Merge branch 'upstream'
[linux-2.6] / drivers / video / fbsysfs.c
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
232         if ((err = activate(fb_info, &var)))
233                 return err;
234         return count;
235 }
236
237 static ssize_t show_virtual(struct class_device *class_device, char *buf)
238 {
239         struct fb_info *fb_info =
240                 (struct fb_info *)class_get_devdata(class_device);
241         return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
242                         fb_info->var.yres_virtual);
243 }
244
245 static ssize_t show_stride(struct class_device *class_device, char *buf)
246 {
247         struct fb_info *fb_info =
248                 (struct fb_info *)class_get_devdata(class_device);
249         return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
250 }
251
252 /* Format for cmap is "%02x%c%4x%4x%4x\n" */
253 /* %02x entry %c transp %4x red %4x blue %4x green \n */
254 /* 256 rows at 16 chars equals 4096, the normal page size */
255 /* the code will automatically adjust for different page sizes */
256 static ssize_t store_cmap(struct class_device *class_device, const char *buf,
257                           size_t count)
258 {
259         struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
260         int rc, i, start, length, transp = 0;
261
262         if ((count > PAGE_SIZE) || ((count % 16) != 0))
263                 return -EINVAL;
264
265         if (!fb_info->fbops->fb_setcolreg && !fb_info->fbops->fb_setcmap)
266                 return -EINVAL;
267
268         sscanf(buf, "%02x", &start);
269         length = count / 16;
270
271         for (i = 0; i < length; i++)
272                 if (buf[i * 16 + 2] != ' ')
273                         transp = 1;
274
275         /* If we can batch, do it */
276         if (fb_info->fbops->fb_setcmap && length > 1) {
277                 struct fb_cmap umap;
278
279                 memset(&umap, 0, sizeof(umap));
280                 if ((rc = fb_alloc_cmap(&umap, length, transp)))
281                         return rc;
282
283                 umap.start = start;
284                 for (i = 0; i < length; i++) {
285                         sscanf(&buf[i * 16 +  3], "%4hx", &umap.red[i]);
286                         sscanf(&buf[i * 16 +  7], "%4hx", &umap.blue[i]);
287                         sscanf(&buf[i * 16 + 11], "%4hx", &umap.green[i]);
288                         if (transp)
289                                 umap.transp[i] = (buf[i * 16 +  2] != ' ');
290                 }
291                 rc = fb_info->fbops->fb_setcmap(&umap, fb_info);
292                 fb_copy_cmap(&umap, &fb_info->cmap);
293                 fb_dealloc_cmap(&umap);
294
295                 return rc;
296         }
297         for (i = 0; i < length; i++) {
298                 u16 red, blue, green, tsp;
299
300                 sscanf(&buf[i * 16 +  3], "%4hx", &red);
301                 sscanf(&buf[i * 16 +  7], "%4hx", &blue);
302                 sscanf(&buf[i * 16 + 11], "%4hx", &green);
303                 tsp = (buf[i * 16 +  2] != ' ');
304                 if ((rc = fb_info->fbops->fb_setcolreg(start++,
305                                       red, green, blue, tsp, fb_info)))
306                         return rc;
307
308                 fb_info->cmap.red[i] = red;
309                 fb_info->cmap.blue[i] = blue;
310                 fb_info->cmap.green[i] = green;
311                 if (transp)
312                         fb_info->cmap.transp[i] = tsp;
313         }
314         return 0;
315 }
316
317 static ssize_t show_cmap(struct class_device *class_device, char *buf)
318 {
319         struct fb_info *fb_info =
320                 (struct fb_info *)class_get_devdata(class_device);
321         unsigned int i;
322
323         if (!fb_info->cmap.red || !fb_info->cmap.blue ||
324            !fb_info->cmap.green)
325                 return -EINVAL;
326
327         if (fb_info->cmap.len > PAGE_SIZE / 16)
328                 return -EINVAL;
329
330         /* don't mess with the format, the buffer is PAGE_SIZE */
331         /* 256 entries at 16 chars per line equals 4096 = PAGE_SIZE */
332         for (i = 0; i < fb_info->cmap.len; i++) {
333                 snprintf(&buf[ i * 16], PAGE_SIZE - i * 16, "%02x%c%4x%4x%4x\n", i + fb_info->cmap.start,
334                         ((fb_info->cmap.transp && fb_info->cmap.transp[i]) ? '*' : ' '),
335                         fb_info->cmap.red[i], fb_info->cmap.blue[i],
336                         fb_info->cmap.green[i]);
337         }
338         return 16 * fb_info->cmap.len;
339 }
340
341 static ssize_t store_blank(struct class_device *class_device, const char * buf,
342                            size_t count)
343 {
344         struct fb_info *fb_info =
345                 (struct fb_info *)class_get_devdata(class_device);
346         char *last = NULL;
347         int err;
348
349         acquire_console_sem();
350         fb_info->flags |= FBINFO_MISC_USEREVENT;
351         err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
352         fb_info->flags &= ~FBINFO_MISC_USEREVENT;
353         release_console_sem();
354         if (err < 0)
355                 return err;
356         return count;
357 }
358
359 static ssize_t show_blank(struct class_device *class_device, char *buf)
360 {
361 //      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
362         return 0;
363 }
364
365 static ssize_t store_console(struct class_device *class_device,
366                              const char * buf, size_t count)
367 {
368 //      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
369         return 0;
370 }
371
372 static ssize_t show_console(struct class_device *class_device, char *buf)
373 {
374 //      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
375         return 0;
376 }
377
378 static ssize_t store_cursor(struct class_device *class_device,
379                             const char * buf, size_t count)
380 {
381 //      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
382         return 0;
383 }
384
385 static ssize_t show_cursor(struct class_device *class_device, char *buf)
386 {
387 //      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
388         return 0;
389 }
390
391 static ssize_t store_pan(struct class_device *class_device, const char * buf,
392                          size_t count)
393 {
394         struct fb_info *fb_info =
395                 (struct fb_info *)class_get_devdata(class_device);
396         struct fb_var_screeninfo var;
397         char *last = NULL;
398         int err;
399
400         var = fb_info->var;
401         var.xoffset = simple_strtoul(buf, &last, 0);
402         last++;
403         if (last - buf >= count)
404                 return -EINVAL;
405         var.yoffset = simple_strtoul(last, &last, 0);
406
407         acquire_console_sem();
408         err = fb_pan_display(fb_info, &var);
409         release_console_sem();
410
411         if (err < 0)
412                 return err;
413         return count;
414 }
415
416 static ssize_t show_pan(struct class_device *class_device, char *buf)
417 {
418         struct fb_info *fb_info =
419                 (struct fb_info *)class_get_devdata(class_device);
420         return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
421                         fb_info->var.xoffset);
422 }
423
424 static ssize_t show_name(struct class_device *class_device, char *buf)
425 {
426         struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
427
428         return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
429 }
430
431 static struct class_device_attribute class_device_attrs[] = {
432         __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
433         __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
434         __ATTR(color_map, S_IRUGO|S_IWUSR, show_cmap, store_cmap),
435         __ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console),
436         __ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor),
437         __ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode),
438         __ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes),
439         __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan),
440         __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual),
441         __ATTR(name, S_IRUGO, show_name, NULL),
442         __ATTR(stride, S_IRUGO, show_stride, NULL),
443 };
444
445 int fb_init_class_device(struct fb_info *fb_info)
446 {
447         unsigned int i;
448         class_set_devdata(fb_info->class_device, fb_info);
449
450         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
451                 class_device_create_file(fb_info->class_device,
452                                          &class_device_attrs[i]);
453         return 0;
454 }
455
456 void fb_cleanup_class_device(struct fb_info *fb_info)
457 {
458         unsigned int i;
459
460         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
461                 class_device_remove_file(fb_info->class_device,
462                                          &class_device_attrs[i]);
463 }
464
465