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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/fb.h> |
21 | #include <linux/console.h> | |
5474c120 | 22 | #include <linux/module.h> |
1da177e4 | 23 | |
1a6600be AD |
24 | #define FB_SYSFS_FLAG_ATTR 1 |
25 | ||
1da177e4 LT |
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 | * | |
25985edc | 36 | * Returns the new structure, or NULL if an error occurred. |
1da177e4 LT |
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 | ||
def1eded AD |
50 | p = kzalloc(fb_info_size + size, GFP_KERNEL); |
51 | ||
1da177e4 LT |
52 | if (!p) |
53 | return NULL; | |
def1eded | 54 | |
1da177e4 LT |
55 | info = (struct fb_info *) p; |
56 | ||
57 | if (size) | |
58 | info->par = p + fb_info_size; | |
59 | ||
60 | info->device = dev; | |
61 | ||
5474c120 | 62 | #ifdef CONFIG_FB_BACKLIGHT |
37ce69a5 | 63 | mutex_init(&info->bl_curve_mutex); |
5474c120 MH |
64 | #endif |
65 | ||
1da177e4 LT |
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 | * | |
78cde088 | 77 | * Drop the reference count of the device embedded in the |
1da177e4 LT |
78 | * framebuffer info structure. |
79 | * | |
80 | */ | |
81 | void framebuffer_release(struct fb_info *info) | |
82 | { | |
cc440114 DC |
83 | if (!info) |
84 | return; | |
1471ca9a | 85 | kfree(info->apertures); |
1da177e4 LT |
86 | kfree(info); |
87 | } | |
88 | EXPORT_SYMBOL(framebuffer_release); | |
89 | ||
90 | static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var) | |
91 | { | |
92 | int err; | |
93 | ||
94 | var->activate |= FB_ACTIVATE_FORCE; | |
ac751efa | 95 | console_lock(); |
1da177e4 LT |
96 | fb_info->flags |= FBINFO_MISC_USEREVENT; |
97 | err = fb_set_var(fb_info, var); | |
98 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
ac751efa | 99 | console_unlock(); |
1da177e4 LT |
100 | if (err) |
101 | return err; | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int mode_string(char *buf, unsigned int offset, | |
106 | const struct fb_videomode *mode) | |
107 | { | |
108 | char m = 'U'; | |
9dac73a4 DT |
109 | char v = 'p'; |
110 | ||
1da177e4 LT |
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'; | |
9dac73a4 DT |
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); | |
1da177e4 LT |
125 | } |
126 | ||
78cde088 GKH |
127 | static ssize_t store_mode(struct device *device, struct device_attribute *attr, |
128 | const char *buf, size_t count) | |
1da177e4 | 129 | { |
78cde088 | 130 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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 | ||
78cde088 GKH |
158 | static ssize_t show_mode(struct device *device, struct device_attribute *attr, |
159 | char *buf) | |
1da177e4 | 160 | { |
78cde088 | 161 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
162 | |
163 | if (!fb_info->mode) | |
164 | return 0; | |
165 | ||
166 | return mode_string(buf, 0, fb_info->mode); | |
167 | } | |
168 | ||
78cde088 GKH |
169 | static ssize_t store_modes(struct device *device, |
170 | struct device_attribute *attr, | |
171 | const char *buf, size_t count) | |
1da177e4 | 172 | { |
78cde088 | 173 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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 | ||
ac751efa | 180 | console_lock(); |
3a41c5db GZ |
181 | if (!lock_fb_info(fb_info)) { |
182 | console_unlock(); | |
183 | return -ENODEV; | |
184 | } | |
185 | ||
1da177e4 | 186 | list_splice(&fb_info->modelist, &old_list); |
9791d763 | 187 | fb_videomode_to_modelist((const struct fb_videomode *)buf, i, |
1da177e4 LT |
188 | &fb_info->modelist); |
189 | if (fb_new_modelist(fb_info)) { | |
190 | fb_destroy_modelist(&fb_info->modelist); | |
191 | list_splice(&old_list, &fb_info->modelist); | |
192 | } else | |
193 | fb_destroy_modelist(&old_list); | |
194 | ||
50e244cc | 195 | unlock_fb_info(fb_info); |
3a41c5db | 196 | console_unlock(); |
1da177e4 LT |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
78cde088 GKH |
201 | static ssize_t show_modes(struct device *device, struct device_attribute *attr, |
202 | char *buf) | |
1da177e4 | 203 | { |
78cde088 | 204 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
205 | unsigned int i; |
206 | struct list_head *pos; | |
207 | struct fb_modelist *modelist; | |
208 | const struct fb_videomode *mode; | |
209 | ||
210 | i = 0; | |
211 | list_for_each(pos, &fb_info->modelist) { | |
212 | modelist = list_entry(pos, struct fb_modelist, list); | |
213 | mode = &modelist->mode; | |
214 | i += mode_string(buf, i, mode); | |
215 | } | |
216 | return i; | |
217 | } | |
218 | ||
78cde088 GKH |
219 | static ssize_t store_bpp(struct device *device, struct device_attribute *attr, |
220 | const char *buf, size_t count) | |
1da177e4 | 221 | { |
78cde088 | 222 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
223 | struct fb_var_screeninfo var; |
224 | char ** last = NULL; | |
225 | int err; | |
226 | ||
227 | var = fb_info->var; | |
228 | var.bits_per_pixel = simple_strtoul(buf, last, 0); | |
229 | if ((err = activate(fb_info, &var))) | |
230 | return err; | |
231 | return count; | |
232 | } | |
233 | ||
78cde088 GKH |
234 | static ssize_t show_bpp(struct device *device, struct device_attribute *attr, |
235 | char *buf) | |
1da177e4 | 236 | { |
78cde088 | 237 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
238 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel); |
239 | } | |
240 | ||
78cde088 GKH |
241 | static ssize_t store_rotate(struct device *device, |
242 | struct device_attribute *attr, | |
243 | const char *buf, size_t count) | |
a812c94b | 244 | { |
78cde088 | 245 | struct fb_info *fb_info = dev_get_drvdata(device); |
a812c94b AD |
246 | struct fb_var_screeninfo var; |
247 | char **last = NULL; | |
248 | int err; | |
249 | ||
250 | var = fb_info->var; | |
251 | var.rotate = simple_strtoul(buf, last, 0); | |
252 | ||
253 | if ((err = activate(fb_info, &var))) | |
254 | return err; | |
255 | ||
256 | return count; | |
257 | } | |
258 | ||
259 | ||
78cde088 GKH |
260 | static ssize_t show_rotate(struct device *device, |
261 | struct device_attribute *attr, char *buf) | |
a812c94b | 262 | { |
78cde088 | 263 | struct fb_info *fb_info = dev_get_drvdata(device); |
a812c94b AD |
264 | |
265 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate); | |
266 | } | |
267 | ||
78cde088 GKH |
268 | static ssize_t store_virtual(struct device *device, |
269 | struct device_attribute *attr, | |
270 | const char *buf, size_t count) | |
1da177e4 | 271 | { |
78cde088 | 272 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
273 | struct fb_var_screeninfo var; |
274 | char *last = NULL; | |
275 | int err; | |
276 | ||
277 | var = fb_info->var; | |
278 | var.xres_virtual = simple_strtoul(buf, &last, 0); | |
279 | last++; | |
280 | if (last - buf >= count) | |
281 | return -EINVAL; | |
282 | var.yres_virtual = simple_strtoul(last, &last, 0); | |
1da177e4 LT |
283 | |
284 | if ((err = activate(fb_info, &var))) | |
285 | return err; | |
286 | return count; | |
287 | } | |
288 | ||
78cde088 GKH |
289 | static ssize_t show_virtual(struct device *device, |
290 | struct device_attribute *attr, char *buf) | |
1da177e4 | 291 | { |
78cde088 | 292 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 | 293 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, |
e2c16499 | 294 | fb_info->var.yres_virtual); |
1da177e4 LT |
295 | } |
296 | ||
78cde088 GKH |
297 | static ssize_t show_stride(struct device *device, |
298 | struct device_attribute *attr, char *buf) | |
c14e2cfc | 299 | { |
78cde088 | 300 | struct fb_info *fb_info = dev_get_drvdata(device); |
c14e2cfc JS |
301 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length); |
302 | } | |
303 | ||
78cde088 GKH |
304 | static ssize_t store_blank(struct device *device, |
305 | struct device_attribute *attr, | |
306 | const char *buf, size_t count) | |
1da177e4 | 307 | { |
78cde088 | 308 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
309 | char *last = NULL; |
310 | int err; | |
311 | ||
ac751efa | 312 | console_lock(); |
1da177e4 LT |
313 | fb_info->flags |= FBINFO_MISC_USEREVENT; |
314 | err = fb_blank(fb_info, simple_strtoul(buf, &last, 0)); | |
315 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
ac751efa | 316 | console_unlock(); |
1da177e4 LT |
317 | if (err < 0) |
318 | return err; | |
319 | return count; | |
320 | } | |
321 | ||
78cde088 GKH |
322 | static ssize_t show_blank(struct device *device, |
323 | struct device_attribute *attr, char *buf) | |
1da177e4 | 324 | { |
78cde088 | 325 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
326 | return 0; |
327 | } | |
328 | ||
78cde088 GKH |
329 | static ssize_t store_console(struct device *device, |
330 | struct device_attribute *attr, | |
331 | const char *buf, size_t count) | |
1da177e4 | 332 | { |
78cde088 | 333 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
334 | return 0; |
335 | } | |
336 | ||
78cde088 GKH |
337 | static ssize_t show_console(struct device *device, |
338 | struct device_attribute *attr, char *buf) | |
1da177e4 | 339 | { |
78cde088 | 340 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
341 | return 0; |
342 | } | |
343 | ||
78cde088 GKH |
344 | static ssize_t store_cursor(struct device *device, |
345 | struct device_attribute *attr, | |
346 | const char *buf, size_t count) | |
1da177e4 | 347 | { |
78cde088 | 348 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
349 | return 0; |
350 | } | |
351 | ||
78cde088 GKH |
352 | static ssize_t show_cursor(struct device *device, |
353 | struct device_attribute *attr, char *buf) | |
1da177e4 | 354 | { |
78cde088 | 355 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
356 | return 0; |
357 | } | |
358 | ||
78cde088 GKH |
359 | static ssize_t store_pan(struct device *device, |
360 | struct device_attribute *attr, | |
361 | const char *buf, size_t count) | |
1da177e4 | 362 | { |
78cde088 | 363 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
364 | struct fb_var_screeninfo var; |
365 | char *last = NULL; | |
366 | int err; | |
367 | ||
368 | var = fb_info->var; | |
369 | var.xoffset = simple_strtoul(buf, &last, 0); | |
370 | last++; | |
371 | if (last - buf >= count) | |
372 | return -EINVAL; | |
373 | var.yoffset = simple_strtoul(last, &last, 0); | |
374 | ||
ac751efa | 375 | console_lock(); |
1da177e4 | 376 | err = fb_pan_display(fb_info, &var); |
ac751efa | 377 | console_unlock(); |
1da177e4 LT |
378 | |
379 | if (err < 0) | |
380 | return err; | |
381 | return count; | |
382 | } | |
383 | ||
78cde088 GKH |
384 | static ssize_t show_pan(struct device *device, |
385 | struct device_attribute *attr, char *buf) | |
1da177e4 | 386 | { |
78cde088 | 387 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 | 388 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, |
c4270637 | 389 | fb_info->var.yoffset); |
1da177e4 LT |
390 | } |
391 | ||
78cde088 GKH |
392 | static ssize_t show_name(struct device *device, |
393 | struct device_attribute *attr, char *buf) | |
02459eaa | 394 | { |
78cde088 | 395 | struct fb_info *fb_info = dev_get_drvdata(device); |
02459eaa JS |
396 | |
397 | return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id); | |
398 | } | |
399 | ||
78cde088 GKH |
400 | static ssize_t store_fbstate(struct device *device, |
401 | struct device_attribute *attr, | |
402 | const char *buf, size_t count) | |
30420f8f | 403 | { |
78cde088 | 404 | struct fb_info *fb_info = dev_get_drvdata(device); |
30420f8f MG |
405 | u32 state; |
406 | char *last = NULL; | |
407 | ||
408 | state = simple_strtoul(buf, &last, 0); | |
409 | ||
ac751efa | 410 | console_lock(); |
3a41c5db GZ |
411 | if (!lock_fb_info(fb_info)) { |
412 | console_unlock(); | |
413 | return -ENODEV; | |
414 | } | |
415 | ||
30420f8f | 416 | fb_set_suspend(fb_info, (int)state); |
3a41c5db | 417 | |
9e769ff3 | 418 | unlock_fb_info(fb_info); |
3a41c5db | 419 | console_unlock(); |
30420f8f MG |
420 | |
421 | return count; | |
422 | } | |
423 | ||
78cde088 GKH |
424 | static ssize_t show_fbstate(struct device *device, |
425 | struct device_attribute *attr, char *buf) | |
30420f8f | 426 | { |
78cde088 | 427 | struct fb_info *fb_info = dev_get_drvdata(device); |
30420f8f MG |
428 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state); |
429 | } | |
430 | ||
5474c120 | 431 | #ifdef CONFIG_FB_BACKLIGHT |
78cde088 GKH |
432 | static ssize_t store_bl_curve(struct device *device, |
433 | struct device_attribute *attr, | |
434 | const char *buf, size_t count) | |
5474c120 | 435 | { |
78cde088 | 436 | struct fb_info *fb_info = dev_get_drvdata(device); |
5474c120 MH |
437 | u8 tmp_curve[FB_BACKLIGHT_LEVELS]; |
438 | unsigned int i; | |
439 | ||
25981de5 MH |
440 | /* Some drivers don't use framebuffer_alloc(), but those also |
441 | * don't have backlights. | |
442 | */ | |
443 | if (!fb_info || !fb_info->bl_dev) | |
444 | return -ENODEV; | |
445 | ||
5474c120 MH |
446 | if (count != (FB_BACKLIGHT_LEVELS / 8 * 24)) |
447 | return -EINVAL; | |
448 | ||
449 | for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i) | |
450 | if (sscanf(&buf[i * 24], | |
451 | "%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n", | |
452 | &tmp_curve[i * 8 + 0], | |
453 | &tmp_curve[i * 8 + 1], | |
454 | &tmp_curve[i * 8 + 2], | |
455 | &tmp_curve[i * 8 + 3], | |
456 | &tmp_curve[i * 8 + 4], | |
457 | &tmp_curve[i * 8 + 5], | |
458 | &tmp_curve[i * 8 + 6], | |
459 | &tmp_curve[i * 8 + 7]) != 8) | |
460 | return -EINVAL; | |
461 | ||
462 | /* If there has been an error in the input data, we won't | |
463 | * reach this loop. | |
464 | */ | |
37ce69a5 | 465 | mutex_lock(&fb_info->bl_curve_mutex); |
5474c120 MH |
466 | for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i) |
467 | fb_info->bl_curve[i] = tmp_curve[i]; | |
37ce69a5 | 468 | mutex_unlock(&fb_info->bl_curve_mutex); |
5474c120 MH |
469 | |
470 | return count; | |
471 | } | |
472 | ||
78cde088 GKH |
473 | static ssize_t show_bl_curve(struct device *device, |
474 | struct device_attribute *attr, char *buf) | |
5474c120 | 475 | { |
78cde088 | 476 | struct fb_info *fb_info = dev_get_drvdata(device); |
5474c120 MH |
477 | ssize_t len = 0; |
478 | unsigned int i; | |
479 | ||
25981de5 MH |
480 | /* Some drivers don't use framebuffer_alloc(), but those also |
481 | * don't have backlights. | |
482 | */ | |
483 | if (!fb_info || !fb_info->bl_dev) | |
484 | return -ENODEV; | |
485 | ||
37ce69a5 | 486 | mutex_lock(&fb_info->bl_curve_mutex); |
5474c120 MH |
487 | for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8) |
488 | len += snprintf(&buf[len], PAGE_SIZE, | |
489 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
490 | fb_info->bl_curve[i + 0], | |
491 | fb_info->bl_curve[i + 1], | |
492 | fb_info->bl_curve[i + 2], | |
493 | fb_info->bl_curve[i + 3], | |
494 | fb_info->bl_curve[i + 4], | |
495 | fb_info->bl_curve[i + 5], | |
496 | fb_info->bl_curve[i + 6], | |
497 | fb_info->bl_curve[i + 7]); | |
37ce69a5 | 498 | mutex_unlock(&fb_info->bl_curve_mutex); |
5474c120 MH |
499 | |
500 | return len; | |
501 | } | |
502 | #endif | |
503 | ||
913e7ec5 JS |
504 | /* When cmap is added back in it should be a binary attribute |
505 | * not a text one. Consideration should also be given to converting | |
506 | * fbdev to use configfs instead of sysfs */ | |
78cde088 | 507 | static struct device_attribute device_attrs[] = { |
1da177e4 LT |
508 | __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp), |
509 | __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank), | |
1da177e4 LT |
510 | __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console), |
511 | __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor), | |
512 | __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode), | |
513 | __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes), | |
514 | __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan), | |
515 | __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual), | |
02459eaa | 516 | __ATTR(name, S_IRUGO, show_name, NULL), |
c14e2cfc | 517 | __ATTR(stride, S_IRUGO, show_stride, NULL), |
a812c94b | 518 | __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate), |
30420f8f | 519 | __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate), |
5474c120 MH |
520 | #ifdef CONFIG_FB_BACKLIGHT |
521 | __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve), | |
522 | #endif | |
1da177e4 LT |
523 | }; |
524 | ||
78cde088 | 525 | int fb_init_device(struct fb_info *fb_info) |
1da177e4 | 526 | { |
1a6600be AD |
527 | int i, error = 0; |
528 | ||
78cde088 | 529 | dev_set_drvdata(fb_info->dev, fb_info); |
1da177e4 | 530 | |
1a6600be AD |
531 | fb_info->class_flag |= FB_SYSFS_FLAG_ATTR; |
532 | ||
78cde088 GKH |
533 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { |
534 | error = device_create_file(fb_info->dev, &device_attrs[i]); | |
1a6600be AD |
535 | |
536 | if (error) | |
537 | break; | |
538 | } | |
539 | ||
540 | if (error) { | |
541 | while (--i >= 0) | |
78cde088 | 542 | device_remove_file(fb_info->dev, &device_attrs[i]); |
1a6600be AD |
543 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; |
544 | } | |
545 | ||
1da177e4 LT |
546 | return 0; |
547 | } | |
548 | ||
78cde088 | 549 | void fb_cleanup_device(struct fb_info *fb_info) |
1da177e4 LT |
550 | { |
551 | unsigned int i; | |
552 | ||
1a6600be | 553 | if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) { |
78cde088 GKH |
554 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) |
555 | device_remove_file(fb_info->dev, &device_attrs[i]); | |
1a6600be AD |
556 | |
557 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; | |
558 | } | |
1da177e4 LT |
559 | } |
560 | ||
5474c120 MH |
561 | #ifdef CONFIG_FB_BACKLIGHT |
562 | /* This function generates a linear backlight curve | |
563 | * | |
564 | * 0: off | |
565 | * 1-7: min | |
566 | * 8-127: linear from min to max | |
567 | */ | |
568 | void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max) | |
569 | { | |
570 | unsigned int i, flat, count, range = (max - min); | |
571 | ||
37ce69a5 RP |
572 | mutex_lock(&fb_info->bl_curve_mutex); |
573 | ||
5474c120 | 574 | fb_info->bl_curve[0] = off; |
1da177e4 | 575 | |
5474c120 MH |
576 | for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat) |
577 | fb_info->bl_curve[flat] = min; | |
578 | ||
579 | count = FB_BACKLIGHT_LEVELS * 15 / 16; | |
580 | for (i = 0; i < count; ++i) | |
581 | fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count); | |
37ce69a5 RP |
582 | |
583 | mutex_unlock(&fb_info->bl_curve_mutex); | |
5474c120 MH |
584 | } |
585 | EXPORT_SYMBOL_GPL(fb_bl_default_curve); | |
586 | #endif |