git.oblomov.eu Git - linux-2.6/blob - drivers/staging/asus_oled/asus_oled.c

   1 /*
   2  *  Asus OLED USB driver
   3  *
   4  *  Copyright (C) 2007,2008 Jakub Schmidtke (sjakub@gmail.com)
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  *
  22  *
  23  *  This module is based on usbled and asus-laptop modules.
  24  *
  25  *
  26  *  Asus OLED support is based on asusoled program taken from
  27  *  https://launchpad.net/asusoled/.
  28  *
  29  *
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/errno.h>
  34 #include <linux/init.h>
  35 #include <linux/slab.h>
  36 #include <linux/module.h>
  37 #include <linux/usb.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/ctype.h>
  40
  41 #define ASUS_OLED_VERSION               "0.04-dev"
  42 #define ASUS_OLED_NAME                  "asus-oled"
  43 #define ASUS_OLED_UNDERSCORE_NAME       "asus_oled"
  44
  45 #define ASUS_OLED_ERROR                 "Asus OLED Display Error: "
  46
  47 #define ASUS_OLED_STATIC                's'
  48 #define ASUS_OLED_ROLL                  'r'
  49 #define ASUS_OLED_FLASH                 'f'
  50
  51 #define ASUS_OLED_MAX_WIDTH             1792
  52 #define ASUS_OLED_DISP_HEIGHT           32
  53 #define ASUS_OLED_PACKET_BUF_SIZE       256
  54
  55 MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
  56 MODULE_DESCRIPTION("Asus OLED Driver v" ASUS_OLED_VERSION);
  57 MODULE_LICENSE("GPL");
  58
  59 static struct class *oled_class = 0;
  60 static int oled_num = 0;
  61
  62 static uint start_off = 0;
  63
  64 module_param(start_off, uint, 0644);
  65
  66 MODULE_PARM_DESC(start_off, "Set to 1 to switch off OLED display after it is attached");
  67
  68 typedef enum {
  69         PACK_MODE_G1,
  70         PACK_MODE_G50,
  71         PACK_MODE_LAST
  72 } oled_pack_mode_t;
  73
  74 struct oled_dev_desc_str {
  75         uint16_t                idVendor;
  76         uint16_t                idProduct;
  77         uint16_t                devWidth; // width of display
  78         oled_pack_mode_t        packMode; // formula to be used while packing the picture
  79         const char              *devDesc;
  80 };
  81
  82 /* table of devices that work with this driver */
  83 static struct usb_device_id id_table [] = {
  84         { USB_DEVICE(0x0b05, 0x1726) }, // Asus G1/G2 (and variants)
  85         { USB_DEVICE(0x0b05, 0x175b) }, // Asus G50V (and possibly others - G70? G71?)
  86         { },
  87 };
  88
  89 /* parameters of specific devices */
  90 static struct oled_dev_desc_str oled_dev_desc_table [] = {
  91         { 0x0b05, 0x1726, 128, PACK_MODE_G1, "G1/G2" },
  92         { 0x0b05, 0x175b, 256, PACK_MODE_G50, "G50" },
  93         { },
  94 };
  95
  96 MODULE_DEVICE_TABLE (usb, id_table);
  97
  98 #define SETUP_PACKET_HEADER(packet, val1, val2, val3, val4, val5, val6, val7) \
  99         do {                                    \
 100                 memset(packet, 0, sizeof(struct asus_oled_header));             \
 101                 packet->header.magic1 = 0x55;           \
 102                 packet->header.magic2 = 0xaa;           \
 103                 packet->header.flags = val1;            \
 104                 packet->header.value3 = val2;           \
 105                 packet->header.buffer1 = val3;          \
 106                 packet->header.buffer2 = val4;          \
 107                 packet->header.value6 = val5;           \
 108                 packet->header.value7 = val6;           \
 109                 packet->header.value8 = val7;           \
 110         } while(0);
 111
 112 struct asus_oled_header {
 113         uint8_t         magic1;
 114         uint8_t         magic2;
 115         uint8_t         flags;
 116         uint8_t         value3;
 117         uint8_t         buffer1;
 118         uint8_t         buffer2;
 119         uint8_t         value6;
 120         uint8_t         value7;
 121         uint8_t         value8;
 122         uint8_t         padding2[7];
 123 } __attribute((packed));
 124
 125 struct asus_oled_packet {
 126         struct asus_oled_header         header;
 127         uint8_t                         bitmap[ASUS_OLED_PACKET_BUF_SIZE];
 128 } __attribute((packed));
 129
 130 struct asus_oled_dev {
 131         struct usb_device *     udev;
 132         uint8_t                 pic_mode;
 133         uint16_t                dev_width;
 134         oled_pack_mode_t        pack_mode;
 135         size_t                  height;
 136         size_t                  width;
 137         size_t                  x_shift;
 138         size_t                  y_shift;
 139         size_t                  buf_offs;
 140         uint8_t                 last_val;
 141         size_t                  buf_size;
 142         char                    *buf;
 143         uint8_t                 enabled;
 144         struct device           *dev;
 145 };
 146
 147 static void enable_oled(struct asus_oled_dev *odev, uint8_t enabl)
 148 {
 149         int a;
 150         int retval;
 151         int act_len;
 152         struct asus_oled_packet * packet;
 153
 154         packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
 155
 156         if (!packet) {
 157                 dev_err(&odev->udev->dev, "out of memory\n");
 158                 return;
 159         }
 160
 161         SETUP_PACKET_HEADER(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
 162
 163         if (enabl) packet->bitmap[0] = 0xaf;
 164         else packet->bitmap[0] = 0xae;
 165
 166         for (a=0; a<1; a++) {
 167                 retval = usb_bulk_msg(odev->udev,
 168                         usb_sndbulkpipe(odev->udev, 2),
 169                         packet,
 170                         sizeof(struct asus_oled_header) + 1,
 171                         &act_len,
 172                         -1);
 173
 174                 if (retval)
 175                         dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
 176         }
 177
 178         odev->enabled = enabl;
 179
 180         kfree(packet);
 181 }
 182
 183 static ssize_t set_enabled(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 184 {
 185         struct usb_interface *intf = to_usb_interface(dev);
 186         struct asus_oled_dev *odev = usb_get_intfdata(intf);
 187         int temp = simple_strtoul(buf, NULL, 10);
 188
 189         enable_oled(odev, temp);
 190
 191         return count;
 192 }
 193
 194 static ssize_t class_set_enabled(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
 195 {
 196         struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
 197
 198         int temp = simple_strtoul(buf, NULL, 10);
 199
 200         enable_oled(odev, temp);
 201
 202         return count;
 203 }
 204
 205 static ssize_t get_enabled(struct device *dev, struct device_attribute *attr, char *buf)
 206 {
 207         struct usb_interface *intf = to_usb_interface(dev);
 208         struct asus_oled_dev *odev = usb_get_intfdata(intf);
 209
 210         return sprintf(buf, "%d\n", odev->enabled);
 211 }
 212
 213 static ssize_t class_get_enabled(struct device *device, struct device_attribute *attr, char *buf)
 214 {
 215         struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
 216
 217         return sprintf(buf, "%d\n", odev->enabled);
 218 }
 219
 220 static void send_packets(struct usb_device *udev, struct asus_oled_packet *packet,
 221         char *buf, uint8_t p_type, size_t p_num)
 222 {
 223         size_t i;
 224         int act_len;
 225
 226         for (i = 0; i < p_num; i++) {
 227                 int retval;
 228
 229                 switch (p_type) {
 230                         case ASUS_OLED_ROLL:
 231                                 SETUP_PACKET_HEADER(packet, 0x40, 0x80, p_num, i + 1, 0x00, 0x01, 0xff);
 232                         break;
 233                         case ASUS_OLED_STATIC:
 234                                 SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x01, 0x00);
 235                         break;
 236                         case ASUS_OLED_FLASH:
 237                                 SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x00, 0xff);
 238                         break;
 239                 }
 240
 241                 memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i), ASUS_OLED_PACKET_BUF_SIZE);
 242
 243                 retval = usb_bulk_msg(udev,
 244                         usb_sndctrlpipe(udev, 2),
 245                         packet,
 246                         sizeof(struct asus_oled_packet),
 247                         &act_len,
 248                         -1);
 249
 250                 if (retval)
 251                         dev_dbg(&udev->dev, "retval = %d\n", retval);
 252         }
 253 }
 254
 255 static void send_packet(struct usb_device *udev, struct asus_oled_packet *packet, size_t offset, size_t len, char *buf, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5, uint8_t b6){
 256         int retval;
 257         int act_len;
 258
 259         SETUP_PACKET_HEADER(packet, b1, b2, b3, b4, b5, b6, 0x00);
 260         memcpy(packet->bitmap, buf + offset, len);
 261
 262         retval = usb_bulk_msg(udev,
 263                         usb_sndctrlpipe(udev, 2),
 264                         packet,
 265                         sizeof(struct asus_oled_packet),
 266                         &act_len,
 267                         -1);
 268
 269         if (retval)
 270                 dev_dbg(&udev->dev, "retval = %d\n", retval);
 271 }
 272
 273
 274 static void send_packets_g50(struct usb_device *udev, struct asus_oled_packet *packet, char *buf)
 275 {
 276         send_packet(udev, packet,     0, 0x100, buf, 0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
 277         send_packet(udev, packet, 0x100, 0x080, buf, 0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
 278
 279         send_packet(udev, packet, 0x180, 0x100, buf, 0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
 280         send_packet(udev, packet, 0x280, 0x100, buf, 0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
 281         send_packet(udev, packet, 0x380, 0x080, buf, 0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
 282 }
 283
 284
 285 static void send_data(struct asus_oled_dev *odev)
 286 {
 287         size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
 288         struct asus_oled_packet * packet;
 289
 290         packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
 291
 292         if (!packet) {
 293                 dev_err(&odev->udev->dev, "out of memory\n");
 294                 return;
 295         }
 296
 297         if (odev->pack_mode==PACK_MODE_G1){
 298                 // When sending roll-mode data the display updated only first packet.
 299                 // I have no idea why, but when static picture is send just before
 300                 // rolling picture - everything works fine.
 301                 if (odev->pic_mode == ASUS_OLED_ROLL)
 302                         send_packets(odev->udev, packet, odev->buf, ASUS_OLED_STATIC, 2);
 303
 304                 // Only ROLL mode can use more than 2 packets.
 305                 if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
 306                         packet_num = 2;
 307
 308                 send_packets(odev->udev, packet, odev->buf, odev->pic_mode, packet_num);
 309         }
 310         else
 311         if (odev->pack_mode==PACK_MODE_G50){
 312                 send_packets_g50(odev->udev, packet, odev->buf);
 313         }
 314
 315         kfree(packet);
 316 }
 317
 318 static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
 319 {
 320         while (count-- > 0) {
 321                 if (val) {
 322                         size_t x = odev->buf_offs % odev->width;
 323                         size_t y = odev->buf_offs / odev->width;
 324                         size_t i;
 325
 326                         x += odev->x_shift;
 327                         y += odev->y_shift;
 328
 329                         switch(odev->pack_mode)
 330                         {
 331                                 case PACK_MODE_G1:
 332                                         // i = (x/128)*640 + 127 - x + (y/8)*128;
 333                                         // This one for 128 is the same, but might be better for different widths?
 334                                         i = (x/odev->dev_width)*640 + odev->dev_width - 1 - x + (y/8)*odev->dev_width;
 335                                 break;
 336
 337                                 case PACK_MODE_G50:
 338                                         i =  (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
 339                                 break;
 340
 341                                 default:
 342                                         i = 0;
 343                                         printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n", odev->pack_mode);
 344                                 break;
 345                         }
 346
 347                         if (i >= odev->buf_size) {
 348                                 printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug in the driver: offs: %d >= %d i: %d (x: %d y: %d)\n",
 349                                         (int) odev->buf_offs, (int) odev->buf_size, (int) i, (int) x, (int) y);
 350                                 return -EIO;
 351                         }
 352
 353                         switch (odev->pack_mode)
 354                         {
 355                                 case PACK_MODE_G1:
 356                                         odev->buf[i] &= ~(1<<(y%8));
 357                                 break;
 358
 359                                 case PACK_MODE_G50:
 360                                         odev->buf[i] &= ~(1<<(x%8));
 361                                 break;
 362
 363                                 default:
 364                                         // cannot get here; stops gcc complaining
 365                                 ;
 366                         }
 367                 }
 368
 369                 odev->last_val = val;
 370                 odev->buf_offs++;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static ssize_t odev_set_picture(struct asus_oled_dev *odev, const char *buf, size_t count)
 377 {
 378         size_t offs = 0, max_offs;
 379
 380         if (count < 1) return 0;
 381
 382         if (tolower(buf[0]) == 'b'){
 383             // binary mode, set the entire memory
 384
 385             size_t i;
 386
 387             odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
 388
 389             if (odev->buf) kfree(odev->buf);
 390             odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 391
 392             memset(odev->buf, 0xff, odev->buf_size);
 393
 394             for (i=1; i < count && i<=32*32; i++){
 395                 odev->buf[i-1] = buf[i];
 396                 odev->buf_offs = i-1;
 397             }
 398
 399             odev->width=odev->dev_width / 8;
 400             odev->height=ASUS_OLED_DISP_HEIGHT;
 401             odev->x_shift=0;
 402             odev->y_shift=0;
 403             odev->last_val=0;
 404
 405             send_data(odev);
 406
 407             return count;
 408         }
 409
 410         if (buf[0] == '<') {
 411                 size_t i;
 412                 size_t w = 0, h = 0;
 413                 size_t w_mem, h_mem;
 414
 415                 if (count < 10 || buf[2] != ':') {
 416                         goto error_header;
 417                 }
 418
 419                 switch(tolower(buf[1])) {
 420                         case ASUS_OLED_STATIC:
 421                         case ASUS_OLED_ROLL:
 422                         case ASUS_OLED_FLASH:
 423                                 odev->pic_mode = buf[1];
 424                                 break;
 425                         default:
 426                                 printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n", buf[1]);
 427                                 return -EIO;
 428                                 break;
 429                 }
 430
 431                 for (i = 3; i < count; ++i) {
 432                         if (buf[i] >= '0' && buf[i] <= '9') {
 433                                 w = 10*w + (buf[i] - '0');
 434
 435                                 if (w > ASUS_OLED_MAX_WIDTH) goto error_width;
 436                         }
 437                         else if (tolower(buf[i]) == 'x') break;
 438                         else goto error_width;
 439                 }
 440
 441                 for (++i; i < count; ++i) {
 442                         if (buf[i] >= '0' && buf[i] <= '9') {
 443                                 h = 10*h + (buf[i] - '0');
 444
 445                                 if (h > ASUS_OLED_DISP_HEIGHT) goto error_height;
 446                         }
 447                         else if (tolower(buf[i]) == '>') break;
 448                         else goto error_height;
 449                 }
 450
 451                 if (w < 1 || w > ASUS_OLED_MAX_WIDTH) goto error_width;
 452
 453                 if (h < 1 || h > ASUS_OLED_DISP_HEIGHT) goto error_height;
 454
 455                 if (i >= count || buf[i] != '>') goto error_header;
 456
 457                 offs = i+1;
 458
 459                 if (w % (odev->dev_width) != 0)
 460                         w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
 461                 else
 462                         w_mem = w;
 463
 464                 if (h < ASUS_OLED_DISP_HEIGHT)
 465                         h_mem = ASUS_OLED_DISP_HEIGHT;
 466                 else
 467                         h_mem = h;
 468
 469                 odev->buf_size = w_mem * h_mem / 8;
 470
 471                 if (odev->buf) kfree(odev->buf);
 472                 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 473
 474                 if (odev->buf == NULL) {
 475                         odev->buf_size = 0;
 476                         printk(ASUS_OLED_ERROR "Out of memory!\n");
 477                         return -ENOMEM;
 478                 }
 479
 480                 memset(odev->buf, 0xff, odev->buf_size);
 481
 482                 odev->buf_offs = 0;
 483                 odev->width = w;
 484                 odev->height = h;
 485                 odev->x_shift = 0;
 486                 odev->y_shift = 0;
 487                 odev->last_val = 0;
 488
 489                 if (odev->pic_mode == ASUS_OLED_FLASH) {
 490                         if (h < ASUS_OLED_DISP_HEIGHT/2)
 491                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
 492                 }
 493                 else {
 494                         if (h < ASUS_OLED_DISP_HEIGHT)
 495                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
 496                 }
 497
 498                 if (w < (odev->dev_width))
 499                         odev->x_shift = ((odev->dev_width) - w)/2;
 500         }
 501
 502         max_offs = odev->width * odev->height;
 503
 504         while (offs < count && odev->buf_offs < max_offs) {
 505                 int ret;
 506
 507                 if (buf[offs] == '1' || buf[offs] == '#') {
 508                         if ( (ret = append_values(odev, 1, 1)) < 0) return ret;
 509                 }
 510                 else if (buf[offs] == '0' || buf[offs] == ' ') {
 511                         if ( (ret = append_values(odev, 0, 1)) < 0) return ret;
 512                 }
 513                 else if (buf[offs] == '\n') {
 514                         // New line detected. Lets assume, that all characters till the end of the
 515                         // line were equal to the last character in this line.
 516                         if (odev->buf_offs % odev->width != 0)
 517                                 if ( (ret = append_values(odev, odev->last_val,
 518                                       odev->width - (odev->buf_offs % odev->width))) < 0) return ret;
 519                 }
 520
 521                 offs++;
 522         }
 523
 524         if (odev->buf_offs >= max_offs) send_data(odev);
 525
 526         return count;
 527
 528 error_width:
 529         printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
 530         return -EIO;
 531
 532 error_height:
 533         printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
 534         return -EIO;
 535
 536 error_header:
 537         printk(ASUS_OLED_ERROR "Wrong picture header.\n");
 538         return -EIO;
 539 }
 540
 541 static ssize_t set_picture(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 542 {
 543         struct usb_interface *intf = to_usb_interface(dev);
 544
 545         return odev_set_picture(usb_get_intfdata(intf), buf, count);
 546 }
 547
 548 static ssize_t class_set_picture(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
 549 {
 550         return odev_set_picture((struct asus_oled_dev *) dev_get_drvdata(device), buf, count);
 551 }
 552
 553 #define ASUS_OLED_DEVICE_ATTR(_file)            dev_attr_asus_oled_##_file
 554
 555 static DEVICE_ATTR(asus_oled_enabled, S_IWUGO | S_IRUGO, get_enabled, set_enabled);
 556 static DEVICE_ATTR(asus_oled_picture, S_IWUGO , NULL, set_picture);
 557
 558 static DEVICE_ATTR(enabled, S_IWUGO | S_IRUGO, class_get_enabled, class_set_enabled);
 559 static DEVICE_ATTR(picture, S_IWUGO, NULL, class_set_picture);
 560
 561 static int asus_oled_probe(struct usb_interface *interface, const struct usb_device_id *id)
 562 {
 563         struct usb_device *udev = interface_to_usbdev(interface);
 564         struct asus_oled_dev *odev = NULL;
 565         int retval = -ENOMEM;
 566         uint16_t dev_width = 0;
 567         oled_pack_mode_t pack_mode = PACK_MODE_LAST;
 568         const struct oled_dev_desc_str * dev_desc = oled_dev_desc_table;
 569         const char *desc = 0;
 570
 571         if (id == 0) {
 572                 // Even possible? Just to make sure...
 573                 dev_err(&interface->dev, "No usb_device_id provided!\n");
 574                 return -ENODEV;
 575         }
 576
 577         for (; dev_desc->idVendor; dev_desc++)
 578         {
 579                 if (dev_desc->idVendor == id->idVendor
 580                         && dev_desc->idProduct == id->idProduct)
 581                 {
 582                         dev_width = dev_desc->devWidth;
 583                         desc = dev_desc->devDesc;
 584                         pack_mode = dev_desc->packMode;
 585                         break;
 586                 }
 587         }
 588
 589         if ( !desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
 590                 dev_err(&interface->dev, "Missing or incomplete device description!\n");
 591                 return -ENODEV;
 592         }
 593
 594         odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
 595
 596         if (odev == NULL) {
 597                 dev_err(&interface->dev, "Out of memory\n");
 598                 return -ENOMEM;
 599         }
 600
 601         odev->udev = usb_get_dev(udev);
 602         odev->pic_mode = ASUS_OLED_STATIC;
 603         odev->dev_width = dev_width;
 604         odev->pack_mode = pack_mode;
 605         odev->height = 0;
 606         odev->width = 0;
 607         odev->x_shift = 0;
 608         odev->y_shift = 0;
 609         odev->buf_offs = 0;
 610         odev->buf_size = 0;
 611         odev->last_val = 0;
 612         odev->buf = NULL;
 613         odev->enabled = 1;
 614         odev->dev = 0;
 615
 616         usb_set_intfdata (interface, odev);
 617
 618         if ((retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled)))) {
 619                 goto err_files;
 620         }
 621
 622         if ((retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture)))) {
 623                 goto err_files;
 624         }
 625
 626         odev->dev = device_create(oled_class, &interface->dev, MKDEV(0,0),
 627                                 NULL,"oled_%d", ++oled_num);
 628
 629         if (IS_ERR(odev->dev)) {
 630                 retval = PTR_ERR(odev->dev);
 631                 goto err_files;
 632         }
 633
 634         dev_set_drvdata(odev->dev, odev);
 635
 636         if ( (retval = device_create_file(odev->dev, &dev_attr_enabled))) {
 637                 goto err_class_enabled;
 638         }
 639
 640         if ( (retval = device_create_file(odev->dev, &dev_attr_picture))) {
 641                 goto err_class_picture;
 642         }
 643
 644         dev_info(&interface->dev, "Attached Asus OLED device: %s [width %u, pack_mode %d]\n", desc, odev->dev_width, odev->pack_mode);
 645
 646         if (start_off)
 647                 enable_oled(odev, 0);
 648
 649         return 0;
 650
 651 err_class_picture:
 652         device_remove_file(odev->dev, &dev_attr_picture);
 653
 654 err_class_enabled:
 655         device_remove_file(odev->dev, &dev_attr_enabled);
 656         device_unregister(odev->dev);
 657
 658 err_files:
 659         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
 660         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
 661
 662         usb_set_intfdata (interface, NULL);
 663         usb_put_dev(odev->udev);
 664         kfree(odev);
 665
 666         return retval;
 667 }
 668
 669 static void asus_oled_disconnect(struct usb_interface *interface)
 670 {
 671         struct asus_oled_dev *odev;
 672
 673         odev = usb_get_intfdata (interface);
 674         usb_set_intfdata (interface, NULL);
 675
 676         device_remove_file(odev->dev, &dev_attr_picture);
 677         device_remove_file(odev->dev, &dev_attr_enabled);
 678         device_unregister(odev->dev);
 679
 680         device_remove_file(&interface->dev, & ASUS_OLED_DEVICE_ATTR(picture));
 681         device_remove_file(&interface->dev, & ASUS_OLED_DEVICE_ATTR(enabled));
 682
 683         usb_put_dev(odev->udev);
 684
 685         if (odev->buf) kfree(odev->buf);
 686
 687         kfree(odev);
 688
 689         dev_info(&interface->dev, "Disconnected Asus OLED device\n");
 690 }
 691
 692 static struct usb_driver oled_driver = {
 693         .name =         ASUS_OLED_NAME,
 694         .probe =        asus_oled_probe,
 695         .disconnect =   asus_oled_disconnect,
 696         .id_table =     id_table,
 697 };
 698
 699 static ssize_t version_show(struct class *dev, char *buf)
 700 {
 701         return sprintf(buf, ASUS_OLED_UNDERSCORE_NAME " %s\n", ASUS_OLED_VERSION);
 702 }
 703
 704 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
 705
 706 static int __init asus_oled_init(void)
 707 {
 708         int retval = 0;
 709         oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
 710
 711         if (IS_ERR(oled_class)) {
 712                 err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
 713                 return PTR_ERR(oled_class);
 714         }
 715
 716         if ((retval = class_create_file(oled_class, &class_attr_version))) {
 717                 err("Error creating class version file");
 718                 goto error;
 719         }
 720
 721         retval = usb_register(&oled_driver);
 722
 723         if (retval) {
 724                 err("usb_register failed. Error number %d", retval);
 725                 goto error;
 726         }
 727
 728         return retval;
 729
 730 error:
 731         class_destroy(oled_class);
 732         return retval;
 733 }
 734
 735 static void __exit asus_oled_exit(void)
 736 {
 737         class_remove_file(oled_class, &class_attr_version);
 738         class_destroy(oled_class);
 739
 740         usb_deregister(&oled_driver);
 741 }
 742
 743 module_init (asus_oled_init);
 744 module_exit (asus_oled_exit);
 745