2 * fbsysfs.c - framebuffer device class and attributes
4 * Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
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.
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.
18 #include <linux/kernel.h>
20 #include <linux/console.h>
21 #include <linux/module.h>
23 #define FB_SYSFS_FLAG_ATTR 1
26 * framebuffer_alloc - creates a new frame buffer info structure
28 * @size: size of driver private data, can be zero
29 * @dev: pointer to the device for this fb, this can be NULL
31 * Creates a new frame buffer info structure. Also reserves @size bytes
32 * for driver private data (info->par). info->par (if any) will be
33 * aligned to sizeof(long).
35 * Returns the new structure, or NULL if an error occured.
38 struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
40 #define BYTES_PER_LONG (BITS_PER_LONG/8)
41 #define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
42 int fb_info_size = sizeof(struct fb_info);
47 fb_info_size += PADDING;
49 p = kzalloc(fb_info_size + size, GFP_KERNEL);
54 info = (struct fb_info *) p;
57 info->par = p + fb_info_size;
61 #ifdef CONFIG_FB_BACKLIGHT
62 mutex_init(&info->bl_curve_mutex);
69 EXPORT_SYMBOL(framebuffer_alloc);
72 * framebuffer_release - marks the structure available for freeing
74 * @info: frame buffer info structure
76 * Drop the reference count of the device embedded in the
77 * framebuffer info structure.
80 void framebuffer_release(struct fb_info *info)
84 EXPORT_SYMBOL(framebuffer_release);
86 static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
90 var->activate |= FB_ACTIVATE_FORCE;
91 acquire_console_sem();
92 fb_info->flags |= FBINFO_MISC_USEREVENT;
93 err = fb_set_var(fb_info, var);
94 fb_info->flags &= ~FBINFO_MISC_USEREVENT;
95 release_console_sem();
101 static int mode_string(char *buf, unsigned int offset,
102 const struct fb_videomode *mode)
107 if (mode->flag & FB_MODE_IS_DETAILED)
109 if (mode->flag & FB_MODE_IS_VESA)
111 if (mode->flag & FB_MODE_IS_STANDARD)
114 if (mode->vmode & FB_VMODE_INTERLACED)
116 if (mode->vmode & FB_VMODE_DOUBLE)
119 return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
120 m, mode->xres, mode->yres, v, mode->refresh);
123 static ssize_t store_mode(struct device *device, struct device_attribute *attr,
124 const char *buf, size_t count)
126 struct fb_info *fb_info = dev_get_drvdata(device);
128 struct fb_var_screeninfo var;
129 struct fb_modelist *modelist;
130 struct fb_videomode *mode;
131 struct list_head *pos;
135 memset(&var, 0, sizeof(var));
137 list_for_each(pos, &fb_info->modelist) {
138 modelist = list_entry(pos, struct fb_modelist, list);
139 mode = &modelist->mode;
140 i = mode_string(mstr, 0, mode);
141 if (strncmp(mstr, buf, max(count, i)) == 0) {
144 fb_videomode_to_var(&var, mode);
145 if ((err = activate(fb_info, &var)))
147 fb_info->mode = mode;
154 static ssize_t show_mode(struct device *device, struct device_attribute *attr,
157 struct fb_info *fb_info = dev_get_drvdata(device);
162 return mode_string(buf, 0, fb_info->mode);
165 static ssize_t store_modes(struct device *device,
166 struct device_attribute *attr,
167 const char *buf, size_t count)
169 struct fb_info *fb_info = dev_get_drvdata(device);
171 int i = count / sizeof(struct fb_videomode);
173 if (i * sizeof(struct fb_videomode) != count)
176 acquire_console_sem();
177 list_splice(&fb_info->modelist, &old_list);
178 fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
180 if (fb_new_modelist(fb_info)) {
181 fb_destroy_modelist(&fb_info->modelist);
182 list_splice(&old_list, &fb_info->modelist);
184 fb_destroy_modelist(&old_list);
186 release_console_sem();
191 static ssize_t show_modes(struct device *device, struct device_attribute *attr,
194 struct fb_info *fb_info = dev_get_drvdata(device);
196 struct list_head *pos;
197 struct fb_modelist *modelist;
198 const struct fb_videomode *mode;
201 list_for_each(pos, &fb_info->modelist) {
202 modelist = list_entry(pos, struct fb_modelist, list);
203 mode = &modelist->mode;
204 i += mode_string(buf, i, mode);
209 static ssize_t store_bpp(struct device *device, struct device_attribute *attr,
210 const char *buf, size_t count)
212 struct fb_info *fb_info = dev_get_drvdata(device);
213 struct fb_var_screeninfo var;
218 var.bits_per_pixel = simple_strtoul(buf, last, 0);
219 if ((err = activate(fb_info, &var)))
224 static ssize_t show_bpp(struct device *device, struct device_attribute *attr,
227 struct fb_info *fb_info = dev_get_drvdata(device);
228 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
231 static ssize_t store_rotate(struct device *device,
232 struct device_attribute *attr,
233 const char *buf, size_t count)
235 struct fb_info *fb_info = dev_get_drvdata(device);
236 struct fb_var_screeninfo var;
241 var.rotate = simple_strtoul(buf, last, 0);
243 if ((err = activate(fb_info, &var)))
250 static ssize_t show_rotate(struct device *device,
251 struct device_attribute *attr, char *buf)
253 struct fb_info *fb_info = dev_get_drvdata(device);
255 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
258 static ssize_t store_virtual(struct device *device,
259 struct device_attribute *attr,
260 const char *buf, size_t count)
262 struct fb_info *fb_info = dev_get_drvdata(device);
263 struct fb_var_screeninfo var;
268 var.xres_virtual = simple_strtoul(buf, &last, 0);
270 if (last - buf >= count)
272 var.yres_virtual = simple_strtoul(last, &last, 0);
274 if ((err = activate(fb_info, &var)))
279 static ssize_t show_virtual(struct device *device,
280 struct device_attribute *attr, char *buf)
282 struct fb_info *fb_info = dev_get_drvdata(device);
283 return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
284 fb_info->var.yres_virtual);
287 static ssize_t show_stride(struct device *device,
288 struct device_attribute *attr, char *buf)
290 struct fb_info *fb_info = dev_get_drvdata(device);
291 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
294 static ssize_t store_blank(struct device *device,
295 struct device_attribute *attr,
296 const char *buf, size_t count)
298 struct fb_info *fb_info = dev_get_drvdata(device);
302 acquire_console_sem();
303 fb_info->flags |= FBINFO_MISC_USEREVENT;
304 err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
305 fb_info->flags &= ~FBINFO_MISC_USEREVENT;
306 release_console_sem();
312 static ssize_t show_blank(struct device *device,
313 struct device_attribute *attr, char *buf)
315 // struct fb_info *fb_info = dev_get_drvdata(device);
319 static ssize_t store_console(struct device *device,
320 struct device_attribute *attr,
321 const char *buf, size_t count)
323 // struct fb_info *fb_info = dev_get_drvdata(device);
327 static ssize_t show_console(struct device *device,
328 struct device_attribute *attr, char *buf)
330 // struct fb_info *fb_info = dev_get_drvdata(device);
334 static ssize_t store_cursor(struct device *device,
335 struct device_attribute *attr,
336 const char *buf, size_t count)
338 // struct fb_info *fb_info = dev_get_drvdata(device);
342 static ssize_t show_cursor(struct device *device,
343 struct device_attribute *attr, char *buf)
345 // struct fb_info *fb_info = dev_get_drvdata(device);
349 static ssize_t store_pan(struct device *device,
350 struct device_attribute *attr,
351 const char *buf, size_t count)
353 struct fb_info *fb_info = dev_get_drvdata(device);
354 struct fb_var_screeninfo var;
359 var.xoffset = simple_strtoul(buf, &last, 0);
361 if (last - buf >= count)
363 var.yoffset = simple_strtoul(last, &last, 0);
365 acquire_console_sem();
366 err = fb_pan_display(fb_info, &var);
367 release_console_sem();
374 static ssize_t show_pan(struct device *device,
375 struct device_attribute *attr, char *buf)
377 struct fb_info *fb_info = dev_get_drvdata(device);
378 return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
379 fb_info->var.yoffset);
382 static ssize_t show_name(struct device *device,
383 struct device_attribute *attr, char *buf)
385 struct fb_info *fb_info = dev_get_drvdata(device);
387 return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
390 static ssize_t store_fbstate(struct device *device,
391 struct device_attribute *attr,
392 const char *buf, size_t count)
394 struct fb_info *fb_info = dev_get_drvdata(device);
398 state = simple_strtoul(buf, &last, 0);
400 acquire_console_sem();
401 fb_set_suspend(fb_info, (int)state);
402 release_console_sem();
407 static ssize_t show_fbstate(struct device *device,
408 struct device_attribute *attr, char *buf)
410 struct fb_info *fb_info = dev_get_drvdata(device);
411 return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
414 #ifdef CONFIG_FB_BACKLIGHT
415 static ssize_t store_bl_curve(struct device *device,
416 struct device_attribute *attr,
417 const char *buf, size_t count)
419 struct fb_info *fb_info = dev_get_drvdata(device);
420 u8 tmp_curve[FB_BACKLIGHT_LEVELS];
423 /* Some drivers don't use framebuffer_alloc(), but those also
424 * don't have backlights.
426 if (!fb_info || !fb_info->bl_dev)
429 if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
432 for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
433 if (sscanf(&buf[i * 24],
434 "%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
435 &tmp_curve[i * 8 + 0],
436 &tmp_curve[i * 8 + 1],
437 &tmp_curve[i * 8 + 2],
438 &tmp_curve[i * 8 + 3],
439 &tmp_curve[i * 8 + 4],
440 &tmp_curve[i * 8 + 5],
441 &tmp_curve[i * 8 + 6],
442 &tmp_curve[i * 8 + 7]) != 8)
445 /* If there has been an error in the input data, we won't
448 mutex_lock(&fb_info->bl_curve_mutex);
449 for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
450 fb_info->bl_curve[i] = tmp_curve[i];
451 mutex_unlock(&fb_info->bl_curve_mutex);
456 static ssize_t show_bl_curve(struct device *device,
457 struct device_attribute *attr, char *buf)
459 struct fb_info *fb_info = dev_get_drvdata(device);
463 /* Some drivers don't use framebuffer_alloc(), but those also
464 * don't have backlights.
466 if (!fb_info || !fb_info->bl_dev)
469 mutex_lock(&fb_info->bl_curve_mutex);
470 for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
471 len += snprintf(&buf[len], PAGE_SIZE,
472 "%02x %02x %02x %02x %02x %02x %02x %02x\n",
473 fb_info->bl_curve[i + 0],
474 fb_info->bl_curve[i + 1],
475 fb_info->bl_curve[i + 2],
476 fb_info->bl_curve[i + 3],
477 fb_info->bl_curve[i + 4],
478 fb_info->bl_curve[i + 5],
479 fb_info->bl_curve[i + 6],
480 fb_info->bl_curve[i + 7]);
481 mutex_unlock(&fb_info->bl_curve_mutex);
487 /* When cmap is added back in it should be a binary attribute
488 * not a text one. Consideration should also be given to converting
489 * fbdev to use configfs instead of sysfs */
490 static struct device_attribute device_attrs[] = {
491 __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
492 __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
493 __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console),
494 __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor),
495 __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode),
496 __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes),
497 __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan),
498 __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual),
499 __ATTR(name, S_IRUGO, show_name, NULL),
500 __ATTR(stride, S_IRUGO, show_stride, NULL),
501 __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
502 __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
503 #ifdef CONFIG_FB_BACKLIGHT
504 __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve),
508 int fb_init_device(struct fb_info *fb_info)
512 dev_set_drvdata(fb_info->dev, fb_info);
514 fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;
516 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
517 error = device_create_file(fb_info->dev, &device_attrs[i]);
525 device_remove_file(fb_info->dev, &device_attrs[i]);
526 fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
532 void fb_cleanup_device(struct fb_info *fb_info)
536 if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
537 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
538 device_remove_file(fb_info->dev, &device_attrs[i]);
540 fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
544 #ifdef CONFIG_FB_BACKLIGHT
545 /* This function generates a linear backlight curve
549 * 8-127: linear from min to max
551 void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
553 unsigned int i, flat, count, range = (max - min);
555 mutex_lock(&fb_info->bl_curve_mutex);
557 fb_info->bl_curve[0] = off;
559 for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
560 fb_info->bl_curve[flat] = min;
562 count = FB_BACKLIGHT_LEVELS * 15 / 16;
563 for (i = 0; i < count; ++i)
564 fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
566 mutex_unlock(&fb_info->bl_curve_mutex);
568 EXPORT_SYMBOL_GPL(fb_bl_default_curve);