
28 | * |
29 | * @size: size of driver private data, can be zero |
30 | * @dev: pointer to the device for this fb, this can be NULL |
31 | * |
32 | * Creates a new frame buffer info structure. Also reserves @size bytes |
33 | * for driver private data (info->par). info->par (if any) will be |
34 | * aligned to sizeof(long). |
35 | * |
36 | * Returns the new structure, or NULL if an error occured. |
37 | * |
38 | */ |
39 | struct 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 | } |
70 | EXPORT_SYMBOL(framebuffer_alloc); |
71 | |
72 | /** |
73 | * framebuffer_release - marks the structure available for freeing |
74 | * |
75 | * @info: frame buffer info structure |
76 | * |
77 | * Drop the reference count of the device embedded in the |
78 | * framebuffer info structure. |
79 | * |
80 | */ |
81 | void framebuffer_release(struct fb_info *info) |
82 | { |
83 | kfree(info); |
84 | } |
85 | EXPORT_SYMBOL(framebuffer_release); |
86 | |
87 | static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var) |
88 | { |
89 | int err; |
90 | |
91 | var->activate |= FB_ACTIVATE_FORCE; |
92 | acquire_console_sem(); |
93 | fb_info->flags |= FBINFO_MISC_USEREVENT; |
94 | err = fb_set_var(fb_info, var); |
95 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; |
96 | release_console_sem(); |
97 | if (err) |
98 | return err; |
99 | return 0; |
100 | } |
101 | |
102 | static int mode_string(char *buf, unsigned int offset, |
103 | const struct fb_videomode *mode) |
104 | { |
105 | char m = 'U'; |
106 | char v = 'p'; |
107 | |
108 | if (mode->flag & FB_MODE_IS_DETAILED) |
109 | m = 'D'; |
110 | if (mode->flag & FB_MODE_IS_VESA) |
111 | m = 'V'; |
112 | if (mode->flag & FB_MODE_IS_STANDARD) |
113 | m = 'S'; |
114 | |
115 | if (mode->vmode & FB_VMODE_INTERLACED) |
116 | v = 'i'; |
117 | if (mode->vmode & FB_VMODE_DOUBLE) |
118 | v = 'd'; |
119 | |
120 | return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n", |
121 | m, mode->xres, mode->yres, v, mode->refresh); |
122 | } |
123 | |
124 | static ssize_t store_mode(struct device *device, struct device_attribute *attr, |
125 | const char *buf, size_t count) |
126 | { |
127 | struct fb_info *fb_info = dev_get_drvdata(device); |
128 | char mstr[100]; |
129 | struct fb_var_screeninfo var; |
130 | struct fb_modelist *modelist; |
131 | struct fb_videomode *mode; |
132 | struct list_head *pos; |
133 | size_t i; |
134 | int err; |
135 | |
136 | memset(&var, 0, sizeof(var)); |
137 | |
138 | list_for_each(pos, &fb_info->modelist) { |
139 | modelist = list_entry(pos, struct fb_modelist, list); |
140 | mode = &modelist->mode; |
141 | i = mode_string(mstr, 0, mode); |
142 | if (strncmp(mstr, buf, max(count, i)) == 0) { |
143 | |
144 | var = fb_info->var; |
145 | fb_videomode_to_var(&var, mode); |
146 | if ((err = activate(fb_info, &var))) |
147 | return err; |
148 | fb_info->mode = mode; |
149 | return count; |
150 | } |
151 | } |
152 | return -EINVAL; |
153 | } |
154 | |
155 | static ssize_t show_mode(struct device *device, struct device_attribute *attr, |
156 | char *buf) |
157 | { |
158 | struct fb_info *fb_info = dev_get_drvdata(device); |
159 | |
160 | if (!fb_info->mode) |
161 | return 0; |
162 | |
163 | return mode_string(buf, 0, fb_info->mode); |
164 | } |
165 | |
166 | static ssize_t store_modes(struct device *device, |
167 | struct device_attribute *attr, |
168 | const char *buf, size_t count) |
169 | { |
170 | struct fb_info *fb_info = dev_get_drvdata(device); |
171 | LIST_HEAD(old_list); |
172 | int i = count / sizeof(struct fb_videomode); |
173 | |
174 | if (i * sizeof(struct fb_videomode) != count) |
175 | return -EINVAL; |
176 | |
177 | acquire_console_sem(); |
178 | list_splice(&fb_info->modelist, &old_list); |
179 | fb_videomode_to_modelist((const struct fb_videomode *)buf, i, |
180 | &fb_info->modelist); |
181 | if (fb_new_modelist(fb_info)) { |
182 | fb_destroy_modelist(&fb_info->modelist); |
183 | list_splice(&old_list, &fb_info->modelist); |
184 | } else |
185 | fb_destroy_modelist(&old_list); |
186 | |
187 | release_console_sem(); |
188 | |
189 | return 0; |
190 | } |
191 | |
192 | static ssize_t show_modes(struct device *device, struct device_attribute *attr, |
193 | char *buf) |
194 | { |
195 | struct fb_info *fb_info = dev_get_drvdata(device); |
196 | unsigned int i; |
197 | struct list_head *pos; |
198 | struct fb_modelist *modelist; |
199 | const struct fb_videomode *mode; |
200 | |
201 | i = 0; |
202 | list_for_each(pos, &fb_info->modelist) { |
203 | modelist = list_entry(pos, struct fb_modelist, list); |
204 | mode = &modelist->mode; |
205 | i += mode_string(buf, i, mode); |
206 | } |
207 | return i; |
208 | } |
209 | |
210 | static ssize_t store_bpp(struct device *device, struct device_attribute *attr, |
211 | const char *buf, size_t count) |
212 | { |
213 | struct fb_info *fb_info = dev_get_drvdata(device); |
214 | struct fb_var_screeninfo var; |
215 | char ** last = NULL; |
216 | int err; |
217 | |
218 | var = fb_info->var; |
219 | var.bits_per_pixel = simple_strtoul(buf, last, 0); |
220 | if ((err = activate(fb_info, &var))) |
221 | return err; |
222 | return count; |
223 | } |
224 | |
225 | static ssize_t show_bpp(struct device *device, struct device_attribute *attr, |
226 | char *buf) |
227 | { |
228 | struct fb_info *fb_info = dev_get_drvdata(device); |
229 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel); |
230 | } |
231 | |
232 | static ssize_t store_rotate(struct device *device, |
233 | struct device_attribute *attr, |
234 | const char *buf, size_t count) |
235 | { |
236 | struct fb_info *fb_info = dev_get_drvdata(device); |
237 | struct fb_var_screeninfo var; |
238 | char **last = NULL; |
239 | int err; |
240 | |
241 | var = fb_info->var; |
242 | var.rotate = simple_strtoul(buf, last, 0); |
243 | |
244 | if ((err = activate(fb_info, &var))) |
245 | return err; |
246 | |
247 | return count; |
248 | } |
249 | |
250 | |
251 | static ssize_t show_rotate(struct device *device, |
252 | struct device_attribute *attr, char *buf) |
253 | { |
254 | struct fb_info *fb_info = dev_get_drvdata(device); |
255 | |
256 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate); |
257 | } |
258 | |
259 | static ssize_t store_virtual(struct device *device, |
260 | struct device_attribute *attr, |
261 | const char *buf, size_t count) |
262 | { |
263 | struct fb_info *fb_info = dev_get_drvdata(device); |
264 | struct fb_var_screeninfo var; |
265 | char *last = NULL; |
266 | int err; |
267 | |
268 | var = fb_info->var; |
269 | var.xres_virtual = simple_strtoul(buf, &last, 0); |
270 | last++; |
271 | if (last - buf >= count) |
272 | return -EINVAL; |
273 | var.yres_virtual = simple_strtoul(last, &last, 0); |
274 | |
275 | if ((err = activate(fb_info, &var))) |
276 | return err; |
277 | return count; |
278 | } |
279 | |
280 | static ssize_t show_virtual(struct device *device, |
281 | struct device_attribute *attr, char *buf) |
282 | { |
283 | struct fb_info *fb_info = dev_get_drvdata(device); |
284 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, |
285 | fb_info->var.yres_virtual); |
286 | } |
287 | |
288 | static ssize_t show_stride(struct device *device, |
289 | struct device_attribute *attr, char *buf) |
290 | { |
291 | struct fb_info *fb_info = dev_get_drvdata(device); |
292 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length); |
293 | } |
294 | |
295 | static ssize_t store_blank(struct device *device, |
296 | struct device_attribute *attr, |
297 | const char *buf, size_t count) |
298 | { |
299 | struct fb_info *fb_info = dev_get_drvdata(device); |
300 | char *last = NULL; |
301 | int err; |
302 | |
303 | acquire_console_sem(); |
304 | fb_info->flags |= FBINFO_MISC_USEREVENT; |
305 | err = fb_blank(fb_info, simple_strtoul(buf, &last, 0)); |
306 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; |
307 | release_console_sem(); |
308 | if (err < 0) |
309 | return err; |
310 | return count; |
311 | } |
312 | |
313 | static ssize_t show_blank(struct device *device, |
314 | struct device_attribute *attr, char *buf) |
315 | { |
316 | // struct fb_info *fb_info = dev_get_drvdata(device); |
317 | return 0; |
318 | } |
319 | |
320 | static ssize_t store_console(struct device *device, |
321 | struct device_attribute *attr, |
322 | const char *buf, size_t count) |
323 | { |
324 | // struct fb_info *fb_info = dev_get_drvdata(device); |
325 | return 0; |
326 | } |
327 | |
328 | static ssize_t show_console(struct device *device, |
329 | struct device_attribute *attr, char *buf) |
330 | { |
331 | // struct fb_info *fb_info = dev_get_drvdata(device); |
332 | return 0; |
333 | } |
334 | |
335 | static ssize_t store_cursor(struct device *device, |
336 | struct device_attribute *attr, |
337 | const char *buf, size_t count) |
338 | { |
339 | // struct fb_info *fb_info = dev_get_drvdata(device); |
340 | return 0; |
341 | } |
342 | |
343 | static ssize_t show_cursor(struct device *device, |
344 | struct device_attribute *attr, char *buf) |
345 | { |
346 | // struct fb_info *fb_info = dev_get_drvdata(device); |
347 | return 0; |
348 | } |
349 | |
350 | static ssize_t store_pan(struct device *device, |
351 | struct device_attribute *attr, |
352 | const char *buf, size_t count) |
353 | { |
354 | struct fb_info *fb_info = dev_get_drvdata(device); |
355 | struct fb_var_screeninfo var; |
356 | char *last = NULL; |
357 | int err; |
358 | |
359 | var = fb_info->var; |
360 | var.xoffset = simple_strtoul(buf, &last, 0); |
361 | last++; |
362 | if (last - buf >= count) |
363 | return -EINVAL; |
364 | var.yoffset = simple_strtoul(last, &last, 0); |
365 | |
366 | acquire_console_sem(); |
367 | err = fb_pan_display(fb_info, &var); |
368 | release_console_sem(); |
369 | |
370 | if (err < 0) |
371 | return err; |
372 | return count; |
373 | } |
374 | |
375 | static ssize_t show_pan(struct device *device, |
376 | struct device_attribute *attr, char *buf) |
377 | { |
378 | struct fb_info *fb_info = dev_get_drvdata(device); |
379 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, |
380 | fb_info->var.yoffset); |
381 | } |
382 | |
383 | static ssize_t show_name(struct device *device, |
384 | struct device_attribute *attr, char *buf) |
385 | { |
386 | struct fb_info *fb_info = dev_get_drvdata(device); |
387 | |
388 | return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id); |
389 | } |
390 | |
391 | static ssize_t store_fbstate(struct device *device, |
392 | struct device_attribute *attr, |
393 | const char *buf, size_t count) |
394 | { |
395 | struct fb_info *fb_info = dev_get_drvdata(device); |
396 | u32 state; |
397 | char *last = NULL; |
398 | |
399 | state = simple_strtoul(buf, &last, 0); |
400 | |
401 | acquire_console_sem(); |
402 | fb_set_suspend(fb_info, (int)state); |
403 | release_console_sem(); |
404 | |
405 | return count; |
406 | } |
407 | |
408 | static ssize_t show_fbstate(struct device *device, |
409 | struct device_attribute *attr, char *buf) |
410 | { |
411 | struct fb_info *fb_info = dev_get_drvdata(device); |
412 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state); |
413 | } |
414 | |
415 | #ifdef CONFIG_FB_BACKLIGHT |
416 | static ssize_t store_bl_curve(struct device *device, |
417 | struct device_attribute *attr, |
418 | const char *buf, size_t count) |
419 | { |
420 | struct fb_info *fb_info = dev_get_drvdata(device); |
421 | u8 tmp_curve[FB_BACKLIGHT_LEVELS]; |
422 | unsigned int i; |
423 | |
424 | /* Some drivers don't use framebuffer_alloc(), but those also |
425 | * don't have backlights. |
426 | */ |
427 | if (!fb_info || !fb_info->bl_dev) |
428 | return -ENODEV; |
429 | |
430 | if (count != (FB_BACKLIGHT_LEVELS / 8 * 24)) |
431 | return -EINVAL; |
432 | |
433 | for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i) |
434 | if (sscanf(&buf[i * 24], |
435 | "%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n", |
436 | &tmp_curve[i * 8 + 0], |
437 | &tmp_curve[i * 8 + 1], |
438 | &tmp_curve[i * 8 + 2], |
439 | &tmp_curve[i * 8 + 3], |
440 | &tmp_curve[i * 8 + 4], |
441 | &tmp_curve[i * 8 + 5], |
442 | &tmp_curve[i * 8 + 6], |
443 | &tmp_curve[i * 8 + 7]) != 8) |
444 | return -EINVAL; |
445 | |
446 | /* If there has been an error in the input data, we won't |
447 | * reach this loop. |
448 | */ |
449 | mutex_lock(&fb_info->bl_curve_mutex); |
450 | for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i) |
451 | fb_info->bl_curve[i] = tmp_curve[i]; |
452 | mutex_unlock(&fb_info->bl_curve_mutex); |
453 | |
454 | return count; |
455 | } |
456 | |
457 | static ssize_t show_bl_curve(struct device *device, |
458 | struct device_attribute *attr, char *buf) |
459 | { |
460 | struct fb_info *fb_info = dev_get_drvdata(device); |
461 | ssize_t len = 0; |
462 | unsigned int i; |
463 | |
464 | /* Some drivers don't use framebuffer_alloc(), but those also |
465 | * don't have backlights. |
466 | */ |
467 | if (!fb_info || !fb_info->bl_dev) |
468 | return -ENODEV; |
469 | |
470 | mutex_lock(&fb_info->bl_curve_mutex); |
471 | for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8) |
472 | len += snprintf(&buf[len], PAGE_SIZE, |
473 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", |
474 | fb_info->bl_curve[i + 0], |
475 | fb_info->bl_curve[i + 1], |
476 | fb_info->bl_curve[i + 2], |
477 | fb_info->bl_curve[i + 3], |
478 | fb_info->bl_curve[i + 4], |
479 | fb_info->bl_curve[i + 5], |
480 | fb_info->bl_curve[i + 6], |
481 | fb_info->bl_curve[i + 7]); |
482 | mutex_unlock(&fb_info->bl_curve_mutex); |
483 | |
484 | return len; |
485 | } |
486 | #endif |
487 | |
488 | /* When cmap is added back in it should be a binary attribute |
489 | * not a text one. Consideration should also be given to converting |
490 | * fbdev to use configfs instead of sysfs */ |
491 | static struct device_attribute device_attrs[] = { |
492 | __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp), |
493 | __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank), |
494 | __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console), |
495 | __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor), |
496 | __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode), |
497 | __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes), |
498 | __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan), |
499 | __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual), |
500 | __ATTR(name, S_IRUGO, show_name, NULL), |
501 | __ATTR(stride, S_IRUGO, show_stride, NULL), |
502 | __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate), |
503 | __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate), |
504 | #ifdef CONFIG_FB_BACKLIGHT |
505 | __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve), |
506 | #endif |
507 | }; |
508 | |
509 | int fb_init_device(struct fb_info *fb_info) |
510 | { |
511 | int i, error = 0; |
512 | |
513 | dev_set_drvdata(fb_info->dev, fb_info); |
514 | |
515 | fb_info->class_flag |= FB_SYSFS_FLAG_ATTR; |
516 | |
517 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { |
518 | error = device_create_file(fb_info->dev, &device_attrs[i]); |
519 | |
520 | if (error) |
521 | break; |
522 | } |
523 | |
524 | if (error) { |
525 | while (--i >= 0) |
526 | device_remove_file(fb_info->dev, &device_attrs[i]); |
527 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; |
528 | } |
529 | |
530 | return 0; |
531 | } |
532 | |
533 | void fb_cleanup_device(struct fb_info *fb_info) |
534 | { |
535 | unsigned int i; |
536 | |
537 | if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) { |
538 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) |
539 | device_remove_file(fb_info->dev, &device_attrs[i]); |
540 | |
541 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; |
542 | } |
543 | } |
544 | |
545 | #ifdef CONFIG_FB_BACKLIGHT |
546 | /* This function generates a linear backlight curve |
547 | * |
548 | * 0: off |
549 | * 1-7: min |
550 | * 8-127: linear from min to max |
551 | */ |
552 | void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max) |
553 | { |
554 | unsigned int i, flat, count, range = (max - min); |
555 | |
556 | mutex_lock(&fb_info->bl_curve_mutex); |
557 | |
558 | fb_info->bl_curve[0] = off; |
559 | |
560 | for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat) |
561 | fb_info->bl_curve[flat] = min; |
562 | |
563 | count = FB_BACKLIGHT_LEVELS * 15 / 16; |
564 | for (i = 0; i < count; ++i) |
565 | fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count); |
566 | |
567 | mutex_unlock(&fb_info->bl_curve_mutex); |
568 | } |
569 | EXPORT_SYMBOL_GPL(fb_bl_default_curve); |
570 | #endif |
571 |
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