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