Commit | Line | Data |
---|---|---|
1da177e4 LT |
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/fb.h> | |
20 | #include <linux/console.h> | |
5474c120 | 21 | #include <linux/module.h> |
1da177e4 LT |
22 | |
23 | /** | |
24 | * framebuffer_alloc - creates a new frame buffer info structure | |
25 | * | |
26 | * @size: size of driver private data, can be zero | |
27 | * @dev: pointer to the device for this fb, this can be NULL | |
28 | * | |
29 | * Creates a new frame buffer info structure. Also reserves @size bytes | |
30 | * for driver private data (info->par). info->par (if any) will be | |
31 | * aligned to sizeof(long). | |
32 | * | |
33 | * Returns the new structure, or NULL if an error occured. | |
34 | * | |
35 | */ | |
36 | struct fb_info *framebuffer_alloc(size_t size, struct device *dev) | |
37 | { | |
38 | #define BYTES_PER_LONG (BITS_PER_LONG/8) | |
39 | #define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG)) | |
40 | int fb_info_size = sizeof(struct fb_info); | |
41 | struct fb_info *info; | |
42 | char *p; | |
43 | ||
44 | if (size) | |
45 | fb_info_size += PADDING; | |
46 | ||
def1eded AD |
47 | p = kzalloc(fb_info_size + size, GFP_KERNEL); |
48 | ||
1da177e4 LT |
49 | if (!p) |
50 | return NULL; | |
def1eded | 51 | |
1da177e4 LT |
52 | info = (struct fb_info *) p; |
53 | ||
54 | if (size) | |
55 | info->par = p + fb_info_size; | |
56 | ||
57 | info->device = dev; | |
58 | ||
5474c120 MH |
59 | #ifdef CONFIG_FB_BACKLIGHT |
60 | mutex_init(&info->bl_mutex); | |
61 | #endif | |
62 | ||
1da177e4 LT |
63 | return info; |
64 | #undef PADDING | |
65 | #undef BYTES_PER_LONG | |
66 | } | |
67 | EXPORT_SYMBOL(framebuffer_alloc); | |
68 | ||
69 | /** | |
70 | * framebuffer_release - marks the structure available for freeing | |
71 | * | |
72 | * @info: frame buffer info structure | |
73 | * | |
74 | * Drop the reference count of the class_device embedded in the | |
75 | * framebuffer info structure. | |
76 | * | |
77 | */ | |
78 | void framebuffer_release(struct fb_info *info) | |
79 | { | |
80 | kfree(info); | |
81 | } | |
82 | EXPORT_SYMBOL(framebuffer_release); | |
83 | ||
84 | static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var) | |
85 | { | |
86 | int err; | |
87 | ||
88 | var->activate |= FB_ACTIVATE_FORCE; | |
89 | acquire_console_sem(); | |
90 | fb_info->flags |= FBINFO_MISC_USEREVENT; | |
91 | err = fb_set_var(fb_info, var); | |
92 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
93 | release_console_sem(); | |
94 | if (err) | |
95 | return err; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static int mode_string(char *buf, unsigned int offset, | |
100 | const struct fb_videomode *mode) | |
101 | { | |
102 | char m = 'U'; | |
9dac73a4 DT |
103 | char v = 'p'; |
104 | ||
1da177e4 LT |
105 | if (mode->flag & FB_MODE_IS_DETAILED) |
106 | m = 'D'; | |
107 | if (mode->flag & FB_MODE_IS_VESA) | |
108 | m = 'V'; | |
109 | if (mode->flag & FB_MODE_IS_STANDARD) | |
110 | m = 'S'; | |
9dac73a4 DT |
111 | |
112 | if (mode->vmode & FB_VMODE_INTERLACED) | |
113 | v = 'i'; | |
114 | if (mode->vmode & FB_VMODE_DOUBLE) | |
115 | v = 'd'; | |
116 | ||
117 | return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n", | |
118 | m, mode->xres, mode->yres, v, mode->refresh); | |
1da177e4 LT |
119 | } |
120 | ||
121 | static ssize_t store_mode(struct class_device *class_device, const char * buf, | |
122 | size_t count) | |
123 | { | |
313e58ab | 124 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
125 | char mstr[100]; |
126 | struct fb_var_screeninfo var; | |
127 | struct fb_modelist *modelist; | |
128 | struct fb_videomode *mode; | |
129 | struct list_head *pos; | |
130 | size_t i; | |
131 | int err; | |
132 | ||
133 | memset(&var, 0, sizeof(var)); | |
134 | ||
135 | list_for_each(pos, &fb_info->modelist) { | |
136 | modelist = list_entry(pos, struct fb_modelist, list); | |
137 | mode = &modelist->mode; | |
138 | i = mode_string(mstr, 0, mode); | |
139 | if (strncmp(mstr, buf, max(count, i)) == 0) { | |
140 | ||
141 | var = fb_info->var; | |
142 | fb_videomode_to_var(&var, mode); | |
143 | if ((err = activate(fb_info, &var))) | |
144 | return err; | |
145 | fb_info->mode = mode; | |
146 | return count; | |
147 | } | |
148 | } | |
149 | return -EINVAL; | |
150 | } | |
151 | ||
152 | static ssize_t show_mode(struct class_device *class_device, char *buf) | |
153 | { | |
313e58ab | 154 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
155 | |
156 | if (!fb_info->mode) | |
157 | return 0; | |
158 | ||
159 | return mode_string(buf, 0, fb_info->mode); | |
160 | } | |
161 | ||
162 | static ssize_t store_modes(struct class_device *class_device, const char * buf, | |
163 | size_t count) | |
164 | { | |
313e58ab | 165 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
166 | LIST_HEAD(old_list); |
167 | int i = count / sizeof(struct fb_videomode); | |
168 | ||
169 | if (i * sizeof(struct fb_videomode) != count) | |
170 | return -EINVAL; | |
171 | ||
172 | acquire_console_sem(); | |
173 | list_splice(&fb_info->modelist, &old_list); | |
174 | fb_videomode_to_modelist((struct fb_videomode *)buf, i, | |
175 | &fb_info->modelist); | |
176 | if (fb_new_modelist(fb_info)) { | |
177 | fb_destroy_modelist(&fb_info->modelist); | |
178 | list_splice(&old_list, &fb_info->modelist); | |
179 | } else | |
180 | fb_destroy_modelist(&old_list); | |
181 | ||
182 | release_console_sem(); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static ssize_t show_modes(struct class_device *class_device, char *buf) | |
188 | { | |
313e58ab | 189 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
190 | unsigned int i; |
191 | struct list_head *pos; | |
192 | struct fb_modelist *modelist; | |
193 | const struct fb_videomode *mode; | |
194 | ||
195 | i = 0; | |
196 | list_for_each(pos, &fb_info->modelist) { | |
197 | modelist = list_entry(pos, struct fb_modelist, list); | |
198 | mode = &modelist->mode; | |
199 | i += mode_string(buf, i, mode); | |
200 | } | |
201 | return i; | |
202 | } | |
203 | ||
204 | static ssize_t store_bpp(struct class_device *class_device, const char * buf, | |
205 | size_t count) | |
206 | { | |
313e58ab | 207 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
208 | struct fb_var_screeninfo var; |
209 | char ** last = NULL; | |
210 | int err; | |
211 | ||
212 | var = fb_info->var; | |
213 | var.bits_per_pixel = simple_strtoul(buf, last, 0); | |
214 | if ((err = activate(fb_info, &var))) | |
215 | return err; | |
216 | return count; | |
217 | } | |
218 | ||
219 | static ssize_t show_bpp(struct class_device *class_device, char *buf) | |
220 | { | |
313e58ab | 221 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
222 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel); |
223 | } | |
224 | ||
a812c94b AD |
225 | static ssize_t store_rotate(struct class_device *class_device, const char *buf, |
226 | size_t count) | |
227 | { | |
228 | struct fb_info *fb_info = class_get_devdata(class_device); | |
229 | struct fb_var_screeninfo var; | |
230 | char **last = NULL; | |
231 | int err; | |
232 | ||
233 | var = fb_info->var; | |
234 | var.rotate = simple_strtoul(buf, last, 0); | |
235 | ||
236 | if ((err = activate(fb_info, &var))) | |
237 | return err; | |
238 | ||
239 | return count; | |
240 | } | |
241 | ||
242 | ||
243 | static ssize_t show_rotate(struct class_device *class_device, char *buf) | |
244 | { | |
245 | struct fb_info *fb_info = class_get_devdata(class_device); | |
246 | ||
247 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate); | |
248 | } | |
249 | ||
1da177e4 LT |
250 | static ssize_t store_virtual(struct class_device *class_device, |
251 | const char * buf, size_t count) | |
252 | { | |
313e58ab | 253 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
254 | struct fb_var_screeninfo var; |
255 | char *last = NULL; | |
256 | int err; | |
257 | ||
258 | var = fb_info->var; | |
259 | var.xres_virtual = simple_strtoul(buf, &last, 0); | |
260 | last++; | |
261 | if (last - buf >= count) | |
262 | return -EINVAL; | |
263 | var.yres_virtual = simple_strtoul(last, &last, 0); | |
1da177e4 LT |
264 | |
265 | if ((err = activate(fb_info, &var))) | |
266 | return err; | |
267 | return count; | |
268 | } | |
269 | ||
270 | static ssize_t show_virtual(struct class_device *class_device, char *buf) | |
271 | { | |
313e58ab | 272 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 | 273 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, |
e2c16499 | 274 | fb_info->var.yres_virtual); |
1da177e4 LT |
275 | } |
276 | ||
c14e2cfc JS |
277 | static ssize_t show_stride(struct class_device *class_device, char *buf) |
278 | { | |
313e58ab | 279 | struct fb_info *fb_info = class_get_devdata(class_device); |
c14e2cfc JS |
280 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length); |
281 | } | |
282 | ||
1da177e4 LT |
283 | static ssize_t store_blank(struct class_device *class_device, const char * buf, |
284 | size_t count) | |
285 | { | |
313e58ab | 286 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
287 | char *last = NULL; |
288 | int err; | |
289 | ||
290 | acquire_console_sem(); | |
291 | fb_info->flags |= FBINFO_MISC_USEREVENT; | |
292 | err = fb_blank(fb_info, simple_strtoul(buf, &last, 0)); | |
293 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
294 | release_console_sem(); | |
295 | if (err < 0) | |
296 | return err; | |
297 | return count; | |
298 | } | |
299 | ||
300 | static ssize_t show_blank(struct class_device *class_device, char *buf) | |
301 | { | |
313e58ab | 302 | // struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
303 | return 0; |
304 | } | |
305 | ||
306 | static ssize_t store_console(struct class_device *class_device, | |
307 | const char * buf, size_t count) | |
308 | { | |
313e58ab | 309 | // struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
310 | return 0; |
311 | } | |
312 | ||
313 | static ssize_t show_console(struct class_device *class_device, char *buf) | |
314 | { | |
313e58ab | 315 | // struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
316 | return 0; |
317 | } | |
318 | ||
319 | static ssize_t store_cursor(struct class_device *class_device, | |
320 | const char * buf, size_t count) | |
321 | { | |
313e58ab | 322 | // struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
323 | return 0; |
324 | } | |
325 | ||
326 | static ssize_t show_cursor(struct class_device *class_device, char *buf) | |
327 | { | |
313e58ab | 328 | // struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
329 | return 0; |
330 | } | |
331 | ||
332 | static ssize_t store_pan(struct class_device *class_device, const char * buf, | |
333 | size_t count) | |
334 | { | |
313e58ab | 335 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
336 | struct fb_var_screeninfo var; |
337 | char *last = NULL; | |
338 | int err; | |
339 | ||
340 | var = fb_info->var; | |
341 | var.xoffset = simple_strtoul(buf, &last, 0); | |
342 | last++; | |
343 | if (last - buf >= count) | |
344 | return -EINVAL; | |
345 | var.yoffset = simple_strtoul(last, &last, 0); | |
346 | ||
347 | acquire_console_sem(); | |
348 | err = fb_pan_display(fb_info, &var); | |
349 | release_console_sem(); | |
350 | ||
351 | if (err < 0) | |
352 | return err; | |
353 | return count; | |
354 | } | |
355 | ||
356 | static ssize_t show_pan(struct class_device *class_device, char *buf) | |
357 | { | |
313e58ab | 358 | struct fb_info *fb_info = class_get_devdata(class_device); |
1da177e4 LT |
359 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, |
360 | fb_info->var.xoffset); | |
361 | } | |
362 | ||
02459eaa JS |
363 | static ssize_t show_name(struct class_device *class_device, char *buf) |
364 | { | |
313e58ab | 365 | struct fb_info *fb_info = class_get_devdata(class_device); |
02459eaa JS |
366 | |
367 | return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id); | |
368 | } | |
369 | ||
30420f8f MG |
370 | static ssize_t store_fbstate(struct class_device *class_device, |
371 | const char *buf, size_t count) | |
372 | { | |
373 | struct fb_info *fb_info = class_get_devdata(class_device); | |
374 | u32 state; | |
375 | char *last = NULL; | |
376 | ||
377 | state = simple_strtoul(buf, &last, 0); | |
378 | ||
379 | acquire_console_sem(); | |
380 | fb_set_suspend(fb_info, (int)state); | |
381 | release_console_sem(); | |
382 | ||
383 | return count; | |
384 | } | |
385 | ||
386 | static ssize_t show_fbstate(struct class_device *class_device, char *buf) | |
387 | { | |
388 | struct fb_info *fb_info = class_get_devdata(class_device); | |
389 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state); | |
390 | } | |
391 | ||
5474c120 MH |
392 | #ifdef CONFIG_FB_BACKLIGHT |
393 | static ssize_t store_bl_curve(struct class_device *class_device, | |
394 | const char *buf, size_t count) | |
395 | { | |
396 | struct fb_info *fb_info = class_get_devdata(class_device); | |
397 | u8 tmp_curve[FB_BACKLIGHT_LEVELS]; | |
398 | unsigned int i; | |
399 | ||
25981de5 MH |
400 | /* Some drivers don't use framebuffer_alloc(), but those also |
401 | * don't have backlights. | |
402 | */ | |
403 | if (!fb_info || !fb_info->bl_dev) | |
404 | return -ENODEV; | |
405 | ||
5474c120 MH |
406 | if (count != (FB_BACKLIGHT_LEVELS / 8 * 24)) |
407 | return -EINVAL; | |
408 | ||
409 | for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i) | |
410 | if (sscanf(&buf[i * 24], | |
411 | "%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n", | |
412 | &tmp_curve[i * 8 + 0], | |
413 | &tmp_curve[i * 8 + 1], | |
414 | &tmp_curve[i * 8 + 2], | |
415 | &tmp_curve[i * 8 + 3], | |
416 | &tmp_curve[i * 8 + 4], | |
417 | &tmp_curve[i * 8 + 5], | |
418 | &tmp_curve[i * 8 + 6], | |
419 | &tmp_curve[i * 8 + 7]) != 8) | |
420 | return -EINVAL; | |
421 | ||
422 | /* If there has been an error in the input data, we won't | |
423 | * reach this loop. | |
424 | */ | |
425 | mutex_lock(&fb_info->bl_mutex); | |
426 | for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i) | |
427 | fb_info->bl_curve[i] = tmp_curve[i]; | |
428 | mutex_unlock(&fb_info->bl_mutex); | |
429 | ||
430 | return count; | |
431 | } | |
432 | ||
433 | static ssize_t show_bl_curve(struct class_device *class_device, char *buf) | |
434 | { | |
435 | struct fb_info *fb_info = class_get_devdata(class_device); | |
436 | ssize_t len = 0; | |
437 | unsigned int i; | |
438 | ||
25981de5 MH |
439 | /* Some drivers don't use framebuffer_alloc(), but those also |
440 | * don't have backlights. | |
441 | */ | |
442 | if (!fb_info || !fb_info->bl_dev) | |
443 | return -ENODEV; | |
444 | ||
5474c120 MH |
445 | mutex_lock(&fb_info->bl_mutex); |
446 | for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8) | |
447 | len += snprintf(&buf[len], PAGE_SIZE, | |
448 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
449 | fb_info->bl_curve[i + 0], | |
450 | fb_info->bl_curve[i + 1], | |
451 | fb_info->bl_curve[i + 2], | |
452 | fb_info->bl_curve[i + 3], | |
453 | fb_info->bl_curve[i + 4], | |
454 | fb_info->bl_curve[i + 5], | |
455 | fb_info->bl_curve[i + 6], | |
456 | fb_info->bl_curve[i + 7]); | |
457 | mutex_unlock(&fb_info->bl_mutex); | |
458 | ||
459 | return len; | |
460 | } | |
461 | #endif | |
462 | ||
913e7ec5 JS |
463 | /* When cmap is added back in it should be a binary attribute |
464 | * not a text one. Consideration should also be given to converting | |
465 | * fbdev to use configfs instead of sysfs */ | |
75c96f85 | 466 | static struct class_device_attribute class_device_attrs[] = { |
1da177e4 LT |
467 | __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp), |
468 | __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank), | |
1da177e4 LT |
469 | __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console), |
470 | __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor), | |
471 | __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode), | |
472 | __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes), | |
473 | __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan), | |
474 | __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual), | |
02459eaa | 475 | __ATTR(name, S_IRUGO, show_name, NULL), |
c14e2cfc | 476 | __ATTR(stride, S_IRUGO, show_stride, NULL), |
a812c94b | 477 | __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate), |
30420f8f | 478 | __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate), |
5474c120 MH |
479 | #ifdef CONFIG_FB_BACKLIGHT |
480 | __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve), | |
481 | #endif | |
1da177e4 LT |
482 | }; |
483 | ||
484 | int fb_init_class_device(struct fb_info *fb_info) | |
485 | { | |
486 | unsigned int i; | |
487 | class_set_devdata(fb_info->class_device, fb_info); | |
488 | ||
489 | for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) | |
490 | class_device_create_file(fb_info->class_device, | |
491 | &class_device_attrs[i]); | |
492 | return 0; | |
493 | } | |
494 | ||
495 | void fb_cleanup_class_device(struct fb_info *fb_info) | |
496 | { | |
497 | unsigned int i; | |
498 | ||
499 | for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) | |
500 | class_device_remove_file(fb_info->class_device, | |
501 | &class_device_attrs[i]); | |
502 | } | |
503 | ||
5474c120 MH |
504 | #ifdef CONFIG_FB_BACKLIGHT |
505 | /* This function generates a linear backlight curve | |
506 | * | |
507 | * 0: off | |
508 | * 1-7: min | |
509 | * 8-127: linear from min to max | |
510 | */ | |
511 | void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max) | |
512 | { | |
513 | unsigned int i, flat, count, range = (max - min); | |
514 | ||
515 | fb_info->bl_curve[0] = off; | |
1da177e4 | 516 | |
5474c120 MH |
517 | for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat) |
518 | fb_info->bl_curve[flat] = min; | |
519 | ||
520 | count = FB_BACKLIGHT_LEVELS * 15 / 16; | |
521 | for (i = 0; i < count; ++i) | |
522 | fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count); | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(fb_bl_default_curve); | |
525 | #endif |