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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> | |
19 | #include <linux/fb.h> | |
20 | #include <linux/console.h> | |
21 | ||
22 | /** | |
23 | * framebuffer_alloc - creates a new frame buffer info structure | |
24 | * | |
25 | * @size: size of driver private data, can be zero | |
26 | * @dev: pointer to the device for this fb, this can be NULL | |
27 | * | |
28 | * Creates a new frame buffer info structure. Also reserves @size bytes | |
29 | * for driver private data (info->par). info->par (if any) will be | |
30 | * aligned to sizeof(long). | |
31 | * | |
32 | * Returns the new structure, or NULL if an error occured. | |
33 | * | |
34 | */ | |
35 | struct fb_info *framebuffer_alloc(size_t size, struct device *dev) | |
36 | { | |
37 | #define BYTES_PER_LONG (BITS_PER_LONG/8) | |
38 | #define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG)) | |
39 | int fb_info_size = sizeof(struct fb_info); | |
40 | struct fb_info *info; | |
41 | char *p; | |
42 | ||
43 | if (size) | |
44 | fb_info_size += PADDING; | |
45 | ||
46 | p = kmalloc(fb_info_size + size, GFP_KERNEL); | |
47 | if (!p) | |
48 | return NULL; | |
49 | memset(p, 0, fb_info_size + size); | |
50 | info = (struct fb_info *) p; | |
51 | ||
52 | if (size) | |
53 | info->par = p + fb_info_size; | |
54 | ||
55 | info->device = dev; | |
56 | ||
57 | return info; | |
58 | #undef PADDING | |
59 | #undef BYTES_PER_LONG | |
60 | } | |
61 | EXPORT_SYMBOL(framebuffer_alloc); | |
62 | ||
63 | /** | |
64 | * framebuffer_release - marks the structure available for freeing | |
65 | * | |
66 | * @info: frame buffer info structure | |
67 | * | |
68 | * Drop the reference count of the class_device embedded in the | |
69 | * framebuffer info structure. | |
70 | * | |
71 | */ | |
72 | void framebuffer_release(struct fb_info *info) | |
73 | { | |
74 | kfree(info); | |
75 | } | |
76 | EXPORT_SYMBOL(framebuffer_release); | |
77 | ||
78 | static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var) | |
79 | { | |
80 | int err; | |
81 | ||
82 | var->activate |= FB_ACTIVATE_FORCE; | |
83 | acquire_console_sem(); | |
84 | fb_info->flags |= FBINFO_MISC_USEREVENT; | |
85 | err = fb_set_var(fb_info, var); | |
86 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
87 | release_console_sem(); | |
88 | if (err) | |
89 | return err; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static int mode_string(char *buf, unsigned int offset, | |
94 | const struct fb_videomode *mode) | |
95 | { | |
96 | char m = 'U'; | |
97 | if (mode->flag & FB_MODE_IS_DETAILED) | |
98 | m = 'D'; | |
99 | if (mode->flag & FB_MODE_IS_VESA) | |
100 | m = 'V'; | |
101 | if (mode->flag & FB_MODE_IS_STANDARD) | |
102 | m = 'S'; | |
103 | return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d-%d\n", m, mode->xres, mode->yres, mode->refresh); | |
104 | } | |
105 | ||
106 | static ssize_t store_mode(struct class_device *class_device, const char * buf, | |
107 | size_t count) | |
108 | { | |
109 | struct fb_info *fb_info = | |
110 | (struct fb_info *)class_get_devdata(class_device); | |
111 | char mstr[100]; | |
112 | struct fb_var_screeninfo var; | |
113 | struct fb_modelist *modelist; | |
114 | struct fb_videomode *mode; | |
115 | struct list_head *pos; | |
116 | size_t i; | |
117 | int err; | |
118 | ||
119 | memset(&var, 0, sizeof(var)); | |
120 | ||
121 | list_for_each(pos, &fb_info->modelist) { | |
122 | modelist = list_entry(pos, struct fb_modelist, list); | |
123 | mode = &modelist->mode; | |
124 | i = mode_string(mstr, 0, mode); | |
125 | if (strncmp(mstr, buf, max(count, i)) == 0) { | |
126 | ||
127 | var = fb_info->var; | |
128 | fb_videomode_to_var(&var, mode); | |
129 | if ((err = activate(fb_info, &var))) | |
130 | return err; | |
131 | fb_info->mode = mode; | |
132 | return count; | |
133 | } | |
134 | } | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | static ssize_t show_mode(struct class_device *class_device, char *buf) | |
139 | { | |
140 | struct fb_info *fb_info = | |
141 | (struct fb_info *)class_get_devdata(class_device); | |
142 | ||
143 | if (!fb_info->mode) | |
144 | return 0; | |
145 | ||
146 | return mode_string(buf, 0, fb_info->mode); | |
147 | } | |
148 | ||
149 | static ssize_t store_modes(struct class_device *class_device, const char * buf, | |
150 | size_t count) | |
151 | { | |
152 | struct fb_info *fb_info = | |
153 | (struct fb_info *)class_get_devdata(class_device); | |
154 | LIST_HEAD(old_list); | |
155 | int i = count / sizeof(struct fb_videomode); | |
156 | ||
157 | if (i * sizeof(struct fb_videomode) != count) | |
158 | return -EINVAL; | |
159 | ||
160 | acquire_console_sem(); | |
161 | list_splice(&fb_info->modelist, &old_list); | |
162 | fb_videomode_to_modelist((struct fb_videomode *)buf, i, | |
163 | &fb_info->modelist); | |
164 | if (fb_new_modelist(fb_info)) { | |
165 | fb_destroy_modelist(&fb_info->modelist); | |
166 | list_splice(&old_list, &fb_info->modelist); | |
167 | } else | |
168 | fb_destroy_modelist(&old_list); | |
169 | ||
170 | release_console_sem(); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static ssize_t show_modes(struct class_device *class_device, char *buf) | |
176 | { | |
177 | struct fb_info *fb_info = | |
178 | (struct fb_info *)class_get_devdata(class_device); | |
179 | unsigned int i; | |
180 | struct list_head *pos; | |
181 | struct fb_modelist *modelist; | |
182 | const struct fb_videomode *mode; | |
183 | ||
184 | i = 0; | |
185 | list_for_each(pos, &fb_info->modelist) { | |
186 | modelist = list_entry(pos, struct fb_modelist, list); | |
187 | mode = &modelist->mode; | |
188 | i += mode_string(buf, i, mode); | |
189 | } | |
190 | return i; | |
191 | } | |
192 | ||
193 | static ssize_t store_bpp(struct class_device *class_device, const char * buf, | |
194 | size_t count) | |
195 | { | |
196 | struct fb_info *fb_info = | |
197 | (struct fb_info *)class_get_devdata(class_device); | |
198 | struct fb_var_screeninfo var; | |
199 | char ** last = NULL; | |
200 | int err; | |
201 | ||
202 | var = fb_info->var; | |
203 | var.bits_per_pixel = simple_strtoul(buf, last, 0); | |
204 | if ((err = activate(fb_info, &var))) | |
205 | return err; | |
206 | return count; | |
207 | } | |
208 | ||
209 | static ssize_t show_bpp(struct class_device *class_device, char *buf) | |
210 | { | |
211 | struct fb_info *fb_info = | |
212 | (struct fb_info *)class_get_devdata(class_device); | |
213 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel); | |
214 | } | |
215 | ||
a812c94b AD |
216 | static ssize_t store_rotate(struct class_device *class_device, const char *buf, |
217 | size_t count) | |
218 | { | |
219 | struct fb_info *fb_info = class_get_devdata(class_device); | |
220 | struct fb_var_screeninfo var; | |
221 | char **last = NULL; | |
222 | int err; | |
223 | ||
224 | var = fb_info->var; | |
225 | var.rotate = simple_strtoul(buf, last, 0); | |
226 | ||
227 | if ((err = activate(fb_info, &var))) | |
228 | return err; | |
229 | ||
230 | return count; | |
231 | } | |
232 | ||
233 | ||
234 | static ssize_t show_rotate(struct class_device *class_device, char *buf) | |
235 | { | |
236 | struct fb_info *fb_info = class_get_devdata(class_device); | |
237 | ||
238 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate); | |
239 | } | |
240 | ||
241 | static ssize_t store_con_rotate(struct class_device *class_device, | |
242 | const char *buf, size_t count) | |
243 | { | |
244 | struct fb_info *fb_info = class_get_devdata(class_device); | |
245 | int rotate; | |
246 | char **last = NULL; | |
247 | ||
248 | acquire_console_sem(); | |
249 | rotate = simple_strtoul(buf, last, 0); | |
250 | fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE, &rotate); | |
251 | release_console_sem(); | |
252 | return count; | |
253 | } | |
254 | ||
255 | static ssize_t store_con_rotate_all(struct class_device *class_device, | |
256 | const char *buf, size_t count) | |
257 | { | |
258 | struct fb_info *fb_info = class_get_devdata(class_device); | |
259 | int rotate; | |
260 | char **last = NULL; | |
261 | ||
262 | acquire_console_sem(); | |
263 | rotate = simple_strtoul(buf, last, 0); | |
264 | fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE_ALL, &rotate); | |
265 | release_console_sem(); | |
266 | return count; | |
267 | } | |
268 | ||
269 | static ssize_t show_con_rotate(struct class_device *class_device, char *buf) | |
270 | { | |
271 | struct fb_info *fb_info = class_get_devdata(class_device); | |
272 | int rotate; | |
273 | ||
274 | acquire_console_sem(); | |
275 | rotate = fb_con_duit(fb_info, FB_EVENT_GET_CON_ROTATE, NULL); | |
276 | release_console_sem(); | |
277 | return snprintf(buf, PAGE_SIZE, "%d\n", rotate); | |
278 | } | |
279 | ||
1da177e4 LT |
280 | static ssize_t store_virtual(struct class_device *class_device, |
281 | const char * buf, size_t count) | |
282 | { | |
283 | struct fb_info *fb_info = | |
284 | (struct fb_info *)class_get_devdata(class_device); | |
285 | struct fb_var_screeninfo var; | |
286 | char *last = NULL; | |
287 | int err; | |
288 | ||
289 | var = fb_info->var; | |
290 | var.xres_virtual = simple_strtoul(buf, &last, 0); | |
291 | last++; | |
292 | if (last - buf >= count) | |
293 | return -EINVAL; | |
294 | var.yres_virtual = simple_strtoul(last, &last, 0); | |
1da177e4 LT |
295 | |
296 | if ((err = activate(fb_info, &var))) | |
297 | return err; | |
298 | return count; | |
299 | } | |
300 | ||
301 | static ssize_t show_virtual(struct class_device *class_device, char *buf) | |
302 | { | |
303 | struct fb_info *fb_info = | |
304 | (struct fb_info *)class_get_devdata(class_device); | |
305 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, | |
e2c16499 | 306 | fb_info->var.yres_virtual); |
1da177e4 LT |
307 | } |
308 | ||
c14e2cfc JS |
309 | static ssize_t show_stride(struct class_device *class_device, char *buf) |
310 | { | |
311 | struct fb_info *fb_info = | |
312 | (struct fb_info *)class_get_devdata(class_device); | |
313 | return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length); | |
314 | } | |
315 | ||
d2102247 JS |
316 | /* Format for cmap is "%02x%c%4x%4x%4x\n" */ |
317 | /* %02x entry %c transp %4x red %4x blue %4x green \n */ | |
f0b9d796 JS |
318 | /* 256 rows at 16 chars equals 4096, the normal page size */ |
319 | /* the code will automatically adjust for different page sizes */ | |
d2102247 | 320 | static ssize_t store_cmap(struct class_device *class_device, const char *buf, |
1da177e4 LT |
321 | size_t count) |
322 | { | |
d2102247 JS |
323 | struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); |
324 | int rc, i, start, length, transp = 0; | |
325 | ||
f0b9d796 | 326 | if ((count > PAGE_SIZE) || ((count % 16) != 0)) |
d2102247 JS |
327 | return -EINVAL; |
328 | ||
329 | if (!fb_info->fbops->fb_setcolreg && !fb_info->fbops->fb_setcmap) | |
330 | return -EINVAL; | |
331 | ||
332 | sscanf(buf, "%02x", &start); | |
333 | length = count / 16; | |
334 | ||
335 | for (i = 0; i < length; i++) | |
336 | if (buf[i * 16 + 2] != ' ') | |
337 | transp = 1; | |
338 | ||
339 | /* If we can batch, do it */ | |
340 | if (fb_info->fbops->fb_setcmap && length > 1) { | |
341 | struct fb_cmap umap; | |
342 | ||
343 | memset(&umap, 0, sizeof(umap)); | |
344 | if ((rc = fb_alloc_cmap(&umap, length, transp))) | |
345 | return rc; | |
346 | ||
347 | umap.start = start; | |
348 | for (i = 0; i < length; i++) { | |
349 | sscanf(&buf[i * 16 + 3], "%4hx", &umap.red[i]); | |
350 | sscanf(&buf[i * 16 + 7], "%4hx", &umap.blue[i]); | |
351 | sscanf(&buf[i * 16 + 11], "%4hx", &umap.green[i]); | |
352 | if (transp) | |
353 | umap.transp[i] = (buf[i * 16 + 2] != ' '); | |
354 | } | |
355 | rc = fb_info->fbops->fb_setcmap(&umap, fb_info); | |
356 | fb_copy_cmap(&umap, &fb_info->cmap); | |
357 | fb_dealloc_cmap(&umap); | |
358 | ||
359 | return rc; | |
360 | } | |
361 | for (i = 0; i < length; i++) { | |
362 | u16 red, blue, green, tsp; | |
363 | ||
364 | sscanf(&buf[i * 16 + 3], "%4hx", &red); | |
365 | sscanf(&buf[i * 16 + 7], "%4hx", &blue); | |
366 | sscanf(&buf[i * 16 + 11], "%4hx", &green); | |
367 | tsp = (buf[i * 16 + 2] != ' '); | |
368 | if ((rc = fb_info->fbops->fb_setcolreg(start++, | |
369 | red, green, blue, tsp, fb_info))) | |
370 | return rc; | |
371 | ||
372 | fb_info->cmap.red[i] = red; | |
373 | fb_info->cmap.blue[i] = blue; | |
374 | fb_info->cmap.green[i] = green; | |
375 | if (transp) | |
376 | fb_info->cmap.transp[i] = tsp; | |
377 | } | |
1da177e4 LT |
378 | return 0; |
379 | } | |
380 | ||
381 | static ssize_t show_cmap(struct class_device *class_device, char *buf) | |
382 | { | |
383 | struct fb_info *fb_info = | |
384 | (struct fb_info *)class_get_devdata(class_device); | |
d2102247 | 385 | unsigned int i; |
1da177e4 LT |
386 | |
387 | if (!fb_info->cmap.red || !fb_info->cmap.blue || | |
d2102247 JS |
388 | !fb_info->cmap.green) |
389 | return -EINVAL; | |
390 | ||
f0b9d796 | 391 | if (fb_info->cmap.len > PAGE_SIZE / 16) |
1da177e4 LT |
392 | return -EINVAL; |
393 | ||
d2102247 | 394 | /* don't mess with the format, the buffer is PAGE_SIZE */ |
f0b9d796 | 395 | /* 256 entries at 16 chars per line equals 4096 = PAGE_SIZE */ |
1da177e4 | 396 | for (i = 0; i < fb_info->cmap.len; i++) { |
f0b9d796 | 397 | snprintf(&buf[ i * 16], PAGE_SIZE - i * 16, "%02x%c%4x%4x%4x\n", i + fb_info->cmap.start, |
d2102247 JS |
398 | ((fb_info->cmap.transp && fb_info->cmap.transp[i]) ? '*' : ' '), |
399 | fb_info->cmap.red[i], fb_info->cmap.blue[i], | |
400 | fb_info->cmap.green[i]); | |
1da177e4 | 401 | } |
f0b9d796 | 402 | return 16 * fb_info->cmap.len; |
1da177e4 LT |
403 | } |
404 | ||
405 | static ssize_t store_blank(struct class_device *class_device, const char * buf, | |
406 | size_t count) | |
407 | { | |
408 | struct fb_info *fb_info = | |
409 | (struct fb_info *)class_get_devdata(class_device); | |
410 | char *last = NULL; | |
411 | int err; | |
412 | ||
413 | acquire_console_sem(); | |
414 | fb_info->flags |= FBINFO_MISC_USEREVENT; | |
415 | err = fb_blank(fb_info, simple_strtoul(buf, &last, 0)); | |
416 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
417 | release_console_sem(); | |
418 | if (err < 0) | |
419 | return err; | |
420 | return count; | |
421 | } | |
422 | ||
423 | static ssize_t show_blank(struct class_device *class_device, char *buf) | |
424 | { | |
425 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static ssize_t store_console(struct class_device *class_device, | |
430 | const char * buf, size_t count) | |
431 | { | |
432 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static ssize_t show_console(struct class_device *class_device, char *buf) | |
437 | { | |
438 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static ssize_t store_cursor(struct class_device *class_device, | |
443 | const char * buf, size_t count) | |
444 | { | |
445 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
446 | return 0; | |
447 | } | |
448 | ||
449 | static ssize_t show_cursor(struct class_device *class_device, char *buf) | |
450 | { | |
451 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
452 | return 0; | |
453 | } | |
454 | ||
455 | static ssize_t store_pan(struct class_device *class_device, const char * buf, | |
456 | size_t count) | |
457 | { | |
458 | struct fb_info *fb_info = | |
459 | (struct fb_info *)class_get_devdata(class_device); | |
460 | struct fb_var_screeninfo var; | |
461 | char *last = NULL; | |
462 | int err; | |
463 | ||
464 | var = fb_info->var; | |
465 | var.xoffset = simple_strtoul(buf, &last, 0); | |
466 | last++; | |
467 | if (last - buf >= count) | |
468 | return -EINVAL; | |
469 | var.yoffset = simple_strtoul(last, &last, 0); | |
470 | ||
471 | acquire_console_sem(); | |
472 | err = fb_pan_display(fb_info, &var); | |
473 | release_console_sem(); | |
474 | ||
475 | if (err < 0) | |
476 | return err; | |
477 | return count; | |
478 | } | |
479 | ||
480 | static ssize_t show_pan(struct class_device *class_device, char *buf) | |
481 | { | |
482 | struct fb_info *fb_info = | |
483 | (struct fb_info *)class_get_devdata(class_device); | |
484 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, | |
485 | fb_info->var.xoffset); | |
486 | } | |
487 | ||
02459eaa JS |
488 | static ssize_t show_name(struct class_device *class_device, char *buf) |
489 | { | |
490 | struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
491 | ||
492 | return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id); | |
493 | } | |
494 | ||
75c96f85 | 495 | static struct class_device_attribute class_device_attrs[] = { |
1da177e4 LT |
496 | __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp), |
497 | __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank), | |
498 | __ATTR(color_map, S_IRUGO|S_IWUSR, show_cmap, store_cmap), | |
499 | __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console), | |
500 | __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor), | |
501 | __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode), | |
502 | __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes), | |
503 | __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan), | |
504 | __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual), | |
02459eaa | 505 | __ATTR(name, S_IRUGO, show_name, NULL), |
c14e2cfc | 506 | __ATTR(stride, S_IRUGO, show_stride, NULL), |
a812c94b AD |
507 | __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate), |
508 | __ATTR(con_rotate, S_IRUGO|S_IWUSR, show_con_rotate, store_con_rotate), | |
509 | __ATTR(con_rotate_all, S_IWUSR, NULL, store_con_rotate_all), | |
1da177e4 LT |
510 | }; |
511 | ||
512 | int fb_init_class_device(struct fb_info *fb_info) | |
513 | { | |
514 | unsigned int i; | |
515 | class_set_devdata(fb_info->class_device, fb_info); | |
516 | ||
517 | for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) | |
518 | class_device_create_file(fb_info->class_device, | |
519 | &class_device_attrs[i]); | |
520 | return 0; | |
521 | } | |
522 | ||
523 | void fb_cleanup_class_device(struct fb_info *fb_info) | |
524 | { | |
525 | unsigned int i; | |
526 | ||
527 | for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) | |
528 | class_device_remove_file(fb_info->class_device, | |
529 | &class_device_attrs[i]); | |
530 | } | |
531 | ||
532 |