[PATCH] s390: enable write barriers in the dasd driver
[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         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