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