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> | |
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 | ||
216 | static ssize_t store_virtual(struct class_device *class_device, | |
217 | const char * buf, size_t count) | |
218 | { | |
219 | struct fb_info *fb_info = | |
220 | (struct fb_info *)class_get_devdata(class_device); | |
221 | struct fb_var_screeninfo var; | |
222 | char *last = NULL; | |
223 | int err; | |
224 | ||
225 | var = fb_info->var; | |
226 | var.xres_virtual = simple_strtoul(buf, &last, 0); | |
227 | last++; | |
228 | if (last - buf >= count) | |
229 | return -EINVAL; | |
230 | var.yres_virtual = simple_strtoul(last, &last, 0); | |
231 | printk(KERN_ERR "fb: xres %d yres %d\n", var.xres_virtual, | |
232 | var.yres_virtual); | |
233 | ||
234 | if ((err = activate(fb_info, &var))) | |
235 | return err; | |
236 | return count; | |
237 | } | |
238 | ||
239 | static ssize_t show_virtual(struct class_device *class_device, char *buf) | |
240 | { | |
241 | struct fb_info *fb_info = | |
242 | (struct fb_info *)class_get_devdata(class_device); | |
243 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, | |
244 | fb_info->var.xres_virtual); | |
245 | } | |
246 | ||
247 | static ssize_t store_cmap(struct class_device *class_device, const char * buf, | |
248 | size_t count) | |
249 | { | |
250 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static ssize_t show_cmap(struct class_device *class_device, char *buf) | |
255 | { | |
256 | struct fb_info *fb_info = | |
257 | (struct fb_info *)class_get_devdata(class_device); | |
258 | unsigned int offset = 0, i; | |
259 | ||
260 | if (!fb_info->cmap.red || !fb_info->cmap.blue || | |
261 | fb_info->cmap.green || fb_info->cmap.transp) | |
262 | return -EINVAL; | |
263 | ||
264 | for (i = 0; i < fb_info->cmap.len; i++) { | |
265 | offset += snprintf(buf, PAGE_SIZE - offset, | |
266 | "%d,%d,%d,%d,%d\n", i + fb_info->cmap.start, | |
267 | fb_info->cmap.red[i], fb_info->cmap.blue[i], | |
268 | fb_info->cmap.green[i], | |
269 | fb_info->cmap.transp[i]); | |
270 | } | |
271 | return offset; | |
272 | } | |
273 | ||
274 | static ssize_t store_blank(struct class_device *class_device, const char * buf, | |
275 | size_t count) | |
276 | { | |
277 | struct fb_info *fb_info = | |
278 | (struct fb_info *)class_get_devdata(class_device); | |
279 | char *last = NULL; | |
280 | int err; | |
281 | ||
282 | acquire_console_sem(); | |
283 | fb_info->flags |= FBINFO_MISC_USEREVENT; | |
284 | err = fb_blank(fb_info, simple_strtoul(buf, &last, 0)); | |
285 | fb_info->flags &= ~FBINFO_MISC_USEREVENT; | |
286 | release_console_sem(); | |
287 | if (err < 0) | |
288 | return err; | |
289 | return count; | |
290 | } | |
291 | ||
292 | static ssize_t show_blank(struct class_device *class_device, char *buf) | |
293 | { | |
294 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static ssize_t store_console(struct class_device *class_device, | |
299 | const char * buf, size_t count) | |
300 | { | |
301 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static ssize_t show_console(struct class_device *class_device, char *buf) | |
306 | { | |
307 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static ssize_t store_cursor(struct class_device *class_device, | |
312 | const char * buf, size_t count) | |
313 | { | |
314 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
315 | return 0; | |
316 | } | |
317 | ||
318 | static ssize_t show_cursor(struct class_device *class_device, char *buf) | |
319 | { | |
320 | // struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | static ssize_t store_pan(struct class_device *class_device, const char * buf, | |
325 | size_t count) | |
326 | { | |
327 | struct fb_info *fb_info = | |
328 | (struct fb_info *)class_get_devdata(class_device); | |
329 | struct fb_var_screeninfo var; | |
330 | char *last = NULL; | |
331 | int err; | |
332 | ||
333 | var = fb_info->var; | |
334 | var.xoffset = simple_strtoul(buf, &last, 0); | |
335 | last++; | |
336 | if (last - buf >= count) | |
337 | return -EINVAL; | |
338 | var.yoffset = simple_strtoul(last, &last, 0); | |
339 | ||
340 | acquire_console_sem(); | |
341 | err = fb_pan_display(fb_info, &var); | |
342 | release_console_sem(); | |
343 | ||
344 | if (err < 0) | |
345 | return err; | |
346 | return count; | |
347 | } | |
348 | ||
349 | static ssize_t show_pan(struct class_device *class_device, char *buf) | |
350 | { | |
351 | struct fb_info *fb_info = | |
352 | (struct fb_info *)class_get_devdata(class_device); | |
353 | return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, | |
354 | fb_info->var.xoffset); | |
355 | } | |
356 | ||
357 | struct class_device_attribute class_device_attrs[] = { | |
358 | __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp), | |
359 | __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank), | |
360 | __ATTR(color_map, S_IRUGO|S_IWUSR, show_cmap, store_cmap), | |
361 | __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console), | |
362 | __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor), | |
363 | __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode), | |
364 | __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes), | |
365 | __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan), | |
366 | __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual), | |
367 | }; | |
368 | ||
369 | int fb_init_class_device(struct fb_info *fb_info) | |
370 | { | |
371 | unsigned int i; | |
372 | class_set_devdata(fb_info->class_device, fb_info); | |
373 | ||
374 | for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) | |
375 | class_device_create_file(fb_info->class_device, | |
376 | &class_device_attrs[i]); | |
377 | return 0; | |
378 | } | |
379 | ||
380 | void fb_cleanup_class_device(struct fb_info *fb_info) | |
381 | { | |
382 | unsigned int i; | |
383 | ||
384 | for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) | |
385 | class_device_remove_file(fb_info->class_device, | |
386 | &class_device_attrs[i]); | |
387 | } | |
388 | ||
389 |