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Commit | Line | Data |
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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 | * | |
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 | ||
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 | { | |
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'; | |
9dac73a4 DT |
106 | char v = 'p'; |
107 | ||
1da177e4 LT |
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'; | |
9dac73a4 DT |
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); | |
1da177e4 LT |
122 | } |
123 | ||
78cde088 GKH |
124 | static ssize_t store_mode(struct device *device, struct device_attribute *attr, |
125 | const char *buf, size_t count) | |
1da177e4 | 126 | { |
78cde088 | 127 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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 | ||
78cde088 GKH |
155 | static ssize_t show_mode(struct device *device, struct device_attribute *attr, |
156 | char *buf) | |
1da177e4 | 157 | { |
78cde088 | 158 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
159 | |
160 | if (!fb_info->mode) | |
161 | return 0; | |
162 | ||
163 | return mode_string(buf, 0, fb_info->mode); | |
164 | } | |
165 | ||
78cde088 GKH |
166 | static ssize_t store_modes(struct device *device, |
167 | struct device_attribute *attr, | |
168 | const char *buf, size_t count) | |
1da177e4 | 169 | { |
78cde088 | 170 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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); | |
9791d763 | 179 | fb_videomode_to_modelist((const struct fb_videomode *)buf, i, |
1da177e4 LT |
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 | ||
78cde088 GKH |
192 | static ssize_t show_modes(struct device *device, struct device_attribute *attr, |
193 | char *buf) | |
1da177e4 | 194 | { |
78cde088 | 195 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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 | ||
78cde088 GKH |
210 | static ssize_t store_bpp(struct device *device, struct device_attribute *attr, |
211 | const char *buf, size_t count) | |
1da177e4 | 212 | { |
78cde088 | 213 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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 | ||
78cde088 GKH |
225 | static ssize_t show_bpp(struct device *device, struct device_attribute *attr, |
226 | char *buf) | |
1da177e4 | 227 | { |
78cde088 | 228 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
229 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel); |
230 | } | |
231 | ||
78cde088 GKH |
232 | static ssize_t store_rotate(struct device *device, |
233 | struct device_attribute *attr, | |
234 | const char *buf, size_t count) | |
a812c94b | 235 | { |
78cde088 | 236 | struct fb_info *fb_info = dev_get_drvdata(device); |
a812c94b AD |
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 | ||
78cde088 GKH |
251 | static ssize_t show_rotate(struct device *device, |
252 | struct device_attribute *attr, char *buf) | |
a812c94b | 253 | { |
78cde088 | 254 | struct fb_info *fb_info = dev_get_drvdata(device); |
a812c94b AD |
255 | |
256 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate); | |
257 | } | |
258 | ||
78cde088 GKH |
259 | static ssize_t store_virtual(struct device *device, |
260 | struct device_attribute *attr, | |
261 | const char *buf, size_t count) | |
1da177e4 | 262 | { |
78cde088 | 263 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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); | |
1da177e4 LT |
274 | |
275 | if ((err = activate(fb_info, &var))) | |
276 | return err; | |
277 | return count; | |
278 | } | |
279 | ||
78cde088 GKH |
280 | static ssize_t show_virtual(struct device *device, |
281 | struct device_attribute *attr, char *buf) | |
1da177e4 | 282 | { |
78cde088 | 283 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 | 284 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, |
e2c16499 | 285 | fb_info->var.yres_virtual); |
1da177e4 LT |
286 | } |
287 | ||
78cde088 GKH |
288 | static ssize_t show_stride(struct device *device, |
289 | struct device_attribute *attr, char *buf) | |
c14e2cfc | 290 | { |
78cde088 | 291 | struct fb_info *fb_info = dev_get_drvdata(device); |
c14e2cfc JS |
292 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length); |
293 | } | |
294 | ||
78cde088 GKH |
295 | static ssize_t store_blank(struct device *device, |
296 | struct device_attribute *attr, | |
297 | const char *buf, size_t count) | |
1da177e4 | 298 | { |
78cde088 | 299 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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 | ||
78cde088 GKH |
313 | static ssize_t show_blank(struct device *device, |
314 | struct device_attribute *attr, char *buf) | |
1da177e4 | 315 | { |
78cde088 | 316 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
317 | return 0; |
318 | } | |
319 | ||
78cde088 GKH |
320 | static ssize_t store_console(struct device *device, |
321 | struct device_attribute *attr, | |
322 | const char *buf, size_t count) | |
1da177e4 | 323 | { |
78cde088 | 324 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
325 | return 0; |
326 | } | |
327 | ||
78cde088 GKH |
328 | static ssize_t show_console(struct device *device, |
329 | struct device_attribute *attr, char *buf) | |
1da177e4 | 330 | { |
78cde088 | 331 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
332 | return 0; |
333 | } | |
334 | ||
78cde088 GKH |
335 | static ssize_t store_cursor(struct device *device, |
336 | struct device_attribute *attr, | |
337 | const char *buf, size_t count) | |
1da177e4 | 338 | { |
78cde088 | 339 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
340 | return 0; |
341 | } | |
342 | ||
78cde088 GKH |
343 | static ssize_t show_cursor(struct device *device, |
344 | struct device_attribute *attr, char *buf) | |
1da177e4 | 345 | { |
78cde088 | 346 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
347 | return 0; |
348 | } | |
349 | ||
78cde088 GKH |
350 | static ssize_t store_pan(struct device *device, |
351 | struct device_attribute *attr, | |
352 | const char *buf, size_t count) | |
1da177e4 | 353 | { |
78cde088 | 354 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
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 | ||
78cde088 GKH |
375 | static ssize_t show_pan(struct device *device, |
376 | struct device_attribute *attr, char *buf) | |
1da177e4 | 377 | { |
78cde088 | 378 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 | 379 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, |
c4270637 | 380 | fb_info->var.yoffset); |
1da177e4 LT |
381 | } |
382 | ||
78cde088 GKH |
383 | static ssize_t show_name(struct device *device, |
384 | struct device_attribute *attr, char *buf) | |
02459eaa | 385 | { |
78cde088 | 386 | struct fb_info *fb_info = dev_get_drvdata(device); |
02459eaa JS |
387 | |
388 | return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id); | |
389 | } | |
390 | ||
78cde088 GKH |
391 | static ssize_t store_fbstate(struct device *device, |
392 | struct device_attribute *attr, | |
393 | const char *buf, size_t count) | |
30420f8f | 394 | { |
78cde088 | 395 | struct fb_info *fb_info = dev_get_drvdata(device); |
30420f8f MG |
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 | ||
78cde088 GKH |
408 | static ssize_t show_fbstate(struct device *device, |
409 | struct device_attribute *attr, char *buf) | |
30420f8f | 410 | { |
78cde088 | 411 | struct fb_info *fb_info = dev_get_drvdata(device); |
30420f8f MG |
412 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state); |
413 | } | |
414 | ||
5474c120 | 415 | #ifdef CONFIG_FB_BACKLIGHT |
78cde088 GKH |
416 | static ssize_t store_bl_curve(struct device *device, |
417 | struct device_attribute *attr, | |
418 | const char *buf, size_t count) | |
5474c120 | 419 | { |
78cde088 | 420 | struct fb_info *fb_info = dev_get_drvdata(device); |
5474c120 MH |
421 | u8 tmp_curve[FB_BACKLIGHT_LEVELS]; |
422 | unsigned int i; | |
423 | ||
25981de5 MH |
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 | ||
5474c120 MH |
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 | */ | |
37ce69a5 | 449 | mutex_lock(&fb_info->bl_curve_mutex); |
5474c120 MH |
450 | for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i) |
451 | fb_info->bl_curve[i] = tmp_curve[i]; | |
37ce69a5 | 452 | mutex_unlock(&fb_info->bl_curve_mutex); |
5474c120 MH |
453 | |
454 | return count; | |
455 | } | |
456 | ||
78cde088 GKH |
457 | static ssize_t show_bl_curve(struct device *device, |
458 | struct device_attribute *attr, char *buf) | |
5474c120 | 459 | { |
78cde088 | 460 | struct fb_info *fb_info = dev_get_drvdata(device); |
5474c120 MH |
461 | ssize_t len = 0; |
462 | unsigned int i; | |
463 | ||
25981de5 MH |
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 | ||
37ce69a5 | 470 | mutex_lock(&fb_info->bl_curve_mutex); |
5474c120 MH |
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]); | |
37ce69a5 | 482 | mutex_unlock(&fb_info->bl_curve_mutex); |
5474c120 MH |
483 | |
484 | return len; | |
485 | } | |
486 | #endif | |
487 | ||
913e7ec5 JS |
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 */ | |
78cde088 | 491 | static struct device_attribute device_attrs[] = { |
1da177e4 LT |
492 | __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp), |
493 | __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank), | |
1da177e4 LT |
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), | |
02459eaa | 500 | __ATTR(name, S_IRUGO, show_name, NULL), |
c14e2cfc | 501 | __ATTR(stride, S_IRUGO, show_stride, NULL), |
a812c94b | 502 | __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate), |
30420f8f | 503 | __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate), |
5474c120 MH |
504 | #ifdef CONFIG_FB_BACKLIGHT |
505 | __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve), | |
506 | #endif | |
1da177e4 LT |
507 | }; |
508 | ||
78cde088 | 509 | int fb_init_device(struct fb_info *fb_info) |
1da177e4 | 510 | { |
1a6600be AD |
511 | int i, error = 0; |
512 | ||
78cde088 | 513 | dev_set_drvdata(fb_info->dev, fb_info); |
1da177e4 | 514 | |
1a6600be AD |
515 | fb_info->class_flag |= FB_SYSFS_FLAG_ATTR; |
516 | ||
78cde088 GKH |
517 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { |
518 | error = device_create_file(fb_info->dev, &device_attrs[i]); | |
1a6600be AD |
519 | |
520 | if (error) | |
521 | break; | |
522 | } | |
523 | ||
524 | if (error) { | |
525 | while (--i >= 0) | |
78cde088 | 526 | device_remove_file(fb_info->dev, &device_attrs[i]); |
1a6600be AD |
527 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; |
528 | } | |
529 | ||
1da177e4 LT |
530 | return 0; |
531 | } | |
532 | ||
78cde088 | 533 | void fb_cleanup_device(struct fb_info *fb_info) |
1da177e4 LT |
534 | { |
535 | unsigned int i; | |
536 | ||
1a6600be | 537 | if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) { |
78cde088 GKH |
538 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) |
539 | device_remove_file(fb_info->dev, &device_attrs[i]); | |
1a6600be AD |
540 | |
541 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; | |
542 | } | |
1da177e4 LT |
543 | } |
544 | ||
5474c120 MH |
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 | ||
37ce69a5 RP |
556 | mutex_lock(&fb_info->bl_curve_mutex); |
557 | ||
5474c120 | 558 | fb_info->bl_curve[0] = off; |
1da177e4 | 559 | |
5474c120 MH |
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); | |
37ce69a5 RP |
566 | |
567 | mutex_unlock(&fb_info->bl_curve_mutex); | |
5474c120 MH |
568 | } |
569 | EXPORT_SYMBOL_GPL(fb_bl_default_curve); | |
570 | #endif |