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 | * | |
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 | { | |
1471ca9a | 83 | kfree(info->apertures); |
1da177e4 LT |
84 | kfree(info); |
85 | } | |
86 | EXPORT_SYMBOL(framebuffer_release); | |
87 | ||
88 | static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var) | |
89 | { | |
90 | int err; | |
91 | ||
92 | var->activate |= FB_ACTIVATE_FORCE; | |
93 | acquire_console_sem(); | |
94 | fb_info->flags |= FBINFO_MISC_USEREVENT; | |
95 | err = fb_set_var(fb_info, var); | |
96 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
97 | release_console_sem(); | |
98 | if (err) | |
99 | return err; | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static int mode_string(char *buf, unsigned int offset, | |
104 | const struct fb_videomode *mode) | |
105 | { | |
106 | char m = 'U'; | |
9dac73a4 DT |
107 | char v = 'p'; |
108 | ||
1da177e4 LT |
109 | if (mode->flag & FB_MODE_IS_DETAILED) |
110 | m = 'D'; | |
111 | if (mode->flag & FB_MODE_IS_VESA) | |
112 | m = 'V'; | |
113 | if (mode->flag & FB_MODE_IS_STANDARD) | |
114 | m = 'S'; | |
9dac73a4 DT |
115 | |
116 | if (mode->vmode & FB_VMODE_INTERLACED) | |
117 | v = 'i'; | |
118 | if (mode->vmode & FB_VMODE_DOUBLE) | |
119 | v = 'd'; | |
120 | ||
121 | return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n", | |
122 | m, mode->xres, mode->yres, v, mode->refresh); | |
1da177e4 LT |
123 | } |
124 | ||
78cde088 GKH |
125 | static ssize_t store_mode(struct device *device, struct device_attribute *attr, |
126 | const char *buf, size_t count) | |
1da177e4 | 127 | { |
78cde088 | 128 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
129 | char mstr[100]; |
130 | struct fb_var_screeninfo var; | |
131 | struct fb_modelist *modelist; | |
132 | struct fb_videomode *mode; | |
133 | struct list_head *pos; | |
134 | size_t i; | |
135 | int err; | |
136 | ||
137 | memset(&var, 0, sizeof(var)); | |
138 | ||
139 | list_for_each(pos, &fb_info->modelist) { | |
140 | modelist = list_entry(pos, struct fb_modelist, list); | |
141 | mode = &modelist->mode; | |
142 | i = mode_string(mstr, 0, mode); | |
143 | if (strncmp(mstr, buf, max(count, i)) == 0) { | |
144 | ||
145 | var = fb_info->var; | |
146 | fb_videomode_to_var(&var, mode); | |
147 | if ((err = activate(fb_info, &var))) | |
148 | return err; | |
149 | fb_info->mode = mode; | |
150 | return count; | |
151 | } | |
152 | } | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
78cde088 GKH |
156 | static ssize_t show_mode(struct device *device, struct device_attribute *attr, |
157 | char *buf) | |
1da177e4 | 158 | { |
78cde088 | 159 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
160 | |
161 | if (!fb_info->mode) | |
162 | return 0; | |
163 | ||
164 | return mode_string(buf, 0, fb_info->mode); | |
165 | } | |
166 | ||
78cde088 GKH |
167 | static ssize_t store_modes(struct device *device, |
168 | struct device_attribute *attr, | |
169 | const char *buf, size_t count) | |
1da177e4 | 170 | { |
78cde088 | 171 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
172 | LIST_HEAD(old_list); |
173 | int i = count / sizeof(struct fb_videomode); | |
174 | ||
175 | if (i * sizeof(struct fb_videomode) != count) | |
176 | return -EINVAL; | |
177 | ||
178 | acquire_console_sem(); | |
179 | list_splice(&fb_info->modelist, &old_list); | |
9791d763 | 180 | fb_videomode_to_modelist((const struct fb_videomode *)buf, i, |
1da177e4 LT |
181 | &fb_info->modelist); |
182 | if (fb_new_modelist(fb_info)) { | |
183 | fb_destroy_modelist(&fb_info->modelist); | |
184 | list_splice(&old_list, &fb_info->modelist); | |
185 | } else | |
186 | fb_destroy_modelist(&old_list); | |
187 | ||
188 | release_console_sem(); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
78cde088 GKH |
193 | static ssize_t show_modes(struct device *device, struct device_attribute *attr, |
194 | char *buf) | |
1da177e4 | 195 | { |
78cde088 | 196 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
197 | unsigned int i; |
198 | struct list_head *pos; | |
199 | struct fb_modelist *modelist; | |
200 | const struct fb_videomode *mode; | |
201 | ||
202 | i = 0; | |
203 | list_for_each(pos, &fb_info->modelist) { | |
204 | modelist = list_entry(pos, struct fb_modelist, list); | |
205 | mode = &modelist->mode; | |
206 | i += mode_string(buf, i, mode); | |
207 | } | |
208 | return i; | |
209 | } | |
210 | ||
78cde088 GKH |
211 | static ssize_t store_bpp(struct device *device, struct device_attribute *attr, |
212 | const char *buf, size_t count) | |
1da177e4 | 213 | { |
78cde088 | 214 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
215 | struct fb_var_screeninfo var; |
216 | char ** last = NULL; | |
217 | int err; | |
218 | ||
219 | var = fb_info->var; | |
220 | var.bits_per_pixel = simple_strtoul(buf, last, 0); | |
221 | if ((err = activate(fb_info, &var))) | |
222 | return err; | |
223 | return count; | |
224 | } | |
225 | ||
78cde088 GKH |
226 | static ssize_t show_bpp(struct device *device, struct device_attribute *attr, |
227 | char *buf) | |
1da177e4 | 228 | { |
78cde088 | 229 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
230 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel); |
231 | } | |
232 | ||
78cde088 GKH |
233 | static ssize_t store_rotate(struct device *device, |
234 | struct device_attribute *attr, | |
235 | const char *buf, size_t count) | |
a812c94b | 236 | { |
78cde088 | 237 | struct fb_info *fb_info = dev_get_drvdata(device); |
a812c94b AD |
238 | struct fb_var_screeninfo var; |
239 | char **last = NULL; | |
240 | int err; | |
241 | ||
242 | var = fb_info->var; | |
243 | var.rotate = simple_strtoul(buf, last, 0); | |
244 | ||
245 | if ((err = activate(fb_info, &var))) | |
246 | return err; | |
247 | ||
248 | return count; | |
249 | } | |
250 | ||
251 | ||
78cde088 GKH |
252 | static ssize_t show_rotate(struct device *device, |
253 | struct device_attribute *attr, char *buf) | |
a812c94b | 254 | { |
78cde088 | 255 | struct fb_info *fb_info = dev_get_drvdata(device); |
a812c94b AD |
256 | |
257 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate); | |
258 | } | |
259 | ||
78cde088 GKH |
260 | static ssize_t store_virtual(struct device *device, |
261 | struct device_attribute *attr, | |
262 | const char *buf, size_t count) | |
1da177e4 | 263 | { |
78cde088 | 264 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
265 | struct fb_var_screeninfo var; |
266 | char *last = NULL; | |
267 | int err; | |
268 | ||
269 | var = fb_info->var; | |
270 | var.xres_virtual = simple_strtoul(buf, &last, 0); | |
271 | last++; | |
272 | if (last - buf >= count) | |
273 | return -EINVAL; | |
274 | var.yres_virtual = simple_strtoul(last, &last, 0); | |
1da177e4 LT |
275 | |
276 | if ((err = activate(fb_info, &var))) | |
277 | return err; | |
278 | return count; | |
279 | } | |
280 | ||
78cde088 GKH |
281 | static ssize_t show_virtual(struct device *device, |
282 | struct device_attribute *attr, char *buf) | |
1da177e4 | 283 | { |
78cde088 | 284 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 | 285 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, |
e2c16499 | 286 | fb_info->var.yres_virtual); |
1da177e4 LT |
287 | } |
288 | ||
78cde088 GKH |
289 | static ssize_t show_stride(struct device *device, |
290 | struct device_attribute *attr, char *buf) | |
c14e2cfc | 291 | { |
78cde088 | 292 | struct fb_info *fb_info = dev_get_drvdata(device); |
c14e2cfc JS |
293 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length); |
294 | } | |
295 | ||
78cde088 GKH |
296 | static ssize_t store_blank(struct device *device, |
297 | struct device_attribute *attr, | |
298 | const char *buf, size_t count) | |
1da177e4 | 299 | { |
78cde088 | 300 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
301 | char *last = NULL; |
302 | int err; | |
303 | ||
304 | acquire_console_sem(); | |
305 | fb_info->flags |= FBINFO_MISC_USEREVENT; | |
306 | err = fb_blank(fb_info, simple_strtoul(buf, &last, 0)); | |
307 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
308 | release_console_sem(); | |
309 | if (err < 0) | |
310 | return err; | |
311 | return count; | |
312 | } | |
313 | ||
78cde088 GKH |
314 | static ssize_t show_blank(struct device *device, |
315 | struct device_attribute *attr, char *buf) | |
1da177e4 | 316 | { |
78cde088 | 317 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
318 | return 0; |
319 | } | |
320 | ||
78cde088 GKH |
321 | static ssize_t store_console(struct device *device, |
322 | struct device_attribute *attr, | |
323 | const char *buf, size_t count) | |
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 show_console(struct device *device, |
330 | struct device_attribute *attr, char *buf) | |
1da177e4 | 331 | { |
78cde088 | 332 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
333 | return 0; |
334 | } | |
335 | ||
78cde088 GKH |
336 | static ssize_t store_cursor(struct device *device, |
337 | struct device_attribute *attr, | |
338 | const char *buf, size_t count) | |
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 show_cursor(struct device *device, |
345 | struct device_attribute *attr, char *buf) | |
1da177e4 | 346 | { |
78cde088 | 347 | // struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
348 | return 0; |
349 | } | |
350 | ||
78cde088 GKH |
351 | static ssize_t store_pan(struct device *device, |
352 | struct device_attribute *attr, | |
353 | const char *buf, size_t count) | |
1da177e4 | 354 | { |
78cde088 | 355 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 LT |
356 | struct fb_var_screeninfo var; |
357 | char *last = NULL; | |
358 | int err; | |
359 | ||
360 | var = fb_info->var; | |
361 | var.xoffset = simple_strtoul(buf, &last, 0); | |
362 | last++; | |
363 | if (last - buf >= count) | |
364 | return -EINVAL; | |
365 | var.yoffset = simple_strtoul(last, &last, 0); | |
366 | ||
367 | acquire_console_sem(); | |
368 | err = fb_pan_display(fb_info, &var); | |
369 | release_console_sem(); | |
370 | ||
371 | if (err < 0) | |
372 | return err; | |
373 | return count; | |
374 | } | |
375 | ||
78cde088 GKH |
376 | static ssize_t show_pan(struct device *device, |
377 | struct device_attribute *attr, char *buf) | |
1da177e4 | 378 | { |
78cde088 | 379 | struct fb_info *fb_info = dev_get_drvdata(device); |
1da177e4 | 380 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, |
c4270637 | 381 | fb_info->var.yoffset); |
1da177e4 LT |
382 | } |
383 | ||
78cde088 GKH |
384 | static ssize_t show_name(struct device *device, |
385 | struct device_attribute *attr, char *buf) | |
02459eaa | 386 | { |
78cde088 | 387 | struct fb_info *fb_info = dev_get_drvdata(device); |
02459eaa JS |
388 | |
389 | return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id); | |
390 | } | |
391 | ||
78cde088 GKH |
392 | static ssize_t store_fbstate(struct device *device, |
393 | struct device_attribute *attr, | |
394 | const char *buf, size_t count) | |
30420f8f | 395 | { |
78cde088 | 396 | struct fb_info *fb_info = dev_get_drvdata(device); |
30420f8f MG |
397 | u32 state; |
398 | char *last = NULL; | |
399 | ||
400 | state = simple_strtoul(buf, &last, 0); | |
401 | ||
402 | acquire_console_sem(); | |
403 | fb_set_suspend(fb_info, (int)state); | |
404 | release_console_sem(); | |
405 | ||
406 | return count; | |
407 | } | |
408 | ||
78cde088 GKH |
409 | static ssize_t show_fbstate(struct device *device, |
410 | struct device_attribute *attr, char *buf) | |
30420f8f | 411 | { |
78cde088 | 412 | struct fb_info *fb_info = dev_get_drvdata(device); |
30420f8f MG |
413 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state); |
414 | } | |
415 | ||
5474c120 | 416 | #ifdef CONFIG_FB_BACKLIGHT |
78cde088 GKH |
417 | static ssize_t store_bl_curve(struct device *device, |
418 | struct device_attribute *attr, | |
419 | const char *buf, size_t count) | |
5474c120 | 420 | { |
78cde088 | 421 | struct fb_info *fb_info = dev_get_drvdata(device); |
5474c120 MH |
422 | u8 tmp_curve[FB_BACKLIGHT_LEVELS]; |
423 | unsigned int i; | |
424 | ||
25981de5 MH |
425 | /* Some drivers don't use framebuffer_alloc(), but those also |
426 | * don't have backlights. | |
427 | */ | |
428 | if (!fb_info || !fb_info->bl_dev) | |
429 | return -ENODEV; | |
430 | ||
5474c120 MH |
431 | if (count != (FB_BACKLIGHT_LEVELS / 8 * 24)) |
432 | return -EINVAL; | |
433 | ||
434 | for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i) | |
435 | if (sscanf(&buf[i * 24], | |
436 | "%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n", | |
437 | &tmp_curve[i * 8 + 0], | |
438 | &tmp_curve[i * 8 + 1], | |
439 | &tmp_curve[i * 8 + 2], | |
440 | &tmp_curve[i * 8 + 3], | |
441 | &tmp_curve[i * 8 + 4], | |
442 | &tmp_curve[i * 8 + 5], | |
443 | &tmp_curve[i * 8 + 6], | |
444 | &tmp_curve[i * 8 + 7]) != 8) | |
445 | return -EINVAL; | |
446 | ||
447 | /* If there has been an error in the input data, we won't | |
448 | * reach this loop. | |
449 | */ | |
37ce69a5 | 450 | mutex_lock(&fb_info->bl_curve_mutex); |
5474c120 MH |
451 | for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i) |
452 | fb_info->bl_curve[i] = tmp_curve[i]; | |
37ce69a5 | 453 | mutex_unlock(&fb_info->bl_curve_mutex); |
5474c120 MH |
454 | |
455 | return count; | |
456 | } | |
457 | ||
78cde088 GKH |
458 | static ssize_t show_bl_curve(struct device *device, |
459 | struct device_attribute *attr, char *buf) | |
5474c120 | 460 | { |
78cde088 | 461 | struct fb_info *fb_info = dev_get_drvdata(device); |
5474c120 MH |
462 | ssize_t len = 0; |
463 | unsigned int i; | |
464 | ||
25981de5 MH |
465 | /* Some drivers don't use framebuffer_alloc(), but those also |
466 | * don't have backlights. | |
467 | */ | |
468 | if (!fb_info || !fb_info->bl_dev) | |
469 | return -ENODEV; | |
470 | ||
37ce69a5 | 471 | mutex_lock(&fb_info->bl_curve_mutex); |
5474c120 MH |
472 | for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8) |
473 | len += snprintf(&buf[len], PAGE_SIZE, | |
474 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
475 | fb_info->bl_curve[i + 0], | |
476 | fb_info->bl_curve[i + 1], | |
477 | fb_info->bl_curve[i + 2], | |
478 | fb_info->bl_curve[i + 3], | |
479 | fb_info->bl_curve[i + 4], | |
480 | fb_info->bl_curve[i + 5], | |
481 | fb_info->bl_curve[i + 6], | |
482 | fb_info->bl_curve[i + 7]); | |
37ce69a5 | 483 | mutex_unlock(&fb_info->bl_curve_mutex); |
5474c120 MH |
484 | |
485 | return len; | |
486 | } | |
487 | #endif | |
488 | ||
913e7ec5 JS |
489 | /* When cmap is added back in it should be a binary attribute |
490 | * not a text one. Consideration should also be given to converting | |
491 | * fbdev to use configfs instead of sysfs */ | |
78cde088 | 492 | static struct device_attribute device_attrs[] = { |
1da177e4 LT |
493 | __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp), |
494 | __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank), | |
1da177e4 LT |
495 | __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console), |
496 | __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor), | |
497 | __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode), | |
498 | __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes), | |
499 | __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan), | |
500 | __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual), | |
02459eaa | 501 | __ATTR(name, S_IRUGO, show_name, NULL), |
c14e2cfc | 502 | __ATTR(stride, S_IRUGO, show_stride, NULL), |
a812c94b | 503 | __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate), |
30420f8f | 504 | __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate), |
5474c120 MH |
505 | #ifdef CONFIG_FB_BACKLIGHT |
506 | __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve), | |
507 | #endif | |
1da177e4 LT |
508 | }; |
509 | ||
78cde088 | 510 | int fb_init_device(struct fb_info *fb_info) |
1da177e4 | 511 | { |
1a6600be AD |
512 | int i, error = 0; |
513 | ||
78cde088 | 514 | dev_set_drvdata(fb_info->dev, fb_info); |
1da177e4 | 515 | |
1a6600be AD |
516 | fb_info->class_flag |= FB_SYSFS_FLAG_ATTR; |
517 | ||
78cde088 GKH |
518 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { |
519 | error = device_create_file(fb_info->dev, &device_attrs[i]); | |
1a6600be AD |
520 | |
521 | if (error) | |
522 | break; | |
523 | } | |
524 | ||
525 | if (error) { | |
526 | while (--i >= 0) | |
78cde088 | 527 | device_remove_file(fb_info->dev, &device_attrs[i]); |
1a6600be AD |
528 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; |
529 | } | |
530 | ||
1da177e4 LT |
531 | return 0; |
532 | } | |
533 | ||
78cde088 | 534 | void fb_cleanup_device(struct fb_info *fb_info) |
1da177e4 LT |
535 | { |
536 | unsigned int i; | |
537 | ||
1a6600be | 538 | if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) { |
78cde088 GKH |
539 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) |
540 | device_remove_file(fb_info->dev, &device_attrs[i]); | |
1a6600be AD |
541 | |
542 | fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR; | |
543 | } | |
1da177e4 LT |
544 | } |
545 | ||
5474c120 MH |
546 | #ifdef CONFIG_FB_BACKLIGHT |
547 | /* This function generates a linear backlight curve | |
548 | * | |
549 | * 0: off | |
550 | * 1-7: min | |
551 | * 8-127: linear from min to max | |
552 | */ | |
553 | void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max) | |
554 | { | |
555 | unsigned int i, flat, count, range = (max - min); | |
556 | ||
37ce69a5 RP |
557 | mutex_lock(&fb_info->bl_curve_mutex); |
558 | ||
5474c120 | 559 | fb_info->bl_curve[0] = off; |
1da177e4 | 560 | |
5474c120 MH |
561 | for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat) |
562 | fb_info->bl_curve[flat] = min; | |
563 | ||
564 | count = FB_BACKLIGHT_LEVELS * 15 / 16; | |
565 | for (i = 0; i < count; ++i) | |
566 | fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count); | |
37ce69a5 RP |
567 | |
568 | mutex_unlock(&fb_info->bl_curve_mutex); | |
5474c120 MH |
569 | } |
570 | EXPORT_SYMBOL_GPL(fb_bl_default_curve); | |
571 | #endif |