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;
  60 static int oled_num;
  61
  62 static uint start_off;
  63
  64 module_param(start_off, uint, 0644);
  65
  66 MODULE_PARM_DESC(start_off,
  67                  "Set to 1 to switch off OLED display after it is attached");
  68
  69 enum oled_pack_mode{
  70         PACK_MODE_G1,
  71         PACK_MODE_G50,
  72         PACK_MODE_LAST
  73 };
  74
  75 struct oled_dev_desc_str {
  76         uint16_t                idVendor;
  77         uint16_t                idProduct;
  78         /* width of display */
  79         uint16_t                devWidth;
  80         /* formula to be used while packing the picture */
  81         enum oled_pack_mode     packMode;
  82         const char              *devDesc;
  83 };
  84
  85 /* table of devices that work with this driver */
  86 static struct usb_device_id id_table[] = {
  87         /* Asus G1/G2 (and variants)*/
  88         { USB_DEVICE(0x0b05, 0x1726) },
  89         /* Asus G50V (and possibly others - G70? G71?)*/
  90         { USB_DEVICE(0x0b05, 0x175b) },
  91         { },
  92 };
  93
  94 /* parameters of specific devices */
  95 static struct oled_dev_desc_str oled_dev_desc_table[] = {
  96         { 0x0b05, 0x1726, 128, PACK_MODE_G1, "G1/G2" },
  97         { 0x0b05, 0x175b, 256, PACK_MODE_G50, "G50" },
  98         { },
  99 };
 100
 101 MODULE_DEVICE_TABLE(usb, id_table);
 102
 103 struct asus_oled_header {
 104         uint8_t         magic1;
 105         uint8_t         magic2;
 106         uint8_t         flags;
 107         uint8_t         value3;
 108         uint8_t         buffer1;
 109         uint8_t         buffer2;
 110         uint8_t         value6;
 111         uint8_t         value7;
 112         uint8_t         value8;
 113         uint8_t         padding2[7];
 114 } __attribute((packed));
 115
 116 struct asus_oled_packet {
 117         struct asus_oled_header         header;
 118         uint8_t                         bitmap[ASUS_OLED_PACKET_BUF_SIZE];
 119 } __attribute((packed));
 120
 121 struct asus_oled_dev {
 122         struct usb_device       *udev;
 123         uint8_t                 pic_mode;
 124         uint16_t                dev_width;
 125         enum oled_pack_mode     pack_mode;
 126         size_t                  height;
 127         size_t                  width;
 128         size_t                  x_shift;
 129         size_t                  y_shift;
 130         size_t                  buf_offs;
 131         uint8_t                 last_val;
 132         size_t                  buf_size;
 133         char                    *buf;
 134         uint8_t                 enabled;
 135         struct device           *dev;
 136 };
 137
 138 static void setup_packet_header(struct asus_oled_packet *packet, char flags,
 139                          char value3, char buffer1, char buffer2, char value6,
 140                          char value7, char value8)
 141 {
 142         memset(packet, 0, sizeof(struct asus_oled_header));
 143         packet->header.magic1 = 0x55;
 144         packet->header.magic2 = 0xaa;
 145         packet->header.flags = flags;
 146         packet->header.value3 = value3;
 147         packet->header.buffer1 = buffer1;
 148         packet->header.buffer2 = buffer2;
 149         packet->header.value6 = value6;
 150         packet->header.value7 = value7;
 151         packet->header.value8 = value8;
 152 }
 153
 154 static void enable_oled(struct asus_oled_dev *odev, uint8_t enabl)
 155 {
 156         int a;
 157         int retval;
 158         int act_len;
 159         struct asus_oled_packet *packet;
 160
 161         packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
 162
 163         if (!packet) {
 164                 dev_err(&odev->udev->dev, "out of memory\n");
 165                 return;
 166         }
 167
 168         setup_packet_header(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
 169
 170         if (enabl)
 171                 packet->bitmap[0] = 0xaf;
 172         else
 173                 packet->bitmap[0] = 0xae;
 174
 175         for (a = 0; a < 1; a++) {
 176                 retval = usb_bulk_msg(odev->udev,
 177                         usb_sndbulkpipe(odev->udev, 2),
 178                         packet,
 179                         sizeof(struct asus_oled_header) + 1,
 180                         &act_len,
 181                         -1);
 182
 183                 if (retval)
 184                         dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
 185         }
 186
 187         odev->enabled = enabl;
 188
 189         kfree(packet);
 190 }
 191
 192 static ssize_t set_enabled(struct device *dev, struct device_attribute *attr,
 193                            const char *buf, size_t count)
 194 {
 195         struct usb_interface *intf = to_usb_interface(dev);
 196         struct asus_oled_dev *odev = usb_get_intfdata(intf);
 197         unsigned long value;
 198         if (strict_strtoul(buf, 10, &value))
 199                 return -EINVAL;
 200
 201         enable_oled(odev, value);
 202
 203         return count;
 204 }
 205
 206 static ssize_t class_set_enabled(struct device *device,
 207                                  struct device_attribute *attr,
 208                                  const char *buf, size_t count)
 209 {
 210         struct asus_oled_dev *odev =
 211                 (struct asus_oled_dev *) dev_get_drvdata(device);
 212         unsigned long value;
 213
 214         if (strict_strtoul(buf, 10, &value))
 215                 return -EINVAL;
 216
 217         enable_oled(odev, value);
 218
 219         return count;
 220 }
 221
 222 static ssize_t get_enabled(struct device *dev, struct device_attribute *attr,
 223                            char *buf)
 224 {
 225         struct usb_interface *intf = to_usb_interface(dev);
 226         struct asus_oled_dev *odev = usb_get_intfdata(intf);
 227
 228         return sprintf(buf, "%d\n", odev->enabled);
 229 }
 230
 231 static ssize_t class_get_enabled(struct device *device,
 232                                  struct device_attribute *attr, char *buf)
 233 {
 234         struct asus_oled_dev *odev =
 235                 (struct asus_oled_dev *) dev_get_drvdata(device);
 236
 237         return sprintf(buf, "%d\n", odev->enabled);
 238 }
 239
 240 static void send_packets(struct usb_device *udev,
 241                          struct asus_oled_packet *packet,
 242                          char *buf, uint8_t p_type, size_t p_num)
 243 {
 244         size_t i;
 245         int act_len;
 246
 247         for (i = 0; i < p_num; i++) {
 248                 int retval;
 249
 250                 switch (p_type) {
 251                 case ASUS_OLED_ROLL:
 252                         setup_packet_header(packet, 0x40, 0x80, p_num,
 253                                             i + 1, 0x00, 0x01, 0xff);
 254                         break;
 255                 case ASUS_OLED_STATIC:
 256                         setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
 257                                             0x01, 0x00, 0x01, 0x00);
 258                         break;
 259                 case ASUS_OLED_FLASH:
 260                         setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
 261                                             0x01, 0x00, 0x00, 0xff);
 262                         break;
 263                 }
 264
 265                 memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i),
 266                        ASUS_OLED_PACKET_BUF_SIZE);
 267
 268                 retval = usb_bulk_msg(udev, usb_sndctrlpipe(udev, 2),
 269                                       packet, sizeof(struct asus_oled_packet),
 270                                       &act_len, -1);
 271
 272                 if (retval)
 273                         dev_dbg(&udev->dev, "retval = %d\n", retval);
 274         }
 275 }
 276
 277 static void send_packet(struct usb_device *udev,
 278                         struct asus_oled_packet *packet,
 279                         size_t offset, size_t len, char *buf, uint8_t b1,
 280                         uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5,
 281                         uint8_t b6) {
 282         int retval;
 283         int act_len;
 284
 285         setup_packet_header(packet, b1, b2, b3, b4, b5, b6, 0x00);
 286         memcpy(packet->bitmap, buf + offset, len);
 287
 288         retval = usb_bulk_msg(udev,
 289                               usb_sndctrlpipe(udev, 2),
 290                               packet,
 291                               sizeof(struct asus_oled_packet),
 292                               &act_len,
 293                               -1);
 294
 295         if (retval)
 296                 dev_dbg(&udev->dev, "retval = %d\n", retval);
 297 }
 298
 299
 300 static void send_packets_g50(struct usb_device *udev,
 301                              struct asus_oled_packet *packet, char *buf)
 302 {
 303         send_packet(udev, packet,     0, 0x100, buf,
 304                     0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
 305         send_packet(udev, packet, 0x100, 0x080, buf,
 306                     0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
 307
 308         send_packet(udev, packet, 0x180, 0x100, buf,
 309                     0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
 310         send_packet(udev, packet, 0x280, 0x100, buf,
 311                     0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
 312         send_packet(udev, packet, 0x380, 0x080, buf,
 313                     0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
 314 }
 315
 316
 317 static void send_data(struct asus_oled_dev *odev)
 318 {
 319         size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
 320         struct asus_oled_packet *packet;
 321
 322         packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
 323
 324         if (!packet) {
 325                 dev_err(&odev->udev->dev, "out of memory\n");
 326                 return;
 327         }
 328
 329         if (odev->pack_mode == PACK_MODE_G1) {
 330                 /* When sending roll-mode data the display updated only
 331                    first packet.  I have no idea why, but when static picture
 332                    is sent just before rolling picture everything works fine. */
 333                 if (odev->pic_mode == ASUS_OLED_ROLL)
 334                         send_packets(odev->udev, packet, odev->buf,
 335                                      ASUS_OLED_STATIC, 2);
 336
 337                 /* Only ROLL mode can use more than 2 packets.*/
 338                 if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
 339                         packet_num = 2;
 340
 341                 send_packets(odev->udev, packet, odev->buf,
 342                              odev->pic_mode, packet_num);
 343         } else if (odev->pack_mode == PACK_MODE_G50) {
 344                 send_packets_g50(odev->udev, packet, odev->buf);
 345         }
 346
 347         kfree(packet);
 348 }
 349
 350 static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
 351 {
 352         while (count-- > 0 && val) {
 353                 size_t x = odev->buf_offs % odev->width;
 354                 size_t y = odev->buf_offs / odev->width;
 355                 size_t i;
 356
 357                 x += odev->x_shift;
 358                 y += odev->y_shift;
 359
 360                 switch (odev->pack_mode) {
 361                 case PACK_MODE_G1:
 362                         /* i = (x/128)*640 + 127 - x + (y/8)*128;
 363                            This one for 128 is the same, but might be better
 364                            for different widths? */
 365                         i = (x/odev->dev_width)*640 +
 366                                 odev->dev_width - 1 - x +
 367                                 (y/8)*odev->dev_width;
 368                         break;
 369
 370                 case PACK_MODE_G50:
 371                         i =  (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
 372                         break;
 373
 374                 default:
 375                         i = 0;
 376                         printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n",
 377                                odev->pack_mode);
 378                         break;
 379                 }
 380
 381                 if (i >= odev->buf_size) {
 382                         printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug:"
 383                                "offs: %d >= %d i: %d (x: %d y: %d)\n",
 384                                (int) odev->buf_offs, (int) odev->buf_size,
 385                                (int) i, (int) x, (int) y);
 386                         return -EIO;
 387                 }
 388
 389                 switch (odev->pack_mode) {
 390                 case PACK_MODE_G1:
 391                         odev->buf[i] &= ~(1<<(y%8));
 392                         break;
 393
 394                 case PACK_MODE_G50:
 395                         odev->buf[i] &= ~(1<<(x%8));
 396                         break;
 397
 398                 default:
 399                         /* cannot get here; stops gcc complaining*/
 400                         ;
 401                 }
 402
 403                 odev->last_val = val;
 404                 odev->buf_offs++;
 405         }
 406
 407         return 0;
 408 }
 409
 410 static ssize_t odev_set_picture(struct asus_oled_dev *odev,
 411                                 const char *buf, size_t count)
 412 {
 413         size_t offs = 0, max_offs;
 414
 415         if (count < 1)
 416                 return 0;
 417
 418         if (tolower(buf[0]) == 'b') {
 419                 /* binary mode, set the entire memory*/
 420
 421                 size_t i;
 422
 423                 odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
 424
 425                 kfree(odev->buf);
 426                 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 427
 428                 memset(odev->buf, 0xff, odev->buf_size);
 429
 430                 for (i = 1; i < count && i <= 32 * 32; i++) {
 431                         odev->buf[i-1] = buf[i];
 432                         odev->buf_offs = i-1;
 433                 }
 434
 435                 odev->width = odev->dev_width / 8;
 436                 odev->height = ASUS_OLED_DISP_HEIGHT;
 437                 odev->x_shift = 0;
 438                 odev->y_shift = 0;
 439                 odev->last_val =  0;
 440
 441                 send_data(odev);
 442
 443                 return count;
 444         }
 445
 446         if (buf[0] == '<') {
 447                 size_t i;
 448                 size_t w = 0, h = 0;
 449                 size_t w_mem, h_mem;
 450
 451                 if (count < 10 || buf[2] != ':')
 452                         goto error_header;
 453
 454
 455                 switch (tolower(buf[1])) {
 456                 case ASUS_OLED_STATIC:
 457                 case ASUS_OLED_ROLL:
 458                 case ASUS_OLED_FLASH:
 459                         odev->pic_mode = buf[1];
 460                         break;
 461                 default:
 462                         printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n",
 463                                buf[1]);
 464                         return -EIO;
 465                         break;
 466                 }
 467
 468                 for (i = 3; i < count; ++i) {
 469                         if (buf[i] >= '0' && buf[i] <= '9') {
 470                                 w = 10*w + (buf[i] - '0');
 471
 472                                 if (w > ASUS_OLED_MAX_WIDTH)
 473                                         goto error_width;
 474                         } else if (tolower(buf[i]) == 'x') {
 475                                 break;
 476                         } else {
 477                                 goto error_width;
 478                         }
 479                 }
 480
 481                 for (++i; i < count; ++i) {
 482                         if (buf[i] >= '0' && buf[i] <= '9') {
 483                                 h = 10*h + (buf[i] - '0');
 484
 485                                 if (h > ASUS_OLED_DISP_HEIGHT)
 486                                         goto error_height;
 487                         } else if (tolower(buf[i]) == '>') {
 488                                 break;
 489                         } else {
 490                                 goto error_height;
 491                         }
 492                 }
 493
 494                 if (w < 1 || w > ASUS_OLED_MAX_WIDTH)
 495                         goto error_width;
 496
 497                 if (h < 1 || h > ASUS_OLED_DISP_HEIGHT)
 498                         goto error_height;
 499
 500                 if (i >= count || buf[i] != '>')
 501                         goto error_header;
 502
 503                 offs = i+1;
 504
 505                 if (w % (odev->dev_width) != 0)
 506                         w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
 507                 else
 508                         w_mem = w;
 509
 510                 if (h < ASUS_OLED_DISP_HEIGHT)
 511                         h_mem = ASUS_OLED_DISP_HEIGHT;
 512                 else
 513                         h_mem = h;
 514
 515                 odev->buf_size = w_mem * h_mem / 8;
 516
 517                 kfree(odev->buf);
 518                 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 519
 520                 if (odev->buf == NULL) {
 521                         odev->buf_size = 0;
 522                         printk(ASUS_OLED_ERROR "Out of memory!\n");
 523                         return -ENOMEM;
 524                 }
 525
 526                 memset(odev->buf, 0xff, odev->buf_size);
 527
 528                 odev->buf_offs = 0;
 529                 odev->width = w;
 530                 odev->height = h;
 531                 odev->x_shift = 0;
 532                 odev->y_shift = 0;
 533                 odev->last_val = 0;
 534
 535                 if (odev->pic_mode == ASUS_OLED_FLASH) {
 536                         if (h < ASUS_OLED_DISP_HEIGHT/2)
 537                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
 538                 } else {
 539                         if (h < ASUS_OLED_DISP_HEIGHT)
 540                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
 541                 }
 542
 543                 if (w < (odev->dev_width))
 544                         odev->x_shift = ((odev->dev_width) - w)/2;
 545         }
 546
 547         max_offs = odev->width * odev->height;
 548
 549         while (offs < count && odev->buf_offs < max_offs) {
 550                 int ret = 0;
 551
 552                 if (buf[offs] == '1' || buf[offs] == '#') {
 553                         ret = append_values(odev, 1, 1);
 554                         if (ret < 0)
 555                                 return ret;
 556                 } else if (buf[offs] == '0' || buf[offs] == ' ') {
 557                         ret = append_values(odev, 0, 1);
 558                         if (ret < 0)
 559                                 return ret;
 560                 } else if (buf[offs] == '\n') {
 561                         /* New line detected. Lets assume, that all characters
 562                            till the end of the line were equal to the last
 563                            character in this line.*/
 564                         if (odev->buf_offs % odev->width != 0)
 565                                 ret = append_values(odev, odev->last_val,
 566                                                     odev->width -
 567                                                     (odev->buf_offs %
 568                                                      odev->width));
 569                         if (ret < 0)
 570                                 return ret;
 571                 }
 572
 573                 offs++;
 574         }
 575
 576         if (odev->buf_offs >= max_offs)
 577                 send_data(odev);
 578
 579         return count;
 580
 581 error_width:
 582         printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
 583         return -EIO;
 584
 585 error_height:
 586         printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
 587         return -EIO;
 588
 589 error_header:
 590         printk(ASUS_OLED_ERROR "Wrong picture header.\n");
 591         return -EIO;
 592 }
 593
 594 static ssize_t set_picture(struct device *dev, struct device_attribute *attr,
 595                            const char *buf, size_t count)
 596 {
 597         struct usb_interface *intf = to_usb_interface(dev);
 598
 599         return odev_set_picture(usb_get_intfdata(intf), buf, count);
 600 }
 601
 602 static ssize_t class_set_picture(struct device *device,
 603                                  struct device_attribute *attr,
 604                                  const char *buf, size_t count)
 605 {
 606         return odev_set_picture((struct asus_oled_dev *)
 607                                 dev_get_drvdata(device), buf, count);
 608 }
 609
 610 #define ASUS_OLED_DEVICE_ATTR(_file)            dev_attr_asus_oled_##_file
 611
 612 static DEVICE_ATTR(asus_oled_enabled, S_IWUGO | S_IRUGO,
 613                    get_enabled, set_enabled);
 614 static DEVICE_ATTR(asus_oled_picture, S_IWUGO , NULL, set_picture);
 615
 616 static DEVICE_ATTR(enabled, S_IWUGO | S_IRUGO,
 617                    class_get_enabled, class_set_enabled);
 618 static DEVICE_ATTR(picture, S_IWUGO, NULL, class_set_picture);
 619
 620 static int asus_oled_probe(struct usb_interface *interface,
 621                            const struct usb_device_id *id)
 622 {
 623         struct usb_device *udev = interface_to_usbdev(interface);
 624         struct asus_oled_dev *odev = NULL;
 625         int retval = -ENOMEM;
 626         uint16_t dev_width = 0;
 627         enum oled_pack_mode pack_mode = PACK_MODE_LAST;
 628         const struct oled_dev_desc_str *dev_desc = oled_dev_desc_table;
 629         const char *desc = NULL;
 630
 631         if (!id) {
 632                 /* Even possible? Just to make sure...*/
 633                 dev_err(&interface->dev, "No usb_device_id provided!\n");
 634                 return -ENODEV;
 635         }
 636
 637         for (; dev_desc->idVendor; dev_desc++) {
 638                 if (dev_desc->idVendor == id->idVendor
 639                     && dev_desc->idProduct == id->idProduct) {
 640                         dev_width = dev_desc->devWidth;
 641                         desc = dev_desc->devDesc;
 642                         pack_mode = dev_desc->packMode;
 643                         break;
 644                 }
 645         }
 646
 647         if (!desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
 648                 dev_err(&interface->dev,
 649                         "Missing or incomplete device description!\n");
 650                 return -ENODEV;
 651         }
 652
 653         odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
 654
 655         if (odev == NULL) {
 656                 dev_err(&interface->dev, "Out of memory\n");
 657                 return -ENOMEM;
 658         }
 659
 660         odev->udev = usb_get_dev(udev);
 661         odev->pic_mode = ASUS_OLED_STATIC;
 662         odev->dev_width = dev_width;
 663         odev->pack_mode = pack_mode;
 664         odev->height = 0;
 665         odev->width = 0;
 666         odev->x_shift = 0;
 667         odev->y_shift = 0;
 668         odev->buf_offs = 0;
 669         odev->buf_size = 0;
 670         odev->last_val = 0;
 671         odev->buf = NULL;
 672         odev->enabled = 1;
 673         odev->dev = NULL;
 674
 675         usb_set_intfdata(interface, odev);
 676
 677         retval = device_create_file(&interface->dev,
 678                                     &ASUS_OLED_DEVICE_ATTR(enabled));
 679         if (retval)
 680                 goto err_files;
 681
 682         retval = device_create_file(&interface->dev,
 683                                     &ASUS_OLED_DEVICE_ATTR(picture));
 684         if (retval)
 685                 goto err_files;
 686
 687         odev->dev = device_create(oled_class, &interface->dev, MKDEV(0, 0),
 688                                   NULL, "oled_%d", ++oled_num);
 689
 690         if (IS_ERR(odev->dev)) {
 691                 retval = PTR_ERR(odev->dev);
 692                 goto err_files;
 693         }
 694
 695         dev_set_drvdata(odev->dev, odev);
 696
 697         retval = device_create_file(odev->dev, &dev_attr_enabled);
 698         if (retval)
 699                 goto err_class_enabled;
 700
 701         retval = device_create_file(odev->dev, &dev_attr_picture);
 702         if (retval)
 703                 goto err_class_picture;
 704
 705         dev_info(&interface->dev,
 706                  "Attached Asus OLED device: %s [width %u, pack_mode %d]\n",
 707                  desc, odev->dev_width, odev->pack_mode);
 708
 709         if (start_off)
 710                 enable_oled(odev, 0);
 711
 712         return 0;
 713
 714 err_class_picture:
 715         device_remove_file(odev->dev, &dev_attr_picture);
 716
 717 err_class_enabled:
 718         device_remove_file(odev->dev, &dev_attr_enabled);
 719         device_unregister(odev->dev);
 720
 721 err_files:
 722         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
 723         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
 724
 725         usb_set_intfdata(interface, NULL);
 726         usb_put_dev(odev->udev);
 727         kfree(odev);
 728
 729         return retval;
 730 }
 731
 732 static void asus_oled_disconnect(struct usb_interface *interface)
 733 {
 734         struct asus_oled_dev *odev;
 735
 736         odev = usb_get_intfdata(interface);
 737         usb_set_intfdata(interface, NULL);
 738
 739         device_remove_file(odev->dev, &dev_attr_picture);
 740         device_remove_file(odev->dev, &dev_attr_enabled);
 741         device_unregister(odev->dev);
 742
 743         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
 744         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
 745
 746         usb_put_dev(odev->udev);
 747
 748         kfree(odev->buf);
 749
 750         kfree(odev);
 751
 752         dev_info(&interface->dev, "Disconnected Asus OLED device\n");
 753 }
 754
 755 static struct usb_driver oled_driver = {
 756         .name =         ASUS_OLED_NAME,
 757         .probe =        asus_oled_probe,
 758         .disconnect =   asus_oled_disconnect,
 759         .id_table =     id_table,
 760 };
 761
 762 static ssize_t version_show(struct class *dev, char *buf)
 763 {
 764         return sprintf(buf, ASUS_OLED_UNDERSCORE_NAME " %s\n",
 765                        ASUS_OLED_VERSION);
 766 }
 767
 768 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
 769
 770 static int __init asus_oled_init(void)
 771 {
 772         int retval = 0;
 773         oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
 774
 775         if (IS_ERR(oled_class)) {
 776                 err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
 777                 return PTR_ERR(oled_class);
 778         }
 779
 780         retval = class_create_file(oled_class, &class_attr_version);
 781         if (retval) {
 782                 err("Error creating class version file");
 783                 goto error;
 784         }
 785
 786         retval = usb_register(&oled_driver);
 787
 788         if (retval) {
 789                 err("usb_register failed. Error number %d", retval);
 790                 goto error;
 791         }
 792
 793         return retval;
 794
 795 error:
 796         class_destroy(oled_class);
 797         return retval;
 798 }
 799
 800 static void __exit asus_oled_exit(void)
 801 {
 802         class_remove_file(oled_class, &class_attr_version);
 803         class_destroy(oled_class);
 804
 805         usb_deregister(&oled_driver);
 806 }
 807
 808 module_init(asus_oled_init);
 809 module_exit(asus_oled_exit);
 810